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c906108c SS |
1 | /* Target-dependent code for the HP PA architecture, for GDB. |
2 | Copyright 1986, 87, 89, 90, 91, 92, 93, 94, 95, 96, 1999 | |
3 | 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 | ||
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
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. | |
c906108c | 14 | |
c5aa993b JM |
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. | |
c906108c | 19 | |
c5aa993b JM |
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., 59 Temple Place - Suite 330, | |
23 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "frame.h" | |
27 | #include "bfd.h" | |
28 | #include "inferior.h" | |
29 | #include "value.h" | |
30 | ||
31 | /* For argument passing to the inferior */ | |
32 | #include "symtab.h" | |
33 | ||
34 | #ifdef USG | |
35 | #include <sys/types.h> | |
36 | #endif | |
37 | ||
38 | #include <dl.h> | |
39 | #include <sys/param.h> | |
40 | #include <signal.h> | |
41 | ||
42 | #include <sys/ptrace.h> | |
43 | #include <machine/save_state.h> | |
44 | ||
45 | #ifdef COFF_ENCAPSULATE | |
46 | #include "a.out.encap.h" | |
47 | #else | |
48 | #endif | |
49 | ||
c5aa993b | 50 | /*#include <sys/user.h> After a.out.h */ |
c906108c SS |
51 | #include <sys/file.h> |
52 | #include "gdb_stat.h" | |
53 | #include "wait.h" | |
54 | ||
55 | #include "gdbcore.h" | |
56 | #include "gdbcmd.h" | |
57 | #include "target.h" | |
58 | #include "symfile.h" | |
59 | #include "objfiles.h" | |
60 | ||
61 | /* To support asking "What CPU is this?" */ | |
62 | #include <unistd.h> | |
63 | ||
64 | /* To support detection of the pseudo-initial frame | |
65 | that threads have. */ | |
66 | #define THREAD_INITIAL_FRAME_SYMBOL "__pthread_exit" | |
67 | #define THREAD_INITIAL_FRAME_SYM_LEN sizeof(THREAD_INITIAL_FRAME_SYMBOL) | |
c5aa993b | 68 | |
c906108c SS |
69 | static int extract_5_load PARAMS ((unsigned int)); |
70 | ||
71 | static unsigned extract_5R_store PARAMS ((unsigned int)); | |
72 | ||
73 | static unsigned extract_5r_store PARAMS ((unsigned int)); | |
74 | ||
75 | static void find_dummy_frame_regs PARAMS ((struct frame_info *, | |
76 | struct frame_saved_regs *)); | |
77 | ||
78 | static int find_proc_framesize PARAMS ((CORE_ADDR)); | |
79 | ||
80 | static int find_return_regnum PARAMS ((CORE_ADDR)); | |
81 | ||
82 | struct unwind_table_entry *find_unwind_entry PARAMS ((CORE_ADDR)); | |
83 | ||
84 | static int extract_17 PARAMS ((unsigned int)); | |
85 | ||
86 | static unsigned deposit_21 PARAMS ((unsigned int, unsigned int)); | |
87 | ||
88 | static int extract_21 PARAMS ((unsigned)); | |
89 | ||
90 | static unsigned deposit_14 PARAMS ((int, unsigned int)); | |
91 | ||
92 | static int extract_14 PARAMS ((unsigned)); | |
93 | ||
94 | static void unwind_command PARAMS ((char *, int)); | |
95 | ||
96 | static int low_sign_extend PARAMS ((unsigned int, unsigned int)); | |
97 | ||
98 | static int sign_extend PARAMS ((unsigned int, unsigned int)); | |
99 | ||
100 | static int restore_pc_queue PARAMS ((struct frame_saved_regs *)); | |
101 | ||
102 | static int hppa_alignof PARAMS ((struct type *)); | |
103 | ||
104 | /* To support multi-threading and stepping. */ | |
105 | int hppa_prepare_to_proceed PARAMS (()); | |
106 | ||
107 | static int prologue_inst_adjust_sp PARAMS ((unsigned long)); | |
108 | ||
109 | static int is_branch PARAMS ((unsigned long)); | |
110 | ||
111 | static int inst_saves_gr PARAMS ((unsigned long)); | |
112 | ||
113 | static int inst_saves_fr PARAMS ((unsigned long)); | |
114 | ||
115 | static int pc_in_interrupt_handler PARAMS ((CORE_ADDR)); | |
116 | ||
117 | static int pc_in_linker_stub PARAMS ((CORE_ADDR)); | |
118 | ||
119 | static int compare_unwind_entries PARAMS ((const void *, const void *)); | |
120 | ||
121 | static void read_unwind_info PARAMS ((struct objfile *)); | |
122 | ||
123 | static void internalize_unwinds PARAMS ((struct objfile *, | |
124 | struct unwind_table_entry *, | |
125 | asection *, unsigned int, | |
126 | unsigned int, CORE_ADDR)); | |
127 | static void pa_print_registers PARAMS ((char *, int, int)); | |
128 | static void pa_strcat_registers PARAMS ((char *, int, int, GDB_FILE *)); | |
129 | static void pa_register_look_aside PARAMS ((char *, int, long *)); | |
130 | static void pa_print_fp_reg PARAMS ((int)); | |
131 | static void pa_strcat_fp_reg PARAMS ((int, GDB_FILE *, enum precision_type)); | |
132 | ||
c5aa993b JM |
133 | typedef struct |
134 | { | |
135 | struct minimal_symbol *msym; | |
136 | CORE_ADDR solib_handle; | |
a0b3c4fd | 137 | CORE_ADDR return_val; |
c5aa993b JM |
138 | } |
139 | args_for_find_stub; | |
c906108c | 140 | |
a0b3c4fd | 141 | static int cover_find_stub_with_shl_get (PTR); |
c906108c | 142 | |
c5aa993b | 143 | static int is_pa_2 = 0; /* False */ |
c906108c | 144 | |
c5aa993b | 145 | /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */ |
c906108c SS |
146 | extern int hp_som_som_object_present; |
147 | ||
148 | /* In breakpoint.c */ | |
149 | extern int exception_catchpoints_are_fragile; | |
150 | ||
151 | /* This is defined in valops.c. */ | |
152 | extern value_ptr | |
c5aa993b | 153 | find_function_in_inferior PARAMS ((char *)); |
c906108c SS |
154 | |
155 | /* Should call_function allocate stack space for a struct return? */ | |
156 | int | |
157 | hppa_use_struct_convention (gcc_p, type) | |
158 | int gcc_p; | |
159 | struct type *type; | |
160 | { | |
161 | return (TYPE_LENGTH (type) > 8); | |
162 | } | |
c906108c | 163 | \f |
c5aa993b | 164 | |
c906108c SS |
165 | /* Routines to extract various sized constants out of hppa |
166 | instructions. */ | |
167 | ||
168 | /* This assumes that no garbage lies outside of the lower bits of | |
169 | value. */ | |
170 | ||
171 | static int | |
172 | sign_extend (val, bits) | |
173 | unsigned val, bits; | |
174 | { | |
c5aa993b | 175 | return (int) (val >> (bits - 1) ? (-1 << bits) | val : val); |
c906108c SS |
176 | } |
177 | ||
178 | /* For many immediate values the sign bit is the low bit! */ | |
179 | ||
180 | static int | |
181 | low_sign_extend (val, bits) | |
182 | unsigned val, bits; | |
183 | { | |
c5aa993b | 184 | return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1); |
c906108c SS |
185 | } |
186 | ||
187 | /* extract the immediate field from a ld{bhw}s instruction */ | |
188 | ||
189 | #if 0 | |
190 | ||
191 | unsigned | |
192 | get_field (val, from, to) | |
193 | unsigned val, from, to; | |
194 | { | |
195 | val = val >> 31 - to; | |
196 | return val & ((1 << 32 - from) - 1); | |
197 | } | |
198 | ||
199 | unsigned | |
200 | set_field (val, from, to, new_val) | |
201 | unsigned *val, from, to; | |
202 | { | |
203 | unsigned mask = ~((1 << (to - from + 1)) << (31 - from)); | |
204 | return *val = *val & mask | (new_val << (31 - from)); | |
205 | } | |
206 | ||
207 | /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */ | |
208 | ||
209 | int | |
210 | extract_3 (word) | |
211 | unsigned word; | |
212 | { | |
213 | return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17); | |
214 | } | |
215 | ||
216 | #endif | |
217 | ||
218 | static int | |
219 | extract_5_load (word) | |
220 | unsigned word; | |
221 | { | |
222 | return low_sign_extend (word >> 16 & MASK_5, 5); | |
223 | } | |
224 | ||
225 | #if 0 | |
226 | ||
227 | /* extract the immediate field from a st{bhw}s instruction */ | |
228 | ||
229 | int | |
230 | extract_5_store (word) | |
231 | unsigned word; | |
232 | { | |
233 | return low_sign_extend (word & MASK_5, 5); | |
234 | } | |
235 | ||
c5aa993b JM |
236 | #endif /* 0 */ |
237 | ||
c906108c SS |
238 | /* extract the immediate field from a break instruction */ |
239 | ||
240 | static unsigned | |
241 | extract_5r_store (word) | |
242 | unsigned word; | |
243 | { | |
244 | return (word & MASK_5); | |
245 | } | |
246 | ||
247 | /* extract the immediate field from a {sr}sm instruction */ | |
248 | ||
249 | static unsigned | |
250 | extract_5R_store (word) | |
251 | unsigned word; | |
252 | { | |
253 | return (word >> 16 & MASK_5); | |
254 | } | |
255 | ||
256 | /* extract an 11 bit immediate field */ | |
257 | ||
258 | #if 0 | |
259 | ||
260 | int | |
261 | extract_11 (word) | |
262 | unsigned word; | |
263 | { | |
264 | return low_sign_extend (word & MASK_11, 11); | |
265 | } | |
266 | ||
267 | #endif | |
268 | ||
269 | /* extract a 14 bit immediate field */ | |
270 | ||
271 | static int | |
272 | extract_14 (word) | |
273 | unsigned word; | |
274 | { | |
275 | return low_sign_extend (word & MASK_14, 14); | |
276 | } | |
277 | ||
278 | /* deposit a 14 bit constant in a word */ | |
279 | ||
280 | static unsigned | |
281 | deposit_14 (opnd, word) | |
282 | int opnd; | |
283 | unsigned word; | |
284 | { | |
285 | unsigned sign = (opnd < 0 ? 1 : 0); | |
286 | ||
c5aa993b | 287 | return word | ((unsigned) opnd << 1 & MASK_14) | sign; |
c906108c SS |
288 | } |
289 | ||
290 | /* extract a 21 bit constant */ | |
291 | ||
292 | static int | |
293 | extract_21 (word) | |
294 | unsigned word; | |
295 | { | |
296 | int val; | |
297 | ||
298 | word &= MASK_21; | |
299 | word <<= 11; | |
300 | val = GET_FIELD (word, 20, 20); | |
301 | val <<= 11; | |
302 | val |= GET_FIELD (word, 9, 19); | |
303 | val <<= 2; | |
304 | val |= GET_FIELD (word, 5, 6); | |
305 | val <<= 5; | |
306 | val |= GET_FIELD (word, 0, 4); | |
307 | val <<= 2; | |
308 | val |= GET_FIELD (word, 7, 8); | |
309 | return sign_extend (val, 21) << 11; | |
310 | } | |
311 | ||
312 | /* deposit a 21 bit constant in a word. Although 21 bit constants are | |
313 | usually the top 21 bits of a 32 bit constant, we assume that only | |
314 | the low 21 bits of opnd are relevant */ | |
315 | ||
316 | static unsigned | |
317 | deposit_21 (opnd, word) | |
318 | unsigned opnd, word; | |
319 | { | |
320 | unsigned val = 0; | |
321 | ||
322 | val |= GET_FIELD (opnd, 11 + 14, 11 + 18); | |
323 | val <<= 2; | |
324 | val |= GET_FIELD (opnd, 11 + 12, 11 + 13); | |
325 | val <<= 2; | |
326 | val |= GET_FIELD (opnd, 11 + 19, 11 + 20); | |
327 | val <<= 11; | |
328 | val |= GET_FIELD (opnd, 11 + 1, 11 + 11); | |
329 | val <<= 1; | |
330 | val |= GET_FIELD (opnd, 11 + 0, 11 + 0); | |
331 | return word | val; | |
332 | } | |
333 | ||
334 | /* extract a 12 bit constant from branch instructions */ | |
335 | ||
336 | #if 0 | |
337 | ||
338 | int | |
339 | extract_12 (word) | |
340 | unsigned word; | |
341 | { | |
342 | return sign_extend (GET_FIELD (word, 19, 28) | | |
343 | GET_FIELD (word, 29, 29) << 10 | | |
344 | (word & 0x1) << 11, 12) << 2; | |
345 | } | |
346 | ||
347 | /* Deposit a 17 bit constant in an instruction (like bl). */ | |
348 | ||
349 | unsigned int | |
350 | deposit_17 (opnd, word) | |
351 | unsigned opnd, word; | |
352 | { | |
c5aa993b JM |
353 | word |= GET_FIELD (opnd, 15 + 0, 15 + 0); /* w */ |
354 | word |= GET_FIELD (opnd, 15 + 1, 15 + 5) << 16; /* w1 */ | |
355 | word |= GET_FIELD (opnd, 15 + 6, 15 + 6) << 2; /* w2[10] */ | |
356 | word |= GET_FIELD (opnd, 15 + 7, 15 + 16) << 3; /* w2[0..9] */ | |
c906108c SS |
357 | |
358 | return word; | |
359 | } | |
360 | ||
361 | #endif | |
362 | ||
363 | /* extract a 17 bit constant from branch instructions, returning the | |
364 | 19 bit signed value. */ | |
365 | ||
366 | static int | |
367 | extract_17 (word) | |
368 | unsigned word; | |
369 | { | |
370 | return sign_extend (GET_FIELD (word, 19, 28) | | |
371 | GET_FIELD (word, 29, 29) << 10 | | |
372 | GET_FIELD (word, 11, 15) << 11 | | |
373 | (word & 0x1) << 16, 17) << 2; | |
374 | } | |
375 | \f | |
376 | ||
377 | /* Compare the start address for two unwind entries returning 1 if | |
378 | the first address is larger than the second, -1 if the second is | |
379 | larger than the first, and zero if they are equal. */ | |
380 | ||
381 | static int | |
382 | compare_unwind_entries (arg1, arg2) | |
383 | const void *arg1; | |
384 | const void *arg2; | |
385 | { | |
386 | const struct unwind_table_entry *a = arg1; | |
387 | const struct unwind_table_entry *b = arg2; | |
388 | ||
389 | if (a->region_start > b->region_start) | |
390 | return 1; | |
391 | else if (a->region_start < b->region_start) | |
392 | return -1; | |
393 | else | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static void | |
398 | internalize_unwinds (objfile, table, section, entries, size, text_offset) | |
399 | struct objfile *objfile; | |
400 | struct unwind_table_entry *table; | |
401 | asection *section; | |
402 | unsigned int entries, size; | |
403 | CORE_ADDR text_offset; | |
404 | { | |
405 | /* We will read the unwind entries into temporary memory, then | |
406 | fill in the actual unwind table. */ | |
407 | if (size > 0) | |
408 | { | |
409 | unsigned long tmp; | |
410 | unsigned i; | |
411 | char *buf = alloca (size); | |
412 | ||
413 | bfd_get_section_contents (objfile->obfd, section, buf, 0, size); | |
414 | ||
415 | /* Now internalize the information being careful to handle host/target | |
c5aa993b | 416 | endian issues. */ |
c906108c SS |
417 | for (i = 0; i < entries; i++) |
418 | { | |
419 | table[i].region_start = bfd_get_32 (objfile->obfd, | |
c5aa993b | 420 | (bfd_byte *) buf); |
c906108c SS |
421 | table[i].region_start += text_offset; |
422 | buf += 4; | |
c5aa993b | 423 | table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
424 | table[i].region_end += text_offset; |
425 | buf += 4; | |
c5aa993b | 426 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
427 | buf += 4; |
428 | table[i].Cannot_unwind = (tmp >> 31) & 0x1; | |
429 | table[i].Millicode = (tmp >> 30) & 0x1; | |
430 | table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1; | |
431 | table[i].Region_description = (tmp >> 27) & 0x3; | |
432 | table[i].reserved1 = (tmp >> 26) & 0x1; | |
433 | table[i].Entry_SR = (tmp >> 25) & 0x1; | |
434 | table[i].Entry_FR = (tmp >> 21) & 0xf; | |
435 | table[i].Entry_GR = (tmp >> 16) & 0x1f; | |
436 | table[i].Args_stored = (tmp >> 15) & 0x1; | |
437 | table[i].Variable_Frame = (tmp >> 14) & 0x1; | |
438 | table[i].Separate_Package_Body = (tmp >> 13) & 0x1; | |
439 | table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1; | |
440 | table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1; | |
441 | table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1; | |
442 | table[i].Ada_Region = (tmp >> 9) & 0x1; | |
443 | table[i].cxx_info = (tmp >> 8) & 0x1; | |
444 | table[i].cxx_try_catch = (tmp >> 7) & 0x1; | |
445 | table[i].sched_entry_seq = (tmp >> 6) & 0x1; | |
446 | table[i].reserved2 = (tmp >> 5) & 0x1; | |
447 | table[i].Save_SP = (tmp >> 4) & 0x1; | |
448 | table[i].Save_RP = (tmp >> 3) & 0x1; | |
449 | table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1; | |
450 | table[i].extn_ptr_defined = (tmp >> 1) & 0x1; | |
451 | table[i].Cleanup_defined = tmp & 0x1; | |
c5aa993b | 452 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
453 | buf += 4; |
454 | table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1; | |
455 | table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1; | |
456 | table[i].Large_frame = (tmp >> 29) & 0x1; | |
457 | table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1; | |
458 | table[i].reserved4 = (tmp >> 27) & 0x1; | |
459 | table[i].Total_frame_size = tmp & 0x7ffffff; | |
460 | ||
c5aa993b | 461 | /* Stub unwinds are handled elsewhere. */ |
c906108c SS |
462 | table[i].stub_unwind.stub_type = 0; |
463 | table[i].stub_unwind.padding = 0; | |
464 | } | |
465 | } | |
466 | } | |
467 | ||
468 | /* Read in the backtrace information stored in the `$UNWIND_START$' section of | |
469 | the object file. This info is used mainly by find_unwind_entry() to find | |
470 | out the stack frame size and frame pointer used by procedures. We put | |
471 | everything on the psymbol obstack in the objfile so that it automatically | |
472 | gets freed when the objfile is destroyed. */ | |
473 | ||
474 | static void | |
475 | read_unwind_info (objfile) | |
476 | struct objfile *objfile; | |
477 | { | |
478 | asection *unwind_sec, *elf_unwind_sec, *stub_unwind_sec; | |
479 | unsigned unwind_size, elf_unwind_size, stub_unwind_size, total_size; | |
480 | unsigned index, unwind_entries, elf_unwind_entries; | |
481 | unsigned stub_entries, total_entries; | |
482 | CORE_ADDR text_offset; | |
483 | struct obj_unwind_info *ui; | |
484 | obj_private_data_t *obj_private; | |
485 | ||
486 | text_offset = ANOFFSET (objfile->section_offsets, 0); | |
c5aa993b JM |
487 | ui = (struct obj_unwind_info *) obstack_alloc (&objfile->psymbol_obstack, |
488 | sizeof (struct obj_unwind_info)); | |
c906108c SS |
489 | |
490 | ui->table = NULL; | |
491 | ui->cache = NULL; | |
492 | ui->last = -1; | |
493 | ||
494 | /* Get hooks to all unwind sections. Note there is no linker-stub unwind | |
495 | section in ELF at the moment. */ | |
496 | unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_START$"); | |
497 | elf_unwind_sec = bfd_get_section_by_name (objfile->obfd, ".PARISC.unwind"); | |
498 | stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$"); | |
499 | ||
500 | /* Get sizes and unwind counts for all sections. */ | |
501 | if (unwind_sec) | |
502 | { | |
503 | unwind_size = bfd_section_size (objfile->obfd, unwind_sec); | |
504 | unwind_entries = unwind_size / UNWIND_ENTRY_SIZE; | |
505 | } | |
506 | else | |
507 | { | |
508 | unwind_size = 0; | |
509 | unwind_entries = 0; | |
510 | } | |
511 | ||
512 | if (elf_unwind_sec) | |
513 | { | |
c5aa993b JM |
514 | elf_unwind_size = bfd_section_size (objfile->obfd, elf_unwind_sec); /* purecov: deadcode */ |
515 | elf_unwind_entries = elf_unwind_size / UNWIND_ENTRY_SIZE; /* purecov: deadcode */ | |
c906108c SS |
516 | } |
517 | else | |
518 | { | |
519 | elf_unwind_size = 0; | |
520 | elf_unwind_entries = 0; | |
521 | } | |
522 | ||
523 | if (stub_unwind_sec) | |
524 | { | |
525 | stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec); | |
526 | stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE; | |
527 | } | |
528 | else | |
529 | { | |
530 | stub_unwind_size = 0; | |
531 | stub_entries = 0; | |
532 | } | |
533 | ||
534 | /* Compute total number of unwind entries and their total size. */ | |
535 | total_entries = unwind_entries + elf_unwind_entries + stub_entries; | |
536 | total_size = total_entries * sizeof (struct unwind_table_entry); | |
537 | ||
538 | /* Allocate memory for the unwind table. */ | |
539 | ui->table = (struct unwind_table_entry *) | |
540 | obstack_alloc (&objfile->psymbol_obstack, total_size); | |
c5aa993b | 541 | ui->last = total_entries - 1; |
c906108c SS |
542 | |
543 | /* Internalize the standard unwind entries. */ | |
544 | index = 0; | |
545 | internalize_unwinds (objfile, &ui->table[index], unwind_sec, | |
546 | unwind_entries, unwind_size, text_offset); | |
547 | index += unwind_entries; | |
548 | internalize_unwinds (objfile, &ui->table[index], elf_unwind_sec, | |
549 | elf_unwind_entries, elf_unwind_size, text_offset); | |
550 | index += elf_unwind_entries; | |
551 | ||
552 | /* Now internalize the stub unwind entries. */ | |
553 | if (stub_unwind_size > 0) | |
554 | { | |
555 | unsigned int i; | |
556 | char *buf = alloca (stub_unwind_size); | |
557 | ||
558 | /* Read in the stub unwind entries. */ | |
559 | bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf, | |
560 | 0, stub_unwind_size); | |
561 | ||
562 | /* Now convert them into regular unwind entries. */ | |
563 | for (i = 0; i < stub_entries; i++, index++) | |
564 | { | |
565 | /* Clear out the next unwind entry. */ | |
566 | memset (&ui->table[index], 0, sizeof (struct unwind_table_entry)); | |
567 | ||
568 | /* Convert offset & size into region_start and region_end. | |
569 | Stuff away the stub type into "reserved" fields. */ | |
570 | ui->table[index].region_start = bfd_get_32 (objfile->obfd, | |
571 | (bfd_byte *) buf); | |
572 | ui->table[index].region_start += text_offset; | |
573 | buf += 4; | |
574 | ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd, | |
c5aa993b | 575 | (bfd_byte *) buf); |
c906108c SS |
576 | buf += 2; |
577 | ui->table[index].region_end | |
c5aa993b JM |
578 | = ui->table[index].region_start + 4 * |
579 | (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1); | |
c906108c SS |
580 | buf += 2; |
581 | } | |
582 | ||
583 | } | |
584 | ||
585 | /* Unwind table needs to be kept sorted. */ | |
586 | qsort (ui->table, total_entries, sizeof (struct unwind_table_entry), | |
587 | compare_unwind_entries); | |
588 | ||
589 | /* Keep a pointer to the unwind information. */ | |
c5aa993b | 590 | if (objfile->obj_private == NULL) |
c906108c SS |
591 | { |
592 | obj_private = (obj_private_data_t *) | |
c5aa993b JM |
593 | obstack_alloc (&objfile->psymbol_obstack, |
594 | sizeof (obj_private_data_t)); | |
c906108c | 595 | obj_private->unwind_info = NULL; |
c5aa993b JM |
596 | obj_private->so_info = NULL; |
597 | ||
c906108c SS |
598 | objfile->obj_private = (PTR) obj_private; |
599 | } | |
c5aa993b | 600 | obj_private = (obj_private_data_t *) objfile->obj_private; |
c906108c SS |
601 | obj_private->unwind_info = ui; |
602 | } | |
603 | ||
604 | /* Lookup the unwind (stack backtrace) info for the given PC. We search all | |
605 | of the objfiles seeking the unwind table entry for this PC. Each objfile | |
606 | contains a sorted list of struct unwind_table_entry. Since we do a binary | |
607 | search of the unwind tables, we depend upon them to be sorted. */ | |
608 | ||
609 | struct unwind_table_entry * | |
c5aa993b | 610 | find_unwind_entry (pc) |
c906108c SS |
611 | CORE_ADDR pc; |
612 | { | |
613 | int first, middle, last; | |
614 | struct objfile *objfile; | |
615 | ||
616 | /* A function at address 0? Not in HP-UX! */ | |
617 | if (pc == (CORE_ADDR) 0) | |
618 | return NULL; | |
619 | ||
620 | ALL_OBJFILES (objfile) | |
c5aa993b JM |
621 | { |
622 | struct obj_unwind_info *ui; | |
623 | ui = NULL; | |
624 | if (objfile->obj_private) | |
625 | ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info; | |
c906108c | 626 | |
c5aa993b JM |
627 | if (!ui) |
628 | { | |
629 | read_unwind_info (objfile); | |
630 | if (objfile->obj_private == NULL) | |
631 | error ("Internal error reading unwind information."); /* purecov: deadcode */ | |
632 | ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info; | |
