LXR linux/arch/x86/include/asm/kprobes.h

   1#ifndef _ASM_X86_KPROBES_H
   2#define _ASM_X86_KPROBES_H
   3/*
   4 *  Kernel Probes (KProbes)
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 *
  20 * Copyright (C) IBM Corporation, 2002, 2004
  21 *
  22 * See arch/x86/kernel/kprobes.c for x86 kprobes history.
  23 */
  24#include <linux/types.h>
  25#include <linux/ptrace.h>
  26#include <linux/percpu.h>
  27
  28#define  __ARCH_WANT_KPROBES_INSN_SLOT
  29
  30struct pt_regs;
  31struct kprobe;
  32
  33typedef u8 kprobe_opcode_t;
  34#define BREAKPOINT_INSTRUCTION  0xcc
  35#define RELATIVEJUMP_INSTRUCTION 0xe9
  36#define MAX_INSN_SIZE 16
  37#define MAX_STACK_SIZE 64
  38#define MIN_STACK_SIZE(ADDR)                                           \
  39        (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \
  40                              THREAD_SIZE - (unsigned long)(ADDR)))    \
  41         ? (MAX_STACK_SIZE)                                            \
  42         : (((unsigned long)current_thread_info()) +                   \
  43            THREAD_SIZE - (unsigned long)(ADDR)))
  44
  45#define flush_insn_slot(p)      do { } while (0)
  46
  47extern const int kretprobe_blacklist_size;
  48
  49void arch_remove_kprobe(struct kprobe *p);
  50void kretprobe_trampoline(void);
  51
  52/* Architecture specific copy of original instruction*/
  53struct arch_specific_insn {
  54        /* copy of the original instruction */
  55        kprobe_opcode_t *insn;
  56        /*
  57         * boostable = -1: This instruction type is not boostable.
  58         * boostable = 0: This instruction type is boostable.
  59         * boostable = 1: This instruction has been boosted: we have
  60         * added a relative jump after the instruction copy in insn,
  61         * so no single-step and fixup are needed (unless there's
  62         * a post_handler or break_handler).
  63         */
  64        int boostable;
  65};
  66
  67struct prev_kprobe {
  68        struct kprobe *kp;
  69        unsigned long status;
  70        unsigned long old_flags;
  71        unsigned long saved_flags;
  72};
  73
  74/* per-cpu kprobe control block */
  75struct kprobe_ctlblk {
  76        unsigned long kprobe_status;
  77        unsigned long kprobe_old_flags;
  78        unsigned long kprobe_saved_flags;
  79        unsigned long *jprobe_saved_sp;
  80        struct pt_regs jprobe_saved_regs;
  81        kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
  82        struct prev_kprobe prev_kprobe;
  83};
  84
  85extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  86extern int kprobe_exceptions_notify(struct notifier_block *self,
  87                                    unsigned long val, void *data);
  88#endif /* _ASM_X86_KPROBES_H */
  89