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