1 /* ppc-dis.c -- Disassemble PowerPC instructions 2 Copyright 1994, 1995, 2000, 2001, 2002, 2003, 2004, 2005 3 Free Software Foundation, Inc. 4 Written by Ian Lance Taylor, Cygnus Support 5 6 This file is part of GDB, GAS, and the GNU binutils. 7 8 GDB, GAS, and the GNU binutils are free software; you can redistribute 9 them and/or modify them under the terms of the GNU General Public 10 License as published by the Free Software Foundation; either version 11 2, or (at your option) any later version. 12 13 GDB, GAS, and the GNU binutils are distributed in the hope that they 14 will be useful, but WITHOUT ANY WARRANTY; without even the implied 15 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 16 the GNU General Public 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 Free 20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 21 22 #include <stdio.h> 23 #include "sysdep.h" 24 #include "dis-asm.h" 25 #include "opcode/ppc.h" 26 27 /* This file provides several disassembler functions, all of which use 28 the disassembler interface defined in dis-asm.h. Several functions 29 are provided because this file handles disassembly for the PowerPC 30 in both big and little endian mode and also for the POWER (RS/6000) 31 chip. */ 32 33 static int print_insn_powerpc (bfd_vma, struct disassemble_info *, int, int); 34 35 /* Determine which set of machines to disassemble for. PPC403/601 or 36 BookE. For convenience, also disassemble instructions supported 37 by the AltiVec vector unit. */ 38 39 static int 40 powerpc_dialect (struct disassemble_info *info) 41 { 42 int dialect = PPC_OPCODE_PPC; 43 44 if (BFD_DEFAULT_TARGET_SIZE == 64) 45 dialect |= PPC_OPCODE_64; 46 47 if (info->disassembler_options 48 && strstr (info->disassembler_options, "booke") != NULL) 49 dialect |= PPC_OPCODE_BOOKE | PPC_OPCODE_BOOKE64; 50 else if ((info->mach == bfd_mach_ppc_e500) 51 || (info->disassembler_options 52 && strstr (info->disassembler_options, "e500") != NULL)) 53 dialect |= (PPC_OPCODE_BOOKE 54 | PPC_OPCODE_SPE | PPC_OPCODE_ISEL 55 | PPC_OPCODE_EFS | PPC_OPCODE_BRLOCK 56 | PPC_OPCODE_PMR | PPC_OPCODE_CACHELCK 57 | PPC_OPCODE_RFMCI); 58 else if (info->disassembler_options 59 && strstr (info->disassembler_options, "efs") != NULL) 60 dialect |= PPC_OPCODE_EFS; 61 else if (info->disassembler_options 62 && strstr (info->disassembler_options, "e300") != NULL) 63 dialect |= PPC_OPCODE_E300 | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON; 64 else 65 dialect |= (PPC_OPCODE_403 | PPC_OPCODE_601 | PPC_OPCODE_CLASSIC 66 | PPC_OPCODE_COMMON | PPC_OPCODE_ALTIVEC); 67 68 if (info->disassembler_options 69 && strstr (info->disassembler_options, "power4") != NULL) 70 dialect |= PPC_OPCODE_POWER4; 71 72 if (info->disassembler_options 73 && strstr (info->disassembler_options, "power5") != NULL) 74 dialect |= PPC_OPCODE_POWER4 | PPC_OPCODE_POWER5; 75 76 if (info->disassembler_options 77 && strstr (info->disassembler_options, "any") != NULL) 78 dialect |= PPC_OPCODE_ANY; 79 80 if (info->disassembler_options) 81 { 82 if (strstr (info->disassembler_options, "32") != NULL) 83 dialect &= ~PPC_OPCODE_64; 84 else if (strstr (info->disassembler_options, "64") != NULL) 85 dialect |= PPC_OPCODE_64; 86 } 87 88 info->private_data = (void *)(long) dialect; 89 return dialect; 90 } 91 92 /* Print a big endian PowerPC instruction. */ 93 94 int 95 print_insn_big_powerpc (bfd_vma memaddr, struct disassemble_info *info) 96 { 97 int dialect = (long) info->private_data; 98 return print_insn_powerpc (memaddr, info, 1, dialect); 99 } 100 101 /* Print a little endian PowerPC instruction. */ 102 103 int 104 print_insn_little_powerpc (bfd_vma memaddr, struct disassemble_info *info) 105 { 106 int dialect = (long) info->private_data; 107 return print_insn_powerpc (memaddr, info, 0, dialect); 108 } 109 110 /* Print a POWER (RS/6000) instruction. */ 111 112 int 113 print_insn_rs6000 (bfd_vma memaddr, struct disassemble_info *info) 114 { 115 return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER); 116 } 117 118 /* Print a PowerPC or POWER instruction. */ 119 120 static int 121 print_insn_powerpc (bfd_vma memaddr, 122 struct disassemble_info *info, 123 int bigendian, 124 int dialect) 125 { 126 bfd_byte buffer[4]; 127 int status; 128 unsigned long insn; 129 const struct powerpc_opcode *opcode; 130 const struct powerpc_opcode *opcode_end; 131 unsigned long op; 132 133 if (dialect == 0) 134 dialect = powerpc_dialect (info); 135 136 status = (*info->read_memory_func) (memaddr, buffer, 4, info); 137 if (status != 0) 138 { 139 (*info->memory_error_func) (status, memaddr, info); 140 return -1; 141 } 142 143 if (bigendian) 144 insn = bfd_getb32 (buffer); 145 else 146 insn = bfd_getl32 (buffer); 147 148 /* Get the major opcode of the instruction. */ 149 op = PPC_OP (insn); 150 151 /* Find the first match in the opcode table. We could speed this up 152 a bit by doing a binary search on the