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b1acf338 | 1 | /* Target-dependent code for HP-UX on PA-RISC. |
ef6e7e13 | 2 | |
b1acf338 | 3 | Copyright 2002, 2003, 2004 Free Software Foundation, Inc. |
273f8429 | 4 | |
b1acf338 | 5 | This file is part of GDB. |
273f8429 | 6 | |
b1acf338 MK |
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. | |
273f8429 | 11 | |
b1acf338 MK |
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. | |
273f8429 | 16 | |
b1acf338 MK |
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, | |
20 | Boston, MA 02111-1307, USA. */ | |
273f8429 JB |
21 | |
22 | #include "defs.h" | |
23 | #include "arch-utils.h" | |
60e1ff27 | 24 | #include "gdbcore.h" |
273f8429 | 25 | #include "osabi.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" |
08d53055 MK |
34 | #include "regset.h" |
35 | ||
36 | #include "gdb_string.h" | |
4c02c60c AC |
37 | |
38 | #include <dl.h> | |
39 | #include <machine/save_state.h> | |
273f8429 | 40 | |
08d53055 MK |
41 | #include "hppa-tdep.h" |
42 | ||
43613416 RC |
43 | #ifndef offsetof |
44 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
45 | #endif | |
46 | ||
273f8429 JB |
47 | /* Forward declarations. */ |
48 | extern void _initialize_hppa_hpux_tdep (void); | |
49 | extern initialize_file_ftype _initialize_hppa_hpux_tdep; | |
50 | ||
4c02c60c AC |
51 | typedef struct |
52 | { | |
53 | struct minimal_symbol *msym; | |
54 | CORE_ADDR solib_handle; | |
55 | CORE_ADDR return_val; | |
56 | } | |
57 | args_for_find_stub; | |
58 | ||
abc485a1 RC |
59 | /* Return one if PC is in the call path of a trampoline, else return zero. |
60 | ||
61 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
62 | just shared library trampolines (import, export). */ | |
63 | ||
64 | static int | |
65 | hppa32_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
66 | { | |
67 | struct minimal_symbol *minsym; | |
68 | struct unwind_table_entry *u; | |
abc485a1 RC |
69 | |
70 | /* First see if PC is in one of the two C-library trampolines. */ | |
3388d7ff RC |
71 | if (pc == hppa_symbol_address("$$dyncall") |
72 | || pc == hppa_symbol_address("_sr4export")) | |
abc485a1 RC |
73 | return 1; |
74 | ||
75 | minsym = lookup_minimal_symbol_by_pc (pc); | |
76 | if (minsym && strcmp (DEPRECATED_SYMBOL_NAME (minsym), ".stub") == 0) | |
77 | return 1; | |
78 | ||
79 | /* Get the unwind descriptor corresponding to PC, return zero | |
80 | if no unwind was found. */ | |
81 | u = find_unwind_entry (pc); | |
82 | if (!u) | |
83 | return 0; | |
84 | ||
85 | /* If this isn't a linker stub, then return now. */ | |
86 | if (u->stub_unwind.stub_type == 0) | |
87 | return 0; | |
88 | ||
89 | /* By definition a long-branch stub is a call stub. */ | |
90 | if (u->stub_unwind.stub_type == LONG_BRANCH) | |
91 | return 1; | |
92 | ||
93 | /* The call and return path execute the same instructions within | |
94 | an IMPORT stub! So an IMPORT stub is both a call and return | |
95 | trampoline. */ | |
96 | if (u->stub_unwind.stub_type == IMPORT) | |
97 | return 1; | |
98 | ||
99 | /* Parameter relocation stubs always have a call path and may have a | |
100 | return path. */ | |
101 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
102 | || u->stub_unwind.stub_type == EXPORT) | |
103 | { | |
104 | CORE_ADDR addr; | |
105 | ||
106 | /* Search forward from the current PC until we hit a branch | |
107 | or the end of the stub. */ | |
108 | for (addr = pc; addr <= u->region_end; addr += 4) | |
109 | { | |
110 | unsigned long insn; | |
111 | ||
112 | insn = read_memory_integer (addr, 4); | |
113 | ||
114 | /* Does it look like a bl? If so then it's the call path, if | |
115 | we find a bv or be first, then we're on the return path. */ | |
116 | if ((insn & 0xfc00e000) == 0xe8000000) | |
117 | return 1; | |
118 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
119 | || (insn & 0xfc000000) == 0xe0000000) | |
120 | return 0; | |
121 | } | |
122 | ||
123 | /* Should never happen. */ | |
124 | warning ("Unable to find branch in parameter relocation stub.\n"); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* Unknown stub type. For now, just return zero. */ | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static int | |
133 | hppa64_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
134 | { | |
135 | /* PA64 has a completely different stub/trampoline scheme. Is it | |
136 | better? Maybe. It's certainly harder to determine with any | |
137 | certainty that we are in a stub because we can not refer to the | |
138 | unwinders to help. | |
139 | ||
140 | The heuristic is simple. Try to lookup the current PC value in th | |
141 | minimal symbol table. If that fails, then assume we are not in a | |
142 | stub and return. | |
143 | ||
144 | Then see if the PC value falls within the section bounds for the | |
145 | section containing the minimal symbol we found in the first | |
146 | step. If it does, then assume we are not in a stub and return. | |
147 | ||
148 | Finally peek at the instructions to see if they look like a stub. */ | |
149 | struct minimal_symbol *minsym; | |
150 | asection *sec; | |
151 | CORE_ADDR addr; | |
152 | int insn, i; | |
153 | ||
154 | minsym = lookup_minimal_symbol_by_pc (pc); | |
155 | if (! minsym) | |
156 | return 0; | |
157 | ||
158 | sec = SYMBOL_BFD_SECTION (minsym); | |
159 | ||
160 | if (bfd_get_section_vma (sec->owner, sec) <= pc | |
161 | && pc < (bfd_get_section_vma (sec->owner, sec) | |
162 | + bfd_section_size (sec->owner, sec))) | |
163 | return 0; | |
164 | ||
165 | /* We might be in a stub. Peek at the instructions. Stubs are 3 | |
166 | instructions long. */ | |
167 | insn = read_memory_integer (pc, 4); | |
168 | ||
169 | /* Find out where we think we are within the stub. */ | |
170 | if ((insn & 0xffffc00e) == 0x53610000) | |
171 | addr = pc; | |
172 | else if ((insn & 0xffffffff) == 0xe820d000) | |
173 | addr = pc - 4; | |
174 | else if ((insn & 0xffffc00e) == 0x537b0000) | |
175 | addr = pc - 8; | |
176 | else | |
177 | return 0; | |
178 | ||
179 | /* Now verify each insn in the range looks like a stub instruction. */ | |
180 | insn = read_memory_integer (addr, 4); | |
181 | if ((insn & 0xffffc00e) != 0x53610000) | |
182 | return 0; | |
183 | ||
184 | /* Now verify each insn in the range looks like a stub instruction. */ | |
185 | insn = read_memory_integer (addr + 4, 4); | |
186 | if ((insn & 0xffffffff) != 0xe820d000) | |
187 | return 0; | |
188 | ||
189 | /* Now verify each insn in the range looks like a stub instruction. */ | |
190 | insn = read_memory_integer (addr + 8, 4); | |
191 | if ((insn & 0xffffc00e) != 0x537b0000) | |
192 | return 0; | |
193 | ||
194 | /* Looks like a stub. */ | |
195 | return 1; | |
196 | } | |
197 | ||
198 | /* Return one if PC is in the return path of a trampoline, else return zero. | |
199 | ||
200 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
201 | just shared library trampolines (import, export). */ | |
202 | ||
203 | static int | |
204 | hppa_hpux_in_solib_return_trampoline (CORE_ADDR pc, char *name) | |
205 | { | |
206 | struct unwind_table_entry *u; | |
207 | ||
208 | /* Get the unwind descriptor corresponding to PC, return zero | |
209 | if no unwind was found. */ | |
210 | u = find_unwind_entry (pc); | |
211 | if (!u) | |
212 | return 0; | |
213 | ||
214 | /* If this isn't a linker stub or it's just a long branch stub, then | |
215 | return zero. */ | |
216 | if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) | |
217 | return 0; | |
218 | ||
219 | /* The call and return path execute the same instructions within | |
220 | an IMPORT stub! So an IMPORT stub is both a call and return | |
221 | trampoline. */ | |
222 | if (u->stub_unwind.stub_type == IMPORT) | |
223 | return 1; | |
224 | ||
225 | /* Parameter relocation stubs always have a call path and may have a | |
226 | return path. */ | |
227 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
228 | || u->stub_unwind.stub_type == EXPORT) | |
229 | { | |
230 | CORE_ADDR addr; | |
231 | ||
232 | /* Search forward from the current PC until we hit a branch | |
233 | or the end of the stub. */ | |
234 | for (addr = pc; addr <= u->region_end; addr += 4) | |
235 | { | |
236 | unsigned long insn; | |
237 | ||
238 | insn = read_memory_integer (addr, 4); | |
239 | ||
240 | /* Does it look like a bl? If so then it's the call path, if | |
241 | we find a bv or be first, then we're on the return path. */ | |
242 | if ((insn & 0xfc00e000) == 0xe8000000) | |
243 | return 0; | |
244 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
245 | || (insn & 0xfc000000) == 0xe0000000) | |
246 | return 1; | |
247 | } | |
248 | ||
249 | /* Should never happen. */ | |
