Commit | Line | Data |
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669caa9c SS |
1 | /* Target-dependent code for the HP PA architecture, for GDB. |
2 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994 | |
3 | Free Software Foundation, Inc. | |
66a1aa07 SG |
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> | |
66a1aa07 | 37 | #include <signal.h> |
66a1aa07 SG |
38 | |
39 | #ifdef COFF_ENCAPSULATE | |
40 | #include "a.out.encap.h" | |
41 | #else | |
66a1aa07 SG |
42 | #endif |
43 | #ifndef N_SET_MAGIC | |
44 | #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val)) | |
45 | #endif | |
46 | ||
47 | /*#include <sys/user.h> After a.out.h */ | |
48 | #include <sys/file.h> | |
49 | #include <sys/stat.h> | |
66a1aa07 SG |
50 | #include "wait.h" |
51 | ||
52 | #include "gdbcore.h" | |
53 | #include "gdbcmd.h" | |
54 | #include "target.h" | |
55 | #include "symfile.h" | |
56 | #include "objfiles.h" | |
57 | ||
669caa9c SS |
58 | static int restore_pc_queue PARAMS ((struct frame_saved_regs *)); |
59 | ||
60 | static int hppa_alignof PARAMS ((struct type *)); | |
61 | ||
62 | CORE_ADDR frame_saved_pc PARAMS ((struct frame_info *)); | |
63 | ||
c598654a | 64 | static int prologue_inst_adjust_sp PARAMS ((unsigned long)); |
669caa9c | 65 | |
c598654a | 66 | static int is_branch PARAMS ((unsigned long)); |
669caa9c | 67 | |
c598654a | 68 | static int inst_saves_gr PARAMS ((unsigned long)); |
669caa9c | 69 | |
c598654a | 70 | static int inst_saves_fr PARAMS ((unsigned long)); |
669caa9c | 71 | |
70e43abe | 72 | static int pc_in_interrupt_handler PARAMS ((CORE_ADDR)); |
669caa9c | 73 | |
70e43abe | 74 | static int pc_in_linker_stub PARAMS ((CORE_ADDR)); |
669caa9c SS |
75 | |
76 | static int compare_unwind_entries PARAMS ((const struct unwind_table_entry *, | |
f81eee9d | 77 | const struct unwind_table_entry *)); |
669caa9c | 78 | |
c5152d42 | 79 | static void read_unwind_info PARAMS ((struct objfile *)); |
669caa9c | 80 | |
c5152d42 JL |
81 | static void internalize_unwinds PARAMS ((struct objfile *, |
82 | struct unwind_table_entry *, | |
83 | asection *, unsigned int, | |
bfaef242 | 84 | unsigned int, CORE_ADDR)); |
66a1aa07 SG |
85 | |
86 | \f | |
87 | /* Routines to extract various sized constants out of hppa | |
88 | instructions. */ | |
89 | ||
90 | /* This assumes that no garbage lies outside of the lower bits of | |
91 | value. */ | |
92 | ||
93 | int | |
94 | sign_extend (val, bits) | |
95 | unsigned val, bits; | |
96 | { | |
97 | return (int)(val >> bits - 1 ? (-1 << bits) | val : val); | |
98 | } | |
99 | ||
100 | /* For many immediate values the sign bit is the low bit! */ | |
101 | ||
102 | int | |
103 | low_sign_extend (val, bits) | |
104 | unsigned val, bits; | |
105 | { | |
106 | return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1); | |
107 | } | |
108 | /* extract the immediate field from a ld{bhw}s instruction */ | |
109 | ||
110 | unsigned | |
111 | get_field (val, from, to) | |
112 | unsigned val, from, to; | |
113 | { | |
114 | val = val >> 31 - to; | |
115 | return val & ((1 << 32 - from) - 1); | |
116 | } | |
117 | ||
118 | unsigned | |
119 | set_field (val, from, to, new_val) | |
120 | unsigned *val, from, to; | |
121 | { | |
122 | unsigned mask = ~((1 << (to - from + 1)) << (31 - from)); | |
123 | return *val = *val & mask | (new_val << (31 - from)); | |
124 | } | |
125 | ||
126 | /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */ | |
127 | ||
128 | extract_3 (word) | |
129 | unsigned word; | |
130 | { | |
131 | return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17); | |
132 | } | |
133 | ||
134 | extract_5_load (word) | |
135 | unsigned word; | |
136 | { | |
137 | return low_sign_extend (word >> 16 & MASK_5, 5); | |
138 | } | |
139 | ||
140 | /* extract the immediate field from a st{bhw}s instruction */ | |
141 | ||
142 | int | |
143 | extract_5_store (word) | |
144 | unsigned word; | |
145 | { | |
146 | return low_sign_extend (word & MASK_5, 5); | |
147 | } | |
148 | ||
68c8d698 SG |
149 | /* extract the immediate field from a break instruction */ |
150 | ||
151 | unsigned | |
152 | extract_5r_store (word) | |
153 | unsigned word; | |
154 | { | |
155 | return (word & MASK_5); | |
156 | } | |
157 | ||
158 | /* extract the immediate field from a {sr}sm instruction */ | |
159 | ||
160 | unsigned | |
161 | extract_5R_store (word) | |
162 | unsigned word; | |
163 | { | |
164 | return (word >> 16 & MASK_5); | |
165 | } | |
166 | ||
66a1aa07 SG |
167 | /* extract an 11 bit immediate field */ |
168 | ||
169 | int | |
170 | extract_11 (word) | |
171 | unsigned word; | |
172 | { | |
173 | return low_sign_extend (word & MASK_11, 11); | |
174 | } | |
175 | ||
176 | /* extract a 14 bit immediate field */ | |
177 | ||
178 | int | |
179 | extract_14 (word) | |
180 | unsigned word; | |
181 | { | |
182 | return low_sign_extend (word & MASK_14, 14); | |
183 | } | |
184 | ||
185 | /* deposit a 14 bit constant in a word */ | |
186 | ||
187 | unsigned | |
188 | deposit_14 (opnd, word) | |
189 | int opnd; | |
190 | unsigned word; | |
191 | { | |
192 | unsigned sign = (opnd < 0 ? 1 : 0); | |
193 | ||
194 | return word | ((unsigned)opnd << 1 & MASK_14) | sign; | |
195 | } | |
196 | ||
197 | /* extract a 21 bit constant */ | |
198 | ||
199 | int | |
200 | extract_21 (word) | |
201 | unsigned word; | |
202 | { | |
203 | int val; | |
204 | ||
205 | word &= MASK_21; | |
206 | word <<= 11; | |
207 | val = GET_FIELD (word, 20, 20); | |
208 | val <<= 11; | |
209 | val |= GET_FIELD (word, 9, 19); | |
210 | val <<= 2; | |
211 | val |= GET_FIELD (word, 5, 6); | |
212 | val <<= 5; | |
213 | val |= GET_FIELD (word, 0, 4); | |
214 | val <<= 2; | |
215 | val |= GET_FIELD (word, 7, 8); | |
216 | return sign_extend (val, 21) << 11; | |
217 | } | |
218 | ||
219 | /* deposit a 21 bit constant in a word. Although 21 bit constants are | |
220 | usually the top 21 bits of a 32 bit constant, we assume that only | |
221 | the low 21 bits of opnd are relevant */ | |
222 | ||
223 | unsigned | |
224 | deposit_21 (opnd, word) | |
225 | unsigned opnd, word; | |
226 | { | |
227 | unsigned val = 0; | |
228 | ||
229 | val |= GET_FIELD (opnd, 11 + 14, 11 + 18); | |
230 | val <<= 2; | |
231 | val |= GET_FIELD (opnd, 11 + 12, 11 + 13); | |
232 | val <<= 2; | |
233 | val |= GET_FIELD (opnd, 11 + 19, 11 + 20); | |
234 | val <<= 11; | |
235 | val |= GET_FIELD (opnd, 11 + 1, 11 + 11); | |
236 | val <<= 1; | |
237 | val |= GET_FIELD (opnd, 11 + 0, 11 + 0); | |
238 | return word | val; | |
239 | } | |
240 | ||
241 | /* extract a 12 bit constant from branch instructions */ | |
242 | ||
243 | int | |
244 | extract_12 (word) | |
245 | unsigned word; | |
246 | { | |
247 | return sign_extend (GET_FIELD (word, 19, 28) | | |
248 | GET_FIELD (word, 29, 29) << 10 | | |
249 | (word & 0x1) << 11, 12) << 2; | |
250 | } | |
251 | ||
252 | /* extract a 17 bit constant from branch instructions, returning the | |
253 | 19 bit signed value. */ | |
254 | ||
255 | int | |
256 | extract_17 (word) | |
257 | unsigned word; | |
258 | { | |
259 | return sign_extend (GET_FIELD (word, 19, 28) | | |
260 | GET_FIELD (word, 29, 29) << 10 | | |
261 | GET_FIELD (word, 11, 15) << 11 | | |
262 | (word & 0x1) << 16, 17) << 2; | |
263 | } | |
264 | \f | |
c5152d42 JL |
265 | |
266 | /* Compare the start address for two unwind entries returning 1 if | |
267 | the first address is larger than the second, -1 if the second is | |
268 | larger than the first, and zero if they are equal. */ | |
269 | ||
270 | static int | |
271 | compare_unwind_entries (a, b) | |
f81eee9d JL |
272 | const struct unwind_table_entry *a; |
273 | const struct unwind_table_entry *b; | |
c5152d42 JL |
274 | { |
275 | if (a->region_start > b->region_start) | |
276 | return 1; | |
277 | else if (a->region_start < b->region_start) | |
278 | return -1; | |
279 | else | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static void | |
bfaef242 | 284 | internalize_unwinds (objfile, table, section, entries, size, text_offset) |
c5152d42 JL |
285 | struct objfile *objfile; |
286 | struct unwind_table_entry *table; | |
287 | asection *section; | |
288 | unsigned int entries, size; | |
bfaef242 | 289 | CORE_ADDR text_offset; |
c5152d42 JL |
290 | { |
291 | /* We will read the unwind entries into temporary memory, then | |
292 | fill in the actual unwind table. */ | |
293 | if (size > 0) | |
294 | { | |
295 | unsigned long tmp; | |
296 | unsigned i; | |
297 | char *buf = alloca (size); | |
298 | ||
299 | bfd_get_section_contents (objfile->obfd, section, buf, 0, size); | |
300 | ||
301 | /* Now internalize the information being careful to handle host/target | |
302 | endian issues. */ | |
303 | for (i = 0; i < entries; i++) | |
304 | { | |
305 | table[i].region_start = bfd_get_32 (objfile->obfd, | |
306 | (bfd_byte *)buf); | |
bfaef242 | 307 | table[i].region_start += text_offset; |
c5152d42 JL |
308 | buf += 4; |
309 | table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *)buf); | |
bfaef242 | 310 | table[i].region_end += text_offset; |
c5152d42 JL |
311 | buf += 4; |
312 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf); | |
313 | buf += 4; | |
314 | table[i].Cannot_unwind = (tmp >> 31) & 0x1;; | |
315 | table[i].Millicode = (tmp >> 30) & 0x1; | |
316 | table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1; | |
317 | table[i].Region_description = (tmp >> 27) & 0x3; | |
318 | table[i].reserved1 = (tmp >> 26) & 0x1; | |
319 | table[i].Entry_SR = (tmp >> 25) & 0x1; | |
320 | table[i].Entry_FR = (tmp >> 21) & 0xf; | |
321 | table[i].Entry_GR = (tmp >> 16) & 0x1f; | |
322 | table[i].Args_stored = (tmp >> 15) & 0x1; | |
323 | table[i].Variable_Frame = (tmp >> 14) & 0x1; | |
324 | table[i].Separate_Package_Body = (tmp >> 13) & 0x1; | |
325 | table[i].Frame_Extension_Millicode = (tmp >> 12 ) & 0x1; | |
326 | table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1; | |
327 | table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1; | |
328 | table[i].Ada_Region = (tmp >> 9) & 0x1; | |
329 | table[i].reserved2 = (tmp >> 5) & 0xf; | |
330 | table[i].Save_SP = (tmp >> 4) & 0x1; | |
331 | table[i].Save_RP = (tmp >> 3) & 0x1; | |
332 | table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1; | |
333 | table[i].extn_ptr_defined = (tmp >> 1) & 0x1; | |
334 | table[i].Cleanup_defined = tmp & 0x1; | |
335 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf); | |
336 | buf += 4; | |
337 | table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1; | |
338 | table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1; | |
339 | table[i].Large_frame = (tmp >> 29) & 0x1; | |
340 | table[i].reserved4 = (tmp >> 27) & 0x3; | |
341 | table[i].Total_frame_size = tmp & 0x7ffffff; | |
342 | } | |
343 | } | |
344 | } | |
345 | ||
346 | /* Read in the backtrace information stored in the `$UNWIND_START$' section of | |
347 | the object file. This info is used mainly by find_unwind_entry() to find | |
