Commit | Line | Data |
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b1acf338 | 1 | /* Target-dependent code for HP-UX on PA-RISC. |
ef6e7e13 | 2 | |
4c38e0a4 | 3 | Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010 |
9b254dd1 | 4 | Free Software Foundation, Inc. |
273f8429 | 5 | |
b1acf338 | 6 | This file is part of GDB. |
273f8429 | 7 | |
b1acf338 MK |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
b1acf338 | 11 | (at your option) any later version. |
273f8429 | 12 | |
b1acf338 MK |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
273f8429 | 17 | |
b1acf338 | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
273f8429 JB |
20 | |
21 | #include "defs.h" | |
22 | #include "arch-utils.h" | |
60e1ff27 | 23 | #include "gdbcore.h" |
273f8429 | 24 | #include "osabi.h" |
222e5d1d | 25 | #include "frame.h" |
43613416 RC |
26 | #include "frame-unwind.h" |
27 | #include "trad-frame.h" | |
4c02c60c AC |
28 | #include "symtab.h" |
29 | #include "objfiles.h" | |
30 | #include "inferior.h" | |
31 | #include "infcall.h" | |
90f943f1 | 32 | #include "observer.h" |
acf86d54 RC |
33 | #include "hppa-tdep.h" |
34 | #include "solib-som.h" | |
35 | #include "solib-pa64.h" | |
08d53055 | 36 | #include "regset.h" |
e7b17823 | 37 | #include "regcache.h" |
60250e8b | 38 | #include "exceptions.h" |
08d53055 MK |
39 | |
40 | #include "gdb_string.h" | |
4c02c60c | 41 | |
77d18ded RC |
42 | #define IS_32BIT_TARGET(_gdbarch) \ |
43 | ((gdbarch_tdep (_gdbarch))->bytes_per_address == 4) | |
44 | ||
27b08a0c RC |
45 | /* Bit in the `ss_flag' member of `struct save_state' that indicates |
46 | that the 64-bit register values are live. From | |
47 | <machine/save_state.h>. */ | |
48 | #define HPPA_HPUX_SS_WIDEREGS 0x40 | |
49 | ||
50 | /* Offsets of various parts of `struct save_state'. From | |
51 | <machine/save_state.h>. */ | |
52 | #define HPPA_HPUX_SS_FLAGS_OFFSET 0 | |
53 | #define HPPA_HPUX_SS_NARROW_OFFSET 4 | |
54 | #define HPPA_HPUX_SS_FPBLOCK_OFFSET 256 | |
55 | #define HPPA_HPUX_SS_WIDE_OFFSET 640 | |
56 | ||
57 | /* The size of `struct save_state. */ | |
58 | #define HPPA_HPUX_SAVE_STATE_SIZE 1152 | |
59 | ||
60 | /* The size of `struct pa89_save_state', which corresponds to PA-RISC | |
61 | 1.1, the lowest common denominator that we support. */ | |
62 | #define HPPA_HPUX_PA89_SAVE_STATE_SIZE 512 | |
63 | ||
64 | ||
273f8429 JB |
65 | /* Forward declarations. */ |
66 | extern void _initialize_hppa_hpux_tdep (void); | |
67 | extern initialize_file_ftype _initialize_hppa_hpux_tdep; | |
68 | ||
77d18ded RC |
69 | static int |
70 | in_opd_section (CORE_ADDR pc) | |
71 | { | |
72 | struct obj_section *s; | |
73 | int retval = 0; | |
74 | ||
75 | s = find_pc_section (pc); | |
76 | ||
77 | retval = (s != NULL | |
78 | && s->the_bfd_section->name != NULL | |
79 | && strcmp (s->the_bfd_section->name, ".opd") == 0); | |
80 | return (retval); | |
81 | } | |
82 | ||
abc485a1 RC |
83 | /* Return one if PC is in the call path of a trampoline, else return zero. |
84 | ||
85 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
86 | just shared library trampolines (import, export). */ | |
87 | ||
88 | static int | |
e17a4113 UW |
89 | hppa32_hpux_in_solib_call_trampoline (struct gdbarch *gdbarch, |
90 | CORE_ADDR pc, char *name) | |
abc485a1 | 91 | { |
e17a4113 | 92 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
abc485a1 RC |
93 | struct minimal_symbol *minsym; |
94 | struct unwind_table_entry *u; | |
abc485a1 RC |
95 | |
96 | /* First see if PC is in one of the two C-library trampolines. */ | |
3388d7ff RC |
97 | if (pc == hppa_symbol_address("$$dyncall") |
98 | || pc == hppa_symbol_address("_sr4export")) | |
abc485a1 RC |
99 | return 1; |
100 | ||
101 | minsym = lookup_minimal_symbol_by_pc (pc); | |
3567439c | 102 | if (minsym && strcmp (SYMBOL_LINKAGE_NAME (minsym), ".stub") == 0) |
abc485a1 RC |
103 | return 1; |
104 | ||
105 | /* Get the unwind descriptor corresponding to PC, return zero | |
106 | if no unwind was found. */ | |
107 | u = find_unwind_entry (pc); | |
108 | if (!u) | |
109 | return 0; | |
110 | ||
111 | /* If this isn't a linker stub, then return now. */ | |
112 | if (u->stub_unwind.stub_type == 0) | |
113 | return 0; | |
114 | ||
115 | /* By definition a long-branch stub is a call stub. */ | |
116 | if (u->stub_unwind.stub_type == LONG_BRANCH) | |
117 | return 1; | |
118 | ||
119 | /* The call and return path execute the same instructions within | |
120 | an IMPORT stub! So an IMPORT stub is both a call and return | |
121 | trampoline. */ | |
122 | if (u->stub_unwind.stub_type == IMPORT) | |
123 | return 1; | |
124 | ||
125 | /* Parameter relocation stubs always have a call path and may have a | |
126 | return path. */ | |
127 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
128 | || u->stub_unwind.stub_type == EXPORT) | |
129 | { | |
130 | CORE_ADDR addr; | |
131 | ||
132 | /* Search forward from the current PC until we hit a branch | |
133 | or the end of the stub. */ | |
134 | for (addr = pc; addr <= u->region_end; addr += 4) | |
135 | { | |
136 | unsigned long insn; | |
137 | ||
e17a4113 | 138 | insn = read_memory_integer (addr, 4, byte_order); |
abc485a1 RC |
139 | |
140 | /* Does it look like a bl? If so then it's the call path, if | |
141 | we find a bv or be first, then we're on the return path. */ | |
142 | if ((insn & 0xfc00e000) == 0xe8000000) | |
143 | return 1; | |
144 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
145 | || (insn & 0xfc000000) == 0xe0000000) | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* Should never happen. */ | |
8a3fe4f8 | 150 | warning (_("Unable to find branch in parameter relocation stub.")); |
abc485a1 RC |
151 | return 0; |
152 | } | |
153 | ||
154 | /* Unknown stub type. For now, just return zero. */ | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static int | |
e17a4113 UW |
159 | hppa64_hpux_in_solib_call_trampoline (struct gdbarch *gdbarch, |
160 | CORE_ADDR pc, char *name) | |
abc485a1 | 161 | { |
e17a4113 UW |
162 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
163 | ||
abc485a1 RC |
164 | /* PA64 has a completely different stub/trampoline scheme. Is it |
165 | better? Maybe. It's certainly harder to determine with any | |
166 | certainty that we are in a stub because we can not refer to the | |
167 | unwinders to help. | |
168 | ||
169 | The heuristic is simple. Try to lookup the current PC value in th | |
170 | minimal symbol table. If that fails, then assume we are not in a | |
171 | stub and return. | |
172 | ||
173 | Then see if the PC value falls within the section bounds for the | |
174 | section containing the minimal symbol we found in the first | |
175 | step. If it does, then assume we are not in a stub and return. | |
176 | ||
177 | Finally peek at the instructions to see if they look like a stub. */ | |
178 | struct minimal_symbol *minsym; | |
179 | asection *sec; | |
180 | CORE_ADDR addr; | |
181 | int insn, i; | |
182 | ||
183 | minsym = lookup_minimal_symbol_by_pc (pc); | |
184 | if (! minsym) | |
185 | return 0; | |
186 | ||
714835d5 | 187 | sec = SYMBOL_OBJ_SECTION (minsym)->the_bfd_section; |
abc485a1 RC |
188 | |
189 | if (bfd_get_section_vma (sec->owner, sec) <= pc | |
190 | && pc < (bfd_get_section_vma (sec->owner, sec) | |
191 | + bfd_section_size (sec->owner, sec))) | |
192 | return 0; | |
193 | ||
194 | /* We might be in a stub. Peek at the instructions. Stubs are 3 | |
195 | instructions long. */ | |
e17a4113 | 196 | insn = read_memory_integer (pc, 4, byte_order); |
abc485a1 RC |
197 | |
198 | /* Find out where we think we are within the stub. */ | |
199 | if ((insn & 0xffffc00e) == 0x53610000) | |
200 | addr = pc; | |
201 | else if ((insn & 0xffffffff) == 0xe820d000) | |
202 | addr = pc - 4; | |
203 | else if ((insn & 0xffffc00e) == 0x537b0000) | |
204 | addr = pc - 8; | |
205 | else | |
206 | return 0; | |
207 | ||
208 | /* Now verify each insn in the range looks like a stub instruction. */ | |
e17a4113 | 209 | insn = read_memory_integer (addr, 4, byte_order); |
abc485a1 RC |
