1 /* Disassemble D30V instructions.
2 Copyright 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, 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
26 static int lookup_opcode PARAMS ((struct d30v_insn *insn, long num, int is_long));
27 static 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));
29 static int extract_value PARAMS ((long long num, struct d30v_operand *oper, int is_long));
30
31 int
print_insn_d30v(memaddr,info)32 print_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 return 8;
109 }
110
111 /* Return 0 if lookup fails,
112 1 if found and only one form,
113 2 if found and there are short and long forms. */
114
115 static int
lookup_opcode(insn,num,is_long)116 lookup_opcode (insn, num, is_long)
117 struct d30v_insn *insn;
118 long num;
119 int is_long;
120 {
121 int i = 0, index;
122 struct d30v_format *f;
123 struct d30v_opcode *op = (struct d30v_opcode *) d30v_opcode_table;
124 int op1 = (num >> 25) & 0x7;
125 int op2 = (num >> 20) & 0x1f;
126 int mod = (num >> 18) & 0x3;
127
128 /* Find the opcode. */
129 do
130 {
131 if ((op->op1 == op1) && (op->op2 == op2))
132 break;
133 op++;
134 }
135 while (op->name);
136
137 if (!op || !op->name)
138 return 0;
139
140 while (op->op1 == op1 && op->op2 == op2)
141 {
142 /* Scan through all the formats for the opcode. */
143 index = op->format[i++];
144 do
145 {
146 f = (struct d30v_format *) &d30v_format_table[index];
147 while (f->form == index)
148 {
149 if ((!is_long || f->form >= LONG) && (f->modifier == mod))
150 {
151 insn->form = f;
152 break;
153 }
154 f++;
155 }
156 if (insn->form)
157 break;
158 }
159 while ((index = op->format[i++]) != 0);
160 if (insn->form)
161 break;
162 op++;
163 i = 0;
164 }
165 if (insn->form == NULL)
166 return 0;
167
168 insn->op = op;
169 insn->ecc = (num >> 28) & 0x7;
170 if (op->format[1])
171 return 2;
172 else
173 return 1;
174 }
175
176 static void
print_insn(info,memaddr,num,insn,is_long,show_ext)177 print_insn (info, memaddr, num, insn, is_long, show_ext)
178 struct disassemble_info *info;
179 bfd_vma memaddr;
180 long long num;
181 struct d30v_insn *insn;
182 int is_long;
183 int show_ext;
184 {
185 int val, opnum, need_comma = 0;
186 struct d30v_operand *oper;
187 int i, match, opind = 0, need_paren = 0, found_control = 0;
188
189 (*info->fprintf_func) (info->stream, "%s", insn->op->name);
190
191 /* Check for CMP or CMPU. */
192 if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
193 {
194 opind++;
195 val =
196 extract_value (num,
197 (struct d30v_operand *) &d30v_operand_table[insn->form->operands[0]],
198 is_long);
199 (*info->fprintf_func) (info->stream, "%s", d30v_cc_names[val]);
200 }
201
202 /* Add in ".s" or ".l". */
203 if (show_ext == 2)
204 {
205 if (is_long)
206 (*info->fprintf_func) (info->stream, ".l");
207 else
208 (*info->fprintf_func) (info->stream, ".s");
209 }
210
211 if (insn->ecc)
212 (*info->fprintf_func) (info->stream, "/%s", d30v_ecc_names[insn->ecc]);
213
214 (*info->fprintf_func) (info->stream, "\t");
215
216 while ((opnum = insn->form->operands[opind++]) != 0)
217 {
218 int bits;
219 oper = (struct d30v_operand *) &d30v_operand_table[opnum];
220 bits = oper->bits;
221 if (oper->flags & OPERAND_SHIFT)
222 bits += 3;
223
224 if (need_comma
225 && oper->flags != OPERAND_PLUS
226 && oper->flags != OPERAND_MINUS)
227 {
228 need_comma = 0;
229 (*info->fprintf_func) (info->stream, ", ");
230 }
231
232 if (oper->flags == OPERAND_ATMINUS)
233 {
234 (*info->fprintf_func) (info->stream, "@-");
235 continue;
236 }
237 if (oper->flags == OPERAND_MINUS)
238 {
239 (*info->fprintf_func) (info->stream, "-");
240 continue;
241 }
242 if (oper->flags == OPERAND_PLUS)
243 {
244 (*info->fprintf_func) (info->stream, "+");
245 continue;
246 }
247 if (oper->flags == OPERAND_ATSIGN)
248 {
