| 1 | /* Native support for the SGI Iris running IRIX version 5, for GDB. |
| 2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
| 3 | Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU |
| 4 | and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. |
| 5 | Implemented for Irix 4.x by Garrett A. Wollman. |
| 6 | Modified for Irix 5.x by Ian Lance Taylor. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "inferior.h" |
| 26 | #include "gdbcore.h" |
| 27 | #include "target.h" |
| 28 | |
| 29 | #include <sys/time.h> |
| 30 | #include <sys/procfs.h> |
| 31 | #include <setjmp.h> /* For JB_XXX. */ |
| 32 | |
| 33 | /* Size of elements in jmpbuf */ |
| 34 | |
| 35 | #define JB_ELEMENT_SIZE 4 |
| 36 | |
| 37 | /* |
| 38 | * See the comment in m68k-tdep.c regarding the utility of these functions. |
| 39 | * |
| 40 | * These definitions are from the MIPS SVR4 ABI, so they may work for |
| 41 | * any MIPS SVR4 target. |
| 42 | */ |
| 43 | |
| 44 | void |
| 45 | supply_gregset (gregsetp) |
| 46 | gregset_t *gregsetp; |
| 47 | { |
| 48 | register int regi; |
| 49 | register greg_t *regp = &(*gregsetp)[0]; |
| 50 | |
| 51 | for(regi = 0; regi <= CTX_RA; regi++) |
| 52 | supply_register (regi, (char *)(regp + regi)); |
| 53 | |
| 54 | supply_register (PC_REGNUM, (char *)(regp + CTX_EPC)); |
| 55 | supply_register (HI_REGNUM, (char *)(regp + CTX_MDHI)); |
| 56 | supply_register (LO_REGNUM, (char *)(regp + CTX_MDLO)); |
| 57 | supply_register (CAUSE_REGNUM, (char *)(regp + CTX_CAUSE)); |
| 58 | } |
| 59 | |
| 60 | void |
| 61 | fill_gregset (gregsetp, regno) |
| 62 | gregset_t *gregsetp; |
| 63 | int regno; |
| 64 | { |
| 65 | int regi; |
| 66 | register greg_t *regp = &(*gregsetp)[0]; |
| 67 | |
| 68 | for (regi = 0; regi <= CTX_RA; regi++) |
| 69 | if ((regno == -1) || (regno == regi)) |
| 70 | *(regp + regi) = *(greg_t *) ®isters[REGISTER_BYTE (regi)]; |
| 71 | |
| 72 | if ((regno == -1) || (regno == PC_REGNUM)) |
| 73 | *(regp + CTX_EPC) = *(greg_t *) ®isters[REGISTER_BYTE (PC_REGNUM)]; |
| 74 | |
| 75 | if ((regno == -1) || (regno == CAUSE_REGNUM)) |
| 76 | *(regp + CTX_CAUSE) = *(greg_t *) ®isters[REGISTER_BYTE (PS_REGNUM)]; |
| 77 | |
| 78 | if ((regno == -1) || (regno == HI_REGNUM)) |
| 79 | *(regp + CTX_MDHI) = *(greg_t *) ®isters[REGISTER_BYTE (HI_REGNUM)]; |
| 80 | |
| 81 | if ((regno == -1) || (regno == LO_REGNUM)) |
| 82 | *(regp + CTX_MDLO) = *(greg_t *) ®isters[REGISTER_BYTE (LO_REGNUM)]; |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Now we do the same thing for floating-point registers. |
| 87 | * We don't bother to condition on FP0_REGNUM since any |
| 88 | * reasonable MIPS configuration has an R3010 in it. |
| 89 | * |
| 90 | * Again, see the comments in m68k-tdep.c. |
| 91 | */ |
| 92 | |
| 93 | void |
| 94 | supply_fpregset (fpregsetp) |
| 95 | fpregset_t *fpregsetp; |
| 96 | { |
| 97 | register int regi; |
| 98 | |
| 99 | for (regi = 0; regi < 32; regi++) |
| 100 | supply_register (FP0_REGNUM + regi, |
| 101 | (char *)&fpregsetp->fp_r.fp_regs[regi]); |
| 102 | |
| 103 | supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr); |
| 104 | |
| 105 | /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */ |
| 106 | } |
| 107 | |
| 108 | void |
| 109 | fill_fpregset (fpregsetp, regno) |
| 110 | fpregset_t *fpregsetp; |
| 111 | int regno; |
| 112 | { |
| 113 | int regi; |
| 114 | char *from, *to; |
| 115 | |
| 116 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) |
| 117 | { |
| 118 | if ((regno == -1) || (regno == regi)) |
| 119 | { |
| 120 | from = (char *) ®isters[REGISTER_BYTE (regi)]; |
| 121 | to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); |
| 122 | memcpy(to, from, REGISTER_RAW_SIZE (regi)); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | if ((regno == -1) || (regno == FCRCS_REGNUM)) |