210 | if ((insn & 0xffffc00e) != 0x53610000) |
211 | return 0; | |
212 | ||
213 | /* Now verify each insn in the range looks like a stub instruction. */ | |
e17a4113 | 214 | insn = read_memory_integer (addr + 4, 4, byte_order); |
abc485a1 RC |
215 | if ((insn & 0xffffffff) != 0xe820d000) |
216 | return 0; | |
217 | ||
218 | /* Now verify each insn in the range looks like a stub instruction. */ | |
e17a4113 | 219 | insn = read_memory_integer (addr + 8, 4, byte_order); |
abc485a1 RC |
220 | if ((insn & 0xffffc00e) != 0x537b0000) |
221 | return 0; | |
222 | ||
223 | /* Looks like a stub. */ | |
224 | return 1; | |
225 | } | |
226 | ||
227 | /* Return one if PC is in the return path of a trampoline, else return zero. | |
228 | ||
229 | Note we return one for *any* call trampoline (long-call, arg-reloc), not | |
230 | just shared library trampolines (import, export). */ | |
231 | ||
232 | static int | |
e17a4113 UW |
233 | hppa_hpux_in_solib_return_trampoline (struct gdbarch *gdbarch, |
234 | CORE_ADDR pc, char *name) | |
abc485a1 | 235 | { |
e17a4113 | 236 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
abc485a1 RC |
237 | struct unwind_table_entry *u; |
238 | ||
239 | /* Get the unwind descriptor corresponding to PC, return zero | |
240 | if no unwind was found. */ | |
241 | u = find_unwind_entry (pc); | |
242 | if (!u) | |
243 | return 0; | |
244 | ||
245 | /* If this isn't a linker stub or it's just a long branch stub, then | |
246 | return zero. */ | |
247 | if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH) | |
248 | return 0; | |
249 | ||
250 | /* The call and return path execute the same instructions within | |
251 | an IMPORT stub! So an IMPORT stub is both a call and return | |
252 | trampoline. */ | |
253 | if (u->stub_unwind.stub_type == IMPORT) | |
254 | return 1; | |
255 | ||
256 | /* Parameter relocation stubs always have a call path and may have a | |
257 | return path. */ | |
258 | if (u->stub_unwind.stub_type == PARAMETER_RELOCATION | |
259 | || u->stub_unwind.stub_type == EXPORT) | |
260 | { | |
261 | CORE_ADDR addr; | |
262 | ||
263 | /* Search forward from the current PC until we hit a branch | |
264 | or the end of the stub. */ | |
265 | for (addr = pc; addr <= u->region_end; addr += 4) | |
266 | { | |
267 | unsigned long insn; | |
268 | ||
e17a4113 | 269 | insn = read_memory_integer (addr, 4, byte_order); |
abc485a1 RC |
270 | |
271 | /* Does it look like a bl? If so then it's the call path, if | |
272 | we find a bv or be first, then we're on the return path. */ | |
273 | if ((insn & 0xfc00e000) == 0xe8000000) | |
274 | return 0; | |
275 | else if ((insn & 0xfc00e001) == 0xe800c000 | |
276 | || (insn & 0xfc000000) == 0xe0000000) | |
277 | return 1; | |
278 | } | |
279 | ||
280 | /* Should never happen. */ | |
8a3fe4f8 | 281 | warning (_("Unable to find branch in parameter relocation stub.")); |
abc485a1 RC |
282 | return 0; |
283 | } | |
284 | ||
285 | /* Unknown stub type. For now, just return zero. */ | |
286 | return 0; | |
287 | ||
288 | } | |
289 | ||
290 | /* Figure out if PC is in a trampoline, and if so find out where | |
291 | the trampoline will jump to. If not in a trampoline, return zero. | |
292 | ||
293 | Simple code examination probably is not a good idea since the code | |
294 | sequences in trampolines can also appear in user code. | |
295 | ||
296 | We use unwinds and information from the minimal symbol table to | |
297 | determine when we're in a trampoline. This won't work for ELF | |
298 | (yet) since it doesn't create stub unwind entries. Whether or | |
299 | not ELF will create stub unwinds or normal unwinds for linker | |
300 | stubs is still being debated. | |
301 | ||
302 | This should handle simple calls through dyncall or sr4export, | |
303 | long calls, argument relocation stubs, and dyncall/sr4export | |
304 | calling an argument relocation stub. It even handles some stubs | |
305 | used in dynamic executables. */ | |
306 | ||
307 | static CORE_ADDR | |
52f729a7 | 308 | hppa_hpux_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
abc485a1 | 309 | { |
464963c9 | 310 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
311 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
312 | int word_size = gdbarch_ptr_bit (gdbarch) / 8; | |
abc485a1 RC |
313 | long orig_pc = pc; |
314 | long prev_inst, curr_inst, loc; | |
abc485a1 RC |
315 | struct minimal_symbol *msym; |
316 | struct unwind_table_entry *u; | |
317 | ||
abc485a1 RC |
318 | /* Addresses passed to dyncall may *NOT* be the actual address |
319 | of the function. So we may have to do something special. */ | |
3388d7ff | 320 | if (pc == hppa_symbol_address("$$dyncall")) |
abc485a1 | 321 | { |
52f729a7 | 322 | pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22); |
abc485a1 RC |
323 | |
324 | /* If bit 30 (counting from the left) is on, then pc is the address of | |
325 | the PLT entry for this function, not the address of the function | |
326 | itself. Bit 31 has meaning too, but only for MPE. */ | |
327 | if (pc & 0x2) | |
e17a4113 | 328 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, word_size, byte_order); |
abc485a1 | 329 | } |
3388d7ff | 330 | if (pc == hppa_symbol_address("$$dyncall_external")) |
abc485a1 | 331 | { |
52f729a7 | 332 | pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22); |
e17a4113 | 333 | pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, word_size, byte_order); |
abc485a1 | 334 | } |
3388d7ff | 335 | else if (pc == hppa_symbol_address("_sr4export")) |
52f729a7 | 336 | pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22); |
abc485a1 RC |
337 | |
338 | /* Get the unwind descriptor corresponding to PC, return zero | |
339 | if no unwind was found. */ | |
340 | u = find_unwind_entry (pc); | |
341 | if (!u) | |
342 | return 0; | |
343 | ||
344 | /* If this isn't a linker stub, then return now. */ | |
345 | /* elz: attention here! (FIXME) because of a compiler/linker | |
346 | error, some stubs which should have a non zero stub_unwind.stub_type | |
347 | have unfortunately a value of zero. So this function would return here | |
348 | as if we were not in a trampoline. To fix this, we go look at the partial | |
349 | symbol information, which reports this guy as a stub. | |
350 | (FIXME): Unfortunately, we are not that lucky: it turns out that the | |
351 | partial symbol information is also wrong sometimes. This is because | |
352 | when it is entered (somread.c::som_symtab_read()) it can happen that | |
353 | if the type of the symbol (from the som) is Entry, and the symbol is | |
354 | in a shared library, then it can also be a trampoline. This would | |
355 | be OK, except that I believe the way they decide if we are ina shared library | |
356 | does not work. SOOOO..., even if we have a regular function w/o trampolines | |
357 | its minimal symbol can be assigned type mst_solib_trampoline. | |
358 | Also, if we find that the symbol is a real stub, then we fix the unwind | |
359 | descriptor, and define the stub type to be EXPORT. | |
360 | Hopefully this is correct most of the times. */ | |
361 | if (u->stub_unwind.stub_type == 0) | |
362 | { | |
363 | ||
364 | /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed | |
365 | we can delete all the code which appears between the lines */ | |
366 | /*--------------------------------------------------------------------------*/ | |
367 | msym = lookup_minimal_symbol_by_pc (pc); | |
368 | ||
369 | if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline) | |
370 | return orig_pc == pc ? 0 : pc & ~0x3; | |
371 | ||
372 | else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline) | |
373 | { | |
374 | struct objfile *objfile; | |
375 | struct minimal_symbol *msymbol; | |
376 | int function_found = 0; | |
377 | ||
378 | /* go look if there is another minimal symbol with the same name as | |
379 | this one, but with type mst_text. This would happen if the msym | |
380 | is an actual trampoline, in which case there would be another | |
381 | symbol with the same name corresponding to the real function */ | |
