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/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 void kretprobe_trampoline(void); 63 64 int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr); 65 int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr); 66 int kprobe_exceptions_notify(struct notifier_block *self, 67 unsigned long val, void *data); 68 69 enum kprobe_insn { 70 INSN_REJECTED, 71 INSN_GOOD, 72 INSN_GOOD_NO_SLOT 73 }; 74 75 enum kprobe_insn arm_kprobe_decode_insn(kprobe_opcode_t, 76 struct arch_specific_insn *); 77 void __init arm_kprobe_decode_init(void); 78 79 #endif /* _ARM_KPROBES_H */ 80