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252b5132 RH |
1 | /* Print instructions for the Motorola 88000, for GDB and GNU Binutils. |
2 | Copyright (c) 1986, 1987, 1988, 1989, 1990, 1991, 1993, 1998 | |
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 | ||
0d8dfecf | 23 | #include "sysdep.h" |
252b5132 RH |
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 *, | |
35 | unsigned long, bfd_vma, int)); | |
36 | ||
37 | static void | |
38 | init_disasm PARAMS ((void)); | |
39 | ||
40 | static void | |
41 | install PARAMS ((INSTAB *instptr)); | |
42 | ||
43 | /* | |
44 | * Disassemble an M88000 Instruction | |
45 | * | |
46 | * | |
47 | * This module decodes the instruction at memaddr. | |
48 | * | |
49 | * Revision History | |
50 | * | |
51 | * Revision 1.0 11/08/85 Creation date by Motorola | |
52 | * 05/11/89 R. Trawick adapted to GDB interface. | |
53 | * 07/12/93 Ian Lance Taylor updated to | |
54 | * binutils interface. | |
55 | */ | |
56 | ||
57 | int | |
58 | print_insn_m88k (memaddr, info) | |
59 | bfd_vma memaddr; | |
60 | struct disassemble_info *info; | |
61 | { | |
62 | bfd_byte buffer[4]; | |
63 | int status; | |
64 | ||
65 | /* Instruction addresses may have low two bits set. Clear them. */ | |
66 | memaddr &=~ (bfd_vma) 3; | |
67 | ||
68 | status = (*info->read_memory_func) (memaddr, buffer, 4, info); | |
69 | if (status != 0) | |
70 | { | |
71 | (*info->memory_error_func) (status, memaddr, info); | |
72 | return -1; | |
73 | } | |
74 | ||
75 | return m88kdis (memaddr, bfd_getb32 (buffer), info); | |
76 | } | |
77 | ||
78 | /* | |
79 | * disassemble the instruction in 'instruction'. | |
80 | * 'pc' should be the address of this instruction, it will | |
81 | * be used to print the target address if this is a relative jump or call | |
82 | * the disassembled instruction is written to 'info'. | |
83 | * The function returns the length of this instruction in bytes. | |
84 | */ | |
85 | ||
86 | static int | |
87 | m88kdis (pc, instruction, info) | |
88 | bfd_vma pc; | |
89 | unsigned long instruction; | |
90 | struct disassemble_info *info; | |
91 | { | |
92 | static int ihashtab_initialized = 0; | |
93 | unsigned int opcode; | |
94 | INSTAB *entry_ptr; | |
95 | int opmask; | |
96 | unsigned int class; | |
97 | ||
98 | if (! ihashtab_initialized) | |
99 | init_disasm (); | |
100 | ||
101 | /* create the appropriate mask to isolate the opcode */ | |
102 | opmask = DEFMASK; | |
103 | class = instruction & DEFMASK; | |
104 | if ((class >= SFU0) && (class <= SFU7)) | |
105 | { | |
106 | if (instruction < SFU1) | |
107 | opmask = CTRLMASK; | |
108 | else | |
109 | opmask = SFUMASK; | |
110 | } | |
111 | else if (class == RRR) | |
112 | opmask = RRRMASK; | |
113 | else if (class == RRI10) | |
114 | opmask = RRI10MASK; | |
115 | ||
116 | /* isolate the opcode */ | |
117 | opcode = instruction & opmask; | |
118 | ||
119 | /* search the hash table with the isolated opcode */ | |
120 | for (entry_ptr = hashtable[opcode % HASHVAL]; | |
121 | (entry_ptr != NULL) && (entry_ptr->opcode != opcode); | |
122 | entry_ptr = entry_ptr->next) | |
123 | ; | |
124 | ||
125 | if (entry_ptr == NULL) | |
126 | (*info->fprintf_func) (info->stream, "word\t%08x", instruction); | |
127 | else | |
128 | { | |
