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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" | |
90f943f1 | 33 | #include "observer.h" |
fdd72f95 | 34 | #include "hppa-tdep.h" |
4c02c60c AC |
35 | |
36 | #include <dl.h> | |
37 | #include <machine/save_state.h> | |
273f8429 | 38 | |
43613416 RC |
39 | #ifndef offsetof |
40 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
41 | #endif | |
42 | ||
273f8429 JB |
43 | /* Forward declarations. */ |
44 | extern void _initialize_hppa_hpux_tdep (void); | |
45 | extern initialize_file_ftype _initialize_hppa_hpux_tdep; | |
46 | ||
4c02c60c AC |
47 | typedef struct |
48 | { | |
49 | struct minimal_symbol *msym; | |
50 | CORE_ADDR solib_handle; | |
51 | CORE_ADDR return_val; | |
52 | } | |
53 | args_for_find_stub; | |
54 | ||
abc485a1 RC |
55 | /* Return one if PC is in the call path of a trampoline, else return zero. |
56 | ||
57 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
58 | just shared library trampolines (import, export). */ | |
59 | ||
60 | static int | |
61 | hppa32_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
62 | { | |
63 | struct minimal_symbol *minsym; | |
64 | struct unwind_table_entry *u; | |
abc485a1 RC |
65 | |
66 | /* First see if PC is in one of the two C-library trampolines. */ | |
3388d7ff RC |
67 | if (pc == hppa_symbol_address("$$dyncall") |
68 | || pc == hppa_symbol_address("_sr4export")) | |
abc485a1 RC |
69 | return 1; |
70 | ||
71 | minsym = lookup_minimal_symbol_by_pc (pc); | |
72 | if (minsym && strcmp (DEPRECATED_SYMBOL_NAME (minsym), ".stub") == 0) | |
73 | return 1; | |
74 | ||
75 | /* Get the unwind descriptor corresponding to PC, return zero | |
76 | if no unwind was found. */ | |
77 | u = find_unwind_entry (pc); | |
78 | if (!u) | |
79 | return 0; | |
80 | ||
81 | /* If this isn't a linker stub, then return now. */ | |
82 | if (u->stub_unwind.stub_type == 0) | |
83 | return 0; | |
84 | ||
85 | /* By definition a long-branch stub is a call stub. */ | |
86 | if (u->stub_unwind.stub_type == LONG_BRANCH) | |
87 | return 1; | |
88 | ||
89 | /* The call and return path execute the same instructions within | |
90 | an IMPORT stub! So an IMPORT stub is both a call and return | |
91 | trampoline. */ | |
92 | if (u->stub_unwind.stub_type == IMPORT) | |
93 | return 1; | |
94 | ||
95 | /* Parameter relocation stubs always have a call path and may have a | |
96 | return path. */ | |
97 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
98 | || u->stub_unwind.stub_type == EXPORT) | |
99 | { | |
100 | CORE_ADDR addr; | |
101 | ||
102 | /* Search forward from the current PC until we hit a branch | |
103 | or the end of the stub. */ | |
104 | for (addr = pc; addr <= u->region_end; addr += 4) | |
105 | { | |
106 | unsigned long insn; | |
107 | ||
108 | insn = read_memory_integer (addr, 4); | |
109 | ||
110 | /* Does it look like a bl? If so then it's the call path, if | |
111 | we find a bv or be first, then we're on the return path. */ | |
112 | if ((insn & 0xfc00e000) == 0xe8000000) | |
113 | return 1; | |
114 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
115 | || (insn & 0xfc000000) == 0xe0000000) | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* Should never happen. */ | |
120 | warning ("Unable to find branch in parameter relocation stub.\n"); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | /* Unknown stub type. For now, just return zero. */ | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static int | |
129 | hppa64_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
130 | { | |
131 | /* PA64 has a completely different stub/trampoline scheme. Is it | |
132 | better? Maybe. It's certainly harder to determine with any | |
133 | certainty that we are in a stub because we can not refer to the | |
134 | unwinders to help. | |
135 | ||
136 | The heuristic is simple. Try to lookup the current PC value in th | |
137 | minimal symbol table. If that fails, then assume we are not in a | |
138 | stub and return. | |
139 | ||
140 | Then see if the PC value falls within the section bounds for the | |
141 | section containing the minimal symbol we found in the first | |
142 | step. If it does, then assume we are not in a stub and return. | |
143 | ||
144 | Finally peek at the instructions to see if they look like a stub. */ | |
145 | struct minimal_symbol *minsym; | |
146 | asection *sec; | |
147 | CORE_ADDR addr; | |
148 | int insn, i; | |
149 | ||
150 | minsym = lookup_minimal_symbol_by_pc (pc); | |
151 | if (! minsym) | |
152 | return 0; | |
153 | ||
154 | sec = SYMBOL_BFD_SECTION (minsym); | |
155 | ||
156 | if (bfd_get_section_vma (sec->owner, sec) <= pc | |
157 | && pc < (bfd_get_section_vma (sec->owner, sec) | |
158 | + bfd_section_size (sec->owner, sec))) | |
159 | return 0; | |
160 | ||
161 | /* We might be in a stub. Peek at the instructions. Stubs are 3 | |
162 | instructions long. */ | |
163 | insn = read_memory_integer (pc, 4); | |
164 | ||
165 | /* Find out where we think we are within the stub. */ | |
166 | if ((insn & 0xffffc00e) == 0x53610000) | |
167 | addr = pc; | |
168 | else if ((insn & 0xffffffff) == 0xe820d000) | |
169 | addr = pc - 4; | |
170 | else if ((insn & 0xffffc00e) == 0x537b0000) | |
171 | addr = pc - 8; | |
172 | else | |
173 | return 0; | |
174 | ||
175 | /* Now verify each insn in the range looks like a stub instruction. */ | |
176 | insn = read_memory_integer (addr, 4); | |
177 | if ((insn & 0xffffc00e) != 0x53610000) | |
178 | return 0; | |
179 | ||
180 | /* Now verify each insn in the range looks like a stub instruction. */ | |
181 | insn = read_memory_integer (addr + 4, 4); | |
182 | if ((insn & 0xffffffff) != 0xe820d000) | |
183 | return 0; | |
184 | ||
185 | /* Now verify each insn in the range looks like a stub instruction. */ | |
186 | insn = read_memory_integer (addr + 8, 4); | |
187 | if ((insn & 0xffffc00e) != 0x537b0000) | |
188 | return 0; | |
189 | ||
190 | /* Looks like a stub. */ | |
191 | return 1; | |
192 | } | |
193 | ||
194 | /* Return one if PC is in the return path of a trampoline, else return zero. | |
195 | ||
196 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
197 | just shared library trampolines (import, export). */ | |
198 | ||
199 | static int | |
200 | hppa_hpux_in_solib_return_trampoline (CORE_ADDR pc, char *name) | |
201 | { | |
202 | struct unwind_table_entry *u; | |
203 | ||
204 | /* Get the unwind descriptor corresponding to PC, return zero | |
205 | if no unwind was found. */ | |
206 | u = find_unwind_entry (pc); | |
207 | if (!u) | |
208 | return 0; | |
209 | ||
210 | /* If this isn't a linker stub or it's just a long branch stub, then | |
211 | return zero. */ | |
212 | if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) | |
213 | return 0; | |
214 | ||
215 | /* The call and return path execute the same instructions within | |
216 | an IMPORT stub! So an IMPORT stub is both a call and return | |
217 | trampoline. */ | |
218 | if (u->stub_unwind.stub_type == IMPORT) | |
219 | return 1; | |
220 | ||
221 | /* Parameter relocation stubs always have a call path and may have a | |
222 | return path. */ | |
223 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
224 | || u->stub_unwind.stub_type == EXPORT) | |
225 | { | |
226 | CORE_ADDR addr; | |
