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Linux kernel mirror (for testing)
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kernel
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linux
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#define user_stack_pointer(r) ((r)->regs[29])
85
86extern asmlinkage void syscall_trace_enter(struct pt_regs *regs);
87extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
88
89extern void die(const char *, struct pt_regs *) __noreturn;
90
91static inline void die_if_kernel(const char *str, struct pt_regs *regs)
92{
93 if (unlikely(!user_mode(regs)))
94 die(str, regs);
95}
96
97#define current_pt_regs() \
98({ \
99 unsigned long sp = (unsigned long)__builtin_frame_address(0); \
100 (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
101})
102
103#endif /* _ASM_PTRACE_H */