arch/mips/include/asm/ptrace.h

   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_CPU_CAVIUM_OCTEON
  43         unsigned long long mpl[3];        /* MTM{0,1,2} */
  44         unsigned long long mtp[3];        /* MTP{0,1,2} */
  45 #endif
  46 } __aligned(8);
  47
  48 struct task_struct;
  49
  50 extern int ptrace_getregs(struct task_struct *child,
  51         struct user_pt_regs __user *data);
  52 extern int ptrace_setregs(struct task_struct *child,
  53         struct user_pt_regs __user *data);
  54
  55 extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
  56 extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
  57
  58 extern int ptrace_get_watch_regs(struct task_struct *child,
  59         struct pt_watch_regs __user *addr);
  60 extern 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
  68 static inline int is_syscall_success(struct pt_regs *regs)
  69 {
  70         return !regs->regs[7];
  71 }
  72
  73 static 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
  84 extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
  85 extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
  86
  87 extern void die(const char *, struct pt_regs *) __noreturn;
  88
  89 static 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
 103 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
 104 {
 105         return regs->regs[29];
 106 }
 107
 108 static 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 */