1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * arch/arm/include/asm/kprobes.h
4 *
5 * Copyright (C) 2006, 2007 Motorola Inc.
6 */
7
8 #ifndef _ARM_KPROBES_H
9 #define _ARM_KPROBES_H
10
11 #include <asm-generic/kprobes.h>
12
13 #ifdef CONFIG_KPROBES
14 #include <linux/types.h>
15 #include <linux/ptrace.h>
16 #include <linux/notifier.h>
17
18 #define __ARCH_WANT_KPROBES_INSN_SLOT
19 #define MAX_INSN_SIZE 2
20
21 #define flush_insn_slot(p) do { } while (0)
22 #define kretprobe_blacklist_size 0
23
24 typedef u32 kprobe_opcode_t;
25 struct kprobe;
26 #include <asm/probes.h>
27
28 #define arch_specific_insn arch_probes_insn
29
30 struct prev_kprobe {
31 struct kprobe *kp;
32 unsigned int status;
33 };
34
35 /* per-cpu kprobe control block */
36 struct kprobe_ctlblk {
37 unsigned int kprobe_status;
38 struct prev_kprobe prev_kprobe;
39 };
40
41 void arch_remove_kprobe(struct kprobe *);
42 int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
43
44 /* optinsn template addresses */
45 extern __visible kprobe_opcode_t optprobe_template_entry[];
46 extern __visible kprobe_opcode_t optprobe_template_val[];
47 extern __visible kprobe_opcode_t optprobe_template_call[];
48 extern __visible kprobe_opcode_t optprobe_template_end[];
49 extern __visible kprobe_opcode_t optprobe_template_sub_sp[];
50 extern __visible kprobe_opcode_t optprobe_template_add_sp[];
51 extern __visible kprobe_opcode_t optprobe_template_restore_begin[];
52 extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn[];
53 extern __visible kprobe_opcode_t optprobe_template_restore_end[];
54
55 #define MAX_OPTIMIZED_LENGTH 4
56 #define MAX_OPTINSN_SIZE \
57 ((unsigned long)optprobe_template_end - \
58 (unsigned long)optprobe_template_entry)
59 #define RELATIVEJUMP_SIZE 4
60
61 struct arch_optimized_insn {
62 /*
63 * copy of the original instructions.
64 * Different from x86, ARM kprobe_opcode_t is u32.
65 */
66 #define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
67 kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
68 /* detour code buffer */
69 kprobe_opcode_t *insn;
70 /*
71 * We always copy one instruction on ARM,
72 * so size will always be 4, and unlike x86, there is no
73 * need for a size field.
74 */
75 };
76
77 #endif /* CONFIG_KPROBES */
78 #endif /* _ARM_KPROBES_H */
79
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