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273f8429 | 1 | /* Target-dependent code for HPUX running on PA-RISC, for GDB. |
ef6e7e13 AC |
2 | |
3 | Copyright 2002, 2003 Free Software Foundation, Inc. | |
273f8429 JB |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "arch-utils.h" | |
60e1ff27 | 23 | #include "gdbcore.h" |
273f8429 | 24 | #include "osabi.h" |
65e82032 | 25 | #include "gdb_string.h" |
222e5d1d | 26 | #include "frame.h" |
43613416 RC |
27 | #include "frame-unwind.h" |
28 | #include "trad-frame.h" | |
4c02c60c AC |
29 | #include "symtab.h" |
30 | #include "objfiles.h" | |
31 | #include "inferior.h" | |
32 | #include "infcall.h" | |
fdd72f95 | 33 | #include "hppa-tdep.h" |
4c02c60c AC |
34 | |
35 | #include <dl.h> | |
36 | #include <machine/save_state.h> | |
273f8429 | 37 | |
43613416 RC |
38 | #ifndef offsetof |
39 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
40 | #endif | |
41 | ||
273f8429 JB |
42 | /* Forward declarations. */ |
43 | extern void _initialize_hppa_hpux_tdep (void); | |
44 | extern initialize_file_ftype _initialize_hppa_hpux_tdep; | |
45 | ||
4c02c60c AC |
46 | typedef struct |
47 | { | |
48 | struct minimal_symbol *msym; | |
49 | CORE_ADDR solib_handle; | |
50 | CORE_ADDR return_val; | |
51 | } | |
52 | args_for_find_stub; | |
53 | ||
abc485a1 RC |
54 | /* Return one if PC is in the call path of a trampoline, else return zero. |
55 | ||
56 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
57 | just shared library trampolines (import, export). */ | |
58 | ||
59 | static int | |
60 | hppa32_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
61 | { | |
62 | struct minimal_symbol *minsym; | |
63 | struct unwind_table_entry *u; | |
64 | static CORE_ADDR dyncall = 0; | |
65 | static CORE_ADDR sr4export = 0; | |
66 | ||
67 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a | |
68 | new exec file */ | |
69 | ||
70 | /* First see if PC is in one of the two C-library trampolines. */ | |
71 | if (!dyncall) | |
72 | { | |
73 | minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
74 | if (minsym) | |
75 | dyncall = SYMBOL_VALUE_ADDRESS (minsym); | |
76 | else | |
77 | dyncall = -1; | |
78 | } | |
79 | ||
80 | if (!sr4export) | |
81 | { | |
82 | minsym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
83 | if (minsym) | |
84 | sr4export = SYMBOL_VALUE_ADDRESS (minsym); | |
85 | else | |
86 | sr4export = -1; | |
87 | } | |
88 | ||
89 | if (pc == dyncall || pc == sr4export) | |
90 | return 1; | |
91 | ||
92 | minsym = lookup_minimal_symbol_by_pc (pc); | |
93 | if (minsym && strcmp (DEPRECATED_SYMBOL_NAME (minsym), ".stub") == 0) | |
94 | return 1; | |
95 | ||
96 | /* Get the unwind descriptor corresponding to PC, return zero | |
97 | if no unwind was found. */ | |
98 | u = find_unwind_entry (pc); | |
99 | if (!u) | |
100 | return 0; | |
101 | ||
102 | /* If this isn't a linker stub, then return now. */ | |
103 | if (u->stub_unwind.stub_type == 0) | |
104 | return 0; | |
105 | ||
106 | /* By definition a long-branch stub is a call stub. */ | |
107 | if (u->stub_unwind.stub_type == LONG_BRANCH) | |
108 | return 1; | |
109 | ||
110 | /* The call and return path execute the same instructions within | |
111 | an IMPORT stub! So an IMPORT stub is both a call and return | |
112 | trampoline. */ | |
113 | if (u->stub_unwind.stub_type == IMPORT) | |
114 | return 1; | |
115 | ||
116 | /* Parameter relocation stubs always have a call path and may have a | |
117 | return path. */ | |
118 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
119 | || u->stub_unwind.stub_type == EXPORT) | |
120 | { | |
121 | CORE_ADDR addr; | |
122 | ||
123 | /* Search forward from the current PC until we hit a branch | |
124 | or the end of the stub. */ | |
125 | for (addr = pc; addr <= u->region_end; addr += 4) | |
126 | { | |
127 | unsigned long insn; | |
128 | ||
129 | insn = read_memory_integer (addr, 4); | |
130 | ||
131 | /* Does it look like a bl? If so then it's the call path, if | |
132 | we find a bv or be first, then we're on the return path. */ | |
133 | if ((insn & 0xfc00e000) == 0xe8000000) | |
134 | return 1; | |
135 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
136 | || (insn & 0xfc000000) == 0xe0000000) | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* Should never happen. */ | |
141 | warning ("Unable to find branch in parameter relocation stub.\n"); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | /* Unknown stub type. For now, just return zero. */ | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static int | |
150 | hppa64_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
151 | { | |
152 | /* PA64 has a completely different stub/trampoline scheme. Is it | |
153 | better? Maybe. It's certainly harder to determine with any | |
154 | certainty that we are in a stub because we can not refer to the | |
155 | unwinders to help. | |
156 | ||
157 | The heuristic is simple. Try to lookup the current PC value in th | |
158 | minimal symbol table. If that fails, then assume we are not in a | |
159 | stub and return. | |
160 | ||
161 | Then see if the PC value falls within the section bounds for the | |
162 | section containing the minimal symbol we found in the first | |
163 | step. If it does, then assume we are not in a stub and return. | |
164 | ||
165 | Finally peek at the instructions to see if they look like a stub. */ | |
166 | struct minimal_symbol *minsym; | |
167 | asection *sec; | |
168 | CORE_ADDR addr; | |
169 | int insn, i; | |
170 | ||
171 | minsym = lookup_minimal_symbol_by_pc (pc); | |
172 | if (! minsym) | |
173 | return 0; | |
174 | ||
175 | sec = SYMBOL_BFD_SECTION (minsym); | |
176 | ||
177 | if (bfd_get_section_vma (sec->owner, sec) <= pc | |
178 | && pc < (bfd_get_section_vma (sec->owner, sec) | |
179 | + bfd_section_size (sec->owner, sec))) | |
180 | return 0; | |
181 | ||
182 | /* We might be in a stub. Peek at the instructions. Stubs are 3 | |
183 | instructions long. */ | |
184 | insn = read_memory_integer (pc, 4); | |
185 | ||
186 | /* Find out where we think we are within the stub. */ | |
187 | if ((insn & 0xffffc00e) == 0x53610000) | |
188 | addr = pc; | |
189 | else if ((insn & 0xffffffff) == 0xe820d000) | |
190 | addr = pc - 4; | |
191 | else if ((insn & 0xffffc00e) == 0x537b0000) | |
192 | addr = pc - 8; | |
193 | else | |
194 | return 0; | |
195 | ||
