arch/powerpc/include/asm/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 #define STACK_FRAME_LR_SAVE     2       /* Location of LR in stack frame */
  60 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
  61 #define STACK_INT_FRAME_SIZE    (sizeof(struct pt_regs) + \
  62                                         STACK_FRAME_OVERHEAD + 288)
  63 #define STACK_FRAME_MARKER      12
  64
  65 /* Size of dummy stack frame allocated when calling signal handler. */
  66 #define __SIGNAL_FRAMESIZE      128
  67 #define __SIGNAL_FRAMESIZE32    64
  68
  69 #else /* __powerpc64__ */
  70
  71 #define STACK_FRAME_OVERHEAD    16      /* size of minimum stack frame */
  72 #define STACK_FRAME_LR_SAVE     1       /* Location of LR in stack frame */
  73 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
  74 #define STACK_INT_FRAME_SIZE    (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
  75 #define STACK_FRAME_MARKER      2
  76
  77 /* Size of stack frame allocated when calling signal handler. */
  78 #define __SIGNAL_FRAMESIZE      64
  79
  80 #endif /* __powerpc64__ */
  81
  82 #ifndef __ASSEMBLY__
  83
  84 #define instruction_pointer(regs) ((regs)->nip)
  85 #define user_stack_pointer(regs) ((regs)->gpr[1])
  86 #define regs_return_value(regs) ((regs)->gpr[3])
  87
  88 #ifdef CONFIG_SMP
  89 extern unsigned long profile_pc(struct pt_regs *regs);
  90 #else
  91 #define profile_pc(regs) instruction_pointer(regs)
  92 #endif
  93
  94 #ifdef __powerpc64__
  95 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
  96 #else
  97 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
  98 #endif
  99
 100 #define force_successful_syscall_return()   \
 101         do { \
 102                 set_thread_flag(TIF_NOERROR); \
 103         } while(0)
 104
 105 struct task_struct;
 106 extern unsigned long ptrace_get_reg(struct task_struct *task, int regno);
 107 extern int ptrace_put_reg(struct task_struct *task, int regno,
 108                           unsigned long data);
 109
 110 /*
 111  * We use the least-significant bit of the trap field to indicate
 112  * whether we have saved the full set of registers, or only a
 113  * partial set.  A 1 there means the partial set.
 114  * On 4xx we use the next bit to indicate whether the exception
 115  * is a critical exception (1 means it is).
 116  */
 117 #define FULL_REGS(regs)         (((regs)->trap & 1) == 0)
 118 #ifndef __powerpc64__
 119 #define IS_CRITICAL_EXC(regs)   (((regs)->trap & 2) != 0)
 120 #define IS_MCHECK_EXC(regs)     (((regs)->trap & 4) != 0)
 121 #define IS_DEBUG_EXC(regs)      (((regs)->trap & 8) != 0)
 122 #endif /* ! __powerpc64__ */
 123 #define TRAP(regs)              ((regs)->trap & ~0xF)
 124 #ifdef __powerpc64__
 125 #define CHECK_FULL_REGS(regs)   BUG_ON(regs->trap & 1)
 126 #else
 127 #define CHECK_FULL_REGS(regs)                                                 \
 128 do {                                                                          \
 129         if ((regs)->trap & 1)                                                 \
 130                 printk(KERN_CRIT "%s: partial register set\n", __func__); \
 131 } while (0)
 132 #endif /* __powerpc64__ */
 133
 134 /*
 135  * These are defined as per linux/ptrace.h, which see.
 136  */
 137 #define arch_has_single_step()  (1)
 138 #define arch_has_block_step()   (!cpu_has_feature(CPU_FTR_601))
 139 extern void user_enable_single_step(struct task_struct *);
 140 extern void user_enable_block_step(struct task_struct *);
 141 extern void user_disable_single_step(struct task_struct *);
 142
 143 #endif /* __ASSEMBLY__ */
 144
 145 #endif /* __KERNEL__ */
 146
 147 /*
 148  * Offsets used by 'ptrace' system call interface.
 149  * These can't be changed without breaking binary compatibility
 150  * with MkLinux, etc.