227 | ||
228 | /* Search forward from the current PC until we hit a branch | |
229 | or the end of the stub. */ | |
230 | for (addr = pc; addr <= u->region_end; addr += 4) | |
231 | { | |
232 | unsigned long insn; | |
233 | ||
234 | insn = read_memory_integer (addr, 4); | |
235 | ||
236 | /* Does it look like a bl? If so then it's the call path, if | |
237 | we find a bv or be first, then we're on the return path. */ | |
238 | if ((insn & 0xfc00e000) == 0xe8000000) | |
239 | return 0; | |
240 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
241 | || (insn & 0xfc000000) == 0xe0000000) | |
242 | return 1; | |
243 | } | |
244 | ||
245 | /* Should never happen. */ | |
246 | warning ("Unable to find branch in parameter relocation stub.\n"); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | /* Unknown stub type. For now, just return zero. */ | |
251 | return 0; | |
252 | ||
253 | } | |
254 | ||
255 | /* Figure out if PC is in a trampoline, and if so find out where | |
256 | the trampoline will jump to. If not in a trampoline, return zero. | |
257 | ||
258 | Simple code examination probably is not a good idea since the code | |
259 | sequences in trampolines can also appear in user code. | |
260 | ||
261 | We use unwinds and information from the minimal symbol table to | |
262 | determine when we're in a trampoline. This won't work for ELF | |
263 | (yet) since it doesn't create stub unwind entries. Whether or | |
264 | not ELF will create stub unwinds or normal unwinds for linker | |
265 | stubs is still being debated. | |
266 | ||
267 | This should handle simple calls through dyncall or sr4export, | |
268 | long calls, argument relocation stubs, and dyncall/sr4export | |
269 | calling an argument relocation stub. It even handles some stubs | |
270 | used in dynamic executables. */ | |
271 | ||
272 | static CORE_ADDR | |
273 | hppa_hpux_skip_trampoline_code (CORE_ADDR pc) | |
274 | { | |
275 | long orig_pc = pc; | |
276 | long prev_inst, curr_inst, loc; | |
abc485a1 RC |
277 | struct minimal_symbol *msym; |
278 | struct unwind_table_entry *u; | |
279 | ||
abc485a1 RC |
280 | /* Addresses passed to dyncall may *NOT* be the actual address |
281 | of the function. So we may have to do something special. */ | |
3388d7ff | 282 | if (pc == hppa_symbol_address("$$dyncall")) |
abc485a1 RC |
283 | { |
284 | pc = (CORE_ADDR) read_register (22); | |
285 | ||
286 | /* If bit 30 (counting from the left) is on, then pc is the address of | |
287 | the PLT entry for this function, not the address of the function | |
288 | itself. Bit 31 has meaning too, but only for MPE. */ | |
289 | if (pc & 0x2) | |
290 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); | |
291 | } | |
3388d7ff | 292 | if (pc == hppa_symbol_address("$$dyncall_external")) |
abc485a1 RC |
293 | { |
294 | pc = (CORE_ADDR) read_register (22); | |
295 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); | |
296 | } | |
3388d7ff | 297 | else if (pc == hppa_symbol_address("_sr4export")) |
abc485a1 RC |
298 | pc = (CORE_ADDR) (read_register (22)); |
299 | ||
300 | /* Get the unwind descriptor corresponding to PC, return zero | |
301 | if no unwind was found. */ | |
302 | u = find_unwind_entry (pc); | |
303 | if (!u) | |
304 | return 0; | |
305 | ||
306 | /* If this isn't a linker stub, then return now. */ | |
307 | /* elz: attention here! (FIXME) because of a compiler/linker | |
308 | error, some stubs which should have a non zero stub_unwind.stub_type | |
309 | have unfortunately a value of zero. So this function would return here | |
310 | as if we were not in a trampoline. To fix this, we go look at the partial | |
311 | symbol information, which reports this guy as a stub. | |
312 | (FIXME): Unfortunately, we are not that lucky: it turns out that the | |
313 | partial symbol information is also wrong sometimes. This is because | |
314 | when it is entered (somread.c::som_symtab_read()) it can happen that | |
315 | if the type of the symbol (from the som) is Entry, and the symbol is | |
316 | in a shared library, then it can also be a trampoline. This would | |
317 | be OK, except that I believe the way they decide if we are ina shared library | |
318 | does not work. SOOOO..., even if we have a regular function w/o trampolines | |
319 | its minimal symbol can be assigned type mst_solib_trampoline. | |
320 | Also, if we find that the symbol is a real stub, then we fix the unwind | |
321 | descriptor, and define the stub type to be EXPORT. | |
322 | Hopefully this is correct most of the times. */ | |
323 | if (u->stub_unwind.stub_type == 0) | |
324 | { | |
325 | ||
326 | /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed | |
327 | we can delete all the code which appears between the lines */ | |
328 | /*--------------------------------------------------------------------------*/ | |
329 | msym = lookup_minimal_symbol_by_pc (pc); | |
330 | ||
331 | if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) | |
332 | return orig_pc == pc ? 0 : pc & ~0x3; | |
333 | ||
334 | else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) | |
335 | { | |
336 | struct objfile *objfile; | |
337 | struct minimal_symbol *msymbol; | |
338 | int function_found = 0; | |
339 | ||
340 | /* go look if there is another minimal symbol with the same name as | |
341 | this one, but with type mst_text. This would happen if the msym | |
342 | is an actual trampoline, in which case there would be another | |
343 | symbol with the same name corresponding to the real function */ | |
344 | ||
345 | ALL_MSYMBOLS (objfile, msymbol) | |
346 | { | |
347 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
348 | && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol), DEPRECATED_SYMBOL_NAME (msym))) | |
349 | { | |
350 | function_found = 1; | |
351 | break; | |
352 | } | |
353 | } | |
354 | ||
355 | if (function_found) | |
356 | /* the type of msym is correct (mst_solib_trampoline), but | |
357 | the unwind info is wrong, so set it to the correct value */ | |
358 | u->stub_unwind.stub_type = EXPORT; | |
359 | else | |
360 | /* the stub type info in the unwind is correct (this is not a | |
361 | trampoline), but the msym type information is wrong, it | |
362 | should be mst_text. So we need to fix the msym, and also | |
363 | get out of this function */ | |
364 | { | |
365 | MSYMBOL_TYPE (msym) = mst_text; | |
366 | return orig_pc == pc ? 0 : pc & ~0x3; | |
367 | } | |
368 | } | |
369 | ||
370 | /*--------------------------------------------------------------------------*/ | |
371 | } | |
372 | ||
373 | /* It's a stub. Search for a branch and figure out where it goes. | |
374 | Note we have to handle multi insn branch sequences like ldil;ble. | |
375 | Most (all?) other branches can be determined by examining the contents | |
376 | of certain registers and the stack. */ | |
377 | ||
378 | loc = pc; | |
379 | curr_inst = 0; | |
380 | prev_inst = 0; | |
381 | while (1) | |
382 | { | |
383 | /* Make sure we haven't walked outside the range of this stub. */ | |
384 | if (u != find_unwind_entry (loc)) | |
385 | { | |
386 | warning ("Unable to find branch in linker stub"); | |
387 | return orig_pc == pc ? 0 : pc & ~0x3; | |
388 | } | |
389 | ||
390 | prev_inst = curr_inst; | |