196 | /* Now verify each insn in the range looks like a stub instruction. */ | |
197 | insn = read_memory_integer (addr, 4); | |
198 | if ((insn & 0xffffc00e) != 0x53610000) | |
199 | return 0; | |
200 | ||
201 | /* Now verify each insn in the range looks like a stub instruction. */ | |
202 | insn = read_memory_integer (addr + 4, 4); | |
203 | if ((insn & 0xffffffff) != 0xe820d000) | |
204 | return 0; | |
205 | ||
206 | /* Now verify each insn in the range looks like a stub instruction. */ | |
207 | insn = read_memory_integer (addr + 8, 4); | |
208 | if ((insn & 0xffffc00e) != 0x537b0000) | |
209 | return 0; | |
210 | ||
211 | /* Looks like a stub. */ | |
212 | return 1; | |
213 | } | |
214 | ||
215 | /* Return one if PC is in the return path of a trampoline, else return zero. | |
216 | ||
217 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
218 | just shared library trampolines (import, export). */ | |
219 | ||
220 | static int | |
221 | hppa_hpux_in_solib_return_trampoline (CORE_ADDR pc, char *name) | |
222 | { | |
223 | struct unwind_table_entry *u; | |
224 | ||
225 | /* Get the unwind descriptor corresponding to PC, return zero | |
226 | if no unwind was found. */ | |
227 | u = find_unwind_entry (pc); | |
228 | if (!u) | |
229 | return 0; | |
230 | ||
231 | /* If this isn't a linker stub or it's just a long branch stub, then | |
232 | return zero. */ | |
233 | if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) | |
234 | return 0; | |
235 | ||
236 | /* The call and return path execute the same instructions within | |
237 | an IMPORT stub! So an IMPORT stub is both a call and return | |
238 | trampoline. */ | |
239 | if (u->stub_unwind.stub_type == IMPORT) | |
240 | return 1; | |
241 | ||
242 | /* Parameter relocation stubs always have a call path and may have a | |
243 | return path. */ | |
244 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
245 | || u->stub_unwind.stub_type == EXPORT) | |
246 | { | |
247 | CORE_ADDR addr; | |
248 | ||
249 | /* Search forward from the current PC until we hit a branch | |
250 | or the end of the stub. */ | |
251 | for (addr = pc; addr <= u->region_end; addr += 4) | |
252 | { | |
253 | unsigned long insn; | |
254 | ||
255 | insn = read_memory_integer (addr, 4); | |
256 | ||
257 | /* Does it look like a bl? If so then it's the call path, if | |
258 | we find a bv or be first, then we're on the return path. */ | |
259 | if ((insn & 0xfc00e000) == 0xe8000000) | |
260 | return 0; | |
261 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
262 | || (insn & 0xfc000000) == 0xe0000000) | |
263 | return 1; | |
264 | } | |
265 | ||
266 | /* Should never happen. */ | |
267 | warning ("Unable to find branch in parameter relocation stub.\n"); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | /* Unknown stub type. For now, just return zero. */ | |
272 | return 0; | |
273 | ||
274 | } | |
275 | ||
276 | /* Figure out if PC is in a trampoline, and if so find out where | |
277 | the trampoline will jump to. If not in a trampoline, return zero. | |
278 | ||
279 | Simple code examination probably is not a good idea since the code | |
280 | sequences in trampolines can also appear in user code. | |
281 | ||
282 | We use unwinds and information from the minimal symbol table to | |
283 | determine when we're in a trampoline. This won't work for ELF | |
284 | (yet) since it doesn't create stub unwind entries. Whether or | |
285 | not ELF will create stub unwinds or normal unwinds for linker | |
286 | stubs is still being debated. | |
287 | ||
288 | This should handle simple calls through dyncall or sr4export, | |
289 | long calls, argument relocation stubs, and dyncall/sr4export | |
290 | calling an argument relocation stub. It even handles some stubs | |
291 | used in dynamic executables. */ | |
292 | ||
293 | static CORE_ADDR | |
294 | hppa_hpux_skip_trampoline_code (CORE_ADDR pc) | |
295 | { | |
296 | long orig_pc = pc; | |
297 | long prev_inst, curr_inst, loc; | |
298 | static CORE_ADDR dyncall = 0; | |
299 | static CORE_ADDR dyncall_external = 0; | |
300 | static CORE_ADDR sr4export = 0; | |
301 | struct minimal_symbol *msym; | |
302 | struct unwind_table_entry *u; | |
303 | ||
304 | /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a | |
305 | new exec file */ | |
306 | ||
307 | if (!dyncall) | |
308 | { | |
309 | msym = lookup_minimal_symbol ("$$dyncall", NULL, NULL); | |
310 | if (msym) | |
311 | dyncall = SYMBOL_VALUE_ADDRESS (msym); | |
312 | else | |
313 | dyncall = -1; | |
314 | } | |
315 | ||
316 | if (!dyncall_external) | |
317 | { | |
318 | msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL); | |
319 | if (msym) | |
320 | dyncall_external = SYMBOL_VALUE_ADDRESS (msym); | |
321 | else | |
322 | dyncall_external = -1; | |
323 | } | |
324 | ||
325 | if (!sr4export) | |
326 | { | |
327 | msym = lookup_minimal_symbol ("_sr4export", NULL, NULL); | |
328 | if (msym) | |
329 | sr4export = SYMBOL_VALUE_ADDRESS (msym); | |
330 | else | |
331 | sr4export = -1; | |
332 | } | |
333 | ||
334 | /* Addresses passed to dyncall may *NOT* be the actual address | |
335 | of the function. So we may have to do something special. */ | |
336 | if (pc == dyncall) | |
337 | { | |
338 | pc = (CORE_ADDR) read_register (22); | |
339 | ||
340 | /* If bit 30 (counting from the left) is on, then pc is the address of | |
341 | the PLT entry for this function, not the address of the function | |
342 | itself. Bit 31 has meaning too, but only for MPE. */ | |
343 | if (pc & 0x2) | |
344 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); | |
345 | } | |
346 | if (pc == dyncall_external) | |
347 | { | |
348 | pc = (CORE_ADDR) read_register (22); | |
349 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); | |
350 | } | |
351 | else if (pc == sr4export) | |
352 | pc = (CORE_ADDR) (read_register (22)); | |
353 | ||
354 | /* Get the unwind descriptor corresponding to PC, return zero | |
355 | if no unwind was found. */ | |
356 | u = find_unwind_entry (pc); | |
357 | if (!u) | |
358 | return 0; | |
359 | ||
360 | /* If this isn't a linker stub, then return now. */ | |
361 | /* elz: attention here! (FIXME) because of a compiler/linker | |
362 | error, some stubs which should have a non zero stub_unwind.stub_type | |
363 | have unfortunately a value of zero. So this function would return here | |
364 | as if we were not in a trampoline. To fix this, we go look at the partial | |
