source: trunk/src/binutils/opcodes/d30v-dis.c@ 73

Last change on this file since 73 was 10, checked in by bird, 23 years ago

Initial revision
  • Property cvs2svn:cvs-rev set to 1.1
  • Property svn:eol-style set to native
  • Property svn:executable set to *
File size: 9.8 KB
Line 
1/* Disassemble D30V instructions.
2 Copyright 1997, 1998, 2000 Free Software Foundation, Inc.
3
4This program is free software; you can redistribute it and/or modify
5it under the terms of the GNU General Public License as published by
6the Free Software Foundation; either version 2 of the License, or
7(at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program; if not, write to the Free Software
16Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18#include <stdio.h>
19#include "sysdep.h"
20#include "opcode/d30v.h"
21#include "dis-asm.h"
22#include "opintl.h"
23
24#define PC_MASK 0xFFFFFFFF
25
26static int lookup_opcode PARAMS (( struct d30v_insn *insn, long num, int is_long ));
27static void print_insn PARAMS (( struct disassemble_info *info, bfd_vma memaddr, long long num,
28 struct d30v_insn *insn, int is_long, int show_ext ));
29static int extract_value PARAMS (( long long num, struct d30v_operand *oper, int is_long ));
30
31int
32print_insn_d30v (memaddr, info)
33 bfd_vma memaddr;
34 struct disassemble_info *info;
35{
36 int status, result;
37 bfd_byte buffer[12];
38 unsigned long in1,in2;
39 struct d30v_insn insn;
40 long long num;
41
42 insn.form = (struct d30v_format *)NULL;
43
44 info->bytes_per_line = 8;
45 info->bytes_per_chunk = 4;
46 info->display_endian = BFD_ENDIAN_BIG;
47
48 status = (*info->read_memory_func) (memaddr, buffer, 4, info);
49 if (status != 0)
50 {
51 (*info->memory_error_func) (status, memaddr, info);
52 return -1;
53 }
54 in1 = bfd_getb32 (buffer);
55
56 status = (*info->read_memory_func) (memaddr+4, buffer, 4, info);
57 if (status != 0)
58 {
59 info->bytes_per_line = 8;
60 if (!(result = lookup_opcode(&insn, in1, 0)))
61 (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
62 else
63 print_insn(info, memaddr, (long long) in1, &insn, 0, result);
64 return 4;
65 }
66 in2 = bfd_getb32 (buffer);
67
68 if (in1 & in2 & FM01)
69 {
70 /* LONG instruction */
71 if (!(result = lookup_opcode(&insn, in1, 1)))
72 {
73 (*info->fprintf_func) (info->stream, ".long\t0x%x,0x%x",in1,in2);
74 return 8;
75 }
76 num = (long long)in1 << 32 | in2;
77 print_insn(info, memaddr, num, &insn, 1, result);
78 }
79 else
80 {
81 num = in1;
82 if (!(result = lookup_opcode(&insn, in1, 0)))
83 (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
84 else
85 print_insn(info, memaddr, num, &insn, 0, result);
86
87 switch ( ((in1>>31)<<1) | (in2>>31) )
88 {
89 case 0:
90 (*info->fprintf_func) (info->stream, "\t||\t");
91 break;
92 case 1:
93 (*info->fprintf_func) (info->stream, "\t->\t");
94 break;
95 case 2:
96 (*info->fprintf_func) (info->stream, "\t<-\t");
97 default:
98 break;
99 }
100
101 insn.form = (struct d30v_format *)NULL;
102 num = in2;
103 if (!(result = lookup_opcode(&insn, in2, 0)))
104 (*info->fprintf_func) (info->stream, ".long\t0x%x",in2);
105 else
106 print_insn(info, memaddr, num, &insn, 0, result);
107
108 }
109 return 8;
110}
111
112
113/* returns 0 if lookup fails */
114/* 1 if found and only one form */
115/* 2 if found and there are short and long forms */
116static int
117lookup_opcode (insn, num, is_long)
118 struct d30v_insn *insn;