250 | warning ("Unable to find branch in parameter relocation stub.\n"); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | /* Unknown stub type. For now, just return zero. */ | |
255 | return 0; | |
256 | ||
257 | } | |
258 | ||
259 | /* Figure out if PC is in a trampoline, and if so find out where | |
260 | the trampoline will jump to. If not in a trampoline, return zero. | |
261 | ||
262 | Simple code examination probably is not a good idea since the code | |
263 | sequences in trampolines can also appear in user code. | |
264 | ||
265 | We use unwinds and information from the minimal symbol table to | |
266 | determine when we're in a trampoline. This won't work for ELF | |
267 | (yet) since it doesn't create stub unwind entries. Whether or | |
268 | not ELF will create stub unwinds or normal unwinds for linker | |
269 | stubs is still being debated. | |
270 | ||
271 | This should handle simple calls through dyncall or sr4export, | |
272 | long calls, argument relocation stubs, and dyncall/sr4export | |
273 | calling an argument relocation stub. It even handles some stubs | |
274 | used in dynamic executables. */ | |
275 | ||
276 | static CORE_ADDR | |
277 | hppa_hpux_skip_trampoline_code (CORE_ADDR pc) | |
278 | { | |
279 | long orig_pc = pc; | |
280 | long prev_inst, curr_inst, loc; | |
abc485a1 RC |
281 | struct minimal_symbol *msym; |
282 | struct unwind_table_entry *u; | |
283 | ||
abc485a1 RC |
284 | /* Addresses passed to dyncall may *NOT* be the actual address |
285 | of the function. So we may have to do something special. */ | |
3388d7ff | 286 | if (pc == hppa_symbol_address("$$dyncall")) |
abc485a1 RC |
287 | { |
288 | pc = (CORE_ADDR) read_register (22); | |
289 | ||
290 | /* If bit 30 (counting from the left) is on, then pc is the address of | |
291 | the PLT entry for this function, not the address of the function | |
292 | itself. Bit 31 has meaning too, but only for MPE. */ | |
293 | if (pc & 0x2) | |
294 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); | |
295 | } | |
3388d7ff | 296 | if (pc == hppa_symbol_address("$$dyncall_external")) |
abc485a1 RC |
297 | { |
298 | pc = (CORE_ADDR) read_register (22); | |
299 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8); | |
300 | } | |
3388d7ff | 301 | else if (pc == hppa_symbol_address("_sr4export")) |
abc485a1 RC |
302 | pc = (CORE_ADDR) (read_register (22)); |
303 | ||
304 | /* Get the unwind descriptor corresponding to PC, return zero | |
305 | if no unwind was found. */ | |
306 | u = find_unwind_entry (pc); | |
307 | if (!u) | |
308 | return 0; | |
309 | ||
310 | /* If this isn't a linker stub, then return now. */ | |
311 | /* elz: attention here! (FIXME) because of a compiler/linker | |
312 | error, some stubs which should have a non zero stub_unwind.stub_type | |
313 | have unfortunately a value of zero. So this function would return here | |
314 | as if we were not in a trampoline. To fix this, we go look at the partial | |
315 | symbol information, which reports this guy as a stub. | |
316 | (FIXME): Unfortunately, we are not that lucky: it turns out that the | |
317 | partial symbol information is also wrong sometimes. This is because | |
318 | when it is entered (somread.c::som_symtab_read()) it can happen that | |
319 | if the type of the symbol (from the som) is Entry, and the symbol is | |
320 | in a shared library, then it can also be a trampoline. This would | |
321 | be OK, except that I believe the way they decide if we are ina shared library | |
322 | does not work. SOOOO..., even if we have a regular function w/o trampolines | |
323 | its minimal symbol can be assigned type mst_solib_trampoline. | |
324 | Also, if we find that the symbol is a real stub, then we fix the unwind | |
325 | descriptor, and define the stub type to be EXPORT. | |
326 | Hopefully this is correct most of the times. */ | |
327 | if (u->stub_unwind.stub_type == 0) | |
328 | { | |
329 | ||
330 | /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed | |
331 | we can delete all the code which appears between the lines */ | |
332 | /*--------------------------------------------------------------------------*/ | |
333 | msym = lookup_minimal_symbol_by_pc (pc); | |
334 | ||
335 | if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) | |
336 | return orig_pc == pc ? 0 : pc & ~0x3; | |
337 | ||
338 | else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) | |
339 | { | |
340 | struct objfile *objfile; | |
341 | struct minimal_symbol *msymbol; | |
342 | int function_found = 0; | |
343 | ||
344 | /* go look if there is another minimal symbol with the same name as | |
345 | this one, but with type mst_text. This would happen if the msym | |
346 | is an actual trampoline, in which case there would be another | |
347 | symbol with the same name corresponding to the real function */ | |
348 | ||
349 | ALL_MSYMBOLS (objfile, msymbol) | |
350 | { | |
351 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
352 | && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol), DEPRECATED_SYMBOL_NAME (msym))) | |
353 | { | |
354 | function_found = 1; | |
355 | break; | |
356 | } | |
357 | } | |
358 | ||
359 | if (function_found) | |
360 | /* the type of msym is correct (mst_solib_trampoline), but | |
361 | the unwind info is wrong, so set it to the correct value */ | |
362 | u->stub_unwind.stub_type = EXPORT; | |
363 | else | |
364 | /* the stub type info in the unwind is correct (this is not a | |
365 | trampoline), but the msym type information is wrong, it | |
366 | should be mst_text. So we need to fix the msym, and also | |
367 | get out of this function */ | |
368 | { | |
369 | MSYMBOL_TYPE (msym) = mst_text; | |
370 | return orig_pc == pc ? 0 : pc & ~0x3; | |
371 | } | |
372 | } | |
373 | ||
374 | /*--------------------------------------------------------------------------*/ | |
375 | } | |
376 | ||
377 | /* It's a stub. Search for a branch and figure out where it goes. | |
378 | Note we have to handle multi insn branch sequences like ldil;ble. | |
379 | Most (all?) other branches can be determined by examining the contents | |
380 | of certain registers and the stack. */ | |
381 | ||
382 | loc = pc; | |
383 | curr_inst = 0; | |
384 | prev_inst = 0; | |
385 | while (1) | |
386 | { | |
387 | /* Make sure we haven't walked outside the range of this stub. */ | |
388 | if (u != find_unwind_entry (loc)) | |
389 | { | |
390 | warning ("Unable to find branch in linker stub"); | |
391 | return orig_pc == pc ? 0 : pc & ~0x3; | |
392 | } | |
393 | ||
394 | prev_inst = curr_inst; | |
395 | curr_inst = read_memory_integer (loc, 4); | |
396 | ||
397 | /* Does it look like a branch external using %r1? Then it's the | |
398 | branch from the stub to the actual function. */ | |
399 | if ((curr_inst & 0xffe0e000) == 0xe0202000) | |
400 | { | |
401 | /* Yup. See if the previous instruction loaded | |
402 | a value into %r1. If so compute and return the jump address. */ | |
403 | if ((prev_inst & 0xffe00000) == 0x20200000) | |
404 | return (hppa_extract_21 (prev_inst) + hppa_extract_17 (curr_inst)) & ~0x3; | |
405 | else | |
406 | { | |
407 | warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."); | |
408 | return orig_pc == pc ? 0 : pc & ~0x3; | |
409 | } | |
410 | } | |
411 | ||
412 | /* Does it look like a be 0(sr0,%r21)? OR | |
413 | Does it look like a be, n 0(sr0,%r21)? OR | |
414 | Does it look like a bve (r21)? (this is on PA2.0) | |
415 | Does it look like a bve, n(r21)? (this is also on PA2.0) | |
416 | That's the branch from an | |
417 | import stub to an export stub. | |
418 | ||
419 | It is impossible to determine the target of the branch via | |
420 | simple examination of instructions and/or data (consider | |
421 | that the address in the plabel may be the address of the | |
422 | bind-on-reference routine in the dynamic loader). | |
423 | ||
424 | So we have try an alternative approach. | |
425 | ||
426 | Get the name of the symbol at our current location; it should | |
427 | be a stub symbol with the same name as the symbol in the | |
428 | shared library. | |
429 | ||
430 | Then lookup a minimal symbol with the same name; we should | |
431 | get the minimal symbol for the target routine in the shared | |
432 | library as those take precedence of import/export stubs. */ | |
433 | if ((curr_inst == 0xe2a00000) || | |
434 | (curr_inst == 0xe2a00002) || | |
435 | (curr_inst == 0xeaa0d000) || | |
436 | (curr_inst == 0xeaa0d002)) | |
437 | { | |
438 | struct minimal_symbol *stubsym, *libsym; | |
439 | ||
440 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
441 | if (stubsym == NULL) | |
442 | { | |
443 | warning ("Unable to find symbol for 0x%lx", loc); | |
444 | return orig_pc == pc ? 0 : pc & ~0x3; | |
445 | } | |
446 | ||
447 | libsym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym), NULL, NULL); | |
