Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the HP PA architecture, for GDB. |
cda5a58a AC |
2 | |
3 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, | |
4 | 1996, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. | |
c906108c SS |
5 | |
6 | Contributed by the Center for Software Science at the | |
7 | University of Utah (pa-gdb-bugs@cs.utah.edu). | |
8 | ||
c5aa993b | 9 | This file is part of GDB. |
c906108c | 10 | |
c5aa993b JM |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2 of the License, or | |
14 | (at your option) any later version. | |
c906108c | 15 | |
c5aa993b JM |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
c906108c | 20 | |
c5aa993b JM |
21 | You should have received a copy of the GNU General Public License |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
25 | |
26 | #include "defs.h" | |
27 | #include "frame.h" | |
28 | #include "bfd.h" | |
29 | #include "inferior.h" | |
30 | #include "value.h" | |
4e052eda | 31 | #include "regcache.h" |
e5d66720 | 32 | #include "completer.h" |
c906108c SS |
33 | |
34 | /* For argument passing to the inferior */ | |
35 | #include "symtab.h" | |
36 | ||
37 | #ifdef USG | |
38 | #include <sys/types.h> | |
39 | #endif | |
40 | ||
41 | #include <dl.h> | |
42 | #include <sys/param.h> | |
43 | #include <signal.h> | |
44 | ||
45 | #include <sys/ptrace.h> | |
46 | #include <machine/save_state.h> | |
47 | ||
48 | #ifdef COFF_ENCAPSULATE | |
49 | #include "a.out.encap.h" | |
50 | #else | |
51 | #endif | |
52 | ||
c5aa993b | 53 | /*#include <sys/user.h> After a.out.h */ |
c906108c SS |
54 | #include <sys/file.h> |
55 | #include "gdb_stat.h" | |
03f2053f | 56 | #include "gdb_wait.h" |
c906108c SS |
57 | |
58 | #include "gdbcore.h" | |
59 | #include "gdbcmd.h" | |
60 | #include "target.h" | |
61 | #include "symfile.h" | |
62 | #include "objfiles.h" | |
63 | ||
c906108c SS |
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 | |
a14ed312 | 69 | static int extract_5_load (unsigned int); |
c906108c | 70 | |
a14ed312 | 71 | static unsigned extract_5R_store (unsigned int); |
c906108c | 72 | |
a14ed312 | 73 | static unsigned extract_5r_store (unsigned int); |
c906108c | 74 | |
a14ed312 KB |
75 | static void find_dummy_frame_regs (struct frame_info *, |
76 | struct frame_saved_regs *); | |
c906108c | 77 | |
a14ed312 | 78 | static int find_proc_framesize (CORE_ADDR); |
c906108c | 79 | |
a14ed312 | 80 | static int find_return_regnum (CORE_ADDR); |
c906108c | 81 | |
a14ed312 | 82 | struct unwind_table_entry *find_unwind_entry (CORE_ADDR); |
c906108c | 83 | |
a14ed312 | 84 | static int extract_17 (unsigned int); |
c906108c | 85 | |
a14ed312 | 86 | static unsigned deposit_21 (unsigned int, unsigned int); |
c906108c | 87 | |
a14ed312 | 88 | static int extract_21 (unsigned); |
c906108c | 89 | |
a14ed312 | 90 | static unsigned deposit_14 (int, unsigned int); |
c906108c | 91 | |
a14ed312 | 92 | static int extract_14 (unsigned); |
c906108c | 93 | |
a14ed312 | 94 | static void unwind_command (char *, int); |
c906108c | 95 | |
a14ed312 | 96 | static int low_sign_extend (unsigned int, unsigned int); |
c906108c | 97 | |
a14ed312 | 98 | static int sign_extend (unsigned int, unsigned int); |
c906108c | 99 | |
a14ed312 | 100 | static int restore_pc_queue (struct frame_saved_regs *); |
c906108c | 101 | |
a14ed312 | 102 | static int hppa_alignof (struct type *); |
c906108c SS |
103 | |
104 | /* To support multi-threading and stepping. */ | |
a14ed312 | 105 | int hppa_prepare_to_proceed (); |
c906108c | 106 | |
a14ed312 | 107 | static int prologue_inst_adjust_sp (unsigned long); |
c906108c | 108 | |
a14ed312 | 109 | static int is_branch (unsigned long); |
c906108c | 110 | |
a14ed312 | 111 | static int inst_saves_gr (unsigned long); |
c906108c | 112 | |
a14ed312 | 113 | static int inst_saves_fr (unsigned long); |
c906108c | 114 | |
a14ed312 | 115 | static int pc_in_interrupt_handler (CORE_ADDR); |
c906108c | 116 | |
a14ed312 | 117 | static int pc_in_linker_stub (CORE_ADDR); |
c906108c | 118 | |
a14ed312 | 119 | static int compare_unwind_entries (const void *, const void *); |
c906108c | 120 | |
a14ed312 | 121 | static void read_unwind_info (struct objfile *); |
c906108c | 122 | |
a14ed312 KB |
123 | static void internalize_unwinds (struct objfile *, |
124 | struct unwind_table_entry *, | |
125 | asection *, unsigned int, | |
126 | unsigned int, CORE_ADDR); | |
127 | static void pa_print_registers (char *, int, int); | |
d9fcf2fb | 128 | static void pa_strcat_registers (char *, int, int, struct ui_file *); |
a14ed312 KB |
129 | static void pa_register_look_aside (char *, int, long *); |
130 | static void pa_print_fp_reg (int); | |
d9fcf2fb | 131 | static void pa_strcat_fp_reg (int, struct ui_file *, enum precision_type); |
a14ed312 | 132 | static void record_text_segment_lowaddr (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. */ | |
ea7c478f | 153 | extern struct value *find_function_in_inferior (char *); |
c906108c SS |
154 | |
155 | /* Should call_function allocate stack space for a struct return? */ | |
156 | int | |
fba45db2 | 157 | hppa_use_struct_convention (int gcc_p, struct type *type) |
c906108c | 158 | { |
104c1213 | 159 | return (TYPE_LENGTH (type) > 2 * REGISTER_SIZE); |
c906108c | 160 | } |
c906108c | 161 | \f |
c5aa993b | 162 | |
c906108c SS |
163 | /* Routines to extract various sized constants out of hppa |
164 | instructions. */ | |
165 | ||
166 | /* This assumes that no garbage lies outside of the lower bits of | |
167 | value. */ | |
168 | ||
169 | static int | |
fba45db2 | 170 | sign_extend (unsigned val, unsigned bits) |
c906108c | 171 | { |
c5aa993b | 172 | return (int) (val >> (bits - 1) ? (-1 << bits) | val : val); |
c906108c SS |
173 | } |
174 | ||
175 | /* For many immediate values the sign bit is the low bit! */ | |
176 | ||
177 | static int | |
fba45db2 | 178 | low_sign_extend (unsigned val, unsigned bits) |
c906108c | 179 | { |
c5aa993b | 180 | return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1); |
c906108c SS |
181 | } |
182 | ||
183 | /* extract the immediate field from a ld{bhw}s instruction */ | |
184 | ||
c906108c | 185 | static int |
fba45db2 | 186 | extract_5_load (unsigned word) |
c906108c SS |
187 | { |
188 | return low_sign_extend (word >> 16 & MASK_5, 5); | |
189 | } | |
190 | ||
c906108c SS |
191 | /* extract the immediate field from a break instruction */ |
192 | ||
193 | static unsigned | |
fba45db2 | 194 | extract_5r_store (unsigned word) |
c906108c SS |
195 | { |
196 | return (word & MASK_5); | |
197 | } | |
198 | ||
199 | /* extract the immediate field from a {sr}sm instruction */ | |
200 | ||
201 | static unsigned | |
fba45db2 | 202 | extract_5R_store (unsigned word) |
c906108c SS |
203 | { |
204 | return (word >> 16 & MASK_5); | |
205 | } | |
206 | ||
c906108c SS |
207 | /* extract a 14 bit immediate field */ |
208 | ||
209 | static int | |
fba45db2 | 210 | extract_14 (unsigned word) |
c906108c SS |
211 | { |
212 | return low_sign_extend (word & MASK_14, 14); | |
213 | } | |
214 | ||
215 | /* deposit a 14 bit constant in a word */ | |
216 | ||
217 | static unsigned | |
fba45db2 | 218 | deposit_14 (int opnd, unsigned word) |
c906108c SS |
219 | { |
220 | unsigned sign = (opnd < 0 ? 1 : 0); | |
221 | ||
c5aa993b | 222 | return word | ((unsigned) opnd << 1 & MASK_14) | sign; |
c906108c SS |
223 | } |
224 | ||
225 | /* extract a 21 bit constant */ | |
226 | ||
227 | static int | |
fba45db2 | 228 | extract_21 (unsigned word) |
c906108c SS |
229 | { |
230 | int val; | |
231 | ||
232 | word &= MASK_21; | |
233 | word <<= 11; | |
234 | val = GET_FIELD (word, 20, 20); | |
235 | val <<= 11; | |
236 | val |= GET_FIELD (word, 9, 19); | |
237 | val <<= 2; | |
238 | val |= GET_FIELD (word, 5, 6); | |
239 | val <<= 5; | |
240 | val |= GET_FIELD (word, 0, 4); | |
241 | val <<= 2; | |
242 | val |= GET_FIELD (word, 7, 8); | |
243 | return sign_extend (val, 21) << 11; | |
244 | } | |
245 | ||
246 | /* deposit a 21 bit constant in a word. Although 21 bit constants are | |
247 | usually the top 21 bits of a 32 bit constant, we assume that only | |
248 | the low 21 bits of opnd are relevant */ | |
249 | ||
250 | static unsigned | |
fba45db2 | 251 | deposit_21 (unsigned opnd, unsigned word) |
c906108c SS |
252 | { |
253 | unsigned val = 0; | |
254 | ||
255 | val |= GET_FIELD (opnd, 11 + 14, 11 + 18); | |
256 | val <<= 2; | |
257 | val |= GET_FIELD (opnd, 11 + 12, 11 + 13); | |
258 | val <<= 2; | |
259 | val |= GET_FIELD (opnd, 11 + 19, 11 + 20); | |
260 | val <<= 11; | |
261 | val |= GET_FIELD (opnd, 11 + 1, 11 + 11); | |
262 | val <<= 1; | |
263 | val |= GET_FIELD (opnd, 11 + 0, 11 + 0); | |
264 | return word | val; | |
265 | } | |
266 | ||
c906108c SS |
267 | /* extract a 17 bit constant from branch instructions, returning the |
268 | 19 bit signed value. */ | |
269 | ||
270 | static int | |
fba45db2 | 271 | extract_17 (unsigned word) |
c906108c SS |
272 | { |
273 | return sign_extend (GET_FIELD (word, 19, 28) | | |
274 | GET_FIELD (word, 29, 29) << 10 | | |
275 | GET_FIELD (word, 11, 15) << 11 | | |
276 | (word & 0x1) << 16, 17) << 2; | |
277 | } | |
278 | \f | |
279 | ||
280 | /* Compare the start address for two unwind entries returning 1 if | |
281 | the first address is larger than the second, -1 if the second is | |
282 | larger than the first, and zero if they are equal. */ | |
283 | ||
284 | static int | |
fba45db2 | 285 | compare_unwind_entries (const void *arg1, const void *arg2) |
c906108c SS |
286 | { |
287 | const struct unwind_table_entry *a = arg1; | |
288 | const struct unwind_table_entry *b = arg2; | |
289 | ||
290 | if (a->region_start > b->region_start) | |
291 | return 1; | |
292 | else if (a->region_start < b->region_start) | |
293 | return -1; | |
294 | else | |
295 | return 0; | |
296 | } | |
297 | ||
53a5351d JM |
298 | static CORE_ADDR low_text_segment_address; |
299 | ||
300 | static void | |
8fef05cc | 301 | record_text_segment_lowaddr (bfd *abfd, asection *section, void *ignored) |
53a5351d JM |
302 | { |
303 | if ((section->flags & (SEC_ALLOC | SEC_LOAD | SEC_READONLY) | |
304 | == (SEC_ALLOC | SEC_LOAD | SEC_READONLY)) | |
305 | && section->vma < low_text_segment_address) | |
306 | low_text_segment_address = section->vma; | |
307 | } | |
308 | ||
c906108c | 309 | static void |
fba45db2 KB |
310 | internalize_unwinds (struct objfile *objfile, struct unwind_table_entry *table, |
311 | asection *section, unsigned int entries, unsigned int size, | |
312 | CORE_ADDR text_offset) | |
c906108c SS |
313 | { |
314 | /* We will read the unwind entries into temporary memory, then | |
315 | fill in the actual unwind table. */ | |
316 | if (size > 0) | |
317 | { | |
318 | unsigned long tmp; | |
319 | unsigned i; | |
320 | char *buf = alloca (size); | |
321 | ||
53a5351d JM |
322 | low_text_segment_address = -1; |
323 | ||
324 | /* If addresses are 64 bits wide, then unwinds are supposed to | |
c2c6d25f JM |
325 | be segment relative offsets instead of absolute addresses. |
326 | ||
327 | Note that when loading a shared library (text_offset != 0) the | |
328 | unwinds are already relative to the text_offset that will be | |
329 | passed in. */ | |
330 | if (TARGET_PTR_BIT == 64 && text_offset == 0) | |
53a5351d JM |
331 | { |
332 | bfd_map_over_sections (objfile->obfd, | |
333 | record_text_segment_lowaddr, (PTR) NULL); | |
334 | ||
335 | /* ?!? Mask off some low bits. Should this instead subtract | |
336 | out the lowest section's filepos or something like that? | |
337 | This looks very hokey to me. */ | |
338 | low_text_segment_address &= ~0xfff; | |
339 | text_offset += low_text_segment_address; | |
340 | } | |
341 | ||
c906108c SS |
342 | bfd_get_section_contents (objfile->obfd, section, buf, 0, size); |
343 | ||
344 | /* Now internalize the information being careful to handle host/target | |
c5aa993b | 345 | endian issues. */ |
c906108c SS |
346 | for (i = 0; i < entries; i++) |
347 | { | |
348 | table[i].region_start = bfd_get_32 (objfile->obfd, | |
c5aa993b | 349 | (bfd_byte *) buf); |
c906108c SS |
350 | table[i].region_start += text_offset; |
351 | buf += 4; | |
c5aa993b | 352 | table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
353 | table[i].region_end += text_offset; |
354 | buf += 4; | |
c5aa993b | 355 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
356 | buf += 4; |
357 | table[i].Cannot_unwind = (tmp >> 31) & 0x1; | |
358 | table[i].Millicode = (tmp >> 30) & 0x1; | |
359 | table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1; | |
360 | table[i].Region_description = (tmp >> 27) & 0x3; | |
361 | table[i].reserved1 = (tmp >> 26) & 0x1; | |
362 | table[i].Entry_SR = (tmp >> 25) & 0x1; | |
363 | table[i].Entry_FR = (tmp >> 21) & 0xf; | |
364 | table[i].Entry_GR = (tmp >> 16) & 0x1f; | |
365 | table[i].Args_stored = (tmp >> 15) & 0x1; | |
366 | table[i].Variable_Frame = (tmp >> 14) & 0x1; | |
367 | table[i].Separate_Package_Body = (tmp >> 13) & 0x1; | |
368 | table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1; | |
369 | table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1; | |
370 | table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1; | |
371 | table[i].Ada_Region = (tmp >> 9) & 0x1; | |
372 | table[i].cxx_info = (tmp >> 8) & 0x1; | |
373 | table[i].cxx_try_catch = (tmp >> 7) & 0x1; | |
374 | table[i].sched_entry_seq = (tmp >> 6) & 0x1; | |
375 | table[i].reserved2 = (tmp >> 5) & 0x1; | |
376 | table[i].Save_SP = (tmp >> 4) & 0x1; | |
377 | table[i].Save_RP = (tmp >> 3) & 0x1; | |
378 | table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1; | |
379 | table[i].extn_ptr_defined = (tmp >> 1) & 0x1; | |
380 | table[i].Cleanup_defined = tmp & 0x1; | |
c5aa993b | 381 | tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf); |
c906108c SS |
382 | buf += 4; |
383 | table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1; | |
384 | table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1; | |
385 | table[i].Large_frame = (tmp >> 29) & 0x1; | |
386 | table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1; | |
387 | table[i].reserved4 = (tmp >> 27) & 0x1; | |
388 | table[i].Total_frame_size = tmp & 0x7ffffff; | |
389 | ||
c5aa993b | 390 | /* Stub unwinds are handled elsewhere. */ |
c906108c SS |
391 | table[i].stub_unwind.stub_type = 0; |
392 | table[i].stub_unwind.padding = 0; | |
393 | } | |
394 | } | |
395 | } | |
396 | ||
397 | /* Read in the backtrace information stored in the `$UNWIND_START$' section of | |
398 | the object file. This info is used mainly by find_unwind_entry() to find | |
399 | out the stack frame size and frame pointer used by procedures. We put | |
400 | everything on the psymbol obstack in the objfile so that it automatically | |
401 | gets freed when the objfile is destroyed. */ | |
402 | ||
403 | static void | |
fba45db2 | 404 | read_unwind_info (struct objfile *objfile) |
c906108c | 405 | { |
d4f3574e SS |
406 | asection *unwind_sec, *stub_unwind_sec; |
407 | unsigned unwind_size, stub_unwind_size, total_size; | |
408 | unsigned index, unwind_entries; | |
c906108c SS |
409 | unsigned stub_entries, total_entries; |
410 | CORE_ADDR text_offset; | |
411 | struct obj_unwind_info *ui; | |
412 | obj_private_data_t *obj_private; | |
413 | ||
414 | text_offset = ANOFFSET (objfile->section_offsets, 0); | |
c5aa993b JM |
415 | ui = (struct obj_unwind_info *) obstack_alloc (&objfile->psymbol_obstack, |
416 | sizeof (struct obj_unwind_info)); | |
c906108c SS |
417 | |
418 | ui->table = NULL; | |
419 | ui->cache = NULL; | |
420 | ui->last = -1; | |
421 | ||
d4f3574e SS |
422 | /* For reasons unknown the HP PA64 tools generate multiple unwinder |
423 | sections in a single executable. So we just iterate over every | |
424 | section in the BFD looking for unwinder sections intead of trying | |
425 | to do a lookup with bfd_get_section_by_name. | |
c906108c | 426 | |
d4f3574e SS |
427 | First determine the total size of the unwind tables so that we |
428 | can allocate memory in a nice big hunk. */ | |
429 | total_entries = 0; | |
430 | for (unwind_sec = objfile->obfd->sections; | |
431 | unwind_sec; | |
432 | unwind_sec = unwind_sec->next) | |
c906108c | 433 | { |
d4f3574e SS |
434 | if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0 |
435 | || strcmp (unwind_sec->name, ".PARISC.unwind") == 0) | |
436 | { | |
437 | unwind_size = bfd_section_size (objfile->obfd, unwind_sec); | |
438 | unwind_entries = unwind_size / UNWIND_ENTRY_SIZE; | |
c906108c | 439 | |
d4f3574e SS |
440 | total_entries += unwind_entries; |
441 | } | |
c906108c SS |
442 | } |
443 | ||
d4f3574e SS |
444 | /* Now compute the size of the stub unwinds. Note the ELF tools do not |
445 | use stub unwinds at the curren time. */ | |
446 | stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$"); | |
447 | ||
c906108c SS |
448 | if (stub_unwind_sec) |
449 | { | |
450 | stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec); | |
451 | stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE; | |
452 | } | |
453 | else | |
454 | { | |
455 | stub_unwind_size = 0; | |
456 | stub_entries = 0; | |
457 | } | |
458 | ||
459 | /* Compute total number of unwind entries and their total size. */ | |
d4f3574e | 460 | total_entries += stub_entries; |
c906108c SS |
461 | total_size = total_entries * sizeof (struct unwind_table_entry); |
462 | ||
463 | /* Allocate memory for the unwind table. */ | |
464 | ui->table = (struct unwind_table_entry *) | |
465 | obstack_alloc (&objfile->psymbol_obstack, total_size); | |
c5aa993b | 466 | ui->last = total_entries - 1; |
c906108c | 467 | |
d4f3574e SS |
468 | /* Now read in each unwind section and internalize the standard unwind |
469 | entries. */ | |
c906108c | 470 | index = 0; |
d4f3574e SS |
471 | for (unwind_sec = objfile->obfd->sections; |
472 | unwind_sec; | |
473 | unwind_sec = unwind_sec->next) | |
474 | { | |
475 | if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0 | |
476 | || strcmp (unwind_sec->name, ".PARISC.unwind") == 0) | |
477 | { | |
478 | unwind_size = bfd_section_size (objfile->obfd, unwind_sec); | |
479 | unwind_entries = unwind_size / UNWIND_ENTRY_SIZE; | |
480 | ||
481 | internalize_unwinds (objfile, &ui->table[index], unwind_sec, | |
482 | unwind_entries, unwind_size, text_offset); | |
483 | index += unwind_entries; | |
484 | } | |
485 | } | |
486 | ||
487 | /* Now read in and internalize the stub unwind entries. */ | |
c906108c SS |
488 | if (stub_unwind_size > 0) |
489 | { | |
490 | unsigned int i; | |
491 | char *buf = alloca (stub_unwind_size); | |
492 | ||
493 | /* Read in the stub unwind entries. */ | |
494 | bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf, | |
495 | 0, stub_unwind_size); | |
496 | ||
497 | /* Now convert them into regular unwind entries. */ | |
498 | for (i = 0; i < stub_entries; i++, index++) | |
499 | { | |
500 | /* Clear out the next unwind entry. */ | |
501 | memset (&ui->table[index], 0, sizeof (struct unwind_table_entry)); | |
502 | ||
503 | /* Convert offset & size into region_start and region_end. | |
504 | Stuff away the stub type into "reserved" fields. */ | |
505 | ui->table[index].region_start = bfd_get_32 (objfile->obfd, | |
506 | (bfd_byte *) buf); | |
507 | ui->table[index].region_start += text_offset; | |
508 | buf += 4; | |
509 | ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd, | |
c5aa993b | 510 | (bfd_byte *) buf); |
c906108c SS |
511 | buf += 2; |
512 | ui->table[index].region_end | |
c5aa993b JM |
513 | = ui->table[index].region_start + 4 * |
514 | (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1); | |
c906108c SS |
515 | buf += 2; |
516 | } | |
517 | ||
518 | } | |
519 | ||
520 | /* Unwind table needs to be kept sorted. */ | |
521 | qsort (ui->table, total_entries, sizeof (struct unwind_table_entry), | |
522 | compare_unwind_entries); | |
523 | ||
524 | /* Keep a pointer to the unwind information. */ | |
c5aa993b | 525 | if (objfile->obj_private == NULL) |
c906108c SS |
526 | { |
527 | obj_private = (obj_private_data_t *) | |
c5aa993b JM |
528 | obstack_alloc (&objfile->psymbol_obstack, |
529 | sizeof (obj_private_data_t)); | |
c906108c | 530 | obj_private->unwind_info = NULL; |
c5aa993b | 531 | obj_private->so_info = NULL; |
53a5351d | 532 | obj_private->dp = 0; |
c5aa993b | 533 | |
c906108c SS |
534 | objfile->obj_private = (PTR) obj_private; |
535 | } | |
c5aa993b | 536 | obj_private = (obj_private_data_t *) objfile->obj_private; |
c906108c SS |
537 | obj_private->unwind_info = ui; |
538 | } | |
539 | ||
540 | /* Lookup the unwind (stack backtrace) info for the given PC. We search all | |
541 | of the objfiles seeking the unwind table entry for this PC. Each objfile | |
542 | contains a sorted list of struct unwind_table_entry. Since we do a binary | |
543 | search of the unwind tables, we depend upon them to be sorted. */ | |
544 | ||
545 | struct unwind_table_entry * | |
fba45db2 | 546 | find_unwind_entry (CORE_ADDR pc) |
c906108c SS |
547 | { |
548 | int first, middle, last; | |
549 | struct objfile *objfile; | |
550 | ||
551 | /* A function at address 0? Not in HP-UX! */ | |
552 | if (pc == (CORE_ADDR) 0) | |
553 | return NULL; | |
554 | ||
555 | ALL_OBJFILES (objfile) | |
c5aa993b JM |
556 | { |
557 | struct obj_unwind_info *ui; | |
558 | ui = NULL; | |
559 | if (objfile->obj_private) | |
560 | ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info; | |
c906108c | 561 | |
c5aa993b JM |
562 | if (!ui) |
563 | { | |
564 | read_unwind_info (objfile); | |
565 | if (objfile->obj_private == NULL) | |
104c1213 | 566 | error ("Internal error reading unwind information."); |
c5aa993b JM |
567 | ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info; |
568 | } | |
c906108c | 569 | |
c5aa993b | 570 | /* First, check the cache */ |
c906108c | 571 | |
c5aa993b JM |
572 | if (ui->cache |
573 | && pc >= ui->cache->region_start | |
574 | && pc <= ui->cache->region_end) | |
575 | return ui->cache; | |
c906108c | 576 | |
c5aa993b | 577 | /* Not in the cache, do a binary search */ |
c906108c | 578 | |
c5aa993b JM |
579 | first = 0; |
580 | last = ui->last; | |
c906108c | 581 | |
c5aa993b JM |
582 | while (first <= last) |
583 | { | |
584 | middle = (first + last) / 2; | |
585 | if (pc >= ui->table[middle].region_start | |
586 | && pc <= ui->table[middle].region_end) | |
587 | { | |
588 | ui->cache = &ui->table[middle]; | |
589 | return &ui->table[middle]; | |
590 | } | |
c906108c | 591 | |
c5aa993b JM |
592 | if (pc < ui->table[middle].region_start) |
593 | last = middle - 1; | |
594 | else | |
595 | first = middle + 1; | |
596 | } | |
597 | } /* ALL_OBJFILES() */ | |
c906108c SS |
598 | return NULL; |
599 | } | |
600 | ||
601 | /* Return the adjustment necessary to make for addresses on the stack | |
602 | as presented by hpread.c. | |
603 | ||
604 | This is necessary because of the stack direction on the PA and the | |
605 | bizarre way in which someone (?) decided they wanted to handle | |
606 | frame pointerless code in GDB. */ | |
607 | int | |
fba45db2 | 608 | hpread_adjust_stack_address (CORE_ADDR func_addr) |
c906108c SS |
609 | { |
610 | struct unwind_table_entry *u; | |
611 | ||
612 | u = find_unwind_entry (func_addr); | |
613 | if (!u) | |
614 | return 0; | |
615 | else | |
616 | return u->Total_frame_size << 3; | |
617 | } | |
618 | ||
619 | /* Called to determine if PC is in an interrupt handler of some | |
620 | kind. */ | |
621 | ||
622 | static int | |
fba45db2 | 623 | pc_in_interrupt_handler (CORE_ADDR pc) |
c906108c SS |
624 | { |
625 | struct unwind_table_entry *u; | |
626 | struct minimal_symbol *msym_us; | |
627 | ||
628 | u = find_unwind_entry (pc); | |
629 | if (!u) | |
630 | return 0; | |
631 | ||
632 | /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though | |
633 | its frame isn't a pure interrupt frame. Deal with this. */ | |
634 | msym_us = lookup_minimal_symbol_by_pc (pc); | |
635 | ||
636 | return u->HP_UX_interrupt_marker && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)); | |
637 | } | |
638 | ||
639 | /* Called when no unwind descriptor was found for PC. Returns 1 if it | |
104c1213 JM |
640 | appears that PC is in a linker stub. |
641 | ||
642 | ?!? Need to handle stubs which appear in PA64 code. */ | |
c906108c SS |
643 | |
644 | static int | |
fba45db2 | 645 | pc_in_linker_stub (CORE_ADDR pc) |
c906108c SS |
646 | { |
647 | int found_magic_instruction = 0; | |
648 | int i; | |
649 | char buf[4]; | |
650 | ||
651 | /* If unable to read memory, assume pc is not in a linker stub. */ | |
652 | if (target_read_memory (pc, buf, 4) != 0) | |
653 | return 0; | |
654 | ||
655 | /* We are looking for something like | |
656 | ||
657 | ; $$dyncall jams RP into this special spot in the frame (RP') | |
658 | ; before calling the "call stub" | |
659 | ldw -18(sp),rp | |
