Commit | Line | Data |
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fb1415ae JG |
1 | /* Machine-dependent code which would otherwise be in inflow.c and core.c, |
2 | for GDB, the GNU debugger. This code is for the HP PA-RISC cpu. | |
3 | Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc. | |
4 | ||
5 | Contributed by the Center for Software Science at the | |
6 | University of Utah (pa-gdb-bugs@cs.utah.edu). | |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "value.h" | |
28 | ||
29 | /* For argument passing to the inferior */ | |
30 | #include "symtab.h" | |
31 | ||
32 | #ifdef USG | |
33 | #include <sys/types.h> | |
34 | #endif | |
35 | ||
36 | #include <sys/param.h> | |
37 | #include <sys/dir.h> | |
38 | #include <signal.h> | |
39 | #include <sys/ioctl.h> | |
40 | ||
41 | #ifdef COFF_ENCAPSULATE | |
42 | #include "a.out.encap.h" | |
43 | #else | |
44 | #include <a.out.h> | |
45 | #endif | |
46 | #ifndef N_SET_MAGIC | |
47 | #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val)) | |
48 | #endif | |
49 | ||
50 | /*#include <sys/user.h> After a.out.h */ | |
51 | #include <sys/file.h> | |
52 | #include <sys/stat.h> | |
fb1415ae | 53 | #include <machine/psl.h> |
9f739abd | 54 | #include "wait.h" |
fb1415ae JG |
55 | |
56 | #include "gdbcore.h" | |
57 | #include "gdbcmd.h" | |
9f739abd | 58 | #include "target.h" |
fb1415ae | 59 | |
fb1415ae | 60 | \f |
fb1415ae JG |
61 | /* Routines to extract various sized constants out of hppa |
62 | instructions. */ | |
63 | ||
64 | /* This assumes that no garbage lies outside of the lower bits of | |
65 | value. */ | |
66 | ||
67 | int | |
68 | sign_extend (val, bits) | |
69 | unsigned val, bits; | |
70 | { | |
71 | return (int)(val >> bits - 1 ? (-1 << bits) | val : val); | |
72 | } | |
73 | ||
74 | /* For many immediate values the sign bit is the low bit! */ | |
75 | ||
76 | int | |
77 | low_sign_extend (val, bits) | |
78 | unsigned val, bits; | |
79 | { | |
80 | return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1); | |
81 | } | |
82 | /* extract the immediate field from a ld{bhw}s instruction */ | |
83 | ||
fb1415ae JG |
84 | unsigned |
85 | get_field (val, from, to) | |
86 | unsigned val, from, to; | |
87 | { | |
88 | val = val >> 31 - to; | |
89 | return val & ((1 << 32 - from) - 1); | |
90 | } | |
91 | ||
92 | unsigned | |
93 | set_field (val, from, to, new_val) | |
94 | unsigned *val, from, to; | |
95 | { | |
96 | unsigned mask = ~((1 << (to - from + 1)) << (31 - from)); | |
97 | return *val = *val & mask | (new_val << (31 - from)); | |
98 | } | |
99 | ||
100 | /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */ | |
101 | ||
102 | extract_3 (word) | |
103 | unsigned word; | |
104 | { | |
105 | return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17); | |
106 | } | |
107 | ||
108 | extract_5_load (word) | |
109 | unsigned word; | |
110 | { | |
111 | return low_sign_extend (word >> 16 & MASK_5, 5); | |
112 | } | |
113 | ||
114 | /* extract the immediate field from a st{bhw}s instruction */ | |
115 | ||
116 | int | |
117 | extract_5_store (word) | |
118 | unsigned word; | |
119 | { | |
120 | return low_sign_extend (word & MASK_5, 5); | |
121 | } | |
122 | ||
123 | /* extract an 11 bit immediate field */ | |
124 | ||
125 | int | |
126 | extract_11 (word) | |
127 | unsigned word; | |
128 | { | |
129 | return low_sign_extend (word & MASK_11, 11); | |
130 | } | |
131 | ||
132 | /* extract a 14 bit immediate field */ | |
133 | ||
134 | int | |
135 | extract_14 (word) | |
136 | unsigned word; | |
