| 1 | /* Native support for the SGI Iris running IRIX version 5, for GDB. |
| 2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU |
| 5 | and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. |
| 6 | Implemented for Irix 4.x by Garrett A. Wollman. |
| 7 | Modified for Irix 5.x by Ian Lance Taylor. |
| 8 | |
| 9 | This file is part of GDB. |
| 10 | |
| 11 | This program is free software; you can redistribute it and/or modify |
| 12 | it under the terms of the GNU General Public License as published by |
| 13 | the Free Software Foundation; either version 2 of the License, or |
| 14 | (at your option) any later version. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "inferior.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "target.h" |
| 29 | |
| 30 | #include "gdb_string.h" |
| 31 | #include <sys/time.h> |
| 32 | #include <sys/procfs.h> |
| 33 | #include <setjmp.h> /* For JB_XXX. */ |
| 34 | |
| 35 | static void |
| 36 | fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR)); |
| 37 | |
| 38 | /* Size of elements in jmpbuf */ |
| 39 | |
| 40 | #define JB_ELEMENT_SIZE 4 |
| 41 | |
| 42 | /* |
| 43 | * See the comment in m68k-tdep.c regarding the utility of these functions. |
| 44 | * |
| 45 | * These definitions are from the MIPS SVR4 ABI, so they may work for |
| 46 | * any MIPS SVR4 target. |
| 47 | */ |
| 48 | |
| 49 | void |
| 50 | supply_gregset (gregsetp) |
| 51 | gregset_t *gregsetp; |
| 52 | { |
| 53 | register int regi; |
| 54 | register greg_t *regp = &(*gregsetp)[0]; |
| 55 | int gregoff = sizeof (greg_t) - MIPS_REGSIZE; |
| 56 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
| 57 | |
| 58 | for(regi = 0; regi <= CTX_RA; regi++) |
| 59 | supply_register (regi, (char *)(regp + regi) + gregoff); |
| 60 | |
| 61 | supply_register (PC_REGNUM, (char *)(regp + CTX_EPC) + gregoff); |
| 62 | supply_register (HI_REGNUM, (char *)(regp + CTX_MDHI) + gregoff); |
| 63 | supply_register (LO_REGNUM, (char *)(regp + CTX_MDLO) + gregoff); |
| 64 | supply_register (CAUSE_REGNUM, (char *)(regp + CTX_CAUSE) + gregoff); |
| 65 | |
| 66 | /* Fill inaccessible registers with zero. */ |
| 67 | supply_register (BADVADDR_REGNUM, zerobuf); |
| 68 | } |
| 69 | |
| 70 | void |
| 71 | fill_gregset (gregsetp, regno) |
| 72 | gregset_t *gregsetp; |
| 73 | int regno; |
| 74 | { |
| 75 | int regi; |
| 76 | register greg_t *regp = &(*gregsetp)[0]; |
| 77 | |
| 78 | /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32 |
| 79 | executable, we have to sign extend the registers to 64 bits before |
| 80 | filling in the gregset structure. */ |
| 81 | |
| 82 | for (regi = 0; regi <= CTX_RA; regi++) |
| 83 | if ((regno == -1) || (regno == regi)) |
| 84 | *(regp + regi) = |
| 85 | extract_signed_integer (®isters[REGISTER_BYTE (regi)], |
| 86 | REGISTER_RAW_SIZE (regi)); |
| 87 | |
| 88 | if ((regno == -1) || (regno == PC_REGNUM)) |
| 89 | *(regp + CTX_EPC) = |
| 90 | extract_signed_integer (®isters[REGISTER_BYTE (PC_REGNUM)], |
| 91 | REGISTER_RAW_SIZE (PC_REGNUM)); |
| 92 | |
| 93 | if ((regno == -1) || (regno == CAUSE_REGNUM)) |
| 94 | *(regp + CTX_CAUSE) = |
| 95 | extract_signed_integer (®isters[REGISTER_BYTE (CAUSE_REGNUM)], |
| 96 | REGISTER_RAW_SIZE (CAUSE_REGNUM)); |
| 97 | |
| 98 | if ((regno == -1) || (regno == HI_REGNUM)) |
| 99 | *(regp + CTX_MDHI) = |
| 100 | extract_signed_integer (®isters[REGISTER_BYTE (HI_REGNUM)], |
| 101 | REGISTER_RAW_SIZE (HI_REGNUM)); |
| 102 | |
| 103 | if ((regno == -1) || (regno == LO_REGNUM)) |
| 104 | *(regp + CTX_MDLO) = |
| 105 | extract_signed_integer (®isters[REGISTER_BYTE (LO_REGNUM)], |
| 106 | REGISTER_RAW_SIZE (LO_REGNUM)); |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Now we do the same thing for floating-point registers. |
| 111 | * We don't bother to condition on FP0_REGNUM since any |
| 112 | * reasonable MIPS configuration has an R3010 in it. |
| 113 | * |
| 114 | * Again, see the comments in m68k-tdep.c. |
| 115 | */ |
| 116 | |
| 117 | void |
| 118 | supply_fpregset (fpregsetp) |
| 119 | fpregset_t *fpregsetp; |
| 120 | { |
| 121 | register int regi; |
| 122 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
| 123 | |
| 124 | /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ |
| 125 | |
| 126 | for (regi = 0; regi < 32; regi++) |
| 127 | supply_register (FP0_REGNUM + regi, |
| 128 | (char *)&fpregsetp->fp_r.fp_regs[regi]); |
| 129 | |
| 130 | supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr); |
| 131 | |
| 132 | /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */ |
| 133 | supply_register (FCRIR_REGNUM, zerobuf); |
| 134 | } |
| 135 | |
| 136 | void |
| 137 | fill_fpregset (fpregsetp, regno) |
| 138 | fpregset_t *fpregsetp; |
| 139 | int regno; |
| 140 | { |
| 141 | int regi; |
| 142 | char *from, *to; |
| 143 | |
| 144 | /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ |
| 145 | |
| 146 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) |
| 147 | { |
| 148 | if ((regno == -1) || (regno == regi)) |
| 149 | { |
| 150 | from = (char *) ®isters[REGISTER_BYTE (regi)]; |
| 151 | to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); |
| 152 | memcpy(to, from, REGISTER_RAW_SIZE (regi)); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | if ((regno == -1) || (regno == FCRCS_REGNUM)) |
| 157 | fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)]; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | /* Figure out where the longjmp will land. |
| 162 | We expect the first arg to be a pointer to the jmp_buf structure from which |
| 163 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| 164 | This routine returns true on success. */ |
| 165 | |
| 166 | int |
| 167 | get_longjmp_target (pc) |
