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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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575e7c1417
This stops "CMP r/m, reg" to write back the data into memory. Pointed out by Avi. The writeback suppression now covers CMP, CMPS, SCAS. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>
4298 lines
111 KiB
C
4298 lines
111 KiB
C
/******************************************************************************
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* emulate.c
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*
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* Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
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*
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* Copyright (c) 2005 Keir Fraser
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*
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* Linux coding style, mod r/m decoder, segment base fixes, real-mode
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* privileged instructions:
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*
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* Copyright (C) 2006 Qumranet
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* Copyright 2010 Red Hat, Inc. and/or its affiliates.
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*
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* Avi Kivity <avi@qumranet.com>
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* Yaniv Kamay <yaniv@qumranet.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
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*/
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#include <linux/kvm_host.h>
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#include "kvm_cache_regs.h"
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#include <linux/module.h>
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#include <asm/kvm_emulate.h>
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#include "x86.h"
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#include "tss.h"
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/*
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* Opcode effective-address decode tables.
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* Note that we only emulate instructions that have at least one memory
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* operand (excluding implicit stack references). We assume that stack
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* references and instruction fetches will never occur in special memory
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* areas that require emulation. So, for example, 'mov <imm>,<reg>' need
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* not be handled.
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*/
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/* Operand sizes: 8-bit operands or specified/overridden size. */
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#define ByteOp (1<<0) /* 8-bit operands. */
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/* Destination operand type. */
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#define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */
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#define DstReg (2<<1) /* Register operand. */
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#define DstMem (3<<1) /* Memory operand. */
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#define DstAcc (4<<1) /* Destination Accumulator */
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#define DstDI (5<<1) /* Destination is in ES:(E)DI */
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#define DstMem64 (6<<1) /* 64bit memory operand */
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#define DstImmUByte (7<<1) /* 8-bit unsigned immediate operand */
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#define DstMask (7<<1)
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/* Source operand type. */
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#define SrcNone (0<<4) /* No source operand. */
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#define SrcReg (1<<4) /* Register operand. */
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#define SrcMem (2<<4) /* Memory operand. */
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#define SrcMem16 (3<<4) /* Memory operand (16-bit). */
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#define SrcMem32 (4<<4) /* Memory operand (32-bit). */
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#define SrcImm (5<<4) /* Immediate operand. */
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#define SrcImmByte (6<<4) /* 8-bit sign-extended immediate operand. */
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#define SrcOne (7<<4) /* Implied '1' */
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#define SrcImmUByte (8<<4) /* 8-bit unsigned immediate operand. */
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#define SrcImmU (9<<4) /* Immediate operand, unsigned */
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#define SrcSI (0xa<<4) /* Source is in the DS:RSI */
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#define SrcImmFAddr (0xb<<4) /* Source is immediate far address */
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#define SrcMemFAddr (0xc<<4) /* Source is far address in memory */
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#define SrcAcc (0xd<<4) /* Source Accumulator */
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#define SrcImmU16 (0xe<<4) /* Immediate operand, unsigned, 16 bits */
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#define SrcMask (0xf<<4)
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/* Generic ModRM decode. */
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#define ModRM (1<<8)
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/* Destination is only written; never read. */
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#define Mov (1<<9)
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#define BitOp (1<<10)
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#define MemAbs (1<<11) /* Memory operand is absolute displacement */
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#define String (1<<12) /* String instruction (rep capable) */
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#define Stack (1<<13) /* Stack instruction (push/pop) */
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#define Group (1<<14) /* Bits 3:5 of modrm byte extend opcode */
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#define GroupDual (1<<15) /* Alternate decoding of mod == 3 */
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#define Prefix (1<<16) /* Instruction varies with 66/f2/f3 prefix */
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#define Sse (1<<17) /* SSE Vector instruction */
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#define RMExt (1<<18) /* Opcode extension in ModRM r/m if mod == 3 */
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/* Misc flags */
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#define Prot (1<<21) /* instruction generates #UD if not in prot-mode */
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#define VendorSpecific (1<<22) /* Vendor specific instruction */
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#define NoAccess (1<<23) /* Don't access memory (lea/invlpg/verr etc) */
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#define Op3264 (1<<24) /* Operand is 64b in long mode, 32b otherwise */
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#define Undefined (1<<25) /* No Such Instruction */
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#define Lock (1<<26) /* lock prefix is allowed for the instruction */
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#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
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#define No64 (1<<28)
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/* Source 2 operand type */
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#define Src2None (0<<29)
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#define Src2CL (1<<29)
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#define Src2ImmByte (2<<29)
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#define Src2One (3<<29)
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#define Src2Imm (4<<29)
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#define Src2Mask (7<<29)
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#define X2(x...) x, x
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#define X3(x...) X2(x), x
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#define X4(x...) X2(x), X2(x)
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#define X5(x...) X4(x), x
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#define X6(x...) X4(x), X2(x)
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#define X7(x...) X4(x), X3(x)
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#define X8(x...) X4(x), X4(x)
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#define X16(x...) X8(x), X8(x)
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struct opcode {
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u32 flags;
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u8 intercept;
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union {
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int (*execute)(struct x86_emulate_ctxt *ctxt);
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struct opcode *group;
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struct group_dual *gdual;
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struct gprefix *gprefix;
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} u;
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int (*check_perm)(struct x86_emulate_ctxt *ctxt);
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};
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struct group_dual {
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struct opcode mod012[8];
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struct opcode mod3[8];
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};
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struct gprefix {
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struct opcode pfx_no;
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struct opcode pfx_66;
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struct opcode pfx_f2;
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struct opcode pfx_f3;
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};
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/* EFLAGS bit definitions. */
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#define EFLG_ID (1<<21)
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#define EFLG_VIP (1<<20)
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#define EFLG_VIF (1<<19)
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#define EFLG_AC (1<<18)
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#define EFLG_VM (1<<17)
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#define EFLG_RF (1<<16)
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#define EFLG_IOPL (3<<12)
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#define EFLG_NT (1<<14)
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#define EFLG_OF (1<<11)
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#define EFLG_DF (1<<10)
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#define EFLG_IF (1<<9)
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#define EFLG_TF (1<<8)
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#define EFLG_SF (1<<7)
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#define EFLG_ZF (1<<6)
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#define EFLG_AF (1<<4)
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#define EFLG_PF (1<<2)
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#define EFLG_CF (1<<0)
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#define EFLG_RESERVED_ZEROS_MASK 0xffc0802a
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#define EFLG_RESERVED_ONE_MASK 2
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/*
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* Instruction emulation:
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* Most instructions are emulated directly via a fragment of inline assembly
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* code. This allows us to save/restore EFLAGS and thus very easily pick up
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* any modified flags.
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*/
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#if defined(CONFIG_X86_64)
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#define _LO32 "k" /* force 32-bit operand */
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#define _STK "%%rsp" /* stack pointer */
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#elif defined(__i386__)
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#define _LO32 "" /* force 32-bit operand */
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#define _STK "%%esp" /* stack pointer */
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#endif
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/*
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* These EFLAGS bits are restored from saved value during emulation, and
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* any changes are written back to the saved value after emulation.
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*/
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#define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF)
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/* Before executing instruction: restore necessary bits in EFLAGS. */
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#define _PRE_EFLAGS(_sav, _msk, _tmp) \
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/* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); _sav &= ~_msk; */ \
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"movl %"_sav",%"_LO32 _tmp"; " \
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"push %"_tmp"; " \
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"push %"_tmp"; " \
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"movl %"_msk",%"_LO32 _tmp"; " \
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"andl %"_LO32 _tmp",("_STK"); " \
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"pushf; " \
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"notl %"_LO32 _tmp"; " \
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"andl %"_LO32 _tmp",("_STK"); " \
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"andl %"_LO32 _tmp","__stringify(BITS_PER_LONG/4)"("_STK"); " \
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"pop %"_tmp"; " \
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"orl %"_LO32 _tmp",("_STK"); " \
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"popf; " \
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"pop %"_sav"; "
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/* After executing instruction: write-back necessary bits in EFLAGS. */
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#define _POST_EFLAGS(_sav, _msk, _tmp) \
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/* _sav |= EFLAGS & _msk; */ \
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"pushf; " \
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"pop %"_tmp"; " \
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"andl %"_msk",%"_LO32 _tmp"; " \
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"orl %"_LO32 _tmp",%"_sav"; "
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#ifdef CONFIG_X86_64
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#define ON64(x) x
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#else
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#define ON64(x)
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#endif
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#define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix, _dsttype) \
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do { \
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__asm__ __volatile__ ( \
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_PRE_EFLAGS("0", "4", "2") \
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_op _suffix " %"_x"3,%1; " \
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_POST_EFLAGS("0", "4", "2") \
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: "=m" (_eflags), "+q" (*(_dsttype*)&(_dst).val),\
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"=&r" (_tmp) \
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: _y ((_src).val), "i" (EFLAGS_MASK)); \
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} while (0)
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/* Raw emulation: instruction has two explicit operands. */
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#define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \
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do { \
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unsigned long _tmp; \
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\
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switch ((_dst).bytes) { \
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case 2: \
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____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w",u16);\
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break; \
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case 4: \
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____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l",u32);\
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break; \
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case 8: \
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ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q",u64)); \
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break; \
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} \
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} while (0)
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#define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \
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do { \
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unsigned long _tmp; \
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switch ((_dst).bytes) { \
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case 1: \
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____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b",u8); \
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break; \
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default: \
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__emulate_2op_nobyte(_op, _src, _dst, _eflags, \
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_wx, _wy, _lx, _ly, _qx, _qy); \
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break; \
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} \
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} while (0)
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/* Source operand is byte-sized and may be restricted to just %cl. */
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#define emulate_2op_SrcB(_op, _src, _dst, _eflags) \
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__emulate_2op(_op, _src, _dst, _eflags, \
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"b", "c", "b", "c", "b", "c", "b", "c")
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/* Source operand is byte, word, long or quad sized. */
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#define emulate_2op_SrcV(_op, _src, _dst, _eflags) \
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__emulate_2op(_op, _src, _dst, _eflags, \
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"b", "q", "w", "r", _LO32, "r", "", "r")
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/* Source operand is word, long or quad sized. */
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#define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \
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__emulate_2op_nobyte(_op, _src, _dst, _eflags, \
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"w", "r", _LO32, "r", "", "r")
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/* Instruction has three operands and one operand is stored in ECX register */
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#define __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, _suffix, _type) \
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do { \
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unsigned long _tmp; \
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_type _clv = (_cl).val; \
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_type _srcv = (_src).val; \
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_type _dstv = (_dst).val; \
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\
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__asm__ __volatile__ ( \
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_PRE_EFLAGS("0", "5", "2") \
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_op _suffix " %4,%1 \n" \
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_POST_EFLAGS("0", "5", "2") \
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: "=m" (_eflags), "+r" (_dstv), "=&r" (_tmp) \
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: "c" (_clv) , "r" (_srcv), "i" (EFLAGS_MASK) \
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); \
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\
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(_cl).val = (unsigned long) _clv; \
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(_src).val = (unsigned long) _srcv; \
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(_dst).val = (unsigned long) _dstv; \
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} while (0)
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#define emulate_2op_cl(_op, _cl, _src, _dst, _eflags) \
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do { \
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switch ((_dst).bytes) { \
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case 2: \
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__emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
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"w", unsigned short); \
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break; \
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case 4: \
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__emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
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"l", unsigned int); \
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break; \
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case 8: \
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ON64(__emulate_2op_cl(_op, _cl, _src, _dst, _eflags, \
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"q", unsigned long)); \
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break; \
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} \
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} while (0)
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#define __emulate_1op(_op, _dst, _eflags, _suffix) \
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do { \
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unsigned long _tmp; \
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\
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__asm__ __volatile__ ( \
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_PRE_EFLAGS("0", "3", "2") \
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_op _suffix " %1; " \
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_POST_EFLAGS("0", "3", "2") \
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: "=m" (_eflags), "+m" ((_dst).val), \
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"=&r" (_tmp) \
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: "i" (EFLAGS_MASK)); \
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} while (0)
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/* Instruction has only one explicit operand (no source operand). */
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#define emulate_1op(_op, _dst, _eflags) \
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do { \
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switch ((_dst).bytes) { \
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case 1: __emulate_1op(_op, _dst, _eflags, "b"); break; \
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case 2: __emulate_1op(_op, _dst, _eflags, "w"); break; \
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case 4: __emulate_1op(_op, _dst, _eflags, "l"); break; \
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case 8: ON64(__emulate_1op(_op, _dst, _eflags, "q")); break; \
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} \
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} while (0)
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#define __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, _suffix) \
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do { \
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unsigned long _tmp; \
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\
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__asm__ __volatile__ ( \
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_PRE_EFLAGS("0", "4", "1") \
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_op _suffix " %5; " \
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_POST_EFLAGS("0", "4", "1") \
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: "=m" (_eflags), "=&r" (_tmp), \
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"+a" (_rax), "+d" (_rdx) \
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: "i" (EFLAGS_MASK), "m" ((_src).val), \
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"a" (_rax), "d" (_rdx)); \
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} while (0)
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#define __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _suffix, _ex) \
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do { \
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unsigned long _tmp; \
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\
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__asm__ __volatile__ ( \
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_PRE_EFLAGS("0", "5", "1") \
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"1: \n\t" \
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_op _suffix " %6; " \
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"2: \n\t" \
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_POST_EFLAGS("0", "5", "1") \
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".pushsection .fixup,\"ax\" \n\t" \
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"3: movb $1, %4 \n\t" \
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"jmp 2b \n\t" \
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".popsection \n\t" \
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_ASM_EXTABLE(1b, 3b) \
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: "=m" (_eflags), "=&r" (_tmp), \
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"+a" (_rax), "+d" (_rdx), "+qm"(_ex) \
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: "i" (EFLAGS_MASK), "m" ((_src).val), \
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"a" (_rax), "d" (_rdx)); \
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} while (0)
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/* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */
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#define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags) \
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do { \
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switch((_src).bytes) { \
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case 1: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "b"); break; \
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case 2: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "w"); break; \
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case 4: __emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "l"); break; \
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case 8: ON64(__emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags, "q")); break; \
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} \
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} while (0)
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#define emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _ex) \
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do { \
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switch((_src).bytes) { \
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case 1: \
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__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
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_eflags, "b", _ex); \
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break; \
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case 2: \
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__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
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_eflags, "w", _ex); \
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break; \
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case 4: \
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__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
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_eflags, "l", _ex); \
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break; \
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case 8: ON64( \
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__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \
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_eflags, "q", _ex)); \
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break; \
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} \
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} while (0)
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/* Fetch next part of the instruction being emulated. */
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#define insn_fetch(_type, _size, _eip) \
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({ unsigned long _x; \
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rc = do_insn_fetch(ctxt, ops, (_eip), &_x, (_size)); \
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if (rc != X86EMUL_CONTINUE) \
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goto done; \
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(_eip) += (_size); \
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(_type)_x; \
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})
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#define insn_fetch_arr(_arr, _size, _eip) \
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({ rc = do_insn_fetch(ctxt, ops, (_eip), _arr, (_size)); \
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if (rc != X86EMUL_CONTINUE) \
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goto done; \
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(_eip) += (_size); \
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})
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|
|
|
static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
|
|
enum x86_intercept intercept,
|
|
enum x86_intercept_stage stage)
|
|
{
|
|
struct x86_instruction_info info = {
|
|
.intercept = intercept,
|
|
.rep_prefix = ctxt->decode.rep_prefix,
|
|
.modrm_mod = ctxt->decode.modrm_mod,
|
|
.modrm_reg = ctxt->decode.modrm_reg,
|
|
.modrm_rm = ctxt->decode.modrm_rm,
|
|
.src_val = ctxt->decode.src.val64,
|
|
.src_bytes = ctxt->decode.src.bytes,
|
|
.dst_bytes = ctxt->decode.dst.bytes,
|
|
.ad_bytes = ctxt->decode.ad_bytes,
|
|
.next_rip = ctxt->eip,
|
|
};
|
|
|
|
return ctxt->ops->intercept(ctxt->vcpu, &info, stage);
|
|
}
|
|
|
|
static inline unsigned long ad_mask(struct decode_cache *c)
|
|
{
|
|
return (1UL << (c->ad_bytes << 3)) - 1;
|
|
}
|
|
|
|
/* Access/update address held in a register, based on addressing mode. */
|
|
static inline unsigned long
|
|
address_mask(struct decode_cache *c, unsigned long reg)
|
|
{
|
|
if (c->ad_bytes == sizeof(unsigned long))
|
|
return reg;
|
|
else
|
|
return reg & ad_mask(c);
|
|
}
|
|
|
|
static inline unsigned long
|
|
register_address(struct decode_cache *c, unsigned long reg)
|
|
{
|
|
return address_mask(c, reg);
|
|
}
|
|
|
|
static inline void
|
|
register_address_increment(struct decode_cache *c, unsigned long *reg, int inc)
|
|
{
|
|
if (c->ad_bytes == sizeof(unsigned long))
|
|
*reg += inc;
|
|
else
|
|
*reg = (*reg & ~ad_mask(c)) | ((*reg + inc) & ad_mask(c));
|
|
}
|
|
|
|
static inline void jmp_rel(struct decode_cache *c, int rel)
|
|
{
|
|
register_address_increment(c, &c->eip, rel);
|
|
}
|
|
|
|
static u32 desc_limit_scaled(struct desc_struct *desc)
|
|
{
|
|
u32 limit = get_desc_limit(desc);
|
|
|
|
return desc->g ? (limit << 12) | 0xfff : limit;
|
|
}
|
|
|
|
static void set_seg_override(struct decode_cache *c, int seg)
|
|
{
|
|
c->has_seg_override = true;
|
|
c->seg_override = seg;
|
|
}
|
|
|
|
static unsigned long seg_base(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops, int seg)
|
|
{
|
|
if (ctxt->mode == X86EMUL_MODE_PROT64 && seg < VCPU_SREG_FS)
|
|
return 0;
|
|
|
|
return ops->get_cached_segment_base(seg, ctxt->vcpu);
|
|
}
|
|
|
|
static unsigned seg_override(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct decode_cache *c)
|
|
{
|
|
if (!c->has_seg_override)
|
|
return 0;
|
|
|
|
return c->seg_override;
|
|
}
|
|
|
|
static int emulate_exception(struct x86_emulate_ctxt *ctxt, int vec,
|
|
u32 error, bool valid)
|
|
{
|
|
ctxt->exception.vector = vec;
|
|
ctxt->exception.error_code = error;
|
|
ctxt->exception.error_code_valid = valid;
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
}
|
|
|
|
static int emulate_db(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
return emulate_exception(ctxt, DB_VECTOR, 0, false);
|
|
}
|
|
|
|
static int emulate_gp(struct x86_emulate_ctxt *ctxt, int err)
|
|
{
|
|
return emulate_exception(ctxt, GP_VECTOR, err, true);
|
|
}
|
|
|
|
static int emulate_ss(struct x86_emulate_ctxt *ctxt, int err)
|
|
{
|
|
return emulate_exception(ctxt, SS_VECTOR, err, true);
|
|
}
|
|
|
|
static int emulate_ud(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
return emulate_exception(ctxt, UD_VECTOR, 0, false);
|
|
}
|
|
|
|
static int emulate_ts(struct x86_emulate_ctxt *ctxt, int err)
|
|
{
|
|
return emulate_exception(ctxt, TS_VECTOR, err, true);
|
|
}
|
|
|
|
static int emulate_de(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
return emulate_exception(ctxt, DE_VECTOR, 0, false);
|
|
}
|
|
|
|
static int emulate_nm(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
return emulate_exception(ctxt, NM_VECTOR, 0, false);
|
|
}
|
|
|
|
static int linearize(struct x86_emulate_ctxt *ctxt,
|
|
struct segmented_address addr,
|
|
unsigned size, bool write,
|
|
ulong *linear)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
struct desc_struct desc;
|
|
bool usable;
|
|
ulong la;
|
|
u32 lim;
|
|
unsigned cpl, rpl;
|
|
|
|
la = seg_base(ctxt, ctxt->ops, addr.seg) + addr.ea;
|
|
switch (ctxt->mode) {
|
|
case X86EMUL_MODE_REAL:
|
|
break;
|
|
case X86EMUL_MODE_PROT64:
|
|
if (((signed long)la << 16) >> 16 != la)
|
|
return emulate_gp(ctxt, 0);
|
|
break;
|
|
default:
|
|
usable = ctxt->ops->get_cached_descriptor(&desc, NULL, addr.seg,
|
|
ctxt->vcpu);
|
|
if (!usable)
|
|
goto bad;
|
|
/* code segment or read-only data segment */
|
|
if (((desc.type & 8) || !(desc.type & 2)) && write)
|
|
goto bad;
|
|
/* unreadable code segment */
|
|
if ((desc.type & 8) && !(desc.type & 2))
|
|
goto bad;
|
|
lim = desc_limit_scaled(&desc);
|
|
if ((desc.type & 8) || !(desc.type & 4)) {
|
|
/* expand-up segment */
|
|
if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
|
|
goto bad;
|
|
} else {
|
|
/* exapand-down segment */
|
|
if (addr.ea <= lim || (u32)(addr.ea + size - 1) <= lim)
|
|
goto bad;
|
|
lim = desc.d ? 0xffffffff : 0xffff;
|
|
if (addr.ea > lim || (u32)(addr.ea + size - 1) > lim)
|
|
goto bad;
|
|
}
|
|
cpl = ctxt->ops->cpl(ctxt->vcpu);
|
|
rpl = ctxt->ops->get_segment_selector(addr.seg, ctxt->vcpu) & 3;
|
|
cpl = max(cpl, rpl);
|
|
if (!(desc.type & 8)) {
|
|
/* data segment */
|
|
if (cpl > desc.dpl)
|
|
goto bad;
|
|
} else if ((desc.type & 8) && !(desc.type & 4)) {
|
|
/* nonconforming code segment */
|
|
if (cpl != desc.dpl)
|
|
goto bad;
|
|
} else if ((desc.type & 8) && (desc.type & 4)) {
|
|
/* conforming code segment */
|
|
if (cpl < desc.dpl)
|
|
goto bad;
|
|
}
|
|
break;
|
|
}
|
|
if (c->ad_bytes != 8)
|
|
la &= (u32)-1;
|
|
*linear = la;
|
|
return X86EMUL_CONTINUE;
|
|
bad:
|
|
if (addr.seg == VCPU_SREG_SS)
|
|
return emulate_ss(ctxt, addr.seg);
|
|
else
|
|
return emulate_gp(ctxt, addr.seg);
|
|
}
|
|
|
|
static int segmented_read_std(struct x86_emulate_ctxt *ctxt,
|
|
struct segmented_address addr,
|
|
void *data,
|
|
unsigned size)
|
|
{
|
|
int rc;
|
|
ulong linear;
|
|
|
|
rc = linearize(ctxt, addr, size, false, &linear);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
return ctxt->ops->read_std(linear, data, size, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
}
|
|
|
|
static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
unsigned long eip, u8 *dest)
|
|
{
|
|
struct fetch_cache *fc = &ctxt->decode.fetch;
|
|
int rc;
|
|
int size, cur_size;
|
|
|
|
if (eip == fc->end) {
|
|
cur_size = fc->end - fc->start;
|
|
size = min(15UL - cur_size, PAGE_SIZE - offset_in_page(eip));
|
|
rc = ops->fetch(ctxt->cs_base + eip, fc->data + cur_size,
|
|
size, ctxt->vcpu, &ctxt->exception);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
fc->end += size;
|
|
}
|
|
*dest = fc->data[eip - fc->start];
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int do_insn_fetch(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
unsigned long eip, void *dest, unsigned size)
|
|
{
|
|
int rc;
|
|
|
|
/* x86 instructions are limited to 15 bytes. */
|
|
if (eip + size - ctxt->eip > 15)
|
|
return X86EMUL_UNHANDLEABLE;
|
|
while (size--) {
|
|
rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
}
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
/*
|
|
* Given the 'reg' portion of a ModRM byte, and a register block, return a
|
|
* pointer into the block that addresses the relevant register.
