| 1 | /* Print instructions for the Motorola 88000, for GDB and GNU Binutils. |
| 2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991 Free Software Foundation, Inc. |
| 3 | Contributed by Data General Corporation, November 1989. |
| 4 | Partially derived from an earlier printcmd.c. |
| 5 | |
| 6 | This file is part of GDB and the GNU Binutils. |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 21 | |
| 22 | #include <stdio.h> |
| 23 | #include "m88k-opcode.h" |
| 24 | #include "defs.h" |
| 25 | #include "symtab.h" |
| 26 | |
| 27 | void sprint_address (); |
| 28 | |
| 29 | INSTAB *hashtable[HASHVAL] = {0}; |
| 30 | |
| 31 | /* |
| 32 | * Disassemble an M88000 Instruction |
| 33 | * |
| 34 | * |
| 35 | * This module decodes the first instruction in inbuf. It uses the pc |
| 36 | * to display pc-relative displacements. It writes the disassembled |
| 37 | * instruction in outbuf. |
| 38 | * |
| 39 | * Revision History |
| 40 | * |
| 41 | * Revision 1.0 11/08/85 Creation date by Motorola |
| 42 | * 05/11/89 R. Trawick adapted to GDB interface. |
| 43 | */ |
| 44 | #define MAXLEN 20 |
| 45 | |
| 46 | print_insn (memaddr, stream) |
| 47 | CORE_ADDR memaddr; |
| 48 | FILE *stream; |
| 49 | { |
| 50 | unsigned char buffer[MAXLEN]; |
| 51 | /* should be expanded if disassembler prints symbol names */ |
| 52 | char outbuf[100]; |
| 53 | int n; |
| 54 | |
| 55 | /* Instruction addresses may have low two bits set. Clear them. */ |
| 56 | memaddr&= 0xfffffffc; |
| 57 | read_memory (memaddr, buffer, MAXLEN); |
| 58 | |
| 59 | n = m88kdis ((int)memaddr, buffer, outbuf); |
| 60 | |
| 61 | fputs (outbuf, stream); |
| 62 | |
| 63 | return (n); |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * disassemble the first instruction in 'inbuf'. |
| 68 | * 'pc' should be the address of this instruction, it will |
| 69 | * be used to print the target address if this is a relative jump or call |
| 70 | * 'outbuf' gets filled in with the disassembled instruction. It should |
| 71 | * be long enough to hold the longest disassembled instruction. |
| 72 | * 100 bytes is certainly enough, unless symbol printing is added later |
| 73 | * The function returns the length of this instruction in bytes. |
| 74 | */ |
| 75 | |
| 76 | int m88kdis( pc, inbuf, outbuf ) |
| 77 | |
| 78 | int pc; |
| 79 | int *inbuf; |
| 80 | char *outbuf; |
| 81 | |
| 82 | { static ihashtab_initialized = 0; |
| 83 | int instruction; |
| 84 | unsigned int opcode; |
| 85 | INSTAB *entry_ptr; |
| 86 | int opmask; |
| 87 | int class; |
| 88 | |
| 89 | instruction= *inbuf; |
| 90 | |
| 91 | if (!ihashtab_initialized) { |
| 92 | init_disasm(); |
| 93 | } |
| 94 | |
| 95 | /* create a the appropriate mask to isolate the opcode */ |
| 96 | opmask= DEFMASK; |
| 97 | class= instruction & DEFMASK; |
| 98 | if ((class >= SFU0) && (class <= SFU7)) { |
| 99 | if (instruction < SFU1) { |
| 100 | opmask= CTRLMASK; |
| 101 | } else { |
| 102 | opmask= SFUMASK; |
| 103 | } |
| 104 | } else if (class == RRR) { |
| 105 | opmask= RRRMASK; |
| 106 | } else if (class == RRI10) { |
| 107 | opmask= RRI10MASK; |
| 108 | } |
| 109 | |
| 110 | /* isolate the opcode */ |
| 111 | opcode= instruction & opmask; |
| 112 | |
| 113 | /* search the hash table with the isolated opcode */ |
| 114 | for (entry_ptr= hashtable[ opcode % HASHVAL ]; |
| 115 | (entry_ptr != NULL) && (entry_ptr->opcode != opcode); |
| 116 | entry_ptr= entry_ptr->next) { |
| 117 | } |
| 118 | |
| 119 | if (entry_ptr == NULL) { |
| 120 | sprintf( outbuf, "word\t%08x", instruction ); |
| 121 | } else { |