448 | if (libsym == NULL) | |
449 | { | |
450 | warning ("Unable to find library symbol for %s\n", | |
451 | DEPRECATED_SYMBOL_NAME (stubsym)); | |
452 | return orig_pc == pc ? 0 : pc & ~0x3; | |
453 | } | |
454 | ||
455 | return SYMBOL_VALUE (libsym); | |
456 | } | |
457 | ||
458 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a | |
459 | branch from the stub to the actual function. */ | |
460 | /*elz */ | |
461 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 | |
462 | || (curr_inst & 0xffe0e000) == 0xe8000000 | |
463 | || (curr_inst & 0xffe0e000) == 0xe800A000) | |
464 | return (loc + hppa_extract_17 (curr_inst) + 8) & ~0x3; | |
465 | ||
466 | /* Does it look like bv (rp)? Note this depends on the | |
467 | current stack pointer being the same as the stack | |
468 | pointer in the stub itself! This is a branch on from the | |
469 | stub back to the original caller. */ | |
470 | /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */ | |
471 | else if ((curr_inst & 0xffe0f000) == 0xe840c000) | |
472 | { | |
473 | /* Yup. See if the previous instruction loaded | |
474 | rp from sp - 8. */ | |
475 | if (prev_inst == 0x4bc23ff1) | |
476 | return (read_memory_integer | |
477 | (read_register (HPPA_SP_REGNUM) - 8, 4)) & ~0x3; | |
478 | else | |
479 | { | |
480 | warning ("Unable to find restore of %%rp before bv (%%rp)."); | |
481 | return orig_pc == pc ? 0 : pc & ~0x3; | |
482 | } | |
483 | } | |
484 | ||
485 | /* elz: added this case to capture the new instruction | |
486 | at the end of the return part of an export stub used by | |
487 | the PA2.0: BVE, n (rp) */ | |
488 | else if ((curr_inst & 0xffe0f000) == 0xe840d000) | |
489 | { | |
490 | return (read_memory_integer | |
491 | (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; | |
492 | } | |
493 | ||
494 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
495 | the original caller from the stub. Used in dynamic executables. */ | |
496 | else if (curr_inst == 0xe0400002) | |
497 | { | |
498 | /* The value we jump to is sitting in sp - 24. But that's | |
499 | loaded several instructions before the be instruction. | |
500 | I guess we could check for the previous instruction being | |
501 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
502 | return (read_memory_integer | |
503 | (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3; | |
504 | } | |
505 | ||
506 | /* Haven't found the branch yet, but we're still in the stub. | |
507 | Keep looking. */ | |
508 | loc += 4; | |
509 | } | |
510 | } | |
511 | ||
5aac166f RC |
512 | void |
513 | hppa_skip_permanent_breakpoint (void) | |
514 | { | |
515 | /* To step over a breakpoint instruction on the PA takes some | |
516 | fiddling with the instruction address queue. | |
517 | ||
518 | When we stop at a breakpoint, the IA queue front (the instruction | |
519 | we're executing now) points at the breakpoint instruction, and | |
520 | the IA queue back (the next instruction to execute) points to | |
521 | whatever instruction we would execute after the breakpoint, if it | |
522 | were an ordinary instruction. This is the case even if the | |
523 | breakpoint is in the delay slot of a branch instruction. | |
524 | ||
525 | Clearly, to step past the breakpoint, we need to set the queue | |
526 | front to the back. But what do we put in the back? What | |
527 | instruction comes after that one? Because of the branch delay | |
528 | slot, the next insn is always at the back + 4. */ | |
529 | write_register (HPPA_PCOQ_HEAD_REGNUM, read_register (HPPA_PCOQ_TAIL_REGNUM)); | |
530 | write_register (HPPA_PCSQ_HEAD_REGNUM, read_register (HPPA_PCSQ_TAIL_REGNUM)); | |
531 | ||
532 | write_register (HPPA_PCOQ_TAIL_REGNUM, read_register (HPPA_PCOQ_TAIL_REGNUM) + 4); | |
533 | /* We can leave the tail's space the same, since there's no jump. */ | |
534 | } | |
abc485a1 | 535 | |
4c02c60c AC |
536 | /* Exception handling support for the HP-UX ANSI C++ compiler. |
537 | The compiler (aCC) provides a callback for exception events; | |
538 | GDB can set a breakpoint on this callback and find out what | |
539 | exception event has occurred. */ | |
540 | ||
541 | /* The name of the hook to be set to point to the callback function */ | |
542 | static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook"; | |
543 | /* The name of the function to be used to set the hook value */ | |
544 | static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value"; | |
545 | /* The name of the callback function in end.o */ | |
546 | static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback"; | |
547 | /* Name of function in end.o on which a break is set (called by above) */ | |
548 | static char HP_ACC_EH_break[] = "__d_eh_break"; | |
549 | /* Name of flag (in end.o) that enables catching throws */ | |
550 | static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw"; | |
551 | /* Name of flag (in end.o) that enables catching catching */ | |
552 | static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch"; | |
553 | /* The enum used by aCC */ | |
554 | typedef enum | |
555 | { | |
556 | __EH_NOTIFY_THROW, | |
557 | __EH_NOTIFY_CATCH | |
558 | } | |
559 | __eh_notification; | |
560 | ||
561 | /* Is exception-handling support available with this executable? */ | |
562 | static int hp_cxx_exception_support = 0; | |
563 | /* Has the initialize function been run? */ | |
90f943f1 | 564 | static int hp_cxx_exception_support_initialized = 0; |
4c02c60c AC |
565 | /* Address of __eh_notify_hook */ |
566 | static CORE_ADDR eh_notify_hook_addr = 0; | |
567 | /* Address of __d_eh_notify_callback */ | |
568 | static CORE_ADDR eh_notify_callback_addr = 0; | |
569 | /* Address of __d_eh_break */ | |
570 | static CORE_ADDR eh_break_addr = 0; | |
571 | /* Address of __d_eh_catch_catch */ | |
572 | static CORE_ADDR eh_catch_catch_addr = 0; | |
573 | /* Address of __d_eh_catch_throw */ | |
574 | static CORE_ADDR eh_catch_throw_addr = 0; | |
575 | /* Sal for __d_eh_break */ | |
576 | static struct symtab_and_line *break_callback_sal = 0; | |
577 | ||
578 | /* Code in end.c expects __d_pid to be set in the inferior, | |
579 | otherwise __d_eh_notify_callback doesn't bother to call | |
580 | __d_eh_break! So we poke the pid into this symbol | |
581 | ourselves. | |
582 | 0 => success | |
583 | 1 => failure */ | |
584 | int | |
585 | setup_d_pid_in_inferior (void) | |
586 | { | |
587 | CORE_ADDR anaddr; | |
588 | struct minimal_symbol *msymbol; | |
589 | char buf[4]; /* FIXME 32x64? */ | |
590 | ||
591 | /* Slam the pid of the process into __d_pid; failing is only a warning! */ | |
592 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); | |
593 | if (msymbol == NULL) | |
594 | { | |
595 | warning ("Unable to find __d_pid symbol in object file."); | |
596 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
597 | return 1; | |
598 | } | |
599 | ||
600 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); | |
601 | store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */ | |
602 | if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */ | |
603 | { | |
604 | warning ("Unable to write __d_pid"); | |
605 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
606 | return 1; | |
607 | } | |
608 | return 0; | |
609 | } | |
610 | ||
611 | /* elz: Used to lookup a symbol in the shared libraries. | |
612 | This function calls shl_findsym, indirectly through a | |
613 | call to __d_shl_get. __d_shl_get is in end.c, which is always | |
614 | linked in by the hp compilers/linkers. | |
615 | The call to shl_findsym cannot be made directly because it needs | |
616 | to be active in target address space. | |
617 | inputs: - minimal symbol pointer for the function we want to look up | |
618 | - address in target space of the descriptor for the library | |
619 | where we want to look the symbol up. | |
620 | This address is retrieved using the | |
621 | som_solib_get_solib_by_pc function (somsolib.c). | |
622 | output: - real address in the library of the function. | |
623 | note: the handle can be null, in which case shl_findsym will look for | |
624 | the symbol in all the loaded shared libraries. | |
625 | files to look at if you need reference on this stuff: | |
626 | dld.c, dld_shl_findsym.c | |
627 | end.c | |
628 | man entry for shl_findsym */ | |
629 | ||
630 | CORE_ADDR | |
631 | find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle) | |
632 | { | |
633 | struct symbol *get_sym, *symbol2; | |
634 | struct minimal_symbol *buff_minsym, *msymbol; | |
635 | struct type *ftype; | |
636 | struct value **args; | |
637 | struct value *funcval; | |
638 | struct value *val; | |
639 | ||
640 | int x, namelen, err_value, tmp = -1; | |
641 | CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr; | |