365 | symbol information, which reports this guy as a stub. | |
366 | (FIXME): Unfortunately, we are not that lucky: it turns out that the | |
367 | partial symbol information is also wrong sometimes. This is because | |
368 | when it is entered (somread.c::som_symtab_read()) it can happen that | |
369 | if the type of the symbol (from the som) is Entry, and the symbol is | |
370 | in a shared library, then it can also be a trampoline. This would | |
371 | be OK, except that I believe the way they decide if we are ina shared library | |
372 | does not work. SOOOO..., even if we have a regular function w/o trampolines | |
373 | its minimal symbol can be assigned type mst_solib_trampoline. | |
374 | Also, if we find that the symbol is a real stub, then we fix the unwind | |
375 | descriptor, and define the stub type to be EXPORT. | |
376 | Hopefully this is correct most of the times. */ | |
377 | if (u->stub_unwind.stub_type == 0) | |
378 | { | |
379 | ||
380 | /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed | |
381 | we can delete all the code which appears between the lines */ | |
382 | /*--------------------------------------------------------------------------*/ | |
383 | msym = lookup_minimal_symbol_by_pc (pc); | |
384 | ||
385 | if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) | |
386 | return orig_pc == pc ? 0 : pc & ~0x3; | |
387 | ||
388 | else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) | |
389 | { | |
390 | struct objfile *objfile; | |
391 | struct minimal_symbol *msymbol; | |
392 | int function_found = 0; | |
393 | ||
394 | /* go look if there is another minimal symbol with the same name as | |
395 | this one, but with type mst_text. This would happen if the msym | |
396 | is an actual trampoline, in which case there would be another | |
397 | symbol with the same name corresponding to the real function */ | |
398 | ||
399 | ALL_MSYMBOLS (objfile, msymbol) | |
400 | { | |
401 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
402 | && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol), DEPRECATED_SYMBOL_NAME (msym))) | |
403 | { | |
404 | function_found = 1; | |
405 | break; | |
406 | } | |
407 | } | |
408 | ||
409 | if (function_found) | |
410 | /* the type of msym is correct (mst_solib_trampoline), but | |
411 | the unwind info is wrong, so set it to the correct value */ | |
412 | u->stub_unwind.stub_type = EXPORT; | |
413 | else | |
414 | /* the stub type info in the unwind is correct (this is not a | |
415 | trampoline), but the msym type information is wrong, it | |
416 | should be mst_text. So we need to fix the msym, and also | |
417 | get out of this function */ | |
418 | { | |
419 | MSYMBOL_TYPE (msym) = mst_text; | |
420 | return orig_pc == pc ? 0 : pc & ~0x3; | |
421 | } | |
422 | } | |
423 | ||
424 | /*--------------------------------------------------------------------------*/ | |
425 | } | |
426 | ||
427 | /* It's a stub. Search for a branch and figure out where it goes. | |
428 | Note we have to handle multi insn branch sequences like ldil;ble. | |
429 | Most (all?) other branches can be determined by examining the contents | |
430 | of certain registers and the stack. */ | |
431 | ||
432 | loc = pc; | |
433 | curr_inst = 0; | |
434 | prev_inst = 0; | |
435 | while (1) | |
436 | { | |
437 | /* Make sure we haven't walked outside the range of this stub. */ | |
438 | if (u != find_unwind_entry (loc)) | |
439 | { | |
440 | warning ("Unable to find branch in linker stub"); | |
441 | return orig_pc == pc ? 0 : pc & ~0x3; | |
442 | } | |
443 | ||
444 | prev_inst = curr_inst; | |
445 | curr_inst = read_memory_integer (loc, 4); | |
446 | ||
447 | /* Does it look like a branch external using %r1? Then it's the | |
448 | branch from the stub to the actual function. */ | |
449 | if ((curr_inst & 0xffe0e000) == 0xe0202000) | |
450 | { | |
451 | /* Yup. See if the previous instruction loaded | |
452 | a value into %r1. If so compute and return the jump address. */ | |
453 | if ((prev_inst & 0xffe00000) == 0x20200000) | |
454 | return (hppa_extract_21 (prev_inst) + hppa_extract_17 (curr_inst)) & ~0x3; | |
455 | else | |
456 | { | |
457 | warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."); | |
458 | return orig_pc == pc ? 0 : pc & ~0x3; | |
459 | } | |
460 | } | |
461 | ||
462 | /* Does it look like a be 0(sr0,%r21)? OR | |
463 | Does it look like a be, n 0(sr0,%r21)? OR | |
464 | Does it look like a bve (r21)? (this is on PA2.0) | |
465 | Does it look like a bve, n(r21)? (this is also on PA2.0) | |
466 | That's the branch from an | |
467 | import stub to an export stub. | |
468 | ||
469 | It is impossible to determine the target of the branch via | |
470 | simple examination of instructions and/or data (consider | |
471 | that the address in the plabel may be the address of the | |
472 | bind-on-reference routine in the dynamic loader). | |
473 | ||
474 | So we have try an alternative approach. | |
475 | ||
476 | Get the name of the symbol at our current location; it should | |
477 | be a stub symbol with the same name as the symbol in the | |
478 | shared library. | |
479 | ||
480 | Then lookup a minimal symbol with the same name; we should | |
481 | get the minimal symbol for the target routine in the shared | |
482 | library as those take precedence of import/export stubs. */ | |
483 | if ((curr_inst == 0xe2a00000) || | |
484 | (curr_inst == 0xe2a00002) || | |
485 | (curr_inst == 0xeaa0d000) || | |
486 | (curr_inst == 0xeaa0d002)) | |
487 | { | |
488 | struct minimal_symbol *stubsym, *libsym; | |
489 | ||
490 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
491 | if (stubsym == NULL) | |
492 | { | |
493 | warning ("Unable to find symbol for 0x%lx", loc); | |
494 | return orig_pc == pc ? 0 : pc & ~0x3; | |
495 | } | |
496 | ||
497 | libsym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym), NULL, NULL); | |
498 | if (libsym == NULL) | |
499 | { | |
500 | warning ("Unable to find library symbol for %s\n", | |
501 | DEPRECATED_SYMBOL_NAME (stubsym)); | |
502 | return orig_pc == pc ? 0 : pc & ~0x3; | |
503 | } | |
504 | ||
505 | return SYMBOL_VALUE (libsym); | |
506 | } | |
507 | ||
508 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a | |
509 | branch from the stub to the actual function. */ | |
510 | /*elz */ | |
511 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 | |