| 168 | CORE_ADDR *pc; |
| 169 | { |
| 170 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; |
| 171 | CORE_ADDR jb_addr; |
| 172 | |
| 173 | jb_addr = read_register (A0_REGNUM); |
| 174 | |
| 175 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, |
| 176 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 177 | return 0; |
| 178 | |
| 179 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 180 | |
| 181 | return 1; |
| 182 | } |
| 183 | |
| 184 | static void |
| 185 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 186 | char *core_reg_sect; |
| 187 | unsigned core_reg_size; |
| 188 | int which; /* Unused */ |
| 189 | CORE_ADDR reg_addr; /* Unused */ |
| 190 | { |
| 191 | if (core_reg_size == REGISTER_BYTES) |
| 192 | { |
| 193 | memcpy ((char *)registers, core_reg_sect, core_reg_size); |
| 194 | } |
| 195 | else if (core_reg_size == (2 * REGISTER_BYTES) && MIPS_REGSIZE == 4) |
| 196 | { |
| 197 | /* This is a core file from a N32 executable, 64 bits are saved |
| 198 | for all registers. */ |
| 199 | char *srcp = core_reg_sect; |
| 200 | char *dstp = registers; |
| 201 | int regno; |
| 202 | |
| 203 | for (regno = 0; regno < NUM_REGS; regno++) |
| 204 | { |
| 205 | if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32)) |
| 206 | { |
| 207 | /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB |
| 208 | currently assumes that they are 32 bit. */ |
| 209 | *dstp++ = *srcp++; |
| 210 | *dstp++ = *srcp++; |
| 211 | *dstp++ = *srcp++; |
| 212 | *dstp++ = *srcp++; |
| 213 | srcp += 4; |
| 214 | } |
| 215 | else |
| 216 | { |
| 217 | srcp += 4; |
| 218 | *dstp++ = *srcp++; |
| 219 | *dstp++ = *srcp++; |
| 220 | *dstp++ = *srcp++; |
| 221 | *dstp++ = *srcp++; |
| 222 | } |
| 223 | } |
| 224 | } |
| 225 | else |
| 226 | { |
| 227 | warning ("wrong size gregset struct in core file"); |
| 228 | return; |
| 229 | } |
| 230 | |
| 231 | registers_fetched (); |
| 232 | } |
| 233 | \f |
| 234 | /* Irix 5 uses what appears to be a unique form of shared library |
| 235 | support. This is a copy of solib.c modified for Irix 5. */ |
| 236 | /* FIXME: Most of this code could be merged with osfsolib.c and solib.c |
| 237 | by using next_link_map_member and xfer_link_map_member in solib.c. */ |
| 238 | |
| 239 | #include <sys/types.h> |
| 240 | #include <signal.h> |
| 241 | #include <sys/param.h> |
| 242 | #include <fcntl.h> |
| 243 | |
| 244 | /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts |
| 245 | with our versions of those files included by tm-mips.h. Prevent |
| 246 | <obj.h> from including them with some appropriate defines. */ |
| 247 | #define __SYM_H__ |
| 248 | #define __SYMCONST_H__ |
| 249 | #include <obj.h> |
| 250 | #ifdef HAVE_OBJLIST_H |
| 251 | #include <objlist.h> |
| 252 | #endif |
| 253 | |
| 254 | #ifdef NEW_OBJ_INFO_MAGIC |
| 255 | #define HANDLE_NEW_OBJ_LIST |
| 256 | #endif |
| 257 | |
| 258 | #include "symtab.h" |
| 259 | #include "bfd.h" |
| 260 | #include "symfile.h" |
| 261 | #include "objfiles.h" |
| 262 | #include "command.h" |
| 263 | #include "frame.h" |
| 264 | #include "gnu-regex.h" |
| 265 | #include "inferior.h" |
| 266 | #include "language.h" |
| 267 | #include "gdbcmd.h" |
| 268 | |
| 269 | /* The symbol which starts off the list of shared libraries. */ |
| 270 | #define DEBUG_BASE "__rld_obj_head" |
| 271 | |
| 272 | /* Irix 6.x introduces a new variant of object lists. |
| 273 | To be able to debug O32 executables under Irix 6, we have to handle both |
| 274 | variants. */ |
| 275 | |
| 276 | typedef enum |
| 277 | { |
| 278 | OBJ_LIST_OLD, /* Pre Irix 6.x object list. */ |
| 279 | OBJ_LIST_32, /* 32 Bit Elf32_Obj_Info. */ |
| 280 | OBJ_LIST_64 /* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */ |
| 281 | } obj_list_variant; |
| 282 | |
| 283 | /* Define our own link_map structure. |
| 284 | This will help to share code with osfsolib.c and solib.c. */ |
| 285 | |
| 286 | struct link_map { |
| 287 | obj_list_variant l_variant; /* which variant of object list */ |
| 288 | CORE_ADDR l_lladdr; /* addr in inferior list was read from */ |
| 289 | CORE_ADDR l_next; /* address of next object list entry */ |
| 290 | }; |
| 291 | |
| 292 | /* Irix 5 shared objects are pre-linked to particular addresses |
| 293 | although the dynamic linker may have to relocate them if the |
| 294 | address ranges of the libraries used by the main program clash. |
| 295 | The offset is the difference between the address where the object |
| 296 | is mapped and the binding address of the shared library. */ |
| 297 | #define LM_OFFSET(so) ((so) -> offset) |
| 298 | /* Loaded address of shared library. */ |
| 299 | #define LM_ADDR(so) ((so) -> lmstart) |
| 300 | |
| 301 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
| 302 | |
| 303 | struct so_list { |
| 304 | struct so_list *next; /* next structure in linked list */ |
| 305 | struct link_map lm; |
| 306 | CORE_ADDR offset; /* prelink to load address offset */ |
| 307 | char *so_name; /* shared object lib name */ |
| 308 | CORE_ADDR lmstart; /* lower addr bound of mapped object */ |
| 309 | CORE_ADDR lmend; /* upper addr bound of mapped object */ |
| 310 | char symbols_loaded; /* flag: symbols read in yet? */ |
| 311 | char from_tty; /* flag: print msgs? */ |
| 312 | struct objfile *objfile; /* objfile for loaded lib */ |
| 313 | struct section_table *sections; |
| 314 | struct section_table *sections_end; |
| 315 | struct section_table *textsection; |
| 316 | bfd *abfd; |
| 317 | }; |
| 318 | |
| 319 | static struct so_list *so_list_head; /* List of known shared objects */ |
| 320 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
| 321 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ |
