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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)); | |
53a5351d | 132 | static void record_text_segment_lowaddr PARAMS ((bfd *, asection *, void *)); |
c906108c | 133 | |
c5aa993b JM |
134 | typedef struct |
135 | { | |
136 | struct minimal_symbol *msym; | |
137 | CORE_ADDR solib_handle; | |
a0b3c4fd | 138 | CORE_ADDR return_val; |
c5aa993b JM |
139 | } |
140 | args_for_find_stub; | |
c906108c | 141 | |
a0b3c4fd | 142 | static int cover_find_stub_with_shl_get (PTR); |
c906108c | 143 | |
c5aa993b | 144 | static int is_pa_2 = 0; /* False */ |
c906108c | 145 | |
c5aa993b | 146 | /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */ |
c906108c SS |
147 | extern int hp_som_som_object_present; |
148 | ||
149 | /* In breakpoint.c */ | |
150 | extern int exception_catchpoints_are_fragile; | |
151 | ||
152 | /* This is defined in valops.c. */ | |
153 | extern value_ptr | |
c5aa993b | 154 | find_function_in_inferior PARAMS ((char *)); |
c906108c SS |
155 | |
156 | /* Should call_function allocate stack space for a struct return? */ | |
157 | int | |
158 | hppa_use_struct_convention (gcc_p, type) | |
159 | int gcc_p; | |
160 | struct type *type; | |
161 | { | |
162 | return (TYPE_LENGTH (type) > 8); | |
163 | } | |
c906108c | 164 | \f |
c5aa993b | 165 | |
c906108c SS |
166 | /* Routines to extract various sized constants out of hppa |
167 | instructions. */ | |
168 | ||
169 | /* This assumes that no garbage lies outside of the lower bits of | |
170 | value. */ | |
171 | ||
172 | static int | |
173 | sign_extend (val, bits) | |
174 | unsigned val, bits; | |
175 | { | |
c5aa993b | 176 | return (int) (val >> (bits - 1) ? (-1 << bits) | val : val); |
c906108c SS |
177 | } |
178 | ||
179 | /* For many immediate values the sign bit is the low bit! */ | |
180 | ||
181 | static int | |
182 | low_sign_extend (val, bits) | |
183 | unsigned val, bits; | |
184 | { | |
c5aa993b | 185 | return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1); |
c906108c SS |
186 | } |
187 | ||
188 | /* extract the immediate field from a ld{bhw}s instruction */ | |
189 | ||
c906108c SS |
190 | static int |
191 | extract_5_load (word) | |
192 | unsigned word; | |
193 | { | |
194 | return low_sign_extend (word >> 16 & MASK_5, 5); | |
195 | } | |
196 | ||
c906108c SS |
197 | /* extract the immediate field from a break instruction */ |
198 | ||
199 | static unsigned | |
200 | extract_5r_store (word) | |
201 | unsigned word; | |
202 | { | |
203 | return (word & MASK_5); | |
204 | } | |
205 | ||
206 | /* extract the immediate field from a {sr}sm instruction */ | |
207 | ||
208 | static unsigned | |
209 | extract_5R_store (word) | |
210 | unsigned word; | |
211 | { | |
212 | return (word >> 16 & MASK_5); | |
213 | } | |
214 | ||
c906108c SS |
215 | /* extract a 14 bit immediate field */ |
216 | ||
217 | static int | |
218 | extract_14 (word) | |
219 | unsigned word; | |
220 | { | |
221 | return low_sign_extend (word & MASK_14, 14); | |
222 | } | |
223 | ||
224 | /* deposit a 14 bit constant in a word */ | |
225 | ||
226 | static unsigned | |
227 | deposit_14 (opnd, word) | |
228 | int opnd; | |
229 | unsigned word; | |
230 | { | |
231 | unsigned sign = (opnd < 0 ? 1 : 0); | |
232 | ||
c5aa993b | 233 | return word | ((unsigned) opnd << 1 & MASK_14) | sign; |
c906108c SS |
234 | } |
235 | ||
236 | /* extract a 21 bit constant */ | |
237 | ||
238 | static int | |
239 | extract_21 (word) | |
240 | unsigned word; | |
241 | { | |
242 | int val; | |
243 | ||
244 | word &= MASK_21; | |
245 | word <<= 11; | |
246 | val = GET_FIELD (word, 20, 20); | |
247 | val <<= 11; | |
248 | val |= GET_FIELD (word, 9, 19); | |
249 | val <<= 2; | |
250 | val |= GET_FIELD (word, 5, 6); | |
251 | val <<= 5; | |
252 | val |= GET_FIELD (word, 0, 4); | |
253 | val <<= 2; | |
254 | val |= GET_FIELD (word, 7, 8); | |
255 | return sign_extend (val, 21) << 11; | |
256 | } | |
257 | ||
258 | /* deposit a 21 bit constant in a word. Although 21 bit constants are | |
259 | usually the top 21 bits of a 32 bit constant, we assume that only | |
260 | the low 21 bits of opnd are relevant */ | |
261 | ||
262 | static unsigned | |
263 | deposit_21 (opnd, word) | |
264 | unsigned opnd, word; | |
265 | { | |
266 | unsigned val = 0; | |
267 | ||
268 | val |= GET_FIELD (opnd, 11 + 14, 11 + 18); | |
269 | val <<= 2; | |
270 | val |= GET_FIELD (opnd, 11 + 12, 11 + 13); | |
271 | val <<= 2; | |
272 | val |= GET_FIELD (opnd, 11 + 19, 11 + 20); | |
273 | val <<= 11; | |
274 | val |= GET_FIELD (opnd, 11 + 1, 11 + 11); | |
275 | val <<= 1; | |
276 | val |= GET_FIELD (opnd, 11 + 0, 11 + 0); | |
277 | return word | val; | |
278 | } | |
279 | ||
c906108c SS |
280 | /* extract a 17 bit constant from branch instructions, returning the |
281 | 19 bit signed value. */ | |
282 | ||
283 | static int | |
284 | extract_17 (word) | |
285 | unsigned word; | |
286 | { | |
287 | return sign_extend (GET_FIELD (word, 19, 28) | | |
288 | GET_FIELD (word, 29, 29) << 10 | | |
289 | GET_FIELD (word, 11, 15) << 11 | | |
290 | (word & 0x1) << 16, 17) << 2; | |
291 | } | |
292 | \f | |
293 | ||
294 | /* Compare the start address for two unwind entries returning 1 if | |
295 | the first address is larger than the second, -1 if the second is | |
296 | larger than the first, and zero if they are equal. */ | |
297 | ||
298 | static int | |
299 | compare_unwind_entries (arg1, arg2) | |
300 | const void *arg1; | |
301 | const void *arg2; | |
302 | { | |
303 | const struct unwind_table_entry *a = arg1; | |
304 | const struct unwind_table_entry *b = arg2; | |
305 | ||
306 | if (a->region_start > b->region_start) | |
307 | return 1; | |
308 | else if (a->region_start < b->region_start) | |
309 | return -1; | |
310 | else | |
311 | return 0; | |
312 | } | |
313 | ||
53a5351d JM |
314 | static CORE_ADDR low_text_segment_address; |
315 | ||
316 | static void | |
317 | record_text_segment_lowaddr (abfd, section, ignored) | |
318 | bfd *abfd ATTRIBUTE_UNUSED; | |
319 | asection *section; | |
320 | PTR ignored ATTRIBUTE_UNUSED; | |
321 | { | |
322 | if ((section->flags & (SEC_ALLOC | SEC_LOAD | SEC_READONLY) | |
323 | == (SEC_ALLOC | SEC_LOAD | SEC_READONLY)) | |
324 | && section->vma < low_text_segment_address) | |
325 | low_text_segment_address = section->vma; | |
326 | } | |
327 | ||
c906108c SS |
328 | static void |
329 | internalize_unwinds (objfile, table, section, entries, size, text_offset) | |
330 | struct objfile *objfile; | |
331 | struct unwind_table_entry *table; | |
332 | asection *section; | |
333 | unsigned int entries, size; | |
334 | CORE_ADDR text_offset; | |
335 | { | |
336 | /* We will read the unwind entries into temporary memory, then | |
337 | fill in the actual unwind table. */ | |
338 | if (size > 0) | |
339 | { | |
340 | unsigned long tmp; | |
341 | unsigned i; | |
342 | char *buf = alloca (size); | |
343 | ||
53a5351d JM |
344 | low_text_segment_address = -1; |
345 | ||
346 | /* If addresses are 64 bits wide, then unwinds are supposed to | |
347 | be segment relative offsets instead of absolute addresses. */ | |
348 | if (TARGET_PTR_BIT == 64) | |
349 | { | |
350 | bfd_map_over_sections (objfile->obfd, | |
351 | record_text_segment_lowaddr, (PTR) NULL); | |
352 | ||
353 | /* ?!? Mask off some low bits. Should this instead subtract | |
354 | out the lowest section's filepos or something like that? | |
355 | This looks very hokey to me. */ | |
356 | low_text_segment_address &= ~0xfff; | |
357 | text_offset += low_text_segment_address; | |
358 | } | |
359 | ||
c906108c SS |
360 | bfd_get_section_contents (objfile->obfd, section, buf, 0, size); |
361 | ||
362 | /* Now internalize the information being careful to handle host/target | |
c5aa993b | 363 | endian issues. */ |
c906108c SS |
364 | for (i = 0; i < entries; i++) |
365 | { | |
366 | table[i].region_start = bfd_get_32 (objfile->obfd, | |
c5aa993b | 367 | (bfd_byte *) buf); |
c906108c SS |
368 | table[i].region_start += text_offset; |
369 | buf += 4; | |
c5aa993b | 370 | table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
371 | table[i].region_end += text_offset; |
372 | buf += 4; | |
c5aa993b | 373 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
374 | buf += 4; |
375 | table[i].Cannot_unwind = (tmp >> 31) & 0x1; | |
376 | table[i].Millicode = (tmp >> 30) & 0x1; | |
377 | table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1; | |
378 | table[i].Region_description = (tmp >> 27) & 0x3; | |
379 | table[i].reserved1 = (tmp >> 26) & 0x1; | |
380 | table[i].Entry_SR = (tmp >> 25) & 0x1; | |
381 | table[i].Entry_FR = (tmp >> 21) & 0xf; | |
382 | table[i].Entry_GR = (tmp >> 16) & 0x1f; | |
383 | table[i].Args_stored = (tmp >> 15) & 0x1; | |
384 | table[i].Variable_Frame = (tmp >> 14) & 0x1; | |
385 | table[i].Separate_Package_Body = (tmp >> 13) & 0x1; | |
386 | table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1; | |
387 | table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1; | |
388 | table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1; | |
389 | table[i].Ada_Region = (tmp >> 9) & 0x1; | |
390 | table[i].cxx_info = (tmp >> 8) & 0x1; | |
391 | table[i].cxx_try_catch = (tmp >> 7) & 0x1; | |
392 | table[i].sched_entry_seq = (tmp >> 6) & 0x1; | |
393 | table[i].reserved2 = (tmp >> 5) & 0x1; | |
394 | table[i].Save_SP = (tmp >> 4) & 0x1; | |
395 | table[i].Save_RP = (tmp >> 3) & 0x1; | |
396 | table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1; | |
397 | table[i].extn_ptr_defined = (tmp >> 1) & 0x1; | |
398 | table[i].Cleanup_defined = tmp & 0x1; | |
c5aa993b | 399 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
400 | buf += 4; |
401 | table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1; | |
402 | table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1; | |
403 | table[i].Large_frame = (tmp >> 29) & 0x1; | |
404 | table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1; | |
405 | table[i].reserved4 = (tmp >> 27) & 0x1; | |
406 | table[i].Total_frame_size = tmp & 0x7ffffff; | |
407 | ||
c5aa993b | 408 | /* Stub unwinds are handled elsewhere. */ |
c906108c SS |
409 | table[i].stub_unwind.stub_type = 0; |
410 | table[i].stub_unwind.padding = 0; | |
411 | } | |
412 | } | |
413 | } | |
414 | ||
415 | /* Read in the backtrace information stored in the `$UNWIND_START$' section of | |
416 | the object file. This info is used mainly by find_unwind_entry() to find | |
417 | out the stack frame size and frame pointer used by procedures. We put | |
418 | everything on the psymbol obstack in the objfile so that it automatically | |
419 | gets freed when the objfile is destroyed. */ | |
420 | ||
421 | static void | |
422 | read_unwind_info (objfile) | |
423 | struct objfile *objfile; | |
424 | { | |
425 | asection *unwind_sec, *elf_unwind_sec, *stub_unwind_sec; | |
426 | unsigned unwind_size, elf_unwind_size, stub_unwind_size, total_size; | |
427 | unsigned index, unwind_entries, elf_unwind_entries; | |
428 | unsigned stub_entries, total_entries; | |
429 | CORE_ADDR text_offset; | |
430 | struct obj_unwind_info *ui; | |
431 | obj_private_data_t *obj_private; | |
432 | ||
433 | text_offset = ANOFFSET (objfile->section_offsets, 0); | |
c5aa993b JM |
434 | ui = (struct obj_unwind_info *) obstack_alloc (&objfile->psymbol_obstack, |
435 | sizeof (struct obj_unwind_info)); | |
c906108c SS |
436 | |
437 | ui->table = NULL; | |
438 | ui->cache = NULL; | |
439 | ui->last = -1; | |
440 | ||
441 | /* Get hooks to all unwind sections. Note there is no linker-stub unwind | |
442 | section in ELF at the moment. */ | |
443 | unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_START$"); | |
444 | elf_unwind_sec = bfd_get_section_by_name (objfile->obfd, ".PARISC.unwind"); | |
445 | stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$"); | |
446 | ||
447 | /* Get sizes and unwind counts for all sections. */ | |
448 | if (unwind_sec) | |
449 | { | |
450 | unwind_size = bfd_section_size (objfile->obfd, unwind_sec); | |
451 | unwind_entries = unwind_size / UNWIND_ENTRY_SIZE; | |
452 | } | |
453 | else | |
454 | { | |
455 | unwind_size = 0; | |
456 | unwind_entries = 0; | |
457 | } | |
458 | ||
459 | if (elf_unwind_sec) | |
460 | { | |
c5aa993b JM |
461 | elf_unwind_size = bfd_section_size (objfile->obfd, elf_unwind_sec); /* purecov: deadcode */ |
462 | elf_unwind_entries = elf_unwind_size / UNWIND_ENTRY_SIZE; /* purecov: deadcode */ | |
c906108c SS |
463 | } |
464 | else | |
465 | { | |
466 | elf_unwind_size = 0; | |
467 | elf_unwind_entries = 0; | |
468 | } | |
469 | ||
470 | if (stub_unwind_sec) | |
471 | { | |
472 | stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec); | |
473 | stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE; | |
474 | } | |
475 | else | |
476 | { | |
477 | stub_unwind_size = 0; | |
478 | stub_entries = 0; | |
479 | } | |
480 | ||
481 | /* Compute total number of unwind entries and their total size. */ | |
482 | total_entries = unwind_entries + elf_unwind_entries + stub_entries; | |
483 | total_size = total_entries * sizeof (struct unwind_table_entry); | |
484 | ||
485 | /* Allocate memory for the unwind table. */ | |
486 | ui->table = (struct unwind_table_entry *) | |
487 | obstack_alloc (&objfile->psymbol_obstack, total_size); | |
c5aa993b | 488 | ui->last = total_entries - 1; |
c906108c SS |
489 | |
490 | /* Internalize the standard unwind entries. */ | |
491 | index = 0; | |
492 | internalize_unwinds (objfile, &ui->table[index], unwind_sec, | |
493 | unwind_entries, unwind_size, text_offset); | |
494 | index += unwind_entries; | |
495 | internalize_unwinds (objfile, &ui->table[index], elf_unwind_sec, | |
496 | elf_unwind_entries, elf_unwind_size, text_offset); | |
497 | index += elf_unwind_entries; | |
498 | ||
499 | /* Now internalize the stub unwind entries. */ | |
500 | if (stub_unwind_size > 0) | |
501 | { | |
502 | unsigned int i; | |
503 | char *buf = alloca (stub_unwind_size); | |
504 | ||
505 | /* Read in the stub unwind entries. */ | |
506 | bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf, | |
507 | 0, stub_unwind_size); | |
508 | ||
509 | /* Now convert them into regular unwind entries. */ | |
510 | for (i = 0; i < stub_entries; i++, index++) | |
511 | { | |
512 | /* Clear out the next unwind entry. */ | |
513 | memset (&ui->table[index], 0, sizeof (struct unwind_table_entry)); | |
514 | ||
515 | /* Convert offset & size into region_start and region_end. | |
516 | Stuff away the stub type into "reserved" fields. */ | |
517 | ui->table[index].region_start = bfd_get_32 (objfile->obfd, | |
518 | (bfd_byte *) buf); | |
519 | ui->table[index].region_start += text_offset; | |
520 | buf += 4; | |
521 | ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd, | |
c5aa993b | 522 | (bfd_byte *) buf); |
c906108c SS |
523 | buf += 2; |
524 | ui->table[index].region_end | |
c5aa993b JM |
525 | = ui->table[index].region_start + 4 * |
526 | (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1); | |
c906108c SS |
527 | buf += 2; |
528 | } | |
529 | ||
530 | } | |
531 | ||
532 | /* Unwind table needs to be kept sorted. */ | |
533 | qsort (ui->table, total_entries, sizeof (struct unwind_table_entry), | |
534 | compare_unwind_entries); | |
535 | ||
536 | /* Keep a pointer to the unwind information. */ | |
c5aa993b | 537 | if (objfile->obj_private == NULL) |
c906108c SS |
538 | { |
539 | obj_private = (obj_private_data_t *) | |
c5aa993b JM |
540 | obstack_alloc (&objfile->psymbol_obstack, |
541 | sizeof (obj_private_data_t)); | |
c906108c | 542 | obj_private->unwind_info = NULL; |
c5aa993b | 543 | obj_private->so_info = NULL; |
53a5351d | 544 | obj_private->dp = 0; |
c5aa993b | 545 | |
c906108c SS |
546 | objfile->obj_private = (PTR) obj_private; |
547 | } | |
c5aa993b | 548 | obj_private = (obj_private_data_t *) objfile->obj_private; |
c906108c SS |
549 | obj_private->unwind_info = ui; |
550 | } | |
551 | ||
552 | /* Lookup the unwind (stack backtrace) info for the given PC. We search all | |
553 | of the objfiles seeking the unwind table entry for this PC. Each objfile | |
554 | contains a sorted list of struct unwind_table_entry. Since we do a binary | |
555 | search of the unwind tables, we depend upon them to be sorted. */ | |
556 | ||
557 | struct unwind_table_entry * | |
c5aa993b | 558 | find_unwind_entry (pc) |
c906108c SS |
559 | CORE_ADDR pc; |
560 | { | |
561 | int first, middle, last; | |
562 | struct objfile *objfile; | |
563 | ||
564 | /* A function at address 0? Not in HP-UX! */ | |
565 | if (pc == (CORE_ADDR) 0) | |
566 | return NULL; | |
567 | ||
568 | ALL_OBJFILES (objfile) | |
c5aa993b JM |
569 | { |
570 | struct obj_unwind_info *ui; | |
571 | ui = NULL; | |
572 | if (objfile->obj_private) | |
573 | ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info; | |
c906108c | 574 | |
c5aa993b JM |
575 | if (!ui) |
576 | { | |
577 | read_unwind_info (objfile); | |
578 | if (objfile->obj_private == NULL) | |
579 | error ("Internal error reading unwind information."); /* purecov: deadcode */ | |
580 | ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info; | |
581 | } | |
c906108c | 582 | |
c5aa993b | 583 | /* First, check the cache */ |
c906108c | 584 | |
c5aa993b JM |
585 | if (ui->cache |
586 | && pc >= ui->cache->region_start | |
587 | && pc <= ui->cache->region_end) | |
588 | return ui->cache; | |
c906108c | 589 | |
c5aa993b | 590 | /* Not in the cache, do a binary search */ |
c906108c | 591 | |
c5aa993b JM |
592 | first = 0; |
593 | last = ui->last; | |
c906108c | 594 | |
c5aa993b JM |
595 | while (first <= last) |
596 | { | |
597 | middle = (first + last) / 2; | |
598 | if (pc >= ui->table[middle].region_start | |
599 | && pc <= ui->table[middle].region_end) | |
600 | { | |
601 | ui->cache = &ui->table[middle]; | |
602 | return &ui->table[middle]; | |
603 | } | |
c906108c | 604 | |
c5aa993b JM |
605 | if (pc < ui->table[middle].region_start) |
606 | last = middle - 1; | |
607 | else | |
608 | first = middle + 1; | |
609 | } | |
610 | } /* ALL_OBJFILES() */ | |
c906108c SS |
611 | return NULL; |
612 | } | |
613 | ||
614 | /* Return the adjustment necessary to make for addresses on the stack | |
615 | as presented by hpread.c. | |
616 | ||
617 | This is necessary because of the stack direction on the PA and the | |
618 | bizarre way in which someone (?) decided they wanted to handle | |
619 | frame pointerless code in GDB. */ | |
620 | int | |
621 | hpread_adjust_stack_address (func_addr) | |
622 | CORE_ADDR func_addr; | |
623 | { | |
624 | struct unwind_table_entry *u; | |
625 | ||
626 | u = find_unwind_entry (func_addr); | |
627 | if (!u) | |
628 | return 0; | |
629 | else | |
630 | return u->Total_frame_size << 3; | |
631 | } | |
632 | ||
633 | /* Called to determine if PC is in an interrupt handler of some | |
634 | kind. */ | |
635 | ||
636 | static int | |
637 | pc_in_interrupt_handler (pc) | |
638 | CORE_ADDR pc; | |
639 | { | |
640 | struct unwind_table_entry *u; | |
641 | struct minimal_symbol *msym_us; | |
642 | ||
643 | u = find_unwind_entry (pc); | |
644 | if (!u) | |
645 | return 0; | |
646 | ||
647 | /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though | |
648 | its frame isn't a pure interrupt frame. Deal with this. */ | |
649 | msym_us = lookup_minimal_symbol_by_pc (pc); | |
650 | ||
651 | return u->HP_UX_interrupt_marker && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)); | |
652 | } | |
653 | ||
654 | /* Called when no unwind descriptor was found for PC. Returns 1 if it | |
655 | appears that PC is in a linker stub. */ | |
656 | ||
657 | static int | |
658 | pc_in_linker_stub (pc) | |
659 | CORE_ADDR pc; | |
660 | { | |
661 | int found_magic_instruction = 0; | |
662 | int i; | |
663 | char buf[4]; | |
664 | ||
665 | /* If unable to read memory, assume pc is not in a linker stub. */ | |
666 | if (target_read_memory (pc, buf, 4) != 0) | |
667 | return 0; | |
668 | ||
669 | /* We are looking for something like | |
670 | ||
671 | ; $$dyncall jams RP into this special spot in the frame (RP') | |
672 | ; before calling the "call stub" | |
673 | ldw -18(sp),rp | |
674 | ||
675 | ldsid (rp),r1 ; Get space associated with RP into r1 | |
676 | mtsp r1,sp ; Move it into space register 0 | |
677 | be,n 0(sr0),rp) ; back to your regularly scheduled program */ | |
678 | ||
679 | /* Maximum known linker stub size is 4 instructions. Search forward | |
680 | from the given PC, then backward. */ | |
681 | for (i = 0; i < 4; i++) | |
682 | { | |
683 | /* If we hit something with an unwind, stop searching this direction. */ | |
684 | ||
685 | if (find_unwind_entry (pc + i * 4) != 0) | |
686 | break; | |
687 | ||
688 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
c5aa993b | 689 | return from a cross-space function call. */ |
c906108c SS |
690 | if (read_memory_integer (pc + i * 4, 4) == 0x004010a1) |
691 | { | |
692 | found_magic_instruction = 1; | |
693 | break; | |
694 | } | |
695 | /* Add code to handle long call/branch and argument relocation stubs | |
c5aa993b | 696 | here. */ |
c906108c SS |
697 | } |
698 | ||
699 | if (found_magic_instruction != 0) | |
700 | return 1; | |
701 | ||
702 | /* Now look backward. */ | |
703 | for (i = 0; i < 4; i++) | |
704 | { | |
705 | /* If we hit something with an unwind, stop searching this direction. */ | |
706 | ||
707 | if (find_unwind_entry (pc - i * 4) != 0) | |
708 | break; | |
709 | ||
710 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
c5aa993b | 711 | return from a cross-space function call. */ |
c906108c SS |
712 | if (read_memory_integer (pc - i * 4, 4) == 0x004010a1) |
713 | { | |
714 | found_magic_instruction = 1; | |
715 | break; | |
716 | } | |
717 | /* Add code to handle long call/branch and argument relocation stubs | |
c5aa993b | 718 | here. */ |
c906108c SS |
719 | } |
720 | return found_magic_instruction; | |
721 | } | |
722 | ||
723 | static int | |
c5aa993b | 724 | find_return_regnum (pc) |
c906108c SS |
725 | CORE_ADDR pc; |
726 | { | |
727 | struct unwind_table_entry *u; | |
728 | ||
729 | u = find_unwind_entry (pc); | |
730 | ||
731 | if (!u) | |