119 long num;
120 int is_long;
121{
122 int i=0, index;
123 struct d30v_format *f;
124 struct d30v_opcode *op = (struct d30v_opcode *)d30v_opcode_table;
125 int op1 = (num >> 25) & 0x7;
126 int op2 = (num >> 20) & 0x1f;
127 int mod = (num >> 18) & 0x3;
128
129 /* find the opcode */
130 do {
131 if ((op->op1 == op1) && (op->op2 == op2))
132 break;
133 op++;
134 } while (op->name);
135
136 if (!op || !op->name)
137 return 0;
138
139 while (op->op1 == op1 && op->op2 == op2)
140 {
141 /* scan through all the formats for the opcode */
142 index = op->format[i++];
143 do
144 {
145 f = (struct d30v_format *)&d30v_format_table[index];
146 while (f->form == index)
147 {
148 if ((!is_long || f->form >= LONG) && (f->modifier == mod))
149 {
150 insn->form = f;
151 break;
152 }
153 f++;
154 }
155 if (insn->form)
156 break;
157 } while ((index = op->format[i++]) != 0);
158 if (insn->form)
159 break;
160 op++;
161 i=0;
162 }
163 if (insn->form == NULL)
164 return 0;
165
166 insn->op = op;
167 insn->ecc = (num >> 28) & 0x7;
168 if (op->format[1])
169 return 2;
170 else
171 return 1;
172}
173
174
175static void
176print_insn ( info, memaddr, num, insn, is_long, show_ext )
177 struct disassemble_info *info;
178 bfd_vma memaddr;
179 long long num;
180 struct d30v_insn *insn;
181 int is_long;
182 int show_ext;
183{
184 int val, opnum, need_comma=0;
185 struct d30v_operand *oper;
186 int i, match, opind=0, need_paren=0, found_control=0;
187
188 (*info->fprintf_func) (info->stream, "%s",insn->op->name);
189
190 /* check for CMP or CMPU */
191 if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
192 {
193 opind++;
194 val = extract_value(num,(struct d30v_operand *)&d30v_operand_table[insn->form->operands[0]],is_long);
195 (*info->fprintf_func) (info->stream, "%s",d30v_cc_names[val]);
196 }
197
198 /* add in ".s" or ".l" */
199 if (show_ext == 2)
200 {
201 if (is_long)
202 (*info->fprintf_func) (info->stream, ".l");
203 else
204 (*info->fprintf_func) (info->stream, ".s");
205 }
206
207 if (insn->ecc)
208 (*info->fprintf_func) (info->stream, "/%s",d30v_ecc_names[insn->ecc]);
209
210 (*info->fprintf_func) (info->stream, "\t");
211
212 while ((opnum = insn->form->operands[opind++]) != 0)
213 {
214 int bits;
215 oper = (struct d30v_operand *)&d30v_operand_table[opnum];
216 bits = oper->bits;
217 if (oper->flags & OPERAND_SHIFT)
218 bits += 3;
219
220 if (need_comma && oper->flags != OPERAND_PLUS && oper->flags != OPERAND_MINUS)
221 {
222 need_comma=0;
223 (*info->fprintf_func) (info->stream, ", ");
224 }
225
226 if (oper->flags == OPERAND_ATMINUS)
227 {
228 (*info->fprintf_func) (info->stream, "@-");
229 continue;
230 }
231 if (oper->flags == OPERAND_MINUS)
232 {
233 (*info->fprintf_func) (info->stream, "-");
234 continue;
235 }
236 if (oper->flags == OPERAND_PLUS)
237 {
238 (*info->fprintf_func) (info->stream, "+");
239 continue;
240 }
241 if (oper->flags == OPERAND_ATSIGN)
242 {
243 (*info->fprintf_func) (info->stream, "@");
244 continue;
245 }
246 if (oper->flags == OPERAND_ATPAR)
247 {
248 (*info->fprintf_func) (info->stream, "@(");
249 need_paren = 1;
250 continue;
251 }
252
253 if (oper->flags == OPERAND_SPECIAL)
254 continue;
255
256 val = extract_value(num, oper, is_long);
257
258 if (oper->flags & OPERAND_REG)
259 {
260 match = 0;
261 if (oper->flags & OPERAND_CONTROL)
262 {
263 struct d30v_operand *oper3 =
264 (struct d30v_operand *)&d30v_operand_table[insn->form->operands[2]];