249 (*info->fprintf_func) (info->stream, "@");
250 continue;
251 }
252 if (oper->flags == OPERAND_ATPAR)
253 {
254 (*info->fprintf_func) (info->stream, "@(");
255 need_paren = 1;
256 continue;
257 }
258
259 if (oper->flags == OPERAND_SPECIAL)
260 continue;
261
262 val = extract_value (num, oper, is_long);
263
264 if (oper->flags & OPERAND_REG)
265 {
266 match = 0;
267 if (oper->flags & OPERAND_CONTROL)
268 {
269 struct d30v_operand *oper3 =
270 (struct d30v_operand *) &d30v_operand_table[insn->form->operands[2]];
271 int id = extract_value (num, oper3, is_long);
272 found_control = 1;
273 switch (id)
274 {
275 case 0:
276 val |= OPERAND_CONTROL;
277 break;
278 case 1:
279 case 2:
280 val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
281 break;
282 case 3:
283 val |= OPERAND_FLAG;
284 break;
285 default:
286 fprintf (stderr, "illegal id (%d)\n", id);
287 }
288 }
289 else if (oper->flags & OPERAND_ACC)
290 val |= OPERAND_ACC;
291 else if (oper->flags & OPERAND_FLAG)
292 val |= OPERAND_FLAG;
293 for (i = 0; i < reg_name_cnt (); i++)
294 {
295 if (val == pre_defined_registers[i].value)
296 {
297 if (pre_defined_registers[i].pname)
298 (*info->fprintf_func)
299 (info->stream, "%s", pre_defined_registers[i].pname);
300 else
301 (*info->fprintf_func)
302 (info->stream, "%s", pre_defined_registers[i].name);
303 match = 1;
304 break;
305 }
306 }
307 if (match == 0)
308 {
309 /* This would only get executed if a register was not in
310 the register table. */
311 (*info->fprintf_func)
312 (info->stream, _("<unknown register %d>"), val & 0x3F);
313 }
314 }
315 /* repeati has a relocation, but its first argument is a plain
316 immediate. OTOH instructions like djsri have a pc-relative
317 delay target, but an absolute jump target. Therefore, a test
318 of insn->op->reloc_flag is not specific enough; we must test
319 if the actual operand we are handling now is pc-relative. */
320 else if (oper->flags & OPERAND_PCREL)
321 {
322 int neg = 0;
323
324 /* IMM6S3 is unsigned. */
325 if (oper->flags & OPERAND_SIGNED || bits == 32)
326 {
327 long max;
328 max = (1 << (bits - 1));
329 if (val & max)
330 {
331 if (bits == 32)
332 val = -val;
333 else
334 val = -val & ((1 << bits) - 1);
335 neg = 1;
336 }
337 }
338 if (neg)
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 else
345 {
346 (*info->fprintf_func) (info->stream, "%x\t(", val);
347 (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
348 (*info->fprintf_func) (info->stream, ")");
349 }
350 }
351 else if (insn->op->reloc_flag == RELOC_ABS)
352 {
353 (*info->print_address_func) (val, info);
354 }
355 else
356 {
357 if (oper->flags & OPERAND_SIGNED)
358 {
359 int max = (1 << (bits - 1));
360 if (val & max)
361 {
362 val = -val;
363 if (bits < 32)
364 val &= ((1 << bits) - 1);
365 (*info->fprintf_func) (info->stream, "-");
366 }
367 }
368 (*info->fprintf_func) (info->stream, "0x%x", val);
369 }
370 /* If there is another operand, then write a comma and space. */
371 if (insn->form->operands[opind] && !(found_control && opind == 2))
372 need_comma = 1;
373 }
374 if (need_paren)
375 (*info->fprintf_func) (info->stream, ")");
376 }
377
378 static int
extract_value(num,oper,is_long)379 extract_value (num, oper, is_long)
380 long long num;
381 struct d30v_operand *oper;
382 int is_long;
383 {
384 int val;
385 int shift = 12 - oper->position;
386 int mask = (0xFFFFFFFF >> (32 - oper->bits));
387
388 if (is_long)
389 {
390 if (oper->bits == 32)
391 {
392 /* Piece together 32-bit constant. */
393 val = ((num & 0x3FFFF)
394 | ((num & 0xFF00000) >> 2)
395 | ((num & 0x3F00000000LL) >> 6));
396 }
397 else
398 val = (num >> (32 + shift)) & mask;
399 }
400 else
401 val = (num >> shift) & mask;
402
403 if (oper->flags & OPERAND_SHIFT)
404 val <<= 3;
405
406 return val;
407 }
408