512 | || (curr_inst & 0xffe0e000) == 0xe8000000 | |
513 | || (curr_inst & 0xffe0e000) == 0xe800A000) | |
514 | return (loc + hppa_extract_17 (curr_inst) + 8) & ~0x3; | |
515 | ||
516 | /* Does it look like bv (rp)? Note this depends on the | |
517 | current stack pointer being the same as the stack | |
518 | pointer in the stub itself! This is a branch on from the | |
519 | stub back to the original caller. */ | |
520 | /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */ | |
521 | else if ((curr_inst & 0xffe0f000) == 0xe840c000) | |
522 | { | |
523 | /* Yup. See if the previous instruction loaded | |
524 | rp from sp - 8. */ | |
525 | if (prev_inst == 0x4bc23ff1) | |
526 | return (read_memory_integer | |
527 | (read_register (HPPA_SP_REGNUM) - 8, 4)) & ~0x3; | |
528 | else | |
529 | { | |
530 | warning ("Unable to find restore of %%rp before bv (%%rp)."); | |
531 | return orig_pc == pc ? 0 : pc & ~0x3; | |
532 | } | |
533 | } | |
534 | ||
535 | /* elz: added this case to capture the new instruction | |
536 | at the end of the return part of an export stub used by | |
537 | the PA2.0: BVE, n (rp) */ | |
538 | else if ((curr_inst & 0xffe0f000) == 0xe840d000) | |
539 | { | |
540 | return (read_memory_integer | |
541 | (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; | |
542 | } | |
543 | ||
544 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
545 | the original caller from the stub. Used in dynamic executables. */ | |
546 | else if (curr_inst == 0xe0400002) | |
547 | { | |
548 | /* The value we jump to is sitting in sp - 24. But that's | |
549 | loaded several instructions before the be instruction. | |
550 | I guess we could check for the previous instruction being | |
551 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
552 | return (read_memory_integer | |
553 | (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; | |
554 | } | |
555 | ||
556 | /* Haven't found the branch yet, but we're still in the stub. | |
557 | Keep looking. */ | |
558 | loc += 4; | |
559 | } | |
560 | } | |
561 | ||
562 | ||
4c02c60c AC |
563 | /* Exception handling support for the HP-UX ANSI C++ compiler. |
564 | The compiler (aCC) provides a callback for exception events; | |
565 | GDB can set a breakpoint on this callback and find out what | |
566 | exception event has occurred. */ | |
567 | ||
568 | /* The name of the hook to be set to point to the callback function */ | |
569 | static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; | |
570 | /* The name of the function to be used to set the hook value */ | |
571 | static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; | |
572 | /* The name of the callback function in end.o */ | |
573 | static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; | |
574 | /* Name of function in end.o on which a break is set (called by above) */ | |
575 | static char HP_ACC_EH_break[] = "__d_eh_break"; | |
576 | /* Name of flag (in end.o) that enables catching throws */ | |
577 | static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; | |
578 | /* Name of flag (in end.o) that enables catching catching */ | |
579 | static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; | |
580 | /* The enum used by aCC */ | |
581 | typedef enum | |
582 | { | |
583 | __EH_NOTIFY_THROW, | |
584 | __EH_NOTIFY_CATCH | |
585 | } | |
586 | __eh_notification; | |
587 | ||
588 | /* Is exception-handling support available with this executable? */ | |
589 | static int hp_cxx_exception_support = 0; | |
590 | /* Has the initialize function been run? */ | |
591 | int hp_cxx_exception_support_initialized = 0; | |
4c02c60c AC |
592 | /* Address of __eh_notify_hook */ |
593 | static CORE_ADDR eh_notify_hook_addr = 0; | |
594 | /* Address of __d_eh_notify_callback */ | |
595 | static CORE_ADDR eh_notify_callback_addr = 0; | |
596 | /* Address of __d_eh_break */ | |
597 | static CORE_ADDR eh_break_addr = 0; | |
598 | /* Address of __d_eh_catch_catch */ | |
599 | static CORE_ADDR eh_catch_catch_addr = 0; | |
600 | /* Address of __d_eh_catch_throw */ | |
601 | static CORE_ADDR eh_catch_throw_addr = 0; | |
602 | /* Sal for __d_eh_break */ | |
603 | static struct symtab_and_line *break_callback_sal = 0; | |
604 | ||
605 | /* Code in end.c expects __d_pid to be set in the inferior, | |
606 | otherwise __d_eh_notify_callback doesn't bother to call | |
607 | __d_eh_break! So we poke the pid into this symbol | |
608 | ourselves. | |
609 | 0 => success | |
610 | 1 => failure */ | |
611 | int | |
612 | setup_d_pid_in_inferior (void) | |
613 | { | |
614 | CORE_ADDR anaddr; | |
615 | struct minimal_symbol *msymbol; | |
616 | char buf[4]; /* FIXME 32x64? */ | |
617 | ||
618 | /* Slam the pid of the process into __d_pid; failing is only a warning! */ | |
619 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
620 | if (msymbol == NULL) | |
621 | { | |
622 | warning ("Unable to find __d_pid symbol in object file."); | |
623 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
624 | return 1; | |
625 | } | |
626 | ||
627 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
628 | store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */ | |
629 | if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ | |
630 | { | |
631 | warning ("Unable to write __d_pid"); | |
632 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
633 | return 1; | |
634 | } | |
635 | return 0; | |
636 | } | |
637 | ||
638 | /* elz: Used to lookup a symbol in the shared libraries. | |
639 | This function calls shl_findsym, indirectly through a | |
640 | call to __d_shl_get. __d_shl_get is in end.c, which is always | |
641 | linked in by the hp compilers/linkers. | |
642 | The call to shl_findsym cannot be made directly because it needs | |
643 | to be active in target address space. | |
644 | inputs: - minimal symbol pointer for the function we want to look up | |
645 | - address in target space of the descriptor for the library | |
646 | where we want to look the symbol up. | |
647 | This address is retrieved using the | |
648 | som_solib_get_solib_by_pc function (somsolib.c). | |
649 | output: - real address in the library of the function. | |
650 | note: the handle can be null, in which case shl_findsym will look for | |
651 | the symbol in all the loaded shared libraries. | |
652 | files to look at if you need reference on this stuff: | |
653 | dld.c, dld_shl_findsym.c | |
654 | end.c | |