|
|
* @highbyte_regs specifies whether to decode AH,CH,DH,BH.
|
|
*/
|
|
static void *decode_register(u8 modrm_reg, unsigned long *regs,
|
|
int highbyte_regs)
|
|
{
|
|
void *p;
|
|
|
|
p = ®s[modrm_reg];
|
|
if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8)
|
|
p = (unsigned char *)®s[modrm_reg & 3] + 1;
|
|
return p;
|
|
}
|
|
|
|
static int read_descriptor(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct segmented_address addr,
|
|
u16 *size, unsigned long *address, int op_bytes)
|
|
{
|
|
int rc;
|
|
|
|
if (op_bytes == 2)
|
|
op_bytes = 3;
|
|
*address = 0;
|
|
rc = segmented_read_std(ctxt, addr, size, 2);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
addr.ea += 2;
|
|
rc = segmented_read_std(ctxt, addr, address, op_bytes);
|
|
return rc;
|
|
}
|
|
|
|
static int test_cc(unsigned int condition, unsigned int flags)
|
|
{
|
|
int rc = 0;
|
|
|
|
switch ((condition & 15) >> 1) {
|
|
case 0: /* o */
|
|
rc |= (flags & EFLG_OF);
|
|
break;
|
|
case 1: /* b/c/nae */
|
|
rc |= (flags & EFLG_CF);
|
|
break;
|
|
case 2: /* z/e */
|
|
rc |= (flags & EFLG_ZF);
|
|
break;
|
|
case 3: /* be/na */
|
|
rc |= (flags & (EFLG_CF|EFLG_ZF));
|
|
break;
|
|
case 4: /* s */
|
|
rc |= (flags & EFLG_SF);
|
|
break;
|
|
case 5: /* p/pe */
|
|
rc |= (flags & EFLG_PF);
|
|
break;
|
|
case 7: /* le/ng */
|
|
rc |= (flags & EFLG_ZF);
|
|
/* fall through */
|
|
case 6: /* l/nge */
|
|
rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF));
|
|
break;
|
|
}
|
|
|
|
/* Odd condition identifiers (lsb == 1) have inverted sense. */
|
|
return (!!rc ^ (condition & 1));
|
|
}
|
|
|
|
static void fetch_register_operand(struct operand *op)
|
|
{
|
|
switch (op->bytes) {
|
|
case 1:
|
|
op->val = *(u8 *)op->addr.reg;
|
|
break;
|
|
case 2:
|
|
op->val = *(u16 *)op->addr.reg;
|
|
break;
|
|
case 4:
|
|
op->val = *(u32 *)op->addr.reg;
|
|
break;
|
|
case 8:
|
|
op->val = *(u64 *)op->addr.reg;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void read_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data, int reg)
|
|
{
|
|
ctxt->ops->get_fpu(ctxt);
|
|
switch (reg) {
|
|
case 0: asm("movdqu %%xmm0, %0" : "=m"(*data)); break;
|
|
case 1: asm("movdqu %%xmm1, %0" : "=m"(*data)); break;
|
|
case 2: asm("movdqu %%xmm2, %0" : "=m"(*data)); break;
|
|
case 3: asm("movdqu %%xmm3, %0" : "=m"(*data)); break;
|
|
case 4: asm("movdqu %%xmm4, %0" : "=m"(*data)); break;
|
|
case 5: asm("movdqu %%xmm5, %0" : "=m"(*data)); break;
|
|
case 6: asm("movdqu %%xmm6, %0" : "=m"(*data)); break;
|
|
case 7: asm("movdqu %%xmm7, %0" : "=m"(*data)); break;
|
|
#ifdef CONFIG_X86_64
|
|
case 8: asm("movdqu %%xmm8, %0" : "=m"(*data)); break;
|
|
case 9: asm("movdqu %%xmm9, %0" : "=m"(*data)); break;
|
|
case 10: asm("movdqu %%xmm10, %0" : "=m"(*data)); break;
|
|
case 11: asm("movdqu %%xmm11, %0" : "=m"(*data)); break;
|
|
case 12: asm("movdqu %%xmm12, %0" : "=m"(*data)); break;
|
|
case 13: asm("movdqu %%xmm13, %0" : "=m"(*data)); break;
|
|
case 14: asm("movdqu %%xmm14, %0" : "=m"(*data)); break;
|
|
case 15: asm("movdqu %%xmm15, %0" : "=m"(*data)); break;
|
|
#endif
|
|
default: BUG();
|
|
}
|
|
ctxt->ops->put_fpu(ctxt);
|
|
}
|
|
|
|
static void write_sse_reg(struct x86_emulate_ctxt *ctxt, sse128_t *data,
|
|
int reg)
|
|
{
|
|
ctxt->ops->get_fpu(ctxt);
|
|
switch (reg) {
|
|
case 0: asm("movdqu %0, %%xmm0" : : "m"(*data)); break;
|
|
case 1: asm("movdqu %0, %%xmm1" : : "m"(*data)); break;
|
|
case 2: asm("movdqu %0, %%xmm2" : : "m"(*data)); break;
|
|
case 3: asm("movdqu %0, %%xmm3" : : "m"(*data)); break;
|
|
case 4: asm("movdqu %0, %%xmm4" : : "m"(*data)); break;
|
|
case 5: asm("movdqu %0, %%xmm5" : : "m"(*data)); break;
|
|
case 6: asm("movdqu %0, %%xmm6" : : "m"(*data)); break;
|
|
case 7: asm("movdqu %0, %%xmm7" : : "m"(*data)); break;
|
|
#ifdef CONFIG_X86_64
|
|
case 8: asm("movdqu %0, %%xmm8" : : "m"(*data)); break;
|
|
case 9: asm("movdqu %0, %%xmm9" : : "m"(*data)); break;
|
|
case 10: asm("movdqu %0, %%xmm10" : : "m"(*data)); break;
|
|
case 11: asm("movdqu %0, %%xmm11" : : "m"(*data)); break;
|
|
case 12: asm("movdqu %0, %%xmm12" : : "m"(*data)); break;
|
|
case 13: asm("movdqu %0, %%xmm13" : : "m"(*data)); break;
|
|
case 14: asm("movdqu %0, %%xmm14" : : "m"(*data)); break;
|
|
case 15: asm("movdqu %0, %%xmm15" : : "m"(*data)); break;
|
|
#endif
|
|
default: BUG();
|
|
}
|
|
ctxt->ops->put_fpu(ctxt);
|
|
}
|
|
|
|
static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
|
|
struct operand *op,
|
|
struct decode_cache *c,
|
|
int inhibit_bytereg)
|
|
{
|
|
unsigned reg = c->modrm_reg;
|
|
int highbyte_regs = c->rex_prefix == 0;
|
|
|
|
if (!(c->d & ModRM))
|
|
reg = (c->b & 7) | ((c->rex_prefix & 1) << 3);
|
|
|
|
if (c->d & Sse) {
|
|
op->type = OP_XMM;
|
|
op->bytes = 16;
|
|
op->addr.xmm = reg;
|
|
read_sse_reg(ctxt, &op->vec_val, reg);
|
|
return;
|
|
}
|
|
|
|
op->type = OP_REG;
|
|
if ((c->d & ByteOp) && !inhibit_bytereg) {
|
|
op->addr.reg = decode_register(reg, c->regs, highbyte_regs);
|
|
op->bytes = 1;
|
|
} else {
|
|
op->addr.reg = decode_register(reg, c->regs, 0);
|
|
op->bytes = c->op_bytes;
|
|
}
|
|
fetch_register_operand(op);
|
|
op->orig_val = op->val;
|
|
}
|
|
|
|
static int decode_modrm(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct operand *op)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
u8 sib;
|
|
int index_reg = 0, base_reg = 0, scale;
|
|
int rc = X86EMUL_CONTINUE;
|
|
ulong modrm_ea = 0;
|
|
|
|
if (c->rex_prefix) {
|
|
c->modrm_reg = (c->rex_prefix & 4) << 1; /* REX.R */
|
|
index_reg = (c->rex_prefix & 2) << 2; /* REX.X */
|
|
c->modrm_rm = base_reg = (c->rex_prefix & 1) << 3; /* REG.B */
|
|
}
|
|
|
|
c->modrm = insn_fetch(u8, 1, c->eip);
|
|
c->modrm_mod |= (c->modrm & 0xc0) >> 6;
|
|
c->modrm_reg |= (c->modrm & 0x38) >> 3;
|
|
c->modrm_rm |= (c->modrm & 0x07);
|
|
c->modrm_seg = VCPU_SREG_DS;
|
|
|
|
if (c->modrm_mod == 3) {
|
|
op->type = OP_REG;
|
|
op->bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
|
|
op->addr.reg = decode_register(c->modrm_rm,
|
|
c->regs, c->d & ByteOp);
|
|
if (c->d & Sse) {
|
|
op->type = OP_XMM;
|
|
op->bytes = 16;
|
|
op->addr.xmm = c->modrm_rm;
|
|
read_sse_reg(ctxt, &op->vec_val, c->modrm_rm);
|
|
return rc;
|
|
}
|
|
fetch_register_operand(op);
|
|
return rc;
|
|
}
|
|
|
|
op->type = OP_MEM;
|
|
|
|
if (c->ad_bytes == 2) {
|
|
unsigned bx = c->regs[VCPU_REGS_RBX];
|
|
unsigned bp = c->regs[VCPU_REGS_RBP];
|
|
unsigned si = c->regs[VCPU_REGS_RSI];
|
|
unsigned di = c->regs[VCPU_REGS_RDI];
|
|
|
|
/* 16-bit ModR/M decode. */
|
|
switch (c->modrm_mod) {
|
|
case 0:
|
|
if (c->modrm_rm == 6)
|
|
modrm_ea += insn_fetch(u16, 2, c->eip);
|
|
break;
|
|
case 1:
|
|
modrm_ea += insn_fetch(s8, 1, c->eip);
|
|
break;
|
|
case 2:
|
|
modrm_ea += insn_fetch(u16, 2, c->eip);
|
|
break;
|
|
}
|
|
switch (c->modrm_rm) {
|
|
case 0:
|
|
modrm_ea += bx + si;
|
|
break;
|
|
case 1:
|
|
modrm_ea += bx + di;
|
|
break;
|
|
case 2:
|
|
modrm_ea += bp + si;
|
|
break;
|
|
case 3:
|
|
modrm_ea += bp + di;
|
|
break;
|
|
case 4:
|
|
modrm_ea += si;
|
|
break;
|
|
case 5:
|
|
modrm_ea += di;
|
|
break;
|
|
case 6:
|
|
if (c->modrm_mod != 0)
|
|
modrm_ea += bp;
|
|
break;
|
|
case 7:
|
|
modrm_ea += bx;
|
|
break;
|
|
}
|
|
if (c->modrm_rm == 2 || c->modrm_rm == 3 ||
|
|
(c->modrm_rm == 6 && c->modrm_mod != 0))
|
|
c->modrm_seg = VCPU_SREG_SS;
|
|
modrm_ea = (u16)modrm_ea;
|
|
} else {
|
|
/* 32/64-bit ModR/M decode. */
|
|
if ((c->modrm_rm & 7) == 4) {
|
|
sib = insn_fetch(u8, 1, c->eip);
|
|
index_reg |= (sib >> 3) & 7;
|
|
base_reg |= sib & 7;
|
|
scale = sib >> 6;
|
|
|
|
if ((base_reg & 7) == 5 && c->modrm_mod == 0)
|
|
modrm_ea += insn_fetch(s32, 4, c->eip);
|
|
else
|
|
modrm_ea += c->regs[base_reg];
|
|
if (index_reg != 4)
|
|
modrm_ea += c->regs[index_reg] << scale;
|
|
} else if ((c->modrm_rm & 7) == 5 && c->modrm_mod == 0) {
|
|
if (ctxt->mode == X86EMUL_MODE_PROT64)
|
|
c->rip_relative = 1;
|
|
} else
|
|
modrm_ea += c->regs[c->modrm_rm];
|
|
switch (c->modrm_mod) {
|
|
case 0:
|
|
if (c->modrm_rm == 5)
|
|
modrm_ea += insn_fetch(s32, 4, c->eip);
|
|
break;
|
|
case 1:
|
|
modrm_ea += insn_fetch(s8, 1, c->eip);
|
|
break;
|
|
case 2:
|
|
modrm_ea += insn_fetch(s32, 4, c->eip);
|
|
break;
|
|
}
|
|
}
|
|
op->addr.mem.ea = modrm_ea;
|
|
done:
|
|
return rc;
|
|
}
|
|
|
|
static int decode_abs(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct operand *op)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc = X86EMUL_CONTINUE;
|
|
|
|
op->type = OP_MEM;
|
|
switch (c->ad_bytes) {
|
|
case 2:
|
|
op->addr.mem.ea = insn_fetch(u16, 2, c->eip);
|
|
break;
|
|
case 4:
|
|
op->addr.mem.ea = insn_fetch(u32, 4, c->eip);
|
|
break;
|
|
case 8:
|
|
op->addr.mem.ea = insn_fetch(u64, 8, c->eip);
|
|
break;
|
|
}
|
|
done:
|
|
return rc;
|
|
}
|
|
|
|
static void fetch_bit_operand(struct decode_cache *c)
|
|
{
|
|
long sv = 0, mask;
|
|
|
|
if (c->dst.type == OP_MEM && c->src.type == OP_REG) {
|
|
mask = ~(c->dst.bytes * 8 - 1);
|
|
|
|
if (c->src.bytes == 2)
|
|
sv = (s16)c->src.val & (s16)mask;
|
|
else if (c->src.bytes == 4)
|
|
sv = (s32)c->src.val & (s32)mask;
|
|
|
|
c->dst.addr.mem.ea += (sv >> 3);
|
|
}
|
|
|
|
/* only subword offset */
|
|
c->src.val &= (c->dst.bytes << 3) - 1;
|
|
}
|
|
|
|
static int read_emulated(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
unsigned long addr, void *dest, unsigned size)
|
|
{
|
|
int rc;
|
|
struct read_cache *mc = &ctxt->decode.mem_read;
|
|
|
|
while (size) {
|
|
int n = min(size, 8u);
|
|
size -= n;
|
|
if (mc->pos < mc->end)
|
|
goto read_cached;
|
|
|
|
rc = ops->read_emulated(addr, mc->data + mc->end, n,
|
|
&ctxt->exception, ctxt->vcpu);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
mc->end += n;
|
|
|
|
read_cached:
|
|
memcpy(dest, mc->data + mc->pos, n);
|
|
mc->pos += n;
|
|
dest += n;
|
|
addr += n;
|
|
}
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int segmented_read(struct x86_emulate_ctxt *ctxt,
|
|
struct segmented_address addr,
|
|
void *data,
|
|
unsigned size)
|
|
{
|
|
int rc;
|
|
ulong linear;
|
|
|
|
rc = linearize(ctxt, addr, size, false, &linear);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
return read_emulated(ctxt, ctxt->ops, linear, data, size);
|
|
}
|
|
|
|
static int segmented_write(struct x86_emulate_ctxt *ctxt,
|
|
struct segmented_address addr,
|
|
const void *data,
|
|
unsigned size)
|
|
{
|
|
int rc;
|
|
ulong linear;
|
|
|
|
rc = linearize(ctxt, addr, size, true, &linear);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
return ctxt->ops->write_emulated(linear, data, size,
|
|
&ctxt->exception, ctxt->vcpu);
|
|
}
|
|
|
|
static int segmented_cmpxchg(struct x86_emulate_ctxt *ctxt,
|
|
struct segmented_address addr,
|
|
const void *orig_data, const void *data,
|
|
unsigned size)
|
|
{
|
|
int rc;
|
|
ulong linear;
|
|
|
|
rc = linearize(ctxt, addr, size, true, &linear);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
return ctxt->ops->cmpxchg_emulated(linear, orig_data, data,
|
|
size, &ctxt->exception, ctxt->vcpu);
|
|
}
|
|
|
|
static int pio_in_emulated(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
unsigned int size, unsigned short port,
|
|
void *dest)
|
|
{
|
|
struct read_cache *rc = &ctxt->decode.io_read;
|
|
|
|
if (rc->pos == rc->end) { /* refill pio read ahead */
|
|
struct decode_cache *c = &ctxt->decode;
|
|
unsigned int in_page, n;
|
|
unsigned int count = c->rep_prefix ?
