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1da177e4 LT |
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 | ||
1da177e4 | 12 | |
0926bf95 | 13 | #include <linux/compiler.h> |
1da177e4 | 14 | #include <linux/linkage.h> |
f6a3176a | 15 | #include <linux/types.h> |
8f9a2b32 | 16 | #include <asm/isadep.h> |
40e084a5 RB |
17 | #include <asm/page.h> |
18 | #include <asm/thread_info.h> | |
61730c53 | 19 | #include <uapi/asm/ptrace.h> |
1da177e4 | 20 | |
8f657933 DD |
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. | |
40e084a5 RB |
24 | * |
25 | * If you add a register here, also add it to regoffset_table[] in | |
26 | * arch/mips/kernel/ptrace.c. | |
8f657933 DD |
27 | */ |
28 | struct pt_regs { | |
29 | #ifdef CONFIG_32BIT | |
30 | /* Pad bytes for argument save space on the stack. */ | |
e90e6fdd | 31 | unsigned long pad0[8]; |
8f657933 DD |
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; | |
8f657933 | 47 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
ac655fb7 DD |
48 | unsigned long long mpl[6]; /* MTM{0-5} */ |
49 | unsigned long long mtp[6]; /* MTP{0-5} */ | |
8f657933 | 50 | #endif |
40e084a5 | 51 | unsigned long __last[0]; |
8f657933 DD |
52 | } __aligned(8); |
53 | ||
40e084a5 RB |
54 | static 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 | ||
64 | static 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 */ | |
71 | extern 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 | */ | |
83 | static 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 | */ | |
100 | static 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 | */ | |
116 | static 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 | ||
0926bf95 DD |
128 | struct task_struct; |
129 | ||
a79ebea6 AS |
130 | extern int ptrace_getregs(struct task_struct *child, |
131 | struct user_pt_regs __user *data); | |
132 | extern int ptrace_setregs(struct task_struct *child, | |
133 | struct user_pt_regs __user *data); | |
d302d05c RB |
134 | |
135 | extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data); | |
136 | extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data); | |
137 | ||
0926bf95 DD |
138 | extern int ptrace_get_watch_regs(struct task_struct *child, |
139 | struct pt_watch_regs __user *addr); | |
140 | extern int ptrace_set_watch_regs(struct task_struct *child, | |
141 | struct pt_watch_regs __user *addr); | |
142 | ||
1da177e4 LT |
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 | ||
d7e7528b EP |
148 | static inline int is_syscall_success(struct pt_regs *regs) |
149 | { | |
150 | return !regs->regs[7]; | |
151 | } | |
152 | ||
153 | static 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 | ||
1da177e4 LT |
161 | #define instruction_pointer(regs) ((regs)->cp0_epc) |
162 | #define profile_pc(regs) instruction_pointer(regs) | |
163 | ||
4c21b8fd | 164 | extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall); |
8b659a39 | 165 | extern asmlinkage void syscall_trace_leave(struct pt_regs *regs); |
1da177e4 | 166 | |
ff2d8b19 | 167 | extern void die(const char *, struct pt_regs *) __noreturn; |
2d911e9a | 168 | |
ce384d83 | 169 | static inline void die_if_kernel(const char *str, struct pt_regs *regs) |
2d911e9a RB |
170 | { |
171 | if (unlikely(!user_mode(regs))) | |
172 | die(str, regs); | |
173 | } | |
174 | ||
baf9ff74 RB |
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 | ||
c0ff3c53 RB |
181 | /* Helpers for working with the user stack pointer */ |
182 | ||
183 | static inline unsigned long user_stack_pointer(struct pt_regs *regs) | |
184 | { | |
185 | return regs->regs[29]; | |
186 | } | |
187 | ||
188 | static inline void user_stack_pointer_set(struct pt_regs *regs, | |
189 | unsigned long val) | |
190 | { | |
191 | regs->regs[29] = val; | |
192 | } | |
193 | ||
1da177e4 | 194 | #endif /* _ASM_PTRACE_H */ |