Loading...
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/* 0 - 31 are integer registers, 32 - 63 are fp registers. */
13#define FPR_BASE 32
14#define PC 64
15#define CAUSE 65
16#define BADVADDR 66
17#define MMHI 67
18#define MMLO 68
19#define FPC_CSR 69
20#define FPC_EIR 70
21#define DSP_BASE 71 /* 3 more hi / lo register pairs */
22#define DSP_CONTROL 77
23#define ACX 78
24
25/*
26 * This struct defines the way the registers are stored on the stack during a
27 * system call/exception. As usual the registers k0/k1 aren't being saved.
28 */
29struct pt_regs {
30#ifdef CONFIG_32BIT
31 /* Pad bytes for argument save space on the stack. */
32 unsigned long pad0[6];
33#endif
34
35 /* Saved main processor registers. */
36 unsigned long regs[32];
37
38 /* Saved special registers. */
39 unsigned long cp0_status;
40 unsigned long hi;
41 unsigned long lo;
42#ifdef CONFIG_CPU_HAS_SMARTMIPS
43 unsigned long acx;
44#endif
45 unsigned long cp0_badvaddr;
46 unsigned long cp0_cause;
47 unsigned long cp0_epc;
48#ifdef CONFIG_MIPS_MT_SMTC
49 unsigned long cp0_tcstatus;
50#endif /* CONFIG_MIPS_MT_SMTC */
51#ifdef CONFIG_CPU_CAVIUM_OCTEON
52 unsigned long long mpl[3]; /* MTM{0,1,2} */
53 unsigned long long mtp[3]; /* MTP{0,1,2} */
54#endif
55} __attribute__ ((aligned (8)));
56
57/* Arbitrarily choose the same ptrace numbers as used by the Sparc code. */
58#define PTRACE_GETREGS 12
59#define PTRACE_SETREGS 13
60#define PTRACE_GETFPREGS 14
61#define PTRACE_SETFPREGS 15
62/* #define PTRACE_GETFPXREGS 18 */
63/* #define PTRACE_SETFPXREGS 19 */
64
65#define PTRACE_OLDSETOPTIONS 21
66
67#define PTRACE_GET_THREAD_AREA 25
68#define PTRACE_SET_THREAD_AREA 26
69
70/* Calls to trace a 64bit program from a 32bit program. */
71#define PTRACE_PEEKTEXT_3264 0xc0
72#define PTRACE_PEEKDATA_3264 0xc1
73#define PTRACE_POKETEXT_3264 0xc2
74#define PTRACE_POKEDATA_3264 0xc3
75#define PTRACE_GET_THREAD_AREA_3264 0xc4
76
77/* Read and write watchpoint registers. */
78enum pt_watch_style {
79 pt_watch_style_mips32,
80 pt_watch_style_mips64
81};
82struct mips32_watch_regs {
83 unsigned int watchlo[8];
84 /* Lower 16 bits of watchhi. */
85 unsigned short watchhi[8];
86 /* Valid mask and I R W bits.
87 * bit 0 -- 1 if W bit is usable.
88 * bit 1 -- 1 if R bit is usable.
89 * bit 2 -- 1 if I bit is usable.
90 * bits 3 - 11 -- Valid watchhi mask bits.
91 */
92 unsigned short watch_masks[8];
93 /* The number of valid watch register pairs. */
94 unsigned int num_valid;
95} __attribute__((aligned(8)));
96
97struct mips64_watch_regs {
98 unsigned long long watchlo[8];
99 unsigned short watchhi[8];
100 unsigned short watch_masks[8];
101 unsigned int num_valid;
102} __attribute__((aligned(8)));
103
104struct pt_watch_regs {
105 enum pt_watch_style style;
106 union {
107 struct mips32_watch_regs mips32;
108 struct mips64_watch_regs mips64;
109 };
110};
111
112#define PTRACE_GET_WATCH_REGS 0xd0
113#define PTRACE_SET_WATCH_REGS 0xd1
114
115#ifdef __KERNEL__
116
117#include <linux/compiler.h>
118#include <linux/linkage.h>
119#include <linux/types.h>
120#include <asm/isadep.h>
121
122struct task_struct;
123
124extern int ptrace_getregs(struct task_struct *child, __s64 __user *data);
125extern int ptrace_setregs(struct task_struct *child, __s64 __user *data);
126
127extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
128extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
129
130extern int ptrace_get_watch_regs(struct task_struct *child,
131 struct pt_watch_regs __user *addr);
132extern int ptrace_set_watch_regs(struct task_struct *child,
133 struct pt_watch_regs __user *addr);
134
135/*
136 * Does the process account for user or for system time?