633 | } | |
c906108c | 634 | |
c5aa993b | 635 | /* First, check the cache */ |
c906108c | 636 | |
c5aa993b JM |
637 | if (ui->cache |
638 | && pc >= ui->cache->region_start | |
639 | && pc <= ui->cache->region_end) | |
640 | return ui->cache; | |
c906108c | 641 | |
c5aa993b | 642 | /* Not in the cache, do a binary search */ |
c906108c | 643 | |
c5aa993b JM |
644 | first = 0; |
645 | last = ui->last; | |
c906108c | 646 | |
c5aa993b JM |
647 | while (first <= last) |
648 | { | |
649 | middle = (first + last) / 2; | |
650 | if (pc >= ui->table[middle].region_start | |
651 | && pc <= ui->table[middle].region_end) | |
652 | { | |
653 | ui->cache = &ui->table[middle]; | |
654 | return &ui->table[middle]; | |
655 | } | |
c906108c | 656 | |
c5aa993b JM |
657 | if (pc < ui->table[middle].region_start) |
658 | last = middle - 1; | |
659 | else | |
660 | first = middle + 1; | |
661 | } | |
662 | } /* ALL_OBJFILES() */ | |
c906108c SS |
663 | return NULL; |
664 | } | |
665 | ||
666 | /* Return the adjustment necessary to make for addresses on the stack | |
667 | as presented by hpread.c. | |
668 | ||
669 | This is necessary because of the stack direction on the PA and the | |
670 | bizarre way in which someone (?) decided they wanted to handle | |
671 | frame pointerless code in GDB. */ | |
672 | int | |
673 | hpread_adjust_stack_address (func_addr) | |
674 | CORE_ADDR func_addr; | |
675 | { | |
676 | struct unwind_table_entry *u; | |
677 | ||
678 | u = find_unwind_entry (func_addr); | |
679 | if (!u) | |
680 | return 0; | |
681 | else | |
682 | return u->Total_frame_size << 3; | |
683 | } | |
684 | ||
685 | /* Called to determine if PC is in an interrupt handler of some | |
686 | kind. */ | |
687 | ||
688 | static int | |
689 | pc_in_interrupt_handler (pc) | |
690 | CORE_ADDR pc; | |
691 | { | |
692 | struct unwind_table_entry *u; | |
693 | struct minimal_symbol *msym_us; | |
694 | ||
695 | u = find_unwind_entry (pc); | |
696 | if (!u) | |
697 | return 0; | |
698 | ||
699 | /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though | |
700 | its frame isn't a pure interrupt frame. Deal with this. */ | |
701 | msym_us = lookup_minimal_symbol_by_pc (pc); | |
702 | ||
703 | return u->HP_UX_interrupt_marker && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)); | |
704 | } | |
705 | ||
706 | /* Called when no unwind descriptor was found for PC. Returns 1 if it | |
707 | appears that PC is in a linker stub. */ | |
708 | ||
709 | static int | |
710 | pc_in_linker_stub (pc) | |
711 | CORE_ADDR pc; | |
712 | { | |
713 | int found_magic_instruction = 0; | |
714 | int i; | |
715 | char buf[4]; | |
716 | ||
717 | /* If unable to read memory, assume pc is not in a linker stub. */ | |
718 | if (target_read_memory (pc, buf, 4) != 0) | |
719 | return 0; | |
720 | ||
721 | /* We are looking for something like | |
722 | ||
723 | ; $$dyncall jams RP into this special spot in the frame (RP') | |
724 | ; before calling the "call stub" | |
725 | ldw -18(sp),rp | |
726 | ||
727 | ldsid (rp),r1 ; Get space associated with RP into r1 | |
728 | mtsp r1,sp ; Move it into space register 0 | |
729 | be,n 0(sr0),rp) ; back to your regularly scheduled program */ | |
730 | ||
731 | /* Maximum known linker stub size is 4 instructions. Search forward | |
732 | from the given PC, then backward. */ | |
733 | for (i = 0; i < 4; i++) | |
734 | { | |
735 | /* If we hit something with an unwind, stop searching this direction. */ | |
736 | ||
737 | if (find_unwind_entry (pc + i * 4) != 0) | |
738 | break; | |
739 | ||
740 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
c5aa993b | 741 | return from a cross-space function call. */ |
c906108c SS |
742 | if (read_memory_integer (pc + i * 4, 4) == 0x004010a1) |
743 | { | |
744 | found_magic_instruction = 1; | |
745 | break; | |
746 | } | |
747 | /* Add code to handle long call/branch and argument relocation stubs | |
c5aa993b | 748 | here. */ |
c906108c SS |
749 | } |
750 | ||
751 | if (found_magic_instruction != 0) | |
752 | return 1; | |
753 | ||
754 | /* Now look backward. */ | |
755 | for (i = 0; i < 4; i++) | |
756 | { | |
757 | /* If we hit something with an unwind, stop searching this direction. */ | |
758 | ||
759 | if (find_unwind_entry (pc - i * 4) != 0) | |
760 | break; | |
761 | ||
762 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
c5aa993b | 763 | return from a cross-space function call. */ |
c906108c SS |
764 | if (read_memory_integer (pc - i * 4, 4) == 0x004010a1) |
765 | { | |
766 | found_magic_instruction = 1; | |
767 | break; | |
768 | } | |
769 | /* Add code to handle long call/branch and argument relocation stubs | |
c5aa993b | 770 | here. */ |
c906108c SS |
771 | } |
772 | return found_magic_instruction; | |
773 | } | |
774 | ||
775 | static int | |
c5aa993b | 776 | find_return_regnum (pc) |
c906108c SS |
777 | CORE_ADDR pc; |
778 | { | |
779 | struct unwind_table_entry *u; | |
780 | ||
781 | u = find_unwind_entry (pc); | |
782 | ||
783 | if (!u) | |
784 | return RP_REGNUM; | |
785 | ||
786 | if (u->Millicode) | |
787 | return 31; | |
788 | ||
789 | return RP_REGNUM; | |
790 | } | |
791 | ||
792 | /* Return size of frame, or -1 if we should use a frame pointer. */ | |
793 | static int | |
794 | find_proc_framesize (pc) | |
795 | CORE_ADDR pc; | |
796 | { | |
797 | struct unwind_table_entry *u; | |
798 | struct minimal_symbol *msym_us; | |
799 | ||
800 | /* This may indicate a bug in our callers... */ | |
c5aa993b | 801 | if (pc == (CORE_ADDR) 0) |
c906108c | 802 | return -1; |
c5aa993b | 803 | |
c906108c SS |
804 | u = find_unwind_entry (pc); |
805 | ||
806 | if (!u) | |
807 | { | |
808 | if (pc_in_linker_stub (pc)) | |
809 | /* Linker stubs have a zero size frame. */ | |
810 | return 0; | |
811 | else | |
812 | return -1; | |
813 | } | |
814 | ||
815 | msym_us = lookup_minimal_symbol_by_pc (pc); | |
816 | ||
817 | /* If Save_SP is set, and we're not in an interrupt or signal caller, | |
818 | then we have a frame pointer. Use it. */ | |
819 | if (u->Save_SP && !pc_in_interrupt_handler (pc) | |
820 | && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us))) | |
821 | return -1; | |
822 | ||
823 | return u->Total_frame_size << 3; | |
824 | } | |
825 | ||
826 | /* Return offset from sp at which rp is saved, or 0 if not saved. */ | |
827 | static int rp_saved PARAMS ((CORE_ADDR)); | |
828 | ||
829 | static int | |
830 | rp_saved (pc) | |
831 | CORE_ADDR pc; | |
832 | { | |
833 | struct unwind_table_entry *u; | |
834 | ||
835 | /* A function at, and thus a return PC from, address 0? Not in HP-UX! */ | |
836 | if (pc == (CORE_ADDR) 0) | |
837 | return 0; | |
838 | ||
839 | u = find_unwind_entry (pc); | |
840 | ||
841 | if (!u) | |
842 | { | |
843 | if (pc_in_linker_stub (pc)) | |
844 | /* This is the so-called RP'. */ | |
845 | return -24; | |
846 | else | |
847 | return 0; | |
848 | } | |
849 | ||
850 | if (u->Save_RP) | |
851 | return -20; | |
852 | else if (u->stub_unwind.stub_type != 0) | |
853 | { | |
854 | switch (u->stub_unwind.stub_type) | |
855 | { | |
856 | case EXPORT: | |
857 | case IMPORT: | |
858 | return -24; | |
859 | case PARAMETER_RELOCATION: | |
860 | return -8; | |
861 | default: | |
862 | return 0; | |
863 | } | |
864 | } | |
865 | else | |
866 | return 0; | |
867 | } | |
868 | \f | |
869 | int | |
870 | frameless_function_invocation (frame) | |
871 | struct frame_info *frame; | |
872 | { | |
873 | struct unwind_table_entry *u; | |
874 | ||
875 | u = find_unwind_entry (frame->pc); | |
876 | ||
877 | if (u == 0) | |
878 | return 0; | |
879 | ||
880 | return (u->Total_frame_size == 0 && u->stub_unwind.stub_type == 0); | |
881 | } | |
882 | ||
883 | CORE_ADDR | |
884 | saved_pc_after_call (frame) | |
885 | struct frame_info *frame; | |
886 | { | |
887 | int ret_regnum; | |
888 | CORE_ADDR pc; | |
889 | struct unwind_table_entry *u; | |
890 | ||
891 | ret_regnum = find_return_regnum (get_frame_pc (frame)); | |
892 | pc = read_register (ret_regnum) & ~0x3; | |
c5aa993b | 893 | |
c906108c SS |
894 | /* If PC is in a linker stub, then we need to dig the address |
895 | the stub will return to out of the stack. */ | |
896 | u = find_unwind_entry (pc); | |
897 | if (u && u->stub_unwind.stub_type != 0) | |
898 | return FRAME_SAVED_PC (frame); | |
899 | else | |
900 | return pc; | |
901 | } | |
902 | \f | |
903 | CORE_ADDR | |
904 | hppa_frame_saved_pc (frame) | |
905 | struct frame_info *frame; | |
906 | { | |
907 | CORE_ADDR pc = get_frame_pc (frame); | |
908 | struct unwind_table_entry *u; | |
909 | CORE_ADDR old_pc; | |
c5aa993b JM |
910 | int spun_around_loop = 0; |
911 | int rp_offset = 0; | |
c906108c SS |
912 | |
913 | /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner | |
914 | at the base of the frame in an interrupt handler. Registers within | |
915 | are saved in the exact same order as GDB numbers registers. How | |
916 | convienent. */ | |
917 | if (pc_in_interrupt_handler (pc)) | |
918 | return read_memory_integer (frame->frame + PC_REGNUM * 4, 4) & ~0x3; | |
919 | ||
920 | #ifdef FRAME_SAVED_PC_IN_SIGTRAMP | |
921 | /* Deal with signal handler caller frames too. */ | |
922 | if (frame->signal_handler_caller) | |
923 | { | |
924 | CORE_ADDR rp; | |
925 | FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp); | |
926 | return rp & ~0x3; | |
927 | } | |
928 | #endif | |
929 | ||
930 | if (frameless_function_invocation (frame)) | |
931 | { | |
932 | int ret_regnum; | |
933 | ||
934 | ret_regnum = find_return_regnum (pc); | |
935 | ||
936 | /* If the next frame is an interrupt frame or a signal | |
c5aa993b JM |
937 | handler caller, then we need to look in the saved |
938 | register area to get the return pointer (the values | |
939 | in the registers may not correspond to anything useful). */ | |
940 | if (frame->next | |
c906108c SS |
941 | && (frame->next->signal_handler_caller |
942 | || pc_in_interrupt_handler (frame->next->pc))) | |
943 | { | |
944 | struct frame_saved_regs saved_regs; | |
945 | ||
946 | get_frame_saved_regs (frame->next, &saved_regs); | |
947 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4) & 0x2) | |
948 | { | |
949 | pc = read_memory_integer (saved_regs.regs[31], 4) & ~0x3; | |
950 | ||
951 | /* Syscalls are really two frames. The syscall stub itself | |
c5aa993b JM |
952 | with a return pointer in %rp and the kernel call with |
953 | a return pointer in %r31. We return the %rp variant | |
954 | if %r31 is the same as frame->pc. */ | |
c906108c SS |
955 | if (pc == frame->pc) |
956 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; | |
957 | } | |
958 | else | |
959 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; | |
960 | } | |
961 | else | |
962 | pc = read_register (ret_regnum) & ~0x3; | |
963 | } | |
964 | else | |
965 | { | |
966 | spun_around_loop = 0; | |
c5aa993b | 967 | old_pc = pc; |
c906108c | 968 | |
c5aa993b | 969 | restart: |
c906108c SS |
970 | rp_offset = rp_saved (pc); |
971 | ||
972 | /* Similar to code in frameless function case. If the next | |
c5aa993b JM |
973 | frame is a signal or interrupt handler, then dig the right |
974 | information out of the saved register info. */ | |
c906108c SS |
975 | if (rp_offset == 0 |
976 | && frame->next | |
977 | && (frame->next->signal_handler_caller | |
978 | || pc_in_interrupt_handler (frame->next->pc))) | |
979 | { | |
980 | struct frame_saved_regs saved_regs; | |
981 | ||
982 | get_frame_saved_regs (frame->next, &saved_regs); | |
983 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4) & 0x2) | |
984 | { | |
985 | pc = read_memory_integer (saved_regs.regs[31], 4) & ~0x3; | |
986 | ||
987 | /* Syscalls are really two frames. The syscall stub itself | |
c5aa993b JM |
988 | with a return pointer in %rp and the kernel call with |
989 | a return pointer in %r31. We return the %rp variant | |
990 | if %r31 is the same as frame->pc. */ | |
c906108c SS |
991 | if (pc == frame->pc) |
992 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; | |
993 | } | |
994 | else | |
995 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~0x3; | |
996 | } | |
997 | else if (rp_offset == 0) | |
c5aa993b JM |
998 | { |
999 | old_pc = pc; | |
1000 | pc = read_register (RP_REGNUM) & ~0x3; | |
1001 | } | |
c906108c | 1002 | else |
c5aa993b JM |
1003 | { |
1004 | old_pc = pc; | |
1005 | pc = read_memory_integer (frame->frame + rp_offset, 4) & ~0x3; | |
1006 | } | |
c906108c SS |
1007 | } |
1008 | ||
1009 | /* If PC is inside a linker stub, then dig out the address the stub | |
1010 | will return to. | |
1011 | ||
1012 | Don't do this for long branch stubs. Why? For some unknown reason | |
1013 | _start is marked as a long branch stub in hpux10. */ | |
1014 | u = find_unwind_entry (pc); | |
1015 | if (u && u->stub_unwind.stub_type != 0 | |
1016 | && u->stub_unwind.stub_type != LONG_BRANCH) | |
1017 | { | |
1018 | unsigned int insn; | |
1019 | ||
1020 | /* If this is a dynamic executable, and we're in a signal handler, | |
c5aa993b JM |
1021 | then the call chain will eventually point us into the stub for |
1022 | _sigreturn. Unlike most cases, we'll be pointed to the branch | |
1023 | to the real sigreturn rather than the code after the real branch!. | |
c906108c | 1024 | |
c5aa993b JM |
1025 | Else, try to dig the address the stub will return to in the normal |
1026 | fashion. */ | |
c906108c SS |
1027 | insn = read_memory_integer (pc, 4); |
1028 | if ((insn & 0xfc00e000) == 0xe8000000) | |
1029 | return (pc + extract_17 (insn) + 8) & ~0x3; | |
1030 | else | |
1031 | { | |
c5aa993b JM |
1032 | if (old_pc == pc) |
1033 | spun_around_loop++; | |
1034 | ||
1035 | if (spun_around_loop > 1) | |
1036 | { | |
1037 | /* We're just about to go around the loop again with | |
1038 | no more hope of success. Die. */ | |
1039 | error ("Unable to find return pc for this frame"); | |
1040 | } | |
1041 | else | |
1042 | goto restart; | |
c906108c SS |
1043 | } |
1044 | } | |
1045 | ||
1046 | return pc; | |
1047 | } | |
1048 | \f | |
1049 | /* We need to correct the PC and the FP for the outermost frame when we are | |
1050 | in a system call. */ | |
1051 | ||
1052 | void | |
1053 | init_extra_frame_info (fromleaf, frame) | |
1054 | int fromleaf; | |
1055 | struct frame_info *frame; | |
1056 | { | |
1057 | int flags; | |
1058 | int framesize; | |
1059 | ||
1060 | if (frame->next && !fromleaf) | |
1061 | return; | |
1062 | ||
1063 | /* If the next frame represents a frameless function invocation | |
1064 | then we have to do some adjustments that are normally done by | |
1065 | FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */ | |
1066 | if (fromleaf) | |
1067 | { | |
1068 | /* Find the framesize of *this* frame without peeking at the PC | |
c5aa993b | 1069 | in the current frame structure (it isn't set yet). */ |
c906108c SS |
1070 | framesize = find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame))); |
1071 | ||
1072 | /* Now adjust our base frame accordingly. If we have a frame pointer | |
c5aa993b JM |
1073 | use it, else subtract the size of this frame from the current |
1074 | frame. (we always want frame->frame to point at the lowest address | |
1075 | in the frame). */ | |
c906108c SS |
1076 | if (framesize == -1) |
1077 | frame->frame = TARGET_READ_FP (); | |
1078 | else | |
1079 | frame->frame -= framesize; | |
1080 | return; | |
1081 | } | |
1082 | ||
1083 | flags = read_register (FLAGS_REGNUM); | |
c5aa993b | 1084 | if (flags & 2) /* In system call? */ |
c906108c SS |
1085 | frame->pc = read_register (31) & ~0x3; |
1086 | ||
1087 | /* The outermost frame is always derived from PC-framesize | |
1088 | ||
1089 | One might think frameless innermost frames should have | |
1090 | a frame->frame that is the same as the parent's frame->frame. | |
1091 | That is wrong; frame->frame in that case should be the *high* | |
1092 | address of the parent's frame. It's complicated as hell to | |
1093 | explain, but the parent *always* creates some stack space for | |
1094 | the child. So the child actually does have a frame of some | |
1095 | sorts, and its base is the high address in its parent's frame. */ | |
c5aa993b | 1096 | framesize = find_proc_framesize (frame->pc); |
c906108c SS |
1097 | if (framesize == -1) |
1098 | frame->frame = TARGET_READ_FP (); | |
1099 | else | |
1100 | frame->frame = read_register (SP_REGNUM) - framesize; | |
1101 | } | |
1102 | \f | |
1103 | /* Given a GDB frame, determine the address of the calling function's frame. | |
1104 | This will be used to create a new GDB frame struct, and then | |
1105 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
1106 | ||
1107 | This may involve searching through prologues for several functions | |
1108 | at boundaries where GCC calls HP C code, or where code which has | |
1109 | a frame pointer calls code without a frame pointer. */ | |
1110 | ||
1111 | CORE_ADDR | |
1112 | frame_chain (frame) | |
1113 | struct frame_info *frame; | |
1114 | { | |
1115 | int my_framesize, caller_framesize; | |
1116 | struct unwind_table_entry *u; | |
1117 | CORE_ADDR frame_base; | |
1118 | struct frame_info *tmp_frame; | |
1119 | ||
c5aa993b | 1120 | CORE_ADDR caller_pc; |
c906108c SS |
1121 | |
1122 | struct minimal_symbol *min_frame_symbol; | |
c5aa993b JM |
1123 | struct symbol *frame_symbol; |
1124 | char *frame_symbol_name; | |
c906108c SS |
1125 | |
1126 | /* If this is a threaded application, and we see the | |
1127 | routine "__pthread_exit", treat it as the stack root | |
1128 | for this thread. */ | |
c5aa993b JM |
1129 | min_frame_symbol = lookup_minimal_symbol_by_pc (frame->pc); |
1130 | frame_symbol = find_pc_function (frame->pc); | |
c906108c | 1131 | |
c5aa993b | 1132 | if ((min_frame_symbol != 0) /* && (frame_symbol == 0) */ ) |
c906108c | 1133 | { |
c5aa993b JM |
1134 | /* The test above for "no user function name" would defend |
1135 | against the slim likelihood that a user might define a | |
1136 | routine named "__pthread_exit" and then try to debug it. | |
1137 | ||
1138 | If it weren't commented out, and you tried to debug the | |
1139 | pthread library itself, you'd get errors. | |
1140 | ||
1141 | So for today, we don't make that check. */ | |
1142 | frame_symbol_name = SYMBOL_NAME (min_frame_symbol); | |
1143 | if (frame_symbol_name != 0) | |
1144 | { | |
1145 | if (0 == strncmp (frame_symbol_name, | |
1146 | THREAD_INITIAL_FRAME_SYMBOL, | |
1147 | THREAD_INITIAL_FRAME_SYM_LEN)) | |
1148 | { | |
1149 | /* Pretend we've reached the bottom of the stack. */ | |
1150 | return (CORE_ADDR) 0; | |
1151 | } | |
1152 | } | |
1153 | } /* End of hacky code for threads. */ | |
1154 | ||
c906108c SS |
1155 | /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These |
1156 | are easy; at *sp we have a full save state strucutre which we can | |
1157 | pull the old stack pointer from. Also see frame_saved_pc for | |
1158 | code to dig a saved PC out of the save state structure. */ | |
1159 | if (pc_in_interrupt_handler (frame->pc)) | |
1160 | frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4, 4); | |
1161 | #ifdef FRAME_BASE_BEFORE_SIGTRAMP | |
1162 | else if (frame->signal_handler_caller) | |
1163 | { | |
1164 | FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base); | |
1165 | } | |
1166 | #endif | |
1167 | else | |
1168 | frame_base = frame->frame; | |
1169 | ||
1170 | /* Get frame sizes for the current frame and the frame of the | |
1171 | caller. */ | |
1172 | my_framesize = find_proc_framesize (frame->pc); | |
c5aa993b | 1173 | caller_pc = FRAME_SAVED_PC (frame); |
c906108c SS |
1174 | |
1175 | /* If we can't determine the caller's PC, then it's not likely we can | |
1176 | really determine anything meaningful about its frame. We'll consider | |
1177 | this to be stack bottom. */ | |
1178 | if (caller_pc == (CORE_ADDR) 0) | |
1179 | return (CORE_ADDR) 0; | |
1180 | ||
c5aa993b | 1181 | caller_framesize = find_proc_framesize (FRAME_SAVED_PC (frame)); |
c906108c SS |
1182 | |
1183 | /* If caller does not have a frame pointer, then its frame | |
1184 | can be found at current_frame - caller_framesize. */ | |
1185 | if (caller_framesize != -1) | |
1186 | { | |
1187 | return frame_base - caller_framesize; | |
1188 | } | |
1189 | /* Both caller and callee have frame pointers and are GCC compiled | |
1190 | (SAVE_SP bit in unwind descriptor is on for both functions. | |
1191 | The previous frame pointer is found at the top of the current frame. */ | |
1192 | if (caller_framesize == -1 && my_framesize == -1) | |
1193 | { | |
1194 | return read_memory_integer (frame_base, 4); | |
1195 | } | |
1196 | /* Caller has a frame pointer, but callee does not. This is a little | |
1197 | more difficult as GCC and HP C lay out locals and callee register save | |
1198 | areas very differently. | |
1199 | ||
1200 | The previous frame pointer could be in a register, or in one of | |
1201 | several areas on the stack. | |
1202 | ||
1203 | Walk from the current frame to the innermost frame examining | |
1204 | unwind descriptors to determine if %r3 ever gets saved into the | |
1205 | stack. If so return whatever value got saved into the stack. | |
1206 | If it was never saved in the stack, then the value in %r3 is still | |
1207 | valid, so use it. | |
1208 | ||
1209 | We use information from unwind descriptors to determine if %r3 | |
1210 | is saved into the stack (Entry_GR field has this information). */ | |
1211 | ||
1212 | tmp_frame = frame; | |
1213 | while (tmp_frame) | |
1214 | { | |
1215 | u = find_unwind_entry (tmp_frame->pc); | |
1216 | ||
1217 | if (!u) | |
1218 | { | |
1219 | /* We could find this information by examining prologues. I don't | |
1220 | think anyone has actually written any tools (not even "strip") | |
1221 | which leave them out of an executable, so maybe this is a moot | |
1222 | point. */ | |
c5aa993b JM |
1223 | /* ??rehrauer: Actually, it's quite possible to stepi your way into |
1224 | code that doesn't have unwind entries. For example, stepping into | |
1225 | the dynamic linker will give you a PC that has none. Thus, I've | |
1226 | disabled this warning. */ | |
c906108c SS |
1227 | #if 0 |
1228 | warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc); | |
1229 | #endif | |
1230 | return (CORE_ADDR) 0; | |
1231 | } | |
1232 | ||
1233 | /* Entry_GR specifies the number of callee-saved general registers | |