348 | out the stack frame size and frame pointer used by procedures. We put | |
349 | everything on the psymbol obstack in the objfile so that it automatically | |
350 | gets freed when the objfile is destroyed. */ | |
351 | ||
9c842e0c | 352 | static void |
c5152d42 JL |
353 | read_unwind_info (objfile) |
354 | struct objfile *objfile; | |
355 | { | |
356 | asection *unwind_sec, *elf_unwind_sec, *stub_unwind_sec; | |
357 | unsigned unwind_size, elf_unwind_size, stub_unwind_size, total_size; | |
358 | unsigned index, unwind_entries, elf_unwind_entries; | |
359 | unsigned stub_entries, total_entries; | |
bfaef242 | 360 | CORE_ADDR text_offset; |
c5152d42 JL |
361 | struct obj_unwind_info *ui; |
362 | ||
bfaef242 | 363 | text_offset = ANOFFSET (objfile->section_offsets, 0); |
c5152d42 JL |
364 | ui = obstack_alloc (&objfile->psymbol_obstack, |
365 | sizeof (struct obj_unwind_info)); | |
366 | ||
367 | ui->table = NULL; | |
368 | ui->cache = NULL; | |
369 | ui->last = -1; | |
370 | ||
371 | /* Get hooks to all unwind sections. Note there is no linker-stub unwind | |
372 | section in ELF at the moment. */ | |
373 | unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_START$"); | |
0fc27289 | 374 | elf_unwind_sec = bfd_get_section_by_name (objfile->obfd, ".PARISC.unwind"); |
c5152d42 JL |
375 | stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$"); |
376 | ||
377 | /* Get sizes and unwind counts for all sections. */ | |
378 | if (unwind_sec) | |
379 | { | |
380 | unwind_size = bfd_section_size (objfile->obfd, unwind_sec); | |
381 | unwind_entries = unwind_size / UNWIND_ENTRY_SIZE; | |
382 | } | |
383 | else | |
384 | { | |
385 | unwind_size = 0; | |
386 | unwind_entries = 0; | |
387 | } | |
388 | ||
389 | if (elf_unwind_sec) | |
390 | { | |
391 | elf_unwind_size = bfd_section_size (objfile->obfd, elf_unwind_sec); | |
392 | elf_unwind_entries = elf_unwind_size / UNWIND_ENTRY_SIZE; | |
393 | } | |
f55179cb JL |
394 | else |
395 | { | |
396 | elf_unwind_size = 0; | |
397 | elf_unwind_entries = 0; | |
398 | } | |
c5152d42 JL |
399 | |
400 | if (stub_unwind_sec) | |
401 | { | |
402 | stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec); | |
403 | stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE; | |
404 | } | |
405 | else | |
406 | { | |
407 | stub_unwind_size = 0; | |
408 | stub_entries = 0; | |
409 | } | |
410 | ||
411 | /* Compute total number of unwind entries and their total size. */ | |
412 | total_entries = unwind_entries + elf_unwind_entries + stub_entries; | |
413 | total_size = total_entries * sizeof (struct unwind_table_entry); | |
414 | ||
415 | /* Allocate memory for the unwind table. */ | |
416 | ui->table = obstack_alloc (&objfile->psymbol_obstack, total_size); | |
417 | ui->last = total_entries - 1; | |
418 | ||
419 | /* Internalize the standard unwind entries. */ | |
420 | index = 0; | |
421 | internalize_unwinds (objfile, &ui->table[index], unwind_sec, | |
bfaef242 | 422 | unwind_entries, unwind_size, text_offset); |
c5152d42 JL |
423 | index += unwind_entries; |
424 | internalize_unwinds (objfile, &ui->table[index], elf_unwind_sec, | |
bfaef242 | 425 | elf_unwind_entries, elf_unwind_size, text_offset); |
c5152d42 JL |
426 | index += elf_unwind_entries; |
427 | ||
428 | /* Now internalize the stub unwind entries. */ | |
429 | if (stub_unwind_size > 0) | |
430 | { | |
431 | unsigned int i; | |
432 | char *buf = alloca (stub_unwind_size); | |
433 | ||
434 | /* Read in the stub unwind entries. */ | |
435 | bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf, | |
436 | 0, stub_unwind_size); | |
437 | ||
438 | /* Now convert them into regular unwind entries. */ | |
439 | for (i = 0; i < stub_entries; i++, index++) | |
440 | { | |
441 | /* Clear out the next unwind entry. */ | |
442 | memset (&ui->table[index], 0, sizeof (struct unwind_table_entry)); | |
443 | ||
444 | /* Convert offset & size into region_start and region_end. | |
445 | Stuff away the stub type into "reserved" fields. */ | |
446 | ui->table[index].region_start = bfd_get_32 (objfile->obfd, | |
447 | (bfd_byte *) buf); | |
73a25072 | 448 | ui->table[index].region_start += text_offset; |
c5152d42 JL |
449 | buf += 4; |
450 | ui->table[index].stub_type = bfd_get_8 (objfile->obfd, | |
451 | (bfd_byte *) buf); | |
452 | buf += 2; | |
453 | ui->table[index].region_end | |
454 | = ui->table[index].region_start + 4 * | |
455 | (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1); | |
456 | buf += 2; | |
457 | } | |
458 | ||
459 | } | |
460 | ||
461 | /* Unwind table needs to be kept sorted. */ | |
462 | qsort (ui->table, total_entries, sizeof (struct unwind_table_entry), | |
463 | compare_unwind_entries); | |
464 | ||
465 | /* Keep a pointer to the unwind information. */ | |
466 | objfile->obj_private = (PTR) ui; | |
467 | } | |
468 | ||
66a1aa07 SG |
469 | /* Lookup the unwind (stack backtrace) info for the given PC. We search all |
470 | of the objfiles seeking the unwind table entry for this PC. Each objfile | |
471 | contains a sorted list of struct unwind_table_entry. Since we do a binary | |
472 | search of the unwind tables, we depend upon them to be sorted. */ | |
473 | ||
474 | static struct unwind_table_entry * | |
475 | find_unwind_entry(pc) | |
476 | CORE_ADDR pc; | |
477 | { | |
478 | int first, middle, last; | |
479 | struct objfile *objfile; | |
480 | ||
481 | ALL_OBJFILES (objfile) | |
482 | { | |
483 | struct obj_unwind_info *ui; | |
484 | ||
485 | ui = OBJ_UNWIND_INFO (objfile); | |
486 | ||
487 | if (!ui) | |
c5152d42 JL |
488 | { |
489 | read_unwind_info (objfile); | |
490 | ui = OBJ_UNWIND_INFO (objfile); | |
491 | } | |
66a1aa07 SG |
492 | |
493 | /* First, check the cache */ | |
494 | ||
495 | if (ui->cache | |
496 | && pc >= ui->cache->region_start | |
497 | && pc <= ui->cache->region_end) | |
498 | return ui->cache; | |
499 | ||
500 | /* Not in the cache, do a binary search */ | |
501 | ||
502 | first = 0; | |
503 | last = ui->last; | |
504 | ||
505 | while (first <= last) | |
506 | { | |
507 | middle = (first + last) / 2; | |
508 | if (pc >= ui->table[middle].region_start | |
509 | && pc <= ui->table[middle].region_end) | |
510 | { | |
511 | ui->cache = &ui->table[middle]; | |
512 | return &ui->table[middle]; | |
513 | } | |
514 | ||
515 | if (pc < ui->table[middle].region_start) | |
516 | last = middle - 1; | |
517 | else | |
518 | first = middle + 1; | |
519 | } | |
520 | } /* ALL_OBJFILES() */ | |
521 | return NULL; | |
522 | } | |
523 | ||
98c0e047 JL |
524 | /* start-sanitize-hpread */ |
525 | /* Return the adjustment necessary to make for addresses on the stack | |
526 | as presented by hpread.c. | |
527 | ||
528 | This is necessary because of the stack direction on the PA and the | |
529 | bizarre way in which someone (?) decided they wanted to handle | |
530 | frame pointerless code in GDB. */ | |
531 | int | |
532 | hpread_adjust_stack_address (func_addr) | |
533 | CORE_ADDR func_addr; | |
534 | { | |
535 | struct unwind_table_entry *u; | |
536 | ||
537 | u = find_unwind_entry (func_addr); | |
538 | if (!u) | |
539 | return 0; | |
540 | else | |
541 | return u->Total_frame_size << 3; | |
542 | } | |
543 | /* end-sanitize-hpread */ | |
544 | ||
70e43abe JL |
545 | /* Called to determine if PC is in an interrupt handler of some |
546 | kind. */ | |
547 | ||
548 | static int | |
549 | pc_in_interrupt_handler (pc) | |
550 | CORE_ADDR pc; | |
551 | { | |
552 | struct unwind_table_entry *u; | |
553 | struct minimal_symbol *msym_us; | |
554 | ||
555 | u = find_unwind_entry (pc); | |
556 | if (!u) | |
557 | return 0; | |
558 | ||
559 | /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though | |
560 | its frame isn't a pure interrupt frame. Deal with this. */ | |
561 | msym_us = lookup_minimal_symbol_by_pc (pc); | |
562 | ||
563 | return u->HP_UX_interrupt_marker && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)); | |
564 | } | |
565 | ||
5ac7f56e JK |
566 | /* Called when no unwind descriptor was found for PC. Returns 1 if it |
567 | appears that PC is in a linker stub. */ | |
5ac7f56e JK |
568 | |
569 | static int | |
570 | pc_in_linker_stub (pc) | |
571 | CORE_ADDR pc; | |
572 | { | |
5ac7f56e JK |
573 | int found_magic_instruction = 0; |
574 | int i; | |
08ecd8f3 JK |
575 | char buf[4]; |
576 | ||
577 | /* If unable to read memory, assume pc is not in a linker stub. */ | |
578 | if (target_read_memory (pc, buf, 4) != 0) | |
579 | return 0; | |
5ac7f56e | 580 | |
d08c6f4c JK |
581 | /* We are looking for something like |
582 | ||
583 | ; $$dyncall jams RP into this special spot in the frame (RP') | |
584 | ; before calling the "call stub" | |
585 | ldw -18(sp),rp | |
586 | ||
587 | ldsid (rp),r1 ; Get space associated with RP into r1 | |
588 | mtsp r1,sp ; Move it into space register 0 | |
589 | be,n 0(sr0),rp) ; back to your regularly scheduled program | |
590 | */ | |
591 | ||
5ac7f56e JK |
592 | /* Maximum known linker stub size is 4 instructions. Search forward |
593 | from the given PC, then backward. */ | |
594 | for (i = 0; i < 4; i++) | |
595 | { | |
6e35b037 | 596 | /* If we hit something with an unwind, stop searching this direction. */ |
5ac7f56e JK |
597 | |
598 | if (find_unwind_entry (pc + i * 4) != 0) | |
599 | break; | |
600 | ||
601 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
602 | return from a cross-space function call. */ | |
603 | if (read_memory_integer (pc + i * 4, 4) == 0x004010a1) | |
604 | { | |
605 | found_magic_instruction = 1; | |
606 | break; | |
607 | } | |
608 | /* Add code to handle long call/branch and argument relocation stubs | |
609 | here. */ | |
610 | } | |
611 | ||
612 | if (found_magic_instruction != 0) | |
613 | return 1; | |
614 | ||
615 | /* Now look backward. */ | |
616 | for (i = 0; i < 4; i++) | |
617 | { | |
6e35b037 | 618 | /* If we hit something with an unwind, stop searching this direction. */ |
5ac7f56e JK |
619 | |
620 | if (find_unwind_entry (pc - i * 4) != 0) | |
621 | break; | |
622 | ||
623 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
624 | return from a cross-space function call. */ | |
625 | if (read_memory_integer (pc - i * 4, 4) == 0x004010a1) | |
626 | { | |
627 | found_magic_instruction = 1; | |
628 | break; | |
629 | } | |
630 | /* Add code to handle long call/branch and argument relocation stubs | |
631 | here. */ | |
632 | } | |
633 | return found_magic_instruction; | |
634 | } | |
635 | ||
66a1aa07 SG |
636 | static int |
637 | find_return_regnum(pc) | |
638 | CORE_ADDR pc; | |
639 | { | |
640 | struct unwind_table_entry *u; | |
641 | ||
642 | u = find_unwind_entry (pc); | |
643 | ||
644 | if (!u) | |
645 | return RP_REGNUM; | |
646 | ||
647 | if (u->Millicode) | |
648 | return 31; | |
649 | ||
650 | return RP_REGNUM; | |
651 | } | |
652 | ||
5ac7f56e | 653 | /* Return size of frame, or -1 if we should use a frame pointer. */ |
66a1aa07 | 654 | int |
70e43abe | 655 | find_proc_framesize (pc) |
66a1aa07 SG |
656 | CORE_ADDR pc; |
657 | { | |
658 | struct unwind_table_entry *u; | |