137 | { | |
138 | return low_sign_extend (word & MASK_14, 14); | |
139 | } | |
140 | ||
141 | /* deposit a 14 bit constant in a word */ | |
142 | ||
143 | unsigned | |
144 | deposit_14 (opnd, word) | |
145 | int opnd; | |
146 | unsigned word; | |
147 | { | |
148 | unsigned sign = (opnd < 0 ? 1 : 0); | |
149 | ||
150 | return word | ((unsigned)opnd << 1 & MASK_14) | sign; | |
151 | } | |
152 | ||
153 | /* extract a 21 bit constant */ | |
154 | ||
155 | int | |
156 | extract_21 (word) | |
157 | unsigned word; | |
158 | { | |
159 | int val; | |
160 | ||
161 | word &= MASK_21; | |
162 | word <<= 11; | |
163 | val = GET_FIELD (word, 20, 20); | |
164 | val <<= 11; | |
165 | val |= GET_FIELD (word, 9, 19); | |
166 | val <<= 2; | |
167 | val |= GET_FIELD (word, 5, 6); | |
168 | val <<= 5; | |
169 | val |= GET_FIELD (word, 0, 4); | |
170 | val <<= 2; | |
171 | val |= GET_FIELD (word, 7, 8); | |
172 | return sign_extend (val, 21) << 11; | |
173 | } | |
174 | ||
175 | /* deposit a 21 bit constant in a word. Although 21 bit constants are | |
176 | usually the top 21 bits of a 32 bit constant, we assume that only | |
177 | the low 21 bits of opnd are relevant */ | |
178 | ||
179 | unsigned | |
180 | deposit_21 (opnd, word) | |
181 | unsigned opnd, word; | |
182 | { | |
183 | unsigned val = 0; | |
184 | ||
185 | val |= GET_FIELD (opnd, 11 + 14, 11 + 18); | |
186 | val <<= 2; | |
187 | val |= GET_FIELD (opnd, 11 + 12, 11 + 13); | |
188 | val <<= 2; | |
189 | val |= GET_FIELD (opnd, 11 + 19, 11 + 20); | |
190 | val <<= 11; | |
191 | val |= GET_FIELD (opnd, 11 + 1, 11 + 11); | |
192 | val <<= 1; | |
193 | val |= GET_FIELD (opnd, 11 + 0, 11 + 0); | |
194 | return word | val; | |
195 | } | |
196 | ||
197 | /* extract a 12 bit constant from branch instructions */ | |
198 | ||
199 | int | |
200 | extract_12 (word) | |
201 | unsigned word; | |
202 | { | |
203 | return sign_extend (GET_FIELD (word, 19, 28) | | |
204 | GET_FIELD (word, 29, 29) << 10 | | |
205 | (word & 0x1) << 11, 12) << 2; | |
206 | } | |
207 | ||
208 | /* extract a 17 bit constant from branch instructions, returning the | |
209 | 19 bit signed value. */ | |
210 | ||
211 | int | |
212 | extract_17 (word) | |
213 | unsigned word; | |
214 | { | |
215 | return sign_extend (GET_FIELD (word, 19, 28) | | |
216 | GET_FIELD (word, 29, 29) << 10 | | |
217 | GET_FIELD (word, 11, 15) << 11 | | |
218 | (word & 0x1) << 16, 17) << 2; | |
219 | } | |
9f739abd | 220 | \f |
b5c10493 SG |
221 | int use_unwind = 0; |
222 | ||
223 | static struct unwind_table_entry * | |
224 | find_unwind_entry(pc) | |
225 | CORE_ADDR pc; | |
226 | { | |
0213d96f SG |
227 | static struct unwind_table_entry *unwind = NULL; |
228 | static int unwind_last; | |
229 | static int unwind_cache = -1; | |
230 | int first, middle, last; | |
b5c10493 SG |
231 | |
232 | if (!unwind) | |
233 | { | |
234 | asection *unwind_sec; | |
235 | ||
236 | unwind_sec = bfd_get_section_by_name (exec_bfd, "$UNWIND_START$"); | |
237 | if (unwind_sec) | |
238 | { | |
239 | int size; | |
240 | ||
241 | size = bfd_section_size (exec_bfd, unwind_sec); | |
242 | unwind = malloc (size); | |
0213d96f | 243 | unwind_last = size / sizeof (struct unwind_table_entry) - 1; |
b5c10493 SG |
244 | |
245 | bfd_get_section_contents (exec_bfd, unwind_sec, unwind, 0, size); | |
246 | } | |
247 | } | |
248 | ||
0213d96f SG |
249 | if (unwind_cache > 0 |
250 | && pc >= unwind[unwind_cache].region_start | |
251 | && pc <= unwind[unwind_cache].region_end) | |
252 | return &unwind[unwind_cache]; | |