| 127 | fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)]; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /* Figure out where the longjmp will land. |
| 132 | We expect the first arg to be a pointer to the jmp_buf structure from which |
| 133 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| 134 | This routine returns true on success. */ |
| 135 | |
| 136 | int |
| 137 | get_longjmp_target (pc) |
| 138 | CORE_ADDR *pc; |
| 139 | { |
| 140 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; |
| 141 | CORE_ADDR jb_addr; |
| 142 | |
| 143 | jb_addr = read_register (A0_REGNUM); |
| 144 | |
| 145 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, |
| 146 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 147 | return 0; |
| 148 | |
| 149 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 150 | |
| 151 | return 1; |
| 152 | } |
| 153 | |
| 154 | void |
| 155 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 156 | char *core_reg_sect; |
| 157 | unsigned core_reg_size; |
| 158 | int which; /* Unused */ |
| 159 | unsigned int reg_addr; /* Unused */ |
| 160 | { |
| 161 | if (core_reg_size != REGISTER_BYTES) |
| 162 | { |
| 163 | warning ("wrong size gregset struct in core file"); |
| 164 | return; |
| 165 | } |
| 166 | |
| 167 | memcpy ((char *)registers, core_reg_sect, core_reg_size); |
| 168 | } |
| 169 | \f |
| 170 | /* Irix 5 uses what appears to be a unique form of shared library |
| 171 | support. This is a copy of solib.c modified for Irix 5. */ |
| 172 | |
| 173 | #include <sys/types.h> |
| 174 | #include <signal.h> |
| 175 | #include <string.h> |
| 176 | #include <sys/param.h> |
| 177 | #include <fcntl.h> |
| 178 | |
| 179 | /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts |
| 180 | with our versions of those files included by tm-mips.h. Prevent |
| 181 | <obj.h> from including them with some appropriate defines. */ |
| 182 | #define __SYM_H__ |
| 183 | #define __SYMCONST_H__ |
| 184 | #include <obj.h> |
| 185 | |
| 186 | #include "symtab.h" |
| 187 | #include "bfd.h" |
| 188 | #include "symfile.h" |
| 189 | #include "objfiles.h" |
| 190 | #include "command.h" |
| 191 | #include "frame.h" |
| 192 | #include "regex.h" |
| 193 | #include "inferior.h" |
| 194 | #include "language.h" |
| 195 | |
| 196 | /* We need to set a breakpoint at a point when we know that the |
| 197 | mapping of shared libraries is complete. dbx simply breaks at main |
| 198 | (or, for FORTRAN, MAIN__), so we do the same. We can not break at |
| 199 | the very beginning of main, because the startup code will jump into |
| 200 | main after the GP initialization instructions. SOLIB_BKPT_OFFSET |
| 201 | is used to skip those instructions. */ |
| 202 | |
| 203 | #define SOLIB_BKPT_OFFSET 12 |
| 204 | |
| 205 | static char *bkpt_names[] = { |
| 206 | "main", |
| 207 | "MAIN__", |
| 208 | NULL |
| 209 | }; |
| 210 | |
| 211 | /* The symbol which starts off the list of shared libraries. */ |
| 212 | #define DEBUG_BASE "__rld_obj_head" |
| 213 | |
| 214 | /* How to get the loaded address of a shared library. */ |
| 215 | #define LM_ADDR(so) ((so)->lm.o_base_address) |
| 216 | |
| 217 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
| 218 | |
| 219 | extern CORE_ADDR sigtramp_address, sigtramp_end; |
| 220 | |
| 221 | struct so_list { |
| 222 | struct so_list *next; /* next structure in linked list */ |
| 223 | struct obj_list ll; |
| 224 | struct obj lm; /* copy of link map from inferior */ |
| 225 | struct obj_list *lladdr; /* addr in inferior lm was read from */ |
| 226 | CORE_ADDR lmend; /* upper addr bound of mapped object */ |
| 227 | char symbols_loaded; /* flag: symbols read in yet? */ |
| 228 | char from_tty; /* flag: print msgs? */ |