732 | return RP_REGNUM; | |
733 | ||
734 | if (u->Millicode) | |
735 | return 31; | |
736 | ||
737 | return RP_REGNUM; | |
738 | } | |
739 | ||
740 | /* Return size of frame, or -1 if we should use a frame pointer. */ | |
741 | static int | |
742 | find_proc_framesize (pc) | |
743 | CORE_ADDR pc; | |
744 | { | |
745 | struct unwind_table_entry *u; | |
746 | struct minimal_symbol *msym_us; | |
747 | ||
748 | /* This may indicate a bug in our callers... */ | |
c5aa993b | 749 | if (pc == (CORE_ADDR) 0) |
c906108c | 750 | return -1; |
c5aa993b | 751 | |
c906108c SS |
752 | u = find_unwind_entry (pc); |
753 | ||
754 | if (!u) | |
755 | { | |
756 | if (pc_in_linker_stub (pc)) | |
757 | /* Linker stubs have a zero size frame. */ | |
758 | return 0; | |
759 | else | |
760 | return -1; | |
761 | } | |
762 | ||
763 | msym_us = lookup_minimal_symbol_by_pc (pc); | |
764 | ||
765 | /* If Save_SP is set, and we're not in an interrupt or signal caller, | |
766 | then we have a frame pointer. Use it. */ | |
767 | if (u->Save_SP && !pc_in_interrupt_handler (pc) | |
768 | && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us))) | |
769 | return -1; | |
770 | ||
771 | return u->Total_frame_size << 3; | |
772 | } | |
773 | ||
774 | /* Return offset from sp at which rp is saved, or 0 if not saved. */ | |
775 | static int rp_saved PARAMS ((CORE_ADDR)); | |
776 | ||
777 | static int | |
778 | rp_saved (pc) | |
779 | CORE_ADDR pc; | |
780 | { | |
781 | struct unwind_table_entry *u; | |
782 | ||
783 | /* A function at, and thus a return PC from, address 0? Not in HP-UX! */ | |
784 | if (pc == (CORE_ADDR) 0) | |
785 | return 0; | |
786 | ||
787 | u = find_unwind_entry (pc); | |
788 | ||
789 | if (!u) | |
790 | { | |
791 | if (pc_in_linker_stub (pc)) | |
792 | /* This is the so-called RP'. */ | |
793 | return -24; | |
794 | else | |
795 | return 0; | |
796 | } | |
797 | ||
798 | if (u->Save_RP) | |
53a5351d | 799 | return (TARGET_PTR_BIT == 64 ? -16 : -20); |
c906108c SS |
800 | else if (u->stub_unwind.stub_type != 0) |
801 | { | |
802 | switch (u->stub_unwind.stub_type) | |
803 | { | |
804 | case EXPORT: | |
805 | case IMPORT: | |
806 | return -24; | |
807 | case PARAMETER_RELOCATION: | |
808 | return -8; | |
809 | default: | |
810 | return 0; | |
811 | } | |
812 | } | |
813 | else | |
814 | return 0; | |
815 | } | |
816 | \f | |
817 | int | |
818 | frameless_function_invocation (frame) | |
819 | struct frame_info *frame; | |
820 | { | |
821 | struct unwind_table_entry *u; | |
822 | ||
823 | u = find_unwind_entry (frame->pc); | |
824 | ||
825 | if (u == 0) | |
826 | return 0; | |
827 | ||
828 | return (u->Total_frame_size == 0 && u->stub_unwind.stub_type == 0); | |
829 | } | |
830 | ||
831 | CORE_ADDR | |
832 | saved_pc_after_call (frame) | |
833 | struct frame_info *frame; | |
834 | { | |
835 | int ret_regnum; | |
836 | CORE_ADDR pc; | |
837 | struct unwind_table_entry *u; | |
838 | ||
839 | ret_regnum = find_return_regnum (get_frame_pc (frame)); | |
840 | pc = read_register (ret_regnum) & ~0x3; | |
c5aa993b | 841 | |
c906108c SS |
842 | /* If PC is in a linker stub, then we need to dig the address |
843 | the stub will return to out of the stack. */ | |
844 | u = find_unwind_entry (pc); | |
845 | if (u && u->stub_unwind.stub_type != 0) | |
846 | return FRAME_SAVED_PC (frame); | |
847 | else | |
848 | return pc; | |
849 | } | |
850 | \f | |
851 | CORE_ADDR | |
852 | hppa_frame_saved_pc (frame) | |
853 | struct frame_info *frame; | |
854 | { | |
855 | CORE_ADDR pc = get_frame_pc (frame); | |
856 | struct unwind_table_entry *u; | |
857 | CORE_ADDR old_pc; | |
c5aa993b JM |
858 | int spun_around_loop = 0; |
859 | int rp_offset = 0; | |
c906108c SS |
860 | |
861 | /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner | |
862 | at the base of the frame in an interrupt handler. Registers within | |
863 | are saved in the exact same order as GDB numbers registers. How | |
864 | convienent. */ | |
865 | if (pc_in_interrupt_handler (pc)) | |
53a5351d JM |
866 | return read_memory_integer (frame->frame + PC_REGNUM * 4, |
867 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
868 | |
869 | #ifdef FRAME_SAVED_PC_IN_SIGTRAMP | |
870 | /* Deal with signal handler caller frames too. */ | |
871 | if (frame->signal_handler_caller) | |
872 | { | |
873 | CORE_ADDR rp; | |
874 | FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp); | |
875 | return rp & ~0x3; | |
876 | } | |
877 | #endif | |
878 | ||
879 | if (frameless_function_invocation (frame)) | |
880 | { | |
881 | int ret_regnum; | |
882 | ||
883 | ret_regnum = find_return_regnum (pc); | |
884 | ||
885 | /* If the next frame is an interrupt frame or a signal | |
c5aa993b JM |
886 | handler caller, then we need to look in the saved |
887 | register area to get the return pointer (the values | |
888 | in the registers may not correspond to anything useful). */ | |
889 | if (frame->next | |
c906108c SS |
890 | && (frame->next->signal_handler_caller |
891 | || pc_in_interrupt_handler (frame->next->pc))) | |
892 | { | |
893 | struct frame_saved_regs saved_regs; | |
894 | ||
895 | get_frame_saved_regs (frame->next, &saved_regs); | |
53a5351d JM |
896 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
897 | TARGET_PTR_BIT / 8) & 0x2) | |
c906108c | 898 | { |
53a5351d JM |
899 | pc = read_memory_integer (saved_regs.regs[31], |
900 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
901 | |
902 | /* Syscalls are really two frames. The syscall stub itself | |
c5aa993b JM |
903 | with a return pointer in %rp and the kernel call with |
904 | a return pointer in %r31. We return the %rp variant | |
905 | if %r31 is the same as frame->pc. */ | |
c906108c | 906 | if (pc == frame->pc) |
53a5351d JM |
907 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
908 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
909 | } |
910 | else | |
53a5351d JM |
911 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
912 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
913 | } |
914 | else | |
915 | pc = read_register (ret_regnum) & ~0x3; | |
916 | } | |
917 | else | |
918 | { | |
919 | spun_around_loop = 0; | |
c5aa993b | 920 | old_pc = pc; |
c906108c | 921 | |
c5aa993b | 922 | restart: |
c906108c SS |
923 | rp_offset = rp_saved (pc); |
924 | ||
925 | /* Similar to code in frameless function case. If the next | |
c5aa993b JM |
926 | frame is a signal or interrupt handler, then dig the right |
927 | information out of the saved register info. */ | |
c906108c SS |
928 | if (rp_offset == 0 |
929 | && frame->next | |
930 | && (frame->next->signal_handler_caller | |
931 | || pc_in_interrupt_handler (frame->next->pc))) | |
932 | { | |
933 | struct frame_saved_regs saved_regs; | |
934 | ||
935 | get_frame_saved_regs (frame->next, &saved_regs); | |
53a5351d JM |
936 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
937 | TARGET_PTR_BIT / 8) & 0x2) | |
c906108c | 938 | { |
53a5351d JM |
939 | pc = read_memory_integer (saved_regs.regs[31], |
940 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
941 | |
942 | /* Syscalls are really two frames. The syscall stub itself | |
c5aa993b JM |
943 | with a return pointer in %rp and the kernel call with |
944 | a return pointer in %r31. We return the %rp variant | |
945 | if %r31 is the same as frame->pc. */ | |
c906108c | 946 | if (pc == frame->pc) |
53a5351d JM |
947 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
948 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
949 | } |
950 | else | |
53a5351d JM |
951 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
952 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
953 | } |
954 | else if (rp_offset == 0) | |
c5aa993b JM |
955 | { |
956 | old_pc = pc; | |
957 | pc = read_register (RP_REGNUM) & ~0x3; | |
958 | } | |
c906108c | 959 | else |
c5aa993b JM |
960 | { |
961 | old_pc = pc; | |
53a5351d JM |
962 | pc = read_memory_integer (frame->frame + rp_offset, |
963 | TARGET_PTR_BIT / 8) & ~0x3; | |
c5aa993b | 964 | } |
c906108c SS |
965 | } |
966 | ||
967 | /* If PC is inside a linker stub, then dig out the address the stub | |
968 | will return to. | |
969 | ||
970 | Don't do this for long branch stubs. Why? For some unknown reason | |
971 | _start is marked as a long branch stub in hpux10. */ | |
972 | u = find_unwind_entry (pc); | |
973 | if (u && u->stub_unwind.stub_type != 0 | |
974 | && u->stub_unwind.stub_type != LONG_BRANCH) | |
975 | { | |
976 | unsigned int insn; | |
977 | ||
978 | /* If this is a dynamic executable, and we're in a signal handler, | |
c5aa993b JM |
979 | then the call chain will eventually point us into the stub for |
980 | _sigreturn. Unlike most cases, we'll be pointed to the branch | |
981 | to the real sigreturn rather than the code after the real branch!. | |
c906108c | 982 | |
c5aa993b JM |
983 | Else, try to dig the address the stub will return to in the normal |
984 | fashion. */ | |
c906108c SS |
985 | insn = read_memory_integer (pc, 4); |
986 | if ((insn & 0xfc00e000) == 0xe8000000) | |
987 | return (pc + extract_17 (insn) + 8) & ~0x3; | |
988 | else | |
989 | { | |
c5aa993b JM |
990 | if (old_pc == pc) |
991 | spun_around_loop++; | |
992 | ||
993 | if (spun_around_loop > 1) | |
994 | { | |
995 | /* We're just about to go around the loop again with | |
996 | no more hope of success. Die. */ | |
997 | error ("Unable to find return pc for this frame"); | |
998 | } | |
999 | else | |
1000 | goto restart; | |
c906108c SS |
1001 | } |
1002 | } | |
1003 | ||
1004 | return pc; | |
1005 | } | |
1006 | \f | |
1007 | /* We need to correct the PC and the FP for the outermost frame when we are | |
1008 | in a system call. */ | |
1009 | ||
1010 | void | |
1011 | init_extra_frame_info (fromleaf, frame) | |
1012 | int fromleaf; | |
1013 | struct frame_info *frame; | |
1014 | { | |
1015 | int flags; | |
1016 | int framesize; | |
1017 | ||
1018 | if (frame->next && !fromleaf) | |
1019 | return; | |
1020 | ||
1021 | /* If the next frame represents a frameless function invocation | |
1022 | then we have to do some adjustments that are normally done by | |
1023 | FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */ | |
1024 | if (fromleaf) | |
1025 | { | |
1026 | /* Find the framesize of *this* frame without peeking at the PC | |
c5aa993b | 1027 | in the current frame structure (it isn't set yet). */ |
c906108c SS |
1028 | framesize = find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame))); |
1029 | ||
1030 | /* Now adjust our base frame accordingly. If we have a frame pointer | |
c5aa993b JM |
1031 | use it, else subtract the size of this frame from the current |
1032 | frame. (we always want frame->frame to point at the lowest address | |
1033 | in the frame). */ | |
c906108c SS |
1034 | if (framesize == -1) |
1035 | frame->frame = TARGET_READ_FP (); | |
1036 | else | |
1037 | frame->frame -= framesize; | |
1038 | return; | |
1039 | } | |
1040 | ||
1041 | flags = read_register (FLAGS_REGNUM); | |
c5aa993b | 1042 | if (flags & 2) /* In system call? */ |
c906108c SS |
1043 | frame->pc = read_register (31) & ~0x3; |
1044 | ||
1045 | /* The outermost frame is always derived from PC-framesize | |
1046 | ||
1047 | One might think frameless innermost frames should have | |
1048 | a frame->frame that is the same as the parent's frame->frame. | |
1049 | That is wrong; frame->frame in that case should be the *high* | |
1050 | address of the parent's frame. It's complicated as hell to | |
1051 | explain, but the parent *always* creates some stack space for | |
1052 | the child. So the child actually does have a frame of some | |
1053 | sorts, and its base is the high address in its parent's frame. */ | |
c5aa993b | 1054 | framesize = find_proc_framesize (frame->pc); |
c906108c SS |
1055 | if (framesize == -1) |
1056 | frame->frame = TARGET_READ_FP (); | |
1057 | else | |
1058 | frame->frame = read_register (SP_REGNUM) - framesize; | |
1059 | } | |
1060 | \f | |
1061 | /* Given a GDB frame, determine the address of the calling function's frame. | |
1062 | This will be used to create a new GDB frame struct, and then | |
1063 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
1064 | ||
1065 | This may involve searching through prologues for several functions | |
1066 | at boundaries where GCC calls HP C code, or where code which has | |
1067 | a frame pointer calls code without a frame pointer. */ | |
1068 | ||
1069 | CORE_ADDR | |
1070 | frame_chain (frame) | |
1071 | struct frame_info *frame; | |
1072 | { | |
1073 | int my_framesize, caller_framesize; | |
1074 | struct unwind_table_entry *u; | |
1075 | CORE_ADDR frame_base; | |
1076 | struct frame_info *tmp_frame; | |
1077 | ||
c5aa993b | 1078 | CORE_ADDR caller_pc; |
c906108c SS |
1079 | |
1080 | struct minimal_symbol *min_frame_symbol; | |
c5aa993b JM |
1081 | struct symbol *frame_symbol; |
1082 | char *frame_symbol_name; | |
c906108c SS |
1083 | |
1084 | /* If this is a threaded application, and we see the | |
1085 | routine "__pthread_exit", treat it as the stack root | |
1086 | for this thread. */ | |
c5aa993b JM |
1087 | min_frame_symbol = lookup_minimal_symbol_by_pc (frame->pc); |
1088 | frame_symbol = find_pc_function (frame->pc); | |
c906108c | 1089 | |
c5aa993b | 1090 | if ((min_frame_symbol != 0) /* && (frame_symbol == 0) */ ) |
c906108c | 1091 | { |
c5aa993b JM |
1092 | /* The test above for "no user function name" would defend |
1093 | against the slim likelihood that a user might define a | |
1094 | routine named "__pthread_exit" and then try to debug it. | |
1095 | ||
1096 | If it weren't commented out, and you tried to debug the | |
1097 | pthread library itself, you'd get errors. | |
1098 | ||
1099 | So for today, we don't make that check. */ | |
1100 | frame_symbol_name = SYMBOL_NAME (min_frame_symbol); | |
1101 | if (frame_symbol_name != 0) | |
1102 | { | |
1103 | if (0 == strncmp (frame_symbol_name, | |
1104 | THREAD_INITIAL_FRAME_SYMBOL, | |
1105 | THREAD_INITIAL_FRAME_SYM_LEN)) | |
1106 | { | |
1107 | /* Pretend we've reached the bottom of the stack. */ | |
1108 | return (CORE_ADDR) 0; | |
1109 | } | |
1110 | } | |
1111 | } /* End of hacky code for threads. */ | |
1112 | ||
c906108c SS |
1113 | /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These |
1114 | are easy; at *sp we have a full save state strucutre which we can | |
1115 | pull the old stack pointer from. Also see frame_saved_pc for | |
1116 | code to dig a saved PC out of the save state structure. */ | |
1117 | if (pc_in_interrupt_handler (frame->pc)) | |
53a5351d JM |
1118 | frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4, |
1119 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1120 | #ifdef FRAME_BASE_BEFORE_SIGTRAMP |
1121 | else if (frame->signal_handler_caller) | |
1122 | { | |
1123 | FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base); | |
1124 | } | |
1125 | #endif | |
1126 | else | |
1127 | frame_base = frame->frame; | |
1128 | ||
1129 | /* Get frame sizes for the current frame and the frame of the | |
1130 | caller. */ | |
1131 | my_framesize = find_proc_framesize (frame->pc); | |
c5aa993b | 1132 | caller_pc = FRAME_SAVED_PC (frame); |
c906108c SS |
1133 | |
1134 | /* If we can't determine the caller's PC, then it's not likely we can | |
1135 | really determine anything meaningful about its frame. We'll consider | |
1136 | this to be stack bottom. */ | |
1137 | if (caller_pc == (CORE_ADDR) 0) | |
1138 | return (CORE_ADDR) 0; | |
1139 | ||
c5aa993b | 1140 | caller_framesize = find_proc_framesize (FRAME_SAVED_PC (frame)); |
c906108c SS |
1141 | |
1142 | /* If caller does not have a frame pointer, then its frame | |
1143 | can be found at current_frame - caller_framesize. */ | |
1144 | if (caller_framesize != -1) | |
1145 | { | |
1146 | return frame_base - caller_framesize; | |
1147 | } | |
1148 | /* Both caller and callee have frame pointers and are GCC compiled | |
1149 | (SAVE_SP bit in unwind descriptor is on for both functions. | |
1150 | The previous frame pointer is found at the top of the current frame. */ | |
1151 | if (caller_framesize == -1 && my_framesize == -1) | |
1152 | { | |
53a5351d | 1153 | return read_memory_integer (frame_base, TARGET_PTR_BIT / 8); |
c906108c SS |
1154 | } |
1155 | /* Caller has a frame pointer, but callee does not. This is a little | |
1156 | more difficult as GCC and HP C lay out locals and callee register save | |
1157 | areas very differently. | |
1158 | ||
1159 | The previous frame pointer could be in a register, or in one of | |
1160 | several areas on the stack. | |
1161 | ||
1162 | Walk from the current frame to the innermost frame examining | |
1163 | unwind descriptors to determine if %r3 ever gets saved into the | |
1164 | stack. If so return whatever value got saved into the stack. | |
1165 | If it was never saved in the stack, then the value in %r3 is still | |
1166 | valid, so use it. | |
1167 | ||
1168 | We use information from unwind descriptors to determine if %r3 | |
1169 | is saved into the stack (Entry_GR field has this information). */ | |
1170 | ||
1171 | tmp_frame = frame; | |
1172 | while (tmp_frame) | |
1173 | { | |
1174 | u = find_unwind_entry (tmp_frame->pc); | |
1175 | ||
1176 | if (!u) | |
1177 | { | |
1178 | /* We could find this information by examining prologues. I don't | |
1179 | think anyone has actually written any tools (not even "strip") | |
1180 | which leave them out of an executable, so maybe this is a moot | |
1181 | point. */ | |
c5aa993b JM |
1182 | /* ??rehrauer: Actually, it's quite possible to stepi your way into |
1183 | code that doesn't have unwind entries. For example, stepping into | |
1184 | the dynamic linker will give you a PC that has none. Thus, I've | |
1185 | disabled this warning. */ | |
c906108c SS |
1186 | #if 0 |
1187 | warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc); | |
1188 | #endif | |
1189 | return (CORE_ADDR) 0; | |
1190 | } | |
1191 | ||
1192 | /* Entry_GR specifies the number of callee-saved general registers | |
c5aa993b | 1193 | saved in the stack. It starts at %r3, so %r3 would be 1. */ |
c906108c SS |
1194 | if (u->Entry_GR >= 1 || u->Save_SP |
1195 | || tmp_frame->signal_handler_caller | |
1196 | || pc_in_interrupt_handler (tmp_frame->pc)) | |
1197 | break; | |
1198 | else | |
1199 | tmp_frame = tmp_frame->next; | |
1200 | } | |
1201 | ||
1202 | if (tmp_frame) | |
1203 | { | |
1204 | /* We may have walked down the chain into a function with a frame | |
c5aa993b | 1205 | pointer. */ |
c906108c SS |
1206 | if (u->Save_SP |
1207 | && !tmp_frame->signal_handler_caller | |
1208 | && !pc_in_interrupt_handler (tmp_frame->pc)) | |
1209 | { | |
53a5351d | 1210 | return read_memory_integer (tmp_frame->frame, TARGET_PTR_BIT / 8); |
c906108c SS |
1211 | } |
1212 | /* %r3 was saved somewhere in the stack. Dig it out. */ | |
c5aa993b | 1213 | else |
c906108c SS |
1214 | { |
1215 | struct frame_saved_regs saved_regs; | |
1216 | ||
1217 | /* Sick. | |
1218 | ||
1219 | For optimization purposes many kernels don't have the | |
1220 | callee saved registers into the save_state structure upon | |
1221 | entry into the kernel for a syscall; the optimization | |
1222 | is usually turned off if the process is being traced so | |
1223 | that the debugger can get full register state for the | |
1224 | process. | |
c5aa993b | 1225 | |
c906108c SS |
1226 | This scheme works well except for two cases: |
1227 | ||
c5aa993b JM |
1228 | * Attaching to a process when the process is in the |
1229 | kernel performing a system call (debugger can't get | |
1230 | full register state for the inferior process since | |
1231 | the process wasn't being traced when it entered the | |
1232 | system call). | |
c906108c | 1233 | |
c5aa993b JM |
1234 | * Register state is not complete if the system call |
1235 | causes the process to core dump. | |
c906108c SS |
1236 | |
1237 | ||
1238 | The following heinous code is an attempt to deal with | |
1239 | the lack of register state in a core dump. It will | |
1240 | fail miserably if the function which performs the | |
1241 | system call has a variable sized stack frame. */ | |
1242 | ||
1243 | get_frame_saved_regs (tmp_frame, &saved_regs); | |
1244 | ||
1245 | /* Abominable hack. */ | |
1246 | if (current_target.to_has_execution == 0 | |
1247 | && ((saved_regs.regs[FLAGS_REGNUM] | |
53a5351d JM |
1248 | && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
1249 | TARGET_PTR_BIT / 8) | |
c906108c SS |
1250 | & 0x2)) |
1251 | || (saved_regs.regs[FLAGS_REGNUM] == 0 | |
1252 | && read_register (FLAGS_REGNUM) & 0x2))) | |
1253 | { | |
1254 | u = find_unwind_entry (FRAME_SAVED_PC (frame)); | |
1255 | if (!u) | |
1256 | { | |
53a5351d JM |
1257 | return read_memory_integer (saved_regs.regs[FP_REGNUM], |
1258 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1259 | } |
1260 | else | |
1261 | { | |
1262 | return frame_base - (u->Total_frame_size << 3); | |
1263 | } | |
1264 | } | |
c5aa993b | 1265 | |
53a5351d JM |
1266 | return read_memory_integer (saved_regs.regs[FP_REGNUM], |
1267 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1268 | } |
1269 | } | |
1270 | else | |
1271 | { | |
1272 | struct frame_saved_regs saved_regs; | |
1273 | ||
1274 | /* Get the innermost frame. */ | |
1275 | tmp_frame = frame; | |
1276 | while (tmp_frame->next != NULL) | |
1277 | tmp_frame = tmp_frame->next; | |
1278 | ||
1279 | get_frame_saved_regs (tmp_frame, &saved_regs); | |
1280 | /* Abominable hack. See above. */ | |
1281 | if (current_target.to_has_execution == 0 | |
1282 | && ((saved_regs.regs[FLAGS_REGNUM] | |
53a5351d JM |
1283 | && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
1284 | TARGET_PTR_BIT / 8) | |
c906108c SS |
1285 | & 0x2)) |
1286 | || (saved_regs.regs[FLAGS_REGNUM] == 0 | |
c5aa993b | 1287 | && read_register (FLAGS_REGNUM) & 0x2))) |
c906108c SS |
1288 | { |
1289 | u = find_unwind_entry (FRAME_SAVED_PC (frame)); | |
1290 | if (!u) | |
1291 | { | |
53a5351d JM |
1292 | return read_memory_integer (saved_regs.regs[FP_REGNUM], |
1293 | TARGET_PTR_BIT / 8); | |
c906108c | 1294 | } |
c5aa993b JM |
