1 /* Instruction printing code for the AMD 29000 2 Copyright 1990, 1993, 1994, 1995, 1998, 2000, 2001, 2002 3 Free Software Foundation, Inc. 4 Contributed by Cygnus Support. Written by Jim Kingdon. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 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 program; if not, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 21 22 #include "sysdep.h" 23 #include "dis-asm.h" 24 #include "opcode/a29k.h" 25 26 static void print_general PARAMS ((int, struct disassemble_info *)); 27 static void print_special PARAMS ((unsigned int, struct disassemble_info *)); 28 static int is_delayed_branch PARAMS ((int)); 29 static void find_bytes_little 30 PARAMS ((char *, unsigned char *, unsigned char *, unsigned char *, 31 unsigned char *)); 32 static void find_bytes_big 33 PARAMS ((char *, unsigned char *, unsigned char *, unsigned char *, 34 unsigned char *)); 35 static int print_insn PARAMS ((bfd_vma, struct disassemble_info *)); 36 37 38 /* Print a symbolic representation of a general-purpose 39 register number NUM on STREAM. 40 NUM is a number as found in the instruction, not as found in 41 debugging symbols; it must be in the range 0-255. */ 42 static void 43 print_general (num, info) 44 int num; 45 struct disassemble_info *info; 46 { 47 if (num < 128) 48 (*info->fprintf_func) (info->stream, "gr%d", num); 49 else 50 (*info->fprintf_func) (info->stream, "lr%d", num - 128); 51 } 52 53 /* Like print_general but a special-purpose register. 54 55 The mnemonics used by the AMD assembler are not quite the same 56 as the ones in the User's Manual. We use the ones that the 57 assembler uses. */ 58 static void 59 print_special (num, info) 60 unsigned int num; 61 struct disassemble_info *info; 62 { 63 /* Register names of registers 0-SPEC0_NUM-1. */ 64 static char *spec0_names[] = { 65 "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr", 66 "pc0", "pc1", "pc2", "mmu", "lru", "rsn", "rma0", "rmc0", "rma1", "rmc1", 67 "spc0", "spc1", "spc2", "iba0", "ibc0", "iba1", "ibc1", "dba", "dbc", 68 "cir", "cdr" 69 }; 70 #define SPEC0_NUM ((sizeof spec0_names) / (sizeof spec0_names[0])) 71 72 /* Register names of registers 128-128+SPEC128_NUM-1. */ 73 static char *spec128_names[] = { 74 "ipc", "ipa", "ipb", "q", "alu", "bp", "fc", "cr" 75 }; 76 #define SPEC128_NUM ((sizeof spec128_names) / (sizeof spec128_names[0])) 77 78 /* Register names of registers 160-160+SPEC160_NUM-1. */ 79 static char *spec160_names[] = { 80 "fpe", "inte", "fps", "sr163", "exop" 81 }; 82 #define SPEC160_NUM ((sizeof spec160_names) / (sizeof spec160_names[0])) 83 84 if (num < SPEC0_NUM) 85 (*info->fprintf_func) (info->stream, spec0_names[num]); 86 else if (num >= 128 && num < 128 + SPEC128_NUM) 87 (*info->fprintf_func) (info->stream, spec128_names[num-128]); 88 else if (num >= 160 && num < 160 + SPEC160_NUM) 89 (*info->fprintf_func) (info->stream, spec160_names[num-160]); 90 else 91 (*info->fprintf_func) (info->stream, "sr%d", num); 92 } 93 94 /* Is an instruction with OPCODE a delayed branch? */ 95 static int 96 is_delayed_branch (opcode) 97 int opcode; 98 { 99 return (opcode == 0xa8 || opcode == 0xa9 || opcode == 0xa0 || opcode == 0xa1 100 || opcode == 0xa4 || opcode == 0xa5 101 || opcode == 0xb4 || opcode == 0xb5 102 || opcode == 0xc4 || opcode == 0xc0 103 || opcode == 0xac || opcode == 0xad 104 || opcode == 0xcc); 105 } 106 107 /* Now find the four bytes of INSN and put them in *INSN{0,8,16,24}. */ 108 static void 109 find_bytes_big (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[0]; 117 *insn16 = insn[1]; 118 *insn8 = insn[2]; 119 *insn0 = insn[3]; 120 } 121 122 static void 123 find_bytes_little (insn, insn0, insn8, insn16, insn24) 124 char *insn; 125 unsigned char *insn0; 126 unsigned char *insn8; 127 unsigned char *insn16; 128 unsigned char *insn24; 129 { 130 *insn24 = insn[3]; 131 *insn16 = insn[2]; 132 *insn8 = insn[1]; 133 *insn0 = insn[0]; 134 } 135 136 typedef void (*find_byte_func_type) 137 PARAMS ((char *, unsigned char *, unsigned char *, 138 unsigned char *, unsigned char *)); 139 140 /* Print one instruction from MEMADDR on INFO->STREAM. 141 Return the size of the instruction (always 4 on a29k). */ 142 143 static int 144 print_insn (memaddr, info) 145 bfd_vma memaddr; 146 struct disassemble_info *info; 147 { 148 /* The raw instruction. */ 149 char insn[4]; 150 151 /* The four bytes of the instruction. */ 152 unsigned char insn24, insn16, insn8, insn0; 153 154 find_byte_func_type find_byte_func = (find_byte_func_type)info->private_data; 155 156 struct a29k_opcode const * opcode; 157 158 { 159 int status = 160 (*info->read_memory_func) (memaddr, (bfd_byte *) &insn[0], 4, info); 161 if (status != 0) 162 { 163 (*info->memory_error_func) (status, memaddr, info); 164 return -1; 165 } 166 } 167 168 (*find_byte_func) (insn, &insn0, &insn8, &insn16, &insn24); 169 170 printf ("%02x%02x%02x%02x ", insn24, insn16, insn8, insn0); 171 172 /* Handle the nop (aseq 0x40,gr1,gr1) specially */ 173 if ((insn24==0x70) && (insn16==0x40) && (insn8==0x01) && (insn0==0x01)) { 174 (*info->fprintf_func) (info->stream,"nop"); 175 return 4; 176 } 177 178 /* The opcode is always in insn24. */ 179 for (opcode = &a29k_opcodes[0]; 180 opcode < &a29k_opcodes[num_opcodes]; 181 ++opcode) 182 { 183 if (((unsigned long) insn24 << 24) == opcode->opcode) 184 { 185 char *s; 186 187 (*info->fprintf_func) (info->stream, "%s ", opcode->name); 188 for (s = opcode->args; *s != '\0'; ++s) 189 { 190 switch (*s) 191 { 192 case 'a': 193 print_general (insn8, info); 194 break; 195 196 case 'b': 197 print_general (insn0, info); 198 break; 199 200 case 'c': 201 print_general (insn16, info); 202 break; 203 204 case 'i': 205 (*info->fprintf_func) (info->stream, "%d", insn0); 206 break; 207 208 case 'x': 209 (*info->fprintf_func) (info->stream, "0x%x", (insn16 << 8) + insn0); 210 break; 211 212 case 'h': 213 /* This used to be %x for binutils. */ 214 (*info->fprintf_func) (info->stream, "0x%x", 215 (insn16 << 24) + (insn0 << 16)); 216 break; 217 218 case 'X': 219 (*info->fprintf_func) (info->stream, "%d", 220 ((insn16 << 8) + insn0) | 0xffff0000); 221 break; 222 223 case 'P': 224 /* This output looks just like absolute addressing, but 225 maybe that's OK (it's what the GDB m68k and EBMON 226 a29k disassemblers do). */ 227 /* All the shifting is to sign-extend it. p*/ 228 (*info->print_address_func) 229 (memaddr + 230 (((int)((insn16 << 10) + (insn0 << 2)) << 14) >> 14), 231 info); 232 break; 233 234 case 'A': 235 (*info->print_address_func) 