|
|
address_mask(c, c->regs[VCPU_REGS_RCX]) : 1;
|
|
in_page = (ctxt->eflags & EFLG_DF) ?
|
|
offset_in_page(c->regs[VCPU_REGS_RDI]) :
|
|
PAGE_SIZE - offset_in_page(c->regs[VCPU_REGS_RDI]);
|
|
n = min(min(in_page, (unsigned int)sizeof(rc->data)) / size,
|
|
count);
|
|
if (n == 0)
|
|
n = 1;
|
|
rc->pos = rc->end = 0;
|
|
if (!ops->pio_in_emulated(size, port, rc->data, n, ctxt->vcpu))
|
|
return 0;
|
|
rc->end = n * size;
|
|
}
|
|
|
|
memcpy(dest, rc->data + rc->pos, size);
|
|
rc->pos += size;
|
|
return 1;
|
|
}
|
|
|
|
static void get_descriptor_table_ptr(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 selector, struct desc_ptr *dt)
|
|
{
|
|
if (selector & 1 << 2) {
|
|
struct desc_struct desc;
|
|
memset (dt, 0, sizeof *dt);
|
|
if (!ops->get_cached_descriptor(&desc, NULL, VCPU_SREG_LDTR,
|
|
ctxt->vcpu))
|
|
return;
|
|
|
|
dt->size = desc_limit_scaled(&desc); /* what if limit > 65535? */
|
|
dt->address = get_desc_base(&desc);
|
|
} else
|
|
ops->get_gdt(dt, ctxt->vcpu);
|
|
}
|
|
|
|
/* allowed just for 8 bytes segments */
|
|
static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 selector, struct desc_struct *desc)
|
|
{
|
|
struct desc_ptr dt;
|
|
u16 index = selector >> 3;
|
|
int ret;
|
|
ulong addr;
|
|
|
|
get_descriptor_table_ptr(ctxt, ops, selector, &dt);
|
|
|
|
if (dt.size < index * 8 + 7)
|
|
return emulate_gp(ctxt, selector & 0xfffc);
|
|
addr = dt.address + index * 8;
|
|
ret = ops->read_std(addr, desc, sizeof *desc, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* allowed just for 8 bytes segments */
|
|
static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 selector, struct desc_struct *desc)
|
|
{
|
|
struct desc_ptr dt;
|
|
u16 index = selector >> 3;
|
|
ulong addr;
|
|
int ret;
|
|
|
|
get_descriptor_table_ptr(ctxt, ops, selector, &dt);
|
|
|
|
if (dt.size < index * 8 + 7)
|
|
return emulate_gp(ctxt, selector & 0xfffc);
|
|
|
|
addr = dt.address + index * 8;
|
|
ret = ops->write_std(addr, desc, sizeof *desc, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Does not support long mode */
|
|
static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 selector, int seg)
|
|
{
|
|
struct desc_struct seg_desc;
|
|
u8 dpl, rpl, cpl;
|
|
unsigned err_vec = GP_VECTOR;
|
|
u32 err_code = 0;
|
|
bool null_selector = !(selector & ~0x3); /* 0000-0003 are null */
|
|
int ret;
|
|
|
|
memset(&seg_desc, 0, sizeof seg_desc);
|
|
|
|
if ((seg <= VCPU_SREG_GS && ctxt->mode == X86EMUL_MODE_VM86)
|
|
|| ctxt->mode == X86EMUL_MODE_REAL) {
|
|
/* set real mode segment descriptor */
|
|
set_desc_base(&seg_desc, selector << 4);
|
|
set_desc_limit(&seg_desc, 0xffff);
|
|
seg_desc.type = 3;
|
|
seg_desc.p = 1;
|
|
seg_desc.s = 1;
|
|
goto load;
|
|
}
|
|
|
|
/* NULL selector is not valid for TR, CS and SS */
|
|
if ((seg == VCPU_SREG_CS || seg == VCPU_SREG_SS || seg == VCPU_SREG_TR)
|
|
&& null_selector)
|
|
goto exception;
|
|
|
|
/* TR should be in GDT only */
|
|
if (seg == VCPU_SREG_TR && (selector & (1 << 2)))
|
|
goto exception;
|
|
|
|
if (null_selector) /* for NULL selector skip all following checks */
|
|
goto load;
|
|
|
|
ret = read_segment_descriptor(ctxt, ops, selector, &seg_desc);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
|
|
err_code = selector & 0xfffc;
|
|
err_vec = GP_VECTOR;
|
|
|
|
/* can't load system descriptor into segment selecor */
|
|
if (seg <= VCPU_SREG_GS && !seg_desc.s)
|
|
goto exception;
|
|
|
|
if (!seg_desc.p) {
|
|
err_vec = (seg == VCPU_SREG_SS) ? SS_VECTOR : NP_VECTOR;
|
|
goto exception;
|
|
}
|
|
|
|
rpl = selector & 3;
|
|
dpl = seg_desc.dpl;
|
|
cpl = ops->cpl(ctxt->vcpu);
|
|
|
|
switch (seg) {
|
|
case VCPU_SREG_SS:
|
|
/*
|
|
* segment is not a writable data segment or segment
|
|
* selector's RPL != CPL or segment selector's RPL != CPL
|
|
*/
|
|
if (rpl != cpl || (seg_desc.type & 0xa) != 0x2 || dpl != cpl)
|
|
goto exception;
|
|
break;
|
|
case VCPU_SREG_CS:
|
|
if (!(seg_desc.type & 8))
|
|
goto exception;
|
|
|
|
if (seg_desc.type & 4) {
|
|
/* conforming */
|
|
if (dpl > cpl)
|
|
goto exception;
|
|
} else {
|
|
/* nonconforming */
|
|
if (rpl > cpl || dpl != cpl)
|
|
goto exception;
|
|
}
|
|
/* CS(RPL) <- CPL */
|
|
selector = (selector & 0xfffc) | cpl;
|
|
break;
|
|
case VCPU_SREG_TR:
|
|
if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9))
|
|
goto exception;
|
|
break;
|
|
case VCPU_SREG_LDTR:
|
|
if (seg_desc.s || seg_desc.type != 2)
|
|
goto exception;
|
|
break;
|
|
default: /* DS, ES, FS, or GS */
|
|
/*
|
|
* segment is not a data or readable code segment or
|
|
* ((segment is a data or nonconforming code segment)
|
|
* and (both RPL and CPL > DPL))
|
|
*/
|
|
if ((seg_desc.type & 0xa) == 0x8 ||
|
|
(((seg_desc.type & 0xc) != 0xc) &&
|
|
(rpl > dpl && cpl > dpl)))
|
|
goto exception;
|
|
break;
|
|
}
|
|
|
|
if (seg_desc.s) {
|
|
/* mark segment as accessed */
|
|
seg_desc.type |= 1;
|
|
ret = write_segment_descriptor(ctxt, ops, selector, &seg_desc);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
}
|
|
load:
|
|
ops->set_segment_selector(selector, seg, ctxt->vcpu);
|
|
ops->set_cached_descriptor(&seg_desc, 0, seg, ctxt->vcpu);
|
|
return X86EMUL_CONTINUE;
|
|
exception:
|
|
emulate_exception(ctxt, err_vec, err_code, true);
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
}
|
|
|
|
static void write_register_operand(struct operand *op)
|
|
{
|
|
/* The 4-byte case *is* correct: in 64-bit mode we zero-extend. */
|
|
switch (op->bytes) {
|
|
case 1:
|
|
*(u8 *)op->addr.reg = (u8)op->val;
|
|
break;
|
|
case 2:
|
|
*(u16 *)op->addr.reg = (u16)op->val;
|
|
break;
|
|
case 4:
|
|
*op->addr.reg = (u32)op->val;
|
|
break; /* 64b: zero-extend */
|
|
case 8:
|
|
*op->addr.reg = op->val;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline int writeback(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
int rc;
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
switch (c->dst.type) {
|
|
case OP_REG:
|
|
write_register_operand(&c->dst);
|
|
break;
|
|
case OP_MEM:
|
|
if (c->lock_prefix)
|
|
rc = segmented_cmpxchg(ctxt,
|
|
c->dst.addr.mem,
|
|
&c->dst.orig_val,
|
|
&c->dst.val,
|
|
c->dst.bytes);
|
|
else
|
|
rc = segmented_write(ctxt,
|
|
c->dst.addr.mem,
|
|
&c->dst.val,
|
|
c->dst.bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
break;
|
|
case OP_XMM:
|
|
write_sse_reg(ctxt, &c->dst.vec_val, c->dst.addr.xmm);
|
|
break;
|
|
case OP_NONE:
|
|
/* no writeback */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static inline void emulate_push(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
c->dst.type = OP_MEM;
|
|
c->dst.bytes = c->op_bytes;
|
|
c->dst.val = c->src.val;
|
|
register_address_increment(c, &c->regs[VCPU_REGS_RSP], -c->op_bytes);
|
|
c->dst.addr.mem.ea = register_address(c, c->regs[VCPU_REGS_RSP]);
|
|
c->dst.addr.mem.seg = VCPU_SREG_SS;
|
|
}
|
|
|
|
static int emulate_pop(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
void *dest, int len)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc;
|
|
struct segmented_address addr;
|
|
|
|
addr.ea = register_address(c, c->regs[VCPU_REGS_RSP]);
|
|
addr.seg = VCPU_SREG_SS;
|
|
rc = segmented_read(ctxt, addr, dest, len);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
register_address_increment(c, &c->regs[VCPU_REGS_RSP], len);
|
|
return rc;
|
|
}
|
|
|
|
static int emulate_popf(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
void *dest, int len)
|
|
{
|
|
int rc;
|
|
unsigned long val, change_mask;
|
|
int iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
|
|
int cpl = ops->cpl(ctxt->vcpu);
|
|
|
|
rc = emulate_pop(ctxt, ops, &val, len);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
change_mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_OF
|
|
| EFLG_TF | EFLG_DF | EFLG_NT | EFLG_RF | EFLG_AC | EFLG_ID;
|
|
|
|
switch(ctxt->mode) {
|
|
case X86EMUL_MODE_PROT64:
|
|
case X86EMUL_MODE_PROT32:
|
|
case X86EMUL_MODE_PROT16:
|
|
if (cpl == 0)
|
|
change_mask |= EFLG_IOPL;
|
|
if (cpl <= iopl)
|
|
change_mask |= EFLG_IF;
|
|
break;
|
|
case X86EMUL_MODE_VM86:
|
|
if (iopl < 3)
|
|
return emulate_gp(ctxt, 0);
|
|
change_mask |= EFLG_IF;
|
|
break;
|
|
default: /* real mode */
|
|
change_mask |= (EFLG_IOPL | EFLG_IF);
|
|
break;
|
|
}
|
|
|
|
*(unsigned long *)dest =
|
|
(ctxt->eflags & ~change_mask) | (val & change_mask);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void emulate_push_sreg(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops, int seg)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
c->src.val = ops->get_segment_selector(seg, ctxt->vcpu);
|
|
|
|
emulate_push(ctxt, ops);
|
|
}
|
|
|
|
static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops, int seg)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
unsigned long selector;
|
|
int rc;
|
|
|
|
rc = emulate_pop(ctxt, ops, &selector, c->op_bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
rc = load_segment_descriptor(ctxt, ops, (u16)selector, seg);
|
|
return rc;
|
|
}
|
|
|
|
static int emulate_pusha(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
unsigned long old_esp = c->regs[VCPU_REGS_RSP];
|
|
int rc = X86EMUL_CONTINUE;
|
|
int reg = VCPU_REGS_RAX;
|
|
|
|
while (reg <= VCPU_REGS_RDI) {
|
|
(reg == VCPU_REGS_RSP) ?
|
|
(c->src.val = old_esp) : (c->src.val = c->regs[reg]);
|
|
|
|
emulate_push(ctxt, ops);
|
|
|
|
rc = writeback(ctxt, ops);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
++reg;
|
|
}
|
|
|
|
/* Disable writeback. */
|
|
c->dst.type = OP_NONE;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int emulate_popa(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc = X86EMUL_CONTINUE;
|
|
int reg = VCPU_REGS_RDI;
|
|
|
|
while (reg >= VCPU_REGS_RAX) {
|
|
if (reg == VCPU_REGS_RSP) {
|
|
register_address_increment(c, &c->regs[VCPU_REGS_RSP],
|
|
c->op_bytes);
|
|
--reg;
|
|
}
|
|
|
|
rc = emulate_pop(ctxt, ops, &c->regs[reg], c->op_bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
break;
|
|
--reg;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int emulate_int_real(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops, int irq)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc;
|
|
struct desc_ptr dt;
|
|
gva_t cs_addr;
|
|
gva_t eip_addr;
|
|
u16 cs, eip;
|
|
|
|
/* TODO: Add limit checks */
|
|
c->src.val = ctxt->eflags;
|
|
emulate_push(ctxt, ops);
|
|
rc = writeback(ctxt, ops);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
|
|
|
|
c->src.val = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
|
|
emulate_push(ctxt, ops);
|
|
rc = writeback(ctxt, ops);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
c->src.val = c->eip;
|
|
emulate_push(ctxt, ops);
|
|
rc = writeback(ctxt, ops);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
c->dst.type = OP_NONE;
|
|
|
|
ops->get_idt(&dt, ctxt->vcpu);
|
|
|
|
eip_addr = dt.address + (irq << 2);
|
|
cs_addr = dt.address + (irq << 2) + 2;
|
|
|
|
rc = ops->read_std(cs_addr, &cs, 2, ctxt->vcpu, &ctxt->exception);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
rc = ops->read_std(eip_addr, &eip, 2, ctxt->vcpu, &ctxt->exception);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
rc = load_segment_descriptor(ctxt, ops, cs, VCPU_SREG_CS);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
c->eip = eip;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int emulate_int(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops, int irq)
|
|
{
|
|
switch(ctxt->mode) {
|
|
case X86EMUL_MODE_REAL:
|
|
return emulate_int_real(ctxt, ops, irq);
|
|
case X86EMUL_MODE_VM86:
|
|
case X86EMUL_MODE_PROT16:
|
|
case X86EMUL_MODE_PROT32:
|
|
case X86EMUL_MODE_PROT64:
|
|
default:
|
|
/* Protected mode interrupts unimplemented yet */
|
|
return X86EMUL_UNHANDLEABLE;
|
|
}
|
|
}
|
|
|
|
static int emulate_iret_real(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc = X86EMUL_CONTINUE;
|
|
unsigned long temp_eip = 0;
|
|
unsigned long temp_eflags = 0;
|
|
unsigned long cs = 0;
|
|
unsigned long mask = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF | EFLG_TF |
|
|
EFLG_IF | EFLG_DF | EFLG_OF | EFLG_IOPL | EFLG_NT | EFLG_RF |
|
|
EFLG_AC | EFLG_ID | (1 << 1); /* Last one is the reserved bit */
|
|
unsigned long vm86_mask = EFLG_VM | EFLG_VIF | EFLG_VIP;
|
|
|
|
/* TODO: Add stack limit check */
|
|
|
|
rc = emulate_pop(ctxt, ops, &temp_eip, c->op_bytes);
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
if (temp_eip & ~0xffff)
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
rc = emulate_pop(ctxt, ops, &cs, c->op_bytes);
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
rc = emulate_pop(ctxt, ops, &temp_eflags, c->op_bytes);
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
rc = load_segment_descriptor(ctxt, ops, (u16)cs, VCPU_SREG_CS);
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
c->eip = temp_eip;
|
|
|
|
|
|
if (c->op_bytes == 4)
|
|
ctxt->eflags = ((temp_eflags & mask) | (ctxt->eflags & vm86_mask));
|
|
else if (c->op_bytes == 2) {
|
|
ctxt->eflags &= ~0xffff;
|
|
ctxt->eflags |= temp_eflags;
|
|
}
|
|
|
|
ctxt->eflags &= ~EFLG_RESERVED_ZEROS_MASK; /* Clear reserved zeros */
|
|
ctxt->eflags |= EFLG_RESERVED_ONE_MASK;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static inline int emulate_iret(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops* ops)
|
|
{
|
|
switch(ctxt->mode) {
|
|
case X86EMUL_MODE_REAL:
|
|
return emulate_iret_real(ctxt, ops);
|
|
case X86EMUL_MODE_VM86:
|
|
case X86EMUL_MODE_PROT16:
|
|
case X86EMUL_MODE_PROT32:
|
|
case X86EMUL_MODE_PROT64:
|
|
default:
|
|
/* iret from protected mode unimplemented yet */
|
|
return X86EMUL_UNHANDLEABLE;
|
|
}
|
|
}
|
|
|
|
static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
return emulate_pop(ctxt, ops, &c->dst.val, c->dst.bytes);
|
|
}
|
|
|
|
static inline void emulate_grp2(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
switch (c->modrm_reg) {
|
|
case 0: /* rol */
|
|
emulate_2op_SrcB("rol", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 1: /* ror */
|
|
emulate_2op_SrcB("ror", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 2: /* rcl */
|
|
emulate_2op_SrcB("rcl", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 3: /* rcr */
|
|
emulate_2op_SrcB("rcr", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 4: /* sal/shl */
|
|
case 6: /* sal/shl */
|
|
emulate_2op_SrcB("sal", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 5: /* shr */
|
|
emulate_2op_SrcB("shr", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 7: /* sar */
|
|
emulate_2op_SrcB("sar", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
unsigned long *rax = &c->regs[VCPU_REGS_RAX];
|
|
unsigned long *rdx = &c->regs[VCPU_REGS_RDX];
|
|
u8 de = 0;
|
|
|
|
switch (c->modrm_reg) {
|
|
case 0 ... 1: /* test */
|
|
emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 2: /* not */
|
|
c->dst.val = ~c->dst.val;
|
|
break;
|
|
case 3: /* neg */
|
|
emulate_1op("neg", c->dst, ctxt->eflags);
|
|
break;
|
|
case 4: /* mul */
|
|
emulate_1op_rax_rdx("mul", c->src, *rax, *rdx, ctxt->eflags);
|
|
break;
|
|
case 5: /* imul */
|
|
emulate_1op_rax_rdx("imul", c->src, *rax, *rdx, ctxt->eflags);
|
|
break;
|
|
case 6: /* div */
|
|
emulate_1op_rax_rdx_ex("div", c->src, *rax, *rdx,