660 | ||
661 | ldsid (rp),r1 ; Get space associated with RP into r1 | |
662 | mtsp r1,sp ; Move it into space register 0 | |
663 | be,n 0(sr0),rp) ; back to your regularly scheduled program */ | |
664 | ||
665 | /* Maximum known linker stub size is 4 instructions. Search forward | |
666 | from the given PC, then backward. */ | |
667 | for (i = 0; i < 4; i++) | |
668 | { | |
669 | /* If we hit something with an unwind, stop searching this direction. */ | |
670 | ||
671 | if (find_unwind_entry (pc + i * 4) != 0) | |
672 | break; | |
673 | ||
674 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
c5aa993b | 675 | return from a cross-space function call. */ |
c906108c SS |
676 | if (read_memory_integer (pc + i * 4, 4) == 0x004010a1) |
677 | { | |
678 | found_magic_instruction = 1; | |
679 | break; | |
680 | } | |
681 | /* Add code to handle long call/branch and argument relocation stubs | |
c5aa993b | 682 | here. */ |
c906108c SS |
683 | } |
684 | ||
685 | if (found_magic_instruction != 0) | |
686 | return 1; | |
687 | ||
688 | /* Now look backward. */ | |
689 | for (i = 0; i < 4; i++) | |
690 | { | |
691 | /* If we hit something with an unwind, stop searching this direction. */ | |
692 | ||
693 | if (find_unwind_entry (pc - i * 4) != 0) | |
694 | break; | |
695 | ||
696 | /* Check for ldsid (rp),r1 which is the magic instruction for a | |
c5aa993b | 697 | return from a cross-space function call. */ |
c906108c SS |
698 | if (read_memory_integer (pc - i * 4, 4) == 0x004010a1) |
699 | { | |
700 | found_magic_instruction = 1; | |
701 | break; | |
702 | } | |
703 | /* Add code to handle long call/branch and argument relocation stubs | |
c5aa993b | 704 | here. */ |
c906108c SS |
705 | } |
706 | return found_magic_instruction; | |
707 | } | |
708 | ||
709 | static int | |
fba45db2 | 710 | find_return_regnum (CORE_ADDR pc) |
c906108c SS |
711 | { |
712 | struct unwind_table_entry *u; | |
713 | ||
714 | u = find_unwind_entry (pc); | |
715 | ||
716 | if (!u) | |
717 | return RP_REGNUM; | |
718 | ||
719 | if (u->Millicode) | |
720 | return 31; | |
721 | ||
722 | return RP_REGNUM; | |
723 | } | |
724 | ||
725 | /* Return size of frame, or -1 if we should use a frame pointer. */ | |
726 | static int | |
fba45db2 | 727 | find_proc_framesize (CORE_ADDR pc) |
c906108c SS |
728 | { |
729 | struct unwind_table_entry *u; | |
730 | struct minimal_symbol *msym_us; | |
731 | ||
732 | /* This may indicate a bug in our callers... */ | |
c5aa993b | 733 | if (pc == (CORE_ADDR) 0) |
c906108c | 734 | return -1; |
c5aa993b | 735 | |
c906108c SS |
736 | u = find_unwind_entry (pc); |
737 | ||
738 | if (!u) | |
739 | { | |
740 | if (pc_in_linker_stub (pc)) | |
741 | /* Linker stubs have a zero size frame. */ | |
742 | return 0; | |
743 | else | |
744 | return -1; | |
745 | } | |
746 | ||
747 | msym_us = lookup_minimal_symbol_by_pc (pc); | |
748 | ||
749 | /* If Save_SP is set, and we're not in an interrupt or signal caller, | |
750 | then we have a frame pointer. Use it. */ | |
3fa41cdb JL |
751 | if (u->Save_SP |
752 | && !pc_in_interrupt_handler (pc) | |
753 | && msym_us | |
c906108c SS |
754 | && !IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us))) |
755 | return -1; | |
756 | ||
757 | return u->Total_frame_size << 3; | |
758 | } | |
759 | ||
760 | /* Return offset from sp at which rp is saved, or 0 if not saved. */ | |
a14ed312 | 761 | static int rp_saved (CORE_ADDR); |
c906108c SS |
762 | |
763 | static int | |
fba45db2 | 764 | rp_saved (CORE_ADDR pc) |
c906108c SS |
765 | { |
766 | struct unwind_table_entry *u; | |
767 | ||
768 | /* A function at, and thus a return PC from, address 0? Not in HP-UX! */ | |
769 | if (pc == (CORE_ADDR) 0) | |
770 | return 0; | |
771 | ||
772 | u = find_unwind_entry (pc); | |
773 | ||
774 | if (!u) | |
775 | { | |
776 | if (pc_in_linker_stub (pc)) | |
777 | /* This is the so-called RP'. */ | |
778 | return -24; | |
779 | else | |
780 | return 0; | |
781 | } | |
782 | ||
783 | if (u->Save_RP) | |
53a5351d | 784 | return (TARGET_PTR_BIT == 64 ? -16 : -20); |
c906108c SS |
785 | else if (u->stub_unwind.stub_type != 0) |
786 | { | |
787 | switch (u->stub_unwind.stub_type) | |
788 | { | |
789 | case EXPORT: | |
790 | case IMPORT: | |
791 | return -24; | |
792 | case PARAMETER_RELOCATION: | |
793 | return -8; | |
794 | default: | |
795 | return 0; | |
796 | } | |
797 | } | |
798 | else | |
799 | return 0; | |
800 | } | |
801 | \f | |
802 | int | |
fba45db2 | 803 | frameless_function_invocation (struct frame_info *frame) |
c906108c SS |
804 | { |
805 | struct unwind_table_entry *u; | |
806 | ||
807 | u = find_unwind_entry (frame->pc); | |
808 | ||
809 | if (u == 0) | |
810 | return 0; | |
811 | ||
812 | return (u->Total_frame_size == 0 && u->stub_unwind.stub_type == 0); | |
813 | } | |
814 | ||
815 | CORE_ADDR | |
fba45db2 | 816 | saved_pc_after_call (struct frame_info *frame) |
c906108c SS |
817 | { |
818 | int ret_regnum; | |
819 | CORE_ADDR pc; | |
820 | struct unwind_table_entry *u; | |
821 | ||
822 | ret_regnum = find_return_regnum (get_frame_pc (frame)); | |
823 | pc = read_register (ret_regnum) & ~0x3; | |
c5aa993b | 824 | |
c906108c SS |
825 | /* If PC is in a linker stub, then we need to dig the address |
826 | the stub will return to out of the stack. */ | |
827 | u = find_unwind_entry (pc); | |
828 | if (u && u->stub_unwind.stub_type != 0) | |
829 | return FRAME_SAVED_PC (frame); | |
830 | else | |
831 | return pc; | |
832 | } | |
833 | \f | |
834 | CORE_ADDR | |
fba45db2 | 835 | hppa_frame_saved_pc (struct frame_info *frame) |
c906108c SS |
836 | { |
837 | CORE_ADDR pc = get_frame_pc (frame); | |
838 | struct unwind_table_entry *u; | |
839 | CORE_ADDR old_pc; | |
c5aa993b JM |
840 | int spun_around_loop = 0; |
841 | int rp_offset = 0; | |
c906108c SS |
842 | |
843 | /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner | |
844 | at the base of the frame in an interrupt handler. Registers within | |
845 | are saved in the exact same order as GDB numbers registers. How | |
846 | convienent. */ | |
847 | if (pc_in_interrupt_handler (pc)) | |
53a5351d JM |
848 | return read_memory_integer (frame->frame + PC_REGNUM * 4, |
849 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c | 850 | |
104c1213 JM |
851 | if ((frame->pc >= frame->frame |
852 | && frame->pc <= (frame->frame | |
853 | /* A call dummy is sized in words, but it is | |
854 | actually a series of instructions. Account | |
855 | for that scaling factor. */ | |
856 | + ((REGISTER_SIZE / INSTRUCTION_SIZE) | |
857 | * CALL_DUMMY_LENGTH) | |
858 | /* Similarly we have to account for 64bit | |
859 | wide register saves. */ | |
860 | + (32 * REGISTER_SIZE) | |
861 | /* We always consider FP regs 8 bytes long. */ | |
862 | + (NUM_REGS - FP0_REGNUM) * 8 | |
863 | /* Similarly we have to account for 64bit | |
864 | wide register saves. */ | |
865 | + (6 * REGISTER_SIZE)))) | |
866 | { | |
867 | return read_memory_integer ((frame->frame | |
868 | + (TARGET_PTR_BIT == 64 ? -16 : -20)), | |
869 | TARGET_PTR_BIT / 8) & ~0x3; | |
870 | } | |
871 | ||
c906108c SS |
872 | #ifdef FRAME_SAVED_PC_IN_SIGTRAMP |
873 | /* Deal with signal handler caller frames too. */ | |
874 | if (frame->signal_handler_caller) | |
875 | { | |
876 | CORE_ADDR rp; | |
877 | FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp); | |
878 | return rp & ~0x3; | |
879 | } | |
880 | #endif | |
881 | ||
882 | if (frameless_function_invocation (frame)) | |
883 | { | |
884 | int ret_regnum; | |
885 | ||
886 | ret_regnum = find_return_regnum (pc); | |
887 | ||
888 | /* If the next frame is an interrupt frame or a signal | |
c5aa993b JM |
889 | handler caller, then we need to look in the saved |
890 | register area to get the return pointer (the values | |
891 | in the registers may not correspond to anything useful). */ | |
892 | if (frame->next | |
c906108c SS |
893 | && (frame->next->signal_handler_caller |
894 | || pc_in_interrupt_handler (frame->next->pc))) | |
895 | { | |
896 | struct frame_saved_regs saved_regs; | |
897 | ||
898 | get_frame_saved_regs (frame->next, &saved_regs); | |
53a5351d JM |
899 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
900 | TARGET_PTR_BIT / 8) & 0x2) | |
c906108c | 901 | { |
53a5351d JM |
902 | pc = read_memory_integer (saved_regs.regs[31], |
903 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
904 | |
905 | /* Syscalls are really two frames. The syscall stub itself | |
c5aa993b JM |
906 | with a return pointer in %rp and the kernel call with |
907 | a return pointer in %r31. We return the %rp variant | |
908 | if %r31 is the same as frame->pc. */ | |
c906108c | 909 | if (pc == frame->pc) |
53a5351d JM |
910 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
911 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
912 | } |
913 | else | |
53a5351d JM |
914 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
915 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
916 | } |
917 | else | |
918 | pc = read_register (ret_regnum) & ~0x3; | |
919 | } | |
920 | else | |
921 | { | |
922 | spun_around_loop = 0; | |
c5aa993b | 923 | old_pc = pc; |
c906108c | 924 | |
c5aa993b | 925 | restart: |
c906108c SS |
926 | rp_offset = rp_saved (pc); |
927 | ||
928 | /* Similar to code in frameless function case. If the next | |
c5aa993b JM |
929 | frame is a signal or interrupt handler, then dig the right |
930 | information out of the saved register info. */ | |
c906108c SS |
931 | if (rp_offset == 0 |
932 | && frame->next | |
933 | && (frame->next->signal_handler_caller | |
934 | || pc_in_interrupt_handler (frame->next->pc))) | |
935 | { | |
936 | struct frame_saved_regs saved_regs; | |
937 | ||
938 | get_frame_saved_regs (frame->next, &saved_regs); | |
53a5351d JM |
939 | if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
940 | TARGET_PTR_BIT / 8) & 0x2) | |
c906108c | 941 | { |
53a5351d JM |
942 | pc = read_memory_integer (saved_regs.regs[31], |
943 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
944 | |
945 | /* Syscalls are really two frames. The syscall stub itself | |
c5aa993b JM |
946 | with a return pointer in %rp and the kernel call with |
947 | a return pointer in %r31. We return the %rp variant | |
948 | if %r31 is the same as frame->pc. */ | |
c906108c | 949 | if (pc == frame->pc) |
53a5351d JM |
950 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
951 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
952 | } |
953 | else | |
53a5351d JM |
954 | pc = read_memory_integer (saved_regs.regs[RP_REGNUM], |
955 | TARGET_PTR_BIT / 8) & ~0x3; | |
c906108c SS |
956 | } |
957 | else if (rp_offset == 0) | |
c5aa993b JM |
958 | { |
959 | old_pc = pc; | |
960 | pc = read_register (RP_REGNUM) & ~0x3; | |
961 | } | |
c906108c | 962 | else |
c5aa993b JM |
963 | { |
964 | old_pc = pc; | |
53a5351d JM |
965 | pc = read_memory_integer (frame->frame + rp_offset, |
966 | TARGET_PTR_BIT / 8) & ~0x3; | |
c5aa993b | 967 | } |
c906108c SS |
968 | } |
969 | ||
970 | /* If PC is inside a linker stub, then dig out the address the stub | |
971 | will return to. | |
972 | ||
973 | Don't do this for long branch stubs. Why? For some unknown reason | |
974 | _start is marked as a long branch stub in hpux10. */ | |
975 | u = find_unwind_entry (pc); | |
976 | if (u && u->stub_unwind.stub_type != 0 | |
977 | && u->stub_unwind.stub_type != LONG_BRANCH) | |
978 | { | |
979 | unsigned int insn; | |
980 | ||
981 | /* If this is a dynamic executable, and we're in a signal handler, | |
c5aa993b JM |
982 | then the call chain will eventually point us into the stub for |
983 | _sigreturn. Unlike most cases, we'll be pointed to the branch | |
984 | to the real sigreturn rather than the code after the real branch!. | |
c906108c | 985 | |
c5aa993b JM |
986 | Else, try to dig the address the stub will return to in the normal |
987 | fashion. */ | |
c906108c SS |
988 | insn = read_memory_integer (pc, 4); |
989 | if ((insn & 0xfc00e000) == 0xe8000000) | |
990 | return (pc + extract_17 (insn) + 8) & ~0x3; | |
991 | else | |
992 | { | |
c5aa993b JM |
993 | if (old_pc == pc) |
994 | spun_around_loop++; | |
995 | ||
996 | if (spun_around_loop > 1) | |
997 | { | |
998 | /* We're just about to go around the loop again with | |
999 | no more hope of success. Die. */ | |
1000 | error ("Unable to find return pc for this frame"); | |
1001 | } | |
1002 | else | |
1003 | goto restart; | |
c906108c SS |
1004 | } |
1005 | } | |
1006 | ||
1007 | return pc; | |
1008 | } | |
1009 | \f | |
1010 | /* We need to correct the PC and the FP for the outermost frame when we are | |
1011 | in a system call. */ | |
1012 | ||
1013 | void | |
fba45db2 | 1014 | init_extra_frame_info (int fromleaf, struct frame_info *frame) |
c906108c SS |
1015 | { |
1016 | int flags; | |
1017 | int framesize; | |
1018 | ||
1019 | if (frame->next && !fromleaf) | |
1020 | return; | |
1021 | ||
1022 | /* If the next frame represents a frameless function invocation | |
1023 | then we have to do some adjustments that are normally done by | |
1024 | FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */ | |
1025 | if (fromleaf) | |
1026 | { | |
1027 | /* Find the framesize of *this* frame without peeking at the PC | |
c5aa993b | 1028 | in the current frame structure (it isn't set yet). */ |
c906108c SS |
1029 | framesize = find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame))); |
1030 | ||
1031 | /* Now adjust our base frame accordingly. If we have a frame pointer | |
c5aa993b JM |
1032 | use it, else subtract the size of this frame from the current |
1033 | frame. (we always want frame->frame to point at the lowest address | |
1034 | in the frame). */ | |
c906108c SS |
1035 | if (framesize == -1) |
1036 | frame->frame = TARGET_READ_FP (); | |
1037 | else | |
1038 | frame->frame -= framesize; | |
1039 | return; | |
1040 | } | |
1041 | ||
1042 | flags = read_register (FLAGS_REGNUM); | |
c5aa993b | 1043 | if (flags & 2) /* In system call? */ |
c906108c SS |
1044 | frame->pc = read_register (31) & ~0x3; |
1045 | ||
1046 | /* The outermost frame is always derived from PC-framesize | |
1047 | ||
1048 | One might think frameless innermost frames should have | |
1049 | a frame->frame that is the same as the parent's frame->frame. | |
1050 | That is wrong; frame->frame in that case should be the *high* | |
1051 | address of the parent's frame. It's complicated as hell to | |
1052 | explain, but the parent *always* creates some stack space for | |
1053 | the child. So the child actually does have a frame of some | |
1054 | sorts, and its base is the high address in its parent's frame. */ | |
c5aa993b | 1055 | framesize = find_proc_framesize (frame->pc); |
c906108c SS |
1056 | if (framesize == -1) |
1057 | frame->frame = TARGET_READ_FP (); | |
1058 | else | |
1059 | frame->frame = read_register (SP_REGNUM) - framesize; | |
1060 | } | |
1061 | \f | |
1062 | /* Given a GDB frame, determine the address of the calling function's frame. | |
1063 | This will be used to create a new GDB frame struct, and then | |
1064 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
1065 | ||
1066 | This may involve searching through prologues for several functions | |
1067 | at boundaries where GCC calls HP C code, or where code which has | |
1068 | a frame pointer calls code without a frame pointer. */ | |
1069 | ||
1070 | CORE_ADDR | |
fba45db2 | 1071 | frame_chain (struct frame_info *frame) |
c906108c SS |
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 | ||
c2c6d25f JM |
1078 | /* A frame in the current frame list, or zero. */ |
1079 | struct frame_info *saved_regs_frame = 0; | |
1080 | /* Where the registers were saved in saved_regs_frame. | |
1081 | If saved_regs_frame is zero, this is garbage. */ | |
1082 | struct frame_saved_regs saved_regs; | |
1083 | ||
c5aa993b | 1084 | CORE_ADDR caller_pc; |
c906108c SS |
1085 | |
1086 | struct minimal_symbol *min_frame_symbol; | |
c5aa993b JM |
1087 | struct symbol *frame_symbol; |
1088 | char *frame_symbol_name; | |
c906108c SS |
1089 | |
1090 | /* If this is a threaded application, and we see the | |
1091 | routine "__pthread_exit", treat it as the stack root | |
1092 | for this thread. */ | |
c5aa993b JM |
1093 | min_frame_symbol = lookup_minimal_symbol_by_pc (frame->pc); |
1094 | frame_symbol = find_pc_function (frame->pc); | |
c906108c | 1095 | |
c5aa993b | 1096 | if ((min_frame_symbol != 0) /* && (frame_symbol == 0) */ ) |
c906108c | 1097 | { |
c5aa993b JM |
1098 | /* The test above for "no user function name" would defend |
1099 | against the slim likelihood that a user might define a | |
1100 | routine named "__pthread_exit" and then try to debug it. | |
1101 | ||
1102 | If it weren't commented out, and you tried to debug the | |
1103 | pthread library itself, you'd get errors. | |
1104 | ||
1105 | So for today, we don't make that check. */ | |
1106 | frame_symbol_name = SYMBOL_NAME (min_frame_symbol); | |
1107 | if (frame_symbol_name != 0) | |
1108 | { | |
1109 | if (0 == strncmp (frame_symbol_name, | |
1110 | THREAD_INITIAL_FRAME_SYMBOL, | |
1111 | THREAD_INITIAL_FRAME_SYM_LEN)) | |
1112 | { | |
1113 | /* Pretend we've reached the bottom of the stack. */ | |
1114 | return (CORE_ADDR) 0; | |
1115 | } | |
1116 | } | |
1117 | } /* End of hacky code for threads. */ | |
1118 | ||
c906108c SS |
1119 | /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These |
1120 | are easy; at *sp we have a full save state strucutre which we can | |
1121 | pull the old stack pointer from. Also see frame_saved_pc for | |
1122 | code to dig a saved PC out of the save state structure. */ | |
1123 | if (pc_in_interrupt_handler (frame->pc)) | |
53a5351d JM |
1124 | frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4, |
1125 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1126 | #ifdef FRAME_BASE_BEFORE_SIGTRAMP |
1127 | else if (frame->signal_handler_caller) | |
1128 | { | |
1129 | FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base); | |
1130 | } | |
1131 | #endif | |
1132 | else | |
1133 | frame_base = frame->frame; | |
1134 | ||
1135 | /* Get frame sizes for the current frame and the frame of the | |
1136 | caller. */ | |
1137 | my_framesize = find_proc_framesize (frame->pc); | |
c5aa993b | 1138 | caller_pc = FRAME_SAVED_PC (frame); |
c906108c SS |
1139 | |
1140 | /* If we can't determine the caller's PC, then it's not likely we can | |
1141 | really determine anything meaningful about its frame. We'll consider | |
1142 | this to be stack bottom. */ | |
1143 | if (caller_pc == (CORE_ADDR) 0) | |
1144 | return (CORE_ADDR) 0; | |
1145 | ||
c5aa993b | 1146 | caller_framesize = find_proc_framesize (FRAME_SAVED_PC (frame)); |
c906108c SS |
1147 | |
1148 | /* If caller does not have a frame pointer, then its frame | |
1149 | can be found at current_frame - caller_framesize. */ | |
1150 | if (caller_framesize != -1) | |
1151 | { | |
1152 | return frame_base - caller_framesize; | |
1153 | } | |
1154 | /* Both caller and callee have frame pointers and are GCC compiled | |
1155 | (SAVE_SP bit in unwind descriptor is on for both functions. | |
1156 | The previous frame pointer is found at the top of the current frame. */ | |
1157 | if (caller_framesize == -1 && my_framesize == -1) | |
1158 | { | |
53a5351d | 1159 | return read_memory_integer (frame_base, TARGET_PTR_BIT / 8); |
c906108c SS |
1160 | } |
1161 | /* Caller has a frame pointer, but callee does not. This is a little | |
1162 | more difficult as GCC and HP C lay out locals and callee register save | |
1163 | areas very differently. | |
1164 | ||
1165 | The previous frame pointer could be in a register, or in one of | |
1166 | several areas on the stack. | |
1167 | ||
1168 | Walk from the current frame to the innermost frame examining | |
1169 | unwind descriptors to determine if %r3 ever gets saved into the | |
1170 | stack. If so return whatever value got saved into the stack. | |
1171 | If it was never saved in the stack, then the value in %r3 is still | |
1172 | valid, so use it. | |
1173 | ||
1174 | We use information from unwind descriptors to determine if %r3 | |
1175 | is saved into the stack (Entry_GR field has this information). */ | |
1176 | ||
c2c6d25f | 1177 | for (tmp_frame = frame; tmp_frame; tmp_frame = tmp_frame->next) |
c906108c SS |
1178 | { |
1179 | u = find_unwind_entry (tmp_frame->pc); | |
1180 | ||
1181 | if (!u) | |
1182 | { | |
1183 | /* We could find this information by examining prologues. I don't | |
1184 | think anyone has actually written any tools (not even "strip") | |
1185 | which leave them out of an executable, so maybe this is a moot | |
1186 | point. */ | |
c5aa993b JM |
1187 | /* ??rehrauer: Actually, it's quite possible to stepi your way into |
1188 | code that doesn't have unwind entries. For example, stepping into | |
1189 | the dynamic linker will give you a PC that has none. Thus, I've | |
1190 | disabled this warning. */ | |
c906108c SS |
1191 | #if 0 |
1192 | warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc); | |
1193 | #endif | |
1194 | return (CORE_ADDR) 0; | |
1195 | } | |
1196 | ||
c2c6d25f | 1197 | if (u->Save_SP |
c906108c SS |
1198 | || tmp_frame->signal_handler_caller |
1199 | || pc_in_interrupt_handler (tmp_frame->pc)) | |
1200 | break; | |
c2c6d25f JM |
1201 | |
1202 | /* Entry_GR specifies the number of callee-saved general registers | |
1203 | saved in the stack. It starts at %r3, so %r3 would be 1. */ | |
1204 | if (u->Entry_GR >= 1) | |
1205 | { | |
1206 | /* The unwind entry claims that r3 is saved here. However, | |
1207 | in optimized code, GCC often doesn't actually save r3. | |
1208 | We'll discover this if we look at the prologue. */ | |
1209 | get_frame_saved_regs (tmp_frame, &saved_regs); | |
1210 | saved_regs_frame = tmp_frame; | |
1211 | ||
1212 | /* If we have an address for r3, that's good. */ | |
1213 | if (saved_regs.regs[FP_REGNUM]) | |
1214 | break; | |
1215 | } | |
c906108c SS |
1216 | } |
1217 | ||
1218 | if (tmp_frame) | |
1219 | { | |
1220 | /* We may have walked down the chain into a function with a frame | |
c5aa993b | 1221 | pointer. */ |
c906108c SS |
1222 | if (u->Save_SP |
1223 | && !tmp_frame->signal_handler_caller | |
1224 | && !pc_in_interrupt_handler (tmp_frame->pc)) | |
1225 | { | |
53a5351d | 1226 | return read_memory_integer (tmp_frame->frame, TARGET_PTR_BIT / 8); |
c906108c SS |
1227 | } |
1228 | /* %r3 was saved somewhere in the stack. Dig it out. */ | |
c5aa993b | 1229 | else |
c906108c | 1230 | { |
c906108c SS |
1231 | /* Sick. |
1232 | ||
1233 | For optimization purposes many kernels don't have the | |
1234 | callee saved registers into the save_state structure upon | |
1235 | entry into the kernel for a syscall; the optimization | |
1236 | is usually turned off if the process is being traced so | |
1237 | that the debugger can get full register state for the | |
1238 | process. | |
c5aa993b | 1239 | |
c906108c SS |
1240 | This scheme works well except for two cases: |
1241 | ||
c5aa993b JM |
1242 | * Attaching to a process when the process is in the |
1243 | kernel performing a system call (debugger can't get | |
1244 | full register state for the inferior process since | |
1245 | the process wasn't being traced when it entered the | |
1246 | system call). | |
c906108c | 1247 | |
c5aa993b JM |
1248 | * Register state is not complete if the system call |
1249 | causes the process to core dump. | |
c906108c SS |
1250 | |
1251 | ||
1252 | The following heinous code is an attempt to deal with | |
1253 | the lack of register state in a core dump. It will | |
1254 | fail miserably if the function which performs the | |
1255 | system call has a variable sized stack frame. */ | |
1256 | ||
c2c6d25f JM |
1257 | if (tmp_frame != saved_regs_frame) |
1258 | get_frame_saved_regs (tmp_frame, &saved_regs); | |
c906108c SS |
1259 | |
1260 | /* Abominable hack. */ | |
1261 | if (current_target.to_has_execution == 0 | |
1262 | && ((saved_regs.regs[FLAGS_REGNUM] | |
53a5351d JM |
1263 | && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
1264 | TARGET_PTR_BIT / 8) | |
c906108c SS |
1265 | & 0x2)) |
1266 | || (saved_regs.regs[FLAGS_REGNUM] == 0 | |
1267 | && read_register (FLAGS_REGNUM) & 0x2))) | |
1268 | { | |
1269 | u = find_unwind_entry (FRAME_SAVED_PC (frame)); | |
1270 | if (!u) | |
1271 | { | |
53a5351d JM |
1272 | return read_memory_integer (saved_regs.regs[FP_REGNUM], |
1273 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1274 | } |
1275 | else | |
1276 | { | |
1277 | return frame_base - (u->Total_frame_size << 3); | |
1278 | } | |
1279 | } | |
c5aa993b | 1280 | |
53a5351d JM |
1281 | return read_memory_integer (saved_regs.regs[FP_REGNUM], |
1282 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1283 | } |
1284 | } | |
1285 | else | |
1286 | { | |
c906108c SS |
1287 | /* Get the innermost frame. */ |