382 | ||
383 | ALL_MSYMBOLS (objfile, msymbol) | |
384 | { | |
385 | if (MSYMBOL_TYPE (msymbol) == mst_text | |
3567439c DJ |
386 | && strcmp (SYMBOL_LINKAGE_NAME (msymbol), |
387 | SYMBOL_LINKAGE_NAME (msym)) == 0) | |
abc485a1 RC |
388 | { |
389 | function_found = 1; | |
390 | break; | |
391 | } | |
392 | } | |
393 | ||
394 | if (function_found) | |
395 | /* the type of msym is correct (mst_solib_trampoline), but | |
396 | the unwind info is wrong, so set it to the correct value */ | |
397 | u->stub_unwind.stub_type = EXPORT; | |
398 | else | |
399 | /* the stub type info in the unwind is correct (this is not a | |
400 | trampoline), but the msym type information is wrong, it | |
401 | should be mst_text. So we need to fix the msym, and also | |
402 | get out of this function */ | |
403 | { | |
404 | MSYMBOL_TYPE (msym) = mst_text; | |
405 | return orig_pc == pc ? 0 : pc & ~0x3; | |
406 | } | |
407 | } | |
408 | ||
409 | /*--------------------------------------------------------------------------*/ | |
410 | } | |
411 | ||
412 | /* It's a stub. Search for a branch and figure out where it goes. | |
413 | Note we have to handle multi insn branch sequences like ldil;ble. | |
414 | Most (all?) other branches can be determined by examining the contents | |
415 | of certain registers and the stack. */ | |
416 | ||
417 | loc = pc; | |
418 | curr_inst = 0; | |
419 | prev_inst = 0; | |
420 | while (1) | |
421 | { | |
422 | /* Make sure we haven't walked outside the range of this stub. */ | |
423 | if (u != find_unwind_entry (loc)) | |
424 | { | |
8a3fe4f8 | 425 | warning (_("Unable to find branch in linker stub")); |
abc485a1 RC |
426 | return orig_pc == pc ? 0 : pc & ~0x3; |
427 | } | |
428 | ||
429 | prev_inst = curr_inst; | |
e17a4113 | 430 | curr_inst = read_memory_integer (loc, 4, byte_order); |
abc485a1 RC |
431 | |
432 | /* Does it look like a branch external using %r1? Then it's the | |
433 | branch from the stub to the actual function. */ | |
434 | if ((curr_inst & 0xffe0e000) == 0xe0202000) | |
435 | { | |
436 | /* Yup. See if the previous instruction loaded | |
437 | a value into %r1. If so compute and return the jump address. */ | |
438 | if ((prev_inst & 0xffe00000) == 0x20200000) | |
439 | return (hppa_extract_21 (prev_inst) + hppa_extract_17 (curr_inst)) & ~0x3; | |
440 | else | |
441 | { | |
8a3fe4f8 | 442 | warning (_("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).")); |
abc485a1 RC |
443 | return orig_pc == pc ? 0 : pc & ~0x3; |
444 | } | |
445 | } | |
446 | ||
447 | /* Does it look like a be 0(sr0,%r21)? OR | |
448 | Does it look like a be, n 0(sr0,%r21)? OR | |
449 | Does it look like a bve (r21)? (this is on PA2.0) | |
450 | Does it look like a bve, n(r21)? (this is also on PA2.0) | |
451 | That's the branch from an | |
452 | import stub to an export stub. | |
453 | ||
454 | It is impossible to determine the target of the branch via | |
455 | simple examination of instructions and/or data (consider | |
456 | that the address in the plabel may be the address of the | |
457 | bind-on-reference routine in the dynamic loader). | |
458 | ||
459 | So we have try an alternative approach. | |
460 | ||
461 | Get the name of the symbol at our current location; it should | |
462 | be a stub symbol with the same name as the symbol in the | |
463 | shared library. | |
464 | ||
465 | Then lookup a minimal symbol with the same name; we should | |
466 | get the minimal symbol for the target routine in the shared | |
467 | library as those take precedence of import/export stubs. */ | |
468 | if ((curr_inst == 0xe2a00000) || | |
469 | (curr_inst == 0xe2a00002) || | |
470 | (curr_inst == 0xeaa0d000) || | |
471 | (curr_inst == 0xeaa0d002)) | |
472 | { | |
473 | struct minimal_symbol *stubsym, *libsym; | |
474 | ||
475 | stubsym = lookup_minimal_symbol_by_pc (loc); | |
476 | if (stubsym == NULL) | |
477 | { | |
8a3fe4f8 | 478 | warning (_("Unable to find symbol for 0x%lx"), loc); |
abc485a1 RC |
479 | return orig_pc == pc ? 0 : pc & ~0x3; |
480 | } | |
481 | ||
3567439c | 482 | libsym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (stubsym), NULL, NULL); |
abc485a1 RC |
483 | if (libsym == NULL) |
484 | { | |
8a3fe4f8 | 485 | warning (_("Unable to find library symbol for %s."), |
3567439c | 486 | SYMBOL_PRINT_NAME (stubsym)); |
abc485a1 RC |
487 | return orig_pc == pc ? 0 : pc & ~0x3; |
488 | } | |
489 | ||
490 | return SYMBOL_VALUE (libsym); | |
491 | } | |
492 | ||
493 | /* Does it look like bl X,%rp or bl X,%r0? Another way to do a | |
494 | branch from the stub to the actual function. */ | |
495 | /*elz */ | |
496 | else if ((curr_inst & 0xffe0e000) == 0xe8400000 | |
497 | || (curr_inst & 0xffe0e000) == 0xe8000000 | |
498 | || (curr_inst & 0xffe0e000) == 0xe800A000) | |
499 | return (loc + hppa_extract_17 (curr_inst) + 8) & ~0x3; | |
500 | ||
501 | /* Does it look like bv (rp)? Note this depends on the | |
502 | current stack pointer being the same as the stack | |
503 | pointer in the stub itself! This is a branch on from the | |
504 | stub back to the original caller. */ | |
505 | /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */ | |
506 | else if ((curr_inst & 0xffe0f000) == 0xe840c000) | |
507 | { | |
508 | /* Yup. See if the previous instruction loaded | |
509 | rp from sp - 8. */ | |
510 | if (prev_inst == 0x4bc23ff1) | |
52f729a7 UW |
511 | { |
512 | CORE_ADDR sp; | |
513 | sp = get_frame_register_unsigned (frame, HPPA_SP_REGNUM); | |
e17a4113 | 514 | return read_memory_integer (sp - 8, 4, byte_order) & ~0x3; |
52f729a7 | 515 | } |
abc485a1 RC |
516 | else |
517 | { | |
8a3fe4f8 | 518 | warning (_("Unable to find restore of %%rp before bv (%%rp).")); |
abc485a1 RC |
519 | return orig_pc == pc ? 0 : pc & ~0x3; |
520 | } | |
521 | } | |
522 | ||
523 | /* elz: added this case to capture the new instruction | |
524 | at the end of the return part of an export stub used by | |
525 | the PA2.0: BVE, n (rp) */ | |
526 | else if ((curr_inst & 0xffe0f000) == 0xe840d000) | |
527 | { | |
528 | return (read_memory_integer | |
52f729a7 | 529 | (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24, |
e17a4113 | 530 | word_size, byte_order)) & ~0x3; |
abc485a1 RC |
531 | } |
532 | ||
533 | /* What about be,n 0(sr0,%rp)? It's just another way we return to | |
534 | the original caller from the stub. Used in dynamic executables. */ | |
535 | else if (curr_inst == 0xe0400002) | |
536 | { | |
537 | /* The value we jump to is sitting in sp - 24. But that's | |
538 | loaded several instructions before the be instruction. | |
539 | I guess we could check for the previous instruction being | |
540 | mtsp %r1,%sr0 if we want to do sanity checking. */ | |
541 | return (read_memory_integer | |
52f729a7 | 542 | (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24, |
e17a4113 | 543 | word_size, byte_order)) & ~0x3; |
abc485a1 RC |
544 | } |
545 | ||
546 | /* Haven't found the branch yet, but we're still in the stub. | |
547 | Keep looking. */ | |
548 | loc += 4; | |
549 | } | |
550 | } | |
551 | ||
6d350bb5 UW |
552 | static void |
553 | hppa_skip_permanent_breakpoint (struct regcache *regcache) | |
5aac166f RC |
554 | { |
555 | /* To step over a breakpoint instruction on the PA takes some | |
556 | fiddling with the instruction address queue. | |
557 | ||
558 | When we stop at a breakpoint, the IA queue front (the instruction | |
559 | we're executing now) points at the breakpoint instruction, and | |
560 | the IA queue back (the next instruction to execute) points to | |
561 | whatever instruction we would execute after the breakpoint, if it | |
562 | were an ordinary instruction. This is the case even if the | |
563 | breakpoint is in the delay slot of a branch instruction. | |
564 | ||
565 | Clearly, to step past the breakpoint, we need to set the queue | |
566 | front to the back. But what do we put in the back? What | |
567 | instruction comes after that one? Because of the branch delay | |
568 | slot, the next insn is always at the back + 4. */ | |
5aac166f | 569 | |
6d350bb5 UW |
