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1/*
2 * arch/arm/include/asm/ptrace.h
3 *
4 * Copyright (C) 1996-2003 Russell King
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#ifndef __ASM_ARM_PTRACE_H
11#define __ASM_ARM_PTRACE_H
12
13#include <uapi/asm/ptrace.h>
14
15#ifndef __ASSEMBLY__
16struct pt_regs {
17 unsigned long uregs[18];
18};
19
20#define user_mode(regs) \
21 (((regs)->ARM_cpsr & 0xf) == 0)
22
23#ifdef CONFIG_ARM_THUMB
24#define thumb_mode(regs) \
25 (((regs)->ARM_cpsr & PSR_T_BIT))
26#else
27#define thumb_mode(regs) (0)
28#endif
29
30#ifndef CONFIG_CPU_V7M
31#define isa_mode(regs) \
32 ((((regs)->ARM_cpsr & PSR_J_BIT) >> (__ffs(PSR_J_BIT) - 1)) | \
33 (((regs)->ARM_cpsr & PSR_T_BIT) >> (__ffs(PSR_T_BIT))))
34#else
35#define isa_mode(regs) 1 /* Thumb */
36#endif
37
38#define processor_mode(regs) \
39 ((regs)->ARM_cpsr & MODE_MASK)
40
41#define interrupts_enabled(regs) \
42 (!((regs)->ARM_cpsr & PSR_I_BIT))
43
44#define fast_interrupts_enabled(regs) \
45 (!((regs)->ARM_cpsr & PSR_F_BIT))
46
47/* Are the current registers suitable for user mode?
48 * (used to maintain security in signal handlers)
49 */
50static inline int valid_user_regs(struct pt_regs *regs)
51{
52#ifndef CONFIG_CPU_V7M
53 unsigned long mode = regs->ARM_cpsr & MODE_MASK;
54
55 /*
56 * Always clear the F (FIQ) and A (delayed abort) bits
57 */
58 regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
59
60 if ((regs->ARM_cpsr & PSR_I_BIT) == 0) {
61 if (mode == USR_MODE)
62 return 1;
63 if (elf_hwcap & HWCAP_26BIT && mode == USR26_MODE)
64 return 1;
65 }
66
67 /*
68 * Force CPSR to something logical...
69 */
70 regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | PSR_T_BIT | MODE32_BIT;
71 if (!(elf_hwcap & HWCAP_26BIT))
72 regs->ARM_cpsr |= USR_MODE;
73
74 return 0;
75#else /* ifndef CONFIG_CPU_V7M */
76 return 1;
77#endif
78}
79
80static inline long regs_return_value(struct pt_regs *regs)
81{
82 return regs->ARM_r0;
83}
84
85#define instruction_pointer(regs) (regs)->ARM_pc
86
87static inline void instruction_pointer_set(struct pt_regs *regs,
88 unsigned long val)
89{
90 instruction_pointer(regs) = val;
91}
92
93#ifdef CONFIG_SMP
94extern unsigned long profile_pc(struct pt_regs *regs);
95#else
96#define profile_pc(regs) instruction_pointer(regs)
97#endif
98
99#define predicate(x) ((x) & 0xf0000000)
100#define PREDICATE_ALWAYS 0xe0000000
101
102/*
103 * True if instr is a 32-bit thumb instruction. This works if instr
104 * is the first or only half-word of a thumb instruction. It also works
105 * when instr holds all 32-bits of a wide thumb instruction if stored
106 * in the form (first_half<<16)|(second_half)
107 */
108#define is_wide_instruction(instr) ((unsigned)(instr) >= 0xe800)
109
110/*
111 * kprobe-based event tracer support
112 */
113#include <linux/stddef.h>
114#include <linux/types.h>
115#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0))
116
117extern int regs_query_register_offset(const char *name);
118extern const char *regs_query_register_name(unsigned int offset);
119extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
120extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
121 unsigned int n);
122
123/**
124 * regs_get_register() - get register value from its offset
125 * @regs: pt_regs from which register value is gotten
126 * @offset: offset number of the register.
127 *
128 * regs_get_register returns the value of a register whose offset from @regs.
129 * The @offset is the offset of the register in struct pt_regs.