70e43abe | 659 | struct minimal_symbol *msym_us; |
66a1aa07 | 660 | |
66a1aa07 SG |
661 | u = find_unwind_entry (pc); |
662 | ||
663 | if (!u) | |
5ac7f56e JK |
664 | { |
665 | if (pc_in_linker_stub (pc)) | |
666 | /* Linker stubs have a zero size frame. */ | |
667 | return 0; | |
668 | else | |
669 | return -1; | |
670 | } | |
66a1aa07 | 671 | |
70e43abe JL |
672 | msym_us = lookup_minimal_symbol_by_pc (pc); |
673 | ||
674 | /* If Save_SP is set, and we're not in an interrupt or signal caller, | |
675 | then we have a frame pointer. Use it. */ | |
676 | if (u->Save_SP && !pc_in_interrupt_handler (pc) | |
677 | && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us))) | |
eabbe766 JK |
678 | return -1; |
679 | ||
66a1aa07 SG |
680 | return u->Total_frame_size << 3; |
681 | } | |
682 | ||
5ac7f56e JK |
683 | /* Return offset from sp at which rp is saved, or 0 if not saved. */ |
684 | static int rp_saved PARAMS ((CORE_ADDR)); | |
685 | ||
686 | static int | |
687 | rp_saved (pc) | |
688 | CORE_ADDR pc; | |
66a1aa07 SG |
689 | { |
690 | struct unwind_table_entry *u; | |
691 | ||
692 | u = find_unwind_entry (pc); | |
693 | ||
694 | if (!u) | |
5ac7f56e JK |
695 | { |
696 | if (pc_in_linker_stub (pc)) | |
697 | /* This is the so-called RP'. */ | |
698 | return -24; | |
699 | else | |
700 | return 0; | |
701 | } | |
66a1aa07 SG |
702 | |
703 | if (u->Save_RP) | |
5ac7f56e | 704 | return -20; |
c7f3b703 JL |
705 | else if (u->stub_type != 0) |
706 | { | |
707 | switch (u->stub_type) | |
708 | { | |
709 | case EXPORT: | |
c2e00af6 | 710 | case IMPORT: |
c7f3b703 JL |
711 | return -24; |
712 | case PARAMETER_RELOCATION: | |
713 | return -8; | |
714 | default: | |
715 | return 0; | |
716 | } | |
717 | } | |
66a1aa07 SG |
718 | else |
719 | return 0; | |
720 | } | |
721 | \f | |
8fa74880 SG |
722 | int |
723 | frameless_function_invocation (frame) | |
669caa9c | 724 | struct frame_info *frame; |
8fa74880 | 725 | { |
b8ec9a79 | 726 | struct unwind_table_entry *u; |
8fa74880 | 727 | |
b8ec9a79 | 728 | u = find_unwind_entry (frame->pc); |
8fa74880 | 729 | |
b8ec9a79 | 730 | if (u == 0) |
7f43b9b7 | 731 | return 0; |
b8ec9a79 | 732 | |
c7f3b703 | 733 | return (u->Total_frame_size == 0 && u->stub_type == 0); |
8fa74880 SG |
734 | } |
735 | ||
66a1aa07 SG |
736 | CORE_ADDR |
737 | saved_pc_after_call (frame) | |
669caa9c | 738 | struct frame_info *frame; |
66a1aa07 SG |
739 | { |
740 | int ret_regnum; | |
edd86fb0 JL |
741 | CORE_ADDR pc; |
742 | struct unwind_table_entry *u; | |
66a1aa07 SG |
743 | |
744 | ret_regnum = find_return_regnum (get_frame_pc (frame)); | |
edd86fb0 JL |
745 | pc = read_register (ret_regnum) & ~0x3; |
746 | ||
747 | /* If PC is in a linker stub, then we need to dig the address | |
748 | the stub will return to out of the stack. */ | |
749 | u = find_unwind_entry (pc); | |
750 | if (u && u->stub_type != 0) | |
751 | return frame_saved_pc (frame); | |
752 | else | |
753 | return pc; | |
66a1aa07 SG |
754 | } |
755 | \f | |
756 | CORE_ADDR | |
757 | frame_saved_pc (frame) | |
669caa9c | 758 | struct frame_info *frame; |
66a1aa07 SG |
759 | { |
760 | CORE_ADDR pc = get_frame_pc (frame); | |
7f43b9b7 | 761 | struct unwind_table_entry *u; |
66a1aa07 | 762 | |
70e43abe JL |
763 | /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner |
764 | at the base of the frame in an interrupt handler. Registers within | |
765 | are saved in the exact same order as GDB numbers registers. How | |
766 | convienent. */ | |
767 | if (pc_in_interrupt_handler (pc)) | |
768 | return read_memory_integer (frame->frame + PC_REGNUM * 4, 4) & ~0x3; | |
769 | ||
770 | /* Deal with signal handler caller frames too. */ | |
771 | if (frame->signal_handler_caller) | |
772 | { | |
773 | CORE_ADDR rp; | |
774 | FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp); | |
54b2555b | 775 | return rp & ~0x3; |
70e43abe JL |
776 | } |
777 | ||
8fa74880 | 778 | if (frameless_function_invocation (frame)) |
66a1aa07 SG |
779 | { |
780 | int ret_regnum; | |
781 | ||
782 | ret_regnum = find_return_regnum (pc); | |
783 | ||
70e43abe JL |
784 | /* If the next frame is an interrupt frame or a signal |
785 | handler caller, then we need to look in the saved | |
786 | register area to get the return pointer (the values | |
787 | in the registers may not correspond to anything useful). */ | |
788 | if (frame->next | |
789 | && (frame->next->signal_handler_caller | |
790 | || pc_in_interrupt_handler (frame->next->pc))) | |
791 | { | |
70e43abe JL |
792 | struct frame_saved_regs saved_regs; |
793 | ||
54b2555b | 794 | get_frame_saved_regs (frame->next, &saved_regs); |
471fb8d8 | 795 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4) & 0x2) |
54b2555b JL |
796 | { |
797 | pc = read_memory_integer (saved_regs.regs[31], 4) & ~0x3; | |
798 | ||
799 | /* Syscalls are really two frames. The syscall stub itself | |
800 | with a return pointer in %rp and the kernel call with | |
801 | a return pointer in %r31. We return the %rp variant | |
802 | if %r31 is the same as frame->pc. */ | |
803 | if (pc == frame->pc) | |
804 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; | |
805 | } | |
70e43abe | 806 | else |
7f43b9b7 | 807 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; |
70e43abe JL |
808 | } |
809 | else | |
7f43b9b7 | 810 | pc = read_register (ret_regnum) & ~0x3; |
66a1aa07 | 811 | } |
66a1aa07 | 812 | else |
5ac7f56e | 813 | { |
edd86fb0 | 814 | int rp_offset; |
5ac7f56e | 815 | |
edd86fb0 JL |
816 | restart: |
817 | rp_offset = rp_saved (pc); | |
70e43abe JL |
818 | /* Similar to code in frameless function case. If the next |
819 | frame is a signal or interrupt handler, then dig the right | |
820 | information out of the saved register info. */ | |
821 | if (rp_offset == 0 | |
822 | && frame->next | |
823 | && (frame->next->signal_handler_caller | |
824 | || pc_in_interrupt_handler (frame->next->pc))) | |
825 | { | |
70e43abe JL |
826 | struct frame_saved_regs saved_regs; |
827 | ||
669caa9c | 828 | get_frame_saved_regs (frame->next, &saved_regs); |
471fb8d8 | 829 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4) & 0x2) |
54b2555b JL |
830 | { |
831 | pc = read_memory_integer (saved_regs.regs[31], 4) & ~0x3; | |
832 | ||
833 | /* Syscalls are really two frames. The syscall stub itself | |
834 | with a return pointer in %rp and the kernel call with | |
835 | a return pointer in %r31. We return the %rp variant | |
836 | if %r31 is the same as frame->pc. */ | |
837 | if (pc == frame->pc) | |
838 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; | |
839 | } | |
70e43abe | 840 | else |
7f43b9b7 | 841 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; |
70e43abe JL |
842 | } |
843 | else if (rp_offset == 0) | |
7f43b9b7 | 844 | pc = read_register (RP_REGNUM) & ~0x3; |
5ac7f56e | 845 | else |
7f43b9b7 | 846 | pc = read_memory_integer (frame->frame + rp_offset, 4) & ~0x3; |
5ac7f56e | 847 | } |
7f43b9b7 JL |
848 | |
849 | /* If PC is inside a linker stub, then dig out the address the stub | |
850 | will return to. */ | |
851 | u = find_unwind_entry (pc); | |
852 | if (u && u->stub_type != 0) | |
853 | goto restart; | |
854 | ||
855 | return pc; | |
66a1aa07 SG |
856 | } |
857 | \f | |
858 | /* We need to correct the PC and the FP for the outermost frame when we are | |
859 | in a system call. */ | |
860 | ||
861 | void | |
862 | init_extra_frame_info (fromleaf, frame) | |
863 | int fromleaf; | |
864 | struct frame_info *frame; | |
865 | { | |
866 | int flags; | |
867 | int framesize; | |
868 | ||
192c3eeb | 869 | if (frame->next && !fromleaf) |
66a1aa07 SG |
870 | return; |
871 | ||
192c3eeb JL |
872 | /* If the next frame represents a frameless function invocation |
873 | then we have to do some adjustments that are normally done by | |
874 | FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */ | |
875 | if (fromleaf) | |
876 | { | |
877 | /* Find the framesize of *this* frame without peeking at the PC | |
878 | in the current frame structure (it isn't set yet). */ | |
879 | framesize = find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame))); | |
880 | ||
881 | /* Now adjust our base frame accordingly. If we have a frame pointer | |
882 | use it, else subtract the size of this frame from the current | |
883 | frame. (we always want frame->frame to point at the lowest address | |
884 | in the frame). */ | |
885 | if (framesize == -1) | |
886 | frame->frame = read_register (FP_REGNUM); | |
887 | else | |
888 | frame->frame -= framesize; | |
889 | return; | |
890 | } | |
891 | ||
66a1aa07 SG |
892 | flags = read_register (FLAGS_REGNUM); |
893 | if (flags & 2) /* In system call? */ | |
894 | frame->pc = read_register (31) & ~0x3; | |
895 | ||
192c3eeb JL |
896 | /* The outermost frame is always derived from PC-framesize |
897 | ||
898 | One might think frameless innermost frames should have | |
899 | a frame->frame that is the same as the parent's frame->frame. | |
900 | That is wrong; frame->frame in that case should be the *high* | |
901 | address of the parent's frame. It's complicated as hell to | |
902 | explain, but the parent *always* creates some stack space for | |
903 | the child. So the child actually does have a frame of some | |
904 | sorts, and its base is the high address in its parent's frame. */ | |
66a1aa07 SG |
905 | framesize = find_proc_framesize(frame->pc); |
906 | if (framesize == -1) | |
907 | frame->frame = read_register (FP_REGNUM); | |
908 | else | |
909 | frame->frame = read_register (SP_REGNUM) - framesize; | |
66a1aa07 SG |
910 | } |
911 | \f | |
8966221d JK |
912 | /* Given a GDB frame, determine the address of the calling function's frame. |
913 | This will be used to create a new GDB frame struct, and then | |
914 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
915 | ||
916 | This may involve searching through prologues for several functions | |
917 | at boundaries where GCC calls HP C code, or where code which has | |
918 | a frame pointer calls code without a frame pointer. */ | |
8966221d | 919 | |
669caa9c | 920 | CORE_ADDR |
66a1aa07 SG |
921 | frame_chain (frame) |
922 | struct frame_info *frame; | |
923 | { | |
8966221d JK |
924 | int my_framesize, caller_framesize; |
925 | struct unwind_table_entry *u; | |
70e43abe JL |
926 | CORE_ADDR frame_base; |
927 | ||
928 | /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These | |
929 | are easy; at *sp we have a full save state strucutre which we can | |
930 | pull the old stack pointer from. Also see frame_saved_pc for | |
931 | code to dig a saved PC out of the save state structure. */ | |
932 | if (pc_in_interrupt_handler (frame->pc)) | |
933 | frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4, 4); | |
934 | else if (frame->signal_handler_caller) | |
935 | { | |
936 | FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base); | |
937 | } | |
938 | else | |
939 | frame_base = frame->frame; | |
66a1aa07 | 940 | |
8966221d JK |
