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 */ 91