opcodes/ppc-dis.c

   1 /* ppc-dis.c -- Disassemble PowerPC instructions
   2    Copyright 1994, 1995, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   3    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
  34 static int print_insn_powerpc (bfd_vma, struct disassemble_info *, int, int);
  35
  36 /* Determine which set of machines to disassemble for.  PPC403/601 or
  37    BookE.  For convenience, also disassemble instructions supported
  38    by the AltiVec vector unit.  */
  39
  40 static int
  41 powerpc_dialect (struct disassemble_info *info)
  42 {
  43   int dialect = PPC_OPCODE_PPC;
  44
  45   if (BFD_DEFAULT_TARGET_SIZE == 64)
  46     dialect |= PPC_OPCODE_64;
  47
  48   if (info->disassembler_options
  49       && strstr (info->disassembler_options, "ppcps") != NULL)
  50     dialect |= PPC_OPCODE_PPCPS;
  51   else if (info->disassembler_options
  52       && strstr (info->disassembler_options, "booke") != NULL)
  53     dialect |= PPC_OPCODE_BOOKE | PPC_OPCODE_BOOKE64;
  54   else if ((info->mach == bfd_mach_ppc_e500)
  55            || (info->disassembler_options
  56                && strstr (info->disassembler_options, "e500") != NULL))
  57     dialect |= (PPC_OPCODE_BOOKE
  58                 | PPC_OPCODE_SPE | PPC_OPCODE_ISEL
  59                 | PPC_OPCODE_EFS | PPC_OPCODE_BRLOCK
  60                 | PPC_OPCODE_PMR | PPC_OPCODE_CACHELCK
  61                 | PPC_OPCODE_RFMCI);
  62   else if (info->disassembler_options
  63            && strstr (info->disassembler_options, "efs") != NULL)
  64     dialect |= PPC_OPCODE_EFS;
  65   else if (info->disassembler_options
  66            && strstr (info->disassembler_options, "e300") != NULL)
  67     dialect |= PPC_OPCODE_E300 | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON;
  68   else if (info->disassembler_options
  69            && strstr (info->disassembler_options, "440") != NULL)
  70     dialect |= PPC_OPCODE_BOOKE | PPC_OPCODE_32
  71       | PPC_OPCODE_440 | PPC_OPCODE_ISEL | PPC_OPCODE_RFMCI;
  72   else
  73     dialect |= (PPC_OPCODE_403 | PPC_OPCODE_601 | PPC_OPCODE_CLASSIC
  74                 | PPC_OPCODE_COMMON | PPC_OPCODE_ALTIVEC);
  75
  76   if (info->disassembler_options
  77       && strstr (info->disassembler_options, "power4") != NULL)
  78     dialect |= PPC_OPCODE_POWER4;
  79
  80   if (info->disassembler_options
  81       && strstr (info->disassembler_options, "power5") != NULL)
  82     dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_POWER5;
  83
  84   if (info->disassembler_options
  85       && strstr (info->disassembler_options, "cell") != NULL)
  86     dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_CELL | PPC_OPCODE_ALTIVEC;
  87
  88   if (info->disassembler_options
  89       && strstr (info->disassembler_options, "power6") != NULL)
  90     dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_ALTIVEC;
  91
  92   if (info->disassembler_options
  93       && strstr (info->disassembler_options, "any") != NULL)
  94     dialect |= PPC_OPCODE_ANY;
  95
  96   if (info->disassembler_options)
  97     {
  98       if (strstr (info->disassembler_options, "32") != NULL)
  99         dialect &= ~PPC_OPCODE_64;
 100       else if (strstr (info->disassembler_options, "64") != NULL)
 101         dialect |= PPC_OPCODE_64;
 102     }
 103
 104   info->private_data = (char *) 0 + dialect;
 105   return dialect;
 106 }
 107
 108 /* Print a big endian PowerPC instruction.  */
 109
 110 int
 111 print_insn_big_powerpc (bfd_vma memaddr, struct disassemble_info *info)
 112 {
 113   int dialect = (char *) info->private_data - (char *) 0;
 114   return print_insn_powerpc (memaddr, info, 1, dialect);
 115 }
 116
 117 /* Print a little endian PowerPC instruction.  */
 118
 119 int
 120 print_insn_little_powerpc (bfd_vma memaddr, struct disassemble_info *info)
 121 {
 122   int dialect = (char *) info->private_data - (char *) 0;
 123   return print_insn_powerpc (memaddr, info, 0, dialect);
 124 }
 125
 126 /* Print a POWER (RS/6000) instruction.  */
 127
 128 int
 129 print_insn_rs6000 (bfd_vma memaddr, struct disassemble_info *info)
 130 {
 131   return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER);
 132 }
 133
 134 /* Extract the operand value from the PowerPC or POWER instruction.  */
 135
 136 static long
 137 operand_value_powerpc (const struct powerpc_operand *operand,
 138                        unsigned long insn, int dialect)
 139 {
 140   long value;
 141   int invalid;