1288 | tmp_frame = frame; | |
1289 | while (tmp_frame->next != NULL) | |
1290 | tmp_frame = tmp_frame->next; | |
1291 | ||
c2c6d25f JM |
1292 | if (tmp_frame != saved_regs_frame) |
1293 | get_frame_saved_regs (tmp_frame, &saved_regs); | |
1294 | ||
c906108c SS |
1295 | /* Abominable hack. See above. */ |
1296 | if (current_target.to_has_execution == 0 | |
1297 | && ((saved_regs.regs[FLAGS_REGNUM] | |
53a5351d JM |
1298 | && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], |
1299 | TARGET_PTR_BIT / 8) | |
c906108c SS |
1300 | & 0x2)) |
1301 | || (saved_regs.regs[FLAGS_REGNUM] == 0 | |
c5aa993b | 1302 | && read_register (FLAGS_REGNUM) & 0x2))) |
c906108c SS |
1303 | { |
1304 | u = find_unwind_entry (FRAME_SAVED_PC (frame)); | |
1305 | if (!u) | |
1306 | { | |
53a5351d JM |
1307 | return read_memory_integer (saved_regs.regs[FP_REGNUM], |
1308 | TARGET_PTR_BIT / 8); | |
c906108c | 1309 | } |
c5aa993b JM |
1310 | else |
1311 | { | |
1312 | return frame_base - (u->Total_frame_size << 3); | |
1313 | } | |
c906108c | 1314 | } |
c5aa993b | 1315 | |
c906108c | 1316 | /* The value in %r3 was never saved into the stack (thus %r3 still |
c5aa993b | 1317 | holds the value of the previous frame pointer). */ |
c906108c SS |
1318 | return TARGET_READ_FP (); |
1319 | } | |
1320 | } | |
c906108c | 1321 | \f |
c5aa993b | 1322 | |
c906108c SS |
1323 | /* To see if a frame chain is valid, see if the caller looks like it |
1324 | was compiled with gcc. */ | |
1325 | ||
1326 | int | |
fba45db2 | 1327 | hppa_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe) |
c906108c SS |
1328 | { |
1329 | struct minimal_symbol *msym_us; | |
1330 | struct minimal_symbol *msym_start; | |
1331 | struct unwind_table_entry *u, *next_u = NULL; | |
1332 | struct frame_info *next; | |
1333 | ||
1334 | if (!chain) | |
1335 | return 0; | |
1336 | ||
1337 | u = find_unwind_entry (thisframe->pc); | |
1338 | ||
1339 | if (u == NULL) | |
1340 | return 1; | |
1341 | ||
1342 | /* We can't just check that the same of msym_us is "_start", because | |
1343 | someone idiotically decided that they were going to make a Ltext_end | |
1344 | symbol with the same address. This Ltext_end symbol is totally | |
1345 | indistinguishable (as nearly as I can tell) from the symbol for a function | |
1346 | which is (legitimately, since it is in the user's namespace) | |
1347 | named Ltext_end, so we can't just ignore it. */ | |
1348 | msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); | |
1349 | msym_start = lookup_minimal_symbol ("_start", NULL, NULL); | |
1350 | if (msym_us | |
1351 | && msym_start | |
1352 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) | |
1353 | return 0; | |
1354 | ||
1355 | /* Grrrr. Some new idiot decided that they don't want _start for the | |
1356 | PRO configurations; $START$ calls main directly.... Deal with it. */ | |
1357 | msym_start = lookup_minimal_symbol ("$START$", NULL, NULL); | |
1358 | if (msym_us | |
1359 | && msym_start | |
1360 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) | |
1361 | return 0; | |
1362 | ||
1363 | next = get_next_frame (thisframe); | |
1364 | if (next) | |
1365 | next_u = find_unwind_entry (next->pc); | |
1366 | ||
1367 | /* If this frame does not save SP, has no stack, isn't a stub, | |
1368 | and doesn't "call" an interrupt routine or signal handler caller, | |
1369 | then its not valid. */ | |
1370 | if (u->Save_SP || u->Total_frame_size || u->stub_unwind.stub_type != 0 | |
1371 | || (thisframe->next && thisframe->next->signal_handler_caller) | |
1372 | || (next_u && next_u->HP_UX_interrupt_marker)) | |
1373 | return 1; | |
1374 | ||
1375 | if (pc_in_linker_stub (thisframe->pc)) | |
1376 | return 1; | |
1377 | ||
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | These functions deal with saving and restoring register state | |
1383 | around a function call in the inferior. They keep the stack | |
1384 | double-word aligned; eventually, on an hp700, the stack will have | |
1385 | to be aligned to a 64-byte boundary. */ | |
1386 | ||
1387 | void | |
fba45db2 | 1388 | push_dummy_frame (struct inferior_status *inf_status) |
c906108c SS |
1389 | { |
1390 | CORE_ADDR sp, pc, pcspace; | |
1391 | register int regnum; | |
53a5351d | 1392 | CORE_ADDR int_buffer; |
c906108c SS |
1393 | double freg_buffer; |
1394 | ||
1395 | /* Oh, what a hack. If we're trying to perform an inferior call | |
1396 | while the inferior is asleep, we have to make sure to clear | |
1397 | the "in system call" bit in the flag register (the call will | |
1398 | start after the syscall returns, so we're no longer in the system | |
1399 | call!) This state is kept in "inf_status", change it there. | |
1400 | ||
1401 | We also need a number of horrid hacks to deal with lossage in the | |
1402 | PC queue registers (apparently they're not valid when the in syscall | |
1403 | bit is set). */ | |
39f77062 | 1404 | pc = target_read_pc (inferior_ptid); |
c906108c SS |
1405 | int_buffer = read_register (FLAGS_REGNUM); |
1406 | if (int_buffer & 0x2) | |
1407 | { | |
1408 | unsigned int sid; | |
1409 | int_buffer &= ~0x2; | |
7a292a7a SS |
1410 | write_inferior_status_register (inf_status, 0, int_buffer); |
1411 | write_inferior_status_register (inf_status, PCOQ_HEAD_REGNUM, pc + 0); | |
1412 | write_inferior_status_register (inf_status, PCOQ_TAIL_REGNUM, pc + 4); | |
c906108c SS |
1413 | sid = (pc >> 30) & 0x3; |
1414 | if (sid == 0) | |
1415 | pcspace = read_register (SR4_REGNUM); | |
1416 | else | |
1417 | pcspace = read_register (SR4_REGNUM + 4 + sid); | |
7a292a7a SS |
1418 | write_inferior_status_register (inf_status, PCSQ_HEAD_REGNUM, pcspace); |
1419 | write_inferior_status_register (inf_status, PCSQ_TAIL_REGNUM, pcspace); | |
c906108c SS |
1420 | } |
1421 | else | |
1422 | pcspace = read_register (PCSQ_HEAD_REGNUM); | |
1423 | ||
1424 | /* Space for "arguments"; the RP goes in here. */ | |
1425 | sp = read_register (SP_REGNUM) + 48; | |
1426 | int_buffer = read_register (RP_REGNUM) | 0x3; | |
53a5351d JM |
1427 | |
1428 | /* The 32bit and 64bit ABIs save the return pointer into different | |
1429 | stack slots. */ | |
1430 | if (REGISTER_SIZE == 8) | |
1431 | write_memory (sp - 16, (char *) &int_buffer, REGISTER_SIZE); | |
1432 | else | |
1433 | write_memory (sp - 20, (char *) &int_buffer, REGISTER_SIZE); | |
c906108c SS |
1434 | |
1435 | int_buffer = TARGET_READ_FP (); | |
53a5351d | 1436 | write_memory (sp, (char *) &int_buffer, REGISTER_SIZE); |
c906108c SS |
1437 | |
1438 | write_register (FP_REGNUM, sp); | |
1439 | ||
53a5351d | 1440 | sp += 2 * REGISTER_SIZE; |
c906108c SS |
1441 | |
1442 | for (regnum = 1; regnum < 32; regnum++) | |
1443 | if (regnum != RP_REGNUM && regnum != FP_REGNUM) | |
1444 | sp = push_word (sp, read_register (regnum)); | |
1445 | ||
53a5351d JM |
1446 | /* This is not necessary for the 64bit ABI. In fact it is dangerous. */ |
1447 | if (REGISTER_SIZE != 8) | |
1448 | sp += 4; | |
c906108c SS |
1449 | |
1450 | for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) | |
1451 | { | |
c5aa993b JM |
1452 | read_register_bytes (REGISTER_BYTE (regnum), (char *) &freg_buffer, 8); |
1453 | sp = push_bytes (sp, (char *) &freg_buffer, 8); | |
c906108c SS |
1454 | } |
1455 | sp = push_word (sp, read_register (IPSW_REGNUM)); | |
1456 | sp = push_word (sp, read_register (SAR_REGNUM)); | |
1457 | sp = push_word (sp, pc); | |
1458 | sp = push_word (sp, pcspace); | |
1459 | sp = push_word (sp, pc + 4); | |
1460 | sp = push_word (sp, pcspace); | |
1461 | write_register (SP_REGNUM, sp); | |
1462 | } | |
1463 | ||
1464 | static void | |
fba45db2 KB |
1465 | find_dummy_frame_regs (struct frame_info *frame, |
1466 | struct frame_saved_regs *frame_saved_regs) | |
c906108c SS |
1467 | { |
1468 | CORE_ADDR fp = frame->frame; | |
1469 | int i; | |
1470 | ||
53a5351d JM |
1471 | /* The 32bit and 64bit ABIs save RP into different locations. */ |
1472 | if (REGISTER_SIZE == 8) | |
1473 | frame_saved_regs->regs[RP_REGNUM] = (fp - 16) & ~0x3; | |
1474 | else | |
1475 | frame_saved_regs->regs[RP_REGNUM] = (fp - 20) & ~0x3; | |
1476 | ||
c906108c | 1477 | frame_saved_regs->regs[FP_REGNUM] = fp; |
c906108c | 1478 | |
53a5351d JM |
1479 | frame_saved_regs->regs[1] = fp + (2 * REGISTER_SIZE); |
1480 | ||
1481 | for (fp += 3 * REGISTER_SIZE, i = 3; i < 32; i++) | |
c906108c SS |
1482 | { |
1483 | if (i != FP_REGNUM) | |
1484 | { | |
1485 | frame_saved_regs->regs[i] = fp; | |
53a5351d | 1486 | fp += REGISTER_SIZE; |
c906108c SS |
1487 | } |
1488 | } | |
1489 | ||
53a5351d JM |
1490 | /* This is not necessary or desirable for the 64bit ABI. */ |
1491 | if (REGISTER_SIZE != 8) | |
1492 | fp += 4; | |
1493 | ||
c906108c SS |
1494 | for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8) |
1495 | frame_saved_regs->regs[i] = fp; | |
1496 | ||
1497 | frame_saved_regs->regs[IPSW_REGNUM] = fp; | |
53a5351d JM |
1498 | frame_saved_regs->regs[SAR_REGNUM] = fp + REGISTER_SIZE; |
1499 | frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 2 * REGISTER_SIZE; | |
1500 | frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 3 * REGISTER_SIZE; | |
1501 | frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 4 * REGISTER_SIZE; | |
1502 | frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 5 * REGISTER_SIZE; | |
c906108c SS |
1503 | } |
1504 | ||
1505 | void | |
fba45db2 | 1506 | hppa_pop_frame (void) |
c906108c SS |
1507 | { |
1508 | register struct frame_info *frame = get_current_frame (); | |
1509 | register CORE_ADDR fp, npc, target_pc; | |
1510 | register int regnum; | |
1511 | struct frame_saved_regs fsr; | |
1512 | double freg_buffer; | |
1513 | ||
1514 | fp = FRAME_FP (frame); | |
1515 | get_frame_saved_regs (frame, &fsr); | |
1516 | ||
1517 | #ifndef NO_PC_SPACE_QUEUE_RESTORE | |
c5aa993b | 1518 | if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */ |
c906108c SS |
1519 | restore_pc_queue (&fsr); |
1520 | #endif | |
1521 | ||
1522 | for (regnum = 31; regnum > 0; regnum--) | |
1523 | if (fsr.regs[regnum]) | |
53a5351d JM |
1524 | write_register (regnum, read_memory_integer (fsr.regs[regnum], |
1525 | REGISTER_SIZE)); | |
c906108c | 1526 | |
c5aa993b | 1527 | for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM; regnum--) |
c906108c SS |
1528 | if (fsr.regs[regnum]) |
1529 | { | |
c5aa993b JM |
1530 | read_memory (fsr.regs[regnum], (char *) &freg_buffer, 8); |
1531 | write_register_bytes (REGISTER_BYTE (regnum), (char *) &freg_buffer, 8); | |
c906108c SS |
1532 | } |
1533 | ||
1534 | if (fsr.regs[IPSW_REGNUM]) | |
1535 | write_register (IPSW_REGNUM, | |
53a5351d JM |
1536 | read_memory_integer (fsr.regs[IPSW_REGNUM], |
1537 | REGISTER_SIZE)); | |
c906108c SS |
1538 | |
1539 | if (fsr.regs[SAR_REGNUM]) | |
1540 | write_register (SAR_REGNUM, | |
53a5351d JM |
1541 | read_memory_integer (fsr.regs[SAR_REGNUM], |
1542 | REGISTER_SIZE)); | |
c906108c SS |
1543 | |
1544 | /* If the PC was explicitly saved, then just restore it. */ | |
1545 | if (fsr.regs[PCOQ_TAIL_REGNUM]) | |
1546 | { | |
53a5351d JM |
1547 | npc = read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], |
1548 | REGISTER_SIZE); | |
c906108c SS |
1549 | write_register (PCOQ_TAIL_REGNUM, npc); |
1550 | } | |
1551 | /* Else use the value in %rp to set the new PC. */ | |
c5aa993b | 1552 | else |
c906108c SS |
1553 | { |
1554 | npc = read_register (RP_REGNUM); | |
1555 | write_pc (npc); | |
1556 | } | |
1557 | ||
53a5351d | 1558 | write_register (FP_REGNUM, read_memory_integer (fp, REGISTER_SIZE)); |
c906108c | 1559 | |
c5aa993b | 1560 | if (fsr.regs[IPSW_REGNUM]) /* call dummy */ |
c906108c SS |
1561 | write_register (SP_REGNUM, fp - 48); |
1562 | else | |
1563 | write_register (SP_REGNUM, fp); | |
1564 | ||
1565 | /* The PC we just restored may be inside a return trampoline. If so | |
1566 | we want to restart the inferior and run it through the trampoline. | |
1567 | ||
1568 | Do this by setting a momentary breakpoint at the location the | |
1569 | trampoline returns to. | |
1570 | ||
1571 | Don't skip through the trampoline if we're popping a dummy frame. */ | |
1572 | target_pc = SKIP_TRAMPOLINE_CODE (npc & ~0x3) & ~0x3; | |
1573 | if (target_pc && !fsr.regs[IPSW_REGNUM]) | |
1574 | { | |
1575 | struct symtab_and_line sal; | |
1576 | struct breakpoint *breakpoint; | |
1577 | struct cleanup *old_chain; | |
1578 | ||
1579 | /* Set up our breakpoint. Set it to be silent as the MI code | |
c5aa993b | 1580 | for "return_command" will print the frame we returned to. */ |
c906108c SS |
1581 | sal = find_pc_line (target_pc, 0); |
1582 | sal.pc = target_pc; | |
1583 | breakpoint = set_momentary_breakpoint (sal, NULL, bp_finish); | |
1584 | breakpoint->silent = 1; | |
1585 | ||
1586 | /* So we can clean things up. */ | |
4d6140d9 | 1587 | old_chain = make_cleanup_delete_breakpoint (breakpoint); |
c906108c SS |
1588 | |
1589 | /* Start up the inferior. */ | |
1590 | clear_proceed_status (); | |
1591 | proceed_to_finish = 1; | |
2acceee2 | 1592 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0); |
c906108c SS |
1593 | |
1594 | /* Perform our cleanups. */ | |
1595 | do_cleanups (old_chain); | |
1596 | } | |
1597 | flush_cached_frames (); | |
1598 | } | |
1599 | ||
1600 | /* After returning to a dummy on the stack, restore the instruction | |
1601 | queue space registers. */ | |
1602 | ||
1603 | static int | |
fba45db2 | 1604 | restore_pc_queue (struct frame_saved_regs *fsr) |
c906108c SS |
1605 | { |
1606 | CORE_ADDR pc = read_pc (); | |
53a5351d JM |
1607 | CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], |
1608 | TARGET_PTR_BIT / 8); | |
c906108c SS |
1609 | struct target_waitstatus w; |
1610 | int insn_count; | |
1611 | ||
1612 | /* Advance past break instruction in the call dummy. */ | |
1613 | write_register (PCOQ_HEAD_REGNUM, pc + 4); | |
1614 | write_register (PCOQ_TAIL_REGNUM, pc + 8); | |
1615 | ||
1616 | /* HPUX doesn't let us set the space registers or the space | |
1617 | registers of the PC queue through ptrace. Boo, hiss. | |
1618 | Conveniently, the call dummy has this sequence of instructions | |
1619 | after the break: | |
c5aa993b JM |
1620 | mtsp r21, sr0 |
1621 | ble,n 0(sr0, r22) | |
1622 | ||
c906108c SS |
1623 | So, load up the registers and single step until we are in the |
1624 | right place. */ | |
1625 | ||
53a5351d JM |
1626 | write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], |
1627 | REGISTER_SIZE)); | |
c906108c SS |
1628 | write_register (22, new_pc); |
1629 | ||
1630 | for (insn_count = 0; insn_count < 3; insn_count++) | |
1631 | { | |
1632 | /* FIXME: What if the inferior gets a signal right now? Want to | |
c5aa993b JM |
1633 | merge this into wait_for_inferior (as a special kind of |
1634 | watchpoint? By setting a breakpoint at the end? Is there | |
1635 | any other choice? Is there *any* way to do this stuff with | |
1636 | ptrace() or some equivalent?). */ | |
c906108c | 1637 | resume (1, 0); |
39f77062 | 1638 | target_wait (inferior_ptid, &w); |
c906108c SS |
1639 | |
1640 | if (w.kind == TARGET_WAITKIND_SIGNALLED) | |
c5aa993b JM |
1641 | { |
1642 | stop_signal = w.value.sig; | |
1643 | terminal_ours_for_output (); | |
1644 | printf_unfiltered ("\nProgram terminated with signal %s, %s.\n", | |
c906108c SS |
1645 | target_signal_to_name (stop_signal), |
1646 | target_signal_to_string (stop_signal)); | |
c5aa993b JM |
1647 | gdb_flush (gdb_stdout); |
1648 | return 0; | |
1649 | } | |
c906108c SS |
1650 | } |
1651 | target_terminal_ours (); | |
1652 | target_fetch_registers (-1); | |
1653 | return 1; | |
1654 | } | |
1655 | ||
c2c6d25f JM |
1656 | |
1657 | #ifdef PA20W_CALLING_CONVENTIONS | |
1658 | ||
53a5351d JM |
1659 | /* This function pushes a stack frame with arguments as part of the |
1660 | inferior function calling mechanism. | |
c906108c | 1661 | |
c2c6d25f JM |
1662 | This is the version for the PA64, in which later arguments appear |
1663 | at higher addresses. (The stack always grows towards higher | |
1664 | addresses.) | |
c906108c | 1665 | |
53a5351d JM |
1666 | We simply allocate the appropriate amount of stack space and put |
1667 | arguments into their proper slots. The call dummy code will copy | |
1668 | arguments into registers as needed by the ABI. | |
c906108c | 1669 | |
c2c6d25f JM |
1670 | This ABI also requires that the caller provide an argument pointer |
1671 | to the callee, so we do that too. */ | |
53a5351d | 1672 | |
c906108c | 1673 | CORE_ADDR |
ea7c478f | 1674 | hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
fba45db2 | 1675 | int struct_return, CORE_ADDR struct_addr) |
c906108c SS |
1676 | { |
1677 | /* array of arguments' offsets */ | |
c5aa993b | 1678 | int *offset = (int *) alloca (nargs * sizeof (int)); |
53a5351d JM |
1679 | |
1680 | /* array of arguments' lengths: real lengths in bytes, not aligned to | |
1681 | word size */ | |
c5aa993b | 1682 | int *lengths = (int *) alloca (nargs * sizeof (int)); |
c906108c | 1683 | |
53a5351d JM |
1684 | /* The value of SP as it was passed into this function after |
1685 | aligning. */ | |
1686 | CORE_ADDR orig_sp = STACK_ALIGN (sp); | |
c906108c | 1687 | |
53a5351d JM |
1688 | /* The number of stack bytes occupied by the current argument. */ |
1689 | int bytes_reserved; | |
1690 | ||
1691 | /* The total number of bytes reserved for the arguments. */ | |
1692 | int cum_bytes_reserved = 0; | |
c906108c | 1693 | |
53a5351d JM |
1694 | /* Similarly, but aligned. */ |
1695 | int cum_bytes_aligned = 0; | |
1696 | int i; | |
c5aa993b | 1697 | |
53a5351d | 1698 | /* Iterate over each argument provided by the user. */ |
c906108c SS |
1699 | for (i = 0; i < nargs; i++) |
1700 | { | |
c2c6d25f JM |
1701 | struct type *arg_type = VALUE_TYPE (args[i]); |
1702 | ||
1703 | /* Integral scalar values smaller than a register are padded on | |
1704 | the left. We do this by promoting them to full-width, | |
1705 | although the ABI says to pad them with garbage. */ | |
1706 | if (is_integral_type (arg_type) | |
1707 | && TYPE_LENGTH (arg_type) < REGISTER_SIZE) | |
1708 | { | |
1709 | args[i] = value_cast ((TYPE_UNSIGNED (arg_type) | |
1710 | ? builtin_type_unsigned_long | |
1711 | : builtin_type_long), | |
1712 | args[i]); | |
1713 | arg_type = VALUE_TYPE (args[i]); | |
1714 | } | |
1715 | ||
1716 | lengths[i] = TYPE_LENGTH (arg_type); | |
c906108c | 1717 | |
53a5351d JM |
1718 | /* Align the size of the argument to the word size for this |
1719 | target. */ | |
1720 | bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE; | |
c906108c | 1721 | |
53a5351d JM |
1722 | offset[i] = cum_bytes_reserved; |
1723 | ||
c2c6d25f JM |
1724 | /* Aggregates larger than eight bytes (the only types larger |
1725 | than eight bytes we have) are aligned on a 16-byte boundary, | |
1726 | possibly padded on the right with garbage. This may leave an | |
1727 | empty word on the stack, and thus an unused register, as per | |
1728 | the ABI. */ | |
1729 | if (bytes_reserved > 8) | |
1730 | { | |
1731 | /* Round up the offset to a multiple of two slots. */ | |
1732 | int new_offset = ((offset[i] + 2*REGISTER_SIZE-1) | |
1733 | & -(2*REGISTER_SIZE)); | |
c906108c | 1734 | |
c2c6d25f JM |
1735 | /* Note the space we've wasted, if any. */ |
1736 | bytes_reserved += new_offset - offset[i]; | |
1737 | offset[i] = new_offset; | |
1738 | } | |
53a5351d | 1739 | |
c2c6d25f JM |
1740 | cum_bytes_reserved += bytes_reserved; |
1741 | } | |
1742 | ||
1743 | /* CUM_BYTES_RESERVED already accounts for all the arguments | |
1744 | passed by the user. However, the ABIs mandate minimum stack space | |
1745 | allocations for outgoing arguments. | |
1746 | ||
1747 | The ABIs also mandate minimum stack alignments which we must | |
1748 | preserve. */ | |
1749 | cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved); | |
1750 | sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE); | |
1751 | ||
1752 | /* Now write each of the args at the proper offset down the stack. */ | |
1753 | for (i = 0; i < nargs; i++) | |
1754 | write_memory (orig_sp + offset[i], VALUE_CONTENTS (args[i]), lengths[i]); | |
1755 | ||
1756 | /* If a structure has to be returned, set up register 28 to hold its | |
1757 | address */ | |
1758 | if (struct_return) | |
1759 | write_register (28, struct_addr); | |
1760 | ||
1761 | /* For the PA64 we must pass a pointer to the outgoing argument list. | |
1762 | The ABI mandates that the pointer should point to the first byte of | |
1763 | storage beyond the register flushback area. | |
1764 | ||
1765 | However, the call dummy expects the outgoing argument pointer to | |
1766 | be passed in register %r4. */ | |
1767 | write_register (4, orig_sp + REG_PARM_STACK_SPACE); | |
1768 | ||
1769 | /* ?!? This needs further work. We need to set up the global data | |
1770 | pointer for this procedure. This assumes the same global pointer | |
1771 | for every procedure. The call dummy expects the dp value to | |
1772 | be passed in register %r6. */ | |
1773 | write_register (6, read_register (27)); | |
1774 | ||
1775 | /* The stack will have 64 bytes of additional space for a frame marker. */ | |
1776 | return sp + 64; | |
1777 | } | |
1778 | ||
1779 | #else | |
1780 | ||
1781 | /* This function pushes a stack frame with arguments as part of the | |
1782 | inferior function calling mechanism. | |
1783 | ||
1784 | This is the version of the function for the 32-bit PA machines, in | |
1785 | which later arguments appear at lower addresses. (The stack always | |
1786 | grows towards higher addresses.) | |
1787 | ||
1788 | We simply allocate the appropriate amount of stack space and put | |
1789 | arguments into their proper slots. The call dummy code will copy | |
1790 | arguments into registers as needed by the ABI. */ | |
1791 | ||
1792 | CORE_ADDR | |
ea7c478f | 1793 | hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
fba45db2 | 1794 | int struct_return, CORE_ADDR struct_addr) |
c2c6d25f JM |
1795 | { |
1796 | /* array of arguments' offsets */ | |
1797 | int *offset = (int *) alloca (nargs * sizeof (int)); | |
1798 | ||
1799 | /* array of arguments' lengths: real lengths in bytes, not aligned to | |
1800 | word size */ | |
1801 | int *lengths = (int *) alloca (nargs * sizeof (int)); | |
1802 | ||
1803 | /* The number of stack bytes occupied by the current argument. */ | |
1804 | int bytes_reserved; | |
1805 | ||
1806 | /* The total number of bytes reserved for the arguments. */ | |
1807 | int cum_bytes_reserved = 0; | |
1808 | ||
1809 | /* Similarly, but aligned. */ | |
1810 | int cum_bytes_aligned = 0; | |
1811 | int i; | |
1812 | ||
1813 | /* Iterate over each argument provided by the user. */ | |
1814 | for (i = 0; i < nargs; i++) | |
1815 | { | |
1816 | lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i])); | |
1817 | ||
1818 | /* Align the size of the argument to the word size for this | |
1819 | target. */ | |
1820 | bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE; | |
1821 | ||
b6649e88 AC |
1822 | offset[i] = (cum_bytes_reserved |
1823 | + (lengths[i] > 4 ? bytes_reserved : lengths[i])); | |
c2c6d25f JM |
1824 | |
1825 | /* If the argument is a double word argument, then it needs to be | |
1826 | double word aligned. */ | |
53a5351d | 1827 | if ((bytes_reserved == 2 * REGISTER_SIZE) |
c2c6d25f | 1828 | && (offset[i] % 2 * REGISTER_SIZE)) |
c5aa993b JM |
1829 | { |
1830 | int new_offset = 0; | |
53a5351d JM |
1831 | /* BYTES_RESERVED is already aligned to the word, so we put |
1832 | the argument at one word more down the stack. | |
1833 | ||
1834 | This will leave one empty word on the stack, and one unused | |
1835 | register as mandated by the ABI. */ | |
1836 | new_offset = ((offset[i] + 2 * REGISTER_SIZE - 1) | |
1837 | & -(2 * REGISTER_SIZE)); | |
1838 | ||
1839 | if ((new_offset - offset[i]) >= 2 * REGISTER_SIZE) | |
c5aa993b | 1840 | { |
53a5351d JM |
1841 | bytes_reserved += REGISTER_SIZE; |
1842 | offset[i] += REGISTER_SIZE; | |
c5aa993b JM |
1843 | } |
1844 | } | |
c906108c SS |
1845 | |
1846 | cum_bytes_reserved += bytes_reserved; | |
1847 | ||
1848 | } | |
1849 | ||
c2c6d25f JM |
1850 | /* CUM_BYTES_RESERVED already accounts for all the arguments passed |
1851 | by the user. However, the ABI mandates minimum stack space | |
53a5351d JM |
1852 | allocations for outgoing arguments. |
1853 | ||
c2c6d25f | 1854 | The ABI also mandates minimum stack alignments which we must |
53a5351d | 1855 | preserve. */ |
c906108c | 1856 | cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved); |
53a5351d JM |
1857 | sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE); |
1858 | ||
1859 | /* Now write each of the args at the proper offset down the stack. | |
53a5351d JM |
1860 | ?!? We need to promote values to a full register instead of skipping |
1861 | words in the stack. */ | |
c906108c SS |
