opcodes/ppc-dis.c

   1 /* ppc-dis.c -- Disassemble PowerPC instructions
   2    Copyright 1994, 1995, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   3    2008 Free Software Foundation, Inc.
   4    Written by Ian Lance Taylor, Cygnus Support
   5
   6    This file is part of the GNU opcodes library.
   7
   8    This library is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    It is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this file; see the file COPYING.  If not, write to the
  20    Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include <stdio.h>
  24 #include "sysdep.h"
  25 #include "dis-asm.h"
  26 #include "opcode/ppc.h"
  27
  28 /* This file provides several disassembler functions, all of which use
  29    the disassembler interface defined in dis-asm.h.  Several functions
  30    are provided because this file handles disassembly for the PowerPC
  31    in both big and little endian mode and also for the POWER (RS/6000)
  32    chip.  */
  33 static int print_insn_powerpc (bfd_vma, struct disassemble_info *, int,
  34                                ppc_cpu_t);
  35
  36 struct dis_private
  37 {
  38   /* Stash the result of parsing disassembler_options here.  */
  39   ppc_cpu_t dialect;
  40 };
  41
  42 #define POWERPC_DIALECT(INFO) \
  43   (((struct dis_private *) ((INFO)->private_data))->dialect)
  44
  45 /* Determine which set of machines to disassemble for.  PPC403/601 or
  46    BookE.  For convenience, also disassemble instructions supported
  47    by the AltiVec vector unit.  */
  48
  49 static int
  50 powerpc_init_dialect (struct disassemble_info *info)
  51 {
  52   ppc_cpu_t dialect = PPC_OPCODE_PPC;
  53   struct dis_private *priv = calloc (sizeof (*priv), 1);
  54
  55   if (priv == NULL)
  56     return FALSE;
  57
  58   if (BFD_DEFAULT_TARGET_SIZE == 64)
  59     dialect |= PPC_OPCODE_64;
  60
  61   if (info->disassembler_options
  62       && strstr (info->disassembler_options, "ppcps") != NULL)
  63     dialect |= PPC_OPCODE_PPCPS;
  64   else if (info->disassembler_options
  65       && strstr (info->disassembler_options, "booke") != NULL)
  66     dialect |= PPC_OPCODE_BOOKE;
  67   else if ((info->mach == bfd_mach_ppc_e500mc)
  68            || (info->disassembler_options
  69                && strstr (info->disassembler_options, "e500mc") != NULL))
  70     dialect |= (PPC_OPCODE_BOOKE | PPC_OPCODE_ISEL
  71                 | PPC_OPCODE_PMR | PPC_OPCODE_CACHELCK
  72                 | PPC_OPCODE_RFMCI | PPC_OPCODE_E500MC);
  73   else if ((info->mach == bfd_mach_ppc_e500)
  74            || (info->disassembler_options
  75                && strstr (info->disassembler_options, "e500") != NULL))
  76     dialect |= (PPC_OPCODE_BOOKE
  77                 | PPC_OPCODE_SPE | PPC_OPCODE_ISEL
  78                 | PPC_OPCODE_EFS | PPC_OPCODE_BRLOCK
  79                 | PPC_OPCODE_PMR | PPC_OPCODE_CACHELCK
  80                 | PPC_OPCODE_RFMCI | PPC_OPCODE_E500MC);
  81   else if (info->disassembler_options
  82            && strstr (info->disassembler_options, "efs") != NULL)
  83     dialect |= PPC_OPCODE_EFS;
  84   else if (info->disassembler_options
  85            && strstr (info->disassembler_options, "e300") != NULL)
  86     dialect |= PPC_OPCODE_E300 | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON;
  87   else if (info->disassembler_options
  88            && (strstr (info->disassembler_options, "440") != NULL
  89                || strstr (info->disassembler_options, "464") != NULL))
  90     dialect |= PPC_OPCODE_BOOKE | PPC_OPCODE_32
  91       | PPC_OPCODE_440 | PPC_OPCODE_ISEL | PPC_OPCODE_RFMCI;
  92   else
  93     dialect |= (PPC_OPCODE_403 | PPC_OPCODE_601 | PPC_OPCODE_CLASSIC
  94                 | PPC_OPCODE_COMMON | PPC_OPCODE_ALTIVEC);
  95
  96   if (info->disassembler_options
  97       && strstr (info->disassembler_options, "power4") != NULL)
  98     dialect |= PPC_OPCODE_POWER4;
  99
 100   if (info->disassembler_options
 101       && strstr (info->disassembler_options, "power5") != NULL)
 102     dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_POWER5;
 103