c5aa993b | 1234 | saved in the stack. It starts at %r3, so %r3 would be 1. */ |
c906108c SS |
1235 | if (u->Entry_GR >= 1 || u->Save_SP |
1236 | || tmp_frame->signal_handler_caller | |
1237 | || pc_in_interrupt_handler (tmp_frame->pc)) | |
1238 | break; | |
1239 | else | |
1240 | tmp_frame = tmp_frame->next; | |
1241 | } | |
1242 | ||
1243 | if (tmp_frame) | |
1244 | { | |
1245 | /* We may have walked down the chain into a function with a frame | |
c5aa993b | 1246 | pointer. */ |
c906108c SS |
1247 | if (u->Save_SP |
1248 | && !tmp_frame->signal_handler_caller | |
1249 | && !pc_in_interrupt_handler (tmp_frame->pc)) | |
1250 | { | |
1251 | return read_memory_integer (tmp_frame->frame, 4); | |
1252 | } | |
1253 | /* %r3 was saved somewhere in the stack. Dig it out. */ | |
c5aa993b | 1254 | else |
c906108c SS |
1255 | { |
1256 | struct frame_saved_regs saved_regs; | |
1257 | ||
1258 | /* Sick. | |
1259 | ||
1260 | For optimization purposes many kernels don't have the | |
1261 | callee saved registers into the save_state structure upon | |
1262 | entry into the kernel for a syscall; the optimization | |
1263 | is usually turned off if the process is being traced so | |
1264 | that the debugger can get full register state for the | |
1265 | process. | |
c5aa993b | 1266 | |
c906108c SS |
1267 | This scheme works well except for two cases: |
1268 | ||
c5aa993b JM |
1269 | * Attaching to a process when the process is in the |
1270 | kernel performing a system call (debugger can't get | |
1271 | full register state for the inferior process since | |
1272 | the process wasn't being traced when it entered the | |
1273 | system call). | |
c906108c | 1274 | |
c5aa993b JM |
1275 | * Register state is not complete if the system call |
1276 | causes the process to core dump. | |
c906108c SS |
1277 | |
1278 | ||
1279 | The following heinous code is an attempt to deal with | |
1280 | the lack of register state in a core dump. It will | |
1281 | fail miserably if the function which performs the | |
1282 | system call has a variable sized stack frame. */ | |
1283 | ||
1284 | get_frame_saved_regs (tmp_frame, &saved_regs); | |
1285 | ||
1286 | /* Abominable hack. */ | |
1287 | if (current_target.to_has_execution == 0 | |
1288 | && ((saved_regs.regs[FLAGS_REGNUM] | |
c5aa993b | 1289 | && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4) |
c906108c SS |
1290 | & 0x2)) |
1291 | || (saved_regs.regs[FLAGS_REGNUM] == 0 | |
1292 | && read_register (FLAGS_REGNUM) & 0x2))) | |
1293 | { | |
1294 | u = find_unwind_entry (FRAME_SAVED_PC (frame)); | |
1295 | if (!u) | |
1296 | { | |
1297 | return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); | |
1298 | } | |
1299 | else | |
1300 | { | |
1301 | return frame_base - (u->Total_frame_size << 3); | |
1302 | } | |
1303 | } | |
c5aa993b | 1304 | |
c906108c SS |
1305 | return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); |
1306 | } | |
1307 | } | |
1308 | else | |
1309 | { | |
1310 | struct frame_saved_regs saved_regs; | |
1311 | ||
1312 | /* Get the innermost frame. */ | |
1313 | tmp_frame = frame; | |
1314 | while (tmp_frame->next != NULL) | |
1315 | tmp_frame = tmp_frame->next; | |
1316 | ||
1317 | get_frame_saved_regs (tmp_frame, &saved_regs); | |
1318 | /* Abominable hack. See above. */ | |
1319 | if (current_target.to_has_execution == 0 | |
1320 | && ((saved_regs.regs[FLAGS_REGNUM] | |
1321 | && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4) | |
1322 | & 0x2)) | |
1323 | || (saved_regs.regs[FLAGS_REGNUM] == 0 | |
c5aa993b | 1324 | && read_register (FLAGS_REGNUM) & 0x2))) |
c906108c SS |
1325 | { |
1326 | u = find_unwind_entry (FRAME_SAVED_PC (frame)); | |
1327 | if (!u) | |
1328 | { | |
1329 | return read_memory_integer (saved_regs.regs[FP_REGNUM], 4); | |
1330 | } | |
c5aa993b JM |
1331 | else |
1332 | { | |
1333 | return frame_base - (u->Total_frame_size << 3); | |
1334 | } | |
c906108c | 1335 | } |
c5aa993b | 1336 | |
c906108c | 1337 | /* The value in %r3 was never saved into the stack (thus %r3 still |
c5aa993b | 1338 | holds the value of the previous frame pointer). */ |
c906108c SS |
1339 | return TARGET_READ_FP (); |
1340 | } | |
1341 | } | |
c906108c | 1342 | \f |
c5aa993b | 1343 | |
c906108c SS |
1344 | /* To see if a frame chain is valid, see if the caller looks like it |
1345 | was compiled with gcc. */ | |
1346 | ||
1347 | int | |
1348 | hppa_frame_chain_valid (chain, thisframe) | |
1349 | CORE_ADDR chain; | |
1350 | struct frame_info *thisframe; | |
1351 | { | |
1352 | struct minimal_symbol *msym_us; | |
1353 | struct minimal_symbol *msym_start; | |
1354 | struct unwind_table_entry *u, *next_u = NULL; | |
1355 | struct frame_info *next; | |
1356 | ||
1357 | if (!chain) | |
1358 | return 0; | |
1359 | ||
1360 | u = find_unwind_entry (thisframe->pc); | |
1361 | ||
1362 | if (u == NULL) | |
1363 | return 1; | |
1364 | ||
1365 | /* We can't just check that the same of msym_us is "_start", because | |
1366 | someone idiotically decided that they were going to make a Ltext_end | |
1367 | symbol with the same address. This Ltext_end symbol is totally | |
1368 | indistinguishable (as nearly as I can tell) from the symbol for a function | |
1369 | which is (legitimately, since it is in the user's namespace) | |
1370 | named Ltext_end, so we can't just ignore it. */ | |
1371 | msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); | |
1372 | msym_start = lookup_minimal_symbol ("_start", NULL, NULL); | |
1373 | if (msym_us | |
1374 | && msym_start | |
1375 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) | |
1376 | return 0; | |
1377 | ||
1378 | /* Grrrr. Some new idiot decided that they don't want _start for the | |
1379 | PRO configurations; $START$ calls main directly.... Deal with it. */ | |
1380 | msym_start = lookup_minimal_symbol ("$START$", NULL, NULL); | |
1381 | if (msym_us | |
1382 | && msym_start | |
1383 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) | |
1384 | return 0; | |
1385 | ||
1386 | next = get_next_frame (thisframe); | |
1387 | if (next) | |
1388 | next_u = find_unwind_entry (next->pc); | |
1389 | ||
1390 | /* If this frame does not save SP, has no stack, isn't a stub, | |
1391 | and doesn't "call" an interrupt routine or signal handler caller, | |
1392 | then its not valid. */ | |
1393 | if (u->Save_SP || u->Total_frame_size || u->stub_unwind.stub_type != 0 | |
1394 | || (thisframe->next && thisframe->next->signal_handler_caller) | |
1395 | || (next_u && next_u->HP_UX_interrupt_marker)) | |
1396 | return 1; | |
1397 | ||
1398 | if (pc_in_linker_stub (thisframe->pc)) | |
1399 | return 1; | |
1400 | ||
1401 | return 0; | |
1402 | } | |
1403 | ||
1404 | /* | |
1405 | These functions deal with saving and restoring register state | |
1406 | around a function call in the inferior. They keep the stack | |
1407 | double-word aligned; eventually, on an hp700, the stack will have | |
1408 | to be aligned to a 64-byte boundary. */ | |
1409 | ||
1410 | void | |
1411 | push_dummy_frame (inf_status) | |
1412 | struct inferior_status *inf_status; | |
1413 | { | |
1414 | CORE_ADDR sp, pc, pcspace; | |
1415 | register int regnum; | |
1416 | int int_buffer; | |
1417 | double freg_buffer; | |
1418 | ||
1419 | /* Oh, what a hack. If we're trying to perform an inferior call | |
1420 | while the inferior is asleep, we have to make sure to clear | |
1421 | the "in system call" bit in the flag register (the call will | |
1422 | start after the syscall returns, so we're no longer in the system | |
1423 | call!) This state is kept in "inf_status", change it there. | |
1424 | ||
1425 | We also need a number of horrid hacks to deal with lossage in the | |
1426 | PC queue registers (apparently they're not valid when the in syscall | |
1427 | bit is set). */ | |
1428 | pc = target_read_pc (inferior_pid); | |
1429 | int_buffer = read_register (FLAGS_REGNUM); | |
1430 | if (int_buffer & 0x2) | |
1431 | { | |
1432 | unsigned int sid; | |
1433 | int_buffer &= ~0x2; | |
7a292a7a SS |
1434 | write_inferior_status_register (inf_status, 0, int_buffer); |
1435 | write_inferior_status_register (inf_status, PCOQ_HEAD_REGNUM, pc + 0); | |
1436 | write_inferior_status_register (inf_status, PCOQ_TAIL_REGNUM, pc + 4); | |
c906108c SS |
1437 | sid = (pc >> 30) & 0x3; |
1438 | if (sid == 0) | |
1439 | pcspace = read_register (SR4_REGNUM); | |
1440 | else | |
1441 | pcspace = read_register (SR4_REGNUM + 4 + sid); | |
7a292a7a SS |
1442 | write_inferior_status_register (inf_status, PCSQ_HEAD_REGNUM, pcspace); |
1443 | write_inferior_status_register (inf_status, PCSQ_TAIL_REGNUM, pcspace); | |
c906108c SS |
1444 | } |
1445 | else | |
1446 | pcspace = read_register (PCSQ_HEAD_REGNUM); | |
1447 | ||
1448 | /* Space for "arguments"; the RP goes in here. */ | |
1449 | sp = read_register (SP_REGNUM) + 48; | |
1450 | int_buffer = read_register (RP_REGNUM) | 0x3; | |
c5aa993b | 1451 | write_memory (sp - 20, (char *) &int_buffer, 4); |
c906108c SS |
1452 | |
1453 | int_buffer = TARGET_READ_FP (); | |
c5aa993b | 1454 | write_memory (sp, (char *) &int_buffer, 4); |
c906108c SS |
1455 | |
1456 | write_register (FP_REGNUM, sp); | |
1457 | ||
1458 | sp += 8; | |
1459 | ||
1460 | for (regnum = 1; regnum < 32; regnum++) | |
1461 | if (regnum != RP_REGNUM && regnum != FP_REGNUM) | |
1462 | sp = push_word (sp, read_register (regnum)); | |
1463 | ||
1464 | sp += 4; | |
1465 | ||
1466 | for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) | |
1467 | { | |
c5aa993b JM |
1468 | read_register_bytes (REGISTER_BYTE (regnum), (char *) &freg_buffer, 8); |
1469 | sp = push_bytes (sp, (char *) &freg_buffer, 8); | |
c906108c SS |
1470 | } |
1471 | sp = push_word (sp, read_register (IPSW_REGNUM)); | |
1472 | sp = push_word (sp, read_register (SAR_REGNUM)); | |
1473 | sp = push_word (sp, pc); | |
1474 | sp = push_word (sp, pcspace); | |
1475 | sp = push_word (sp, pc + 4); | |
1476 | sp = push_word (sp, pcspace); | |
1477 | write_register (SP_REGNUM, sp); | |
1478 | } | |
1479 | ||
1480 | static void | |
1481 | find_dummy_frame_regs (frame, frame_saved_regs) | |
1482 | struct frame_info *frame; | |
1483 | struct frame_saved_regs *frame_saved_regs; | |
1484 | { | |
1485 | CORE_ADDR fp = frame->frame; | |
1486 | int i; | |
1487 | ||
1488 | frame_saved_regs->regs[RP_REGNUM] = (fp - 20) & ~0x3; | |
1489 | frame_saved_regs->regs[FP_REGNUM] = fp; | |
1490 | frame_saved_regs->regs[1] = fp + 8; | |
1491 | ||
1492 | for (fp += 12, i = 3; i < 32; i++) | |
1493 | { | |
1494 | if (i != FP_REGNUM) | |
1495 | { | |
1496 | frame_saved_regs->regs[i] = fp; | |
1497 | fp += 4; | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | fp += 4; | |
1502 | for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8) | |
1503 | frame_saved_regs->regs[i] = fp; | |
1504 | ||
1505 | frame_saved_regs->regs[IPSW_REGNUM] = fp; | |
1506 | frame_saved_regs->regs[SAR_REGNUM] = fp + 4; | |
1507 | frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 8; | |
1508 | frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 12; | |
1509 | frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 16; | |
1510 | frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 20; | |
1511 | } | |
1512 | ||
1513 | void | |
1514 | hppa_pop_frame () | |
1515 | { | |
1516 | register struct frame_info *frame = get_current_frame (); | |
1517 | register CORE_ADDR fp, npc, target_pc; | |
1518 | register int regnum; | |
1519 | struct frame_saved_regs fsr; | |
1520 | double freg_buffer; | |
1521 | ||
1522 | fp = FRAME_FP (frame); | |
1523 | get_frame_saved_regs (frame, &fsr); | |
1524 | ||
1525 | #ifndef NO_PC_SPACE_QUEUE_RESTORE | |
c5aa993b | 1526 | if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */ |
c906108c SS |
1527 | restore_pc_queue (&fsr); |
1528 | #endif | |
1529 | ||
1530 | for (regnum = 31; regnum > 0; regnum--) | |
1531 | if (fsr.regs[regnum]) | |
1532 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); | |
1533 | ||
c5aa993b | 1534 | for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM; regnum--) |
c906108c SS |
1535 | if (fsr.regs[regnum]) |
1536 | { | |
c5aa993b JM |
1537 | read_memory (fsr.regs[regnum], (char *) &freg_buffer, 8); |
1538 | write_register_bytes (REGISTER_BYTE (regnum), (char *) &freg_buffer, 8); | |
c906108c SS |
1539 | } |
1540 | ||
1541 | if (fsr.regs[IPSW_REGNUM]) | |
1542 | write_register (IPSW_REGNUM, | |
c5aa993b | 1543 | read_memory_integer (fsr.regs[IPSW_REGNUM], 4)); |
c906108c SS |
1544 | |
1545 | if (fsr.regs[SAR_REGNUM]) | |
1546 | write_register (SAR_REGNUM, | |
c5aa993b | 1547 | read_memory_integer (fsr.regs[SAR_REGNUM], 4)); |
c906108c SS |
1548 | |
1549 | /* If the PC was explicitly saved, then just restore it. */ | |
1550 | if (fsr.regs[PCOQ_TAIL_REGNUM]) | |
1551 | { | |
1552 | npc = read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4); | |
1553 | write_register (PCOQ_TAIL_REGNUM, npc); | |
1554 | } | |
1555 | /* Else use the value in %rp to set the new PC. */ | |
c5aa993b | 1556 | else |
c906108c SS |
1557 | { |
1558 | npc = read_register (RP_REGNUM); | |
1559 | write_pc (npc); | |
1560 | } | |
1561 | ||
1562 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
1563 | ||
c5aa993b | 1564 | if (fsr.regs[IPSW_REGNUM]) /* call dummy */ |
c906108c SS |
1565 | write_register (SP_REGNUM, fp - 48); |
1566 | else | |
1567 | write_register (SP_REGNUM, fp); | |
1568 | ||
1569 | /* The PC we just restored may be inside a return trampoline. If so | |
1570 | we want to restart the inferior and run it through the trampoline. | |
1571 | ||
1572 | Do this by setting a momentary breakpoint at the location the | |
1573 | trampoline returns to. | |
1574 | ||
1575 | Don't skip through the trampoline if we're popping a dummy frame. */ | |
1576 | target_pc = SKIP_TRAMPOLINE_CODE (npc & ~0x3) & ~0x3; | |
1577 | if (target_pc && !fsr.regs[IPSW_REGNUM]) | |
1578 | { | |
1579 | struct symtab_and_line sal; | |
1580 | struct breakpoint *breakpoint; | |
1581 | struct cleanup *old_chain; | |
1582 | ||
1583 | /* Set up our breakpoint. Set it to be silent as the MI code | |
c5aa993b | 1584 | for "return_command" will print the frame we returned to. */ |
c906108c SS |
1585 | sal = find_pc_line (target_pc, 0); |
1586 | sal.pc = target_pc; | |
1587 | breakpoint = set_momentary_breakpoint (sal, NULL, bp_finish); | |
1588 | breakpoint->silent = 1; | |
1589 | ||
1590 | /* So we can clean things up. */ | |
1591 | old_chain = make_cleanup ((make_cleanup_func) delete_breakpoint, breakpoint); | |
1592 | ||
1593 | /* Start up the inferior. */ | |
1594 | clear_proceed_status (); | |
1595 | proceed_to_finish = 1; | |
c5aa993b | 1596 | proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_DEFAULT, 0); |
c906108c SS |
1597 | |
1598 | /* Perform our cleanups. */ | |
1599 | do_cleanups (old_chain); | |
1600 | } | |
1601 | flush_cached_frames (); | |
1602 | } | |
1603 | ||
1604 | /* After returning to a dummy on the stack, restore the instruction | |
1605 | queue space registers. */ | |
1606 | ||
1607 | static int | |
1608 | restore_pc_queue (fsr) | |
1609 | struct frame_saved_regs *fsr; | |
1610 | { | |
1611 | CORE_ADDR pc = read_pc (); | |
1612 | CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4); | |
1613 | struct target_waitstatus w; | |
1614 | int insn_count; | |
1615 | ||
1616 | /* Advance past break instruction in the call dummy. */ | |
1617 | write_register (PCOQ_HEAD_REGNUM, pc + 4); | |
1618 | write_register (PCOQ_TAIL_REGNUM, pc + 8); | |
1619 | ||
1620 | /* HPUX doesn't let us set the space registers or the space | |
1621 | registers of the PC queue through ptrace. Boo, hiss. | |
1622 | Conveniently, the call dummy has this sequence of instructions | |
1623 | after the break: | |
c5aa993b JM |
1624 | mtsp r21, sr0 |
1625 | ble,n 0(sr0, r22) | |
1626 | ||
c906108c SS |
1627 | So, load up the registers and single step until we are in the |
1628 | right place. */ | |
1629 | ||
1630 | write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4)); | |
1631 | write_register (22, new_pc); | |
1632 | ||
1633 | for (insn_count = 0; insn_count < 3; insn_count++) | |
1634 | { | |
1635 | /* FIXME: What if the inferior gets a signal right now? Want to | |
c5aa993b JM |
1636 | merge this into wait_for_inferior (as a special kind of |
1637 | watchpoint? By setting a breakpoint at the end? Is there | |
1638 | any other choice? Is there *any* way to do this stuff with | |
1639 | ptrace() or some equivalent?). */ | |
c906108c SS |
1640 | resume (1, 0); |
1641 | target_wait (inferior_pid, &w); | |
1642 | ||
1643 | if (w.kind == TARGET_WAITKIND_SIGNALLED) | |
c5aa993b JM |
1644 | { |
1645 | stop_signal = w.value.sig; | |
1646 | terminal_ours_for_output (); | |
1647 | printf_unfiltered ("\nProgram terminated with signal %s, %s.\n", | |
c906108c SS |
1648 | target_signal_to_name (stop_signal), |
1649 | target_signal_to_string (stop_signal)); | |
c5aa993b JM |
1650 | gdb_flush (gdb_stdout); |
1651 | return 0; | |
1652 | } | |
c906108c SS |
1653 | } |
1654 | target_terminal_ours (); | |
1655 | target_fetch_registers (-1); | |
1656 | return 1; | |
1657 | } | |
1658 | ||
1659 | #if 0 | |
1660 | CORE_ADDR | |
1661 | hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
1662 | int nargs; | |
1663 | value_ptr *args; | |
1664 | CORE_ADDR sp; | |
1665 | int struct_return; | |
1666 | CORE_ADDR struct_addr; | |
1667 | { | |
1668 | /* array of arguments' offsets */ | |
c5aa993b | 1669 | int *offset = (int *) alloca (nargs * sizeof (int)); |
c906108c SS |
1670 | int cum = 0; |
1671 | int i, alignment; | |
c5aa993b | 1672 | |
c906108c SS |
1673 | for (i = 0; i < nargs; i++) |
1674 | { | |
1675 | int x = 0; | |
1676 | /* cum is the sum of the lengths in bytes of | |
c5aa993b | 1677 | the arguments seen so far */ |
c906108c SS |
1678 | cum += TYPE_LENGTH (VALUE_TYPE (args[i])); |
1679 | ||
c5aa993b JM |
1680 | /* value must go at proper alignment. Assume alignment is a |
1681 | power of two. */ | |
c906108c SS |
1682 | alignment = hppa_alignof (VALUE_TYPE (args[i])); |
1683 | ||
1684 | if (cum % alignment) | |
1685 | cum = (cum + alignment) & -alignment; | |
1686 | offset[i] = -cum; | |
1687 | ||
1688 | } | |
1689 | sp += max ((cum + 7) & -8, 16); | |
1690 | ||
1691 | for (i = 0; i < nargs; i++) | |
1692 | write_memory (sp + offset[i], VALUE_CONTENTS (args[i]), | |
1693 | TYPE_LENGTH (VALUE_TYPE (args[i]))); | |
1694 | ||
1695 | if (struct_return) | |
1696 | write_register (28, struct_addr); | |
1697 | return sp + 32; | |
1698 | } | |
1699 | #endif | |
1700 | ||
1701 | /* elz: I am rewriting this function, because the one above is a very | |
1702 | obscure piece of code. | |
1703 | This function pushes the arguments on the stack. The stack grows up | |
1704 | on the PA. | |
1705 | Each argument goes in one (or more) word (4 bytes) on the stack. | |
1706 | The first four words for the args must be allocated, even if they | |
1707 | are not used. | |
1708 | The 'topmost' arg is arg0, the 'bottom-most' is arg3. (if you think of | |
1709 | them as 1 word long). | |
1710 | Below these there can be any number of arguments, as needed by the function. | |
1711 | If an arg is bigger than one word, it will be written on the stack | |
1712 | occupying as many words as needed. Args that are bigger than 64bits | |
1713 | are not copied on the stack, a pointer is passed instead. | |
1714 | ||
1715 | On top of the arg0 word there are other 8 words (32bytes) which are used | |
1716 | for other purposes */ | |
1717 | ||
1718 | CORE_ADDR | |
1719 | hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
1720 | int nargs; | |
1721 | value_ptr *args; | |
1722 | CORE_ADDR sp; | |
1723 | int struct_return; | |
1724 | CORE_ADDR struct_addr; | |
1725 | { | |
1726 | /* array of arguments' offsets */ | |
c5aa993b | 1727 | int *offset = (int *) alloca (nargs * sizeof (int)); |
c906108c | 1728 | /* array of arguments' lengths: real lengths in bytes, not aligned to word size */ |
c5aa993b | 1729 | int *lengths = (int *) alloca (nargs * sizeof (int)); |
c906108c | 1730 | |
c5aa993b JM |
1731 | int bytes_reserved; /* this is the number of bytes on the stack occupied by an |
1732 | argument. This will be always a multiple of 4 */ | |
c906108c | 1733 | |
c5aa993b JM |
1734 | int cum_bytes_reserved = 0; /* this is the total number of bytes reserved by the args |
1735 | seen so far. It is a multiple of 4 always */ | |
1736 | int cum_bytes_aligned = 0; /* same as above, but aligned on 8 bytes */ | |
1737 | int i; | |
c906108c SS |
1738 | |
1739 | /* When an arg does not occupy a whole word, for instance in bitfields: | |
1740 | if the arg is x bits (0<x<32), it must be written | |
1741 | starting from the (x-1)-th position down until the 0-th position. | |
c5aa993b | 1742 | It is enough to align it to the word. */ |
c906108c SS |
1743 | /* if an arg occupies 8 bytes, it must be aligned on the 64-bits |
1744 | high order word in odd arg word. */ | |
1745 | /* if an arg is larger than 64 bits, we need to pass a pointer to it, and | |
1746 | copy the actual value on the stack, so that the callee can play with it. | |
1747 | This is taken care of in valops.c in the call_function_by_hand function. | |
1748 | The argument that is received in this function here has already be converted | |
1749 | to a pointer to whatever is needed, so that it just can be pushed | |
1750 | as a word argument */ | |
c5aa993b | 1751 | |
c906108c SS |
1752 | for (i = 0; i < nargs; i++) |
1753 | { | |
1754 | ||
1755 | lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i])); | |
1756 | ||
1757 | if (lengths[i] % 4) | |
c5aa993b JM |
1758 | bytes_reserved = (lengths[i] / 4) * 4 + 4; |
1759 | else | |
1760 | bytes_reserved = lengths[i]; | |
c906108c SS |
1761 | |
1762 | offset[i] = cum_bytes_reserved + lengths[i]; | |
1763 | ||
c5aa993b JM |
1764 | if ((bytes_reserved == 8) && (offset[i] % 8)) /* if 64-bit arg is not 64 bit aligned */ |
1765 | { | |
1766 | int new_offset = 0; | |
1767 | /* bytes_reserved is already aligned to the word, so we put it at one word | |
1768 | more down the stack. This will leave one empty word on the | |
1769 | stack, and one unused register. This is OK, see the calling | |
1770 | convention doc */ | |
1771 | /* the offset may have to be moved to the corresponding position | |
