| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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 | }; |
| 48 | |
| 49 | void arch_remove_kprobe(struct kprobe *); |
| 50 | int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr); |
| 51 | int kprobe_exceptions_notify(struct notifier_block *self, |
| 52 | unsigned long val, void *data); |
| 53 | |
| 54 | /* optinsn template addresses */ |
| 55 | extern __visible kprobe_opcode_t optprobe_template_entry; |
| 56 | extern __visible kprobe_opcode_t optprobe_template_val; |
| 57 | extern __visible kprobe_opcode_t optprobe_template_call; |
| 58 | extern __visible kprobe_opcode_t optprobe_template_end; |
| 59 | extern __visible kprobe_opcode_t optprobe_template_sub_sp; |
| 60 | extern __visible kprobe_opcode_t optprobe_template_add_sp; |
| 61 | extern __visible kprobe_opcode_t optprobe_template_restore_begin; |
| 62 | extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn; |
| 63 | extern __visible kprobe_opcode_t optprobe_template_restore_end; |
| 64 | |
| 65 | #define MAX_OPTIMIZED_LENGTH 4 |
| 66 | #define MAX_OPTINSN_SIZE \ |
| 67 | ((unsigned long)&optprobe_template_end - \ |
| 68 | (unsigned long)&optprobe_template_entry) |
| 69 | #define RELATIVEJUMP_SIZE 4 |
| 70 | |
| 71 | struct arch_optimized_insn { |
| 72 | /* |
| 73 | * copy of the original instructions. |
| 74 | * Different from x86, ARM kprobe_opcode_t is u32. |
| 75 | */ |
| 76 | #define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t)) |
| 77 | kprobe_opcode_t copied_insn[MAX_COPIED_INSN]; |
| 78 | /* detour code buffer */ |
| 79 | kprobe_opcode_t *insn; |
| 80 | /* |
| 81 | * We always copy one instruction on ARM, |
| 82 | * so size will always be 4, and unlike x86, there is no |
| 83 | * need for a size field. |
| 84 | */ |
| 85 | }; |
| 86 | |
| 87 | #endif /* CONFIG_KPROBES */ |
| 88 | #endif /* _ARM_KPROBES_H */ |