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
  32 typedef u32 kprobe_opcode_t;
  33 struct kprobe;
  34 #include <asm/probes.h>
  35
  36 #define arch_specific_insn      arch_probes_insn
  37
  38 struct prev_kprobe {
  39         struct kprobe *kp;
  40         unsigned int status;
  41 };
  42
  43 /* per-cpu kprobe control block */
  44 struct 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
  51 void arch_remove_kprobe(struct kprobe *);
  52 int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
  53 int kprobe_exceptions_notify(struct notifier_block *self,
  54                              unsigned long val, void *data);
  55
  56 /* optinsn template addresses */
  57 extern __visible kprobe_opcode_t optprobe_template_entry;
  58 extern __visible kprobe_opcode_t optprobe_template_val;
  59 extern __visible kprobe_opcode_t optprobe_template_call;
  60 extern __visible kprobe_opcode_t optprobe_template_end;
  61 extern __visible kprobe_opcode_t optprobe_template_sub_sp;
  62 extern __visible kprobe_opcode_t optprobe_template_add_sp;
  63 extern __visible kprobe_opcode_t optprobe_template_restore_begin;
  64 extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn;
  65 extern __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
  73 struct 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 */