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dd3b648e RP |
1 | /* Print 32000 instructions for GDB, the GNU debugger. |
2 | Copyright (C) 1986,1988 Free Software Foundation, Inc. | |
3 | ||
4 | GDB is distributed in the hope that it will be useful, but WITHOUT ANY | |
5 | WARRANTY. No author or distributor accepts responsibility to anyone | |
6 | for the consequences of using it or for whether it serves any | |
7 | particular purpose or works at all, unless he says so in writing. | |
8 | Refer to the GDB General Public License for full details. | |
9 | ||
10 | Everyone is granted permission to copy, modify and redistribute GDB, | |
11 | but only under the conditions described in the GDB General Public | |
12 | License. A copy of this license is supposed to have been given to you | |
13 | along with GDB so you can know your rights and responsibilities. It | |
14 | should be in a file named COPYING. Among other things, the copyright | |
15 | notice and this notice must be preserved on all copies. | |
16 | ||
17 | In other words, go ahead and share GDB, but don't try to stop | |
18 | anyone else from sharing it farther. Help stamp out software hoarding! | |
19 | */ | |
20 | ||
21 | #include <stdio.h> | |
22 | ||
23 | #include "defs.h" | |
24 | #include "param.h" | |
25 | #include "symtab.h" | |
26 | #include "ns32k-opcode.h" | |
27 | #include "gdbcore.h" | |
28 | ||
29 | /* 32000 instructions are never longer than this. */ | |
30 | #define MAXLEN 62 | |
31 | ||
32 | /* Number of elements in the opcode table. */ | |
33 | #define NOPCODES (sizeof notstrs / sizeof notstrs[0]) | |
34 | ||
35 | extern char *reg_names[]; | |
36 | ||
37 | #define NEXT_IS_ADDR '|' | |
38 | ||
39 | /* | |
40 | * extract "count" bits starting "offset" bits | |
41 | * into buffer | |
42 | */ | |
43 | ||
44 | int | |
45 | bit_extract (buffer, offset, count) | |
46 | char *buffer; | |
47 | int offset; | |
48 | int count; | |
49 | { | |
50 | int result; | |
51 | int mask; | |
52 | int bit; | |
53 | ||
54 | buffer += offset >> 3; | |
55 | offset &= 7; | |
56 | bit = 1; | |
57 | result = 0; | |
58 | while (count--) | |
59 | { | |
60 | if ((*buffer & (1 << offset))) | |
61 | result |= bit; | |
62 | if (++offset == 8) | |
63 | { | |
64 | offset = 0; | |
65 | buffer++; | |
66 | } | |
67 | bit <<= 1; | |
68 | } | |
69 | return result; | |
70 | } | |
71 | ||
72 | float | |
73 | fbit_extract (buffer, offset, count) | |
74 | { | |
75 | union { | |
76 | int ival; | |
77 | float fval; | |
78 | } foo; | |
79 | ||
80 | foo.ival = bit_extract (buffer, offset, 32); | |
81 | return foo.fval; | |
82 | } | |
83 | ||
84 | double | |
85 | dbit_extract (buffer, offset, count) | |
86 | { | |
87 | union { | |
88 | struct {int low, high; } ival; | |
89 | double dval; | |
90 | } foo; | |
91 | ||
92 | foo.ival.low = bit_extract (buffer, offset, 32); | |
93 | foo.ival.high = bit_extract (buffer, offset+32, 32); | |
94 | return foo.dval; | |
95 | } | |
96 | ||
97 | sign_extend (value, bits) | |
98 | { | |
99 | value = value & ((1 << bits) - 1); | |
100 | return (value & (1 << (bits-1)) | |
101 | ? value | (~((1 << bits) - 1)) | |
102 | : value); | |
103 | } | |
104 | ||
105 | flip_bytes (ptr, count) | |
106 | char *ptr; | |
107 | int count; | |
108 | { | |
109 | char tmp; | |
110 | ||