1295 | else |
1296 | { | |
1297 | return frame_base - (u->Total_frame_size << 3); | |
1298 | } | |
c906108c | 1299 | } |
c5aa993b | 1300 | |
c906108c | 1301 | /* The value in %r3 was never saved into the stack (thus %r3 still |
c5aa993b | 1302 | holds the value of the previous frame pointer). */ |
c906108c SS |
1303 | return TARGET_READ_FP (); |
1304 | } | |
1305 | } | |
c906108c | 1306 | \f |
c5aa993b | 1307 | |
c906108c SS |
1308 | /* To see if a frame chain is valid, see if the caller looks like it |
1309 | was compiled with gcc. */ | |
1310 | ||
1311 | int | |
1312 | hppa_frame_chain_valid (chain, thisframe) | |
1313 | CORE_ADDR chain; | |
1314 | struct frame_info *thisframe; | |
1315 | { | |
1316 | struct minimal_symbol *msym_us; | |
1317 | struct minimal_symbol *msym_start; | |
1318 | struct unwind_table_entry *u, *next_u = NULL; | |
1319 | struct frame_info *next; | |
1320 | ||
1321 | if (!chain) | |
1322 | return 0; | |
1323 | ||
1324 | u = find_unwind_entry (thisframe->pc); | |
1325 | ||
1326 | if (u == NULL) | |
1327 | return 1; | |
1328 | ||
1329 | /* We can't just check that the same of msym_us is "_start", because | |
1330 | someone idiotically decided that they were going to make a Ltext_end | |
1331 | symbol with the same address. This Ltext_end symbol is totally | |
1332 | indistinguishable (as nearly as I can tell) from the symbol for a function | |
1333 | which is (legitimately, since it is in the user's namespace) | |
1334 | named Ltext_end, so we can't just ignore it. */ | |
1335 | msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); | |
1336 | msym_start = lookup_minimal_symbol ("_start", NULL, NULL); | |
1337 | if (msym_us | |
1338 | && msym_start | |
1339 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) | |
1340 | return 0; | |
1341 | ||
1342 | /* Grrrr. Some new idiot decided that they don't want _start for the | |
1343 | PRO configurations; $START$ calls main directly.... Deal with it. */ | |
1344 | msym_start = lookup_minimal_symbol ("$START$", NULL, NULL); | |
1345 | if (msym_us | |
1346 | && msym_start | |
1347 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) | |
1348 | return 0; | |
1349 | ||
1350 | next = get_next_frame (thisframe); | |
1351 | if (next) | |
1352 | next_u = find_unwind_entry (next->pc); | |
1353 | ||
1354 | /* If this frame does not save SP, has no stack, isn't a stub, | |
1355 | and doesn't "call" an interrupt routine or signal handler caller, | |
1356 | then its not valid. */ | |
1357 | if (u->Save_SP || u->Total_frame_size || u->stub_unwind.stub_type != 0 | |
1358 | || (thisframe->next && thisframe->next->signal_handler_caller) | |
1359 | || (next_u && next_u->HP_UX_interrupt_marker)) | |
1360 | return 1; | |
1361 | ||
1362 | if (pc_in_linker_stub (thisframe->pc)) | |
1363 | return 1; | |
1364 | ||
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | /* | |
1369 | These functions deal with saving and restoring register state | |
1370 | around a function call in the inferior. They keep the stack | |
1371 | double-word aligned; eventually, on an hp700, the stack will have | |
1372 | to be aligned to a 64-byte boundary. */ | |
1373 | ||
1374 | void | |
1375 | push_dummy_frame (inf_status) | |
1376 | struct inferior_status *inf_status; | |
1377 | { | |
1378 | CORE_ADDR sp, pc, pcspace; | |
1379 | register int regnum; | |
53a5351d | 1380 | CORE_ADDR int_buffer; |
c906108c SS |
1381 | double freg_buffer; |
1382 | ||
1383 | /* Oh, what a hack. If we're trying to perform an inferior call | |
1384 | while the inferior is asleep, we have to make sure to clear | |
1385 | the "in system call" bit in the flag register (the call will | |
1386 | start after the syscall returns, so we're no longer in the system | |
1387 | call!) This state is kept in "inf_status", change it there. | |
1388 | ||
1389 | We also need a number of horrid hacks to deal with lossage in the | |
1390 | PC queue registers (apparently they're not valid when the in syscall | |
1391 | bit is set). */ | |
1392 | pc = target_read_pc (inferior_pid); | |
1393 | int_buffer = read_register (FLAGS_REGNUM); | |
1394 | if (int_buffer & 0x2) | |
1395 | { | |
1396 | unsigned int sid; | |
1397 | int_buffer &= ~0x2; | |
7a292a7a SS |
1398 | write_inferior_status_register (inf_status, 0, int_buffer); |
1399 | write_inferior_status_register (inf_status, PCOQ_HEAD_REGNUM, pc + 0); | |
1400 | write_inferior_status_register (inf_status, PCOQ_TAIL_REGNUM, pc + 4); | |
c906108c SS |
1401 | sid = (pc >> 30) & 0x3; |
1402 | if (sid == 0) | |
1403 | pcspace = read_register (SR4_REGNUM); | |
1404 | else | |
1405 | pcspace = read_register (SR4_REGNUM + 4 + sid); | |
7a292a7a SS |
1406 | write_inferior_status_register (inf_status, PCSQ_HEAD_REGNUM, pcspace); |
1407 | write_inferior_status_register (inf_status, PCSQ_TAIL_REGNUM, pcspace); | |
c906108c SS |
1408 | } |
1409 | else | |
1410 | pcspace = read_register (PCSQ_HEAD_REGNUM); | |
1411 | ||
1412 | /* Space for "arguments"; the RP goes in here. */ | |
1413 | sp = read_register (SP_REGNUM) + 48; | |
1414 | int_buffer = read_register (RP_REGNUM) | 0x3; | |
53a5351d JM |
1415 | |
1416 | /* The 32bit and 64bit ABIs save the return pointer into different | |
1417 | stack slots. */ | |
1418 | if (REGISTER_SIZE == 8) | |
1419 | write_memory (sp - 16, (char *) &int_buffer, REGISTER_SIZE); | |
1420 | else | |
1421 | write_memory (sp - 20, (char *) &int_buffer, REGISTER_SIZE); | |
c906108c SS |
1422 | |
1423 | int_buffer = TARGET_READ_FP (); | |
53a5351d | 1424 | write_memory (sp, (char *) &int_buffer, REGISTER_SIZE); |
c906108c SS |
1425 | |
1426 | write_register (FP_REGNUM, sp); | |
1427 | ||
53a5351d | 1428 | sp += 2 * REGISTER_SIZE; |
c906108c SS |
1429 | |
1430 | for (regnum = 1; regnum < 32; regnum++) | |
1431 | if (regnum != RP_REGNUM && regnum != FP_REGNUM) | |
1432 | sp = push_word (sp, read_register (regnum)); | |
1433 | ||
53a5351d JM |
1434 | /* This is not necessary for the 64bit ABI. In fact it is dangerous. */ |
1435 | if (REGISTER_SIZE != 8) | |
1436 | sp += 4; | |
c906108c SS |
1437 | |
1438 | for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) | |
1439 | { | |
c5aa993b JM |
1440 | read_register_bytes (REGISTER_BYTE (regnum), (char *) &freg_buffer, 8); |
1441 | sp = push_bytes (sp, (char *) &freg_buffer, 8); | |
c906108c SS |
1442 | } |
1443 | sp = push_word (sp, read_register (IPSW_REGNUM)); | |
1444 | sp = push_word (sp, read_register (SAR_REGNUM)); | |
1445 | sp = push_word (sp, pc); | |
1446 | sp = push_word (sp, pcspace); | |
1447 | sp = push_word (sp, pc + 4); | |
1448 | sp = push_word (sp, pcspace); | |
1449 | write_register (SP_REGNUM, sp); | |
1450 | } | |
1451 | ||
1452 | static void | |
1453 | find_dummy_frame_regs (frame, frame_saved_regs) | |
1454 | struct frame_info *frame; | |
1455 | struct frame_saved_regs *frame_saved_regs; | |
1456 | { | |
1457 | CORE_ADDR fp = frame->frame; | |
1458 | int i; | |
1459 | ||
53a5351d JM |
1460 | /* The 32bit and 64bit ABIs save RP into different locations. */ |
1461 | if (REGISTER_SIZE == 8) | |
1462 | frame_saved_regs->regs[RP_REGNUM] = (fp - 16) & ~0x3; | |
1463 | else | |
1464 | frame_saved_regs->regs[RP_REGNUM] = (fp - 20) & ~0x3; | |
1465 | ||
c906108c | 1466 | frame_saved_regs->regs[FP_REGNUM] = fp; |
c906108c | 1467 | |
53a5351d JM |
1468 | frame_saved_regs->regs[1] = fp + (2 * REGISTER_SIZE); |
1469 | ||
1470 | for (fp += 3 * REGISTER_SIZE, i = 3; i < 32; i++) | |
c906108c SS |
1471 | { |
1472 | if (i != FP_REGNUM) | |
1473 | { | |
1474 | frame_saved_regs->regs[i] = fp; | |
53a5351d | 1475 | fp += REGISTER_SIZE; |
c906108c SS |
1476 | } |
1477 | } | |
1478 | ||
53a5351d JM |
1479 | /* This is not necessary or desirable for the 64bit ABI. */ |
1480 | if (REGISTER_SIZE != 8) | |
1481 | fp += 4; | |
1482 | ||
c906108c SS |
1483 | for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8) |
1484 | frame_saved_regs->regs[i] = fp; | |
1485 | ||
1486 | frame_saved_regs->regs[IPSW_REGNUM] = fp; | |
53a5351d JM |
1487 | frame_saved_regs->regs[SAR_REGNUM] = fp + REGISTER_SIZE; |
1488 | frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 2 * REGISTER_SIZE; | |
1489 | frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 3 * REGISTER_SIZE; | |
1490 | frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 4 * REGISTER_SIZE; | |
1491 | frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 5 * REGISTER_SIZE; | |
c906108c SS |
1492 | } |
1493 | ||
1494 | void | |
1495 | hppa_pop_frame () | |
1496 | { | |
1497 | register struct frame_info *frame = get_current_frame (); | |
1498 | register CORE_ADDR fp, npc, target_pc; | |
1499 | register int regnum; | |
1500 | struct frame_saved_regs fsr; | |
1501 | double freg_buffer; | |
1502 | ||
1503 | fp = FRAME_FP (frame); | |
1504 | get_frame_saved_regs (frame, &fsr); | |
1505 | ||
1506 | #ifndef NO_PC_SPACE_QUEUE_RESTORE | |
c5aa993b | 1507 | if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */ |
c906108c SS |
1508 | restore_pc_queue (&fsr); |
1509 | #endif | |
1510 | ||
1511 | for (regnum = 31; regnum > 0; regnum--) | |
1512 | if (fsr.regs[regnum]) | |
53a5351d JM |
1513 | write_register (regnum, read_memory_integer (fsr.regs[regnum], |
1514 | REGISTER_SIZE)); | |
c906108c | 1515 | |
c5aa993b | 1516 | for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM; regnum--) |
c906108c SS |
1517 | if (fsr.regs[regnum]) |
1518 | { | |
c5aa993b JM |
1519 | read_memory (fsr.regs[regnum], (char *) &freg_buffer, 8); |
1520 | write_register_bytes (REGISTER_BYTE (regnum), (char *) &freg_buffer, 8); | |
c906108c SS |
1521 | } |
1522 | ||
1523 | if (fsr.regs[IPSW_REGNUM]) | |
1524 | write_register (IPSW_REGNUM, | |
53a5351d JM |
1525 | read_memory_integer (fsr.regs[IPSW_REGNUM], |
1526 | REGISTER_SIZE)); | |
c906108c SS |
1527 | |
1528 | if (fsr.regs[SAR_REGNUM]) | |
1529 | write_register (SAR_REGNUM, | |
53a5351d JM |
1530 | read_memory_integer (fsr.regs[SAR_REGNUM], |
1531 | REGISTER_SIZE)); | |
c906108c SS |
1532 | |
1533 | /* If the PC was explicitly saved, then just restore it. */ | |
1534 | if (fsr.regs[PCOQ_TAIL_REGNUM]) | |
1535 | { | |
53a5351d JM |
1536 | npc = read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], |
1537 | REGISTER_SIZE); | |
c906108c SS |
1538 | write_register (PCOQ_TAIL_REGNUM, npc); |
1539 | } | |
1540 | /* Else use the value in %rp to set the new PC. */ | |
c5aa993b | 1541 | else |
c906108c SS |
1542 | { |
1543 | npc = read_register (RP_REGNUM); | |
1544 | write_pc (npc); | |
1545 | } | |
1546 | ||
53a5351d | 1547 | write_register (FP_REGNUM, read_memory_integer (fp, REGISTER_SIZE)); |
c906108c | 1548 | |
c5aa993b | 1549 | if (fsr.regs[IPSW_REGNUM]) /* call dummy */ |
c906108c SS |
1550 | write_register (SP_REGNUM, fp - 48); |
1551 | else | |
1552 | write_register (SP_REGNUM, fp); | |
1553 | ||
1554 | /* The PC we just restored may be inside a return trampoline. If so | |
1555 | we want to restart the inferior and run it through the trampoline. | |
1556 | ||
1557 | Do this by setting a momentary breakpoint at the location the | |
1558 | trampoline returns to. | |
1559 | ||
1560 | Don't skip through the trampoline if we're popping a dummy frame. */ | |
1561 | target_pc = SKIP_TRAMPOLINE_CODE (npc & ~0x3) & ~0x3; | |
1562 | if (target_pc && !fsr.regs[IPSW_REGNUM]) | |
1563 | { | |
1564 | struct symtab_and_line sal; | |
1565 | struct breakpoint *breakpoint; | |
1566 | struct cleanup *old_chain; | |
1567 | ||
1568 | /* Set up our breakpoint. Set it to be silent as the MI code | |
c5aa993b | 1569 | for "return_command" will print the frame we returned to. */ |
c906108c SS |
1570 | sal = find_pc_line (target_pc, 0); |
1571 | sal.pc = target_pc; | |
1572 | breakpoint = set_momentary_breakpoint (sal, NULL, bp_finish); | |
1573 | breakpoint->silent = 1; | |
1574 | ||
1575 | /* So we can clean things up. */ | |
1576 | old_chain = make_cleanup ((make_cleanup_func) delete_breakpoint, breakpoint); | |
1577 | ||
1578 | /* Start up the inferior. */ | |
1579 | clear_proceed_status (); | |
1580 | proceed_to_finish = 1; | |
c5aa993b | 1581 | proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_DEFAULT, 0); |
c906108c SS |
1582 | |
1583 | /* Perform our cleanups. */ | |
1584 | do_cleanups (old_chain); | |
1585 | } | |
1586 | flush_cached_frames (); | |
1587 | } | |
1588 | ||
1589 | /* After returning to a dummy on the stack, restore the instruction | |
1590 | queue space registers. */ | |
1591 | ||
1592 | static int | |
1593 | restore_pc_queue (fsr) | |
1594 | struct frame_saved_regs *fsr; | |
1595 | { | |
1596 | CORE_ADDR pc = read_pc (); | |
53a5351d JM |
1597 | CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], |
1598 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1599 | struct target_waitstatus w; |
1600 | int insn_count; | |
1601 | ||
1602 | /* Advance past break instruction in the call dummy. */ | |
1603 | write_register (PCOQ_HEAD_REGNUM, pc + 4); | |
1604 | write_register (PCOQ_TAIL_REGNUM, pc + 8); | |
1605 | ||
1606 | /* HPUX doesn't let us set the space registers or the space | |
1607 | registers of the PC queue through ptrace. Boo, hiss. | |
1608 | Conveniently, the call dummy has this sequence of instructions | |
1609 | after the break: | |
c5aa993b JM |
1610 | mtsp r21, sr0 |
1611 | ble,n 0(sr0, r22) | |
1612 | ||
c906108c SS |
1613 | So, load up the registers and single step until we are in the |
1614 | right place. */ | |
1615 | ||
53a5351d JM |
1616 | write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], |
1617 | REGISTER_SIZE)); | |
c906108c SS |
1618 | write_register (22, new_pc); |
1619 | ||
1620 | for (insn_count = 0; insn_count < 3; insn_count++) | |
1621 | { | |
1622 | /* FIXME: What if the inferior gets a signal right now? Want to | |
c5aa993b JM |
1623 | merge this into wait_for_inferior (as a special kind of |
1624 | watchpoint? By setting a breakpoint at the end? Is there | |
1625 | any other choice? Is there *any* way to do this stuff with | |
1626 | ptrace() or some equivalent?). */ | |
c906108c SS |
1627 | resume (1, 0); |
1628 | target_wait (inferior_pid, &w); | |
1629 | ||
1630 | if (w.kind == TARGET_WAITKIND_SIGNALLED) | |
c5aa993b JM |
1631 | { |
1632 | stop_signal = w.value.sig; | |
1633 | terminal_ours_for_output (); | |
1634 | printf_unfiltered ("\nProgram terminated with signal %s, %s.\n", | |
c906108c SS |
1635 | target_signal_to_name (stop_signal), |
1636 | target_signal_to_string (stop_signal)); | |
c5aa993b JM |
1637 | gdb_flush (gdb_stdout); |
1638 | return 0; | |
1639 | } | |
c906108c SS |
1640 | } |
1641 | target_terminal_ours (); | |
1642 | target_fetch_registers (-1); | |
1643 | return 1; | |
1644 | } | |
1645 | ||
53a5351d JM |
1646 | /* This function pushes a stack frame with arguments as part of the |
1647 | inferior function calling mechanism. | |
c906108c | 1648 | |
53a5351d JM |
1649 | For PAs the stack always grows to higher addresses. However the arguments |
1650 | may grow to either higher or lower addresses depending on which ABI is | |
1651 | currently in use. | |
c906108c | 1652 | |
53a5351d JM |
1653 | We simply allocate the appropriate amount of stack space and put |
1654 | arguments into their proper slots. The call dummy code will copy | |
1655 | arguments into registers as needed by the ABI. | |
c906108c | 1656 | |
53a5351d JM |
1657 | Note for the PA64 ABI we load up the argument pointer since the caller |
1658 | must provide the argument pointer to the callee. */ | |
1659 | ||
c906108c SS |
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)); |
53a5351d JM |
1670 | |
1671 | /* array of arguments' lengths: real lengths in bytes, not aligned to | |
1672 | word size */ | |
c5aa993b | 1673 | int *lengths = (int *) alloca (nargs * sizeof (int)); |
c906108c | 1674 | |
53a5351d JM |
1675 | /* The value of SP as it was passed into this function after |
1676 | aligning. */ | |
1677 | CORE_ADDR orig_sp = STACK_ALIGN (sp); | |
c906108c | 1678 | |
53a5351d JM |
1679 | /* The number of stack bytes occupied by the current argument. */ |
1680 | int bytes_reserved; | |
1681 | ||
1682 | /* The total number of bytes reserved for the arguments. */ | |
1683 | int cum_bytes_reserved = 0; | |
c906108c | 1684 | |
53a5351d JM |
1685 | /* Similarly, but aligned. */ |
1686 | int cum_bytes_aligned = 0; | |
1687 | int i; | |
c5aa993b | 1688 | |
53a5351d | 1689 | /* Iterate over each argument provided by the user. */ |
c906108c SS |
1690 | for (i = 0; i < nargs; i++) |
1691 | { | |
c906108c SS |
1692 | lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i])); |
1693 | ||
53a5351d JM |
1694 | /* Align the size of the argument to the word size for this |
1695 | target. */ | |
1696 | bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE; | |
c906108c | 1697 | |
53a5351d | 1698 | #ifdef ARGS_GROW_DOWNWARD |
c906108c | 1699 | offset[i] = cum_bytes_reserved + lengths[i]; |
53a5351d JM |
1700 | #else |
1701 | /* If the arguments grow towards lower addresses, then we want | |
1702 | offset[i] to point to the start of the argument rather than | |
1703 | the end of the argument. */ | |
1704 | offset[i] = cum_bytes_reserved; | |
1705 | ||
1706 | offset[i] += (lengths[i] < REGISTER_SIZE | |
1707 | ? REGISTER_SIZE - lengths[i] : 0); | |
1708 | #endif | |
c906108c | 1709 | |
53a5351d JM |
1710 | /* If the argument is a double word argument, then it needs to be |
1711 | double word aligned. | |
1712 | ||
1713 | ?!? I do not think this code is correct when !ARGS_GROW_DOWNWAR. */ | |
1714 | if ((bytes_reserved == 2 * REGISTER_SIZE) | |
1715 | && (offset[i] % 2 * REGISTER_SIZE)) | |
c5aa993b JM |
1716 | { |
1717 | int new_offset = 0; | |
53a5351d JM |
1718 | /* BYTES_RESERVED is already aligned to the word, so we put |
1719 | the argument at one word more down the stack. | |
1720 | ||
1721 | This will leave one empty word on the stack, and one unused | |
1722 | register as mandated by the ABI. */ | |
1723 | new_offset = ((offset[i] + 2 * REGISTER_SIZE - 1) | |
1724 | & -(2 * REGISTER_SIZE)); | |
1725 | ||
1726 | if ((new_offset - offset[i]) >= 2 * REGISTER_SIZE) | |
c5aa993b | 1727 | { |
53a5351d JM |
1728 | bytes_reserved += REGISTER_SIZE; |
1729 | offset[i] += REGISTER_SIZE; | |
c5aa993b JM |
1730 | } |
1731 | } | |
c906108c SS |
1732 | |
1733 | cum_bytes_reserved += bytes_reserved; | |
1734 | ||
1735 | } | |
1736 | ||
53a5351d JM |
1737 | /* CUM_BYTES_RESERVED already accounts for all the arguments |
1738 | passed by the user. However, the ABIs mandate minimum stack space | |
1739 | allocations for outgoing arguments. | |
1740 | ||
1741 | The ABIs also mandate minimum stack alignments which we must | |
1742 | preserve. */ | |
c906108c | 1743 | cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved); |
53a5351d JM |
1744 | sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE); |
1745 | ||
1746 | /* Now write each of the args at the proper offset down the stack. | |
1747 | ||
1748 | The two ABIs write arguments in different directions using different | |
1749 | starting points. What fun. | |
c906108c | 1750 | |
53a5351d JM |
1751 | ?!? We need to promote values to a full register instead of skipping |
1752 | words in the stack. */ | |
1753 | #ifndef ARGS_GROW_DOWNWARD | |
1754 | for (i = 0; i < nargs; i++) | |
1755 | write_memory (orig_sp + offset[i], VALUE_CONTENTS (args[i]), lengths[i]); | |
1756 | #else | |
c906108c SS |
1757 | for (i = 0; i < nargs; i++) |
1758 | write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]); | |
53a5351d | 1759 | #endif |
c906108c | 1760 | |
53a5351d JM |
1761 | /* If a structure has to be returned, set up register 28 to hold its |
1762 | address */ | |
c906108c SS |
1763 | if (struct_return) |
1764 | write_register (28, struct_addr); | |
1765 | ||
53a5351d JM |
1766 | #ifndef ARGS_GROW_DOWNWARD |
1767 | /* For the PA64 we must pass a pointer to the outgoing argument list. | |
1768 | The ABI mandates that the pointer should point to the first byte of | |
1769 | storage beyond the register flushback area. | |
1770 | ||
1771 | However, the call dummy expects the outgoing argument pointer to | |
1772 | be passed in register %r4. */ | |
1773 | write_register (4, orig_sp + REG_PARM_STACK_SPACE); | |
1774 | ||
1775 | /* ?!? This needs further work. We need to set up the global data | |
1776 | pointer for this procedure. This assumes the same global pointer | |
1777 | for every procedure. The call dummy expects the dp value to | |
1778 | be passed in register %r6. */ | |
1779 | write_register (6, read_register (27)); | |
1780 | #endif | |
1781 | ||
1782 | /* The stack will have 32 bytes of additional space for a frame marker. */ | |
c906108c SS |
1783 | return sp + 32; |
1784 | } | |
1785 | ||
1786 | ||
1787 | /* elz: this function returns a value which is built looking at the given address. | |
1788 | It is called from call_function_by_hand, in case we need to return a | |
1789 | value which is larger than 64 bits, and it is stored in the stack rather than | |
1790 | in the registers r28 and r29 or fr4. | |
1791 | This function does the same stuff as value_being_returned in values.c, but | |
1792 | gets the value from the stack rather than from the buffer where all the | |
1793 | registers were saved when the function called completed. */ | |
1794 | value_ptr | |
c5aa993b | 1795 | hppa_value_returned_from_stack (valtype, addr) |
c906108c SS |
1796 | register struct type *valtype; |
1797 | CORE_ADDR addr; | |
1798 | { | |
1799 | register value_ptr val; | |
1800 | ||
1801 | val = allocate_value (valtype); | |
1802 | CHECK_TYPEDEF (valtype); | |
c5aa993b | 1803 | target_read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (valtype)); |
c906108c SS |
1804 | |
1805 | return val; | |
1806 | } | |
1807 | ||
1808 | ||
1809 | ||
1810 | /* elz: Used to lookup a symbol in the shared libraries. | |
c5aa993b JM |
1811 | This function calls shl_findsym, indirectly through a |
1812 | call to __d_shl_get. __d_shl_get is in end.c, which is always | |
1813 | linked in by the hp compilers/linkers. | |
1814 | The call to shl_findsym cannot be made directly because it needs | |
