| 1 | /* Instruction printing code for the AMD 29000 |
| 2 | Copyright (C) 1990, 93, 94, 95, 1998 Free Software Foundation, Inc. |
| 3 | Contributed by Cygnus Support. Written by Jim Kingdon. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | 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 program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "dis-asm.h" |
| 22 | #include "opcode/a29k.h" |
| 23 | |
| 24 | /* Print a symbolic representation of a general-purpose |
| 25 | register number NUM on STREAM. |
| 26 | NUM is a number as found in the instruction, not as found in |
| 27 | debugging symbols; it must be in the range 0-255. */ |
| 28 | static void |
| 29 | print_general (num, info) |
| 30 | int num; |
| 31 | struct disassemble_info *info; |
| 32 | { |
| 33 | if (num < 128) |
| 34 | (*info->fprintf_func) (info->stream, "gr%d", num); |
| 35 | else |
| 36 | (*info->fprintf_func) (info->stream, "lr%d", num - 128); |
| 37 | } |
| 38 | |
| 39 | /* Like print_general but a special-purpose register. |
| 40 | |
| 41 | The mnemonics used by the AMD assembler are not quite the same |
| 42 | as the ones in the User's Manual. We use the ones that the |
| 43 | assembler uses. */ |
| 44 | static void |
| 45 | print_special (num, info) |
| 46 | unsigned int num; |
| 47 | struct disassemble_info *info; |
| 48 | { |
| 49 | /* Register names of registers 0-SPEC0_NUM-1. */ |
| 50 | static char *spec0_names[] = { |
| 51 | "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr", |
| 52 | "pc0", "pc1", "pc2", "mmu", "lru", "rsn", "rma0", "rmc0", "rma1", "rmc1", |
| 53 | "spc0", "spc1", "spc2", "iba0", "ibc0", "iba1", "ibc1", "dba", "dbc", |
| 54 | "cir", "cdr" |
| 55 | }; |
| 56 | #define SPEC0_NUM ((sizeof spec0_names) / (sizeof spec0_names[0])) |
| 57 | |
| 58 | /* Register names of registers 128-128+SPEC128_NUM-1. */ |
| 59 | static char *spec128_names[] = { |
| 60 | "ipc", "ipa", "ipb", "q", "alu", "bp", "fc", "cr" |
| 61 | }; |
| 62 | #define SPEC128_NUM ((sizeof spec128_names) / (sizeof spec128_names[0])) |
| 63 | |
| 64 | /* Register names of registers 160-160+SPEC160_NUM-1. */ |
| 65 | static char *spec160_names[] = { |
| 66 | "fpe", "inte", "fps", "sr163", "exop" |
| 67 | }; |
| 68 | #define SPEC160_NUM ((sizeof spec160_names) / (sizeof spec160_names[0])) |
| 69 | |
| 70 | if (num < SPEC0_NUM) |
| 71 | (*info->fprintf_func) (info->stream, spec0_names[num]); |
| 72 | else if (num >= 128 && num < 128 + SPEC128_NUM) |
| 73 | (*info->fprintf_func) (info->stream, spec128_names[num-128]); |
| 74 | else if (num >= 160 && num < 160 + SPEC160_NUM) |
| 75 | (*info->fprintf_func) (info->stream, spec160_names[num-160]); |
| 76 | else |
| 77 | (*info->fprintf_func) (info->stream, "sr%d", num); |
| 78 | } |
| 79 | |
| 80 | /* Is an instruction with OPCODE a delayed branch? */ |
| 81 | static int |
| 82 | is_delayed_branch (opcode) |
| 83 | int opcode; |
| 84 | { |
| 85 | return (opcode == 0xa8 || opcode == 0xa9 || opcode == 0xa0 || opcode == 0xa1 |
| 86 | || opcode == 0xa4 || opcode == 0xa5 |
| 87 | || opcode == 0xb4 || opcode == 0xb5 |
| 88 | || opcode == 0xc4 || opcode == 0xc0 |
| 89 | || opcode == 0xac || opcode == 0xad |
| 90 | || opcode == 0xcc); |
| 91 | } |
| 92 | |
| 93 | /* Now find the four bytes of INSN and put them in *INSN{0,8,16,24}. */ |
| 94 | static void |
| 95 | find_bytes_big (insn, insn0, insn8, insn16, insn24) |
| 96 | char *insn; |
| 97 | unsigned char *insn0; |
| 98 | unsigned char *insn8; |
| 99 | unsigned char *insn16; |
| 100 | unsigned char *insn24; |
| 101 | { |
| 102 | *insn24 = insn[0]; |
| 103 | *insn16 = insn[1]; |
| 104 | *insn8 = insn[2]; |
| 105 | *insn0 = insn[3]; |
| 106 | } |
| 107 | |
| 108 | static void |
| 109 | find_bytes_little (insn, insn0, insn8, insn16, insn24) |
| 110 | char *insn; |