1772 | one word down the stack, to maintain | |
1773 | alignment. */ | |
1774 | new_offset = (offset[i] / 8) * 8 + 8; | |
1775 | if ((new_offset - offset[i]) >= 4) | |
1776 | { | |
1777 | bytes_reserved += 4; | |
1778 | offset[i] += 4; | |
1779 | } | |
1780 | } | |
c906108c SS |
1781 | |
1782 | cum_bytes_reserved += bytes_reserved; | |
1783 | ||
1784 | } | |
1785 | ||
1786 | /* now move up the sp to reserve at least 4 words required for the args, | |
1787 | or more than this if needed */ | |
1788 | /* wee also need to keep the sp aligned to 8 bytes */ | |
1789 | cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved); | |
1790 | sp += max (cum_bytes_aligned, 16); | |
1791 | ||
1792 | /* now write each of the args at the proper offset down the stack */ | |
1793 | for (i = 0; i < nargs; i++) | |
1794 | write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]); | |
c906108c | 1795 | |
c5aa993b JM |
1796 | |
1797 | /* if a structure has to be returned, set up register 28 to hold its address */ | |
c906108c SS |
1798 | if (struct_return) |
1799 | write_register (28, struct_addr); | |
1800 | ||
c5aa993b | 1801 | /* the stack will have other 8 words on top of the args */ |
c906108c SS |
1802 | return sp + 32; |
1803 | } | |
1804 | ||
1805 | ||
1806 | /* elz: this function returns a value which is built looking at the given address. | |
1807 | It is called from call_function_by_hand, in case we need to return a | |
1808 | value which is larger than 64 bits, and it is stored in the stack rather than | |
1809 | in the registers r28 and r29 or fr4. | |
1810 | This function does the same stuff as value_being_returned in values.c, but | |
1811 | gets the value from the stack rather than from the buffer where all the | |
1812 | registers were saved when the function called completed. */ | |
1813 | value_ptr | |
c5aa993b | 1814 | hppa_value_returned_from_stack (valtype, addr) |
c906108c SS |
1815 | register struct type *valtype; |
1816 | CORE_ADDR addr; | |
1817 | { | |
1818 | register value_ptr val; | |
1819 | ||
1820 | val = allocate_value (valtype); | |
1821 | CHECK_TYPEDEF (valtype); | |
c5aa993b | 1822 | target_read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (valtype)); |
c906108c SS |
1823 | |
1824 | return val; | |
1825 | } | |
1826 | ||
1827 | ||
1828 | ||
1829 | /* elz: Used to lookup a symbol in the shared libraries. | |
c5aa993b JM |
1830 | This function calls shl_findsym, indirectly through a |
1831 | call to __d_shl_get. __d_shl_get is in end.c, which is always | |
1832 | linked in by the hp compilers/linkers. | |
1833 | The call to shl_findsym cannot be made directly because it needs | |
1834 | to be active in target address space. | |
1835 | inputs: - minimal symbol pointer for the function we want to look up | |
1836 | - address in target space of the descriptor for the library | |
1837 | where we want to look the symbol up. | |
1838 | This address is retrieved using the | |
1839 | som_solib_get_solib_by_pc function (somsolib.c). | |
1840 | output: - real address in the library of the function. | |
1841 | note: the handle can be null, in which case shl_findsym will look for | |
1842 | the symbol in all the loaded shared libraries. | |
1843 | files to look at if you need reference on this stuff: | |
1844 | dld.c, dld_shl_findsym.c | |
1845 | end.c | |
1846 | man entry for shl_findsym */ | |
c906108c SS |
1847 | |
1848 | CORE_ADDR | |
c5aa993b JM |
1849 | find_stub_with_shl_get (function, handle) |
1850 | struct minimal_symbol *function; | |
1851 | CORE_ADDR handle; | |
c906108c | 1852 | { |
c5aa993b JM |
1853 | struct symbol *get_sym, *symbol2; |
1854 | struct minimal_symbol *buff_minsym, *msymbol; | |
1855 | struct type *ftype; | |
1856 | value_ptr *args; | |
1857 | value_ptr funcval, val; | |
1858 | ||
1859 | int x, namelen, err_value, tmp = -1; | |
1860 | CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; | |
1861 | CORE_ADDR stub_addr; | |
1862 | ||
1863 | ||
1864 | args = (value_ptr *) alloca (sizeof (value_ptr) * 8); /* 6 for the arguments and one null one??? */ | |
1865 | funcval = find_function_in_inferior ("__d_shl_get"); | |
1866 | get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_NAMESPACE, NULL, NULL); | |
1867 | buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL); | |
1868 | msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); | |
1869 | symbol2 = lookup_symbol ("__shldp", NULL, VAR_NAMESPACE, NULL, NULL); | |
1870 | endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); | |
1871 | namelen = strlen (SYMBOL_NAME (function)); | |
1872 | value_return_addr = endo_buff_addr + namelen; | |
1873 | ftype = check_typedef (SYMBOL_TYPE (get_sym)); | |
1874 | ||
1875 | /* do alignment */ | |
1876 | if ((x = value_return_addr % 64) != 0) | |
1877 | value_return_addr = value_return_addr + 64 - x; | |
1878 | ||
1879 | errno_return_addr = value_return_addr + 64; | |
1880 | ||
1881 | ||
1882 | /* set up stuff needed by __d_shl_get in buffer in end.o */ | |
1883 | ||
1884 | target_write_memory (endo_buff_addr, SYMBOL_NAME (function), namelen); | |
1885 | ||
1886 | target_write_memory (value_return_addr, (char *) &tmp, 4); | |
1887 | ||
1888 | target_write_memory (errno_return_addr, (char *) &tmp, 4); | |
1889 | ||
1890 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
1891 | (char *) &handle, 4); | |
1892 | ||
1893 | /* now prepare the arguments for the call */ | |
1894 | ||
1895 | args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12); | |
1896 | args[1] = value_from_longest (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol)); | |
1897 | args[2] = value_from_longest (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr); | |
1898 | args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE); | |
1899 | args[4] = value_from_longest (TYPE_FIELD_TYPE (ftype, 4), value_return_addr); | |
1900 | args[5] = value_from_longest (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr); | |
1901 | ||
1902 | /* now call the function */ | |
1903 | ||
1904 | val = call_function_by_hand (funcval, 6, args); | |
1905 | ||
1906 | /* now get the results */ | |
1907 | ||
1908 | target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value)); | |
1909 | ||
1910 | target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr)); | |
1911 | if (stub_addr <= 0) | |
1912 | error ("call to __d_shl_get failed, error code is %d", err_value); /* purecov: deadcode */ | |
1913 | ||
1914 | return (stub_addr); | |
c906108c SS |
1915 | } |
1916 | ||
c5aa993b | 1917 | /* Cover routine for find_stub_with_shl_get to pass to catch_errors */ |
a0b3c4fd JM |
1918 | static int |
1919 | cover_find_stub_with_shl_get (PTR args_untyped) | |
c906108c | 1920 | { |
a0b3c4fd JM |
1921 | args_for_find_stub *args = args_untyped; |
1922 | args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle); | |
1923 | return 0; | |
c906108c SS |
1924 | } |
1925 | ||
c906108c SS |
1926 | /* Insert the specified number of args and function address |
1927 | into a call sequence of the above form stored at DUMMYNAME. | |
1928 | ||
1929 | On the hppa we need to call the stack dummy through $$dyncall. | |
1930 | Therefore our version of FIX_CALL_DUMMY takes an extra argument, | |
1931 | real_pc, which is the location where gdb should start up the | |
cce74817 JM |
1932 | inferior to do the function call. |
1933 | ||
1934 | This has to work across several versions of hpux, bsd, osf1. It has to | |
1935 | work regardless of what compiler was used to build the inferior program. | |
1936 | It should work regardless of whether or not end.o is available. It has | |
1937 | to work even if gdb can not call into the dynamic loader in the inferior | |
1938 | to query it for symbol names and addresses. | |
1939 | ||
1940 | Yes, all those cases should work. Luckily code exists to handle most | |
1941 | of them. The complexity is in selecting exactly what scheme should | |
1942 | be used to perform the inferior call. | |
1943 | ||
1944 | At the current time this routine is known not to handle cases where | |
1945 | the program was linked with HP's compiler without including end.o. | |
1946 | ||
1947 | Please contact Jeff Law (law@cygnus.com) before changing this code. */ | |
c906108c SS |
1948 | |
1949 | CORE_ADDR | |
1950 | hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) | |
1951 | char *dummy; | |
1952 | CORE_ADDR pc; | |
1953 | CORE_ADDR fun; | |
1954 | int nargs; | |
1955 | value_ptr *args; | |
1956 | struct type *type; | |
1957 | int gcc_p; | |
1958 | { | |
1959 | CORE_ADDR dyncall_addr; | |
1960 | struct minimal_symbol *msymbol; | |
1961 | struct minimal_symbol *trampoline; | |
1962 | int flags = read_register (FLAGS_REGNUM); | |
cce74817 JM |
1963 | struct unwind_table_entry *u = NULL; |
1964 | CORE_ADDR new_stub = 0; | |
1965 | CORE_ADDR solib_handle = 0; | |
1966 | ||
1967 | /* Nonzero if we will use GCC's PLT call routine. This routine must be | |
c5aa993b | 1968 | passed an import stub, not a PLABEL. It is also necessary to set %r19 |
cce74817 | 1969 | (the PIC register) before performing the call. |
c906108c | 1970 | |
cce74817 JM |
1971 | If zero, then we are using __d_plt_call (HP's PLT call routine) or we |
1972 | are calling the target directly. When using __d_plt_call we want to | |
1973 | use a PLABEL instead of an import stub. */ | |
1974 | int using_gcc_plt_call = 1; | |
1975 | ||
1976 | /* Prefer __gcc_plt_call over the HP supplied routine because | |
c5aa993b | 1977 | __gcc_plt_call works for any number of arguments. */ |
c906108c | 1978 | trampoline = NULL; |
cce74817 JM |
1979 | if (lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL) == NULL) |
1980 | using_gcc_plt_call = 0; | |
1981 | ||
c906108c SS |
1982 | msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL); |
1983 | if (msymbol == NULL) | |
cce74817 | 1984 | error ("Can't find an address for $$dyncall trampoline"); |
c906108c SS |
1985 | |
1986 | dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
1987 | ||
1988 | /* FUN could be a procedure label, in which case we have to get | |
cce74817 JM |
1989 | its real address and the value of its GOT/DP if we plan to |
1990 | call the routine via gcc_plt_call. */ | |
1991 | if ((fun & 0x2) && using_gcc_plt_call) | |
c906108c SS |
1992 | { |
1993 | /* Get the GOT/DP value for the target function. It's | |
c5aa993b JM |
1994 | at *(fun+4). Note the call dummy is *NOT* allowed to |
1995 | trash %r19 before calling the target function. */ | |
c906108c SS |
1996 | write_register (19, read_memory_integer ((fun & ~0x3) + 4, 4)); |
1997 | ||
1998 | /* Now get the real address for the function we are calling, it's | |
c5aa993b | 1999 | at *fun. */ |
c906108c SS |
2000 | fun = (CORE_ADDR) read_memory_integer (fun & ~0x3, 4); |
2001 | } | |
2002 | else | |
2003 | { | |
2004 | ||
2005 | #ifndef GDB_TARGET_IS_PA_ELF | |
cce74817 | 2006 | /* FUN could be an export stub, the real address of a function, or |
c5aa993b JM |
2007 | a PLABEL. When using gcc's PLT call routine we must call an import |
2008 | stub rather than the export stub or real function for lazy binding | |
2009 | to work correctly | |
cce74817 | 2010 | |
c5aa993b JM |
2011 | /* If we are using the gcc PLT call routine, then we need to |
2012 | get the import stub for the target function. */ | |
cce74817 | 2013 | if (using_gcc_plt_call && som_solib_get_got_by_pc (fun)) |
c906108c SS |
2014 | { |
2015 | struct objfile *objfile; | |
2016 | struct minimal_symbol *funsymbol, *stub_symbol; | |
2017 | CORE_ADDR newfun = 0; | |
2018 | ||
2019 | funsymbol = lookup_minimal_symbol_by_pc (fun); | |
2020 | if (!funsymbol) | |
2021 | error ("Unable to find minimal symbol for target fucntion.\n"); | |
2022 | ||
2023 | /* Search all the object files for an import symbol with the | |
2024 | right name. */ | |
2025 | ALL_OBJFILES (objfile) | |
c5aa993b JM |
2026 | { |
2027 | stub_symbol | |
2028 | = lookup_minimal_symbol_solib_trampoline | |
2029 | (SYMBOL_NAME (funsymbol), NULL, objfile); | |
2030 | ||
2031 | if (!stub_symbol) | |
2032 | stub_symbol = lookup_minimal_symbol (SYMBOL_NAME (funsymbol), | |
2033 | NULL, objfile); | |
2034 | ||
2035 | /* Found a symbol with the right name. */ | |
2036 | if (stub_symbol) | |
2037 | { | |
2038 | struct unwind_table_entry *u; | |
2039 | /* It must be a shared library trampoline. */ | |
2040 | if (MSYMBOL_TYPE (stub_symbol) != mst_solib_trampoline) | |
2041 | continue; | |
2042 | ||
2043 | /* It must also be an import stub. */ | |
2044 | u = find_unwind_entry (SYMBOL_VALUE (stub_symbol)); | |
2045 | if (!u | |
2046 | || (u->stub_unwind.stub_type != IMPORT) | |
2047 | && u->stub_unwind.stub_type != IMPORT_SHLIB) | |
2048 | continue; | |
2049 | ||
2050 | /* OK. Looks like the correct import stub. */ | |
2051 | newfun = SYMBOL_VALUE (stub_symbol); | |
2052 | fun = newfun; | |
2053 | } | |
2054 | } | |
cce74817 JM |
2055 | |
2056 | /* Ouch. We did not find an import stub. Make an attempt to | |
2057 | do the right thing instead of just croaking. Most of the | |
2058 | time this will actually work. */ | |
c906108c SS |
2059 | if (newfun == 0) |
2060 | write_register (19, som_solib_get_got_by_pc (fun)); | |
cce74817 JM |
2061 | |
2062 | u = find_unwind_entry (fun); | |
c5aa993b | 2063 | if (u |
cce74817 JM |
2064 | && (u->stub_unwind.stub_type == IMPORT |
2065 | || u->stub_unwind.stub_type == IMPORT_SHLIB)) | |
2066 | trampoline = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL); | |
2067 | ||
2068 | /* If we found the import stub in the shared library, then we have | |
2069 | to set %r19 before we call the stub. */ | |
2070 | if (u && u->stub_unwind.stub_type == IMPORT_SHLIB) | |
2071 | write_register (19, som_solib_get_got_by_pc (fun)); | |
c906108c | 2072 | } |
c906108c SS |
2073 | #endif |
2074 | } | |
2075 | ||
cce74817 JM |
2076 | /* If we are calling into another load module then have sr4export call the |
2077 | magic __d_plt_call routine which is linked in from end.o. | |
c906108c | 2078 | |
cce74817 JM |
2079 | You can't use _sr4export to make the call as the value in sp-24 will get |
2080 | fried and you end up returning to the wrong location. You can't call the | |
2081 | target as the code to bind the PLT entry to a function can't return to a | |
2082 | stack address. | |
2083 | ||
2084 | Also, query the dynamic linker in the inferior to provide a suitable | |
2085 | PLABEL for the target function. */ | |
c5aa993b | 2086 | if (!using_gcc_plt_call) |
c906108c SS |
2087 | { |
2088 | CORE_ADDR new_fun; | |
2089 | ||
cce74817 | 2090 | /* Get a handle for the shared library containing FUN. Given the |
c5aa993b | 2091 | handle we can query the shared library for a PLABEL. */ |
cce74817 | 2092 | solib_handle = som_solib_get_solib_by_pc (fun); |
c906108c | 2093 | |
cce74817 | 2094 | if (solib_handle) |
c906108c | 2095 | { |
cce74817 | 2096 | struct minimal_symbol *fmsymbol = lookup_minimal_symbol_by_pc (fun); |
c906108c | 2097 | |
cce74817 JM |
2098 | trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL); |
2099 | ||
2100 | if (trampoline == NULL) | |
2101 | { | |
2102 | error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc."); | |
2103 | } | |
2104 | ||
2105 | /* This is where sr4export will jump to. */ | |
2106 | new_fun = SYMBOL_VALUE_ADDRESS (trampoline); | |
2107 | ||
2108 | /* If the function is in a shared library, then call __d_shl_get to | |
2109 | get a PLABEL for the target function. */ | |
2110 | new_stub = find_stub_with_shl_get (fmsymbol, solib_handle); | |
2111 | ||
c5aa993b | 2112 | if (new_stub == 0) |
cce74817 | 2113 | error ("Can't find an import stub for %s", SYMBOL_NAME (fmsymbol)); |
c906108c SS |
2114 | |
2115 | /* We have to store the address of the stub in __shlib_funcptr. */ | |
cce74817 | 2116 | msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL, |
c5aa993b | 2117 | (struct objfile *) NULL); |
c906108c | 2118 | |
cce74817 JM |
2119 | if (msymbol == NULL) |
2120 | error ("Can't find an address for __shlib_funcptr"); | |
2121 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
c5aa993b | 2122 | (char *) &new_stub, 4); |
c906108c SS |
2123 | |
2124 | /* We want sr4export to call __d_plt_call, so we claim it is | |
2125 | the final target. Clear trampoline. */ | |
cce74817 JM |
2126 | fun = new_fun; |
2127 | trampoline = NULL; | |
c906108c SS |
2128 | } |
2129 | } | |
2130 | ||
adf40b2e | 2131 | #ifndef GDB_TARGET_IS_HPPA_20W |
c906108c SS |
2132 | /* Store upper 21 bits of function address into ldil. fun will either be |
2133 | the final target (most cases) or __d_plt_call when calling into a shared | |
2134 | library and __gcc_plt_call is not available. */ | |
2135 | store_unsigned_integer | |
2136 | (&dummy[FUNC_LDIL_OFFSET], | |
2137 | INSTRUCTION_SIZE, | |
2138 | deposit_21 (fun >> 11, | |
2139 | extract_unsigned_integer (&dummy[FUNC_LDIL_OFFSET], | |
2140 | INSTRUCTION_SIZE))); | |
2141 | ||
2142 | /* Store lower 11 bits of function address into ldo */ | |
2143 | store_unsigned_integer | |
2144 | (&dummy[FUNC_LDO_OFFSET], | |
2145 | INSTRUCTION_SIZE, | |
2146 | deposit_14 (fun & MASK_11, | |
2147 | extract_unsigned_integer (&dummy[FUNC_LDO_OFFSET], | |
2148 | INSTRUCTION_SIZE))); | |
adf40b2e | 2149 | #endif /* GDB_TARGET_IS_HPPA_20W */ |
c906108c SS |
2150 | #ifdef SR4EXPORT_LDIL_OFFSET |
2151 | ||
2152 | { | |
2153 | CORE_ADDR trampoline_addr; | |
2154 | ||
2155 | /* We may still need sr4export's address too. */ | |
2156 | ||
2157 | if (trampoline == NULL) | |
2158 | { | |
2159 | msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2160 | if (msymbol == NULL) | |
cce74817 | 2161 | error ("Can't find an address for _sr4export trampoline"); |
c906108c SS |
2162 | |
2163 | trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
2164 | } | |
2165 | else | |
2166 | trampoline_addr = SYMBOL_VALUE_ADDRESS (trampoline); | |
2167 | ||
2168 | ||
2169 | /* Store upper 21 bits of trampoline's address into ldil */ | |
2170 | store_unsigned_integer | |
2171 | (&dummy[SR4EXPORT_LDIL_OFFSET], | |
2172 | INSTRUCTION_SIZE, | |
2173 | deposit_21 (trampoline_addr >> 11, | |
2174 | extract_unsigned_integer (&dummy[SR4EXPORT_LDIL_OFFSET], | |
2175 | INSTRUCTION_SIZE))); | |
2176 | ||
2177 | /* Store lower 11 bits of trampoline's address into ldo */ | |
2178 | store_unsigned_integer | |
2179 | (&dummy[SR4EXPORT_LDO_OFFSET], | |
2180 | INSTRUCTION_SIZE, | |
2181 | deposit_14 (trampoline_addr & MASK_11, | |
2182 | extract_unsigned_integer (&dummy[SR4EXPORT_LDO_OFFSET], | |
2183 | INSTRUCTION_SIZE))); | |
2184 | } | |
2185 | #endif | |
2186 | ||
2187 | write_register (22, pc); | |
2188 | ||
2189 | /* If we are in a syscall, then we should call the stack dummy | |
2190 | directly. $$dyncall is not needed as the kernel sets up the | |
2191 | space id registers properly based on the value in %r31. In | |
2192 | fact calling $$dyncall will not work because the value in %r22 | |
2193 | will be clobbered on the syscall exit path. | |
2194 | ||
2195 | Similarly if the current PC is in a shared library. Note however, | |
2196 | this scheme won't work if the shared library isn't mapped into | |
2197 | the same space as the stack. */ | |
2198 | if (flags & 2) | |
2199 | return pc; | |
2200 | #ifndef GDB_TARGET_IS_PA_ELF | |
2201 | else if (som_solib_get_got_by_pc (target_read_pc (inferior_pid))) | |
2202 | return pc; | |
2203 | #endif | |
2204 | else | |
2205 | return dyncall_addr; | |
c906108c SS |
2206 | } |
2207 | ||
2208 | ||
2209 | ||
2210 | ||
2211 | /* If the pid is in a syscall, then the FP register is not readable. | |
2212 | We'll return zero in that case, rather than attempting to read it | |
2213 | and cause a warning. */ | |
2214 | CORE_ADDR | |
2215 | target_read_fp (pid) | |
c5aa993b | 2216 | int pid; |
c906108c SS |
2217 | { |
2218 | int flags = read_register (FLAGS_REGNUM); | |
2219 | ||
c5aa993b JM |
2220 | if (flags & 2) |
2221 | { | |
2222 | return (CORE_ADDR) 0; | |
2223 | } | |
c906108c SS |
2224 | |
2225 | /* This is the only site that may directly read_register () the FP | |
2226 | register. All others must use TARGET_READ_FP (). */ | |
2227 | return read_register (FP_REGNUM); | |
2228 | } | |
2229 | ||
2230 | ||
2231 | /* Get the PC from %r31 if currently in a syscall. Also mask out privilege | |
2232 | bits. */ | |
2233 | ||
2234 | CORE_ADDR | |
2235 | target_read_pc (pid) | |
2236 | int pid; | |
2237 | { | |
2238 | int flags = read_register_pid (FLAGS_REGNUM, pid); | |
2239 | ||
2240 | /* The following test does not belong here. It is OS-specific, and belongs | |
2241 | in native code. */ | |
2242 | /* Test SS_INSYSCALL */ | |
2243 | if (flags & 2) | |
2244 | return read_register_pid (31, pid) & ~0x3; | |
2245 | ||
2246 | return read_register_pid (PC_REGNUM, pid) & ~0x3; | |
2247 | } | |
2248 | ||
2249 | /* Write out the PC. If currently in a syscall, then also write the new | |
2250 | PC value into %r31. */ | |
2251 | ||
2252 | void | |
2253 | target_write_pc (v, pid) | |
2254 | CORE_ADDR v; | |
2255 | int pid; | |
2256 | { | |
2257 | int flags = read_register_pid (FLAGS_REGNUM, pid); | |
2258 | ||
2259 | /* The following test does not belong here. It is OS-specific, and belongs | |
2260 | in native code. */ | |
2261 | /* If in a syscall, then set %r31. Also make sure to get the | |
2262 | privilege bits set correctly. */ | |
2263 | /* Test SS_INSYSCALL */ | |
2264 | if (flags & 2) | |
2265 | write_register_pid (31, v | 0x3, pid); | |
2266 | ||
2267 | write_register_pid (PC_REGNUM, v, pid); | |
2268 | write_register_pid (NPC_REGNUM, v + 4, pid); | |
2269 | } | |
2270 | ||
2271 | /* return the alignment of a type in bytes. Structures have the maximum | |
2272 | alignment required by their fields. */ | |
2273 | ||
2274 | static int | |
2275 | hppa_alignof (type) | |
2276 | struct type *type; | |
2277 | { | |
2278 | int max_align, align, i; | |
2279 | CHECK_TYPEDEF (type); | |
2280 | switch (TYPE_CODE (type)) | |
2281 | { | |
2282 | case TYPE_CODE_PTR: | |
2283 | case TYPE_CODE_INT: | |
2284 | case TYPE_CODE_FLT: | |
2285 | return TYPE_LENGTH (type); | |
2286 | case TYPE_CODE_ARRAY: | |
2287 | return hppa_alignof (TYPE_FIELD_TYPE (type, 0)); | |
2288 | case TYPE_CODE_STRUCT: | |
2289 | case TYPE_CODE_UNION: | |
2290 | max_align = 1; | |
