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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
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>
20
21/*
22 * This struct defines the way the registers are stored on the stack during a
23 * system call/exception. As usual the registers k0/k1 aren't being saved.
24 *
25 * If you add a register here, also add it to regoffset_table[] in
26 * arch/mips/kernel/ptrace.c.
27 */
28struct pt_regs {
29#ifdef CONFIG_32BIT
30 /* Pad bytes for argument save space on the stack. */
31 unsigned long pad0[8];
32#endif
33
34 /* Saved main processor registers. */
35 unsigned long regs[32];
36
37 /* Saved special registers. */
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]; /* MTM{0-5} */
49 unsigned long long mtp[6]; /* MTP{0-5} */
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}
58
59static inline void instruction_pointer_set(struct pt_regs *regs,
60 unsigned long val)
61{
62 regs->cp0_epc = val;
63}
64
65/* Query offset/name of register from its name/offset */
66extern int regs_query_register_offset(const char *name);
67#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
68
69/**
70 * regs_get_register() - get register value from its offset
71 * @regs: pt_regs from which register value is gotten.
72 * @offset: offset number of the register.
73 *
74 * regs_get_register returns the value of a register. The @offset is the
75 * offset of the register in struct pt_regs address which specified by @regs.
76 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
77 */
78static inline unsigned long regs_get_register(struct pt_regs *regs,
79 unsigned int offset)
80{
81 if (unlikely(offset > MAX_REG_OFFSET))
82 return 0;
83
84 return *(unsigned long *)((unsigned long)regs + offset);
85}
86
87/**
88 * regs_within_kernel_stack() - check the address in the stack
89 * @regs: pt_regs which contains kernel stack pointer.
90 * @addr: address which is checked.
91 *
92 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
93 * If @addr is within the kernel stack, it returns true. If not, returns false.
94 */
95static inline int regs_within_kernel_stack(struct pt_regs *regs,
96 unsigned long addr)
97{
98 return ((addr & ~(THREAD_SIZE - 1)) ==
99 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
100}
101
102/**
103 * regs_get_kernel_stack_nth() - get Nth entry of the stack
104 * @regs: pt_regs which contains kernel stack pointer.
105 * @n: stack entry number.
106 *
107 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
108 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
109 * this returns 0.
110 */
111static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
112 unsigned int n)
113{
114 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
115
116 addr += n;
117 if (regs_within_kernel_stack(regs, (unsigned long)addr))
118 return *addr;
119 else
120 return 0;
121}
122
123struct task_struct;
124
125extern int ptrace_getregs(struct task_struct *child,
126 struct user_pt_regs __user *data);
127extern int ptrace_setregs(struct task_struct *child,
128 struct user_pt_regs __user *data);
129
130extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
131extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
132
133extern int ptrace_get_watch_regs(struct task_struct *child,
134 struct pt_watch_regs __user *addr);
135extern int ptrace_set_watch_regs(struct task_struct *child,
136 struct pt_watch_regs __user *addr);
137
138/*
139 * Does the process account for user or for system time?
140 */
141#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
142
143static inline int is_syscall_success(struct pt_regs *regs)
144{
145 return !regs->regs[7];
146}
147
148static inline long regs_return_value(struct pt_regs *regs)
149{
150 if (is_syscall_success(regs) || !user_mode(regs))
151 return regs->regs[2];
152 else
153 return -regs->regs[2];
154}
155
156#define instruction_pointer(regs) ((regs)->cp0_epc)
157#define profile_pc(regs) instruction_pointer(regs)
158
159extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
160extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
161
162extern void die(const char *, struct pt_regs *) __noreturn;
163
164static inline void die_if_kernel(const char *str, struct pt_regs *regs)
165{
166 if (unlikely(!user_mode(regs)))
167 die(str, regs);
168}
169
170#define current_pt_regs() \
171({ \
172 unsigned long sp = (unsigned long)__builtin_frame_address(0); \
173 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
174})
175
176/* Helpers for working with the user stack pointer */
177
178static inline unsigned long user_stack_pointer(struct pt_regs *regs)
179{
180 return regs->regs[29];
181}
182
183static inline void user_stack_pointer_set(struct pt_regs *regs,
184 unsigned long val)
185{
186 regs->regs[29] = val;
187}
188
189#endif /* _ASM_PTRACE_H */
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
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>
20
21/*
22 * This struct defines the way the registers are stored on the stack during a
23 * system call/exception. As usual the registers k0/k1 aren't being saved.