| 229 | struct objfile *objfile; /* objfile for loaded lib */ |
| 230 | struct section_table *sections; |
| 231 | struct section_table *sections_end; |
| 232 | struct section_table *textsection; |
| 233 | bfd *abfd; |
| 234 | }; |
| 235 | |
| 236 | static struct so_list *so_list_head; /* List of known shared objects */ |
| 237 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
| 238 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ |
| 239 | |
| 240 | /* Local function prototypes */ |
| 241 | |
| 242 | static void |
| 243 | sharedlibrary_command PARAMS ((char *, int)); |
| 244 | |
| 245 | static int |
| 246 | enable_break PARAMS ((void)); |
| 247 | |
| 248 | static int |
| 249 | disable_break PARAMS ((void)); |
| 250 | |
| 251 | static void |
| 252 | info_sharedlibrary_command PARAMS ((char *, int)); |
| 253 | |
| 254 | static int |
| 255 | symbol_add_stub PARAMS ((char *)); |
| 256 | |
| 257 | static struct so_list * |
| 258 | find_solib PARAMS ((struct so_list *)); |
| 259 | |
| 260 | static struct obj_list * |
| 261 | first_link_map_member PARAMS ((void)); |
| 262 | |
| 263 | static CORE_ADDR |
| 264 | locate_base PARAMS ((void)); |
| 265 | |
| 266 | static void |
| 267 | solib_map_sections PARAMS ((struct so_list *)); |
| 268 | |
| 269 | /* |
| 270 | |
| 271 | LOCAL FUNCTION |
| 272 | |
| 273 | solib_map_sections -- open bfd and build sections for shared lib |
| 274 | |
| 275 | SYNOPSIS |
| 276 | |
| 277 | static void solib_map_sections (struct so_list *so) |
| 278 | |
| 279 | DESCRIPTION |
| 280 | |
| 281 | Given a pointer to one of the shared objects in our list |
| 282 | of mapped objects, use the recorded name to open a bfd |
| 283 | descriptor for the object, build a section table, and then |
| 284 | relocate all the section addresses by the base address at |
| 285 | which the shared object was mapped. |
| 286 | |
| 287 | FIXMES |
| 288 | |
| 289 | In most (all?) cases the shared object file name recorded in the |
| 290 | dynamic linkage tables will be a fully qualified pathname. For |
| 291 | cases where it isn't, do we really mimic the systems search |
| 292 | mechanism correctly in the below code (particularly the tilde |
| 293 | expansion stuff?). |
| 294 | */ |
| 295 | |
| 296 | static void |
| 297 | solib_map_sections (so) |
| 298 | struct so_list *so; |
| 299 | { |
| 300 | char *filename; |
| 301 | char *scratch_pathname; |
| 302 | int scratch_chan; |
| 303 | struct section_table *p; |
| 304 | struct cleanup *old_chain; |
| 305 | bfd *abfd; |
| 306 | |
| 307 | filename = tilde_expand (so -> lm.o_path); |
| 308 | old_chain = make_cleanup (free, filename); |
| 309 | |
| 310 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
| 311 | &scratch_pathname); |
| 312 | if (scratch_chan < 0) |
| 313 | { |
| 314 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, |
| 315 | O_RDONLY, 0, &scratch_pathname); |
| 316 | } |
| 317 | if (scratch_chan < 0) |
| 318 | { |
| 319 | perror_with_name (filename); |
| 320 | } |
| 321 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ |
| 322 | |
| 323 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
| 324 | if (!abfd) |
| 325 | { |
| 326 | close (scratch_chan); |
| 327 | error ("Could not open `%s' as an executable file: %s", |
| 328 | scratch_pathname, bfd_errmsg (bfd_error)); |
| 329 | } |
| 330 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
| 331 | so -> abfd = abfd; |
| 332 | abfd -> cacheable = true; |
| 333 | |
| 334 | if (!bfd_check_format (abfd, bfd_object)) |
| 335 | { |
| 336 | error ("\"%s\": not in executable format: %s.", |
| 337 | scratch_pathname, bfd_errmsg (bfd_error)); |
| 338 | } |
| 339 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) |
| 340 | { |
| 341 | error ("Can't find the file sections in `%s': %s", |