111 | while (count > 0) | |
112 | { | |
113 | tmp = *ptr; | |
114 | ptr[0] = ptr[count-1]; | |
115 | ptr[count-1] = tmp; | |
116 | ptr++; | |
117 | count -= 2; | |
118 | } | |
119 | } | |
120 | \f | |
121 | /* Given a character C, does it represent a general addressing mode? */ | |
122 | #define Is_gen(c) \ | |
123 | ((c) == 'F' || (c) == 'L' || (c) == 'B' \ | |
124 | || (c) == 'W' || (c) == 'D' || (c) == 'A') | |
125 | ||
126 | /* Adressing modes. */ | |
127 | #define Adrmod_index_byte 0x1c | |
128 | #define Adrmod_index_word 0x1d | |
129 | #define Adrmod_index_doubleword 0x1e | |
130 | #define Adrmod_index_quadword 0x1f | |
131 | ||
132 | /* Is MODE an indexed addressing mode? */ | |
133 | #define Adrmod_is_index(mode) \ | |
134 | (mode == Adrmod_index_byte \ | |
135 | || mode == Adrmod_index_word \ | |
136 | || mode == Adrmod_index_doubleword \ | |
137 | || mode == Adrmod_index_quadword) | |
138 | ||
139 | \f | |
140 | /* Print the 32000 instruction at address MEMADDR in debugged memory, | |
141 | on STREAM. Returns length of the instruction, in bytes. */ | |
142 | ||
143 | int | |
144 | print_insn (memaddr, stream) | |
145 | CORE_ADDR memaddr; | |
146 | FILE *stream; | |
147 | { | |
148 | unsigned char buffer[MAXLEN]; | |
149 | register int i; | |
150 | register unsigned char *p; | |
151 | register char *d; | |
152 | unsigned short first_word; | |
153 | int gen, disp; | |
154 | int ioffset; /* bits into instruction */ | |
155 | int aoffset; /* bits into arguments */ | |
156 | char arg_bufs[MAX_ARGS+1][ARG_LEN]; | |
157 | int argnum; | |
158 | int maxarg; | |
159 | ||
160 | read_memory (memaddr, buffer, MAXLEN); | |
161 | ||
162 | first_word = *(unsigned short *) buffer; | |
163 | for (i = 0; i < NOPCODES; i++) | |
164 | if ((first_word & ((1 << notstrs[i].detail.obits) - 1)) | |
165 | == notstrs[i].detail.code) | |
166 | break; | |
167 | ||
168 | /* Handle undefined instructions. */ | |
169 | if (i == NOPCODES) | |
170 | { | |
171 | fprintf (stream, "0%o", buffer[0]); | |
172 | return 1; | |
173 | } | |
174 | ||
175 | fprintf (stream, "%s", notstrs[i].name); | |
176 | ||
177 | ioffset = notstrs[i].detail.ibits; | |
178 | aoffset = notstrs[i].detail.ibits; | |
179 | d = notstrs[i].detail.args; | |
180 | ||
181 | if (*d) | |
182 | { | |
183 | /* Offset in bits of the first thing beyond each index byte. | |
184 | Element 0 is for operand A and element 1 is for operand B. | |
185 | The rest are irrelevant, but we put them here so we don't | |
186 | index outside the array. */ | |
187 | int index_offset[MAX_ARGS]; | |
188 | ||
189 | /* 0 for operand A, 1 for operand B, greater for other args. */ | |
190 | int whicharg = 0; | |
191 | ||
192 | fputc ('\t', stream); | |
193 | ||
194 | maxarg = 0; | |
195 | ||
196 | /* First we have to find and keep track of the index bytes, | |
197 | if we are using scaled indexed addressing mode, since the index | |
198 | bytes occur right after the basic instruction, not as part | |
199 | of the addressing extension. */ | |
200 | if (Is_gen(d[1])) | |
201 | { | |
202 | int addr_mode = bit_extract (buffer, ioffset - 5, 5); | |
203 | ||
204 | if (Adrmod_is_index (addr_mode)) | |
205 | { | |
206 | aoffset += 8; | |
207 | index_offset[0] = aoffset; | |
208 | } | |
209 | } | |
210 | if (d[2] && Is_gen(d[3])) | |