| 322 | |
| 323 | /* Local function prototypes */ |
| 324 | |
| 325 | static void |
| 326 | sharedlibrary_command PARAMS ((char *, int)); |
| 327 | |
| 328 | static int |
| 329 | enable_break PARAMS ((void)); |
| 330 | |
| 331 | static int |
| 332 | disable_break PARAMS ((void)); |
| 333 | |
| 334 | static void |
| 335 | info_sharedlibrary_command PARAMS ((char *, int)); |
| 336 | |
| 337 | static int |
| 338 | symbol_add_stub PARAMS ((char *)); |
| 339 | |
| 340 | static struct so_list * |
| 341 | find_solib PARAMS ((struct so_list *)); |
| 342 | |
| 343 | static struct link_map * |
| 344 | first_link_map_member PARAMS ((void)); |
| 345 | |
| 346 | static struct link_map * |
| 347 | next_link_map_member PARAMS ((struct so_list *)); |
| 348 | |
| 349 | static void |
| 350 | xfer_link_map_member PARAMS ((struct so_list *, struct link_map *)); |
| 351 | |
| 352 | static CORE_ADDR |
| 353 | locate_base PARAMS ((void)); |
| 354 | |
| 355 | static void |
| 356 | solib_map_sections PARAMS ((struct so_list *)); |
| 357 | |
| 358 | /* |
| 359 | |
| 360 | LOCAL FUNCTION |
| 361 | |
| 362 | solib_map_sections -- open bfd and build sections for shared lib |
| 363 | |
| 364 | SYNOPSIS |
| 365 | |
| 366 | static void solib_map_sections (struct so_list *so) |
| 367 | |
| 368 | DESCRIPTION |
| 369 | |
| 370 | Given a pointer to one of the shared objects in our list |
| 371 | of mapped objects, use the recorded name to open a bfd |
| 372 | descriptor for the object, build a section table, and then |
| 373 | relocate all the section addresses by the base address at |
| 374 | which the shared object was mapped. |
| 375 | |
| 376 | FIXMES |
| 377 | |
| 378 | In most (all?) cases the shared object file name recorded in the |
| 379 | dynamic linkage tables will be a fully qualified pathname. For |
| 380 | cases where it isn't, do we really mimic the systems search |
| 381 | mechanism correctly in the below code (particularly the tilde |
| 382 | expansion stuff?). |
| 383 | */ |
| 384 | |
| 385 | static void |
| 386 | solib_map_sections (so) |
| 387 | struct so_list *so; |
| 388 | { |
| 389 | char *filename; |
| 390 | char *scratch_pathname; |
| 391 | int scratch_chan; |
| 392 | struct section_table *p; |
| 393 | struct cleanup *old_chain; |
| 394 | bfd *abfd; |
| 395 | |
| 396 | filename = tilde_expand (so -> so_name); |
| 397 | old_chain = make_cleanup (free, filename); |
| 398 | |
| 399 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
| 400 | &scratch_pathname); |
| 401 | if (scratch_chan < 0) |
| 402 | { |
| 403 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, |
| 404 | O_RDONLY, 0, &scratch_pathname); |
| 405 | } |
| 406 | if (scratch_chan < 0) |
| 407 | { |
| 408 | perror_with_name (filename); |
| 409 | } |
| 410 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ |
| 411 | |
| 412 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
| 413 | if (!abfd) |
| 414 | { |
| 415 | close (scratch_chan); |
| 416 | error ("Could not open `%s' as an executable file: %s", |
| 417 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 418 | } |
| 419 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
| 420 | so -> abfd = abfd; |
| 421 | abfd -> cacheable = true; |
| 422 | |
| 423 | if (!bfd_check_format (abfd, bfd_object)) |
| 424 | { |
| 425 | error ("\"%s\": not in executable format: %s.", |
| 426 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 427 | } |
| 428 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) |
| 429 | { |
| 430 | error ("Can't find the file sections in `%s': %s", |
| 431 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
| 432 | } |
| 433 | |
| 434 | for (p = so -> sections; p < so -> sections_end; p++) |
| 435 | { |
| 436 | /* Relocate the section binding addresses as recorded in the shared |
| 437 | object's file by the offset to get the address to which the |
| 438 | object was actually mapped. */ |
| 439 | p -> addr += LM_OFFSET (so); |
| 440 | p -> endaddr += LM_OFFSET (so); |
| 441 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); |
| 442 | if (STREQ (p -> the_bfd_section -> name, ".text")) |
| 443 | { |
| 444 | so -> textsection = p; |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | /* Free the file names, close the file now. */ |
| 449 | do_cleanups (old_chain); |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | |
| 454 | LOCAL FUNCTION |
| 455 | |
| 456 | locate_base -- locate the base address of dynamic linker structs |
| 457 | |
| 458 | SYNOPSIS |
| 459 | |
| 460 | CORE_ADDR locate_base (void) |
| 461 | |
| 462 | DESCRIPTION |
| 463 | |
| 464 | For both the SunOS and SVR4 shared library implementations, if the |
| 465 | inferior executable has been linked dynamically, there is a single |
| 466 | address somewhere in the inferior's data space which is the key to |
| 467 | locating all of the dynamic linker's runtime structures. This |
| 468 | address is the value of the symbol defined by the macro DEBUG_BASE. |
| 469 | The job of this function is to find and return that address, or to |
| 470 | return 0 if there is no such address (the executable is statically |
| 471 | linked for example). |
| 472 | |
| 473 | For SunOS, the job is almost trivial, since the dynamic linker and |
| 474 | all of it's structures are statically linked to the executable at |
| 475 | link time. Thus the symbol for the address we are looking for has |
| 476 | already been added to the minimal symbol table for the executable's |
| 477 | objfile at the time the symbol file's symbols were read, and all we |
| 478 | have to do is look it up there. Note that we explicitly do NOT want |
| 479 | to find the copies in the shared library. |
| 480 | |
