include/asm-powerpc/ptrace.h

   1 #ifndef _ASM_POWERPC_PTRACE_H
   2 #define _ASM_POWERPC_PTRACE_H
   3
   4 /*
   5  * Copyright (C) 2001 PPC64 Team, IBM Corp
   6  *
   7  * This struct defines the way the registers are stored on the
   8  * kernel stack during a system call or other kernel entry.
   9  *
  10  * this should only contain volatile regs
  11  * since we can keep non-volatile in the thread_struct
  12  * should set this up when only volatiles are saved
  13  * by intr code.
  14  *
  15  * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
  16  * that the overall structure is a multiple of 16 bytes in length.
  17  *
  18  * Note that the offsets of the fields in this struct correspond with
  19  * the PT_* values below.  This simplifies arch/powerpc/kernel/ptrace.c.
  20  *
  21  * This program is free software; you can redistribute it and/or
  22  * modify it under the terms of the GNU General Public License
  23  * as published by the Free Software Foundation; either version
  24  * 2 of the License, or (at your option) any later version.
  25  */
  26
  27 #ifndef __ASSEMBLY__
  28
  29 struct pt_regs {
  30         unsigned long gpr[32];
  31         unsigned long nip;
  32         unsigned long msr;
  33         unsigned long orig_gpr3;        /* Used for restarting system calls */
  34         unsigned long ctr;
  35         unsigned long link;
  36         unsigned long xer;
  37         unsigned long ccr;
  38 #ifdef __powerpc64__
  39         unsigned long softe;            /* Soft enabled/disabled */
  40 #else
  41         unsigned long mq;               /* 601 only (not used at present) */
  42                                         /* Used on APUS to hold IPL value. */
  43 #endif
  44         unsigned long trap;             /* Reason for being here */
  45         /* N.B. for critical exceptions on 4xx, the dar and dsisr
  46            fields are overloaded to hold srr0 and srr1. */
  47         unsigned long dar;              /* Fault registers */
  48         unsigned long dsisr;            /* on 4xx/Book-E used for ESR */
  49         unsigned long result;           /* Result of a system call */
  50 };
  51
  52 #endif /* __ASSEMBLY__ */
  53
  54 #ifdef __KERNEL__
  55
  56 #ifdef __powerpc64__
  57
  58 #define STACK_FRAME_OVERHEAD    112     /* size of minimum stack frame */
  59
  60 /* Size of dummy stack frame allocated when calling signal handler. */
  61 #define __SIGNAL_FRAMESIZE      128
  62 #define __SIGNAL_FRAMESIZE32    64
  63
  64 #else /* __powerpc64__ */
  65
  66 #define STACK_FRAME_OVERHEAD    16      /* size of minimum stack frame */
  67
  68 /* Size of stack frame allocated when calling signal handler. */
  69 #define __SIGNAL_FRAMESIZE      64
  70
  71 #endif /* __powerpc64__ */
  72
  73 #ifndef __ASSEMBLY__
  74
  75 #define instruction_pointer(regs) ((regs)->nip)
  76 #define regs_return_value(regs) ((regs)->gpr[3])
  77
  78 #ifdef CONFIG_SMP
  79 extern unsigned long profile_pc(struct pt_regs *regs);
  80 #else
  81 #define profile_pc(regs) instruction_pointer(regs)
  82 #endif
  83
  84 #ifdef __powerpc64__
  85 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
  86 #else
  87 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
  88 #endif
  89
  90 #define force_successful_syscall_return()   \
  91         do { \
  92                 set_thread_flag(TIF_NOERROR); \
  93         } while(0)
  94
  95 /*
  96  * We use the least-significant bit of the trap field to indicate
  97  * whether we have saved the full set of registers, or only a
  98  * partial set.  A 1 there means the partial set.
  99  * On 4xx we use the next bit to indicate whether the exception
 100  * is a critical exception (1 means it is).
 101  */
 102 #define FULL_REGS(regs)         (((regs)->trap & 1) == 0)
 103 #ifndef __powerpc64__
 104 #define IS_CRITICAL_EXC(regs)   (((regs)->trap & 2) == 0)
 105 #endif /* ! __powerpc64__ */
 106 #define TRAP(regs)              ((regs)->trap & ~0xF)
 107 #ifdef __powerpc64__
 108 #define CHECK_FULL_REGS(regs)   BUG_ON(regs->trap & 1)
 109 #else
 110 #define CHECK_FULL_REGS(regs)                                                 \
 111 do {                                                                          \
 112         if ((regs)->trap & 1)                                                 \
 113                 printk(KERN_CRIT "%s: partial register set\n", __FUNCTION__); \
 114 } while (0)
 115 #endif /* __powerpc64__ */
 116
 117 #endif /* __ASSEMBLY__ */
 118
 119 #endif /* __KERNEL__ */
 120
 121 /*
 122  * Offsets used by 'ptrace' system call interface.
 123  * These can't be changed without breaking binary compatibility
 124  * with MkLinux, etc.
