| 1 | /* Print instructions for the Motorola 88000, for GDB and GNU Binutils. |
| 2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1993, 1998, 2000, 2001 |
| 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "sysdep.h" |
| 24 | #include "dis-asm.h" |
| 25 | #include "opcode/m88k.h" |
| 26 | #include "opintl.h" |
| 27 | |
| 28 | INSTAB *hashtable[HASHVAL] = {0}; |
| 29 | |
| 30 | static int |
| 31 | m88kdis PARAMS ((bfd_vma, unsigned long, struct disassemble_info *)); |
| 32 | |
| 33 | static void |
| 34 | printop PARAMS ((struct disassemble_info *, OPSPEC *, unsigned long, bfd_vma, int)); |
| 35 | |
| 36 | static void |
| 37 | init_disasm PARAMS ((void)); |
| 38 | |
| 39 | static void |
| 40 | install PARAMS ((INSTAB *instptr)); |
| 41 | \f |
| 42 | |
| 43 | /* Disassemble an M88000 instruction at `memaddr'. */ |
| 44 | |
| 45 | int |
| 46 | print_insn_m88k (memaddr, info) |
| 47 | bfd_vma memaddr; |
| 48 | struct disassemble_info *info; |
| 49 | { |
| 50 | bfd_byte buffer[4]; |
| 51 | int status; |
| 52 | |
| 53 | /* Instruction addresses may have low two bits set. Clear them. */ |
| 54 | memaddr &=~ (bfd_vma) 3; |
| 55 | |
| 56 | status = (*info->read_memory_func) (memaddr, buffer, 4, info); |
| 57 | if (status != 0) |
| 58 | { |
| 59 | (*info->memory_error_func) (status, memaddr, info); |
| 60 | return -1; |
| 61 | } |
| 62 | |
| 63 | return m88kdis (memaddr, bfd_getb32 (buffer), info); |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * Disassemble the instruction in `instruction'. |
| 68 | * `pc' should be the address of this instruction, it will be used to |
| 69 | * print the target address if this is a relative jump or call the |
| 70 | * disassembled instruction is written to `info'. |
| 71 | * |
| 72 | * The function returns the length of this instruction in bytes. |
| 73 | */ |
| 74 | |
| 75 | static int |
| 76 | m88kdis (pc, instruction, info) |
| 77 | bfd_vma pc; |
| 78 | unsigned long instruction; |
| 79 | struct disassemble_info *info; |
| 80 | { |
| 81 | static int ihashtab_initialized = 0; |
| 82 | unsigned int opcode; |
| 83 | INSTAB *entry_ptr; |
| 84 | int opmask; |
| 85 | unsigned int class; |
| 86 | |
| 87 | if (! ihashtab_initialized) |
| 88 | init_disasm (); |
| 89 | |
| 90 | /* Create the appropriate mask to isolate the opcode. */ |
| 91 | opmask = DEFMASK; |
| 92 | class = instruction & DEFMASK; |
| 93 | if ((class >= SFU0) && (class <= SFU7)) |
| 94 | { |
| 95 | if (instruction < SFU1) |
| 96 | opmask = CTRLMASK; |
| 97 | else |
| 98 | opmask = SFUMASK; |
| 99 | } |
| 100 | else if (class == RRR) |
| 101 | opmask = RRRMASK; |
| 102 | else if (class == RRI10) |
| 103 | opmask = RRI10MASK; |
| 104 | |
| 105 | /* Isolate the opcode. */ |
| 106 | opcode = instruction & opmask; |
| 107 | |
| 108 | /* Search the hash table with the isolated opcode. */ |
| 109 | for (entry_ptr = hashtable[opcode % HASHVAL]; |
| 110 | (entry_ptr != NULL) && (entry_ptr->opcode != opcode); |
| 111 | entry_ptr = entry_ptr->next) |
| 112 | ; |
| 113 | |
| 114 | if (entry_ptr == NULL) |
| 115 | (*info->fprintf_func) (info->stream, "word\t%08x", instruction); |
| 116 | else |
| 117 | { |
| 118 | (*info->fprintf_func) (info->stream, "%s", entry_ptr->mnemonic); |
| 119 | printop (info, &(entry_ptr->op1), instruction, pc, 1); |
| 120 | printop (info, &(entry_ptr->op2), instruction, pc, 0); |
| 121 | printop (info, &(entry_ptr->op3), instruction, pc, 0); |
| 122 | } |
| 123 | |
| 124 | return 4; |
| 125 | } |
| 126 | \f |
| 127 | /* |
| 128 | * Decode an Operand of an instruction. |
| 129 | * |
| 130 | * This function formats and writes an operand of an instruction to |
| 131 | * info based on the operand specification. When the `first' flag is |
| 132 | * set this is the first operand of an instruction. Undefined operand |
| 133 | * types cause a <dis error> message. |
| 134 | * |
| 135 | * Parameters: |
| 136 | * disassemble_info where the operand may be printed |
| 137 | * OPSPEC *opptr pointer to an operand specification |
| 138 | * UINT inst instruction from which operand is extracted |
| 139 | * UINT pc pc of instruction; used for pc-relative disp. |
| 140 | * int first flag which if nonzero indicates the first |
| 141 | * operand of an instruction |
| 142 | * |
| 143 | * The operand specified is extracted from the instruction and is |
| 144 | * written to buf in the format specified. The operand is preceded by |
| 145 | * a comma if it is not the first operand of an instruction and it is |
| 146 | * not a register indirect form. Registers are preceded by 'r' and |