655 | man entry for shl_findsym */ | |
656 | ||
657 | CORE_ADDR | |
658 | find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle) | |
659 | { | |
660 | struct symbol *get_sym, *symbol2; | |
661 | struct minimal_symbol *buff_minsym, *msymbol; | |
662 | struct type *ftype; | |
663 | struct value **args; | |
664 | struct value *funcval; | |
665 | struct value *val; | |
666 | ||
667 | int x, namelen, err_value, tmp = -1; | |
668 | CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; | |
669 | CORE_ADDR stub_addr; | |
670 | ||
671 | ||
672 | args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */ | |
673 | funcval = find_function_in_inferior ("__d_shl_get"); | |
674 | get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_DOMAIN, NULL, NULL); | |
675 | buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL); | |
676 | msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); | |
677 | symbol2 = lookup_symbol ("__shldp", NULL, VAR_DOMAIN, NULL, NULL); | |
678 | endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); | |
679 | namelen = strlen (DEPRECATED_SYMBOL_NAME (function)); | |
680 | value_return_addr = endo_buff_addr + namelen; | |
681 | ftype = check_typedef (SYMBOL_TYPE (get_sym)); | |
682 | ||
683 | /* do alignment */ | |
684 | if ((x = value_return_addr % 64) != 0) | |
685 | value_return_addr = value_return_addr + 64 - x; | |
686 | ||
687 | errno_return_addr = value_return_addr + 64; | |
688 | ||
689 | ||
690 | /* set up stuff needed by __d_shl_get in buffer in end.o */ | |
691 | ||
692 | target_write_memory (endo_buff_addr, DEPRECATED_SYMBOL_NAME (function), namelen); | |
693 | ||
694 | target_write_memory (value_return_addr, (char *) &tmp, 4); | |
695 | ||
696 | target_write_memory (errno_return_addr, (char *) &tmp, 4); | |
697 | ||
698 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
699 | (char *) &handle, 4); | |
700 | ||
701 | /* now prepare the arguments for the call */ | |
702 | ||
703 | args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12); | |
704 | args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol)); | |
705 | args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr); | |
706 | args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE); | |
707 | args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr); | |
708 | args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr); | |
709 | ||
710 | /* now call the function */ | |
711 | ||
712 | val = call_function_by_hand (funcval, 6, args); | |
713 | ||
714 | /* now get the results */ | |
715 | ||
716 | target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value)); | |
717 | ||
718 | target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr)); | |
719 | if (stub_addr <= 0) | |
720 | error ("call to __d_shl_get failed, error code is %d", err_value); | |
721 | ||
722 | return (stub_addr); | |
723 | } | |
724 | ||
725 | /* Cover routine for find_stub_with_shl_get to pass to catch_errors */ | |
726 | static int | |
727 | cover_find_stub_with_shl_get (void *args_untyped) | |
728 | { | |
729 | args_for_find_stub *args = args_untyped; | |
730 | args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | /* Initialize exception catchpoint support by looking for the | |
735 | necessary hooks/callbacks in end.o, etc., and set the hook value to | |
736 | point to the required debug function | |
737 | ||
738 | Return 0 => failure | |
739 | 1 => success */ | |
740 | ||
741 | static int | |
742 | initialize_hp_cxx_exception_support (void) | |
743 | { | |
744 | struct symtabs_and_lines sals; | |
745 | struct cleanup *old_chain; | |
746 | struct cleanup *canonical_strings_chain = NULL; | |
747 | int i; | |
748 | char *addr_start; | |
749 | char *addr_end = NULL; | |
750 | char **canonical = (char **) NULL; | |
751 | int thread = -1; | |
752 | struct symbol *sym = NULL; | |
753 | struct minimal_symbol *msym = NULL; | |
754 | struct objfile *objfile; | |
755 | asection *shlib_info; | |
756 | ||
757 | /* Detect and disallow recursion. On HP-UX with aCC, infinite | |
758 | recursion is a possibility because finding the hook for exception | |
759 | callbacks involves making a call in the inferior, which means | |
760 | re-inserting breakpoints which can re-invoke this code */ | |
761 | ||
762 | static int recurse = 0; | |
763 | if (recurse > 0) | |
764 | { | |
765 | hp_cxx_exception_support_initialized = 0; | |
f83f82bc | 766 | deprecated_exception_support_initialized = 0; |
4c02c60c AC |
767 | return 0; |
768 | } | |
769 | ||
770 | hp_cxx_exception_support = 0; | |
771 | ||
772 | /* First check if we have seen any HP compiled objects; if not, | |
773 | it is very unlikely that HP's idiosyncratic callback mechanism | |
774 | for exception handling debug support will be available! | |
775 | This will percolate back up to breakpoint.c, where our callers | |
776 | will decide to try the g++ exception-handling support instead. */ | |
f83f82bc | 777 | if (!deprecated_hp_som_som_object_present) |
4c02c60c AC |
778 | return 0; |
779 | ||
780 | /* We have a SOM executable with SOM debug info; find the hooks */ | |
781 | ||
782 | /* First look for the notify hook provided by aCC runtime libs */ | |
783 | /* If we find this symbol, we conclude that the executable must | |
784 | have HP aCC exception support built in. If this symbol is not | |
785 | found, even though we're a HP SOM-SOM file, we may have been | |
786 | built with some other compiler (not aCC). This results percolates | |
787 | back up to our callers in breakpoint.c which can decide to | |
788 | try the g++ style of exception support instead. | |
789 | If this symbol is found but the other symbols we require are | |
790 | not found, there is something weird going on, and g++ support | |
791 | should *not* be tried as an alternative. | |
792 | ||
793 | ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. | |
794 | ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ | |
795 | ||
796 | /* libCsup has this hook; it'll usually be non-debuggable */ | |
797 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); | |
798 | if (msym) | |
799 | { | |
800 | eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); | |
801 | hp_cxx_exception_support = 1; | |
802 | } | |
803 | else | |
804 | { | |
805 | warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook); | |
806 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