1815 | to be active in target address space. | |
1816 | inputs: - minimal symbol pointer for the function we want to look up | |
1817 | - address in target space of the descriptor for the library | |
1818 | where we want to look the symbol up. | |
1819 | This address is retrieved using the | |
1820 | som_solib_get_solib_by_pc function (somsolib.c). | |
1821 | output: - real address in the library of the function. | |
1822 | note: the handle can be null, in which case shl_findsym will look for | |
1823 | the symbol in all the loaded shared libraries. | |
1824 | files to look at if you need reference on this stuff: | |
1825 | dld.c, dld_shl_findsym.c | |
1826 | end.c | |
1827 | man entry for shl_findsym */ | |
c906108c SS |
1828 | |
1829 | CORE_ADDR | |
c5aa993b JM |
1830 | find_stub_with_shl_get (function, handle) |
1831 | struct minimal_symbol *function; | |
1832 | CORE_ADDR handle; | |
c906108c | 1833 | { |
c5aa993b JM |
1834 | struct symbol *get_sym, *symbol2; |
1835 | struct minimal_symbol *buff_minsym, *msymbol; | |
1836 | struct type *ftype; | |
1837 | value_ptr *args; | |
1838 | value_ptr funcval, val; | |
1839 | ||
1840 | int x, namelen, err_value, tmp = -1; | |
1841 | CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; | |
1842 | CORE_ADDR stub_addr; | |
1843 | ||
1844 | ||
1845 | args = (value_ptr *) alloca (sizeof (value_ptr) * 8); /* 6 for the arguments and one null one??? */ | |
1846 | funcval = find_function_in_inferior ("__d_shl_get"); | |
1847 | get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_NAMESPACE, NULL, NULL); | |
1848 | buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL); | |
1849 | msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); | |
1850 | symbol2 = lookup_symbol ("__shldp", NULL, VAR_NAMESPACE, NULL, NULL); | |
1851 | endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); | |
1852 | namelen = strlen (SYMBOL_NAME (function)); | |
1853 | value_return_addr = endo_buff_addr + namelen; | |
1854 | ftype = check_typedef (SYMBOL_TYPE (get_sym)); | |
1855 | ||
1856 | /* do alignment */ | |
1857 | if ((x = value_return_addr % 64) != 0) | |
1858 | value_return_addr = value_return_addr + 64 - x; | |
1859 | ||
1860 | errno_return_addr = value_return_addr + 64; | |
1861 | ||
1862 | ||
1863 | /* set up stuff needed by __d_shl_get in buffer in end.o */ | |
1864 | ||
1865 | target_write_memory (endo_buff_addr, SYMBOL_NAME (function), namelen); | |
1866 | ||
1867 | target_write_memory (value_return_addr, (char *) &tmp, 4); | |
1868 | ||
1869 | target_write_memory (errno_return_addr, (char *) &tmp, 4); | |
1870 | ||
1871 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
1872 | (char *) &handle, 4); | |
1873 | ||
1874 | /* now prepare the arguments for the call */ | |
1875 | ||
1876 | args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12); | |
1877 | args[1] = value_from_longest (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol)); | |
1878 | args[2] = value_from_longest (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr); | |
1879 | args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE); | |
1880 | args[4] = value_from_longest (TYPE_FIELD_TYPE (ftype, 4), value_return_addr); | |
1881 | args[5] = value_from_longest (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr); | |
1882 | ||
1883 | /* now call the function */ | |
1884 | ||
1885 | val = call_function_by_hand (funcval, 6, args); | |
1886 | ||
1887 | /* now get the results */ | |
1888 | ||
1889 | target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value)); | |
1890 | ||
1891 | target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr)); | |
1892 | if (stub_addr <= 0) | |
1893 | error ("call to __d_shl_get failed, error code is %d", err_value); /* purecov: deadcode */ | |
1894 | ||
1895 | return (stub_addr); | |
c906108c SS |
1896 | } |
1897 | ||
c5aa993b | 1898 | /* Cover routine for find_stub_with_shl_get to pass to catch_errors */ |
a0b3c4fd JM |
1899 | static int |
1900 | cover_find_stub_with_shl_get (PTR args_untyped) | |
c906108c | 1901 | { |
a0b3c4fd JM |
1902 | args_for_find_stub *args = args_untyped; |
1903 | args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle); | |
1904 | return 0; | |
c906108c SS |
1905 | } |
1906 | ||
c906108c SS |
1907 | /* Insert the specified number of args and function address |
1908 | into a call sequence of the above form stored at DUMMYNAME. | |
1909 | ||
1910 | On the hppa we need to call the stack dummy through $$dyncall. | |
1911 | Therefore our version of FIX_CALL_DUMMY takes an extra argument, | |
1912 | real_pc, which is the location where gdb should start up the | |
cce74817 JM |
1913 | inferior to do the function call. |
1914 | ||
1915 | This has to work across several versions of hpux, bsd, osf1. It has to | |
1916 | work regardless of what compiler was used to build the inferior program. | |
1917 | It should work regardless of whether or not end.o is available. It has | |
1918 | to work even if gdb can not call into the dynamic loader in the inferior | |
1919 | to query it for symbol names and addresses. | |
1920 | ||
1921 | Yes, all those cases should work. Luckily code exists to handle most | |
1922 | of them. The complexity is in selecting exactly what scheme should | |
1923 | be used to perform the inferior call. | |
1924 | ||
1925 | At the current time this routine is known not to handle cases where | |
1926 | the program was linked with HP's compiler without including end.o. | |
1927 | ||
1928 | Please contact Jeff Law (law@cygnus.com) before changing this code. */ | |
c906108c SS |
1929 | |
1930 | CORE_ADDR | |
1931 | hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) | |
1932 | char *dummy; | |
1933 | CORE_ADDR pc; | |
1934 | CORE_ADDR fun; | |
1935 | int nargs; | |
1936 | value_ptr *args; | |
1937 | struct type *type; | |
1938 | int gcc_p; | |
1939 | { | |
1940 | CORE_ADDR dyncall_addr; | |
1941 | struct minimal_symbol *msymbol; | |
1942 | struct minimal_symbol *trampoline; | |
1943 | int flags = read_register (FLAGS_REGNUM); | |
cce74817 JM |
1944 | struct unwind_table_entry *u = NULL; |
1945 | CORE_ADDR new_stub = 0; | |
1946 | CORE_ADDR solib_handle = 0; | |
1947 | ||
1948 | /* Nonzero if we will use GCC's PLT call routine. This routine must be | |
c5aa993b | 1949 | passed an import stub, not a PLABEL. It is also necessary to set %r19 |
cce74817 | 1950 | (the PIC register) before performing the call. |
c906108c | 1951 | |
cce74817 JM |
1952 | If zero, then we are using __d_plt_call (HP's PLT call routine) or we |
1953 | are calling the target directly. When using __d_plt_call we want to | |
1954 | use a PLABEL instead of an import stub. */ | |
1955 | int using_gcc_plt_call = 1; | |
1956 | ||
53a5351d JM |
1957 | #ifdef GDB_TARGET_IS_HPPA_20W |
1958 | /* We currently use completely different code for the PA2.0W inferior | |
1959 | function call sequences. This needs to be cleaned up. */ | |
1960 | { | |
1961 | CORE_ADDR pcsqh, pcsqt, pcoqh, pcoqt, sr5; | |
1962 | struct target_waitstatus w; | |
1963 | int inst1, inst2; | |
1964 | char buf[4]; | |
1965 | int status; | |
1966 | struct objfile *objfile; | |
1967 | ||
1968 | /* We can not modify the PC space queues directly, so we start | |
1969 | up the inferior and execute a couple instructions to set the | |
1970 | space queues so that they point to the call dummy in the stack. */ | |
1971 | pcsqh = read_register (PCSQ_HEAD_REGNUM); | |
1972 | sr5 = read_register (SR5_REGNUM); | |
1973 | if (1) | |
1974 | { | |
1975 | pcoqh = read_register (PCOQ_HEAD_REGNUM); | |
1976 | pcoqt = read_register (PCOQ_TAIL_REGNUM); | |
1977 | if (target_read_memory (pcoqh, buf, 4) != 0) | |
1978 | error ("Couldn't modify space queue\n"); | |
1979 | inst1 = extract_unsigned_integer (buf, 4); | |
1980 | ||
1981 | if (target_read_memory (pcoqt, buf, 4) != 0) | |
1982 | error ("Couldn't modify space queue\n"); | |
1983 | inst2 = extract_unsigned_integer (buf, 4); | |
1984 | ||
1985 | /* BVE (r1) */ | |
1986 | *((int *) buf) = 0xe820d000; | |
1987 | if (target_write_memory (pcoqh, buf, 4) != 0) | |
1988 | error ("Couldn't modify space queue\n"); | |
1989 | ||
1990 | /* NOP */ | |
1991 | *((int *) buf) = 0x08000240; | |
1992 | if (target_write_memory (pcoqt, buf, 4) != 0) | |
1993 | { | |
1994 | *((int *) buf) = inst1; | |
1995 | target_write_memory (pcoqh, buf, 4); | |
1996 | error ("Couldn't modify space queue\n"); | |
1997 | } | |
1998 | ||
1999 | write_register (1, pc); | |
2000 | ||
2001 | /* Single step twice, the BVE instruction will set the space queue | |
2002 | such that it points to the PC value written immediately above | |
2003 | (ie the call dummy). */ | |
2004 | resume (1, 0); | |
2005 | target_wait (inferior_pid, &w); | |
2006 | resume (1, 0); | |
2007 | target_wait (inferior_pid, &w); | |
2008 | ||
2009 | /* Restore the two instructions at the old PC locations. */ | |
2010 | *((int *) buf) = inst1; | |
2011 | target_write_memory (pcoqh, buf, 4); | |
2012 | *((int *) buf) = inst2; | |
2013 | target_write_memory (pcoqt, buf, 4); | |
2014 | } | |
2015 | ||
2016 | /* The call dummy wants the ultimate destination address initially | |
2017 | in register %r5. */ | |
2018 | write_register (5, fun); | |
2019 | ||
2020 | /* We need to see if this objfile has a different DP value than our | |
2021 | own (it could be a shared library for example. */ | |
2022 | ALL_OBJFILES (objfile) | |
2023 | { | |
2024 | struct obj_section *s; | |
2025 | obj_private_data_t *obj_private; | |
2026 | ||
2027 | /* See if FUN is in any section within this shared library. */ | |
2028 | for (s = objfile->sections; s < objfile->sections_end; s++) | |
2029 | if (s->addr <= fun && fun < s->endaddr) | |
2030 | break; | |
2031 | ||
2032 | if (s >= objfile->sections_end) | |
2033 | continue; | |
2034 | ||
2035 | obj_private = (obj_private_data_t *) objfile->obj_private; | |
2036 | ||
2037 | /* The DP value may be different for each objfile. But within an | |
2038 | objfile each function uses the same dp value. Thus we do not need | |
2039 | to grope around the opd section looking for dp values. | |
2040 | ||
2041 | ?!? This is not strictly correct since we may be in a shared library | |
2042 | and want to call back into the main program. To make that case | |
2043 | work correctly we need to set obj_private->dp for the main program's | |
2044 | objfile, then remove this conditional. */ | |
2045 | if (obj_private->dp) | |
2046 | write_register (27, obj_private->dp); | |
2047 | break; | |
2048 | } | |
2049 | return pc; | |
2050 | } | |
2051 | #endif | |
2052 | ||
2053 | #ifndef GDB_TARGET_IS_HPPA_20W | |
cce74817 | 2054 | /* Prefer __gcc_plt_call over the HP supplied routine because |
c5aa993b | 2055 | __gcc_plt_call works for any number of arguments. */ |
c906108c | 2056 | trampoline = NULL; |
cce74817 JM |
2057 | if (lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL) == NULL) |
2058 | using_gcc_plt_call = 0; | |
2059 | ||
c906108c SS |
2060 | msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL); |
2061 | if (msymbol == NULL) | |
cce74817 | 2062 | error ("Can't find an address for $$dyncall trampoline"); |
c906108c SS |
2063 | |
2064 | dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
2065 | ||
2066 | /* FUN could be a procedure label, in which case we have to get | |
cce74817 JM |
2067 | its real address and the value of its GOT/DP if we plan to |
2068 | call the routine via gcc_plt_call. */ | |
2069 | if ((fun & 0x2) && using_gcc_plt_call) | |
c906108c SS |
2070 | { |
2071 | /* Get the GOT/DP value for the target function. It's | |
c5aa993b JM |
2072 | at *(fun+4). Note the call dummy is *NOT* allowed to |
2073 | trash %r19 before calling the target function. */ | |
53a5351d JM |
2074 | write_register (19, read_memory_integer ((fun & ~0x3) + 4, |
2075 | REGISTER_SIZE)); | |
c906108c SS |
2076 | |
2077 | /* Now get the real address for the function we are calling, it's | |
c5aa993b | 2078 | at *fun. */ |
53a5351d JM |
2079 | fun = (CORE_ADDR) read_memory_integer (fun & ~0x3, |
2080 | TARGET_PTR_BIT / 8); | |
c906108c SS |
2081 | } |
2082 | else | |
2083 | { | |
2084 | ||
2085 | #ifndef GDB_TARGET_IS_PA_ELF | |
cce74817 | 2086 | /* FUN could be an export stub, the real address of a function, or |
c5aa993b JM |
2087 | a PLABEL. When using gcc's PLT call routine we must call an import |
2088 | stub rather than the export stub or real function for lazy binding | |
2089 | to work correctly | |
cce74817 | 2090 | |
c5aa993b JM |
2091 | /* If we are using the gcc PLT call routine, then we need to |
2092 | get the import stub for the target function. */ | |
cce74817 | 2093 | if (using_gcc_plt_call && som_solib_get_got_by_pc (fun)) |
c906108c SS |
2094 | { |
2095 | struct objfile *objfile; | |
2096 | struct minimal_symbol *funsymbol, *stub_symbol; | |
2097 | CORE_ADDR newfun = 0; | |
2098 | ||
2099 | funsymbol = lookup_minimal_symbol_by_pc (fun); | |
2100 | if (!funsymbol) | |
2101 | error ("Unable to find minimal symbol for target fucntion.\n"); | |
2102 | ||
2103 | /* Search all the object files for an import symbol with the | |
2104 | right name. */ | |
2105 | ALL_OBJFILES (objfile) | |
c5aa993b JM |
2106 | { |
2107 | stub_symbol | |
2108 | = lookup_minimal_symbol_solib_trampoline | |
2109 | (SYMBOL_NAME (funsymbol), NULL, objfile); | |
2110 | ||
2111 | if (!stub_symbol) | |
2112 | stub_symbol = lookup_minimal_symbol (SYMBOL_NAME (funsymbol), | |
2113 | NULL, objfile); | |
2114 | ||
2115 | /* Found a symbol with the right name. */ | |
2116 | if (stub_symbol) | |
2117 | { | |
2118 | struct unwind_table_entry *u; | |
2119 | /* It must be a shared library trampoline. */ | |
2120 | if (MSYMBOL_TYPE (stub_symbol) != mst_solib_trampoline) | |
2121 | continue; | |
2122 | ||
2123 | /* It must also be an import stub. */ | |
2124 | u = find_unwind_entry (SYMBOL_VALUE (stub_symbol)); | |
2125 | if (!u | |
2126 | || (u->stub_unwind.stub_type != IMPORT) | |
2127 | && u->stub_unwind.stub_type != IMPORT_SHLIB) | |
2128 | continue; | |
2129 | ||
2130 | /* OK. Looks like the correct import stub. */ | |
2131 | newfun = SYMBOL_VALUE (stub_symbol); | |
2132 | fun = newfun; | |
2133 | } | |
2134 | } | |
cce74817 JM |
2135 | |
2136 | /* Ouch. We did not find an import stub. Make an attempt to | |
2137 | do the right thing instead of just croaking. Most of the | |
2138 | time this will actually work. */ | |
c906108c SS |
2139 | if (newfun == 0) |
2140 | write_register (19, som_solib_get_got_by_pc (fun)); | |
cce74817 JM |
2141 | |
2142 | u = find_unwind_entry (fun); | |
c5aa993b | 2143 | if (u |
cce74817 JM |
2144 | && (u->stub_unwind.stub_type == IMPORT |
2145 | || u->stub_unwind.stub_type == IMPORT_SHLIB)) | |
2146 | trampoline = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL); | |
2147 | ||
2148 | /* If we found the import stub in the shared library, then we have | |
2149 | to set %r19 before we call the stub. */ | |
2150 | if (u && u->stub_unwind.stub_type == IMPORT_SHLIB) | |
2151 | write_register (19, som_solib_get_got_by_pc (fun)); | |
c906108c | 2152 | } |
c906108c SS |
2153 | #endif |
2154 | } | |
2155 | ||
cce74817 JM |
2156 | /* If we are calling into another load module then have sr4export call the |
2157 | magic __d_plt_call routine which is linked in from end.o. | |
c906108c | 2158 | |
cce74817 JM |
2159 | You can't use _sr4export to make the call as the value in sp-24 will get |
2160 | fried and you end up returning to the wrong location. You can't call the | |
2161 | target as the code to bind the PLT entry to a function can't return to a | |
2162 | stack address. | |
2163 | ||
2164 | Also, query the dynamic linker in the inferior to provide a suitable | |
2165 | PLABEL for the target function. */ | |
c5aa993b | 2166 | if (!using_gcc_plt_call) |
c906108c SS |
2167 | { |
2168 | CORE_ADDR new_fun; | |
2169 | ||
cce74817 | 2170 | /* Get a handle for the shared library containing FUN. Given the |
c5aa993b | 2171 | handle we can query the shared library for a PLABEL. */ |
cce74817 | 2172 | solib_handle = som_solib_get_solib_by_pc (fun); |
c906108c | 2173 | |
cce74817 | 2174 | if (solib_handle) |
c906108c | 2175 | { |
cce74817 | 2176 | struct minimal_symbol *fmsymbol = lookup_minimal_symbol_by_pc (fun); |
c906108c | 2177 | |
cce74817 JM |
2178 | trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL); |
2179 | ||
2180 | if (trampoline == NULL) | |
2181 | { | |
2182 | error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc."); | |
2183 | } | |
2184 | ||
2185 | /* This is where sr4export will jump to. */ | |
2186 | new_fun = SYMBOL_VALUE_ADDRESS (trampoline); | |
2187 | ||
2188 | /* If the function is in a shared library, then call __d_shl_get to | |
2189 | get a PLABEL for the target function. */ | |
2190 | new_stub = find_stub_with_shl_get (fmsymbol, solib_handle); | |
2191 | ||
c5aa993b | 2192 | if (new_stub == 0) |
cce74817 | 2193 | error ("Can't find an import stub for %s", SYMBOL_NAME (fmsymbol)); |
c906108c SS |
2194 | |
2195 | /* We have to store the address of the stub in __shlib_funcptr. */ | |
cce74817 | 2196 | msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL, |
c5aa993b | 2197 | (struct objfile *) NULL); |
c906108c | 2198 | |
cce74817 JM |
2199 | if (msymbol == NULL) |
2200 | error ("Can't find an address for __shlib_funcptr"); | |
2201 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
c5aa993b | 2202 | (char *) &new_stub, 4); |
c906108c SS |
2203 | |
2204 | /* We want sr4export to call __d_plt_call, so we claim it is | |
2205 | the final target. Clear trampoline. */ | |
cce74817 JM |
2206 | fun = new_fun; |
2207 | trampoline = NULL; | |
c906108c SS |
2208 | } |
2209 | } | |
2210 | ||
2211 | /* Store upper 21 bits of function address into ldil. fun will either be | |
2212 | the final target (most cases) or __d_plt_call when calling into a shared | |
2213 | library and __gcc_plt_call is not available. */ | |
2214 | store_unsigned_integer | |
2215 | (&dummy[FUNC_LDIL_OFFSET], | |
2216 | INSTRUCTION_SIZE, | |
2217 | deposit_21 (fun >> 11, | |
2218 | extract_unsigned_integer (&dummy[FUNC_LDIL_OFFSET], | |
2219 | INSTRUCTION_SIZE))); | |
2220 | ||
2221 | /* Store lower 11 bits of function address into ldo */ | |
2222 | store_unsigned_integer | |
2223 | (&dummy[FUNC_LDO_OFFSET], | |
2224 | INSTRUCTION_SIZE, | |
2225 | deposit_14 (fun & MASK_11, | |
2226 | extract_unsigned_integer (&dummy[FUNC_LDO_OFFSET], | |
2227 | INSTRUCTION_SIZE))); | |
2228 | #ifdef SR4EXPORT_LDIL_OFFSET | |
2229 | ||
2230 | { | |
2231 | CORE_ADDR trampoline_addr; | |
2232 | ||
2233 | /* We may still need sr4export's address too. */ | |
2234 | ||
2235 | if (trampoline == NULL) | |
2236 | { | |
2237 | msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2238 | if (msymbol == NULL) | |
cce74817 | 2239 | error ("Can't find an address for _sr4export trampoline"); |
c906108c SS |
2240 | |
2241 | trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
2242 | } | |
2243 | else | |
2244 | trampoline_addr = SYMBOL_VALUE_ADDRESS (trampoline); | |
2245 | ||
2246 | ||
2247 | /* Store upper 21 bits of trampoline's address into ldil */ | |
2248 | store_unsigned_integer | |
2249 | (&dummy[SR4EXPORT_LDIL_OFFSET], | |
2250 | INSTRUCTION_SIZE, | |
2251 | deposit_21 (trampoline_addr >> 11, | |
2252 | extract_unsigned_integer (&dummy[SR4EXPORT_LDIL_OFFSET], | |
2253 | INSTRUCTION_SIZE))); | |
2254 | ||
2255 | /* Store lower 11 bits of trampoline's address into ldo */ | |
2256 | store_unsigned_integer | |
2257 | (&dummy[SR4EXPORT_LDO_OFFSET], | |
2258 | INSTRUCTION_SIZE, | |
2259 | deposit_14 (trampoline_addr & MASK_11, | |
2260 | extract_unsigned_integer (&dummy[SR4EXPORT_LDO_OFFSET], | |
2261 | INSTRUCTION_SIZE))); | |
2262 | } | |
2263 | #endif | |
2264 | ||
2265 | write_register (22, pc); | |
2266 | ||
2267 | /* If we are in a syscall, then we should call the stack dummy | |
2268 | directly. $$dyncall is not needed as the kernel sets up the | |
2269 | space id registers properly based on the value in %r31. In | |
2270 | fact calling $$dyncall will not work because the value in %r22 | |
2271 | will be clobbered on the syscall exit path. | |
2272 | ||
2273 | Similarly if the current PC is in a shared library. Note however, | |
2274 | this scheme won't work if the shared library isn't mapped into | |
2275 | the same space as the stack. */ | |
2276 | if (flags & 2) | |
2277 | return pc; | |
2278 | #ifndef GDB_TARGET_IS_PA_ELF | |
2279 | else if (som_solib_get_got_by_pc (target_read_pc (inferior_pid))) | |
2280 | return pc; | |
2281 | #endif | |
2282 | else | |
2283 | return dyncall_addr; | |
53a5351d | 2284 | #endif |
c906108c SS |
2285 | } |
2286 | ||
2287 | ||
2288 | ||
2289 | ||
2290 | /* If the pid is in a syscall, then the FP register is not readable. | |
2291 | We'll return zero in that case, rather than attempting to read it | |
2292 | and cause a warning. */ | |
2293 | CORE_ADDR | |
2294 | target_read_fp (pid) | |
c5aa993b | 2295 | int pid; |
c906108c SS |
2296 | { |
2297 | int flags = read_register (FLAGS_REGNUM); | |
2298 | ||
c5aa993b JM |
2299 | if (flags & 2) |
2300 | { | |
2301 | return (CORE_ADDR) 0; | |
2302 | } | |
c906108c SS |
2303 | |
2304 | /* This is the only site that may directly read_register () the FP | |
2305 | register. All others must use TARGET_READ_FP (). */ | |
2306 | return read_register (FP_REGNUM); | |
2307 | } | |
2308 | ||
2309 | ||
2310 | /* Get the PC from %r31 if currently in a syscall. Also mask out privilege | |
2311 | bits. */ | |
2312 | ||
2313 | CORE_ADDR | |
2314 | target_read_pc (pid) | |
2315 | int pid; | |
2316 | { | |
2317 | int flags = read_register_pid (FLAGS_REGNUM, pid); | |
2318 | ||
2319 | /* The following test does not belong here. It is OS-specific, and belongs | |
2320 | in native code. */ | |
2321 | /* Test SS_INSYSCALL */ | |
2322 | if (flags & 2) | |
2323 | return read_register_pid (31, pid) & ~0x3; | |
2324 | ||
2325 | return read_register_pid (PC_REGNUM, pid) & ~0x3; | |
2326 | } | |
2327 | ||
2328 | /* Write out the PC. If currently in a syscall, then also write the new | |
2329 | PC value into %r31. */ | |
