arch/arm/kernel/kprobes.h

   1 /*
   2  * arch/arm/kernel/kprobes.h
   3  *
   4  * Contents moved from arch/arm/include/asm/kprobes.h which is
   5  * Copyright (C) 2006, 2007 Motorola Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  */
  16
  17 #ifndef _ARM_KERNEL_KPROBES_H
  18 #define _ARM_KERNEL_KPROBES_H
  19
  20 /*
  21  * This undefined instruction must be unique and
  22  * reserved solely for kprobes' use.
  23  */
  24 #define KPROBE_BREAKPOINT_INSTRUCTION   0xe7f001f8
  25
  26 enum kprobe_insn {
  27         INSN_REJECTED,
  28         INSN_GOOD,
  29         INSN_GOOD_NO_SLOT
  30 };
  31
  32 typedef enum kprobe_insn (kprobe_decode_insn_t)(kprobe_opcode_t,
  33                                                 struct arch_specific_insn *);
  34
  35 #ifdef CONFIG_THUMB2_KERNEL
  36
  37 enum kprobe_insn thumb16_kprobe_decode_insn(kprobe_opcode_t,
  38                                                 struct arch_specific_insn *);
  39 enum kprobe_insn thumb32_kprobe_decode_insn(kprobe_opcode_t,
  40                                                 struct arch_specific_insn *);
  41
  42 #else /* !CONFIG_THUMB2_KERNEL */
  43
  44 enum kprobe_insn arm_kprobe_decode_insn(kprobe_opcode_t,
  45                                         struct arch_specific_insn *);
  46 #endif
  47
  48 void __init arm_kprobe_decode_init(void);
  49
  50 extern kprobe_check_cc * const kprobe_condition_checks[16];
  51
  52
  53 #if __LINUX_ARM_ARCH__ >= 7
  54
  55 /* str_pc_offset is architecturally defined from ARMv7 onwards */
  56 #define str_pc_offset 8
  57 #define find_str_pc_offset()
  58
  59 #else /* __LINUX_ARM_ARCH__ < 7 */
  60
  61 /* We need a run-time check to determine str_pc_offset */
  62 extern int str_pc_offset;
  63 void __init find_str_pc_offset(void);
  64
  65 #endif
  66
  67
  68 /*
  69  * Test if load/store instructions writeback the address register.
  70  * if P (bit 24) == 0 or W (bit 21) == 1
  71  */
  72 #define is_writeback(insn) ((insn ^ 0x01000000) & 0x01200000)
  73
  74 #endif /* _ARM_KERNEL_KPROBES_H */