| 481 | The SVR4 version is much more complicated because the dynamic linker |
| 482 | and it's structures are located in the shared C library, which gets |
| 483 | run as the executable's "interpreter" by the kernel. We have to go |
| 484 | to a lot more work to discover the address of DEBUG_BASE. Because |
| 485 | of this complexity, we cache the value we find and return that value |
| 486 | on subsequent invocations. Note there is no copy in the executable |
| 487 | symbol tables. |
| 488 | |
| 489 | Irix 5 is basically like SunOS. |
| 490 | |
| 491 | Note that we can assume nothing about the process state at the time |
| 492 | we need to find this address. We may be stopped on the first instruc- |
| 493 | tion of the interpreter (C shared library), the first instruction of |
| 494 | the executable itself, or somewhere else entirely (if we attached |
| 495 | to the process for example). |
| 496 | |
| 497 | */ |
| 498 | |
| 499 | static CORE_ADDR |
| 500 | locate_base () |
| 501 | { |
| 502 | struct minimal_symbol *msymbol; |
| 503 | CORE_ADDR address = 0; |
| 504 | |
| 505 | msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile); |
| 506 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
| 507 | { |
| 508 | address = SYMBOL_VALUE_ADDRESS (msymbol); |
| 509 | } |
| 510 | return (address); |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | |
| 515 | LOCAL FUNCTION |
| 516 | |
| 517 | first_link_map_member -- locate first member in dynamic linker's map |
| 518 | |
| 519 | SYNOPSIS |
| 520 | |
| 521 | static struct link_map *first_link_map_member (void) |
| 522 | |
| 523 | DESCRIPTION |
| 524 | |
| 525 | Read in a copy of the first member in the inferior's dynamic |
| 526 | link map from the inferior's dynamic linker structures, and return |
| 527 | a pointer to the link map descriptor. |
| 528 | */ |
| 529 | |
| 530 | static struct link_map * |
| 531 | first_link_map_member () |
| 532 | { |
| 533 | struct obj_list *listp; |
| 534 | struct obj_list list_old; |
| 535 | struct link_map *lm; |
| 536 | static struct link_map first_lm; |
| 537 | CORE_ADDR lladdr; |
| 538 | CORE_ADDR next_lladdr; |
| 539 | |
| 540 | /* We have not already read in the dynamic linking structures |
| 541 | from the inferior, lookup the address of the base structure. */ |
| 542 | debug_base = locate_base (); |
| 543 | if (debug_base == 0) |
| 544 | return NULL; |
| 545 | |
| 546 | /* Get address of first list entry. */ |
| 547 | read_memory (debug_base, (char *) &listp, sizeof (struct obj_list *)); |
| 548 | |
| 549 | if (listp == NULL) |
| 550 | return NULL; |
| 551 | |
| 552 | /* Get first list entry. */ |
| 553 | lladdr = (CORE_ADDR) listp; |
| 554 | read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); |
| 555 | |
| 556 | /* The first entry in the list is the object file we are debugging, |
| 557 | so skip it. */ |
| 558 | next_lladdr = (CORE_ADDR) list_old.next; |
| 559 | |
| 560 | #ifdef HANDLE_NEW_OBJ_LIST |
| 561 | if (list_old.data == NEW_OBJ_INFO_MAGIC) |
| 562 | { |
| 563 | Elf32_Obj_Info list_32; |
| 564 | |
| 565 | read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); |
| 566 | if (list_32.oi_size != sizeof (Elf32_Obj_Info)) |
| 567 | return NULL; |
| 568 | next_lladdr = (CORE_ADDR) list_32.oi_next; |
| 569 | } |
| 570 | #endif |
| 571 | |
| 572 | if (next_lladdr == 0) |
| 573 | return NULL; |
| 574 | |
| 575 | first_lm.l_lladdr = next_lladdr; |
| 576 | lm = &first_lm; |
| 577 | return lm; |
| 578 | } |
| 579 | |
| 580 | /* |
| 581 | |
| 582 | LOCAL FUNCTION |
| 583 | |
| 584 | next_link_map_member -- locate next member in dynamic linker's map |
| 585 | |
| 586 | SYNOPSIS |
| 587 | |
| 588 | static struct link_map *next_link_map_member (so_list_ptr) |
| 589 | |
| 590 | DESCRIPTION |
| 591 | |
| 592 | Read in a copy of the next member in the inferior's dynamic |
| 593 | link map from the inferior's dynamic linker structures, and return |
| 594 | a pointer to the link map descriptor. |
| 595 | */ |
| 596 | |
| 597 | static struct link_map * |
| 598 | next_link_map_member (so_list_ptr) |
| 599 | struct so_list *so_list_ptr; |
| 600 | { |
| 601 | struct link_map *lm = &so_list_ptr -> lm; |
| 602 | CORE_ADDR next_lladdr = lm -> l_next; |
| 603 | static struct link_map next_lm; |
| 604 | |
| 605 | if (next_lladdr == 0) |
| 606 | { |
| 607 | /* We have hit the end of the list, so check to see if any were |
| 608 | added, but be quiet if we can't read from the target any more. */ |
| 609 | int status = 0; |
| 610 | |
| 611 | if (lm -> l_variant == OBJ_LIST_OLD) |
| 612 | { |
| 613 | struct obj_list list_old; |
| 614 | |
| 615 | status = target_read_memory (lm -> l_lladdr, |
| 616 | (char *) &list_old, |
| 617 | sizeof (struct obj_list)); |
| 618 | next_lladdr = (CORE_ADDR) list_old.next; |
| 619 | } |
| 620 | #ifdef HANDLE_NEW_OBJ_LIST |
| 621 | else if (lm -> l_variant == OBJ_LIST_32) |
| 622 | { |
| 623 | Elf32_Obj_Info list_32; |
| 624 | status = target_read_memory (lm -> l_lladdr, |
| 625 | (char *) &list_32, |
| 626 | sizeof (Elf32_Obj_Info)); |
| 627 | next_lladdr = (CORE_ADDR) list_32.oi_next; |
| 628 | } |
| 629 | #endif |
| 630 | |
| 631 | if (status != 0 || next_lladdr == 0) |
| 632 | return NULL; |
| 633 | } |
| 634 | |
| 635 | next_lm.l_lladdr = next_lladdr; |
| 636 | lm = &next_lm; |
| 637 | return lm; |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | |
| 642 | LOCAL FUNCTION |
| 643 | |
| 644 | xfer_link_map_member -- set local variables from dynamic linker's map |
| 645 | |
| 646 | SYNOPSIS |
| 647 | |
| 648 | static void xfer_link_map_member (so_list_ptr, lm) |
| 649 | |
| 650 | DESCRIPTION |
| 651 | |
| 652 | Read in a copy of the requested member in the inferior's dynamic |