236 ((insn16 << 10) + (insn0 << 2), info); 237 break; 238 239 case 'e': 240 (*info->fprintf_func) (info->stream, "%d", insn16 >> 7); 241 break; 242 243 case 'n': 244 (*info->fprintf_func) (info->stream, "0x%x", insn16 & 0x7f); 245 break; 246 247 case 'v': 248 (*info->fprintf_func) (info->stream, "0x%x", insn16); 249 break; 250 251 case 's': 252 print_special (insn8, info); 253 break; 254 255 case 'u': 256 (*info->fprintf_func) (info->stream, "%d", insn0 >> 7); 257 break; 258 259 case 'r': 260 (*info->fprintf_func) (info->stream, "%d", (insn0 >> 4) & 7); 261 break; 262 263 case 'I': 264 if ((insn16 & 3) != 0) 265 (*info->fprintf_func) (info->stream, "%d", insn16 & 3); 266 break; 267 268 case 'd': 269 (*info->fprintf_func) (info->stream, "%d", (insn0 >> 2) & 3); 270 break; 271 272 case 'f': 273 (*info->fprintf_func) (info->stream, "%d", insn0 & 3); 274 break; 275 276 case 'F': 277 (*info->fprintf_func) (info->stream, "%d", (insn16 >> 2) & 15); 278 break; 279 280 case 'C': 281 (*info->fprintf_func) (info->stream, "%d", insn16 & 3); 282 break; 283 284 default: 285 (*info->fprintf_func) (info->stream, "%c", *s); 286 } 287 } 288 289 /* Now we look for a const,consth pair of instructions, 290 in which case we try to print the symbolic address. */ 291 if (insn24 == 2) /* consth */ 292 { 293 int errcode; 294 char prev_insn[4]; 295 unsigned char prev_insn0, prev_insn8, prev_insn16, prev_insn24; 296 297 errcode = (*info->read_memory_func) (memaddr - 4, 298 (bfd_byte *) &prev_insn[0], 299 4, 300 info); 301 if (errcode == 0) 302 { 303 /* If it is a delayed branch, we need to look at the 304 instruction before the delayed brach to handle 305 things like 306 307 const _foo 308 call _printf 309 consth _foo 310 */ 311 (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8, 312 &prev_insn16, &prev_insn24); 313 if (is_delayed_branch (prev_insn24)) 314 { 315 errcode = (*info->read_memory_func) 316 (memaddr - 8, (bfd_byte *) &prev_insn[0], 4, info); 317 (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8, 318 &prev_insn16, &prev_insn24); 319 } 320 } 321 322 /* If there was a problem reading memory, then assume 323 the previous instruction was not const. */ 324 if (errcode == 0) 325 { 326 /* Is it const to the same register? */ 327 if (prev_insn24 == 3 328 && prev_insn8 == insn8) 329 { 330 (*info->fprintf_func) (info->stream, "\t; "); 331 (*info->print_address_func) 332 (((insn16 << 24) + (insn0 << 16) 333 + (prev_insn16 << 8) + (prev_insn0)), 334 info); 335 } 336 } 337 } 338 339 return 4; 340 } 341 } 342 /* This used to be %8x for binutils. */ 343 (*info->fprintf_func) 344 (info->stream, ".word 0x%08x", 345 (insn24 << 24) + (insn16 << 16) + (insn8 << 8) + insn0); 346 return 4; 347 } 348 349 /* Disassemble an big-endian a29k instruction. */ 350 int 351 print_insn_big_a29k (memaddr, info) 352 bfd_vma memaddr; 353 struct disassemble_info *info; 354 { 355 info->private_data = (PTR) find_bytes_big; 356 return print_insn (memaddr, info); 357 } 358 359 /* Disassemble a little-endian a29k instruction. */ 360 int 361 print_insn_little_a29k (memaddr, info) 362 bfd_vma memaddr; 363 struct disassemble_info *info; 364 { 365 info->private_data = (PTR) find_bytes_little; 366 return print_insn (memaddr, info); 367 } 368