|
|
ctxt->eflags, de);
|
|
break;
|
|
case 7: /* idiv */
|
|
emulate_1op_rax_rdx_ex("idiv", c->src, *rax, *rdx,
|
|
ctxt->eflags, de);
|
|
break;
|
|
default:
|
|
return X86EMUL_UNHANDLEABLE;
|
|
}
|
|
if (de)
|
|
return emulate_de(ctxt);
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
switch (c->modrm_reg) {
|
|
case 0: /* inc */
|
|
emulate_1op("inc", c->dst, ctxt->eflags);
|
|
break;
|
|
case 1: /* dec */
|
|
emulate_1op("dec", c->dst, ctxt->eflags);
|
|
break;
|
|
case 2: /* call near abs */ {
|
|
long int old_eip;
|
|
old_eip = c->eip;
|
|
c->eip = c->src.val;
|
|
c->src.val = old_eip;
|
|
emulate_push(ctxt, ops);
|
|
break;
|
|
}
|
|
case 4: /* jmp abs */
|
|
c->eip = c->src.val;
|
|
break;
|
|
case 6: /* push */
|
|
emulate_push(ctxt, ops);
|
|
break;
|
|
}
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
u64 old = c->dst.orig_val64;
|
|
|
|
if (((u32) (old >> 0) != (u32) c->regs[VCPU_REGS_RAX]) ||
|
|
((u32) (old >> 32) != (u32) c->regs[VCPU_REGS_RDX])) {
|
|
c->regs[VCPU_REGS_RAX] = (u32) (old >> 0);
|
|
c->regs[VCPU_REGS_RDX] = (u32) (old >> 32);
|
|
ctxt->eflags &= ~EFLG_ZF;
|
|
} else {
|
|
c->dst.val64 = ((u64)c->regs[VCPU_REGS_RCX] << 32) |
|
|
(u32) c->regs[VCPU_REGS_RBX];
|
|
|
|
ctxt->eflags |= EFLG_ZF;
|
|
}
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int emulate_ret_far(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc;
|
|
unsigned long cs;
|
|
|
|
rc = emulate_pop(ctxt, ops, &c->eip, c->op_bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
if (c->op_bytes == 4)
|
|
c->eip = (u32)c->eip;
|
|
rc = emulate_pop(ctxt, ops, &cs, c->op_bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
rc = load_segment_descriptor(ctxt, ops, (u16)cs, VCPU_SREG_CS);
|
|
return rc;
|
|
}
|
|
|
|
static int emulate_load_segment(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops, int seg)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
unsigned short sel;
|
|
int rc;
|
|
|
|
memcpy(&sel, c->src.valptr + c->op_bytes, 2);
|
|
|
|
rc = load_segment_descriptor(ctxt, ops, sel, seg);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
c->dst.val = c->src.val;
|
|
return rc;
|
|
}
|
|
|
|
static inline void
|
|
setup_syscalls_segments(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops, struct desc_struct *cs,
|
|
struct desc_struct *ss)
|
|
{
|
|
memset(cs, 0, sizeof(struct desc_struct));
|
|
ops->get_cached_descriptor(cs, NULL, VCPU_SREG_CS, ctxt->vcpu);
|
|
memset(ss, 0, sizeof(struct desc_struct));
|
|
|
|
cs->l = 0; /* will be adjusted later */
|
|
set_desc_base(cs, 0); /* flat segment */
|
|
cs->g = 1; /* 4kb granularity */
|
|
set_desc_limit(cs, 0xfffff); /* 4GB limit */
|
|
cs->type = 0x0b; /* Read, Execute, Accessed */
|
|
cs->s = 1;
|
|
cs->dpl = 0; /* will be adjusted later */
|
|
cs->p = 1;
|
|
cs->d = 1;
|
|
|
|
set_desc_base(ss, 0); /* flat segment */
|
|
set_desc_limit(ss, 0xfffff); /* 4GB limit */
|
|
ss->g = 1; /* 4kb granularity */
|
|
ss->s = 1;
|
|
ss->type = 0x03; /* Read/Write, Accessed */
|
|
ss->d = 1; /* 32bit stack segment */
|
|
ss->dpl = 0;
|
|
ss->p = 1;
|
|
}
|
|
|
|
static int
|
|
emulate_syscall(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
struct desc_struct cs, ss;
|
|
u64 msr_data;
|
|
u16 cs_sel, ss_sel;
|
|
|
|
/* syscall is not available in real mode */
|
|
if (ctxt->mode == X86EMUL_MODE_REAL ||
|
|
ctxt->mode == X86EMUL_MODE_VM86)
|
|
return emulate_ud(ctxt);
|
|
|
|
setup_syscalls_segments(ctxt, ops, &cs, &ss);
|
|
|
|
ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data);
|
|
msr_data >>= 32;
|
|
cs_sel = (u16)(msr_data & 0xfffc);
|
|
ss_sel = (u16)(msr_data + 8);
|
|
|
|
if (is_long_mode(ctxt->vcpu)) {
|
|
cs.d = 0;
|
|
cs.l = 1;
|
|
}
|
|
ops->set_cached_descriptor(&cs, 0, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_cached_descriptor(&ss, 0, VCPU_SREG_SS, ctxt->vcpu);
|
|
ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu);
|
|
|
|
c->regs[VCPU_REGS_RCX] = c->eip;
|
|
if (is_long_mode(ctxt->vcpu)) {
|
|
#ifdef CONFIG_X86_64
|
|
c->regs[VCPU_REGS_R11] = ctxt->eflags & ~EFLG_RF;
|
|
|
|
ops->get_msr(ctxt->vcpu,
|
|
ctxt->mode == X86EMUL_MODE_PROT64 ?
|
|
MSR_LSTAR : MSR_CSTAR, &msr_data);
|
|
c->eip = msr_data;
|
|
|
|
ops->get_msr(ctxt->vcpu, MSR_SYSCALL_MASK, &msr_data);
|
|
ctxt->eflags &= ~(msr_data | EFLG_RF);
|
|
#endif
|
|
} else {
|
|
/* legacy mode */
|
|
ops->get_msr(ctxt->vcpu, MSR_STAR, &msr_data);
|
|
c->eip = (u32)msr_data;
|
|
|
|
ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
|
|
}
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int
|
|
emulate_sysenter(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
struct desc_struct cs, ss;
|
|
u64 msr_data;
|
|
u16 cs_sel, ss_sel;
|
|
|
|
/* inject #GP if in real mode */
|
|
if (ctxt->mode == X86EMUL_MODE_REAL)
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
/* XXX sysenter/sysexit have not been tested in 64bit mode.
|
|
* Therefore, we inject an #UD.
|
|
*/
|
|
if (ctxt->mode == X86EMUL_MODE_PROT64)
|
|
return emulate_ud(ctxt);
|
|
|
|
setup_syscalls_segments(ctxt, ops, &cs, &ss);
|
|
|
|
ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data);
|
|
switch (ctxt->mode) {
|
|
case X86EMUL_MODE_PROT32:
|
|
if ((msr_data & 0xfffc) == 0x0)
|
|
return emulate_gp(ctxt, 0);
|
|
break;
|
|
case X86EMUL_MODE_PROT64:
|
|
if (msr_data == 0x0)
|
|
return emulate_gp(ctxt, 0);
|
|
break;
|
|
}
|
|
|
|
ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);
|
|
cs_sel = (u16)msr_data;
|
|
cs_sel &= ~SELECTOR_RPL_MASK;
|
|
ss_sel = cs_sel + 8;
|
|
ss_sel &= ~SELECTOR_RPL_MASK;
|
|
if (ctxt->mode == X86EMUL_MODE_PROT64
|
|
|| is_long_mode(ctxt->vcpu)) {
|
|
cs.d = 0;
|
|
cs.l = 1;
|
|
}
|
|
|
|
ops->set_cached_descriptor(&cs, 0, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_cached_descriptor(&ss, 0, VCPU_SREG_SS, ctxt->vcpu);
|
|
ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu);
|
|
|
|
ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_EIP, &msr_data);
|
|
c->eip = msr_data;
|
|
|
|
ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_ESP, &msr_data);
|
|
c->regs[VCPU_REGS_RSP] = msr_data;
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int
|
|
emulate_sysexit(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
struct desc_struct cs, ss;
|
|
u64 msr_data;
|
|
int usermode;
|
|
u16 cs_sel, ss_sel;
|
|
|
|
/* inject #GP if in real mode or Virtual 8086 mode */
|
|
if (ctxt->mode == X86EMUL_MODE_REAL ||
|
|
ctxt->mode == X86EMUL_MODE_VM86)
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
setup_syscalls_segments(ctxt, ops, &cs, &ss);
|
|
|
|
if ((c->rex_prefix & 0x8) != 0x0)
|
|
usermode = X86EMUL_MODE_PROT64;
|
|
else
|
|
usermode = X86EMUL_MODE_PROT32;
|
|
|
|
cs.dpl = 3;
|
|
ss.dpl = 3;
|
|
ops->get_msr(ctxt->vcpu, MSR_IA32_SYSENTER_CS, &msr_data);
|
|
switch (usermode) {
|
|
case X86EMUL_MODE_PROT32:
|
|
cs_sel = (u16)(msr_data + 16);
|
|
if ((msr_data & 0xfffc) == 0x0)
|
|
return emulate_gp(ctxt, 0);
|
|
ss_sel = (u16)(msr_data + 24);
|
|
break;
|
|
case X86EMUL_MODE_PROT64:
|
|
cs_sel = (u16)(msr_data + 32);
|
|
if (msr_data == 0x0)
|
|
return emulate_gp(ctxt, 0);
|
|
ss_sel = cs_sel + 8;
|
|
cs.d = 0;
|
|
cs.l = 1;
|
|
break;
|
|
}
|
|
cs_sel |= SELECTOR_RPL_MASK;
|
|
ss_sel |= SELECTOR_RPL_MASK;
|
|
|
|
ops->set_cached_descriptor(&cs, 0, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_segment_selector(cs_sel, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_cached_descriptor(&ss, 0, VCPU_SREG_SS, ctxt->vcpu);
|
|
ops->set_segment_selector(ss_sel, VCPU_SREG_SS, ctxt->vcpu);
|
|
|
|
c->eip = c->regs[VCPU_REGS_RDX];
|
|
c->regs[VCPU_REGS_RSP] = c->regs[VCPU_REGS_RCX];
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static bool emulator_bad_iopl(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops)
|
|
{
|
|
int iopl;
|
|
if (ctxt->mode == X86EMUL_MODE_REAL)
|
|
return false;
|
|
if (ctxt->mode == X86EMUL_MODE_VM86)
|
|
return true;
|
|
iopl = (ctxt->eflags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
|
|
return ops->cpl(ctxt->vcpu) > iopl;
|
|
}
|
|
|
|
static bool emulator_io_port_access_allowed(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 port, u16 len)
|
|
{
|
|
struct desc_struct tr_seg;
|
|
u32 base3;
|
|
int r;
|
|
u16 io_bitmap_ptr, perm, bit_idx = port & 0x7;
|
|
unsigned mask = (1 << len) - 1;
|
|
unsigned long base;
|
|
|
|
ops->get_cached_descriptor(&tr_seg, &base3, VCPU_SREG_TR, ctxt->vcpu);
|
|
if (!tr_seg.p)
|
|
return false;
|
|
if (desc_limit_scaled(&tr_seg) < 103)
|
|
return false;
|
|
base = get_desc_base(&tr_seg);
|
|
#ifdef CONFIG_X86_64
|
|
base |= ((u64)base3) << 32;
|
|
#endif
|
|
r = ops->read_std(base + 102, &io_bitmap_ptr, 2, ctxt->vcpu, NULL);
|
|
if (r != X86EMUL_CONTINUE)
|
|
return false;
|
|
if (io_bitmap_ptr + port/8 > desc_limit_scaled(&tr_seg))
|
|
return false;
|
|
r = ops->read_std(base + io_bitmap_ptr + port/8, &perm, 2, ctxt->vcpu,
|
|
NULL);
|
|
if (r != X86EMUL_CONTINUE)
|
|
return false;
|
|
if ((perm >> bit_idx) & mask)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static bool emulator_io_permited(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 port, u16 len)
|
|
{
|
|
if (ctxt->perm_ok)
|
|
return true;
|
|
|
|
if (emulator_bad_iopl(ctxt, ops))
|
|
if (!emulator_io_port_access_allowed(ctxt, ops, port, len))
|
|
return false;
|
|
|
|
ctxt->perm_ok = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct tss_segment_16 *tss)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
tss->ip = c->eip;
|
|
tss->flag = ctxt->eflags;
|
|
tss->ax = c->regs[VCPU_REGS_RAX];
|
|
tss->cx = c->regs[VCPU_REGS_RCX];
|
|
tss->dx = c->regs[VCPU_REGS_RDX];
|
|
tss->bx = c->regs[VCPU_REGS_RBX];
|
|
tss->sp = c->regs[VCPU_REGS_RSP];
|
|
tss->bp = c->regs[VCPU_REGS_RBP];
|
|
tss->si = c->regs[VCPU_REGS_RSI];
|
|
tss->di = c->regs[VCPU_REGS_RDI];
|
|
|
|
tss->es = ops->get_segment_selector(VCPU_SREG_ES, ctxt->vcpu);
|
|
tss->cs = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
|
|
tss->ss = ops->get_segment_selector(VCPU_SREG_SS, ctxt->vcpu);
|
|
tss->ds = ops->get_segment_selector(VCPU_SREG_DS, ctxt->vcpu);
|
|
tss->ldt = ops->get_segment_selector(VCPU_SREG_LDTR, ctxt->vcpu);
|
|
}
|
|
|
|
static int load_state_from_tss16(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct tss_segment_16 *tss)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int ret;
|
|
|
|
c->eip = tss->ip;
|
|
ctxt->eflags = tss->flag | 2;
|
|
c->regs[VCPU_REGS_RAX] = tss->ax;
|
|
c->regs[VCPU_REGS_RCX] = tss->cx;
|
|
c->regs[VCPU_REGS_RDX] = tss->dx;
|
|
c->regs[VCPU_REGS_RBX] = tss->bx;
|
|
c->regs[VCPU_REGS_RSP] = tss->sp;
|
|
c->regs[VCPU_REGS_RBP] = tss->bp;
|
|
c->regs[VCPU_REGS_RSI] = tss->si;
|
|
c->regs[VCPU_REGS_RDI] = tss->di;
|
|
|
|
/*
|
|
* SDM says that segment selectors are loaded before segment
|
|
* descriptors
|
|
*/
|
|
ops->set_segment_selector(tss->ldt, VCPU_SREG_LDTR, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->es, VCPU_SREG_ES, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->cs, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->ss, VCPU_SREG_SS, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->ds, VCPU_SREG_DS, ctxt->vcpu);
|
|
|
|
/*
|
|
* Now load segment descriptors. If fault happenes at this stage
|
|
* it is handled in a context of new task
|
|
*/
|
|
ret = load_segment_descriptor(ctxt, ops, tss->ldt, VCPU_SREG_LDTR);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->es, VCPU_SREG_ES);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->cs, VCPU_SREG_CS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->ss, VCPU_SREG_SS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->ds, VCPU_SREG_DS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int task_switch_16(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 tss_selector, u16 old_tss_sel,
|
|
ulong old_tss_base, struct desc_struct *new_desc)
|
|
{
|
|
struct tss_segment_16 tss_seg;
|
|
int ret;
|
|
u32 new_tss_base = get_desc_base(new_desc);
|
|
|
|
ret = ops->read_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
|
|
save_state_to_tss16(ctxt, ops, &tss_seg);
|
|
|
|
ret = ops->write_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
|
|
ret = ops->read_std(new_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
|
|
if (old_tss_sel != 0xffff) {
|
|
tss_seg.prev_task_link = old_tss_sel;
|
|
|
|
ret = ops->write_std(new_tss_base,
|
|
&tss_seg.prev_task_link,
|
|
sizeof tss_seg.prev_task_link,
|
|
ctxt->vcpu, &ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
}
|
|
|
|
return load_state_from_tss16(ctxt, ops, &tss_seg);
|
|
}
|
|
|
|
static void save_state_to_tss32(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct tss_segment_32 *tss)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
tss->cr3 = ops->get_cr(3, ctxt->vcpu);
|
|
tss->eip = c->eip;
|
|
tss->eflags = ctxt->eflags;
|
|
tss->eax = c->regs[VCPU_REGS_RAX];
|
|
tss->ecx = c->regs[VCPU_REGS_RCX];
|
|
tss->edx = c->regs[VCPU_REGS_RDX];
|
|
tss->ebx = c->regs[VCPU_REGS_RBX];
|
|
tss->esp = c->regs[VCPU_REGS_RSP];
|
|
tss->ebp = c->regs[VCPU_REGS_RBP];
|
|
tss->esi = c->regs[VCPU_REGS_RSI];
|
|
tss->edi = c->regs[VCPU_REGS_RDI];
|
|
|
|
tss->es = ops->get_segment_selector(VCPU_SREG_ES, ctxt->vcpu);
|
|
tss->cs = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
|
|
tss->ss = ops->get_segment_selector(VCPU_SREG_SS, ctxt->vcpu);
|
|
tss->ds = ops->get_segment_selector(VCPU_SREG_DS, ctxt->vcpu);
|
|
tss->fs = ops->get_segment_selector(VCPU_SREG_FS, ctxt->vcpu);
|
|
tss->gs = ops->get_segment_selector(VCPU_SREG_GS, ctxt->vcpu);
|
|
tss->ldt_selector = ops->get_segment_selector(VCPU_SREG_LDTR, ctxt->vcpu);
|
|
}
|
|
|
|
static int load_state_from_tss32(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
struct tss_segment_32 *tss)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int ret;
|
|
|
|
if (ops->set_cr(3, tss->cr3, ctxt->vcpu))
|
|
return emulate_gp(ctxt, 0);
|
|
c->eip = tss->eip;
|
|
ctxt->eflags = tss->eflags | 2;
|
|
c->regs[VCPU_REGS_RAX] = tss->eax;
|
|
c->regs[VCPU_REGS_RCX] = tss->ecx;
|
|
c->regs[VCPU_REGS_RDX] = tss->edx;
|
|
c->regs[VCPU_REGS_RBX] = tss->ebx;
|
|
c->regs[VCPU_REGS_RSP] = tss->esp;
|
|
c->regs[VCPU_REGS_RBP] = tss->ebp;
|
|
c->regs[VCPU_REGS_RSI] = tss->esi;
|
|
c->regs[VCPU_REGS_RDI] = tss->edi;
|
|
|
|
/*
|
|
* SDM says that segment selectors are loaded before segment
|
|
* descriptors
|
|
*/
|
|
ops->set_segment_selector(tss->ldt_selector, VCPU_SREG_LDTR, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->es, VCPU_SREG_ES, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->cs, VCPU_SREG_CS, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->ss, VCPU_SREG_SS, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->ds, VCPU_SREG_DS, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->fs, VCPU_SREG_FS, ctxt->vcpu);
|
|
ops->set_segment_selector(tss->gs, VCPU_SREG_GS, ctxt->vcpu);
|
|
|
|
/*
|
|
* Now load segment descriptors. If fault happenes at this stage
|
|
* it is handled in a context of new task
|
|
*/
|
|