570 | ULONGEST pcoq_tail, pcsq_tail; |
571 | regcache_cooked_read_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, &pcoq_tail); | |
572 | regcache_cooked_read_unsigned (regcache, HPPA_PCSQ_TAIL_REGNUM, &pcsq_tail); | |
573 | ||
574 | regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_HEAD_REGNUM, pcoq_tail); | |
575 | regcache_cooked_write_unsigned (regcache, HPPA_PCSQ_HEAD_REGNUM, pcsq_tail); | |
576 | ||
577 | regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, pcoq_tail + 4); | |
5aac166f RC |
578 | /* We can leave the tail's space the same, since there's no jump. */ |
579 | } | |
abc485a1 | 580 | |
4c02c60c | 581 | |
43613416 RC |
582 | /* Signal frames. */ |
583 | struct hppa_hpux_sigtramp_unwind_cache | |
584 | { | |
585 | CORE_ADDR base; | |
586 | struct trad_frame_saved_reg *saved_regs; | |
587 | }; | |
588 | ||
589 | static int hppa_hpux_tramp_reg[] = { | |
590 | HPPA_SAR_REGNUM, | |
591 | HPPA_PCOQ_HEAD_REGNUM, | |
592 | HPPA_PCSQ_HEAD_REGNUM, | |
593 | HPPA_PCOQ_TAIL_REGNUM, | |
594 | HPPA_PCSQ_TAIL_REGNUM, | |
595 | HPPA_EIEM_REGNUM, | |
596 | HPPA_IIR_REGNUM, | |
597 | HPPA_ISR_REGNUM, | |
598 | HPPA_IOR_REGNUM, | |
599 | HPPA_IPSW_REGNUM, | |
600 | -1, | |
601 | HPPA_SR4_REGNUM, | |
602 | HPPA_SR4_REGNUM + 1, | |
603 | HPPA_SR4_REGNUM + 2, | |
604 | HPPA_SR4_REGNUM + 3, | |
605 | HPPA_SR4_REGNUM + 4, | |
606 | HPPA_SR4_REGNUM + 5, | |
607 | HPPA_SR4_REGNUM + 6, | |
608 | HPPA_SR4_REGNUM + 7, | |
609 | HPPA_RCR_REGNUM, | |
610 | HPPA_PID0_REGNUM, | |
611 | HPPA_PID1_REGNUM, | |
612 | HPPA_CCR_REGNUM, | |
613 | HPPA_PID2_REGNUM, | |
614 | HPPA_PID3_REGNUM, | |
615 | HPPA_TR0_REGNUM, | |
616 | HPPA_TR0_REGNUM + 1, | |
617 | HPPA_TR0_REGNUM + 2, | |
618 | HPPA_CR27_REGNUM | |
619 | }; | |
620 | ||
621 | static struct hppa_hpux_sigtramp_unwind_cache * | |
227e86ad | 622 | hppa_hpux_sigtramp_frame_unwind_cache (struct frame_info *this_frame, |
43613416 RC |
623 | void **this_cache) |
624 | ||
625 | { | |
227e86ad | 626 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
43613416 | 627 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e17a4113 | 628 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
43613416 RC |
629 | struct hppa_hpux_sigtramp_unwind_cache *info; |
630 | unsigned int flag; | |
27b08a0c RC |
631 | CORE_ADDR sp, scptr, off; |
632 | int i, incr, szoff; | |
43613416 RC |
633 | |
634 | if (*this_cache) | |
635 | return *this_cache; | |
636 | ||
637 | info = FRAME_OBSTACK_ZALLOC (struct hppa_hpux_sigtramp_unwind_cache); | |
638 | *this_cache = info; | |
227e86ad | 639 | info->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
43613416 | 640 | |
227e86ad | 641 | sp = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM); |
43613416 | 642 | |
27b08a0c RC |
643 | if (IS_32BIT_TARGET (gdbarch)) |
644 | scptr = sp - 1352; | |
645 | else | |
646 | scptr = sp - 1520; | |
647 | ||
43613416 RC |
648 | off = scptr; |
649 | ||
650 | /* See /usr/include/machine/save_state.h for the structure of the save_state_t | |
651 | structure. */ | |
652 | ||
e17a4113 UW |
653 | flag = read_memory_unsigned_integer (scptr + HPPA_HPUX_SS_FLAGS_OFFSET, |
654 | 4, byte_order); | |
27b08a0c RC |
655 | |
656 | if (!(flag & HPPA_HPUX_SS_WIDEREGS)) | |
43613416 RC |
657 | { |
658 | /* Narrow registers. */ | |
27b08a0c | 659 | off = scptr + HPPA_HPUX_SS_NARROW_OFFSET; |
43613416 RC |
660 | incr = 4; |
661 | szoff = 0; | |
662 | } | |
663 | else | |
664 | { | |
665 | /* Wide registers. */ | |
27b08a0c | 666 | off = scptr + HPPA_HPUX_SS_WIDE_OFFSET + 8; |
43613416 RC |
667 | incr = 8; |
668 | szoff = (tdep->bytes_per_address == 4 ? 4 : 0); | |
669 | } | |
670 | ||
671 | for (i = 1; i < 32; i++) | |
672 | { | |
673 | info->saved_regs[HPPA_R0_REGNUM + i].addr = off + szoff; | |
674 | off += incr; | |
675 | } | |
676 | ||
01926a69 | 677 | for (i = 0; i < ARRAY_SIZE (hppa_hpux_tramp_reg); i++) |
43613416 RC |
678 | { |
679 | if (hppa_hpux_tramp_reg[i] > 0) | |
680 | info->saved_regs[hppa_hpux_tramp_reg[i]].addr = off + szoff; | |
27b08a0c | 681 | |
43613416 RC |
682 | off += incr; |
683 | } | |
684 | ||
685 | /* TODO: fp regs */ | |
686 | ||
227e86ad | 687 | info->base = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM); |
43613416 RC |
688 | |
689 | return info; | |
690 | } | |
691 | ||
692 | static void | |
227e86ad | 693 | hppa_hpux_sigtramp_frame_this_id (struct frame_info *this_frame, |
43613416 RC |
694 | void **this_prologue_cache, |
695 | struct frame_id *this_id) | |
696 | { | |
697 | struct hppa_hpux_sigtramp_unwind_cache *info | |
227e86ad JB |
698 | = hppa_hpux_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache); |
699 | ||
700 | *this_id = frame_id_build (info->base, get_frame_pc (this_frame)); | |
43613416 RC |
701 | } |
702 | ||
227e86ad JB |
703 | static struct value * |
704 | hppa_hpux_sigtramp_frame_prev_register (struct frame_info *this_frame, | |
a7aad9aa | 705 | void **this_prologue_cache, |
227e86ad | 706 | int regnum) |
43613416 RC |
707 | { |
708 | struct hppa_hpux_sigtramp_unwind_cache *info | |
227e86ad | 709 | = hppa_hpux_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache); |
43613416 | 710 | |
227e86ad JB |
711 | return hppa_frame_prev_register_helper (this_frame, info->saved_regs, regnum); |
712 | } | |
43613416 | 713 | |
227e86ad JB |
714 | static int |
715 | hppa_hpux_sigtramp_unwind_sniffer (const struct frame_unwind *self, | |
716 | struct frame_info *this_frame, | |
717 | void **this_cache) | |
43613416 | 718 | { |
e17a4113 UW |
719 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
720 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
765697c9 | 721 | struct unwind_table_entry *u; |
227e86ad | 722 | CORE_ADDR pc = get_frame_pc (this_frame); |
43613416 | 723 | |
765697c9 | 724 | u = find_unwind_entry (pc); |
43613416 | 725 | |
a717134b MK |
726 | /* If this is an export stub, try to get the unwind descriptor for |
727 | the actual function itself. */ | |
728 | if (u && u->stub_unwind.stub_type == EXPORT) | |
729 | { | |
730 | gdb_byte buf[HPPA_INSN_SIZE]; | |
731 | unsigned long insn; | |
732 | ||
227e86ad | 733 | if (!safe_frame_unwind_memory (this_frame, u->region_start, |
a717134b | 734 | buf, sizeof buf)) |
227e86ad | 735 | return 0; |
a717134b | 736 | |
e17a4113 | 737 | insn = extract_unsigned_integer (buf, sizeof buf, byte_order); |
a717134b MK |
738 | if ((insn & 0xffe0e000) == 0xe8400000) |
739 | u = find_unwind_entry(u->region_start + hppa_extract_17 (insn) + 8); | |
740 | } | |
741 | ||
765697c9 | 742 | if (u && u->HP_UX_interrupt_marker) |
227e86ad | 743 | return 1; |
43613416 | 744 | |
227e86ad | 745 | return 0; |
43613416 RC |
746 | } |
747 | ||
227e86ad JB |
748 | static const struct frame_unwind hppa_hpux_sigtramp_frame_unwind = { |
749 | SIGTRAMP_FRAME, | |
750 | hppa_hpux_sigtramp_frame_this_id, | |
751 | hppa_hpux_sigtramp_frame_prev_register, | |
752 | NULL, | |
753 | hppa_hpux_sigtramp_unwind_sniffer | |
754 | }; | |
755 | ||
c268433a | 756 | static CORE_ADDR |
e38c262f MD |
757 | hppa32_hpux_find_global_pointer (struct gdbarch *gdbarch, |
758 | struct value *function) | |
c268433a | 759 | { |
e17a4113 | 760 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
c268433a RC |
761 | CORE_ADDR faddr; |
762 | ||
763 | faddr = value_as_address (function); | |
764 | ||
765 | /* Is this a plabel? If so, dereference it to get the gp value. */ | |
766 | if (faddr & 2) | |
767 | { | |
768 | int status; | |
769 | char buf[4]; | |
770 | ||
771 | faddr &= ~3; | |
772 | ||
773 | status = target_read_memory (faddr + 4, buf, sizeof (buf)); | |
774 | if (status == 0) | |
e17a4113 | 775 | return extract_unsigned_integer (buf, sizeof (buf), byte_order); |
c268433a RC |
776 | } |
777 | ||
e38c262f | 778 | return gdbarch_tdep (gdbarch)->solib_get_got_by_pc (faddr); |
c268433a RC |
779 | } |
780 | ||
781 | static CORE_ADDR | |
e38c262f MD |
782 | hppa64_hpux_find_global_pointer (struct gdbarch *gdbarch, |
783 | struct value *function) | |
c268433a | 784 | { |
e17a4113 | 785 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
77d18ded RC |
