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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 <uapi/asm/ptrace.h>
18
19/*
20 * This struct defines the way the registers are stored on the stack during a
21 * system call/exception. As usual the registers k0/k1 aren't being saved.
22 */
23struct pt_regs {
24#ifdef CONFIG_32BIT
25 /* Pad bytes for argument save space on the stack. */
26 unsigned long pad0[6];
27#endif
28
29 /* Saved main processor registers. */
30 unsigned long regs[32];
31
32 /* Saved special registers. */
33 unsigned long cp0_status;
34 unsigned long hi;
35 unsigned long lo;
36#ifdef CONFIG_CPU_HAS_SMARTMIPS
37 unsigned long acx;
38#endif
39 unsigned long cp0_badvaddr;
40 unsigned long cp0_cause;
41 unsigned long cp0_epc;
42#ifdef CONFIG_MIPS_MT_SMTC
43 unsigned long cp0_tcstatus;
44#endif /* CONFIG_MIPS_MT_SMTC */
45#ifdef CONFIG_CPU_CAVIUM_OCTEON
46 unsigned long long mpl[3]; /* MTM{0,1,2} */
47 unsigned long long mtp[3]; /* MTP{0,1,2} */
48#endif
49} __aligned(8);
50
51struct task_struct;
52
53extern int ptrace_getregs(struct task_struct *child, __s64 __user *data);
54extern int ptrace_setregs(struct task_struct *child, __s64 __user *data);
55
56extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
57extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
58
59extern int ptrace_get_watch_regs(struct task_struct *child,
60 struct pt_watch_regs __user *addr);
61extern int ptrace_set_watch_regs(struct task_struct *child,
62 struct pt_watch_regs __user *addr);
63
64/*
65 * Does the process account for user or for system time?
66 */
67#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
68
69static inline int is_syscall_success(struct pt_regs *regs)
70{
71 return !regs->regs[7];
72}
73
74static inline long regs_return_value(struct pt_regs *regs)
75{
76 if (is_syscall_success(regs))
77 return regs->regs[2];
78 else
79 return -regs->regs[2];
80}
81
82#define instruction_pointer(regs) ((regs)->cp0_epc)
83#define profile_pc(regs) instruction_pointer(regs)
84
85extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
86extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
87
88extern void die(const char *, struct pt_regs *) __noreturn;
89
90static inline void die_if_kernel(const char *str, struct pt_regs *regs)
91{
92 if (unlikely(!user_mode(regs)))
93 die(str, regs);
94}
95
96#define current_pt_regs() \
97({ \
98 unsigned long sp = (unsigned long)__builtin_frame_address(0); \
99 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
100})
101
102/* Helpers for working with the user stack pointer */
103
104static inline unsigned long user_stack_pointer(struct pt_regs *regs)
105{
106 return regs->regs[29];
107}
108
109static inline void user_stack_pointer_set(struct pt_regs *regs,
110 unsigned long val)
111{
112 regs->regs[29] = val;
113}
114
115#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[31];
57}
58
59/*
60 * Don't use asm-generic/ptrace.h it defines FP accessors that don't make
61 * sense on MIPS. We rather want an error if they get invoked.
62 */
63
64static inline void instruction_pointer_set(struct pt_regs *regs,
65 unsigned long val)
66{
67 regs->cp0_epc = val;
68}
69
70/* Query offset/name of register from its name/offset */
71extern int regs_query_register_offset(const char *name);
72#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
73
74/**
75 * regs_get_register() - get register value from its offset
76 * @regs: pt_regs from which register value is gotten.
77 * @offset: offset number of the register.
78 *
79 * regs_get_register returns the value of a register. The @offset is the
80 * offset of the register in struct pt_regs address which specified by @regs.
81 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
82 */
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}
91
92/**
93 * regs_within_kernel_stack() - check the address in the stack
94 * @regs: pt_regs which contains kernel stack pointer.
95 * @addr: address which is checked.
96 *
97 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
98 * If @addr is within the kernel stack, it returns true. If not, returns false.
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}
106
107/**
108 * regs_get_kernel_stack_nth() - get Nth entry of the stack
109 * @regs: pt_regs which contains kernel stack pointer.
110 * @n: stack entry number.
111 *
112 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
113 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
114 * this returns 0.
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
143/*
144 * Does the process account for user or for system time?
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
181/* Helpers for working with the user stack pointer */
182
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 /* _ASM_PTRACE_H */