ret = load_segment_descriptor(ctxt, ops, tss->ldt_selector, VCPU_SREG_LDTR);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->es, VCPU_SREG_ES);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->cs, VCPU_SREG_CS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->ss, VCPU_SREG_SS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->ds, VCPU_SREG_DS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->fs, VCPU_SREG_FS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = load_segment_descriptor(ctxt, ops, tss->gs, VCPU_SREG_GS);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int task_switch_32(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 tss_selector, u16 old_tss_sel,
|
|
ulong old_tss_base, struct desc_struct *new_desc)
|
|
{
|
|
struct tss_segment_32 tss_seg;
|
|
int ret;
|
|
u32 new_tss_base = get_desc_base(new_desc);
|
|
|
|
ret = ops->read_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
|
|
save_state_to_tss32(ctxt, ops, &tss_seg);
|
|
|
|
ret = ops->write_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
|
|
ret = ops->read_std(new_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
|
|
&ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
|
|
if (old_tss_sel != 0xffff) {
|
|
tss_seg.prev_task_link = old_tss_sel;
|
|
|
|
ret = ops->write_std(new_tss_base,
|
|
&tss_seg.prev_task_link,
|
|
sizeof tss_seg.prev_task_link,
|
|
ctxt->vcpu, &ctxt->exception);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
/* FIXME: need to provide precise fault address */
|
|
return ret;
|
|
}
|
|
|
|
return load_state_from_tss32(ctxt, ops, &tss_seg);
|
|
}
|
|
|
|
static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops,
|
|
u16 tss_selector, int reason,
|
|
bool has_error_code, u32 error_code)
|
|
{
|
|
struct desc_struct curr_tss_desc, next_tss_desc;
|
|
int ret;
|
|
u16 old_tss_sel = ops->get_segment_selector(VCPU_SREG_TR, ctxt->vcpu);
|
|
ulong old_tss_base =
|
|
ops->get_cached_segment_base(VCPU_SREG_TR, ctxt->vcpu);
|
|
u32 desc_limit;
|
|
|
|
/* FIXME: old_tss_base == ~0 ? */
|
|
|
|
ret = read_segment_descriptor(ctxt, ops, tss_selector, &next_tss_desc);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
ret = read_segment_descriptor(ctxt, ops, old_tss_sel, &curr_tss_desc);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
|
|
/* FIXME: check that next_tss_desc is tss */
|
|
|
|
if (reason != TASK_SWITCH_IRET) {
|
|
if ((tss_selector & 3) > next_tss_desc.dpl ||
|
|
ops->cpl(ctxt->vcpu) > next_tss_desc.dpl)
|
|
return emulate_gp(ctxt, 0);
|
|
}
|
|
|
|
desc_limit = desc_limit_scaled(&next_tss_desc);
|
|
if (!next_tss_desc.p ||
|
|
((desc_limit < 0x67 && (next_tss_desc.type & 8)) ||
|
|
desc_limit < 0x2b)) {
|
|
emulate_ts(ctxt, tss_selector & 0xfffc);
|
|
return X86EMUL_PROPAGATE_FAULT;
|
|
}
|
|
|
|
if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
|
|
curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */
|
|
write_segment_descriptor(ctxt, ops, old_tss_sel,
|
|
&curr_tss_desc);
|
|
}
|
|
|
|
if (reason == TASK_SWITCH_IRET)
|
|
ctxt->eflags = ctxt->eflags & ~X86_EFLAGS_NT;
|
|
|
|
/* set back link to prev task only if NT bit is set in eflags
|
|
note that old_tss_sel is not used afetr this point */
|
|
if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE)
|
|
old_tss_sel = 0xffff;
|
|
|
|
if (next_tss_desc.type & 8)
|
|
ret = task_switch_32(ctxt, ops, tss_selector, old_tss_sel,
|
|
old_tss_base, &next_tss_desc);
|
|
else
|
|
ret = task_switch_16(ctxt, ops, tss_selector, old_tss_sel,
|
|
old_tss_base, &next_tss_desc);
|
|
if (ret != X86EMUL_CONTINUE)
|
|
return ret;
|
|
|
|
if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE)
|
|
ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT;
|
|
|
|
if (reason != TASK_SWITCH_IRET) {
|
|
next_tss_desc.type |= (1 << 1); /* set busy flag */
|
|
write_segment_descriptor(ctxt, ops, tss_selector,
|
|
&next_tss_desc);
|
|
}
|
|
|
|
ops->set_cr(0, ops->get_cr(0, ctxt->vcpu) | X86_CR0_TS, ctxt->vcpu);
|
|
ops->set_cached_descriptor(&next_tss_desc, 0, VCPU_SREG_TR, ctxt->vcpu);
|
|
ops->set_segment_selector(tss_selector, VCPU_SREG_TR, ctxt->vcpu);
|
|
|
|
if (has_error_code) {
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
c->op_bytes = c->ad_bytes = (next_tss_desc.type & 8) ? 4 : 2;
|
|
c->lock_prefix = 0;
|
|
c->src.val = (unsigned long) error_code;
|
|
emulate_push(ctxt, ops);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
|
|
u16 tss_selector, int reason,
|
|
bool has_error_code, u32 error_code)
|
|
{
|
|
struct x86_emulate_ops *ops = ctxt->ops;
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc;
|
|
|
|
c->eip = ctxt->eip;
|
|
c->dst.type = OP_NONE;
|
|
|
|
rc = emulator_do_task_switch(ctxt, ops, tss_selector, reason,
|
|
has_error_code, error_code);
|
|
|
|
if (rc == X86EMUL_CONTINUE) {
|
|
rc = writeback(ctxt, ops);
|
|
if (rc == X86EMUL_CONTINUE)
|
|
ctxt->eip = c->eip;
|
|
}
|
|
|
|
return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
|
|
}
|
|
|
|
static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned seg,
|
|
int reg, struct operand *op)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int df = (ctxt->eflags & EFLG_DF) ? -1 : 1;
|
|
|
|
register_address_increment(c, &c->regs[reg], df * op->bytes);
|
|
op->addr.mem.ea = register_address(c, c->regs[reg]);
|
|
op->addr.mem.seg = seg;
|
|
}
|
|
|
|
static int em_push(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
emulate_push(ctxt, ctxt->ops);
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_das(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
u8 al, old_al;
|
|
bool af, cf, old_cf;
|
|
|
|
cf = ctxt->eflags & X86_EFLAGS_CF;
|
|
al = c->dst.val;
|
|
|
|
old_al = al;
|
|
old_cf = cf;
|
|
cf = false;
|
|
af = ctxt->eflags & X86_EFLAGS_AF;
|
|
if ((al & 0x0f) > 9 || af) {
|
|
al -= 6;
|
|
cf = old_cf | (al >= 250);
|
|
af = true;
|
|
} else {
|
|
af = false;
|
|
}
|
|
if (old_al > 0x99 || old_cf) {
|
|
al -= 0x60;
|
|
cf = true;
|
|
}
|
|
|
|
c->dst.val = al;
|
|
/* Set PF, ZF, SF */
|
|
c->src.type = OP_IMM;
|
|
c->src.val = 0;
|
|
c->src.bytes = 1;
|
|
emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
|
|
ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
|
|
if (cf)
|
|
ctxt->eflags |= X86_EFLAGS_CF;
|
|
if (af)
|
|
ctxt->eflags |= X86_EFLAGS_AF;
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_call_far(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
u16 sel, old_cs;
|
|
ulong old_eip;
|
|
int rc;
|
|
|
|
old_cs = ctxt->ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
|
|
old_eip = c->eip;
|
|
|
|
memcpy(&sel, c->src.valptr + c->op_bytes, 2);
|
|
if (load_segment_descriptor(ctxt, ctxt->ops, sel, VCPU_SREG_CS))
|
|
return X86EMUL_CONTINUE;
|
|
|
|
c->eip = 0;
|
|
memcpy(&c->eip, c->src.valptr, c->op_bytes);
|
|
|
|
c->src.val = old_cs;
|
|
emulate_push(ctxt, ctxt->ops);
|
|
rc = writeback(ctxt, ctxt->ops);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
c->src.val = old_eip;
|
|
emulate_push(ctxt, ctxt->ops);
|
|
rc = writeback(ctxt, ctxt->ops);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
|
|
c->dst.type = OP_NONE;
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc;
|
|
|
|
c->dst.type = OP_REG;
|
|
c->dst.addr.reg = &c->eip;
|
|
c->dst.bytes = c->op_bytes;
|
|
rc = emulate_pop(ctxt, ctxt->ops, &c->dst.val, c->op_bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
return rc;
|
|
register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->src.val);
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_imul(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
emulate_2op_SrcV_nobyte("imul", c->src, c->dst, ctxt->eflags);
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
c->dst.val = c->src2.val;
|
|
return em_imul(ctxt);
|
|
}
|
|
|
|
static int em_cwd(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
c->dst.type = OP_REG;
|
|
c->dst.bytes = c->src.bytes;
|
|
c->dst.addr.reg = &c->regs[VCPU_REGS_RDX];
|
|
c->dst.val = ~((c->src.val >> (c->src.bytes * 8 - 1)) - 1);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
u64 tsc = 0;
|
|
|
|
ctxt->ops->get_msr(ctxt->vcpu, MSR_IA32_TSC, &tsc);
|
|
c->regs[VCPU_REGS_RAX] = (u32)tsc;
|
|
c->regs[VCPU_REGS_RDX] = tsc >> 32;
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_mov(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
c->dst.val = c->src.val;
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_movdqu(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
memcpy(&c->dst.vec_val, &c->src.vec_val, c->op_bytes);
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int em_invlpg(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc;
|
|
ulong linear;
|
|
|
|
rc = linearize(ctxt, c->src.addr.mem, 1, false, &linear);
|
|
if (rc == X86EMUL_CONTINUE)
|
|
emulate_invlpg(ctxt->vcpu, linear);
|
|
/* Disable writeback. */
|
|
c->dst.type = OP_NONE;
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static bool valid_cr(int nr)
|
|
{
|
|
switch (nr) {
|
|
case 0:
|
|
case 2 ... 4:
|
|
case 8:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int check_cr_read(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
if (!valid_cr(c->modrm_reg))
|
|
return emulate_ud(ctxt);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int check_cr_write(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
u64 new_val = c->src.val64;
|
|
int cr = c->modrm_reg;
|
|
|
|
static u64 cr_reserved_bits[] = {
|
|
0xffffffff00000000ULL,
|
|
0, 0, 0, /* CR3 checked later */
|
|
CR4_RESERVED_BITS,
|
|
0, 0, 0,
|
|
CR8_RESERVED_BITS,
|
|
};
|
|
|
|
if (!valid_cr(cr))
|
|
return emulate_ud(ctxt);
|
|
|
|
if (new_val & cr_reserved_bits[cr])
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
switch (cr) {
|
|
case 0: {
|
|
u64 cr4, efer;
|
|
if (((new_val & X86_CR0_PG) && !(new_val & X86_CR0_PE)) ||
|
|
((new_val & X86_CR0_NW) && !(new_val & X86_CR0_CD)))
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
cr4 = ctxt->ops->get_cr(4, ctxt->vcpu);
|
|
ctxt->ops->get_msr(ctxt->vcpu, MSR_EFER, &efer);
|
|
|
|
if ((new_val & X86_CR0_PG) && (efer & EFER_LME) &&
|
|
!(cr4 & X86_CR4_PAE))
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
break;
|
|
}
|
|
case 3: {
|
|
u64 rsvd = 0;
|
|
|
|
if (is_long_mode(ctxt->vcpu))
|
|
rsvd = CR3_L_MODE_RESERVED_BITS;
|
|
else if (is_pae(ctxt->vcpu))
|
|
rsvd = CR3_PAE_RESERVED_BITS;
|
|
else if (is_paging(ctxt->vcpu))
|
|
rsvd = CR3_NONPAE_RESERVED_BITS;
|
|
|
|
if (new_val & rsvd)
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
break;
|
|
}
|
|
case 4: {
|
|
u64 cr4, efer;
|
|
|
|
cr4 = ctxt->ops->get_cr(4, ctxt->vcpu);
|
|
ctxt->ops->get_msr(ctxt->vcpu, MSR_EFER, &efer);
|
|
|
|
if ((efer & EFER_LMA) && !(new_val & X86_CR4_PAE))
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
unsigned long dr7;
|
|
|
|
ctxt->ops->get_dr(7, &dr7, ctxt->vcpu);
|
|
|
|
/* Check if DR7.Global_Enable is set */
|
|
return dr7 & (1 << 13);
|
|
}
|
|
|
|
static int check_dr_read(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int dr = c->modrm_reg;
|
|
u64 cr4;
|
|
|
|
if (dr > 7)
|
|
return emulate_ud(ctxt);
|
|
|
|
cr4 = ctxt->ops->get_cr(4, ctxt->vcpu);
|
|
if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5))
|
|
return emulate_ud(ctxt);
|
|
|
|
if (check_dr7_gd(ctxt))
|
|
return emulate_db(ctxt);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int check_dr_write(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
u64 new_val = c->src.val64;
|
|
int dr = c->modrm_reg;
|
|
|
|
if ((dr == 6 || dr == 7) && (new_val & 0xffffffff00000000ULL))
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
return check_dr_read(ctxt);
|
|
}
|
|
|
|
static int check_svme(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
u64 efer;
|
|
|
|
ctxt->ops->get_msr(ctxt->vcpu, MSR_EFER, &efer);
|
|
|
|
if (!(efer & EFER_SVME))
|
|
return emulate_ud(ctxt);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int check_svme_pa(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
u64 rax = kvm_register_read(ctxt->vcpu, VCPU_REGS_RAX);
|
|
|
|
/* Valid physical address? */
|
|
if (rax & 0xffff000000000000)
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
return check_svme(ctxt);
|
|
}
|
|
|
|
static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
u64 cr4 = ctxt->ops->get_cr(4, ctxt->vcpu);
|
|
|
|
if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt->vcpu))
|
|
return emulate_ud(ctxt);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
u64 cr4 = ctxt->ops->get_cr(4, ctxt->vcpu);
|
|
u64 rcx = kvm_register_read(ctxt->vcpu, VCPU_REGS_RCX);
|
|
|
|
if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt->vcpu)) ||
|
|
(rcx > 3))
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int check_perm_in(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
c->dst.bytes = min(c->dst.bytes, 4u);
|
|
if (!emulator_io_permited(ctxt, ctxt->ops, c->src.val, c->dst.bytes))
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static int check_perm_out(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
c->src.bytes = min(c->src.bytes, 4u);
|
|
if (!emulator_io_permited(ctxt, ctxt->ops, c->dst.val, c->src.bytes))
|
|
return emulate_gp(ctxt, 0);
|
|
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
#define D(_y) { .flags = (_y) }
|
|
#define DI(_y, _i) { .flags = (_y), .intercept = x86_intercept_##_i }
|
|
#define DIP(_y, _i, _p) { .flags = (_y), .intercept = x86_intercept_##_i, \
|
|
.check_perm = (_p) }
|
|
#define N D(0)
|
|
#define EXT(_f, _e) { .flags = ((_f) | RMExt), .u.group = (_e) }
|
|
#define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
|
|
#define GD(_f, _g) { .flags = ((_f) | Group | GroupDual), .u.gdual = (_g) }
|
|
#define I(_f, _e) { .flags = (_f), .u.execute = (_e) }
|
|
#define II(_f, _e, _i) \
|
|
{ .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i }
|
|
#define IIP(_f, _e, _i, _p) \
|
|
{ .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i, \
|
|
.check_perm = (_p) }
|
|
#define GP(_f, _g) { .flags = ((_f) | Prefix), .u.gprefix = (_g) }
|
|
|
|
#define D2bv(_f) D((_f) | ByteOp), D(_f)
|
|
#define D2bvIP(_f, _i, _p) DIP((_f) | ByteOp, _i, _p), DIP(_f, _i, _p)
|
|
#define I2bv(_f, _e) I((_f) | ByteOp, _e), I(_f, _e)
|
|
|
|
#define D6ALU(_f) D2bv((_f) | DstMem | SrcReg | ModRM), \
|
|
D2bv(((_f) | DstReg | SrcMem | ModRM) & ~Lock), \
|
|
D2bv(((_f) & ~Lock) | DstAcc | SrcImm)
|
|
|
|
static struct opcode group7_rm1[] = {
|
|
DI(SrcNone | ModRM | Priv, monitor),
|
|
DI(SrcNone | ModRM | Priv, mwait),
|
|
N, N, N, N, N, N,
|
|
};
|
|
|
|
static struct opcode group7_rm3[] = {
|
|
DIP(SrcNone | ModRM | Prot | Priv, vmrun, check_svme_pa),
|
|
DI(SrcNone | ModRM | Prot | VendorSpecific, vmmcall),
|
|
DIP(SrcNone | ModRM | Prot | Priv, vmload, check_svme_pa),
|
|
DIP(SrcNone | ModRM | Prot | Priv, vmsave, check_svme_pa),
|
|
DIP(SrcNone | ModRM | Prot | Priv, stgi, check_svme),
|
|
DIP(SrcNone | ModRM | Prot | Priv, clgi, check_svme),
|
|
DIP(SrcNone | ModRM | Prot | Priv, skinit, check_svme),
|
|
DIP(SrcNone | ModRM | Prot | Priv, invlpga, check_svme),
|
|
};
|
|
|
|
static struct opcode group7_rm7[] = {
|
|
N,
|
|
DIP(SrcNone | ModRM, rdtscp, check_rdtsc),
|
|
N, N, N, N, N, N,
|
|
};
|
|
static struct opcode group1[] = {
|
|
X7(D(Lock)), N
|
|
};
|
|
|
|
static struct opcode group1A[] = {
|
|
D(DstMem | SrcNone | ModRM | Mov | Stack), N, N, N, N, N, N, N,
|
|
};
|
|
|