211 | { | |
212 | int addr_mode = bit_extract (buffer, ioffset - 10, 5); | |
213 | ||
214 | if (Adrmod_is_index (addr_mode)) | |
215 | { | |
216 | aoffset += 8; | |
217 | index_offset[1] = aoffset; | |
218 | } | |
219 | } | |
220 | ||
221 | while (*d) | |
222 | { | |
223 | argnum = *d - '1'; | |
224 | d++; | |
225 | if (argnum > maxarg && argnum < MAX_ARGS) | |
226 | maxarg = argnum; | |
227 | ioffset = print_insn_arg (*d, ioffset, &aoffset, buffer, | |
228 | memaddr, arg_bufs[argnum], | |
229 | index_offset[whicharg]); | |
230 | d++; | |
231 | whicharg++; | |
232 | } | |
233 | for (argnum = 0; argnum <= maxarg; argnum++) | |
234 | { | |
235 | CORE_ADDR addr; | |
236 | char *ch, *index (); | |
237 | for (ch = arg_bufs[argnum]; *ch;) | |
238 | { | |
239 | if (*ch == NEXT_IS_ADDR) | |
240 | { | |
241 | ++ch; | |
242 | addr = atoi (ch); | |
243 | print_address (addr, stream); | |
244 | while (*ch && *ch != NEXT_IS_ADDR) | |
245 | ++ch; | |
246 | if (*ch) | |
247 | ++ch; | |
248 | } | |
249 | else | |
250 | putc (*ch++, stream); | |
251 | } | |
252 | if (argnum < maxarg) | |
253 | fprintf (stream, ", "); | |
254 | } | |
255 | } | |
256 | return aoffset / 8; | |
257 | } | |
258 | ||
259 | /* Print an instruction operand of category given by d. IOFFSET is | |
260 | the bit position below which small (<1 byte) parts of the operand can | |
261 | be found (usually in the basic instruction, but for indexed | |
262 | addressing it can be in the index byte). AOFFSETP is a pointer to the | |
263 | bit position of the addressing extension. BUFFER contains the | |
264 | instruction. ADDR is where BUFFER was read from. Put the disassembled | |
265 | version of the operand in RESULT. INDEX_OFFSET is the bit position | |
266 | of the index byte (it contains garbage if this operand is not a | |
267 | general operand using scaled indexed addressing mode). */ | |
268 | ||
269 | print_insn_arg (d, ioffset, aoffsetp, buffer, addr, result, index_offset) | |
270 | char d; | |
271 | int ioffset, *aoffsetp; | |
272 | char *buffer; | |
273 | CORE_ADDR addr; | |
274 | char *result; | |
275 | int index_offset; | |
276 | { | |
277 | int addr_mode; | |
278 | float Fvalue; | |
279 | double Lvalue; | |
280 | int Ivalue; | |
281 | int disp1, disp2; | |
282 | int index; | |
283 | ||
284 | switch (d) | |
285 | { | |
286 | case 'F': | |
287 | case 'L': | |
288 | case 'B': | |
289 | case 'W': | |
290 | case 'D': | |
291 | case 'A': | |
292 | addr_mode = bit_extract (buffer, ioffset-5, 5); | |
293 | ioffset -= 5; | |
294 | switch (addr_mode) | |
295 | { | |
296 | case 0x0: case 0x1: case 0x2: case 0x3: | |
297 | case 0x4: case 0x5: case 0x6: case 0x7: | |
298 | switch (d) | |
299 | { | |
300 | case 'F': | |
301 | case 'L': | |
302 | sprintf (result, "f%d", addr_mode); | |
303 | break; | |
304 | default: | |
305 | sprintf (result, "r%d", addr_mode); | |
306 | } | |
307 | break; | |
308 | case 0x8: case 0x9: case 0xa: case 0xb: | |
309 | case 0xc: case 0xd: case 0xe: case 0xf: | |
310 | disp1 = get_displacement (buffer, aoffsetp); | |
311 | sprintf (result, "%d(r%d)", disp1, addr_mode & 7); | |
312 | break; | |
313 | case 0x10: | |
314 | case 0x11: | |
315 | case 0x12: | |
316 | disp1 = get_displacement (buffer, aoffsetp); | |
317 | disp2 = get_displacement (buffer, aoffsetp); | |