 142   /* Extract the value from the instruction.  */
 143   if (operand->extract)
 144     value = (*operand->extract) (insn, dialect, &invalid);
 145   else
 146     {
 147       value = (insn >> operand->shift) & operand->bitm;
 148       if ((operand->flags & PPC_OPERAND_SIGNED) != 0)
 149         {
 150           /* BITM is always some number of zeros followed by some
 151              number of ones, followed by some numer of zeros.  */
 152           unsigned long top = operand->bitm;
 153           /* top & -top gives the rightmost 1 bit, so this
 154              fills in any trailing zeros.  */
 155           top |= (top & -top) - 1;
 156           top &= ~(top >> 1);
 157           value = (value ^ top) - top;
 158         }
 159     }
 160
 161   return value;
 162 }
 163
 164 /* Determine whether the optional operand(s) should be printed.  */
 165
 166 static int
 167 skip_optional_operands (const unsigned char *opindex,
 168                         unsigned long insn, int dialect)
 169 {
 170   const struct powerpc_operand *operand;
 171
 172   for (; *opindex != 0; opindex++)
 173     {
 174       operand = &powerpc_operands[*opindex];
 175       if ((operand->flags & PPC_OPERAND_NEXT) != 0
 176           || ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
 177               && operand_value_powerpc (operand, insn, dialect) != 0))
 178         return 0;
 179     }
 180
 181   return 1;
 182 }
 183
 184 /* Print a PowerPC or POWER instruction.  */
 185
 186 static int
 187 print_insn_powerpc (bfd_vma memaddr,
 188                     struct disassemble_info *info,
 189                     int bigendian,
 190                     int dialect)
 191 {
 192   bfd_byte buffer[4];
 193   int status;
 194   unsigned long insn;
 195   const struct powerpc_opcode *opcode;
 196   const struct powerpc_opcode *opcode_end;
 197   unsigned long op;
 198
 199   if (dialect == 0)
 200     dialect = powerpc_dialect (info);
 201
 202   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 203   if (status != 0)
 204     {
 205       (*info->memory_error_func) (status, memaddr, info);
 206       return -1;
 207     }
 208
 209   if (bigendian)
 210     insn = bfd_getb32 (buffer);
 211   else
 212     insn = bfd_getl32 (buffer);
 213
 214   /* Get the major opcode of the instruction.  */
 215   op = PPC_OP (insn);
 216
 217   /* Find the first match in the opcode table.  We could speed this up
 218      a bit by doing a binary search on the major opcode.  */
 219   opcode_end = powerpc_opcodes + powerpc_num_opcodes;
 220  again:
 221   for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
 222     {
 223       unsigned long table_op;
 224       const unsigned char *opindex;
 225       const struct powerpc_operand *operand;
 226       int invalid;
 227       int need_comma;
 228       int need_paren;
 229       int skip_optional;
 230
 231       table_op = PPC_OP (opcode->opcode);
 232       if (op < table_op)
 233         break;
 234       if (op > table_op)
 235         continue;
 236
 237       if ((insn & opcode->mask) != opcode->opcode
 238           || (opcode->flags & dialect) == 0)
 239         continue;
 240
 241       /* Make two passes over the operands.  First see if any of them
 242          have extraction functions, and, if they do, make sure the
 243          instruction is valid.  */
 244       invalid = 0;
 245       for (opindex = opcode->operands; *opindex != 0; opindex++)
 246         {
 247           operand = powerpc_operands + *opindex;
 248           if (operand->extract)
 249             (*operand->extract) (insn, dialect, &invalid);
 250         }
 251       if (invalid)
 252         continue;
 253
 254       /* The instruction is valid.  */
 255       if (opcode->operands[0] != 0)
 256         (*info->fprintf_func) (info->stream, "%-7s ", opcode->name);
 257       else
 258         (*info->fprintf_func) (info->stream, "%s", opcode->name);
 259
 260       /* Now extract and print the operands.  */
 261       need_comma = 0;
 262       need_paren = 0;
 263       skip_optional = -1;
 264       for (opindex = opcode->operands; *opindex != 0; opindex++)
 265         {
 266           long value;
 267
 268           operand = powerpc_operands + *opindex;
 269
 270           /* Operands that are marked FAKE are simply ignored.  We
 271              already made sure that the extract function considered
 272              the instruction to be valid.  */
 273           if ((operand->flags & PPC_OPERAND_FAKE) != 0)
 274             continue;