642 | CORE_ADDR stub_addr; | |
643 | ||
644 | ||
645 | args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */ | |
646 | funcval = find_function_in_inferior ("__d_shl_get"); | |
647 | get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_DOMAIN, NULL, NULL); | |
648 | buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL); | |
649 | msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL); | |
650 | symbol2 = lookup_symbol ("__shldp", NULL, VAR_DOMAIN, NULL, NULL); | |
651 | endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym); | |
652 | namelen = strlen (DEPRECATED_SYMBOL_NAME (function)); | |
653 | value_return_addr = endo_buff_addr + namelen; | |
654 | ftype = check_typedef (SYMBOL_TYPE (get_sym)); | |
655 | ||
656 | /* do alignment */ | |
657 | if ((x = value_return_addr % 64) != 0) | |
658 | value_return_addr = value_return_addr + 64 - x; | |
659 | ||
660 | errno_return_addr = value_return_addr + 64; | |
661 | ||
662 | ||
663 | /* set up stuff needed by __d_shl_get in buffer in end.o */ | |
664 | ||
665 | target_write_memory (endo_buff_addr, DEPRECATED_SYMBOL_NAME (function), namelen); | |
666 | ||
667 | target_write_memory (value_return_addr, (char *) &tmp, 4); | |
668 | ||
669 | target_write_memory (errno_return_addr, (char *) &tmp, 4); | |
670 | ||
671 | target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), | |
672 | (char *) &handle, 4); | |
673 | ||
674 | /* now prepare the arguments for the call */ | |
675 | ||
676 | args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12); | |
677 | args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol)); | |
678 | args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr); | |
679 | args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE); | |
680 | args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr); | |
681 | args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr); | |
682 | ||
683 | /* now call the function */ | |
684 | ||
685 | val = call_function_by_hand (funcval, 6, args); | |
686 | ||
687 | /* now get the results */ | |
688 | ||
689 | target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value)); | |
690 | ||
691 | target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr)); | |
692 | if (stub_addr <= 0) | |
693 | error ("call to __d_shl_get failed, error code is %d", err_value); | |
694 | ||
695 | return (stub_addr); | |
696 | } | |
697 | ||
698 | /* Cover routine for find_stub_with_shl_get to pass to catch_errors */ | |
699 | static int | |
700 | cover_find_stub_with_shl_get (void *args_untyped) | |
701 | { | |
702 | args_for_find_stub *args = args_untyped; | |
703 | args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | /* Initialize exception catchpoint support by looking for the | |
708 | necessary hooks/callbacks in end.o, etc., and set the hook value to | |
709 | point to the required debug function | |
710 | ||
711 | Return 0 => failure | |
712 | 1 => success */ | |
713 | ||
714 | static int | |
715 | initialize_hp_cxx_exception_support (void) | |
716 | { | |
717 | struct symtabs_and_lines sals; | |
718 | struct cleanup *old_chain; | |
719 | struct cleanup *canonical_strings_chain = NULL; | |
720 | int i; | |
721 | char *addr_start; | |
722 | char *addr_end = NULL; | |
723 | char **canonical = (char **) NULL; | |
724 | int thread = -1; | |
725 | struct symbol *sym = NULL; | |
726 | struct minimal_symbol *msym = NULL; | |
727 | struct objfile *objfile; | |
728 | asection *shlib_info; | |
729 | ||
730 | /* Detect and disallow recursion. On HP-UX with aCC, infinite | |
731 | recursion is a possibility because finding the hook for exception | |
732 | callbacks involves making a call in the inferior, which means | |
733 | re-inserting breakpoints which can re-invoke this code */ | |
734 | ||
735 | static int recurse = 0; | |
736 | if (recurse > 0) | |
737 | { | |
738 | hp_cxx_exception_support_initialized = 0; | |
f83f82bc | 739 | deprecated_exception_support_initialized = 0; |
4c02c60c AC |
740 | return 0; |
741 | } | |
742 | ||
743 | hp_cxx_exception_support = 0; | |
744 | ||
745 | /* First check if we have seen any HP compiled objects; if not, | |
746 | it is very unlikely that HP's idiosyncratic callback mechanism | |
747 | for exception handling debug support will be available! | |
748 | This will percolate back up to breakpoint.c, where our callers | |
749 | will decide to try the g++ exception-handling support instead. */ | |
f83f82bc | 750 | if (!deprecated_hp_som_som_object_present) |
4c02c60c AC |
751 | return 0; |
752 | ||
753 | /* We have a SOM executable with SOM debug info; find the hooks */ | |
754 | ||
755 | /* First look for the notify hook provided by aCC runtime libs */ | |
756 | /* If we find this symbol, we conclude that the executable must | |
757 | have HP aCC exception support built in. If this symbol is not | |
758 | found, even though we're a HP SOM-SOM file, we may have been | |
759 | built with some other compiler (not aCC). This results percolates | |
760 | back up to our callers in breakpoint.c which can decide to | |
761 | try the g++ style of exception support instead. | |
762 | If this symbol is found but the other symbols we require are | |
763 | not found, there is something weird going on, and g++ support | |
764 | should *not* be tried as an alternative. | |
765 | ||
766 | ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined. | |
767 | ASSUMPTION: HP aCC and g++ modules cannot be linked together. */ | |
768 | ||
769 | /* libCsup has this hook; it'll usually be non-debuggable */ | |
770 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL); | |
771 | if (msym) | |
772 | { | |
773 | eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym); | |
774 | hp_cxx_exception_support = 1; | |
775 | } | |
776 | else | |
777 | { | |
778 | warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook); | |
779 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
780 | warning ("GDB will be unable to intercept exception events."); | |
781 | eh_notify_hook_addr = 0; | |
782 | hp_cxx_exception_support = 0; | |
783 | return 0; | |
784 | } | |
785 | ||
786 | /* Next look for the notify callback routine in end.o */ | |
787 | /* This is always available in the SOM symbol dictionary if end.o is linked in */ | |
788 | msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL); | |
789 | if (msym) | |
790 | { | |
791 | eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym); | |
792 | hp_cxx_exception_support = 1; | |
793 | } | |
794 | else | |
795 | { | |
796 | warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback); | |
797 | warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o)."); | |
798 | warning ("GDB will be unable to intercept exception events."); | |
799 | eh_notify_callback_addr = 0; | |
800 | return 0; | |
801 | } | |
802 | ||
803 | #ifndef GDB_TARGET_IS_HPPA_20W | |
804 | /* Check whether the executable is dynamically linked or archive bound */ | |
805 | /* With an archive-bound executable we can use the raw addresses we find | |
806 | for the callback function, etc. without modification. For an executable | |
807 | with shared libraries, we have to do more work to find the plabel, which | |
808 | can be the target of a call through $$dyncall from the aCC runtime support | |
809 | library (libCsup) which is linked shared by default by aCC. */ | |
810 | /* This test below was copied from somsolib.c/somread.c. It may not be a very | |
811 | reliable one to test that an executable is linked shared. pai/1997-07-18 */ | |
812 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); | |
813 | if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0)) | |
814 | { | |
815 | /* The minsym we have has the local code address, but that's not the | |
816 | plabel that can be used by an inter-load-module call. */ | |
817 | /* Find solib handle for main image (which has end.o), and use that | |
818 | and the min sym as arguments to __d_shl_get() (which does the equivalent | |
819 | of shl_findsym()) to find the plabel. */ | |
820 | ||
821 | args_for_find_stub args; | |
822 | static char message[] = "Error while finding exception callback hook:\n"; | |
823 | ||
824 | args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr); | |
825 | args.msym = msym; | |
826 | args.return_val = 0; | |
827 | ||
828 | recurse++; | |
829 | catch_errors (cover_find_stub_with_shl_get, &args, message, | |
830 | RETURN_MASK_ALL); | |
831 | eh_notify_callback_addr = args.return_val; | |
832 | recurse--; | |
833 | ||
f83f82bc | 834 | deprecated_exception_catchpoints_are_fragile = 1; |
4c02c60c AC |
835 | |
836 | if (!eh_notify_callback_addr) | |
837 | { | |
838 | /* We can get here either if there is no plabel in the export list | |
839 | for the main image, or if something strange happened (?) */ | |