24 *
25 * If you add a register here, also add it to regoffset_table[] in
26 * arch/mips/kernel/ptrace.c.
27 */
28struct pt_regs {
29#ifdef CONFIG_32BIT
30 /* Pad bytes for argument save space on the stack. */
31 unsigned long pad0[8];
32#endif
33
34 /* Saved main processor registers. */
35 unsigned long regs[32];
36
37 /* Saved special registers. */
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]; /* MTM{0-5} */
49 unsigned long long mtp[6]; /* MTP{0-5} */
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[29];
57}
58
59static inline void instruction_pointer_set(struct pt_regs *regs,
60 unsigned long val)
61{
62 regs->cp0_epc = val;
63}
64
65/* Query offset/name of register from its name/offset */
66extern int regs_query_register_offset(const char *name);
67#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
68
69/**
70 * regs_get_register() - get register value from its offset
71 * @regs: pt_regs from which register value is gotten.
72 * @offset: offset number of the register.
73 *
74 * regs_get_register returns the value of a register. The @offset is the
75 * offset of the register in struct pt_regs address which specified by @regs.
76 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
77 */
78static inline unsigned long regs_get_register(struct pt_regs *regs,
79 unsigned int offset)
80{
81 if (unlikely(offset > MAX_REG_OFFSET))
82 return 0;
83
84 return *(unsigned long *)((unsigned long)regs + offset);
85}
86
87/**
88 * regs_within_kernel_stack() - check the address in the stack
89 * @regs: pt_regs which contains kernel stack pointer.
90 * @addr: address which is checked.
91 *
92 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
93 * If @addr is within the kernel stack, it returns true. If not, returns false.
94 */
95static inline int regs_within_kernel_stack(struct pt_regs *regs,
96 unsigned long addr)
97{
98 return ((addr & ~(THREAD_SIZE - 1)) ==
99 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
100}
101
102/**
103 * regs_get_kernel_stack_nth() - get Nth entry of the stack
104 * @regs: pt_regs which contains kernel stack pointer.
105 * @n: stack entry number.
106 *
107 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
108 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
109 * this returns 0.
110 */
111static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
112 unsigned int n)
113{
114 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
115
116 addr += n;
117 if (regs_within_kernel_stack(regs, (unsigned long)addr))
118 return *addr;
119 else
120 return 0;
121}
122
123struct task_struct;
124
125extern int ptrace_getregs(struct task_struct *child,
126 struct user_pt_regs __user *data);
127extern int ptrace_setregs(struct task_struct *child,
128 struct user_pt_regs __user *data);
129
130extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
131extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
132
133extern int ptrace_get_watch_regs(struct task_struct *child,
134 struct pt_watch_regs __user *addr);
135extern int ptrace_set_watch_regs(struct task_struct *child,
136 struct pt_watch_regs __user *addr);
137
138/*
139 * Does the process account for user or for system time?
140 */
141#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
142
143static inline int is_syscall_success(struct pt_regs *regs)
144{
145 return !regs->regs[7];
146}
147
148static inline long regs_return_value(struct pt_regs *regs)
149{
150 if (is_syscall_success(regs) || !user_mode(regs))
151 return regs->regs[2];
152 else
153 return -regs->regs[2];
154}
155
156#define instruction_pointer(regs) ((regs)->cp0_epc)
157#define profile_pc(regs) instruction_pointer(regs)
158
159extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
160extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
161
162extern void die(const char *, struct pt_regs *) __noreturn;
163
164static inline void die_if_kernel(const char *str, struct pt_regs *regs)
165{
166 if (unlikely(!user_mode(regs)))
167 die(str, regs);
168}
169
170#define current_pt_regs() \
171({ \
172 unsigned long sp = (unsigned long)__builtin_frame_address(0); \
173 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
174})
175
176/* Helpers for working with the user stack pointer */
177
178static inline unsigned long user_stack_pointer(struct pt_regs *regs)
179{
180 return regs->regs[29];
181}
182
183static inline void user_stack_pointer_set(struct pt_regs *regs,
184 unsigned long val)
185{
186 regs->regs[29] = val;
187}
188
189#endif /* _ASM_PTRACE_H */