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