941 | /* Get frame sizes for the current frame and the frame of the |
942 | caller. */ | |
943 | my_framesize = find_proc_framesize (frame->pc); | |
944 | caller_framesize = find_proc_framesize (FRAME_SAVED_PC(frame)); | |
66a1aa07 | 945 | |
8966221d JK |
946 | /* If caller does not have a frame pointer, then its frame |
947 | can be found at current_frame - caller_framesize. */ | |
948 | if (caller_framesize != -1) | |
70e43abe | 949 | return frame_base - caller_framesize; |
8966221d JK |
950 | |
951 | /* Both caller and callee have frame pointers and are GCC compiled | |
952 | (SAVE_SP bit in unwind descriptor is on for both functions. | |
953 | The previous frame pointer is found at the top of the current frame. */ | |
954 | if (caller_framesize == -1 && my_framesize == -1) | |
70e43abe | 955 | return read_memory_integer (frame_base, 4); |
8966221d JK |
956 | |
957 | /* Caller has a frame pointer, but callee does not. This is a little | |
958 | more difficult as GCC and HP C lay out locals and callee register save | |
959 | areas very differently. | |
960 | ||
961 | The previous frame pointer could be in a register, or in one of | |
962 | several areas on the stack. | |
963 | ||
964 | Walk from the current frame to the innermost frame examining | |
2f8c3639 | 965 | unwind descriptors to determine if %r3 ever gets saved into the |
8966221d | 966 | stack. If so return whatever value got saved into the stack. |
2f8c3639 | 967 | If it was never saved in the stack, then the value in %r3 is still |
8966221d JK |
968 | valid, so use it. |
969 | ||
2f8c3639 | 970 | We use information from unwind descriptors to determine if %r3 |
8966221d JK |
971 | is saved into the stack (Entry_GR field has this information). */ |
972 | ||
973 | while (frame) | |
974 | { | |
975 | u = find_unwind_entry (frame->pc); | |
976 | ||
977 | if (!u) | |
978 | { | |
01a03545 JK |
979 | /* We could find this information by examining prologues. I don't |
980 | think anyone has actually written any tools (not even "strip") | |
981 | which leave them out of an executable, so maybe this is a moot | |
982 | point. */ | |
8966221d JK |
983 | warning ("Unable to find unwind for PC 0x%x -- Help!", frame->pc); |
984 | return 0; | |
985 | } | |
986 | ||
987 | /* Entry_GR specifies the number of callee-saved general registers | |
2f8c3639 | 988 | saved in the stack. It starts at %r3, so %r3 would be 1. */ |
70e43abe JL |
989 | if (u->Entry_GR >= 1 || u->Save_SP |
990 | || frame->signal_handler_caller | |
991 | || pc_in_interrupt_handler (frame->pc)) | |
8966221d JK |
992 | break; |
993 | else | |
994 | frame = frame->next; | |
995 | } | |
996 | ||
997 | if (frame) | |
998 | { | |
999 | /* We may have walked down the chain into a function with a frame | |
1000 | pointer. */ | |
70e43abe JL |
1001 | if (u->Save_SP |
1002 | && !frame->signal_handler_caller | |
1003 | && !pc_in_interrupt_handler (frame->pc)) | |
8966221d | 1004 | return read_memory_integer (frame->frame, 4); |
2f8c3639 | 1005 | /* %r3 was saved somewhere in the stack. Dig it out. */ |
8966221d | 1006 | else |
c598654a | 1007 | { |
c598654a JL |
1008 | struct frame_saved_regs saved_regs; |
1009 | ||
669caa9c | 1010 | get_frame_saved_regs (frame, &saved_regs); |
c598654a JL |
1011 | return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); |
1012 | } | |
8966221d JK |
1013 | } |
1014 | else | |
1015 | { | |
2f8c3639 | 1016 | /* The value in %r3 was never saved into the stack (thus %r3 still |
8966221d | 1017 | holds the value of the previous frame pointer). */ |
2f8c3639 | 1018 | return read_register (FP_REGNUM); |
8966221d JK |
1019 | } |
1020 | } | |
66a1aa07 | 1021 | |
66a1aa07 SG |
1022 | \f |
1023 | /* To see if a frame chain is valid, see if the caller looks like it | |
1024 | was compiled with gcc. */ | |
1025 | ||
1026 | int | |
1027 | frame_chain_valid (chain, thisframe) | |
669caa9c SS |
1028 | CORE_ADDR chain; |
1029 | struct frame_info *thisframe; | |
66a1aa07 | 1030 | { |
247145e6 JK |
1031 | struct minimal_symbol *msym_us; |
1032 | struct minimal_symbol *msym_start; | |
70e43abe | 1033 | struct unwind_table_entry *u, *next_u = NULL; |
669caa9c | 1034 | struct frame_info *next; |
66a1aa07 SG |
1035 | |
1036 | if (!chain) | |
1037 | return 0; | |
1038 | ||
b8ec9a79 | 1039 | u = find_unwind_entry (thisframe->pc); |
4b01383b | 1040 | |
70e43abe JL |
1041 | if (u == NULL) |
1042 | return 1; | |
1043 | ||
247145e6 JK |
1044 | /* We can't just check that the same of msym_us is "_start", because |
1045 | someone idiotically decided that they were going to make a Ltext_end | |
1046 | symbol with the same address. This Ltext_end symbol is totally | |
1047 | indistinguishable (as nearly as I can tell) from the symbol for a function | |
1048 | which is (legitimately, since it is in the user's namespace) | |
1049 | named Ltext_end, so we can't just ignore it. */ | |
1050 | msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); | |
1051 | msym_start = lookup_minimal_symbol ("_start", NULL); | |
1052 | if (msym_us | |
1053 | && msym_start | |
1054 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) | |
b8ec9a79 | 1055 | return 0; |
5ac7f56e | 1056 | |
70e43abe JL |
1057 | next = get_next_frame (thisframe); |
1058 | if (next) | |
1059 | next_u = find_unwind_entry (next->pc); | |
5ac7f56e | 1060 | |
70e43abe JL |
1061 | /* If this frame does not save SP, has no stack, isn't a stub, |
1062 | and doesn't "call" an interrupt routine or signal handler caller, | |
1063 | then its not valid. */ | |
1064 | if (u->Save_SP || u->Total_frame_size || u->stub_type != 0 | |
1065 | || (thisframe->next && thisframe->next->signal_handler_caller) | |
1066 | || (next_u && next_u->HP_UX_interrupt_marker)) | |
b8ec9a79 | 1067 | return 1; |
5ac7f56e | 1068 | |
b8ec9a79 JK |
1069 | if (pc_in_linker_stub (thisframe->pc)) |
1070 | return 1; | |
4b01383b | 1071 | |
b8ec9a79 | 1072 | return 0; |
66a1aa07 SG |
1073 | } |
1074 | ||
66a1aa07 SG |
1075 | /* |
1076 | * These functions deal with saving and restoring register state | |
1077 | * around a function call in the inferior. They keep the stack | |
1078 | * double-word aligned; eventually, on an hp700, the stack will have | |
1079 | * to be aligned to a 64-byte boundary. | |
1080 | */ | |
1081 | ||
1082 | int | |
1083 | push_dummy_frame () | |
1084 | { | |
1085 | register CORE_ADDR sp; | |
1086 | register int regnum; | |
1087 | int int_buffer; | |
1088 | double freg_buffer; | |
1089 | ||
1090 | /* Space for "arguments"; the RP goes in here. */ | |
1091 | sp = read_register (SP_REGNUM) + 48; | |
1092 | int_buffer = read_register (RP_REGNUM) | 0x3; | |
1093 | write_memory (sp - 20, (char *)&int_buffer, 4); | |
1094 | ||
1095 | int_buffer = read_register (FP_REGNUM); | |
1096 | write_memory (sp, (char *)&int_buffer, 4); | |
1097 | ||
1098 | write_register (FP_REGNUM, sp); | |
1099 | ||
1100 | sp += 8; | |
1101 | ||
1102 | for (regnum = 1; regnum < 32; regnum++) | |
1103 | if (regnum != RP_REGNUM && regnum != FP_REGNUM) | |
1104 | sp = push_word (sp, read_register (regnum)); | |
1105 | ||
1106 | sp += 4; | |
1107 | ||
1108 | for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) | |
1109 | { | |
1110 | read_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); | |
1111 | sp = push_bytes (sp, (char *)&freg_buffer, 8); | |
1112 | } | |
1113 | sp = push_word (sp, read_register (IPSW_REGNUM)); | |
1114 | sp = push_word (sp, read_register (SAR_REGNUM)); | |
1115 | sp = push_word (sp, read_register (PCOQ_HEAD_REGNUM)); | |
1116 | sp = push_word (sp, read_register (PCSQ_HEAD_REGNUM)); | |
1117 | sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM)); | |
1118 | sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM)); | |
1119 | write_register (SP_REGNUM, sp); | |
1120 | } | |
1121 | ||
1122 | find_dummy_frame_regs (frame, frame_saved_regs) | |
1123 | struct frame_info *frame; | |
1124 | struct frame_saved_regs *frame_saved_regs; | |
1125 | { | |
1126 | CORE_ADDR fp = frame->frame; | |
1127 | int i; | |
1128 | ||
1129 | frame_saved_regs->regs[RP_REGNUM] = fp - 20 & ~0x3; | |
1130 | frame_saved_regs->regs[FP_REGNUM] = fp; | |
1131 | frame_saved_regs->regs[1] = fp + 8; | |
66a1aa07 | 1132 | |
b227992a SG |
1133 | for (fp += 12, i = 3; i < 32; i++) |
1134 | { | |
1135 | if (i != FP_REGNUM) | |
1136 | { | |
1137 | frame_saved_regs->regs[i] = fp; | |
1138 | fp += 4; | |
1139 | } | |
1140 | } | |
66a1aa07 SG |
1141 | |
1142 | fp += 4; | |
1143 | for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8) | |
1144 | frame_saved_regs->regs[i] = fp; | |
1145 | ||
1146 | frame_saved_regs->regs[IPSW_REGNUM] = fp; | |
b227992a SG |
1147 | frame_saved_regs->regs[SAR_REGNUM] = fp + 4; |
1148 | frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 8; | |
1149 | frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 12; | |
1150 | frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 16; | |
1151 | frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 20; | |
66a1aa07 SG |
1152 | } |
1153 | ||
1154 | int | |
1155 | hppa_pop_frame () | |
1156 | { | |
669caa9c | 1157 | register struct frame_info *frame = get_current_frame (); |
66a1aa07 SG |
1158 | register CORE_ADDR fp; |
1159 | register int regnum; | |
1160 | struct frame_saved_regs fsr; | |
66a1aa07 SG |
1161 | double freg_buffer; |
1162 | ||
669caa9c SS |
1163 | fp = FRAME_FP (frame); |
1164 | get_frame_saved_regs (frame, &fsr); | |
66a1aa07 | 1165 | |
0a64709e | 1166 | #ifndef NO_PC_SPACE_QUEUE_RESTORE |
66a1aa07 SG |
1167 | if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */ |
1168 | restore_pc_queue (&fsr); | |
0a64709e | 1169 | #endif |
66a1aa07 SG |
1170 | |
1171 | for (regnum = 31; regnum > 0; regnum--) | |
1172 | if (fsr.regs[regnum]) | |
1173 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); | |
1174 | ||
1175 | for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--) | |
1176 | if (fsr.regs[regnum]) | |
1177 | { | |
1178 | read_memory (fsr.regs[regnum], (char *)&freg_buffer, 8); | |
1179 | write_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); | |
1180 | } | |
1181 | ||
1182 | if (fsr.regs[IPSW_REGNUM]) | |
1183 | write_register (IPSW_REGNUM, | |
1184 | read_memory_integer (fsr.regs[IPSW_REGNUM], 4)); | |
1185 | ||
1186 | if (fsr.regs[SAR_REGNUM]) | |
1187 | write_register (SAR_REGNUM, | |
1188 | read_memory_integer (fsr.regs[SAR_REGNUM], 4)); | |
1189 | ||
ed1a07ad | 1190 | /* If the PC was explicitly saved, then just restore it. */ |
66a1aa07 SG |
1191 | if (fsr.regs[PCOQ_TAIL_REGNUM]) |
1192 | write_register (PCOQ_TAIL_REGNUM, | |
1193 | read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4)); | |
1194 | ||
ed1a07ad JK |
1195 | /* Else use the value in %rp to set the new PC. */ |
1196 | else | |
e9a3cde8 | 1197 | target_write_pc (read_register (RP_REGNUM), 0); |
ed1a07ad | 1198 | |
66a1aa07 SG |
1199 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); |
1200 | ||
1201 | if (fsr.regs[IPSW_REGNUM]) /* call dummy */ | |
1202 | write_register (SP_REGNUM, fp - 48); | |
