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[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_CPU_CAVIUM_OCTEON
43	unsigned long long mpl[6];        /* MTM{0-5} */
44	unsigned long long mtp[6];        /* MTP{0-5} */
45#endif
46} __aligned(8);
47
48struct task_struct;
49
50extern int ptrace_getregs(struct task_struct *child,
51	struct user_pt_regs __user *data);
52extern int ptrace_setregs(struct task_struct *child,
53	struct user_pt_regs __user *data);
54
55extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
56extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
57
58extern int ptrace_get_watch_regs(struct task_struct *child,
59	struct pt_watch_regs __user *addr);
60extern int ptrace_set_watch_regs(struct task_struct *child,
61	struct pt_watch_regs __user *addr);
62
63/*
64 * Does the process account for user or for system time?
65 */
66#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
67
68static inline int is_syscall_success(struct pt_regs *regs)
69{
70	return !regs->regs[7];
71}
72
73static inline long regs_return_value(struct pt_regs *regs)
74{
75	if (is_syscall_success(regs))
76		return regs->regs[2];
77	else
78		return -regs->regs[2];
79}
80
81#define instruction_pointer(regs) ((regs)->cp0_epc)
82#define profile_pc(regs) instruction_pointer(regs)
83
84extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
85extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
86
87extern void die(const char *, struct pt_regs *) __noreturn;
88
89static inline void die_if_kernel(const char *str, struct pt_regs *regs)
90{
91	if (unlikely(!user_mode(regs)))
92		die(str, regs);
93}
94
95#define current_pt_regs()						\
96({									\
97	unsigned long sp = (unsigned long)__builtin_frame_address(0);	\
98	(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1;	\
99})
100
101/* Helpers for working with the user stack pointer */
102
103static inline unsigned long user_stack_pointer(struct pt_regs *regs)
104{
105	return regs->regs[29];
106}
107
108static inline void user_stack_pointer_set(struct pt_regs *regs,
109	unsigned long val)
110{
111	regs->regs[29] = val;
112}
113
114#endif /* _ASM_PTRACE_H */
115