 151  */
 152 #define PT_R0   0
 153 #define PT_R1   1
 154 #define PT_R2   2
 155 #define PT_R3   3
 156 #define PT_R4   4
 157 #define PT_R5   5
 158 #define PT_R6   6
 159 #define PT_R7   7
 160 #define PT_R8   8
 161 #define PT_R9   9
 162 #define PT_R10  10
 163 #define PT_R11  11
 164 #define PT_R12  12
 165 #define PT_R13  13
 166 #define PT_R14  14
 167 #define PT_R15  15
 168 #define PT_R16  16
 169 #define PT_R17  17
 170 #define PT_R18  18
 171 #define PT_R19  19
 172 #define PT_R20  20
 173 #define PT_R21  21
 174 #define PT_R22  22
 175 #define PT_R23  23
 176 #define PT_R24  24
 177 #define PT_R25  25
 178 #define PT_R26  26
 179 #define PT_R27  27
 180 #define PT_R28  28
 181 #define PT_R29  29
 182 #define PT_R30  30
 183 #define PT_R31  31
 184
 185 #define PT_NIP  32
 186 #define PT_MSR  33
 187 #define PT_ORIG_R3 34
 188 #define PT_CTR  35
 189 #define PT_LNK  36
 190 #define PT_XER  37
 191 #define PT_CCR  38
 192 #ifndef __powerpc64__
 193 #define PT_MQ   39
 194 #else
 195 #define PT_SOFTE 39
 196 #endif
 197 #define PT_TRAP 40
 198 #define PT_DAR  41
 199 #define PT_DSISR 42
 200 #define PT_RESULT 43
 201 #define PT_REGS_COUNT 44
 202
 203 #define PT_FPR0 48      /* each FP reg occupies 2 slots in this space */
 204
 205 #ifndef __powerpc64__
 206
 207 #define PT_FPR31 (PT_FPR0 + 2*31)
 208 #define PT_FPSCR (PT_FPR0 + 2*32 + 1)
 209
 210 #else /* __powerpc64__ */
 211
 212 #define PT_FPSCR (PT_FPR0 + 32) /* each FP reg occupies 1 slot in 64-bit space */
 213
 214 #ifdef __KERNEL__
 215 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
 216 #endif
 217
 218 #define PT_VR0 82       /* each Vector reg occupies 2 slots in 64-bit */
 219 #define PT_VSCR (PT_VR0 + 32*2 + 1)
 220 #define PT_VRSAVE (PT_VR0 + 33*2)
 221
 222 #ifdef __KERNEL__
 223 #define PT_VR0_32 164   /* each Vector reg occupies 4 slots in 32-bit */
 224 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
 225 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
 226 #endif
 227
 228 /*
 229  * Only store first 32 VSRs here. The second 32 VSRs in VR0-31
 230  */
 231 #define PT_VSR0 150     /* each VSR reg occupies 2 slots in 64-bit */
 232 #define PT_VSR31 (PT_VSR0 + 2*31)
 233 #ifdef __KERNEL__
 234 #define PT_VSR0_32 300  /* each VSR reg occupies 4 slots in 32-bit */
 235 #endif
 236 #endif /* __powerpc64__ */
 237
 238 /*
 239  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
 240  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
 241  * corresponding vector registers.  Quadword 32 contains the vscr as the
 242  * last word (offset 12) within that quadword.  Quadword 33 contains the
 243  * vrsave as the first word (offset 0) within the quadword.
 244  *
 245  * This definition of the VMX state is compatible with the current PPC32
 246  * ptrace interface.  This allows signal handling and ptrace to use the same
 247  * structures.  This also simplifies the implementation of a bi-arch
 248  * (combined (32- and 64-bit) gdb.
 249  */
 250 #define PTRACE_GETVRREGS        18
 251 #define PTRACE_SETVRREGS        19
 252
 253 /* Get/set all the upper 32-bits of the SPE registers, accumulator, and
 254  * spefscr, in one go */
 255 #define PTRACE_GETEVRREGS       20
 256 #define PTRACE_SETEVRREGS       21
 257
 258 /* Get the first 32 128bit VSX registers */
 259 #define PTRACE_GETVSRREGS       27
 260 #define PTRACE_SETVSRREGS       28
 261
 262 /*
 263  * Get or set a debug register. The first 16 are DABR registers and the
 264  * second 16 are IABR registers.
 265  */
 266 #define PTRACE_GET_DEBUGREG     25
 267 #define PTRACE_SET_DEBUGREG     26
 268
 269 /* (new) PTRACE requests using the same numbers as x86 and the same
 270  * argument ordering. Additionally, they support more registers too
 271  */
 272 #define PTRACE_GETREGS            12
 273 #define PTRACE_SETREGS            13
 274 #define PTRACE_GETFPREGS          14
 275 #define PTRACE_SETFPREGS          15
 276 #define PTRACE_GETREGS64          22
 277 #define PTRACE_SETREGS64          23
 278
 279 /* (old) PTRACE requests with inverted arguments */
 280 #define PPC_PTRACE_GETREGS      0x99    /* Get GPRs 0 - 31 */
 281 #define PPC_PTRACE_SETREGS      0x98    /* Set GPRs 0 - 31 */
 282 #define PPC_PTRACE_GETFPREGS    0x97    /* Get FPRs 0 - 31 */
 283 #define PPC_PTRACE_SETFPREGS    0x96    /* Set FPRs 0 - 31 */
 284
 285 /* Calls to trace a 64bit program from a 32bit program */
 286 #define PPC_PTRACE_PEEKTEXT_3264 0x95
 287 #define PPC_PTRACE_PEEKDATA_3264 0x94
 288 #define PPC_PTRACE_POKETEXT_3264 0x93
 289 #define PPC_PTRACE_POKEDATA_3264 0x92
 290 #define PPC_PTRACE_PEEKUSR_3264  0x91
 291 #define PPC_PTRACE_POKEUSR_3264  0x90
 292
 293 #define PTRACE_SINGLEBLOCK      0x100   /* resume execution until next branch */
 294
 295 #endif /* _ASM_POWERPC_PTRACE_H */