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 */ 87