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[6]; /* MTM{0-5} */ 44 unsigned long long mtp[6]; /* MTP{0-5} */ 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 */ 115