318 | sprintf (result, "%d(%d(%s))", disp2, disp1, | |
319 | addr_mode==0x10?"fp":addr_mode==0x11?"sp":"sb"); | |
320 | break; | |
321 | case 0x13: | |
322 | sprintf (result, "reserved"); | |
323 | break; | |
324 | case 0x14: | |
325 | switch (d) | |
326 | { | |
327 | case 'B': | |
328 | Ivalue = bit_extract (buffer, *aoffsetp, 8); | |
329 | Ivalue = sign_extend (Ivalue, 8); | |
330 | *aoffsetp += 8; | |
331 | sprintf (result, "$%d", Ivalue); | |
332 | break; | |
333 | case 'W': | |
334 | Ivalue = bit_extract (buffer, *aoffsetp, 16); | |
335 | flip_bytes (&Ivalue, 2); | |
336 | *aoffsetp += 16; | |
337 | Ivalue = sign_extend (Ivalue, 16); | |
338 | sprintf (result, "$%d", Ivalue); | |
339 | break; | |
340 | case 'D': | |
341 | Ivalue = bit_extract (buffer, *aoffsetp, 32); | |
342 | flip_bytes (&Ivalue, 4); | |
343 | *aoffsetp += 32; | |
344 | sprintf (result, "$%d", Ivalue); | |
345 | break; | |
346 | case 'A': | |
347 | Ivalue = bit_extract (buffer, *aoffsetp, 32); | |
348 | flip_bytes (&Ivalue, 4); | |
349 | *aoffsetp += 32; | |
350 | sprintf (result, "$|%d|", Ivalue); | |
351 | break; | |
352 | case 'F': | |
353 | Fvalue = fbit_extract (buffer, *aoffsetp, 32); | |
354 | flip_bytes (&Fvalue, 4); | |
355 | *aoffsetp += 32; | |
356 | sprintf (result, "$%g", Fvalue); | |
357 | break; | |
358 | case 'L': | |
359 | Lvalue = dbit_extract (buffer, *aoffsetp, 64); | |
360 | flip_bytes (&Lvalue, 8); | |
361 | *aoffsetp += 64; | |
362 | sprintf (result, "$%g", Lvalue); | |
363 | break; | |
364 | } | |
365 | break; | |
366 | case 0x15: | |
367 | disp1 = get_displacement (buffer, aoffsetp); | |
368 | sprintf (result, "@|%d|", disp1); | |
369 | break; | |
370 | case 0x16: | |
371 | disp1 = get_displacement (buffer, aoffsetp); | |
372 | disp2 = get_displacement (buffer, aoffsetp); | |
373 | sprintf (result, "EXT(%d) + %d", disp1, disp2); | |
374 | break; | |
375 | case 0x17: | |
376 | sprintf (result, "tos"); | |
377 | break; | |
378 | case 0x18: | |
379 | disp1 = get_displacement (buffer, aoffsetp); | |
380 | sprintf (result, "%d(fp)", disp1); | |
381 | break; | |
382 | case 0x19: | |
383 | disp1 = get_displacement (buffer, aoffsetp); | |
384 | sprintf (result, "%d(sp)", disp1); | |
385 | break; | |
386 | case 0x1a: | |
387 | disp1 = get_displacement (buffer, aoffsetp); | |
388 | sprintf (result, "%d(sb)", disp1); | |
389 | break; | |
390 | case 0x1b: | |
391 | disp1 = get_displacement (buffer, aoffsetp); | |
392 | sprintf (result, "|%d|", addr + disp1); | |
393 | break; | |
394 | case 0x1c: | |
395 | case 0x1d: | |
396 | case 0x1e: | |
397 | case 0x1f: | |
398 | index = bit_extract (buffer, index_offset - 8, 3); | |
399 | print_insn_arg (d, index_offset, aoffsetp, buffer, addr, | |
400 | result, 0); | |
401 | { | |
402 | static char *ind[] = {"b", "w", "d", "q"}; | |
403 | char *off; | |
404 | ||
405 | off = result + strlen (result); | |
406 | sprintf (off, "[r%d:%s]", index, | |
407 | ind[addr_mode & 3]); | |
408 | } | |
409 | break; | |
410 | } | |
411 | break; | |
412 | case 'q': | |
413 | Ivalue = bit_extract (buffer, ioffset-4, 4); | |
414 | Ivalue = sign_extend (Ivalue, 4); | |
415 | sprintf (result, "%d", Ivalue); | |
416 | ioffset -= 4; | |
417 | break; | |
418 | case 'r': | |
419 | Ivalue = bit_extract (buffer, ioffset-3, 3); | |