| 653 | link map from the inferior's dynamic linker structures, and fill |
| 654 | in the necessary so_list_ptr elements. |
| 655 | */ |
| 656 | |
| 657 | static void |
| 658 | xfer_link_map_member (so_list_ptr, lm) |
| 659 | struct so_list *so_list_ptr; |
| 660 | struct link_map *lm; |
| 661 | { |
| 662 | struct obj_list list_old; |
| 663 | CORE_ADDR lladdr = lm -> l_lladdr; |
| 664 | struct link_map *new_lm = &so_list_ptr -> lm; |
| 665 | int errcode; |
| 666 | |
| 667 | read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); |
| 668 | |
| 669 | new_lm -> l_variant = OBJ_LIST_OLD; |
| 670 | new_lm -> l_lladdr = lladdr; |
| 671 | new_lm -> l_next = (CORE_ADDR) list_old.next; |
| 672 | |
| 673 | #ifdef HANDLE_NEW_OBJ_LIST |
| 674 | if (list_old.data == NEW_OBJ_INFO_MAGIC) |
| 675 | { |
| 676 | Elf32_Obj_Info list_32; |
| 677 | |
| 678 | read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); |
| 679 | if (list_32.oi_size != sizeof (Elf32_Obj_Info)) |
| 680 | return; |
| 681 | new_lm -> l_variant = OBJ_LIST_32; |
| 682 | new_lm -> l_next = (CORE_ADDR) list_32.oi_next; |
| 683 | |
| 684 | target_read_string ((CORE_ADDR) list_32.oi_pathname, |
| 685 | &so_list_ptr -> so_name, |
| 686 | list_32.oi_pathname_len + 1, &errcode); |
| 687 | if (errcode != 0) |
| 688 | memory_error (errcode, (CORE_ADDR) list_32.oi_pathname); |
| 689 | |
| 690 | LM_ADDR (so_list_ptr) = (CORE_ADDR) list_32.oi_ehdr; |
| 691 | LM_OFFSET (so_list_ptr) = |
| 692 | (CORE_ADDR) list_32.oi_ehdr - (CORE_ADDR) list_32.oi_orig_ehdr; |
| 693 | } |
| 694 | else |
| 695 | #endif |
| 696 | { |
| 697 | #if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32 |
| 698 | /* If we are compiling GDB under N32 ABI, the alignments in |
| 699 | the obj struct are different from the O32 ABI and we will get |
| 700 | wrong values when accessing the struct. |
| 701 | As a workaround we use fixed values which are good for |
| 702 | Irix 6.2. */ |
| 703 | char buf[432]; |
| 704 | |
| 705 | read_memory ((CORE_ADDR) list_old.data, buf, sizeof (buf)); |
| 706 | |
| 707 | target_read_string (extract_address (&buf[236], 4), |
| 708 | &so_list_ptr -> so_name, |
| 709 | INT_MAX, &errcode); |
| 710 | if (errcode != 0) |
| 711 | memory_error (errcode, extract_address (&buf[236], 4)); |
| 712 | |
| 713 | LM_ADDR (so_list_ptr) = extract_address (&buf[196], 4); |
| 714 | LM_OFFSET (so_list_ptr) = |
| 715 | extract_address (&buf[196], 4) - extract_address (&buf[248], 4); |
| 716 | #else |
| 717 | struct obj obj_old; |
| 718 | |
| 719 | read_memory ((CORE_ADDR) list_old.data, (char *) &obj_old, |
| 720 | sizeof (struct obj)); |
| 721 | |
| 722 | target_read_string ((CORE_ADDR) obj_old.o_path, |
| 723 | &so_list_ptr -> so_name, |
| 724 | INT_MAX, &errcode); |
| 725 | if (errcode != 0) |
| 726 | memory_error (errcode, (CORE_ADDR) obj_old.o_path); |
| 727 | |
| 728 | LM_ADDR (so_list_ptr) = (CORE_ADDR) obj_old.o_praw; |
| 729 | LM_OFFSET (so_list_ptr) = |
| 730 | (CORE_ADDR) obj_old.o_praw - obj_old.o_base_address; |
| 731 | #endif |
| 732 | } |
| 733 | |
| 734 | solib_map_sections (so_list_ptr); |
| 735 | } |
| 736 | |
| 737 | |
| 738 | /* |
| 739 | |
| 740 | LOCAL FUNCTION |
| 741 | |
| 742 | find_solib -- step through list of shared objects |
| 743 | |
| 744 | SYNOPSIS |
| 745 | |
| 746 | struct so_list *find_solib (struct so_list *so_list_ptr) |
| 747 | |
| 748 | DESCRIPTION |
| 749 | |
| 750 | This module contains the routine which finds the names of any |
| 751 | loaded "images" in the current process. The argument in must be |
| 752 | NULL on the first call, and then the returned value must be passed |
| 753 | in on subsequent calls. This provides the capability to "step" down |
| 754 | the list of loaded objects. On the last object, a NULL value is |
| 755 | returned. |
| 756 | */ |
| 757 | |
| 758 | static struct so_list * |
| 759 | find_solib (so_list_ptr) |
| 760 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ |
| 761 | { |
| 762 | struct so_list *so_list_next = NULL; |
| 763 | struct link_map *lm = NULL; |
| 764 | struct so_list *new; |
| 765 | |
| 766 | if (so_list_ptr == NULL) |
| 767 | { |
| 768 | /* We are setting up for a new scan through the loaded images. */ |
| 769 | if ((so_list_next = so_list_head) == NULL) |
| 770 | { |
| 771 | /* Find the first link map list member. */ |
| 772 | lm = first_link_map_member (); |
| 773 | } |
| 774 | } |
| 775 | else |
| 776 | { |
| 777 | /* We have been called before, and are in the process of walking |
| 778 | the shared library list. Advance to the next shared object. */ |
| 779 | lm = next_link_map_member (so_list_ptr); |
| 780 | so_list_next = so_list_ptr -> next; |
| 781 | } |
| 782 | if ((so_list_next == NULL) && (lm != NULL)) |
| 783 | { |
| 784 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 785 | memset ((char *) new, 0, sizeof (struct so_list)); |
| 786 | /* Add the new node as the next node in the list, or as the root |
| 787 | node if this is the first one. */ |
| 788 | if (so_list_ptr != NULL) |
| 789 | { |
| 790 | so_list_ptr -> next = new; |
| 791 | } |
| 792 | else |
| 793 | { |
| 794 | so_list_head = new; |
| 795 | } |
| 796 | so_list_next = new; |
| 797 | xfer_link_map_member (new, lm); |
| 798 | } |
| 799 | return (so_list_next); |
| 800 | } |
| 801 | |
| 802 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
| 803 | |
| 804 | static int |
| 805 | symbol_add_stub (arg) |
| 806 | char *arg; |
| 807 | { |
| 808 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
| 809 | CORE_ADDR text_addr = 0; |
| 810 | |
| 811 | if (so -> textsection) |
| 812 | text_addr = so -> textsection -> addr; |
| 813 | else |
| 814 | { |
| 815 | asection *lowest_sect; |