807 | warning ("GDB will be unable to intercept exception events."); | |
808 | eh_notify_hook_addr = 0; | |
809 | hp_cxx_exception_support = 0; | |
810 | return 0; | |
811 | } | |
812 | ||
813 | /* Next look for the notify callback routine in end.o */ | |
814 | /* This is always available in the SOM symbol dictionary if end.o is linked in */ | |
815 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); | |
816 | if (msym) | |
817 | { | |
818 | eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); | |
819 | hp_cxx_exception_support = 1; | |
820 | } | |
821 | else | |
822 | { | |
823 | warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback); | |
824 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
825 | warning ("GDB will be unable to intercept exception events."); | |
826 | eh_notify_callback_addr = 0; | |
827 | return 0; | |
828 | } | |
829 | ||
830 | #ifndef GDB_TARGET_IS_HPPA_20W | |
831 | /* Check whether the executable is dynamically linked or archive bound */ | |
832 | /* With an archive-bound executable we can use the raw addresses we find | |
833 | for the callback function, etc. without modification. For an executable | |
834 | with shared libraries, we have to do more work to find the plabel, which | |
835 | can be the target of a call through $$dyncall from the aCC runtime support | |
836 | library (libCsup) which is linked shared by default by aCC. */ | |
837 | /* This test below was copied from somsolib.c/somread.c. It may not be a very | |
838 | reliable one to test that an executable is linked shared. pai/1997-07-18 */ | |
839 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); | |
840 | if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) | |
841 | { | |
842 | /* The minsym we have has the local code address, but that's not the | |
843 | plabel that can be used by an inter-load-module call. */ | |
844 | /* Find solib handle for main image (which has end.o), and use that | |
845 | and the min sym as arguments to __d_shl_get() (which does the equivalent | |
846 | of shl_findsym()) to find the plabel. */ | |
847 | ||
848 | args_for_find_stub args; | |
849 | static char message[] = "Error while finding exception callback hook:\n"; | |
850 | ||
851 | args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr); | |
852 | args.msym = msym; | |
853 | args.return_val = 0; | |
854 | ||
855 | recurse++; | |
856 | catch_errors (cover_find_stub_with_shl_get, &args, message, | |
857 | RETURN_MASK_ALL); | |
858 | eh_notify_callback_addr = args.return_val; | |
859 | recurse--; | |
860 | ||
f83f82bc | 861 | deprecated_exception_catchpoints_are_fragile = 1; |
4c02c60c AC |
862 | |
863 | if (!eh_notify_callback_addr) | |
864 | { | |
865 | /* We can get here either if there is no plabel in the export list | |
866 | for the main image, or if something strange happened (?) */ | |
867 | warning ("Couldn't find a plabel (indirect function label) for the exception callback."); | |
868 | warning ("GDB will not be able to intercept exception events."); | |
869 | return 0; | |
870 | } | |
871 | } | |
872 | else | |
f83f82bc | 873 | deprecated_exception_catchpoints_are_fragile = 0; |
4c02c60c AC |
874 | #endif |
875 | ||
876 | /* Now, look for the breakpointable routine in end.o */ | |
877 | /* This should also be available in the SOM symbol dict. if end.o linked in */ | |
878 | msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); | |
879 | if (msym) | |
880 | { | |
881 | eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); | |
882 | hp_cxx_exception_support = 1; | |
883 | } | |
884 | else | |
885 | { | |
886 | warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break); | |
887 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
888 | warning ("GDB will be unable to intercept exception events."); | |
889 | eh_break_addr = 0; | |
890 | return 0; | |
891 | } | |
892 | ||
893 | /* Next look for the catch enable flag provided in end.o */ | |
894 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
895 | VAR_DOMAIN, 0, (struct symtab **) NULL); | |
896 | if (sym) /* sometimes present in debug info */ | |
897 | { | |
898 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); | |
899 | hp_cxx_exception_support = 1; | |
900 | } | |
901 | else | |
902 | /* otherwise look in SOM symbol dict. */ | |
903 | { | |
904 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); | |
905 | if (msym) | |
906 | { | |
907 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); | |
908 | hp_cxx_exception_support = 1; | |
909 | } | |
910 | else | |
911 | { | |
912 | warning ("Unable to enable interception of exception catches."); | |
913 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
914 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
915 | return 0; | |
916 | } | |
917 | } | |
918 | ||
919 | /* Next look for the catch enable flag provided end.o */ | |
920 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
921 | VAR_DOMAIN, 0, (struct symtab **) NULL); | |
922 | if (sym) /* sometimes present in debug info */ | |
923 | { | |
924 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); | |
925 | hp_cxx_exception_support = 1; | |
926 | } | |
927 | else | |
928 | /* otherwise look in SOM symbol dict. */ | |
929 | { | |
930 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); | |
931 | if (msym) | |
932 | { | |
933 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); | |
934 | hp_cxx_exception_support = 1; | |
935 | } | |
936 | else | |
937 | { | |
938 | warning ("Unable to enable interception of exception throws."); | |
939 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
940 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
941 | return 0; | |
942 | } | |
943 | } | |
944 | ||
945 | /* Set the flags */ | |
946 | hp_cxx_exception_support = 2; /* everything worked so far */ | |
947 | hp_cxx_exception_support_initialized = 1; | |
f83f82bc | 948 | deprecated_exception_support_initialized = 1; |
4c02c60c AC |
949 | |
950 | return 1; | |
951 | } | |
952 | ||
953 | /* Target operation for enabling or disabling interception of | |
954 | exception events. | |
955 | KIND is either EX_EVENT_THROW or EX_EVENT_CATCH | |
956 | ENABLE is either 0 (disable) or 1 (enable). | |
957 | Return value is NULL if no support found; | |
958 | -1 if something went wrong, | |
959 | or a pointer to a symtab/line struct if the breakpointable | |
960 | address was found. */ | |