1862 | for (i = 0; i < nargs; i++) |
1863 | write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]); | |
c906108c | 1864 | |
53a5351d JM |
1865 | /* If a structure has to be returned, set up register 28 to hold its |
1866 | address */ | |
c906108c SS |
1867 | if (struct_return) |
1868 | write_register (28, struct_addr); | |
1869 | ||
53a5351d | 1870 | /* The stack will have 32 bytes of additional space for a frame marker. */ |
c906108c SS |
1871 | return sp + 32; |
1872 | } | |
1873 | ||
c2c6d25f | 1874 | #endif |
c906108c SS |
1875 | |
1876 | /* elz: this function returns a value which is built looking at the given address. | |
1877 | It is called from call_function_by_hand, in case we need to return a | |
1878 | value which is larger than 64 bits, and it is stored in the stack rather than | |
1879 | in the registers r28 and r29 or fr4. | |
1880 | This function does the same stuff as value_being_returned in values.c, but | |
1881 | gets the value from the stack rather than from the buffer where all the | |
1882 | registers were saved when the function called completed. */ | |
ea7c478f | 1883 | struct value * |
fba45db2 | 1884 | hppa_value_returned_from_stack (register struct type *valtype, CORE_ADDR addr) |
c906108c | 1885 | { |
ea7c478f | 1886 | register struct value *val; |
c906108c SS |
1887 | |
1888 | val = allocate_value (valtype); | |
1889 | CHECK_TYPEDEF (valtype); | |
c5aa993b | 1890 | target_read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (valtype)); |
c906108c SS |
1891 | |
1892 | return val; | |
1893 | } | |
1894 | ||
1895 | ||
1896 | ||
1897 | /* elz: Used to lookup a symbol in the shared libraries. | |
c5aa993b JM |
1898 | This function calls shl_findsym, indirectly through a |
1899 | call to __d_shl_get. __d_shl_get is in end.c, which is always | |
1900 | linked in by the hp compilers/linkers. | |
1901 | The call to shl_findsym cannot be made directly because it needs | |
1902 | to be active in target address space. | |
1903 | inputs: - minimal symbol pointer for the function we want to look up | |
1904 | - address in target space of the descriptor for the library | |
1905 | where we want to look the symbol up. | |
1906 | This address is retrieved using the | |
1907 | som_solib_get_solib_by_pc function (somsolib.c). | |
1908 | output: - real address in the library of the function. | |
1909 | note: the handle can be null, in which case shl_findsym will look for | |
1910 | the symbol in all the loaded shared libraries. | |
1911 | files to look at if you need reference on this stuff: | |
1912 | dld.c, dld_shl_findsym.c | |
1913 | end.c | |
1914 | man entry for shl_findsym */ | |
c906108c SS |
1915 | |
1916 | CORE_ADDR | |
fba45db2 | 1917 | find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle) |
c906108c | 1918 | { |
c5aa993b JM |
1919 | struct symbol *get_sym, *symbol2; |
1920 | struct minimal_symbol *buff_minsym, *msymbol; | |
1921 | struct type *ftype; | |
ea7c478f AC |
1922 | struct value **args; |
1923 | struct value *funcval; | |
1924 | struct value *val; | |
c5aa993b JM |
1925 | |
1926 | int x, namelen, err_value, tmp = -1; | |
1927 | CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; | |
1928 | CORE_ADDR stub_addr; | |
1929 | ||
1930 | ||
ea7c478f | 1931 | args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */ |
c5aa993b JM |
1932 | funcval = find_function_in_inferior ("__d_shl_get"); |
1933 | get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_NAMESPACE, NULL, NULL); | |
1934 | buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL); | |
1935 | msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); | |
1936 | symbol2 = lookup_symbol ("__shldp", NULL, VAR_NAMESPACE, NULL, NULL); | |
1937 | endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); | |
1938 | namelen = strlen (SYMBOL_NAME (function)); | |
1939 | value_return_addr = endo_buff_addr + namelen; | |
1940 | ftype = check_typedef (SYMBOL_TYPE (get_sym)); | |
1941 | ||
1942 | /* do alignment */ | |
1943 | if ((x = value_return_addr % 64) != 0) | |
1944 | value_return_addr = value_return_addr + 64 - x; | |
1945 | ||
1946 | errno_return_addr = value_return_addr + 64; | |
1947 | ||
1948 | ||
1949 | /* set up stuff needed by __d_shl_get in buffer in end.o */ | |
1950 | ||
1951 | target_write_memory (endo_buff_addr, SYMBOL_NAME (function), namelen); | |
1952 | ||
1953 | target_write_memory (value_return_addr, (char *) &tmp, 4); | |
1954 | ||
1955 | target_write_memory (errno_return_addr, (char *) &tmp, 4); | |
1956 | ||
1957 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
1958 | (char *) &handle, 4); | |
1959 | ||
1960 | /* now prepare the arguments for the call */ | |
1961 | ||
1962 | args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12); | |
4478b372 JB |
1963 | args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol)); |
1964 | args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr); | |
c5aa993b | 1965 | args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE); |
4478b372 JB |
1966 | args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr); |
1967 | args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr); | |
c5aa993b JM |
1968 | |
1969 | /* now call the function */ | |
1970 | ||
1971 | val = call_function_by_hand (funcval, 6, args); | |
1972 | ||
1973 | /* now get the results */ | |
1974 | ||
1975 | target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value)); | |
1976 | ||
1977 | target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr)); | |
1978 | if (stub_addr <= 0) | |
104c1213 | 1979 | error ("call to __d_shl_get failed, error code is %d", err_value); |
c5aa993b JM |
1980 | |
1981 | return (stub_addr); | |
c906108c SS |
1982 | } |
1983 | ||
c5aa993b | 1984 | /* Cover routine for find_stub_with_shl_get to pass to catch_errors */ |
a0b3c4fd JM |
1985 | static int |
1986 | cover_find_stub_with_shl_get (PTR args_untyped) | |
c906108c | 1987 | { |
a0b3c4fd JM |
1988 | args_for_find_stub *args = args_untyped; |
1989 | args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle); | |
1990 | return 0; | |
c906108c SS |
1991 | } |
1992 | ||
c906108c SS |
1993 | /* Insert the specified number of args and function address |
1994 | into a call sequence of the above form stored at DUMMYNAME. | |
1995 | ||
1996 | On the hppa we need to call the stack dummy through $$dyncall. | |
1997 | Therefore our version of FIX_CALL_DUMMY takes an extra argument, | |
1998 | real_pc, which is the location where gdb should start up the | |
cce74817 JM |
1999 | inferior to do the function call. |
2000 | ||
2001 | This has to work across several versions of hpux, bsd, osf1. It has to | |
2002 | work regardless of what compiler was used to build the inferior program. | |
2003 | It should work regardless of whether or not end.o is available. It has | |
2004 | to work even if gdb can not call into the dynamic loader in the inferior | |
2005 | to query it for symbol names and addresses. | |
2006 | ||
2007 | Yes, all those cases should work. Luckily code exists to handle most | |
2008 | of them. The complexity is in selecting exactly what scheme should | |
2009 | be used to perform the inferior call. | |
2010 | ||
2011 | At the current time this routine is known not to handle cases where | |
2012 | the program was linked with HP's compiler without including end.o. | |
2013 | ||
2014 | Please contact Jeff Law (law@cygnus.com) before changing this code. */ | |
c906108c SS |
2015 | |
2016 | CORE_ADDR | |
fba45db2 | 2017 | hppa_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, |
ea7c478f | 2018 | struct value **args, struct type *type, int gcc_p) |
c906108c SS |
2019 | { |
2020 | CORE_ADDR dyncall_addr; | |
2021 | struct minimal_symbol *msymbol; | |
2022 | struct minimal_symbol *trampoline; | |
2023 | int flags = read_register (FLAGS_REGNUM); | |
cce74817 JM |
2024 | struct unwind_table_entry *u = NULL; |
2025 | CORE_ADDR new_stub = 0; | |
2026 | CORE_ADDR solib_handle = 0; | |
2027 | ||
2028 | /* Nonzero if we will use GCC's PLT call routine. This routine must be | |
c2c6d25f JM |
2029 | passed an import stub, not a PLABEL. It is also necessary to set %r19 |
2030 | (the PIC register) before performing the call. | |
c906108c | 2031 | |
cce74817 JM |
2032 | If zero, then we are using __d_plt_call (HP's PLT call routine) or we |
2033 | are calling the target directly. When using __d_plt_call we want to | |
2034 | use a PLABEL instead of an import stub. */ | |
2035 | int using_gcc_plt_call = 1; | |
2036 | ||
53a5351d JM |
2037 | #ifdef GDB_TARGET_IS_HPPA_20W |
2038 | /* We currently use completely different code for the PA2.0W inferior | |
2039 | function call sequences. This needs to be cleaned up. */ | |
2040 | { | |
2041 | CORE_ADDR pcsqh, pcsqt, pcoqh, pcoqt, sr5; | |
2042 | struct target_waitstatus w; | |
2043 | int inst1, inst2; | |
2044 | char buf[4]; | |
2045 | int status; | |
2046 | struct objfile *objfile; | |
2047 | ||
2048 | /* We can not modify the PC space queues directly, so we start | |
2049 | up the inferior and execute a couple instructions to set the | |
2050 | space queues so that they point to the call dummy in the stack. */ | |
2051 | pcsqh = read_register (PCSQ_HEAD_REGNUM); | |
2052 | sr5 = read_register (SR5_REGNUM); | |
2053 | if (1) | |
2054 | { | |
2055 | pcoqh = read_register (PCOQ_HEAD_REGNUM); | |
2056 | pcoqt = read_register (PCOQ_TAIL_REGNUM); | |
2057 | if (target_read_memory (pcoqh, buf, 4) != 0) | |
2058 | error ("Couldn't modify space queue\n"); | |
2059 | inst1 = extract_unsigned_integer (buf, 4); | |
2060 | ||
2061 | if (target_read_memory (pcoqt, buf, 4) != 0) | |
2062 | error ("Couldn't modify space queue\n"); | |
2063 | inst2 = extract_unsigned_integer (buf, 4); | |
2064 | ||
2065 | /* BVE (r1) */ | |
2066 | *((int *) buf) = 0xe820d000; | |
2067 | if (target_write_memory (pcoqh, buf, 4) != 0) | |
2068 | error ("Couldn't modify space queue\n"); | |
2069 | ||
2070 | /* NOP */ | |
2071 | *((int *) buf) = 0x08000240; | |
2072 | if (target_write_memory (pcoqt, buf, 4) != 0) | |
2073 | { | |
2074 | *((int *) buf) = inst1; | |
2075 | target_write_memory (pcoqh, buf, 4); | |
2076 | error ("Couldn't modify space queue\n"); | |
2077 | } | |
2078 | ||
2079 | write_register (1, pc); | |
2080 | ||
2081 | /* Single step twice, the BVE instruction will set the space queue | |
2082 | such that it points to the PC value written immediately above | |
2083 | (ie the call dummy). */ | |
2084 | resume (1, 0); | |
39f77062 | 2085 | target_wait (inferior_ptid, &w); |
53a5351d | 2086 | resume (1, 0); |
39f77062 | 2087 | target_wait (inferior_ptid, &w); |
53a5351d JM |
2088 | |
2089 | /* Restore the two instructions at the old PC locations. */ | |
2090 | *((int *) buf) = inst1; | |
2091 | target_write_memory (pcoqh, buf, 4); | |
2092 | *((int *) buf) = inst2; | |
2093 | target_write_memory (pcoqt, buf, 4); | |
2094 | } | |
2095 | ||
2096 | /* The call dummy wants the ultimate destination address initially | |
2097 | in register %r5. */ | |
2098 | write_register (5, fun); | |
2099 | ||
2100 | /* We need to see if this objfile has a different DP value than our | |
c2c6d25f | 2101 | own (it could be a shared library for example). */ |
53a5351d JM |
2102 | ALL_OBJFILES (objfile) |
2103 | { | |
2104 | struct obj_section *s; | |
2105 | obj_private_data_t *obj_private; | |
2106 | ||
2107 | /* See if FUN is in any section within this shared library. */ | |
2108 | for (s = objfile->sections; s < objfile->sections_end; s++) | |
2109 | if (s->addr <= fun && fun < s->endaddr) | |
2110 | break; | |
2111 | ||
2112 | if (s >= objfile->sections_end) | |
2113 | continue; | |
2114 | ||
2115 | obj_private = (obj_private_data_t *) objfile->obj_private; | |
2116 | ||
2117 | /* The DP value may be different for each objfile. But within an | |
2118 | objfile each function uses the same dp value. Thus we do not need | |
2119 | to grope around the opd section looking for dp values. | |
2120 | ||
2121 | ?!? This is not strictly correct since we may be in a shared library | |
2122 | and want to call back into the main program. To make that case | |
2123 | work correctly we need to set obj_private->dp for the main program's | |
2124 | objfile, then remove this conditional. */ | |
2125 | if (obj_private->dp) | |
2126 | write_register (27, obj_private->dp); | |
2127 | break; | |
2128 | } | |
2129 | return pc; | |
2130 | } | |
2131 | #endif | |
2132 | ||
2133 | #ifndef GDB_TARGET_IS_HPPA_20W | |
cce74817 | 2134 | /* Prefer __gcc_plt_call over the HP supplied routine because |
c5aa993b | 2135 | __gcc_plt_call works for any number of arguments. */ |
c906108c | 2136 | trampoline = NULL; |
cce74817 JM |
2137 | if (lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL) == NULL) |
2138 | using_gcc_plt_call = 0; | |
2139 | ||
c906108c SS |
2140 | msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL); |
2141 | if (msymbol == NULL) | |
cce74817 | 2142 | error ("Can't find an address for $$dyncall trampoline"); |
c906108c SS |
2143 | |
2144 | dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
2145 | ||
2146 | /* FUN could be a procedure label, in which case we have to get | |
cce74817 JM |
2147 | its real address and the value of its GOT/DP if we plan to |
2148 | call the routine via gcc_plt_call. */ | |
2149 | if ((fun & 0x2) && using_gcc_plt_call) | |
c906108c SS |
2150 | { |
2151 | /* Get the GOT/DP value for the target function. It's | |
c5aa993b JM |
2152 | at *(fun+4). Note the call dummy is *NOT* allowed to |
2153 | trash %r19 before calling the target function. */ | |
53a5351d JM |
2154 | write_register (19, read_memory_integer ((fun & ~0x3) + 4, |
2155 | REGISTER_SIZE)); | |
c906108c SS |
2156 | |
2157 | /* Now get the real address for the function we are calling, it's | |
c5aa993b | 2158 | at *fun. */ |
53a5351d JM |
2159 | fun = (CORE_ADDR) read_memory_integer (fun & ~0x3, |
2160 | TARGET_PTR_BIT / 8); | |
c906108c SS |
2161 | } |
2162 | else | |
2163 | { | |
2164 | ||
2165 | #ifndef GDB_TARGET_IS_PA_ELF | |
cce74817 | 2166 | /* FUN could be an export stub, the real address of a function, or |
c5aa993b JM |
2167 | a PLABEL. When using gcc's PLT call routine we must call an import |
2168 | stub rather than the export stub or real function for lazy binding | |
2169 | to work correctly | |
cce74817 | 2170 | |
39f77062 | 2171 | If we are using the gcc PLT call routine, then we need to |
c5aa993b | 2172 | get the import stub for the target function. */ |
cce74817 | 2173 | if (using_gcc_plt_call && som_solib_get_got_by_pc (fun)) |
c906108c SS |
2174 | { |
2175 | struct objfile *objfile; | |
2176 | struct minimal_symbol *funsymbol, *stub_symbol; | |
2177 | CORE_ADDR newfun = 0; | |
2178 | ||
2179 | funsymbol = lookup_minimal_symbol_by_pc (fun); | |
2180 | if (!funsymbol) | |
4ce44c66 | 2181 | error ("Unable to find minimal symbol for target function.\n"); |
c906108c SS |
2182 | |
2183 | /* Search all the object files for an import symbol with the | |
2184 | right name. */ | |
2185 | ALL_OBJFILES (objfile) | |
c5aa993b JM |
2186 | { |
2187 | stub_symbol | |
2188 | = lookup_minimal_symbol_solib_trampoline | |
2189 | (SYMBOL_NAME (funsymbol), NULL, objfile); | |
2190 | ||
2191 | if (!stub_symbol) | |
2192 | stub_symbol = lookup_minimal_symbol (SYMBOL_NAME (funsymbol), | |
2193 | NULL, objfile); | |
2194 | ||
2195 | /* Found a symbol with the right name. */ | |
2196 | if (stub_symbol) | |
2197 | { | |
2198 | struct unwind_table_entry *u; | |
2199 | /* It must be a shared library trampoline. */ | |
2200 | if (MSYMBOL_TYPE (stub_symbol) != mst_solib_trampoline) | |
2201 | continue; | |
2202 | ||
2203 | /* It must also be an import stub. */ | |
2204 | u = find_unwind_entry (SYMBOL_VALUE (stub_symbol)); | |
6426a772 JM |
2205 | if (u == NULL |
2206 | || (u->stub_unwind.stub_type != IMPORT | |
2207 | #ifdef GDB_NATIVE_HPUX_11 | |
2208 | /* Sigh. The hpux 10.20 dynamic linker will blow | |
2209 | chunks if we perform a call to an unbound function | |
2210 | via the IMPORT_SHLIB stub. The hpux 11.00 dynamic | |
2211 | linker will blow chunks if we do not call the | |
2212 | unbound function via the IMPORT_SHLIB stub. | |
2213 | ||
2214 | We currently have no way to select bevahior on just | |
2215 | the target. However, we only support HPUX/SOM in | |
2216 | native mode. So we conditinalize on a native | |
2217 | #ifdef. Ugly. Ugly. Ugly */ | |
2218 | && u->stub_unwind.stub_type != IMPORT_SHLIB | |
2219 | #endif | |
2220 | )) | |
c5aa993b JM |
2221 | continue; |
2222 | ||
2223 | /* OK. Looks like the correct import stub. */ | |
2224 | newfun = SYMBOL_VALUE (stub_symbol); | |
2225 | fun = newfun; | |
6426a772 JM |
2226 | |
2227 | /* If we found an IMPORT stub, then we want to stop | |
2228 | searching now. If we found an IMPORT_SHLIB, we want | |
2229 | to continue the search in the hopes that we will find | |
2230 | an IMPORT stub. */ | |
2231 | if (u->stub_unwind.stub_type == IMPORT) | |
2232 | break; | |
c5aa993b JM |
2233 | } |
2234 | } | |
cce74817 JM |
2235 | |
2236 | /* Ouch. We did not find an import stub. Make an attempt to | |
2237 | do the right thing instead of just croaking. Most of the | |
2238 | time this will actually work. */ | |
c906108c SS |
2239 | if (newfun == 0) |
2240 | write_register (19, som_solib_get_got_by_pc (fun)); | |
cce74817 JM |
2241 | |
2242 | u = find_unwind_entry (fun); | |
c5aa993b | 2243 | if (u |
cce74817 JM |
2244 | && (u->stub_unwind.stub_type == IMPORT |
2245 | || u->stub_unwind.stub_type == IMPORT_SHLIB)) | |
2246 | trampoline = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL); | |
2247 | ||
2248 | /* If we found the import stub in the shared library, then we have | |
2249 | to set %r19 before we call the stub. */ | |
2250 | if (u && u->stub_unwind.stub_type == IMPORT_SHLIB) | |
2251 | write_register (19, som_solib_get_got_by_pc (fun)); | |
c906108c | 2252 | } |
c906108c SS |
2253 | #endif |
2254 | } | |
2255 | ||
cce74817 JM |
2256 | /* If we are calling into another load module then have sr4export call the |
2257 | magic __d_plt_call routine which is linked in from end.o. | |
c906108c | 2258 | |
cce74817 JM |
2259 | You can't use _sr4export to make the call as the value in sp-24 will get |
2260 | fried and you end up returning to the wrong location. You can't call the | |
2261 | target as the code to bind the PLT entry to a function can't return to a | |
2262 | stack address. | |
2263 | ||
2264 | Also, query the dynamic linker in the inferior to provide a suitable | |
2265 | PLABEL for the target function. */ | |
c5aa993b | 2266 | if (!using_gcc_plt_call) |
c906108c SS |
2267 | { |
2268 | CORE_ADDR new_fun; | |
2269 | ||
cce74817 | 2270 | /* Get a handle for the shared library containing FUN. Given the |
c5aa993b | 2271 | handle we can query the shared library for a PLABEL. */ |
cce74817 | 2272 | solib_handle = som_solib_get_solib_by_pc (fun); |
c906108c | 2273 | |
cce74817 | 2274 | if (solib_handle) |
c906108c | 2275 | { |
cce74817 | 2276 | struct minimal_symbol *fmsymbol = lookup_minimal_symbol_by_pc (fun); |
c906108c | 2277 | |
cce74817 JM |
2278 | trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL); |
2279 | ||
2280 | if (trampoline == NULL) | |
2281 | { | |
2282 | error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc."); | |
2283 | } | |
2284 | ||
2285 | /* This is where sr4export will jump to. */ | |
2286 | new_fun = SYMBOL_VALUE_ADDRESS (trampoline); | |
2287 | ||
2288 | /* If the function is in a shared library, then call __d_shl_get to | |
2289 | get a PLABEL for the target function. */ | |
2290 | new_stub = find_stub_with_shl_get (fmsymbol, solib_handle); | |
2291 | ||
c5aa993b | 2292 | if (new_stub == 0) |
cce74817 | 2293 | error ("Can't find an import stub for %s", SYMBOL_NAME (fmsymbol)); |
c906108c SS |
2294 | |
2295 | /* We have to store the address of the stub in __shlib_funcptr. */ | |
cce74817 | 2296 | msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL, |
c5aa993b | 2297 | (struct objfile *) NULL); |
c906108c | 2298 | |
cce74817 JM |
2299 | if (msymbol == NULL) |
2300 | error ("Can't find an address for __shlib_funcptr"); | |
2301 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
c5aa993b | 2302 | (char *) &new_stub, 4); |
c906108c SS |
2303 | |
2304 | /* We want sr4export to call __d_plt_call, so we claim it is | |
2305 | the final target. Clear trampoline. */ | |
cce74817 JM |
2306 | fun = new_fun; |
2307 | trampoline = NULL; | |
c906108c SS |
2308 | } |
2309 | } | |
2310 | ||
2311 | /* Store upper 21 bits of function address into ldil. fun will either be | |
2312 | the final target (most cases) or __d_plt_call when calling into a shared | |
2313 | library and __gcc_plt_call is not available. */ | |
2314 | store_unsigned_integer | |
2315 | (&dummy[FUNC_LDIL_OFFSET], | |
2316 | INSTRUCTION_SIZE, | |
2317 | deposit_21 (fun >> 11, | |
2318 | extract_unsigned_integer (&dummy[FUNC_LDIL_OFFSET], | |
2319 | INSTRUCTION_SIZE))); | |
2320 | ||
2321 | /* Store lower 11 bits of function address into ldo */ | |
2322 | store_unsigned_integer | |
2323 | (&dummy[FUNC_LDO_OFFSET], | |
2324 | INSTRUCTION_SIZE, | |
2325 | deposit_14 (fun & MASK_11, | |
2326 | extract_unsigned_integer (&dummy[FUNC_LDO_OFFSET], | |
2327 | INSTRUCTION_SIZE))); | |
2328 | #ifdef SR4EXPORT_LDIL_OFFSET | |
2329 | ||
2330 | { | |
2331 | CORE_ADDR trampoline_addr; | |
2332 | ||
2333 | /* We may still need sr4export's address too. */ | |
2334 | ||
2335 | if (trampoline == NULL) | |
2336 | { | |
2337 | msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2338 | if (msymbol == NULL) | |
cce74817 | 2339 | error ("Can't find an address for _sr4export trampoline"); |
c906108c SS |
2340 | |
2341 | trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
2342 | } | |
2343 | else | |
2344 | trampoline_addr = SYMBOL_VALUE_ADDRESS (trampoline); | |
2345 | ||
2346 | ||
2347 | /* Store upper 21 bits of trampoline's address into ldil */ | |
2348 | store_unsigned_integer | |
2349 | (&dummy[SR4EXPORT_LDIL_OFFSET], | |
2350 | INSTRUCTION_SIZE, | |
2351 | deposit_21 (trampoline_addr >> 11, | |
2352 | extract_unsigned_integer (&dummy[SR4EXPORT_LDIL_OFFSET], | |
2353 | INSTRUCTION_SIZE))); | |
2354 | ||
2355 | /* Store lower 11 bits of trampoline's address into ldo */ | |
2356 | store_unsigned_integer | |
2357 | (&dummy[SR4EXPORT_LDO_OFFSET], | |
2358 | INSTRUCTION_SIZE, | |
2359 | deposit_14 (trampoline_addr & MASK_11, | |
2360 | extract_unsigned_integer (&dummy[SR4EXPORT_LDO_OFFSET], | |
2361 | INSTRUCTION_SIZE))); | |
2362 | } | |
2363 | #endif | |
2364 | ||
2365 | write_register (22, pc); | |
2366 | ||
2367 | /* If we are in a syscall, then we should call the stack dummy | |
2368 | directly. $$dyncall is not needed as the kernel sets up the | |
2369 | space id registers properly based on the value in %r31. In | |
2370 | fact calling $$dyncall will not work because the value in %r22 | |
2371 | will be clobbered on the syscall exit path. | |
2372 | ||
2373 | Similarly if the current PC is in a shared library. Note however, | |
2374 | this scheme won't work if the shared library isn't mapped into | |
2375 | the same space as the stack. */ | |
2376 | if (flags & 2) | |
2377 | return pc; | |
2378 | #ifndef GDB_TARGET_IS_PA_ELF | |
39f77062 | 2379 | else if (som_solib_get_got_by_pc (target_read_pc (inferior_ptid))) |
c906108c SS |
2380 | return pc; |
2381 | #endif | |
2382 | else | |
2383 | return dyncall_addr; | |
53a5351d | 2384 | #endif |
c906108c SS |
2385 | } |
2386 | ||
2387 | ||
2388 | ||
2389 | ||
2390 | /* If the pid is in a syscall, then the FP register is not readable. | |
2391 | We'll return zero in that case, rather than attempting to read it | |
2392 | and cause a warning. */ | |
2393 | CORE_ADDR | |
fba45db2 | 2394 | target_read_fp (int pid) |
c906108c SS |
2395 | { |
2396 | int flags = read_register (FLAGS_REGNUM); | |
2397 | ||
c5aa993b JM |
2398 | if (flags & 2) |
2399 | { | |
2400 | return (CORE_ADDR) 0; | |
2401 | } | |
c906108c SS |
2402 | |
2403 | /* This is the only site that may directly read_register () the FP | |
2404 | register. All others must use TARGET_READ_FP (). */ | |
2405 | return read_register (FP_REGNUM); | |
2406 | } | |
2407 | ||
2408 | ||
2409 | /* Get the PC from %r31 if currently in a syscall. Also mask out privilege | |
2410 | bits. */ | |
2411 | ||
2412 | CORE_ADDR | |
39f77062 | 2413 | target_read_pc (ptid_t ptid) |
c906108c | 2414 | { |
39f77062 | 2415 | int flags = read_register_pid (FLAGS_REGNUM, ptid); |
c906108c SS |
2416 | |
2417 | /* The following test does not belong here. It is OS-specific, and belongs | |
2418 | in native code. */ | |
2419 | /* Test SS_INSYSCALL */ | |
2420 | if (flags & 2) | |
39f77062 | 2421 | return read_register_pid (31, ptid) & ~0x3; |
c906108c | 2422 | |