|
static struct opcode group3[] = {
|
|
D(DstMem | SrcImm | ModRM), D(DstMem | SrcImm | ModRM),
|
|
D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
|
|
X4(D(SrcMem | ModRM)),
|
|
};
|
|
|
|
static struct opcode group4[] = {
|
|
D(ByteOp | DstMem | SrcNone | ModRM | Lock), D(ByteOp | DstMem | SrcNone | ModRM | Lock),
|
|
N, N, N, N, N, N,
|
|
};
|
|
|
|
static struct opcode group5[] = {
|
|
D(DstMem | SrcNone | ModRM | Lock), D(DstMem | SrcNone | ModRM | Lock),
|
|
D(SrcMem | ModRM | Stack),
|
|
I(SrcMemFAddr | ModRM | ImplicitOps | Stack, em_call_far),
|
|
D(SrcMem | ModRM | Stack), D(SrcMemFAddr | ModRM | ImplicitOps),
|
|
D(SrcMem | ModRM | Stack), N,
|
|
};
|
|
|
|
static struct opcode group6[] = {
|
|
DI(ModRM | Prot, sldt),
|
|
DI(ModRM | Prot, str),
|
|
DI(ModRM | Prot | Priv, lldt),
|
|
DI(ModRM | Prot | Priv, ltr),
|
|
N, N, N, N,
|
|
};
|
|
|
|
static struct group_dual group7 = { {
|
|
DI(ModRM | Mov | DstMem | Priv, sgdt),
|
|
DI(ModRM | Mov | DstMem | Priv, sidt),
|
|
DI(ModRM | SrcMem | Priv, lgdt), DI(ModRM | SrcMem | Priv, lidt),
|
|
DI(SrcNone | ModRM | DstMem | Mov, smsw), N,
|
|
DI(SrcMem16 | ModRM | Mov | Priv, lmsw),
|
|
DI(SrcMem | ModRM | ByteOp | Priv | NoAccess, invlpg),
|
|
}, {
|
|
D(SrcNone | ModRM | Priv | VendorSpecific), EXT(0, group7_rm1),
|
|
N, EXT(0, group7_rm3),
|
|
DI(SrcNone | ModRM | DstMem | Mov, smsw), N,
|
|
DI(SrcMem16 | ModRM | Mov | Priv, lmsw), EXT(0, group7_rm7),
|
|
} };
|
|
|
|
static struct opcode group8[] = {
|
|
N, N, N, N,
|
|
D(DstMem | SrcImmByte | ModRM), D(DstMem | SrcImmByte | ModRM | Lock),
|
|
D(DstMem | SrcImmByte | ModRM | Lock), D(DstMem | SrcImmByte | ModRM | Lock),
|
|
};
|
|
|
|
static struct group_dual group9 = { {
|
|
N, D(DstMem64 | ModRM | Lock), N, N, N, N, N, N,
|
|
}, {
|
|
N, N, N, N, N, N, N, N,
|
|
} };
|
|
|
|
static struct opcode group11[] = {
|
|
I(DstMem | SrcImm | ModRM | Mov, em_mov), X7(D(Undefined)),
|
|
};
|
|
|
|
static struct gprefix pfx_0f_6f_0f_7f = {
|
|
N, N, N, I(Sse, em_movdqu),
|
|
};
|
|
|
|
static struct opcode opcode_table[256] = {
|
|
/* 0x00 - 0x07 */
|
|
D6ALU(Lock),
|
|
D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
|
|
/* 0x08 - 0x0F */
|
|
D6ALU(Lock),
|
|
D(ImplicitOps | Stack | No64), N,
|
|
/* 0x10 - 0x17 */
|
|
D6ALU(Lock),
|
|
D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
|
|
/* 0x18 - 0x1F */
|
|
D6ALU(Lock),
|
|
D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
|
|
/* 0x20 - 0x27 */
|
|
D6ALU(Lock), N, N,
|
|
/* 0x28 - 0x2F */
|
|
D6ALU(Lock), N, I(ByteOp | DstAcc | No64, em_das),
|
|
/* 0x30 - 0x37 */
|
|
D6ALU(Lock), N, N,
|
|
/* 0x38 - 0x3F */
|
|
D6ALU(0), N, N,
|
|
/* 0x40 - 0x4F */
|
|
X16(D(DstReg)),
|
|
/* 0x50 - 0x57 */
|
|
X8(I(SrcReg | Stack, em_push)),
|
|
/* 0x58 - 0x5F */
|
|
X8(D(DstReg | Stack)),
|
|
/* 0x60 - 0x67 */
|
|
D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
|
|
N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
|
|
N, N, N, N,
|
|
/* 0x68 - 0x6F */
|
|
I(SrcImm | Mov | Stack, em_push),
|
|
I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
|
|
I(SrcImmByte | Mov | Stack, em_push),
|
|
I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
|
|
D2bvIP(DstDI | Mov | String, ins, check_perm_in), /* insb, insw/insd */
|
|
D2bvIP(SrcSI | ImplicitOps | String, outs, check_perm_out), /* outsb, outsw/outsd */
|
|
/* 0x70 - 0x7F */
|
|
X16(D(SrcImmByte)),
|
|
/* 0x80 - 0x87 */
|
|
G(ByteOp | DstMem | SrcImm | ModRM | Group, group1),
|
|
G(DstMem | SrcImm | ModRM | Group, group1),
|
|
G(ByteOp | DstMem | SrcImm | ModRM | No64 | Group, group1),
|
|
G(DstMem | SrcImmByte | ModRM | Group, group1),
|
|
D2bv(DstMem | SrcReg | ModRM), D2bv(DstMem | SrcReg | ModRM | Lock),
|
|
/* 0x88 - 0x8F */
|
|
I2bv(DstMem | SrcReg | ModRM | Mov, em_mov),
|
|
I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
|
|
D(DstMem | SrcNone | ModRM | Mov), D(ModRM | SrcMem | NoAccess | DstReg),
|
|
D(ImplicitOps | SrcMem16 | ModRM), G(0, group1A),
|
|
/* 0x90 - 0x97 */
|
|
DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)),
|
|
/* 0x98 - 0x9F */
|
|
D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
|
|
I(SrcImmFAddr | No64, em_call_far), N,
|
|
DI(ImplicitOps | Stack, pushf), DI(ImplicitOps | Stack, popf), N, N,
|
|
/* 0xA0 - 0xA7 */
|
|
I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
|
|
I2bv(DstMem | SrcAcc | Mov | MemAbs, em_mov),
|
|
I2bv(SrcSI | DstDI | Mov | String, em_mov),
|
|
D2bv(SrcSI | DstDI | String),
|
|
/* 0xA8 - 0xAF */
|
|
D2bv(DstAcc | SrcImm),
|
|
I2bv(SrcAcc | DstDI | Mov | String, em_mov),
|
|
I2bv(SrcSI | DstAcc | Mov | String, em_mov),
|
|
D2bv(SrcAcc | DstDI | String),
|
|
/* 0xB0 - 0xB7 */
|
|
X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
|
|
/* 0xB8 - 0xBF */
|
|
X8(I(DstReg | SrcImm | Mov, em_mov)),
|
|
/* 0xC0 - 0xC7 */
|
|
D2bv(DstMem | SrcImmByte | ModRM),
|
|
I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
|
|
D(ImplicitOps | Stack),
|
|
D(DstReg | SrcMemFAddr | ModRM | No64), D(DstReg | SrcMemFAddr | ModRM | No64),
|
|
G(ByteOp, group11), G(0, group11),
|
|
/* 0xC8 - 0xCF */
|
|
N, N, N, D(ImplicitOps | Stack),
|
|
D(ImplicitOps), DI(SrcImmByte, intn),
|
|
D(ImplicitOps | No64), DI(ImplicitOps, iret),
|
|
/* 0xD0 - 0xD7 */
|
|
D2bv(DstMem | SrcOne | ModRM), D2bv(DstMem | ModRM),
|
|
N, N, N, N,
|
|
/* 0xD8 - 0xDF */
|
|
N, N, N, N, N, N, N, N,
|
|
/* 0xE0 - 0xE7 */
|
|
X4(D(SrcImmByte)),
|
|
D2bvIP(SrcImmUByte | DstAcc, in, check_perm_in),
|
|
D2bvIP(SrcAcc | DstImmUByte, out, check_perm_out),
|
|
/* 0xE8 - 0xEF */
|
|
D(SrcImm | Stack), D(SrcImm | ImplicitOps),
|
|
D(SrcImmFAddr | No64), D(SrcImmByte | ImplicitOps),
|
|
D2bvIP(SrcNone | DstAcc, in, check_perm_in),
|
|
D2bvIP(SrcAcc | ImplicitOps, out, check_perm_out),
|
|
/* 0xF0 - 0xF7 */
|
|
N, DI(ImplicitOps, icebp), N, N,
|
|
DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
|
|
G(ByteOp, group3), G(0, group3),
|
|
/* 0xF8 - 0xFF */
|
|
D(ImplicitOps), D(ImplicitOps), D(ImplicitOps), D(ImplicitOps),
|
|
D(ImplicitOps), D(ImplicitOps), G(0, group4), G(0, group5),
|
|
};
|
|
|
|
static struct opcode twobyte_table[256] = {
|
|
/* 0x00 - 0x0F */
|
|
G(0, group6), GD(0, &group7), N, N,
|
|
N, D(ImplicitOps | VendorSpecific), DI(ImplicitOps | Priv, clts), N,
|
|
DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
|
|
N, D(ImplicitOps | ModRM), N, N,
|
|
/* 0x10 - 0x1F */
|
|
N, N, N, N, N, N, N, N, D(ImplicitOps | ModRM), N, N, N, N, N, N, N,
|
|
/* 0x20 - 0x2F */
|
|
DIP(ModRM | DstMem | Priv | Op3264, cr_read, check_cr_read),
|
|
DIP(ModRM | DstMem | Priv | Op3264, dr_read, check_dr_read),
|
|
DIP(ModRM | SrcMem | Priv | Op3264, cr_write, check_cr_write),
|
|
DIP(ModRM | SrcMem | Priv | Op3264, dr_write, check_dr_write),
|
|
N, N, N, N,
|
|
N, N, N, N, N, N, N, N,
|
|
/* 0x30 - 0x3F */
|
|
DI(ImplicitOps | Priv, wrmsr),
|
|
IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
|
|
DI(ImplicitOps | Priv, rdmsr),
|
|
DIP(ImplicitOps | Priv, rdpmc, check_rdpmc),
|
|
D(ImplicitOps | VendorSpecific), D(ImplicitOps | Priv | VendorSpecific),
|
|
N, N,
|
|
N, N, N, N, N, N, N, N,
|
|
/* 0x40 - 0x4F */
|
|
X16(D(DstReg | SrcMem | ModRM | Mov)),
|
|
/* 0x50 - 0x5F */
|
|
N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
|
|
/* 0x60 - 0x6F */
|
|
N, N, N, N,
|
|
N, N, N, N,
|
|
N, N, N, N,
|
|
N, N, N, GP(SrcMem | DstReg | ModRM | Mov, &pfx_0f_6f_0f_7f),
|
|
/* 0x70 - 0x7F */
|
|
N, N, N, N,
|
|
N, N, N, N,
|
|
N, N, N, N,
|
|
N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
|
|
/* 0x80 - 0x8F */
|
|
X16(D(SrcImm)),
|
|
/* 0x90 - 0x9F */
|
|
X16(D(ByteOp | DstMem | SrcNone | ModRM| Mov)),
|
|
/* 0xA0 - 0xA7 */
|
|
D(ImplicitOps | Stack), D(ImplicitOps | Stack),
|
|
DI(ImplicitOps, cpuid), D(DstMem | SrcReg | ModRM | BitOp),
|
|
D(DstMem | SrcReg | Src2ImmByte | ModRM),
|
|
D(DstMem | SrcReg | Src2CL | ModRM), N, N,
|
|
/* 0xA8 - 0xAF */
|
|
D(ImplicitOps | Stack), D(ImplicitOps | Stack),
|
|
DI(ImplicitOps, rsm), D(DstMem | SrcReg | ModRM | BitOp | Lock),
|
|
D(DstMem | SrcReg | Src2ImmByte | ModRM),
|
|
D(DstMem | SrcReg | Src2CL | ModRM),
|
|
D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),
|
|
/* 0xB0 - 0xB7 */
|
|
D2bv(DstMem | SrcReg | ModRM | Lock),
|
|
D(DstReg | SrcMemFAddr | ModRM), D(DstMem | SrcReg | ModRM | BitOp | Lock),
|
|
D(DstReg | SrcMemFAddr | ModRM), D(DstReg | SrcMemFAddr | ModRM),
|
|
D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
|
|
/* 0xB8 - 0xBF */
|
|
N, N,
|
|
G(BitOp, group8), D(DstMem | SrcReg | ModRM | BitOp | Lock),
|
|
D(DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM),
|
|
D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov),
|
|
/* 0xC0 - 0xCF */
|
|
D2bv(DstMem | SrcReg | ModRM | Lock),
|
|
N, D(DstMem | SrcReg | ModRM | Mov),
|
|
N, N, N, GD(0, &group9),
|
|
N, N, N, N, N, N, N, N,
|
|
/* 0xD0 - 0xDF */
|
|
N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
|
|
/* 0xE0 - 0xEF */
|
|
N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N,
|
|
/* 0xF0 - 0xFF */
|
|
N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N
|
|
};
|
|
|
|
#undef D
|
|
#undef N
|
|
#undef G
|
|
#undef GD
|
|
#undef I
|
|
#undef GP
|
|
#undef EXT
|
|
|
|
#undef D2bv
|
|
#undef D2bvIP
|
|
#undef I2bv
|
|
#undef D6ALU
|
|
|
|
static unsigned imm_size(struct decode_cache *c)
|
|
{
|
|
unsigned size;
|
|
|
|
size = (c->d & ByteOp) ? 1 : c->op_bytes;
|
|
if (size == 8)
|
|
size = 4;
|
|
return size;
|
|
}
|
|
|
|
static int decode_imm(struct x86_emulate_ctxt *ctxt, struct operand *op,
|
|
unsigned size, bool sign_extension)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
struct x86_emulate_ops *ops = ctxt->ops;
|
|
int rc = X86EMUL_CONTINUE;
|
|
|
|
op->type = OP_IMM;
|
|
op->bytes = size;
|
|
op->addr.mem.ea = c->eip;
|
|
/* NB. Immediates are sign-extended as necessary. */
|
|
switch (op->bytes) {
|
|
case 1:
|
|
op->val = insn_fetch(s8, 1, c->eip);
|
|
break;
|
|
case 2:
|
|
op->val = insn_fetch(s16, 2, c->eip);
|
|
break;
|
|
case 4:
|
|
op->val = insn_fetch(s32, 4, c->eip);
|
|
break;
|
|
}
|
|
if (!sign_extension) {
|
|
switch (op->bytes) {
|
|
case 1:
|
|
op->val &= 0xff;
|
|
break;
|
|
case 2:
|
|
op->val &= 0xffff;
|
|
break;
|
|
case 4:
|
|
op->val &= 0xffffffff;
|
|
break;
|
|
}
|
|
}
|
|
done:
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
|
|
{
|
|
struct x86_emulate_ops *ops = ctxt->ops;
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc = X86EMUL_CONTINUE;
|
|
int mode = ctxt->mode;
|
|
int def_op_bytes, def_ad_bytes, dual, goffset, simd_prefix;
|
|
bool op_prefix = false;
|
|
struct opcode opcode, *g_mod012, *g_mod3;
|
|
struct operand memop = { .type = OP_NONE };
|
|
|
|
c->eip = ctxt->eip;
|
|
c->fetch.start = c->eip;
|
|
c->fetch.end = c->fetch.start + insn_len;
|
|
if (insn_len > 0)
|
|
memcpy(c->fetch.data, insn, insn_len);
|
|
ctxt->cs_base = seg_base(ctxt, ops, VCPU_SREG_CS);
|
|
|
|
switch (mode) {
|
|
case X86EMUL_MODE_REAL:
|
|
case X86EMUL_MODE_VM86:
|
|
case X86EMUL_MODE_PROT16:
|
|
def_op_bytes = def_ad_bytes = 2;
|
|
break;
|
|
case X86EMUL_MODE_PROT32:
|
|
def_op_bytes = def_ad_bytes = 4;
|
|
break;
|
|
#ifdef CONFIG_X86_64
|
|
case X86EMUL_MODE_PROT64:
|
|
def_op_bytes = 4;
|
|
def_ad_bytes = 8;
|
|
break;
|
|
#endif
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
c->op_bytes = def_op_bytes;
|
|
c->ad_bytes = def_ad_bytes;
|
|
|
|
/* Legacy prefixes. */
|
|
for (;;) {
|
|
switch (c->b = insn_fetch(u8, 1, c->eip)) {
|
|
case 0x66: /* operand-size override */
|
|
op_prefix = true;
|
|
/* switch between 2/4 bytes */
|
|
c->op_bytes = def_op_bytes ^ 6;
|
|
break;
|
|
case 0x67: /* address-size override */
|
|
if (mode == X86EMUL_MODE_PROT64)
|
|
/* switch between 4/8 bytes */
|
|
c->ad_bytes = def_ad_bytes ^ 12;
|
|
else
|
|
/* switch between 2/4 bytes */
|
|
c->ad_bytes = def_ad_bytes ^ 6;
|
|
break;
|
|
case 0x26: /* ES override */
|
|
case 0x2e: /* CS override */
|
|
case 0x36: /* SS override */
|
|
case 0x3e: /* DS override */
|
|
set_seg_override(c, (c->b >> 3) & 3);
|
|
break;
|
|
case 0x64: /* FS override */
|
|
case 0x65: /* GS override */
|
|
set_seg_override(c, c->b & 7);
|
|
break;
|
|
case 0x40 ... 0x4f: /* REX */
|
|
if (mode != X86EMUL_MODE_PROT64)
|
|
goto done_prefixes;
|
|
c->rex_prefix = c->b;
|
|
continue;
|
|
case 0xf0: /* LOCK */
|
|
c->lock_prefix = 1;
|
|
break;
|
|
case 0xf2: /* REPNE/REPNZ */
|
|
case 0xf3: /* REP/REPE/REPZ */
|
|
c->rep_prefix = c->b;
|
|
break;
|
|
default:
|
|
goto done_prefixes;
|
|
}
|
|
|
|
/* Any legacy prefix after a REX prefix nullifies its effect. */
|
|
|
|
c->rex_prefix = 0;
|
|
}
|
|
|
|
done_prefixes:
|
|
|
|
/* REX prefix. */
|
|
if (c->rex_prefix & 8)
|
|
c->op_bytes = 8; /* REX.W */
|
|
|
|
/* Opcode byte(s). */
|
|
opcode = opcode_table[c->b];
|
|
/* Two-byte opcode? */
|
|
if (c->b == 0x0f) {
|
|
c->twobyte = 1;
|
|
c->b = insn_fetch(u8, 1, c->eip);
|
|
opcode = twobyte_table[c->b];
|
|
}
|
|
c->d = opcode.flags;
|
|
|
|
if (c->d & Group) {
|
|
dual = c->d & GroupDual;
|
|
c->modrm = insn_fetch(u8, 1, c->eip);
|
|
--c->eip;
|
|
|
|
if (c->d & GroupDual) {
|
|
g_mod012 = opcode.u.gdual->mod012;
|
|
g_mod3 = opcode.u.gdual->mod3;
|
|
} else
|
|
g_mod012 = g_mod3 = opcode.u.group;
|
|
|
|
c->d &= ~(Group | GroupDual);
|
|
|
|
goffset = (c->modrm >> 3) & 7;
|
|
|
|
if ((c->modrm >> 6) == 3)
|
|
opcode = g_mod3[goffset];
|
|
else
|
|
opcode = g_mod012[goffset];
|
|
|
|
if (opcode.flags & RMExt) {
|
|
goffset = c->modrm & 7;
|
|
opcode = opcode.u.group[goffset];
|
|
}
|
|
|
|
c->d |= opcode.flags;
|
|
}
|
|
|
|
if (c->d & Prefix) {
|
|
if (c->rep_prefix && op_prefix)
|
|
return X86EMUL_UNHANDLEABLE;
|
|
simd_prefix = op_prefix ? 0x66 : c->rep_prefix;
|
|
switch (simd_prefix) {
|
|
case 0x00: opcode = opcode.u.gprefix->pfx_no; break;
|
|
case 0x66: opcode = opcode.u.gprefix->pfx_66; break;
|
|
case 0xf2: opcode = opcode.u.gprefix->pfx_f2; break;
|
|
case 0xf3: opcode = opcode.u.gprefix->pfx_f3; break;
|
|
}
|
|
c->d |= opcode.flags;
|
|
}
|
|
|
|
c->execute = opcode.u.execute;
|
|
c->check_perm = opcode.check_perm;
|
|
c->intercept = opcode.intercept;
|
|
|
|
/* Unrecognised? */
|
|
if (c->d == 0 || (c->d & Undefined))
|
|
return -1;
|
|
|
|
if (!(c->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
|
|
return -1;
|
|
|
|
if (mode == X86EMUL_MODE_PROT64 && (c->d & Stack))
|
|
c->op_bytes = 8;
|
|
|
|
if (c->d & Op3264) {
|
|
if (mode == X86EMUL_MODE_PROT64)
|
|
c->op_bytes = 8;
|
|
else
|
|
c->op_bytes = 4;
|
|
}
|
|
|
|
if (c->d & Sse)
|
|
c->op_bytes = 16;
|
|
|
|
/* ModRM and SIB bytes. */
|
|
if (c->d & ModRM) {
|
|
rc = decode_modrm(ctxt, ops, &memop);
|
|
if (!c->has_seg_override)
|
|
set_seg_override(c, c->modrm_seg);
|
|
} else if (c->d & MemAbs)
|
|
rc = decode_abs(ctxt, ops, &memop);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
|
|
if (!c->has_seg_override)
|
|
set_seg_override(c, VCPU_SREG_DS);
|
|
|
|
memop.addr.mem.seg = seg_override(ctxt, ops, c);
|
|
|
|
if (memop.type == OP_MEM && c->ad_bytes != 8)
|
|
memop.addr.mem.ea = (u32)memop.addr.mem.ea;
|
|
|
|
if (memop.type == OP_MEM && c->rip_relative)
|
|
memop.addr.mem.ea += c->eip;
|
|
|
|
/*
|
|
* Decode and fetch the source operand: register, memory
|
|
* or immediate.
