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 <linux/types.h>
  20#include <linux/ptrace.h>
  21#include <linux/notifier.h>
  22
  23#define __ARCH_WANT_KPROBES_INSN_SLOT
  24#define MAX_INSN_SIZE                   2
  25
  26#define flush_insn_slot(p)              do { } while (0)
  27#define kretprobe_blacklist_size        0
  28
  29typedef u32 kprobe_opcode_t;
  30struct kprobe;
  31#include <asm/probes.h>
  32
  33#define arch_specific_insn      arch_probes_insn
  34
  35struct prev_kprobe {
  36        struct kprobe *kp;
  37        unsigned int status;
  38};
  39
  40/* per-cpu kprobe control block */
  41struct kprobe_ctlblk {
  42        unsigned int kprobe_status;
  43        struct prev_kprobe prev_kprobe;
  44        struct pt_regs jprobe_saved_regs;
  45        char jprobes_stack[MAX_STACK_SIZE];
  46};
  47
  48void arch_remove_kprobe(struct kprobe *);
  49int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
  50int kprobe_exceptions_notify(struct notifier_block *self,
  51                             unsigned long val, void *data);
  52
  53/* optinsn template addresses */
  54extern __visible kprobe_opcode_t optprobe_template_entry;
  55extern __visible kprobe_opcode_t optprobe_template_val;
  56extern __visible kprobe_opcode_t optprobe_template_call;
  57extern __visible kprobe_opcode_t optprobe_template_end;
  58extern __visible kprobe_opcode_t optprobe_template_sub_sp;
  59extern __visible kprobe_opcode_t optprobe_template_add_sp;
  60extern __visible kprobe_opcode_t optprobe_template_restore_begin;
  61extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn;
  62extern __visible kprobe_opcode_t optprobe_template_restore_end;
  63
  64#define MAX_OPTIMIZED_LENGTH    4
  65#define MAX_OPTINSN_SIZE                                \
  66        ((unsigned long)&optprobe_template_end -        \
  67         (unsigned long)&optprobe_template_entry)
  68#define RELATIVEJUMP_SIZE       4
  69
  70struct arch_optimized_insn {
  71        /*
  72         * copy of the original instructions.
  73         * Different from x86, ARM kprobe_opcode_t is u32.
  74         */
  75#define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
  76        kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
  77        /* detour code buffer */
  78        kprobe_opcode_t *insn;
  79        /*
  80         * We always copy one instruction on ARM,
  81         * so size will always be 4, and unlike x86, there is no
  82         * need for a size field.
  83         */
  84};
  85
  86#endif /* _ARM_KPROBES_H */
  87