2330 | ||
2331 | void | |
2332 | target_write_pc (v, pid) | |
2333 | CORE_ADDR v; | |
2334 | int pid; | |
2335 | { | |
2336 | int flags = read_register_pid (FLAGS_REGNUM, pid); | |
2337 | ||
2338 | /* The following test does not belong here. It is OS-specific, and belongs | |
2339 | in native code. */ | |
2340 | /* If in a syscall, then set %r31. Also make sure to get the | |
2341 | privilege bits set correctly. */ | |
2342 | /* Test SS_INSYSCALL */ | |
2343 | if (flags & 2) | |
2344 | write_register_pid (31, v | 0x3, pid); | |
2345 | ||
2346 | write_register_pid (PC_REGNUM, v, pid); | |
2347 | write_register_pid (NPC_REGNUM, v + 4, pid); | |
2348 | } | |
2349 | ||
2350 | /* return the alignment of a type in bytes. Structures have the maximum | |
2351 | alignment required by their fields. */ | |
2352 | ||
2353 | static int | |
2354 | hppa_alignof (type) | |
2355 | struct type *type; | |
2356 | { | |
2357 | int max_align, align, i; | |
2358 | CHECK_TYPEDEF (type); | |
2359 | switch (TYPE_CODE (type)) | |
2360 | { | |
2361 | case TYPE_CODE_PTR: | |
2362 | case TYPE_CODE_INT: | |
2363 | case TYPE_CODE_FLT: | |
2364 | return TYPE_LENGTH (type); | |
2365 | case TYPE_CODE_ARRAY: | |
2366 | return hppa_alignof (TYPE_FIELD_TYPE (type, 0)); | |
2367 | case TYPE_CODE_STRUCT: | |
2368 | case TYPE_CODE_UNION: | |
2369 | max_align = 1; | |
2370 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
2371 | { | |
2372 | /* Bit fields have no real alignment. */ | |
2373 | /* if (!TYPE_FIELD_BITPOS (type, i)) */ | |
c5aa993b | 2374 | if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */ |
c906108c SS |
2375 | { |
2376 | align = hppa_alignof (TYPE_FIELD_TYPE (type, i)); | |
2377 | max_align = max (max_align, align); | |
2378 | } | |
2379 | } | |
2380 | return max_align; | |
2381 | default: | |
2382 | return 4; | |
2383 | } | |
2384 | } | |
2385 | ||
2386 | /* Print the register regnum, or all registers if regnum is -1 */ | |
2387 | ||
2388 | void | |
2389 | pa_do_registers_info (regnum, fpregs) | |
2390 | int regnum; | |
2391 | int fpregs; | |
2392 | { | |
c5aa993b | 2393 | char raw_regs[REGISTER_BYTES]; |
c906108c SS |
2394 | int i; |
2395 | ||
2396 | /* Make a copy of gdb's save area (may cause actual | |
2397 | reads from the target). */ | |
2398 | for (i = 0; i < NUM_REGS; i++) | |
2399 | read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); | |
2400 | ||
2401 | if (regnum == -1) | |
2402 | pa_print_registers (raw_regs, regnum, fpregs); | |
c5aa993b JM |
2403 | else if (regnum < FP4_REGNUM) |
2404 | { | |
2405 | long reg_val[2]; | |
2406 | ||
2407 | /* Why is the value not passed through "extract_signed_integer" | |
2408 | as in "pa_print_registers" below? */ | |
2409 | pa_register_look_aside (raw_regs, regnum, ®_val[0]); | |
2410 | ||
2411 | if (!is_pa_2) | |
2412 | { | |
2413 | printf_unfiltered ("%s %x\n", REGISTER_NAME (regnum), reg_val[1]); | |
2414 | } | |
c906108c | 2415 | else |
c5aa993b JM |
2416 | { |
2417 | /* Fancy % formats to prevent leading zeros. */ | |
2418 | if (reg_val[0] == 0) | |
2419 | printf_unfiltered ("%s %x\n", REGISTER_NAME (regnum), reg_val[1]); | |
2420 | else | |
2421 | printf_unfiltered ("%s %x%8.8x\n", REGISTER_NAME (regnum), | |
2422 | reg_val[0], reg_val[1]); | |
2423 | } | |
c906108c | 2424 | } |
c906108c | 2425 | else |
c5aa993b JM |
2426 | /* Note that real floating point values only start at |
2427 | FP4_REGNUM. FP0 and up are just status and error | |
2428 | registers, which have integral (bit) values. */ | |
c906108c SS |
2429 | pa_print_fp_reg (regnum); |
2430 | } | |
2431 | ||
2432 | /********** new function ********************/ | |
2433 | void | |
2434 | pa_do_strcat_registers_info (regnum, fpregs, stream, precision) | |
2435 | int regnum; | |
2436 | int fpregs; | |
2437 | GDB_FILE *stream; | |
2438 | enum precision_type precision; | |
2439 | { | |
c5aa993b | 2440 | char raw_regs[REGISTER_BYTES]; |
c906108c SS |
2441 | int i; |
2442 | ||
2443 | /* Make a copy of gdb's save area (may cause actual | |
c5aa993b | 2444 | reads from the target). */ |
c906108c SS |
2445 | for (i = 0; i < NUM_REGS; i++) |
2446 | read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); | |
2447 | ||
2448 | if (regnum == -1) | |
2449 | pa_strcat_registers (raw_regs, regnum, fpregs, stream); | |
2450 | ||
c5aa993b JM |
2451 | else if (regnum < FP4_REGNUM) |
2452 | { | |
2453 | long reg_val[2]; | |
2454 | ||
2455 | /* Why is the value not passed through "extract_signed_integer" | |
2456 | as in "pa_print_registers" below? */ | |
2457 | pa_register_look_aside (raw_regs, regnum, ®_val[0]); | |
c906108c | 2458 | |
c5aa993b JM |
2459 | if (!is_pa_2) |
2460 | { | |
2461 | fprintf_unfiltered (stream, "%s %x", REGISTER_NAME (regnum), reg_val[1]); | |
2462 | } | |
c906108c | 2463 | else |
c5aa993b JM |
2464 | { |
2465 | /* Fancy % formats to prevent leading zeros. */ | |
2466 | if (reg_val[0] == 0) | |
2467 | fprintf_unfiltered (stream, "%s %x", REGISTER_NAME (regnum), | |
2468 | reg_val[1]); | |
2469 | else | |
2470 | fprintf_unfiltered (stream, "%s %x%8.8x", REGISTER_NAME (regnum), | |
2471 | reg_val[0], reg_val[1]); | |
2472 | } | |
c906108c | 2473 | } |
c906108c | 2474 | else |
c5aa993b JM |
2475 | /* Note that real floating point values only start at |
2476 | FP4_REGNUM. FP0 and up are just status and error | |
2477 | registers, which have integral (bit) values. */ | |
c906108c SS |
2478 | pa_strcat_fp_reg (regnum, stream, precision); |
2479 | } | |
2480 | ||
2481 | /* If this is a PA2.0 machine, fetch the real 64-bit register | |
2482 | value. Otherwise use the info from gdb's saved register area. | |
2483 | ||
2484 | Note that reg_val is really expected to be an array of longs, | |
2485 | with two elements. */ | |
2486 | static void | |
c5aa993b | 2487 | pa_register_look_aside (raw_regs, regnum, raw_val) |
c906108c | 2488 | char *raw_regs; |
c5aa993b | 2489 | int regnum; |
c906108c SS |
2490 | long *raw_val; |
2491 | { | |
c5aa993b | 2492 | static int know_which = 0; /* False */ |
c906108c | 2493 | |
c5aa993b | 2494 | int regaddr; |
c906108c SS |
2495 | unsigned int offset; |
2496 | register int i; | |
c5aa993b JM |
2497 | int start; |
2498 | ||
2499 | ||
c906108c SS |
2500 | char buf[MAX_REGISTER_RAW_SIZE]; |
2501 | long long reg_val; | |
2502 | ||
c5aa993b JM |
2503 | if (!know_which) |
2504 | { | |
2505 | if (CPU_PA_RISC2_0 == sysconf (_SC_CPU_VERSION)) | |
2506 | { | |
2507 | is_pa_2 = (1 == 1); | |
2508 | } | |
2509 | ||
2510 | know_which = 1; /* True */ | |
2511 | } | |
c906108c SS |
2512 | |
2513 | raw_val[0] = 0; | |
2514 | raw_val[1] = 0; | |
2515 | ||
c5aa993b JM |
2516 | if (!is_pa_2) |
2517 | { | |
2518 | raw_val[1] = *(long *) (raw_regs + REGISTER_BYTE (regnum)); | |
c906108c | 2519 | return; |
c5aa993b | 2520 | } |
c906108c SS |
2521 | |
2522 | /* Code below copied from hppah-nat.c, with fixes for wide | |
2523 | registers, using different area of save_state, etc. */ | |
2524 | if (regnum == FLAGS_REGNUM || regnum >= FP0_REGNUM || | |
c5aa993b JM |
2525 | !HAVE_STRUCT_SAVE_STATE_T || !HAVE_STRUCT_MEMBER_SS_WIDE) |
2526 | { | |
c906108c | 2527 | /* Use narrow regs area of save_state and default macro. */ |
c5aa993b JM |
2528 | offset = U_REGS_OFFSET; |
2529 | regaddr = register_addr (regnum, offset); | |
2530 | start = 1; | |
2531 | } | |
2532 | else | |
2533 | { | |
c906108c SS |
2534 | /* Use wide regs area, and calculate registers as 8 bytes wide. |
2535 | ||
2536 | We'd like to do this, but current version of "C" doesn't | |
2537 | permit "offsetof": | |
2538 | ||
c5aa993b | 2539 | offset = offsetof(save_state_t, ss_wide); |
c906108c SS |
2540 | |
2541 | Note that to avoid "C" doing typed pointer arithmetic, we | |
2542 | have to cast away the type in our offset calculation: | |
2543 | otherwise we get an offset of 1! */ | |
2544 | ||
7a292a7a | 2545 | /* NB: save_state_t is not available before HPUX 9. |
c5aa993b | 2546 | The ss_wide field is not available previous to HPUX 10.20, |
7a292a7a SS |
2547 | so to avoid compile-time warnings, we only compile this for |
2548 | PA 2.0 processors. This control path should only be followed | |
2549 | if we're debugging a PA 2.0 processor, so this should not cause | |
2550 | problems. */ | |
2551 | ||
c906108c SS |
2552 | /* #if the following code out so that this file can still be |
2553 | compiled on older HPUX boxes (< 10.20) which don't have | |
2554 | this structure/structure member. */ | |
2555 | #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1 | |
2556 | save_state_t temp; | |
2557 | ||
2558 | offset = ((int) &temp.ss_wide) - ((int) &temp); | |
2559 | regaddr = offset + regnum * 8; | |
c5aa993b | 2560 | start = 0; |
c906108c | 2561 | #endif |
c5aa993b JM |
2562 | } |
2563 | ||
2564 | for (i = start; i < 2; i++) | |
c906108c SS |
2565 | { |
2566 | errno = 0; | |
2567 | raw_val[i] = call_ptrace (PT_RUREGS, inferior_pid, | |
c5aa993b | 2568 | (PTRACE_ARG3_TYPE) regaddr, 0); |
c906108c SS |
2569 | if (errno != 0) |
2570 | { | |
2571 | /* Warning, not error, in case we are attached; sometimes the | |
2572 | kernel doesn't let us at the registers. */ | |
2573 | char *err = safe_strerror (errno); | |
2574 | char *msg = alloca (strlen (err) + 128); | |
2575 | sprintf (msg, "reading register %s: %s", REGISTER_NAME (regnum), err); | |
2576 | warning (msg); | |
2577 | goto error_exit; | |
2578 | } | |
2579 | ||
2580 | regaddr += sizeof (long); | |
2581 | } | |
c5aa993b | 2582 | |
c906108c | 2583 | if (regnum == PCOQ_HEAD_REGNUM || regnum == PCOQ_TAIL_REGNUM) |
c5aa993b | 2584 | raw_val[1] &= ~0x3; /* I think we're masking out space bits */ |
c906108c SS |
2585 | |
2586 | error_exit: | |
2587 | ; | |
2588 | } | |
2589 | ||
2590 | /* "Info all-reg" command */ | |
c5aa993b | 2591 | |
c906108c SS |
2592 | static void |
2593 | pa_print_registers (raw_regs, regnum, fpregs) | |
2594 | char *raw_regs; | |
2595 | int regnum; | |
2596 | int fpregs; | |
2597 | { | |
c5aa993b | 2598 | int i, j; |
adf40b2e JM |
2599 | /* Alas, we are compiled so that "long long" is 32 bits */ |
2600 | long raw_val[2]; | |
c906108c | 2601 | long long_val; |
a0b3c4fd | 2602 | int rows = 48, columns = 2; |
c906108c | 2603 | |
adf40b2e | 2604 | for (i = 0; i < rows; i++) |
c906108c | 2605 | { |
adf40b2e | 2606 | for (j = 0; j < columns; j++) |
c906108c | 2607 | { |
adf40b2e JM |
2608 | /* We display registers in column-major order. */ |
2609 | int regnum = i + j * rows; | |
2610 | ||
c5aa993b JM |
2611 | /* Q: Why is the value passed through "extract_signed_integer", |
2612 | while above, in "pa_do_registers_info" it isn't? | |
2613 | A: ? */ | |
adf40b2e | 2614 | pa_register_look_aside (raw_regs, regnum, &raw_val[0]); |
c5aa993b JM |
2615 | |
2616 | /* Even fancier % formats to prevent leading zeros | |
2617 | and still maintain the output in columns. */ | |
2618 | if (!is_pa_2) | |
2619 | { | |
2620 | /* Being big-endian, on this machine the low bits | |
2621 | (the ones we want to look at) are in the second longword. */ | |
2622 | long_val = extract_signed_integer (&raw_val[1], 4); | |
a0b3c4fd | 2623 | printf_filtered ("%10.10s: %8x ", |
adf40b2e | 2624 | REGISTER_NAME (regnum), long_val); |
c5aa993b JM |
2625 | } |
2626 | else | |
2627 | { | |
2628 | /* raw_val = extract_signed_integer(&raw_val, 8); */ | |
2629 | if (raw_val[0] == 0) | |
a0b3c4fd | 2630 | printf_filtered ("%10.10s: %8x ", |
adf40b2e | 2631 | REGISTER_NAME (regnum), raw_val[1]); |
c5aa993b | 2632 | else |
a0b3c4fd JM |
2633 | printf_filtered ("%10.10s: %8x%8.8x ", |
2634 | REGISTER_NAME (regnum), | |
c5aa993b JM |
2635 | raw_val[0], raw_val[1]); |
2636 | } | |
c906108c SS |
2637 | } |
2638 | printf_unfiltered ("\n"); | |
2639 | } | |
c5aa993b | 2640 | |
c906108c | 2641 | if (fpregs) |
c5aa993b | 2642 | for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ |
c906108c SS |
2643 | pa_print_fp_reg (i); |
2644 | } | |
2645 | ||
c5aa993b | 2646 | /************* new function ******************/ |
c906108c SS |
2647 | static void |
2648 | pa_strcat_registers (raw_regs, regnum, fpregs, stream) | |
2649 | char *raw_regs; | |
2650 | int regnum; | |
2651 | int fpregs; | |
2652 | GDB_FILE *stream; | |
2653 | { | |
c5aa993b JM |
2654 | int i, j; |
2655 | long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */ | |
c906108c SS |
2656 | long long_val; |
2657 | enum precision_type precision; | |
2658 | ||
2659 | precision = unspecified_precision; | |
2660 | ||
2661 | for (i = 0; i < 18; i++) | |
2662 | { | |
2663 | for (j = 0; j < 4; j++) | |
2664 | { | |
c5aa993b JM |
2665 | /* Q: Why is the value passed through "extract_signed_integer", |
2666 | while above, in "pa_do_registers_info" it isn't? | |
2667 | A: ? */ | |
2668 | pa_register_look_aside (raw_regs, i + (j * 18), &raw_val[0]); | |
2669 | ||
2670 | /* Even fancier % formats to prevent leading zeros | |
2671 | and still maintain the output in columns. */ | |
2672 | if (!is_pa_2) | |
2673 | { | |
2674 | /* Being big-endian, on this machine the low bits | |
2675 | (the ones we want to look at) are in the second longword. */ | |
2676 | long_val = extract_signed_integer (&raw_val[1], 4); | |
2677 | fprintf_filtered (stream, "%8.8s: %8x ", REGISTER_NAME (i + (j * 18)), long_val); | |
2678 | } | |
2679 | else | |
2680 | { | |
2681 | /* raw_val = extract_signed_integer(&raw_val, 8); */ | |
2682 | if (raw_val[0] == 0) | |
2683 | fprintf_filtered (stream, "%8.8s: %8x ", REGISTER_NAME (i + (j * 18)), | |
2684 | raw_val[1]); | |
2685 | else | |
2686 | fprintf_filtered (stream, "%8.8s: %8x%8.8x ", REGISTER_NAME (i + (j * 18)), | |
2687 | raw_val[0], raw_val[1]); | |
2688 | } | |
c906108c SS |
2689 | } |
2690 | fprintf_unfiltered (stream, "\n"); | |
2691 | } | |
c5aa993b | 2692 | |
c906108c | 2693 | if (fpregs) |
c5aa993b | 2694 | for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ |
c906108c SS |
2695 | pa_strcat_fp_reg (i, stream, precision); |
2696 | } | |
2697 | ||
2698 | static void | |
2699 | pa_print_fp_reg (i) | |
2700 | int i; | |
2701 | { | |
2702 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
2703 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
2704 | ||
2705 | /* Get 32bits of data. */ | |
2706 | read_relative_register_raw_bytes (i, raw_buffer); | |
2707 | ||
2708 | /* Put it in the buffer. No conversions are ever necessary. */ | |
2709 | memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); | |
2710 | ||
2711 | fputs_filtered (REGISTER_NAME (i), gdb_stdout); | |
2712 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout); | |
2713 | fputs_filtered ("(single precision) ", gdb_stdout); | |
2714 | ||
2715 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, gdb_stdout, 0, | |
2716 | 1, 0, Val_pretty_default); | |
2717 | printf_filtered ("\n"); | |
2718 | ||
2719 | /* If "i" is even, then this register can also be a double-precision | |
2720 | FP register. Dump it out as such. */ | |
2721 | if ((i % 2) == 0) | |
2722 | { | |
2723 | /* Get the data in raw format for the 2nd half. */ | |
2724 | read_relative_register_raw_bytes (i + 1, raw_buffer); | |
2725 | ||
2726 | /* Copy it into the appropriate part of the virtual buffer. */ | |
2727 | memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buffer, | |
2728 | REGISTER_RAW_SIZE (i)); | |
2729 | ||
2730 | /* Dump it as a double. */ | |
2731 | fputs_filtered (REGISTER_NAME (i), gdb_stdout); | |
2732 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout); | |
2733 | fputs_filtered ("(double precision) ", gdb_stdout); | |
2734 | ||
2735 | val_print (builtin_type_double, virtual_buffer, 0, 0, gdb_stdout, 0, | |
2736 | 1, 0, Val_pretty_default); | |
2737 | printf_filtered ("\n"); | |
2738 | } | |
2739 | } | |
2740 | ||
2741 | /*************** new function ***********************/ | |
2742 | static void | |
2743 | pa_strcat_fp_reg (i, stream, precision) | |
2744 | int i; | |
2745 | GDB_FILE *stream; | |
2746 | enum precision_type precision; | |
2747 | { | |
2748 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
2749 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
2750 | ||
2751 | fputs_filtered (REGISTER_NAME (i), stream); | |
2752 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), stream); | |
2753 | ||
2754 | /* Get 32bits of data. */ | |
2755 | read_relative_register_raw_bytes (i, raw_buffer); | |
2756 | ||
2757 | /* Put it in the buffer. No conversions are ever necessary. */ | |
2758 | memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); | |
2759 | ||
2760 | if (precision == double_precision && (i % 2) == 0) | |
2761 | { | |
2762 | ||
c5aa993b JM |
2763 | char raw_buf[MAX_REGISTER_RAW_SIZE]; |
2764 | ||
2765 | /* Get the data in raw format for the 2nd half. */ | |
2766 | read_relative_register_raw_bytes (i + 1, raw_buf); | |
2767 | ||
2768 | /* Copy it into the appropriate part of the virtual buffer. */ | |
2769 | memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buf, REGISTER_RAW_SIZE (i)); | |
c906108c | 2770 | |
c5aa993b JM |
2771 | val_print (builtin_type_double, virtual_buffer, 0, 0, stream, 0, |
2772 | 1, 0, Val_pretty_default); | |
c906108c SS |
2773 | |
2774 | } | |
c5aa993b JM |
2775 | else |
2776 | { | |
2777 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, stream, 0, | |
2778 | 1, 0, Val_pretty_default); | |
2779 | } | |
c906108c SS |
2780 | |
2781 | } | |
2782 | ||
2783 | /* Return one if PC is in the call path of a trampoline, else return zero. | |
2784 | ||
2785 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
2786 | just shared library trampolines (import, export). */ | |
2787 | ||
2788 | int | |
2789 | in_solib_call_trampoline (pc, name) | |
2790 | CORE_ADDR pc; | |
2791 | char *name; | |
2792 | { | |
2793 | struct minimal_symbol *minsym; | |
2794 | struct unwind_table_entry *u; | |
2795 | static CORE_ADDR dyncall = 0; | |
2796 | static CORE_ADDR sr4export = 0; | |
2797 | ||
2798 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a | |
2799 | new exec file */ | |
2800 | ||
2801 | /* First see if PC is in one of the two C-library trampolines. */ | |
2802 | if (!dyncall) | |
2803 | { | |
2804 | minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
2805 | if (minsym) | |
2806 | dyncall = SYMBOL_VALUE_ADDRESS (minsym); | |
2807 | else | |
2808 | dyncall = -1; | |
2809 | } | |
2810 | ||
2811 | if (!sr4export) | |
2812 | { | |
2813 | minsym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2814 | if (minsym) | |
2815 | sr4export = SYMBOL_VALUE_ADDRESS (minsym); | |
2816 | else | |
2817 | sr4export = -1; | |
2818 | } | |
2819 | ||
2820 | if (pc == dyncall || pc == sr4export) | |
2821 | return 1; | |
2822 | ||
2823 | /* Get the unwind descriptor corresponding to PC, return zero | |
2824 | if no unwind was found. */ | |
2825 | u = find_unwind_entry (pc); | |
2826 | if (!u) | |
2827 | return 0; | |
2828 | ||
2829 | /* If this isn't a linker stub, then return now. */ | |
2830 | if (u->stub_unwind.stub_type == 0) | |
2831 | return 0; | |
2832 | ||
2833 | /* By definition a long-branch stub is a call stub. */ | |
2834 | if (u->stub_unwind.stub_type == LONG_BRANCH) | |
2835 | return 1; | |
2836 | ||
2837 | /* The call and return path execute the same instructions within | |
2838 | an IMPORT stub! So an IMPORT stub is both a call and return | |
2839 | trampoline. */ | |
2840 | if (u->stub_unwind.stub_type == IMPORT) | |
2841 | return 1; | |
2842 | ||
2843 | /* Parameter relocation stubs always have a call path and may have a | |
2844 | return path. */ | |
2845 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
2846 | || u->stub_unwind.stub_type == EXPORT) | |
2847 | { | |
2848 | CORE_ADDR addr; | |
2849 | ||
2850 | /* Search forward from the current PC until we hit a branch | |
c5aa993b | 2851 | or the end of the stub. */ |
c906108c SS |
2852 | for (addr = pc; addr <= u->region_end; addr += 4) |
2853 | { | |
2854 | unsigned long insn; | |
2855 | ||
2856 | insn = read_memory_integer (addr, 4); | |
2857 | ||
2858 | /* Does it look like a bl? If so then it's the call path, if | |
2859 | we find a bv or be first, then we're on the return path. */ | |
2860 | if ((insn & 0xfc00e000) == 0xe8000000) | |
2861 | return 1; | |
2862 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
2863 | || (insn & 0xfc000000) == 0xe0000000) | |
2864 | return 0; | |
2865 | } | |
2866 | ||
2867 | /* Should never happen. */ | |
c5aa993b JM |
2868 | warning ("Unable to find branch in parameter relocation stub.\n"); /* purecov: deadcode */ |
2869 | return 0; /* purecov: deadcode */ | |
c906108c SS |
2870 | } |
2871 | ||
2872 | /* Unknown stub type. For now, just return zero. */ | |
c5aa993b | 2873 | return 0; /* purecov: deadcode */ |
c906108c SS |
2874 | } |
2875 | ||
2876 | /* Return one if PC is in the return path of a trampoline, else return zero. | |
2877 | ||
2878 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
2879 | just shared library trampolines (import, export). */ | |
2880 | ||
2881 | int | |
2882 | in_solib_return_trampoline (pc, name) | |
2883 | CORE_ADDR pc; | |
2884 | char *name; | |
2885 | { | |
2886 | struct unwind_table_entry *u; | |
2887 | ||
2888 | /* Get the unwind descriptor corresponding to PC, return zero | |
2889 | if no unwind was found. */ | |
2890 | u = find_unwind_entry (pc); | |
2891 | if (!u) | |
2892 | return 0; | |
2893 | ||
2894 | /* If this isn't a linker stub or it's just a long branch stub, then | |
2895 | return zero. */ | |
2896 | if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) | |
2897 | return 0; | |
2898 | ||
2899 | /* The call and return path execute the same instructions within | |
2900 | an IMPORT stub! So an IMPORT stub is both a call and return | |
2901 | trampoline. */ | |
2902 | if (u->stub_unwind.stub_type == IMPORT) | |
2903 | return 1; | |
2904 | ||
2905 | /* Parameter relocation stubs always have a call path and may have a | |
2906 | return path. */ | |
2907 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
2908 | || u->stub_unwind.stub_type == EXPORT) | |
2909 | { | |
2910 | CORE_ADDR addr; | |
2911 | ||
2912 | /* Search forward from the current PC until we hit a branch | |
c5aa993b | 2913 | or the end of the stub. */ |