|
|
*/
|
|
switch (c->d & SrcMask) {
|
|
case SrcNone:
|
|
break;
|
|
case SrcReg:
|
|
decode_register_operand(ctxt, &c->src, c, 0);
|
|
break;
|
|
case SrcMem16:
|
|
memop.bytes = 2;
|
|
goto srcmem_common;
|
|
case SrcMem32:
|
|
memop.bytes = 4;
|
|
goto srcmem_common;
|
|
case SrcMem:
|
|
memop.bytes = (c->d & ByteOp) ? 1 :
|
|
c->op_bytes;
|
|
srcmem_common:
|
|
c->src = memop;
|
|
break;
|
|
case SrcImmU16:
|
|
rc = decode_imm(ctxt, &c->src, 2, false);
|
|
break;
|
|
case SrcImm:
|
|
rc = decode_imm(ctxt, &c->src, imm_size(c), true);
|
|
break;
|
|
case SrcImmU:
|
|
rc = decode_imm(ctxt, &c->src, imm_size(c), false);
|
|
break;
|
|
case SrcImmByte:
|
|
rc = decode_imm(ctxt, &c->src, 1, true);
|
|
break;
|
|
case SrcImmUByte:
|
|
rc = decode_imm(ctxt, &c->src, 1, false);
|
|
break;
|
|
case SrcAcc:
|
|
c->src.type = OP_REG;
|
|
c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
|
|
c->src.addr.reg = &c->regs[VCPU_REGS_RAX];
|
|
fetch_register_operand(&c->src);
|
|
break;
|
|
case SrcOne:
|
|
c->src.bytes = 1;
|
|
c->src.val = 1;
|
|
break;
|
|
case SrcSI:
|
|
c->src.type = OP_MEM;
|
|
c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
|
|
c->src.addr.mem.ea =
|
|
register_address(c, c->regs[VCPU_REGS_RSI]);
|
|
c->src.addr.mem.seg = seg_override(ctxt, ops, c),
|
|
c->src.val = 0;
|
|
break;
|
|
case SrcImmFAddr:
|
|
c->src.type = OP_IMM;
|
|
c->src.addr.mem.ea = c->eip;
|
|
c->src.bytes = c->op_bytes + 2;
|
|
insn_fetch_arr(c->src.valptr, c->src.bytes, c->eip);
|
|
break;
|
|
case SrcMemFAddr:
|
|
memop.bytes = c->op_bytes + 2;
|
|
goto srcmem_common;
|
|
break;
|
|
}
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
|
|
/*
|
|
* Decode and fetch the second source operand: register, memory
|
|
* or immediate.
|
|
*/
|
|
switch (c->d & Src2Mask) {
|
|
case Src2None:
|
|
break;
|
|
case Src2CL:
|
|
c->src2.bytes = 1;
|
|
c->src2.val = c->regs[VCPU_REGS_RCX] & 0x8;
|
|
break;
|
|
case Src2ImmByte:
|
|
rc = decode_imm(ctxt, &c->src2, 1, true);
|
|
break;
|
|
case Src2One:
|
|
c->src2.bytes = 1;
|
|
c->src2.val = 1;
|
|
break;
|
|
case Src2Imm:
|
|
rc = decode_imm(ctxt, &c->src2, imm_size(c), true);
|
|
break;
|
|
}
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
|
|
/* Decode and fetch the destination operand: register or memory. */
|
|
switch (c->d & DstMask) {
|
|
case DstReg:
|
|
decode_register_operand(ctxt, &c->dst, c,
|
|
c->twobyte && (c->b == 0xb6 || c->b == 0xb7));
|
|
break;
|
|
case DstImmUByte:
|
|
c->dst.type = OP_IMM;
|
|
c->dst.addr.mem.ea = c->eip;
|
|
c->dst.bytes = 1;
|
|
c->dst.val = insn_fetch(u8, 1, c->eip);
|
|
break;
|
|
case DstMem:
|
|
case DstMem64:
|
|
c->dst = memop;
|
|
if ((c->d & DstMask) == DstMem64)
|
|
c->dst.bytes = 8;
|
|
else
|
|
c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
|
|
if (c->d & BitOp)
|
|
fetch_bit_operand(c);
|
|
c->dst.orig_val = c->dst.val;
|
|
break;
|
|
case DstAcc:
|
|
c->dst.type = OP_REG;
|
|
c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
|
|
c->dst.addr.reg = &c->regs[VCPU_REGS_RAX];
|
|
fetch_register_operand(&c->dst);
|
|
c->dst.orig_val = c->dst.val;
|
|
break;
|
|
case DstDI:
|
|
c->dst.type = OP_MEM;
|
|
c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
|
|
c->dst.addr.mem.ea =
|
|
register_address(c, c->regs[VCPU_REGS_RDI]);
|
|
c->dst.addr.mem.seg = VCPU_SREG_ES;
|
|
c->dst.val = 0;
|
|
break;
|
|
case ImplicitOps:
|
|
/* Special instructions do their own operand decoding. */
|
|
default:
|
|
c->dst.type = OP_NONE; /* Disable writeback. */
|
|
return 0;
|
|
}
|
|
|
|
done:
|
|
return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
|
|
}
|
|
|
|
static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct decode_cache *c = &ctxt->decode;
|
|
|
|
/* The second termination condition only applies for REPE
|
|
* and REPNE. Test if the repeat string operation prefix is
|
|
* REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
|
|
* corresponding termination condition according to:
|
|
* - if REPE/REPZ and ZF = 0 then done
|
|
* - if REPNE/REPNZ and ZF = 1 then done
|
|
*/
|
|
if (((c->b == 0xa6) || (c->b == 0xa7) ||
|
|
(c->b == 0xae) || (c->b == 0xaf))
|
|
&& (((c->rep_prefix == REPE_PREFIX) &&
|
|
((ctxt->eflags & EFLG_ZF) == 0))
|
|
|| ((c->rep_prefix == REPNE_PREFIX) &&
|
|
((ctxt->eflags & EFLG_ZF) == EFLG_ZF))))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
int
|
|
x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
|
|
{
|
|
struct x86_emulate_ops *ops = ctxt->ops;
|
|
u64 msr_data;
|
|
struct decode_cache *c = &ctxt->decode;
|
|
int rc = X86EMUL_CONTINUE;
|
|
int saved_dst_type = c->dst.type;
|
|
int irq; /* Used for int 3, int, and into */
|
|
|
|
ctxt->decode.mem_read.pos = 0;
|
|
|
|
if (ctxt->mode == X86EMUL_MODE_PROT64 && (c->d & No64)) {
|
|
rc = emulate_ud(ctxt);
|
|
goto done;
|
|
}
|
|
|
|
/* LOCK prefix is allowed only with some instructions */
|
|
if (c->lock_prefix && (!(c->d & Lock) || c->dst.type != OP_MEM)) {
|
|
rc = emulate_ud(ctxt);
|
|
goto done;
|
|
}
|
|
|
|
if ((c->d & SrcMask) == SrcMemFAddr && c->src.type != OP_MEM) {
|
|
rc = emulate_ud(ctxt);
|
|
goto done;
|
|
}
|
|
|
|
if ((c->d & Sse)
|
|
&& ((ops->get_cr(0, ctxt->vcpu) & X86_CR0_EM)
|
|
|| !(ops->get_cr(4, ctxt->vcpu) & X86_CR4_OSFXSR))) {
|
|
rc = emulate_ud(ctxt);
|
|
goto done;
|
|
}
|
|
|
|
if ((c->d & Sse) && (ops->get_cr(0, ctxt->vcpu) & X86_CR0_TS)) {
|
|
rc = emulate_nm(ctxt);
|
|
goto done;
|
|
}
|
|
|
|
if (unlikely(ctxt->guest_mode) && c->intercept) {
|
|
rc = emulator_check_intercept(ctxt, c->intercept,
|
|
X86_ICPT_PRE_EXCEPT);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
}
|
|
|
|
/* Privileged instruction can be executed only in CPL=0 */
|
|
if ((c->d & Priv) && ops->cpl(ctxt->vcpu)) {
|
|
rc = emulate_gp(ctxt, 0);
|
|
goto done;
|
|
}
|
|
|
|
/* Instruction can only be executed in protected mode */
|
|
if ((c->d & Prot) && !(ctxt->mode & X86EMUL_MODE_PROT)) {
|
|
rc = emulate_ud(ctxt);
|
|
goto done;
|
|
}
|
|
|
|
/* Do instruction specific permission checks */
|
|
if (c->check_perm) {
|
|
rc = c->check_perm(ctxt);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
}
|
|
|
|
if (unlikely(ctxt->guest_mode) && c->intercept) {
|
|
rc = emulator_check_intercept(ctxt, c->intercept,
|
|
X86_ICPT_POST_EXCEPT);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
}
|
|
|
|
if (c->rep_prefix && (c->d & String)) {
|
|
/* All REP prefixes have the same first termination condition */
|
|
if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) {
|
|
ctxt->eip = c->eip;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if ((c->src.type == OP_MEM) && !(c->d & NoAccess)) {
|
|
rc = segmented_read(ctxt, c->src.addr.mem,
|
|
c->src.valptr, c->src.bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
c->src.orig_val64 = c->src.val64;
|
|
}
|
|
|
|
if (c->src2.type == OP_MEM) {
|
|
rc = segmented_read(ctxt, c->src2.addr.mem,
|
|
&c->src2.val, c->src2.bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
}
|
|
|
|
if ((c->d & DstMask) == ImplicitOps)
|
|
goto special_insn;
|
|
|
|
|
|
if ((c->dst.type == OP_MEM) && !(c->d & Mov)) {
|
|
/* optimisation - avoid slow emulated read if Mov */
|
|
rc = segmented_read(ctxt, c->dst.addr.mem,
|
|
&c->dst.val, c->dst.bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
}
|
|
c->dst.orig_val = c->dst.val;
|
|
|
|
special_insn:
|
|
|
|
if (unlikely(ctxt->guest_mode) && c->intercept) {
|
|
rc = emulator_check_intercept(ctxt, c->intercept,
|
|
X86_ICPT_POST_MEMACCESS);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
}
|
|
|
|
if (c->execute) {
|
|
rc = c->execute(ctxt);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
goto writeback;
|
|
}
|
|
|
|
if (c->twobyte)
|
|
goto twobyte_insn;
|
|
|
|
switch (c->b) {
|
|
case 0x00 ... 0x05:
|
|
add: /* add */
|
|
emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x06: /* push es */
|
|
emulate_push_sreg(ctxt, ops, VCPU_SREG_ES);
|
|
break;
|
|
case 0x07: /* pop es */
|
|
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES);
|
|
break;
|
|
case 0x08 ... 0x0d:
|
|
or: /* or */
|
|
emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x0e: /* push cs */
|
|
emulate_push_sreg(ctxt, ops, VCPU_SREG_CS);
|
|
break;
|
|
case 0x10 ... 0x15:
|
|
adc: /* adc */
|
|
emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x16: /* push ss */
|
|
emulate_push_sreg(ctxt, ops, VCPU_SREG_SS);
|
|
break;
|
|
case 0x17: /* pop ss */
|
|
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS);
|
|
break;
|
|
case 0x18 ... 0x1d:
|
|
sbb: /* sbb */
|
|
emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x1e: /* push ds */
|
|
emulate_push_sreg(ctxt, ops, VCPU_SREG_DS);
|
|
break;
|
|
case 0x1f: /* pop ds */
|
|
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS);
|
|
break;
|
|
case 0x20 ... 0x25:
|
|
and: /* and */
|
|
emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x28 ... 0x2d:
|
|
sub: /* sub */
|
|
emulate_2op_SrcV("sub", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x30 ... 0x35:
|
|
xor: /* xor */
|
|
emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x38 ... 0x3d:
|
|
cmp: /* cmp */
|
|
c->dst.type = OP_NONE; /* Disable writeback. */
|
|
emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x40 ... 0x47: /* inc r16/r32 */
|
|
emulate_1op("inc", c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x48 ... 0x4f: /* dec r16/r32 */
|
|
emulate_1op("dec", c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x58 ... 0x5f: /* pop reg */
|
|
pop_instruction:
|
|
rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
|
|
break;
|
|
case 0x60: /* pusha */
|
|
rc = emulate_pusha(ctxt, ops);
|
|
break;
|
|
case 0x61: /* popa */
|
|
rc = emulate_popa(ctxt, ops);
|
|
break;
|
|
case 0x63: /* movsxd */
|
|
if (ctxt->mode != X86EMUL_MODE_PROT64)
|
|
goto cannot_emulate;
|
|
c->dst.val = (s32) c->src.val;
|
|
break;
|
|
case 0x6c: /* insb */
|
|
case 0x6d: /* insw/insd */
|
|
c->src.val = c->regs[VCPU_REGS_RDX];
|
|
goto do_io_in;
|
|
case 0x6e: /* outsb */
|
|
case 0x6f: /* outsw/outsd */
|
|
c->dst.val = c->regs[VCPU_REGS_RDX];
|
|
goto do_io_out;
|
|
break;
|
|
case 0x70 ... 0x7f: /* jcc (short) */
|
|
if (test_cc(c->b, ctxt->eflags))
|
|
jmp_rel(c, c->src.val);
|
|
break;
|
|
case 0x80 ... 0x83: /* Grp1 */
|
|
switch (c->modrm_reg) {
|
|
case 0:
|
|
goto add;
|
|
case 1:
|
|
goto or;
|
|
case 2:
|
|
goto adc;
|
|
case 3:
|
|
goto sbb;
|
|
case 4:
|
|
goto and;
|
|
case 5:
|
|
goto sub;
|
|
case 6:
|
|
goto xor;
|
|
case 7:
|
|
goto cmp;
|
|
}
|
|
break;
|
|
case 0x84 ... 0x85:
|
|
test:
|
|
emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0x86 ... 0x87: /* xchg */
|
|
xchg:
|
|
/* Write back the register source. */
|
|
c->src.val = c->dst.val;
|
|
write_register_operand(&c->src);
|
|
/*
|
|
* Write back the memory destination with implicit LOCK
|
|
* prefix.