253 | ||
254 | first = 0; | |
255 | last = unwind_last; | |
256 | ||
257 | while (first <= last) | |
b5c10493 | 258 | { |
0213d96f SG |
259 | middle = (first + last) / 2; |
260 | if (pc >= unwind[middle].region_start | |
261 | && pc <= unwind[middle].region_end) | |
262 | return &unwind[middle]; | |
263 | ||
264 | if (pc < unwind[middle].region_start) | |
265 | last = middle - 1; | |
266 | else | |
267 | first = middle + 1; | |
b5c10493 | 268 | } |
0213d96f | 269 | return NULL; |
b5c10493 SG |
270 | } |
271 | ||
272 | static int | |
273 | find_return_regnum(pc) | |
274 | CORE_ADDR pc; | |
275 | { | |
276 | struct unwind_table_entry *u; | |
277 | ||
278 | u = find_unwind_entry (pc); | |
279 | ||
280 | if (!u) | |
281 | return RP_REGNUM; | |
282 | ||
283 | if (u->Millicode) | |
284 | return 31; | |
285 | ||
286 | return RP_REGNUM; | |
287 | } | |
288 | ||
289 | int | |
290 | find_proc_framesize(pc) | |
291 | CORE_ADDR pc; | |
292 | { | |
293 | struct unwind_table_entry *u; | |
294 | ||
0213d96f SG |
295 | if (!use_unwind) |
296 | return -1; | |
297 | ||
b5c10493 SG |
298 | u = find_unwind_entry (pc); |
299 | ||
300 | if (!u) | |
301 | return -1; | |
302 | ||
303 | return u->Total_frame_size << 3; | |
304 | } | |
0213d96f SG |
305 | |
306 | int | |
307 | rp_saved(pc) | |
308 | { | |
309 | struct unwind_table_entry *u; | |
310 | ||
311 | u = find_unwind_entry (pc); | |
312 | ||
313 | if (!u) | |
314 | return 0; | |
315 | ||
316 | if (u->Save_RP) | |
317 | return 1; | |
318 | else | |
319 | return 0; | |
320 | } | |
b5c10493 SG |
321 | \f |
322 | CORE_ADDR | |
323 | saved_pc_after_call (frame) | |
324 | FRAME frame; | |
325 | { | |
326 | int ret_regnum; | |
327 | ||
328 | ret_regnum = find_return_regnum (get_frame_pc (frame)); | |
329 | ||
330 | return read_register (ret_regnum) & ~0x3; | |
331 | } | |
332 | \f | |
fb1415ae JG |
333 | CORE_ADDR |
334 | frame_saved_pc (frame) | |
335 | FRAME frame; | |
336 | { | |
0213d96f SG |
337 | CORE_ADDR pc = get_frame_pc (frame); |
338 | ||
339 | if (frameless_look_for_prologue (frame)) | |
fb1415ae | 340 | { |
b5c10493 SG |
341 | int ret_regnum; |
342 | ||
343 | ret_regnum = find_return_regnum (pc); | |
344 | ||
345 | return read_register (ret_regnum) & ~0x3; | |
fb1415ae | 346 | } |
0213d96f SG |
347 | else if (rp_saved (pc)) |
348 | return read_memory_integer (frame->frame - 20, 4) & ~0x3; | |
349 | else | |
350 | return read_register (RP_REGNUM) & ~0x3; | |
fb1415ae | 351 | } |
b5c10493 SG |
352 | \f |
353 | /* We need to correct the PC and the FP for the outermost frame when we are | |
354 | in a system call. */ | |
355 | ||
356 | void | |
357 | init_extra_frame_info (fromleaf, frame) | |
358 | int fromleaf; | |
359 | struct frame_info *frame; | |
360 | { | |
361 | int flags; | |
362 | int framesize; | |
363 | ||
364 | if (frame->next) /* Only do this for outermost frame */ | |
365 | return; | |
fb1415ae | 366 | |
b5c10493 SG |
367 | flags = read_register (FLAGS_REGNUM); |
368 | if (flags & 2) /* In system call? */ | |
369 | frame->pc = read_register (31) & ~0x3; | |
370 | ||
371 | /* The outermost frame is always derived from PC-framesize */ | |
372 | framesize = find_proc_framesize(frame->pc); | |
373 | if (framesize == -1) | |
374 | frame->frame = read_register (FP_REGNUM); | |
375 | else | |
376 | frame->frame = read_register (SP_REGNUM) - framesize; | |
377 | ||
0213d96f SG |
378 | if (!frameless_look_for_prologue (frame)) /* Frameless? */ |
379 | return; /* No, quit now */ | |
b5c10493 SG |
380 | |
