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