 125  */
 126 #define PT_R0   0
 127 #define PT_R1   1
 128 #define PT_R2   2
 129 #define PT_R3   3
 130 #define PT_R4   4
 131 #define PT_R5   5
 132 #define PT_R6   6
 133 #define PT_R7   7
 134 #define PT_R8   8
 135 #define PT_R9   9
 136 #define PT_R10  10
 137 #define PT_R11  11
 138 #define PT_R12  12
 139 #define PT_R13  13
 140 #define PT_R14  14
 141 #define PT_R15  15
 142 #define PT_R16  16
 143 #define PT_R17  17
 144 #define PT_R18  18
 145 #define PT_R19  19
 146 #define PT_R20  20
 147 #define PT_R21  21
 148 #define PT_R22  22
 149 #define PT_R23  23
 150 #define PT_R24  24
 151 #define PT_R25  25
 152 #define PT_R26  26
 153 #define PT_R27  27
 154 #define PT_R28  28
 155 #define PT_R29  29
 156 #define PT_R30  30
 157 #define PT_R31  31
 158
 159 #define PT_NIP  32
 160 #define PT_MSR  33
 161 #ifdef __KERNEL__
 162 #define PT_ORIG_R3 34
 163 #endif
 164 #define PT_CTR  35
 165 #define PT_LNK  36
 166 #define PT_XER  37
 167 #define PT_CCR  38
 168 #ifndef __powerpc64__
 169 #define PT_MQ   39
 170 #else
 171 #define PT_SOFTE 39
 172 #define PT_TRAP 40
 173 #define PT_DAR  41
 174 #define PT_DSISR 42
 175 #define PT_RESULT 43
 176 #endif
 177
 178 #define PT_FPR0 48      /* each FP reg occupies 2 slots in this space */
 179
 180 #ifndef __powerpc64__
 181
 182 #define PT_FPR31 (PT_FPR0 + 2*31)
 183 #define PT_FPSCR (PT_FPR0 + 2*32 + 1)
 184
 185 #else /* __powerpc64__ */
 186
 187 #define PT_FPSCR (PT_FPR0 + 32) /* each FP reg occupies 1 slot in 64-bit space */
 188
 189 #ifdef __KERNEL__
 190 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
 191 #endif
 192
 193 #define PT_VR0 82       /* each Vector reg occupies 2 slots in 64-bit */
 194 #define PT_VSCR (PT_VR0 + 32*2 + 1)
 195 #define PT_VRSAVE (PT_VR0 + 33*2)
 196
 197 #ifdef __KERNEL__
 198 #define PT_VR0_32 164   /* each Vector reg occupies 4 slots in 32-bit */
 199 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
 200 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
 201 #endif
 202
 203 #endif /* __powerpc64__ */
 204
 205 /*
 206  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
 207  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
 208  * corresponding vector registers.  Quadword 32 contains the vscr as the
 209  * last word (offset 12) within that quadword.  Quadword 33 contains the
 210  * vrsave as the first word (offset 0) within the quadword.
 211  *
 212  * This definition of the VMX state is compatible with the current PPC32
 213  * ptrace interface.  This allows signal handling and ptrace to use the same
 214  * structures.  This also simplifies the implementation of a bi-arch
 215  * (combined (32- and 64-bit) gdb.
 216  */
 217 #define PTRACE_GETVRREGS        18
 218 #define PTRACE_SETVRREGS        19
 219
 220 /* Get/set all the upper 32-bits of the SPE registers, accumulator, and
 221  * spefscr, in one go */
 222 #define PTRACE_GETEVRREGS       20
 223 #define PTRACE_SETEVRREGS       21
 224
 225 /*
 226  * Get or set a debug register. The first 16 are DABR registers and the
 227  * second 16 are IABR registers.
 228  */
 229 #define PTRACE_GET_DEBUGREG     25
 230 #define PTRACE_SET_DEBUGREG     26
 231
 232 /* Additional PTRACE requests implemented on PowerPC. */
 233 #define PPC_PTRACE_GETREGS      0x99    /* Get GPRs 0 - 31 */
 234 #define PPC_PTRACE_SETREGS      0x98    /* Set GPRs 0 - 31 */
 235 #define PPC_PTRACE_GETFPREGS    0x97    /* Get FPRs 0 - 31 */
 236 #define PPC_PTRACE_SETFPREGS    0x96    /* Set FPRs 0 - 31 */
 237
 238 /* Calls to trace a 64bit program from a 32bit program */
 239 #define PPC_PTRACE_PEEKTEXT_3264 0x95
 240 #define PPC_PTRACE_PEEKDATA_3264 0x94
 241 #define PPC_PTRACE_POKETEXT_3264 0x93
 242 #define PPC_PTRACE_POKEDATA_3264 0x92
 243 #define PPC_PTRACE_PEEKUSR_3264  0x91
 244 #define PPC_PTRACE_POKEUSR_3264  0x90
 245
 246 #endif /* _ASM_POWERPC_PTRACE_H */