961 | ||
962 | struct symtab_and_line * | |
963 | child_enable_exception_callback (enum exception_event_kind kind, int enable) | |
964 | { | |
965 | char buf[4]; | |
966 | ||
f83f82bc AC |
967 | if (!deprecated_exception_support_initialized |
968 | || !hp_cxx_exception_support_initialized) | |
4c02c60c AC |
969 | if (!initialize_hp_cxx_exception_support ()) |
970 | return NULL; | |
971 | ||
972 | switch (hp_cxx_exception_support) | |
973 | { | |
974 | case 0: | |
975 | /* Assuming no HP support at all */ | |
976 | return NULL; | |
977 | case 1: | |
978 | /* HP support should be present, but something went wrong */ | |
979 | return (struct symtab_and_line *) -1; /* yuck! */ | |
980 | /* there may be other cases in the future */ | |
981 | } | |
982 | ||
983 | /* Set the EH hook to point to the callback routine */ | |
984 | store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ | |
985 | /* pai: (temp) FIXME should there be a pack operation first? */ | |
986 | if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ | |
987 | { | |
988 | warning ("Could not write to target memory for exception event callback."); | |
989 | warning ("Interception of exception events may not work."); | |
990 | return (struct symtab_and_line *) -1; | |
991 | } | |
992 | if (enable) | |
993 | { | |
994 | /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */ | |
995 | if (PIDGET (inferior_ptid) > 0) | |
996 | { | |
997 | if (setup_d_pid_in_inferior ()) | |
998 | return (struct symtab_and_line *) -1; | |
999 | } | |
1000 | else | |
1001 | { | |
1002 | warning ("Internal error: Invalid inferior pid? Cannot intercept exception events."); | |
1003 | return (struct symtab_and_line *) -1; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | switch (kind) | |
1008 | { | |
1009 | case EX_EVENT_THROW: | |
1010 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
1011 | if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ | |
1012 | { | |
1013 | warning ("Couldn't enable exception throw interception."); | |
1014 | return (struct symtab_and_line *) -1; | |
1015 | } | |
1016 | break; | |
1017 | case EX_EVENT_CATCH: | |
1018 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
1019 | if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ | |
1020 | { | |
1021 | warning ("Couldn't enable exception catch interception."); | |
1022 | return (struct symtab_and_line *) -1; | |
1023 | } | |
1024 | break; | |
1025 | default: | |
1026 | error ("Request to enable unknown or unsupported exception event."); | |
1027 | } | |
1028 | ||
1029 | /* Copy break address into new sal struct, malloc'ing if needed. */ | |
1030 | if (!break_callback_sal) | |
1031 | { | |
1032 | break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); | |
1033 | } | |
1034 | init_sal (break_callback_sal); | |
1035 | break_callback_sal->symtab = NULL; | |
1036 | break_callback_sal->pc = eh_break_addr; | |
1037 | break_callback_sal->line = 0; | |
1038 | break_callback_sal->end = eh_break_addr; | |
1039 | ||
1040 | return break_callback_sal; | |
1041 | } | |
1042 | ||
1043 | /* Record some information about the current exception event */ | |
1044 | static struct exception_event_record current_ex_event; | |
1045 | /* Convenience struct */ | |
1046 | static struct symtab_and_line null_symtab_and_line = | |
1047 | {NULL, 0, 0, 0}; | |
1048 | ||
1049 | /* Report current exception event. Returns a pointer to a record | |
1050 | that describes the kind of the event, where it was thrown from, | |
1051 | and where it will be caught. More information may be reported | |
1052 | in the future */ | |
1053 | struct exception_event_record * | |
1054 | child_get_current_exception_event (void) | |
1055 | { | |
1056 | CORE_ADDR event_kind; | |
1057 | CORE_ADDR throw_addr; | |
1058 | CORE_ADDR catch_addr; | |
1059 | struct frame_info *fi, *curr_frame; | |
1060 | int level = 1; | |
1061 | ||
1062 | curr_frame = get_current_frame (); | |
1063 | if (!curr_frame) | |
1064 | return (struct exception_event_record *) NULL; | |
1065 | ||
1066 | /* Go up one frame to __d_eh_notify_callback, because at the | |
1067 | point when this code is executed, there's garbage in the | |
1068 | arguments of __d_eh_break. */ | |
1069 | fi = find_relative_frame (curr_frame, &level); | |
1070 | if (level != 0) | |
1071 | return (struct exception_event_record *) NULL; | |
1072 | ||
1073 | select_frame (fi); | |
1074 | ||
1075 | /* Read in the arguments */ | |
1076 | /* __d_eh_notify_callback() is called with 3 arguments: | |
1077 | 1. event kind catch or throw | |
1078 | 2. the target address if known | |
1079 | 3. a flag -- not sure what this is. pai/1997-07-17 */ | |
34f75cc1 RC |
1080 | event_kind = read_register (HPPA_ARG0_REGNUM); |
1081 | catch_addr = read_register (HPPA_ARG1_REGNUM); | |
4c02c60c AC |
1082 | |
1083 | /* Now go down to a user frame */ | |
1084 | /* For a throw, __d_eh_break is called by | |
1085 | __d_eh_notify_callback which is called by | |
1086 | __notify_throw which is called | |
1087 | from user code. | |
1088 | For a catch, __d_eh_break is called by | |
1089 | __d_eh_notify_callback which is called by | |
1090 | <stackwalking stuff> which is called by | |
1091 | __throw__<stuff> or __rethrow_<stuff> which is called | |
1092 | from user code. */ | |
1093 | /* FIXME: Don't use such magic numbers; search for the frames */ | |
1094 | level = (event_kind == EX_EVENT_THROW) ? 3 : 4; | |
1095 | fi = find_relative_frame (curr_frame, &level); | |
1096 | if (level != 0) | |
1097 | return (struct exception_event_record *) NULL; | |
1098 | ||
1099 | select_frame (fi); | |
1100 | throw_addr = get_frame_pc (fi); | |
1101 | ||
1102 | /* Go back to original (top) frame */ | |
1103 | select_frame (curr_frame); | |
1104 | ||
1105 | current_ex_event.kind = (enum exception_event_kind) event_kind; | |
1106 | current_ex_event.throw_sal = find_pc_line (throw_addr, 1); | |
1107 | current_ex_event.catch_sal = find_pc_line (catch_addr, 1); | |
1108 | ||
1109 | return ¤t_ex_event; | |
1110 | } | |
1111 | ||
43613416 RC |
1112 | /* Signal frames. */ |
1113 | struct hppa_hpux_sigtramp_unwind_cache | |
1114 | { | |
1115 | CORE_ADDR base; | |
1116 | struct trad_frame_saved_reg *saved_regs; | |
1117 | }; | |
1118 | ||
1119 | static int hppa_hpux_tramp_reg[] = { | |
1120 | HPPA_SAR_REGNUM, | |
1121 | HPPA_PCOQ_HEAD_REGNUM, | |
1122 | HPPA_PCSQ_HEAD_REGNUM, | |