786 | CORE_ADDR faddr; |
787 | char buf[32]; | |
788 | ||
789 | faddr = value_as_address (function); | |
790 | ||
791 | if (in_opd_section (faddr)) | |
792 | { | |
793 | target_read_memory (faddr, buf, sizeof (buf)); | |
e17a4113 | 794 | return extract_unsigned_integer (&buf[24], 8, byte_order); |
77d18ded RC |
795 | } |
796 | else | |
c268433a | 797 | { |
e38c262f | 798 | return gdbarch_tdep (gdbarch)->solib_get_got_by_pc (faddr); |
77d18ded RC |
799 | } |
800 | } | |
801 | ||
802 | static unsigned int ldsid_pattern[] = { | |
803 | 0x000010a0, /* ldsid (rX),rY */ | |
804 | 0x00001820, /* mtsp rY,sr0 */ | |
805 | 0xe0000000 /* be,n (sr0,rX) */ | |
806 | }; | |
807 | ||
808 | static CORE_ADDR | |
e17a4113 UW |
809 | hppa_hpux_search_pattern (struct gdbarch *gdbarch, |
810 | CORE_ADDR start, CORE_ADDR end, | |
77d18ded RC |
811 | unsigned int *patterns, int count) |
812 | { | |
e17a4113 | 813 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d275c051 MK |
814 | int num_insns = (end - start + HPPA_INSN_SIZE) / HPPA_INSN_SIZE; |
815 | unsigned int *insns; | |
816 | gdb_byte *buf; | |
77d18ded | 817 | int offset, i; |
77d18ded | 818 | |
d275c051 MK |
819 | buf = alloca (num_insns * HPPA_INSN_SIZE); |
820 | insns = alloca (num_insns * sizeof (unsigned int)); | |
c268433a | 821 | |
d275c051 MK |
822 | read_memory (start, buf, num_insns * HPPA_INSN_SIZE); |
823 | for (i = 0; i < num_insns; i++, buf += HPPA_INSN_SIZE) | |
e17a4113 | 824 | insns[i] = extract_unsigned_integer (buf, HPPA_INSN_SIZE, byte_order); |
c268433a | 825 | |
d275c051 | 826 | for (offset = 0; offset <= num_insns - count; offset++) |
77d18ded RC |
827 | { |
828 | for (i = 0; i < count; i++) | |
c268433a | 829 | { |
d275c051 | 830 | if ((insns[offset + i] & patterns[i]) != patterns[i]) |
77d18ded RC |
831 | break; |
832 | } | |
833 | if (i == count) | |
834 | break; | |
835 | } | |
d275c051 MK |
836 | |
837 | if (offset <= num_insns - count) | |
838 | return start + offset * HPPA_INSN_SIZE; | |
77d18ded RC |
839 | else |
840 | return 0; | |
841 | } | |
c268433a | 842 | |
77d18ded RC |
843 | static CORE_ADDR |
844 | hppa32_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc, | |
845 | int *argreg) | |
846 | { | |
e17a4113 | 847 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
77d18ded RC |
848 | struct objfile *obj; |
849 | struct obj_section *sec; | |
850 | struct hppa_objfile_private *priv; | |
851 | struct frame_info *frame; | |
852 | struct unwind_table_entry *u; | |
853 | CORE_ADDR addr, rp; | |
854 | char buf[4]; | |
855 | unsigned int insn; | |
856 | ||
857 | sec = find_pc_section (pc); | |
858 | obj = sec->objfile; | |
859 | priv = objfile_data (obj, hppa_objfile_priv_data); | |
860 | ||
861 | if (!priv) | |
862 | priv = hppa_init_objfile_priv_data (obj); | |
863 | if (!priv) | |
8a3fe4f8 | 864 | error (_("Internal error creating objfile private data.")); |
77d18ded RC |
865 | |
866 | /* Use the cached value if we have one. */ | |
867 | if (priv->dummy_call_sequence_addr != 0) | |
868 | { | |
869 | *argreg = priv->dummy_call_sequence_reg; | |
870 | return priv->dummy_call_sequence_addr; | |
871 | } | |
c268433a | 872 | |
77d18ded RC |
873 | /* First try a heuristic; if we are in a shared library call, our return |
874 | pointer is likely to point at an export stub. */ | |
875 | frame = get_current_frame (); | |
876 | rp = frame_unwind_register_unsigned (frame, 2); | |
877 | u = find_unwind_entry (rp); | |
878 | if (u && u->stub_unwind.stub_type == EXPORT) | |
879 | { | |
e17a4113 UW |
880 | addr = hppa_hpux_search_pattern (gdbarch, |
881 | u->region_start, u->region_end, | |
77d18ded RC |
882 | ldsid_pattern, |
883 | ARRAY_SIZE (ldsid_pattern)); | |
884 | if (addr) | |
885 | goto found_pattern; | |
886 | } | |
c268433a | 887 | |
77d18ded RC |
888 | /* Next thing to try is to look for an export stub. */ |
889 | if (priv->unwind_info) | |
890 | { | |
891 | int i; | |
c268433a | 892 | |
77d18ded RC |
893 | for (i = 0; i < priv->unwind_info->last; i++) |
894 | { | |
895 | struct unwind_table_entry *u; | |
896 | u = &priv->unwind_info->table[i]; | |
897 | if (u->stub_unwind.stub_type == EXPORT) | |
898 | { | |
e17a4113 UW |
899 | addr = hppa_hpux_search_pattern (gdbarch, |
900 | u->region_start, u->region_end, | |
77d18ded RC |
901 | ldsid_pattern, |
902 | ARRAY_SIZE (ldsid_pattern)); | |
903 | if (addr) | |
904 | { | |
905 | goto found_pattern; | |
906 | } | |
c268433a RC |
907 | } |
908 | } | |
77d18ded | 909 | } |
c268433a | 910 | |
77d18ded RC |
911 | /* Finally, if this is the main executable, try to locate a sequence |
912 | from noshlibs */ | |
913 | addr = hppa_symbol_address ("noshlibs"); | |
914 | sec = find_pc_section (addr); | |
915 | ||
916 | if (sec && sec->objfile == obj) | |
917 | { | |
918 | CORE_ADDR start, end; | |
919 | ||
920 | find_pc_partial_function (addr, NULL, &start, &end); | |
921 | if (start != 0 && end != 0) | |
c268433a | 922 | { |
e17a4113 | 923 | addr = hppa_hpux_search_pattern (gdbarch, start, end, ldsid_pattern, |
77d18ded RC |
924 | ARRAY_SIZE (ldsid_pattern)); |
925 | if (addr) | |
926 | goto found_pattern; | |
c268433a | 927 | } |
77d18ded RC |
928 | } |
929 | ||
930 | /* Can't find a suitable sequence. */ | |
931 | return 0; | |
932 | ||
933 | found_pattern: | |
934 | target_read_memory (addr, buf, sizeof (buf)); | |
e17a4113 | 935 | insn = extract_unsigned_integer (buf, sizeof (buf), byte_order); |
77d18ded RC |
936 | priv->dummy_call_sequence_addr = addr; |
937 | priv->dummy_call_sequence_reg = (insn >> 21) & 0x1f; | |
938 | ||
939 | *argreg = priv->dummy_call_sequence_reg; | |
940 | return priv->dummy_call_sequence_addr; | |
941 | } | |
942 | ||
943 | static CORE_ADDR | |
944 | hppa64_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc, | |
945 | int *argreg) | |
946 | { | |
e17a4113 | 947 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
77d18ded RC |
948 | struct objfile *obj; |
949 | struct obj_section *sec; | |
950 | struct hppa_objfile_private *priv; | |
951 | CORE_ADDR addr; | |
952 | struct minimal_symbol *msym; | |
953 | int i; | |
954 | ||
955 | sec = find_pc_section (pc); | |
956 | obj = sec->objfile; | |
957 | priv = objfile_data (obj, hppa_objfile_priv_data); | |
958 | ||
959 | if (!priv) | |
960 | priv = hppa_init_objfile_priv_data (obj); | |
961 | if (!priv) | |
8a3fe4f8 | 962 | error (_("Internal error creating objfile private data.")); |
77d18ded RC |
963 | |
964 | /* Use the cached value if we have one. */ | |
965 | if (priv->dummy_call_sequence_addr != 0) | |
966 | { | |
967 | *argreg = priv->dummy_call_sequence_reg; | |
968 | return priv->dummy_call_sequence_addr; | |
969 | } | |
970 | ||
971 | /* FIXME: Without stub unwind information, locating a suitable sequence is | |
972 | fairly difficult. For now, we implement a very naive and inefficient | |
973 | scheme; try to read in blocks of code, and look for a "bve,n (rp)" | |
974 | instruction. These are likely to occur at the end of functions, so | |
975 | we only look at the last two instructions of each function. */ | |
976 | for (i = 0, msym = obj->msymbols; i < obj->minimal_symbol_count; i++, msym++) | |
977 | { | |
978 | CORE_ADDR begin, end; | |
979 | char *name; | |
d275c051 | 980 | gdb_byte buf[2 * HPPA_INSN_SIZE]; |
77d18ded RC |
981 | int offset; |
982 | ||
983 | find_pc_partial_function (SYMBOL_VALUE_ADDRESS (msym), &name, | |
984 | &begin, &end); | |
985 | ||
81092a3e | 986 | if (name == NULL || begin == 0 || end == 0) |
77d18ded RC |
987 | continue; |
988 | ||
d275c051 | 989 | if (target_read_memory (end - sizeof (buf), buf, sizeof (buf)) == 0) |
c268433a | 990 | { |
d275c051 | 991 | for (offset = 0; offset < sizeof (buf); offset++) |
77d18ded RC |
992 | { |
993 | unsigned int insn; | |
994 | ||
e17a4113 UW |
995 | insn = extract_unsigned_integer (buf + offset, |
996 | HPPA_INSN_SIZE, byte_order); | |
77d18ded RC |
997 | if (insn == 0xe840d002) /* bve,n (rp) */ |
998 | { | |
d275c051 | 999 | addr = (end - sizeof (buf)) + offset; |
77d18ded RC |
1000 | goto found_pattern; |
1001 | } | |