| 342 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_error)); |
| 343 | } |
| 344 | |
| 345 | for (p = so -> sections; p < so -> sections_end; p++) |
| 346 | { |
| 347 | /* Relocate the section binding addresses as recorded in the shared |
| 348 | object's file by the base address to which the object was actually |
| 349 | mapped. */ |
| 350 | p -> addr += (CORE_ADDR) LM_ADDR (so); |
| 351 | p -> endaddr += (CORE_ADDR) LM_ADDR (so); |
| 352 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); |
| 353 | if (STREQ (p -> sec_ptr -> name, ".text")) |
| 354 | { |
| 355 | so -> textsection = p; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /* Free the file names, close the file now. */ |
| 360 | do_cleanups (old_chain); |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | |
| 365 | LOCAL FUNCTION |
| 366 | |
| 367 | locate_base -- locate the base address of dynamic linker structs |
| 368 | |
| 369 | SYNOPSIS |
| 370 | |
| 371 | CORE_ADDR locate_base (void) |
| 372 | |
| 373 | DESCRIPTION |
| 374 | |
| 375 | For both the SunOS and SVR4 shared library implementations, if the |
| 376 | inferior executable has been linked dynamically, there is a single |
| 377 | address somewhere in the inferior's data space which is the key to |
| 378 | locating all of the dynamic linker's runtime structures. This |
| 379 | address is the value of the symbol defined by the macro DEBUG_BASE. |
| 380 | The job of this function is to find and return that address, or to |
| 381 | return 0 if there is no such address (the executable is statically |
| 382 | linked for example). |
| 383 | |
| 384 | For SunOS, the job is almost trivial, since the dynamic linker and |
| 385 | all of it's structures are statically linked to the executable at |
| 386 | link time. Thus the symbol for the address we are looking for has |
| 387 | already been added to the minimal symbol table for the executable's |
| 388 | objfile at the time the symbol file's symbols were read, and all we |
| 389 | have to do is look it up there. Note that we explicitly do NOT want |
| 390 | to find the copies in the shared library. |
| 391 | |
| 392 | The SVR4 version is much more complicated because the dynamic linker |
| 393 | and it's structures are located in the shared C library, which gets |
| 394 | run as the executable's "interpreter" by the kernel. We have to go |
| 395 | to a lot more work to discover the address of DEBUG_BASE. Because |
| 396 | of this complexity, we cache the value we find and return that value |
| 397 | on subsequent invocations. Note there is no copy in the executable |
| 398 | symbol tables. |
| 399 | |
| 400 | Irix 5 is basically like SunOS. |
| 401 | |
| 402 | Note that we can assume nothing about the process state at the time |
| 403 | we need to find this address. We may be stopped on the first instruc- |
| 404 | tion of the interpreter (C shared library), the first instruction of |
| 405 | the executable itself, or somewhere else entirely (if we attached |
| 406 | to the process for example). |
| 407 | |
| 408 | */ |
| 409 | |
| 410 | static CORE_ADDR |
| 411 | locate_base () |
| 412 | { |
| 413 | struct minimal_symbol *msymbol; |
| 414 | CORE_ADDR address = 0; |
| 415 | |
| 416 | msymbol = lookup_minimal_symbol (DEBUG_BASE, symfile_objfile); |
| 417 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
| 418 | { |
| 419 | address = SYMBOL_VALUE_ADDRESS (msymbol); |
| 420 | } |
| 421 | return (address); |
| 422 | } |
| 423 | |
| 424 | /* |
| 425 | |
| 426 | LOCAL FUNCTION |
| 427 | |
| 428 | first_link_map_member -- locate first member in dynamic linker's map |
| 429 | |
| 430 | SYNOPSIS |
| 431 | |
| 432 | static struct link_map *first_link_map_member (void) |
| 433 | |
| 434 | DESCRIPTION |
| 435 | |