391 | curr_inst = read_memory_integer (loc, 4); | |
392 | ||
393 | /* Does it look like a branch external using %r1? Then it's the | |
394 | branch from the stub to the actual function. */ | |
395 | if ((curr_inst & 0xffe0e000) == 0xe0202000) | |
396 | { | |
397 | /* Yup. See if the previous instruction loaded | |
398 | a value into %r1. If so compute and return the jump address. */ | |
399 | if ((prev_inst & 0xffe00000) == 0x20200000) | |
400 | return (hppa_extract_21 (prev_inst) + hppa_extract_17 (curr_inst)) & ~0x3; | |
401 | else | |
402 | { | |
403 | warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."); | |
404 | return orig_pc == pc ? 0 : pc & ~0x3; | |
405 | } | |
406 | } | |
407 | ||
408 | /* Does it look like a be 0(sr0,%r21)? OR | |
409 | Does it look like a be, n 0(sr0,%r21)? OR | |
410 | Does it look like a bve (r21)? (this is on PA2.0) | |
411 | Does it look like a bve, n(r21)? (this is also on PA2.0) | |
412 | That's the branch from an | |
413 | import stub to an export stub. | |
414 | ||
415 | It is impossible to determine the target of the branch via | |
416 | simple examination of instructions and/or data (consider | |
417 | that the address in the plabel may be the address of the | |
418 | bind-on-reference routine in the dynamic loader). | |
419 | ||
420 | So we have try an alternative approach. | |
421 | ||
422 | Get the name of the symbol at our current location; it should | |
423 | be a stub symbol with the same name as the symbol in the | |
424 | shared library. | |
425 | ||
426 | Then lookup a minimal symbol with the same name; we should | |
427 | get the minimal symbol for the target routine in the shared | |
428 | library as those take precedence of import/export stubs. */ | |
429 | if ((curr_inst == 0xe2a00000) || | |
430 | (curr_inst == 0xe2a00002) || | |
431 | (curr_inst == 0xeaa0d000) || | |
432 | (curr_inst == 0xeaa0d002)) | |
433 | { | |
434 | struct minimal_symbol *stubsym, *libsym; | |
435 | ||
436 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
437 | if (stubsym == NULL) | |
438 | { | |
439 | warning ("Unable to find symbol for 0x%lx", loc); | |
440 | return orig_pc == pc ? 0 : pc & ~0x3; | |
441 | } | |
442 | ||
443 | libsym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym), NULL, NULL); | |
444 | if (libsym == NULL) | |
445 | { | |
446 | warning ("Unable to find library symbol for %s\n", | |
447 | DEPRECATED_SYMBOL_NAME (stubsym)); | |
448 | return orig_pc == pc ? 0 : pc & ~0x3; | |
449 | } | |
450 | ||
451 | return SYMBOL_VALUE (libsym); | |
452 | } | |
453 | ||
454 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a | |
455 | branch from the stub to the actual function. */ | |
456 | /*elz */ | |
457 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 | |
458 | || (curr_inst & 0xffe0e000) == 0xe8000000 | |
459 | || (curr_inst & 0xffe0e000) == 0xe800A000) | |
460 | return (loc + hppa_extract_17 (curr_inst) + 8) & ~0x3; | |
461 | ||
462 | /* Does it look like bv (rp)? Note this depends on the | |
463 | current stack pointer being the same as the stack | |
464 | pointer in the stub itself! This is a branch on from the | |
465 | stub back to the original caller. */ | |
466 | /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */ | |
467 | else if ((curr_inst & 0xffe0f000) == 0xe840c000) | |
468 | { | |
469 | /* Yup. See if the previous instruction loaded | |
470 | rp from sp - 8. */ | |
471 | if (prev_inst == 0x4bc23ff1) | |
472 | return (read_memory_integer | |
473 | (read_register (HPPA_SP_REGNUM) - 8, 4)) & ~0x3; | |
474 | else | |
475 | { | |
476 | warning ("Unable to find restore of %%rp before bv (%%rp)."); | |
477 | return orig_pc == pc ? 0 : pc & ~0x3; | |
478 | } | |
479 | } | |
480 | ||
481 | /* elz: added this case to capture the new instruction | |
482 | at the end of the return part of an export stub used by | |
483 | the PA2.0: BVE, n (rp) */ | |
484 | else if ((curr_inst & 0xffe0f000) == 0xe840d000) | |
485 | { | |
486 | return (read_memory_integer | |
487 | (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; | |
488 | } | |
489 | ||
490 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
491 | the original caller from the stub. Used in dynamic executables. */ | |
492 | else if (curr_inst == 0xe0400002) | |
493 | { | |
494 | /* The value we jump to is sitting in sp - 24. But that's | |
495 | loaded several instructions before the be instruction. | |
496 | I guess we could check for the previous instruction being | |
497 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
498 | return (read_memory_integer | |
499 | (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; | |
500 | } | |
501 | ||
502 | /* Haven't found the branch yet, but we're still in the stub. | |
503 | Keep looking. */ | |
504 | loc += 4; | |
505 | } | |
506 | } | |
507 | ||
508 | ||
4c02c60c AC |
509 | /* Exception handling support for the HP-UX ANSI C++ compiler. |
510 | The compiler (aCC) provides a callback for exception events; | |
511 | GDB can set a breakpoint on this callback and find out what | |
512 | exception event has occurred. */ | |
513 | ||
514 | /* The name of the hook to be set to point to the callback function */ | |
515 | static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; | |
516 | /* The name of the function to be used to set the hook value */ | |
517 | static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; | |
518 | /* The name of the callback function in end.o */ | |
519 | static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; | |
520 | /* Name of function in end.o on which a break is set (called by above) */ | |
521 | static char HP_ACC_EH_break[] = "__d_eh_break"; | |
522 | /* Name of flag (in end.o) that enables catching throws */ | |
523 | static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; | |
524 | /* Name of flag (in end.o) that enables catching catching */ | |
525 | static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; | |
526 | /* The enum used by aCC */ | |
527 | typedef enum | |
528 | { | |
529 | __EH_NOTIFY_THROW, | |
530 | __EH_NOTIFY_CATCH | |
531 | } | |
532 | __eh_notification; | |
533 | ||
534 | /* Is exception-handling support available with this executable? */ | |
535 | static int hp_cxx_exception_support = 0; | |
536 | /* Has the initialize function been run? */ | |
90f943f1 | 537 | static int hp_cxx_exception_support_initialized = 0; |
4c02c60c AC |
538 | /* Address of __eh_notify_hook */ |
539 | static CORE_ADDR eh_notify_hook_addr = 0; | |
540 | /* Address of __d_eh_notify_callback */ | |
541 | static CORE_ADDR eh_notify_callback_addr = 0; | |
542 | /* Address of __d_eh_break */ | |
543 | static CORE_ADDR eh_break_addr = 0; | |
544 | /* Address of __d_eh_catch_catch */ | |
545 | static CORE_ADDR eh_catch_catch_addr = 0; | |
546 | /* Address of __d_eh_catch_throw */ | |
547 | static CORE_ADDR eh_catch_throw_addr = 0; | |
548 | /* Sal for __d_eh_break */ | |
549 | static struct symtab_and_line *break_callback_sal = 0; | |
550 | ||
551 | /* Code in end.c expects __d_pid to be set in the inferior, | |
552 | otherwise __d_eh_notify_callback doesn't bother to call | |
553 | __d_eh_break! So we poke the pid into this symbol | |
554 | ourselves. | |
555 | 0 => success | |
556 | 1 => failure */ | |
557 | int | |