1002 | } | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | /* Can't find a suitable sequence. */ | |
1007 | return 0; | |
1008 | ||
1009 | found_pattern: | |
1010 | priv->dummy_call_sequence_addr = addr; | |
1011 | /* Right now we only look for a "bve,l (rp)" sequence, so the register is | |
1012 | always HPPA_RP_REGNUM. */ | |
1013 | priv->dummy_call_sequence_reg = HPPA_RP_REGNUM; | |
1014 | ||
1015 | *argreg = priv->dummy_call_sequence_reg; | |
1016 | return priv->dummy_call_sequence_addr; | |
1017 | } | |
1018 | ||
1019 | static CORE_ADDR | |
1020 | hppa_hpux_find_import_stub_for_addr (CORE_ADDR funcaddr) | |
1021 | { | |
1022 | struct objfile *objfile; | |
1023 | struct minimal_symbol *funsym, *stubsym; | |
1024 | CORE_ADDR stubaddr; | |
1025 | ||
1026 | funsym = lookup_minimal_symbol_by_pc (funcaddr); | |
1027 | stubaddr = 0; | |
1028 | ||
1029 | ALL_OBJFILES (objfile) | |
1030 | { | |
1031 | stubsym = lookup_minimal_symbol_solib_trampoline | |
1032 | (SYMBOL_LINKAGE_NAME (funsym), objfile); | |
1033 | ||
1034 | if (stubsym) | |
1035 | { | |
1036 | struct unwind_table_entry *u; | |
1037 | ||
1038 | u = find_unwind_entry (SYMBOL_VALUE (stubsym)); | |
1039 | if (u == NULL | |
1040 | || (u->stub_unwind.stub_type != IMPORT | |
1041 | && u->stub_unwind.stub_type != IMPORT_SHLIB)) | |
1042 | continue; | |
1043 | ||
1044 | stubaddr = SYMBOL_VALUE (stubsym); | |
1045 | ||
1046 | /* If we found an IMPORT stub, then we can stop searching; | |
1047 | if we found an IMPORT_SHLIB, we want to continue the search | |
1048 | in the hopes that we will find an IMPORT stub. */ | |
1049 | if (u->stub_unwind.stub_type == IMPORT) | |
1050 | break; | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | return stubaddr; | |
1055 | } | |
1056 | ||
1057 | static int | |
e38c262f | 1058 | hppa_hpux_sr_for_addr (struct gdbarch *gdbarch, CORE_ADDR addr) |
77d18ded RC |
1059 | { |
1060 | int sr; | |
1061 | /* The space register to use is encoded in the top 2 bits of the address. */ | |
e38c262f | 1062 | sr = addr >> (gdbarch_tdep (gdbarch)->bytes_per_address * 8 - 2); |
77d18ded RC |
1063 | return sr + 4; |
1064 | } | |
1065 | ||
1066 | static CORE_ADDR | |
1067 | hppa_hpux_find_dummy_bpaddr (CORE_ADDR addr) | |
1068 | { | |
1069 | /* In order for us to restore the space register to its starting state, | |
1070 | we need the dummy trampoline to return to the an instruction address in | |
1071 | the same space as where we started the call. We used to place the | |
1072 | breakpoint near the current pc, however, this breaks nested dummy calls | |
1073 | as the nested call will hit the breakpoint address and terminate | |
1074 | prematurely. Instead, we try to look for an address in the same space to | |
1075 | put the breakpoint. | |
1076 | ||
1077 | This is similar in spirit to putting the breakpoint at the "entry point" | |
1078 | of an executable. */ | |
1079 | ||
1080 | struct obj_section *sec; | |
1081 | struct unwind_table_entry *u; | |
1082 | struct minimal_symbol *msym; | |
1083 | CORE_ADDR func; | |
1084 | int i; | |
1085 | ||
1086 | sec = find_pc_section (addr); | |
1087 | if (sec) | |
1088 | { | |
1089 | /* First try the lowest address in the section; we can use it as long | |
1090 | as it is "regular" code (i.e. not a stub) */ | |
aded6f54 | 1091 | u = find_unwind_entry (obj_section_addr (sec)); |
77d18ded | 1092 | if (!u || u->stub_unwind.stub_type == 0) |
aded6f54 | 1093 | return obj_section_addr (sec); |
77d18ded RC |
1094 | |
1095 | /* Otherwise, we need to find a symbol for a regular function. We | |
1096 | do this by walking the list of msymbols in the objfile. The symbol | |
1097 | we find should not be the same as the function that was passed in. */ | |
1098 | ||
1099 | /* FIXME: this is broken, because we can find a function that will be | |
1100 | called by the dummy call target function, which will still not | |
1101 | work. */ | |
1102 | ||
1103 | find_pc_partial_function (addr, NULL, &func, NULL); | |
1104 | for (i = 0, msym = sec->objfile->msymbols; | |
1105 | i < sec->objfile->minimal_symbol_count; | |
1106 | i++, msym++) | |
1107 | { | |
1108 | u = find_unwind_entry (SYMBOL_VALUE_ADDRESS (msym)); | |
1109 | if (func != SYMBOL_VALUE_ADDRESS (msym) | |
1110 | && (!u || u->stub_unwind.stub_type == 0)) | |
1111 | return SYMBOL_VALUE_ADDRESS (msym); | |
c268433a | 1112 | } |
77d18ded | 1113 | } |
c268433a | 1114 | |
8a3fe4f8 AC |
1115 | warning (_("Cannot find suitable address to place dummy breakpoint; nested " |
1116 | "calls may fail.")); | |
77d18ded RC |
1117 | return addr - 4; |
1118 | } | |
1119 | ||
1120 | static CORE_ADDR | |
1121 | hppa_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, | |
82585c72 | 1122 | CORE_ADDR funcaddr, |
77d18ded RC |
1123 | struct value **args, int nargs, |
1124 | struct type *value_type, | |
e4fd649a UW |
1125 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr, |
1126 | struct regcache *regcache) | |
77d18ded RC |
1127 | { |
1128 | CORE_ADDR pc, stubaddr; | |
9846e541 | 1129 | int argreg = 0; |
77d18ded | 1130 | |
fb14de7b | 1131 | pc = regcache_read_pc (regcache); |
77d18ded RC |
1132 | |
1133 | /* Note: we don't want to pass a function descriptor here; push_dummy_call | |
1134 | fills in the PIC register for us. */ | |
1135 | funcaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funcaddr, NULL); | |
1136 | ||
1137 | /* The simple case is where we call a function in the same space that we are | |
1138 | currently in; in that case we don't really need to do anything. */ | |
e38c262f MD |
1139 | if (hppa_hpux_sr_for_addr (gdbarch, pc) |
1140 | == hppa_hpux_sr_for_addr (gdbarch, funcaddr)) | |
77d18ded RC |
1141 | { |
1142 | /* Intraspace call. */ | |
1143 | *bp_addr = hppa_hpux_find_dummy_bpaddr (pc); | |
1144 | *real_pc = funcaddr; | |
e4fd649a | 1145 | regcache_cooked_write_unsigned (regcache, HPPA_RP_REGNUM, *bp_addr); |
77d18ded RC |
1146 | |
1147 | return sp; | |
1148 | } | |
1149 | ||
1150 | /* In order to make an interspace call, we need to go through a stub. | |
1151 | gcc supplies an appropriate stub called "__gcc_plt_call", however, if | |
1152 | an application is compiled with HP compilers then this stub is not | |
1153 | available. We used to fallback to "__d_plt_call", however that stub | |
1154 | is not entirely useful for us because it doesn't do an interspace | |
1155 | return back to the caller. Also, on hppa64-hpux, there is no | |
1156 | __gcc_plt_call available. In order to keep the code uniform, we | |
1157 | instead don't use either of these stubs, but instead write our own | |
1158 | onto the stack. | |
1159 | ||
1160 | A problem arises since the stack is located in a different space than | |
1161 | code, so in order to branch to a stack stub, we will need to do an | |
1162 | interspace branch. Previous versions of gdb did this by modifying code | |
1163 | at the current pc and doing single-stepping to set the pcsq. Since this | |
1164 | is highly undesirable, we use a different scheme: | |
1165 | ||
1166 | All we really need to do the branch to the stub is a short instruction | |
1167 | sequence like this: | |
1168 | ||
1169 | PA1.1: | |
1170 | ldsid (rX),r1 | |
1171 | mtsp r1,sr0 | |
1172 | be,n (sr0,rX) | |
1173 | ||
1174 | PA2.0: | |
1175 | bve,n (sr0,rX) | |
1176 | ||
1177 | Instead of writing these sequences ourselves, we can find it in | |
1178 | the instruction stream that belongs to the current space. While this | |
1179 | seems difficult at first, we are actually guaranteed to find the sequences | |
1180 | in several places: | |
1181 | ||
1182 | For 32-bit code: | |
1183 | - in export stubs for shared libraries | |
1184 | - in the "noshlibs" routine in the main module | |
1185 | ||
1186 | For 64-bit code: | |
1187 | - at the end of each "regular" function | |
1188 | ||
1189 | We cache the address of these sequences in the objfile's private data | |
1190 | since these operations can potentially be quite expensive. | |
1191 | ||
1192 | So, what we do is: | |
1193 | - write a stack trampoline | |
1194 | - look for a suitable instruction sequence in the current space | |