| 147 | * hex values by '0x'. |
| 148 | */ |
| 149 | |
| 150 | static void |
| 151 | printop (info, opptr, inst, pc, first) |
| 152 | struct disassemble_info *info; |
| 153 | OPSPEC *opptr; |
| 154 | unsigned long inst; |
| 155 | bfd_vma pc; |
| 156 | int first; |
| 157 | { |
| 158 | int extracted_field; |
| 159 | char *cond_mask_sym; |
| 160 | |
| 161 | if (opptr->width == 0) |
| 162 | return; |
| 163 | |
| 164 | if (! first) |
| 165 | { |
| 166 | switch (opptr->type) |
| 167 | { |
| 168 | case REGSC: |
| 169 | case CONT: |
| 170 | break; |
| 171 | default: |
| 172 | (*info->fprintf_func) (info->stream, ","); |
| 173 | break; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | switch (opptr->type) |
| 178 | { |
| 179 | case CRREG: |
| 180 | (*info->fprintf_func) (info->stream, "cr%d", |
| 181 | UEXT (inst, opptr->offset, opptr->width)); |
| 182 | break; |
| 183 | |
| 184 | case FCRREG: |
| 185 | (*info->fprintf_func) (info->stream, "fcr%d", |
| 186 | UEXT (inst, opptr->offset, opptr->width)); |
| 187 | break; |
| 188 | |
| 189 | case REGSC: |
| 190 | (*info->fprintf_func) (info->stream, "[r%d]", |
| 191 | UEXT (inst, opptr->offset, opptr->width)); |
| 192 | break; |
| 193 | |
| 194 | case REG: |
| 195 | (*info->fprintf_func) (info->stream, "r%d", |
| 196 | UEXT (inst, opptr->offset, opptr->width)); |
| 197 | break; |
| 198 | |
| 199 | case XREG: |
| 200 | (*info->fprintf_func) (info->stream, "x%d", |
| 201 | UEXT (inst, opptr->offset, opptr->width)); |
| 202 | break; |
| 203 | |
| 204 | case HEX: |
| 205 | extracted_field = UEXT (inst, opptr->offset, opptr->width); |
| 206 | if (extracted_field == 0) |
| 207 | (*info->fprintf_func) (info->stream, "0"); |
| 208 | else |
| 209 | (*info->fprintf_func) (info->stream, "0x%02x", extracted_field); |
| 210 | break; |
| 211 | |
| 212 | case DEC: |
| 213 | extracted_field = UEXT (inst, opptr->offset, opptr->width); |
| 214 | (*info->fprintf_func) (info->stream, "%d", extracted_field); |
| 215 | break; |
| 216 | |
| 217 | case CONDMASK: |
| 218 | extracted_field = UEXT (inst, opptr->offset, opptr->width); |
| 219 | switch (extracted_field & 0x0f) |
| 220 | { |
| 221 | case 0x1: cond_mask_sym = "gt0"; break; |
| 222 | case 0x2: cond_mask_sym = "eq0"; break; |
| 223 | case 0x3: cond_mask_sym = "ge0"; break; |
| 224 | case 0xc: cond_mask_sym = "lt0"; break; |
| 225 | case 0xd: cond_mask_sym = "ne0"; break; |
| 226 | case 0xe: cond_mask_sym = "le0"; break; |
| 227 | default: cond_mask_sym = NULL; break; |
| 228 | } |
| 229 | if (cond_mask_sym != NULL) |
| 230 | (*info->fprintf_func) (info->stream, "%s", cond_mask_sym); |
| 231 | else |
| 232 | (*info->fprintf_func) (info->stream, "%x", extracted_field); |
| 233 | break; |
| 234 | |
| 235 | case PCREL: |
| 236 | (*info->print_address_func) |
| 237 | (pc + (4 * (SEXT (inst, opptr->offset, opptr->width))), |
| 238 | info); |
| 239 | break; |
| 240 | |
| 241 | case CONT: |
| 242 | (*info->fprintf_func) (info->stream, "%d,r%d", |
| 243 | UEXT (inst, opptr->offset, 5), |
| 244 | UEXT (inst, (opptr->offset) + 5, 5)); |
| 245 | break; |
| 246 | |
| 247 | case BF: |
| 248 | (*info->fprintf_func) (info->stream, "%d<%d>", |
| 249 | UEXT (inst, (opptr->offset) + 5, 5), |
| 250 | UEXT (inst, opptr->offset, 5)); |
| 251 | break; |
| 252 | |
| 253 | default: |
| 254 | /* xgettext:c-format */ |
| 255 | (*info->fprintf_func) (info->stream, _("# <dis error: %08x>"), inst); |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Initialize the disassembler instruction table. |
| 261 | * |
| 262 | * Initialize the hash table and instruction table for the |
| 263 | * disassembler. This should be called once before the first call to |
| 264 | * disasm(). |
| 265 | */ |
| 266 | |
| 267 | static void |
| 268 | init_disasm () |
| 269 | { |
| 270 | int i, size; |
| 271 | |
| 272 | for (i = 0; i < HASHVAL; i++) |
| 273 | hashtable[i] = NULL; |
| 274 | |
| 275 | size = sizeof (instructions) / sizeof (INSTAB); |
| 276 | for (i = 0; i < size; i++) |
| 277 | install (&instructions[i]); |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Insert an instruction into the disassembler table by hashing the |
| 282 | * opcode and inserting it into the linked list for that hash value. |
| 283 | */ |
| 284 | |
| 285 | static void |
| 286 | install (instptr) |
| 287 | INSTAB *instptr; |
| 288 | { |
| 289 | unsigned int i; |
| 290 | |
| 291 | i = (instptr->opcode) % HASHVAL; |
| 292 | instptr->next = hashtable[i]; |
| 293 | hashtable[i] = instptr; |
| 294 | } |