c906108c SS |
2914 | for (addr = pc; addr <= u->region_end; addr += 4) |
2915 | { | |
2916 | unsigned long insn; | |
2917 | ||
2918 | insn = read_memory_integer (addr, 4); | |
2919 | ||
2920 | /* Does it look like a bl? If so then it's the call path, if | |
2921 | we find a bv or be first, then we're on the return path. */ | |
2922 | if ((insn & 0xfc00e000) == 0xe8000000) | |
2923 | return 0; | |
2924 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
2925 | || (insn & 0xfc000000) == 0xe0000000) | |
2926 | return 1; | |
2927 | } | |
2928 | ||
2929 | /* Should never happen. */ | |
c5aa993b JM |
2930 | warning ("Unable to find branch in parameter relocation stub.\n"); /* purecov: deadcode */ |
2931 | return 0; /* purecov: deadcode */ | |
c906108c SS |
2932 | } |
2933 | ||
2934 | /* Unknown stub type. For now, just return zero. */ | |
c5aa993b | 2935 | return 0; /* purecov: deadcode */ |
c906108c SS |
2936 | |
2937 | } | |
2938 | ||
2939 | /* Figure out if PC is in a trampoline, and if so find out where | |
2940 | the trampoline will jump to. If not in a trampoline, return zero. | |
2941 | ||
2942 | Simple code examination probably is not a good idea since the code | |
2943 | sequences in trampolines can also appear in user code. | |
2944 | ||
2945 | We use unwinds and information from the minimal symbol table to | |
2946 | determine when we're in a trampoline. This won't work for ELF | |
2947 | (yet) since it doesn't create stub unwind entries. Whether or | |
2948 | not ELF will create stub unwinds or normal unwinds for linker | |
2949 | stubs is still being debated. | |
2950 | ||
2951 | This should handle simple calls through dyncall or sr4export, | |
2952 | long calls, argument relocation stubs, and dyncall/sr4export | |
2953 | calling an argument relocation stub. It even handles some stubs | |
2954 | used in dynamic executables. */ | |
2955 | ||
c906108c SS |
2956 | CORE_ADDR |
2957 | skip_trampoline_code (pc, name) | |
2958 | CORE_ADDR pc; | |
2959 | char *name; | |
2960 | { | |
2961 | long orig_pc = pc; | |
2962 | long prev_inst, curr_inst, loc; | |
2963 | static CORE_ADDR dyncall = 0; | |
2964 | static CORE_ADDR dyncall_external = 0; | |
2965 | static CORE_ADDR sr4export = 0; | |
2966 | struct minimal_symbol *msym; | |
2967 | struct unwind_table_entry *u; | |
2968 | ||
2969 | ||
2970 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a | |
2971 | new exec file */ | |
2972 | ||
2973 | if (!dyncall) | |
2974 | { | |
2975 | msym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
2976 | if (msym) | |
2977 | dyncall = SYMBOL_VALUE_ADDRESS (msym); | |
2978 | else | |
2979 | dyncall = -1; | |
2980 | } | |
2981 | ||
2982 | if (!dyncall_external) | |
2983 | { | |
2984 | msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL); | |
2985 | if (msym) | |
2986 | dyncall_external = SYMBOL_VALUE_ADDRESS (msym); | |
2987 | else | |
2988 | dyncall_external = -1; | |
2989 | } | |
2990 | ||
2991 | if (!sr4export) | |
2992 | { | |
2993 | msym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2994 | if (msym) | |
2995 | sr4export = SYMBOL_VALUE_ADDRESS (msym); | |
2996 | else | |
2997 | sr4export = -1; | |
2998 | } | |
2999 | ||
3000 | /* Addresses passed to dyncall may *NOT* be the actual address | |
3001 | of the function. So we may have to do something special. */ | |
3002 | if (pc == dyncall) | |
3003 | { | |
3004 | pc = (CORE_ADDR) read_register (22); | |
3005 | ||
3006 | /* If bit 30 (counting from the left) is on, then pc is the address of | |
c5aa993b JM |
3007 | the PLT entry for this function, not the address of the function |
3008 | itself. Bit 31 has meaning too, but only for MPE. */ | |
c906108c | 3009 | if (pc & 0x2) |
53a5351d | 3010 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); |
c906108c SS |
3011 | } |
3012 | if (pc == dyncall_external) | |
3013 | { | |
3014 | pc = (CORE_ADDR) read_register (22); | |
53a5351d | 3015 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); |
c906108c SS |
3016 | } |
3017 | else if (pc == sr4export) | |
3018 | pc = (CORE_ADDR) (read_register (22)); | |
3019 | ||
3020 | /* Get the unwind descriptor corresponding to PC, return zero | |
3021 | if no unwind was found. */ | |
3022 | u = find_unwind_entry (pc); | |
3023 | if (!u) | |
3024 | return 0; | |
3025 | ||
3026 | /* If this isn't a linker stub, then return now. */ | |
3027 | /* elz: attention here! (FIXME) because of a compiler/linker | |
3028 | error, some stubs which should have a non zero stub_unwind.stub_type | |
3029 | have unfortunately a value of zero. So this function would return here | |
3030 | as if we were not in a trampoline. To fix this, we go look at the partial | |
3031 | symbol information, which reports this guy as a stub. | |
3032 | (FIXME): Unfortunately, we are not that lucky: it turns out that the | |
3033 | partial symbol information is also wrong sometimes. This is because | |
3034 | when it is entered (somread.c::som_symtab_read()) it can happen that | |
3035 | if the type of the symbol (from the som) is Entry, and the symbol is | |
3036 | in a shared library, then it can also be a trampoline. This would | |
3037 | be OK, except that I believe the way they decide if we are ina shared library | |
3038 | does not work. SOOOO..., even if we have a regular function w/o trampolines | |
3039 | its minimal symbol can be assigned type mst_solib_trampoline. | |
3040 | Also, if we find that the symbol is a real stub, then we fix the unwind | |
3041 | descriptor, and define the stub type to be EXPORT. | |
c5aa993b | 3042 | Hopefully this is correct most of the times. */ |
c906108c | 3043 | if (u->stub_unwind.stub_type == 0) |
c5aa993b | 3044 | { |
c906108c SS |
3045 | |
3046 | /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed | |
3047 | we can delete all the code which appears between the lines */ | |
3048 | /*--------------------------------------------------------------------------*/ | |
c5aa993b | 3049 | msym = lookup_minimal_symbol_by_pc (pc); |
c906108c | 3050 | |
c5aa993b JM |
3051 | if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) |
3052 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3053 | ||
3054 | else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) | |
3055 | { | |
3056 | struct objfile *objfile; | |
3057 | struct minimal_symbol *msymbol; | |
3058 | int function_found = 0; | |
3059 | ||
3060 | /* go look if there is another minimal symbol with the same name as | |
3061 | this one, but with type mst_text. This would happen if the msym | |
3062 | is an actual trampoline, in which case there would be another | |
3063 | symbol with the same name corresponding to the real function */ | |
3064 | ||
3065 | ALL_MSYMBOLS (objfile, msymbol) | |
3066 | { | |
3067 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
3068 | && STREQ (SYMBOL_NAME (msymbol), SYMBOL_NAME (msym))) | |
3069 | { | |
3070 | function_found = 1; | |
3071 | break; | |
3072 | } | |
3073 | } | |
3074 | ||
3075 | if (function_found) | |
3076 | /* the type of msym is correct (mst_solib_trampoline), but | |
3077 | the unwind info is wrong, so set it to the correct value */ | |
3078 | u->stub_unwind.stub_type = EXPORT; | |
3079 | else | |
3080 | /* the stub type info in the unwind is correct (this is not a | |
3081 | trampoline), but the msym type information is wrong, it | |
3082 | should be mst_text. So we need to fix the msym, and also | |
3083 | get out of this function */ | |
3084 | { | |
3085 | MSYMBOL_TYPE (msym) = mst_text; | |
3086 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3087 | } | |
3088 | } | |
c906108c | 3089 | |
c906108c | 3090 | /*--------------------------------------------------------------------------*/ |
c5aa993b | 3091 | } |
c906108c SS |
3092 | |
3093 | /* It's a stub. Search for a branch and figure out where it goes. | |
3094 | Note we have to handle multi insn branch sequences like ldil;ble. | |
3095 | Most (all?) other branches can be determined by examining the contents | |
3096 | of certain registers and the stack. */ | |
3097 | ||
3098 | loc = pc; | |
3099 | curr_inst = 0; | |
3100 | prev_inst = 0; | |
3101 | while (1) | |
3102 | { | |
3103 | /* Make sure we haven't walked outside the range of this stub. */ | |
3104 | if (u != find_unwind_entry (loc)) | |
3105 | { | |
3106 | warning ("Unable to find branch in linker stub"); | |
3107 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3108 | } | |
3109 | ||
3110 | prev_inst = curr_inst; | |
3111 | curr_inst = read_memory_integer (loc, 4); | |
3112 | ||
3113 | /* Does it look like a branch external using %r1? Then it's the | |
c5aa993b | 3114 | branch from the stub to the actual function. */ |
c906108c SS |
3115 | if ((curr_inst & 0xffe0e000) == 0xe0202000) |
3116 | { | |
3117 | /* Yup. See if the previous instruction loaded | |
3118 | a value into %r1. If so compute and return the jump address. */ | |
3119 | if ((prev_inst & 0xffe00000) == 0x20200000) | |
3120 | return (extract_21 (prev_inst) + extract_17 (curr_inst)) & ~0x3; | |
3121 | else | |
3122 | { | |
3123 | warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."); | |
3124 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3125 | } | |
3126 | } | |
3127 | ||
3128 | /* Does it look like a be 0(sr0,%r21)? OR | |
3129 | Does it look like a be, n 0(sr0,%r21)? OR | |
3130 | Does it look like a bve (r21)? (this is on PA2.0) | |
3131 | Does it look like a bve, n(r21)? (this is also on PA2.0) | |
3132 | That's the branch from an | |
c5aa993b | 3133 | import stub to an export stub. |
c906108c | 3134 | |
c5aa993b JM |
3135 | It is impossible to determine the target of the branch via |
3136 | simple examination of instructions and/or data (consider | |
3137 | that the address in the plabel may be the address of the | |
3138 | bind-on-reference routine in the dynamic loader). | |
c906108c | 3139 | |
c5aa993b | 3140 | So we have try an alternative approach. |
c906108c | 3141 | |
c5aa993b JM |
3142 | Get the name of the symbol at our current location; it should |
3143 | be a stub symbol with the same name as the symbol in the | |
3144 | shared library. | |
c906108c | 3145 | |
c5aa993b JM |
3146 | Then lookup a minimal symbol with the same name; we should |
3147 | get the minimal symbol for the target routine in the shared | |
3148 | library as those take precedence of import/export stubs. */ | |
c906108c | 3149 | if ((curr_inst == 0xe2a00000) || |
c5aa993b JM |
3150 | (curr_inst == 0xe2a00002) || |
3151 | (curr_inst == 0xeaa0d000) || | |
3152 | (curr_inst == 0xeaa0d002)) | |
c906108c SS |
3153 | { |
3154 | struct minimal_symbol *stubsym, *libsym; | |
3155 | ||
3156 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
3157 | if (stubsym == NULL) | |
3158 | { | |
3159 | warning ("Unable to find symbol for 0x%x", loc); | |
3160 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3161 | } | |
3162 | ||
3163 | libsym = lookup_minimal_symbol (SYMBOL_NAME (stubsym), NULL, NULL); | |
3164 | if (libsym == NULL) | |
3165 | { | |
3166 | warning ("Unable to find library symbol for %s\n", | |
3167 | SYMBOL_NAME (stubsym)); | |
3168 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3169 | } | |
3170 | ||
3171 | return SYMBOL_VALUE (libsym); | |
3172 | } | |
3173 | ||
3174 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a | |
c5aa993b JM |
3175 | branch from the stub to the actual function. */ |
3176 | /*elz */ | |
c906108c SS |
3177 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 |
3178 | || (curr_inst & 0xffe0e000) == 0xe8000000 | |
c5aa993b | 3179 | || (curr_inst & 0xffe0e000) == 0xe800A000) |
c906108c SS |
3180 | return (loc + extract_17 (curr_inst) + 8) & ~0x3; |
3181 | ||
3182 | /* Does it look like bv (rp)? Note this depends on the | |
c5aa993b JM |
3183 | current stack pointer being the same as the stack |
3184 | pointer in the stub itself! This is a branch on from the | |
3185 | stub back to the original caller. */ | |
3186 | /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */ | |
c906108c SS |
3187 | else if ((curr_inst & 0xffe0f000) == 0xe840c000) |
3188 | { | |
3189 | /* Yup. See if the previous instruction loaded | |
3190 | rp from sp - 8. */ | |
3191 | if (prev_inst == 0x4bc23ff1) | |
3192 | return (read_memory_integer | |
3193 | (read_register (SP_REGNUM) - 8, 4)) & ~0x3; | |
3194 | else | |
3195 | { | |
3196 | warning ("Unable to find restore of %%rp before bv (%%rp)."); | |
3197 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3198 | } | |
3199 | } | |
3200 | ||
3201 | /* elz: added this case to capture the new instruction | |
3202 | at the end of the return part of an export stub used by | |
3203 | the PA2.0: BVE, n (rp) */ | |
3204 | else if ((curr_inst & 0xffe0f000) == 0xe840d000) | |
3205 | { | |
c5aa993b | 3206 | return (read_memory_integer |
53a5351d | 3207 | (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; |
c906108c SS |
3208 | } |
3209 | ||
3210 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
c5aa993b | 3211 | the original caller from the stub. Used in dynamic executables. */ |
c906108c SS |
3212 | else if (curr_inst == 0xe0400002) |
3213 | { | |
3214 | /* The value we jump to is sitting in sp - 24. But that's | |
3215 | loaded several instructions before the be instruction. | |
3216 | I guess we could check for the previous instruction being | |
3217 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
c5aa993b | 3218 | return (read_memory_integer |
53a5351d | 3219 | (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; |
c906108c SS |
3220 | } |
3221 | ||
3222 | /* Haven't found the branch yet, but we're still in the stub. | |
c5aa993b | 3223 | Keep looking. */ |
c906108c SS |
3224 | loc += 4; |
3225 | } | |
3226 | } | |
3227 | ||
3228 | ||
3229 | /* For the given instruction (INST), return any adjustment it makes | |
3230 | to the stack pointer or zero for no adjustment. | |
3231 | ||
3232 | This only handles instructions commonly found in prologues. */ | |
3233 | ||
3234 | static int | |
3235 | prologue_inst_adjust_sp (inst) | |
3236 | unsigned long inst; | |
3237 | { | |
3238 | /* This must persist across calls. */ | |
3239 | static int save_high21; | |
3240 | ||
3241 | /* The most common way to perform a stack adjustment ldo X(sp),sp */ | |
3242 | if ((inst & 0xffffc000) == 0x37de0000) | |
3243 | return extract_14 (inst); | |
3244 | ||
3245 | /* stwm X,D(sp) */ | |
3246 | if ((inst & 0xffe00000) == 0x6fc00000) | |
3247 | return extract_14 (inst); | |
3248 | ||
3249 | /* addil high21,%r1; ldo low11,(%r1),%r30) | |
3250 | save high bits in save_high21 for later use. */ | |
3251 | if ((inst & 0xffe00000) == 0x28200000) | |
3252 | { | |
3253 | save_high21 = extract_21 (inst); | |
3254 | return 0; | |
3255 | } | |
3256 | ||
3257 | if ((inst & 0xffff0000) == 0x343e0000) | |
3258 | return save_high21 + extract_14 (inst); | |
3259 | ||
3260 | /* fstws as used by the HP compilers. */ | |
3261 | if ((inst & 0xffffffe0) == 0x2fd01220) | |
3262 | return extract_5_load (inst); | |
3263 | ||
3264 | /* No adjustment. */ | |
3265 | return 0; | |
3266 | } | |
3267 | ||
3268 | /* Return nonzero if INST is a branch of some kind, else return zero. */ | |
3269 | ||
3270 | static int | |
3271 | is_branch (inst) | |
3272 | unsigned long inst; | |
3273 | { | |
3274 | switch (inst >> 26) | |
3275 | { | |
3276 | case 0x20: | |
3277 | case 0x21: | |
3278 | case 0x22: | |
3279 | case 0x23: | |
7be570e7 | 3280 | case 0x27: |
c906108c SS |
3281 | case 0x28: |
3282 | case 0x29: | |
3283 | case 0x2a: | |
3284 | case 0x2b: | |
7be570e7 | 3285 | case 0x2f: |
c906108c SS |
3286 | case 0x30: |
3287 | case 0x31: | |
3288 | case 0x32: | |
3289 | case 0x33: | |
3290 | case 0x38: | |
3291 | case 0x39: | |
3292 | case 0x3a: | |
7be570e7 | 3293 | case 0x3b: |
c906108c SS |
3294 | return 1; |
3295 | ||
3296 | default: | |
3297 | return 0; | |
3298 | } | |
3299 | } | |
3300 | ||
3301 | /* Return the register number for a GR which is saved by INST or | |
3302 | zero it INST does not save a GR. */ | |
3303 | ||
3304 | static int | |
3305 | inst_saves_gr (inst) | |
3306 | unsigned long inst; | |
3307 | { | |
3308 | /* Does it look like a stw? */ | |
7be570e7 JM |
3309 | if ((inst >> 26) == 0x1a || (inst >> 26) == 0x1b |
3310 | || (inst >> 26) == 0x1f | |
3311 | || ((inst >> 26) == 0x1f | |
3312 | && ((inst >> 6) == 0xa))) | |
3313 | return extract_5R_store (inst); | |
3314 | ||
3315 | /* Does it look like a std? */ | |
3316 | if ((inst >> 26) == 0x1c | |
3317 | || ((inst >> 26) == 0x03 | |
3318 | && ((inst >> 6) & 0xf) == 0xb)) | |
c906108c SS |
3319 | return extract_5R_store (inst); |
3320 | ||
3321 | /* Does it look like a stwm? GCC & HPC may use this in prologues. */ | |
3322 | if ((inst >> 26) == 0x1b) | |
3323 | return extract_5R_store (inst); | |
3324 | ||
3325 | /* Does it look like sth or stb? HPC versions 9.0 and later use these | |
3326 | too. */ | |
7be570e7 JM |
3327 | if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18 |
3328 | || ((inst >> 26) == 0x3 | |
3329 | && (((inst >> 6) & 0xf) == 0x8 | |
3330 | || (inst >> 6) & 0xf) == 0x9)) | |
c906108c | 3331 | return extract_5R_store (inst); |
c5aa993b | 3332 | |
c906108c SS |
3333 | return 0; |
3334 | } | |
3335 | ||
3336 | /* Return the register number for a FR which is saved by INST or | |
3337 | zero it INST does not save a FR. | |
3338 | ||
3339 | Note we only care about full 64bit register stores (that's the only | |
3340 | kind of stores the prologue will use). | |
3341 | ||
3342 | FIXME: What about argument stores with the HP compiler in ANSI mode? */ | |
3343 | ||
3344 | static int | |
3345 | inst_saves_fr (inst) | |
3346 | unsigned long inst; | |
3347 | { | |
7be570e7 | 3348 | /* is this an FSTD ? */ |
c906108c SS |
3349 | if ((inst & 0xfc00dfc0) == 0x2c001200) |
3350 | return extract_5r_store (inst); | |
7be570e7 JM |
3351 | if ((inst & 0xfc000002) == 0x70000002) |
3352 | return extract_5R_store (inst); | |
3353 | /* is this an FSTW ? */ | |
c906108c SS |
3354 | if ((inst & 0xfc00df80) == 0x24001200) |
3355 | return extract_5r_store (inst); | |
7be570e7 JM |
3356 | if ((inst & 0xfc000002) == 0x7c000000) |
3357 | return extract_5R_store (inst); | |
c906108c SS |
3358 | return 0; |
3359 | } | |
3360 | ||
3361 | /* Advance PC across any function entry prologue instructions | |
3362 | to reach some "real" code. | |
3363 | ||
3364 | Use information in the unwind table to determine what exactly should | |
3365 | be in the prologue. */ | |
3366 | ||
3367 | ||
3368 | CORE_ADDR | |
3369 | skip_prologue_hard_way (pc) | |
3370 | CORE_ADDR pc; | |
3371 | { | |
3372 | char buf[4]; | |
3373 | CORE_ADDR orig_pc = pc; | |
3374 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; | |
3375 | unsigned long args_stored, status, i, restart_gr, restart_fr; | |
3376 | struct unwind_table_entry *u; | |
3377 | ||
3378 | restart_gr = 0; | |
3379 | restart_fr = 0; | |
3380 | ||
3381 | restart: | |
3382 | u = find_unwind_entry (pc); | |
3383 | if (!u) | |
3384 | return pc; | |
3385 | ||
c5aa993b | 3386 | /* If we are not at the beginning of a function, then return now. */ |
c906108c SS |
3387 | if ((pc & ~0x3) != u->region_start) |
3388 | return pc; | |
3389 | ||
3390 | /* This is how much of a frame adjustment we need to account for. */ | |
3391 | stack_remaining = u->Total_frame_size << 3; | |
3392 | ||
3393 | /* Magic register saves we want to know about. */ | |
3394 | save_rp = u->Save_RP; | |
3395 | save_sp = u->Save_SP; | |
3396 | ||
3397 | /* An indication that args may be stored into the stack. Unfortunately | |
3398 | the HPUX compilers tend to set this in cases where no args were | |
3399 | stored too!. */ | |
3400 | args_stored = 1; | |
3401 | ||
3402 | /* Turn the Entry_GR field into a bitmask. */ | |
3403 | save_gr = 0; | |
3404 | for (i = 3; i < u->Entry_GR + 3; i++) | |
3405 | { | |
3406 | /* Frame pointer gets saved into a special location. */ | |
3407 | if (u->Save_SP && i == FP_REGNUM) | |
3408 | continue; | |
3409 | ||
3410 | save_gr |= (1 << i); | |
3411 | } | |
3412 | save_gr &= ~restart_gr; | |
3413 | ||
3414 | /* Turn the Entry_FR field into a bitmask too. */ | |
3415 | save_fr = 0; | |
3416 | for (i = 12; i < u->Entry_FR + 12; i++) | |
3417 | save_fr |= (1 << i); | |
3418 | save_fr &= ~restart_fr; | |
3419 | ||
3420 | /* Loop until we find everything of interest or hit a branch. | |
3421 | ||
3422 | For unoptimized GCC code and for any HP CC code this will never ever | |
3423 | examine any user instructions. | |
3424 | ||
3425 | For optimzied GCC code we're faced with problems. GCC will schedule | |
3426 | its prologue and make prologue instructions available for delay slot | |
3427 | filling. The end result is user code gets mixed in with the prologue | |
3428 | and a prologue instruction may be in the delay slot of the first branch | |
3429 | or call. | |
3430 | ||
3431 | Some unexpected things are expected with debugging optimized code, so | |
3432 | we allow this routine to walk past user instructions in optimized | |
3433 | GCC code. */ | |
3434 | while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0 | |
3435 | || args_stored) | |
3436 | { | |
3437 | unsigned int reg_num; | |
3438 | unsigned long old_stack_remaining, old_save_gr, old_save_fr; | |
3439 | unsigned long old_save_rp, old_save_sp, next_inst; | |
3440 | ||
3441 | /* Save copies of all the triggers so we can compare them later | |
c5aa993b | 3442 | (only for HPC). */ |
c906108c SS |
3443 | old_save_gr = save_gr; |
3444 | old_save_fr = save_fr; | |
3445 | old_save_rp = save_rp; | |
3446 | old_save_sp = save_sp; | |
3447 | old_stack_remaining = stack_remaining; | |
3448 | ||
3449 | status = target_read_memory (pc, buf, 4); | |
3450 | inst = extract_unsigned_integer (buf, 4); | |
c5aa993b | 3451 | |
c906108c SS |
3452 | /* Yow! */ |
3453 | if (status != 0) | |
3454 | return pc; | |
3455 | ||
3456 | /* Note the interesting effects of this instruction. */ | |
3457 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
3458 | ||
7be570e7 JM |
3459 | /* There are limited ways to store the return pointer into the |