840 | warning ("Couldn't find a plabel (indirect function label) for the exception callback."); | |
841 | warning ("GDB will not be able to intercept exception events."); | |
842 | return 0; | |
843 | } | |
844 | } | |
845 | else | |
f83f82bc | 846 | deprecated_exception_catchpoints_are_fragile = 0; |
4c02c60c AC |
847 | #endif |
848 | ||
849 | /* Now, look for the breakpointable routine in end.o */ | |
850 | /* This should also be available in the SOM symbol dict. if end.o linked in */ | |
851 | msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL); | |
852 | if (msym) | |
853 | { | |
854 | eh_break_addr = SYMBOL_VALUE_ADDRESS (msym); | |
855 | hp_cxx_exception_support = 1; | |
856 | } | |
857 | else | |
858 | { | |
859 | warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break); | |
860 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
861 | warning ("GDB will be unable to intercept exception events."); | |
862 | eh_break_addr = 0; | |
863 | return 0; | |
864 | } | |
865 | ||
866 | /* Next look for the catch enable flag provided in end.o */ | |
867 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
868 | VAR_DOMAIN, 0, (struct symtab **) NULL); | |
869 | if (sym) /* sometimes present in debug info */ | |
870 | { | |
871 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym); | |
872 | hp_cxx_exception_support = 1; | |
873 | } | |
874 | else | |
875 | /* otherwise look in SOM symbol dict. */ | |
876 | { | |
877 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL); | |
878 | if (msym) | |
879 | { | |
880 | eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym); | |
881 | hp_cxx_exception_support = 1; | |
882 | } | |
883 | else | |
884 | { | |
885 | warning ("Unable to enable interception of exception catches."); | |
886 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
887 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
888 | return 0; | |
889 | } | |
890 | } | |
891 | ||
892 | /* Next look for the catch enable flag provided end.o */ | |
893 | sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL, | |
894 | VAR_DOMAIN, 0, (struct symtab **) NULL); | |
895 | if (sym) /* sometimes present in debug info */ | |
896 | { | |
897 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym); | |
898 | hp_cxx_exception_support = 1; | |
899 | } | |
900 | else | |
901 | /* otherwise look in SOM symbol dict. */ | |
902 | { | |
903 | msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL); | |
904 | if (msym) | |
905 | { | |
906 | eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym); | |
907 | hp_cxx_exception_support = 1; | |
908 | } | |
909 | else | |
910 | { | |
911 | warning ("Unable to enable interception of exception throws."); | |
912 | warning ("Executable may not have been compiled debuggable with HP aCC."); | |
913 | warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o)."); | |
914 | return 0; | |
915 | } | |
916 | } | |
917 | ||
918 | /* Set the flags */ | |
919 | hp_cxx_exception_support = 2; /* everything worked so far */ | |
920 | hp_cxx_exception_support_initialized = 1; | |
f83f82bc | 921 | deprecated_exception_support_initialized = 1; |
4c02c60c AC |
922 | |
923 | return 1; | |
924 | } | |
925 | ||
926 | /* Target operation for enabling or disabling interception of | |
927 | exception events. | |
928 | KIND is either EX_EVENT_THROW or EX_EVENT_CATCH | |
929 | ENABLE is either 0 (disable) or 1 (enable). | |
930 | Return value is NULL if no support found; | |
931 | -1 if something went wrong, | |
932 | or a pointer to a symtab/line struct if the breakpointable | |
933 | address was found. */ | |
934 | ||
935 | struct symtab_and_line * | |
936 | child_enable_exception_callback (enum exception_event_kind kind, int enable) | |
937 | { | |
938 | char buf[4]; | |
939 | ||
f83f82bc AC |
940 | if (!deprecated_exception_support_initialized |
941 | || !hp_cxx_exception_support_initialized) | |
4c02c60c AC |
942 | if (!initialize_hp_cxx_exception_support ()) |
943 | return NULL; | |
944 | ||
945 | switch (hp_cxx_exception_support) | |
946 | { | |
947 | case 0: | |
948 | /* Assuming no HP support at all */ | |
949 | return NULL; | |
950 | case 1: | |
951 | /* HP support should be present, but something went wrong */ | |
952 | return (struct symtab_and_line *) -1; /* yuck! */ | |
953 | /* there may be other cases in the future */ | |
954 | } | |
955 | ||
956 | /* Set the EH hook to point to the callback routine */ | |
957 | store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */ | |
958 | /* pai: (temp) FIXME should there be a pack operation first? */ | |
959 | if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */ | |
960 | { | |
961 | warning ("Could not write to target memory for exception event callback."); | |
962 | warning ("Interception of exception events may not work."); | |
963 | return (struct symtab_and_line *) -1; | |
964 | } | |
965 | if (enable) | |
966 | { | |
967 | /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */ | |
968 | if (PIDGET (inferior_ptid) > 0) | |
969 | { | |
970 | if (setup_d_pid_in_inferior ()) | |
971 | return (struct symtab_and_line *) -1; | |
972 | } | |
973 | else | |
974 | { | |
975 | warning ("Internal error: Invalid inferior pid? Cannot intercept exception events."); | |
976 | return (struct symtab_and_line *) -1; | |
977 | } | |
978 | } | |
979 | ||
980 | switch (kind) | |
981 | { | |
982 | case EX_EVENT_THROW: | |
983 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
984 | if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */ | |
985 | { | |
986 | warning ("Couldn't enable exception throw interception."); | |
987 | return (struct symtab_and_line *) -1; | |
988 | } | |
989 | break; | |
990 | case EX_EVENT_CATCH: | |
991 | store_unsigned_integer (buf, 4, enable ? 1 : 0); | |
992 | if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */ | |
993 | { | |
994 | warning ("Couldn't enable exception catch interception."); | |
995 | return (struct symtab_and_line *) -1; | |
996 | } | |
997 | break; | |
998 | default: | |
999 | error ("Request to enable unknown or unsupported exception event."); | |
1000 | } | |
1001 | ||
3cd36e7c | 1002 | /* Copy break address into new sal struct, malloc'ing if needed. */ |
4c02c60c | 1003 | if (!break_callback_sal) |
3cd36e7c | 1004 | break_callback_sal = XMALLOC (struct symtab_and_line); |
4c02c60c AC |
1005 | init_sal (break_callback_sal); |
1006 | break_callback_sal->symtab = NULL; | |
1007 | break_callback_sal->pc = eh_break_addr; | |
1008 | break_callback_sal->line = 0; | |
1009 | break_callback_sal->end = eh_break_addr; | |
1010 | ||
1011 | return break_callback_sal; | |
1012 | } | |
1013 | ||
1014 | /* Record some information about the current exception event */ | |
1015 | static struct exception_event_record current_ex_event; | |
1016 | /* Convenience struct */ | |
1017 | static struct symtab_and_line null_symtab_and_line = | |
1018 | {NULL, 0, 0, 0}; | |
1019 | ||
1020 | /* Report current exception event. Returns a pointer to a record | |
1021 | that describes the kind of the event, where it was thrown from, | |
1022 | and where it will be caught. More information may be reported | |
1023 | in the future */ | |
1024 | struct exception_event_record * | |
1025 | child_get_current_exception_event (void) | |
1026 | { | |
1027 | CORE_ADDR event_kind; | |
1028 | CORE_ADDR throw_addr; | |
1029 | CORE_ADDR catch_addr; | |
1030 | struct frame_info *fi, *curr_frame; | |
1031 | int level = 1; | |
1032 | ||
1033 | curr_frame = get_current_frame (); | |
1034 | if (!curr_frame) | |
1035 | return (struct exception_event_record *) NULL; | |
1036 | ||
1037 | /* Go up one frame to __d_eh_notify_callback, because at the | |
1038 | point when this code is executed, there's garbage in the | |
1039 | arguments of __d_eh_break. */ | |
1040 | fi = find_relative_frame (curr_frame, &level); | |
1041 | if (level != 0) | |
1042 | return (struct exception_event_record *) NULL; | |
1043 | ||
1044 | select_frame (fi); | |
1045 | ||
1046 | /* Read in the arguments */ | |
1047 | /* __d_eh_notify_callback() is called with 3 arguments: | |
1048 | 1. event kind catch or throw | |
1049 | 2. the target address if known | |
1050 | 3. a flag -- not sure what this is. pai/1997-07-17 */ | |
34f75cc1 RC |
1051 | event_kind = read_register (HPPA_ARG0_REGNUM); |
1052 | catch_addr = read_register (HPPA_ARG1_REGNUM); | |
4c02c60c AC |
1053 | |
1054 | /* Now go down to a user frame */ | |
1055 | /* For a throw, __d_eh_break is called by | |
1056 | __d_eh_notify_callback which is called by | |
1057 | __notify_throw which is called | |
1058 | from user code. | |
1059 | For a catch, __d_eh_break is called by | |
1060 | __d_eh_notify_callback which is called by | |
1061 | <stackwalking stuff> which is called by | |