129 | (*info->fprintf_func) (info->stream, "%s", entry_ptr->mnemonic); | |
130 | printop (info, &(entry_ptr->op1), instruction, pc, 1); | |
131 | printop (info, &(entry_ptr->op2), instruction, pc, 0); | |
132 | printop (info, &(entry_ptr->op3), instruction, pc, 0); | |
133 | } | |
134 | ||
135 | return 4; | |
136 | } | |
137 | \f | |
138 | /* | |
139 | * Decode an Operand of an Instruction | |
140 | * | |
141 | * Functional Description | |
142 | * | |
143 | * This module formats and writes an operand of an instruction to info | |
144 | * based on the operand specification. When the first flag is set this | |
145 | * is the first operand of an instruction. Undefined operand types | |
146 | * cause a <dis error> message. | |
147 | * | |
148 | * Parameters | |
149 | * disassemble_info where the operand may be printed | |
150 | * OPSPEC *opptr Pointer to an operand specification | |
151 | * UINT inst Instruction from which operand is extracted | |
152 | * UINT pc PC of instruction; used for pc-relative disp. | |
153 | * int first Flag which if nonzero indicates the first | |
154 | * operand of an instruction | |
155 | * | |
156 | * Output | |
157 | * | |
158 | * The operand specified is extracted from the instruction and is | |
159 | * written to buf in the format specified. The operand is preceded | |
160 | * by a comma if it is not the first operand of an instruction and it | |
161 | * is not a register indirect form. Registers are preceded by 'r' and | |
162 | * hex values by '0x'. | |
163 | * | |
164 | * Revision History | |
165 | * | |
166 | * Revision 1.0 11/08/85 Creation date | |
167 | */ | |
168 | ||
169 | static void | |
170 | printop (info, opptr, inst, pc, first) | |
171 | struct disassemble_info *info; | |
172 | OPSPEC *opptr; | |
173 | unsigned long inst; | |
174 | bfd_vma pc; | |
175 | int first; | |
176 | { | |
177 | int extracted_field; | |
178 | char *cond_mask_sym; | |
179 | ||
180 | if (opptr->width == 0) | |
181 | return; | |
182 | ||
183 | if (! first) | |
184 | { | |
185 | switch (opptr->type) | |
186 | { | |
187 | case REGSC: | |
188 | case CONT: | |
189 | break; | |
190 | default: | |
191 | (*info->fprintf_func) (info->stream, ","); | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
196 | switch (opptr->type) | |
197 | { | |
198 | case CRREG: | |
199 | (*info->fprintf_func) (info->stream, "cr%d", | |
200 | UEXT (inst, opptr->offset, opptr->width)); | |
201 | break; | |
202 | ||
203 | case FCRREG: | |
204 | (*info->fprintf_func) (info->stream, "fcr%d", | |
205 | UEXT (inst, opptr->offset, opptr->width)); | |
206 | break; | |
207 | ||
208 | case REGSC: | |
209 | (*info->fprintf_func) (info->stream, "[r%d]", | |
210 | UEXT (inst, opptr->offset, opptr->width)); | |
211 | break; | |
212 | ||
213 | case REG: | |
214 | (*info->fprintf_func) (info->stream, "r%d", | |
215 | UEXT (inst, opptr->offset, opptr->width)); | |
216 | break; | |
217 | ||
218 | case XREG: | |
219 | (*info->fprintf_func) (info->stream, "x%d", | |
220 | UEXT (inst, opptr->offset, opptr->width)); | |
221 | break; | |
222 | ||
223 | case HEX: | |
224 | extracted_field = UEXT (inst, opptr->offset, opptr->width); | |
225 | if (extracted_field == 0) | |
226 | (*info->fprintf_func) (info->stream, "0"); | |
227 | else | |
228 | (*info->fprintf_func) (info->stream, "0x%02x", extracted_field); | |