| 816 | |
| 817 | /* If we didn't find a mapped non zero sized .text section, set up |
| 818 | text_addr so that the relocation in symbol_file_add does no harm. */ |
| 819 | |
| 820 | lowest_sect = bfd_get_section_by_name (so -> abfd, ".text"); |
| 821 | if (lowest_sect == NULL) |
| 822 | bfd_map_over_sections (so -> abfd, find_lowest_section, |
| 823 | (PTR) &lowest_sect); |
| 824 | if (lowest_sect) |
| 825 | text_addr = bfd_section_vma (so -> abfd, lowest_sect) + LM_OFFSET (so); |
| 826 | } |
| 827 | |
| 828 | so -> objfile = symbol_file_add (so -> so_name, so -> from_tty, |
| 829 | text_addr, |
| 830 | 0, 0, 0); |
| 831 | return (1); |
| 832 | } |
| 833 | |
| 834 | /* |
| 835 | |
| 836 | GLOBAL FUNCTION |
| 837 | |
| 838 | solib_add -- add a shared library file to the symtab and section list |
| 839 | |
| 840 | SYNOPSIS |
| 841 | |
| 842 | void solib_add (char *arg_string, int from_tty, |
| 843 | struct target_ops *target) |
| 844 | |
| 845 | DESCRIPTION |
| 846 | |
| 847 | */ |
| 848 | |
| 849 | void |
| 850 | solib_add (arg_string, from_tty, target) |
| 851 | char *arg_string; |
| 852 | int from_tty; |
| 853 | struct target_ops *target; |
| 854 | { |
| 855 | register struct so_list *so = NULL; /* link map state variable */ |
| 856 | |
| 857 | /* Last shared library that we read. */ |
| 858 | struct so_list *so_last = NULL; |
| 859 | |
| 860 | char *re_err; |
| 861 | int count; |
| 862 | int old; |
| 863 | |
| 864 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
| 865 | { |
| 866 | error ("Invalid regexp: %s", re_err); |
| 867 | } |
| 868 | |
| 869 | /* Add the shared library sections to the section table of the |
| 870 | specified target, if any. */ |
| 871 | if (target) |
| 872 | { |
| 873 | /* Count how many new section_table entries there are. */ |
| 874 | so = NULL; |
| 875 | count = 0; |
| 876 | while ((so = find_solib (so)) != NULL) |
| 877 | { |
| 878 | if (so -> so_name[0]) |
| 879 | { |
| 880 | count += so -> sections_end - so -> sections; |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | if (count) |
| 885 | { |
| 886 | int update_coreops; |
| 887 | |
| 888 | /* We must update the to_sections field in the core_ops structure |
| 889 | here, otherwise we dereference a potential dangling pointer |
| 890 | for each call to target_read/write_memory within this routine. */ |
| 891 | update_coreops = core_ops.to_sections == target->to_sections; |
| 892 | |
| 893 | /* Reallocate the target's section table including the new size. */ |
| 894 | if (target -> to_sections) |
| 895 | { |
| 896 | old = target -> to_sections_end - target -> to_sections; |
| 897 | target -> to_sections = (struct section_table *) |
| 898 | xrealloc ((char *)target -> to_sections, |
| 899 | (sizeof (struct section_table)) * (count + old)); |
| 900 | } |
| 901 | else |
| 902 | { |
| 903 | old = 0; |
| 904 | target -> to_sections = (struct section_table *) |
| 905 | xmalloc ((sizeof (struct section_table)) * count); |
| 906 | } |
| 907 | target -> to_sections_end = target -> to_sections + (count + old); |
| 908 | |
| 909 | /* Update the to_sections field in the core_ops structure |
| 910 | if needed. */ |
| 911 | if (update_coreops) |
| 912 | { |
| 913 | core_ops.to_sections = target->to_sections; |
| 914 | core_ops.to_sections_end = target->to_sections_end; |
| 915 | } |
| 916 | |
| 917 | /* Add these section table entries to the target's table. */ |
| 918 | while ((so = find_solib (so)) != NULL) |
| 919 | { |
| 920 | if (so -> so_name[0]) |
| 921 | { |
| 922 | count = so -> sections_end - so -> sections; |
| 923 | memcpy ((char *) (target -> to_sections + old), |
| 924 | so -> sections, |
| 925 | (sizeof (struct section_table)) * count); |
| 926 | old += count; |
| 927 | } |
| 928 | } |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | /* Now add the symbol files. */ |
| 933 | while ((so = find_solib (so)) != NULL) |
| 934 | { |
| 935 | if (so -> so_name[0] && re_exec (so -> so_name)) |
| 936 | { |
| 937 | so -> from_tty = from_tty; |
| 938 | if (so -> symbols_loaded) |
| 939 | { |
| 940 | if (from_tty) |
| 941 | { |
| 942 | printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); |
| 943 | } |
| 944 | } |
| 945 | else if (catch_errors |
| 946 | (symbol_add_stub, (char *) so, |
| 947 | "Error while reading shared library symbols:\n", |
| 948 | RETURN_MASK_ALL)) |
| 949 | { |
| 950 | so_last = so; |
| 951 | so -> symbols_loaded = 1; |
| 952 | } |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | /* Getting new symbols may change our opinion about what is |
| 957 | frameless. */ |
| 958 | if (so_last) |
| 959 | reinit_frame_cache (); |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | |
| 964 | LOCAL FUNCTION |
| 965 | |
| 966 | info_sharedlibrary_command -- code for "info sharedlibrary" |
| 967 | |
| 968 | SYNOPSIS |
| 969 | |
| 970 | static void info_sharedlibrary_command () |
| 971 | |
| 972 | DESCRIPTION |
| 973 | |
| 974 | Walk through the shared library list and print information |
| 975 | about each attached library. |
| 976 | */ |
| 977 | |
| 978 | static void |
| 979 | info_sharedlibrary_command (ignore, from_tty) |
| 980 | char *ignore; |
| 981 | int from_tty; |
| 982 | { |
| 983 | register struct so_list *so = NULL; /* link map state variable */ |
| 984 | int header_done = 0; |
| 985 | |
| 986 | if (exec_bfd == NULL) |
| 987 | { |
| 988 | printf_unfiltered ("No exec file.\n"); |
| 989 | return; |
| 990 | } |
| 991 | while ((so = find_solib (so)) != NULL) |
| 992 | { |
| 993 | if (so -> so_name[0]) |
| 994 | { |
| 995 | if (!header_done) |
| 996 | { |
| 997 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", |
| 998 | "Shared Object Library"); |