1062 | __throw__<stuff> or __rethrow_<stuff> which is called | |
1063 | from user code. */ | |
1064 | /* FIXME: Don't use such magic numbers; search for the frames */ | |
1065 | level = (event_kind == EX_EVENT_THROW) ? 3 : 4; | |
1066 | fi = find_relative_frame (curr_frame, &level); | |
1067 | if (level != 0) | |
1068 | return (struct exception_event_record *) NULL; | |
1069 | ||
1070 | select_frame (fi); | |
1071 | throw_addr = get_frame_pc (fi); | |
1072 | ||
1073 | /* Go back to original (top) frame */ | |
1074 | select_frame (curr_frame); | |
1075 | ||
1076 | current_ex_event.kind = (enum exception_event_kind) event_kind; | |
1077 | current_ex_event.throw_sal = find_pc_line (throw_addr, 1); | |
1078 | current_ex_event.catch_sal = find_pc_line (catch_addr, 1); | |
1079 | ||
1080 | return ¤t_ex_event; | |
1081 | } | |
1082 | ||
43613416 RC |
1083 | /* Signal frames. */ |
1084 | struct hppa_hpux_sigtramp_unwind_cache | |
1085 | { | |
1086 | CORE_ADDR base; | |
1087 | struct trad_frame_saved_reg *saved_regs; | |
1088 | }; | |
1089 | ||
1090 | static int hppa_hpux_tramp_reg[] = { | |
1091 | HPPA_SAR_REGNUM, | |
1092 | HPPA_PCOQ_HEAD_REGNUM, | |
1093 | HPPA_PCSQ_HEAD_REGNUM, | |
1094 | HPPA_PCOQ_TAIL_REGNUM, | |
1095 | HPPA_PCSQ_TAIL_REGNUM, | |
1096 | HPPA_EIEM_REGNUM, | |
1097 | HPPA_IIR_REGNUM, | |
1098 | HPPA_ISR_REGNUM, | |
1099 | HPPA_IOR_REGNUM, | |
1100 | HPPA_IPSW_REGNUM, | |
1101 | -1, | |
1102 | HPPA_SR4_REGNUM, | |
1103 | HPPA_SR4_REGNUM + 1, | |
1104 | HPPA_SR4_REGNUM + 2, | |
1105 | HPPA_SR4_REGNUM + 3, | |
1106 | HPPA_SR4_REGNUM + 4, | |
1107 | HPPA_SR4_REGNUM + 5, | |
1108 | HPPA_SR4_REGNUM + 6, | |
1109 | HPPA_SR4_REGNUM + 7, | |
1110 | HPPA_RCR_REGNUM, | |
1111 | HPPA_PID0_REGNUM, | |
1112 | HPPA_PID1_REGNUM, | |
1113 | HPPA_CCR_REGNUM, | |
1114 | HPPA_PID2_REGNUM, | |
1115 | HPPA_PID3_REGNUM, | |
1116 | HPPA_TR0_REGNUM, | |
1117 | HPPA_TR0_REGNUM + 1, | |
1118 | HPPA_TR0_REGNUM + 2, | |
1119 | HPPA_CR27_REGNUM | |
1120 | }; | |
1121 | ||
1122 | static struct hppa_hpux_sigtramp_unwind_cache * | |
1123 | hppa_hpux_sigtramp_frame_unwind_cache (struct frame_info *next_frame, | |
1124 | void **this_cache) | |
1125 | ||
1126 | { | |
1127 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
1128 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1129 | struct hppa_hpux_sigtramp_unwind_cache *info; | |
1130 | unsigned int flag; | |
1131 | CORE_ADDR sp, scptr; | |
1132 | int i, incr, off, szoff; | |
1133 | ||
1134 | if (*this_cache) | |
1135 | return *this_cache; | |
1136 | ||
1137 | info = FRAME_OBSTACK_ZALLOC (struct hppa_hpux_sigtramp_unwind_cache); | |
1138 | *this_cache = info; | |
1139 | info->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
1140 | ||
1141 | sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); | |
1142 | ||
1143 | scptr = sp - 1352; | |
1144 | off = scptr; | |
1145 | ||
1146 | /* See /usr/include/machine/save_state.h for the structure of the save_state_t | |
1147 | structure. */ | |
1148 | ||
1149 | flag = read_memory_unsigned_integer(scptr, 4); | |
1150 | ||
1151 | if (!(flag & 0x40)) | |
1152 | { | |
1153 | /* Narrow registers. */ | |
1154 | off = scptr + offsetof (save_state_t, ss_narrow); | |
1155 | incr = 4; | |
1156 | szoff = 0; | |
1157 | } | |
1158 | else | |
1159 | { | |
1160 | /* Wide registers. */ | |
1161 | off = scptr + offsetof (save_state_t, ss_wide) + 8; | |
1162 | incr = 8; | |
1163 | szoff = (tdep->bytes_per_address == 4 ? 4 : 0); | |
1164 | } | |
1165 | ||
1166 | for (i = 1; i < 32; i++) | |
1167 | { | |
1168 | info->saved_regs[HPPA_R0_REGNUM + i].addr = off + szoff; | |
1169 | off += incr; | |
1170 | } | |
1171 | ||
01926a69 | 1172 | for (i = 0; i < ARRAY_SIZE (hppa_hpux_tramp_reg); i++) |
43613416 RC |
1173 | { |
1174 | if (hppa_hpux_tramp_reg[i] > 0) | |
1175 | info->saved_regs[hppa_hpux_tramp_reg[i]].addr = off + szoff; | |
1176 | off += incr; | |
1177 | } | |
1178 | ||
1179 | /* TODO: fp regs */ | |
1180 | ||
1181 | info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM); | |
1182 | ||
1183 | return info; | |
1184 | } | |
1185 | ||
1186 | static void | |
1187 | hppa_hpux_sigtramp_frame_this_id (struct frame_info *next_frame, | |
1188 | void **this_prologue_cache, | |
1189 | struct frame_id *this_id) | |
1190 | { | |
1191 | struct hppa_hpux_sigtramp_unwind_cache *info | |
1192 | = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
1193 | *this_id = frame_id_build (info->base, frame_pc_unwind (next_frame)); | |
1194 | } | |
1195 | ||
1196 | static void | |
1197 | hppa_hpux_sigtramp_frame_prev_register (struct frame_info *next_frame, | |
1198 | void **this_prologue_cache, | |
1199 | int regnum, int *optimizedp, | |
1200 | enum lval_type *lvalp, | |
1201 | CORE_ADDR *addrp, | |
1202 | int *realnump, void *valuep) | |
1203 | { | |
1204 | struct hppa_hpux_sigtramp_unwind_cache *info | |
1205 | = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache); | |
1206 | hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum, | |
1207 | optimizedp, lvalp, addrp, realnump, valuep); | |
1208 | } | |
1209 | ||
1210 | static const struct frame_unwind hppa_hpux_sigtramp_frame_unwind = { | |
1211 | SIGTRAMP_FRAME, | |
1212 | hppa_hpux_sigtramp_frame_this_id, | |
1213 | hppa_hpux_sigtramp_frame_prev_register | |
1214 | }; | |
1215 | ||
1216 | static const struct frame_unwind * | |
1217 | hppa_hpux_sigtramp_unwind_sniffer (struct frame_info *next_frame) | |
1218 | { | |
1219 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
1220 | char *name; | |
1221 | ||
1222 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1223 | ||
1224 | if (name && strcmp(name, "_sigreturn") == 0) | |
1225 | return &hppa_hpux_sigtramp_frame_unwind; | |
1226 | ||
1227 | return NULL; | |
1228 | } | |
1229 | ||
c268433a RC |
1230 | static CORE_ADDR |
1231 | hppa_hpux_som_find_global_pointer (struct value *function) | |
1232 | { | |
1233 | CORE_ADDR faddr; | |
1234 | ||
1235 | faddr = value_as_address (function); | |
1236 | ||
1237 | /* Is this a plabel? If so, dereference it to get the gp value. */ | |
1238 | if (faddr & 2) | |
1239 | { | |
1240 | int status; | |
1241 | char buf[4]; | |
1242 | ||
1243 | faddr &= ~3; | |
1244 | ||
1245 | status = target_read_memory (faddr + 4, buf, sizeof (buf)); | |
1246 | if (status == 0) | |
1247 | return extract_unsigned_integer (buf, sizeof (buf)); | |
1248 | } | |
1249 | ||
1250 | return som_solib_get_got_by_pc (faddr); | |
1251 | } | |
1252 | ||
1253 | static CORE_ADDR | |
1254 | hppa_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, | |
1255 | CORE_ADDR funcaddr, int using_gcc, | |
1256 | struct value **args, int nargs, | |
1257 | struct type *value_type, | |
1258 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
1259 | { | |
1260 | /* FIXME: tausq/2004-06-09: This needs much more testing. It is broken | |
1261 | for pa64, but we should be able to get it to work with a little bit | |
1262 | of work. gdb-6.1 has a lot of code to handle various cases; I've tried to | |
1263 | simplify it and avoid compile-time conditionals. */ | |
1264 | ||
1265 | /* On HPUX, functions in the main executable and in libraries can be located | |
1266 | in different spaces. In order for us to be able to select the right | |
1267 | space for the function call, we need to go through an instruction seqeunce | |
1268 | to select the right space for the target function, call it, and then | |
1269 | restore the space on return. | |
1270 | ||
1271 | There are two helper routines that can be used for this task -- if | |
1272 | an application is linked with gcc, it will contain a __gcc_plt_call | |
1273 | helper function. __gcc_plt_call, when passed the entry point of an | |
1274 | import stub, will do the necessary space setting/restoration for the | |
1275 | target function. | |
1276 | ||
1277 | For programs that are compiled/linked with the HP compiler, a similar | |
1278 | function called __d_plt_call exists; __d_plt_call expects a PLABEL instead | |
1279 | of an import stub as an argument. | |
1280 | ||
080228b2 | 1281 | // *INDENT-OFF* |
c268433a RC |
1282 | To summarize, the call flow is: |
1283 | current function -> dummy frame -> __gcc_plt_call (import stub) | |
1284 | -> target function | |
1285 | or | |
1286 | current function -> dummy frame -> __d_plt_call (plabel) | |
1287 | -> target function | |
080228b2 | 1288 | // *INDENT-ON* |
c268433a RC |
1289 | |
1290 | In general the "funcaddr" argument passed to push_dummy_code is the actual | |
1291 | entry point of the target function. For __gcc_plt_call, we need to | |
1292 | locate the import stub for the corresponding function. Failing that, | |
1293 | we construct a dummy "import stub" on the stack to pass as an argument. | |
1294 | For __d_plt_call, we similarly synthesize a PLABEL on the stack to | |