229 | break; | |
230 | ||
231 | case DEC: | |
232 | extracted_field = UEXT (inst, opptr->offset, opptr->width); | |
233 | (*info->fprintf_func) (info->stream, "%d", extracted_field); | |
234 | break; | |
235 | ||
236 | case CONDMASK: | |
237 | extracted_field = UEXT (inst, opptr->offset, opptr->width); | |
238 | switch (extracted_field & 0x0f) | |
239 | { | |
240 | case 0x1: cond_mask_sym = "gt0"; break; | |
241 | case 0x2: cond_mask_sym = "eq0"; break; | |
242 | case 0x3: cond_mask_sym = "ge0"; break; | |
243 | case 0xc: cond_mask_sym = "lt0"; break; | |
244 | case 0xd: cond_mask_sym = "ne0"; break; | |
245 | case 0xe: cond_mask_sym = "le0"; break; | |
246 | default: cond_mask_sym = NULL; break; | |
247 | } | |
248 | if (cond_mask_sym != NULL) | |
249 | (*info->fprintf_func) (info->stream, "%s", cond_mask_sym); | |
250 | else | |
251 | (*info->fprintf_func) (info->stream, "%x", extracted_field); | |
252 | break; | |
253 | ||
254 | case PCREL: | |
255 | (*info->print_address_func) | |
256 | (pc + (4 * (SEXT (inst, opptr->offset, opptr->width))), | |
257 | info); | |
258 | break; | |
259 | ||
260 | case CONT: | |
261 | (*info->fprintf_func) (info->stream, "%d,r%d", | |
262 | UEXT (inst, opptr->offset, 5), | |
263 | UEXT (inst, (opptr->offset) + 5, 5)); | |
264 | break; | |
265 | ||
266 | case BF: | |
267 | (*info->fprintf_func) (info->stream, "%d<%d>", | |
268 | UEXT (inst, (opptr->offset) + 5, 5), | |
269 | UEXT (inst, opptr->offset, 5)); | |
270 | break; | |
271 | ||
272 | default: | |
273 | /* xgettext:c-format */ | |
274 | (*info->fprintf_func) (info->stream, _("# <dis error: %08x>"), inst); | |
275 | } | |
276 | } | |
277 | ||
278 | /* | |
279 | * Initialize the Disassembler Instruction Table | |
280 | * | |
281 | * Initialize the hash table and instruction table for the disassembler. | |
282 | * This should be called once before the first call to disasm(). | |
283 | * | |
284 | * Parameters | |
285 | * | |
286 | * Output | |
287 | * | |
288 | * If the debug option is selected, certain statistics about the hashing | |
289 | * distribution are written to stdout. | |
290 | * | |
291 | * Revision History | |
292 | * | |
293 | * Revision 1.0 11/08/85 Creation date | |
294 | */ | |
295 | ||
296 | static void | |
297 | init_disasm () | |
298 | { | |
299 | int i, size; | |
300 | ||
301 | for (i = 0; i < HASHVAL; i++) | |
302 | hashtable[i] = NULL; | |
303 | ||
304 | size = sizeof (instructions) / sizeof (INSTAB); | |
305 | for (i = 0; i < size; i++) | |
306 | install (&instructions[i]); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Insert an instruction into the disassembler table by hashing the | |
311 | * opcode and inserting it into the linked list for that hash value. | |
312 | * | |
313 | * Parameters | |
314 | * | |
315 | * INSTAB *instptr Pointer to the entry in the instruction table | |
316 | * to be installed | |
317 | * | |
318 | * Revision 1.0 11/08/85 Creation date | |
319 | * 05/11/89 R. TRAWICK ADAPTED FROM MOTOROLA | |
320 | */ | |
321 | ||
322 | static void | |
323 | install (instptr) | |
324 | INSTAB *instptr; | |
325 | { | |
326 | unsigned int i; | |
327 | ||
328 | i = (instptr->opcode) % HASHVAL; | |
329 | instptr->next = hashtable[i]; | |
330 | hashtable[i] = instptr; | |
331 | } |