130 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
131 */
132static inline unsigned long regs_get_register(struct pt_regs *regs,
133 unsigned int offset)
134{
135 if (unlikely(offset > MAX_REG_OFFSET))
136 return 0;
137 return *(unsigned long *)((unsigned long)regs + offset);
138}
139
140/* Valid only for Kernel mode traps. */
141static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
142{
143 return regs->ARM_sp;
144}
145
146static inline unsigned long user_stack_pointer(struct pt_regs *regs)
147{
148 return regs->ARM_sp;
149}
150
151#define current_pt_regs(void) ({ \
152 register unsigned long sp asm ("sp"); \
153 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) - 7) - 1; \
154})
155
156#endif /* __ASSEMBLY__ */
157#endif
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/include/asm/ptrace.h
4 *
5 * Copyright (C) 1996-2003 Russell King
6 */
7#ifndef __ASM_ARM_PTRACE_H
8#define __ASM_ARM_PTRACE_H
9
10#include <uapi/asm/ptrace.h>
11
12#ifndef __ASSEMBLY__
13#include <linux/types.h>
14
15struct pt_regs {
16 unsigned long uregs[18];
17};
18
19struct svc_pt_regs {
20 struct pt_regs regs;
21 u32 dacr;
22 u32 addr_limit;
23};
24
25#define to_svc_pt_regs(r) container_of(r, struct svc_pt_regs, regs)
26
27#define user_mode(regs) \
28 (((regs)->ARM_cpsr & 0xf) == 0)
29
30#ifdef CONFIG_ARM_THUMB
31#define thumb_mode(regs) \
32 (((regs)->ARM_cpsr & PSR_T_BIT))
33#else
34#define thumb_mode(regs) (0)
35#endif
36
37#ifndef CONFIG_CPU_V7M
38#define isa_mode(regs) \
39 ((((regs)->ARM_cpsr & PSR_J_BIT) >> (__ffs(PSR_J_BIT) - 1)) | \
40 (((regs)->ARM_cpsr & PSR_T_BIT) >> (__ffs(PSR_T_BIT))))
41#else
42#define isa_mode(regs) 1 /* Thumb */
43#endif
44
45#define processor_mode(regs) \
46 ((regs)->ARM_cpsr & MODE_MASK)
47
48#define interrupts_enabled(regs) \
49 (!((regs)->ARM_cpsr & PSR_I_BIT))
50
51#define fast_interrupts_enabled(regs) \
52 (!((regs)->ARM_cpsr & PSR_F_BIT))
53
54/* Are the current registers suitable for user mode?
55 * (used to maintain security in signal handlers)
56 */
57static inline int valid_user_regs(struct pt_regs *regs)
58{
59#ifndef CONFIG_CPU_V7M
60 unsigned long mode = regs->ARM_cpsr & MODE_MASK;
61
62 /*
63 * Always clear the F (FIQ) and A (delayed abort) bits
64 */
65 regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
66
67 if ((regs->ARM_cpsr & PSR_I_BIT) == 0) {
68 if (mode == USR_MODE)
69 return 1;
70 if (elf_hwcap & HWCAP_26BIT && mode == USR26_MODE)
71 return 1;
72 }
73
74 /*
75 * Force CPSR to something logical...
76 */
77 regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | PSR_T_BIT | MODE32_BIT;
78 if (!(elf_hwcap & HWCAP_26BIT))
79 regs->ARM_cpsr |= USR_MODE;
80
81 return 0;
82#else /* ifndef CONFIG_CPU_V7M */
83 return 1;
84#endif
85}
86
87static inline long regs_return_value(struct pt_regs *regs)
88{
89 return regs->ARM_r0;
90}
91
92#define instruction_pointer(regs) (regs)->ARM_pc
93
94#ifdef CONFIG_THUMB2_KERNEL
95#define frame_pointer(regs) (regs)->ARM_r7
96#else
97#define frame_pointer(regs) (regs)->ARM_fp
98#endif
99
100static inline void instruction_pointer_set(struct pt_regs *regs,
101 unsigned long val)
102{
103 instruction_pointer(regs) = val;
104}
105
106#ifdef CONFIG_SMP
107extern unsigned long profile_pc(struct pt_regs *regs);
108#else
109#define profile_pc(regs) instruction_pointer(regs)
110#endif
111
112#define predicate(x) ((x) & 0xf0000000)
113#define PREDICATE_ALWAYS 0xe0000000
114
115/*
116 * True if instr is a 32-bit thumb instruction. This works if instr
117 * is the first or only half-word of a thumb instruction. It also works
118 * when instr holds all 32-bits of a wide thumb instruction if stored
119 * in the form (first_half<<16)|(second_half)
120 */
121#define is_wide_instruction(instr) ((unsigned)(instr) >= 0xe800)
122
123/*
124 * kprobe-based event tracer support
125 */
126#include <linux/compiler.h>
127#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0))
128
129extern int regs_query_register_offset(const char *name);
130extern const char *regs_query_register_name(unsigned int offset);
131extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
132extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
133 unsigned int n);
134
135/**
136 * regs_get_register() - get register value from its offset
137 * @regs: pt_regs from which register value is gotten
138 * @offset: offset number of the register.
139 *
140 * regs_get_register returns the value of a register whose offset from @regs.
141 * The @offset is the offset of the register in struct pt_regs.
142 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
143 */
144static inline unsigned long regs_get_register(struct pt_regs *regs,
145 unsigned int offset)
146{
147 if (unlikely(offset > MAX_REG_OFFSET))
148 return 0;
149 return *(unsigned long *)((unsigned long)regs + offset);
150}
151
152/* Valid only for Kernel mode traps. */
153static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
154{
155 return regs->ARM_sp;
156}
157
158static inline unsigned long user_stack_pointer(struct pt_regs *regs)
159{
160 return regs->ARM_sp;
161}
162
163#define current_pt_regs(void) ({ (struct pt_regs *) \
164 ((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1; \
165})
166
167#endif /* __ASSEMBLY__ */
168#endif