|
|
*/
|
|
c->dst.val = c->src.orig_val;
|
|
c->lock_prefix = 1;
|
|
break;
|
|
case 0x8c: /* mov r/m, sreg */
|
|
if (c->modrm_reg > VCPU_SREG_GS) {
|
|
rc = emulate_ud(ctxt);
|
|
goto done;
|
|
}
|
|
c->dst.val = ops->get_segment_selector(c->modrm_reg, ctxt->vcpu);
|
|
break;
|
|
case 0x8d: /* lea r16/r32, m */
|
|
c->dst.val = c->src.addr.mem.ea;
|
|
break;
|
|
case 0x8e: { /* mov seg, r/m16 */
|
|
uint16_t sel;
|
|
|
|
sel = c->src.val;
|
|
|
|
if (c->modrm_reg == VCPU_SREG_CS ||
|
|
c->modrm_reg > VCPU_SREG_GS) {
|
|
rc = emulate_ud(ctxt);
|
|
goto done;
|
|
}
|
|
|
|
if (c->modrm_reg == VCPU_SREG_SS)
|
|
ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
|
|
|
|
rc = load_segment_descriptor(ctxt, ops, sel, c->modrm_reg);
|
|
|
|
c->dst.type = OP_NONE; /* Disable writeback. */
|
|
break;
|
|
}
|
|
case 0x8f: /* pop (sole member of Grp1a) */
|
|
rc = emulate_grp1a(ctxt, ops);
|
|
break;
|
|
case 0x90 ... 0x97: /* nop / xchg reg, rax */
|
|
if (c->dst.addr.reg == &c->regs[VCPU_REGS_RAX])
|
|
break;
|
|
goto xchg;
|
|
case 0x98: /* cbw/cwde/cdqe */
|
|
switch (c->op_bytes) {
|
|
case 2: c->dst.val = (s8)c->dst.val; break;
|
|
case 4: c->dst.val = (s16)c->dst.val; break;
|
|
case 8: c->dst.val = (s32)c->dst.val; break;
|
|
}
|
|
break;
|
|
case 0x9c: /* pushf */
|
|
c->src.val = (unsigned long) ctxt->eflags;
|
|
emulate_push(ctxt, ops);
|
|
break;
|
|
case 0x9d: /* popf */
|
|
c->dst.type = OP_REG;
|
|
c->dst.addr.reg = &ctxt->eflags;
|
|
c->dst.bytes = c->op_bytes;
|
|
rc = emulate_popf(ctxt, ops, &c->dst.val, c->op_bytes);
|
|
break;
|
|
case 0xa6 ... 0xa7: /* cmps */
|
|
goto cmp;
|
|
case 0xa8 ... 0xa9: /* test ax, imm */
|
|
goto test;
|
|
case 0xae ... 0xaf: /* scas */
|
|
goto cmp;
|
|
case 0xc0 ... 0xc1:
|
|
emulate_grp2(ctxt);
|
|
break;
|
|
case 0xc3: /* ret */
|
|
c->dst.type = OP_REG;
|
|
c->dst.addr.reg = &c->eip;
|
|
c->dst.bytes = c->op_bytes;
|
|
goto pop_instruction;
|
|
case 0xc4: /* les */
|
|
rc = emulate_load_segment(ctxt, ops, VCPU_SREG_ES);
|
|
break;
|
|
case 0xc5: /* lds */
|
|
rc = emulate_load_segment(ctxt, ops, VCPU_SREG_DS);
|
|
break;
|
|
case 0xcb: /* ret far */
|
|
rc = emulate_ret_far(ctxt, ops);
|
|
break;
|
|
case 0xcc: /* int3 */
|
|
irq = 3;
|
|
goto do_interrupt;
|
|
case 0xcd: /* int n */
|
|
irq = c->src.val;
|
|
do_interrupt:
|
|
rc = emulate_int(ctxt, ops, irq);
|
|
break;
|
|
case 0xce: /* into */
|
|
if (ctxt->eflags & EFLG_OF) {
|
|
irq = 4;
|
|
goto do_interrupt;
|
|
}
|
|
break;
|
|
case 0xcf: /* iret */
|
|
rc = emulate_iret(ctxt, ops);
|
|
break;
|
|
case 0xd0 ... 0xd1: /* Grp2 */
|
|
emulate_grp2(ctxt);
|
|
break;
|
|
case 0xd2 ... 0xd3: /* Grp2 */
|
|
c->src.val = c->regs[VCPU_REGS_RCX];
|
|
emulate_grp2(ctxt);
|
|
break;
|
|
case 0xe0 ... 0xe2: /* loop/loopz/loopnz */
|
|
register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
|
|
if (address_mask(c, c->regs[VCPU_REGS_RCX]) != 0 &&
|
|
(c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags)))
|
|
jmp_rel(c, c->src.val);
|
|
break;
|
|
case 0xe3: /* jcxz/jecxz/jrcxz */
|
|
if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)
|
|
jmp_rel(c, c->src.val);
|
|
break;
|
|
case 0xe4: /* inb */
|
|
case 0xe5: /* in */
|
|
goto do_io_in;
|
|
case 0xe6: /* outb */
|
|
case 0xe7: /* out */
|
|
goto do_io_out;
|
|
case 0xe8: /* call (near) */ {
|
|
long int rel = c->src.val;
|
|
c->src.val = (unsigned long) c->eip;
|
|
jmp_rel(c, rel);
|
|
emulate_push(ctxt, ops);
|
|
break;
|
|
}
|
|
case 0xe9: /* jmp rel */
|
|
goto jmp;
|
|
case 0xea: { /* jmp far */
|
|
unsigned short sel;
|
|
jump_far:
|
|
memcpy(&sel, c->src.valptr + c->op_bytes, 2);
|
|
|
|
if (load_segment_descriptor(ctxt, ops, sel, VCPU_SREG_CS))
|
|
goto done;
|
|
|
|
c->eip = 0;
|
|
memcpy(&c->eip, c->src.valptr, c->op_bytes);
|
|
break;
|
|
}
|
|
case 0xeb:
|
|
jmp: /* jmp rel short */
|
|
jmp_rel(c, c->src.val);
|
|
c->dst.type = OP_NONE; /* Disable writeback. */
|
|
break;
|
|
case 0xec: /* in al,dx */
|
|
case 0xed: /* in (e/r)ax,dx */
|
|
c->src.val = c->regs[VCPU_REGS_RDX];
|
|
do_io_in:
|
|
if (!pio_in_emulated(ctxt, ops, c->dst.bytes, c->src.val,
|
|
&c->dst.val))
|
|
goto done; /* IO is needed */
|
|
break;
|
|
case 0xee: /* out dx,al */
|
|
case 0xef: /* out dx,(e/r)ax */
|
|
c->dst.val = c->regs[VCPU_REGS_RDX];
|
|
do_io_out:
|
|
ops->pio_out_emulated(c->src.bytes, c->dst.val,
|
|
&c->src.val, 1, ctxt->vcpu);
|
|
c->dst.type = OP_NONE; /* Disable writeback. */
|
|
break;
|
|
case 0xf4: /* hlt */
|
|
ctxt->vcpu->arch.halt_request = 1;
|
|
break;
|
|
case 0xf5: /* cmc */
|
|
/* complement carry flag from eflags reg */
|
|
ctxt->eflags ^= EFLG_CF;
|
|
break;
|
|
case 0xf6 ... 0xf7: /* Grp3 */
|
|
rc = emulate_grp3(ctxt, ops);
|
|
break;
|
|
case 0xf8: /* clc */
|
|
ctxt->eflags &= ~EFLG_CF;
|
|
break;
|
|
case 0xf9: /* stc */
|
|
ctxt->eflags |= EFLG_CF;
|
|
break;
|
|
case 0xfa: /* cli */
|
|
if (emulator_bad_iopl(ctxt, ops)) {
|
|
rc = emulate_gp(ctxt, 0);
|
|
goto done;
|
|
} else
|
|
ctxt->eflags &= ~X86_EFLAGS_IF;
|
|
break;
|
|
case 0xfb: /* sti */
|
|
if (emulator_bad_iopl(ctxt, ops)) {
|
|
rc = emulate_gp(ctxt, 0);
|
|
goto done;
|
|
} else {
|
|
ctxt->interruptibility = KVM_X86_SHADOW_INT_STI;
|
|
ctxt->eflags |= X86_EFLAGS_IF;
|
|
}
|
|
break;
|
|
case 0xfc: /* cld */
|
|
ctxt->eflags &= ~EFLG_DF;
|
|
break;
|
|
case 0xfd: /* std */
|
|
ctxt->eflags |= EFLG_DF;
|
|
break;
|
|
case 0xfe: /* Grp4 */
|
|
grp45:
|
|
rc = emulate_grp45(ctxt, ops);
|
|
break;
|
|
case 0xff: /* Grp5 */
|
|
if (c->modrm_reg == 5)
|
|
goto jump_far;
|
|
goto grp45;
|
|
default:
|
|
goto cannot_emulate;
|
|
}
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
|
|
writeback:
|
|
rc = writeback(ctxt, ops);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
|
|
/*
|
|
* restore dst type in case the decoding will be reused
|
|
* (happens for string instruction )
|
|
*/
|
|
c->dst.type = saved_dst_type;
|
|
|
|
if ((c->d & SrcMask) == SrcSI)
|
|
string_addr_inc(ctxt, seg_override(ctxt, ops, c),
|
|
VCPU_REGS_RSI, &c->src);
|
|
|
|
if ((c->d & DstMask) == DstDI)
|
|
string_addr_inc(ctxt, VCPU_SREG_ES, VCPU_REGS_RDI,
|
|
&c->dst);
|
|
|
|
if (c->rep_prefix && (c->d & String)) {
|
|
struct read_cache *r = &ctxt->decode.io_read;
|
|
register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
|
|
|
|
if (!string_insn_completed(ctxt)) {
|
|
/*
|
|
* Re-enter guest when pio read ahead buffer is empty
|
|
* or, if it is not used, after each 1024 iteration.
|
|
*/
|
|
if ((r->end != 0 || c->regs[VCPU_REGS_RCX] & 0x3ff) &&
|
|
(r->end == 0 || r->end != r->pos)) {
|
|
/*
|
|
* Reset read cache. Usually happens before
|
|
* decode, but since instruction is restarted
|
|
* we have to do it here.
|
|
*/
|
|
ctxt->decode.mem_read.end = 0;
|
|
return EMULATION_RESTART;
|
|
}
|
|
goto done; /* skip rip writeback */
|
|
}
|
|
}
|
|
|
|
ctxt->eip = c->eip;
|
|
|
|
done:
|
|
if (rc == X86EMUL_PROPAGATE_FAULT)
|
|
ctxt->have_exception = true;
|
|
if (rc == X86EMUL_INTERCEPTED)
|
|
return EMULATION_INTERCEPTED;
|
|
|
|
return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
|
|
|
|
twobyte_insn:
|
|
switch (c->b) {
|
|
case 0x01: /* lgdt, lidt, lmsw */
|
|
switch (c->modrm_reg) {
|
|
u16 size;
|
|
unsigned long address;
|
|
|
|
case 0: /* vmcall */
|
|
if (c->modrm_mod != 3 || c->modrm_rm != 1)
|
|
goto cannot_emulate;
|
|
|
|
rc = kvm_fix_hypercall(ctxt->vcpu);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
|
|
/* Let the processor re-execute the fixed hypercall */
|
|
c->eip = ctxt->eip;
|
|
/* Disable writeback. */
|
|
c->dst.type = OP_NONE;
|
|
break;
|
|
case 2: /* lgdt */
|
|
rc = read_descriptor(ctxt, ops, c->src.addr.mem,
|
|
&size, &address, c->op_bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
realmode_lgdt(ctxt->vcpu, size, address);
|
|
/* Disable writeback. */
|
|
c->dst.type = OP_NONE;
|
|
break;
|
|
case 3: /* lidt/vmmcall */
|
|
if (c->modrm_mod == 3) {
|
|
switch (c->modrm_rm) {
|
|
case 1:
|
|
rc = kvm_fix_hypercall(ctxt->vcpu);
|
|
break;
|
|
default:
|
|
goto cannot_emulate;
|
|
}
|
|
} else {
|
|
rc = read_descriptor(ctxt, ops, c->src.addr.mem,
|
|
&size, &address,
|
|
c->op_bytes);
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
realmode_lidt(ctxt->vcpu, size, address);
|
|
}
|
|
/* Disable writeback. */
|
|
c->dst.type = OP_NONE;
|
|
break;
|
|
case 4: /* smsw */
|
|
c->dst.bytes = 2;
|
|
c->dst.val = ops->get_cr(0, ctxt->vcpu);
|
|
break;
|
|
case 6: /* lmsw */
|
|
ops->set_cr(0, (ops->get_cr(0, ctxt->vcpu) & ~0x0eul) |
|
|
(c->src.val & 0x0f), ctxt->vcpu);
|
|
c->dst.type = OP_NONE;
|
|
break;
|
|
case 5: /* not defined */
|
|
emulate_ud(ctxt);
|
|
rc = X86EMUL_PROPAGATE_FAULT;
|
|
goto done;
|
|
case 7: /* invlpg*/
|
|
rc = em_invlpg(ctxt);
|
|
break;
|
|
default:
|
|
goto cannot_emulate;
|
|
}
|
|
break;
|
|
case 0x05: /* syscall */
|
|
rc = emulate_syscall(ctxt, ops);
|
|
break;
|
|
case 0x06:
|
|
emulate_clts(ctxt->vcpu);
|
|
break;
|
|
case 0x09: /* wbinvd */
|
|
kvm_emulate_wbinvd(ctxt->vcpu);
|
|
break;
|
|
case 0x08: /* invd */
|
|
case 0x0d: /* GrpP (prefetch) */
|
|
case 0x18: /* Grp16 (prefetch/nop) */
|
|
break;
|
|
case 0x20: /* mov cr, reg */
|
|
c->dst.val = ops->get_cr(c->modrm_reg, ctxt->vcpu);
|
|
break;
|
|
case 0x21: /* mov from dr to reg */
|
|
ops->get_dr(c->modrm_reg, &c->dst.val, ctxt->vcpu);
|
|
break;
|
|
case 0x22: /* mov reg, cr */
|
|
if (ops->set_cr(c->modrm_reg, c->src.val, ctxt->vcpu)) {
|
|
emulate_gp(ctxt, 0);
|
|
rc = X86EMUL_PROPAGATE_FAULT;
|
|
goto done;
|
|
}
|
|
c->dst.type = OP_NONE;
|
|
break;
|
|
case 0x23: /* mov from reg to dr */
|
|
if (ops->set_dr(c->modrm_reg, c->src.val &
|
|
((ctxt->mode == X86EMUL_MODE_PROT64) ?
|
|
~0ULL : ~0U), ctxt->vcpu) < 0) {
|
|
/* #UD condition is already handled by the code above */
|
|
emulate_gp(ctxt, 0);
|
|
rc = X86EMUL_PROPAGATE_FAULT;
|
|
goto done;
|
|
}
|
|
|
|
c->dst.type = OP_NONE; /* no writeback */
|
|
break;
|
|
case 0x30:
|
|
/* wrmsr */
|
|
msr_data = (u32)c->regs[VCPU_REGS_RAX]
|
|
| ((u64)c->regs[VCPU_REGS_RDX] << 32);
|
|
if (ops->set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data)) {
|
|
emulate_gp(ctxt, 0);
|
|
rc = X86EMUL_PROPAGATE_FAULT;
|
|
goto done;
|
|
}
|
|
rc = X86EMUL_CONTINUE;
|
|
break;
|
|
case 0x32:
|
|
/* rdmsr */
|
|
if (ops->get_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], &msr_data)) {
|
|
emulate_gp(ctxt, 0);
|
|
rc = X86EMUL_PROPAGATE_FAULT;
|
|
goto done;
|
|
} else {
|
|
c->regs[VCPU_REGS_RAX] = (u32)msr_data;
|
|
c->regs[VCPU_REGS_RDX] = msr_data >> 32;
|
|
}
|
|
rc = X86EMUL_CONTINUE;
|
|
break;
|
|
case 0x34: /* sysenter */
|
|
rc = emulate_sysenter(ctxt, ops);
|
|
break;
|
|
case 0x35: /* sysexit */
|
|
rc = emulate_sysexit(ctxt, ops);
|
|
break;
|
|
case 0x40 ... 0x4f: /* cmov */
|
|
c->dst.val = c->dst.orig_val = c->src.val;
|
|
if (!test_cc(c->b, ctxt->eflags))
|
|
c->dst.type = OP_NONE; /* no writeback */
|
|
break;
|
|
case 0x80 ... 0x8f: /* jnz rel, etc*/
|
|
if (test_cc(c->b, ctxt->eflags))
|
|
jmp_rel(c, c->src.val);
|
|
break;
|
|
case 0x90 ... 0x9f: /* setcc r/m8 */
|
|
c->dst.val = test_cc(c->b, ctxt->eflags);
|
|
break;
|
|
case 0xa0: /* push fs */
|
|
emulate_push_sreg(ctxt, ops, VCPU_SREG_FS);
|
|
break;
|
|
case 0xa1: /* pop fs */
|
|
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS);
|
|
break;
|
|
case 0xa3:
|
|
bt: /* bt */
|
|
c->dst.type = OP_NONE;
|
|
/* only subword offset */
|
|
c->src.val &= (c->dst.bytes << 3) - 1;
|
|
emulate_2op_SrcV_nobyte("bt", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0xa4: /* shld imm8, r, r/m */
|
|
case 0xa5: /* shld cl, r, r/m */
|
|
emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0xa8: /* push gs */
|
|
emulate_push_sreg(ctxt, ops, VCPU_SREG_GS);
|
|
break;
|
|
case 0xa9: /* pop gs */
|
|
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS);
|
|
break;
|
|
case 0xab:
|
|
bts: /* bts */
|
|
emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0xac: /* shrd imm8, r, r/m */
|
|
case 0xad: /* shrd cl, r, r/m */
|
|
emulate_2op_cl("shrd", c->src2, c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0xae: /* clflush */
|
|
break;
|
|
case 0xb0 ... 0xb1: /* cmpxchg */
|
|
/*
|
|
* Save real source value, then compare EAX against
|
|
* destination.
|
|
*/
|
|
c->src.orig_val = c->src.val;
|
|
c->src.val = c->regs[VCPU_REGS_RAX];
|
|
emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
|
|
if (ctxt->eflags & EFLG_ZF) {
|
|
/* Success: write back to memory. */
|
|
c->dst.val = c->src.orig_val;
|
|
} else {
|
|
/* Failure: write the value we saw to EAX. */
|
|
c->dst.type = OP_REG;
|
|
c->dst.addr.reg = (unsigned long *)&c->regs[VCPU_REGS_RAX];
|
|
}
|
|
break;
|
|
case 0xb2: /* lss */
|
|
rc = emulate_load_segment(ctxt, ops, VCPU_SREG_SS);
|
|
break;
|
|
case 0xb3:
|
|
btr: /* btr */
|
|
emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0xb4: /* lfs */
|
|
rc = emulate_load_segment(ctxt, ops, VCPU_SREG_FS);
|
|
break;
|
|
case 0xb5: /* lgs */
|
|
rc = emulate_load_segment(ctxt, ops, VCPU_SREG_GS);
|
|
break;
|
|
case 0xb6 ... 0xb7: /* movzx */
|
|
c->dst.bytes = c->op_bytes;
|
|
c->dst.val = (c->d & ByteOp) ? (u8) c->src.val
|
|
: (u16) c->src.val;
|
|
break;
|
|
case 0xba: /* Grp8 */
|
|
switch (c->modrm_reg & 3) {
|
|
case 0:
|
|
goto bt;
|
|
case 1:
|
|
goto bts;
|
|
case 2:
|
|
goto btr;
|
|
case 3:
|
|
goto btc;
|
|
}
|
|
break;
|
|
case 0xbb:
|
|
btc: /* btc */
|
|
emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags);
|
|
break;
|
|
case 0xbc: { /* bsf */
|
|
u8 zf;
|
|
__asm__ ("bsf %2, %0; setz %1"
|
|
: "=r"(c->dst.val), "=q"(zf)
|
|
: "r"(c->src.val));
|
|
ctxt->eflags &= ~X86_EFLAGS_ZF;
|
|
if (zf) {
|
|
ctxt->eflags |= X86_EFLAGS_ZF;
|
|
c->dst.type = OP_NONE; /* Disable writeback. */
|
|
}
|
|
break;
|
|
}
|
|
case 0xbd: { /* bsr */
|
|
u8 zf;
|
|
__asm__ ("bsr %2, %0; setz %1"
|
|
: "=r"(c->dst.val), "=q"(zf)
|
|
: "r"(c->src.val));
|
|
ctxt->eflags &= ~X86_EFLAGS_ZF;
|
|
if (zf) {
|
|
ctxt->eflags |= X86_EFLAGS_ZF;
|
|
c->dst.type = OP_NONE; /* Disable writeback. */
|
|
}
|
|
break;
|
|
}
|
|
case 0xbe ... 0xbf: /* movsx */
|
|
c->dst.bytes = c->op_bytes;
|
|
c->dst.val = (c->d & ByteOp) ? (s8) c->src.val :
|
|
(s16) c->src.val;
|
|
break;
|
|
case 0xc0 ... 0xc1: /* xadd */
|
|
emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
|
|
/* Write back the register source. */
|
|
c->src.val = c->dst.orig_val;
|
|
write_register_operand(&c->src);
|
|
break;
|
|
case 0xc3: /* movnti */
|
|
c->dst.bytes = c->op_bytes;
|
|
c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val :
|
|
(u64) c->src.val;
|
|
break;
|
|
case 0xc7: /* Grp9 (cmpxchg8b) */
|
|
rc = emulate_grp9(ctxt, ops);
|
|
break;
|
|
default:
|
|
goto cannot_emulate;
|
|
}
|
|
|
|
if (rc != X86EMUL_CONTINUE)
|
|
goto done;
|
|
|
|
goto writeback;
|
|
|
|
cannot_emulate:
|
|
return EMULATION_FAILED;
|
|
}
|