sysdeps/powerpc/powerpc32/register-dump.h

   1 /* Dump registers.
   2    Copyright (C) 1998-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/uio.h>
  20 #include <_itoa.h>
  21
  22 /* This prints out the information in the following form: */
  23 static const char dumpform[] = "\
  24 Register dump:\n\
  25 fp0-3:   0000030%0000031% 0000032%0000033% 0000034%0000035% 0000036%0000037%\n\
  26 fp4-7:   0000038%0000039% 000003a%000003b% 000003c%000003d% 000003e%000003f%\n\
  27 fp8-11:  0000040%0000041% 0000042%0000043% 0000044%0000045% 0000046%0000047%\n\
  28 fp12-15: 0000048%0000049% 000004a%000004b% 000004c%000004d% 000004e%000004f%\n\
  29 fp16-19: 0000050%0000051% 0000052%0000053% 0000054%0000055% 0000056%0000057%\n\
  30 fp20-23: 0000058%0000059% 000005a%000005b% 000005c%000005d% 000005e%000005f%\n\
  31 fp24-27: 0000060%0000061% 0000062%0000063% 0000064%0000065% 0000066%0000067%\n\
  32 fp28-31: 0000068%0000069% 000006a%000006b% 000006c%000006d% 000006e%000006f%\n\
  33 r0 =0000000% sp =0000001% r2 =0000002% r3 =0000003%  trap=0000028%\n\
  34 r4 =0000004% r5 =0000005% r6 =0000006% r7 =0000007%   sr0=0000020% sr1=0000021%\n\
  35 r8 =0000008% r9 =0000009% r10=000000a% r11=000000b%   dar=0000029% dsi=000002a%\n\
  36 r12=000000c% r13=000000d% r14=000000e% r15=000000f%   r3*=0000022%\n\
  37 r16=0000010% r17=0000011% r18=0000012% r19=0000013%\n\
  38 r20=0000014% r21=0000015% r22=0000016% r23=0000017%    lr=0000024% xer=0000025%\n\
  39 r24=0000018% r25=0000019% r26=000001a% r27=000001b%    mq=0000027% ctr=0000023%\n\
  40 r28=000001c% r29=000001d% r30=000001e% r31=000001f%  fscr=0000071% ccr=0000026%\n\
  41 ";
  42
  43 /* Most of the fields are self-explanatory.  'sr0' is the next
  44    instruction to execute, from SRR0, which may have some relationship
  45    with the instruction that caused the exception.  'r3*' is the value
  46    that will be returned in register 3 when the current system call
  47    returns.  'sr1' is SRR1, bits 16-31 of which are copied from the MSR:
  48
  49    16 - External interrupt enable
  50    17 - Privilege level (1=user, 0=supervisor)
  51    18 - FP available
  52    19 - Machine check enable (if clear, processor locks up on machine check)
  53    20 - FP exception mode bit 0 (FP exceptions recoverable)
  54    21 - Single-step trace enable
  55    22 - Branch trace enable
  56    23 - FP exception mode bit 1
  57    25 - exception prefix (if set, exceptions are taken from 0xFFFnnnnn,
  58         otherwise from 0x000nnnnn).
  59    26 - Instruction address translation enabled.
  60    27 - Data address translation enabled.
  61    30 - Exception is recoverable (otherwise, don't try to return).
  62    31 - Little-endian mode enable.
  63
  64    'Trap' is the address of the exception:
  65
  66    00200 - Machine check exception (memory parity error, for instance)
  67    00300 - Data access exception (memory not mapped, see dsisr for why)
  68    00400 - Instruction access exception (memory not mapped)
  69    00500 - External interrupt
  70    00600 - Alignment exception (see dsisr for more information)
  71    00700 - Program exception (illegal/trap instruction, FP exception)
  72    00800 - FP unavailable (should not be seen by user code)
  73    00900 - Decrementer exception (for instance, SIGALRM)
  74    00A00 - I/O controller interface exception
  75    00C00 - System call exception (for instance, kill(3)).
  76    00E00 - FP assist exception (optional FP instructions, etc.)
  77
  78    'dar' is the memory location, for traps 00300, 00400, 00600, 00A00.
  79    'dsisr' has the following bits under trap 00300:
  80    0 - direct-store error exception
  81    1 - no page table entry for page
  82    4 - memory access not permitted
  83    5 - trying to access I/O controller space or using lwarx/stwcx on
  84        non-write-cached memory
  85    6 - access was store
  86    9 - data access breakpoint hit
  87    10 - segment table search failed to find translation (64-bit ppcs only)
  88    11 - I/O controller instruction not permitted
  89    For trap 00400, the same bits are set in SRR1 instead.
  90    For trap 00600, bits 12-31 of the DSISR set to allow emulation of
  91    the instruction without actually having to read it from memory.
  92 */
  93
  94 #define xtoi(x) (x >= 'a' ? x + 10 - 'a' : x - '0')
  95
  96 static void
  97 register_dump (int fd, struct sigcontext *ctx)
  98 {
  99   char buffer[sizeof(dumpform)];
 100   char *bufferpos;
 101   unsigned regno;
 102   unsigned *regs = (unsigned *)(ctx->regs);
 103
 104   memcpy(buffer, dumpform, sizeof(dumpform));
 105
 106   /* Generate the output.  */
 107   while ((bufferpos = memchr (buffer, '%', sizeof(dumpform))))
 108     {
 109       regno = xtoi (bufferpos[-1]) | xtoi (bufferpos[-2]) << 4;
 110       memset (bufferpos-2, '0', 3);
 111       _itoa_word (regs[regno], bufferpos+1, 16, 0);
 112     }
 113
 114   /* Write the output.  */
 115   write (fd, buffer, sizeof(buffer) - 1);
 116 }
 117
 118
 119 #define REGISTER_DUMP \
 120   register_dump (fd, ctx)