2291 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
2292 | { | |
2293 | /* Bit fields have no real alignment. */ | |
2294 | /* if (!TYPE_FIELD_BITPOS (type, i)) */ | |
c5aa993b | 2295 | if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */ |
c906108c SS |
2296 | { |
2297 | align = hppa_alignof (TYPE_FIELD_TYPE (type, i)); | |
2298 | max_align = max (max_align, align); | |
2299 | } | |
2300 | } | |
2301 | return max_align; | |
2302 | default: | |
2303 | return 4; | |
2304 | } | |
2305 | } | |
2306 | ||
2307 | /* Print the register regnum, or all registers if regnum is -1 */ | |
2308 | ||
2309 | void | |
2310 | pa_do_registers_info (regnum, fpregs) | |
2311 | int regnum; | |
2312 | int fpregs; | |
2313 | { | |
c5aa993b | 2314 | char raw_regs[REGISTER_BYTES]; |
c906108c SS |
2315 | int i; |
2316 | ||
2317 | /* Make a copy of gdb's save area (may cause actual | |
2318 | reads from the target). */ | |
2319 | for (i = 0; i < NUM_REGS; i++) | |
2320 | read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); | |
2321 | ||
2322 | if (regnum == -1) | |
2323 | pa_print_registers (raw_regs, regnum, fpregs); | |
c5aa993b JM |
2324 | else if (regnum < FP4_REGNUM) |
2325 | { | |
2326 | long reg_val[2]; | |
2327 | ||
2328 | /* Why is the value not passed through "extract_signed_integer" | |
2329 | as in "pa_print_registers" below? */ | |
2330 | pa_register_look_aside (raw_regs, regnum, ®_val[0]); | |
2331 | ||
2332 | if (!is_pa_2) | |
2333 | { | |
2334 | printf_unfiltered ("%s %x\n", REGISTER_NAME (regnum), reg_val[1]); | |
2335 | } | |
c906108c | 2336 | else |
c5aa993b JM |
2337 | { |
2338 | /* Fancy % formats to prevent leading zeros. */ | |
2339 | if (reg_val[0] == 0) | |
2340 | printf_unfiltered ("%s %x\n", REGISTER_NAME (regnum), reg_val[1]); | |
2341 | else | |
2342 | printf_unfiltered ("%s %x%8.8x\n", REGISTER_NAME (regnum), | |
2343 | reg_val[0], reg_val[1]); | |
2344 | } | |
c906108c | 2345 | } |
c906108c | 2346 | else |
c5aa993b JM |
2347 | /* Note that real floating point values only start at |
2348 | FP4_REGNUM. FP0 and up are just status and error | |
2349 | registers, which have integral (bit) values. */ | |
c906108c SS |
2350 | pa_print_fp_reg (regnum); |
2351 | } | |
2352 | ||
2353 | /********** new function ********************/ | |
2354 | void | |
2355 | pa_do_strcat_registers_info (regnum, fpregs, stream, precision) | |
2356 | int regnum; | |
2357 | int fpregs; | |
2358 | GDB_FILE *stream; | |
2359 | enum precision_type precision; | |
2360 | { | |
c5aa993b | 2361 | char raw_regs[REGISTER_BYTES]; |
c906108c SS |
2362 | int i; |
2363 | ||
2364 | /* Make a copy of gdb's save area (may cause actual | |
c5aa993b | 2365 | reads from the target). */ |
c906108c SS |
2366 | for (i = 0; i < NUM_REGS; i++) |
2367 | read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); | |
2368 | ||
2369 | if (regnum == -1) | |
2370 | pa_strcat_registers (raw_regs, regnum, fpregs, stream); | |
2371 | ||
c5aa993b JM |
2372 | else if (regnum < FP4_REGNUM) |
2373 | { | |
2374 | long reg_val[2]; | |
2375 | ||
2376 | /* Why is the value not passed through "extract_signed_integer" | |
2377 | as in "pa_print_registers" below? */ | |
2378 | pa_register_look_aside (raw_regs, regnum, ®_val[0]); | |
c906108c | 2379 | |
c5aa993b JM |
2380 | if (!is_pa_2) |
2381 | { | |
2382 | fprintf_unfiltered (stream, "%s %x", REGISTER_NAME (regnum), reg_val[1]); | |
2383 | } | |
c906108c | 2384 | else |
c5aa993b JM |
2385 | { |
2386 | /* Fancy % formats to prevent leading zeros. */ | |
2387 | if (reg_val[0] == 0) | |
2388 | fprintf_unfiltered (stream, "%s %x", REGISTER_NAME (regnum), | |
2389 | reg_val[1]); | |
2390 | else | |
2391 | fprintf_unfiltered (stream, "%s %x%8.8x", REGISTER_NAME (regnum), | |
2392 | reg_val[0], reg_val[1]); | |
2393 | } | |
c906108c | 2394 | } |
c906108c | 2395 | else |
c5aa993b JM |
2396 | /* Note that real floating point values only start at |
2397 | FP4_REGNUM. FP0 and up are just status and error | |
2398 | registers, which have integral (bit) values. */ | |
c906108c SS |
2399 | pa_strcat_fp_reg (regnum, stream, precision); |
2400 | } | |
2401 | ||
2402 | /* If this is a PA2.0 machine, fetch the real 64-bit register | |
2403 | value. Otherwise use the info from gdb's saved register area. | |
2404 | ||
2405 | Note that reg_val is really expected to be an array of longs, | |
2406 | with two elements. */ | |
2407 | static void | |
c5aa993b | 2408 | pa_register_look_aside (raw_regs, regnum, raw_val) |
c906108c | 2409 | char *raw_regs; |
c5aa993b | 2410 | int regnum; |
c906108c SS |
2411 | long *raw_val; |
2412 | { | |
c5aa993b | 2413 | static int know_which = 0; /* False */ |
c906108c | 2414 | |
c5aa993b | 2415 | int regaddr; |
c906108c SS |
2416 | unsigned int offset; |
2417 | register int i; | |
c5aa993b JM |
2418 | int start; |
2419 | ||
2420 | ||
c906108c SS |
2421 | char buf[MAX_REGISTER_RAW_SIZE]; |
2422 | long long reg_val; | |
2423 | ||
c5aa993b JM |
2424 | if (!know_which) |
2425 | { | |
2426 | if (CPU_PA_RISC2_0 == sysconf (_SC_CPU_VERSION)) | |
2427 | { | |
2428 | is_pa_2 = (1 == 1); | |
2429 | } | |
2430 | ||
2431 | know_which = 1; /* True */ | |
2432 | } | |
c906108c SS |
2433 | |
2434 | raw_val[0] = 0; | |
2435 | raw_val[1] = 0; | |
2436 | ||
c5aa993b JM |
2437 | if (!is_pa_2) |
2438 | { | |
2439 | raw_val[1] = *(long *) (raw_regs + REGISTER_BYTE (regnum)); | |
c906108c | 2440 | return; |
c5aa993b | 2441 | } |
c906108c SS |
2442 | |
2443 | /* Code below copied from hppah-nat.c, with fixes for wide | |
2444 | registers, using different area of save_state, etc. */ | |
2445 | if (regnum == FLAGS_REGNUM || regnum >= FP0_REGNUM || | |
c5aa993b JM |
2446 | !HAVE_STRUCT_SAVE_STATE_T || !HAVE_STRUCT_MEMBER_SS_WIDE) |
2447 | { | |
c906108c | 2448 | /* Use narrow regs area of save_state and default macro. */ |
c5aa993b JM |
2449 | offset = U_REGS_OFFSET; |
2450 | regaddr = register_addr (regnum, offset); | |
2451 | start = 1; | |
2452 | } | |
2453 | else | |
2454 | { | |
c906108c SS |
2455 | /* Use wide regs area, and calculate registers as 8 bytes wide. |
2456 | ||
2457 | We'd like to do this, but current version of "C" doesn't | |
2458 | permit "offsetof": | |
2459 | ||
c5aa993b | 2460 | offset = offsetof(save_state_t, ss_wide); |
c906108c SS |
2461 | |
2462 | Note that to avoid "C" doing typed pointer arithmetic, we | |
2463 | have to cast away the type in our offset calculation: | |
2464 | otherwise we get an offset of 1! */ | |
2465 | ||
7a292a7a | 2466 | /* NB: save_state_t is not available before HPUX 9. |
c5aa993b | 2467 | The ss_wide field is not available previous to HPUX 10.20, |
7a292a7a SS |
2468 | so to avoid compile-time warnings, we only compile this for |
2469 | PA 2.0 processors. This control path should only be followed | |
2470 | if we're debugging a PA 2.0 processor, so this should not cause | |
2471 | problems. */ | |
2472 | ||
c906108c SS |
2473 | /* #if the following code out so that this file can still be |
2474 | compiled on older HPUX boxes (< 10.20) which don't have | |
2475 | this structure/structure member. */ | |
2476 | #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1 | |
2477 | save_state_t temp; | |
2478 | ||
2479 | offset = ((int) &temp.ss_wide) - ((int) &temp); | |
2480 | regaddr = offset + regnum * 8; | |
c5aa993b | 2481 | start = 0; |
c906108c | 2482 | #endif |
c5aa993b JM |
2483 | } |
2484 | ||
2485 | for (i = start; i < 2; i++) | |
c906108c SS |
2486 | { |
2487 | errno = 0; | |
2488 | raw_val[i] = call_ptrace (PT_RUREGS, inferior_pid, | |
c5aa993b | 2489 | (PTRACE_ARG3_TYPE) regaddr, 0); |
c906108c SS |
2490 | if (errno != 0) |
2491 | { | |
2492 | /* Warning, not error, in case we are attached; sometimes the | |
2493 | kernel doesn't let us at the registers. */ | |
2494 | char *err = safe_strerror (errno); | |
2495 | char *msg = alloca (strlen (err) + 128); | |
2496 | sprintf (msg, "reading register %s: %s", REGISTER_NAME (regnum), err); | |
2497 | warning (msg); | |
2498 | goto error_exit; | |
2499 | } | |
2500 | ||
2501 | regaddr += sizeof (long); | |
2502 | } | |
c5aa993b | 2503 | |
c906108c | 2504 | if (regnum == PCOQ_HEAD_REGNUM || regnum == PCOQ_TAIL_REGNUM) |
c5aa993b | 2505 | raw_val[1] &= ~0x3; /* I think we're masking out space bits */ |
c906108c SS |
2506 | |
2507 | error_exit: | |
2508 | ; | |
2509 | } | |
2510 | ||
2511 | /* "Info all-reg" command */ | |
c5aa993b | 2512 | |
c906108c SS |
2513 | static void |
2514 | pa_print_registers (raw_regs, regnum, fpregs) | |
2515 | char *raw_regs; | |
2516 | int regnum; | |
2517 | int fpregs; | |
2518 | { | |
c5aa993b | 2519 | int i, j; |
adf40b2e JM |
2520 | /* Alas, we are compiled so that "long long" is 32 bits */ |
2521 | long raw_val[2]; | |
c906108c | 2522 | long long_val; |
a0b3c4fd | 2523 | int rows = 48, columns = 2; |
c906108c | 2524 | |
adf40b2e | 2525 | for (i = 0; i < rows; i++) |
c906108c | 2526 | { |
adf40b2e | 2527 | for (j = 0; j < columns; j++) |
c906108c | 2528 | { |
adf40b2e JM |
2529 | /* We display registers in column-major order. */ |
2530 | int regnum = i + j * rows; | |
2531 | ||
c5aa993b JM |
2532 | /* Q: Why is the value passed through "extract_signed_integer", |
2533 | while above, in "pa_do_registers_info" it isn't? | |
2534 | A: ? */ | |
adf40b2e | 2535 | pa_register_look_aside (raw_regs, regnum, &raw_val[0]); |
c5aa993b JM |
2536 | |
2537 | /* Even fancier % formats to prevent leading zeros | |
2538 | and still maintain the output in columns. */ | |
2539 | if (!is_pa_2) | |
2540 | { | |
2541 | /* Being big-endian, on this machine the low bits | |
2542 | (the ones we want to look at) are in the second longword. */ | |
2543 | long_val = extract_signed_integer (&raw_val[1], 4); | |
a0b3c4fd | 2544 | printf_filtered ("%10.10s: %8x ", |
adf40b2e | 2545 | REGISTER_NAME (regnum), long_val); |
c5aa993b JM |
2546 | } |
2547 | else | |
2548 | { | |
2549 | /* raw_val = extract_signed_integer(&raw_val, 8); */ | |
2550 | if (raw_val[0] == 0) | |
a0b3c4fd | 2551 | printf_filtered ("%10.10s: %8x ", |
adf40b2e | 2552 | REGISTER_NAME (regnum), raw_val[1]); |
c5aa993b | 2553 | else |
a0b3c4fd JM |
2554 | printf_filtered ("%10.10s: %8x%8.8x ", |
2555 | REGISTER_NAME (regnum), | |
c5aa993b JM |
2556 | raw_val[0], raw_val[1]); |
2557 | } | |
c906108c SS |
2558 | } |
2559 | printf_unfiltered ("\n"); | |
2560 | } | |
c5aa993b | 2561 | |
c906108c | 2562 | if (fpregs) |
c5aa993b | 2563 | for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ |
c906108c SS |
2564 | pa_print_fp_reg (i); |
2565 | } | |
2566 | ||
c5aa993b | 2567 | /************* new function ******************/ |
c906108c SS |
2568 | static void |
2569 | pa_strcat_registers (raw_regs, regnum, fpregs, stream) | |
2570 | char *raw_regs; | |
2571 | int regnum; | |
2572 | int fpregs; | |
2573 | GDB_FILE *stream; | |
2574 | { | |
c5aa993b JM |
2575 | int i, j; |
2576 | long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */ | |
c906108c SS |
2577 | long long_val; |
2578 | enum precision_type precision; | |
2579 | ||
2580 | precision = unspecified_precision; | |
2581 | ||
2582 | for (i = 0; i < 18; i++) | |
2583 | { | |
2584 | for (j = 0; j < 4; j++) | |
2585 | { | |
c5aa993b JM |
2586 | /* Q: Why is the value passed through "extract_signed_integer", |
2587 | while above, in "pa_do_registers_info" it isn't? | |
2588 | A: ? */ | |
2589 | pa_register_look_aside (raw_regs, i + (j * 18), &raw_val[0]); | |
2590 | ||
2591 | /* Even fancier % formats to prevent leading zeros | |
2592 | and still maintain the output in columns. */ | |
2593 | if (!is_pa_2) | |
2594 | { | |
2595 | /* Being big-endian, on this machine the low bits | |
2596 | (the ones we want to look at) are in the second longword. */ | |
2597 | long_val = extract_signed_integer (&raw_val[1], 4); | |
2598 | fprintf_filtered (stream, "%8.8s: %8x ", REGISTER_NAME (i + (j * 18)), long_val); | |
2599 | } | |
2600 | else | |
2601 | { | |
2602 | /* raw_val = extract_signed_integer(&raw_val, 8); */ | |
2603 | if (raw_val[0] == 0) | |
2604 | fprintf_filtered (stream, "%8.8s: %8x ", REGISTER_NAME (i + (j * 18)), | |
2605 | raw_val[1]); | |
2606 | else | |
2607 | fprintf_filtered (stream, "%8.8s: %8x%8.8x ", REGISTER_NAME (i + (j * 18)), | |
2608 | raw_val[0], raw_val[1]); | |
2609 | } | |
c906108c SS |
2610 | } |
2611 | fprintf_unfiltered (stream, "\n"); | |
2612 | } | |
c5aa993b | 2613 | |
c906108c | 2614 | if (fpregs) |
c5aa993b | 2615 | for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ |
c906108c SS |
2616 | pa_strcat_fp_reg (i, stream, precision); |
2617 | } | |
2618 | ||
2619 | static void | |
2620 | pa_print_fp_reg (i) | |
2621 | int i; | |
2622 | { | |
2623 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
2624 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
2625 | ||
2626 | /* Get 32bits of data. */ | |
2627 | read_relative_register_raw_bytes (i, raw_buffer); | |
2628 | ||
2629 | /* Put it in the buffer. No conversions are ever necessary. */ | |
2630 | memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); | |
2631 | ||
2632 | fputs_filtered (REGISTER_NAME (i), gdb_stdout); | |
2633 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout); | |
2634 | fputs_filtered ("(single precision) ", gdb_stdout); | |
2635 | ||
2636 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, gdb_stdout, 0, | |
2637 | 1, 0, Val_pretty_default); | |
2638 | printf_filtered ("\n"); | |
2639 | ||
2640 | /* If "i" is even, then this register can also be a double-precision | |
2641 | FP register. Dump it out as such. */ | |
2642 | if ((i % 2) == 0) | |
2643 | { | |
2644 | /* Get the data in raw format for the 2nd half. */ | |
2645 | read_relative_register_raw_bytes (i + 1, raw_buffer); | |
2646 | ||
2647 | /* Copy it into the appropriate part of the virtual buffer. */ | |
2648 | memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buffer, | |
2649 | REGISTER_RAW_SIZE (i)); | |
2650 | ||
2651 | /* Dump it as a double. */ | |
2652 | fputs_filtered (REGISTER_NAME (i), gdb_stdout); | |
2653 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout); | |
2654 | fputs_filtered ("(double precision) ", gdb_stdout); | |
2655 | ||
2656 | val_print (builtin_type_double, virtual_buffer, 0, 0, gdb_stdout, 0, | |
2657 | 1, 0, Val_pretty_default); | |
2658 | printf_filtered ("\n"); | |
2659 | } | |
2660 | } | |
2661 | ||
2662 | /*************** new function ***********************/ | |
2663 | static void | |
2664 | pa_strcat_fp_reg (i, stream, precision) | |
2665 | int i; | |
2666 | GDB_FILE *stream; | |
2667 | enum precision_type precision; | |
2668 | { | |
2669 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
2670 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
2671 | ||
2672 | fputs_filtered (REGISTER_NAME (i), stream); | |
2673 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), stream); | |
2674 | ||
2675 | /* Get 32bits of data. */ | |
2676 | read_relative_register_raw_bytes (i, raw_buffer); | |
2677 | ||
2678 | /* Put it in the buffer. No conversions are ever necessary. */ | |
2679 | memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); | |
2680 | ||
2681 | if (precision == double_precision && (i % 2) == 0) | |
2682 | { | |
2683 | ||
c5aa993b JM |
2684 | char raw_buf[MAX_REGISTER_RAW_SIZE]; |
2685 | ||
2686 | /* Get the data in raw format for the 2nd half. */ | |
2687 | read_relative_register_raw_bytes (i + 1, raw_buf); | |
2688 | ||
2689 | /* Copy it into the appropriate part of the virtual buffer. */ | |
2690 | memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buf, REGISTER_RAW_SIZE (i)); | |
c906108c | 2691 | |
c5aa993b JM |
2692 | val_print (builtin_type_double, virtual_buffer, 0, 0, stream, 0, |
2693 | 1, 0, Val_pretty_default); | |
c906108c SS |
2694 | |
2695 | } | |
c5aa993b JM |
2696 | else |
2697 | { | |
2698 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, stream, 0, | |
2699 | 1, 0, Val_pretty_default); | |
2700 | } | |
c906108c SS |
2701 | |
2702 | } | |
2703 | ||
2704 | /* Return one if PC is in the call path of a trampoline, else return zero. | |
2705 | ||
2706 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
2707 | just shared library trampolines (import, export). */ | |
2708 | ||
2709 | int | |
2710 | in_solib_call_trampoline (pc, name) | |
2711 | CORE_ADDR pc; | |
2712 | char *name; | |
2713 | { | |
2714 | struct minimal_symbol *minsym; | |
2715 | struct unwind_table_entry *u; | |
2716 | static CORE_ADDR dyncall = 0; | |
2717 | static CORE_ADDR sr4export = 0; | |
2718 | ||
2719 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a | |
2720 | new exec file */ | |
2721 | ||
2722 | /* First see if PC is in one of the two C-library trampolines. */ | |
2723 | if (!dyncall) | |
2724 | { | |
2725 | minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
2726 | if (minsym) | |
2727 | dyncall = SYMBOL_VALUE_ADDRESS (minsym); | |
2728 | else | |
2729 | dyncall = -1; | |
2730 | } | |
2731 | ||
2732 | if (!sr4export) | |
2733 | { | |
2734 | minsym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2735 | if (minsym) | |
2736 | sr4export = SYMBOL_VALUE_ADDRESS (minsym); | |
2737 | else | |
2738 | sr4export = -1; | |
2739 | } | |
2740 | ||
2741 | if (pc == dyncall || pc == sr4export) | |
2742 | return 1; | |
2743 | ||
2744 | /* Get the unwind descriptor corresponding to PC, return zero | |
2745 | if no unwind was found. */ | |
2746 | u = find_unwind_entry (pc); | |
2747 | if (!u) | |
2748 | return 0; | |
2749 | ||
2750 | /* If this isn't a linker stub, then return now. */ | |
2751 | if (u->stub_unwind.stub_type == 0) | |
2752 | return 0; | |
2753 | ||
2754 | /* By definition a long-branch stub is a call stub. */ | |
2755 | if (u->stub_unwind.stub_type == LONG_BRANCH) | |
2756 | return 1; | |
2757 | ||
2758 | /* The call and return path execute the same instructions within | |
2759 | an IMPORT stub! So an IMPORT stub is both a call and return | |
2760 | trampoline. */ | |
2761 | if (u->stub_unwind.stub_type == IMPORT) | |
2762 | return 1; | |
2763 | ||
2764 | /* Parameter relocation stubs always have a call path and may have a | |
2765 | return path. */ | |
2766 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
2767 | || u->stub_unwind.stub_type == EXPORT) | |
2768 | { | |
2769 | CORE_ADDR addr; | |
2770 | ||
2771 | /* Search forward from the current PC until we hit a branch | |
c5aa993b | 2772 | or the end of the stub. */ |
c906108c SS |
2773 | for (addr = pc; addr <= u->region_end; addr += 4) |
2774 | { | |
2775 | unsigned long insn; | |
2776 | ||
2777 | insn = read_memory_integer (addr, 4); | |
2778 | ||
2779 | /* Does it look like a bl? If so then it's the call path, if | |
2780 | we find a bv or be first, then we're on the return path. */ | |
2781 | if ((insn & 0xfc00e000) == 0xe8000000) | |
2782 | return 1; | |
2783 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
2784 | || (insn & 0xfc000000) == 0xe0000000) | |
2785 | return 0; | |
2786 | } | |
2787 | ||
2788 | /* Should never happen. */ | |
c5aa993b JM |
2789 | warning ("Unable to find branch in parameter relocation stub.\n"); /* purecov: deadcode */ |
2790 | return 0; /* purecov: deadcode */ | |
c906108c SS |
2791 | } |
2792 | ||
2793 | /* Unknown stub type. For now, just return zero. */ | |
c5aa993b | 2794 | return 0; /* purecov: deadcode */ |
c906108c SS |
2795 | } |
2796 | ||
2797 | /* Return one if PC is in the return path of a trampoline, else return zero. | |
2798 | ||
2799 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
2800 | just shared library trampolines (import, export). */ | |
2801 | ||
2802 | int | |
2803 | in_solib_return_trampoline (pc, name) | |
2804 | CORE_ADDR pc; | |
2805 | char *name; | |
2806 | { | |
2807 | struct unwind_table_entry *u; | |
2808 | ||
2809 | /* Get the unwind descriptor corresponding to PC, return zero | |
2810 | if no unwind was found. */ | |
2811 | u = find_unwind_entry (pc); | |
2812 | if (!u) | |
2813 | return 0; | |
2814 | ||
2815 | /* If this isn't a linker stub or it's just a long branch stub, then | |
2816 | return zero. */ | |
2817 | if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) | |
2818 | return 0; | |
2819 | ||
2820 | /* The call and return path execute the same instructions within | |
2821 | an IMPORT stub! So an IMPORT stub is both a call and return | |
2822 | trampoline. */ | |
2823 | if (u->stub_unwind.stub_type == IMPORT) | |
2824 | return 1; | |
2825 | ||
2826 | /* Parameter relocation stubs always have a call path and may have a | |
2827 | return path. */ | |
2828 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
2829 | || u->stub_unwind.stub_type == EXPORT) | |
2830 | { | |
2831 | CORE_ADDR addr; | |
2832 | ||
2833 | /* Search forward from the current PC until we hit a branch | |
c5aa993b | 2834 | or the end of the stub. */ |
c906108c SS |
2835 | for (addr = pc; addr <= u->region_end; addr += 4) |
2836 | { | |
2837 | unsigned long insn; | |
2838 | ||
2839 | insn = read_memory_integer (addr, 4); | |
2840 | ||
2841 | /* Does it look like a bl? If so then it's the call path, if | |
2842 | we find a bv or be first, then we're on the return path. */ | |
2843 | if ((insn & 0xfc00e000) == 0xe8000000) | |
2844 | return 0; | |
2845 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
2846 | || (insn & 0xfc000000) == 0xe0000000) | |
2847 | return 1; | |
2848 | } | |
2849 | ||
2850 | /* Should never happen. */ | |
c5aa993b JM |
2851 | warning ("Unable to find branch in parameter relocation stub.\n"); /* purecov: deadcode */ |
2852 | return 0; /* purecov: deadcode */ | |
c906108c SS |
2853 | } |
2854 | ||
2855 | /* Unknown stub type. For now, just return zero. */ | |
c5aa993b | 2856 | return 0; /* purecov: deadcode */ |
c906108c SS |
2857 | |
2858 | } | |
2859 | ||
2860 | /* Figure out if PC is in a trampoline, and if so find out where | |
2861 | the trampoline will jump to. If not in a trampoline, return zero. | |
2862 | ||
2863 | Simple code examination probably is not a good idea since the code | |
2864 | sequences in trampolines can also appear in user code. | |
2865 | ||
2866 | We use unwinds and information from the minimal symbol table to | |
2867 | determine when we're in a trampoline. This won't work for ELF | |
2868 | (yet) since it doesn't create stub unwind entries. Whether or | |
2869 | not ELF will create stub unwinds or normal unwinds for linker | |