381 | /* For frameless functions, we need to look at the caller's frame */ | |
382 | framesize = find_proc_framesize(FRAME_SAVED_PC(frame)); | |
383 | if (framesize != -1) | |
384 | frame->frame -= framesize; | |
385 | } | |
386 | \f | |
387 | FRAME_ADDR | |
388 | frame_chain (frame) | |
389 | struct frame_info *frame; | |
390 | { | |
391 | int framesize; | |
392 | ||
393 | framesize = find_proc_framesize(FRAME_SAVED_PC(frame)); | |
394 | ||
395 | if (framesize != -1) | |
396 | return frame->frame - framesize; | |
397 | ||
398 | return read_memory_integer (frame->frame, 4); | |
399 | } | |
400 | \f | |
fb1415ae JG |
401 | /* To see if a frame chain is valid, see if the caller looks like it |
402 | was compiled with gcc. */ | |
403 | ||
0213d96f SG |
404 | int |
405 | frame_chain_valid (chain, thisframe) | |
fb1415ae JG |
406 | FRAME_ADDR chain; |
407 | FRAME thisframe; | |
408 | { | |
0213d96f SG |
409 | struct minimal_symbol *msym; |
410 | ||
411 | if (!chain) | |
fb1415ae | 412 | return 0; |
0213d96f SG |
413 | |
414 | msym = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); | |
415 | ||
416 | if (msym | |
417 | && (strcmp (SYMBOL_NAME (msym), "_start") == 0)) | |
418 | return 0; | |
419 | else | |
420 | return 1; | |
fb1415ae JG |
421 | } |
422 | ||
0213d96f | 423 | #if 0 |
fb1415ae JG |
424 | /* Some helper functions. gcc_p returns 1 if the function beginning at |
425 | pc appears to have been compiled with gcc. hpux_cc_p returns 1 if | |
426 | fn was compiled with hpux cc. gcc functions look like : | |
427 | ||
428 | stw rp,-0x14(sp) ; optional | |
429 | or r4,r0,r1 | |
430 | or sp,r0,r4 | |
431 | stwm r1,framesize(sp) | |
432 | ||
433 | hpux cc functions look like: | |
434 | ||
435 | stw rp,-0x14(sp) ; optional. | |
436 | stwm r3,framesiz(sp) | |
437 | */ | |
438 | ||
439 | gcc_p (pc) | |
440 | CORE_ADDR pc; | |
441 | { | |
442 | if (read_memory_integer (pc, 4) == 0x6BC23FD9) | |
443 | pc = pc + 4; | |
444 | ||
0213d96f SG |
445 | if (read_memory_integer (pc, 4) == 0x8040241 |
446 | && read_memory_integer (pc + 4, 4) == 0x81E0244) | |
fb1415ae JG |
447 | return 1; |
448 | return 0; | |
449 | } | |
0213d96f | 450 | #endif |
fb1415ae | 451 | |
9f739abd SG |
452 | /* |
453 | * These functions deal with saving and restoring register state | |
454 | * around a function call in the inferior. They keep the stack | |
455 | * double-word aligned; eventually, on an hp700, the stack will have | |
456 | * to be aligned to a 64-byte boundary. | |
457 | */ | |
458 | ||
459 | int | |
460 | push_dummy_frame () | |
461 | { | |
0213d96f | 462 | register CORE_ADDR sp; |
9f739abd SG |
463 | register int regnum; |
464 | int int_buffer; | |
465 | double freg_buffer; | |
0213d96f | 466 | |
9f739abd | 467 | /* Space for "arguments"; the RP goes in here. */ |
0213d96f | 468 | sp = read_register (SP_REGNUM) + 48; |
9f739abd SG |
469 | int_buffer = read_register (RP_REGNUM) | 0x3; |
470 | write_memory (sp - 20, (char *)&int_buffer, 4); | |
0213d96f | 471 | |
9f739abd SG |
472 | int_buffer = read_register (FP_REGNUM); |
473 | write_memory (sp, (char *)&int_buffer, 4); | |
0213d96f | 474 | |
9f739abd | 475 | write_register (FP_REGNUM, sp); |
0213d96f | 476 | |
9f739abd | 477 | sp += 8; |
0213d96f | 478 | |
9f739abd SG |
479 | for (regnum = 1; regnum < 32; regnum++) |
480 | if (regnum != RP_REGNUM && regnum != FP_REGNUM) | |
481 | sp = push_word (sp, read_register (regnum)); | |
0213d96f | 482 | |
9f739abd | 483 | sp += 4; |
0213d96f | 484 | |
9f739abd | 485 | for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) |
