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f438d914b2
Introduce architecture dependent kretprobe blacklists to prohibit users from inserting return probes on the function in which kprobes can be inserted but kretprobes can not. This patch also removes "__kprobes" mark from "__switch_to" on x86_64 and registers "__switch_to" to the blacklist on x86-64, because that mark is to prohibit user from inserting only kretprobe. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
#ifndef _ASM_KPROBES_H
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#define _ASM_KPROBES_H
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/*
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* Kernel Probes (KProbes)
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* include/asm-ia64/kprobes.h
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2002, 2004
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* Copyright (C) Intel Corporation, 2005
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*
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* 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
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* <anil.s.keshavamurthy@intel.com> adapted from i386
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*/
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/percpu.h>
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#include <asm/break.h>
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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#define MAX_INSN_SIZE 1
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#define BREAK_INST (long)(__IA64_BREAK_KPROBE << 6)
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typedef union cmp_inst {
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struct {
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unsigned long long qp : 6;
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unsigned long long p1 : 6;
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unsigned long long c : 1;
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unsigned long long r2 : 7;
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unsigned long long r3 : 7;
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unsigned long long p2 : 6;
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unsigned long long ta : 1;
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unsigned long long x2 : 2;
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unsigned long long tb : 1;
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unsigned long long opcode : 4;
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unsigned long long reserved : 23;
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}f;
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unsigned long long l;
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} cmp_inst_t;
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struct kprobe;
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typedef struct _bundle {
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struct {
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unsigned long long template : 5;
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unsigned long long slot0 : 41;
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unsigned long long slot1_p0 : 64-46;
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} quad0;
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struct {
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unsigned long long slot1_p1 : 41 - (64-46);
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unsigned long long slot2 : 41;
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} quad1;
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} __attribute__((__aligned__(16))) bundle_t;
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struct prev_kprobe {
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struct kprobe *kp;
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unsigned long status;
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};
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#define MAX_PARAM_RSE_SIZE (0x60+0x60/0x3f)
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/* per-cpu kprobe control block */
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#define ARCH_PREV_KPROBE_SZ 2
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struct kprobe_ctlblk {
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unsigned long kprobe_status;
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struct pt_regs jprobe_saved_regs;
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unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
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unsigned long *bsp;
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unsigned long cfm;
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atomic_t prev_kprobe_index;
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struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
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};
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#define ARCH_SUPPORTS_KRETPROBES
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#define kretprobe_blacklist_size 0
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#define SLOT0_OPCODE_SHIFT (37)
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#define SLOT1_p1_OPCODE_SHIFT (37 - (64-46))
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#define SLOT2_OPCODE_SHIFT (37)
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#define INDIRECT_CALL_OPCODE (1)
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#define IP_RELATIVE_CALL_OPCODE (5)
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#define IP_RELATIVE_BRANCH_OPCODE (4)
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#define IP_RELATIVE_PREDICT_OPCODE (7)
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#define LONG_BRANCH_OPCODE (0xC)
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#define LONG_CALL_OPCODE (0xD)
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#define flush_insn_slot(p) do { } while (0)
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typedef struct kprobe_opcode {
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bundle_t bundle;
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} kprobe_opcode_t;
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struct fnptr {
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unsigned long ip;
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unsigned long gp;
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};
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/* Architecture specific copy of original instruction*/
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struct arch_specific_insn {
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/* copy of the instruction to be emulated */
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kprobe_opcode_t *insn;
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#define INST_FLAG_FIX_RELATIVE_IP_ADDR 1
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#define INST_FLAG_FIX_BRANCH_REG 2
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#define INST_FLAG_BREAK_INST 4
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unsigned long inst_flag;
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unsigned short target_br_reg;
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unsigned short slot;
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};
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extern int kprobes_fault_handler(struct pt_regs *regs, int trapnr);
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extern int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data);
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/* ia64 does not need this */
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static inline void jprobe_return(void)
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{
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}
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extern void invalidate_stacked_regs(void);
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extern void flush_register_stack(void);
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extern void arch_remove_kprobe(struct kprobe *p);
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#endif /* _ASM_KPROBES_H */
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