2870 | stubs is still being debated. | |
2871 | ||
2872 | This should handle simple calls through dyncall or sr4export, | |
2873 | long calls, argument relocation stubs, and dyncall/sr4export | |
2874 | calling an argument relocation stub. It even handles some stubs | |
2875 | used in dynamic executables. */ | |
2876 | ||
c5aa993b | 2877 | #if 0 |
c906108c SS |
2878 | CORE_ADDR |
2879 | skip_trampoline_code (pc, name) | |
2880 | CORE_ADDR pc; | |
2881 | char *name; | |
2882 | { | |
c5aa993b | 2883 | return find_solib_trampoline_target (pc); |
c906108c SS |
2884 | } |
2885 | ||
2886 | #endif | |
2887 | ||
2888 | CORE_ADDR | |
2889 | skip_trampoline_code (pc, name) | |
2890 | CORE_ADDR pc; | |
2891 | char *name; | |
2892 | { | |
2893 | long orig_pc = pc; | |
2894 | long prev_inst, curr_inst, loc; | |
2895 | static CORE_ADDR dyncall = 0; | |
2896 | static CORE_ADDR dyncall_external = 0; | |
2897 | static CORE_ADDR sr4export = 0; | |
2898 | struct minimal_symbol *msym; | |
2899 | struct unwind_table_entry *u; | |
2900 | ||
2901 | ||
2902 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a | |
2903 | new exec file */ | |
2904 | ||
2905 | if (!dyncall) | |
2906 | { | |
2907 | msym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
2908 | if (msym) | |
2909 | dyncall = SYMBOL_VALUE_ADDRESS (msym); | |
2910 | else | |
2911 | dyncall = -1; | |
2912 | } | |
2913 | ||
2914 | if (!dyncall_external) | |
2915 | { | |
2916 | msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL); | |
2917 | if (msym) | |
2918 | dyncall_external = SYMBOL_VALUE_ADDRESS (msym); | |
2919 | else | |
2920 | dyncall_external = -1; | |
2921 | } | |
2922 | ||
2923 | if (!sr4export) | |
2924 | { | |
2925 | msym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2926 | if (msym) | |
2927 | sr4export = SYMBOL_VALUE_ADDRESS (msym); | |
2928 | else | |
2929 | sr4export = -1; | |
2930 | } | |
2931 | ||
2932 | /* Addresses passed to dyncall may *NOT* be the actual address | |
2933 | of the function. So we may have to do something special. */ | |
2934 | if (pc == dyncall) | |
2935 | { | |
2936 | pc = (CORE_ADDR) read_register (22); | |
2937 | ||
2938 | /* If bit 30 (counting from the left) is on, then pc is the address of | |
c5aa993b JM |
2939 | the PLT entry for this function, not the address of the function |
2940 | itself. Bit 31 has meaning too, but only for MPE. */ | |
c906108c SS |
2941 | if (pc & 0x2) |
2942 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, 4); | |
2943 | } | |
2944 | if (pc == dyncall_external) | |
2945 | { | |
2946 | pc = (CORE_ADDR) read_register (22); | |
2947 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, 4); | |
2948 | } | |
2949 | else if (pc == sr4export) | |
2950 | pc = (CORE_ADDR) (read_register (22)); | |
2951 | ||
2952 | /* Get the unwind descriptor corresponding to PC, return zero | |
2953 | if no unwind was found. */ | |
2954 | u = find_unwind_entry (pc); | |
2955 | if (!u) | |
2956 | return 0; | |
2957 | ||
2958 | /* If this isn't a linker stub, then return now. */ | |
2959 | /* elz: attention here! (FIXME) because of a compiler/linker | |
2960 | error, some stubs which should have a non zero stub_unwind.stub_type | |
2961 | have unfortunately a value of zero. So this function would return here | |
2962 | as if we were not in a trampoline. To fix this, we go look at the partial | |
2963 | symbol information, which reports this guy as a stub. | |
2964 | (FIXME): Unfortunately, we are not that lucky: it turns out that the | |
2965 | partial symbol information is also wrong sometimes. This is because | |
2966 | when it is entered (somread.c::som_symtab_read()) it can happen that | |
2967 | if the type of the symbol (from the som) is Entry, and the symbol is | |
2968 | in a shared library, then it can also be a trampoline. This would | |
2969 | be OK, except that I believe the way they decide if we are ina shared library | |
2970 | does not work. SOOOO..., even if we have a regular function w/o trampolines | |
2971 | its minimal symbol can be assigned type mst_solib_trampoline. | |
2972 | Also, if we find that the symbol is a real stub, then we fix the unwind | |
2973 | descriptor, and define the stub type to be EXPORT. | |
c5aa993b | 2974 | Hopefully this is correct most of the times. */ |
c906108c | 2975 | if (u->stub_unwind.stub_type == 0) |
c5aa993b | 2976 | { |
c906108c SS |
2977 | |
2978 | /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed | |
2979 | we can delete all the code which appears between the lines */ | |
2980 | /*--------------------------------------------------------------------------*/ | |
c5aa993b | 2981 | msym = lookup_minimal_symbol_by_pc (pc); |
c906108c | 2982 | |
c5aa993b JM |
2983 | if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) |
2984 | return orig_pc == pc ? 0 : pc & ~0x3; | |
2985 | ||
2986 | else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) | |
2987 | { | |
2988 | struct objfile *objfile; | |
2989 | struct minimal_symbol *msymbol; | |
2990 | int function_found = 0; | |
2991 | ||
2992 | /* go look if there is another minimal symbol with the same name as | |
2993 | this one, but with type mst_text. This would happen if the msym | |
2994 | is an actual trampoline, in which case there would be another | |
2995 | symbol with the same name corresponding to the real function */ | |
2996 | ||
2997 | ALL_MSYMBOLS (objfile, msymbol) | |
2998 | { | |
2999 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
3000 | && STREQ (SYMBOL_NAME (msymbol), SYMBOL_NAME (msym))) | |
3001 | { | |
3002 | function_found = 1; | |
3003 | break; | |
3004 | } | |
3005 | } | |
3006 | ||
3007 | if (function_found) | |
3008 | /* the type of msym is correct (mst_solib_trampoline), but | |
3009 | the unwind info is wrong, so set it to the correct value */ | |
3010 | u->stub_unwind.stub_type = EXPORT; | |
3011 | else | |
3012 | /* the stub type info in the unwind is correct (this is not a | |
3013 | trampoline), but the msym type information is wrong, it | |
3014 | should be mst_text. So we need to fix the msym, and also | |
3015 | get out of this function */ | |
3016 | { | |
3017 | MSYMBOL_TYPE (msym) = mst_text; | |
3018 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3019 | } | |
3020 | } | |
c906108c | 3021 | |
c906108c | 3022 | /*--------------------------------------------------------------------------*/ |
c5aa993b | 3023 | } |
c906108c SS |
3024 | |
3025 | /* It's a stub. Search for a branch and figure out where it goes. | |
3026 | Note we have to handle multi insn branch sequences like ldil;ble. | |
3027 | Most (all?) other branches can be determined by examining the contents | |
3028 | of certain registers and the stack. */ | |
3029 | ||
3030 | loc = pc; | |
3031 | curr_inst = 0; | |
3032 | prev_inst = 0; | |
3033 | while (1) | |
3034 | { | |
3035 | /* Make sure we haven't walked outside the range of this stub. */ | |
3036 | if (u != find_unwind_entry (loc)) | |
3037 | { | |
3038 | warning ("Unable to find branch in linker stub"); | |
3039 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3040 | } | |
3041 | ||
3042 | prev_inst = curr_inst; | |
3043 | curr_inst = read_memory_integer (loc, 4); | |
3044 | ||
3045 | /* Does it look like a branch external using %r1? Then it's the | |
c5aa993b | 3046 | branch from the stub to the actual function. */ |
c906108c SS |
3047 | if ((curr_inst & 0xffe0e000) == 0xe0202000) |
3048 | { | |
3049 | /* Yup. See if the previous instruction loaded | |
3050 | a value into %r1. If so compute and return the jump address. */ | |
3051 | if ((prev_inst & 0xffe00000) == 0x20200000) | |
3052 | return (extract_21 (prev_inst) + extract_17 (curr_inst)) & ~0x3; | |
3053 | else | |
3054 | { | |
3055 | warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."); | |
3056 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3057 | } | |
3058 | } | |
3059 | ||
3060 | /* Does it look like a be 0(sr0,%r21)? OR | |
3061 | Does it look like a be, n 0(sr0,%r21)? OR | |
3062 | Does it look like a bve (r21)? (this is on PA2.0) | |
3063 | Does it look like a bve, n(r21)? (this is also on PA2.0) | |
3064 | That's the branch from an | |
c5aa993b | 3065 | import stub to an export stub. |
c906108c | 3066 | |
c5aa993b JM |
3067 | It is impossible to determine the target of the branch via |
3068 | simple examination of instructions and/or data (consider | |
3069 | that the address in the plabel may be the address of the | |
3070 | bind-on-reference routine in the dynamic loader). | |
c906108c | 3071 | |
c5aa993b | 3072 | So we have try an alternative approach. |
c906108c | 3073 | |
c5aa993b JM |
3074 | Get the name of the symbol at our current location; it should |
3075 | be a stub symbol with the same name as the symbol in the | |
3076 | shared library. | |
c906108c | 3077 | |
c5aa993b JM |
3078 | Then lookup a minimal symbol with the same name; we should |
3079 | get the minimal symbol for the target routine in the shared | |
3080 | library as those take precedence of import/export stubs. */ | |
c906108c | 3081 | if ((curr_inst == 0xe2a00000) || |
c5aa993b JM |
3082 | (curr_inst == 0xe2a00002) || |
3083 | (curr_inst == 0xeaa0d000) || | |
3084 | (curr_inst == 0xeaa0d002)) | |
c906108c SS |
3085 | { |
3086 | struct minimal_symbol *stubsym, *libsym; | |
3087 | ||
3088 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
3089 | if (stubsym == NULL) | |
3090 | { | |
3091 | warning ("Unable to find symbol for 0x%x", loc); | |
3092 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3093 | } | |
3094 | ||
3095 | libsym = lookup_minimal_symbol (SYMBOL_NAME (stubsym), NULL, NULL); | |
3096 | if (libsym == NULL) | |
3097 | { | |
3098 | warning ("Unable to find library symbol for %s\n", | |
3099 | SYMBOL_NAME (stubsym)); | |
3100 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3101 | } | |
3102 | ||
3103 | return SYMBOL_VALUE (libsym); | |
3104 | } | |
3105 | ||
3106 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a | |
c5aa993b JM |
3107 | branch from the stub to the actual function. */ |
3108 | /*elz */ | |
c906108c SS |
3109 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 |
3110 | || (curr_inst & 0xffe0e000) == 0xe8000000 | |
c5aa993b | 3111 | || (curr_inst & 0xffe0e000) == 0xe800A000) |
c906108c SS |
3112 | return (loc + extract_17 (curr_inst) + 8) & ~0x3; |
3113 | ||
3114 | /* Does it look like bv (rp)? Note this depends on the | |
c5aa993b JM |
3115 | current stack pointer being the same as the stack |
3116 | pointer in the stub itself! This is a branch on from the | |
3117 | stub back to the original caller. */ | |
3118 | /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */ | |
c906108c SS |
3119 | else if ((curr_inst & 0xffe0f000) == 0xe840c000) |
3120 | { | |
3121 | /* Yup. See if the previous instruction loaded | |
3122 | rp from sp - 8. */ | |
3123 | if (prev_inst == 0x4bc23ff1) | |
3124 | return (read_memory_integer | |
3125 | (read_register (SP_REGNUM) - 8, 4)) & ~0x3; | |
3126 | else | |
3127 | { | |
3128 | warning ("Unable to find restore of %%rp before bv (%%rp)."); | |
3129 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3130 | } | |
3131 | } | |
3132 | ||
3133 | /* elz: added this case to capture the new instruction | |
3134 | at the end of the return part of an export stub used by | |
3135 | the PA2.0: BVE, n (rp) */ | |
3136 | else if ((curr_inst & 0xffe0f000) == 0xe840d000) | |
3137 | { | |
c5aa993b | 3138 | return (read_memory_integer |
c906108c SS |
3139 | (read_register (SP_REGNUM) - 24, 4)) & ~0x3; |
3140 | } | |
3141 | ||
3142 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
c5aa993b | 3143 | the original caller from the stub. Used in dynamic executables. */ |
c906108c SS |
3144 | else if (curr_inst == 0xe0400002) |
3145 | { | |
3146 | /* The value we jump to is sitting in sp - 24. But that's | |
3147 | loaded several instructions before the be instruction. | |
3148 | I guess we could check for the previous instruction being | |
3149 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
c5aa993b | 3150 | return (read_memory_integer |
c906108c SS |
3151 | (read_register (SP_REGNUM) - 24, 4)) & ~0x3; |
3152 | } | |
3153 | ||
3154 | /* Haven't found the branch yet, but we're still in the stub. | |
c5aa993b | 3155 | Keep looking. */ |
c906108c SS |
3156 | loc += 4; |
3157 | } | |
3158 | } | |
3159 | ||
3160 | ||
3161 | /* For the given instruction (INST), return any adjustment it makes | |
3162 | to the stack pointer or zero for no adjustment. | |
3163 | ||
3164 | This only handles instructions commonly found in prologues. */ | |
3165 | ||
3166 | static int | |
3167 | prologue_inst_adjust_sp (inst) | |
3168 | unsigned long inst; | |
3169 | { | |
3170 | /* This must persist across calls. */ | |
3171 | static int save_high21; | |
3172 | ||
3173 | /* The most common way to perform a stack adjustment ldo X(sp),sp */ | |
3174 | if ((inst & 0xffffc000) == 0x37de0000) | |
3175 | return extract_14 (inst); | |
3176 | ||
3177 | /* stwm X,D(sp) */ | |
3178 | if ((inst & 0xffe00000) == 0x6fc00000) | |
3179 | return extract_14 (inst); | |
3180 | ||
3181 | /* addil high21,%r1; ldo low11,(%r1),%r30) | |
3182 | save high bits in save_high21 for later use. */ | |
3183 | if ((inst & 0xffe00000) == 0x28200000) | |
3184 | { | |
3185 | save_high21 = extract_21 (inst); | |
3186 | return 0; | |
3187 | } | |
3188 | ||
3189 | if ((inst & 0xffff0000) == 0x343e0000) | |
3190 | return save_high21 + extract_14 (inst); | |
3191 | ||
3192 | /* fstws as used by the HP compilers. */ | |
3193 | if ((inst & 0xffffffe0) == 0x2fd01220) | |
3194 | return extract_5_load (inst); | |
3195 | ||
3196 | /* No adjustment. */ | |
3197 | return 0; | |
3198 | } | |
3199 | ||
3200 | /* Return nonzero if INST is a branch of some kind, else return zero. */ | |
3201 | ||
3202 | static int | |
3203 | is_branch (inst) | |
3204 | unsigned long inst; | |
3205 | { | |
3206 | switch (inst >> 26) | |
3207 | { | |
3208 | case 0x20: | |
3209 | case 0x21: | |
3210 | case 0x22: | |
3211 | case 0x23: | |
3212 | case 0x28: | |
3213 | case 0x29: | |
3214 | case 0x2a: | |
3215 | case 0x2b: | |
3216 | case 0x30: | |
3217 | case 0x31: | |
3218 | case 0x32: | |
3219 | case 0x33: | |
3220 | case 0x38: | |
3221 | case 0x39: | |
3222 | case 0x3a: | |
3223 | return 1; | |
3224 | ||
3225 | default: | |
3226 | return 0; | |
3227 | } | |
3228 | } | |
3229 | ||
3230 | /* Return the register number for a GR which is saved by INST or | |
3231 | zero it INST does not save a GR. */ | |
3232 | ||
3233 | static int | |
3234 | inst_saves_gr (inst) | |
3235 | unsigned long inst; | |
3236 | { | |
3237 | /* Does it look like a stw? */ | |
3238 | if ((inst >> 26) == 0x1a) | |
3239 | return extract_5R_store (inst); | |
3240 | ||
3241 | /* Does it look like a stwm? GCC & HPC may use this in prologues. */ | |
3242 | if ((inst >> 26) == 0x1b) | |
3243 | return extract_5R_store (inst); | |
3244 | ||
3245 | /* Does it look like sth or stb? HPC versions 9.0 and later use these | |
3246 | too. */ | |
3247 | if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18) | |
3248 | return extract_5R_store (inst); | |
c5aa993b | 3249 | |
c906108c SS |
3250 | return 0; |
3251 | } | |
3252 | ||
3253 | /* Return the register number for a FR which is saved by INST or | |
3254 | zero it INST does not save a FR. | |
3255 | ||
3256 | Note we only care about full 64bit register stores (that's the only | |
3257 | kind of stores the prologue will use). | |
3258 | ||
3259 | FIXME: What about argument stores with the HP compiler in ANSI mode? */ | |
3260 | ||
3261 | static int | |
3262 | inst_saves_fr (inst) | |
3263 | unsigned long inst; | |
3264 | { | |
c5aa993b | 3265 | /* is this an FSTDS ? */ |
c906108c SS |
3266 | if ((inst & 0xfc00dfc0) == 0x2c001200) |
3267 | return extract_5r_store (inst); | |
c5aa993b | 3268 | /* is this an FSTWS ? */ |
c906108c SS |
3269 | if ((inst & 0xfc00df80) == 0x24001200) |
3270 | return extract_5r_store (inst); | |
3271 | return 0; | |
3272 | } | |
3273 | ||
3274 | /* Advance PC across any function entry prologue instructions | |
3275 | to reach some "real" code. | |
3276 | ||
3277 | Use information in the unwind table to determine what exactly should | |
3278 | be in the prologue. */ | |
3279 | ||
3280 | ||
3281 | CORE_ADDR | |
3282 | skip_prologue_hard_way (pc) | |
3283 | CORE_ADDR pc; | |
3284 | { | |
3285 | char buf[4]; | |
3286 | CORE_ADDR orig_pc = pc; | |
3287 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; | |
3288 | unsigned long args_stored, status, i, restart_gr, restart_fr; | |
3289 | struct unwind_table_entry *u; | |
3290 | ||
3291 | restart_gr = 0; | |
3292 | restart_fr = 0; | |
3293 | ||
3294 | restart: | |
3295 | u = find_unwind_entry (pc); | |
3296 | if (!u) | |
3297 | return pc; | |
3298 | ||
c5aa993b | 3299 | /* If we are not at the beginning of a function, then return now. */ |
c906108c SS |
3300 | if ((pc & ~0x3) != u->region_start) |
3301 | return pc; | |
3302 | ||
3303 | /* This is how much of a frame adjustment we need to account for. */ | |
3304 | stack_remaining = u->Total_frame_size << 3; | |
3305 | ||
3306 | /* Magic register saves we want to know about. */ | |
3307 | save_rp = u->Save_RP; | |
3308 | save_sp = u->Save_SP; | |
3309 | ||
3310 | /* An indication that args may be stored into the stack. Unfortunately | |
3311 | the HPUX compilers tend to set this in cases where no args were | |
3312 | stored too!. */ | |
3313 | args_stored = 1; | |
3314 | ||
3315 | /* Turn the Entry_GR field into a bitmask. */ | |
3316 | save_gr = 0; | |
3317 | for (i = 3; i < u->Entry_GR + 3; i++) | |
3318 | { | |
3319 | /* Frame pointer gets saved into a special location. */ | |
3320 | if (u->Save_SP && i == FP_REGNUM) | |
3321 | continue; | |
3322 | ||
3323 | save_gr |= (1 << i); | |
3324 | } | |
3325 | save_gr &= ~restart_gr; | |
3326 | ||
3327 | /* Turn the Entry_FR field into a bitmask too. */ | |
3328 | save_fr = 0; | |
3329 | for (i = 12; i < u->Entry_FR + 12; i++) | |
3330 | save_fr |= (1 << i); | |
3331 | save_fr &= ~restart_fr; | |
3332 | ||
3333 | /* Loop until we find everything of interest or hit a branch. | |
3334 | ||
3335 | For unoptimized GCC code and for any HP CC code this will never ever | |
3336 | examine any user instructions. | |
3337 | ||
3338 | For optimzied GCC code we're faced with problems. GCC will schedule | |
3339 | its prologue and make prologue instructions available for delay slot | |
3340 | filling. The end result is user code gets mixed in with the prologue | |
3341 | and a prologue instruction may be in the delay slot of the first branch | |
3342 | or call. | |
3343 | ||
3344 | Some unexpected things are expected with debugging optimized code, so | |
3345 | we allow this routine to walk past user instructions in optimized | |
3346 | GCC code. */ | |
3347 | while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0 | |
3348 | || args_stored) | |
3349 | { | |
3350 | unsigned int reg_num; | |
3351 | unsigned long old_stack_remaining, old_save_gr, old_save_fr; | |
3352 | unsigned long old_save_rp, old_save_sp, next_inst; | |
3353 | ||
3354 | /* Save copies of all the triggers so we can compare them later | |
c5aa993b | 3355 | (only for HPC). */ |
c906108c SS |
3356 | old_save_gr = save_gr; |
3357 | old_save_fr = save_fr; | |
3358 | old_save_rp = save_rp; | |
3359 | old_save_sp = save_sp; | |
3360 | old_stack_remaining = stack_remaining; | |
3361 | ||
3362 | status = target_read_memory (pc, buf, 4); | |
3363 | inst = extract_unsigned_integer (buf, 4); | |
c5aa993b | 3364 | |
c906108c SS |
3365 | /* Yow! */ |
3366 | if (status != 0) | |
3367 | return pc; | |
3368 | ||
3369 | /* Note the interesting effects of this instruction. */ | |
3370 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
3371 | ||
3372 | /* There is only one instruction used for saving RP into the stack. */ | |
3373 | if (inst == 0x6bc23fd9) | |
3374 | save_rp = 0; | |
3375 | ||
3376 | /* This is the only way we save SP into the stack. At this time | |
c5aa993b | 3377 | the HP compilers never bother to save SP into the stack. */ |
c906108c SS |
3378 | if ((inst & 0xffffc000) == 0x6fc10000) |
3379 | save_sp = 0; | |
3380 | ||
3381 | /* Account for general and floating-point register saves. */ | |
3382 | reg_num = inst_saves_gr (inst); | |
3383 | save_gr &= ~(1 << reg_num); | |
3384 | ||
3385 | /* Ugh. Also account for argument stores into the stack. | |
c5aa993b JM |
3386 | Unfortunately args_stored only tells us that some arguments |
3387 | where stored into the stack. Not how many or what kind! | |
c906108c | 3388 | |
c5aa993b JM |
3389 | This is a kludge as on the HP compiler sets this bit and it |
3390 | never does prologue scheduling. So once we see one, skip past | |
3391 | all of them. We have similar code for the fp arg stores below. | |
c906108c | 3392 | |
c5aa993b JM |
3393 | FIXME. Can still die if we have a mix of GR and FR argument |
3394 | stores! */ | |
c906108c SS |
3395 | if (reg_num >= 23 && reg_num <= 26) |
3396 | { | |
3397 | while (reg_num >= 23 && reg_num <= 26) | |
3398 | { | |
3399 | pc += 4; | |
3400 | status = target_read_memory (pc, buf, 4); | |
3401 | inst = extract_unsigned_integer (buf, 4); | |
3402 | if (status != 0) | |
3403 | return pc; | |
3404 | reg_num = inst_saves_gr (inst); | |
3405 | } | |
3406 | args_stored = 0; | |
3407 | continue; | |
3408 | } | |
3409 | ||
3410 | reg_num = inst_saves_fr (inst); | |
3411 | save_fr &= ~(1 << reg_num); | |
3412 | ||
3413 | status = target_read_memory (pc + 4, buf, 4); | |
3414 | next_inst = extract_unsigned_integer (buf, 4); | |
c5aa993b | 3415 | |
c906108c SS |
3416 | /* Yow! */ |
3417 | if (status != 0) | |
3418 | return pc; | |
3419 | ||
3420 | /* We've got to be read to handle the ldo before the fp register | |
c5aa993b | 3421 | save. */ |
c906108c SS |
3422 | if ((inst & 0xfc000000) == 0x34000000 |
3423 | && inst_saves_fr (next_inst) >= 4 | |
3424 | && inst_saves_fr (next_inst) <= 7) | |
3425 | { | |
3426 | /* So we drop into the code below in a reasonable state. */ | |
3427 | reg_num = inst_saves_fr (next_inst); | |
3428 | pc -= 4; | |
3429 | } | |
3430 | ||
3431 | /* Ugh. Also account for argument stores into the stack. | |
c5aa993b JM |
