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

   1/*
   2 * arch/arm/include/asm/kprobes.h
   3 *
   4 * Copyright (C) 2006, 2007 Motorola Inc.
   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 version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 * General Public License for more details.
  14 */
  15
  16#ifndef _ARM_KPROBES_H
  17#define _ARM_KPROBES_H
  18
  19#include <asm-generic/kprobes.h>
  20
  21#ifdef CONFIG_KPROBES
  22#include <linux/types.h>
  23#include <linux/ptrace.h>
  24#include <linux/notifier.h>
  25
  26#define __ARCH_WANT_KPROBES_INSN_SLOT
  27#define MAX_INSN_SIZE                   2
  28
  29#define flush_insn_slot(p)              do { } while (0)
  30#define kretprobe_blacklist_size        0
  31
  32typedef u32 kprobe_opcode_t;
  33struct kprobe;
  34#include <asm/probes.h>
  35
  36#define arch_specific_insn      arch_probes_insn
  37
  38struct prev_kprobe {
  39        struct kprobe *kp;
  40        unsigned int status;
  41};
  42
  43/* per-cpu kprobe control block */
  44struct kprobe_ctlblk {
  45        unsigned int kprobe_status;
  46        struct prev_kprobe prev_kprobe;
  47        struct pt_regs jprobe_saved_regs;
  48        char jprobes_stack[MAX_STACK_SIZE];
  49};
  50
  51void arch_remove_kprobe(struct kprobe *);
  52int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
  53int kprobe_exceptions_notify(struct notifier_block *self,
  54                             unsigned long val, void *data);
  55
  56/* optinsn template addresses */
  57extern __visible kprobe_opcode_t optprobe_template_entry;
  58extern __visible kprobe_opcode_t optprobe_template_val;
  59extern __visible kprobe_opcode_t optprobe_template_call;
  60extern __visible kprobe_opcode_t optprobe_template_end;
  61extern __visible kprobe_opcode_t optprobe_template_sub_sp;
  62extern __visible kprobe_opcode_t optprobe_template_add_sp;
  63extern __visible kprobe_opcode_t optprobe_template_restore_begin;
  64extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn;
  65extern __visible kprobe_opcode_t optprobe_template_restore_end;
  66
  67#define MAX_OPTIMIZED_LENGTH    4
  68#define MAX_OPTINSN_SIZE                                \
  69        ((unsigned long)&optprobe_template_end -        \
  70         (unsigned long)&optprobe_template_entry)
  71#define RELATIVEJUMP_SIZE       4
  72
  73struct arch_optimized_insn {
  74        /*
  75         * copy of the original instructions.
  76         * Different from x86, ARM kprobe_opcode_t is u32.
  77         */
  78#define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
  79        kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
  80        /* detour code buffer */
  81        kprobe_opcode_t *insn;
  82        /*
  83         * We always copy one instruction on ARM,
  84         * so size will always be 4, and unlike x86, there is no
  85         * need for a size field.
  86         */
  87};
  88
  89#endif /* CONFIG_KPROBES */
  90#endif /* _ARM_KPROBES_H */
  91