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ptrace.h
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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 struct task_struct;
20 
21 extern int ptrace_getregs(struct task_struct *child, __s64 __user *data);
22 extern int ptrace_setregs(struct task_struct *child, __s64 __user *data);
23 
24 extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
25 extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
26 
27 extern int ptrace_get_watch_regs(struct task_struct *child,
28  struct pt_watch_regs __user *addr);
29 extern int ptrace_set_watch_regs(struct task_struct *child,
30  struct pt_watch_regs __user *addr);
31 
32 /*
33  * Does the process account for user or for system time?
34  */
35 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
36 
37 static inline int is_syscall_success(struct pt_regs *regs)
38 {
39  return !regs->regs[7];
40 }
41 
42 static inline long regs_return_value(struct pt_regs *regs)
43 {
44  if (is_syscall_success(regs))
45  return regs->regs[2];
46  else
47  return -regs->regs[2];
48 }
49 
50 #define instruction_pointer(regs) ((regs)->cp0_epc)
51 #define profile_pc(regs) instruction_pointer(regs)
52 
53 extern asmlinkage void syscall_trace_enter(struct pt_regs *regs);
54 extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
55 
56 extern void die(const char *, struct pt_regs *) __noreturn;
57 
58 static inline void die_if_kernel(const char *str, struct pt_regs *regs)
59 {
60  if (unlikely(!user_mode(regs)))
61  die(str, regs);
62 }
63 
64 #endif /* _ASM_PTRACE_H */