3432 | This is a kludge as on the HP compiler sets this bit and it |
3433 | never does prologue scheduling. So once we see one, skip past | |
3434 | all of them. */ | |
c906108c SS |
3435 | if (reg_num >= 4 && reg_num <= 7) |
3436 | { | |
3437 | while (reg_num >= 4 && reg_num <= 7) | |
3438 | { | |
3439 | pc += 8; | |
3440 | status = target_read_memory (pc, buf, 4); | |
3441 | inst = extract_unsigned_integer (buf, 4); | |
3442 | if (status != 0) | |
3443 | return pc; | |
3444 | if ((inst & 0xfc000000) != 0x34000000) | |
3445 | break; | |
3446 | status = target_read_memory (pc + 4, buf, 4); | |
3447 | next_inst = extract_unsigned_integer (buf, 4); | |
3448 | if (status != 0) | |
3449 | return pc; | |
3450 | reg_num = inst_saves_fr (next_inst); | |
3451 | } | |
3452 | args_stored = 0; | |
3453 | continue; | |
3454 | } | |
3455 | ||
3456 | /* Quit if we hit any kind of branch. This can happen if a prologue | |
c5aa993b | 3457 | instruction is in the delay slot of the first call/branch. */ |
c906108c SS |
3458 | if (is_branch (inst)) |
3459 | break; | |
3460 | ||
3461 | /* What a crock. The HP compilers set args_stored even if no | |
c5aa993b JM |
3462 | arguments were stored into the stack (boo hiss). This could |
3463 | cause this code to then skip a bunch of user insns (up to the | |
3464 | first branch). | |
3465 | ||
3466 | To combat this we try to identify when args_stored was bogusly | |
3467 | set and clear it. We only do this when args_stored is nonzero, | |
3468 | all other resources are accounted for, and nothing changed on | |
3469 | this pass. */ | |
c906108c | 3470 | if (args_stored |
c5aa993b | 3471 | && !(save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) |
c906108c SS |
3472 | && old_save_gr == save_gr && old_save_fr == save_fr |
3473 | && old_save_rp == save_rp && old_save_sp == save_sp | |
3474 | && old_stack_remaining == stack_remaining) | |
3475 | break; | |
c5aa993b | 3476 | |
c906108c SS |
3477 | /* Bump the PC. */ |
3478 | pc += 4; | |
3479 | } | |
3480 | ||
3481 | /* We've got a tenative location for the end of the prologue. However | |
3482 | because of limitations in the unwind descriptor mechanism we may | |
3483 | have went too far into user code looking for the save of a register | |
3484 | that does not exist. So, if there registers we expected to be saved | |
3485 | but never were, mask them out and restart. | |
3486 | ||
3487 | This should only happen in optimized code, and should be very rare. */ | |
c5aa993b | 3488 | if (save_gr || (save_fr && !(restart_fr || restart_gr))) |
c906108c SS |
3489 | { |
3490 | pc = orig_pc; | |
3491 | restart_gr = save_gr; | |
3492 | restart_fr = save_fr; | |
3493 | goto restart; | |
3494 | } | |
3495 | ||
3496 | return pc; | |
3497 | } | |
3498 | ||
3499 | ||
3500 | ||
3501 | ||
3502 | ||
3503 | /* return 0 if we cannot determine the end of the prologue, | |
3504 | return the new pc value if we know where the prologue ends */ | |
3505 | ||
3506 | static CORE_ADDR | |
3507 | after_prologue (pc) | |
3508 | CORE_ADDR pc; | |
3509 | { | |
3510 | struct symtab_and_line sal; | |
3511 | CORE_ADDR func_addr, func_end; | |
3512 | struct symbol *f; | |
3513 | ||
3514 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
c5aa993b | 3515 | return 0; /* Unknown */ |
c906108c SS |
3516 | |
3517 | f = find_pc_function (pc); | |
3518 | if (!f) | |
3519 | return 0; /* no debug info, do it the hard way! */ | |
3520 | ||
3521 | sal = find_pc_line (func_addr, 0); | |
3522 | ||
3523 | if (sal.end < func_end) | |
c5aa993b JM |
3524 | { |
3525 | /* this happens when the function has no prologue, because the way | |
3526 | find_pc_line works: elz. Note: this may not be a very good | |
3527 | way to decide whether a function has a prologue or not, but | |
3528 | it is the best I can do with the info available | |
3529 | Also, this will work for functions like: int f() | |
3530 | { | |
3531 | return 2; | |
3532 | } | |
3533 | I.e. the bp will be inserted at the first open brace. | |
3534 | For functions where the body is only one line written like this: | |
3535 | int f() | |
3536 | { return 2; } | |
3537 | this will make the breakpoint to be at the last brace, after the body | |
3538 | has been executed already. What's the point of stepping through a function | |
3539 | without any variables anyway?? */ | |
3540 | ||
3541 | if ((SYMBOL_LINE (f) > 0) && (SYMBOL_LINE (f) < sal.line)) | |
3542 | return pc; /*no adjusment will be made */ | |
3543 | else | |
3544 | return sal.end; /* this is the end of the prologue */ | |
3545 | } | |
c906108c SS |
3546 | /* The line after the prologue is after the end of the function. In this |
3547 | case, put the end of the prologue is the beginning of the function. */ | |
3548 | /* This should happen only when the function is prologueless and has no | |
3549 | code in it. For instance void dumb(){} Note: this kind of function | |
3550 | is used quite a lot in the test system */ | |
3551 | ||
c5aa993b JM |
3552 | else |
3553 | return pc; /* no adjustment will be made */ | |
c906108c SS |
3554 | } |
3555 | ||
3556 | /* To skip prologues, I use this predicate. Returns either PC itself | |
3557 | if the code at PC does not look like a function prologue; otherwise | |
3558 | returns an address that (if we're lucky) follows the prologue. If | |
3559 | LENIENT, then we must skip everything which is involved in setting | |
3560 | up the frame (it's OK to skip more, just so long as we don't skip | |
3561 | anything which might clobber the registers which are being saved. | |
3562 | Currently we must not skip more on the alpha, but we might the lenient | |
3563 | stuff some day. */ | |
3564 | ||
3565 | CORE_ADDR | |
b83266a0 | 3566 | hppa_skip_prologue (pc) |
c906108c SS |
3567 | CORE_ADDR pc; |
3568 | { | |
c5aa993b JM |
3569 | unsigned long inst; |
3570 | int offset; | |
3571 | CORE_ADDR post_prologue_pc; | |
3572 | char buf[4]; | |
c906108c SS |
3573 | |
3574 | #ifdef GDB_TARGET_HAS_SHARED_LIBS | |
c5aa993b JM |
3575 | /* Silently return the unaltered pc upon memory errors. |
3576 | This could happen on OSF/1 if decode_line_1 tries to skip the | |
3577 | prologue for quickstarted shared library functions when the | |
3578 | shared library is not yet mapped in. | |
3579 | Reading target memory is slow over serial lines, so we perform | |
3580 | this check only if the target has shared libraries. */ | |
3581 | if (target_read_memory (pc, buf, 4)) | |
3582 | return pc; | |
c906108c SS |
3583 | #endif |
3584 | ||
c5aa993b JM |
3585 | /* See if we can determine the end of the prologue via the symbol table. |
3586 | If so, then return either PC, or the PC after the prologue, whichever | |
3587 | is greater. */ | |
c906108c | 3588 | |
c5aa993b | 3589 | post_prologue_pc = after_prologue (pc); |
c906108c | 3590 | |
c5aa993b JM |
3591 | if (post_prologue_pc != 0) |
3592 | return max (pc, post_prologue_pc); | |
c906108c SS |
3593 | |
3594 | ||
c5aa993b JM |
3595 | /* Can't determine prologue from the symbol table, (this can happen if there |
3596 | is no debug information) so we need to fall back on the old code, which | |
3597 | looks at the instructions */ | |
c906108c SS |
3598 | /* FIXME (elz) !!!!: this may create a problem if, once the bp is hit, the user says |
3599 | where: the backtrace info is not right: this is because the point at which we | |
3600 | break is at the very first instruction of the function. At this time the stuff that | |
3601 | needs to be saved on the stack, has not been saved yet, so the backtrace | |
3602 | cannot know all it needs to know. This will need to be fixed in the | |
3603 | actual backtrace code. (Note: this is what DDE does) */ | |
3604 | ||
c5aa993b JM |
3605 | else |
3606 | return (skip_prologue_hard_way (pc)); | |
c906108c SS |
3607 | |
3608 | #if 0 | |
3609 | /* elz: I am keeping this code around just in case, but remember, all the | |
3610 | instructions are for alpha: you should change all to the hppa instructions */ | |
3611 | ||
c5aa993b JM |
3612 | /* Can't determine prologue from the symbol table, need to examine |
3613 | instructions. */ | |
c906108c | 3614 | |
c5aa993b JM |
3615 | /* Skip the typical prologue instructions. These are the stack adjustment |
3616 | instruction and the instructions that save registers on the stack | |
3617 | or in the gcc frame. */ | |
3618 | for (offset = 0; offset < 100; offset += 4) | |
3619 | { | |
3620 | int status; | |
c906108c | 3621 | |
c5aa993b JM |
3622 | status = read_memory_nobpt (pc + offset, buf, 4); |
3623 | if (status) | |
3624 | memory_error (status, pc + offset); | |
3625 | inst = extract_unsigned_integer (buf, 4); | |
c906108c | 3626 | |
c5aa993b JM |
3627 | /* The alpha has no delay slots. But let's keep the lenient stuff, |
3628 | we might need it for something else in the future. */ | |
3629 | if (lenient && 0) | |
3630 | continue; | |
c906108c | 3631 | |
c5aa993b JM |
3632 | if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */ |
3633 | continue; | |
3634 | if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */ | |
3635 | continue; | |
3636 | if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ | |
3637 | continue; | |
3638 | else if ((inst & 0xfc1f0000) == 0xb41e0000 | |
3639 | && (inst & 0xffff0000) != 0xb7fe0000) | |
3640 | continue; /* stq reg,n($sp) */ | |
3641 | /* reg != $zero */ | |
3642 | else if ((inst & 0xfc1f0000) == 0x9c1e0000 | |
3643 | && (inst & 0xffff0000) != 0x9ffe0000) | |
3644 | continue; /* stt reg,n($sp) */ | |
3645 | /* reg != $zero */ | |
3646 | else if (inst == 0x47de040f) /* bis sp,sp,fp */ | |
3647 | continue; | |
3648 | else | |
3649 | break; | |
3650 | } | |
3651 | return pc + offset; | |
c906108c SS |
3652 | #endif /* 0 */ |
3653 | } | |
3654 | ||
3655 | /* Put here the code to store, into a struct frame_saved_regs, | |
3656 | the addresses of the saved registers of frame described by FRAME_INFO. | |
3657 | This includes special registers such as pc and fp saved in special | |
3658 | ways in the stack frame. sp is even more special: | |
3659 | the address we return for it IS the sp for the next frame. */ | |
3660 | ||
3661 | void | |
3662 | hppa_frame_find_saved_regs (frame_info, frame_saved_regs) | |
3663 | struct frame_info *frame_info; | |
3664 | struct frame_saved_regs *frame_saved_regs; | |
3665 | { | |
3666 | CORE_ADDR pc; | |
3667 | struct unwind_table_entry *u; | |
3668 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; | |
3669 | int status, i, reg; | |
3670 | char buf[4]; | |
3671 | int fp_loc = -1; | |
3672 | ||
3673 | /* Zero out everything. */ | |
3674 | memset (frame_saved_regs, '\0', sizeof (struct frame_saved_regs)); | |
3675 | ||
3676 | /* Call dummy frames always look the same, so there's no need to | |
3677 | examine the dummy code to determine locations of saved registers; | |
3678 | instead, let find_dummy_frame_regs fill in the correct offsets | |
3679 | for the saved registers. */ | |
3680 | if ((frame_info->pc >= frame_info->frame | |
3681 | && frame_info->pc <= (frame_info->frame + CALL_DUMMY_LENGTH | |
c5aa993b JM |
3682 | + 32 * 4 + (NUM_REGS - FP0_REGNUM) * 8 |
3683 | + 6 * 4))) | |
c906108c SS |
3684 | find_dummy_frame_regs (frame_info, frame_saved_regs); |
3685 | ||
3686 | /* Interrupt handlers are special too. They lay out the register | |
3687 | state in the exact same order as the register numbers in GDB. */ | |
3688 | if (pc_in_interrupt_handler (frame_info->pc)) | |
3689 | { | |
3690 | for (i = 0; i < NUM_REGS; i++) | |
3691 | { | |
3692 | /* SP is a little special. */ | |
3693 | if (i == SP_REGNUM) | |
3694 | frame_saved_regs->regs[SP_REGNUM] | |
3695 | = read_memory_integer (frame_info->frame + SP_REGNUM * 4, 4); | |
3696 | else | |
3697 | frame_saved_regs->regs[i] = frame_info->frame + i * 4; | |
3698 | } | |
3699 | return; | |
3700 | } | |
3701 | ||
3702 | #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP | |
3703 | /* Handle signal handler callers. */ | |
3704 | if (frame_info->signal_handler_caller) | |
3705 | { | |
3706 | FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs); | |
3707 | return; | |
3708 | } | |
3709 | #endif | |
3710 | ||
3711 | /* Get the starting address of the function referred to by the PC | |
3712 | saved in frame. */ | |
3713 | pc = get_pc_function_start (frame_info->pc); | |
3714 | ||
3715 | /* Yow! */ | |
3716 | u = find_unwind_entry (pc); | |
3717 | if (!u) | |
3718 | return; | |
3719 | ||
3720 | /* This is how much of a frame adjustment we need to account for. */ | |
3721 | stack_remaining = u->Total_frame_size << 3; | |
3722 | ||
3723 | /* Magic register saves we want to know about. */ | |
3724 | save_rp = u->Save_RP; | |
3725 | save_sp = u->Save_SP; | |
3726 | ||
3727 | /* Turn the Entry_GR field into a bitmask. */ | |
3728 | save_gr = 0; | |
3729 | for (i = 3; i < u->Entry_GR + 3; i++) | |
3730 | { | |
3731 | /* Frame pointer gets saved into a special location. */ | |
3732 | if (u->Save_SP && i == FP_REGNUM) | |
3733 | continue; | |
3734 | ||
3735 | save_gr |= (1 << i); | |
3736 | } | |
3737 | ||
3738 | /* Turn the Entry_FR field into a bitmask too. */ | |
3739 | save_fr = 0; | |
3740 | for (i = 12; i < u->Entry_FR + 12; i++) | |
3741 | save_fr |= (1 << i); | |
3742 | ||
3743 | /* The frame always represents the value of %sp at entry to the | |
3744 | current function (and is thus equivalent to the "saved" stack | |
3745 | pointer. */ | |
3746 | frame_saved_regs->regs[SP_REGNUM] = frame_info->frame; | |
3747 | ||
3748 | /* Loop until we find everything of interest or hit a branch. | |
3749 | ||
3750 | For unoptimized GCC code and for any HP CC code this will never ever | |
3751 | examine any user instructions. | |
3752 | ||
3753 | For optimzied GCC code we're faced with problems. GCC will schedule | |
3754 | its prologue and make prologue instructions available for delay slot | |
3755 | filling. The end result is user code gets mixed in with the prologue | |
3756 | and a prologue instruction may be in the delay slot of the first branch | |
3757 | or call. | |
3758 | ||
3759 | Some unexpected things are expected with debugging optimized code, so | |
3760 | we allow this routine to walk past user instructions in optimized | |
3761 | GCC code. */ | |
3762 | while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) | |
3763 | { | |
3764 | status = target_read_memory (pc, buf, 4); | |
3765 | inst = extract_unsigned_integer (buf, 4); | |
3766 | ||
3767 | /* Yow! */ | |
3768 | if (status != 0) | |
3769 | return; | |
3770 | ||
3771 | /* Note the interesting effects of this instruction. */ | |
3772 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
3773 | ||
3774 | /* There is only one instruction used for saving RP into the stack. */ | |
3775 | if (inst == 0x6bc23fd9) | |
3776 | { | |
3777 | save_rp = 0; | |
3778 | frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 20; | |
3779 | } | |
3780 | ||
3781 | /* Just note that we found the save of SP into the stack. The | |
c5aa993b | 3782 | value for frame_saved_regs was computed above. */ |
c906108c SS |
3783 | if ((inst & 0xffffc000) == 0x6fc10000) |
3784 | save_sp = 0; | |
3785 | ||
3786 | /* Account for general and floating-point register saves. */ | |
3787 | reg = inst_saves_gr (inst); | |
3788 | if (reg >= 3 && reg <= 18 | |
3789 | && (!u->Save_SP || reg != FP_REGNUM)) | |
3790 | { | |
3791 | save_gr &= ~(1 << reg); | |
3792 | ||
3793 | /* stwm with a positive displacement is a *post modify*. */ | |
3794 | if ((inst >> 26) == 0x1b | |
3795 | && extract_14 (inst) >= 0) | |
3796 | frame_saved_regs->regs[reg] = frame_info->frame; | |
3797 | else | |
3798 | { | |
3799 | /* Handle code with and without frame pointers. */ | |
3800 | if (u->Save_SP) | |
3801 | frame_saved_regs->regs[reg] | |
3802 | = frame_info->frame + extract_14 (inst); | |
3803 | else | |
3804 | frame_saved_regs->regs[reg] | |
3805 | = frame_info->frame + (u->Total_frame_size << 3) | |
c5aa993b | 3806 | + extract_14 (inst); |
c906108c SS |
3807 | } |
3808 | } | |
3809 | ||
3810 | ||
3811 | /* GCC handles callee saved FP regs a little differently. | |
3812 | ||
c5aa993b JM |
3813 | It emits an instruction to put the value of the start of |
3814 | the FP store area into %r1. It then uses fstds,ma with | |
3815 | a basereg of %r1 for the stores. | |
c906108c | 3816 | |
c5aa993b JM |
3817 | HP CC emits them at the current stack pointer modifying |
3818 | the stack pointer as it stores each register. */ | |
c906108c SS |
3819 | |
3820 | /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */ | |
3821 | if ((inst & 0xffffc000) == 0x34610000 | |
3822 | || (inst & 0xffffc000) == 0x37c10000) | |
3823 | fp_loc = extract_14 (inst); | |
c5aa993b | 3824 | |
c906108c SS |
3825 | reg = inst_saves_fr (inst); |
3826 | if (reg >= 12 && reg <= 21) | |
3827 | { | |
3828 | /* Note +4 braindamage below is necessary because the FP status | |
3829 | registers are internally 8 registers rather than the expected | |
3830 | 4 registers. */ | |
3831 | save_fr &= ~(1 << reg); | |
3832 | if (fp_loc == -1) | |
3833 | { | |
3834 | /* 1st HP CC FP register store. After this instruction | |
c5aa993b JM |
3835 | we've set enough state that the GCC and HPCC code are |
3836 | both handled in the same manner. */ | |
c906108c SS |
3837 | frame_saved_regs->regs[reg + FP4_REGNUM + 4] = frame_info->frame; |
3838 | fp_loc = 8; | |
3839 | } | |
3840 | else | |
3841 | { | |
3842 | frame_saved_regs->regs[reg + FP0_REGNUM + 4] | |
3843 | = frame_info->frame + fp_loc; | |
3844 | fp_loc += 8; | |
3845 | } | |
3846 | } | |
3847 | ||
3848 | /* Quit if we hit any kind of branch. This can happen if a prologue | |
c5aa993b | 3849 | instruction is in the delay slot of the first call/branch. */ |
c906108c SS |
3850 | if (is_branch (inst)) |
3851 | break; | |
3852 | ||
3853 | /* Bump the PC. */ | |
3854 | pc += 4; | |
3855 | } | |
3856 | } | |
3857 | ||
3858 | ||
3859 | /* Exception handling support for the HP-UX ANSI C++ compiler. | |
3860 | The compiler (aCC) provides a callback for exception events; | |
3861 | GDB can set a breakpoint on this callback and find out what | |
3862 | exception event has occurred. */ | |
3863 | ||
3864 | /* The name of the hook to be set to point to the callback function */ | |
c5aa993b JM |
3865 | static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; |
3866 | /* The name of the function to be used to set the hook value */ | |
3867 | static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; | |
3868 | /* The name of the callback function in end.o */ | |
c906108c | 3869 | static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; |
c5aa993b JM |
3870 | /* Name of function in end.o on which a break is set (called by above) */ |
3871 | static char HP_ACC_EH_break[] = "__d_eh_break"; | |
3872 | /* Name of flag (in end.o) that enables catching throws */ | |
3873 | static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; | |
3874 | /* Name of flag (in end.o) that enables catching catching */ | |
3875 | static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; | |
3876 | /* The enum used by aCC */ | |
3877 | typedef enum | |
3878 | { | |
3879 | __EH_NOTIFY_THROW, | |
3880 | __EH_NOTIFY_CATCH | |
3881 | } | |
3882 | __eh_notification; | |
c906108c SS |
3883 | |
3884 | /* Is exception-handling support available with this executable? */ | |
3885 | static int hp_cxx_exception_support = 0; | |
3886 | /* Has the initialize function been run? */ | |
3887 | int hp_cxx_exception_support_initialized = 0; | |
3888 | /* Similar to above, but imported from breakpoint.c -- non-target-specific */ | |
3889 | extern int exception_support_initialized; | |
3890 | /* Address of __eh_notify_hook */ | |
a0b3c4fd | 3891 | static CORE_ADDR eh_notify_hook_addr = 0; |
c906108c | 3892 | /* Address of __d_eh_notify_callback */ |
a0b3c4fd | 3893 | static CORE_ADDR eh_notify_callback_addr = 0; |
c906108c | 3894 | /* Address of __d_eh_break */ |
a0b3c4fd | 3895 | static CORE_ADDR eh_break_addr = 0; |
c906108c | 3896 | /* Address of __d_eh_catch_catch */ |
a0b3c4fd | 3897 | static CORE_ADDR eh_catch_catch_addr = 0; |
c906108c | 3898 | /* Address of __d_eh_catch_throw */ |
a0b3c4fd | 3899 | static CORE_ADDR eh_catch_throw_addr = 0; |
c906108c | 3900 | /* Sal for __d_eh_break */ |
a0b3c4fd | 3901 | static struct symtab_and_line *break_callback_sal = 0; |
c906108c SS |
3902 | |
3903 | /* Code in end.c expects __d_pid to be set in the inferior, | |
3904 | otherwise __d_eh_notify_callback doesn't bother to call | |
3905 | __d_eh_break! So we poke the pid into this symbol | |
3906 | ourselves. | |
3907 | 0 => success | |
c5aa993b | 3908 | 1 => failure */ |
c906108c SS |
3909 | int |
3910 | setup_d_pid_in_inferior () | |
3911 | { | |
3912 | CORE_ADDR anaddr; | |
c5aa993b JM |
3913 | struct minimal_symbol *msymbol; |
3914 | char buf[4]; /* FIXME 32x64? */ | |
3915 | ||
c906108c SS |
3916 | /* Slam the pid of the process into __d_pid; failing is only a warning! */ |
3917 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
3918 | if (msymbol == NULL) | |
3919 | { | |
3920 | warning ("Unable to find __d_pid symbol in object file."); | |
3921 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
3922 | return 1; | |
3923 | } | |
3924 | ||
3925 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
c5aa993b JM |
3926 | store_unsigned_integer (buf, 4, inferior_pid); /* FIXME 32x64? */ |
3927 | if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ | |
c906108c SS |
3928 | { |
3929 | warning ("Unable to write __d_pid"); | |
3930 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
3931 | return 1; | |
3932 | } | |
3933 | return 0; | |
3934 | } | |
3935 | ||
3936 | /* Initialize exception catchpoint support by looking for the | |
3937 | necessary hooks/callbacks in end.o, etc., and set the hook value to | |
3938 | point to the required debug function | |
3939 | ||
3940 | Return 0 => failure | |
c5aa993b | 3941 | 1 => success */ |
c906108c SS |
3942 | |
3943 | static int | |
3944 | initialize_hp_cxx_exception_support () | |
3945 | { | |
3946 | struct symtabs_and_lines sals; | |
c5aa993b JM |
3947 | struct cleanup *old_chain; |
3948 | struct cleanup *canonical_strings_chain = NULL; | |
c906108c | 3949 | int i; |
c5aa993b JM |
3950 | char *addr_start; |
3951 | char *addr_end = NULL; | |
