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