1203 | else | |
1204 | write_register (SP_REGNUM, fp); | |
1205 | ||
1206 | flush_cached_frames (); | |
66a1aa07 SG |
1207 | } |
1208 | ||
1209 | /* | |
1210 | * After returning to a dummy on the stack, restore the instruction | |
1211 | * queue space registers. */ | |
1212 | ||
1213 | static int | |
1214 | restore_pc_queue (fsr) | |
1215 | struct frame_saved_regs *fsr; | |
1216 | { | |
1217 | CORE_ADDR pc = read_pc (); | |
1218 | CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4); | |
1219 | int pid; | |
67ac9759 | 1220 | struct target_waitstatus w; |
66a1aa07 SG |
1221 | int insn_count; |
1222 | ||
1223 | /* Advance past break instruction in the call dummy. */ | |
1224 | write_register (PCOQ_HEAD_REGNUM, pc + 4); | |
1225 | write_register (PCOQ_TAIL_REGNUM, pc + 8); | |
1226 | ||
1227 | /* | |
1228 | * HPUX doesn't let us set the space registers or the space | |
1229 | * registers of the PC queue through ptrace. Boo, hiss. | |
1230 | * Conveniently, the call dummy has this sequence of instructions | |
1231 | * after the break: | |
1232 | * mtsp r21, sr0 | |
1233 | * ble,n 0(sr0, r22) | |
1234 | * | |
1235 | * So, load up the registers and single step until we are in the | |
1236 | * right place. | |
1237 | */ | |
1238 | ||
1239 | write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4)); | |
1240 | write_register (22, new_pc); | |
1241 | ||
1242 | for (insn_count = 0; insn_count < 3; insn_count++) | |
1243 | { | |
8c5e0021 JK |
1244 | /* FIXME: What if the inferior gets a signal right now? Want to |
1245 | merge this into wait_for_inferior (as a special kind of | |
1246 | watchpoint? By setting a breakpoint at the end? Is there | |
1247 | any other choice? Is there *any* way to do this stuff with | |
1248 | ptrace() or some equivalent?). */ | |
66a1aa07 | 1249 | resume (1, 0); |
67ac9759 | 1250 | target_wait (inferior_pid, &w); |
66a1aa07 | 1251 | |
67ac9759 | 1252 | if (w.kind == TARGET_WAITKIND_SIGNALLED) |
66a1aa07 | 1253 | { |
67ac9759 | 1254 | stop_signal = w.value.sig; |
66a1aa07 | 1255 | terminal_ours_for_output (); |
67ac9759 JK |
1256 | printf_unfiltered ("\nProgram terminated with signal %s, %s.\n", |
1257 | target_signal_to_name (stop_signal), | |
1258 | target_signal_to_string (stop_signal)); | |
199b2450 | 1259 | gdb_flush (gdb_stdout); |
66a1aa07 SG |
1260 | return 0; |
1261 | } | |
1262 | } | |
8c5e0021 | 1263 | target_terminal_ours (); |
cad1498f | 1264 | target_fetch_registers (-1); |
66a1aa07 SG |
1265 | return 1; |
1266 | } | |
1267 | ||
1268 | CORE_ADDR | |
1269 | hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
1270 | int nargs; | |
4fd5eed4 | 1271 | value_ptr *args; |
66a1aa07 SG |
1272 | CORE_ADDR sp; |
1273 | int struct_return; | |
1274 | CORE_ADDR struct_addr; | |
1275 | { | |
1276 | /* array of arguments' offsets */ | |
1edc5cd2 | 1277 | int *offset = (int *)alloca(nargs * sizeof (int)); |
66a1aa07 SG |
1278 | int cum = 0; |
1279 | int i, alignment; | |
1280 | ||
1281 | for (i = 0; i < nargs; i++) | |
1282 | { | |
1283 | /* Coerce chars to int & float to double if necessary */ | |
1284 | args[i] = value_arg_coerce (args[i]); | |
1285 | ||
1286 | cum += TYPE_LENGTH (VALUE_TYPE (args[i])); | |
1287 | ||
1288 | /* value must go at proper alignment. Assume alignment is a | |
1289 | power of two.*/ | |
1290 | alignment = hppa_alignof (VALUE_TYPE (args[i])); | |
1291 | if (cum % alignment) | |
1292 | cum = (cum + alignment) & -alignment; | |
1293 | offset[i] = -cum; | |
1294 | } | |
558f4183 | 1295 | sp += max ((cum + 7) & -8, 16); |
66a1aa07 SG |
1296 | |
1297 | for (i = 0; i < nargs; i++) | |
1298 | write_memory (sp + offset[i], VALUE_CONTENTS (args[i]), | |
1299 | TYPE_LENGTH (VALUE_TYPE (args[i]))); | |
1300 | ||
1301 | if (struct_return) | |
1302 | write_register (28, struct_addr); | |
1303 | return sp + 32; | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Insert the specified number of args and function address | |
1308 | * into a call sequence of the above form stored at DUMMYNAME. | |
1309 | * | |
1310 | * On the hppa we need to call the stack dummy through $$dyncall. | |
1311 | * Therefore our version of FIX_CALL_DUMMY takes an extra argument, | |
1312 | * real_pc, which is the location where gdb should start up the | |
1313 | * inferior to do the function call. | |
1314 | */ | |
1315 | ||
1316 | CORE_ADDR | |
1317 | hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) | |
f4f0d174 | 1318 | char *dummy; |
66a1aa07 SG |
1319 | CORE_ADDR pc; |
1320 | CORE_ADDR fun; | |
1321 | int nargs; | |
4fd5eed4 | 1322 | value_ptr *args; |
66a1aa07 SG |
1323 | struct type *type; |
1324 | int gcc_p; | |
1325 | { | |
1326 | CORE_ADDR dyncall_addr, sr4export_addr; | |
1327 | struct minimal_symbol *msymbol; | |
6cfec929 | 1328 | int flags = read_register (FLAGS_REGNUM); |
19cd0c1f | 1329 | struct unwind_table_entry *u; |
66a1aa07 SG |
1330 | |
1331 | msymbol = lookup_minimal_symbol ("$$dyncall", (struct objfile *) NULL); | |
1332 | if (msymbol == NULL) | |
1333 | error ("Can't find an address for $$dyncall trampoline"); | |
1334 | ||
1335 | dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
1336 | ||
4f915914 JL |
1337 | /* FUN could be a procedure label, in which case we have to get |
1338 | its real address and the value of its GOT/DP. */ | |
1339 | if (fun & 0x2) | |
1340 | { | |
1341 | /* Get the GOT/DP value for the target function. It's | |
1342 | at *(fun+4). Note the call dummy is *NOT* allowed to | |
1343 | trash %r19 before calling the target function. */ | |
1344 | write_register (19, read_memory_integer ((fun & ~0x3) + 4, 4)); | |
1345 | ||
1346 | /* Now get the real address for the function we are calling, it's | |
1347 | at *fun. */ | |
1348 | fun = (CORE_ADDR) read_memory_integer (fun & ~0x3, 4); | |
1349 | } | |
1350 | ||
19cd0c1f JL |
1351 | /* If we are calling an import stub (eg calling into a dynamic library) |
1352 | then have sr4export call the magic __d_plt_call routine which is linked | |
1353 | in from end.o. (You can't use _sr4export to call the import stub as | |
1354 | the value in sp-24 will get fried and you end up returning to the | |
1355 | wrong location. You can't call the import stub directly as the code | |
1356 | to bind the PLT entry to a function can't return to a stack address.) */ | |
1357 | u = find_unwind_entry (fun); | |
1358 | if (u && u->stub_type == IMPORT) | |
1359 | { | |
1360 | CORE_ADDR new_fun; | |
1361 | msymbol = lookup_minimal_symbol ("__d_plt_call", (struct objfile *) NULL); | |
1362 | if (msymbol == NULL) | |
1363 | error ("Can't find an address for __d_plt_call trampoline"); | |
1364 | ||
1365 | /* This is where sr4export will jump to. */ | |
1366 | new_fun = SYMBOL_VALUE_ADDRESS (msymbol); | |
1367 | ||
1368 | /* We have to store the address of the stub in __shlib_funcptr. */ | |
1369 | msymbol = lookup_minimal_symbol ("__shlib_funcptr", | |
1370 | (struct objfile *)NULL); | |
1371 | if (msymbol == NULL) | |
1372 | error ("Can't find an address for __shlib_funcptr"); | |
1373 | ||
1374 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), (char *)&fun, 4); | |
1375 | fun = new_fun; | |
1376 | ||
1377 | } | |
1378 | ||
1379 | /* We still need sr4export's address too. */ | |
66a1aa07 SG |
1380 | msymbol = lookup_minimal_symbol ("_sr4export", (struct objfile *) NULL); |
1381 | if (msymbol == NULL) | |
1382 | error ("Can't find an address for _sr4export trampoline"); | |
1383 | ||
1384 | sr4export_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
1385 | ||
f4f0d174 JK |
1386 | store_unsigned_integer |
1387 | (&dummy[9*REGISTER_SIZE], | |
1388 | REGISTER_SIZE, | |
1389 | deposit_21 (fun >> 11, | |
1390 | extract_unsigned_integer (&dummy[9*REGISTER_SIZE], | |
1391 | REGISTER_SIZE))); | |
1392 | store_unsigned_integer | |
1393 | (&dummy[10*REGISTER_SIZE], | |
1394 | REGISTER_SIZE, | |
1395 | deposit_14 (fun & MASK_11, | |
1396 | extract_unsigned_integer (&dummy[10*REGISTER_SIZE], | |
1397 | REGISTER_SIZE))); | |
1398 | store_unsigned_integer | |
1399 | (&dummy[12*REGISTER_SIZE], | |
1400 | REGISTER_SIZE, | |
1401 | deposit_21 (sr4export_addr >> 11, | |
1402 | extract_unsigned_integer (&dummy[12*REGISTER_SIZE], | |
1403 | REGISTER_SIZE))); | |
1404 | store_unsigned_integer | |
1405 | (&dummy[13*REGISTER_SIZE], | |
1406 | REGISTER_SIZE, | |
1407 | deposit_14 (sr4export_addr & MASK_11, | |
1408 | extract_unsigned_integer (&dummy[13*REGISTER_SIZE], | |
1409 | REGISTER_SIZE))); | |
66a1aa07 SG |
1410 | |
1411 | write_register (22, pc); | |
1412 | ||
6cfec929 JK |
1413 | /* If we are in a syscall, then we should call the stack dummy |
1414 | directly. $$dyncall is not needed as the kernel sets up the | |
1415 | space id registers properly based on the value in %r31. In | |
1416 | fact calling $$dyncall will not work because the value in %r22 | |
1417 | will be clobbered on the syscall exit path. */ | |
1418 | if (flags & 2) | |
1419 | return pc; | |
1420 | else | |
1421 | return dyncall_addr; | |
1422 | ||
66a1aa07 SG |
1423 | } |
1424 | ||
d3862cae JK |
1425 | /* Get the PC from %r31 if currently in a syscall. Also mask out privilege |
1426 | bits. */ | |
669caa9c | 1427 | |
d3862cae | 1428 | CORE_ADDR |
e9a3cde8 JL |
1429 | target_read_pc (pid) |
1430 | int pid; | |
d3862cae JK |
1431 | { |
1432 | int flags = read_register (FLAGS_REGNUM); | |
1433 | ||
1434 | if (flags & 2) | |
1435 | return read_register (31) & ~0x3; | |
1436 | return read_register (PC_REGNUM) & ~0x3; | |
1437 | } | |
1438 | ||
6cfec929 JK |
1439 | /* Write out the PC. If currently in a syscall, then also write the new |
1440 | PC value into %r31. */ | |
669caa9c | 1441 | |
6cfec929 | 1442 | void |
e9a3cde8 | 1443 | target_write_pc (v, pid) |
6cfec929 | 1444 | CORE_ADDR v; |
e9a3cde8 | 1445 | int pid; |
6cfec929 JK |
1446 | { |
1447 | int flags = read_register (FLAGS_REGNUM); | |
1448 | ||
1449 | /* If in a syscall, then set %r31. Also make sure to get the | |
1450 | privilege bits set correctly. */ | |
1451 | if (flags & 2) | |
1452 | write_register (31, (long) (v | 0x3)); | |
1453 | ||
1454 | write_register (PC_REGNUM, (long) v); | |
1455 | write_register (NPC_REGNUM, (long) v + 4); | |
1456 | } | |
1457 | ||
66a1aa07 SG |
1458 | /* return the alignment of a type in bytes. Structures have the maximum |
1459 | alignment required by their fields. */ | |
1460 | ||
1461 | static int | |
1462 | hppa_alignof (arg) | |
1463 | struct type *arg; | |
1464 | { | |
1465 | int max_align, align, i; | |
1466 | switch (TYPE_CODE (arg)) | |
1467 | { | |
1468 | case TYPE_CODE_PTR: | |
1469 | case TYPE_CODE_INT: | |
1470 | case TYPE_CODE_FLT: | |
1471 | return TYPE_LENGTH (arg); | |
1472 | case TYPE_CODE_ARRAY: | |
1473 | return hppa_alignof (TYPE_FIELD_TYPE (arg, 0)); | |
1474 | case TYPE_CODE_STRUCT: | |
1475 | case TYPE_CODE_UNION: | |
1476 | max_align = 2; | |
1477 | for (i = 0; i < TYPE_NFIELDS (arg); i++) | |
1478 | { | |
1479 | /* Bit fields have no real alignment. */ | |