| 122 | sprintf( outbuf, "%s\t", entry_ptr->mnemonic ); |
| 123 | sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op1), instruction, pc, 1 ); |
| 124 | sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op2), instruction, pc, 0 ); |
| 125 | sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op3), instruction, pc, 0 ); |
| 126 | } |
| 127 | |
| 128 | |
| 129 | return 4; |
| 130 | } |
| 131 | \f |
| 132 | |
| 133 | /* |
| 134 | * Decode an Operand of an Instruction |
| 135 | * |
| 136 | * Functional Description |
| 137 | * |
| 138 | * This module formats and writes an operand of an instruction to buf |
| 139 | * based on the operand specification. When the first flag is set this |
| 140 | * is the first operand of an instruction. Undefined operand types |
| 141 | * cause a <dis error> message. |
| 142 | * |
| 143 | * Parameters |
| 144 | * char *buf buffer where the operand may be printed |
| 145 | * OPSPEC *opptr Pointer to an operand specification |
| 146 | * UINT inst Instruction from which operand is extracted |
| 147 | * UINT pc PC of instruction; used for pc-relative disp. |
| 148 | * int first Flag which if nonzero indicates the first |
| 149 | * operand of an instruction |
| 150 | * |
| 151 | * Output |
| 152 | * |
| 153 | * The operand specified is extracted from the instruction and is |
| 154 | * written to buf in the format specified. The operand is preceded |
| 155 | * by a comma if it is not the first operand of an instruction and it |
| 156 | * is not a register indirect form. Registers are preceded by 'r' and |
| 157 | * hex values by '0x'. |
| 158 | * |
| 159 | * Revision History |
| 160 | * |
| 161 | * Revision 1.0 11/08/85 Creation date |
| 162 | */ |
| 163 | |
| 164 | sprintop( buf, opptr, inst, pc, first ) |
| 165 | |
| 166 | char *buf; |
| 167 | OPSPEC *opptr; |
| 168 | UINT inst; |
| 169 | int pc; |
| 170 | int first; |
| 171 | |
| 172 | { int extracted_field; |
| 173 | char *cond_mask_sym; |
| 174 | char cond_mask_sym_buf[6]; |
| 175 | |
| 176 | if (opptr->width == 0) |
| 177 | return; |
| 178 | |
| 179 | switch(opptr->type) { |
| 180 | case CRREG: |
| 181 | if (!first) |
| 182 | *buf++= ','; |
| 183 | sprintf( buf, "cr%d", UEXT(inst,opptr->offset,opptr->width)); |
| 184 | break; |
| 185 | |
| 186 | case FCRREG: |
| 187 | if (!first) |
| 188 | *buf++= ','; |
| 189 | sprintf( buf, "fcr%d", UEXT(inst,opptr->offset,opptr->width)); |
| 190 | break; |
| 191 | |
| 192 | case REGSC: |
| 193 | sprintf( buf, "[r%d]", UEXT(inst,opptr->offset,opptr->width)); |
| 194 | break; |
| 195 | |
| 196 | case REG: |
| 197 | if (!first) |
| 198 | *buf++= ','; |
| 199 | sprintf( buf, "r%d", UEXT(inst,opptr->offset,opptr->width)); |
| 200 | break; |
| 201 | |
| 202 | case HEX: |
| 203 | if (!first) |
| 204 | *buf++= ','; |
| 205 | extracted_field= UEXT(inst, opptr->offset, opptr->width); |
| 206 | if (extracted_field == 0) { |
| 207 | sprintf( buf, "0" ); |
| 208 | } else { |
| 209 | sprintf( buf, "0x%02x", extracted_field ); |
| 210 | } |
| 211 | break; |
| 212 | |
| 213 | case CONDMASK: |
| 214 | if (!first) |
| 215 | *buf++= ','; |
| 216 | extracted_field= UEXT(inst, opptr->offset, opptr->width); |
| 217 | switch (extracted_field & 0x0f) { |
| 218 | case 0x1: cond_mask_sym= "gt0"; |
| 219 | break; |
| 220 | case 0x2: cond_mask_sym= "eq0"; |
| 221 | break; |
| 222 | case 0x3: cond_mask_sym= "ge0"; |
| 223 | break; |
| 224 | case 0xc: cond_mask_sym= "lt0"; |
| 225 | break; |
| 226 | case 0xd: cond_mask_sym= "ne0"; |
| 227 | break; |
| 228 | case 0xe: cond_mask_sym= "le0"; |
| 229 | break; |