1195 | - point the sequence at the trampoline | |
1196 | - set the return address of the trampoline to the current space | |
1197 | (see hppa_hpux_find_dummy_call_bpaddr) | |
1198 | - set the continuing address of the "dummy code" as the sequence. | |
1199 | ||
1200 | */ | |
1201 | ||
1202 | if (IS_32BIT_TARGET (gdbarch)) | |
1203 | { | |
1204 | static unsigned int hppa32_tramp[] = { | |
1205 | 0x0fdf1291, /* stw r31,-8(,sp) */ | |
1206 | 0x02c010a1, /* ldsid (,r22),r1 */ | |
1207 | 0x00011820, /* mtsp r1,sr0 */ | |
1208 | 0xe6c00000, /* be,l 0(sr0,r22),%sr0,%r31 */ | |
1209 | 0x081f0242, /* copy r31,rp */ | |
1210 | 0x0fd11082, /* ldw -8(,sp),rp */ | |
1211 | 0x004010a1, /* ldsid (,rp),r1 */ | |
1212 | 0x00011820, /* mtsp r1,sr0 */ | |
1213 | 0xe0400000, /* be 0(sr0,rp) */ | |
1214 | 0x08000240 /* nop */ | |
1215 | }; | |
1216 | ||
1217 | /* for hppa32, we must call the function through a stub so that on | |
1218 | return it can return to the space of our trampoline. */ | |
1219 | stubaddr = hppa_hpux_find_import_stub_for_addr (funcaddr); | |
1220 | if (stubaddr == 0) | |
8a3fe4f8 AC |
1221 | error (_("Cannot call external function not referenced by application " |
1222 | "(no import stub).\n")); | |
e4fd649a | 1223 | regcache_cooked_write_unsigned (regcache, 22, stubaddr); |
77d18ded RC |
1224 | |
1225 | write_memory (sp, (char *)&hppa32_tramp, sizeof (hppa32_tramp)); | |
1226 | ||
1227 | *bp_addr = hppa_hpux_find_dummy_bpaddr (pc); | |
e4fd649a | 1228 | regcache_cooked_write_unsigned (regcache, 31, *bp_addr); |
c268433a | 1229 | |
77d18ded RC |
1230 | *real_pc = hppa32_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg); |
1231 | if (*real_pc == 0) | |
8a3fe4f8 | 1232 | error (_("Cannot make interspace call from here.")); |
77d18ded | 1233 | |
e4fd649a | 1234 | regcache_cooked_write_unsigned (regcache, argreg, sp); |
77d18ded RC |
1235 | |
1236 | sp += sizeof (hppa32_tramp); | |
c268433a RC |
1237 | } |
1238 | else | |
1239 | { | |
77d18ded RC |
1240 | static unsigned int hppa64_tramp[] = { |
1241 | 0xeac0f000, /* bve,l (r22),%r2 */ | |
1242 | 0x0fdf12d1, /* std r31,-8(,sp) */ | |
1243 | 0x0fd110c2, /* ldd -8(,sp),rp */ | |
1244 | 0xe840d002, /* bve,n (rp) */ | |
1245 | 0x08000240 /* nop */ | |
1246 | }; | |
1247 | ||
1248 | /* for hppa64, we don't need to call through a stub; all functions | |
1249 | return via a bve. */ | |
e4fd649a | 1250 | regcache_cooked_write_unsigned (regcache, 22, funcaddr); |
77d18ded RC |
1251 | write_memory (sp, (char *)&hppa64_tramp, sizeof (hppa64_tramp)); |
1252 | ||
1253 | *bp_addr = pc - 4; | |
e4fd649a | 1254 | regcache_cooked_write_unsigned (regcache, 31, *bp_addr); |
c268433a | 1255 | |
77d18ded RC |
1256 | *real_pc = hppa64_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg); |
1257 | if (*real_pc == 0) | |
8a3fe4f8 | 1258 | error (_("Cannot make interspace call from here.")); |
c268433a | 1259 | |
e4fd649a | 1260 | regcache_cooked_write_unsigned (regcache, argreg, sp); |
c268433a | 1261 | |
77d18ded | 1262 | sp += sizeof (hppa64_tramp); |
c268433a RC |
1263 | } |
1264 | ||
77d18ded | 1265 | sp = gdbarch_frame_align (gdbarch, sp); |
c268433a RC |
1266 | |
1267 | return sp; | |
1268 | } | |
77d18ded | 1269 | |
cc72850f MK |
1270 | \f |
1271 | ||
08d53055 MK |
1272 | static void |
1273 | hppa_hpux_supply_ss_narrow (struct regcache *regcache, | |
1274 | int regnum, const char *save_state) | |
1275 | { | |
1276 | const char *ss_narrow = save_state + HPPA_HPUX_SS_NARROW_OFFSET; | |
1277 | int i, offset = 0; | |
1278 | ||
1279 | for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++) | |
1280 | { | |
1281 | if (regnum == i || regnum == -1) | |
1282 | regcache_raw_supply (regcache, i, ss_narrow + offset); | |
1283 | ||
1284 | offset += 4; | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | static void | |
1289 | hppa_hpux_supply_ss_fpblock (struct regcache *regcache, | |
1290 | int regnum, const char *save_state) | |
1291 | { | |
1292 | const char *ss_fpblock = save_state + HPPA_HPUX_SS_FPBLOCK_OFFSET; | |
1293 | int i, offset = 0; | |
1294 | ||
1295 | /* FIXME: We view the floating-point state as 64 single-precision | |
1296 | registers for 32-bit code, and 32 double-precision register for | |
1297 | 64-bit code. This distinction is artificial and should be | |
1298 | eliminated. If that ever happens, we should remove the if-clause | |
1299 | below. */ | |
1300 | ||
1301 | if (register_size (get_regcache_arch (regcache), HPPA_FP0_REGNUM) == 4) | |
1302 | { | |
1303 | for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 64; i++) | |
1304 | { | |
1305 | if (regnum == i || regnum == -1) | |
1306 | regcache_raw_supply (regcache, i, ss_fpblock + offset); | |
1307 | ||
1308 | offset += 4; | |
1309 | } | |
1310 | } | |
1311 | else | |
1312 | { | |
1313 | for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 32; i++) | |
1314 | { | |
1315 | if (regnum == i || regnum == -1) | |
1316 | regcache_raw_supply (regcache, i, ss_fpblock + offset); | |
1317 | ||
1318 | offset += 8; | |
1319 | } | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | static void | |
1324 | hppa_hpux_supply_ss_wide (struct regcache *regcache, | |
1325 | int regnum, const char *save_state) | |
1326 | { | |
1327 | const char *ss_wide = save_state + HPPA_HPUX_SS_WIDE_OFFSET; | |
1328 | int i, offset = 8; | |
1329 | ||
1330 | if (register_size (get_regcache_arch (regcache), HPPA_R1_REGNUM) == 4) | |
1331 | offset += 4; | |
1332 | ||
1333 | for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++) | |
1334 | { | |
1335 | if (regnum == i || regnum == -1) | |
1336 | regcache_raw_supply (regcache, i, ss_wide + offset); | |
1337 | ||
1338 | offset += 8; | |
1339 | } | |
1340 | } | |
1341 | ||
1342 | static void | |
1343 | hppa_hpux_supply_save_state (const struct regset *regset, | |
1344 | struct regcache *regcache, | |
1345 | int regnum, const void *regs, size_t len) | |
1346 | { | |
e17a4113 UW |
1347 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
1348 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
08d53055 MK |
1349 | const char *proc_info = regs; |
1350 | const char *save_state = proc_info + 8; | |
1351 | ULONGEST flags; | |
1352 | ||
e17a4113 UW |
1353 | flags = extract_unsigned_integer (save_state + HPPA_HPUX_SS_FLAGS_OFFSET, |
1354 | 4, byte_order); | |
08d53055 MK |
1355 | if (regnum == -1 || regnum == HPPA_FLAGS_REGNUM) |
1356 | { | |
e17a4113 | 1357 | size_t size = register_size (gdbarch, HPPA_FLAGS_REGNUM); |
08d53055 MK |
1358 | char buf[8]; |
1359 | ||
e17a4113 | 1360 | store_unsigned_integer (buf, size, byte_order, flags); |
08d53055 MK |
1361 | regcache_raw_supply (regcache, HPPA_FLAGS_REGNUM, buf); |
1362 | } | |
1363 | ||
1364 | /* If the SS_WIDEREGS flag is set, we really do need the full | |
1365 | `struct save_state'. */ | |
1366 | if (flags & HPPA_HPUX_SS_WIDEREGS && len < HPPA_HPUX_SAVE_STATE_SIZE) | |
8a3fe4f8 | 1367 | error (_("Register set contents too small")); |
08d53055 MK |
1368 | |
1369 | if (flags & HPPA_HPUX_SS_WIDEREGS) | |
1370 | hppa_hpux_supply_ss_wide (regcache, regnum, save_state); | |
1371 | else | |
1372 | hppa_hpux_supply_ss_narrow (regcache, regnum, save_state); | |
1373 | ||
1374 | hppa_hpux_supply_ss_fpblock (regcache, regnum, save_state); | |
1375 | } | |
1376 | ||
1377 | /* HP-UX register set. */ | |
1378 | ||
1379 | static struct regset hppa_hpux_regset = | |
1380 | { | |
1381 | NULL, | |
1382 | hppa_hpux_supply_save_state | |
1383 | }; | |
1384 | ||
1385 | static const struct regset * | |
1386 | hppa_hpux_regset_from_core_section (struct gdbarch *gdbarch, | |
1387 | const char *sect_name, size_t sect_size) | |
1388 | { | |
1389 | if (strcmp (sect_name, ".reg") == 0 | |
1390 | && sect_size >= HPPA_HPUX_PA89_SAVE_STATE_SIZE + 8) | |
1391 | return &hppa_hpux_regset; | |
1392 | ||
1393 | return NULL; | |
1394 | } | |
1395 | \f | |
1396 | ||
cc72850f MK |
1397 | /* Bit in the `ss_flag' member of `struct save_state' that indicates |
1398 | the state was saved from a system call. From | |