3460 | stack. */ | |
3461 | if (inst == 0x6bc23fd9 || inst == 0x0fc212c1) | |
c906108c SS |
3462 | save_rp = 0; |
3463 | ||
3464 | /* This is the only way we save SP into the stack. At this time | |
c5aa993b | 3465 | the HP compilers never bother to save SP into the stack. */ |
c906108c SS |
3466 | if ((inst & 0xffffc000) == 0x6fc10000) |
3467 | save_sp = 0; | |
3468 | ||
3469 | /* Account for general and floating-point register saves. */ | |
3470 | reg_num = inst_saves_gr (inst); | |
3471 | save_gr &= ~(1 << reg_num); | |
3472 | ||
3473 | /* Ugh. Also account for argument stores into the stack. | |
c5aa993b JM |
3474 | Unfortunately args_stored only tells us that some arguments |
3475 | where stored into the stack. Not how many or what kind! | |
c906108c | 3476 | |
c5aa993b JM |
3477 | This is a kludge as on the HP compiler sets this bit and it |
3478 | never does prologue scheduling. So once we see one, skip past | |
3479 | all of them. We have similar code for the fp arg stores below. | |
c906108c | 3480 | |
c5aa993b JM |
3481 | FIXME. Can still die if we have a mix of GR and FR argument |
3482 | stores! */ | |
c906108c SS |
3483 | if (reg_num >= 23 && reg_num <= 26) |
3484 | { | |
3485 | while (reg_num >= 23 && reg_num <= 26) | |
3486 | { | |
3487 | pc += 4; | |
3488 | status = target_read_memory (pc, buf, 4); | |
3489 | inst = extract_unsigned_integer (buf, 4); | |
3490 | if (status != 0) | |
3491 | return pc; | |
3492 | reg_num = inst_saves_gr (inst); | |
3493 | } | |
3494 | args_stored = 0; | |
3495 | continue; | |
3496 | } | |
3497 | ||
3498 | reg_num = inst_saves_fr (inst); | |
3499 | save_fr &= ~(1 << reg_num); | |
3500 | ||
3501 | status = target_read_memory (pc + 4, buf, 4); | |
3502 | next_inst = extract_unsigned_integer (buf, 4); | |
c5aa993b | 3503 | |
c906108c SS |
3504 | /* Yow! */ |
3505 | if (status != 0) | |
3506 | return pc; | |
3507 | ||
3508 | /* We've got to be read to handle the ldo before the fp register | |
c5aa993b | 3509 | save. */ |
c906108c SS |
3510 | if ((inst & 0xfc000000) == 0x34000000 |
3511 | && inst_saves_fr (next_inst) >= 4 | |
3512 | && inst_saves_fr (next_inst) <= 7) | |
3513 | { | |
3514 | /* So we drop into the code below in a reasonable state. */ | |
3515 | reg_num = inst_saves_fr (next_inst); | |
3516 | pc -= 4; | |
3517 | } | |
3518 | ||
3519 | /* Ugh. Also account for argument stores into the stack. | |
c5aa993b JM |
3520 | This is a kludge as on the HP compiler sets this bit and it |
3521 | never does prologue scheduling. So once we see one, skip past | |
3522 | all of them. */ | |
c906108c SS |
3523 | if (reg_num >= 4 && reg_num <= 7) |
3524 | { | |
3525 | while (reg_num >= 4 && reg_num <= 7) | |
3526 | { | |
3527 | pc += 8; | |
3528 | status = target_read_memory (pc, buf, 4); | |
3529 | inst = extract_unsigned_integer (buf, 4); | |
3530 | if (status != 0) | |
3531 | return pc; | |
3532 | if ((inst & 0xfc000000) != 0x34000000) | |
3533 | break; | |
3534 | status = target_read_memory (pc + 4, buf, 4); | |
3535 | next_inst = extract_unsigned_integer (buf, 4); | |
3536 | if (status != 0) | |
3537 | return pc; | |
3538 | reg_num = inst_saves_fr (next_inst); | |
3539 | } | |
3540 | args_stored = 0; | |
3541 | continue; | |
3542 | } | |
3543 | ||
3544 | /* Quit if we hit any kind of branch. This can happen if a prologue | |
c5aa993b | 3545 | instruction is in the delay slot of the first call/branch. */ |
c906108c SS |
3546 | if (is_branch (inst)) |
3547 | break; | |
3548 | ||
3549 | /* What a crock. The HP compilers set args_stored even if no | |
c5aa993b JM |
3550 | arguments were stored into the stack (boo hiss). This could |
3551 | cause this code to then skip a bunch of user insns (up to the | |
3552 | first branch). | |
3553 | ||
3554 | To combat this we try to identify when args_stored was bogusly | |
3555 | set and clear it. We only do this when args_stored is nonzero, | |
3556 | all other resources are accounted for, and nothing changed on | |
3557 | this pass. */ | |
c906108c | 3558 | if (args_stored |
c5aa993b | 3559 | && !(save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) |
c906108c SS |
3560 | && old_save_gr == save_gr && old_save_fr == save_fr |
3561 | && old_save_rp == save_rp && old_save_sp == save_sp | |
3562 | && old_stack_remaining == stack_remaining) | |
3563 | break; | |
c5aa993b | 3564 | |
c906108c SS |
3565 | /* Bump the PC. */ |
3566 | pc += 4; | |
3567 | } | |
3568 | ||
3569 | /* We've got a tenative location for the end of the prologue. However | |
3570 | because of limitations in the unwind descriptor mechanism we may | |
3571 | have went too far into user code looking for the save of a register | |
3572 | that does not exist. So, if there registers we expected to be saved | |
3573 | but never were, mask them out and restart. | |
3574 | ||
3575 | This should only happen in optimized code, and should be very rare. */ | |
c5aa993b | 3576 | if (save_gr || (save_fr && !(restart_fr || restart_gr))) |
c906108c SS |
3577 | { |
3578 | pc = orig_pc; | |
3579 | restart_gr = save_gr; | |
3580 | restart_fr = save_fr; | |
3581 | goto restart; | |
3582 | } | |
3583 | ||
3584 | return pc; | |
3585 | } | |
3586 | ||
3587 | ||
7be570e7 JM |
3588 | /* Return the address of the PC after the last prologue instruction if |
3589 | we can determine it from the debug symbols. Else return zero. */ | |
c906108c SS |
3590 | |
3591 | static CORE_ADDR | |
3592 | after_prologue (pc) | |
3593 | CORE_ADDR pc; | |
3594 | { | |
3595 | struct symtab_and_line sal; | |
3596 | CORE_ADDR func_addr, func_end; | |
3597 | struct symbol *f; | |
3598 | ||
7be570e7 JM |
3599 | /* If we can not find the symbol in the partial symbol table, then |
3600 | there is no hope we can determine the function's start address | |
3601 | with this code. */ | |
c906108c | 3602 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
7be570e7 | 3603 | return 0; |
c906108c | 3604 | |
7be570e7 | 3605 | /* Get the line associated with FUNC_ADDR. */ |
c906108c SS |
3606 | sal = find_pc_line (func_addr, 0); |
3607 | ||
7be570e7 JM |
3608 | /* There are only two cases to consider. First, the end of the source line |
3609 | is within the function bounds. In that case we return the end of the | |
3610 | source line. Second is the end of the source line extends beyond the | |
3611 | bounds of the current function. We need to use the slow code to | |
3612 | examine instructions in that case. | |
c906108c | 3613 | |
7be570e7 JM |
3614 | Anything else is simply a bug elsewhere. Fixing it here is absolutely |
3615 | the wrong thing to do. In fact, it should be entirely possible for this | |
3616 | function to always return zero since the slow instruction scanning code | |
3617 | is supposed to *always* work. If it does not, then it is a bug. */ | |
3618 | if (sal.end < func_end) | |
3619 | return sal.end; | |
c5aa993b | 3620 | else |
7be570e7 | 3621 | return 0; |
c906108c SS |
3622 | } |
3623 | ||
3624 | /* To skip prologues, I use this predicate. Returns either PC itself | |
3625 | if the code at PC does not look like a function prologue; otherwise | |
3626 | returns an address that (if we're lucky) follows the prologue. If | |
3627 | LENIENT, then we must skip everything which is involved in setting | |
3628 | up the frame (it's OK to skip more, just so long as we don't skip | |
3629 | anything which might clobber the registers which are being saved. | |
3630 | Currently we must not skip more on the alpha, but we might the lenient | |
3631 | stuff some day. */ | |
3632 | ||
3633 | CORE_ADDR | |
b83266a0 | 3634 | hppa_skip_prologue (pc) |
c906108c SS |
3635 | CORE_ADDR pc; |
3636 | { | |
c5aa993b JM |
3637 | unsigned long inst; |
3638 | int offset; | |
3639 | CORE_ADDR post_prologue_pc; | |
3640 | char buf[4]; | |
c906108c | 3641 | |
c5aa993b JM |
3642 | /* See if we can determine the end of the prologue via the symbol table. |
3643 | If so, then return either PC, or the PC after the prologue, whichever | |
3644 | is greater. */ | |
c906108c | 3645 | |
c5aa993b | 3646 | post_prologue_pc = after_prologue (pc); |
c906108c | 3647 | |
7be570e7 JM |
3648 | /* If after_prologue returned a useful address, then use it. Else |
3649 | fall back on the instruction skipping code. | |
3650 | ||
3651 | Some folks have claimed this causes problems because the breakpoint | |
3652 | may be the first instruction of the prologue. If that happens, then | |
3653 | the instruction skipping code has a bug that needs to be fixed. */ | |
c5aa993b JM |
3654 | if (post_prologue_pc != 0) |
3655 | return max (pc, post_prologue_pc); | |
c5aa993b JM |
3656 | else |
3657 | return (skip_prologue_hard_way (pc)); | |
c906108c SS |
3658 | } |
3659 | ||
3660 | /* Put here the code to store, into a struct frame_saved_regs, | |
3661 | the addresses of the saved registers of frame described by FRAME_INFO. | |
3662 | This includes special registers such as pc and fp saved in special | |
3663 | ways in the stack frame. sp is even more special: | |
3664 | the address we return for it IS the sp for the next frame. */ | |
3665 | ||
3666 | void | |
3667 | hppa_frame_find_saved_regs (frame_info, frame_saved_regs) | |
3668 | struct frame_info *frame_info; | |
3669 | struct frame_saved_regs *frame_saved_regs; | |
3670 | { | |
3671 | CORE_ADDR pc; | |
3672 | struct unwind_table_entry *u; | |
3673 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; | |
3674 | int status, i, reg; | |
3675 | char buf[4]; | |
3676 | int fp_loc = -1; | |
3677 | ||
3678 | /* Zero out everything. */ | |
3679 | memset (frame_saved_regs, '\0', sizeof (struct frame_saved_regs)); | |
3680 | ||
3681 | /* Call dummy frames always look the same, so there's no need to | |
3682 | examine the dummy code to determine locations of saved registers; | |
3683 | instead, let find_dummy_frame_regs fill in the correct offsets | |
3684 | for the saved registers. */ | |
3685 | if ((frame_info->pc >= frame_info->frame | |
53a5351d JM |
3686 | && frame_info->pc <= (frame_info->frame |
3687 | /* A call dummy is sized in words, but it is | |
3688 | actually a series of instructions. Account | |
3689 | for that scaling factor. */ | |
3690 | + ((REGISTER_SIZE / INSTRUCTION_SIZE) | |
3691 | * CALL_DUMMY_LENGTH) | |
3692 | /* Similarly we have to account for 64bit | |
3693 | wide register saves. */ | |
3694 | + (32 * REGISTER_SIZE) | |
3695 | /* We always consider FP regs 8 bytes long. */ | |
3696 | + (NUM_REGS - FP0_REGNUM) * 8 | |
3697 | /* Similarly we have to account for 64bit | |
3698 | wide register saves. */ | |
3699 | + (6 * REGISTER_SIZE)))) | |
c906108c SS |
3700 | find_dummy_frame_regs (frame_info, frame_saved_regs); |
3701 | ||
3702 | /* Interrupt handlers are special too. They lay out the register | |
3703 | state in the exact same order as the register numbers in GDB. */ | |
3704 | if (pc_in_interrupt_handler (frame_info->pc)) | |
3705 | { | |
3706 | for (i = 0; i < NUM_REGS; i++) | |
3707 | { | |
3708 | /* SP is a little special. */ | |
3709 | if (i == SP_REGNUM) | |
3710 | frame_saved_regs->regs[SP_REGNUM] | |
53a5351d JM |
3711 | = read_memory_integer (frame_info->frame + SP_REGNUM * 4, |
3712 | TARGET_PTR_BIT / 8); | |
c906108c SS |
3713 | else |
3714 | frame_saved_regs->regs[i] = frame_info->frame + i * 4; | |
3715 | } | |
3716 | return; | |
3717 | } | |
3718 | ||
3719 | #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP | |
3720 | /* Handle signal handler callers. */ | |
3721 | if (frame_info->signal_handler_caller) | |
3722 | { | |
3723 | FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs); | |
3724 | return; | |
3725 | } | |
3726 | #endif | |
3727 | ||
3728 | /* Get the starting address of the function referred to by the PC | |
3729 | saved in frame. */ | |
3730 | pc = get_pc_function_start (frame_info->pc); | |
3731 | ||
3732 | /* Yow! */ | |
3733 | u = find_unwind_entry (pc); | |
3734 | if (!u) | |
3735 | return; | |
3736 | ||
3737 | /* This is how much of a frame adjustment we need to account for. */ | |
3738 | stack_remaining = u->Total_frame_size << 3; | |
3739 | ||
3740 | /* Magic register saves we want to know about. */ | |
3741 | save_rp = u->Save_RP; | |
3742 | save_sp = u->Save_SP; | |
3743 | ||
3744 | /* Turn the Entry_GR field into a bitmask. */ | |
3745 | save_gr = 0; | |
3746 | for (i = 3; i < u->Entry_GR + 3; i++) | |
3747 | { | |
3748 | /* Frame pointer gets saved into a special location. */ | |
3749 | if (u->Save_SP && i == FP_REGNUM) | |
3750 | continue; | |
3751 | ||
3752 | save_gr |= (1 << i); | |
3753 | } | |
3754 | ||
3755 | /* Turn the Entry_FR field into a bitmask too. */ | |
3756 | save_fr = 0; | |
3757 | for (i = 12; i < u->Entry_FR + 12; i++) | |
3758 | save_fr |= (1 << i); | |
3759 | ||
3760 | /* The frame always represents the value of %sp at entry to the | |
3761 | current function (and is thus equivalent to the "saved" stack | |
3762 | pointer. */ | |
3763 | frame_saved_regs->regs[SP_REGNUM] = frame_info->frame; | |
3764 | ||
3765 | /* Loop until we find everything of interest or hit a branch. | |
3766 | ||
3767 | For unoptimized GCC code and for any HP CC code this will never ever | |
3768 | examine any user instructions. | |
3769 | ||
7be570e7 | 3770 | For optimized GCC code we're faced with problems. GCC will schedule |
c906108c SS |
3771 | its prologue and make prologue instructions available for delay slot |
3772 | filling. The end result is user code gets mixed in with the prologue | |
3773 | and a prologue instruction may be in the delay slot of the first branch | |
3774 | or call. | |
3775 | ||
3776 | Some unexpected things are expected with debugging optimized code, so | |
3777 | we allow this routine to walk past user instructions in optimized | |
3778 | GCC code. */ | |
3779 | while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) | |
3780 | { | |
3781 | status = target_read_memory (pc, buf, 4); | |
3782 | inst = extract_unsigned_integer (buf, 4); | |
3783 | ||
3784 | /* Yow! */ | |
3785 | if (status != 0) | |
3786 | return; | |
3787 | ||
3788 | /* Note the interesting effects of this instruction. */ | |
3789 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
3790 | ||
3791 | /* There is only one instruction used for saving RP into the stack. */ | |
3792 | if (inst == 0x6bc23fd9) | |
3793 | { | |
3794 | save_rp = 0; | |
3795 | frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 20; | |
3796 | } | |
3797 | ||
3798 | /* Just note that we found the save of SP into the stack. The | |
c5aa993b | 3799 | value for frame_saved_regs was computed above. */ |
c906108c SS |
3800 | if ((inst & 0xffffc000) == 0x6fc10000) |
3801 | save_sp = 0; | |
3802 | ||
3803 | /* Account for general and floating-point register saves. */ | |
3804 | reg = inst_saves_gr (inst); | |
3805 | if (reg >= 3 && reg <= 18 | |
3806 | && (!u->Save_SP || reg != FP_REGNUM)) | |
3807 | { | |
3808 | save_gr &= ~(1 << reg); | |
3809 | ||
3810 | /* stwm with a positive displacement is a *post modify*. */ | |
3811 | if ((inst >> 26) == 0x1b | |
3812 | && extract_14 (inst) >= 0) | |
3813 | frame_saved_regs->regs[reg] = frame_info->frame; | |
3814 | else | |
3815 | { | |
3816 | /* Handle code with and without frame pointers. */ | |
3817 | if (u->Save_SP) | |
3818 | frame_saved_regs->regs[reg] | |
3819 | = frame_info->frame + extract_14 (inst); | |
3820 | else | |
3821 | frame_saved_regs->regs[reg] | |
3822 | = frame_info->frame + (u->Total_frame_size << 3) | |
c5aa993b | 3823 | + extract_14 (inst); |
c906108c SS |
3824 | } |
3825 | } | |
3826 | ||
3827 | ||
3828 | /* GCC handles callee saved FP regs a little differently. | |
3829 | ||
c5aa993b JM |
3830 | It emits an instruction to put the value of the start of |
3831 | the FP store area into %r1. It then uses fstds,ma with | |
3832 | a basereg of %r1 for the stores. | |
c906108c | 3833 | |
c5aa993b JM |
3834 | HP CC emits them at the current stack pointer modifying |
3835 | the stack pointer as it stores each register. */ | |
c906108c SS |
3836 | |
3837 | /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */ | |
3838 | if ((inst & 0xffffc000) == 0x34610000 | |
3839 | || (inst & 0xffffc000) == 0x37c10000) | |
3840 | fp_loc = extract_14 (inst); | |
c5aa993b | 3841 | |
c906108c SS |
3842 | reg = inst_saves_fr (inst); |
3843 | if (reg >= 12 && reg <= 21) | |
3844 | { | |
3845 | /* Note +4 braindamage below is necessary because the FP status | |
3846 | registers are internally 8 registers rather than the expected | |
3847 | 4 registers. */ | |
3848 | save_fr &= ~(1 << reg); | |
3849 | if (fp_loc == -1) | |
3850 | { | |
3851 | /* 1st HP CC FP register store. After this instruction | |
c5aa993b JM |
3852 | we've set enough state that the GCC and HPCC code are |
3853 | both handled in the same manner. */ | |
c906108c SS |
3854 | frame_saved_regs->regs[reg + FP4_REGNUM + 4] = frame_info->frame; |
3855 | fp_loc = 8; | |
3856 | } | |
3857 | else | |
3858 | { | |
3859 | frame_saved_regs->regs[reg + FP0_REGNUM + 4] | |
3860 | = frame_info->frame + fp_loc; | |
3861 | fp_loc += 8; | |
3862 | } | |
3863 | } | |
3864 | ||
3865 | /* Quit if we hit any kind of branch. This can happen if a prologue | |
c5aa993b | 3866 | instruction is in the delay slot of the first call/branch. */ |
c906108c SS |
3867 | if (is_branch (inst)) |
3868 | break; | |
3869 | ||
3870 | /* Bump the PC. */ | |
3871 | pc += 4; | |
3872 | } | |
3873 | } | |
3874 | ||
3875 | ||
3876 | /* Exception handling support for the HP-UX ANSI C++ compiler. | |
3877 | The compiler (aCC) provides a callback for exception events; | |
3878 | GDB can set a breakpoint on this callback and find out what | |
3879 | exception event has occurred. */ | |
3880 | ||
3881 | /* The name of the hook to be set to point to the callback function */ | |
c5aa993b JM |
3882 | static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; |
3883 | /* The name of the function to be used to set the hook value */ | |
3884 | static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; | |
3885 | /* The name of the callback function in end.o */ | |
c906108c | 3886 | static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; |
c5aa993b JM |
3887 | /* Name of function in end.o on which a break is set (called by above) */ |
3888 | static char HP_ACC_EH_break[] = "__d_eh_break"; | |
3889 | /* Name of flag (in end.o) that enables catching throws */ | |
3890 | static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; | |
3891 | /* Name of flag (in end.o) that enables catching catching */ | |
3892 | static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; | |
3893 | /* The enum used by aCC */ | |
3894 | typedef enum | |
3895 | { | |
3896 | __EH_NOTIFY_THROW, | |
3897 | __EH_NOTIFY_CATCH | |
3898 | } | |
3899 | __eh_notification; | |
c906108c SS |
3900 | |
3901 | /* Is exception-handling support available with this executable? */ | |
3902 | static int hp_cxx_exception_support = 0; | |
3903 | /* Has the initialize function been run? */ | |
3904 | int hp_cxx_exception_support_initialized = 0; | |
3905 | /* Similar to above, but imported from breakpoint.c -- non-target-specific */ | |
3906 | extern int exception_support_initialized; | |
3907 | /* Address of __eh_notify_hook */ | |
a0b3c4fd | 3908 | static CORE_ADDR eh_notify_hook_addr = 0; |
c906108c | 3909 | /* Address of __d_eh_notify_callback */ |
a0b3c4fd | 3910 | static CORE_ADDR eh_notify_callback_addr = 0; |
c906108c | 3911 | /* Address of __d_eh_break */ |
a0b3c4fd | 3912 | static CORE_ADDR eh_break_addr = 0; |
c906108c | 3913 | /* Address of __d_eh_catch_catch */ |
a0b3c4fd | 3914 | static CORE_ADDR eh_catch_catch_addr = 0; |
c906108c | 3915 | /* Address of __d_eh_catch_throw */ |
a0b3c4fd | 3916 | static CORE_ADDR eh_catch_throw_addr = 0; |
c906108c | 3917 | /* Sal for __d_eh_break */ |
a0b3c4fd | 3918 | static struct symtab_and_line *break_callback_sal = 0; |
c906108c SS |
3919 | |
3920 | /* Code in end.c expects __d_pid to be set in the inferior, | |
3921 | otherwise __d_eh_notify_callback doesn't bother to call | |
3922 | __d_eh_break! So we poke the pid into this symbol | |
3923 | ourselves. | |
3924 | 0 => success | |
c5aa993b | 3925 | 1 => failure */ |
c906108c SS |
3926 | int |
3927 | setup_d_pid_in_inferior () | |
3928 | { | |
3929 | CORE_ADDR anaddr; | |
c5aa993b JM |
3930 | struct minimal_symbol *msymbol; |
3931 | char buf[4]; /* FIXME 32x64? */ | |
3932 | ||
c906108c SS |
3933 | /* Slam the pid of the process into __d_pid; failing is only a warning! */ |
3934 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
3935 | if (msymbol == NULL) | |
3936 | { | |
3937 | warning ("Unable to find __d_pid symbol in object file."); | |
3938 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
3939 | return 1; | |
3940 | } | |
3941 | ||
3942 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
c5aa993b JM |
3943 | store_unsigned_integer (buf, 4, inferior_pid); /* FIXME 32x64? */ |
3944 | if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ | |
c906108c SS |
3945 | { |
3946 | warning ("Unable to write __d_pid"); | |
3947 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
3948 | return 1; | |
3949 | } | |
3950 | return 0; | |
3951 | } | |
3952 | ||
3953 | /* Initialize exception catchpoint support by looking for the | |
3954 | necessary hooks/callbacks in end.o, etc., and set the hook value to | |
3955 | point to the required debug function | |
3956 | ||
3957 | Return 0 => failure | |
c5aa993b | 3958 | 1 => success */ |
c906108c SS |
3959 | |
3960 | static int | |
3961 | initialize_hp_cxx_exception_support () | |
3962 | { | |
3963 | struct symtabs_and_lines sals; | |
c5aa993b JM |
3964 | struct cleanup *old_chain; |
3965 | struct cleanup *canonical_strings_chain = NULL; | |
c906108c | 3966 | int i; |
c5aa993b JM |
3967 | char *addr_start; |
3968 | char *addr_end = NULL; | |
3969 | char **canonical = (char **) NULL; | |
c906108c | 3970 | int thread = -1; |
c5aa993b JM |
3971 | struct symbol *sym = NULL; |
3972 | struct minimal_symbol *msym = NULL; | |
3973 | struct objfile *objfile; | |
c906108c SS |
3974 | asection *shlib_info; |
3975 | ||
