| 1 | /* Print instructions for the Motorola 88000, for GDB and GNU Binutils. |
| 2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1993 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Data General Corporation, November 1989. |
| 5 | Partially derived from an earlier printcmd.c. |
| 6 | |
| 7 | This file is part of GDB and the GNU Binutils. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 22 | |
| 23 | #include "dis-asm.h" |
| 24 | #include "opcode/m88k.h" |
| 25 | |
| 26 | /* FIXME: Uses the internal bfd swapping routines. */ |
| 27 | #include "libbfd.h" |
| 28 | |
| 29 | INSTAB *hashtable[HASHVAL] = {0}; |
| 30 | |
| 31 | static int |
| 32 | m88kdis PARAMS ((bfd_vma, unsigned long, struct disassemble_info *)); |
| 33 | |
| 34 | static void |
| 35 | printop PARAMS ((struct disassemble_info *, OPSPEC *, |
| 36 | unsigned long, bfd_vma, int)); |
| 37 | |
| 38 | static void |
| 39 | init_disasm PARAMS ((void)); |
| 40 | |
| 41 | static void |
| 42 | install PARAMS ((INSTAB *instptr)); |
| 43 | |
| 44 | /* |
| 45 | * Disassemble an M88000 Instruction |
| 46 | * |
| 47 | * |
| 48 | * This module decodes the instruction at memaddr. |
| 49 | * |
| 50 | * Revision History |
| 51 | * |
| 52 | * Revision 1.0 11/08/85 Creation date by Motorola |
| 53 | * 05/11/89 R. Trawick adapted to GDB interface. |
| 54 | * 07/12/93 Ian Lance Taylor updated to |
| 55 | * binutils interface. |
| 56 | */ |
| 57 | |
| 58 | int |
| 59 | print_insn_m88k (memaddr, info) |
| 60 | bfd_vma memaddr; |
| 61 | struct disassemble_info *info; |
| 62 | { |
| 63 | bfd_byte buffer[4]; |
| 64 | int status; |
| 65 | |
| 66 | /* Instruction addresses may have low two bits set. Clear them. */ |
| 67 | memaddr &=~ (bfd_vma) 3; |
| 68 | |
| 69 | status = (*info->read_memory_func) (memaddr, buffer, 4, info); |
| 70 | if (status != 0) |
| 71 | { |
| 72 | (*info->memory_error_func) (status, memaddr, info); |
| 73 | return -1; |
| 74 | } |
| 75 | |
| 76 | return m88kdis (memaddr, _do_getb32 (buffer), info); |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * disassemble the instruction in 'instruction'. |
| 81 | * 'pc' should be the address of this instruction, it will |
| 82 | * be used to print the target address if this is a relative jump or call |
| 83 | * the disassembled instruction is written to 'info'. |
| 84 | * The function returns the length of this instruction in bytes. |
| 85 | */ |
| 86 | |
| 87 | static int |
| 88 | m88kdis (pc, instruction, info) |
| 89 | bfd_vma pc; |
| 90 | unsigned long instruction; |
| 91 | struct disassemble_info *info; |
| 92 | { |
| 93 | static int ihashtab_initialized = 0; |
| 94 | unsigned int opcode; |
| 95 | INSTAB *entry_ptr; |
| 96 | int opmask; |
| 97 | int class; |
| 98 | |
| 99 | if (! ihashtab_initialized) |
| 100 | init_disasm (); |
| 101 | |
| 102 | /* create a the appropriate mask to isolate the opcode */ |
| 103 | opmask = DEFMASK; |
| 104 | class = instruction & DEFMASK; |
| 105 | if ((class >= SFU0) && (class <= SFU7)) |
| 106 | { |
| 107 | if (instruction < SFU1) |
| 108 | opmask = CTRLMASK; |
| 109 | else |
| 110 | opmask = SFUMASK; |
| 111 | } |
