opcodes/ppc-dis.c

   1 /* ppc-dis.c -- Disassemble PowerPC instructions
   2    Copyright 1994, 1995, 2000, 2001, 2002 Free Software Foundation, Inc.
   3    Written by Ian Lance Taylor, Cygnus Support
   4
   5 This file is part of GDB, GAS, and the GNU binutils.
   6
   7 GDB, GAS, and the GNU binutils are free software; you can redistribute
   8 them and/or modify them under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either version
  10 2, or (at your option) any later version.
  11
  12 GDB, GAS, and the GNU binutils are distributed in the hope that they
  13 will be useful, but WITHOUT ANY WARRANTY; without even the implied
  14 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15 the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this file; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include <stdio.h>
  22 #include "sysdep.h"
  23 #include "dis-asm.h"
  24 #include "opcode/ppc.h"
  25
  26 /* This file provides several disassembler functions, all of which use
  27    the disassembler interface defined in dis-asm.h.  Several functions
  28    are provided because this file handles disassembly for the PowerPC
  29    in both big and little endian mode and also for the POWER (RS/6000)
  30    chip.  */
  31
  32 static int print_insn_powerpc PARAMS ((bfd_vma, struct disassemble_info *,
  33                                        int bigendian, int dialect));
  34
  35 static int powerpc_dialect PARAMS ((struct disassemble_info *));
  36
  37 /* Determine which set of machines to disassemble for.  PPC403/601 or
  38    BookE.  For convenience, also disassemble instructions supported
  39    by the AltiVec vector unit.  */
  40
  41 int
  42 powerpc_dialect(info)
  43      struct disassemble_info *info;
  44 {
  45   int dialect = PPC_OPCODE_PPC | PPC_OPCODE_ALTIVEC;
  46
  47   if (BFD_DEFAULT_TARGET_SIZE == 64)
  48     dialect |= PPC_OPCODE_64;
  49
  50   if (info->disassembler_options
  51       && (strcmp (info->disassembler_options, "booke") == 0
  52           || strcmp (info->disassembler_options, "booke32") == 0
  53           || strcmp (info->disassembler_options, "booke64") == 0))
  54     dialect |= PPC_OPCODE_BOOKE | PPC_OPCODE_BOOKE64;
  55   else
  56     if ((info->mach == bfd_mach_ppc_e500)
  57         || (info->disassembler_options
  58         && (   strcmp (info->disassembler_options, "e500") == 0
  59             || strcmp (info->disassembler_options, "e500x2") == 0)))
  60       {
  61         dialect |= PPC_OPCODE_BOOKE
  62           | PPC_OPCODE_SPE | PPC_OPCODE_ISEL
  63           | PPC_OPCODE_EFS | PPC_OPCODE_BRLOCK
  64           | PPC_OPCODE_PMR | PPC_OPCODE_CACHELCK
  65           | PPC_OPCODE_RFMCI;
  66         /* efs* and AltiVec conflict.  */
  67         dialect &= ~PPC_OPCODE_ALTIVEC;
  68       }
  69   else
  70     if (info->disassembler_options
  71         && (strcmp (info->disassembler_options, "efs") == 0))
  72       {
  73         dialect |= PPC_OPCODE_EFS;
  74         /* efs* and AltiVec conflict.  */
  75         dialect &= ~PPC_OPCODE_ALTIVEC;
  76       }
  77   else
  78     dialect |= PPC_OPCODE_403 | PPC_OPCODE_601 | PPC_OPCODE_COMMON;
  79
  80   if (info->disassembler_options
  81       && strcmp (info->disassembler_options, "power4") == 0)
  82     dialect |= PPC_OPCODE_POWER4;
  83
  84   if (info->disassembler_options)
  85     {
  86       if (strstr (info->disassembler_options, "32") != NULL)
  87         dialect &= ~PPC_OPCODE_64;
  88       else if (strstr (info->disassembler_options, "64") != NULL)
  89         dialect |= PPC_OPCODE_64;
  90     }
  91
  92   return dialect;
  93 }
  94
  95 /* Print a big endian PowerPC instruction.  */
  96
  97 int
  98 print_insn_big_powerpc (memaddr, info)
  99      bfd_vma memaddr;
 100      struct disassemble_info *info;
 101 {
 102   return print_insn_powerpc (memaddr, info, 1, powerpc_dialect(info));
 103 }
 104
 105 /* Print a little endian PowerPC instruction.  */
 106
 107 int
 108 print_insn_little_powerpc (memaddr, info)
 109      bfd_vma memaddr;
 110      struct disassemble_info *info;
 111 {
 112   return print_insn_powerpc (memaddr, info, 0, powerpc_dialect(info));
 113 }
 114
 115 /* Print a POWER (RS/6000) instruction.  */
 116
 117 int
 118 print_insn_rs6000 (memaddr, info)
 119      bfd_vma memaddr;
 120      struct disassemble_info *info;
 121 {
 122   return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER);
 123 }
 124
 125 /* Print a PowerPC or POWER instruction.  */
 126
 127 static int
 128 print_insn_powerpc (memaddr, info, bigendian, dialect)
 129      bfd_vma memaddr;
 130      struct disassemble_info *info;
 131      int bigendian;
 132      int dialect;
 133 {
 134   bfd_byte buffer[4];
 135   int status;
 136   unsigned long insn;
 137   const struct powerpc_opcode *opcode;
 138   const struct powerpc_opcode *opcode_end;
 139   unsigned long op;
 140
 141   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 142   if (status != 0)
 143     {
 144       (*info->memory_error_func) (status, memaddr, info);
 145       return -1;
 146     }
 147
 148   if (bigendian)
 149     insn = bfd_getb32 (buffer);
 150   else
 151     insn = bfd_getl32 (buffer);
 152
 153   /* Get the major opcode of the instruction.  */
 154   op = PPC_OP (insn);
 155
 156   /* Find the first match in the opcode table.  We could speed this up
 157      a bit by doing a binary search on the major opcode.  */
 158   opcode_end = powerpc_opcodes + powerpc_num_opcodes;
