1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * arch/arm/include/asm/probes.h
4  *
5  * Original contents copied from arch/arm/include/asm/kprobes.h
6  * which contains the following notice...
7  *
8  * Copyright (C) 2006, 2007 Motorola Inc.
9  */
10 
11 #ifndef _ASM_PROBES_H
12 #define _ASM_PROBES_H
13 
14 #ifndef __ASSEMBLY__
15 
16 typedef u32 probes_opcode_t;
17 
18 struct arch_probes_insn;
19 typedef void (probes_insn_handler_t)(probes_opcode_t,
20 				     struct arch_probes_insn *,
21 				     struct pt_regs *);
22 typedef unsigned long (probes_check_cc)(unsigned long);
23 typedef void (probes_insn_singlestep_t)(probes_opcode_t,
24 					struct arch_probes_insn *,
25 					struct pt_regs *);
26 typedef void (probes_insn_fn_t)(void);
27 
28 /* Architecture specific copy of original instruction. */
29 struct arch_probes_insn {
30 	probes_opcode_t			*insn;
31 	probes_insn_handler_t		*insn_handler;
32 	probes_check_cc			*insn_check_cc;
33 	probes_insn_singlestep_t	*insn_singlestep;
34 	probes_insn_fn_t		*insn_fn;
35 	int				stack_space;
36 	unsigned long			register_usage_flags;
37 	bool				kprobe_direct_exec;
38 };
39 
40 #endif /* __ASSEMBLY__ */
41 
42 /*
43  * We assume one instruction can consume at most 64 bytes stack, which is
44  * 'push {r0-r15}'. Instructions consume more or unknown stack space like
45  * 'str r0, [sp, #-80]' and 'str r0, [sp, r1]' should be prohibit to probe.
46  */
47 #define MAX_STACK_SIZE			64
48 
49 #endif
50