558 | setup_d_pid_in_inferior (void) | |
559 | { | |
560 | CORE_ADDR anaddr; | |
561 | struct minimal_symbol *msymbol; | |
562 | char buf[4]; /* FIXME 32x64? */ | |
563 | ||
564 | /* Slam the pid of the process into __d_pid; failing is only a warning! */ | |
565 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
566 | if (msymbol == NULL) | |
567 | { | |
568 | warning ("Unable to find __d_pid symbol in object file."); | |
569 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
570 | return 1; | |
571 | } | |
572 | ||
573 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
574 | store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */ | |
575 | if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ | |
576 | { | |
577 | warning ("Unable to write __d_pid"); | |
578 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
579 | return 1; | |
580 | } | |
581 | return 0; | |
582 | } | |
583 | ||
584 | /* elz: Used to lookup a symbol in the shared libraries. | |
585 | This function calls shl_findsym, indirectly through a | |
586 | call to __d_shl_get. __d_shl_get is in end.c, which is always | |
587 | linked in by the hp compilers/linkers. | |
588 | The call to shl_findsym cannot be made directly because it needs | |
589 | to be active in target address space. | |
590 | inputs: - minimal symbol pointer for the function we want to look up | |
591 | - address in target space of the descriptor for the library | |
592 | where we want to look the symbol up. | |
593 | This address is retrieved using the | |
594 | som_solib_get_solib_by_pc function (somsolib.c). | |
595 | output: - real address in the library of the function. | |
596 | note: the handle can be null, in which case shl_findsym will look for | |
597 | the symbol in all the loaded shared libraries. | |
598 | files to look at if you need reference on this stuff: | |
599 | dld.c, dld_shl_findsym.c | |
600 | end.c | |
601 | man entry for shl_findsym */ | |
602 | ||
603 | CORE_ADDR | |
604 | find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle) | |
605 | { | |
606 | struct symbol *get_sym, *symbol2; | |
607 | struct minimal_symbol *buff_minsym, *msymbol; | |
608 | struct type *ftype; | |
609 | struct value **args; | |
610 | struct value *funcval; | |
611 | struct value *val; | |
612 | ||
613 | int x, namelen, err_value, tmp = -1; | |
614 | CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; | |
615 | CORE_ADDR stub_addr; | |
616 | ||
617 | ||
618 | args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */ | |
619 | funcval = find_function_in_inferior ("__d_shl_get"); | |
620 | get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_DOMAIN, NULL, NULL); | |
621 | buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL); | |
622 | msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); | |
623 | symbol2 = lookup_symbol ("__shldp", NULL, VAR_DOMAIN, NULL, NULL); | |
624 | endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); | |
625 | namelen = strlen (DEPRECATED_SYMBOL_NAME (function)); | |
626 | value_return_addr = endo_buff_addr + namelen; | |
627 | ftype = check_typedef (SYMBOL_TYPE (get_sym)); | |
628 | ||
629 | /* do alignment */ | |
630 | if ((x = value_return_addr % 64) != 0) | |
631 | value_return_addr = value_return_addr + 64 - x; | |
632 | ||
633 | errno_return_addr = value_return_addr + 64; | |
634 | ||
635 | ||
636 | /* set up stuff needed by __d_shl_get in buffer in end.o */ | |
637 | ||
638 | target_write_memory (endo_buff_addr, DEPRECATED_SYMBOL_NAME (function), namelen); | |
639 | ||
640 | target_write_memory (value_return_addr, (char *) &tmp, 4); | |
641 | ||
642 | target_write_memory (errno_return_addr, (char *) &tmp, 4); | |
643 | ||
644 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
645 | (char *) &handle, 4); | |
646 | ||
647 | /* now prepare the arguments for the call */ | |
648 | ||
649 | args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12); | |
650 | args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol)); | |
651 | args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr); | |
652 | args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE); | |
653 | args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr); | |
654 | args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr); | |
655 | ||
656 | /* now call the function */ | |
657 | ||
658 | val = call_function_by_hand (funcval, 6, args); | |
659 | ||
660 | /* now get the results */ | |
661 | ||
662 | target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value)); | |
663 | ||
664 | target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr)); | |
665 | if (stub_addr <= 0) | |
666 | error ("call to __d_shl_get failed, error code is %d", err_value); | |
667 | ||
668 | return (stub_addr); | |
669 | } | |
670 | ||
671 | /* Cover routine for find_stub_with_shl_get to pass to catch_errors */ | |
672 | static int | |
673 | cover_find_stub_with_shl_get (void *args_untyped) | |
674 | { | |
675 | args_for_find_stub *args = args_untyped; | |
676 | args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | /* Initialize exception catchpoint support by looking for the | |
681 | necessary hooks/callbacks in end.o, etc., and set the hook value to | |
682 | point to the required debug function | |
683 | ||
684 | Return 0 => failure | |
685 | 1 => success */ | |
686 | ||
687 | static int | |
688 | initialize_hp_cxx_exception_support (void) | |
689 | { | |
690 | struct symtabs_and_lines sals; | |
691 | struct cleanup *old_chain; | |
692 | struct cleanup *canonical_strings_chain = NULL; | |
693 | int i; | |
694 | char *addr_start; | |
695 | char *addr_end = NULL; | |
696 | char **canonical = (char **) NULL; | |
697 | int thread = -1; | |
698 | struct symbol *sym = NULL; | |
699 | struct minimal_symbol *msym = NULL; | |
700 | struct objfile *objfile; | |
701 | asection *shlib_info; | |
702 | ||
703 | /* Detect and disallow recursion. On HP-UX with aCC, infinite | |
704 | recursion is a possibility because finding the hook for exception | |
705 | callbacks involves making a call in the inferior, which means | |
706 | re-inserting breakpoints which can re-invoke this code */ | |
707 | ||
708 | static int recurse = 0; | |
709 | if (recurse > 0) | |
710 | { | |
711 | hp_cxx_exception_support_initialized = 0; | |
f83f82bc | 712 | deprecated_exception_support_initialized = 0; |
4c02c60c AC |
713 | return 0; |
714 | } | |
715 | ||
716 | hp_cxx_exception_support = 0; | |
717 | ||
718 | /* First check if we have seen any HP compiled objects; if not, | |
719 | it is very unlikely that HP's idiosyncratic callback mechanism | |
720 | for exception handling debug support will be available! | |
721 | This will percolate back up to breakpoint.c, where our callers | |
722 | will decide to try the g++ exception-handling support instead. */ | |
f83f82bc | 723 | if (!deprecated_hp_som_som_object_present) |
4c02c60c AC |
724 | return 0; |
725 | ||
726 | /* We have a SOM executable with SOM debug info; find the hooks */ | |
727 | ||
728 | /* First look for the notify hook provided by aCC runtime libs */ | |
729 | /* If we find this symbol, we conclude that the executable must | |
730 | have HP aCC exception support built in. If this symbol is not | |
731 | found, even though we're a HP SOM-SOM file, we may have been | |