0213d96f SG |
486 | { |
487 | read_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); | |
488 | sp = push_bytes (sp, (char *)&freg_buffer, 8); | |
489 | } | |
9f739abd SG |
490 | sp = push_word (sp, read_register (IPSW_REGNUM)); |
491 | sp = push_word (sp, read_register (SAR_REGNUM)); | |
492 | sp = push_word (sp, read_register (PCOQ_HEAD_REGNUM)); | |
493 | sp = push_word (sp, read_register (PCSQ_HEAD_REGNUM)); | |
494 | sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM)); | |
495 | sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM)); | |
496 | write_register (SP_REGNUM, sp); | |
497 | } | |
498 | ||
fb1415ae JG |
499 | find_dummy_frame_regs (frame, frame_saved_regs) |
500 | struct frame_info *frame; | |
501 | struct frame_saved_regs *frame_saved_regs; | |
502 | { | |
503 | CORE_ADDR fp = frame->frame; | |
504 | int i; | |
9f739abd | 505 | |
fb1415ae JG |
506 | frame_saved_regs->regs[RP_REGNUM] = fp - 20 & ~0x3; |
507 | frame_saved_regs->regs[FP_REGNUM] = fp; | |
508 | frame_saved_regs->regs[1] = fp + 8; | |
509 | frame_saved_regs->regs[3] = fp + 12; | |
0213d96f | 510 | |
9f739abd | 511 | for (fp += 16, i = 5; i < 32; fp += 4, i++) |
fb1415ae | 512 | frame_saved_regs->regs[i] = fp; |
0213d96f | 513 | |
fb1415ae JG |
514 | fp += 4; |
515 | for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8) | |
516 | frame_saved_regs->regs[i] = fp; | |
0213d96f SG |
517 | |
518 | frame_saved_regs->regs[IPSW_REGNUM] = fp; | |
519 | fp += 4; | |
520 | frame_saved_regs->regs[SAR_REGNUM] = fp; | |
521 | fp += 4; | |
522 | frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp; | |
523 | fp +=4; | |
524 | frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp; | |
525 | fp +=4; | |
526 | frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp; | |
527 | fp +=4; | |
fb1415ae JG |
528 | frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp; |
529 | } | |
530 | ||
9f739abd SG |
531 | int |
532 | hp_pop_frame () | |
533 | { | |
534 | register FRAME frame = get_current_frame (); | |
535 | register CORE_ADDR fp; | |
536 | register int regnum; | |
537 | struct frame_saved_regs fsr; | |
538 | struct frame_info *fi; | |
539 | double freg_buffer; | |
0213d96f | 540 | |
9f739abd SG |
541 | fi = get_frame_info (frame); |
542 | fp = fi->frame; | |
543 | get_frame_saved_regs (fi, &fsr); | |
0213d96f | 544 | |
9f739abd SG |
545 | if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */ |
546 | hp_restore_pc_queue (&fsr); | |
0213d96f | 547 | |
9f739abd SG |
548 | for (regnum = 31; regnum > 0; regnum--) |
549 | if (fsr.regs[regnum]) | |
550 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); | |
0213d96f | 551 | |
9f739abd SG |
552 | for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--) |
553 | if (fsr.regs[regnum]) | |
0213d96f SG |
554 | { |
555 | read_memory (fsr.regs[regnum], (char *)&freg_buffer, 8); | |
9f739abd SG |
556 | write_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); |
557 | } | |
0213d96f | 558 | |
9f739abd SG |
559 | if (fsr.regs[IPSW_REGNUM]) |
560 | write_register (IPSW_REGNUM, | |
561 | read_memory_integer (fsr.regs[IPSW_REGNUM], 4)); | |
0213d96f | 562 | |
9f739abd SG |
563 | if (fsr.regs[SAR_REGNUM]) |
564 | write_register (SAR_REGNUM, | |
565 | read_memory_integer (fsr.regs[SAR_REGNUM], 4)); | |
0213d96f | 566 | |
9f739abd SG |
567 | if (fsr.regs[PCOQ_TAIL_REGNUM]) |
568 | write_register (PCOQ_TAIL_REGNUM, | |
569 | read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4)); | |
0213d96f | 570 | |