1480 | if (!TYPE_FIELD_BITPOS (arg, i)) | |
1481 | { | |
1482 | align = hppa_alignof (TYPE_FIELD_TYPE (arg, i)); | |
1483 | max_align = max (max_align, align); | |
1484 | } | |
1485 | } | |
1486 | return max_align; | |
1487 | default: | |
1488 | return 4; | |
1489 | } | |
1490 | } | |
1491 | ||
1492 | /* Print the register regnum, or all registers if regnum is -1 */ | |
1493 | ||
1494 | pa_do_registers_info (regnum, fpregs) | |
1495 | int regnum; | |
1496 | int fpregs; | |
1497 | { | |
1498 | char raw_regs [REGISTER_BYTES]; | |
1499 | int i; | |
1500 | ||
1501 | for (i = 0; i < NUM_REGS; i++) | |
1502 | read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); | |
1503 | if (regnum == -1) | |
1504 | pa_print_registers (raw_regs, regnum, fpregs); | |
1505 | else if (regnum < FP0_REGNUM) | |
199b2450 | 1506 | printf_unfiltered ("%s %x\n", reg_names[regnum], *(long *)(raw_regs + |
66a1aa07 SG |
1507 | REGISTER_BYTE (regnum))); |
1508 | else | |
1509 | pa_print_fp_reg (regnum); | |
1510 | } | |
1511 | ||
1512 | pa_print_registers (raw_regs, regnum, fpregs) | |
1513 | char *raw_regs; | |
1514 | int regnum; | |
1515 | int fpregs; | |
1516 | { | |
1517 | int i; | |
1518 | ||
1519 | for (i = 0; i < 18; i++) | |
199b2450 | 1520 | printf_unfiltered ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n", |
66a1aa07 SG |
1521 | reg_names[i], |
1522 | *(int *)(raw_regs + REGISTER_BYTE (i)), | |
1523 | reg_names[i + 18], | |
1524 | *(int *)(raw_regs + REGISTER_BYTE (i + 18)), | |
1525 | reg_names[i + 36], | |
1526 | *(int *)(raw_regs + REGISTER_BYTE (i + 36)), | |
1527 | reg_names[i + 54], | |
1528 | *(int *)(raw_regs + REGISTER_BYTE (i + 54))); | |
1529 | ||
1530 | if (fpregs) | |
1531 | for (i = 72; i < NUM_REGS; i++) | |
1532 | pa_print_fp_reg (i); | |
1533 | } | |
1534 | ||
1535 | pa_print_fp_reg (i) | |
1536 | int i; | |
1537 | { | |
1538 | unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
1539 | unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
66a1aa07 | 1540 | |
eb1167c6 | 1541 | /* Get 32bits of data. */ |
66a1aa07 | 1542 | read_relative_register_raw_bytes (i, raw_buffer); |
ad09cb2b | 1543 | |
eb1167c6 JL |
1544 | /* Put it in the buffer. No conversions are ever necessary. */ |
1545 | memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); | |
66a1aa07 | 1546 | |
199b2450 | 1547 | fputs_filtered (reg_names[i], gdb_stdout); |
eb1167c6 JL |
1548 | print_spaces_filtered (8 - strlen (reg_names[i]), gdb_stdout); |
1549 | fputs_filtered ("(single precision) ", gdb_stdout); | |
66a1aa07 | 1550 | |
199b2450 | 1551 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, gdb_stdout, 0, |
66a1aa07 SG |
1552 | 1, 0, Val_pretty_default); |
1553 | printf_filtered ("\n"); | |
eb1167c6 JL |
1554 | |
1555 | /* If "i" is even, then this register can also be a double-precision | |
1556 | FP register. Dump it out as such. */ | |
1557 | if ((i % 2) == 0) | |
1558 | { | |
1559 | /* Get the data in raw format for the 2nd half. */ | |
1560 | read_relative_register_raw_bytes (i + 1, raw_buffer); | |
1561 | ||
1562 | /* Copy it into the appropriate part of the virtual buffer. */ | |
1563 | memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buffer, | |
1564 | REGISTER_RAW_SIZE (i)); | |
1565 | ||
1566 | /* Dump it as a double. */ | |
1567 | fputs_filtered (reg_names[i], gdb_stdout); | |
1568 | print_spaces_filtered (8 - strlen (reg_names[i]), gdb_stdout); | |
1569 | fputs_filtered ("(double precision) ", gdb_stdout); | |
1570 | ||
1571 | val_print (builtin_type_double, virtual_buffer, 0, gdb_stdout, 0, | |
1572 | 1, 0, Val_pretty_default); | |
1573 | printf_filtered ("\n"); | |
1574 | } | |
66a1aa07 SG |
1575 | } |
1576 | ||
de482138 JL |
1577 | /* Figure out if PC is in a trampoline, and if so find out where |
1578 | the trampoline will jump to. If not in a trampoline, return zero. | |
66a1aa07 | 1579 | |
de482138 JL |
1580 | Simple code examination probably is not a good idea since the code |
1581 | sequences in trampolines can also appear in user code. | |
1582 | ||
1583 | We use unwinds and information from the minimal symbol table to | |
1584 | determine when we're in a trampoline. This won't work for ELF | |
1585 | (yet) since it doesn't create stub unwind entries. Whether or | |
1586 | not ELF will create stub unwinds or normal unwinds for linker | |
1587 | stubs is still being debated. | |
1588 | ||
1589 | This should handle simple calls through dyncall or sr4export, | |
1590 | long calls, argument relocation stubs, and dyncall/sr4export | |
1591 | calling an argument relocation stub. It even handles some stubs | |
1592 | used in dynamic executables. */ | |
66a1aa07 SG |
1593 | |
1594 | CORE_ADDR | |
1595 | skip_trampoline_code (pc, name) | |
1596 | CORE_ADDR pc; | |
1597 | char *name; | |
1598 | { | |
de482138 JL |
1599 | long orig_pc = pc; |
1600 | long prev_inst, curr_inst, loc; | |
66a1aa07 | 1601 | static CORE_ADDR dyncall = 0; |
de482138 | 1602 | static CORE_ADDR sr4export = 0; |
66a1aa07 | 1603 | struct minimal_symbol *msym; |
de482138 | 1604 | struct unwind_table_entry *u; |
66a1aa07 | 1605 | |
de482138 JL |
1606 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a |
1607 | new exec file */ | |
66a1aa07 SG |
1608 | |
1609 | if (!dyncall) | |
1610 | { | |
1611 | msym = lookup_minimal_symbol ("$$dyncall", NULL); | |
1612 | if (msym) | |
1613 | dyncall = SYMBOL_VALUE_ADDRESS (msym); | |
1614 | else | |
1615 | dyncall = -1; | |
1616 | } | |
1617 | ||
de482138 JL |
1618 | if (!sr4export) |
1619 | { | |
1620 | msym = lookup_minimal_symbol ("_sr4export", NULL); | |
1621 | if (msym) | |
1622 | sr4export = SYMBOL_VALUE_ADDRESS (msym); | |
1623 | else | |
1624 | sr4export = -1; | |
1625 | } | |
1626 | ||
1627 | /* Addresses passed to dyncall may *NOT* be the actual address | |
669caa9c | 1628 | of the function. So we may have to do something special. */ |
66a1aa07 | 1629 | if (pc == dyncall) |
de482138 JL |
1630 | { |
1631 | pc = (CORE_ADDR) read_register (22); | |
66a1aa07 | 1632 | |
de482138 JL |
1633 | /* If bit 30 (counting from the left) is on, then pc is the address of |
1634 | the PLT entry for this function, not the address of the function | |
1635 | itself. Bit 31 has meaning too, but only for MPE. */ | |
1636 | if (pc & 0x2) | |
1637 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, 4); | |
1638 | } | |
1639 | else if (pc == sr4export) | |
1640 | pc = (CORE_ADDR) (read_register (22)); | |
66a1aa07 | 1641 | |
de482138 JL |
1642 | /* Get the unwind descriptor corresponding to PC, return zero |
1643 | if no unwind was found. */ | |
1644 | u = find_unwind_entry (pc); | |
1645 | if (!u) | |
1646 | return 0; | |
1647 | ||
1648 | /* If this isn't a linker stub, then return now. */ | |
1649 | if (u->stub_type == 0) | |
1650 | return orig_pc == pc ? 0 : pc & ~0x3; | |
1651 | ||
1652 | /* It's a stub. Search for a branch and figure out where it goes. | |
1653 | Note we have to handle multi insn branch sequences like ldil;ble. | |
1654 | Most (all?) other branches can be determined by examining the contents | |
1655 | of certain registers and the stack. */ | |
1656 | loc = pc; | |
1657 | curr_inst = 0; | |
1658 | prev_inst = 0; | |
1659 | while (1) | |
1660 | { | |
1661 | /* Make sure we haven't walked outside the range of this stub. */ | |
1662 | if (u != find_unwind_entry (loc)) | |
1663 | { | |
1664 | warning ("Unable to find branch in linker stub"); | |
1665 | return orig_pc == pc ? 0 : pc & ~0x3; | |
1666 | } | |
1667 | ||
1668 | prev_inst = curr_inst; | |
1669 | curr_inst = read_memory_integer (loc, 4); | |
66a1aa07 | 1670 | |
de482138 JL |
1671 | /* Does it look like a branch external using %r1? Then it's the |
1672 | branch from the stub to the actual function. */ | |
1673 | if ((curr_inst & 0xffe0e000) == 0xe0202000) | |
1674 | { | |
1675 | /* Yup. See if the previous instruction loaded | |
1676 | a value into %r1. If so compute and return the jump address. */ | |
4cbc4bf1 | 1677 | if ((prev_inst & 0xffe00000) == 0x20200000) |
de482138 JL |
1678 | return (extract_21 (prev_inst) + extract_17 (curr_inst)) & ~0x3; |
1679 | else | |
1680 | { | |
1681 | warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."); | |
1682 | return orig_pc == pc ? 0 : pc & ~0x3; | |
1683 | } | |
1684 | } | |
1685 | ||
f32fc5f9 JL |
1686 | /* Does it look like a be 0(sr0,%r21)? That's the branch from an |
1687 | import stub to an export stub. | |
1688 | ||
1689 | It is impossible to determine the target of the branch via | |
1690 | simple examination of instructions and/or data (consider | |
1691 | that the address in the plabel may be the address of the | |
1692 | bind-on-reference routine in the dynamic loader). | |
1693 | ||
1694 | So we have try an alternative approach. | |
1695 | ||
1696 | Get the name of the symbol at our current location; it should | |
1697 | be a stub symbol with the same name as the symbol in the | |
1698 | shared library. | |
1699 | ||
1700 | Then lookup a minimal symbol with the same name; we should | |
1701 | get the minimal symbol for the target routine in the shared | |
1702 | library as those take precedence of import/export stubs. */ | |
1703 | if (curr_inst == 0xe2a00000) | |
1704 | { | |
1705 | struct minimal_symbol *stubsym, *libsym; | |
1706 | ||
1707 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
1708 | if (stubsym == NULL) | |
1709 | { | |
1710 | warning ("Unable to find symbol for 0x%x", loc); | |
1711 | return orig_pc == pc ? 0 : pc & ~0x3; | |
1712 | } | |
1713 | ||
1714 | libsym = lookup_minimal_symbol (SYMBOL_NAME (stubsym), NULL); | |
1715 | if (libsym == NULL) | |
1716 | { | |
1717 | warning ("Unable to find library symbol for %s\n", | |
1718 | SYMBOL_NAME (stubsym)); | |
1719 | return orig_pc == pc ? 0 : pc & ~0x3; | |
1720 | } | |
1721 | ||
1722 | return SYMBOL_VALUE (libsym); | |
1723 | } | |
1724 | ||
88b91d4a JL |
1725 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a |
1726 | branch from the stub to the actual function. */ | |
1727 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 | |
1728 | || (curr_inst & 0xffe0e000) == 0xe8000000) | |
de482138 JL |
1729 | return (loc + extract_17 (curr_inst) + 8) & ~0x3; |
1730 | ||
1731 | /* Does it look like bv (rp)? Note this depends on the | |
1732 | current stack pointer being the same as the stack | |
1733 | pointer in the stub itself! This is a branch on from the | |
1734 | stub back to the original caller. */ | |
1735 | else if ((curr_inst & 0xffe0e000) == 0xe840c000) | |
1736 | { | |
1737 | /* Yup. See if the previous instruction loaded | |
1738 | rp from sp - 8. */ | |
1739 | if (prev_inst == 0x4bc23ff1) | |
1740 | return (read_memory_integer | |
1741 | (read_register (SP_REGNUM) - 8, 4)) & ~0x3; | |
1742 | else | |
1743 | { | |
1744 | warning ("Unable to find restore of %%rp before bv (%%rp)."); | |
1745 | return orig_pc == pc ? 0 : pc & ~0x3; | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
1750 | the original caller from the stub. Used in dynamic executables. */ | |