732 | built with some other compiler (not aCC). This results percolates | |
733 | back up to our callers in breakpoint.c which can decide to | |
734 | try the g++ style of exception support instead. | |
735 | If this symbol is found but the other symbols we require are | |
736 | not found, there is something weird going on, and g++ support | |
737 | should *not* be tried as an alternative. | |
738 | ||
739 | ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. | |
740 | ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ | |
741 | ||
742 | /* libCsup has this hook; it'll usually be non-debuggable */ | |
743 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); | |
744 | if (msym) | |
745 | { | |
746 | eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); | |
747 | hp_cxx_exception_support = 1; | |
748 | } | |
749 | else | |
750 | { | |
751 | warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook); | |
752 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
753 | warning ("GDB will be unable to intercept exception events."); | |
754 | eh_notify_hook_addr = 0; | |
755 | hp_cxx_exception_support = 0; | |
756 | return 0; | |
757 | } | |
758 | ||
759 | /* Next look for the notify callback routine in end.o */ | |
760 | /* This is always available in the SOM symbol dictionary if end.o is linked in */ | |
761 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); | |
762 | if (msym) | |
763 | { | |
764 | eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); | |
765 | hp_cxx_exception_support = 1; | |
766 | } | |
767 | else | |
768 | { | |
769 | warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback); | |
770 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
771 | warning ("GDB will be unable to intercept exception events."); | |
772 | eh_notify_callback_addr = 0; | |
773 | return 0; | |
774 | } | |
775 | ||
776 | #ifndef GDB_TARGET_IS_HPPA_20W | |
777 | /* Check whether the executable is dynamically linked or archive bound */ | |
778 | /* With an archive-bound executable we can use the raw addresses we find | |
779 | for the callback function, etc. without modification. For an executable | |
780 | with shared libraries, we have to do more work to find the plabel, which | |
781 | can be the target of a call through $$dyncall from the aCC runtime support | |
782 | library (libCsup) which is linked shared by default by aCC. */ | |
783 | /* This test below was copied from somsolib.c/somread.c. It may not be a very | |
784 | reliable one to test that an executable is linked shared. pai/1997-07-18 */ | |
785 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); | |
786 | if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) | |
787 | { | |
788 | /* The minsym we have has the local code address, but that's not the | |
789 | plabel that can be used by an inter-load-module call. */ | |
790 | /* Find solib handle for main image (which has end.o), and use that | |
791 | and the min sym as arguments to __d_shl_get() (which does the equivalent | |
792 | of shl_findsym()) to find the plabel. */ | |
793 | ||
794 | args_for_find_stub args; | |
795 | static char message[] = "Error while finding exception callback hook:\n"; | |
796 | ||
797 | args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr); | |
798 | args.msym = msym; | |
799 | args.return_val = 0; | |
800 | ||
801 | recurse++; | |
802 | catch_errors (cover_find_stub_with_shl_get, &args, message, | |
803 | RETURN_MASK_ALL); | |
804 | eh_notify_callback_addr = args.return_val; | |
805 | recurse--; | |
806 | ||
f83f82bc | 807 | deprecated_exception_catchpoints_are_fragile = 1; |
4c02c60c AC |
808 | |
809 | if (!eh_notify_callback_addr) | |
810 | { | |
811 | /* We can get here either if there is no plabel in the export list | |
812 | for the main image, or if something strange happened (?) */ | |
813 | warning ("Couldn't find a plabel (indirect function label) for the exception callback."); | |
814 | warning ("GDB will not be able to intercept exception events."); | |
815 | return 0; | |
816 | } | |
817 | } | |
818 | else | |
f83f82bc | 819 | deprecated_exception_catchpoints_are_fragile = 0; |
4c02c60c AC |
820 | #endif |
821 | ||
822 | /* Now, look for the breakpointable routine in end.o */ | |
823 | /* This should also be available in the SOM symbol dict. if end.o linked in */ | |
824 | msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); | |
825 | if (msym) | |
826 | { | |
827 | eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); | |
828 | hp_cxx_exception_support = 1; | |
829 | } | |
830 | else | |
831 | { | |
832 | warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break); | |
833 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
834 | warning ("GDB will be unable to intercept exception events."); | |
835 | eh_break_addr = 0; | |
836 | return 0; | |
837 | } | |
838 | ||
839 | /* Next look for the catch enable flag provided in end.o */ | |
840 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
841 | VAR_DOMAIN, 0, (struct symtab **) NULL); | |
842 | if (sym) /* sometimes present in debug info */ | |
843 | { | |
844 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); | |
845 | hp_cxx_exception_support = 1; | |
846 | } | |
847 | else | |
848 | /* otherwise look in SOM symbol dict. */ | |
849 | { | |
850 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); | |
851 | if (msym) | |
852 | { | |
853 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); | |
854 | hp_cxx_exception_support = 1; | |
855 | } | |
856 | else | |
857 | { | |
858 | warning ("Unable to enable interception of exception catches."); | |
859 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
860 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
861 | return 0; | |
862 | } | |
863 | } | |
864 | ||
865 | /* Next look for the catch enable flag provided end.o */ | |
866 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
867 | VAR_DOMAIN, 0, (struct symtab **) NULL); | |
868 | if (sym) /* sometimes present in debug info */ | |
869 | { | |
870 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); | |
871 | hp_cxx_exception_support = 1; | |
872 | } | |
873 | else | |
874 | /* otherwise look in SOM symbol dict. */ | |
875 | { | |
876 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); | |
877 | if (msym) | |
878 | { | |
879 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); | |
880 | hp_cxx_exception_support = 1; | |
881 | } | |
882 | else | |
883 | { | |
884 | warning ("Unable to enable interception of exception throws."); | |
885 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
886 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
887 | return 0; | |
888 | } | |
889 | } | |
890 | ||
891 | /* Set the flags */ | |
892 | hp_cxx_exception_support = 2; /* everything worked so far */ | |
893 | hp_cxx_exception_support_initialized = 1; | |
f83f82bc | 894 | deprecated_exception_support_initialized = 1; |
4c02c60c AC |
895 | |
896 | return 1; | |
897 | } | |
898 | ||
899 | /* Target operation for enabling or disabling interception of | |
900 | exception events. | |
901 | KIND is either EX_EVENT_THROW or EX_EVENT_CATCH | |
902 | ENABLE is either 0 (disable) or 1 (enable). | |
903 | Return value is NULL if no support found; | |
