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
  25#include <asm-generic/kprobes.h>
  26
  27#define BREAKPOINT_INSTRUCTION  0xcc
  28
  29#ifdef CONFIG_KPROBES
  30#include <linux/types.h>
  31#include <linux/ptrace.h>
  32#include <linux/percpu.h>
  33#include <asm/insn.h>
  34
  35#define  __ARCH_WANT_KPROBES_INSN_SLOT
  36
  37struct pt_regs;
  38struct kprobe;
  39
  40typedef u8 kprobe_opcode_t;
  41#define RELATIVEJUMP_OPCODE 0xe9
  42#define RELATIVEJUMP_SIZE 5
  43#define RELATIVECALL_OPCODE 0xe8
  44#define RELATIVE_ADDR_SIZE 4
  45#define MAX_STACK_SIZE 64
  46#define CUR_STACK_SIZE(ADDR) \
  47        (current_top_of_stack() - (unsigned long)(ADDR))
  48#define MIN_STACK_SIZE(ADDR)                            \
  49        (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ?        \
  50         MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR))
  51
  52#define flush_insn_slot(p)      do { } while (0)
  53
  54/* optinsn template addresses */
  55extern __visible kprobe_opcode_t optprobe_template_entry;
  56extern __visible kprobe_opcode_t optprobe_template_val;
  57extern __visible kprobe_opcode_t optprobe_template_call;
  58extern __visible kprobe_opcode_t optprobe_template_end;
  59#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE)
  60#define MAX_OPTINSN_SIZE                                \
  61        (((unsigned long)&optprobe_template_end -       \
  62          (unsigned long)&optprobe_template_entry) +    \
  63         MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE)
  64
  65extern const int kretprobe_blacklist_size;
  66
  67void arch_remove_kprobe(struct kprobe *p);
  68asmlinkage void kretprobe_trampoline(void);
  69
  70/* Architecture specific copy of original instruction*/
  71struct arch_specific_insn {
  72        /* copy of the original instruction */
  73        kprobe_opcode_t *insn;
  74        /*
  75         * boostable = -1: This instruction type is not boostable.
  76         * boostable = 0: This instruction type is boostable.
  77         * boostable = 1: This instruction has been boosted: we have
  78         * added a relative jump after the instruction copy in insn,
  79         * so no single-step and fixup are needed (unless there's
  80         * a post_handler or break_handler).
  81         */
  82        int boostable;
  83        bool if_modifier;
  84};
  85
  86struct arch_optimized_insn {
  87        /* copy of the original instructions */
  88        kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE];
  89        /* detour code buffer */
  90        kprobe_opcode_t *insn;
  91        /* the size of instructions copied to detour code buffer */
  92        size_t size;
  93};
  94
  95/* Return true (!0) if optinsn is prepared for optimization. */
  96static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
  97{
  98        return optinsn->size;
  99}
 100
 101struct prev_kprobe {
 102        struct kprobe *kp;
 103        unsigned long status;
 104        unsigned long old_flags;
 105        unsigned long saved_flags;
 106};
 107
 108/* per-cpu kprobe control block */
 109struct kprobe_ctlblk {
 110        unsigned long kprobe_status;
 111        unsigned long kprobe_old_flags;
 112        unsigned long kprobe_saved_flags;
 113        unsigned long *jprobe_saved_sp;
 114        struct pt_regs jprobe_saved_regs;
 115        kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
 116        struct prev_kprobe prev_kprobe;
 117};
 118
 119extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 120extern int kprobe_exceptions_notify(struct notifier_block *self,
 121                                    unsigned long val, void *data);
 122extern int kprobe_int3_handler(struct pt_regs *regs);
 123extern int kprobe_debug_handler(struct pt_regs *regs);
 124
 125#endif /* CONFIG_KPROBES */
 126#endif /* _ASM_X86_KPROBES_H */
 127