265 int id = extract_value (num, oper3, is_long );
266 found_control = 1;
267 switch ( id )
268 {
269 case 0:
270 val |= OPERAND_CONTROL;
271 break;
272 case 1:
273 case 2:
274 val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
275 break;
276 case 3:
277 val |= OPERAND_FLAG;
278 break;
279 default:
280 fprintf(stderr,"illegal id (%d)\n",id);
281 }
282 }
283 else if (oper->flags & OPERAND_ACC)
284 val |= OPERAND_ACC;
285 else if (oper->flags & OPERAND_FLAG)
286 val |= OPERAND_FLAG;
287 for (i=0;i<reg_name_cnt();i++)
288 {
289 if (val == pre_defined_registers[i].value)
290 {
291 if (pre_defined_registers[i].pname)
292 (*info->fprintf_func)
293 (info->stream, "%s",pre_defined_registers[i].pname);
294 else
295 (*info->fprintf_func)
296 (info->stream, "%s",pre_defined_registers[i].name);
297 match=1;
298 break;
299 }
300 }
301 if (match==0)
302 {
303 /* this would only get executed if a register was not in the
304 register table */
305 (*info->fprintf_func)
306 (info->stream, _("<unknown register %d>"), val & 0x3F);
307 }
308 }
309 /* repeati has a relocation, but its first argument is a plain
310 immediate. OTOH instructions like djsri have a pc-relative
311 delay target, but a absolute jump target. Therefore, a test
312 of insn->op->reloc_flag is not specific enough; we must test
313 if the actual operand we are handling now is pc-relative. */
314 else if (oper->flags & OPERAND_PCREL)
315 {
316 int neg = 0;
317
318 /* IMM6S3 is unsigned. */
319 if (oper->flags & OPERAND_SIGNED || bits == 32)
320 {
321 long max;
322 max = (1 << (bits - 1));
323 if (val & max)
324 {
325 if (bits == 32)
326 val = -val;
327 else
328 val = -val & ((1 << bits)-1);
329 neg = 1;
330 }
331 }
332 if (neg)
333 {
334 (*info->fprintf_func) (info->stream, "-%x\t(",val);
335 (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
336 (*info->fprintf_func) (info->stream, ")");
337 }
338 else
339 {
340 (*info->fprintf_func) (info->stream, "%x\t(",val);
341 (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
342 (*info->fprintf_func) (info->stream, ")");
343 }
344 }
345 else if (insn->op->reloc_flag == RELOC_ABS)
346 {
347 (*info->print_address_func) (val, info);
348 }
349 else
350 {
351 if (oper->flags & OPERAND_SIGNED)
352 {
353 int max = (1 << (bits - 1));
354 if (val & max)
355 {
356 val = -val;
357 if (bits < 32)
358 val &= ((1 << bits) - 1);
359 (*info->fprintf_func) (info->stream, "-");
360 }
361 }
362 (*info->fprintf_func) (info->stream, "0x%x",val);
363 }
364 /* if there is another operand, then write a comma and space */
365 if (insn->form->operands[opind] && !(found_control && opind == 2))
366 need_comma = 1;
367 }
368 if (need_paren)
369 (*info->fprintf_func) (info->stream, ")");
370}
371
372
373
374static int
375extract_value (num, oper, is_long)
376 long long num;
377 struct d30v_operand *oper;
378 int is_long;
379{
380 int val;
381 int shift = 12 - oper->position;
382 int mask = (0xFFFFFFFF >> (32 - oper->bits));
383
384 if (is_long)
385 {
386 if (oper->bits == 32)
387 {
388 /* piece together 32-bit constant */
389 val = ((num & 0x3FFFF)
390 | ((num & 0xFF00000) >> 2)
391 | ((num & 0x3F00000000LL) >> 6));
392 }
393 else
394 val = (num >> (32 + shift)) & mask;
395 }
396 else
397 val = (num >> shift) & mask;
398
399 if (oper->flags & OPERAND_SHIFT)
400 val <<= 3;
401
402 return val;
403}
Note: See TracBrowser for help on using the repository browser.