3976 | /* Detect and disallow recursion. On HP-UX with aCC, infinite | |
3977 | recursion is a possibility because finding the hook for exception | |
3978 | callbacks involves making a call in the inferior, which means | |
3979 | re-inserting breakpoints which can re-invoke this code */ | |
3980 | ||
c5aa993b JM |
3981 | static int recurse = 0; |
3982 | if (recurse > 0) | |
c906108c SS |
3983 | { |
3984 | hp_cxx_exception_support_initialized = 0; | |
3985 | exception_support_initialized = 0; | |
3986 | return 0; | |
3987 | } | |
3988 | ||
3989 | hp_cxx_exception_support = 0; | |
3990 | ||
3991 | /* First check if we have seen any HP compiled objects; if not, | |
3992 | it is very unlikely that HP's idiosyncratic callback mechanism | |
3993 | for exception handling debug support will be available! | |
3994 | This will percolate back up to breakpoint.c, where our callers | |
3995 | will decide to try the g++ exception-handling support instead. */ | |
3996 | if (!hp_som_som_object_present) | |
3997 | return 0; | |
c5aa993b | 3998 | |
c906108c SS |
3999 | /* We have a SOM executable with SOM debug info; find the hooks */ |
4000 | ||
4001 | /* First look for the notify hook provided by aCC runtime libs */ | |
4002 | /* If we find this symbol, we conclude that the executable must | |
4003 | have HP aCC exception support built in. If this symbol is not | |
4004 | found, even though we're a HP SOM-SOM file, we may have been | |
4005 | built with some other compiler (not aCC). This results percolates | |
4006 | back up to our callers in breakpoint.c which can decide to | |
4007 | try the g++ style of exception support instead. | |
4008 | If this symbol is found but the other symbols we require are | |
4009 | not found, there is something weird going on, and g++ support | |
4010 | should *not* be tried as an alternative. | |
c5aa993b | 4011 | |
c906108c SS |
4012 | ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. |
4013 | ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ | |
c5aa993b | 4014 | |
c906108c SS |
4015 | /* libCsup has this hook; it'll usually be non-debuggable */ |
4016 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); | |
4017 | if (msym) | |
4018 | { | |
4019 | eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4020 | hp_cxx_exception_support = 1; | |
c5aa993b | 4021 | } |
c906108c SS |
4022 | else |
4023 | { | |
4024 | warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook); | |
4025 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4026 | warning ("GDB will be unable to intercept exception events."); | |
4027 | eh_notify_hook_addr = 0; | |
4028 | hp_cxx_exception_support = 0; | |
4029 | return 0; | |
4030 | } | |
4031 | ||
c906108c | 4032 | /* Next look for the notify callback routine in end.o */ |
c5aa993b | 4033 | /* This is always available in the SOM symbol dictionary if end.o is linked in */ |
c906108c SS |
4034 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); |
4035 | if (msym) | |
4036 | { | |
4037 | eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4038 | hp_cxx_exception_support = 1; | |
c5aa993b JM |
4039 | } |
4040 | else | |
c906108c SS |
4041 | { |
4042 | warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback); | |
4043 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
4044 | warning ("GDB will be unable to intercept exception events."); | |
4045 | eh_notify_callback_addr = 0; | |
4046 | return 0; | |
4047 | } | |
4048 | ||
53a5351d | 4049 | #ifndef GDB_TARGET_IS_HPPA_20W |
c906108c SS |
4050 | /* Check whether the executable is dynamically linked or archive bound */ |
4051 | /* With an archive-bound executable we can use the raw addresses we find | |
4052 | for the callback function, etc. without modification. For an executable | |
4053 | with shared libraries, we have to do more work to find the plabel, which | |
4054 | can be the target of a call through $$dyncall from the aCC runtime support | |
4055 | library (libCsup) which is linked shared by default by aCC. */ | |
4056 | /* This test below was copied from somsolib.c/somread.c. It may not be a very | |
c5aa993b | 4057 | reliable one to test that an executable is linked shared. pai/1997-07-18 */ |
c906108c SS |
4058 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); |
4059 | if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) | |
4060 | { | |
4061 | /* The minsym we have has the local code address, but that's not the | |
4062 | plabel that can be used by an inter-load-module call. */ | |
4063 | /* Find solib handle for main image (which has end.o), and use that | |
4064 | and the min sym as arguments to __d_shl_get() (which does the equivalent | |
c5aa993b | 4065 | of shl_findsym()) to find the plabel. */ |
c906108c SS |
4066 | |
4067 | args_for_find_stub args; | |
4068 | static char message[] = "Error while finding exception callback hook:\n"; | |
c5aa993b | 4069 | |
c906108c SS |
4070 | args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr); |
4071 | args.msym = msym; | |
a0b3c4fd | 4072 | args.return_val = 0; |
c5aa993b | 4073 | |
c906108c | 4074 | recurse++; |
a0b3c4fd JM |
4075 | catch_errors (cover_find_stub_with_shl_get, (PTR) &args, message, |
4076 | RETURN_MASK_ALL); | |
4077 | eh_notify_callback_addr = args.return_val; | |
c906108c | 4078 | recurse--; |
c5aa993b | 4079 | |
c906108c | 4080 | exception_catchpoints_are_fragile = 1; |
c5aa993b | 4081 | |
c906108c | 4082 | if (!eh_notify_callback_addr) |
c5aa993b JM |
4083 | { |
4084 | /* We can get here either if there is no plabel in the export list | |
4085 | for the main image, or if something strange happened (??) */ | |
4086 | warning ("Couldn't find a plabel (indirect function label) for the exception callback."); | |
4087 | warning ("GDB will not be able to intercept exception events."); | |
4088 | return 0; | |
4089 | } | |
c906108c SS |
4090 | } |
4091 | else | |
4092 | exception_catchpoints_are_fragile = 0; | |
53a5351d | 4093 | #endif |
c906108c | 4094 | |
c906108c | 4095 | /* Now, look for the breakpointable routine in end.o */ |
c5aa993b | 4096 | /* This should also be available in the SOM symbol dict. if end.o linked in */ |
c906108c SS |
4097 | msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); |
4098 | if (msym) | |
4099 | { | |
4100 | eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4101 | hp_cxx_exception_support = 1; | |
c5aa993b | 4102 | } |
c906108c SS |
4103 | else |
4104 | { | |
4105 | warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break); | |
4106 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4107 | warning ("GDB will be unable to intercept exception events."); | |
4108 | eh_break_addr = 0; | |
4109 | return 0; | |
4110 | } | |
4111 | ||
c906108c SS |
4112 | /* Next look for the catch enable flag provided in end.o */ |
4113 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
c5aa993b JM |
4114 | VAR_NAMESPACE, 0, (struct symtab **) NULL); |
4115 | if (sym) /* sometimes present in debug info */ | |
c906108c SS |
4116 | { |
4117 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); | |
4118 | hp_cxx_exception_support = 1; | |
4119 | } | |
c5aa993b JM |
4120 | else |
4121 | /* otherwise look in SOM symbol dict. */ | |
c906108c SS |
4122 | { |
4123 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); | |
4124 | if (msym) | |
c5aa993b JM |
4125 | { |
4126 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4127 | hp_cxx_exception_support = 1; | |
4128 | } | |
c906108c | 4129 | else |
c5aa993b JM |
4130 | { |
4131 | warning ("Unable to enable interception of exception catches."); | |
4132 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4133 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4134 | return 0; | |
4135 | } | |
c906108c SS |
4136 | } |
4137 | ||
c906108c SS |
4138 | /* Next look for the catch enable flag provided end.o */ |
4139 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
c5aa993b JM |
4140 | VAR_NAMESPACE, 0, (struct symtab **) NULL); |
4141 | if (sym) /* sometimes present in debug info */ | |
c906108c SS |
4142 | { |
4143 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); | |
4144 | hp_cxx_exception_support = 1; | |
4145 | } | |
c5aa993b JM |
4146 | else |
4147 | /* otherwise look in SOM symbol dict. */ | |
c906108c SS |
4148 | { |
4149 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); | |
4150 | if (msym) | |
c5aa993b JM |
4151 | { |
4152 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4153 | hp_cxx_exception_support = 1; | |
4154 | } | |
c906108c | 4155 | else |
c5aa993b JM |
4156 | { |
4157 | warning ("Unable to enable interception of exception throws."); | |
4158 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4159 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4160 | return 0; | |
4161 | } | |
c906108c SS |
4162 | } |
4163 | ||
c5aa993b JM |
4164 | /* Set the flags */ |
4165 | hp_cxx_exception_support = 2; /* everything worked so far */ | |
c906108c SS |
4166 | hp_cxx_exception_support_initialized = 1; |
4167 | exception_support_initialized = 1; | |
4168 | ||
4169 | return 1; | |
4170 | } | |
4171 | ||
4172 | /* Target operation for enabling or disabling interception of | |
4173 | exception events. | |
4174 | KIND is either EX_EVENT_THROW or EX_EVENT_CATCH | |
4175 | ENABLE is either 0 (disable) or 1 (enable). | |
4176 | Return value is NULL if no support found; | |
4177 | -1 if something went wrong, | |
4178 | or a pointer to a symtab/line struct if the breakpointable | |
c5aa993b | 4179 | address was found. */ |
c906108c | 4180 | |
c5aa993b | 4181 | struct symtab_and_line * |
c906108c | 4182 | child_enable_exception_callback (kind, enable) |
c5aa993b JM |
4183 | enum exception_event_kind kind; |
4184 | int enable; | |
c906108c SS |
4185 | { |
4186 | char buf[4]; | |
4187 | ||
4188 | if (!exception_support_initialized || !hp_cxx_exception_support_initialized) | |
4189 | if (!initialize_hp_cxx_exception_support ()) | |
4190 | return NULL; | |
4191 | ||
4192 | switch (hp_cxx_exception_support) | |
4193 | { | |
c5aa993b JM |
4194 | case 0: |
4195 | /* Assuming no HP support at all */ | |
4196 | return NULL; | |
4197 | case 1: | |
4198 | /* HP support should be present, but something went wrong */ | |
4199 | return (struct symtab_and_line *) -1; /* yuck! */ | |
4200 | /* there may be other cases in the future */ | |
c906108c | 4201 | } |
c5aa993b | 4202 | |
c906108c | 4203 | /* Set the EH hook to point to the callback routine */ |
c5aa993b | 4204 | store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ |
c906108c | 4205 | /* pai: (temp) FIXME should there be a pack operation first? */ |
c5aa993b | 4206 | if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ |
c906108c SS |
4207 | { |
4208 | warning ("Could not write to target memory for exception event callback."); | |
4209 | warning ("Interception of exception events may not work."); | |
c5aa993b | 4210 | return (struct symtab_and_line *) -1; |
c906108c SS |
4211 | } |
4212 | if (enable) | |
4213 | { | |
c5aa993b | 4214 | /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */ |
c906108c | 4215 | if (inferior_pid > 0) |
c5aa993b JM |
4216 | { |
4217 | if (setup_d_pid_in_inferior ()) | |
4218 | return (struct symtab_and_line *) -1; | |
4219 | } | |
c906108c | 4220 | else |
c5aa993b JM |
4221 | { |
4222 | warning ("Internal error: Invalid inferior pid? Cannot intercept exception events."); /* purecov: deadcode */ | |
4223 | return (struct symtab_and_line *) -1; /* purecov: deadcode */ | |
4224 | } | |
c906108c | 4225 | } |
c5aa993b | 4226 | |
c906108c SS |
4227 | switch (kind) |
4228 | { | |
c5aa993b JM |
4229 | case EX_EVENT_THROW: |
4230 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
4231 | if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ | |
4232 | { | |
4233 | warning ("Couldn't enable exception throw interception."); | |
4234 | return (struct symtab_and_line *) -1; | |
4235 | } | |
4236 | break; | |
4237 | case EX_EVENT_CATCH: | |
4238 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
4239 | if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ | |
4240 | { | |
4241 | warning ("Couldn't enable exception catch interception."); | |
4242 | return (struct symtab_and_line *) -1; | |
4243 | } | |
4244 | break; | |
4245 | default: /* purecov: deadcode */ | |
4246 | error ("Request to enable unknown or unsupported exception event."); /* purecov: deadcode */ | |
c906108c | 4247 | } |
c5aa993b | 4248 | |
c906108c SS |
4249 | /* Copy break address into new sal struct, malloc'ing if needed. */ |
4250 | if (!break_callback_sal) | |
4251 | { | |
4252 | break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); | |
4253 | } | |
c5aa993b | 4254 | INIT_SAL (break_callback_sal); |
c906108c SS |
4255 | break_callback_sal->symtab = NULL; |
4256 | break_callback_sal->pc = eh_break_addr; | |
4257 | break_callback_sal->line = 0; | |
4258 | break_callback_sal->end = eh_break_addr; | |
c5aa993b | 4259 | |
c906108c SS |
4260 | return break_callback_sal; |
4261 | } | |
4262 | ||
c5aa993b | 4263 | /* Record some information about the current exception event */ |
c906108c | 4264 | static struct exception_event_record current_ex_event; |
c5aa993b JM |
4265 | /* Convenience struct */ |
4266 | static struct symtab_and_line null_symtab_and_line = | |
4267 | {NULL, 0, 0, 0}; | |
c906108c SS |
4268 | |
4269 | /* Report current exception event. Returns a pointer to a record | |
4270 | that describes the kind of the event, where it was thrown from, | |
4271 | and where it will be caught. More information may be reported | |
c5aa993b | 4272 | in the future */ |
c906108c SS |
4273 | struct exception_event_record * |
4274 | child_get_current_exception_event () | |
4275 | { | |
c5aa993b JM |
4276 | CORE_ADDR event_kind; |
4277 | CORE_ADDR throw_addr; | |
4278 | CORE_ADDR catch_addr; | |
c906108c SS |
4279 | struct frame_info *fi, *curr_frame; |
4280 | int level = 1; | |
4281 | ||
c5aa993b | 4282 | curr_frame = get_current_frame (); |
c906108c SS |
4283 | if (!curr_frame) |
4284 | return (struct exception_event_record *) NULL; | |
4285 | ||
4286 | /* Go up one frame to __d_eh_notify_callback, because at the | |
4287 | point when this code is executed, there's garbage in the | |
4288 | arguments of __d_eh_break. */ | |
4289 | fi = find_relative_frame (curr_frame, &level); | |
4290 | if (level != 0) | |
4291 | return (struct exception_event_record *) NULL; | |
4292 | ||
4293 | select_frame (fi, -1); | |
4294 | ||
4295 | /* Read in the arguments */ | |
4296 | /* __d_eh_notify_callback() is called with 3 arguments: | |
c5aa993b JM |
4297 | 1. event kind catch or throw |
4298 | 2. the target address if known | |
4299 | 3. a flag -- not sure what this is. pai/1997-07-17 */ | |
4300 | event_kind = read_register (ARG0_REGNUM); | |
c906108c SS |
4301 | catch_addr = read_register (ARG1_REGNUM); |
4302 | ||
4303 | /* Now go down to a user frame */ | |
4304 | /* For a throw, __d_eh_break is called by | |
c5aa993b JM |
4305 | __d_eh_notify_callback which is called by |
4306 | __notify_throw which is called | |
4307 | from user code. | |
c906108c | 4308 | For a catch, __d_eh_break is called by |
c5aa993b JM |
4309 | __d_eh_notify_callback which is called by |
4310 | <stackwalking stuff> which is called by | |
4311 | __throw__<stuff> or __rethrow_<stuff> which is called | |
4312 | from user code. */ | |
4313 | /* FIXME: Don't use such magic numbers; search for the frames */ | |
c906108c SS |
4314 | level = (event_kind == EX_EVENT_THROW) ? 3 : 4; |
4315 | fi = find_relative_frame (curr_frame, &level); | |
4316 | if (level != 0) | |
4317 | return (struct exception_event_record *) NULL; | |
4318 | ||
4319 | select_frame (fi, -1); | |
4320 | throw_addr = fi->pc; | |
4321 | ||
4322 | /* Go back to original (top) frame */ | |
4323 | select_frame (curr_frame, -1); | |
4324 | ||
4325 | current_ex_event.kind = (enum exception_event_kind) event_kind; | |
4326 | current_ex_event.throw_sal = find_pc_line (throw_addr, 1); | |
4327 | current_ex_event.catch_sal = find_pc_line (catch_addr, 1); | |
4328 | ||
4329 | return ¤t_ex_event; | |
4330 | } | |
4331 | ||
c906108c SS |
4332 | static void |
4333 | unwind_command (exp, from_tty) | |
4334 | char *exp; | |
4335 | int from_tty; | |
4336 | { | |
4337 | CORE_ADDR address; | |
4338 | struct unwind_table_entry *u; | |
4339 | ||
4340 | /* If we have an expression, evaluate it and use it as the address. */ | |
4341 | ||
4342 | if (exp != 0 && *exp != 0) | |
4343 | address = parse_and_eval_address (exp); | |
4344 | else | |
4345 | return; | |
4346 | ||
4347 | u = find_unwind_entry (address); | |
4348 | ||
4349 | if (!u) | |
4350 | { | |
4351 | printf_unfiltered ("Can't find unwind table entry for %s\n", exp); | |
4352 | return; | |
4353 | } | |
4354 | ||
4355 | printf_unfiltered ("unwind_table_entry (0x%x):\n", u); | |
4356 | ||
4357 | printf_unfiltered ("\tregion_start = "); | |
4358 | print_address (u->region_start, gdb_stdout); | |
4359 | ||
4360 | printf_unfiltered ("\n\tregion_end = "); | |
4361 | print_address (u->region_end, gdb_stdout); | |
4362 | ||
4363 | #ifdef __STDC__ | |
4364 | #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD); | |
4365 | #else | |
4366 | #define pif(FLD) if (u->FLD) printf_unfiltered (" FLD"); | |
4367 | #endif | |
4368 | ||
4369 | printf_unfiltered ("\n\tflags ="); | |
4370 | pif (Cannot_unwind); | |
4371 | pif (Millicode); | |
4372 | pif (Millicode_save_sr0); | |
4373 | pif (Entry_SR); | |
4374 | pif (Args_stored); | |
4375 | pif (Variable_Frame); | |
4376 | pif (Separate_Package_Body); | |
4377 | pif (Frame_Extension_Millicode); | |
4378 | pif (Stack_Overflow_Check); | |
4379 | pif (Two_Instruction_SP_Increment); | |
4380 | pif (Ada_Region); | |
4381 | pif (Save_SP); | |
4382 | pif (Save_RP); | |
4383 | pif (Save_MRP_in_frame); | |
4384 | pif (extn_ptr_defined); | |
4385 | pif (Cleanup_defined); | |
4386 | pif (MPE_XL_interrupt_marker); | |
4387 | pif (HP_UX_interrupt_marker); | |
4388 | pif (Large_frame); | |
4389 | ||
4390 | putchar_unfiltered ('\n'); | |
4391 | ||
4392 | #ifdef __STDC__ | |
4393 | #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD); | |
4394 | #else | |
4395 | #define pin(FLD) printf_unfiltered ("\tFLD = 0x%x\n", u->FLD); | |
4396 | #endif | |
4397 | ||
4398 | pin (Region_description); | |
4399 | pin (Entry_FR); | |
4400 | pin (Entry_GR); | |
4401 | pin (Total_frame_size); | |
4402 | } | |
c906108c SS |
4403 | |
4404 | #ifdef PREPARE_TO_PROCEED | |
4405 | ||
4406 | /* If the user has switched threads, and there is a breakpoint | |
4407 | at the old thread's pc location, then switch to that thread | |
4408 | and return TRUE, else return FALSE and don't do a thread | |
4409 | switch (or rather, don't seem to have done a thread switch). | |
4410 | ||
4411 | Ptrace-based gdb will always return FALSE to the thread-switch | |
4412 | query, and thus also to PREPARE_TO_PROCEED. | |
4413 | ||
4414 | The important thing is whether there is a BPT instruction, | |
4415 | not how many user breakpoints there are. So we have to worry | |
4416 | about things like these: | |
4417 | ||
4418 | o Non-bp stop -- NO | |
4419 | ||
4420 | o User hits bp, no switch -- NO | |
4421 | ||
4422 | o User hits bp, switches threads -- YES | |
4423 | ||
4424 | o User hits bp, deletes bp, switches threads -- NO | |
4425 | ||
4426 | o User hits bp, deletes one of two or more bps | |
c5aa993b | 4427 | at that PC, user switches threads -- YES |
c906108c SS |
4428 | |
4429 | o Plus, since we're buffering events, the user may have hit a | |
c5aa993b JM |
4430 | breakpoint, deleted the breakpoint and then gotten another |
4431 | hit on that same breakpoint on another thread which | |
4432 | actually hit before the delete. (FIXME in breakpoint.c | |
4433 | so that "dead" breakpoints are ignored?) -- NO | |
c906108c SS |
4434 | |
4435 | For these reasons, we have to violate information hiding and | |
4436 | call "breakpoint_here_p". If core gdb thinks there is a bpt | |
4437 | here, that's what counts, as core gdb is the one which is | |
4438 | putting the BPT instruction in and taking it out. */ | |
4439 | int | |
c5aa993b | 4440 | hppa_prepare_to_proceed () |
c906108c SS |
4441 | { |
4442 | pid_t old_thread; | |
4443 | pid_t current_thread; | |
4444 | ||
c5aa993b | 4445 | old_thread = hppa_switched_threads (inferior_pid); |
c906108c SS |
4446 | if (old_thread != 0) |
4447 | { | |
4448 | /* Switched over from "old_thread". Try to do | |
4449 | as little work as possible, 'cause mostly | |
4450 | we're going to switch back. */ | |
4451 | CORE_ADDR new_pc; | |
c5aa993b | 4452 | CORE_ADDR old_pc = read_pc (); |
c906108c SS |
4453 | |
4454 | /* Yuk, shouldn't use global to specify current | |
4455 | thread. But that's how gdb does it. */ | |
4456 | current_thread = inferior_pid; | |
c5aa993b | 4457 | inferior_pid = old_thread; |
c906108c | 4458 | |
c5aa993b JM |
4459 | new_pc = read_pc (); |
4460 | if (new_pc != old_pc /* If at same pc, no need */ | |
c906108c | 4461 | && breakpoint_here_p (new_pc)) |
c5aa993b | 4462 | { |
c906108c | 4463 | /* User hasn't deleted the BP. |
c5aa993b | 4464 | Return TRUE, finishing switch to "old_thread". */ |
c906108c SS |
4465 | flush_cached_frames (); |
4466 | registers_changed (); | |
4467 | #if 0 | |
c5aa993b | 4468 | printf ("---> PREPARE_TO_PROCEED (was %d, now %d)!\n", |
c906108c SS |
4469 | current_thread, inferior_pid); |
4470 | #endif | |
c5aa993b | 4471 | |
c906108c | 4472 | return 1; |
c5aa993b | 4473 | } |
c906108c SS |
4474 | |
4475 | /* Otherwise switch back to the user-chosen thread. */ | |
4476 | inferior_pid = current_thread; | |
c5aa993b | 4477 | new_pc = read_pc (); /* Re-prime register cache */ |
c906108c SS |
4478 | } |
4479 | ||
4480 | return 0; | |
4481 | } | |
4482 | #endif /* PREPARE_TO_PROCEED */ | |
4483 | ||
4484 | void | |
4485 | _initialize_hppa_tdep () | |
4486 | { | |
4487 | tm_print_insn = print_insn_hppa; | |
4488 | ||
c906108c SS |
4489 | add_cmd ("unwind", class_maintenance, unwind_command, |
4490 | "Print unwind table entry at given address.", | |
4491 | &maintenanceprintlist); | |
c906108c | 4492 | } |