1751 | else if (curr_inst == 0xe0400002) | |
1752 | { | |
1753 | /* The value we jump to is sitting in sp - 24. But that's | |
1754 | loaded several instructions before the be instruction. | |
1755 | I guess we could check for the previous instruction being | |
1756 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
1757 | return (read_memory_integer | |
1758 | (read_register (SP_REGNUM) - 24, 4)) & ~0x3; | |
1759 | } | |
1760 | ||
1761 | /* Haven't found the branch yet, but we're still in the stub. | |
1762 | Keep looking. */ | |
1763 | loc += 4; | |
1764 | } | |
66a1aa07 SG |
1765 | } |
1766 | ||
c598654a JL |
1767 | /* For the given instruction (INST), return any adjustment it makes |
1768 | to the stack pointer or zero for no adjustment. | |
1769 | ||
1770 | This only handles instructions commonly found in prologues. */ | |
1771 | ||
1772 | static int | |
1773 | prologue_inst_adjust_sp (inst) | |
1774 | unsigned long inst; | |
1775 | { | |
1776 | /* This must persist across calls. */ | |
1777 | static int save_high21; | |
1778 | ||
1779 | /* The most common way to perform a stack adjustment ldo X(sp),sp */ | |
1780 | if ((inst & 0xffffc000) == 0x37de0000) | |
1781 | return extract_14 (inst); | |
1782 | ||
1783 | /* stwm X,D(sp) */ | |
1784 | if ((inst & 0xffe00000) == 0x6fc00000) | |
1785 | return extract_14 (inst); | |
1786 | ||
1787 | /* addil high21,%r1; ldo low11,(%r1),%r30) | |
1788 | save high bits in save_high21 for later use. */ | |
1789 | if ((inst & 0xffe00000) == 0x28200000) | |
1790 | { | |
1791 | save_high21 = extract_21 (inst); | |
1792 | return 0; | |
1793 | } | |
1794 | ||
1795 | if ((inst & 0xffff0000) == 0x343e0000) | |
1796 | return save_high21 + extract_14 (inst); | |
1797 | ||
1798 | /* fstws as used by the HP compilers. */ | |
1799 | if ((inst & 0xffffffe0) == 0x2fd01220) | |
1800 | return extract_5_load (inst); | |
1801 | ||
1802 | /* No adjustment. */ | |
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | /* Return nonzero if INST is a branch of some kind, else return zero. */ | |
1807 | ||
1808 | static int | |
1809 | is_branch (inst) | |
1810 | unsigned long inst; | |
1811 | { | |
1812 | switch (inst >> 26) | |
1813 | { | |
1814 | case 0x20: | |
1815 | case 0x21: | |
1816 | case 0x22: | |
1817 | case 0x23: | |
1818 | case 0x28: | |
1819 | case 0x29: | |
1820 | case 0x2a: | |
1821 | case 0x2b: | |
1822 | case 0x30: | |
1823 | case 0x31: | |
1824 | case 0x32: | |
1825 | case 0x33: | |
1826 | case 0x38: | |
1827 | case 0x39: | |
1828 | case 0x3a: | |
1829 | return 1; | |
1830 | ||
1831 | default: | |
1832 | return 0; | |
1833 | } | |
1834 | } | |
1835 | ||
1836 | /* Return the register number for a GR which is saved by INST or | |
edd86fb0 | 1837 | zero it INST does not save a GR. */ |
c598654a JL |
1838 | |
1839 | static int | |
1840 | inst_saves_gr (inst) | |
1841 | unsigned long inst; | |
1842 | { | |
1843 | /* Does it look like a stw? */ | |
1844 | if ((inst >> 26) == 0x1a) | |
1845 | return extract_5R_store (inst); | |
1846 | ||
edd86fb0 | 1847 | /* Does it look like a stwm? GCC & HPC may use this in prologues. */ |
c598654a JL |
1848 | if ((inst >> 26) == 0x1b) |
1849 | return extract_5R_store (inst); | |
1850 | ||
edd86fb0 JL |
1851 | /* Does it look like sth or stb? HPC versions 9.0 and later use these |
1852 | too. */ | |
1853 | if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18) | |
1854 | return extract_5R_store (inst); | |
1855 | ||
c598654a JL |
1856 | return 0; |
1857 | } | |
1858 | ||
1859 | /* Return the register number for a FR which is saved by INST or | |
1860 | zero it INST does not save a FR. | |
1861 | ||
1862 | Note we only care about full 64bit register stores (that's the only | |
edd86fb0 JL |
1863 | kind of stores the prologue will use). |
1864 | ||
1865 | FIXME: What about argument stores with the HP compiler in ANSI mode? */ | |
c598654a JL |
1866 | |
1867 | static int | |
1868 | inst_saves_fr (inst) | |
1869 | unsigned long inst; | |
1870 | { | |
edd86fb0 | 1871 | if ((inst & 0xfc00dfc0) == 0x2c001200) |
c598654a JL |
1872 | return extract_5r_store (inst); |
1873 | return 0; | |
1874 | } | |
1875 | ||
66a1aa07 | 1876 | /* Advance PC across any function entry prologue instructions |
c598654a | 1877 | to reach some "real" code. |
66a1aa07 | 1878 | |
c598654a JL |
1879 | Use information in the unwind table to determine what exactly should |
1880 | be in the prologue. */ | |
66a1aa07 SG |
1881 | |
1882 | CORE_ADDR | |
de482138 | 1883 | skip_prologue (pc) |
66a1aa07 SG |
1884 | CORE_ADDR pc; |
1885 | { | |
34df79fc | 1886 | char buf[4]; |
c598654a | 1887 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; |
edd86fb0 | 1888 | unsigned long args_stored, status, i; |
c598654a | 1889 | struct unwind_table_entry *u; |
66a1aa07 | 1890 | |
c598654a JL |
1891 | u = find_unwind_entry (pc); |
1892 | if (!u) | |
fdafbfad | 1893 | return pc; |
c598654a | 1894 | |
de482138 JL |
1895 | /* If we are not at the beginning of a function, then return now. */ |
1896 | if ((pc & ~0x3) != u->region_start) | |
1897 | return pc; | |
1898 | ||
c598654a JL |
1899 | /* This is how much of a frame adjustment we need to account for. */ |
1900 | stack_remaining = u->Total_frame_size << 3; | |
66a1aa07 | 1901 | |
c598654a JL |
1902 | /* Magic register saves we want to know about. */ |
1903 | save_rp = u->Save_RP; | |
1904 | save_sp = u->Save_SP; | |
1905 | ||
edd86fb0 JL |
1906 | /* An indication that args may be stored into the stack. Unfortunately |
1907 | the HPUX compilers tend to set this in cases where no args were | |
1908 | stored too!. */ | |
1909 | args_stored = u->Args_stored; | |
1910 | ||
c598654a JL |
1911 | /* Turn the Entry_GR field into a bitmask. */ |
1912 | save_gr = 0; | |
1913 | for (i = 3; i < u->Entry_GR + 3; i++) | |
66a1aa07 | 1914 | { |
c598654a JL |
1915 | /* Frame pointer gets saved into a special location. */ |
1916 | if (u->Save_SP && i == FP_REGNUM) | |
1917 | continue; | |
1918 | ||
1919 | save_gr |= (1 << i); | |
1920 | } | |
1921 | ||
1922 | /* Turn the Entry_FR field into a bitmask too. */ | |
1923 | save_fr = 0; | |
1924 | for (i = 12; i < u->Entry_FR + 12; i++) | |
1925 | save_fr |= (1 << i); | |
1926 | ||
1927 | /* Loop until we find everything of interest or hit a branch. | |
1928 | ||
1929 | For unoptimized GCC code and for any HP CC code this will never ever | |
1930 | examine any user instructions. | |
1931 | ||
1932 | For optimzied GCC code we're faced with problems. GCC will schedule | |
1933 | its prologue and make prologue instructions available for delay slot | |
1934 | filling. The end result is user code gets mixed in with the prologue | |
1935 | and a prologue instruction may be in the delay slot of the first branch | |
1936 | or call. | |
1937 | ||
1938 | Some unexpected things are expected with debugging optimized code, so | |
1939 | we allow this routine to walk past user instructions in optimized | |
1940 | GCC code. */ | |
edd86fb0 JL |
1941 | while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0 |
1942 | || args_stored) | |
c598654a | 1943 | { |
edd86fb0 JL |
1944 | unsigned int reg_num; |
1945 | unsigned long old_stack_remaining, old_save_gr, old_save_fr; | |
1946 | unsigned long old_save_rp, old_save_sp, old_args_stored, next_inst; | |
1947 | ||
1948 | /* Save copies of all the triggers so we can compare them later | |
1949 | (only for HPC). */ | |
1950 | old_save_gr = save_gr; | |
1951 | old_save_fr = save_fr; | |
1952 | old_save_rp = save_rp; | |
1953 | old_save_sp = save_sp; | |
1954 | old_stack_remaining = stack_remaining; | |
1955 | ||
c598654a JL |
1956 | status = target_read_memory (pc, buf, 4); |
1957 | inst = extract_unsigned_integer (buf, 4); | |
edd86fb0 | 1958 | |
c598654a JL |
1959 | /* Yow! */ |
1960 | if (status != 0) | |
1961 | return pc; | |
1962 | ||
1963 | /* Note the interesting effects of this instruction. */ | |
1964 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
1965 | ||
1966 | /* There is only one instruction used for saving RP into the stack. */ | |
1967 | if (inst == 0x6bc23fd9) | |
1968 | save_rp = 0; | |
1969 | ||
1970 | /* This is the only way we save SP into the stack. At this time | |
1971 | the HP compilers never bother to save SP into the stack. */ | |
1972 | if ((inst & 0xffffc000) == 0x6fc10000) | |
1973 | save_sp = 0; | |
1974 | ||
1975 | /* Account for general and floating-point register saves. */ | |
edd86fb0 JL |
1976 | reg_num = inst_saves_gr (inst); |
1977 | save_gr &= ~(1 << reg_num); | |
1978 | ||
1979 | /* Ugh. Also account for argument stores into the stack. | |
1980 | Unfortunately args_stored only tells us that some arguments | |
1981 | where stored into the stack. Not how many or what kind! | |
1982 | ||
1983 | This is a kludge as on the HP compiler sets this bit and it | |
1984 | never does prologue scheduling. So once we see one, skip past | |
1985 | all of them. We have similar code for the fp arg stores below. | |
1986 | ||
1987 | FIXME. Can still die if we have a mix of GR and FR argument | |
1988 | stores! */ | |
1989 | if (reg_num >= 23 && reg_num <= 26) | |
1990 | { | |
1991 | while (reg_num >= 23 && reg_num <= 26) | |
1992 | { | |
1993 | pc += 4; | |
1994 | status = target_read_memory (pc, buf, 4); | |
1995 | inst = extract_unsigned_integer (buf, 4); | |
1996 | if (status != 0) | |
1997 | return pc; | |
1998 | reg_num = inst_saves_gr (inst); | |
1999 | } | |
2000 | args_stored = 0; | |
2001 | continue; | |
2002 | } | |
2003 | ||
2004 | reg_num = inst_saves_fr (inst); | |
2005 | save_fr &= ~(1 << reg_num); | |
2006 | ||
2007 | status = target_read_memory (pc + 4, buf, 4); | |
2008 | next_inst = extract_unsigned_integer (buf, 4); | |
2009 | ||
2010 | /* Yow! */ | |
2011 | if (status != 0) | |
2012 | return pc; | |
2013 | ||
2014 | /* We've got to be read to handle the ldo before the fp register | |
2015 | save. */ | |
2016 | if ((inst & 0xfc000000) == 0x34000000 | |
2017 | && inst_saves_fr (next_inst) >= 4 | |
2018 | && inst_saves_fr (next_inst) <= 7) | |
2019 | { | |
2020 | /* So we drop into the code below in a reasonable state. */ | |
2021 | reg_num = inst_saves_fr (next_inst); | |
2022 | pc -= 4; | |
2023 | } | |
2024 | ||
2025 | /* Ugh. Also account for argument stores into the stack. | |
2026 | This is a kludge as on the HP compiler sets this bit and it | |
2027 | never does prologue scheduling. So once we see one, skip past | |
2028 | all of them. */ | |
2029 | if (reg_num >= 4 && reg_num <= 7) | |
2030 | { | |
2031 | while (reg_num >= 4 && reg_num <= 7) | |
2032 | { | |
2033 | pc += 8; | |
2034 | status = target_read_memory (pc, buf, 4); | |
2035 | inst = extract_unsigned_integer (buf, 4); | |
2036 | if (status != 0) | |
2037 | return pc; | |
2038 | if ((inst & 0xfc000000) != 0x34000000) | |
2039 | break; | |
2040 | status = target_read_memory (pc + 4, buf, 4); | |
2041 | next_inst = extract_unsigned_integer (buf, 4); | |
2042 | if (status != 0) | |
2043 | return pc; | |