| 111 | unsigned char *insn0; |
| 112 | unsigned char *insn8; |
| 113 | unsigned char *insn16; |
| 114 | unsigned char *insn24; |
| 115 | { |
| 116 | *insn24 = insn[3]; |
| 117 | *insn16 = insn[2]; |
| 118 | *insn8 = insn[1]; |
| 119 | *insn0 = insn[0]; |
| 120 | } |
| 121 | |
| 122 | typedef void (*find_byte_func_type) |
| 123 | PARAMS ((char *, unsigned char *, unsigned char *, |
| 124 | unsigned char *, unsigned char *)); |
| 125 | |
| 126 | /* Print one instruction from MEMADDR on INFO->STREAM. |
| 127 | Return the size of the instruction (always 4 on a29k). */ |
| 128 | |
| 129 | static int |
| 130 | print_insn (memaddr, info) |
| 131 | bfd_vma memaddr; |
| 132 | struct disassemble_info *info; |
| 133 | { |
| 134 | /* The raw instruction. */ |
| 135 | char insn[4]; |
| 136 | |
| 137 | /* The four bytes of the instruction. */ |
| 138 | unsigned char insn24, insn16, insn8, insn0; |
| 139 | |
| 140 | find_byte_func_type find_byte_func = (find_byte_func_type)info->private_data; |
| 141 | |
| 142 | struct a29k_opcode CONST * opcode; |
| 143 | |
| 144 | { |
| 145 | int status = |
| 146 | (*info->read_memory_func) (memaddr, (bfd_byte *) &insn[0], 4, info); |
| 147 | if (status != 0) |
| 148 | { |
| 149 | (*info->memory_error_func) (status, memaddr, info); |
| 150 | return -1; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | (*find_byte_func) (insn, &insn0, &insn8, &insn16, &insn24); |
| 155 | |
| 156 | printf ("%02x%02x%02x%02x ", insn24, insn16, insn8, insn0); |
| 157 | |
| 158 | /* Handle the nop (aseq 0x40,gr1,gr1) specially */ |
| 159 | if ((insn24==0x70) && (insn16==0x40) && (insn8==0x01) && (insn0==0x01)) { |
| 160 | (*info->fprintf_func) (info->stream,"nop"); |
| 161 | return 4; |
| 162 | } |
| 163 | |
| 164 | /* The opcode is always in insn24. */ |
| 165 | for (opcode = &a29k_opcodes[0]; |
| 166 | opcode < &a29k_opcodes[num_opcodes]; |
| 167 | ++opcode) |
| 168 | { |
| 169 | if (((unsigned long) insn24 << 24) == opcode->opcode) |
| 170 | { |
| 171 | char *s; |
| 172 | |
| 173 | (*info->fprintf_func) (info->stream, "%s ", opcode->name); |
| 174 | for (s = opcode->args; *s != '\0'; ++s) |
| 175 | { |
| 176 | switch (*s) |
| 177 | { |
| 178 | case 'a': |
| 179 | print_general (insn8, info); |
| 180 | break; |
| 181 | |
| 182 | case 'b': |
| 183 | print_general (insn0, info); |
| 184 | break; |
| 185 | |
| 186 | case 'c': |
| 187 | print_general (insn16, info); |
| 188 | break; |
| 189 | |
| 190 | case 'i': |
| 191 | (*info->fprintf_func) (info->stream, "%d", insn0); |
| 192 | break; |
| 193 | |
| 194 | case 'x': |
| 195 | (*info->fprintf_func) (info->stream, "0x%x", (insn16 << 8) + insn0); |
| 196 | break; |
| 197 | |
| 198 | case 'h': |
| 199 | /* This used to be %x for binutils. */ |
| 200 | (*info->fprintf_func) (info->stream, "0x%x", |
| 201 | (insn16 << 24) + (insn0 << 16)); |
| 202 | break; |
| 203 | |
| 204 | case 'X': |
| 205 | (*info->fprintf_func) (info->stream, "%d", |
| 206 | ((insn16 << 8) + insn0) | 0xffff0000); |
| 207 | break; |
| 208 | |
| 209 | case 'P': |
| 210 | /* This output looks just like absolute addressing, but |
| 211 | maybe that's OK (it's what the GDB m68k and EBMON |
| 212 | a29k disassemblers do). */ |
| 213 | /* All the shifting is to sign-extend it. p*/ |
| 214 | (*info->print_address_func) |
| 215 | (memaddr + |
| 216 | (((int)((insn16 << 10) + (insn0 << 2)) << 14) >> 14), |
| 217 | info); |
| 218 | break; |
| 219 | |
| 220 | case 'A': |
| 221 | (*info->print_address_func) |
| 222 | ((insn16 << 10) + (insn0 << 2), info); |
| 223 | break; |
| 224 | |
| 225 | case 'e': |
| 226 | (*info->fprintf_func) (info->stream, "%d", insn16 >> 7); |
| 227 | break; |
| 228 | |
| 229 | case 'n': |
| 230 | (*info->fprintf_func) (info->stream, "0x%x", insn16 & 0x7f); |