 159   for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
 160     {
 161       unsigned long table_op;
 162       const unsigned char *opindex;
 163       const struct powerpc_operand *operand;
 164       int invalid;
 165       int need_comma;
 166       int need_paren;
 167
 168       table_op = PPC_OP (opcode->opcode);
 169       if (op < table_op)
 170         break;
 171       if (op > table_op)
 172         continue;
 173
 174       if ((insn & opcode->mask) != opcode->opcode
 175           || (opcode->flags & dialect) == 0)
 176         continue;
 177
 178       if ((dialect & PPC_OPCODE_EFS) && (opcode->flags & PPC_OPCODE_ALTIVEC))
 179         continue;
 180
 181       /* Make two passes over the operands.  First see if any of them
 182          have extraction functions, and, if they do, make sure the
 183          instruction is valid.  */
 184       invalid = 0;
 185       for (opindex = opcode->operands; *opindex != 0; opindex++)
 186         {
 187           operand = powerpc_operands + *opindex;
 188           if (operand->extract)
 189             (*operand->extract) (insn, dialect, &invalid);
 190         }
 191       if (invalid)
 192         continue;
 193
 194       /* The instruction is valid.  */
 195       (*info->fprintf_func) (info->stream, "%s", opcode->name);
 196       if (opcode->operands[0] != 0)
 197         (*info->fprintf_func) (info->stream, "\t");
 198
 199       /* Now extract and print the operands.  */
 200       need_comma = 0;
 201       need_paren = 0;
 202       for (opindex = opcode->operands; *opindex != 0; opindex++)
 203         {
 204           long value;
 205
 206           operand = powerpc_operands + *opindex;
 207
 208           /* Operands that are marked FAKE are simply ignored.  We
 209              already made sure that the extract function considered
 210              the instruction to be valid.  */
 211           if ((operand->flags & PPC_OPERAND_FAKE) != 0)
 212             continue;
 213
 214           /* Extract the value from the instruction.  */
 215           if (operand->extract)
 216             value = (*operand->extract) (insn, dialect, (int *) NULL);
 217           else
 218             {
 219               value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
 220               if ((operand->flags & PPC_OPERAND_SIGNED) != 0
 221                   && (value & (1 << (operand->bits - 1))) != 0)
 222                 value -= 1 << operand->bits;
 223             }
 224
 225           /* If the operand is optional, and the value is zero, don't
 226              print anything.  */
 227           if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
 228               && (operand->flags & PPC_OPERAND_NEXT) == 0
 229               && value == 0)
 230             continue;
 231
 232           if (need_comma)
 233             {
 234               (*info->fprintf_func) (info->stream, ",");
 235               need_comma = 0;
 236             }
 237
 238           /* Print the operand as directed by the flags.  */
 239           if ((operand->flags & PPC_OPERAND_GPR) != 0)
 240             (*info->fprintf_func) (info->stream, "r%ld", value);
 241           else if ((operand->flags & PPC_OPERAND_FPR) != 0)
 242             (*info->fprintf_func) (info->stream, "f%ld", value);
 243           else if ((operand->flags & PPC_OPERAND_VR) != 0)
 244             (*info->fprintf_func) (info->stream, "v%ld", value);
 245           else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
 246             (*info->print_address_func) (memaddr + value, info);
 247           else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
 248             (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
 249           else if ((operand->flags & PPC_OPERAND_CR) == 0
 250                    || (dialect & PPC_OPCODE_PPC) == 0)
 251             (*info->fprintf_func) (info->stream, "%ld", value);
 252           else
 253             {
 254               if (operand->bits == 3)
 255                 (*info->fprintf_func) (info->stream, "cr%d", value);
 256               else
 257                 {
 258                   static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
 259                   int cr;
 260                   int cc;
 261
 262                   cr = value >> 2;
 263                   if (cr != 0)
 264                     (*info->fprintf_func) (info->stream, "4*cr%d", cr);
 265                   cc = value & 3;
 266                   if (cc != 0)
 267                     {
 268                       if (cr != 0)
 269                         (*info->fprintf_func) (info->stream, "+");
 270                       (*info->fprintf_func) (info->stream, "%s", cbnames[cc]);
 271                     }
 272                 }
 273             }
 274
 275           if (need_paren)
 276             {
 277               (*info->fprintf_func) (info->stream, ")");
 278               need_paren = 0;
 279             }
 280
 281           if ((operand->flags & PPC_OPERAND_PARENS) == 0)
 282             need_comma = 1;
 283           else
 284             {
 285               (*info->fprintf_func) (info->stream, "(");
 286               need_paren = 1;
 287             }
 288         }
 289
 290       /* We have found and printed an instruction; return.  */
 291       return 4;
 292     }
 293
 294   /* We could not find a match.  */
 295   (*info->fprintf_func) (info->stream, ".long 0x%lx", insn);
 296
 297   return 4;
 298 }