2044 | reg_num = inst_saves_fr (next_inst); | |
2045 | } | |
2046 | args_stored = 0; | |
2047 | continue; | |
2048 | } | |
c598654a JL |
2049 | |
2050 | /* Quit if we hit any kind of branch. This can happen if a prologue | |
2051 | instruction is in the delay slot of the first call/branch. */ | |
2052 | if (is_branch (inst)) | |
2053 | break; | |
2054 | ||
edd86fb0 JL |
2055 | /* What a crock. The HP compilers set args_stored even if no |
2056 | arguments were stored into the stack (boo hiss). This could | |
2057 | cause this code to then skip a bunch of user insns (up to the | |
2058 | first branch). | |
2059 | ||
2060 | To combat this we try to identify when args_stored was bogusly | |
2061 | set and clear it. We only do this when args_stored is nonzero, | |
2062 | all other resources are accounted for, and nothing changed on | |
2063 | this pass. */ | |
2064 | if (args_stored | |
2065 | && ! (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) | |
2066 | && old_save_gr == save_gr && old_save_fr == save_fr | |
2067 | && old_save_rp == save_rp && old_save_sp == save_sp | |
2068 | && old_stack_remaining == stack_remaining) | |
2069 | break; | |
2070 | ||
c598654a JL |
2071 | /* Bump the PC. */ |
2072 | pc += 4; | |
66a1aa07 | 2073 | } |
66a1aa07 SG |
2074 | |
2075 | return pc; | |
2076 | } | |
2077 | ||
c598654a JL |
2078 | /* Put here the code to store, into a struct frame_saved_regs, |
2079 | the addresses of the saved registers of frame described by FRAME_INFO. | |
2080 | This includes special registers such as pc and fp saved in special | |
2081 | ways in the stack frame. sp is even more special: | |
2082 | the address we return for it IS the sp for the next frame. */ | |
2083 | ||
2084 | void | |
2085 | hppa_frame_find_saved_regs (frame_info, frame_saved_regs) | |
cb5f7128 | 2086 | struct frame_info *frame_info; |
c598654a JL |
2087 | struct frame_saved_regs *frame_saved_regs; |
2088 | { | |
2089 | CORE_ADDR pc; | |
2090 | struct unwind_table_entry *u; | |
2091 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; | |
2092 | int status, i, reg; | |
2093 | char buf[4]; | |
2094 | int fp_loc = -1; | |
2095 | ||
2096 | /* Zero out everything. */ | |
2097 | memset (frame_saved_regs, '\0', sizeof (struct frame_saved_regs)); | |
2098 | ||
2099 | /* Call dummy frames always look the same, so there's no need to | |
2100 | examine the dummy code to determine locations of saved registers; | |
2101 | instead, let find_dummy_frame_regs fill in the correct offsets | |
2102 | for the saved registers. */ | |
cb5f7128 JL |
2103 | if ((frame_info->pc >= frame_info->frame |
2104 | && frame_info->pc <= (frame_info->frame + CALL_DUMMY_LENGTH | |
2105 | + 32 * 4 + (NUM_REGS - FP0_REGNUM) * 8 | |
2106 | + 6 * 4))) | |
2107 | find_dummy_frame_regs (frame_info, frame_saved_regs); | |
c598654a | 2108 | |
70e43abe JL |
2109 | /* Interrupt handlers are special too. They lay out the register |
2110 | state in the exact same order as the register numbers in GDB. */ | |
cb5f7128 | 2111 | if (pc_in_interrupt_handler (frame_info->pc)) |
70e43abe JL |
2112 | { |
2113 | for (i = 0; i < NUM_REGS; i++) | |
2114 | { | |
2115 | /* SP is a little special. */ | |
2116 | if (i == SP_REGNUM) | |
2117 | frame_saved_regs->regs[SP_REGNUM] | |
cb5f7128 | 2118 | = read_memory_integer (frame_info->frame + SP_REGNUM * 4, 4); |
70e43abe | 2119 | else |
cb5f7128 | 2120 | frame_saved_regs->regs[i] = frame_info->frame + i * 4; |
70e43abe JL |
2121 | } |
2122 | return; | |
2123 | } | |
2124 | ||
2125 | /* Handle signal handler callers. */ | |
cb5f7128 | 2126 | if (frame_info->signal_handler_caller) |
70e43abe | 2127 | { |
cb5f7128 | 2128 | FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs); |
70e43abe JL |
2129 | return; |
2130 | } | |
2131 | ||
c598654a | 2132 | /* Get the starting address of the function referred to by the PC |
669caa9c | 2133 | saved in frame. */ |
cb5f7128 | 2134 | pc = get_pc_function_start (frame_info->pc); |
c598654a JL |
2135 | |
2136 | /* Yow! */ | |
2137 | u = find_unwind_entry (pc); | |
2138 | if (!u) | |
2139 | return; | |
2140 | ||
2141 | /* This is how much of a frame adjustment we need to account for. */ | |
2142 | stack_remaining = u->Total_frame_size << 3; | |
2143 | ||
2144 | /* Magic register saves we want to know about. */ | |
2145 | save_rp = u->Save_RP; | |
2146 | save_sp = u->Save_SP; | |
2147 | ||
2148 | /* Turn the Entry_GR field into a bitmask. */ | |
2149 | save_gr = 0; | |
2150 | for (i = 3; i < u->Entry_GR + 3; i++) | |
2151 | { | |
2152 | /* Frame pointer gets saved into a special location. */ | |
2153 | if (u->Save_SP && i == FP_REGNUM) | |
2154 | continue; | |
2155 | ||
2156 | save_gr |= (1 << i); | |
2157 | } | |
2158 | ||
2159 | /* Turn the Entry_FR field into a bitmask too. */ | |
2160 | save_fr = 0; | |
2161 | for (i = 12; i < u->Entry_FR + 12; i++) | |
2162 | save_fr |= (1 << i); | |
2163 | ||
70e43abe JL |
2164 | /* The frame always represents the value of %sp at entry to the |
2165 | current function (and is thus equivalent to the "saved" stack | |
2166 | pointer. */ | |
cb5f7128 | 2167 | frame_saved_regs->regs[SP_REGNUM] = frame_info->frame; |
70e43abe | 2168 | |
c598654a JL |
2169 | /* Loop until we find everything of interest or hit a branch. |
2170 | ||
2171 | For unoptimized GCC code and for any HP CC code this will never ever | |
2172 | examine any user instructions. | |
2173 | ||
2174 | For optimzied GCC code we're faced with problems. GCC will schedule | |
2175 | its prologue and make prologue instructions available for delay slot | |
2176 | filling. The end result is user code gets mixed in with the prologue | |
2177 | and a prologue instruction may be in the delay slot of the first branch | |
2178 | or call. | |
2179 | ||
2180 | Some unexpected things are expected with debugging optimized code, so | |
2181 | we allow this routine to walk past user instructions in optimized | |
2182 | GCC code. */ | |
2183 | while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) | |
2184 | { | |
2185 | status = target_read_memory (pc, buf, 4); | |
2186 | inst = extract_unsigned_integer (buf, 4); | |
2187 | ||
2188 | /* Yow! */ | |
2189 | if (status != 0) | |
2190 | return; | |
2191 | ||
2192 | /* Note the interesting effects of this instruction. */ | |
2193 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
2194 | ||
2195 | /* There is only one instruction used for saving RP into the stack. */ | |
2196 | if (inst == 0x6bc23fd9) | |
2197 | { | |
2198 | save_rp = 0; | |
cb5f7128 | 2199 | frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 20; |
c598654a JL |
2200 | } |
2201 | ||
70e43abe JL |
2202 | /* Just note that we found the save of SP into the stack. The |
2203 | value for frame_saved_regs was computed above. */ | |
c598654a | 2204 | if ((inst & 0xffffc000) == 0x6fc10000) |
70e43abe | 2205 | save_sp = 0; |
c598654a JL |
2206 | |
2207 | /* Account for general and floating-point register saves. */ | |
2208 | reg = inst_saves_gr (inst); | |
2209 | if (reg >= 3 && reg <= 18 | |
2210 | && (!u->Save_SP || reg != FP_REGNUM)) | |
2211 | { | |
2212 | save_gr &= ~(1 << reg); | |
2213 | ||
2214 | /* stwm with a positive displacement is a *post modify*. */ | |
2215 | if ((inst >> 26) == 0x1b | |
2216 | && extract_14 (inst) >= 0) | |
cb5f7128 | 2217 | frame_saved_regs->regs[reg] = frame_info->frame; |
c598654a JL |
2218 | else |
2219 | { | |
2220 | /* Handle code with and without frame pointers. */ | |
2221 | if (u->Save_SP) | |
2222 | frame_saved_regs->regs[reg] | |
cb5f7128 | 2223 | = frame_info->frame + extract_14 (inst); |
c598654a JL |
2224 | else |
2225 | frame_saved_regs->regs[reg] | |
cb5f7128 | 2226 | = frame_info->frame + (u->Total_frame_size << 3) |
c598654a JL |
2227 | + extract_14 (inst); |
2228 | } | |
2229 | } | |
2230 | ||
2231 | ||
2232 | /* GCC handles callee saved FP regs a little differently. | |
2233 | ||
2234 | It emits an instruction to put the value of the start of | |
2235 | the FP store area into %r1. It then uses fstds,ma with | |
2236 | a basereg of %r1 for the stores. | |
2237 | ||
2238 | HP CC emits them at the current stack pointer modifying | |
2239 | the stack pointer as it stores each register. */ | |
2240 | ||
2241 | /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */ | |
2242 | if ((inst & 0xffffc000) == 0x34610000 | |
2243 | || (inst & 0xffffc000) == 0x37c10000) | |
2244 | fp_loc = extract_14 (inst); | |
2245 | ||
2246 | reg = inst_saves_fr (inst); | |
2247 | if (reg >= 12 && reg <= 21) | |
2248 | { | |
2249 | /* Note +4 braindamage below is necessary because the FP status | |
2250 | registers are internally 8 registers rather than the expected | |
2251 | 4 registers. */ | |
2252 | save_fr &= ~(1 << reg); | |
2253 | if (fp_loc == -1) | |
2254 | { | |
2255 | /* 1st HP CC FP register store. After this instruction | |
2256 | we've set enough state that the GCC and HPCC code are | |
2257 | both handled in the same manner. */ | |
cb5f7128 | 2258 | frame_saved_regs->regs[reg + FP4_REGNUM + 4] = frame_info->frame; |
c598654a JL |
2259 | fp_loc = 8; |
2260 | } | |
2261 | else | |
2262 | { | |
2263 | frame_saved_regs->regs[reg + FP0_REGNUM + 4] | |
cb5f7128 | 2264 | = frame_info->frame + fp_loc; |
c598654a JL |
2265 | fp_loc += 8; |
2266 | } | |
2267 | } | |
2268 | ||
2269 | /* Quit if we hit any kind of branch. This can happen if a prologue | |
2270 | instruction is in the delay slot of the first call/branch. */ | |
2271 | if (is_branch (inst)) | |
2272 | break; | |
2273 | ||
2274 | /* Bump the PC. */ | |
2275 | pc += 4; | |
2276 | } | |
2277 | } | |
2278 | ||
63757ecd JK |
2279 | #ifdef MAINTENANCE_CMDS |
2280 | ||
66a1aa07 SG |
2281 | static void |
2282 | unwind_command (exp, from_tty) | |
2283 | char *exp; | |
2284 | int from_tty; | |
2285 | { | |
2286 | CORE_ADDR address; | |
2287 | union | |
2288 | { | |
2289 | int *foo; | |
2290 | struct unwind_table_entry *u; | |
2291 | } xxx; | |
2292 | ||
2293 | /* If we have an expression, evaluate it and use it as the address. */ | |
2294 | ||
2295 | if (exp != 0 && *exp != 0) | |
2296 | address = parse_and_eval_address (exp); | |
2297 | else | |
2298 | return; | |
2299 | ||
2300 | xxx.u = find_unwind_entry (address); | |
2301 | ||
2302 | if (!xxx.u) | |
2303 | { | |
199b2450 | 2304 | printf_unfiltered ("Can't find unwind table entry for PC 0x%x\n", address); |
66a1aa07 SG |
2305 | return; |
2306 | } | |
2307 | ||
199b2450 | 2308 | printf_unfiltered ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2], |
66a1aa07 SG |
2309 | xxx.foo[3]); |
2310 | } | |
976bb0be | 2311 | #endif /* MAINTENANCE_CMDS */ |
63757ecd JK |
2312 | |
2313 | void | |
2314 | _initialize_hppa_tdep () | |
2315 | { | |
976bb0be | 2316 | #ifdef MAINTENANCE_CMDS |
63757ecd JK |
2317 | add_cmd ("unwind", class_maintenance, unwind_command, |
2318 | "Print unwind table entry at given address.", | |
2319 | &maintenanceprintlist); | |
63757ecd | 2320 | #endif /* MAINTENANCE_CMDS */ |
976bb0be | 2321 | } |