1295 | pass to the helper function. | |
1296 | ||
1297 | An additional twist is that, in order for us to restore the space register | |
1298 | to its starting state, we need __gcc_plt_call/__d_plt_call to return | |
1299 | to the instruction where we started the call. However, if we put | |
1300 | the breakpoint there, gdb will complain because it will find two | |
1301 | frames on the stack with the same (sp, pc) (with the dummy frame in | |
1302 | between). Currently, we set the return pointer to (pc - 4) of the | |
1303 | current function. FIXME: This is not an ideal solution; possibly if the | |
1304 | current pc is at the beginning of a page, this will cause a page fault. | |
1305 | Need to understand this better and figure out a better way to fix it. */ | |
1306 | ||
1307 | struct minimal_symbol *sym; | |
1308 | ||
1309 | /* Nonzero if we will use GCC's PLT call routine. This routine must be | |
1310 | passed an import stub, not a PLABEL. It is also necessary to get %r19 | |
1311 | before performing the call. (This is done by push_dummy_call.) */ | |
1312 | int use_gcc_plt_call = 1; | |
1313 | ||
1314 | /* See if __gcc_plt_call is available; if not we will use the HP version | |
1315 | instead. */ | |
1316 | sym = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL); | |
1317 | if (sym == NULL) | |
1318 | use_gcc_plt_call = 0; | |
1319 | ||
1320 | /* If using __gcc_plt_call, we need to make sure we pass in an import | |
1321 | stub. funcaddr can be pointing to an export stub or a real function, | |
1322 | so we try to resolve it to the import stub. */ | |
1323 | if (use_gcc_plt_call) | |
1324 | { | |
1325 | struct objfile *objfile; | |
1326 | struct minimal_symbol *funsym, *stubsym; | |
1327 | CORE_ADDR stubaddr = 0; | |
1328 | ||
1329 | funsym = lookup_minimal_symbol_by_pc (funcaddr); | |
1330 | if (!funsym) | |
1331 | error ("Unable to find symbol for target function.\n"); | |
1332 | ||
1333 | ALL_OBJFILES (objfile) | |
1334 | { | |
1335 | stubsym = lookup_minimal_symbol_solib_trampoline | |
1336 | (SYMBOL_LINKAGE_NAME (funsym), objfile); | |
1337 | ||
1338 | if (stubsym) | |
1339 | { | |
1340 | struct unwind_table_entry *u; | |
1341 | ||
1342 | u = find_unwind_entry (SYMBOL_VALUE (stubsym)); | |
1343 | if (u == NULL | |
1344 | || (u->stub_unwind.stub_type != IMPORT | |
1345 | && u->stub_unwind.stub_type != IMPORT_SHLIB)) | |
1346 | continue; | |
1347 | ||
1348 | stubaddr = SYMBOL_VALUE (stubsym); | |
1349 | ||
1350 | /* If we found an IMPORT stub, then we can stop searching; | |
1351 | if we found an IMPORT_SHLIB, we want to continue the search | |
1352 | in the hopes that we will find an IMPORT stub. */ | |
1353 | if (u->stub_unwind.stub_type == IMPORT) | |
1354 | break; | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | if (stubaddr != 0) | |
1359 | { | |
1360 | /* Argument to __gcc_plt_call is passed in r22. */ | |
1361 | regcache_cooked_write_unsigned (current_regcache, 22, stubaddr); | |
1362 | } | |
1363 | else | |
1364 | { | |
1365 | /* No import stub found; let's synthesize one. */ | |
1366 | ||
1367 | /* ldsid %r21, %r1 */ | |
1368 | write_memory_unsigned_integer (sp, 4, 0x02a010a1); | |
1369 | /* mtsp %r1,%sr0 */ | |
1370 | write_memory_unsigned_integer (sp + 4, 4, 0x00011820); | |
1371 | /* be 0(%sr0, %r21) */ | |
1372 | write_memory_unsigned_integer (sp + 8, 4, 0xe2a00000); | |
1373 | /* nop */ | |
1374 | write_memory_unsigned_integer (sp + 12, 4, 0x08000240); | |
1375 | ||
1376 | regcache_cooked_write_unsigned (current_regcache, 21, funcaddr); | |
1377 | regcache_cooked_write_unsigned (current_regcache, 22, sp); | |
1378 | } | |
1379 | ||
1380 | /* We set the breakpoint address and r31 to (close to) where the current | |
1381 | pc is; when __gcc_plt_call returns, it will restore pcsqh to the | |
1382 | current value based on this. The -4 is needed for frame unwinding | |
1383 | to work properly -- we need to land in a different function than | |
1384 | the current function. */ | |
1385 | *bp_addr = (read_register (HPPA_PCOQ_HEAD_REGNUM) & ~3) - 4; | |
1386 | regcache_cooked_write_unsigned (current_regcache, 31, *bp_addr); | |
1387 | ||
1388 | /* Continue from __gcc_plt_call. */ | |
1389 | *real_pc = SYMBOL_VALUE (sym); | |
1390 | } | |
1391 | else | |
1392 | { | |
dd515450 | 1393 | ULONGEST gp; |
c268433a RC |
1394 | |
1395 | /* Use __d_plt_call as a fallback; __d_plt_call expects to be called | |
1396 | with a plabel, so we need to build one. */ | |
1397 | ||
1398 | sym = lookup_minimal_symbol ("__d_plt_call", NULL, NULL); | |
1399 | if (sym == NULL) | |
1400 | error("Can't find an address for __d_plt_call or __gcc_plt_call " | |
1401 | "trampoline\nSuggest linking executable with -g or compiling " | |
1402 | "with gcc."); | |
1403 | ||
1404 | gp = gdbarch_tdep (gdbarch)->find_global_pointer (funcaddr); | |
1405 | write_memory_unsigned_integer (sp, 4, funcaddr); | |
1406 | write_memory_unsigned_integer (sp + 4, 4, gp); | |
1407 | ||
1408 | /* plabel is passed in r22 */ | |
1409 | regcache_cooked_write_unsigned (current_regcache, 22, sp); | |
1410 | } | |
1411 | ||
1412 | /* Pushed one stack frame, which has to be 64-byte aligned. */ | |
1413 | sp += 64; | |
1414 | ||
1415 | return sp; | |
1416 | } | |
cc72850f MK |
1417 | \f |
1418 | ||
08d53055 MK |
1419 | /* Bit in the `ss_flag' member of `struct save_state' that indicates |
1420 | that the 64-bit register values are live. From | |
1421 | <machine/save_state.h>. */ | |
1422 | #define HPPA_HPUX_SS_WIDEREGS 0x40 | |
1423 | ||
1424 | /* Offsets of various parts of `struct save_state'. From | |
1425 | <machine/save_state.h>. */ | |
1426 | #define HPPA_HPUX_SS_FLAGS_OFFSET 0 | |
1427 | #define HPPA_HPUX_SS_NARROW_OFFSET 4 | |
1428 | #define HPPA_HPUX_SS_FPBLOCK_OFFSET 256 | |
1429 | #define HPPA_HPUX_SS_WIDE_OFFSET 640 | |
1430 | ||
1431 | /* The size of `struct save_state. */ | |
1432 | #define HPPA_HPUX_SAVE_STATE_SIZE 1152 | |
1433 | ||
1434 | /* The size of `struct pa89_save_state', which corresponds to PA-RISC | |
1435 | 1.1, the lowest common denominator that we support. */ | |
1436 | #define HPPA_HPUX_PA89_SAVE_STATE_SIZE 512 | |
1437 | ||
1438 | static void | |
1439 | hppa_hpux_supply_ss_narrow (struct regcache *regcache, | |
1440 | int regnum, const char *save_state) | |
1441 | { | |
1442 | const char *ss_narrow = save_state + HPPA_HPUX_SS_NARROW_OFFSET; | |
1443 | int i, offset = 0; | |
1444 | ||
1445 | for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++) | |
1446 | { | |
1447 | if (regnum == i || regnum == -1) | |
1448 | regcache_raw_supply (regcache, i, ss_narrow + offset); | |
1449 | ||
1450 | offset += 4; | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | static void | |
1455 | hppa_hpux_supply_ss_fpblock (struct regcache *regcache, | |
1456 | int regnum, const char *save_state) | |
1457 | { | |
1458 | const char *ss_fpblock = save_state + HPPA_HPUX_SS_FPBLOCK_OFFSET; | |
1459 | int i, offset = 0; | |
1460 | ||
1461 | /* FIXME: We view the floating-point state as 64 single-precision | |
1462 | registers for 32-bit code, and 32 double-precision register for | |
1463 | 64-bit code. This distinction is artificial and should be | |
1464 | eliminated. If that ever happens, we should remove the if-clause | |
1465 | below. */ | |
1466 | ||
1467 | if (register_size (get_regcache_arch (regcache), HPPA_FP0_REGNUM) == 4) | |
1468 | { | |
1469 | for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 64; i++) | |
1470 | { | |
1471 | if (regnum == i || regnum == -1) | |
1472 | regcache_raw_supply (regcache, i, ss_fpblock + offset); | |
1473 | ||
1474 | offset += 4; | |
1475 | } | |
1476 | } | |
1477 | else | |
1478 | { | |
1479 | for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 32; i++) | |
1480 | { | |
1481 | if (regnum == i || regnum == -1) | |
1482 | regcache_raw_supply (regcache, i, ss_fpblock + offset); | |
1483 | ||
1484 | offset += 8; | |
1485 | } | |
1486 | } | |
1487 | } | |
1488 | ||
1489 | static void | |
1490 | hppa_hpux_supply_ss_wide (struct regcache *regcache, | |
1491 | int regnum, const char *save_state) | |
1492 | { | |
1493 | const char *ss_wide = save_state + HPPA_HPUX_SS_WIDE_OFFSET; | |
1494 | int i, offset = 8; | |
1495 | ||
1496 | if (register_size (get_regcache_arch (regcache), HPPA_R1_REGNUM) == 4) | |
1497 | offset += 4; | |
1498 | ||
1499 | for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++) | |
1500 | { | |
1501 | if (regnum == i || regnum == -1) | |
1502 | regcache_raw_supply (regcache, i, ss_wide + offset); | |
1503 | ||
1504 | offset += 8; | |
1505 | } | |
1506 | } | |
1507 | ||
1508 | static void | |
1509 | hppa_hpux_supply_save_state (const struct regset *regset, | |
1510 | struct regcache *regcache, | |
