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_CLASSIC
  79                 | PPC_OPCODE_COMMON);
  80
  81   if (info->disassembler_options
  82       && strcmp (info->disassembler_options, "power4") == 0)
  83     dialect |= PPC_OPCODE_POWER4;
  84
  85   if (info->disassembler_options)
  86     {
  87       if (strstr (info->disassembler_options, "32") != NULL)
  88         dialect &= ~PPC_OPCODE_64;
  89       else if (strstr (info->disassembler_options, "64") != NULL)
  90         dialect |= PPC_OPCODE_64;
  91     }
  92
  93   return dialect;
  94 }
  95
  96 /* Print a big endian PowerPC instruction.  */
  97
  98 int
  99 print_insn_big_powerpc (memaddr, info)
 100      bfd_vma memaddr;
 101      struct disassemble_info *info;
 102 {
 103   return print_insn_powerpc (memaddr, info, 1, powerpc_dialect(info));
 104 }
 105
 106 /* Print a little endian PowerPC instruction.  */
 107
 108 int
 109 print_insn_little_powerpc (memaddr, info)
 110      bfd_vma memaddr;
 111      struct disassemble_info *info;
 112 {
 113   return print_insn_powerpc (memaddr, info, 0, powerpc_dialect(info));
 114 }
 115
 116 /* Print a POWER (RS/6000) instruction.  */
 117
 118 int
 119 print_insn_rs6000 (memaddr, info)
 120      bfd_vma memaddr;
 121      struct disassemble_info *info;
 122 {
 123   return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER);
 124 }
 125
 126 /* Print a PowerPC or POWER instruction.  */
 127
 128 static int
 129 print_insn_powerpc (memaddr, info, bigendian, dialect)
 130      bfd_vma memaddr;
 131      struct disassemble_info *info;
 132      int bigendian;
 133      int dialect;
 134 {
 135   bfd_byte buffer[4];
 136   int status;
 137   unsigned long insn;
 138   const struct powerpc_opcode *opcode;
 139   const struct powerpc_opcode *opcode_end;
 140   unsigned long op;
 141
 142   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 143   if (status != 0)
 144     {
 145       (*info->memory_error_func) (status, memaddr, info);
 146       return -1;
 147     }
 148
 149   if (bigendian)
 150     insn = bfd_getb32 (buffer);
 151   else
 152     insn = bfd_getl32 (buffer);
 153
 154   /* Get the major opcode of the instruction.  */
 155   op = PPC_OP (insn);
 156
 157   /* Find the first match in the opcode table.  We could speed this up
 158      a bit by doing a binary search on the major opcode.  */
 159   opcode_end = powerpc_opcodes + powerpc_num_opcodes;
 160   for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
 161     {
 162       unsigned long table_op;
 163       const unsigned char *opindex;
 164       const struct powerpc_operand *operand;
 165       int invalid;
 166       int need_comma;
 167       int need_paren;
 168
 169       table_op = PPC_OP (opcode->opcode);
 170       if (op < table_op)
 171         break;
 172       if (op > table_op)
 173         continue;
 174
 175       if ((insn & opcode->mask) != opcode->opcode
 176           || (opcode->flags & dialect) == 0)
 177         continue;
 178
 179       if ((dialect & PPC_OPCODE_EFS) && (opcode->flags & PPC_OPCODE_ALTIVEC))
 180         continue;
 181
 182       /* Make two passes over the operands.  First see if any of them
 183          have extraction functions, and, if they do, make sure the
 184          instruction is valid.  */
 185       invalid = 0;
 186       for (opindex = opcode->operands; *opindex != 0; opindex++)
 187         {
 188           operand = powerpc_operands + *opindex;
 189           if (operand->extract)
 190             (*operand->extract) (insn, dialect, &invalid);
 191         }
 192       if (invalid)
 193         continue;
 194
 195       /* The instruction is valid.  */
 196       (*info->fprintf_func) (info->stream, "%s", opcode->name);
 197       if (opcode->operands[0] != 0)
 198         (*info->fprintf_func) (info->stream, "\t");
 199
 200       /* Now extract and print the operands.  */
 201       need_comma = 0;
 202       need_paren = 0;
 203       for (opindex = opcode->operands; *opindex != 0; opindex++)
 204         {
 205           long value;
 206
 207           operand = powerpc_operands + *opindex;
 208
 209           /* Operands that are marked FAKE are simply ignored.  We
 210              already made sure that the extract function considered
 211              the instruction to be valid.  */