| 230 | default: cond_mask_sym= cond_mask_sym_buf; |
| 231 | sprintf( cond_mask_sym_buf, |
| 232 | "%x", |
| 233 | extracted_field ); |
| 234 | break; |
| 235 | } |
| 236 | strcpy( buf, cond_mask_sym ); |
| 237 | break; |
| 238 | |
| 239 | case PCREL: |
| 240 | if (!first) |
| 241 | *buf++= ','; |
| 242 | sprint_address( pc + 4*(SEXT(inst,opptr->offset,opptr->width)), |
| 243 | buf ); |
| 244 | break; |
| 245 | |
| 246 | case CONT: |
| 247 | sprintf( buf, |
| 248 | "%d,r%d", |
| 249 | UEXT(inst,opptr->offset,5), |
| 250 | UEXT(inst,(opptr->offset)+5,5) ); |
| 251 | break; |
| 252 | |
| 253 | case BF: |
| 254 | if (!first) |
| 255 | *buf++= ','; |
| 256 | sprintf( buf, |
| 257 | "%d<%d>", |
| 258 | UEXT(inst,(opptr->offset)+5,5), |
| 259 | UEXT(inst,opptr->offset,5)); |
| 260 | break; |
| 261 | |
| 262 | default: |
| 263 | sprintf( buf, "<dis error: %08x>", inst ); |
| 264 | } |
| 265 | |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Initialize the Disassembler Instruction Table |
| 270 | * |
| 271 | * Initialize the hash table and instruction table for the disassembler. |
| 272 | * This should be called once before the first call to disasm(). |
| 273 | * |
| 274 | * Parameters |
| 275 | * |
| 276 | * Output |
| 277 | * |
| 278 | * If the debug option is selected, certain statistics about the hashing |
| 279 | * distribution are written to stdout. |
| 280 | * |
| 281 | * Revision History |
| 282 | * |
| 283 | * Revision 1.0 11/08/85 Creation date |
| 284 | */ |
| 285 | |
| 286 | init_disasm() |
| 287 | { |
| 288 | int i,size; |
| 289 | |
| 290 | for (i=0 ; i < HASHVAL ; i++) |
| 291 | hashtable[i] = NULL; |
| 292 | |
| 293 | for (i=0, size = sizeof(instructions) / sizeof(INSTAB) ; i < size ; |
| 294 | install(&instructions[i++])); |
| 295 | |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Insert an instruction into the disassembler table by hashing the |
| 300 | * opcode and inserting it into the linked list for that hash value. |
| 301 | * |
| 302 | * Parameters |
| 303 | * |
| 304 | * INSTAB *instptr Pointer to the entry in the instruction table |
| 305 | * to be installed |
| 306 | * |
| 307 | * Revision 1.0 11/08/85 Creation date |
| 308 | * 05/11/89 R. TRAWICK ADAPTED FROM MOTOROLA |
| 309 | */ |
| 310 | |
| 311 | install(instptr) |
| 312 | INSTAB *instptr; |
| 313 | { |
| 314 | UINT i; |
| 315 | |
| 316 | i = (instptr->opcode) % HASHVAL; |
| 317 | instptr->next = hashtable[i]; |
| 318 | hashtable[i] = instptr; |
| 319 | } |
| 320 | \f |
| 321 | |
| 322 | /* adapted from print_address in printcmd by R. Trawick 5/15/89. The two should |
| 323 | be combined. |
| 324 | */ |
| 325 | |
| 326 | void sprint_address (addr, buffer) |
| 327 | |
| 328 | CORE_ADDR addr; |
| 329 | char *buffer; |
| 330 | |
| 331 | { |
| 332 | register int i; |
| 333 | struct symbol *fs; |
| 334 | char *name; |
| 335 | int name_location; |
| 336 | |
| 337 | sprintf ( buffer, "0x%x", addr); |
| 338 | |
| 339 | fs = find_pc_function (addr); |
| 340 | |
| 341 | if (!fs) { |
| 342 | i = find_pc_misc_function (addr); |
| 343 | |
| 344 | if (i < 0) return; /* If nothing comes through, don't |
| 345 | print anything symbolic */ |
| 346 | |
| 347 | name = misc_function_vector[i].name; |
| 348 | name_location = misc_function_vector[i].address; |
| 349 | } else { |
| 350 | name = fs->name; |
| 351 | name_location = BLOCK_START (SYMBOL_BLOCK_VALUE (fs)); |
| 352 | } |
| 353 | |
| 354 | if (addr - name_location) |
| 355 | sprintf (buffer, " <%s+%d>", name, addr - name_location); |
| 356 | else |
| 357 | sprintf (buffer, " <%s>", name); |
| 358 | } |