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9#ifndef _ASM_PTRACE_H
10#define _ASM_PTRACE_H
11
12
13#include <linux/compiler.h>
14#include <linux/linkage.h>
15#include <linux/types.h>
16#include <asm/isadep.h>
17#include <asm/page.h>
18#include <asm/thread_info.h>
19#include <uapi/asm/ptrace.h>
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28struct pt_regs {
29#ifdef CONFIG_32BIT
30
31 unsigned long pad0[8];
32#endif
33
34
35 unsigned long regs[32];
36
37
38 unsigned long cp0_status;
39 unsigned long hi;
40 unsigned long lo;
41#ifdef CONFIG_CPU_HAS_SMARTMIPS
42 unsigned long acx;
43#endif
44 unsigned long cp0_badvaddr;
45 unsigned long cp0_cause;
46 unsigned long cp0_epc;
47#ifdef CONFIG_CPU_CAVIUM_OCTEON
48 unsigned long long mpl[6];
49 unsigned long long mtp[6];
50#endif
51 unsigned long __last[0];
52} __aligned(8);
53
54static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
55{
56 return regs->regs[31];
57}
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64static inline void instruction_pointer_set(struct pt_regs *regs,
65 unsigned long val)
66{
67 regs->cp0_epc = val;
68}
69
70
71extern int regs_query_register_offset(const char *name);
72#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
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83static inline unsigned long regs_get_register(struct pt_regs *regs,
84 unsigned int offset)
85{
86 if (unlikely(offset > MAX_REG_OFFSET))
87 return 0;
88
89 return *(unsigned long *)((unsigned long)regs + offset);
90}
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99
100static inline int regs_within_kernel_stack(struct pt_regs *regs,
101 unsigned long addr)
102{
103 return ((addr & ~(THREAD_SIZE - 1)) ==
104 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
105}
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115
116static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
117 unsigned int n)
118{
119 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
120
121 addr += n;
122 if (regs_within_kernel_stack(regs, (unsigned long)addr))
123 return *addr;
124 else
125 return 0;
126}
127
128struct task_struct;
129
130extern int ptrace_getregs(struct task_struct *child,
131 struct user_pt_regs __user *data);
132extern int ptrace_setregs(struct task_struct *child,
133 struct user_pt_regs __user *data);
134
135extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
136extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
137
138extern int ptrace_get_watch_regs(struct task_struct *child,
139 struct pt_watch_regs __user *addr);
140extern int ptrace_set_watch_regs(struct task_struct *child,
141 struct pt_watch_regs __user *addr);
142
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145
146#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
147
148static inline int is_syscall_success(struct pt_regs *regs)
149{
150 return !regs->regs[7];
151}
152
153static inline long regs_return_value(struct pt_regs *regs)
154{
155 if (is_syscall_success(regs))
156 return regs->regs[2];
157 else
158 return -regs->regs[2];
159}
160
161#define instruction_pointer(regs) ((regs)->cp0_epc)
162#define profile_pc(regs) instruction_pointer(regs)
163
164extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
165extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
166
167extern void die(const char *, struct pt_regs *) __noreturn;
168
169static inline void die_if_kernel(const char *str, struct pt_regs *regs)
170{
171 if (unlikely(!user_mode(regs)))
172 die(str, regs);
173}
174
175#define current_pt_regs() \
176({ \
177 unsigned long sp = (unsigned long)__builtin_frame_address(0); \
178 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
179})
180
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183static inline unsigned long user_stack_pointer(struct pt_regs *regs)
184{
185 return regs->regs[29];
186}
187
188static inline void user_stack_pointer_set(struct pt_regs *regs,
189 unsigned long val)
190{
191 regs->regs[29] = val;
192}
193
194#endif
195