137 */
138#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
139
140#define regs_return_value(_regs) ((_regs)->regs[2])
141#define instruction_pointer(regs) ((regs)->cp0_epc)
142#define profile_pc(regs) instruction_pointer(regs)
143
144extern asmlinkage void syscall_trace_enter(struct pt_regs *regs);
145extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
146
147extern NORET_TYPE void die(const char *, struct pt_regs *) ATTRIB_NORET;
148
149static inline void die_if_kernel(const char *str, struct pt_regs *regs)
150{
151 if (unlikely(!user_mode(regs)))
152 die(str, regs);
153}
154
155#endif
156
157#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 regs->cp0_cause &= ~CAUSEF_BD;
64}
65
66/* Query offset/name of register from its name/offset */
67extern int regs_query_register_offset(const char *name);
68#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
69
70/**
71 * regs_get_register() - get register value from its offset
72 * @regs: pt_regs from which register value is gotten.
73 * @offset: offset number of the register.
74 *
75 * regs_get_register returns the value of a register. The @offset is the
76 * offset of the register in struct pt_regs address which specified by @regs.
77 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
78 */
79static inline unsigned long regs_get_register(struct pt_regs *regs,
80 unsigned int offset)
81{
82 if (unlikely(offset > MAX_REG_OFFSET))
83 return 0;
84
85 return *(unsigned long *)((unsigned long)regs + offset);
86}
87
88/**
89 * regs_within_kernel_stack() - check the address in the stack
90 * @regs: pt_regs which contains kernel stack pointer.
91 * @addr: address which is checked.
92 *
93 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
94 * If @addr is within the kernel stack, it returns true. If not, returns false.
95 */
96static inline int regs_within_kernel_stack(struct pt_regs *regs,
97 unsigned long addr)
98{
99 return ((addr & ~(THREAD_SIZE - 1)) ==
100 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
101}
102
103/**
104 * regs_get_kernel_stack_nth() - get Nth entry of the stack
105 * @regs: pt_regs which contains kernel stack pointer.
106 * @n: stack entry number.
107 *
108 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
109 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
110 * this returns 0.
111 */
112static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
113 unsigned int n)
114{
115 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
116
117 addr += n;
118 if (regs_within_kernel_stack(regs, (unsigned long)addr))
119 return *addr;
120 else
121 return 0;
122}
123
124struct task_struct;
125
126extern int ptrace_getregs(struct task_struct *child,
127 struct user_pt_regs __user *data);
128extern int ptrace_setregs(struct task_struct *child,
129 struct user_pt_regs __user *data);
130
131extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
132extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
133
134extern int ptrace_get_watch_regs(struct task_struct *child,
135 struct pt_watch_regs __user *addr);
136extern int ptrace_set_watch_regs(struct task_struct *child,
137 struct pt_watch_regs __user *addr);
138
139/*
140 * Does the process account for user or for system time?
141 */
142#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
143
144static inline int is_syscall_success(struct pt_regs *regs)
145{
146 return !regs->regs[7];
147}
148
149static inline long regs_return_value(struct pt_regs *regs)
150{
151 if (is_syscall_success(regs) || !user_mode(regs))
152 return regs->regs[2];
153 else
154 return -regs->regs[2];
155}
156
157#define instruction_pointer(regs) ((regs)->cp0_epc)
158extern unsigned long exception_ip(struct pt_regs *regs);
159#define exception_ip(regs) exception_ip(regs)
160#define profile_pc(regs) instruction_pointer(regs)
161
162extern asmlinkage long syscall_trace_enter(struct pt_regs *regs);
163extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
164
165extern void die(const char *, struct pt_regs *) __noreturn;
166
167static inline void die_if_kernel(const char *str, struct pt_regs *regs)
168{
169 if (unlikely(!user_mode(regs)))
170 die(str, regs);
171}
172
173#define current_pt_regs() \
174({ \
175 unsigned long sp = (unsigned long)__builtin_frame_address(0); \
176 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
177})
178
179/* Helpers for working with the user stack pointer */
180
181static inline unsigned long user_stack_pointer(struct pt_regs *regs)
182{
183 return regs->regs[29];
184}
185
186static inline void user_stack_pointer_set(struct pt_regs *regs,
187 unsigned long val)
188{
189 regs->regs[29] = val;
190}
191
192#endif /* _ASM_PTRACE_H */