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 int kprobe_exceptions_notify(struct notifier_block *self,
44 			     unsigned long val, void *data);
45 
46 /* optinsn template addresses */
47 extern __visible kprobe_opcode_t optprobe_template_entry[];
48 extern __visible kprobe_opcode_t optprobe_template_val[];
49 extern __visible kprobe_opcode_t optprobe_template_call[];
50 extern __visible kprobe_opcode_t optprobe_template_end[];
51 extern __visible kprobe_opcode_t optprobe_template_sub_sp[];
52 extern __visible kprobe_opcode_t optprobe_template_add_sp[];
53 extern __visible kprobe_opcode_t optprobe_template_restore_begin[];
54 extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn[];
55 extern __visible kprobe_opcode_t optprobe_template_restore_end[];
56 
57 #define MAX_OPTIMIZED_LENGTH	4
58 #define MAX_OPTINSN_SIZE				\
59 	((unsigned long)optprobe_template_end -	\
60 	 (unsigned long)optprobe_template_entry)
61 #define RELATIVEJUMP_SIZE	4
62 
63 struct arch_optimized_insn {
64 	/*
65 	 * copy of the original instructions.
66 	 * Different from x86, ARM kprobe_opcode_t is u32.
67 	 */
68 #define MAX_COPIED_INSN	DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
69 	kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
70 	/* detour code buffer */
71 	kprobe_opcode_t *insn;
72 	/*
73 	 * We always copy one instruction on ARM,
74 	 * so size will always be 4, and unlike x86, there is no
75 	 * need for a size field.
76 	 */
77 };
78 
79 #endif /* CONFIG_KPROBES */
80 #endif /* _ARM_KPROBES_H */
81