major opcode. */ 153 opcode_end = powerpc_opcodes + powerpc_num_opcodes; 154 again: 155 for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++) 156 { 157 unsigned long table_op; 158 const unsigned char *opindex; 159 const struct powerpc_operand *operand; 160 int invalid; 161 int need_comma; 162 int need_paren; 163 164 table_op = PPC_OP (opcode->opcode); 165 if (op < table_op) 166 break; 167 if (op > table_op) 168 continue; 169 170 if ((insn & opcode->mask) != opcode->opcode 171 || (opcode->flags & dialect) == 0) 172 continue; 173 174 /* Make two passes over the operands. First see if any of them 175 have extraction functions, and, if they do, make sure the 176 instruction is valid. */ 177 invalid = 0; 178 for (opindex = opcode->operands; *opindex != 0; opindex++) 179 { 180 operand = powerpc_operands + *opindex; 181 if (operand->extract) 182 (*operand->extract) (insn, dialect, &invalid); 183 } 184 if (invalid) 185 continue; 186 187 /* The instruction is valid. */ 188 if (opcode->operands[0] != 0) 189 (*info->fprintf_func) (info->stream, "%-7s ", opcode->name); 190 else 191 (*info->fprintf_func) (info->stream, "%s", opcode->name); 192 193 /* Now extract and print the operands. */ 194 need_comma = 0; 195 need_paren = 0; 196 for (opindex = opcode->operands; *opindex != 0; opindex++) 197 { 198 long value; 199 200 operand = powerpc_operands + *opindex; 201 202 /* Operands that are marked FAKE are simply ignored. We 203 already made sure that the extract function considered 204 the instruction to be valid. */ 205 if ((operand->flags & PPC_OPERAND_FAKE) != 0) 206 continue; 207 208 /* Extract the value from the instruction. */ 209 if (operand->extract) 210 value = (*operand->extract) (insn, dialect, &invalid); 211 else 212 { 213 value = (insn >> operand->shift) & ((1 << operand->bits) - 1); 214 if ((operand->flags & PPC_OPERAND_SIGNED) != 0 215 && (value & (1 << (operand->bits - 1))) != 0) 216 value -= 1 << operand->bits; 217 } 218 219 /* If the operand is optional, and the value is zero, don't 220 print anything. */ 221 if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0 222 && (operand->flags & PPC_OPERAND_NEXT) == 0 223 && value == 0) 224 continue; 225 226 if (need_comma) 227 { 228 (*info->fprintf_func) (info->stream, ","); 229 need_comma = 0; 230 } 231 232 /* Print the operand as directed by the flags. */ 233 if ((operand->flags & PPC_OPERAND_GPR) != 0 234 || ((operand->flags & PPC_OPERAND_GPR_0) != 0 && value != 0)) 235 (*info->fprintf_func) (info->stream, "r%ld", value); 236 else if ((operand->flags & PPC_OPERAND_FPR) != 0) 237 (*info->fprintf_func) (info->stream, "f%ld", value); 238 else if ((operand->flags & PPC_OPERAND_VR) != 0) 239 (*info->fprintf_func) (info->stream, "v%ld", value); 240 else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0) 241 (*info->print_address_func) (memaddr + value, info); 242 else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0) 243 (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info); 244 else if ((operand->flags & PPC_OPERAND_CR) == 0 245 || (dialect & PPC_OPCODE_PPC) == 0) 246 (*info->fprintf_func) (info->stream, "%ld", value); 247 else 248 { 249 if (operand->bits == 3) 250 (*info->fprintf_func) (info->stream, "cr%ld", value); 251 else 252 { 253 static const char *cbnames[4] = { "lt", "gt", "eq", "so" }; 254 int cr; 255 int cc; 256 257 cr = value >> 2; 258 if (cr != 0) 259 (*info->fprintf_func) (info->stream, "4*cr%d+", cr); 260 cc = value & 3; 261 (*info->fprintf_func) (info->stream, "%s", cbnames[cc]); 262 } 263 } 264 265 if (need_paren) 266 { 267 (*info->fprintf_func) (info->stream, ")"); 268 need_paren = 0; 269 } 270 271 if ((operand->flags & PPC_OPERAND_PARENS) == 0) 272 need_comma = 1; 273 else 274 { 275 (*info->fprintf_func) (info->stream, "("); 276 need_paren = 1; 277 } 278 } 279 280 /* We have found and printed an instruction; return. */ 281 return 4; 282 } 283 284 if ((dialect & PPC_OPCODE_ANY) != 0) 285 { 286 dialect = ~PPC_OPCODE_ANY; 287 goto again; 288 } 289 290 /* We could not find a match. */ 291 (*info->fprintf_func) (info->stream, ".long 0x%lx", insn); 292 293 return 4; 294 } 295 296 void 297 print_ppc_disassembler_options (FILE *stream) 298 { 299 fprintf (stream, "\n\ 300 The following PPC specific disassembler options are supported for use with\n\ 301 the -M switch:\n"); 302 303 fprintf (stream, " booke|booke32|booke64 Disassemble the BookE instructions\n"); 304 fprintf (stream, " e300 Disassemble the e300 instructions\n"); 305 fprintf (stream, " e500|e500x2 Disassemble the e500 instructions\n"); 306 fprintf (stream, " efs Disassemble the EFS instructions\n"); 307 fprintf (stream, " power4 Disassemble the Power4 instructions\n"); 308 fprintf (stream, " power5 Disassemble the Power5 instructions\n"); 309 fprintf (stream, " 32 Do not disassemble 64-bit instructions\n"); 310 fprintf (stream, " 64 Allow disassembly of 64-bit instructions\n"); 311 } 312