 212           if ((operand->flags & PPC_OPERAND_FAKE) != 0)
 213             continue;
 214
 215           /* Extract the value from the instruction.  */
 216           if (operand->extract)
 217             value = (*operand->extract) (insn, dialect, (int *) NULL);
 218           else
 219             {
 220               value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
 221               if ((operand->flags & PPC_OPERAND_SIGNED) != 0
 222                   && (value & (1 << (operand->bits - 1))) != 0)
 223                 value -= 1 << operand->bits;
 224             }
 225
 226           /* If the operand is optional, and the value is zero, don't
 227              print anything.  */
 228           if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
 229               && (operand->flags & PPC_OPERAND_NEXT) == 0
 230               && value == 0)
 231             continue;
 232
 233           if (need_comma)
 234             {
 235               (*info->fprintf_func) (info->stream, ",");
 236               need_comma = 0;
 237             }
 238
 239           /* Print the operand as directed by the flags.  */
 240           if ((operand->flags & PPC_OPERAND_GPR) != 0)
 241             (*info->fprintf_func) (info->stream, "r%ld", value);
 242           else if ((operand->flags & PPC_OPERAND_FPR) != 0)
 243             (*info->fprintf_func) (info->stream, "f%ld", value);
 244           else if ((operand->flags & PPC_OPERAND_VR) != 0)
 245             (*info->fprintf_func) (info->stream, "v%ld", value);
 246           else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
 247             (*info->print_address_func) (memaddr + value, info);
 248           else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
 249             (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
 250           else if ((operand->flags & PPC_OPERAND_CR) == 0
 251                    || (dialect & PPC_OPCODE_PPC) == 0)
 252             (*info->fprintf_func) (info->stream, "%ld", value);
 253           else
 254             {
 255               if (operand->bits == 3)
 256                 (*info->fprintf_func) (info->stream, "cr%d", value);
 257               else
 258                 {
 259                   static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
 260                   int cr;
 261                   int cc;
 262
 263                   cr = value >> 2;
 264                   if (cr != 0)
 265                     (*info->fprintf_func) (info->stream, "4*cr%d", cr);
 266                   cc = value & 3;
 267                   if (cc != 0)
 268                     {
 269                       if (cr != 0)
 270                         (*info->fprintf_func) (info->stream, "+");
 271                       (*info->fprintf_func) (info->stream, "%s", cbnames[cc]);
 272                     }
 273                 }
 274             }
 275
 276           if (need_paren)
 277             {
 278               (*info->fprintf_func) (info->stream, ")");
 279               need_paren = 0;
 280             }
 281
 282           if ((operand->flags & PPC_OPERAND_PARENS) == 0)
 283             need_comma = 1;
 284           else
 285             {
 286               (*info->fprintf_func) (info->stream, "(");
 287               need_paren = 1;
 288             }
 289         }
 290
 291       /* We have found and printed an instruction; return.  */
 292       return 4;
 293     }
 294
 295   /* We could not find a match.  */
 296   (*info->fprintf_func) (info->stream, ".long 0x%lx", insn);
 297
 298   return 4;
 299 }
 300
 301 void
 302 print_ppc_disassembler_options (FILE * stream)
 303 {
 304   fprintf (stream, "\n\
 305 The following PPC specific disassembler options are supported for use with\n\
 306 the -M switch:\n");
 307
 308   fprintf (stream, "  booke|booke32|booke64    Disassemble the BookE instructions\n");
 309   fprintf (stream, "  e500|e500x2              Disassemble the e500 instructions\n");
 310   fprintf (stream, "  efs                      Disassemble the EFS instructions\n");
 311   fprintf (stream, "  power4                   Disassemble the Power4 instructions\n");
 312   fprintf (stream, "  32                       Do not disassemble 64-bit instructions\n");
 313   fprintf (stream, "  64                       Allow disassembly of 64-bit instructions\n");
 314 }