 104   if (info->disassembler_options
 105       && strstr (info->disassembler_options, "cell") != NULL)
 106     dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_CELL | PPC_OPCODE_ALTIVEC;
 107
 108   if (info->disassembler_options
 109       && strstr (info->disassembler_options, "power6") != NULL)
 110     dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6
 111                | PPC_OPCODE_ALTIVEC;
 112
 113   if (info->disassembler_options
 114       && strstr (info->disassembler_options, "power7") != NULL)
 115     dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6
 116                | PPC_OPCODE_ALTIVEC | PPC_OPCODE_VSX;
 117
 118   if (info->disassembler_options
 119       && strstr (info->disassembler_options, "vsx") != NULL)
 120     dialect |= PPC_OPCODE_VSX;
 121
 122   if (info->disassembler_options
 123       && strstr (info->disassembler_options, "any") != NULL)
 124     dialect |= PPC_OPCODE_ANY;
 125
 126   if (info->disassembler_options)
 127     {
 128       if (strstr (info->disassembler_options, "32") != NULL)
 129         dialect &= ~PPC_OPCODE_64;
 130       else if (strstr (info->disassembler_options, "64") != NULL)
 131         dialect |= PPC_OPCODE_64;
 132     }
 133
 134   info->private_data = priv;
 135   POWERPC_DIALECT(info) = dialect;
 136
 137   return TRUE;
 138 }
 139
 140 /* Print a big endian PowerPC instruction.  */
 141
 142 int
 143 print_insn_big_powerpc (bfd_vma memaddr, struct disassemble_info *info)
 144 {
 145   if (info->private_data == NULL && !powerpc_init_dialect (info))
 146     return -1;
 147   return print_insn_powerpc (memaddr, info, 1, POWERPC_DIALECT(info));
 148 }
 149
 150 /* Print a little endian PowerPC instruction.  */
 151
 152 int
 153 print_insn_little_powerpc (bfd_vma memaddr, struct disassemble_info *info)
 154 {
 155   if (info->private_data == NULL && !powerpc_init_dialect (info))
 156     return -1;
 157   return print_insn_powerpc (memaddr, info, 0, POWERPC_DIALECT(info));
 158 }
 159
 160 /* Print a POWER (RS/6000) instruction.  */
 161
 162 int
 163 print_insn_rs6000 (bfd_vma memaddr, struct disassemble_info *info)
 164 {
 165   return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER);
 166 }
 167
 168 /* Extract the operand value from the PowerPC or POWER instruction.  */
 169
 170 static long
 171 operand_value_powerpc (const struct powerpc_operand *operand,
 172                        unsigned long insn, ppc_cpu_t dialect)
 173 {
 174   long value;
 175   int invalid;
 176   /* Extract the value from the instruction.  */
 177   if (operand->extract)
 178     value = (*operand->extract) (insn, dialect, &invalid);
 179   else
 180     {
 181       value = (insn >> operand->shift) & operand->bitm;
 182       if ((operand->flags & PPC_OPERAND_SIGNED) != 0)
 183         {
 184           /* BITM is always some number of zeros followed by some
 185              number of ones, followed by some numer of zeros.  */
 186           unsigned long top = operand->bitm;
 187           /* top & -top gives the rightmost 1 bit, so this
 188              fills in any trailing zeros.  */
 189           top |= (top & -top) - 1;
 190           top &= ~(top >> 1);
 191           value = (value ^ top) - top;
 192         }
 193     }
 194
 195   return value;
 196 }
 197
 198 /* Determine whether the optional operand(s) should be printed.  */
 199
 200 static int
 201 skip_optional_operands (const unsigned char *opindex,
 202                         unsigned long insn, ppc_cpu_t dialect)
 203 {
 204   const struct powerpc_operand *operand;
 205
 206   for (; *opindex != 0; opindex++)
 207     {
 208       operand = &powerpc_operands[*opindex];
 209       if ((operand->flags & PPC_OPERAND_NEXT) != 0
 210           || ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
 211               && operand_value_powerpc (operand, insn, dialect) != 0))
 212         return 0;
 213     }
 214
 215   return 1;
 216 }
 217
 218 /* Print a PowerPC or POWER instruction.  */
 219
 220 static int
 221 print_insn_powerpc (bfd_vma memaddr,
 222                     struct disassemble_info *info,
 223                     int bigendian,