3952 | char **canonical = (char **) NULL; | |
c906108c | 3953 | int thread = -1; |
c5aa993b JM |
3954 | struct symbol *sym = NULL; |
3955 | struct minimal_symbol *msym = NULL; | |
3956 | struct objfile *objfile; | |
c906108c SS |
3957 | asection *shlib_info; |
3958 | ||
3959 | /* Detect and disallow recursion. On HP-UX with aCC, infinite | |
3960 | recursion is a possibility because finding the hook for exception | |
3961 | callbacks involves making a call in the inferior, which means | |
3962 | re-inserting breakpoints which can re-invoke this code */ | |
3963 | ||
c5aa993b JM |
3964 | static int recurse = 0; |
3965 | if (recurse > 0) | |
c906108c SS |
3966 | { |
3967 | hp_cxx_exception_support_initialized = 0; | |
3968 | exception_support_initialized = 0; | |
3969 | return 0; | |
3970 | } | |
3971 | ||
3972 | hp_cxx_exception_support = 0; | |
3973 | ||
3974 | /* First check if we have seen any HP compiled objects; if not, | |
3975 | it is very unlikely that HP's idiosyncratic callback mechanism | |
3976 | for exception handling debug support will be available! | |
3977 | This will percolate back up to breakpoint.c, where our callers | |
3978 | will decide to try the g++ exception-handling support instead. */ | |
3979 | if (!hp_som_som_object_present) | |
3980 | return 0; | |
c5aa993b | 3981 | |
c906108c SS |
3982 | /* We have a SOM executable with SOM debug info; find the hooks */ |
3983 | ||
3984 | /* First look for the notify hook provided by aCC runtime libs */ | |
3985 | /* If we find this symbol, we conclude that the executable must | |
3986 | have HP aCC exception support built in. If this symbol is not | |
3987 | found, even though we're a HP SOM-SOM file, we may have been | |
3988 | built with some other compiler (not aCC). This results percolates | |
3989 | back up to our callers in breakpoint.c which can decide to | |
3990 | try the g++ style of exception support instead. | |
3991 | If this symbol is found but the other symbols we require are | |
3992 | not found, there is something weird going on, and g++ support | |
3993 | should *not* be tried as an alternative. | |
c5aa993b | 3994 | |
c906108c SS |
3995 | ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. |
3996 | ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ | |
c5aa993b | 3997 | |
c906108c SS |
3998 | /* libCsup has this hook; it'll usually be non-debuggable */ |
3999 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); | |
4000 | if (msym) | |
4001 | { | |
4002 | eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4003 | hp_cxx_exception_support = 1; | |
c5aa993b | 4004 | } |
c906108c SS |
4005 | else |
4006 | { | |
4007 | warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook); | |
4008 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4009 | warning ("GDB will be unable to intercept exception events."); | |
4010 | eh_notify_hook_addr = 0; | |
4011 | hp_cxx_exception_support = 0; | |
4012 | return 0; | |
4013 | } | |
4014 | ||
c906108c | 4015 | /* Next look for the notify callback routine in end.o */ |
c5aa993b | 4016 | /* This is always available in the SOM symbol dictionary if end.o is linked in */ |
c906108c SS |
4017 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); |
4018 | if (msym) | |
4019 | { | |
4020 | eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4021 | hp_cxx_exception_support = 1; | |
c5aa993b JM |
4022 | } |
4023 | else | |
c906108c SS |
4024 | { |
4025 | warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback); | |
4026 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
4027 | warning ("GDB will be unable to intercept exception events."); | |
4028 | eh_notify_callback_addr = 0; | |
4029 | return 0; | |
4030 | } | |
4031 | ||
4032 | /* Check whether the executable is dynamically linked or archive bound */ | |
4033 | /* With an archive-bound executable we can use the raw addresses we find | |
4034 | for the callback function, etc. without modification. For an executable | |
4035 | with shared libraries, we have to do more work to find the plabel, which | |
4036 | can be the target of a call through $$dyncall from the aCC runtime support | |
4037 | library (libCsup) which is linked shared by default by aCC. */ | |
4038 | /* This test below was copied from somsolib.c/somread.c. It may not be a very | |
c5aa993b | 4039 | reliable one to test that an executable is linked shared. pai/1997-07-18 */ |
c906108c SS |
4040 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); |
4041 | if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) | |
4042 | { | |
4043 | /* The minsym we have has the local code address, but that's not the | |
4044 | plabel that can be used by an inter-load-module call. */ | |
4045 | /* Find solib handle for main image (which has end.o), and use that | |
4046 | and the min sym as arguments to __d_shl_get() (which does the equivalent | |
c5aa993b | 4047 | of shl_findsym()) to find the plabel. */ |
c906108c SS |
4048 | |
4049 | args_for_find_stub args; | |
4050 | static char message[] = "Error while finding exception callback hook:\n"; | |
c5aa993b | 4051 | |
c906108c SS |
4052 | args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr); |
4053 | args.msym = msym; | |
a0b3c4fd | 4054 | args.return_val = 0; |
c5aa993b | 4055 | |
c906108c | 4056 | recurse++; |
a0b3c4fd JM |
4057 | catch_errors (cover_find_stub_with_shl_get, (PTR) &args, message, |
4058 | RETURN_MASK_ALL); | |
4059 | eh_notify_callback_addr = args.return_val; | |
c906108c | 4060 | recurse--; |
c5aa993b | 4061 | |
c906108c | 4062 | exception_catchpoints_are_fragile = 1; |
c5aa993b | 4063 | |
c906108c | 4064 | if (!eh_notify_callback_addr) |
c5aa993b JM |
4065 | { |
4066 | /* We can get here either if there is no plabel in the export list | |
4067 | for the main image, or if something strange happened (??) */ | |
4068 | warning ("Couldn't find a plabel (indirect function label) for the exception callback."); | |
4069 | warning ("GDB will not be able to intercept exception events."); | |
4070 | return 0; | |
4071 | } | |
c906108c SS |
4072 | } |
4073 | else | |
4074 | exception_catchpoints_are_fragile = 0; | |
4075 | ||
c906108c | 4076 | /* Now, look for the breakpointable routine in end.o */ |
c5aa993b | 4077 | /* This should also be available in the SOM symbol dict. if end.o linked in */ |
c906108c SS |
4078 | msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); |
4079 | if (msym) | |
4080 | { | |
4081 | eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4082 | hp_cxx_exception_support = 1; | |
c5aa993b | 4083 | } |
c906108c SS |
4084 | else |
4085 | { | |
4086 | warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break); | |
4087 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4088 | warning ("GDB will be unable to intercept exception events."); | |
4089 | eh_break_addr = 0; | |
4090 | return 0; | |
4091 | } | |
4092 | ||
c906108c SS |
4093 | /* Next look for the catch enable flag provided in end.o */ |
4094 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
c5aa993b JM |
4095 | VAR_NAMESPACE, 0, (struct symtab **) NULL); |
4096 | if (sym) /* sometimes present in debug info */ | |
c906108c SS |
4097 | { |
4098 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); | |
4099 | hp_cxx_exception_support = 1; | |
4100 | } | |
c5aa993b JM |
4101 | else |
4102 | /* otherwise look in SOM symbol dict. */ | |
c906108c SS |
4103 | { |
4104 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); | |
4105 | if (msym) | |
c5aa993b JM |
4106 | { |
4107 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4108 | hp_cxx_exception_support = 1; | |
4109 | } | |
c906108c | 4110 | else |
c5aa993b JM |
4111 | { |
4112 | warning ("Unable to enable interception of exception catches."); | |
4113 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4114 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4115 | return 0; | |
4116 | } | |
c906108c SS |
4117 | } |
4118 | ||
c906108c SS |
4119 | /* Next look for the catch enable flag provided end.o */ |
4120 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
c5aa993b JM |
4121 | VAR_NAMESPACE, 0, (struct symtab **) NULL); |
4122 | if (sym) /* sometimes present in debug info */ | |
c906108c SS |
4123 | { |
4124 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); | |
4125 | hp_cxx_exception_support = 1; | |
4126 | } | |
c5aa993b JM |
4127 | else |
4128 | /* otherwise look in SOM symbol dict. */ | |
c906108c SS |
4129 | { |
4130 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); | |
4131 | if (msym) | |
c5aa993b JM |
4132 | { |
4133 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4134 | hp_cxx_exception_support = 1; | |
4135 | } | |
c906108c | 4136 | else |
c5aa993b JM |
4137 | { |
4138 | warning ("Unable to enable interception of exception throws."); | |
4139 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4140 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4141 | return 0; | |
4142 | } | |
c906108c SS |
4143 | } |
4144 | ||
c5aa993b JM |
4145 | /* Set the flags */ |
4146 | hp_cxx_exception_support = 2; /* everything worked so far */ | |
c906108c SS |
4147 | hp_cxx_exception_support_initialized = 1; |
4148 | exception_support_initialized = 1; | |
4149 | ||
4150 | return 1; | |
4151 | } | |
4152 | ||
4153 | /* Target operation for enabling or disabling interception of | |
4154 | exception events. | |
4155 | KIND is either EX_EVENT_THROW or EX_EVENT_CATCH | |
4156 | ENABLE is either 0 (disable) or 1 (enable). | |
4157 | Return value is NULL if no support found; | |
4158 | -1 if something went wrong, | |
4159 | or a pointer to a symtab/line struct if the breakpointable | |
c5aa993b | 4160 | address was found. */ |
c906108c | 4161 | |
c5aa993b | 4162 | struct symtab_and_line * |
c906108c | 4163 | child_enable_exception_callback (kind, enable) |
c5aa993b JM |
4164 | enum exception_event_kind kind; |
4165 | int enable; | |
c906108c SS |
4166 | { |
4167 | char buf[4]; | |
4168 | ||
4169 | if (!exception_support_initialized || !hp_cxx_exception_support_initialized) | |
4170 | if (!initialize_hp_cxx_exception_support ()) | |
4171 | return NULL; | |
4172 | ||
4173 | switch (hp_cxx_exception_support) | |
4174 | { | |
c5aa993b JM |
4175 | case 0: |
4176 | /* Assuming no HP support at all */ | |
4177 | return NULL; | |
4178 | case 1: | |
4179 | /* HP support should be present, but something went wrong */ | |
4180 | return (struct symtab_and_line *) -1; /* yuck! */ | |
4181 | /* there may be other cases in the future */ | |
c906108c | 4182 | } |
c5aa993b | 4183 | |
c906108c | 4184 | /* Set the EH hook to point to the callback routine */ |
c5aa993b | 4185 | store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ |
c906108c | 4186 | /* pai: (temp) FIXME should there be a pack operation first? */ |
c5aa993b | 4187 | if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ |
c906108c SS |
4188 | { |
4189 | warning ("Could not write to target memory for exception event callback."); | |
4190 | warning ("Interception of exception events may not work."); | |
c5aa993b | 4191 | return (struct symtab_and_line *) -1; |
c906108c SS |
4192 | } |
4193 | if (enable) | |
4194 | { | |
c5aa993b | 4195 | /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */ |
c906108c | 4196 | if (inferior_pid > 0) |
c5aa993b JM |
4197 | { |
4198 | if (setup_d_pid_in_inferior ()) | |
4199 | return (struct symtab_and_line *) -1; | |
4200 | } | |
c906108c | 4201 | else |
c5aa993b JM |
4202 | { |
4203 | warning ("Internal error: Invalid inferior pid? Cannot intercept exception events."); /* purecov: deadcode */ | |
4204 | return (struct symtab_and_line *) -1; /* purecov: deadcode */ | |
4205 | } | |
c906108c | 4206 | } |
c5aa993b | 4207 | |
c906108c SS |
4208 | switch (kind) |
4209 | { | |
c5aa993b JM |
4210 | case EX_EVENT_THROW: |
4211 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
4212 | if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ | |
4213 | { | |
4214 | warning ("Couldn't enable exception throw interception."); | |
4215 | return (struct symtab_and_line *) -1; | |
4216 | } | |
4217 | break; | |
4218 | case EX_EVENT_CATCH: | |
4219 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
4220 | if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ | |
4221 | { | |
4222 | warning ("Couldn't enable exception catch interception."); | |
4223 | return (struct symtab_and_line *) -1; | |
4224 | } | |
4225 | break; | |
4226 | default: /* purecov: deadcode */ | |
4227 | error ("Request to enable unknown or unsupported exception event."); /* purecov: deadcode */ | |
c906108c | 4228 | } |
c5aa993b | 4229 | |
c906108c SS |
4230 | /* Copy break address into new sal struct, malloc'ing if needed. */ |
4231 | if (!break_callback_sal) | |
4232 | { | |
4233 | break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); | |
4234 | } | |
c5aa993b | 4235 | INIT_SAL (break_callback_sal); |
c906108c SS |
4236 | break_callback_sal->symtab = NULL; |
4237 | break_callback_sal->pc = eh_break_addr; | |
4238 | break_callback_sal->line = 0; | |
4239 | break_callback_sal->end = eh_break_addr; | |
c5aa993b | 4240 | |
c906108c SS |
4241 | return break_callback_sal; |
4242 | } | |
4243 | ||
c5aa993b | 4244 | /* Record some information about the current exception event */ |
c906108c | 4245 | static struct exception_event_record current_ex_event; |
c5aa993b JM |
4246 | /* Convenience struct */ |
4247 | static struct symtab_and_line null_symtab_and_line = | |
4248 | {NULL, 0, 0, 0}; | |
c906108c SS |
4249 | |
4250 | /* Report current exception event. Returns a pointer to a record | |
4251 | that describes the kind of the event, where it was thrown from, | |
4252 | and where it will be caught. More information may be reported | |
c5aa993b | 4253 | in the future */ |
c906108c SS |
4254 | struct exception_event_record * |
4255 | child_get_current_exception_event () | |
4256 | { | |
c5aa993b JM |
4257 | CORE_ADDR event_kind; |
4258 | CORE_ADDR throw_addr; | |
4259 | CORE_ADDR catch_addr; | |
c906108c SS |
4260 | struct frame_info *fi, *curr_frame; |
4261 | int level = 1; | |
4262 | ||
c5aa993b | 4263 | curr_frame = get_current_frame (); |
c906108c SS |
4264 | if (!curr_frame) |
4265 | return (struct exception_event_record *) NULL; | |
4266 | ||
4267 | /* Go up one frame to __d_eh_notify_callback, because at the | |
4268 | point when this code is executed, there's garbage in the | |
4269 | arguments of __d_eh_break. */ | |
4270 | fi = find_relative_frame (curr_frame, &level); | |
4271 | if (level != 0) | |
4272 | return (struct exception_event_record *) NULL; | |
4273 | ||
4274 | select_frame (fi, -1); | |
4275 | ||
4276 | /* Read in the arguments */ | |
4277 | /* __d_eh_notify_callback() is called with 3 arguments: | |
c5aa993b JM |
4278 | 1. event kind catch or throw |
4279 | 2. the target address if known | |
4280 | 3. a flag -- not sure what this is. pai/1997-07-17 */ | |
4281 | event_kind = read_register (ARG0_REGNUM); | |
c906108c SS |
4282 | catch_addr = read_register (ARG1_REGNUM); |
4283 | ||
4284 | /* Now go down to a user frame */ | |
4285 | /* For a throw, __d_eh_break is called by | |
c5aa993b JM |
4286 | __d_eh_notify_callback which is called by |
4287 | __notify_throw which is called | |
4288 | from user code. | |
c906108c | 4289 | For a catch, __d_eh_break is called by |
c5aa993b JM |
4290 | __d_eh_notify_callback which is called by |
4291 | <stackwalking stuff> which is called by | |
4292 | __throw__<stuff> or __rethrow_<stuff> which is called | |
4293 | from user code. */ | |
4294 | /* FIXME: Don't use such magic numbers; search for the frames */ | |
c906108c SS |
4295 | level = (event_kind == EX_EVENT_THROW) ? 3 : 4; |
4296 | fi = find_relative_frame (curr_frame, &level); | |
4297 | if (level != 0) | |
4298 | return (struct exception_event_record *) NULL; | |
4299 | ||
4300 | select_frame (fi, -1); | |
4301 | throw_addr = fi->pc; | |
4302 | ||
4303 | /* Go back to original (top) frame */ | |
4304 | select_frame (curr_frame, -1); | |
4305 | ||
4306 | current_ex_event.kind = (enum exception_event_kind) event_kind; | |
4307 | current_ex_event.throw_sal = find_pc_line (throw_addr, 1); | |
4308 | current_ex_event.catch_sal = find_pc_line (catch_addr, 1); | |
4309 | ||
4310 | return ¤t_ex_event; | |
4311 | } | |
4312 | ||
c906108c SS |
4313 | static void |
4314 | unwind_command (exp, from_tty) | |
4315 | char *exp; | |
4316 | int from_tty; | |
4317 | { | |
4318 | CORE_ADDR address; | |
4319 | struct unwind_table_entry *u; | |
4320 | ||
4321 | /* If we have an expression, evaluate it and use it as the address. */ | |
4322 | ||
4323 | if (exp != 0 && *exp != 0) | |
4324 | address = parse_and_eval_address (exp); | |
4325 | else | |
4326 | return; | |
4327 | ||
4328 | u = find_unwind_entry (address); | |
4329 | ||
4330 | if (!u) | |
4331 | { | |
4332 | printf_unfiltered ("Can't find unwind table entry for %s\n", exp); | |
4333 | return; | |
4334 | } | |
4335 | ||
4336 | printf_unfiltered ("unwind_table_entry (0x%x):\n", u); | |
4337 | ||
4338 | printf_unfiltered ("\tregion_start = "); | |
4339 | print_address (u->region_start, gdb_stdout); | |
4340 | ||
4341 | printf_unfiltered ("\n\tregion_end = "); | |
4342 | print_address (u->region_end, gdb_stdout); | |
4343 | ||
4344 | #ifdef __STDC__ | |
4345 | #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD); | |
4346 | #else | |
4347 | #define pif(FLD) if (u->FLD) printf_unfiltered (" FLD"); | |
4348 | #endif | |
4349 | ||
4350 | printf_unfiltered ("\n\tflags ="); | |
4351 | pif (Cannot_unwind); | |
4352 | pif (Millicode); | |
4353 | pif (Millicode_save_sr0); | |
4354 | pif (Entry_SR); | |
4355 | pif (Args_stored); | |
4356 | pif (Variable_Frame); | |
4357 | pif (Separate_Package_Body); | |
4358 | pif (Frame_Extension_Millicode); | |
4359 | pif (Stack_Overflow_Check); | |
4360 | pif (Two_Instruction_SP_Increment); | |
4361 | pif (Ada_Region); | |
4362 | pif (Save_SP); | |
4363 | pif (Save_RP); | |
4364 | pif (Save_MRP_in_frame); | |
4365 | pif (extn_ptr_defined); | |
4366 | pif (Cleanup_defined); | |
4367 | pif (MPE_XL_interrupt_marker); | |
4368 | pif (HP_UX_interrupt_marker); | |
4369 | pif (Large_frame); | |
4370 | ||
4371 | putchar_unfiltered ('\n'); | |
4372 | ||
4373 | #ifdef __STDC__ | |
4374 | #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD); | |
4375 | #else | |
4376 | #define pin(FLD) printf_unfiltered ("\tFLD = 0x%x\n", u->FLD); | |
4377 | #endif | |
4378 | ||
4379 | pin (Region_description); | |
4380 | pin (Entry_FR); | |
4381 | pin (Entry_GR); | |
4382 | pin (Total_frame_size); | |
4383 | } | |
c906108c SS |
4384 | |
4385 | #ifdef PREPARE_TO_PROCEED | |
4386 | ||
4387 | /* If the user has switched threads, and there is a breakpoint | |
4388 | at the old thread's pc location, then switch to that thread | |
4389 | and return TRUE, else return FALSE and don't do a thread | |
4390 | switch (or rather, don't seem to have done a thread switch). | |
4391 | ||
4392 | Ptrace-based gdb will always return FALSE to the thread-switch | |
4393 | query, and thus also to PREPARE_TO_PROCEED. | |
4394 | ||
4395 | The important thing is whether there is a BPT instruction, | |
4396 | not how many user breakpoints there are. So we have to worry | |
4397 | about things like these: | |
4398 | ||
4399 | o Non-bp stop -- NO | |
4400 | ||
4401 | o User hits bp, no switch -- NO | |
4402 | ||
4403 | o User hits bp, switches threads -- YES | |
4404 | ||
4405 | o User hits bp, deletes bp, switches threads -- NO | |
4406 | ||
4407 | o User hits bp, deletes one of two or more bps | |
c5aa993b | 4408 | at that PC, user switches threads -- YES |
c906108c SS |
4409 | |
4410 | o Plus, since we're buffering events, the user may have hit a | |
c5aa993b JM |
4411 | breakpoint, deleted the breakpoint and then gotten another |
4412 | hit on that same breakpoint on another thread which | |
4413 | actually hit before the delete. (FIXME in breakpoint.c | |
4414 | so that "dead" breakpoints are ignored?) -- NO | |
c906108c SS |
4415 | |
4416 | For these reasons, we have to violate information hiding and | |
4417 | call "breakpoint_here_p". If core gdb thinks there is a bpt | |
4418 | here, that's what counts, as core gdb is the one which is | |
4419 | putting the BPT instruction in and taking it out. */ | |
4420 | int | |
c5aa993b | 4421 | hppa_prepare_to_proceed () |
c906108c SS |
4422 | { |
4423 | pid_t old_thread; | |
4424 | pid_t current_thread; | |
4425 | ||
c5aa993b | 4426 | old_thread = hppa_switched_threads (inferior_pid); |
c906108c SS |
4427 | if (old_thread != 0) |
4428 | { | |
4429 | /* Switched over from "old_thread". Try to do | |
4430 | as little work as possible, 'cause mostly | |
4431 | we're going to switch back. */ | |
4432 | CORE_ADDR new_pc; | |
c5aa993b | 4433 | CORE_ADDR old_pc = read_pc (); |
c906108c SS |
4434 | |
4435 | /* Yuk, shouldn't use global to specify current | |
4436 | thread. But that's how gdb does it. */ | |
4437 | current_thread = inferior_pid; | |
c5aa993b | 4438 | inferior_pid = old_thread; |
c906108c | 4439 | |
c5aa993b JM |
4440 | new_pc = read_pc (); |
4441 | if (new_pc != old_pc /* If at same pc, no need */ | |
c906108c | 4442 | && breakpoint_here_p (new_pc)) |
c5aa993b | 4443 | { |
c906108c | 4444 | /* User hasn't deleted the BP. |
c5aa993b | 4445 | Return TRUE, finishing switch to "old_thread". */ |
c906108c SS |
4446 | flush_cached_frames (); |
4447 | registers_changed (); | |
4448 | #if 0 | |
c5aa993b | 4449 | printf ("---> PREPARE_TO_PROCEED (was %d, now %d)!\n", |
c906108c SS |
4450 | current_thread, inferior_pid); |
4451 | #endif | |
c5aa993b | 4452 | |
c906108c | 4453 | return 1; |
c5aa993b | 4454 | } |
c906108c SS |
4455 | |
4456 | /* Otherwise switch back to the user-chosen thread. */ | |
4457 | inferior_pid = current_thread; | |
c5aa993b | 4458 | new_pc = read_pc (); /* Re-prime register cache */ |
c906108c SS |
4459 | } |
4460 | ||
4461 | return 0; | |
4462 | } | |
4463 | #endif /* PREPARE_TO_PROCEED */ | |
4464 | ||
4465 | void | |
4466 | _initialize_hppa_tdep () | |
4467 | { | |
4468 | tm_print_insn = print_insn_hppa; | |
4469 | ||
c906108c SS |
4470 | add_cmd ("unwind", class_maintenance, unwind_command, |
4471 | "Print unwind table entry at given address.", | |
4472 | &maintenanceprintlist); | |
c906108c | 4473 | } |