| 436 | Read in a copy of the first member in the inferior's dynamic |
| 437 | link map from the inferior's dynamic linker structures, and return |
| 438 | a pointer to the copy in our address space. |
| 439 | */ |
| 440 | |
| 441 | static struct obj_list * |
| 442 | first_link_map_member () |
| 443 | { |
| 444 | struct obj_list *lm; |
| 445 | struct obj_list s; |
| 446 | |
| 447 | read_memory (debug_base, (char *) &lm, sizeof (struct obj_list *)); |
| 448 | |
| 449 | if (lm == NULL) |
| 450 | return NULL; |
| 451 | |
| 452 | /* The first entry in the list is the object file we are debugging, |
| 453 | so skip it. */ |
| 454 | read_memory ((CORE_ADDR) lm, (char *) &s, sizeof (struct obj_list)); |
| 455 | |
| 456 | return s.next; |
| 457 | } |
| 458 | |
| 459 | /* |
| 460 | |
| 461 | LOCAL FUNCTION |
| 462 | |
| 463 | find_solib -- step through list of shared objects |
| 464 | |
| 465 | SYNOPSIS |
| 466 | |
| 467 | struct so_list *find_solib (struct so_list *so_list_ptr) |
| 468 | |
| 469 | DESCRIPTION |
| 470 | |
| 471 | This module contains the routine which finds the names of any |
| 472 | loaded "images" in the current process. The argument in must be |
| 473 | NULL on the first call, and then the returned value must be passed |
| 474 | in on subsequent calls. This provides the capability to "step" down |
| 475 | the list of loaded objects. On the last object, a NULL value is |
| 476 | returned. |
| 477 | */ |
| 478 | |
| 479 | static struct so_list * |
| 480 | find_solib (so_list_ptr) |
| 481 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ |
| 482 | { |
| 483 | struct so_list *so_list_next = NULL; |
| 484 | struct obj_list *lm = NULL; |
| 485 | struct so_list *new; |
| 486 | |
| 487 | if (so_list_ptr == NULL) |
| 488 | { |
| 489 | /* We are setting up for a new scan through the loaded images. */ |
| 490 | if ((so_list_next = so_list_head) == NULL) |
| 491 | { |
| 492 | /* We have not already read in the dynamic linking structures |
| 493 | from the inferior, lookup the address of the base structure. */ |
| 494 | debug_base = locate_base (); |
| 495 | if (debug_base != 0) |
| 496 | { |
| 497 | /* Read the base structure in and find the address of the first |
| 498 | link map list member. */ |
| 499 | lm = first_link_map_member (); |
| 500 | } |
| 501 | } |
| 502 | } |
| 503 | else |
| 504 | { |
| 505 | /* We have been called before, and are in the process of walking |
| 506 | the shared library list. Advance to the next shared object. */ |
| 507 | if ((lm = so_list_ptr->ll.next) == NULL) |
| 508 | { |
| 509 | /* We have hit the end of the list, so check to see if any were |
| 510 | added, but be quiet if we can't read from the target any more. */ |
| 511 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lladdr, |
| 512 | (char *) &(so_list_ptr -> ll), |
| 513 | sizeof (struct obj_list)); |
| 514 | if (status == 0) |
| 515 | { |
| 516 | lm = so_list_ptr->ll.next; |
| 517 | } |
| 518 | else |
| 519 | { |
| 520 | lm = NULL; |
| 521 | } |
| 522 | } |
| 523 | so_list_next = so_list_ptr -> next; |
| 524 | } |
| 525 | if ((so_list_next == NULL) && (lm != NULL)) |
| 526 | { |
| 527 | /* Get next link map structure from inferior image and build a local |
| 528 | abbreviated load_map structure */ |
| 529 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 530 | memset ((char *) new, 0, sizeof (struct so_list)); |
| 531 | new -> lladdr = lm; |
| 532 | /* Add the new node as the next node in the list, or as the root |
| 533 | node if this is the first one. */ |
| 534 | if (so_list_ptr != NULL) |
| 535 | { |
| 536 | so_list_ptr -> next = new; |
| 537 | } |
| 538 | else |
| 539 | { |
| 540 | so_list_head = new; |
| 541 | } |
| 542 | so_list_next = new; |
| 543 | read_memory ((CORE_ADDR) lm, (char *) &(new -> ll), |