 224                     ppc_cpu_t dialect)
 225 {
 226   bfd_byte buffer[4];
 227   int status;
 228   unsigned long insn;
 229   const struct powerpc_opcode *opcode;
 230   const struct powerpc_opcode *opcode_end;
 231   unsigned long op;
 232
 233   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 234   if (status != 0)
 235     {
 236       (*info->memory_error_func) (status, memaddr, info);
 237       return -1;
 238     }
 239
 240   if (bigendian)
 241     insn = bfd_getb32 (buffer);
 242   else
 243     insn = bfd_getl32 (buffer);
 244
 245   /* Get the major opcode of the instruction.  */
 246   op = PPC_OP (insn);
 247
 248   /* Find the first match in the opcode table.  We could speed this up
 249      a bit by doing a binary search on the major opcode.  */
 250   opcode_end = powerpc_opcodes + powerpc_num_opcodes;
 251  again:
 252   for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
 253     {
 254       unsigned long table_op;
 255       const unsigned char *opindex;
 256       const struct powerpc_operand *operand;
 257       int invalid;
 258       int need_comma;
 259       int need_paren;
 260       int skip_optional;
 261
 262       table_op = PPC_OP (opcode->opcode);
 263       if (op < table_op)
 264         break;
 265       if (op > table_op)
 266         continue;
 267
 268       if ((insn & opcode->mask) != opcode->opcode
 269           || (opcode->flags & dialect) == 0)
 270         continue;
 271
 272       /* Make two passes over the operands.  First see if any of them
 273          have extraction functions, and, if they do, make sure the
 274          instruction is valid.  */
 275       invalid = 0;
 276       for (opindex = opcode->operands; *opindex != 0; opindex++)
 277         {
 278           operand = powerpc_operands + *opindex;
 279           if (operand->extract)
 280             (*operand->extract) (insn, dialect, &invalid);
 281         }
 282       if (invalid)
 283         continue;
 284
 285       /* The instruction is valid.  */
 286       if (opcode->operands[0] != 0)
 287         (*info->fprintf_func) (info->stream, "%-7s ", opcode->name);
 288       else
 289         (*info->fprintf_func) (info->stream, "%s", opcode->name);
 290
 291       /* Now extract and print the operands.  */
 292       need_comma = 0;
 293       need_paren = 0;
 294       skip_optional = -1;
 295       for (opindex = opcode->operands; *opindex != 0; opindex++)
 296         {
 297           long value;
 298
 299           operand = powerpc_operands + *opindex;
 300
 301           /* Operands that are marked FAKE are simply ignored.  We
 302              already made sure that the extract function considered
 303              the instruction to be valid.  */
 304           if ((operand->flags & PPC_OPERAND_FAKE) != 0)
 305             continue;
 306
 307           /* If all of the optional operands have the value zero,
 308              then don't print any of them.  */
 309           if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0)
 310             {
 311               if (skip_optional < 0)
 312                 skip_optional = skip_optional_operands (opindex, insn,
 313                                                         dialect);
 314               if (skip_optional)
 315                 continue;
 316             }
 317
 318           value = operand_value_powerpc (operand, insn, dialect);
 319
 320           if (need_comma)
 321             {
 322               (*info->fprintf_func) (info->stream, ",");
 323               need_comma = 0;
 324             }
 325
 326           /* Print the operand as directed by the flags.  */
 327           if ((operand->flags & PPC_OPERAND_GPR) != 0
 328               || ((operand->flags & PPC_OPERAND_GPR_0) != 0 && value != 0))
 329             (*info->fprintf_func) (info->stream, "r%ld", value);
 330           else if ((operand->flags & PPC_OPERAND_FPR) != 0)
 331             (*info->fprintf_func) (info->stream, "f%ld", value);
 332           else if ((operand->flags & PPC_OPERAND_VR) != 0)
 333             (*info->fprintf_func) (info->stream, "v%ld", value);