9f739abd | 571 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); |
0213d96f | 572 | |
9f739abd SG |
573 | if (fsr.regs[IPSW_REGNUM]) /* call dummy */ |
574 | write_register (SP_REGNUM, fp - 48); | |
575 | else | |
576 | write_register (SP_REGNUM, fp); | |
0213d96f | 577 | |
9f739abd SG |
578 | flush_cached_frames (); |
579 | set_current_frame (create_new_frame (read_register (FP_REGNUM), | |
580 | read_pc ())); | |
581 | } | |
582 | ||
583 | /* | |
584 | * After returning to a dummy on the stack, restore the instruction | |
585 | * queue space registers. */ | |
586 | ||
587 | int | |
588 | hp_restore_pc_queue (fsr) | |
589 | struct frame_saved_regs *fsr; | |
590 | { | |
591 | CORE_ADDR pc = read_pc (); | |
592 | CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4); | |
593 | int pid; | |
594 | WAITTYPE w; | |
595 | int insn_count; | |
596 | ||
597 | /* Advance past break instruction in the call dummy. */ | |
0213d96f SG |
598 | write_register (PCOQ_HEAD_REGNUM, pc + 4); |
599 | write_register (PCOQ_TAIL_REGNUM, pc + 8); | |
9f739abd SG |
600 | |
601 | /* | |
602 | * HPUX doesn't let us set the space registers or the space | |
603 | * registers of the PC queue through ptrace. Boo, hiss. | |
604 | * Conveniently, the call dummy has this sequence of instructions | |
605 | * after the break: | |
606 | * mtsp r21, sr0 | |
607 | * ble,n 0(sr0, r22) | |
608 | * | |
609 | * So, load up the registers and single step until we are in the | |
610 | * right place. | |
611 | */ | |
612 | ||
613 | write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4)); | |
614 | write_register (22, new_pc); | |
615 | ||
616 | for (insn_count = 0; insn_count < 3; insn_count++) | |
617 | { | |
618 | resume (1, 0); | |
619 | target_wait(&w); | |
620 | ||
621 | if (!WIFSTOPPED (w)) | |
622 | { | |
623 | stop_signal = WTERMSIG (w); | |
624 | terminal_ours_for_output (); | |
625 | printf ("\nProgram terminated with signal %d, %s\n", | |
626 | stop_signal, safe_strsignal (stop_signal)); | |
627 | fflush (stdout); | |
628 | return 0; | |
629 | } | |
630 | } | |
631 | fetch_inferior_registers (-1); | |
632 | return 1; | |
633 | } | |
634 | ||
fb1415ae JG |
635 | CORE_ADDR |
636 | hp_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
637 | int nargs; | |
638 | value *args; | |
639 | CORE_ADDR sp; | |
640 | int struct_return; | |
641 | CORE_ADDR struct_addr; | |
642 | { | |
643 | /* array of arguments' offsets */ | |
644 | int *offset = (int *)alloca(nargs); | |
645 | int cum = 0; | |
646 | int i, alignment; | |
647 | ||
648 | for (i = 0; i < nargs; i++) | |
649 | { | |
650 | cum += TYPE_LENGTH (VALUE_TYPE (args[i])); | |
0213d96f SG |
651 | |
652 | /* value must go at proper alignment. Assume alignment is a | |
fb1415ae JG |
653 | power of two.*/ |
654 | alignment = hp_alignof (VALUE_TYPE (args[i])); | |
655 | if (cum % alignment) | |
656 | cum = (cum + alignment) & -alignment; | |
657 | offset[i] = -cum; | |
658 | } | |
9f739abd | 659 | sp += min ((cum + 7) & -8, 16); |
0213d96f | 660 | |
9f739abd | 661 | for (i = 0; i < nargs; i++) |
0213d96f SG |
662 | write_memory (sp + offset[i], VALUE_CONTENTS (args[i]), |
663 | TYPE_LENGTH (VALUE_TYPE (args[i]))); | |
664 | ||
fb1415ae JG |
665 | if (struct_return) |
666 | write_register (28, struct_addr); | |
9f739abd | 667 | return sp + 32; |
fb1415ae JG |
668 | } |
669 | ||
670 | /* return the alignment of a type in bytes. Structures have the maximum | |
671 | alignment required by their fields. */ | |
672 | ||
673 | int | |
674 | hp_alignof (arg) | |