| 112 | else if (class == RRR) |
| 113 | opmask = RRRMASK; |
| 114 | else if (class == RRI10) |
| 115 | opmask = RRI10MASK; |
| 116 | |
| 117 | /* isolate the opcode */ |
| 118 | opcode = instruction & opmask; |
| 119 | |
| 120 | /* search the hash table with the isolated opcode */ |
| 121 | for (entry_ptr = hashtable[opcode % HASHVAL]; |
| 122 | (entry_ptr != NULL) && (entry_ptr->opcode != opcode); |
| 123 | entry_ptr = entry_ptr->next) |
| 124 | ; |
| 125 | |
| 126 | if (entry_ptr == NULL) |
| 127 | (*info->fprintf_func) (info->stream, "word\t%08x", instruction); |
| 128 | else |
| 129 | { |
| 130 | (*info->fprintf_func) (info->stream, "%s ", entry_ptr->mnemonic); |
| 131 | printop (info, &(entry_ptr->op1), instruction, pc, 1); |
| 132 | printop (info, &(entry_ptr->op2), instruction, pc, 0); |
| 133 | printop (info, &(entry_ptr->op3), instruction, pc, 0); |
| 134 | } |
| 135 | |
| 136 | return 4; |
| 137 | } |
| 138 | \f |
| 139 | /* |
| 140 | * Decode an Operand of an Instruction |
| 141 | * |
| 142 | * Functional Description |
| 143 | * |
| 144 | * This module formats and writes an operand of an instruction to info |
| 145 | * based on the operand specification. When the first flag is set this |
| 146 | * is the first operand of an instruction. Undefined operand types |
| 147 | * cause a <dis error> message. |
| 148 | * |
| 149 | * Parameters |
| 150 | * disassemble_info where the operand may be printed |
| 151 | * OPSPEC *opptr Pointer to an operand specification |
| 152 | * UINT inst Instruction from which operand is extracted |
| 153 | * UINT pc PC of instruction; used for pc-relative disp. |
| 154 | * int first Flag which if nonzero indicates the first |
| 155 | * operand of an instruction |
| 156 | * |
| 157 | * Output |
| 158 | * |
| 159 | * The operand specified is extracted from the instruction and is |
| 160 | * written to buf in the format specified. The operand is preceded |
| 161 | * by a comma if it is not the first operand of an instruction and it |
| 162 | * is not a register indirect form. Registers are preceded by 'r' and |
| 163 | * hex values by '0x'. |
| 164 | * |
| 165 | * Revision History |
| 166 | * |
| 167 | * Revision 1.0 11/08/85 Creation date |
| 168 | */ |
| 169 | |
| 170 | static void |
| 171 | printop (info, opptr, inst, pc, first) |
| 172 | struct disassemble_info *info; |
| 173 | OPSPEC *opptr; |
| 174 | unsigned long inst; |
| 175 | bfd_vma pc; |
| 176 | int first; |
| 177 | { |
| 178 | int extracted_field; |
| 179 | char *cond_mask_sym; |
| 180 | |
| 181 | if (opptr->width == 0) |
| 182 | return; |
| 183 | |
| 184 | if (! first) |
| 185 | { |
| 186 | switch (opptr->type) |
| 187 | { |
| 188 | case REGSC: |
| 189 | case CONT: |
| 190 | break; |
| 191 | default: |
| 192 | (*info->fprintf_func) (info->stream, ","); |
| 193 | break; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | switch (opptr->type) |
| 198 | { |
| 199 | case CRREG: |
| 200 | (*info->fprintf_func) (info->stream, "cr%d", |
| 201 | UEXT (inst, opptr->offset, opptr->width)); |
| 202 | break; |
| 203 | |
| 204 | case FCRREG: |
| 205 | (*info->fprintf_func) (info->stream, "fcr%d", |