| 999 | header_done++; |
| 1000 | } |
| 1001 | printf_unfiltered ("%-12s", |
| 1002 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
| 1003 | "08l")); |
| 1004 | printf_unfiltered ("%-12s", |
| 1005 | local_hex_string_custom ((unsigned long) so -> lmend, |
| 1006 | "08l")); |
| 1007 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); |
| 1008 | printf_unfiltered ("%s\n", so -> so_name); |
| 1009 | } |
| 1010 | } |
| 1011 | if (so_list_head == NULL) |
| 1012 | { |
| 1013 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | /* |
| 1018 | |
| 1019 | GLOBAL FUNCTION |
| 1020 | |
| 1021 | solib_address -- check to see if an address is in a shared lib |
| 1022 | |
| 1023 | SYNOPSIS |
| 1024 | |
| 1025 | char *solib_address (CORE_ADDR address) |
| 1026 | |
| 1027 | DESCRIPTION |
| 1028 | |
| 1029 | Provides a hook for other gdb routines to discover whether or |
| 1030 | not a particular address is within the mapped address space of |
| 1031 | a shared library. Any address between the base mapping address |
| 1032 | and the first address beyond the end of the last mapping, is |
| 1033 | considered to be within the shared library address space, for |
| 1034 | our purposes. |
| 1035 | |
| 1036 | For example, this routine is called at one point to disable |
| 1037 | breakpoints which are in shared libraries that are not currently |
| 1038 | mapped in. |
| 1039 | */ |
| 1040 | |
| 1041 | char * |
| 1042 | solib_address (address) |
| 1043 | CORE_ADDR address; |
| 1044 | { |
| 1045 | register struct so_list *so = 0; /* link map state variable */ |
| 1046 | |
| 1047 | while ((so = find_solib (so)) != NULL) |
| 1048 | { |
| 1049 | if (so -> so_name[0]) |
| 1050 | { |
| 1051 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && |
| 1052 | (address < (CORE_ADDR) so -> lmend)) |
| 1053 | return (so->so_name); |
| 1054 | } |
| 1055 | } |
| 1056 | return (0); |
| 1057 | } |
| 1058 | |
| 1059 | /* Called by free_all_symtabs */ |
| 1060 | |
| 1061 | void |
| 1062 | clear_solib() |
| 1063 | { |
| 1064 | struct so_list *next; |
| 1065 | char *bfd_filename; |
| 1066 | |
| 1067 | while (so_list_head) |
| 1068 | { |
| 1069 | if (so_list_head -> sections) |
| 1070 | { |
| 1071 | free ((PTR)so_list_head -> sections); |
| 1072 | } |
| 1073 | if (so_list_head -> abfd) |
| 1074 | { |
| 1075 | bfd_filename = bfd_get_filename (so_list_head -> abfd); |
| 1076 | if (!bfd_close (so_list_head -> abfd)) |
| 1077 | warning ("cannot close \"%s\": %s", |
| 1078 | bfd_filename, bfd_errmsg (bfd_get_error ())); |
| 1079 | } |
| 1080 | else |
| 1081 | /* This happens for the executable on SVR4. */ |
| 1082 | bfd_filename = NULL; |
| 1083 | |
| 1084 | next = so_list_head -> next; |
| 1085 | if (bfd_filename) |
| 1086 | free ((PTR)bfd_filename); |
| 1087 | free (so_list_head->so_name); |
| 1088 | free ((PTR)so_list_head); |
| 1089 | so_list_head = next; |
| 1090 | } |
| 1091 | debug_base = 0; |
| 1092 | } |
| 1093 | |
| 1094 | /* |
| 1095 | |
| 1096 | LOCAL FUNCTION |
| 1097 | |
| 1098 | disable_break -- remove the "mapping changed" breakpoint |
| 1099 | |
| 1100 | SYNOPSIS |
| 1101 | |
| 1102 | static int disable_break () |
| 1103 | |
| 1104 | DESCRIPTION |
| 1105 | |
| 1106 | Removes the breakpoint that gets hit when the dynamic linker |
| 1107 | completes a mapping change. |
| 1108 | |
| 1109 | */ |
| 1110 | |
| 1111 | static int |
| 1112 | disable_break () |
| 1113 | { |
| 1114 | int status = 1; |
| 1115 | |
| 1116 | |
| 1117 | /* Note that breakpoint address and original contents are in our address |
| 1118 | space, so we just need to write the original contents back. */ |
| 1119 | |
| 1120 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) |
| 1121 | { |
| 1122 | status = 0; |
| 1123 | } |
| 1124 | |
| 1125 | /* For the SVR4 version, we always know the breakpoint address. For the |
| 1126 | SunOS version we don't know it until the above code is executed. |
| 1127 | Grumble if we are stopped anywhere besides the breakpoint address. */ |
| 1128 | |
| 1129 | if (stop_pc != breakpoint_addr) |
| 1130 | { |
| 1131 | warning ("stopped at unknown breakpoint while handling shared libraries"); |
| 1132 | } |
| 1133 | |
| 1134 | return (status); |
| 1135 | } |
| 1136 | |
| 1137 | /* |
| 1138 | |
| 1139 | LOCAL FUNCTION |
| 1140 | |
| 1141 | enable_break -- arrange for dynamic linker to hit breakpoint |
| 1142 | |
| 1143 | SYNOPSIS |
| 1144 | |
| 1145 | int enable_break (void) |
| 1146 | |
| 1147 | DESCRIPTION |
| 1148 | |
| 1149 | This functions inserts a breakpoint at the entry point of the |
| 1150 | main executable, where all shared libraries are mapped in. |
| 1151 | */ |
| 1152 | |
| 1153 | static int |
| 1154 | enable_break () |
| 1155 | { |
| 1156 | if (symfile_objfile != NULL |
| 1157 | && target_insert_breakpoint (symfile_objfile->ei.entry_point, |
| 1158 | shadow_contents) == 0) |
| 1159 | { |
| 1160 | breakpoint_addr = symfile_objfile->ei.entry_point; |
| 1161 | return 1; |
| 1162 | } |
| 1163 | |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | /* |
| 1168 | |
| 1169 | GLOBAL FUNCTION |
| 1170 | |
| 1171 | solib_create_inferior_hook -- shared library startup support |
| 1172 | |
| 1173 | SYNOPSIS |
| 1174 | |
| 1175 | void solib_create_inferior_hook() |
| 1176 | |
| 1177 | DESCRIPTION |
| 1178 | |
| 1179 | When gdb starts up the inferior, it nurses it along (through the |
| 1180 | shell) until it is ready to execute it's first instruction. At this |
| 1181 | point, this function gets called via expansion of the macro |
| 1182 | SOLIB_CREATE_INFERIOR_HOOK. |
| 1183 | |
| 1184 | For SunOS executables, this first instruction is typically the |
| 1185 | one at "_start", or a similar text label, regardless of whether |