39f77062 | 2423 | return read_register_pid (PC_REGNUM, ptid) & ~0x3; |
c906108c SS |
2424 | } |
2425 | ||
2426 | /* Write out the PC. If currently in a syscall, then also write the new | |
2427 | PC value into %r31. */ | |
2428 | ||
2429 | void | |
39f77062 | 2430 | target_write_pc (CORE_ADDR v, ptid_t ptid) |
c906108c | 2431 | { |
39f77062 | 2432 | int flags = read_register_pid (FLAGS_REGNUM, ptid); |
c906108c SS |
2433 | |
2434 | /* The following test does not belong here. It is OS-specific, and belongs | |
2435 | in native code. */ | |
2436 | /* If in a syscall, then set %r31. Also make sure to get the | |
2437 | privilege bits set correctly. */ | |
2438 | /* Test SS_INSYSCALL */ | |
2439 | if (flags & 2) | |
39f77062 | 2440 | write_register_pid (31, v | 0x3, ptid); |
c906108c | 2441 | |
39f77062 KB |
2442 | write_register_pid (PC_REGNUM, v, ptid); |
2443 | write_register_pid (NPC_REGNUM, v + 4, ptid); | |
c906108c SS |
2444 | } |
2445 | ||
2446 | /* return the alignment of a type in bytes. Structures have the maximum | |
2447 | alignment required by their fields. */ | |
2448 | ||
2449 | static int | |
fba45db2 | 2450 | hppa_alignof (struct type *type) |
c906108c SS |
2451 | { |
2452 | int max_align, align, i; | |
2453 | CHECK_TYPEDEF (type); | |
2454 | switch (TYPE_CODE (type)) | |
2455 | { | |
2456 | case TYPE_CODE_PTR: | |
2457 | case TYPE_CODE_INT: | |
2458 | case TYPE_CODE_FLT: | |
2459 | return TYPE_LENGTH (type); | |
2460 | case TYPE_CODE_ARRAY: | |
2461 | return hppa_alignof (TYPE_FIELD_TYPE (type, 0)); | |
2462 | case TYPE_CODE_STRUCT: | |
2463 | case TYPE_CODE_UNION: | |
2464 | max_align = 1; | |
2465 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
2466 | { | |
2467 | /* Bit fields have no real alignment. */ | |
2468 | /* if (!TYPE_FIELD_BITPOS (type, i)) */ | |
c5aa993b | 2469 | if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */ |
c906108c SS |
2470 | { |
2471 | align = hppa_alignof (TYPE_FIELD_TYPE (type, i)); | |
2472 | max_align = max (max_align, align); | |
2473 | } | |
2474 | } | |
2475 | return max_align; | |
2476 | default: | |
2477 | return 4; | |
2478 | } | |
2479 | } | |
2480 | ||
2481 | /* Print the register regnum, or all registers if regnum is -1 */ | |
2482 | ||
2483 | void | |
fba45db2 | 2484 | pa_do_registers_info (int regnum, int fpregs) |
c906108c | 2485 | { |
c5aa993b | 2486 | char raw_regs[REGISTER_BYTES]; |
c906108c SS |
2487 | int i; |
2488 | ||
2489 | /* Make a copy of gdb's save area (may cause actual | |
2490 | reads from the target). */ | |
2491 | for (i = 0; i < NUM_REGS; i++) | |
cda5a58a | 2492 | frame_register_read (selected_frame, i, raw_regs + REGISTER_BYTE (i)); |
c906108c SS |
2493 | |
2494 | if (regnum == -1) | |
2495 | pa_print_registers (raw_regs, regnum, fpregs); | |
c5aa993b JM |
2496 | else if (regnum < FP4_REGNUM) |
2497 | { | |
2498 | long reg_val[2]; | |
2499 | ||
2500 | /* Why is the value not passed through "extract_signed_integer" | |
2501 | as in "pa_print_registers" below? */ | |
2502 | pa_register_look_aside (raw_regs, regnum, ®_val[0]); | |
2503 | ||
2504 | if (!is_pa_2) | |
2505 | { | |
ce414844 | 2506 | printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]); |
c5aa993b | 2507 | } |
c906108c | 2508 | else |
c5aa993b JM |
2509 | { |
2510 | /* Fancy % formats to prevent leading zeros. */ | |
2511 | if (reg_val[0] == 0) | |
ce414844 | 2512 | printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]); |
c5aa993b | 2513 | else |
ce414844 | 2514 | printf_unfiltered ("%s %lx%8.8lx\n", REGISTER_NAME (regnum), |
c5aa993b JM |
2515 | reg_val[0], reg_val[1]); |
2516 | } | |
c906108c | 2517 | } |
c906108c | 2518 | else |
c5aa993b JM |
2519 | /* Note that real floating point values only start at |
2520 | FP4_REGNUM. FP0 and up are just status and error | |
2521 | registers, which have integral (bit) values. */ | |
c906108c SS |
2522 | pa_print_fp_reg (regnum); |
2523 | } | |
2524 | ||
2525 | /********** new function ********************/ | |
2526 | void | |
fba45db2 KB |
2527 | pa_do_strcat_registers_info (int regnum, int fpregs, struct ui_file *stream, |
2528 | enum precision_type precision) | |
c906108c | 2529 | { |
c5aa993b | 2530 | char raw_regs[REGISTER_BYTES]; |
c906108c SS |
2531 | int i; |
2532 | ||
2533 | /* Make a copy of gdb's save area (may cause actual | |
c5aa993b | 2534 | reads from the target). */ |
c906108c | 2535 | for (i = 0; i < NUM_REGS; i++) |
cda5a58a | 2536 | frame_register_read (selected_frame, i, raw_regs + REGISTER_BYTE (i)); |
c906108c SS |
2537 | |
2538 | if (regnum == -1) | |
2539 | pa_strcat_registers (raw_regs, regnum, fpregs, stream); | |
2540 | ||
c5aa993b JM |
2541 | else if (regnum < FP4_REGNUM) |
2542 | { | |
2543 | long reg_val[2]; | |
2544 | ||
2545 | /* Why is the value not passed through "extract_signed_integer" | |
2546 | as in "pa_print_registers" below? */ | |
2547 | pa_register_look_aside (raw_regs, regnum, ®_val[0]); | |
c906108c | 2548 | |
c5aa993b JM |
2549 | if (!is_pa_2) |
2550 | { | |
ce414844 | 2551 | fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum), reg_val[1]); |
c5aa993b | 2552 | } |
c906108c | 2553 | else |
c5aa993b JM |
2554 | { |
2555 | /* Fancy % formats to prevent leading zeros. */ | |
2556 | if (reg_val[0] == 0) | |
ce414844 | 2557 | fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum), |
c5aa993b JM |
2558 | reg_val[1]); |
2559 | else | |
ce414844 | 2560 | fprintf_unfiltered (stream, "%s %lx%8.8lx", REGISTER_NAME (regnum), |
c5aa993b JM |
2561 | reg_val[0], reg_val[1]); |
2562 | } | |
c906108c | 2563 | } |
c906108c | 2564 | else |
c5aa993b JM |
2565 | /* Note that real floating point values only start at |
2566 | FP4_REGNUM. FP0 and up are just status and error | |
2567 | registers, which have integral (bit) values. */ | |
c906108c SS |
2568 | pa_strcat_fp_reg (regnum, stream, precision); |
2569 | } | |
2570 | ||
2571 | /* If this is a PA2.0 machine, fetch the real 64-bit register | |
2572 | value. Otherwise use the info from gdb's saved register area. | |
2573 | ||
2574 | Note that reg_val is really expected to be an array of longs, | |
2575 | with two elements. */ | |
2576 | static void | |
fba45db2 | 2577 | pa_register_look_aside (char *raw_regs, int regnum, long *raw_val) |
c906108c | 2578 | { |
c5aa993b | 2579 | static int know_which = 0; /* False */ |
c906108c | 2580 | |
c5aa993b | 2581 | int regaddr; |
c906108c SS |
2582 | unsigned int offset; |
2583 | register int i; | |
c5aa993b JM |
2584 | int start; |
2585 | ||
2586 | ||
c906108c SS |
2587 | char buf[MAX_REGISTER_RAW_SIZE]; |
2588 | long long reg_val; | |
2589 | ||
c5aa993b JM |
2590 | if (!know_which) |
2591 | { | |
2592 | if (CPU_PA_RISC2_0 == sysconf (_SC_CPU_VERSION)) | |
2593 | { | |
2594 | is_pa_2 = (1 == 1); | |
2595 | } | |
2596 | ||
2597 | know_which = 1; /* True */ | |
2598 | } | |
c906108c SS |
2599 | |
2600 | raw_val[0] = 0; | |
2601 | raw_val[1] = 0; | |
2602 | ||
c5aa993b JM |
2603 | if (!is_pa_2) |
2604 | { | |
2605 | raw_val[1] = *(long *) (raw_regs + REGISTER_BYTE (regnum)); | |
c906108c | 2606 | return; |
c5aa993b | 2607 | } |
c906108c SS |
2608 | |
2609 | /* Code below copied from hppah-nat.c, with fixes for wide | |
2610 | registers, using different area of save_state, etc. */ | |
2611 | if (regnum == FLAGS_REGNUM || regnum >= FP0_REGNUM || | |
c5aa993b JM |
2612 | !HAVE_STRUCT_SAVE_STATE_T || !HAVE_STRUCT_MEMBER_SS_WIDE) |
2613 | { | |
c906108c | 2614 | /* Use narrow regs area of save_state and default macro. */ |
c5aa993b JM |
2615 | offset = U_REGS_OFFSET; |
2616 | regaddr = register_addr (regnum, offset); | |
2617 | start = 1; | |
2618 | } | |
2619 | else | |
2620 | { | |
c906108c SS |
2621 | /* Use wide regs area, and calculate registers as 8 bytes wide. |
2622 | ||
2623 | We'd like to do this, but current version of "C" doesn't | |
2624 | permit "offsetof": | |
2625 | ||
c5aa993b | 2626 | offset = offsetof(save_state_t, ss_wide); |
c906108c SS |
2627 | |
2628 | Note that to avoid "C" doing typed pointer arithmetic, we | |
2629 | have to cast away the type in our offset calculation: | |
2630 | otherwise we get an offset of 1! */ | |
2631 | ||
7a292a7a | 2632 | /* NB: save_state_t is not available before HPUX 9. |
c5aa993b | 2633 | The ss_wide field is not available previous to HPUX 10.20, |
7a292a7a SS |
2634 | so to avoid compile-time warnings, we only compile this for |
2635 | PA 2.0 processors. This control path should only be followed | |
2636 | if we're debugging a PA 2.0 processor, so this should not cause | |
2637 | problems. */ | |
2638 | ||
c906108c SS |
2639 | /* #if the following code out so that this file can still be |
2640 | compiled on older HPUX boxes (< 10.20) which don't have | |
2641 | this structure/structure member. */ | |
2642 | #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1 | |
2643 | save_state_t temp; | |
2644 | ||
2645 | offset = ((int) &temp.ss_wide) - ((int) &temp); | |
2646 | regaddr = offset + regnum * 8; | |
c5aa993b | 2647 | start = 0; |
c906108c | 2648 | #endif |
c5aa993b JM |
2649 | } |
2650 | ||
2651 | for (i = start; i < 2; i++) | |
c906108c SS |
2652 | { |
2653 | errno = 0; | |
39f77062 | 2654 | raw_val[i] = call_ptrace (PT_RUREGS, PIDGET (inferior_ptid), |
c5aa993b | 2655 | (PTRACE_ARG3_TYPE) regaddr, 0); |
c906108c SS |
2656 | if (errno != 0) |
2657 | { | |
2658 | /* Warning, not error, in case we are attached; sometimes the | |
2659 | kernel doesn't let us at the registers. */ | |
2660 | char *err = safe_strerror (errno); | |
2661 | char *msg = alloca (strlen (err) + 128); | |
2662 | sprintf (msg, "reading register %s: %s", REGISTER_NAME (regnum), err); | |
2663 | warning (msg); | |
2664 | goto error_exit; | |
2665 | } | |
2666 | ||
2667 | regaddr += sizeof (long); | |
2668 | } | |
c5aa993b | 2669 | |
c906108c | 2670 | if (regnum == PCOQ_HEAD_REGNUM || regnum == PCOQ_TAIL_REGNUM) |
c5aa993b | 2671 | raw_val[1] &= ~0x3; /* I think we're masking out space bits */ |
c906108c SS |
2672 | |
2673 | error_exit: | |
2674 | ; | |
2675 | } | |
2676 | ||
2677 | /* "Info all-reg" command */ | |
c5aa993b | 2678 | |
c906108c | 2679 | static void |
fba45db2 | 2680 | pa_print_registers (char *raw_regs, int regnum, int fpregs) |
c906108c | 2681 | { |
c5aa993b | 2682 | int i, j; |
adf40b2e JM |
2683 | /* Alas, we are compiled so that "long long" is 32 bits */ |
2684 | long raw_val[2]; | |
c906108c | 2685 | long long_val; |
a0b3c4fd | 2686 | int rows = 48, columns = 2; |
c906108c | 2687 | |
adf40b2e | 2688 | for (i = 0; i < rows; i++) |
c906108c | 2689 | { |
adf40b2e | 2690 | for (j = 0; j < columns; j++) |
c906108c | 2691 | { |
adf40b2e JM |
2692 | /* We display registers in column-major order. */ |
2693 | int regnum = i + j * rows; | |
2694 | ||
c5aa993b JM |
2695 | /* Q: Why is the value passed through "extract_signed_integer", |
2696 | while above, in "pa_do_registers_info" it isn't? | |
2697 | A: ? */ | |
adf40b2e | 2698 | pa_register_look_aside (raw_regs, regnum, &raw_val[0]); |
c5aa993b JM |
2699 | |
2700 | /* Even fancier % formats to prevent leading zeros | |
2701 | and still maintain the output in columns. */ | |
2702 | if (!is_pa_2) | |
2703 | { | |
2704 | /* Being big-endian, on this machine the low bits | |
2705 | (the ones we want to look at) are in the second longword. */ | |
2706 | long_val = extract_signed_integer (&raw_val[1], 4); | |
ce414844 | 2707 | printf_filtered ("%10.10s: %8lx ", |
adf40b2e | 2708 | REGISTER_NAME (regnum), long_val); |
c5aa993b JM |
2709 | } |
2710 | else | |
2711 | { | |
2712 | /* raw_val = extract_signed_integer(&raw_val, 8); */ | |
2713 | if (raw_val[0] == 0) | |
ce414844 | 2714 | printf_filtered ("%10.10s: %8lx ", |
adf40b2e | 2715 | REGISTER_NAME (regnum), raw_val[1]); |
c5aa993b | 2716 | else |
ce414844 | 2717 | printf_filtered ("%10.10s: %8lx%8.8lx ", |
a0b3c4fd | 2718 | REGISTER_NAME (regnum), |
c5aa993b JM |
2719 | raw_val[0], raw_val[1]); |
2720 | } | |
c906108c SS |
2721 | } |
2722 | printf_unfiltered ("\n"); | |
2723 | } | |
c5aa993b | 2724 | |
c906108c | 2725 | if (fpregs) |
c5aa993b | 2726 | for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ |
c906108c SS |
2727 | pa_print_fp_reg (i); |
2728 | } | |
2729 | ||
c5aa993b | 2730 | /************* new function ******************/ |
c906108c | 2731 | static void |
fba45db2 KB |
2732 | pa_strcat_registers (char *raw_regs, int regnum, int fpregs, |
2733 | struct ui_file *stream) | |
c906108c | 2734 | { |
c5aa993b JM |
2735 | int i, j; |
2736 | long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */ | |
c906108c SS |
2737 | long long_val; |
2738 | enum precision_type precision; | |
2739 | ||
2740 | precision = unspecified_precision; | |
2741 | ||
2742 | for (i = 0; i < 18; i++) | |
2743 | { | |
2744 | for (j = 0; j < 4; j++) | |
2745 | { | |
c5aa993b JM |
2746 | /* Q: Why is the value passed through "extract_signed_integer", |
2747 | while above, in "pa_do_registers_info" it isn't? | |
2748 | A: ? */ | |
2749 | pa_register_look_aside (raw_regs, i + (j * 18), &raw_val[0]); | |
2750 | ||
2751 | /* Even fancier % formats to prevent leading zeros | |
2752 | and still maintain the output in columns. */ | |
2753 | if (!is_pa_2) | |
2754 | { | |
2755 | /* Being big-endian, on this machine the low bits | |
2756 | (the ones we want to look at) are in the second longword. */ | |
2757 | long_val = extract_signed_integer (&raw_val[1], 4); | |
ce414844 AC |
2758 | fprintf_filtered (stream, "%8.8s: %8lx ", |
2759 | REGISTER_NAME (i + (j * 18)), long_val); | |
c5aa993b JM |
2760 | } |
2761 | else | |
2762 | { | |
2763 | /* raw_val = extract_signed_integer(&raw_val, 8); */ | |
2764 | if (raw_val[0] == 0) | |
ce414844 AC |
2765 | fprintf_filtered (stream, "%8.8s: %8lx ", |
2766 | REGISTER_NAME (i + (j * 18)), raw_val[1]); | |
c5aa993b | 2767 | else |
ce414844 AC |
2768 | fprintf_filtered (stream, "%8.8s: %8lx%8.8lx ", |
2769 | REGISTER_NAME (i + (j * 18)), raw_val[0], | |
2770 | raw_val[1]); | |
c5aa993b | 2771 | } |
c906108c SS |
2772 | } |
2773 | fprintf_unfiltered (stream, "\n"); | |
2774 | } | |
c5aa993b | 2775 | |
c906108c | 2776 | if (fpregs) |
c5aa993b | 2777 | for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */ |
c906108c SS |
2778 | pa_strcat_fp_reg (i, stream, precision); |
2779 | } | |
2780 | ||
2781 | static void | |
fba45db2 | 2782 | pa_print_fp_reg (int i) |
c906108c SS |
2783 | { |
2784 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
2785 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
2786 | ||
2787 | /* Get 32bits of data. */ | |
cda5a58a | 2788 | frame_register_read (selected_frame, i, raw_buffer); |
c906108c SS |
2789 | |
2790 | /* Put it in the buffer. No conversions are ever necessary. */ | |
2791 | memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); | |
2792 | ||
2793 | fputs_filtered (REGISTER_NAME (i), gdb_stdout); | |
2794 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout); | |
2795 | fputs_filtered ("(single precision) ", gdb_stdout); | |
2796 | ||
2797 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, gdb_stdout, 0, | |
2798 | 1, 0, Val_pretty_default); | |
2799 | printf_filtered ("\n"); | |
2800 | ||
2801 | /* If "i" is even, then this register can also be a double-precision | |
2802 | FP register. Dump it out as such. */ | |
2803 | if ((i % 2) == 0) | |
2804 | { | |
2805 | /* Get the data in raw format for the 2nd half. */ | |
cda5a58a | 2806 | frame_register_read (selected_frame, i + 1, raw_buffer); |
c906108c SS |
2807 | |
2808 | /* Copy it into the appropriate part of the virtual buffer. */ | |
2809 | memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buffer, | |
2810 | REGISTER_RAW_SIZE (i)); | |
2811 | ||
2812 | /* Dump it as a double. */ | |
2813 | fputs_filtered (REGISTER_NAME (i), gdb_stdout); | |
2814 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout); | |
2815 | fputs_filtered ("(double precision) ", gdb_stdout); | |
2816 | ||
2817 | val_print (builtin_type_double, virtual_buffer, 0, 0, gdb_stdout, 0, | |
2818 | 1, 0, Val_pretty_default); | |
2819 | printf_filtered ("\n"); | |
2820 | } | |
2821 | } | |
2822 | ||
2823 | /*************** new function ***********************/ | |
2824 | static void | |
fba45db2 | 2825 | pa_strcat_fp_reg (int i, struct ui_file *stream, enum precision_type precision) |
c906108c SS |
2826 | { |
2827 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
2828 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; | |
2829 | ||
2830 | fputs_filtered (REGISTER_NAME (i), stream); | |
2831 | print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), stream); | |
2832 | ||
2833 | /* Get 32bits of data. */ | |
cda5a58a | 2834 | frame_register_read (selected_frame, i, raw_buffer); |
c906108c SS |
2835 | |
2836 | /* Put it in the buffer. No conversions are ever necessary. */ | |
2837 | memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i)); | |
2838 | ||
2839 | if (precision == double_precision && (i % 2) == 0) | |
2840 | { | |
2841 | ||
c5aa993b JM |
2842 | char raw_buf[MAX_REGISTER_RAW_SIZE]; |
2843 | ||
2844 | /* Get the data in raw format for the 2nd half. */ | |
cda5a58a | 2845 | frame_register_read (selected_frame, i + 1, raw_buf); |
c5aa993b JM |
2846 | |
2847 | /* Copy it into the appropriate part of the virtual buffer. */ | |
2848 | memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buf, REGISTER_RAW_SIZE (i)); | |
c906108c | 2849 | |
c5aa993b JM |
2850 | val_print (builtin_type_double, virtual_buffer, 0, 0, stream, 0, |
2851 | 1, 0, Val_pretty_default); | |
c906108c SS |
2852 | |
2853 | } | |
c5aa993b JM |
2854 | else |
2855 | { | |
2856 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, stream, 0, | |
2857 | 1, 0, Val_pretty_default); | |
2858 | } | |
c906108c SS |
2859 | |
2860 | } | |
2861 | ||
2862 | /* Return one if PC is in the call path of a trampoline, else return zero. | |
2863 | ||
2864 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
2865 | just shared library trampolines (import, export). */ | |
2866 | ||
2867 | int | |
fba45db2 | 2868 | in_solib_call_trampoline (CORE_ADDR pc, char *name) |
c906108c SS |
2869 | { |
2870 | struct minimal_symbol *minsym; | |
2871 | struct unwind_table_entry *u; | |
2872 | static CORE_ADDR dyncall = 0; | |
2873 | static CORE_ADDR sr4export = 0; | |
2874 | ||
c2c6d25f JM |
2875 | #ifdef GDB_TARGET_IS_HPPA_20W |
2876 | /* PA64 has a completely different stub/trampoline scheme. Is it | |
2877 | better? Maybe. It's certainly harder to determine with any | |
2878 | certainty that we are in a stub because we can not refer to the | |
2879 | unwinders to help. | |
2880 | ||
2881 | The heuristic is simple. Try to lookup the current PC value in th | |
2882 | minimal symbol table. If that fails, then assume we are not in a | |
2883 | stub and return. | |
2884 | ||
2885 | Then see if the PC value falls within the section bounds for the | |
2886 | section containing the minimal symbol we found in the first | |
2887 | step. If it does, then assume we are not in a stub and return. | |
2888 | ||
2889 | Finally peek at the instructions to see if they look like a stub. */ | |
2890 | { | |
2891 | struct minimal_symbol *minsym; | |
2892 | asection *sec; | |
2893 | CORE_ADDR addr; | |
2894 | int insn, i; | |
2895 | ||
2896 | minsym = lookup_minimal_symbol_by_pc (pc); | |
2897 | if (! minsym) | |
2898 | return 0; | |
2899 | ||
2900 | sec = SYMBOL_BFD_SECTION (minsym); | |
2901 | ||
2902 | if (sec->vma <= pc | |
2903 | && sec->vma + sec->_cooked_size < pc) | |
2904 | return 0; | |
2905 | ||
2906 | /* We might be in a stub. Peek at the instructions. Stubs are 3 | |
2907 | instructions long. */ | |
2908 | insn = read_memory_integer (pc, 4); | |
2909 | ||
b84a8afe | 2910 | /* Find out where we think we are within the stub. */ |
c2c6d25f JM |
2911 | if ((insn & 0xffffc00e) == 0x53610000) |
2912 | addr = pc; | |
2913 | else if ((insn & 0xffffffff) == 0xe820d000) | |
2914 | addr = pc - 4; | |
2915 | else if ((insn & 0xffffc00e) == 0x537b0000) | |
2916 | addr = pc - 8; | |
2917 | else | |
2918 | return 0; | |
2919 | ||
2920 | /* Now verify each insn in the range looks like a stub instruction. */ | |
2921 | insn = read_memory_integer (addr, 4); | |
2922 | if ((insn & 0xffffc00e) != 0x53610000) | |
2923 | return 0; | |
2924 | ||
2925 | /* Now verify each insn in the range looks like a stub instruction. */ | |
2926 | insn = read_memory_integer (addr + 4, 4); | |
2927 | if ((insn & 0xffffffff) != 0xe820d000) | |
2928 | return 0; | |
2929 | ||
2930 | /* Now verify each insn in the range looks like a stub instruction. */ | |
2931 | insn = read_memory_integer (addr + 8, 4); | |
2932 | if ((insn & 0xffffc00e) != 0x537b0000) | |
2933 | return 0; | |
2934 | ||
2935 | /* Looks like a stub. */ | |
2936 | return 1; | |
2937 | } | |
2938 | #endif | |
2939 | ||
2940 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a | |
2941 | new exec file */ | |
c906108c SS |
2942 | |
2943 | /* First see if PC is in one of the two C-library trampolines. */ | |
2944 | if (!dyncall) | |
2945 | { | |
2946 | minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
2947 | if (minsym) | |
2948 | dyncall = SYMBOL_VALUE_ADDRESS (minsym); | |
2949 | else | |
2950 | dyncall = -1; | |
2951 | } | |
2952 | ||
2953 | if (!sr4export) | |
2954 | { | |
2955 | minsym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
2956 | if (minsym) | |
2957 | sr4export = SYMBOL_VALUE_ADDRESS (minsym); | |
2958 | else | |
2959 | sr4export = -1; | |
2960 | } | |
2961 | ||
2962 | if (pc == dyncall || pc == sr4export) | |
2963 | return 1; | |
2964 | ||
104c1213 JM |
2965 | minsym = lookup_minimal_symbol_by_pc (pc); |
2966 | if (minsym && strcmp (SYMBOL_NAME (minsym), ".stub") == 0) | |
2967 | return 1; | |
2968 | ||
c906108c SS |
2969 | /* Get the unwind descriptor corresponding to PC, return zero |
2970 | if no unwind was found. */ | |
2971 | u = find_unwind_entry (pc); | |
2972 | if (!u) | |
2973 | return 0; | |
2974 | ||
2975 | /* If this isn't a linker stub, then return now. */ | |
2976 | if (u->stub_unwind.stub_type == 0) | |
2977 | return 0; | |
2978 | ||
2979 | /* By definition a long-branch stub is a call stub. */ | |
2980 | if (u->stub_unwind.stub_type == LONG_BRANCH) | |
2981 | return 1; | |
2982 | ||
2983 | /* The call and return path execute the same instructions within | |
2984 | an IMPORT stub! So an IMPORT stub is both a call and return | |
2985 | trampoline. */ | |
2986 | if (u->stub_unwind.stub_type == IMPORT) | |
2987 | return 1; | |
2988 | ||
2989 | /* Parameter relocation stubs always have a call path and may have a | |
2990 | return path. */ | |
2991 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
2992 | || u->stub_unwind.stub_type == EXPORT) | |
2993 | { | |
2994 | CORE_ADDR addr; | |
2995 | ||
2996 | /* Search forward from the current PC until we hit a branch | |
c5aa993b | 2997 | or the end of the stub. */ |
c906108c SS |
2998 | for (addr = pc; addr <= u->region_end; addr += 4) |
2999 | { | |
3000 | unsigned long insn; | |
3001 | ||
3002 | insn = read_memory_integer (addr, 4); | |
3003 | ||
3004 | /* Does it look like a bl? If so then it's the call path, if | |
3005 | we find a bv or be first, then we're on the return path. */ | |
3006 | if ((insn & 0xfc00e000) == 0xe8000000) | |
3007 | return 1; | |
3008 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
3009 | || (insn & 0xfc000000) == 0xe0000000) | |
3010 | return 0; | |
3011 | } | |
3012 | ||
3013 | /* Should never happen. */ | |
104c1213 JM |
3014 | warning ("Unable to find branch in parameter relocation stub.\n"); |
3015 | return 0; | |
c906108c SS |
3016 | } |
3017 | ||
3018 | /* Unknown stub type. For now, just return zero. */ | |
104c1213 | 3019 | return 0; |
c906108c SS |
3020 | } |
3021 | ||
3022 | /* Return one if PC is in the return path of a trampoline, else return zero. | |
3023 | ||
3024 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
3025 | just shared library trampolines (import, export). */ | |
3026 | ||
3027 | int | |
fba45db2 | 3028 | in_solib_return_trampoline (CORE_ADDR pc, char *name) |
c906108c SS |
3029 | { |
3030 | struct unwind_table_entry *u; | |
3031 | ||
3032 | /* Get the unwind descriptor corresponding to PC, return zero | |
3033 | if no unwind was found. */ | |
3034 | u = find_unwind_entry (pc); | |
3035 | if (!u) | |
3036 | return 0; | |
3037 | ||
3038 | /* If this isn't a linker stub or it's just a long branch stub, then | |
3039 | return zero. */ | |
3040 | if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) | |
3041 | return 0; | |
3042 | ||
3043 | /* The call and return path execute the same instructions within | |
3044 | an IMPORT stub! So an IMPORT stub is both a call and return | |
3045 | trampoline. */ | |
3046 | if (u->stub_unwind.stub_type == IMPORT) | |
3047 | return 1; | |
3048 | ||
