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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5b3efd5008
Add the xstate regset support which helps extend the kernel ptrace and the core-dump interfaces to support AVX state etc. This regset interface is designed to support all the future state that gets supported using xsave/xrstor infrastructure. Looking at the memory layout saved by "xsave", one can't say which state is represented in the memory layout. This is because if a particular state is in init state, in the xsave hdr it can be represented by bit '0'. And hence we can't really say by the xsave header wether a state is in init state or the state is not saved in the memory layout. And hence the xsave memory layout available through this regset interface uses SW usable bytes [464..511] to convey what state is represented in the memory layout. First 8 bytes of the sw_usable_bytes[464..467] will be set to OS enabled xstate mask(which is same as the 64bit mask returned by the xgetbv's xCR0). The note NT_X86_XSTATE represents the extended state information in the core file, using the above mentioned memory layout. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20100211195614.802495327@sbs-t61.sc.intel.com> Signed-off-by: Hongjiu Lu <hjl.tools@gmail.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
#ifndef _ASM_X86_USER_H
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#define _ASM_X86_USER_H
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#ifdef CONFIG_X86_32
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# include "user_32.h"
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#else
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# include "user_64.h"
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#endif
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#include <asm/types.h>
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struct user_ymmh_regs {
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/* 16 * 16 bytes for each YMMH-reg */
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__u32 ymmh_space[64];
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};
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struct user_xsave_hdr {
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__u64 xstate_bv;
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__u64 reserved1[2];
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__u64 reserved2[5];
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};
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/*
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* The structure layout of user_xstateregs, used for exporting the
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* extended register state through ptrace and core-dump (NT_X86_XSTATE note)
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* interfaces will be same as the memory layout of xsave used by the processor
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* (except for the bytes 464..511, which can be used by the software) and hence
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* the size of this structure varies depending on the features supported by the
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* processor and OS. The size of the structure that users need to use can be
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* obtained by doing:
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* cpuid_count(0xd, 0, &eax, &ptrace_xstateregs_struct_size, &ecx, &edx);
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* i.e., cpuid.(eax=0xd,ecx=0).ebx will be the size that user (debuggers, etc.)
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* need to use.
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*
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* For now, only the first 8 bytes of the software usable bytes[464..471] will
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* be used and will be set to OS enabled xstate mask (which is same as the
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* 64bit mask returned by the xgetbv's xCR0). Users (analyzing core dump
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* remotely, etc.) can use this mask as well as the mask saved in the
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* xstate_hdr bytes and interpret what states the processor/OS supports
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* and what states are in modified/initialized conditions for the
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* particular process/thread.
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*
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* Also when the user modifies certain state FP/SSE/etc through the
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* ptrace interface, they must ensure that the xsave_hdr.xstate_bv
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* bytes[512..519] of the memory layout are updated correspondingly.
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* i.e., for example when FP state is modified to a non-init state,
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* xsave_hdr.xstate_bv's bit 0 must be set to '1', when SSE is modified to
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* non-init state, xsave_hdr.xstate_bv's bit 1 must to be set to '1', etc.
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*/
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#define USER_XSTATE_FX_SW_WORDS 6
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#define USER_XSTATE_XCR0_WORD 0
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struct user_xstateregs {
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struct {
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__u64 fpx_space[58];
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__u64 xstate_fx_sw[USER_XSTATE_FX_SW_WORDS];
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} i387;
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struct user_xsave_hdr xsave_hdr;
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struct user_ymmh_regs ymmh;
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/* further processor state extensions go here */
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};
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#endif /* _ASM_X86_USER_H */
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