| 1186 | the executable is statically or dynamically linked. The runtime |
| 1187 | startup code takes care of dynamically linking in any shared |
| 1188 | libraries, once gdb allows the inferior to continue. |
| 1189 | |
| 1190 | For SVR4 executables, this first instruction is either the first |
| 1191 | instruction in the dynamic linker (for dynamically linked |
| 1192 | executables) or the instruction at "start" for statically linked |
| 1193 | executables. For dynamically linked executables, the system |
| 1194 | first exec's /lib/libc.so.N, which contains the dynamic linker, |
| 1195 | and starts it running. The dynamic linker maps in any needed |
| 1196 | shared libraries, maps in the actual user executable, and then |
| 1197 | jumps to "start" in the user executable. |
| 1198 | |
| 1199 | For both SunOS shared libraries, and SVR4 shared libraries, we |
| 1200 | can arrange to cooperate with the dynamic linker to discover the |
| 1201 | names of shared libraries that are dynamically linked, and the |
| 1202 | base addresses to which they are linked. |
| 1203 | |
| 1204 | This function is responsible for discovering those names and |
| 1205 | addresses, and saving sufficient information about them to allow |
| 1206 | their symbols to be read at a later time. |
| 1207 | |
| 1208 | FIXME |
| 1209 | |
| 1210 | Between enable_break() and disable_break(), this code does not |
| 1211 | properly handle hitting breakpoints which the user might have |
| 1212 | set in the startup code or in the dynamic linker itself. Proper |
| 1213 | handling will probably have to wait until the implementation is |
| 1214 | changed to use the "breakpoint handler function" method. |
| 1215 | |
| 1216 | Also, what if child has exit()ed? Must exit loop somehow. |
| 1217 | */ |
| 1218 | |
| 1219 | void |
| 1220 | solib_create_inferior_hook() |
| 1221 | { |
| 1222 | if (!enable_break ()) |
| 1223 | { |
| 1224 | warning ("shared library handler failed to enable breakpoint"); |
| 1225 | return; |
| 1226 | } |
| 1227 | |
| 1228 | /* Now run the target. It will eventually hit the breakpoint, at |
| 1229 | which point all of the libraries will have been mapped in and we |
| 1230 | can go groveling around in the dynamic linker structures to find |
| 1231 | out what we need to know about them. */ |
| 1232 | |
| 1233 | clear_proceed_status (); |
| 1234 | stop_soon_quietly = 1; |
| 1235 | stop_signal = TARGET_SIGNAL_0; |
| 1236 | do |
| 1237 | { |
| 1238 | target_resume (-1, 0, stop_signal); |
| 1239 | wait_for_inferior (); |
| 1240 | } |
| 1241 | while (stop_signal != TARGET_SIGNAL_TRAP); |
| 1242 | |
| 1243 | /* We are now either at the "mapping complete" breakpoint (or somewhere |
| 1244 | else, a condition we aren't prepared to deal with anyway), so adjust |
| 1245 | the PC as necessary after a breakpoint, disable the breakpoint, and |
| 1246 | add any shared libraries that were mapped in. */ |
| 1247 | |
| 1248 | if (DECR_PC_AFTER_BREAK) |
| 1249 | { |
| 1250 | stop_pc -= DECR_PC_AFTER_BREAK; |
| 1251 | write_register (PC_REGNUM, stop_pc); |
| 1252 | } |
| 1253 | |
| 1254 | if (!disable_break ()) |
| 1255 | { |
| 1256 | warning ("shared library handler failed to disable breakpoint"); |
| 1257 | } |
| 1258 | |
| 1259 | /* solib_add will call reinit_frame_cache. |
| 1260 | But we are stopped in the startup code and we might not have symbols |
| 1261 | for the startup code, so heuristic_proc_start could be called |
| 1262 | and will put out an annoying warning. |
| 1263 | Delaying the resetting of stop_soon_quietly until after symbol loading |
| 1264 | suppresses the warning. */ |
| 1265 | if (auto_solib_add) |
| 1266 | solib_add ((char *) 0, 0, (struct target_ops *) 0); |
| 1267 | stop_soon_quietly = 0; |
| 1268 | } |
| 1269 | |
| 1270 | /* |
| 1271 | |
| 1272 | LOCAL FUNCTION |
| 1273 | |
| 1274 | sharedlibrary_command -- handle command to explicitly add library |
| 1275 | |
| 1276 | SYNOPSIS |
| 1277 | |
| 1278 | static void sharedlibrary_command (char *args, int from_tty) |
| 1279 | |
| 1280 | DESCRIPTION |
| 1281 | |
| 1282 | */ |
| 1283 | |
| 1284 | static void |
| 1285 | sharedlibrary_command (args, from_tty) |
| 1286 | char *args; |
| 1287 | int from_tty; |
| 1288 | { |
| 1289 | dont_repeat (); |
| 1290 | solib_add (args, from_tty, (struct target_ops *) 0); |
| 1291 | } |
| 1292 | |
| 1293 | void |
| 1294 | _initialize_solib() |
| 1295 | { |
| 1296 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
| 1297 | "Load shared object library symbols for files matching REGEXP."); |
| 1298 | add_info ("sharedlibrary", info_sharedlibrary_command, |
| 1299 | "Status of loaded shared object libraries."); |
| 1300 | |
| 1301 | add_show_from_set |
| 1302 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, |
| 1303 | (char *) &auto_solib_add, |
| 1304 | "Set autoloading of shared library symbols.\n\ |
| 1305 | If nonzero, symbols from all shared object libraries will be loaded\n\ |
| 1306 | automatically when the inferior begins execution or when the dynamic linker\n\ |
| 1307 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ |
| 1308 | must be loaded manually, using `sharedlibrary'.", |
| 1309 | &setlist), |
| 1310 | &showlist); |
| 1311 | } |
| 1312 | |
| 1313 | \f |
| 1314 | /* Register that we are able to handle irix5 core file formats. |
| 1315 | This really is bfd_target_unknown_flavour */ |
| 1316 | |
| 1317 | static struct core_fns irix5_core_fns = |
| 1318 | { |
| 1319 | bfd_target_unknown_flavour, |
| 1320 | fetch_core_registers, |
| 1321 | NULL |
| 1322 | }; |
| 1323 | |
| 1324 | void |
| 1325 | _initialize_core_irix5 () |
| 1326 | { |
| 1327 | add_core_fns (&irix5_core_fns); |
| 1328 | } |