675 | struct type *arg; | |
676 | { | |
677 | int max_align, align, i; | |
678 | switch (TYPE_CODE (arg)) | |
679 | { | |
680 | case TYPE_CODE_PTR: | |
681 | case TYPE_CODE_INT: | |
682 | case TYPE_CODE_FLT: | |
683 | return TYPE_LENGTH (arg); | |
684 | case TYPE_CODE_ARRAY: | |
685 | return hp_alignof (TYPE_FIELD_TYPE (arg, 0)); | |
686 | case TYPE_CODE_STRUCT: | |
687 | case TYPE_CODE_UNION: | |
688 | max_align = 2; | |
689 | for (i = 0; i < TYPE_NFIELDS (arg); i++) | |
690 | { | |
691 | /* Bit fields have no real alignment. */ | |
692 | if (!TYPE_FIELD_BITPOS (arg, i)) | |
693 | { | |
694 | align = hp_alignof (TYPE_FIELD_TYPE (arg, i)); | |
695 | max_align = max (max_align, align); | |
696 | } | |
697 | } | |
698 | return max_align; | |
699 | default: | |
700 | return 4; | |
701 | } | |
702 | } | |
703 | ||
704 | /* Print the register regnum, or all registers if regnum is -1 */ | |
705 | ||
706 | pa_do_registers_info (regnum, fpregs) | |
707 | int regnum; | |
708 | int fpregs; | |
709 | { | |
710 | char raw_regs [REGISTER_BYTES]; | |
711 | int i; | |
712 | ||
713 | for (i = 0; i < NUM_REGS; i++) | |
714 | read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); | |
9f739abd SG |
715 | if (regnum == -1) |
716 | pa_print_registers (raw_regs, regnum, fpregs); | |
fb1415ae | 717 | else if (regnum < FP0_REGNUM) |
0213d96f SG |
718 | printf ("%s %x\n", reg_names[regnum], *(long *)(raw_regs + |
719 | REGISTER_BYTE (regnum))); | |
fb1415ae JG |
720 | else |
721 | pa_print_fp_reg (regnum); | |
722 | } | |
723 | ||
9f739abd | 724 | pa_print_registers (raw_regs, regnum, fpregs) |
fb1415ae JG |
725 | char *raw_regs; |
726 | int regnum; | |
9f739abd | 727 | int fpregs; |
fb1415ae JG |
728 | { |
729 | int i; | |
730 | ||
731 | for (i = 0; i < 18; i++) | |
732 | printf ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n", | |
0213d96f SG |
733 | reg_names[i], |
734 | *(int *)(raw_regs + REGISTER_BYTE (i)), | |
735 | reg_names[i + 18], | |
736 | *(int *)(raw_regs + REGISTER_BYTE (i + 18)), | |
737 | reg_names[i + 36], | |
738 | *(int *)(raw_regs + REGISTER_BYTE (i + 36)), | |
739 | reg_names[i + 54], | |
740 | *(int *)(raw_regs + REGISTER_BYTE (i + 54))); | |
9f739abd SG |
741 | |
742 | if (fpregs) | |
743 | for (i = 72; i < NUM_REGS; i++) | |
744 | pa_print_fp_reg (i); | |
fb1415ae JG |
745 | } |
746 | ||
747 | pa_print_fp_reg (i) | |
748 | int i; | |
749 | { | |
750 | unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
751 | unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
752 | REGISTER_TYPE val; | |
753 | ||
754 | /* Get the data in raw format, then convert also to virtual format. */ | |
755 | read_relative_register_raw_bytes (i, raw_buffer); | |
756 | REGISTER_CONVERT_TO_VIRTUAL (i, raw_buffer, virtual_buffer); | |
757 | ||
758 | fputs_filtered (reg_names[i], stdout); | |
759 | print_spaces_filtered (15 - strlen (reg_names[i]), stdout); | |
760 | ||
761 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, stdout, 0, | |
762 | 1, 0, Val_pretty_default); | |
763 | printf_filtered ("\n"); | |
fb1415ae JG |
764 | } |
765 | ||
9f739abd SG |
766 | /* Function calls that pass into a new compilation unit must pass through a |
767 | small piece of code that does long format (`external' in HPPA parlance) | |
768 | jumps. We figure out where the trampoline is going to end up, and return | |
769 | the PC of the final destination. If we aren't in a trampoline, we just | |
b5c10493 SG |
770 | return NULL. |
771 | ||
772 | For computed calls, we just extract the new PC from r22. */ | |