3049 | /* Parameter relocation stubs always have a call path and may have a | |
3050 | return path. */ | |
3051 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
3052 | || u->stub_unwind.stub_type == EXPORT) | |
3053 | { | |
3054 | CORE_ADDR addr; | |
3055 | ||
3056 | /* Search forward from the current PC until we hit a branch | |
c5aa993b | 3057 | or the end of the stub. */ |
c906108c SS |
3058 | for (addr = pc; addr <= u->region_end; addr += 4) |
3059 | { | |
3060 | unsigned long insn; | |
3061 | ||
3062 | insn = read_memory_integer (addr, 4); | |
3063 | ||
3064 | /* Does it look like a bl? If so then it's the call path, if | |
3065 | we find a bv or be first, then we're on the return path. */ | |
3066 | if ((insn & 0xfc00e000) == 0xe8000000) | |
3067 | return 0; | |
3068 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
3069 | || (insn & 0xfc000000) == 0xe0000000) | |
3070 | return 1; | |
3071 | } | |
3072 | ||
3073 | /* Should never happen. */ | |
104c1213 JM |
3074 | warning ("Unable to find branch in parameter relocation stub.\n"); |
3075 | return 0; | |
c906108c SS |
3076 | } |
3077 | ||
3078 | /* Unknown stub type. For now, just return zero. */ | |
104c1213 | 3079 | return 0; |
c906108c SS |
3080 | |
3081 | } | |
3082 | ||
3083 | /* Figure out if PC is in a trampoline, and if so find out where | |
3084 | the trampoline will jump to. If not in a trampoline, return zero. | |
3085 | ||
3086 | Simple code examination probably is not a good idea since the code | |
3087 | sequences in trampolines can also appear in user code. | |
3088 | ||
3089 | We use unwinds and information from the minimal symbol table to | |
3090 | determine when we're in a trampoline. This won't work for ELF | |
3091 | (yet) since it doesn't create stub unwind entries. Whether or | |
3092 | not ELF will create stub unwinds or normal unwinds for linker | |
3093 | stubs is still being debated. | |
3094 | ||
3095 | This should handle simple calls through dyncall or sr4export, | |
3096 | long calls, argument relocation stubs, and dyncall/sr4export | |
3097 | calling an argument relocation stub. It even handles some stubs | |
3098 | used in dynamic executables. */ | |
3099 | ||
c906108c | 3100 | CORE_ADDR |
fba45db2 | 3101 | skip_trampoline_code (CORE_ADDR pc, char *name) |
c906108c SS |
3102 | { |
3103 | long orig_pc = pc; | |
3104 | long prev_inst, curr_inst, loc; | |
3105 | static CORE_ADDR dyncall = 0; | |
3106 | static CORE_ADDR dyncall_external = 0; | |
3107 | static CORE_ADDR sr4export = 0; | |
3108 | struct minimal_symbol *msym; | |
3109 | struct unwind_table_entry *u; | |
3110 | ||
c2c6d25f JM |
3111 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a |
3112 | new exec file */ | |
c906108c SS |
3113 | |
3114 | if (!dyncall) | |
3115 | { | |
3116 | msym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
3117 | if (msym) | |
3118 | dyncall = SYMBOL_VALUE_ADDRESS (msym); | |
3119 | else | |
3120 | dyncall = -1; | |
3121 | } | |
3122 | ||
3123 | if (!dyncall_external) | |
3124 | { | |
3125 | msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL); | |
3126 | if (msym) | |
3127 | dyncall_external = SYMBOL_VALUE_ADDRESS (msym); | |
3128 | else | |
3129 | dyncall_external = -1; | |
3130 | } | |
3131 | ||
3132 | if (!sr4export) | |
3133 | { | |
3134 | msym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
3135 | if (msym) | |
3136 | sr4export = SYMBOL_VALUE_ADDRESS (msym); | |
3137 | else | |
3138 | sr4export = -1; | |
3139 | } | |
3140 | ||
3141 | /* Addresses passed to dyncall may *NOT* be the actual address | |
3142 | of the function. So we may have to do something special. */ | |
3143 | if (pc == dyncall) | |
3144 | { | |
3145 | pc = (CORE_ADDR) read_register (22); | |
3146 | ||
3147 | /* If bit 30 (counting from the left) is on, then pc is the address of | |
c5aa993b JM |
3148 | the PLT entry for this function, not the address of the function |
3149 | itself. Bit 31 has meaning too, but only for MPE. */ | |
c906108c | 3150 | if (pc & 0x2) |
53a5351d | 3151 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); |
c906108c SS |
3152 | } |
3153 | if (pc == dyncall_external) | |
3154 | { | |
3155 | pc = (CORE_ADDR) read_register (22); | |
53a5351d | 3156 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); |
c906108c SS |
3157 | } |
3158 | else if (pc == sr4export) | |
3159 | pc = (CORE_ADDR) (read_register (22)); | |
3160 | ||
3161 | /* Get the unwind descriptor corresponding to PC, return zero | |
3162 | if no unwind was found. */ | |
3163 | u = find_unwind_entry (pc); | |
3164 | if (!u) | |
3165 | return 0; | |
3166 | ||
3167 | /* If this isn't a linker stub, then return now. */ | |
3168 | /* elz: attention here! (FIXME) because of a compiler/linker | |
3169 | error, some stubs which should have a non zero stub_unwind.stub_type | |
3170 | have unfortunately a value of zero. So this function would return here | |
3171 | as if we were not in a trampoline. To fix this, we go look at the partial | |
3172 | symbol information, which reports this guy as a stub. | |
3173 | (FIXME): Unfortunately, we are not that lucky: it turns out that the | |
3174 | partial symbol information is also wrong sometimes. This is because | |
3175 | when it is entered (somread.c::som_symtab_read()) it can happen that | |
3176 | if the type of the symbol (from the som) is Entry, and the symbol is | |
3177 | in a shared library, then it can also be a trampoline. This would | |
3178 | be OK, except that I believe the way they decide if we are ina shared library | |
3179 | does not work. SOOOO..., even if we have a regular function w/o trampolines | |
3180 | its minimal symbol can be assigned type mst_solib_trampoline. | |
3181 | Also, if we find that the symbol is a real stub, then we fix the unwind | |
3182 | descriptor, and define the stub type to be EXPORT. | |
c5aa993b | 3183 | Hopefully this is correct most of the times. */ |
c906108c | 3184 | if (u->stub_unwind.stub_type == 0) |
c5aa993b | 3185 | { |
c906108c SS |
3186 | |
3187 | /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed | |
3188 | we can delete all the code which appears between the lines */ | |
3189 | /*--------------------------------------------------------------------------*/ | |
c5aa993b | 3190 | msym = lookup_minimal_symbol_by_pc (pc); |
c906108c | 3191 | |
c5aa993b JM |
3192 | if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) |
3193 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3194 | ||
3195 | else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) | |
3196 | { | |
3197 | struct objfile *objfile; | |
3198 | struct minimal_symbol *msymbol; | |
3199 | int function_found = 0; | |
3200 | ||
3201 | /* go look if there is another minimal symbol with the same name as | |
3202 | this one, but with type mst_text. This would happen if the msym | |
3203 | is an actual trampoline, in which case there would be another | |
3204 | symbol with the same name corresponding to the real function */ | |
3205 | ||
3206 | ALL_MSYMBOLS (objfile, msymbol) | |
3207 | { | |
3208 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
3209 | && STREQ (SYMBOL_NAME (msymbol), SYMBOL_NAME (msym))) | |
3210 | { | |
3211 | function_found = 1; | |
3212 | break; | |
3213 | } | |
3214 | } | |
3215 | ||
3216 | if (function_found) | |
3217 | /* the type of msym is correct (mst_solib_trampoline), but | |
3218 | the unwind info is wrong, so set it to the correct value */ | |
3219 | u->stub_unwind.stub_type = EXPORT; | |
3220 | else | |
3221 | /* the stub type info in the unwind is correct (this is not a | |
3222 | trampoline), but the msym type information is wrong, it | |
3223 | should be mst_text. So we need to fix the msym, and also | |
3224 | get out of this function */ | |
3225 | { | |
3226 | MSYMBOL_TYPE (msym) = mst_text; | |
3227 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3228 | } | |
3229 | } | |
c906108c | 3230 | |
c906108c | 3231 | /*--------------------------------------------------------------------------*/ |
c5aa993b | 3232 | } |
c906108c SS |
3233 | |
3234 | /* It's a stub. Search for a branch and figure out where it goes. | |
3235 | Note we have to handle multi insn branch sequences like ldil;ble. | |
3236 | Most (all?) other branches can be determined by examining the contents | |
3237 | of certain registers and the stack. */ | |
3238 | ||
3239 | loc = pc; | |
3240 | curr_inst = 0; | |
3241 | prev_inst = 0; | |
3242 | while (1) | |
3243 | { | |
3244 | /* Make sure we haven't walked outside the range of this stub. */ | |
3245 | if (u != find_unwind_entry (loc)) | |
3246 | { | |
3247 | warning ("Unable to find branch in linker stub"); | |
3248 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3249 | } | |
3250 | ||
3251 | prev_inst = curr_inst; | |
3252 | curr_inst = read_memory_integer (loc, 4); | |
3253 | ||
3254 | /* Does it look like a branch external using %r1? Then it's the | |
c5aa993b | 3255 | branch from the stub to the actual function. */ |
c906108c SS |
3256 | if ((curr_inst & 0xffe0e000) == 0xe0202000) |
3257 | { | |
3258 | /* Yup. See if the previous instruction loaded | |
3259 | a value into %r1. If so compute and return the jump address. */ | |
3260 | if ((prev_inst & 0xffe00000) == 0x20200000) | |
3261 | return (extract_21 (prev_inst) + extract_17 (curr_inst)) & ~0x3; | |
3262 | else | |
3263 | { | |
3264 | warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."); | |
3265 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3266 | } | |
3267 | } | |
3268 | ||
3269 | /* Does it look like a be 0(sr0,%r21)? OR | |
3270 | Does it look like a be, n 0(sr0,%r21)? OR | |
3271 | Does it look like a bve (r21)? (this is on PA2.0) | |
3272 | Does it look like a bve, n(r21)? (this is also on PA2.0) | |
3273 | That's the branch from an | |
c5aa993b | 3274 | import stub to an export stub. |
c906108c | 3275 | |
c5aa993b JM |
3276 | It is impossible to determine the target of the branch via |
3277 | simple examination of instructions and/or data (consider | |
3278 | that the address in the plabel may be the address of the | |
3279 | bind-on-reference routine in the dynamic loader). | |
c906108c | 3280 | |
c5aa993b | 3281 | So we have try an alternative approach. |
c906108c | 3282 | |
c5aa993b JM |
3283 | Get the name of the symbol at our current location; it should |
3284 | be a stub symbol with the same name as the symbol in the | |
3285 | shared library. | |
c906108c | 3286 | |
c5aa993b JM |
3287 | Then lookup a minimal symbol with the same name; we should |
3288 | get the minimal symbol for the target routine in the shared | |
3289 | library as those take precedence of import/export stubs. */ | |
c906108c | 3290 | if ((curr_inst == 0xe2a00000) || |
c5aa993b JM |
3291 | (curr_inst == 0xe2a00002) || |
3292 | (curr_inst == 0xeaa0d000) || | |
3293 | (curr_inst == 0xeaa0d002)) | |
c906108c SS |
3294 | { |
3295 | struct minimal_symbol *stubsym, *libsym; | |
3296 | ||
3297 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
3298 | if (stubsym == NULL) | |
3299 | { | |
ce414844 | 3300 | warning ("Unable to find symbol for 0x%lx", loc); |
c906108c SS |
3301 | return orig_pc == pc ? 0 : pc & ~0x3; |
3302 | } | |
3303 | ||
3304 | libsym = lookup_minimal_symbol (SYMBOL_NAME (stubsym), NULL, NULL); | |
3305 | if (libsym == NULL) | |
3306 | { | |
3307 | warning ("Unable to find library symbol for %s\n", | |
3308 | SYMBOL_NAME (stubsym)); | |
3309 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3310 | } | |
3311 | ||
3312 | return SYMBOL_VALUE (libsym); | |
3313 | } | |
3314 | ||
3315 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a | |
c5aa993b JM |
3316 | branch from the stub to the actual function. */ |
3317 | /*elz */ | |
c906108c SS |
3318 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 |
3319 | || (curr_inst & 0xffe0e000) == 0xe8000000 | |
c5aa993b | 3320 | || (curr_inst & 0xffe0e000) == 0xe800A000) |
c906108c SS |
3321 | return (loc + extract_17 (curr_inst) + 8) & ~0x3; |
3322 | ||
3323 | /* Does it look like bv (rp)? Note this depends on the | |
c5aa993b JM |
3324 | current stack pointer being the same as the stack |
3325 | pointer in the stub itself! This is a branch on from the | |
3326 | stub back to the original caller. */ | |
3327 | /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */ | |
c906108c SS |
3328 | else if ((curr_inst & 0xffe0f000) == 0xe840c000) |
3329 | { | |
3330 | /* Yup. See if the previous instruction loaded | |
3331 | rp from sp - 8. */ | |
3332 | if (prev_inst == 0x4bc23ff1) | |
3333 | return (read_memory_integer | |
3334 | (read_register (SP_REGNUM) - 8, 4)) & ~0x3; | |
3335 | else | |
3336 | { | |
3337 | warning ("Unable to find restore of %%rp before bv (%%rp)."); | |
3338 | return orig_pc == pc ? 0 : pc & ~0x3; | |
3339 | } | |
3340 | } | |
3341 | ||
3342 | /* elz: added this case to capture the new instruction | |
3343 | at the end of the return part of an export stub used by | |
3344 | the PA2.0: BVE, n (rp) */ | |
3345 | else if ((curr_inst & 0xffe0f000) == 0xe840d000) | |
3346 | { | |
c5aa993b | 3347 | return (read_memory_integer |
53a5351d | 3348 | (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; |
c906108c SS |
3349 | } |
3350 | ||
3351 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
c5aa993b | 3352 | the original caller from the stub. Used in dynamic executables. */ |
c906108c SS |
3353 | else if (curr_inst == 0xe0400002) |
3354 | { | |
3355 | /* The value we jump to is sitting in sp - 24. But that's | |
3356 | loaded several instructions before the be instruction. | |
3357 | I guess we could check for the previous instruction being | |
3358 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
c5aa993b | 3359 | return (read_memory_integer |
53a5351d | 3360 | (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; |
c906108c SS |
3361 | } |
3362 | ||
3363 | /* Haven't found the branch yet, but we're still in the stub. | |
c5aa993b | 3364 | Keep looking. */ |
c906108c SS |
3365 | loc += 4; |
3366 | } | |
3367 | } | |
3368 | ||
3369 | ||
3370 | /* For the given instruction (INST), return any adjustment it makes | |
3371 | to the stack pointer or zero for no adjustment. | |
3372 | ||
3373 | This only handles instructions commonly found in prologues. */ | |
3374 | ||
3375 | static int | |
fba45db2 | 3376 | prologue_inst_adjust_sp (unsigned long inst) |
c906108c SS |
3377 | { |
3378 | /* This must persist across calls. */ | |
3379 | static int save_high21; | |
3380 | ||
3381 | /* The most common way to perform a stack adjustment ldo X(sp),sp */ | |
3382 | if ((inst & 0xffffc000) == 0x37de0000) | |
3383 | return extract_14 (inst); | |
3384 | ||
3385 | /* stwm X,D(sp) */ | |
3386 | if ((inst & 0xffe00000) == 0x6fc00000) | |
3387 | return extract_14 (inst); | |
3388 | ||
104c1213 JM |
3389 | /* std,ma X,D(sp) */ |
3390 | if ((inst & 0xffe00008) == 0x73c00008) | |
d4f3574e | 3391 | return (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3); |
104c1213 | 3392 | |
c906108c SS |
3393 | /* addil high21,%r1; ldo low11,(%r1),%r30) |
3394 | save high bits in save_high21 for later use. */ | |
3395 | if ((inst & 0xffe00000) == 0x28200000) | |
3396 | { | |
3397 | save_high21 = extract_21 (inst); | |
3398 | return 0; | |
3399 | } | |
3400 | ||
3401 | if ((inst & 0xffff0000) == 0x343e0000) | |
3402 | return save_high21 + extract_14 (inst); | |
3403 | ||
3404 | /* fstws as used by the HP compilers. */ | |
3405 | if ((inst & 0xffffffe0) == 0x2fd01220) | |
3406 | return extract_5_load (inst); | |
3407 | ||
3408 | /* No adjustment. */ | |
3409 | return 0; | |
3410 | } | |
3411 | ||
3412 | /* Return nonzero if INST is a branch of some kind, else return zero. */ | |
3413 | ||
3414 | static int | |
fba45db2 | 3415 | is_branch (unsigned long inst) |
c906108c SS |
3416 | { |
3417 | switch (inst >> 26) | |
3418 | { | |
3419 | case 0x20: | |
3420 | case 0x21: | |
3421 | case 0x22: | |
3422 | case 0x23: | |
7be570e7 | 3423 | case 0x27: |
c906108c SS |
3424 | case 0x28: |
3425 | case 0x29: | |
3426 | case 0x2a: | |
3427 | case 0x2b: | |
7be570e7 | 3428 | case 0x2f: |
c906108c SS |
3429 | case 0x30: |
3430 | case 0x31: | |
3431 | case 0x32: | |
3432 | case 0x33: | |
3433 | case 0x38: | |
3434 | case 0x39: | |
3435 | case 0x3a: | |
7be570e7 | 3436 | case 0x3b: |
c906108c SS |
3437 | return 1; |
3438 | ||
3439 | default: | |
3440 | return 0; | |
3441 | } | |
3442 | } | |
3443 | ||
3444 | /* Return the register number for a GR which is saved by INST or | |
3445 | zero it INST does not save a GR. */ | |
3446 | ||
3447 | static int | |
fba45db2 | 3448 | inst_saves_gr (unsigned long inst) |
c906108c SS |
3449 | { |
3450 | /* Does it look like a stw? */ | |
7be570e7 JM |
3451 | if ((inst >> 26) == 0x1a || (inst >> 26) == 0x1b |
3452 | || (inst >> 26) == 0x1f | |
3453 | || ((inst >> 26) == 0x1f | |
3454 | && ((inst >> 6) == 0xa))) | |
3455 | return extract_5R_store (inst); | |
3456 | ||
3457 | /* Does it look like a std? */ | |
3458 | if ((inst >> 26) == 0x1c | |
3459 | || ((inst >> 26) == 0x03 | |
3460 | && ((inst >> 6) & 0xf) == 0xb)) | |
c906108c SS |
3461 | return extract_5R_store (inst); |
3462 | ||
3463 | /* Does it look like a stwm? GCC & HPC may use this in prologues. */ | |
3464 | if ((inst >> 26) == 0x1b) | |
3465 | return extract_5R_store (inst); | |
3466 | ||
3467 | /* Does it look like sth or stb? HPC versions 9.0 and later use these | |
3468 | too. */ | |
7be570e7 JM |
3469 | if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18 |
3470 | || ((inst >> 26) == 0x3 | |
3471 | && (((inst >> 6) & 0xf) == 0x8 | |
3472 | || (inst >> 6) & 0xf) == 0x9)) | |
c906108c | 3473 | return extract_5R_store (inst); |
c5aa993b | 3474 | |
c906108c SS |
3475 | return 0; |
3476 | } | |
3477 | ||
3478 | /* Return the register number for a FR which is saved by INST or | |
3479 | zero it INST does not save a FR. | |
3480 | ||
3481 | Note we only care about full 64bit register stores (that's the only | |
3482 | kind of stores the prologue will use). | |
3483 | ||
3484 | FIXME: What about argument stores with the HP compiler in ANSI mode? */ | |
3485 | ||
3486 | static int | |
fba45db2 | 3487 | inst_saves_fr (unsigned long inst) |
c906108c | 3488 | { |
7be570e7 | 3489 | /* is this an FSTD ? */ |
c906108c SS |
3490 | if ((inst & 0xfc00dfc0) == 0x2c001200) |
3491 | return extract_5r_store (inst); | |
7be570e7 JM |
3492 | if ((inst & 0xfc000002) == 0x70000002) |
3493 | return extract_5R_store (inst); | |
3494 | /* is this an FSTW ? */ | |
c906108c SS |
3495 | if ((inst & 0xfc00df80) == 0x24001200) |
3496 | return extract_5r_store (inst); | |
7be570e7 JM |
3497 | if ((inst & 0xfc000002) == 0x7c000000) |
3498 | return extract_5R_store (inst); | |
c906108c SS |
3499 | return 0; |
3500 | } | |
3501 | ||
3502 | /* Advance PC across any function entry prologue instructions | |
3503 | to reach some "real" code. | |
3504 | ||
3505 | Use information in the unwind table to determine what exactly should | |
3506 | be in the prologue. */ | |
3507 | ||
3508 | ||
3509 | CORE_ADDR | |
fba45db2 | 3510 | skip_prologue_hard_way (CORE_ADDR pc) |
c906108c SS |
3511 | { |
3512 | char buf[4]; | |
3513 | CORE_ADDR orig_pc = pc; | |
3514 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; | |
3515 | unsigned long args_stored, status, i, restart_gr, restart_fr; | |
3516 | struct unwind_table_entry *u; | |
3517 | ||
3518 | restart_gr = 0; | |
3519 | restart_fr = 0; | |
3520 | ||
3521 | restart: | |
3522 | u = find_unwind_entry (pc); | |
3523 | if (!u) | |
3524 | return pc; | |
3525 | ||
c5aa993b | 3526 | /* If we are not at the beginning of a function, then return now. */ |
c906108c SS |
3527 | if ((pc & ~0x3) != u->region_start) |
3528 | return pc; | |
3529 | ||
3530 | /* This is how much of a frame adjustment we need to account for. */ | |
3531 | stack_remaining = u->Total_frame_size << 3; | |
3532 | ||
3533 | /* Magic register saves we want to know about. */ | |
3534 | save_rp = u->Save_RP; | |
3535 | save_sp = u->Save_SP; | |
3536 | ||
3537 | /* An indication that args may be stored into the stack. Unfortunately | |
3538 | the HPUX compilers tend to set this in cases where no args were | |
3539 | stored too!. */ | |
3540 | args_stored = 1; | |
3541 | ||
3542 | /* Turn the Entry_GR field into a bitmask. */ | |
3543 | save_gr = 0; | |
3544 | for (i = 3; i < u->Entry_GR + 3; i++) | |
3545 | { | |
3546 | /* Frame pointer gets saved into a special location. */ | |
3547 | if (u->Save_SP && i == FP_REGNUM) | |
3548 | continue; | |
3549 | ||
3550 | save_gr |= (1 << i); | |
3551 | } | |
3552 | save_gr &= ~restart_gr; | |
3553 | ||
3554 | /* Turn the Entry_FR field into a bitmask too. */ | |
3555 | save_fr = 0; | |
3556 | for (i = 12; i < u->Entry_FR + 12; i++) | |
3557 | save_fr |= (1 << i); | |
3558 | save_fr &= ~restart_fr; | |
3559 | ||
3560 | /* Loop until we find everything of interest or hit a branch. | |
3561 | ||
3562 | For unoptimized GCC code and for any HP CC code this will never ever | |
3563 | examine any user instructions. | |
3564 | ||
3565 | For optimzied GCC code we're faced with problems. GCC will schedule | |
3566 | its prologue and make prologue instructions available for delay slot | |
3567 | filling. The end result is user code gets mixed in with the prologue | |
3568 | and a prologue instruction may be in the delay slot of the first branch | |
3569 | or call. | |
3570 | ||
3571 | Some unexpected things are expected with debugging optimized code, so | |
3572 | we allow this routine to walk past user instructions in optimized | |
3573 | GCC code. */ | |
3574 | while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0 | |
3575 | || args_stored) | |
3576 | { | |
3577 | unsigned int reg_num; | |
3578 | unsigned long old_stack_remaining, old_save_gr, old_save_fr; | |
3579 | unsigned long old_save_rp, old_save_sp, next_inst; | |
3580 | ||
3581 | /* Save copies of all the triggers so we can compare them later | |
c5aa993b | 3582 | (only for HPC). */ |
c906108c SS |
3583 | old_save_gr = save_gr; |
3584 | old_save_fr = save_fr; | |
3585 | old_save_rp = save_rp; | |
3586 | old_save_sp = save_sp; | |
3587 | old_stack_remaining = stack_remaining; | |
3588 | ||
3589 | status = target_read_memory (pc, buf, 4); | |
3590 | inst = extract_unsigned_integer (buf, 4); | |
c5aa993b | 3591 | |
c906108c SS |
3592 | /* Yow! */ |
3593 | if (status != 0) | |
3594 | return pc; | |
3595 | ||
3596 | /* Note the interesting effects of this instruction. */ | |
3597 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
3598 | ||
7be570e7 JM |
3599 | /* There are limited ways to store the return pointer into the |
3600 | stack. */ | |
3601 | if (inst == 0x6bc23fd9 || inst == 0x0fc212c1) | |
c906108c SS |
3602 | save_rp = 0; |
3603 | ||
104c1213 | 3604 | /* These are the only ways we save SP into the stack. At this time |
c5aa993b | 3605 | the HP compilers never bother to save SP into the stack. */ |
104c1213 JM |
3606 | if ((inst & 0xffffc000) == 0x6fc10000 |
3607 | || (inst & 0xffffc00c) == 0x73c10008) | |
c906108c SS |
3608 | save_sp = 0; |
3609 | ||
6426a772 JM |
3610 | /* Are we loading some register with an offset from the argument |
3611 | pointer? */ | |
3612 | if ((inst & 0xffe00000) == 0x37a00000 | |
3613 | || (inst & 0xffffffe0) == 0x081d0240) | |
3614 | { | |
3615 | pc += 4; | |
3616 | continue; | |
3617 | } | |
3618 | ||
c906108c SS |
3619 | /* Account for general and floating-point register saves. */ |
3620 | reg_num = inst_saves_gr (inst); | |
3621 | save_gr &= ~(1 << reg_num); | |
3622 | ||
3623 | /* Ugh. Also account for argument stores into the stack. | |
c5aa993b JM |
3624 | Unfortunately args_stored only tells us that some arguments |
3625 | where stored into the stack. Not how many or what kind! | |
c906108c | 3626 | |
c5aa993b JM |
3627 | This is a kludge as on the HP compiler sets this bit and it |
3628 | never does prologue scheduling. So once we see one, skip past | |
3629 | all of them. We have similar code for the fp arg stores below. | |
c906108c | 3630 | |
c5aa993b JM |
3631 | FIXME. Can still die if we have a mix of GR and FR argument |
3632 | stores! */ | |
6426a772 | 3633 | if (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26) |
c906108c | 3634 | { |
6426a772 | 3635 | while (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26) |
c906108c SS |
3636 | { |
3637 | pc += 4; | |
3638 | status = target_read_memory (pc, buf, 4); | |
3639 | inst = extract_unsigned_integer (buf, 4); | |
3640 | if (status != 0) | |
3641 | return pc; | |
3642 | reg_num = inst_saves_gr (inst); | |
3643 | } | |
3644 | args_stored = 0; | |
3645 | continue; | |
3646 | } | |
3647 | ||
3648 | reg_num = inst_saves_fr (inst); | |
3649 | save_fr &= ~(1 << reg_num); | |
3650 | ||
3651 | status = target_read_memory (pc + 4, buf, 4); | |
3652 | next_inst = extract_unsigned_integer (buf, 4); | |
