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[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
  51 struct task_struct;
  52
  53 extern int ptrace_getregs(struct task_struct *child, __s64 __user *data);
  54 extern int ptrace_setregs(struct task_struct *child, __s64 __user *data);
  55
  56 extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
  57 extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
  58
  59 extern int ptrace_get_watch_regs(struct task_struct *child,
  60         struct pt_watch_regs __user *addr);
  61 extern 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
  69 static inline int is_syscall_success(struct pt_regs *regs)
  70 {
  71         return !regs->regs[7];
  72 }
  73
  74 static 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
  85 extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
  86 extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
  87
  88 extern void die(const char *, struct pt_regs *) __noreturn;
  89
  90 static inline void die_if_kernel(const char *str, struct pt_regs *regs)
  91 {
  92         if (unlikely(!user_mode(regs)))
  93                 die(str, regs);
  94 }
  95
  96 #define current_pt_regs()                                               \
  97 ({                                                                      \
  98         unsigned long sp = (unsigned long)__builtin_frame_address(0);   \
  99         (struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1;      \
 100 })
 101
 102 /* Helpers for working with the user stack pointer */
 103
 104 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
 105 {
 106         return regs->regs[29];
 107 }
 108
 109 static inline void user_stack_pointer_set(struct pt_regs *regs,
 110         unsigned long val)
 111 {
 112         regs->regs[29] = val;
 113 }
 114
 115 #endif /* _ASM_PTRACE_H */