| 206 | UEXT (inst, opptr->offset, opptr->width)); |
| 207 | break; |
| 208 | |
| 209 | case REGSC: |
| 210 | (*info->fprintf_func) (info->stream, "[r%d]", |
| 211 | UEXT (inst, opptr->offset, opptr->width)); |
| 212 | break; |
| 213 | |
| 214 | case REG: |
| 215 | (*info->fprintf_func) (info->stream, "r%d", |
| 216 | UEXT (inst, opptr->offset, opptr->width)); |
| 217 | break; |
| 218 | |
| 219 | case HEX: |
| 220 | extracted_field = UEXT (inst, opptr->offset, opptr->width); |
| 221 | if (extracted_field == 0) |
| 222 | (*info->fprintf_func) (info->stream, "0"); |
| 223 | else |
| 224 | (*info->fprintf_func) (info->stream, "0x%02x", extracted_field); |
| 225 | break; |
| 226 | |
| 227 | case CONDMASK: |
| 228 | extracted_field = UEXT (inst, opptr->offset, opptr->width); |
| 229 | switch (extracted_field & 0x0f) |
| 230 | { |
| 231 | case 0x1: cond_mask_sym = "gt0"; break; |
| 232 | case 0x2: cond_mask_sym = "eq0"; break; |
| 233 | case 0x3: cond_mask_sym = "ge0"; break; |
| 234 | case 0xc: cond_mask_sym = "lt0"; break; |
| 235 | case 0xd: cond_mask_sym = "ne0"; break; |
| 236 | case 0xe: cond_mask_sym = "le0"; break; |
| 237 | default: cond_mask_sym = NULL; break; |
| 238 | } |
| 239 | if (cond_mask_sym != NULL) |
| 240 | (*info->fprintf_func) (info->stream, "%s", cond_mask_sym); |
| 241 | else |
| 242 | (*info->fprintf_func) (info->stream, "%x", extracted_field); |
| 243 | break; |
| 244 | |
| 245 | case PCREL: |
| 246 | (*info->print_address_func) |
| 247 | (pc + (4 * (SEXT (inst, opptr->offset, opptr->width))), |
| 248 | info); |
| 249 | break; |
| 250 | |
| 251 | case CONT: |
| 252 | (*info->fprintf_func) (info->stream, "%d,r%d", |
| 253 | UEXT (inst, opptr->offset, 5), |
| 254 | UEXT (inst, (opptr->offset) + 5, 5)); |
| 255 | break; |
| 256 | |
| 257 | case BF: |
| 258 | (*info->fprintf_func) (info->stream, "%d<%d>", |
| 259 | UEXT (inst, (opptr->offset) + 5, 5), |
| 260 | UEXT (inst, opptr->offset, 5)); |
| 261 | break; |
| 262 | |
| 263 | default: |
| 264 | (*info->fprintf_func) (info->stream, "# <dis error: %08x>", inst); |
| 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 | static void |
| 287 | init_disasm () |
| 288 | { |
| 289 | int i, size; |
| 290 | |
| 291 | for (i = 0; i < HASHVAL; i++) |
| 292 | hashtable[i] = NULL; |
| 293 | |
| 294 | size = sizeof (instructions) / sizeof (INSTAB); |
| 295 | for (i = 0; i < size; i++) |
| 296 | install (&instructions[i]); |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Insert an instruction into the disassembler table by hashing the |
| 301 | * opcode and inserting it into the linked list for that hash value. |
| 302 | * |
| 303 | * Parameters |
| 304 | * |
| 305 | * INSTAB *instptr Pointer to the entry in the instruction table |
| 306 | * to be installed |
| 307 | * |
| 308 | * Revision 1.0 11/08/85 Creation date |
| 309 | * 05/11/89 R. TRAWICK ADAPTED FROM MOTOROLA |
| 310 | */ |
| 311 | |
| 312 | static void |
| 313 | install (instptr) |
| 314 | INSTAB *instptr; |
| 315 | { |
| 316 | unsigned int i; |
| 317 | |
| 318 | i = (instptr->opcode) % HASHVAL; |
| 319 | instptr->next = hashtable[i]; |
| 320 | hashtable[i] = instptr; |
| 321 | } |