c5aa993b | 3653 | |
c906108c SS |
3654 | /* Yow! */ |
3655 | if (status != 0) | |
3656 | return pc; | |
3657 | ||
3658 | /* We've got to be read to handle the ldo before the fp register | |
c5aa993b | 3659 | save. */ |
c906108c SS |
3660 | if ((inst & 0xfc000000) == 0x34000000 |
3661 | && inst_saves_fr (next_inst) >= 4 | |
6426a772 | 3662 | && inst_saves_fr (next_inst) <= (TARGET_PTR_BIT == 64 ? 11 : 7)) |
c906108c SS |
3663 | { |
3664 | /* So we drop into the code below in a reasonable state. */ | |
3665 | reg_num = inst_saves_fr (next_inst); | |
3666 | pc -= 4; | |
3667 | } | |
3668 | ||
3669 | /* Ugh. Also account for argument stores into the stack. | |
c5aa993b JM |
3670 | This is a kludge as on the HP compiler sets this bit and it |
3671 | never does prologue scheduling. So once we see one, skip past | |
3672 | all of them. */ | |
6426a772 | 3673 | if (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7)) |
c906108c | 3674 | { |
6426a772 | 3675 | while (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7)) |
c906108c SS |
3676 | { |
3677 | pc += 8; | |
3678 | status = target_read_memory (pc, buf, 4); | |
3679 | inst = extract_unsigned_integer (buf, 4); | |
3680 | if (status != 0) | |
3681 | return pc; | |
3682 | if ((inst & 0xfc000000) != 0x34000000) | |
3683 | break; | |
3684 | status = target_read_memory (pc + 4, buf, 4); | |
3685 | next_inst = extract_unsigned_integer (buf, 4); | |
3686 | if (status != 0) | |
3687 | return pc; | |
3688 | reg_num = inst_saves_fr (next_inst); | |
3689 | } | |
3690 | args_stored = 0; | |
3691 | continue; | |
3692 | } | |
3693 | ||
3694 | /* Quit if we hit any kind of branch. This can happen if a prologue | |
c5aa993b | 3695 | instruction is in the delay slot of the first call/branch. */ |
c906108c SS |
3696 | if (is_branch (inst)) |
3697 | break; | |
3698 | ||
3699 | /* What a crock. The HP compilers set args_stored even if no | |
c5aa993b JM |
3700 | arguments were stored into the stack (boo hiss). This could |
3701 | cause this code to then skip a bunch of user insns (up to the | |
3702 | first branch). | |
3703 | ||
3704 | To combat this we try to identify when args_stored was bogusly | |
3705 | set and clear it. We only do this when args_stored is nonzero, | |
3706 | all other resources are accounted for, and nothing changed on | |
3707 | this pass. */ | |
c906108c | 3708 | if (args_stored |
c5aa993b | 3709 | && !(save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) |
c906108c SS |
3710 | && old_save_gr == save_gr && old_save_fr == save_fr |
3711 | && old_save_rp == save_rp && old_save_sp == save_sp | |
3712 | && old_stack_remaining == stack_remaining) | |
3713 | break; | |
c5aa993b | 3714 | |
c906108c SS |
3715 | /* Bump the PC. */ |
3716 | pc += 4; | |
3717 | } | |
3718 | ||
3719 | /* We've got a tenative location for the end of the prologue. However | |
3720 | because of limitations in the unwind descriptor mechanism we may | |
3721 | have went too far into user code looking for the save of a register | |
3722 | that does not exist. So, if there registers we expected to be saved | |
3723 | but never were, mask them out and restart. | |
3724 | ||
3725 | This should only happen in optimized code, and should be very rare. */ | |
c5aa993b | 3726 | if (save_gr || (save_fr && !(restart_fr || restart_gr))) |
c906108c SS |
3727 | { |
3728 | pc = orig_pc; | |
3729 | restart_gr = save_gr; | |
3730 | restart_fr = save_fr; | |
3731 | goto restart; | |
3732 | } | |
3733 | ||
3734 | return pc; | |
3735 | } | |
3736 | ||
3737 | ||
7be570e7 JM |
3738 | /* Return the address of the PC after the last prologue instruction if |
3739 | we can determine it from the debug symbols. Else return zero. */ | |
c906108c SS |
3740 | |
3741 | static CORE_ADDR | |
fba45db2 | 3742 | after_prologue (CORE_ADDR pc) |
c906108c SS |
3743 | { |
3744 | struct symtab_and_line sal; | |
3745 | CORE_ADDR func_addr, func_end; | |
3746 | struct symbol *f; | |
3747 | ||
7be570e7 JM |
3748 | /* If we can not find the symbol in the partial symbol table, then |
3749 | there is no hope we can determine the function's start address | |
3750 | with this code. */ | |
c906108c | 3751 | if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
7be570e7 | 3752 | return 0; |
c906108c | 3753 | |
7be570e7 | 3754 | /* Get the line associated with FUNC_ADDR. */ |
c906108c SS |
3755 | sal = find_pc_line (func_addr, 0); |
3756 | ||
7be570e7 JM |
3757 | /* There are only two cases to consider. First, the end of the source line |
3758 | is within the function bounds. In that case we return the end of the | |
3759 | source line. Second is the end of the source line extends beyond the | |
3760 | bounds of the current function. We need to use the slow code to | |
3761 | examine instructions in that case. | |
c906108c | 3762 | |
7be570e7 JM |
3763 | Anything else is simply a bug elsewhere. Fixing it here is absolutely |
3764 | the wrong thing to do. In fact, it should be entirely possible for this | |
3765 | function to always return zero since the slow instruction scanning code | |
3766 | is supposed to *always* work. If it does not, then it is a bug. */ | |
3767 | if (sal.end < func_end) | |
3768 | return sal.end; | |
c5aa993b | 3769 | else |
7be570e7 | 3770 | return 0; |
c906108c SS |
3771 | } |
3772 | ||
3773 | /* To skip prologues, I use this predicate. Returns either PC itself | |
3774 | if the code at PC does not look like a function prologue; otherwise | |
3775 | returns an address that (if we're lucky) follows the prologue. If | |
3776 | LENIENT, then we must skip everything which is involved in setting | |
3777 | up the frame (it's OK to skip more, just so long as we don't skip | |
3778 | anything which might clobber the registers which are being saved. | |
3779 | Currently we must not skip more on the alpha, but we might the lenient | |
3780 | stuff some day. */ | |
3781 | ||
3782 | CORE_ADDR | |
fba45db2 | 3783 | hppa_skip_prologue (CORE_ADDR pc) |
c906108c | 3784 | { |
c5aa993b JM |
3785 | unsigned long inst; |
3786 | int offset; | |
3787 | CORE_ADDR post_prologue_pc; | |
3788 | char buf[4]; | |
c906108c | 3789 | |
c5aa993b JM |
3790 | /* See if we can determine the end of the prologue via the symbol table. |
3791 | If so, then return either PC, or the PC after the prologue, whichever | |
3792 | is greater. */ | |
c906108c | 3793 | |
c5aa993b | 3794 | post_prologue_pc = after_prologue (pc); |
c906108c | 3795 | |
7be570e7 JM |
3796 | /* If after_prologue returned a useful address, then use it. Else |
3797 | fall back on the instruction skipping code. | |
3798 | ||
3799 | Some folks have claimed this causes problems because the breakpoint | |
3800 | may be the first instruction of the prologue. If that happens, then | |
3801 | the instruction skipping code has a bug that needs to be fixed. */ | |
c5aa993b JM |
3802 | if (post_prologue_pc != 0) |
3803 | return max (pc, post_prologue_pc); | |
c5aa993b JM |
3804 | else |
3805 | return (skip_prologue_hard_way (pc)); | |
c906108c SS |
3806 | } |
3807 | ||
3808 | /* Put here the code to store, into a struct frame_saved_regs, | |
3809 | the addresses of the saved registers of frame described by FRAME_INFO. | |
3810 | This includes special registers such as pc and fp saved in special | |
3811 | ways in the stack frame. sp is even more special: | |
3812 | the address we return for it IS the sp for the next frame. */ | |
3813 | ||
3814 | void | |
fba45db2 KB |
3815 | hppa_frame_find_saved_regs (struct frame_info *frame_info, |
3816 | struct frame_saved_regs *frame_saved_regs) | |
c906108c SS |
3817 | { |
3818 | CORE_ADDR pc; | |
3819 | struct unwind_table_entry *u; | |
3820 | unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp; | |
3821 | int status, i, reg; | |
3822 | char buf[4]; | |
3823 | int fp_loc = -1; | |
d4f3574e | 3824 | int final_iteration; |
c906108c SS |
3825 | |
3826 | /* Zero out everything. */ | |
3827 | memset (frame_saved_regs, '\0', sizeof (struct frame_saved_regs)); | |
3828 | ||
3829 | /* Call dummy frames always look the same, so there's no need to | |
3830 | examine the dummy code to determine locations of saved registers; | |
3831 | instead, let find_dummy_frame_regs fill in the correct offsets | |
3832 | for the saved registers. */ | |
3833 | if ((frame_info->pc >= frame_info->frame | |
53a5351d JM |
3834 | && frame_info->pc <= (frame_info->frame |
3835 | /* A call dummy is sized in words, but it is | |
3836 | actually a series of instructions. Account | |
3837 | for that scaling factor. */ | |
3838 | + ((REGISTER_SIZE / INSTRUCTION_SIZE) | |
3839 | * CALL_DUMMY_LENGTH) | |
3840 | /* Similarly we have to account for 64bit | |
3841 | wide register saves. */ | |
3842 | + (32 * REGISTER_SIZE) | |
3843 | /* We always consider FP regs 8 bytes long. */ | |
3844 | + (NUM_REGS - FP0_REGNUM) * 8 | |
3845 | /* Similarly we have to account for 64bit | |
3846 | wide register saves. */ | |
3847 | + (6 * REGISTER_SIZE)))) | |
c906108c SS |
3848 | find_dummy_frame_regs (frame_info, frame_saved_regs); |
3849 | ||
3850 | /* Interrupt handlers are special too. They lay out the register | |
3851 | state in the exact same order as the register numbers in GDB. */ | |
3852 | if (pc_in_interrupt_handler (frame_info->pc)) | |
3853 | { | |
3854 | for (i = 0; i < NUM_REGS; i++) | |
3855 | { | |
3856 | /* SP is a little special. */ | |
3857 | if (i == SP_REGNUM) | |
3858 | frame_saved_regs->regs[SP_REGNUM] | |
53a5351d JM |
3859 | = read_memory_integer (frame_info->frame + SP_REGNUM * 4, |
3860 | TARGET_PTR_BIT / 8); | |
c906108c SS |
3861 | else |
3862 | frame_saved_regs->regs[i] = frame_info->frame + i * 4; | |
3863 | } | |
3864 | return; | |
3865 | } | |
3866 | ||
3867 | #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP | |
3868 | /* Handle signal handler callers. */ | |
3869 | if (frame_info->signal_handler_caller) | |
3870 | { | |
3871 | FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs); | |
3872 | return; | |
3873 | } | |
3874 | #endif | |
3875 | ||
3876 | /* Get the starting address of the function referred to by the PC | |
3877 | saved in frame. */ | |
3878 | pc = get_pc_function_start (frame_info->pc); | |
3879 | ||
3880 | /* Yow! */ | |
3881 | u = find_unwind_entry (pc); | |
3882 | if (!u) | |
3883 | return; | |
3884 | ||
3885 | /* This is how much of a frame adjustment we need to account for. */ | |
3886 | stack_remaining = u->Total_frame_size << 3; | |
3887 | ||
3888 | /* Magic register saves we want to know about. */ | |
3889 | save_rp = u->Save_RP; | |
3890 | save_sp = u->Save_SP; | |
3891 | ||
3892 | /* Turn the Entry_GR field into a bitmask. */ | |
3893 | save_gr = 0; | |
3894 | for (i = 3; i < u->Entry_GR + 3; i++) | |
3895 | { | |
3896 | /* Frame pointer gets saved into a special location. */ | |
3897 | if (u->Save_SP && i == FP_REGNUM) | |
3898 | continue; | |
3899 | ||
3900 | save_gr |= (1 << i); | |
3901 | } | |
3902 | ||
3903 | /* Turn the Entry_FR field into a bitmask too. */ | |
3904 | save_fr = 0; | |
3905 | for (i = 12; i < u->Entry_FR + 12; i++) | |
3906 | save_fr |= (1 << i); | |
3907 | ||
3908 | /* The frame always represents the value of %sp at entry to the | |
3909 | current function (and is thus equivalent to the "saved" stack | |
3910 | pointer. */ | |
3911 | frame_saved_regs->regs[SP_REGNUM] = frame_info->frame; | |
3912 | ||
3913 | /* Loop until we find everything of interest or hit a branch. | |
3914 | ||
3915 | For unoptimized GCC code and for any HP CC code this will never ever | |
3916 | examine any user instructions. | |
3917 | ||
7be570e7 | 3918 | For optimized GCC code we're faced with problems. GCC will schedule |
c906108c SS |
3919 | its prologue and make prologue instructions available for delay slot |
3920 | filling. The end result is user code gets mixed in with the prologue | |
3921 | and a prologue instruction may be in the delay slot of the first branch | |
3922 | or call. | |
3923 | ||
3924 | Some unexpected things are expected with debugging optimized code, so | |
3925 | we allow this routine to walk past user instructions in optimized | |
3926 | GCC code. */ | |
d4f3574e SS |
3927 | final_iteration = 0; |
3928 | while ((save_gr || save_fr || save_rp || save_sp || stack_remaining > 0) | |
3929 | && pc <= frame_info->pc) | |
c906108c SS |
3930 | { |
3931 | status = target_read_memory (pc, buf, 4); | |
3932 | inst = extract_unsigned_integer (buf, 4); | |
3933 | ||
3934 | /* Yow! */ | |
3935 | if (status != 0) | |
3936 | return; | |
3937 | ||
3938 | /* Note the interesting effects of this instruction. */ | |
3939 | stack_remaining -= prologue_inst_adjust_sp (inst); | |
3940 | ||
104c1213 JM |
3941 | /* There are limited ways to store the return pointer into the |
3942 | stack. */ | |
c2c6d25f | 3943 | if (inst == 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */ |
c906108c SS |
3944 | { |
3945 | save_rp = 0; | |
3946 | frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 20; | |
3947 | } | |
c2c6d25f JM |
3948 | else if (inst == 0x0fc212c1) /* std rp,-0x10(sr0,sp) */ |
3949 | { | |
3950 | save_rp = 0; | |
3951 | frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 16; | |
3952 | } | |
c906108c | 3953 | |
104c1213 JM |
3954 | /* Note if we saved SP into the stack. This also happens to indicate |
3955 | the location of the saved frame pointer. */ | |
c2c6d25f JM |
3956 | if ( (inst & 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */ |
3957 | || (inst & 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */ | |
104c1213 JM |
3958 | { |
3959 | frame_saved_regs->regs[FP_REGNUM] = frame_info->frame; | |
3960 | save_sp = 0; | |
3961 | } | |
c906108c SS |
3962 | |
3963 | /* Account for general and floating-point register saves. */ | |
3964 | reg = inst_saves_gr (inst); | |
3965 | if (reg >= 3 && reg <= 18 | |
3966 | && (!u->Save_SP || reg != FP_REGNUM)) | |
3967 | { | |
3968 | save_gr &= ~(1 << reg); | |
3969 | ||
3970 | /* stwm with a positive displacement is a *post modify*. */ | |
3971 | if ((inst >> 26) == 0x1b | |
3972 | && extract_14 (inst) >= 0) | |
3973 | frame_saved_regs->regs[reg] = frame_info->frame; | |
104c1213 JM |
3974 | /* A std has explicit post_modify forms. */ |
3975 | else if ((inst & 0xfc00000c0) == 0x70000008) | |
3976 | frame_saved_regs->regs[reg] = frame_info->frame; | |
c906108c SS |
3977 | else |
3978 | { | |
104c1213 JM |
3979 | CORE_ADDR offset; |
3980 | ||
3981 | if ((inst >> 26) == 0x1c) | |
d4f3574e | 3982 | offset = (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3); |
104c1213 JM |
3983 | else if ((inst >> 26) == 0x03) |
3984 | offset = low_sign_extend (inst & 0x1f, 5); | |
3985 | else | |
3986 | offset = extract_14 (inst); | |
3987 | ||
c906108c SS |
3988 | /* Handle code with and without frame pointers. */ |
3989 | if (u->Save_SP) | |
3990 | frame_saved_regs->regs[reg] | |
104c1213 | 3991 | = frame_info->frame + offset; |
c906108c SS |
3992 | else |
3993 | frame_saved_regs->regs[reg] | |
104c1213 JM |
3994 | = (frame_info->frame + (u->Total_frame_size << 3) |
3995 | + offset); | |
c906108c SS |
3996 | } |
3997 | } | |
3998 | ||
3999 | ||
4000 | /* GCC handles callee saved FP regs a little differently. | |
4001 | ||
c5aa993b JM |
4002 | It emits an instruction to put the value of the start of |
4003 | the FP store area into %r1. It then uses fstds,ma with | |
4004 | a basereg of %r1 for the stores. | |
c906108c | 4005 | |
c5aa993b JM |
4006 | HP CC emits them at the current stack pointer modifying |
4007 | the stack pointer as it stores each register. */ | |
c906108c SS |
4008 | |
4009 | /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */ | |
4010 | if ((inst & 0xffffc000) == 0x34610000 | |
4011 | || (inst & 0xffffc000) == 0x37c10000) | |
4012 | fp_loc = extract_14 (inst); | |
c5aa993b | 4013 | |
c906108c SS |
4014 | reg = inst_saves_fr (inst); |
4015 | if (reg >= 12 && reg <= 21) | |
4016 | { | |
4017 | /* Note +4 braindamage below is necessary because the FP status | |
4018 | registers are internally 8 registers rather than the expected | |
4019 | 4 registers. */ | |
4020 | save_fr &= ~(1 << reg); | |
4021 | if (fp_loc == -1) | |
4022 | { | |
4023 | /* 1st HP CC FP register store. After this instruction | |
c5aa993b JM |
4024 | we've set enough state that the GCC and HPCC code are |
4025 | both handled in the same manner. */ | |
c906108c SS |
4026 | frame_saved_regs->regs[reg + FP4_REGNUM + 4] = frame_info->frame; |
4027 | fp_loc = 8; | |
4028 | } | |
4029 | else | |
4030 | { | |
4031 | frame_saved_regs->regs[reg + FP0_REGNUM + 4] | |
4032 | = frame_info->frame + fp_loc; | |
4033 | fp_loc += 8; | |
4034 | } | |
4035 | } | |
4036 | ||
39f77062 | 4037 | /* Quit if we hit any kind of branch the previous iteration. */ |
d4f3574e | 4038 | if (final_iteration) |
c906108c SS |
4039 | break; |
4040 | ||
d4f3574e SS |
4041 | /* We want to look precisely one instruction beyond the branch |
4042 | if we have not found everything yet. */ | |
4043 | if (is_branch (inst)) | |
4044 | final_iteration = 1; | |
4045 | ||
c906108c SS |
4046 | /* Bump the PC. */ |
4047 | pc += 4; | |
4048 | } | |
4049 | } | |
4050 | ||
4051 | ||
4052 | /* Exception handling support for the HP-UX ANSI C++ compiler. | |
4053 | The compiler (aCC) provides a callback for exception events; | |
4054 | GDB can set a breakpoint on this callback and find out what | |
4055 | exception event has occurred. */ | |
4056 | ||
4057 | /* The name of the hook to be set to point to the callback function */ | |
c5aa993b JM |
4058 | static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; |
4059 | /* The name of the function to be used to set the hook value */ | |
4060 | static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; | |
4061 | /* The name of the callback function in end.o */ | |
c906108c | 4062 | static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; |
c5aa993b JM |
4063 | /* Name of function in end.o on which a break is set (called by above) */ |
4064 | static char HP_ACC_EH_break[] = "__d_eh_break"; | |
4065 | /* Name of flag (in end.o) that enables catching throws */ | |
4066 | static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; | |
4067 | /* Name of flag (in end.o) that enables catching catching */ | |
4068 | static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; | |
4069 | /* The enum used by aCC */ | |
4070 | typedef enum | |
4071 | { | |
4072 | __EH_NOTIFY_THROW, | |
4073 | __EH_NOTIFY_CATCH | |
4074 | } | |
4075 | __eh_notification; | |
c906108c SS |
4076 | |
4077 | /* Is exception-handling support available with this executable? */ | |
4078 | static int hp_cxx_exception_support = 0; | |
4079 | /* Has the initialize function been run? */ | |
4080 | int hp_cxx_exception_support_initialized = 0; | |
4081 | /* Similar to above, but imported from breakpoint.c -- non-target-specific */ | |
4082 | extern int exception_support_initialized; | |
4083 | /* Address of __eh_notify_hook */ | |
a0b3c4fd | 4084 | static CORE_ADDR eh_notify_hook_addr = 0; |
c906108c | 4085 | /* Address of __d_eh_notify_callback */ |
a0b3c4fd | 4086 | static CORE_ADDR eh_notify_callback_addr = 0; |
c906108c | 4087 | /* Address of __d_eh_break */ |
a0b3c4fd | 4088 | static CORE_ADDR eh_break_addr = 0; |
c906108c | 4089 | /* Address of __d_eh_catch_catch */ |
a0b3c4fd | 4090 | static CORE_ADDR eh_catch_catch_addr = 0; |
c906108c | 4091 | /* Address of __d_eh_catch_throw */ |
a0b3c4fd | 4092 | static CORE_ADDR eh_catch_throw_addr = 0; |
c906108c | 4093 | /* Sal for __d_eh_break */ |
a0b3c4fd | 4094 | static struct symtab_and_line *break_callback_sal = 0; |
c906108c SS |
4095 | |
4096 | /* Code in end.c expects __d_pid to be set in the inferior, | |
4097 | otherwise __d_eh_notify_callback doesn't bother to call | |
4098 | __d_eh_break! So we poke the pid into this symbol | |
4099 | ourselves. | |
4100 | 0 => success | |
c5aa993b | 4101 | 1 => failure */ |
c906108c | 4102 | int |
fba45db2 | 4103 | setup_d_pid_in_inferior (void) |
c906108c SS |
4104 | { |
4105 | CORE_ADDR anaddr; | |
c5aa993b JM |
4106 | struct minimal_symbol *msymbol; |
4107 | char buf[4]; /* FIXME 32x64? */ | |
4108 | ||
c906108c SS |
4109 | /* Slam the pid of the process into __d_pid; failing is only a warning! */ |
4110 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
4111 | if (msymbol == NULL) | |
4112 | { | |
4113 | warning ("Unable to find __d_pid symbol in object file."); | |
4114 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
4115 | return 1; | |
4116 | } | |
4117 | ||
4118 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
39f77062 | 4119 | store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */ |
c5aa993b | 4120 | if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ |
c906108c SS |
4121 | { |
4122 | warning ("Unable to write __d_pid"); | |
4123 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
4124 | return 1; | |
4125 | } | |
4126 | return 0; | |
4127 | } | |
4128 | ||
4129 | /* Initialize exception catchpoint support by looking for the | |
4130 | necessary hooks/callbacks in end.o, etc., and set the hook value to | |
4131 | point to the required debug function | |
4132 | ||
4133 | Return 0 => failure | |
c5aa993b | 4134 | 1 => success */ |
c906108c SS |
4135 | |
4136 | static int | |
fba45db2 | 4137 | initialize_hp_cxx_exception_support (void) |
c906108c SS |
4138 | { |
4139 | struct symtabs_and_lines sals; | |
c5aa993b JM |
4140 | struct cleanup *old_chain; |
4141 | struct cleanup *canonical_strings_chain = NULL; | |
c906108c | 4142 | int i; |
c5aa993b JM |
4143 | char *addr_start; |
4144 | char *addr_end = NULL; | |
4145 | char **canonical = (char **) NULL; | |
c906108c | 4146 | int thread = -1; |
c5aa993b JM |
4147 | struct symbol *sym = NULL; |
4148 | struct minimal_symbol *msym = NULL; | |
4149 | struct objfile *objfile; | |
c906108c SS |
4150 | asection *shlib_info; |
4151 | ||
4152 | /* Detect and disallow recursion. On HP-UX with aCC, infinite | |
4153 | recursion is a possibility because finding the hook for exception | |
4154 | callbacks involves making a call in the inferior, which means | |
4155 | re-inserting breakpoints which can re-invoke this code */ | |
4156 | ||
c5aa993b JM |
4157 | static int recurse = 0; |
4158 | if (recurse > 0) | |
c906108c SS |
4159 | { |
4160 | hp_cxx_exception_support_initialized = 0; | |
4161 | exception_support_initialized = 0; | |
4162 | return 0; | |
4163 | } | |
4164 | ||
4165 | hp_cxx_exception_support = 0; | |
4166 | ||
4167 | /* First check if we have seen any HP compiled objects; if not, | |
4168 | it is very unlikely that HP's idiosyncratic callback mechanism | |
4169 | for exception handling debug support will be available! | |
4170 | This will percolate back up to breakpoint.c, where our callers | |
4171 | will decide to try the g++ exception-handling support instead. */ | |
4172 | if (!hp_som_som_object_present) | |
4173 | return 0; | |
c5aa993b | 4174 | |
c906108c SS |
4175 | /* We have a SOM executable with SOM debug info; find the hooks */ |
4176 | ||
4177 | /* First look for the notify hook provided by aCC runtime libs */ | |
4178 | /* If we find this symbol, we conclude that the executable must | |
4179 | have HP aCC exception support built in. If this symbol is not | |
4180 | found, even though we're a HP SOM-SOM file, we may have been | |
4181 | built with some other compiler (not aCC). This results percolates | |
4182 | back up to our callers in breakpoint.c which can decide to | |
4183 | try the g++ style of exception support instead. | |
4184 | If this symbol is found but the other symbols we require are | |
4185 | not found, there is something weird going on, and g++ support | |
4186 | should *not* be tried as an alternative. | |
c5aa993b | 4187 | |
c906108c SS |
4188 | ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. |
4189 | ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ | |
c5aa993b | 4190 | |
c906108c SS |
4191 | /* libCsup has this hook; it'll usually be non-debuggable */ |
4192 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); | |
4193 | if (msym) | |
4194 | { | |
4195 | eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4196 | hp_cxx_exception_support = 1; | |
c5aa993b | 4197 | } |
c906108c SS |
4198 | else |
4199 | { | |
4200 | warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook); | |
4201 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4202 | warning ("GDB will be unable to intercept exception events."); | |
4203 | eh_notify_hook_addr = 0; | |
4204 | hp_cxx_exception_support = 0; | |
4205 | return 0; | |
4206 | } | |
4207 | ||
c906108c | 4208 | /* Next look for the notify callback routine in end.o */ |
c5aa993b | 4209 | /* This is always available in the SOM symbol dictionary if end.o is linked in */ |
c906108c SS |
4210 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); |