1511 | int regnum, const void *regs, size_t len) | |
1512 | { | |
1513 | const char *proc_info = regs; | |
1514 | const char *save_state = proc_info + 8; | |
1515 | ULONGEST flags; | |
1516 | ||
1517 | flags = extract_unsigned_integer (save_state + HPPA_HPUX_SS_FLAGS_OFFSET, 4); | |
1518 | if (regnum == -1 || regnum == HPPA_FLAGS_REGNUM) | |
1519 | { | |
1520 | struct gdbarch *arch = get_regcache_arch (regcache); | |
1521 | size_t size = register_size (arch, HPPA_FLAGS_REGNUM); | |
1522 | char buf[8]; | |
1523 | ||
1524 | store_unsigned_integer (buf, size, flags); | |
1525 | regcache_raw_supply (regcache, HPPA_FLAGS_REGNUM, buf); | |
1526 | } | |
1527 | ||
1528 | /* If the SS_WIDEREGS flag is set, we really do need the full | |
1529 | `struct save_state'. */ | |
1530 | if (flags & HPPA_HPUX_SS_WIDEREGS && len < HPPA_HPUX_SAVE_STATE_SIZE) | |
1531 | error ("Register set contents too small"); | |
1532 | ||
1533 | if (flags & HPPA_HPUX_SS_WIDEREGS) | |
1534 | hppa_hpux_supply_ss_wide (regcache, regnum, save_state); | |
1535 | else | |
1536 | hppa_hpux_supply_ss_narrow (regcache, regnum, save_state); | |
1537 | ||
1538 | hppa_hpux_supply_ss_fpblock (regcache, regnum, save_state); | |
1539 | } | |
1540 | ||
1541 | /* HP-UX register set. */ | |
1542 | ||
1543 | static struct regset hppa_hpux_regset = | |
1544 | { | |
1545 | NULL, | |
1546 | hppa_hpux_supply_save_state | |
1547 | }; | |
1548 | ||
1549 | static const struct regset * | |
1550 | hppa_hpux_regset_from_core_section (struct gdbarch *gdbarch, | |
1551 | const char *sect_name, size_t sect_size) | |
1552 | { | |
1553 | if (strcmp (sect_name, ".reg") == 0 | |
1554 | && sect_size >= HPPA_HPUX_PA89_SAVE_STATE_SIZE + 8) | |
1555 | return &hppa_hpux_regset; | |
1556 | ||
1557 | return NULL; | |
1558 | } | |
1559 | \f | |
1560 | ||
cc72850f MK |
1561 | /* Bit in the `ss_flag' member of `struct save_state' that indicates |
1562 | the state was saved from a system call. From | |
1563 | <machine/save_state.h>. */ | |
1564 | #define HPPA_HPUX_SS_INSYSCALL 0x02 | |
1565 | ||
1566 | static CORE_ADDR | |
1567 | hppa_hpux_read_pc (ptid_t ptid) | |
1568 | { | |
1569 | ULONGEST flags; | |
1570 | ||
1571 | /* If we're currently in a system call return the contents of %r31. */ | |
1572 | flags = read_register_pid (HPPA_FLAGS_REGNUM, ptid); | |
1573 | if (flags & HPPA_HPUX_SS_INSYSCALL) | |
1574 | return read_register_pid (HPPA_R31_REGNUM, ptid) & ~0x3; | |
1575 | ||
1576 | return hppa_read_pc (ptid); | |
1577 | } | |
1578 | ||
1579 | static void | |
1580 | hppa_hpux_write_pc (CORE_ADDR pc, ptid_t ptid) | |
1581 | { | |
1582 | ULONGEST flags; | |
1583 | ||
1584 | /* If we're currently in a system call also write PC into %r31. */ | |
1585 | flags = read_register_pid (HPPA_FLAGS_REGNUM, ptid); | |
1586 | if (flags & HPPA_HPUX_SS_INSYSCALL) | |
1587 | write_register_pid (HPPA_R31_REGNUM, pc | 0x3, ptid); | |
1588 | ||
1589 | return hppa_write_pc (pc, ptid); | |
1590 | } | |
1591 | ||
1592 | static CORE_ADDR | |
1593 | hppa_hpux_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
1594 | { | |
1595 | ULONGEST flags; | |
1596 | ||
1597 | /* If we're currently in a system call return the contents of %r31. */ | |
1598 | flags = frame_unwind_register_unsigned (next_frame, HPPA_FLAGS_REGNUM); | |
1599 | if (flags & HPPA_HPUX_SS_INSYSCALL) | |
1600 | return frame_unwind_register_unsigned (next_frame, HPPA_R31_REGNUM) & ~0x3; | |
1601 | ||
1602 | return hppa_unwind_pc (gdbarch, next_frame); | |
1603 | } | |
1604 | \f | |
c268433a | 1605 | |
90f943f1 RC |
1606 | static void |
1607 | hppa_hpux_inferior_created (struct target_ops *objfile, int from_tty) | |
1608 | { | |
1609 | /* Some HP-UX related globals to clear when a new "main" | |
1610 | symbol file is loaded. HP-specific. */ | |
1611 | deprecated_hp_som_som_object_present = 0; | |
1612 | hp_cxx_exception_support_initialized = 0; | |
1613 | } | |
1614 | ||
f77a2124 RC |
1615 | /* Given the current value of the pc, check to see if it is inside a stub, and |
1616 | if so, change the value of the pc to point to the caller of the stub. | |
1617 | NEXT_FRAME is the next frame in the current list of frames. | |
1618 | BASE contains to stack frame base of the current frame. | |
1619 | SAVE_REGS is the register file stored in the frame cache. */ | |
1620 | static void | |
1621 | hppa_hpux_unwind_adjust_stub (struct frame_info *next_frame, CORE_ADDR base, | |
1622 | struct trad_frame_saved_reg *saved_regs) | |
1623 | { | |
1624 | int optimized, realreg; | |
1625 | enum lval_type lval; | |
1626 | CORE_ADDR addr; | |
1627 | char buffer[sizeof(ULONGEST)]; | |
1628 | ULONGEST val; | |
1629 | CORE_ADDR stubpc; | |
1630 | struct unwind_table_entry *u; | |
1631 | ||
1632 | trad_frame_get_prev_register (next_frame, saved_regs, | |
1633 | HPPA_PCOQ_HEAD_REGNUM, | |
1634 | &optimized, &lval, &addr, &realreg, buffer); | |
1635 | val = extract_unsigned_integer (buffer, | |
1636 | register_size (get_frame_arch (next_frame), | |
1637 | HPPA_PCOQ_HEAD_REGNUM)); | |
1638 | ||
1639 | u = find_unwind_entry (val); | |
1640 | if (u && u->stub_unwind.stub_type == EXPORT) | |
1641 | { | |
1642 | stubpc = read_memory_integer (base - 24, TARGET_PTR_BIT / 8); | |
1643 | trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc); | |
1644 | } | |
1645 | else if (hppa_symbol_address ("__gcc_plt_call") | |
1646 | == get_pc_function_start (val)) | |
1647 | { | |
1648 | stubpc = read_memory_integer (base - 8, TARGET_PTR_BIT / 8); | |
1649 | trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc); | |
1650 | } | |
1651 | } | |
1652 | ||
7d773d96 JB |
1653 | static void |
1654 | hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1655 | { | |
abc485a1 RC |
1656 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1657 | ||
abc485a1 | 1658 | if (tdep->bytes_per_address == 4) |
84674fe1 | 1659 | tdep->in_solib_call_trampoline = hppa32_hpux_in_solib_call_trampoline; |
abc485a1 | 1660 | else |
84674fe1 | 1661 | tdep->in_solib_call_trampoline = hppa64_hpux_in_solib_call_trampoline; |
abc485a1 | 1662 | |
f77a2124 RC |
1663 | tdep->unwind_adjust_stub = hppa_hpux_unwind_adjust_stub; |
1664 | ||
3cd36e7c MK |
1665 | set_gdbarch_in_solib_return_trampoline |
1666 | (gdbarch, hppa_hpux_in_solib_return_trampoline); | |
abc485a1 | 1667 | set_gdbarch_skip_trampoline_code (gdbarch, hppa_hpux_skip_trampoline_code); |
43613416 | 1668 | |
c268433a RC |
1669 | set_gdbarch_push_dummy_code (gdbarch, hppa_hpux_push_dummy_code); |
1670 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); | |
1671 | ||
cc72850f MK |
1672 | set_gdbarch_read_pc (gdbarch, hppa_hpux_read_pc); |
1673 | set_gdbarch_write_pc (gdbarch, hppa_hpux_write_pc); | |
1674 | set_gdbarch_unwind_pc (gdbarch, hppa_hpux_unwind_pc); | |
1675 | ||
08d53055 MK |
1676 | set_gdbarch_regset_from_core_section |
1677 | (gdbarch, hppa_hpux_regset_from_core_section); | |
1678 | ||
43613416 | 1679 | frame_unwind_append_sniffer (gdbarch, hppa_hpux_sigtramp_unwind_sniffer); |
90f943f1 RC |
1680 | |
1681 | observer_attach_inferior_created (hppa_hpux_inferior_created); | |
7d773d96 | 1682 | } |
60e1ff27 | 1683 | |
273f8429 JB |
1684 | static void |
1685 | hppa_hpux_som_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1686 | { | |
fdd72f95 RC |
1687 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1688 | ||
1689 | tdep->is_elf = 0; | |
c268433a RC |
1690 | |
1691 | tdep->find_global_pointer = hppa_hpux_som_find_global_pointer; | |
7d773d96 | 1692 | hppa_hpux_init_abi (info, gdbarch); |
273f8429 JB |
1693 | } |
1694 | ||
1695 | static void | |
1696 | hppa_hpux_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1697 | { | |
fdd72f95 RC |
1698 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1699 | ||
1700 | tdep->is_elf = 1; | |
7d773d96 | 1701 | hppa_hpux_init_abi (info, gdbarch); |
273f8429 JB |
1702 | } |
1703 | ||
08d53055 MK |
1704 | static enum gdb_osabi |
1705 | hppa_hpux_core_osabi_sniffer (bfd *abfd) | |
1706 | { | |
1707 | if (strcmp (bfd_get_target (abfd), "hpux-core") == 0) | |
1708 | return GDB_OSABI_HPUX_SOM; | |
1709 | ||
1710 | return GDB_OSABI_UNKNOWN; | |
1711 | } | |
1712 | ||
273f8429 JB |
1713 | void |
1714 | _initialize_hppa_hpux_tdep (void) | |
1715 | { | |
08d53055 MK |
1716 | /* BFD doesn't set a flavour for HP-UX style core files. It doesn't |
1717 | set the architecture either. */ | |
1718 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, | |
1719 | bfd_target_unknown_flavour, | |
1720 | hppa_hpux_core_osabi_sniffer); | |
1721 | ||
05816f70 | 1722 | gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_HPUX_SOM, |
273f8429 | 1723 | hppa_hpux_som_init_abi); |
51db5742 | 1724 | gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_HPUX_ELF, |
273f8429 JB |
1725 | hppa_hpux_elf_init_abi); |
1726 | } |