1399 | <machine/save_state.h>. */ | |
1400 | #define HPPA_HPUX_SS_INSYSCALL 0x02 | |
1401 | ||
1402 | static CORE_ADDR | |
61a1198a | 1403 | hppa_hpux_read_pc (struct regcache *regcache) |
cc72850f MK |
1404 | { |
1405 | ULONGEST flags; | |
1406 | ||
1407 | /* If we're currently in a system call return the contents of %r31. */ | |
61a1198a | 1408 | regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags); |
cc72850f | 1409 | if (flags & HPPA_HPUX_SS_INSYSCALL) |
61a1198a UW |
1410 | { |
1411 | ULONGEST pc; | |
1412 | regcache_cooked_read_unsigned (regcache, HPPA_R31_REGNUM, &pc); | |
1413 | return pc & ~0x3; | |
1414 | } | |
cc72850f | 1415 | |
61a1198a | 1416 | return hppa_read_pc (regcache); |
cc72850f MK |
1417 | } |
1418 | ||
1419 | static void | |
61a1198a | 1420 | hppa_hpux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
cc72850f MK |
1421 | { |
1422 | ULONGEST flags; | |
1423 | ||
1424 | /* If we're currently in a system call also write PC into %r31. */ | |
61a1198a | 1425 | regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags); |
cc72850f | 1426 | if (flags & HPPA_HPUX_SS_INSYSCALL) |
61a1198a | 1427 | regcache_cooked_write_unsigned (regcache, HPPA_R31_REGNUM, pc | 0x3); |
cc72850f | 1428 | |
e74994b5 | 1429 | hppa_write_pc (regcache, pc); |
cc72850f MK |
1430 | } |
1431 | ||
1432 | static CORE_ADDR | |
1433 | hppa_hpux_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
1434 | { | |
1435 | ULONGEST flags; | |
1436 | ||
1437 | /* If we're currently in a system call return the contents of %r31. */ | |
1438 | flags = frame_unwind_register_unsigned (next_frame, HPPA_FLAGS_REGNUM); | |
1439 | if (flags & HPPA_HPUX_SS_INSYSCALL) | |
1440 | return frame_unwind_register_unsigned (next_frame, HPPA_R31_REGNUM) & ~0x3; | |
1441 | ||
1442 | return hppa_unwind_pc (gdbarch, next_frame); | |
1443 | } | |
1444 | \f | |
c268433a | 1445 | |
f77a2124 RC |
1446 | /* Given the current value of the pc, check to see if it is inside a stub, and |
1447 | if so, change the value of the pc to point to the caller of the stub. | |
227e86ad | 1448 | THIS_FRAME is the current frame in the current list of frames. |
f77a2124 RC |
1449 | BASE contains to stack frame base of the current frame. |
1450 | SAVE_REGS is the register file stored in the frame cache. */ | |
1451 | static void | |
227e86ad | 1452 | hppa_hpux_unwind_adjust_stub (struct frame_info *this_frame, CORE_ADDR base, |
f77a2124 RC |
1453 | struct trad_frame_saved_reg *saved_regs) |
1454 | { | |
227e86ad | 1455 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
e17a4113 UW |
1456 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
1457 | int word_size = gdbarch_ptr_bit (gdbarch) / 8; | |
227e86ad JB |
1458 | struct value *pcoq_head_val; |
1459 | ULONGEST pcoq_head; | |
f77a2124 RC |
1460 | CORE_ADDR stubpc; |
1461 | struct unwind_table_entry *u; | |
1462 | ||
227e86ad JB |
1463 | pcoq_head_val = trad_frame_get_prev_register (this_frame, saved_regs, |
1464 | HPPA_PCOQ_HEAD_REGNUM); | |
1465 | pcoq_head = | |
1466 | extract_unsigned_integer (value_contents_all (pcoq_head_val), | |
e17a4113 UW |
1467 | register_size (gdbarch, HPPA_PCOQ_HEAD_REGNUM), |
1468 | byte_order); | |
f77a2124 | 1469 | |
227e86ad | 1470 | u = find_unwind_entry (pcoq_head); |
f77a2124 RC |
1471 | if (u && u->stub_unwind.stub_type == EXPORT) |
1472 | { | |
e17a4113 | 1473 | stubpc = read_memory_integer (base - 24, word_size, byte_order); |
f77a2124 RC |
1474 | trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc); |
1475 | } | |
1476 | else if (hppa_symbol_address ("__gcc_plt_call") | |
227e86ad | 1477 | == get_pc_function_start (pcoq_head)) |
f77a2124 | 1478 | { |
e17a4113 | 1479 | stubpc = read_memory_integer (base - 8, word_size, byte_order); |
f77a2124 RC |
1480 | trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc); |
1481 | } | |
1482 | } | |
1483 | ||
7d773d96 JB |
1484 | static void |
1485 | hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1486 | { | |
abc485a1 RC |
1487 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1488 | ||
77d18ded | 1489 | if (IS_32BIT_TARGET (gdbarch)) |
84674fe1 | 1490 | tdep->in_solib_call_trampoline = hppa32_hpux_in_solib_call_trampoline; |
abc485a1 | 1491 | else |
84674fe1 | 1492 | tdep->in_solib_call_trampoline = hppa64_hpux_in_solib_call_trampoline; |
abc485a1 | 1493 | |
f77a2124 RC |
1494 | tdep->unwind_adjust_stub = hppa_hpux_unwind_adjust_stub; |
1495 | ||
3cd36e7c MK |
1496 | set_gdbarch_in_solib_return_trampoline |
1497 | (gdbarch, hppa_hpux_in_solib_return_trampoline); | |
abc485a1 | 1498 | set_gdbarch_skip_trampoline_code (gdbarch, hppa_hpux_skip_trampoline_code); |
43613416 | 1499 | |
c268433a RC |
1500 | set_gdbarch_push_dummy_code (gdbarch, hppa_hpux_push_dummy_code); |
1501 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); | |
1502 | ||
cc72850f MK |
1503 | set_gdbarch_read_pc (gdbarch, hppa_hpux_read_pc); |
1504 | set_gdbarch_write_pc (gdbarch, hppa_hpux_write_pc); | |
1505 | set_gdbarch_unwind_pc (gdbarch, hppa_hpux_unwind_pc); | |
6d350bb5 UW |
1506 | set_gdbarch_skip_permanent_breakpoint |
1507 | (gdbarch, hppa_skip_permanent_breakpoint); | |
cc72850f | 1508 | |
08d53055 MK |
1509 | set_gdbarch_regset_from_core_section |
1510 | (gdbarch, hppa_hpux_regset_from_core_section); | |
1511 | ||
227e86ad | 1512 | frame_unwind_append_unwinder (gdbarch, &hppa_hpux_sigtramp_frame_unwind); |
7d773d96 | 1513 | } |
60e1ff27 | 1514 | |
273f8429 JB |
1515 | static void |
1516 | hppa_hpux_som_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1517 | { | |
fdd72f95 RC |
1518 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1519 | ||
1520 | tdep->is_elf = 0; | |
c268433a | 1521 | |
77d18ded RC |
1522 | tdep->find_global_pointer = hppa32_hpux_find_global_pointer; |
1523 | ||
7d773d96 | 1524 | hppa_hpux_init_abi (info, gdbarch); |
d542061a | 1525 | som_solib_select (gdbarch); |
273f8429 JB |
1526 | } |
1527 | ||
1528 | static void | |
1529 | hppa_hpux_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1530 | { | |
fdd72f95 RC |
1531 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1532 | ||
1533 | tdep->is_elf = 1; | |
77d18ded RC |
1534 | tdep->find_global_pointer = hppa64_hpux_find_global_pointer; |
1535 | ||
7d773d96 | 1536 | hppa_hpux_init_abi (info, gdbarch); |
d542061a | 1537 | pa64_solib_select (gdbarch); |
273f8429 JB |
1538 | } |
1539 | ||
08d53055 MK |
1540 | static enum gdb_osabi |
1541 | hppa_hpux_core_osabi_sniffer (bfd *abfd) | |
1542 | { | |
1543 | if (strcmp (bfd_get_target (abfd), "hpux-core") == 0) | |
1544 | return GDB_OSABI_HPUX_SOM; | |
6b79fde8 RC |
1545 | else if (strcmp (bfd_get_target (abfd), "elf64-hppa") == 0) |
1546 | { | |
1547 | asection *section; | |
1548 | ||
1549 | section = bfd_get_section_by_name (abfd, ".kernel"); | |
1550 | if (section) | |
1551 | { | |
1552 | bfd_size_type size; | |
1553 | char *contents; | |
1554 | ||
1555 | size = bfd_section_size (abfd, section); | |
1556 | contents = alloca (size); | |
1557 | if (bfd_get_section_contents (abfd, section, contents, | |
1558 | (file_ptr) 0, size) | |
1559 | && strcmp (contents, "HP-UX") == 0) | |
1560 | return GDB_OSABI_HPUX_ELF; | |
1561 | } | |
1562 | } | |
08d53055 MK |
1563 | |
1564 | return GDB_OSABI_UNKNOWN; | |
1565 | } | |
1566 | ||
273f8429 JB |
1567 | void |
1568 | _initialize_hppa_hpux_tdep (void) | |
1569 | { | |
08d53055 MK |
1570 | /* BFD doesn't set a flavour for HP-UX style core files. It doesn't |
1571 | set the architecture either. */ | |
1572 | gdbarch_register_osabi_sniffer (bfd_arch_unknown, | |
1573 | bfd_target_unknown_flavour, | |
1574 | hppa_hpux_core_osabi_sniffer); | |
6b79fde8 RC |
1575 | gdbarch_register_osabi_sniffer (bfd_arch_hppa, |
1576 | bfd_target_elf_flavour, | |
1577 | hppa_hpux_core_osabi_sniffer); | |
08d53055 | 1578 | |
05816f70 | 1579 | gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_HPUX_SOM, |
273f8429 | 1580 | hppa_hpux_som_init_abi); |
51db5742 | 1581 | gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_HPUX_ELF, |
273f8429 JB |
1582 | hppa_hpux_elf_init_abi); |
1583 | } |