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 */
23 struct pt_regs {
24 #ifdef CONFIG_32BIT
25 /* Pad bytes for argument save space on the stack. */
26 unsigned long pad0[8];
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
51 struct task_struct;
52
53 extern int ptrace_getregs(struct task_struct *child,
54 struct user_pt_regs __user *data);
55 extern int ptrace_setregs(struct task_struct *child,
56 struct user_pt_regs __user *data);
57
58 extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
59 extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
60
61 extern int ptrace_get_watch_regs(struct task_struct *child,
62 struct pt_watch_regs __user *addr);
63 extern int ptrace_set_watch_regs(struct task_struct *child,
64 struct pt_watch_regs __user *addr);
65
66 int mips_vdso_ptrace_get(struct task_struct *child, unsigned long addr,
67 unsigned long data, int size);
68
69 /*
70 * Does the process account for user or for system time?
71 */
72 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
73
is_syscall_success(struct pt_regs * regs)74 static inline int is_syscall_success(struct pt_regs *regs)
75 {
76 return !regs->regs[7];
77 }
78
regs_return_value(struct pt_regs * regs)79 static inline long regs_return_value(struct pt_regs *regs)
80 {
81 if (is_syscall_success(regs))
82 return regs->regs[2];
83 else
84 return -regs->regs[2];
85 }
86
87 #define instruction_pointer(regs) ((regs)->cp0_epc)
88 #define profile_pc(regs) instruction_pointer(regs)
89
90 extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
91 extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
92
93 extern void die(const char *, struct pt_regs *) __noreturn;
94
die_if_kernel(const char * str,struct pt_regs * regs)95 static inline void die_if_kernel(const char *str, struct pt_regs *regs)
96 {
97 if (unlikely(!user_mode(regs)))
98 die(str, regs);
99 }
100
101 #define current_pt_regs() \
102 ({ \
103 unsigned long sp = (unsigned long)__builtin_frame_address(0); \
104 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
105 })
106
107 /* Helpers for working with the user stack pointer */
108
user_stack_pointer(struct pt_regs * regs)109 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
110 {
111 return regs->regs[29];
112 }
113
user_stack_pointer_set(struct pt_regs * regs,unsigned long val)114 static inline void user_stack_pointer_set(struct pt_regs *regs,
115 unsigned long val)
116 {
117 regs->regs[29] = val;
118 }
119
120 #endif /* _ASM_PTRACE_H */
121