904 | -1 if something went wrong, | |
905 | or a pointer to a symtab/line struct if the breakpointable | |
906 | address was found. */ | |
907 | ||
908 | struct symtab_and_line * | |
909 | child_enable_exception_callback (enum exception_event_kind kind, int enable) | |
910 | { | |
911 | char buf[4]; | |
912 | ||
f83f82bc AC |
913 | if (!deprecated_exception_support_initialized |
914 | || !hp_cxx_exception_support_initialized) | |
4c02c60c AC |
915 | if (!initialize_hp_cxx_exception_support ()) |
916 | return NULL; | |
917 | ||
918 | switch (hp_cxx_exception_support) | |
919 | { | |
920 | case 0: | |
921 | /* Assuming no HP support at all */ | |
922 | return NULL; | |
923 | case 1: | |
924 | /* HP support should be present, but something went wrong */ | |
925 | return (struct symtab_and_line *) -1; /* yuck! */ | |
926 | /* there may be other cases in the future */ | |
927 | } | |
928 | ||
929 | /* Set the EH hook to point to the callback routine */ | |
930 | store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ | |
931 | /* pai: (temp) FIXME should there be a pack operation first? */ | |
932 | if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ | |
933 | { | |
934 | warning ("Could not write to target memory for exception event callback."); | |
935 | warning ("Interception of exception events may not work."); | |
936 | return (struct symtab_and_line *) -1; | |
937 | } | |
938 | if (enable) | |
939 | { | |
940 | /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */ | |
941 | if (PIDGET (inferior_ptid) > 0) | |
942 | { | |
943 | if (setup_d_pid_in_inferior ()) | |
944 | return (struct symtab_and_line *) -1; | |
945 | } | |
946 | else | |
947 | { | |
948 | warning ("Internal error: Invalid inferior pid? Cannot intercept exception events."); | |
949 | return (struct symtab_and_line *) -1; | |
950 | } | |
951 | } | |
952 | ||
953 | switch (kind) | |
954 | { | |
955 | case EX_EVENT_THROW: | |
956 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
957 | if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ | |
958 | { | |
959 | warning ("Couldn't enable exception throw interception."); | |
960 | return (struct symtab_and_line *) -1; | |
961 | } | |
962 | break; | |
963 | case EX_EVENT_CATCH: | |
964 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
965 | if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ | |
966 | { | |
967 | warning ("Couldn't enable exception catch interception."); | |
968 | return (struct symtab_and_line *) -1; | |
969 | } | |
970 | break; | |
971 | default: | |
972 | error ("Request to enable unknown or unsupported exception event."); | |
973 | } | |
974 | ||
975 | /* Copy break address into new sal struct, malloc'ing if needed. */ | |
976 | if (!break_callback_sal) | |
977 | { | |
978 | break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); | |
979 | } | |
980 | init_sal (break_callback_sal); | |
981 | break_callback_sal->symtab = NULL; | |
982 | break_callback_sal->pc = eh_break_addr; | |
983 | break_callback_sal->line = 0; | |
984 | break_callback_sal->end = eh_break_addr; | |
985 | ||
986 | return break_callback_sal; | |
987 | } | |
988 | ||
989 | /* Record some information about the current exception event */ | |
990 | static struct exception_event_record current_ex_event; | |
991 | /* Convenience struct */ | |
992 | static struct symtab_and_line null_symtab_and_line = | |
993 | {NULL, 0, 0, 0}; | |
994 | ||
995 | /* Report current exception event. Returns a pointer to a record | |
996 | that describes the kind of the event, where it was thrown from, | |
997 | and where it will be caught. More information may be reported | |
998 | in the future */ | |
999 | struct exception_event_record * | |
1000 | child_get_current_exception_event (void) | |
1001 | { | |
1002 | CORE_ADDR event_kind; | |
1003 | CORE_ADDR throw_addr; | |
1004 | CORE_ADDR catch_addr; | |
1005 | struct frame_info *fi, *curr_frame; | |
1006 | int level = 1; | |
1007 | ||
1008 | curr_frame = get_current_frame (); | |
1009 | if (!curr_frame) | |
1010 | return (struct exception_event_record *) NULL; | |
1011 | ||
1012 | /* Go up one frame to __d_eh_notify_callback, because at the | |
1013 | point when this code is executed, there's garbage in the | |
1014 | arguments of __d_eh_break. */ | |
1015 | fi = find_relative_frame (curr_frame, &level); | |
1016 | if (level != 0) | |
1017 | return (struct exception_event_record *) NULL; | |
1018 | ||
1019 | select_frame (fi); | |
1020 | ||
1021 | /* Read in the arguments */ | |
1022 | /* __d_eh_notify_callback() is called with 3 arguments: | |
1023 | 1. event kind catch or throw | |
1024 | 2. the target address if known | |
1025 | 3. a flag -- not sure what this is. pai/1997-07-17 */ | |
34f75cc1 RC |
1026 | event_kind = read_register (HPPA_ARG0_REGNUM); |
1027 | catch_addr = read_register (HPPA_ARG1_REGNUM); | |
4c02c60c AC |
1028 | |
1029 | /* Now go down to a user frame */ | |
1030 | /* For a throw, __d_eh_break is called by | |
1031 | __d_eh_notify_callback which is called by | |
1032 | __notify_throw which is called | |
1033 | from user code. | |
1034 | For a catch, __d_eh_break is called by | |
1035 | __d_eh_notify_callback which is called by | |
1036 | <stackwalking stuff> which is called by | |
1037 | __throw__<stuff> or __rethrow_<stuff> which is called | |
1038 | from user code. */ | |
1039 | /* FIXME: Don't use such magic numbers; search for the frames */ | |
1040 | level = (event_kind == EX_EVENT_THROW) ? 3 : 4; | |
1041 | fi = find_relative_frame (curr_frame, &level); | |
1042 | if (level != 0) | |
1043 | return (struct exception_event_record *) NULL; | |
1044 | ||
1045 | select_frame (fi); | |
1046 | throw_addr = get_frame_pc (fi); | |
1047 | ||
1048 | /* Go back to original (top) frame */ | |
1049 | select_frame (curr_frame); | |
1050 | ||
1051 | current_ex_event.kind = (enum exception_event_kind) event_kind; | |
1052 | current_ex_event.throw_sal = find_pc_line (throw_addr, 1); | |
1053 | current_ex_event.catch_sal = find_pc_line (catch_addr, 1); | |
1054 | ||
1055 | return ¤t_ex_event; | |
1056 | } | |
1057 | ||
43613416 RC |
1058 | /* Signal frames. */ |
1059 | struct hppa_hpux_sigtramp_unwind_cache | |
1060 | { | |
1061 | CORE_ADDR base; | |
1062 | struct trad_frame_saved_reg *saved_regs; | |
1063 | }; | |
1064 | ||
1065 | static int hppa_hpux_tramp_reg[] = { | |
1066 | HPPA_SAR_REGNUM, | |
1067 | HPPA_PCOQ_HEAD_REGNUM, | |
1068 | HPPA_PCSQ_HEAD_REGNUM, | |
1069 | HPPA_PCOQ_TAIL_REGNUM, | |
1070 | HPPA_PCSQ_TAIL_REGNUM, | |
1071 | HPPA_EIEM_REGNUM, | |
1072 | HPPA_IIR_REGNUM, | |
1073 | HPPA_ISR_REGNUM, | |
1074 | HPPA_IOR_REGNUM, | |
1075 | HPPA_IPSW_REGNUM, | |
1076 | -1, | |
1077 | HPPA_SR4_REGNUM, | |
1078 | HPPA_SR4_REGNUM + 1, | |
1079 | HPPA_SR4_REGNUM + 2, | |
1080 | HPPA_SR4_REGNUM + 3, | |
1081 | HPPA_SR4_REGNUM + 4, | |
1082 | HPPA_SR4_REGNUM + 5, | |
1083 | HPPA_SR4_REGNUM + 6, | |
1084 | HPPA_SR4_REGNUM + 7, | |
1085 | HPPA_RCR_REGNUM, | |
1086 | HPPA_PID0_REGNUM, | |
1087 | HPPA_PID1_REGNUM, | |
1088 | HPPA_CCR_REGNUM, | |
1089 | HPPA_PID2_REGNUM, | |
1090 | HPPA_PID3_REGNUM, | |
1091 | HPPA_TR0_REGNUM, | |
1092 | HPPA_TR0_REGNUM + 1, | |
1093 | HPPA_TR0_REGNUM + 2, | |
1094 | HPPA_CR27_REGNUM | |
1095 | }; | |
1096 | ||
1097 | static struct hppa_hpux_sigtramp_unwind_cache * | |