420 | sprintf (result, "r%d", Ivalue&7); | |
421 | ioffset -= 3; | |
422 | break; | |
423 | case 'd': | |
424 | sprintf (result, "%d", get_displacement (buffer, aoffsetp)); | |
425 | break; | |
426 | case 'p': | |
427 | sprintf (result, "%c%d%c", NEXT_IS_ADDR, | |
428 | addr + get_displacement (buffer, aoffsetp), | |
429 | NEXT_IS_ADDR); | |
430 | break; | |
431 | case 'i': | |
432 | Ivalue = bit_extract (buffer, *aoffsetp, 8); | |
433 | *aoffsetp += 8; | |
434 | sprintf (result, "0x%x", Ivalue); | |
435 | break; | |
436 | } | |
437 | return ioffset; | |
438 | } | |
439 | ||
440 | get_displacement (buffer, aoffsetp) | |
441 | char *buffer; | |
442 | int *aoffsetp; | |
443 | { | |
444 | int Ivalue; | |
445 | ||
446 | Ivalue = bit_extract (buffer, *aoffsetp, 8); | |
447 | switch (Ivalue & 0xc0) | |
448 | { | |
449 | case 0x00: | |
450 | case 0x40: | |
451 | Ivalue = sign_extend (Ivalue, 7); | |
452 | *aoffsetp += 8; | |
453 | break; | |
454 | case 0x80: | |
455 | Ivalue = bit_extract (buffer, *aoffsetp, 16); | |
456 | flip_bytes (&Ivalue, 2); | |
457 | Ivalue = sign_extend (Ivalue, 14); | |
458 | *aoffsetp += 16; | |
459 | break; | |
460 | case 0xc0: | |
461 | Ivalue = bit_extract (buffer, *aoffsetp, 32); | |
462 | flip_bytes (&Ivalue, 4); | |
463 | Ivalue = sign_extend (Ivalue, 30); | |
464 | *aoffsetp += 32; | |
465 | break; | |
466 | } | |
467 | return Ivalue; | |
468 | } | |
469 | \f | |
470 | /* Return the number of locals in the current frame given a pc | |
471 | pointing to the enter instruction. This is used in the macro | |
472 | FRAME_FIND_SAVED_REGS. */ | |
473 | ||
474 | ns32k_localcount (enter_pc) | |
475 | CORE_ADDR enter_pc; | |
476 | { | |
477 | unsigned char localtype; | |
478 | int localcount; | |
479 | ||
480 | localtype = read_memory_integer (enter_pc+2, 1); | |
481 | if ((localtype & 0x80) == 0) | |
482 | localcount = localtype; | |
483 | else if ((localtype & 0xc0) == 0x80) | |
484 | localcount = (((localtype & 0x3f) << 8) | |
485 | | (read_memory_integer (enter_pc+3, 1) & 0xff)); | |
486 | else | |
487 | localcount = (((localtype & 0x3f) << 24) | |
488 | | ((read_memory_integer (enter_pc+3, 1) & 0xff) << 16) | |
489 | | ((read_memory_integer (enter_pc+4, 1) & 0xff) << 8 ) | |
490 | | (read_memory_integer (enter_pc+5, 1) & 0xff)); | |
491 | return localcount; | |
492 | } | |
493 | ||
494 | /* | |
495 | * Get the address of the enter opcode for the function | |
496 | * containing PC, if there is an enter for the function, | |
497 | * and if the pc is between the enter and exit. | |
498 | * Returns positive address if pc is between enter/exit, | |
499 | * 1 if pc before enter or after exit, 0 otherwise. | |
500 | */ | |
501 | ||
502 | CORE_ADDR | |
503 | ns32k_get_enter_addr (pc) | |
504 | CORE_ADDR pc; | |
505 | { | |
506 | CORE_ADDR enter_addr; | |
507 | unsigned char op; | |
508 | ||
509 | if (ABOUT_TO_RETURN (pc)) | |
510 | return 1; /* after exit */ | |
511 | ||
512 | enter_addr = get_pc_function_start (pc); | |
513 | ||
514 | if (pc == enter_addr) | |
515 | return 1; /* before enter */ | |
516 | ||
517 | op = read_memory_integer (enter_addr, 1); | |
518 | ||
519 | if (op != 0x82) | |
520 | return 0; /* function has no enter/exit */ | |
521 | ||
522 | return enter_addr; /* pc is between enter and exit */ | |
523 | } |