fb1415ae | 773 | |
9f739abd | 774 | CORE_ADDR |
b5c10493 | 775 | skip_trampoline_code (pc, name) |
9f739abd | 776 | CORE_ADDR pc; |
b5c10493 | 777 | char *name; |
fb1415ae | 778 | { |
9f739abd | 779 | long inst0, inst1; |
b5c10493 SG |
780 | static CORE_ADDR dyncall = 0; |
781 | struct minimal_symbol *msym; | |
782 | ||
783 | /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */ | |
784 | ||
785 | if (!dyncall) | |
786 | { | |
787 | msym = lookup_minimal_symbol ("$$dyncall", NULL); | |
788 | if (msym) | |
b8ef8163 | 789 | dyncall = SYMBOL_VALUE_ADDRESS (msym); |
b5c10493 SG |
790 | else |
791 | dyncall = -1; | |
792 | } | |
793 | ||
794 | if (pc == dyncall) | |
795 | return (CORE_ADDR)(read_register (22) & ~0x3); | |
fb1415ae | 796 | |
9f739abd SG |
797 | inst0 = read_memory_integer (pc, 4); |
798 | inst1 = read_memory_integer (pc+4, 4); | |
fb1415ae | 799 | |
9f739abd SG |
800 | if ( (inst0 & 0xffe00000) == 0x20200000 /* ldil xxx, r1 */ |
801 | && (inst1 & 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */ | |
802 | pc = extract_21 (inst0) + extract_17 (inst1); | |
803 | else | |
b5c10493 | 804 | pc = (CORE_ADDR)NULL; |
fb1415ae | 805 | |
9f739abd | 806 | return pc; |
fb1415ae | 807 | } |
b5c10493 | 808 | |
0213d96f SG |
809 | /* Advance PC across any function entry prologue instructions |
810 | to reach some "real" code. */ | |
811 | ||
812 | /* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp) | |
813 | for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */ | |
814 | ||
815 | CORE_ADDR | |
816 | skip_prologue(pc) | |
817 | CORE_ADDR pc; | |
818 | { | |
819 | int inst; | |
820 | int status; | |
821 | ||
822 | status = target_read_memory (pc, &inst, 4); | |
823 | SWAP_TARGET_AND_HOST (&inst, sizeof (inst)); | |
824 | if (status != 0) | |
825 | return pc; | |
826 | ||
827 | if (inst == 0x6BC23FD9) /* stw rp,-20(sp) */ | |
828 | { | |
829 | if (read_memory_integer (pc + 4, 4) == 0x8040241) /* copy r4,r1 */ | |
830 | pc += 16; | |
831 | else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */ | |
832 | pc += 8; | |
833 | } | |
834 | else if (read_memory_integer (pc, 4) == 0x8040241) /* copy r4,r1 */ | |
835 | pc += 12; | |
836 | else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */ | |
837 | pc += 4; | |
838 | ||
839 | return pc; | |
840 | } | |
841 | ||
b5c10493 SG |
842 | static void |
843 | unwind_command (exp, from_tty) | |
844 | char *exp; | |
845 | int from_tty; | |
846 | { | |
847 | CORE_ADDR address; | |
848 | union | |
849 | { | |
850 | int *foo; | |
851 | struct unwind_table_entry *u; | |
852 | } xxx; | |
853 | ||
854 | /* If we have an expression, evaluate it and use it as the address. */ | |
855 | ||
856 | if (exp != 0 && *exp != 0) | |
857 | address = parse_and_eval_address (exp); | |
858 | else | |
859 | return; | |
860 | ||
861 | xxx.u = find_unwind_entry (address); | |
862 | ||
863 | if (!xxx.u) | |
864 | { | |
865 | printf ("Can't find unwind table entry for PC 0x%x\n", address); | |
866 | return; | |
867 | } | |
868 | ||
869 | printf ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2], | |
870 | xxx.foo[3]); | |
871 | } | |
872 | ||
873 | void | |
874 | _initialize_hppah_tdep () | |
875 | { | |
876 | add_com ("unwind", class_obscure, unwind_command, "Print unwind info\n"); | |
877 | add_show_from_set | |
878 | (add_set_cmd ("use_unwind", class_obscure, var_boolean, | |
879 | (char *)&use_unwind, | |
b8ef8163 | 880 | "Set the usage of unwind info", &setlist), |
b5c10493 SG |
881 | &showlist); |
882 | } |