1098 | hppa_hpux_sigtramp_frame_unwind_cache (struct frame_info *next_frame, | |
1099 | void **this_cache) | |
1100 | ||
1101 | { | |
1102 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
1103 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1104 | struct hppa_hpux_sigtramp_unwind_cache *info; | |
1105 | unsigned int flag; | |
1106 | CORE_ADDR sp, scptr; | |
1107 | int i, incr, off, szoff; | |
1108 | ||
1109 | if (*this_cache) | |
1110 | return *this_cache; | |
1111 | ||
1112 | info = FRAME_OBSTACK_ZALLOC (struct hppa_hpux_sigtramp_unwind_cache); | |
1113 | *this_cache = info; | |
1114 | info->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
1115 | ||
1116 | sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); | |
1117 | ||
1118 | scptr = sp - 1352; | |
1119 | off = scptr; | |
1120 | ||
1121 | /* See /usr/include/machine/save_state.h for the structure of the save_state_t | |
1122 | structure. */ | |
1123 | ||
1124 | flag = read_memory_unsigned_integer(scptr, 4); | |
1125 | ||
1126 | if (!(flag & 0x40)) | |
1127 | { | |
1128 | /* Narrow registers. */ | |
1129 | off = scptr + offsetof (save_state_t, ss_narrow); | |
1130 | incr = 4; | |
1131 | szoff = 0; | |
1132 | } | |
1133 | else | |
1134 | { | |
1135 | /* Wide registers. */ | |
1136 | off = scptr + offsetof (save_state_t, ss_wide) + 8; | |
1137 | incr = 8; | |
1138 | szoff = (tdep->bytes_per_address == 4 ? 4 : 0); | |
1139 | } | |
1140 | ||
1141 | for (i = 1; i < 32; i++) | |
1142 | { | |
1143 | info->saved_regs[HPPA_R0_REGNUM + i].addr = off + szoff; | |
1144 | off += incr; | |
1145 | } | |
1146 | ||
1147 | for (i = 0; | |
1148 | i < sizeof(hppa_hpux_tramp_reg) / sizeof(hppa_hpux_tramp_reg[0]); | |
1149 | i++) | |
1150 | { | |
1151 | if (hppa_hpux_tramp_reg[i] > 0) | |
1152 | info->saved_regs[hppa_hpux_tramp_reg[i]].addr = off + szoff; | |
1153 | off += incr; | |
1154 | } | |
1155 | ||
1156 | /* TODO: fp regs */ | |
1157 | ||
1158 | info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); | |
1159 | ||
1160 | return info; | |
1161 | } | |
1162 | ||
1163 | static void | |
1164 | hppa_hpux_sigtramp_frame_this_id (struct frame_info *next_frame, | |
1165 | void **this_prologue_cache, | |
1166 | struct frame_id *this_id) | |
1167 | { | |
1168 | struct hppa_hpux_sigtramp_unwind_cache *info | |
1169 | = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
1170 | *this_id = frame_id_build (info->base, frame_pc_unwind (next_frame)); | |
1171 | } | |
1172 | ||
1173 | static void | |
1174 | hppa_hpux_sigtramp_frame_prev_register (struct frame_info *next_frame, | |
1175 | void **this_prologue_cache, | |
1176 | int regnum, int *optimizedp, | |
1177 | enum lval_type *lvalp, | |
1178 | CORE_ADDR *addrp, | |
1179 | int *realnump, void *valuep) | |
1180 | { | |
1181 | struct hppa_hpux_sigtramp_unwind_cache *info | |
1182 | = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
1183 | hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum, | |
1184 | optimizedp, lvalp, addrp, realnump, valuep); | |
1185 | } | |
1186 | ||
1187 | static const struct frame_unwind hppa_hpux_sigtramp_frame_unwind = { | |
1188 | SIGTRAMP_FRAME, | |
1189 | hppa_hpux_sigtramp_frame_this_id, | |
1190 | hppa_hpux_sigtramp_frame_prev_register | |
1191 | }; | |
1192 | ||
1193 | static const struct frame_unwind * | |
1194 | hppa_hpux_sigtramp_unwind_sniffer (struct frame_info *next_frame) | |
1195 | { | |
1196 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
1197 | char *name; | |
1198 | ||
1199 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1200 | ||
1201 | if (name && strcmp(name, "_sigreturn") == 0) | |
1202 | return &hppa_hpux_sigtramp_frame_unwind; | |
1203 | ||
1204 | return NULL; | |
1205 | } | |
1206 | ||
c268433a RC |
1207 | static CORE_ADDR |
1208 | hppa_hpux_som_find_global_pointer (struct value *function) | |
1209 | { | |
1210 | CORE_ADDR faddr; | |
1211 | ||
1212 | faddr = value_as_address (function); | |
1213 | ||
1214 | /* Is this a plabel? If so, dereference it to get the gp value. */ | |
1215 | if (faddr & 2) | |
1216 | { | |
1217 | int status; | |
1218 | char buf[4]; | |
1219 | ||
1220 | faddr &= ~3; | |
1221 | ||
1222 | status = target_read_memory (faddr + 4, buf, sizeof (buf)); | |
1223 | if (status == 0) | |
1224 | return extract_unsigned_integer (buf, sizeof (buf)); | |
1225 | } | |
1226 | ||
1227 | return som_solib_get_got_by_pc (faddr); | |
1228 | } | |
1229 | ||
1230 | static CORE_ADDR | |
1231 | hppa_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, | |
1232 | CORE_ADDR funcaddr, int using_gcc, | |
1233 | struct value **args, int nargs, | |
1234 | struct type *value_type, | |
1235 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
1236 | { | |
1237 | /* FIXME: tausq/2004-06-09: This needs much more testing. It is broken | |
1238 | for pa64, but we should be able to get it to work with a little bit | |
1239 | of work. gdb-6.1 has a lot of code to handle various cases; I've tried to | |
1240 | simplify it and avoid compile-time conditionals. */ | |
1241 | ||
1242 | /* On HPUX, functions in the main executable and in libraries can be located | |
1243 | in different spaces. In order for us to be able to select the right | |
1244 | space for the function call, we need to go through an instruction seqeunce | |
1245 | to select the right space for the target function, call it, and then | |
1246 | restore the space on return. | |
1247 | ||
1248 | There are two helper routines that can be used for this task -- if | |
1249 | an application is linked with gcc, it will contain a __gcc_plt_call | |
1250 | helper function. __gcc_plt_call, when passed the entry point of an | |
1251 | import stub, will do the necessary space setting/restoration for the | |
1252 | target function. | |
1253 | ||
1254 | For programs that are compiled/linked with the HP compiler, a similar | |
1255 | function called __d_plt_call exists; __d_plt_call expects a PLABEL instead | |
1256 | of an import stub as an argument. | |
1257 | ||
080228b2 | 1258 | // *INDENT-OFF* |
c268433a RC |
1259 | To summarize, the call flow is: |
1260 | current function -> dummy frame -> __gcc_plt_call (import stub) | |
1261 | -> target function | |
1262 | or | |
1263 | current function -> dummy frame -> __d_plt_call (plabel) | |
1264 | -> target function | |
080228b2 | 1265 | // *INDENT-ON* |
c268433a RC |
1266 | |
1267 | In general the "funcaddr" argument passed to push_dummy_code is the actual | |
1268 | entry point of the target function. For __gcc_plt_call, we need to | |
1269 | locate the import stub for the corresponding function. Failing that, | |
1270 | we construct a dummy "import stub" on the stack to pass as an argument. | |
1271 | For __d_plt_call, we similarly synthesize a PLABEL on the stack to | |
1272 | pass to the helper function. | |
1273 | ||
1274 | An additional twist is that, in order for us to restore the space register | |
1275 | to its starting state, we need __gcc_plt_call/__d_plt_call to return | |
1276 | to the instruction where we started the call. However, if we put | |
1277 | the breakpoint there, gdb will complain because it will find two | |
1278 | frames on the stack with the same (sp, pc) (with the dummy frame in | |
1279 | between). Currently, we set the return pointer to (pc - 4) of the | |