| 231 | break; |
| 232 | |
| 233 | case 'v': |
| 234 | (*info->fprintf_func) (info->stream, "0x%x", insn16); |
| 235 | break; |
| 236 | |
| 237 | case 's': |
| 238 | print_special (insn8, info); |
| 239 | break; |
| 240 | |
| 241 | case 'u': |
| 242 | (*info->fprintf_func) (info->stream, "%d", insn0 >> 7); |
| 243 | break; |
| 244 | |
| 245 | case 'r': |
| 246 | (*info->fprintf_func) (info->stream, "%d", (insn0 >> 4) & 7); |
| 247 | break; |
| 248 | |
| 249 | case 'I': |
| 250 | if ((insn16 & 3) != 0) |
| 251 | (*info->fprintf_func) (info->stream, "%d", insn16 & 3); |
| 252 | break; |
| 253 | |
| 254 | case 'd': |
| 255 | (*info->fprintf_func) (info->stream, "%d", (insn0 >> 2) & 3); |
| 256 | break; |
| 257 | |
| 258 | case 'f': |
| 259 | (*info->fprintf_func) (info->stream, "%d", insn0 & 3); |
| 260 | break; |
| 261 | |
| 262 | case 'F': |
| 263 | (*info->fprintf_func) (info->stream, "%d", (insn16 >> 2) & 15); |
| 264 | break; |
| 265 | |
| 266 | case 'C': |
| 267 | (*info->fprintf_func) (info->stream, "%d", insn16 & 3); |
| 268 | break; |
| 269 | |
| 270 | default: |
| 271 | (*info->fprintf_func) (info->stream, "%c", *s); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /* Now we look for a const,consth pair of instructions, |
| 276 | in which case we try to print the symbolic address. */ |
| 277 | if (insn24 == 2) /* consth */ |
| 278 | { |
| 279 | int errcode; |
| 280 | char prev_insn[4]; |
| 281 | unsigned char prev_insn0, prev_insn8, prev_insn16, prev_insn24; |
| 282 | |
| 283 | errcode = (*info->read_memory_func) (memaddr - 4, |
| 284 | (bfd_byte *) &prev_insn[0], |
| 285 | 4, |
| 286 | info); |
| 287 | if (errcode == 0) |
| 288 | { |
| 289 | /* If it is a delayed branch, we need to look at the |
| 290 | instruction before the delayed brach to handle |
| 291 | things like |
| 292 | |
| 293 | const _foo |
| 294 | call _printf |
| 295 | consth _foo |
| 296 | */ |
| 297 | (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8, |
| 298 | &prev_insn16, &prev_insn24); |
| 299 | if (is_delayed_branch (prev_insn24)) |
| 300 | { |
| 301 | errcode = (*info->read_memory_func) |
| 302 | (memaddr - 8, (bfd_byte *) &prev_insn[0], 4, info); |
| 303 | (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8, |
| 304 | &prev_insn16, &prev_insn24); |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | /* If there was a problem reading memory, then assume |
| 309 | the previous instruction was not const. */ |
| 310 | if (errcode == 0) |
| 311 | { |
| 312 | /* Is it const to the same register? */ |
| 313 | if (prev_insn24 == 3 |
| 314 | && prev_insn8 == insn8) |
| 315 | { |
| 316 | (*info->fprintf_func) (info->stream, "\t; "); |
| 317 | (*info->print_address_func) |
| 318 | (((insn16 << 24) + (insn0 << 16) |
| 319 | + (prev_insn16 << 8) + (prev_insn0)), |
| 320 | info); |
| 321 | } |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | return 4; |
| 326 | } |
| 327 | } |
| 328 | /* This used to be %8x for binutils. */ |
| 329 | (*info->fprintf_func) |
| 330 | (info->stream, ".word 0x%08x", |
| 331 | (insn24 << 24) + (insn16 << 16) + (insn8 << 8) + insn0); |
| 332 | return 4; |
| 333 | } |
| 334 | |
| 335 | /* Disassemble an big-endian a29k instruction. */ |
| 336 | int |
| 337 | print_insn_big_a29k (memaddr, info) |
| 338 | bfd_vma memaddr; |
| 339 | struct disassemble_info *info; |
| 340 | { |
| 341 | info->private_data = (PTR) find_bytes_big; |
| 342 | return print_insn (memaddr, info); |
| 343 | } |
| 344 | |
| 345 | /* Disassemble a little-endian a29k instruction. */ |
| 346 | int |
| 347 | print_insn_little_a29k (memaddr, info) |
| 348 | bfd_vma memaddr; |
| 349 | struct disassemble_info *info; |
| 350 | { |
| 351 | info->private_data = (PTR) find_bytes_little; |
| 352 | return print_insn (memaddr, info); |
| 353 | } |