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 /* 0 - 31 are integer registers, 32 - 63 are fp registers.  */
  13 #define FPR_BASE        32
  14 #define PC              64
  15 #define CAUSE           65
  16 #define BADVADDR        66
  17 #define MMHI            67
  18 #define MMLO            68
  19 #define FPC_CSR         69
  20 #define FPC_EIR         70
  21 #define DSP_BASE        71              /* 3 more hi / lo register pairs */
  22 #define DSP_CONTROL     77
  23 #define ACX             78
  24
  25 /*
  26  * This struct defines the way the registers are stored on the stack during a
  27  * system call/exception. As usual the registers k0/k1 aren't being saved.
  28  */
  29 struct pt_regs {
  30 #ifdef CONFIG_32BIT
  31         /* Pad bytes for argument save space on the stack. */
  32         unsigned long pad0[6];
  33 #endif
  34
  35         /* Saved main processor registers. */
  36         unsigned long regs[32];
  37
  38         /* Saved special registers. */
  39         unsigned long cp0_status;
  40         unsigned long hi;
  41         unsigned long lo;
  42 #ifdef CONFIG_CPU_HAS_SMARTMIPS
  43         unsigned long acx;
  44 #endif
  45         unsigned long cp0_badvaddr;
  46         unsigned long cp0_cause;
  47         unsigned long cp0_epc;
  48 #ifdef CONFIG_MIPS_MT_SMTC
  49         unsigned long cp0_tcstatus;
  50 #endif /* CONFIG_MIPS_MT_SMTC */
  51 #ifdef CONFIG_CPU_CAVIUM_OCTEON
  52         unsigned long long mpl[3];        /* MTM{0,1,2} */
  53         unsigned long long mtp[3];        /* MTP{0,1,2} */
  54 #endif
  55 } __attribute__ ((aligned (8)));
  56
  57 /* Arbitrarily choose the same ptrace numbers as used by the Sparc code. */
  58 #define PTRACE_GETREGS          12
  59 #define PTRACE_SETREGS          13
  60 #define PTRACE_GETFPREGS                14
  61 #define PTRACE_SETFPREGS                15
  62 /* #define PTRACE_GETFPXREGS            18 */
  63 /* #define PTRACE_SETFPXREGS            19 */
  64
  65 #define PTRACE_OLDSETOPTIONS    21
  66
  67 #define PTRACE_GET_THREAD_AREA  25
  68 #define PTRACE_SET_THREAD_AREA  26
  69
  70 /* Calls to trace a 64bit program from a 32bit program.  */
  71 #define PTRACE_PEEKTEXT_3264    0xc0
  72 #define PTRACE_PEEKDATA_3264    0xc1
  73 #define PTRACE_POKETEXT_3264    0xc2
  74 #define PTRACE_POKEDATA_3264    0xc3
  75 #define PTRACE_GET_THREAD_AREA_3264     0xc4
  76
  77 /* Read and write watchpoint registers.  */
  78 enum pt_watch_style {
  79         pt_watch_style_mips32,
  80         pt_watch_style_mips64
  81 };
  82 struct mips32_watch_regs {
  83         unsigned int watchlo[8];
  84         /* Lower 16 bits of watchhi. */
  85         unsigned short watchhi[8];
  86         /* Valid mask and I R W bits.
  87          * bit 0 -- 1 if W bit is usable.
  88          * bit 1 -- 1 if R bit is usable.
  89          * bit 2 -- 1 if I bit is usable.
  90          * bits 3 - 11 -- Valid watchhi mask bits.
  91          */
  92         unsigned short watch_masks[8];
  93         /* The number of valid watch register pairs.  */
  94         unsigned int num_valid;
  95 } __attribute__((aligned(8)));
  96
  97 struct mips64_watch_regs {
  98         unsigned long long watchlo[8];
  99         unsigned short watchhi[8];
 100         unsigned short watch_masks[8];
 101         unsigned int num_valid;
 102 } __attribute__((aligned(8)));
 103
 104 struct pt_watch_regs {
 105         enum pt_watch_style style;
 106         union {
 107                 struct mips32_watch_regs mips32;
 108                 struct mips64_watch_regs mips64;
 109         };
 110 };
 111
 112 #define PTRACE_GET_WATCH_REGS   0xd0
 113 #define PTRACE_SET_WATCH_REGS   0xd1
 114
 115 #ifdef __KERNEL__
 116
 117 #include <linux/compiler.h>
 118 #include <linux/linkage.h>
 119 #include <linux/types.h>
 120 #include <asm/isadep.h>
 121
 122 struct task_struct;
 123
 124 extern int ptrace_getregs(struct task_struct *child, __s64 __user *data);
 125 extern int ptrace_setregs(struct task_struct *child, __s64 __user *data);
 126
 127 extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
 128 extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
 129
 130 extern int ptrace_get_watch_regs(struct task_struct *child,
 131         struct pt_watch_regs __user *addr);
 132 extern int ptrace_set_watch_regs(struct task_struct *child,
 133         struct pt_watch_regs __user *addr);
 134
 135 /*
 136  * Does the process account for user or for system time?
 137  */
 138 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
 139
 140 static inline int is_syscall_success(struct pt_regs *regs)
 141 {
 142         return !regs->regs[7];
 143 }
 144
 145 static inline long regs_return_value(struct pt_regs *regs)
 146 {
 147         if (is_syscall_success(regs))
 148                 return regs->regs[2];
 149         else
 150                 return -regs->regs[2];
 151 }
 152
 153 #define instruction_pointer(regs) ((regs)->cp0_epc)
 154 #define profile_pc(regs) instruction_pointer(regs)
 155
 156 extern asmlinkage void syscall_trace_enter(struct pt_regs *regs);
 157 extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
 158
 159 extern void die(const char *, struct pt_regs *) __noreturn;
 160
 161 static inline void die_if_kernel(const char *str, struct pt_regs *regs)
 162 {
 163         if (unlikely(!user_mode(regs)))
 164                 die(str, regs);
 165 }
 166
 167 #endif
 168
 169 #endif /* _ASM_PTRACE_H */