 275
 276           /* If all of the optional operands have the value zero,
 277              then don't print any of them.  */
 278           if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0)
 279             {
 280               if (skip_optional < 0)
 281                 skip_optional = skip_optional_operands (opindex, insn,
 282                                                         dialect);
 283               if (skip_optional)
 284                 continue;
 285             }
 286
 287           value = operand_value_powerpc (operand, insn, dialect);
 288
 289           if (need_comma)
 290             {
 291               (*info->fprintf_func) (info->stream, ",");
 292               need_comma = 0;
 293             }
 294
 295           /* Print the operand as directed by the flags.  */
 296           if ((operand->flags & PPC_OPERAND_GPR) != 0
 297               || ((operand->flags & PPC_OPERAND_GPR_0) != 0 && value != 0))
 298             (*info->fprintf_func) (info->stream, "r%ld", value);
 299           else if ((operand->flags & PPC_OPERAND_FPR) != 0)
 300             (*info->fprintf_func) (info->stream, "f%ld", value);
 301           else if ((operand->flags & PPC_OPERAND_VR) != 0)
 302             (*info->fprintf_func) (info->stream, "v%ld", value);
 303           else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
 304             (*info->print_address_func) (memaddr + value, info);
 305           else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
 306             (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
 307           else if ((operand->flags & PPC_OPERAND_CR) == 0
 308                    || (dialect & PPC_OPCODE_PPC) == 0)
 309             (*info->fprintf_func) (info->stream, "%ld", value);
 310           else
 311             {
 312               if (operand->bitm == 7)
 313                 (*info->fprintf_func) (info->stream, "cr%ld", value);
 314               else
 315                 {
 316                   static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
 317                   int cr;
 318                   int cc;
 319
 320                   cr = value >> 2;
 321                   if (cr != 0)
 322                     (*info->fprintf_func) (info->stream, "4*cr%d+", cr);
 323                   cc = value & 3;
 324                   (*info->fprintf_func) (info->stream, "%s", cbnames[cc]);
 325                 }
 326             }
 327
 328           if (need_paren)
 329             {
 330               (*info->fprintf_func) (info->stream, ")");
 331               need_paren = 0;
 332             }
 333
 334           if ((operand->flags & PPC_OPERAND_PARENS) == 0)
 335             need_comma = 1;
 336           else
 337             {
 338               (*info->fprintf_func) (info->stream, "(");
 339               need_paren = 1;
 340             }
 341         }
 342
 343       /* We have found and printed an instruction; return.  */
 344       return 4;
 345     }
 346
 347   if ((dialect & PPC_OPCODE_ANY) != 0)
 348     {
 349       dialect = ~PPC_OPCODE_ANY;
 350       goto again;
 351     }
 352
 353   /* We could not find a match.  */
 354   (*info->fprintf_func) (info->stream, ".long 0x%lx", insn);
 355
 356   return 4;
 357 }
 358
 359 void
 360 print_ppc_disassembler_options (FILE *stream)
 361 {
 362   fprintf (stream, "\n\
 363 The following PPC specific disassembler options are supported for use with\n\
 364 the -M switch:\n");
 365
 366   fprintf (stream, "  booke|booke32|booke64    Disassemble the BookE instructions\n");
 367   fprintf (stream, "  e300                     Disassemble the e300 instructions\n");
 368   fprintf (stream, "  e500|e500x2              Disassemble the e500 instructions\n");
 369   fprintf (stream, "  440                      Disassemble the 440 instructions\n");
 370   fprintf (stream, "  efs                      Disassemble the EFS instructions\n");
 371   fprintf (stream, "  ppcps                    Disassemble the PowerPC paired singles instructions\n");
 372   fprintf (stream, "  power4                   Disassemble the Power4 instructions\n");
 373   fprintf (stream, "  power5                   Disassemble the Power5 instructions\n");
 374   fprintf (stream, "  power6                   Disassemble the Power6 instructions\n");
 375   fprintf (stream, "  32                       Do not disassemble 64-bit instructions\n");
 376   fprintf (stream, "  64                       Allow disassembly of 64-bit instructions\n");
 377 }