1280 | current function. FIXME: This is not an ideal solution; possibly if the | |
1281 | current pc is at the beginning of a page, this will cause a page fault. | |
1282 | Need to understand this better and figure out a better way to fix it. */ | |
1283 | ||
1284 | struct minimal_symbol *sym; | |
1285 | ||
1286 | /* Nonzero if we will use GCC's PLT call routine. This routine must be | |
1287 | passed an import stub, not a PLABEL. It is also necessary to get %r19 | |
1288 | before performing the call. (This is done by push_dummy_call.) */ | |
1289 | int use_gcc_plt_call = 1; | |
1290 | ||
1291 | /* See if __gcc_plt_call is available; if not we will use the HP version | |
1292 | instead. */ | |
1293 | sym = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL); | |
1294 | if (sym == NULL) | |
1295 | use_gcc_plt_call = 0; | |
1296 | ||
1297 | /* If using __gcc_plt_call, we need to make sure we pass in an import | |
1298 | stub. funcaddr can be pointing to an export stub or a real function, | |
1299 | so we try to resolve it to the import stub. */ | |
1300 | if (use_gcc_plt_call) | |
1301 | { | |
1302 | struct objfile *objfile; | |
1303 | struct minimal_symbol *funsym, *stubsym; | |
1304 | CORE_ADDR stubaddr = 0; | |
1305 | ||
1306 | funsym = lookup_minimal_symbol_by_pc (funcaddr); | |
1307 | if (!funsym) | |
1308 | error ("Unable to find symbol for target function.\n"); | |
1309 | ||
1310 | ALL_OBJFILES (objfile) | |
1311 | { | |
1312 | stubsym = lookup_minimal_symbol_solib_trampoline | |
1313 | (SYMBOL_LINKAGE_NAME (funsym), objfile); | |
1314 | ||
1315 | if (stubsym) | |
1316 | { | |
1317 | struct unwind_table_entry *u; | |
1318 | ||
1319 | u = find_unwind_entry (SYMBOL_VALUE (stubsym)); | |
1320 | if (u == NULL | |
1321 | || (u->stub_unwind.stub_type != IMPORT | |
1322 | && u->stub_unwind.stub_type != IMPORT_SHLIB)) | |
1323 | continue; | |
1324 | ||
1325 | stubaddr = SYMBOL_VALUE (stubsym); | |
1326 | ||
1327 | /* If we found an IMPORT stub, then we can stop searching; | |
1328 | if we found an IMPORT_SHLIB, we want to continue the search | |
1329 | in the hopes that we will find an IMPORT stub. */ | |
1330 | if (u->stub_unwind.stub_type == IMPORT) | |
1331 | break; | |
1332 | } | |
1333 | } | |
1334 | ||
1335 | if (stubaddr != 0) | |
1336 | { | |
1337 | /* Argument to __gcc_plt_call is passed in r22. */ | |
1338 | regcache_cooked_write_unsigned (current_regcache, 22, stubaddr); | |
1339 | } | |
1340 | else | |
1341 | { | |
1342 | /* No import stub found; let's synthesize one. */ | |
1343 | ||
1344 | /* ldsid %r21, %r1 */ | |
1345 | write_memory_unsigned_integer (sp, 4, 0x02a010a1); | |
1346 | /* mtsp %r1,%sr0 */ | |
1347 | write_memory_unsigned_integer (sp + 4, 4, 0x00011820); | |
1348 | /* be 0(%sr0, %r21) */ | |
1349 | write_memory_unsigned_integer (sp + 8, 4, 0xe2a00000); | |
1350 | /* nop */ | |
1351 | write_memory_unsigned_integer (sp + 12, 4, 0x08000240); | |
1352 | ||
1353 | regcache_cooked_write_unsigned (current_regcache, 21, funcaddr); | |
1354 | regcache_cooked_write_unsigned (current_regcache, 22, sp); | |
1355 | } | |
1356 | ||
1357 | /* We set the breakpoint address and r31 to (close to) where the current | |
1358 | pc is; when __gcc_plt_call returns, it will restore pcsqh to the | |
1359 | current value based on this. The -4 is needed for frame unwinding | |
1360 | to work properly -- we need to land in a different function than | |
1361 | the current function. */ | |
1362 | *bp_addr = (read_register (HPPA_PCOQ_HEAD_REGNUM) & ~3) - 4; | |
1363 | regcache_cooked_write_unsigned (current_regcache, 31, *bp_addr); | |
1364 | ||
1365 | /* Continue from __gcc_plt_call. */ | |
1366 | *real_pc = SYMBOL_VALUE (sym); | |
1367 | } | |
1368 | else | |
1369 | { | |
1370 | unsigned int gp; | |
1371 | ||
1372 | /* Use __d_plt_call as a fallback; __d_plt_call expects to be called | |
1373 | with a plabel, so we need to build one. */ | |
1374 | ||
1375 | sym = lookup_minimal_symbol ("__d_plt_call", NULL, NULL); | |
1376 | if (sym == NULL) | |
1377 | error("Can't find an address for __d_plt_call or __gcc_plt_call " | |
1378 | "trampoline\nSuggest linking executable with -g or compiling " | |
1379 | "with gcc."); | |
1380 | ||
1381 | gp = gdbarch_tdep (gdbarch)->find_global_pointer (funcaddr); | |
1382 | write_memory_unsigned_integer (sp, 4, funcaddr); | |
1383 | write_memory_unsigned_integer (sp + 4, 4, gp); | |
1384 | ||
1385 | /* plabel is passed in r22 */ | |
1386 | regcache_cooked_write_unsigned (current_regcache, 22, sp); | |
1387 | } | |
1388 | ||
1389 | /* Pushed one stack frame, which has to be 64-byte aligned. */ | |
1390 | sp += 64; | |
1391 | ||
1392 | return sp; | |
1393 | } | |
1394 | ||
90f943f1 RC |
1395 | static void |
1396 | hppa_hpux_inferior_created (struct target_ops *objfile, int from_tty) | |
1397 | { | |
1398 | /* Some HP-UX related globals to clear when a new "main" | |
1399 | symbol file is loaded. HP-specific. */ | |
1400 | deprecated_hp_som_som_object_present = 0; | |
1401 | hp_cxx_exception_support_initialized = 0; | |
1402 | } | |
1403 | ||
7d773d96 JB |
1404 | static void |
1405 | hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1406 | { | |
abc485a1 RC |
1407 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1408 | ||
abc485a1 RC |
1409 | if (tdep->bytes_per_address == 4) |
1410 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
1411 | hppa32_hpux_in_solib_call_trampoline); | |
1412 | else | |
1413 | set_gdbarch_in_solib_call_trampoline (gdbarch, | |
1414 | hppa64_hpux_in_solib_call_trampoline); | |
1415 | ||
1416 | set_gdbarch_in_solib_return_trampoline (gdbarch, | |
1417 | hppa_hpux_in_solib_return_trampoline); | |
1418 | set_gdbarch_skip_trampoline_code (gdbarch, hppa_hpux_skip_trampoline_code); | |
43613416 | 1419 | |
c268433a RC |
1420 | set_gdbarch_push_dummy_code (gdbarch, hppa_hpux_push_dummy_code); |
1421 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); | |
1422 | ||
43613416 | 1423 | frame_unwind_append_sniffer (gdbarch, hppa_hpux_sigtramp_unwind_sniffer); |
90f943f1 RC |
1424 | |
1425 | observer_attach_inferior_created (hppa_hpux_inferior_created); | |
7d773d96 | 1426 | } |
60e1ff27 | 1427 | |
273f8429 JB |
1428 | static void |
1429 | hppa_hpux_som_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1430 | { | |
fdd72f95 RC |
1431 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1432 | ||
1433 | tdep->is_elf = 0; | |
c268433a RC |
1434 | |
1435 | tdep->find_global_pointer = hppa_hpux_som_find_global_pointer; | |
7d773d96 | 1436 | hppa_hpux_init_abi (info, gdbarch); |
273f8429 JB |
1437 | } |
1438 | ||
1439 | static void | |
1440 | hppa_hpux_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1441 | { | |
fdd72f95 RC |
1442 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1443 | ||
1444 | tdep->is_elf = 1; | |
7d773d96 | 1445 | hppa_hpux_init_abi (info, gdbarch); |
273f8429 JB |
1446 | } |
1447 | ||
1448 | void | |
1449 | _initialize_hppa_hpux_tdep (void) | |
1450 | { | |
05816f70 | 1451 | gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_HPUX_SOM, |
273f8429 | 1452 | hppa_hpux_som_init_abi); |
51db5742 | 1453 | gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_HPUX_ELF, |
273f8429 JB |
1454 | hppa_hpux_elf_init_abi); |
1455 | } |