1123 | HPPA_PCOQ_TAIL_REGNUM, | |
1124 | HPPA_PCSQ_TAIL_REGNUM, | |
1125 | HPPA_EIEM_REGNUM, | |
1126 | HPPA_IIR_REGNUM, | |
1127 | HPPA_ISR_REGNUM, | |
1128 | HPPA_IOR_REGNUM, | |
1129 | HPPA_IPSW_REGNUM, | |
1130 | -1, | |
1131 | HPPA_SR4_REGNUM, | |
1132 | HPPA_SR4_REGNUM + 1, | |
1133 | HPPA_SR4_REGNUM + 2, | |
1134 | HPPA_SR4_REGNUM + 3, | |
1135 | HPPA_SR4_REGNUM + 4, | |
1136 | HPPA_SR4_REGNUM + 5, | |
1137 | HPPA_SR4_REGNUM + 6, | |
1138 | HPPA_SR4_REGNUM + 7, | |
1139 | HPPA_RCR_REGNUM, | |
1140 | HPPA_PID0_REGNUM, | |
1141 | HPPA_PID1_REGNUM, | |
1142 | HPPA_CCR_REGNUM, | |
1143 | HPPA_PID2_REGNUM, | |
1144 | HPPA_PID3_REGNUM, | |
1145 | HPPA_TR0_REGNUM, | |
1146 | HPPA_TR0_REGNUM + 1, | |
1147 | HPPA_TR0_REGNUM + 2, | |
1148 | HPPA_CR27_REGNUM | |
1149 | }; | |
1150 | ||
1151 | static struct hppa_hpux_sigtramp_unwind_cache * | |
1152 | hppa_hpux_sigtramp_frame_unwind_cache (struct frame_info *next_frame, | |
1153 | void **this_cache) | |
1154 | ||
1155 | { | |
1156 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
1157 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1158 | struct hppa_hpux_sigtramp_unwind_cache *info; | |
1159 | unsigned int flag; | |
1160 | CORE_ADDR sp, scptr; | |
1161 | int i, incr, off, szoff; | |
1162 | ||
1163 | if (*this_cache) | |
1164 | return *this_cache; | |
1165 | ||
1166 | info = FRAME_OBSTACK_ZALLOC (struct hppa_hpux_sigtramp_unwind_cache); | |
1167 | *this_cache = info; | |
1168 | info->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
1169 | ||
1170 | sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); | |
1171 | ||
1172 | scptr = sp - 1352; | |
1173 | off = scptr; | |
1174 | ||
1175 | /* See /usr/include/machine/save_state.h for the structure of the save_state_t | |
1176 | structure. */ | |
1177 | ||
1178 | flag = read_memory_unsigned_integer(scptr, 4); | |
1179 | ||
1180 | if (!(flag & 0x40)) | |
1181 | { | |
1182 | /* Narrow registers. */ | |
1183 | off = scptr + offsetof (save_state_t, ss_narrow); | |
1184 | incr = 4; | |
1185 | szoff = 0; | |
1186 | } | |
1187 | else | |
1188 | { | |
1189 | /* Wide registers. */ | |
1190 | off = scptr + offsetof (save_state_t, ss_wide) + 8; | |
1191 | incr = 8; | |
1192 | szoff = (tdep->bytes_per_address == 4 ? 4 : 0); | |
1193 | } | |
1194 | ||
1195 | for (i = 1; i < 32; i++) | |
1196 | { | |
1197 | info->saved_regs[HPPA_R0_REGNUM + i].addr = off + szoff; | |
1198 | off += incr; | |
1199 | } | |
1200 | ||
1201 | for (i = 0; | |
1202 | i < sizeof(hppa_hpux_tramp_reg) / sizeof(hppa_hpux_tramp_reg[0]); | |
1203 | i++) | |
1204 | { | |
1205 | if (hppa_hpux_tramp_reg[i] > 0) | |
1206 | info->saved_regs[hppa_hpux_tramp_reg[i]].addr = off + szoff; | |
1207 | off += incr; | |
1208 | } | |
1209 | ||
1210 | /* TODO: fp regs */ | |
1211 | ||
1212 | info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); | |
1213 | ||
1214 | return info; | |
1215 | } | |
1216 | ||
1217 | static void | |
1218 | hppa_hpux_sigtramp_frame_this_id (struct frame_info *next_frame, | |
1219 | void **this_prologue_cache, | |
1220 | struct frame_id *this_id) | |
1221 | { | |
1222 | struct hppa_hpux_sigtramp_unwind_cache *info | |
1223 | = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
1224 | *this_id = frame_id_build (info->base, frame_pc_unwind (next_frame)); | |
1225 | } | |
1226 | ||
1227 | static void | |
1228 | hppa_hpux_sigtramp_frame_prev_register (struct frame_info *next_frame, | |
1229 | void **this_prologue_cache, | |
1230 | int regnum, int *optimizedp, | |
1231 | enum lval_type *lvalp, | |
1232 | CORE_ADDR *addrp, | |
1233 | int *realnump, void *valuep) | |
1234 | { | |
1235 | struct hppa_hpux_sigtramp_unwind_cache *info | |
1236 | = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
1237 | hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum, | |
1238 | optimizedp, lvalp, addrp, realnump, valuep); | |
1239 | } | |
1240 | ||
1241 | static const struct frame_unwind hppa_hpux_sigtramp_frame_unwind = { | |
1242 | SIGTRAMP_FRAME, | |
1243 | hppa_hpux_sigtramp_frame_this_id, | |
1244 | hppa_hpux_sigtramp_frame_prev_register | |
1245 | }; | |
1246 | ||
1247 | static const struct frame_unwind * | |
1248 | hppa_hpux_sigtramp_unwind_sniffer (struct frame_info *next_frame) | |
1249 | { | |
1250 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
1251 | char *name; | |
1252 | ||
1253 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1254 | ||
1255 | if (name && strcmp(name, "_sigreturn") == 0) | |
1256 | return &hppa_hpux_sigtramp_frame_unwind; | |
1257 | ||
1258 | return NULL; | |
1259 | } | |
1260 | ||
7d773d96 JB |
1261 | static void |
1262 | hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1263 | { | |
abc485a1 RC |
1264 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1265 | ||
abc485a1 RC |
1266 | if (tdep->bytes_per_address == 4) |
1267 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
1268 | hppa32_hpux_in_solib_call_trampoline); | |
1269 | else | |
1270 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
1271 | hppa64_hpux_in_solib_call_trampoline); | |
1272 | ||
1273 | set_gdbarch_in_solib_return_trampoline (gdbarch, | |
1274 | hppa_hpux_in_solib_return_trampoline); | |
1275 | set_gdbarch_skip_trampoline_code (gdbarch, hppa_hpux_skip_trampoline_code); | |
43613416 RC |
1276 | |
1277 | frame_unwind_append_sniffer (gdbarch, hppa_hpux_sigtramp_unwind_sniffer); | |
7d773d96 | 1278 | } |
60e1ff27 | 1279 | |
273f8429 JB |
1280 | static void |
1281 | hppa_hpux_som_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1282 | { | |
fdd72f95 RC |
1283 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1284 | ||
1285 | tdep->is_elf = 0; | |
7d773d96 | 1286 | hppa_hpux_init_abi (info, gdbarch); |
273f8429 JB |
1287 | } |
1288 | ||
1289 | static void | |
1290 | hppa_hpux_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1291 | { | |
fdd72f95 RC |
1292 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1293 | ||
1294 | tdep->is_elf = 1; | |
7d773d96 | 1295 | hppa_hpux_init_abi (info, gdbarch); |
273f8429 JB |
1296 | } |
1297 | ||
1298 | void | |
1299 | _initialize_hppa_hpux_tdep (void) | |
1300 | { | |
05816f70 | 1301 | gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_HPUX_SOM, |
273f8429 | 1302 | hppa_hpux_som_init_abi); |
51db5742 | 1303 | gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_HPUX_ELF, |
273f8429 JB |
1304 | hppa_hpux_elf_init_abi); |
1305 | } |