4211 | if (msym) | |
4212 | { | |
4213 | eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4214 | hp_cxx_exception_support = 1; | |
c5aa993b JM |
4215 | } |
4216 | else | |
c906108c SS |
4217 | { |
4218 | warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback); | |
4219 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
4220 | warning ("GDB will be unable to intercept exception events."); | |
4221 | eh_notify_callback_addr = 0; | |
4222 | return 0; | |
4223 | } | |
4224 | ||
53a5351d | 4225 | #ifndef GDB_TARGET_IS_HPPA_20W |
c906108c SS |
4226 | /* Check whether the executable is dynamically linked or archive bound */ |
4227 | /* With an archive-bound executable we can use the raw addresses we find | |
4228 | for the callback function, etc. without modification. For an executable | |
4229 | with shared libraries, we have to do more work to find the plabel, which | |
4230 | can be the target of a call through $$dyncall from the aCC runtime support | |
4231 | library (libCsup) which is linked shared by default by aCC. */ | |
4232 | /* This test below was copied from somsolib.c/somread.c. It may not be a very | |
c5aa993b | 4233 | reliable one to test that an executable is linked shared. pai/1997-07-18 */ |
c906108c SS |
4234 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); |
4235 | if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) | |
4236 | { | |
4237 | /* The minsym we have has the local code address, but that's not the | |
4238 | plabel that can be used by an inter-load-module call. */ | |
4239 | /* Find solib handle for main image (which has end.o), and use that | |
4240 | and the min sym as arguments to __d_shl_get() (which does the equivalent | |
c5aa993b | 4241 | of shl_findsym()) to find the plabel. */ |
c906108c SS |
4242 | |
4243 | args_for_find_stub args; | |
4244 | static char message[] = "Error while finding exception callback hook:\n"; | |
c5aa993b | 4245 | |
c906108c SS |
4246 | args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr); |
4247 | args.msym = msym; | |
a0b3c4fd | 4248 | args.return_val = 0; |
c5aa993b | 4249 | |
c906108c | 4250 | recurse++; |
a0b3c4fd JM |
4251 | catch_errors (cover_find_stub_with_shl_get, (PTR) &args, message, |
4252 | RETURN_MASK_ALL); | |
4253 | eh_notify_callback_addr = args.return_val; | |
c906108c | 4254 | recurse--; |
c5aa993b | 4255 | |
c906108c | 4256 | exception_catchpoints_are_fragile = 1; |
c5aa993b | 4257 | |
c906108c | 4258 | if (!eh_notify_callback_addr) |
c5aa993b JM |
4259 | { |
4260 | /* We can get here either if there is no plabel in the export list | |
1faa59a8 | 4261 | for the main image, or if something strange happened (?) */ |
c5aa993b JM |
4262 | warning ("Couldn't find a plabel (indirect function label) for the exception callback."); |
4263 | warning ("GDB will not be able to intercept exception events."); | |
4264 | return 0; | |
4265 | } | |
c906108c SS |
4266 | } |
4267 | else | |
4268 | exception_catchpoints_are_fragile = 0; | |
53a5351d | 4269 | #endif |
c906108c | 4270 | |
c906108c | 4271 | /* Now, look for the breakpointable routine in end.o */ |
c5aa993b | 4272 | /* This should also be available in the SOM symbol dict. if end.o linked in */ |
c906108c SS |
4273 | msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); |
4274 | if (msym) | |
4275 | { | |
4276 | eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4277 | hp_cxx_exception_support = 1; | |
c5aa993b | 4278 | } |
c906108c SS |
4279 | else |
4280 | { | |
4281 | warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break); | |
4282 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4283 | warning ("GDB will be unable to intercept exception events."); | |
4284 | eh_break_addr = 0; | |
4285 | return 0; | |
4286 | } | |
4287 | ||
c906108c SS |
4288 | /* Next look for the catch enable flag provided in end.o */ |
4289 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
c5aa993b JM |
4290 | VAR_NAMESPACE, 0, (struct symtab **) NULL); |
4291 | if (sym) /* sometimes present in debug info */ | |
c906108c SS |
4292 | { |
4293 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); | |
4294 | hp_cxx_exception_support = 1; | |
4295 | } | |
c5aa993b JM |
4296 | else |
4297 | /* otherwise look in SOM symbol dict. */ | |
c906108c SS |
4298 | { |
4299 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); | |
4300 | if (msym) | |
c5aa993b JM |
4301 | { |
4302 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4303 | hp_cxx_exception_support = 1; | |
4304 | } | |
c906108c | 4305 | else |
c5aa993b JM |
4306 | { |
4307 | warning ("Unable to enable interception of exception catches."); | |
4308 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4309 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4310 | return 0; | |
4311 | } | |
c906108c SS |
4312 | } |
4313 | ||
c906108c SS |
4314 | /* Next look for the catch enable flag provided end.o */ |
4315 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
c5aa993b JM |
4316 | VAR_NAMESPACE, 0, (struct symtab **) NULL); |
4317 | if (sym) /* sometimes present in debug info */ | |
c906108c SS |
4318 | { |
4319 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); | |
4320 | hp_cxx_exception_support = 1; | |
4321 | } | |
c5aa993b JM |
4322 | else |
4323 | /* otherwise look in SOM symbol dict. */ | |
c906108c SS |
4324 | { |
4325 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); | |
4326 | if (msym) | |
c5aa993b JM |
4327 | { |
4328 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); | |
4329 | hp_cxx_exception_support = 1; | |
4330 | } | |
c906108c | 4331 | else |
c5aa993b JM |
4332 | { |
4333 | warning ("Unable to enable interception of exception throws."); | |
4334 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
4335 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
4336 | return 0; | |
4337 | } | |
c906108c SS |
4338 | } |
4339 | ||
c5aa993b JM |
4340 | /* Set the flags */ |
4341 | hp_cxx_exception_support = 2; /* everything worked so far */ | |
c906108c SS |
4342 | hp_cxx_exception_support_initialized = 1; |
4343 | exception_support_initialized = 1; | |
4344 | ||
4345 | return 1; | |
4346 | } | |
4347 | ||
4348 | /* Target operation for enabling or disabling interception of | |
4349 | exception events. | |
4350 | KIND is either EX_EVENT_THROW or EX_EVENT_CATCH | |
4351 | ENABLE is either 0 (disable) or 1 (enable). | |
4352 | Return value is NULL if no support found; | |
4353 | -1 if something went wrong, | |
4354 | or a pointer to a symtab/line struct if the breakpointable | |
c5aa993b | 4355 | address was found. */ |
c906108c | 4356 | |
c5aa993b | 4357 | struct symtab_and_line * |
fba45db2 | 4358 | child_enable_exception_callback (enum exception_event_kind kind, int enable) |
c906108c SS |
4359 | { |
4360 | char buf[4]; | |
4361 | ||
4362 | if (!exception_support_initialized || !hp_cxx_exception_support_initialized) | |
4363 | if (!initialize_hp_cxx_exception_support ()) | |
4364 | return NULL; | |
4365 | ||
4366 | switch (hp_cxx_exception_support) | |
4367 | { | |
c5aa993b JM |
4368 | case 0: |
4369 | /* Assuming no HP support at all */ | |
4370 | return NULL; | |
4371 | case 1: | |
4372 | /* HP support should be present, but something went wrong */ | |
4373 | return (struct symtab_and_line *) -1; /* yuck! */ | |
4374 | /* there may be other cases in the future */ | |
c906108c | 4375 | } |
c5aa993b | 4376 | |
c906108c | 4377 | /* Set the EH hook to point to the callback routine */ |
c5aa993b | 4378 | store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ |
c906108c | 4379 | /* pai: (temp) FIXME should there be a pack operation first? */ |
c5aa993b | 4380 | if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ |
c906108c SS |
4381 | { |
4382 | warning ("Could not write to target memory for exception event callback."); | |
4383 | warning ("Interception of exception events may not work."); | |
c5aa993b | 4384 | return (struct symtab_and_line *) -1; |
c906108c SS |
4385 | } |
4386 | if (enable) | |
4387 | { | |
c5aa993b | 4388 | /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */ |
39f77062 | 4389 | if (PIDGET (inferior_ptid) > 0) |
c5aa993b JM |
4390 | { |
4391 | if (setup_d_pid_in_inferior ()) | |
4392 | return (struct symtab_and_line *) -1; | |
4393 | } | |
c906108c | 4394 | else |
c5aa993b | 4395 | { |
104c1213 JM |
4396 | warning ("Internal error: Invalid inferior pid? Cannot intercept exception events."); |
4397 | return (struct symtab_and_line *) -1; | |
c5aa993b | 4398 | } |
c906108c | 4399 | } |
c5aa993b | 4400 | |
c906108c SS |
4401 | switch (kind) |
4402 | { | |
c5aa993b JM |
4403 | case EX_EVENT_THROW: |
4404 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
4405 | if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ | |
4406 | { | |
4407 | warning ("Couldn't enable exception throw interception."); | |
4408 | return (struct symtab_and_line *) -1; | |
4409 | } | |
4410 | break; | |
4411 | case EX_EVENT_CATCH: | |
4412 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
4413 | if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ | |
4414 | { | |
4415 | warning ("Couldn't enable exception catch interception."); | |
4416 | return (struct symtab_and_line *) -1; | |
4417 | } | |
4418 | break; | |
104c1213 JM |
4419 | default: |
4420 | error ("Request to enable unknown or unsupported exception event."); | |
c906108c | 4421 | } |
c5aa993b | 4422 | |
c906108c SS |
4423 | /* Copy break address into new sal struct, malloc'ing if needed. */ |
4424 | if (!break_callback_sal) | |
4425 | { | |
4426 | break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); | |
4427 | } | |
c5aa993b | 4428 | INIT_SAL (break_callback_sal); |
c906108c SS |
4429 | break_callback_sal->symtab = NULL; |
4430 | break_callback_sal->pc = eh_break_addr; | |
4431 | break_callback_sal->line = 0; | |
4432 | break_callback_sal->end = eh_break_addr; | |
c5aa993b | 4433 | |
c906108c SS |
4434 | return break_callback_sal; |
4435 | } | |
4436 | ||
c5aa993b | 4437 | /* Record some information about the current exception event */ |
c906108c | 4438 | static struct exception_event_record current_ex_event; |
c5aa993b JM |
4439 | /* Convenience struct */ |
4440 | static struct symtab_and_line null_symtab_and_line = | |
4441 | {NULL, 0, 0, 0}; | |
c906108c SS |
4442 | |
4443 | /* Report current exception event. Returns a pointer to a record | |
4444 | that describes the kind of the event, where it was thrown from, | |
4445 | and where it will be caught. More information may be reported | |
c5aa993b | 4446 | in the future */ |
c906108c | 4447 | struct exception_event_record * |
fba45db2 | 4448 | child_get_current_exception_event (void) |
c906108c | 4449 | { |
c5aa993b JM |
4450 | CORE_ADDR event_kind; |
4451 | CORE_ADDR throw_addr; | |
4452 | CORE_ADDR catch_addr; | |
c906108c SS |
4453 | struct frame_info *fi, *curr_frame; |
4454 | int level = 1; | |
4455 | ||
c5aa993b | 4456 | curr_frame = get_current_frame (); |
c906108c SS |
4457 | if (!curr_frame) |
4458 | return (struct exception_event_record *) NULL; | |
4459 | ||
4460 | /* Go up one frame to __d_eh_notify_callback, because at the | |
4461 | point when this code is executed, there's garbage in the | |
4462 | arguments of __d_eh_break. */ | |
4463 | fi = find_relative_frame (curr_frame, &level); | |
4464 | if (level != 0) | |
4465 | return (struct exception_event_record *) NULL; | |
4466 | ||
4467 | select_frame (fi, -1); | |
4468 | ||
4469 | /* Read in the arguments */ | |
4470 | /* __d_eh_notify_callback() is called with 3 arguments: | |
c5aa993b JM |
4471 | 1. event kind catch or throw |
4472 | 2. the target address if known | |
4473 | 3. a flag -- not sure what this is. pai/1997-07-17 */ | |
4474 | event_kind = read_register (ARG0_REGNUM); | |
c906108c SS |
4475 | catch_addr = read_register (ARG1_REGNUM); |
4476 | ||
4477 | /* Now go down to a user frame */ | |
4478 | /* For a throw, __d_eh_break is called by | |
c5aa993b JM |
4479 | __d_eh_notify_callback which is called by |
4480 | __notify_throw which is called | |
4481 | from user code. | |
c906108c | 4482 | For a catch, __d_eh_break is called by |
c5aa993b JM |
4483 | __d_eh_notify_callback which is called by |
4484 | <stackwalking stuff> which is called by | |
4485 | __throw__<stuff> or __rethrow_<stuff> which is called | |
4486 | from user code. */ | |
4487 | /* FIXME: Don't use such magic numbers; search for the frames */ | |
c906108c SS |
4488 | level = (event_kind == EX_EVENT_THROW) ? 3 : 4; |
4489 | fi = find_relative_frame (curr_frame, &level); | |
4490 | if (level != 0) | |
4491 | return (struct exception_event_record *) NULL; | |
4492 | ||
4493 | select_frame (fi, -1); | |
4494 | throw_addr = fi->pc; | |
4495 | ||
4496 | /* Go back to original (top) frame */ | |
4497 | select_frame (curr_frame, -1); | |
4498 | ||
4499 | current_ex_event.kind = (enum exception_event_kind) event_kind; | |
4500 | current_ex_event.throw_sal = find_pc_line (throw_addr, 1); | |
4501 | current_ex_event.catch_sal = find_pc_line (catch_addr, 1); | |
4502 | ||
4503 | return ¤t_ex_event; | |
4504 | } | |
4505 | ||
c906108c | 4506 | static void |
fba45db2 | 4507 | unwind_command (char *exp, int from_tty) |
c906108c SS |
4508 | { |
4509 | CORE_ADDR address; | |
4510 | struct unwind_table_entry *u; | |
4511 | ||
4512 | /* If we have an expression, evaluate it and use it as the address. */ | |
4513 | ||
4514 | if (exp != 0 && *exp != 0) | |
4515 | address = parse_and_eval_address (exp); | |
4516 | else | |
4517 | return; | |
4518 | ||
4519 | u = find_unwind_entry (address); | |
4520 | ||
4521 | if (!u) | |
4522 | { | |
4523 | printf_unfiltered ("Can't find unwind table entry for %s\n", exp); | |
4524 | return; | |
4525 | } | |
4526 | ||
ce414844 AC |
4527 | printf_unfiltered ("unwind_table_entry (0x%s):\n", |
4528 | paddr_nz (host_pointer_to_address (u))); | |
c906108c SS |
4529 | |
4530 | printf_unfiltered ("\tregion_start = "); | |
4531 | print_address (u->region_start, gdb_stdout); | |
4532 | ||
4533 | printf_unfiltered ("\n\tregion_end = "); | |
4534 | print_address (u->region_end, gdb_stdout); | |
4535 | ||
c906108c | 4536 | #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD); |
c906108c SS |
4537 | |
4538 | printf_unfiltered ("\n\tflags ="); | |
4539 | pif (Cannot_unwind); | |
4540 | pif (Millicode); | |
4541 | pif (Millicode_save_sr0); | |
4542 | pif (Entry_SR); | |
4543 | pif (Args_stored); | |
4544 | pif (Variable_Frame); | |
4545 | pif (Separate_Package_Body); | |
4546 | pif (Frame_Extension_Millicode); | |
4547 | pif (Stack_Overflow_Check); | |
4548 | pif (Two_Instruction_SP_Increment); | |
4549 | pif (Ada_Region); | |
4550 | pif (Save_SP); | |
4551 | pif (Save_RP); | |
4552 | pif (Save_MRP_in_frame); | |
4553 | pif (extn_ptr_defined); | |
4554 | pif (Cleanup_defined); | |
4555 | pif (MPE_XL_interrupt_marker); | |
4556 | pif (HP_UX_interrupt_marker); | |
4557 | pif (Large_frame); | |
4558 | ||
4559 | putchar_unfiltered ('\n'); | |
4560 | ||
c906108c | 4561 | #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD); |
c906108c SS |
4562 | |
4563 | pin (Region_description); | |
4564 | pin (Entry_FR); | |
4565 | pin (Entry_GR); | |
4566 | pin (Total_frame_size); | |
4567 | } | |
c906108c SS |
4568 | |
4569 | #ifdef PREPARE_TO_PROCEED | |
4570 | ||
4571 | /* If the user has switched threads, and there is a breakpoint | |
4572 | at the old thread's pc location, then switch to that thread | |
4573 | and return TRUE, else return FALSE and don't do a thread | |
4574 | switch (or rather, don't seem to have done a thread switch). | |
4575 | ||
4576 | Ptrace-based gdb will always return FALSE to the thread-switch | |
4577 | query, and thus also to PREPARE_TO_PROCEED. | |
4578 | ||
4579 | The important thing is whether there is a BPT instruction, | |
4580 | not how many user breakpoints there are. So we have to worry | |
4581 | about things like these: | |
4582 | ||
4583 | o Non-bp stop -- NO | |
4584 | ||
4585 | o User hits bp, no switch -- NO | |
4586 | ||
4587 | o User hits bp, switches threads -- YES | |
4588 | ||
4589 | o User hits bp, deletes bp, switches threads -- NO | |
4590 | ||
4591 | o User hits bp, deletes one of two or more bps | |
c5aa993b | 4592 | at that PC, user switches threads -- YES |
c906108c SS |
4593 | |
4594 | o Plus, since we're buffering events, the user may have hit a | |
c5aa993b JM |
4595 | breakpoint, deleted the breakpoint and then gotten another |
4596 | hit on that same breakpoint on another thread which | |
4597 | actually hit before the delete. (FIXME in breakpoint.c | |
4598 | so that "dead" breakpoints are ignored?) -- NO | |
c906108c SS |
4599 | |
4600 | For these reasons, we have to violate information hiding and | |
4601 | call "breakpoint_here_p". If core gdb thinks there is a bpt | |
4602 | here, that's what counts, as core gdb is the one which is | |
e02bc4cc DS |
4603 | putting the BPT instruction in and taking it out. |
4604 | ||
4605 | Note that this implementation is potentially redundant now that | |
8849f47d JL |
4606 | default_prepare_to_proceed() has been added. |
4607 | ||
4608 | FIXME This may not support switching threads after Ctrl-C | |
4609 | correctly. The default implementation does support this. */ | |
c906108c | 4610 | int |
fba45db2 | 4611 | hppa_prepare_to_proceed (void) |
c906108c SS |
4612 | { |
4613 | pid_t old_thread; | |
4614 | pid_t current_thread; | |
4615 | ||
39f77062 | 4616 | old_thread = hppa_switched_threads (PIDGET (inferior_ptid)); |
c906108c SS |
4617 | if (old_thread != 0) |
4618 | { | |
4619 | /* Switched over from "old_thread". Try to do | |
4620 | as little work as possible, 'cause mostly | |
4621 | we're going to switch back. */ | |
4622 | CORE_ADDR new_pc; | |
c5aa993b | 4623 | CORE_ADDR old_pc = read_pc (); |
c906108c SS |
4624 | |
4625 | /* Yuk, shouldn't use global to specify current | |
4626 | thread. But that's how gdb does it. */ | |
39f77062 KB |
4627 | current_thread = PIDGET (inferior_ptid); |
4628 | inferior_ptid = pid_to_ptid (old_thread); | |
c906108c | 4629 | |
c5aa993b JM |
4630 | new_pc = read_pc (); |
4631 | if (new_pc != old_pc /* If at same pc, no need */ | |
c906108c | 4632 | && breakpoint_here_p (new_pc)) |
c5aa993b | 4633 | { |
c906108c | 4634 | /* User hasn't deleted the BP. |
c5aa993b | 4635 | Return TRUE, finishing switch to "old_thread". */ |
c906108c SS |
4636 | flush_cached_frames (); |
4637 | registers_changed (); | |
4638 | #if 0 | |
c5aa993b | 4639 | printf ("---> PREPARE_TO_PROCEED (was %d, now %d)!\n", |
39f77062 | 4640 | current_thread, PIDGET (inferior_ptid)); |
c906108c | 4641 | #endif |
c5aa993b | 4642 | |
c906108c | 4643 | return 1; |
c5aa993b | 4644 | } |
c906108c SS |
4645 | |
4646 | /* Otherwise switch back to the user-chosen thread. */ | |
39f77062 | 4647 | inferior_ptid = pid_to_ptid (current_thread); |
c5aa993b | 4648 | new_pc = read_pc (); /* Re-prime register cache */ |
c906108c SS |
4649 | } |
4650 | ||
4651 | return 0; | |
4652 | } | |
4653 | #endif /* PREPARE_TO_PROCEED */ | |
4654 | ||
c2c6d25f | 4655 | void |
fba45db2 | 4656 | hppa_skip_permanent_breakpoint (void) |
c2c6d25f JM |
4657 | { |
4658 | /* To step over a breakpoint instruction on the PA takes some | |
4659 | fiddling with the instruction address queue. | |
4660 | ||
4661 | When we stop at a breakpoint, the IA queue front (the instruction | |
4662 | we're executing now) points at the breakpoint instruction, and | |
4663 | the IA queue back (the next instruction to execute) points to | |
4664 | whatever instruction we would execute after the breakpoint, if it | |
4665 | were an ordinary instruction. This is the case even if the | |
4666 | breakpoint is in the delay slot of a branch instruction. | |
4667 | ||
4668 | Clearly, to step past the breakpoint, we need to set the queue | |
4669 | front to the back. But what do we put in the back? What | |
4670 | instruction comes after that one? Because of the branch delay | |
4671 | slot, the next insn is always at the back + 4. */ | |
4672 | write_register (PCOQ_HEAD_REGNUM, read_register (PCOQ_TAIL_REGNUM)); | |
4673 | write_register (PCSQ_HEAD_REGNUM, read_register (PCSQ_TAIL_REGNUM)); | |
4674 | ||
4675 | write_register (PCOQ_TAIL_REGNUM, read_register (PCOQ_TAIL_REGNUM) + 4); | |
4676 | /* We can leave the tail's space the same, since there's no jump. */ | |
4677 | } | |
4678 | ||
c906108c | 4679 | void |
fba45db2 | 4680 | _initialize_hppa_tdep (void) |
c906108c | 4681 | { |
502fd408 MS |
4682 | struct cmd_list_element *c; |
4683 | void break_at_finish_command (char *arg, int from_tty); | |
4684 | void tbreak_at_finish_command (char *arg, int from_tty); | |
4685 | void break_at_finish_at_depth_command (char *arg, int from_tty); | |
4686 | ||
c906108c SS |
4687 | tm_print_insn = print_insn_hppa; |
4688 | ||
c906108c SS |
4689 | add_cmd ("unwind", class_maintenance, unwind_command, |
4690 | "Print unwind table entry at given address.", | |
4691 | &maintenanceprintlist); | |
502fd408 | 4692 | |
799f9e91 MS |
4693 | deprecate_cmd (add_com ("xbreak", class_breakpoint, |
4694 | break_at_finish_command, | |
4695 | concat ("Set breakpoint at procedure exit. \n\ | |
502fd408 MS |
4696 | Argument may be function name, or \"*\" and an address.\n\ |
4697 | If function is specified, break at end of code for that function.\n\ | |
4698 | If an address is specified, break at the end of the function that contains \n\ | |
4699 | that exact address.\n", | |
4700 | "With no arg, uses current execution address of selected stack frame.\n\ | |
4701 | This is useful for breaking on return to a stack frame.\n\ | |
4702 | \n\ | |
4703 | Multiple breakpoints at one place are permitted, and useful if conditional.\n\ | |
4704 | \n\ | |
799f9e91 MS |
4705 | Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL)), NULL); |
4706 | deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint, 1), NULL); | |
4707 | deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint, 1), NULL); | |
4708 | deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint, 1), NULL); | |
4709 | deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint, 1), NULL); | |
4710 | ||
4711 | deprecate_cmd (c = add_com ("txbreak", class_breakpoint, | |
4712 | tbreak_at_finish_command, | |
4713 | "Set temporary breakpoint at procedure exit. Either there should\n\ | |
4714 | be no argument or the argument must be a depth.\n"), NULL); | |
5ba2abeb | 4715 | set_cmd_completer (c, location_completer); |
799f9e91 | 4716 | |
502fd408 | 4717 | if (xdb_commands) |
799f9e91 MS |
4718 | deprecate_cmd (add_com ("bx", class_breakpoint, |
4719 | break_at_finish_at_depth_command, | |
4720 | "Set breakpoint at procedure exit. Either there should\n\ | |
4721 | be no argument or the argument must be a depth.\n"), NULL); | |
c906108c | 4722 | } |
1cdb71fe JL |
4723 | |
4724 | /* Copy the function value from VALBUF into the proper location | |
4725 | for a function return. | |
4726 | ||
4727 | Called only in the context of the "return" command. */ | |
4728 | ||
4729 | void | |
4730 | hppa_store_return_value (struct type *type, char *valbuf) | |
4731 | { | |
4732 | /* For software floating point, the return value goes into the | |
4733 | integer registers. But we do not have any flag to key this on, | |
4734 | so we always store the value into the integer registers. | |
4735 | ||
4736 | If its a float value, then we also store it into the floating | |
4737 | point registers. */ | |
4738 | write_register_bytes (REGISTER_BYTE (28) | |
4739 | + (TYPE_LENGTH (type) > 4 | |
4740 | ? (8 - TYPE_LENGTH (type)) | |
4741 | : (4 - TYPE_LENGTH (type))), | |
4742 | valbuf, | |
4743 | TYPE_LENGTH (type)); | |
4744 | if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT) | |
4745 | write_register_bytes (REGISTER_BYTE (FP4_REGNUM), | |
4746 | valbuf, | |
4747 | TYPE_LENGTH (type)); | |
4748 | } | |
4749 | ||
4750 | /* Copy the function's return value into VALBUF. | |
4751 | ||
4752 | This function is called only in the context of "target function calls", | |
4753 | ie. when the debugger forces a function to be called in the child, and | |
4754 | when the debugger forces a fucntion to return prematurely via the | |
4755 | "return" command. */ | |
4756 | ||
4757 | void | |
4758 | hppa_extract_return_value (struct type *type, char *regbuf, char *valbuf) | |
4759 | { | |
4760 | if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT) | |
4761 | memcpy (valbuf, | |
4762 | (char *)regbuf + REGISTER_BYTE (FP4_REGNUM), | |
4763 | TYPE_LENGTH (type)); | |
4764 | else | |
4765 | memcpy (valbuf, | |
4766 | ((char *)regbuf | |
4767 | + REGISTER_BYTE (28) | |
4768 | + (TYPE_LENGTH (type) > 4 | |
4769 | ? (8 - TYPE_LENGTH (type)) | |
4770 | : (4 - TYPE_LENGTH (type)))), | |
4771 | TYPE_LENGTH (type)); | |
4772 | } |