 334           else if ((operand->flags & PPC_OPERAND_VSR) != 0)
 335             (*info->fprintf_func) (info->stream, "vs%ld", value);
 336           else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
 337             (*info->print_address_func) (memaddr + value, info);
 338           else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
 339             (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
 340           else if ((operand->flags & PPC_OPERAND_CR) == 0
 341                    || (dialect & PPC_OPCODE_PPC) == 0)
 342             (*info->fprintf_func) (info->stream, "%ld", value);
 343           else if ((operand->flags & PPC_OPERAND_FSL) != 0)
 344             (*info->fprintf_func) (info->stream, "fsl%ld", value);
 345           else if ((operand->flags & PPC_OPERAND_FCR) != 0)
 346             (*info->fprintf_func) (info->stream, "fcr%ld", value);
 347           else if ((operand->flags & PPC_OPERAND_UDI) != 0)
 348             (*info->fprintf_func) (info->stream, "%ld", value);
 349           else
 350             {
 351               if (operand->bitm == 7)
 352                 (*info->fprintf_func) (info->stream, "cr%ld", value);
 353               else
 354                 {
 355                   static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
 356                   int cr;
 357                   int cc;
 358
 359                   cr = value >> 2;
 360                   if (cr != 0)
 361                     (*info->fprintf_func) (info->stream, "4*cr%d+", cr);
 362                   cc = value & 3;
 363                   (*info->fprintf_func) (info->stream, "%s", cbnames[cc]);
 364                 }
 365             }
 366
 367           if (need_paren)
 368             {
 369               (*info->fprintf_func) (info->stream, ")");
 370               need_paren = 0;
 371             }
 372
 373           if ((operand->flags & PPC_OPERAND_PARENS) == 0)
 374             need_comma = 1;
 375           else
 376             {
 377               (*info->fprintf_func) (info->stream, "(");
 378               need_paren = 1;
 379             }
 380         }
 381
 382       /* We have found and printed an instruction; return.  */
 383       return 4;
 384     }
 385
 386   if ((dialect & PPC_OPCODE_ANY) != 0)
 387     {
 388       dialect = ~PPC_OPCODE_ANY;
 389       goto again;
 390     }
 391
 392   /* We could not find a match.  */
 393   (*info->fprintf_func) (info->stream, ".long 0x%lx", insn);
 394
 395   return 4;
 396 }
 397
 398 void
 399 print_ppc_disassembler_options (FILE *stream)
 400 {
 401   fprintf (stream, "\n\
 402 The following PPC specific disassembler options are supported for use with\n\
 403 the -M switch:\n");
 404
 405   fprintf (stream, "  booke                    Disassemble the BookE instructions\n");
 406   fprintf (stream, "  e300                     Disassemble the e300 instructions\n");
 407   fprintf (stream, "  e500|e500x2              Disassemble the e500 instructions\n");
 408   fprintf (stream, "  e500mc                   Disassemble the e500mc instructions\n");
 409   fprintf (stream, "  440                      Disassemble the 440 instructions\n");
 410   fprintf (stream, "  464                      Disassemble the 464 instructions\n");
 411   fprintf (stream, "  efs                      Disassemble the EFS instructions\n");
 412   fprintf (stream, "  ppcps                    Disassemble the PowerPC paired singles instructions\n");
 413   fprintf (stream, "  power4                   Disassemble the Power4 instructions\n");
 414   fprintf (stream, "  power5                   Disassemble the Power5 instructions\n");
 415   fprintf (stream, "  power6                   Disassemble the Power6 instructions\n");
 416   fprintf (stream, "  power7                   Disassemble the Power7 instructions\n");
 417   fprintf (stream, "  vsx                      Disassemble the Vector-Scalar (VSX) instructions\n");
 418   fprintf (stream, "  32                       Do not disassemble 64-bit instructions\n");
 419   fprintf (stream, "  64                       Allow disassembly of 64-bit instructions\n");
 420 }