include/asm-arm/kprobes.h

   1 /*
   2  * include/asm-arm/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/percpu.h>
  22
  23 #define __ARCH_WANT_KPROBES_INSN_SLOT
  24 #define MAX_INSN_SIZE                   2
  25 #define MAX_STACK_SIZE                  64      /* 32 would probably be OK */
  26
  27 /*
  28  * This undefined instruction must be unique and
  29  * reserved solely for kprobes' use.
  30  */
  31 #define KPROBE_BREAKPOINT_INSTRUCTION   0xe7f001f8
  32
  33 #define regs_return_value(regs)         ((regs)->ARM_r0)
  34 #define flush_insn_slot(p)              do { } while (0)
  35 #define kretprobe_blacklist_size        0
  36
  37 typedef u32 kprobe_opcode_t;
  38
  39 struct kprobe;
  40 typedef void (kprobe_insn_handler_t)(struct kprobe *, struct pt_regs *);
  41
  42 /* Architecture specific copy of original instruction. */
  43 struct arch_specific_insn {
  44         kprobe_opcode_t         *insn;
  45         kprobe_insn_handler_t   *insn_handler;
  46 };
  47
  48 struct prev_kprobe {
  49         struct kprobe *kp;
  50         unsigned int status;
  51 };
  52
  53 /* per-cpu kprobe control block */
  54 struct kprobe_ctlblk {
  55         unsigned int kprobe_status;
  56         struct prev_kprobe prev_kprobe;
  57         struct pt_regs jprobe_saved_regs;
  58         char jprobes_stack[MAX_STACK_SIZE];
  59 };
  60
  61 void arch_remove_kprobe(struct kprobe *);
  62
  63 int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr);
  64 int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
  65 int kprobe_exceptions_notify(struct notifier_block *self,
  66                              unsigned long val, void *data);
  67
  68 enum kprobe_insn {
  69         INSN_REJECTED,
  70         INSN_GOOD,
  71         INSN_GOOD_NO_SLOT
  72 };
  73
  74 enum kprobe_insn arm_kprobe_decode_insn(kprobe_opcode_t,
  75                                         struct arch_specific_insn *);
  76 void __init arm_kprobe_decode_init(void);
  77
  78 #endif /* _ARM_KPROBES_H */