| 544 | sizeof (struct obj_list)); |
| 545 | read_memory ((CORE_ADDR) new->ll.data, (char *) &(new -> lm), |
| 546 | sizeof (struct obj)); |
| 547 | solib_map_sections (new); |
| 548 | } |
| 549 | return (so_list_next); |
| 550 | } |
| 551 | |
| 552 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
| 553 | |
| 554 | static int |
| 555 | symbol_add_stub (arg) |
| 556 | char *arg; |
| 557 | { |
| 558 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
| 559 | |
| 560 | so -> objfile = symbol_file_add (so -> lm.o_path, so -> from_tty, |
| 561 | (unsigned int) so -> textsection -> addr, |
| 562 | 0, 0, 0); |
| 563 | return (1); |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | |
| 568 | GLOBAL FUNCTION |
| 569 | |
| 570 | solib_add -- add a shared library file to the symtab and section list |
| 571 | |
| 572 | SYNOPSIS |
| 573 | |
| 574 | void solib_add (char *arg_string, int from_tty, |
| 575 | struct target_ops *target) |
| 576 | |
| 577 | DESCRIPTION |
| 578 | |
| 579 | */ |
| 580 | |
| 581 | void |
| 582 | solib_add (arg_string, from_tty, target) |
| 583 | char *arg_string; |
| 584 | int from_tty; |
| 585 | struct target_ops *target; |
| 586 | { |
| 587 | register struct so_list *so = NULL; /* link map state variable */ |
| 588 | |
| 589 | /* Last shared library that we read. */ |
| 590 | struct so_list *so_last = NULL; |
| 591 | |
| 592 | char *re_err; |
| 593 | int count; |
| 594 | int old; |
| 595 | |
| 596 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
| 597 | { |
| 598 | error ("Invalid regexp: %s", re_err); |
| 599 | } |
| 600 | |
| 601 | /* Getting new symbols may change our opinion about what is |
| 602 | frameless. */ |
| 603 | reinit_frame_cache (); |
| 604 | /* Not to mention where _sigtramp is. */ |
| 605 | sigtramp_address = 0; |
| 606 | |
| 607 | while ((so = find_solib (so)) != NULL) |
| 608 | { |
| 609 | if (so -> lm.o_path[0] && re_exec (so -> lm.o_path)) |
| 610 | { |
| 611 | so -> from_tty = from_tty; |
| 612 | if (so -> symbols_loaded) |
| 613 | { |
| 614 | if (from_tty) |
| 615 | { |
| 616 | printf_unfiltered ("Symbols already loaded for %s\n", so -> lm.o_path); |
| 617 | } |
| 618 | } |
| 619 | else if (catch_errors |
| 620 | (symbol_add_stub, (char *) so, |
| 621 | "Error while reading shared library symbols:\n", |
| 622 | RETURN_MASK_ALL)) |
| 623 | { |
| 624 | so_last = so; |
| 625 | so -> symbols_loaded = 1; |
| 626 | } |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | /* Now add the shared library sections to the section table of the |
| 631 | specified target, if any. */ |
| 632 | if (target) |
| 633 | { |
| 634 | /* Count how many new section_table entries there are. */ |
| 635 | so = NULL; |
| 636 | count = 0; |
| 637 | while ((so = find_solib (so)) != NULL) |
| 638 | { |
| 639 | if (so -> lm.o_path[0]) |
| 640 | { |
| 641 | count += so -> sections_end - so -> sections; |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | if (count) |
| 646 | { |
| 647 | /* Reallocate the target's section table including the new size. */ |
| 648 | if (target -> to_sections) |
| 649 | { |
| 650 | old = target -> to_sections_end - target -> to_sections; |
| 651 | target -> to_sections = (struct section_table *) |
| 652 | xrealloc ((char *)target -> to_sections, |
| 653 | (sizeof (struct section_table)) * (count + old)); |
| 654 | } |
| 655 | else |
| 656 | { |
| 657 | old = 0; |
| 658 | target -> to_sections = (struct section_table *) |
| 659 | xmalloc ((sizeof (struct section_table)) * count); |
| 660 | } |
| 661 | target -> to_sections_end = target -> to_sections + (count + old); |
| 662 | |
| 663 | /* Add these section table entries to the target's table. */ |
| 664 | while ((so = find_solib (so)) != NULL) |
| 665 | { |
| 666 | if (so -> lm.o_path[0]) |
| 667 | { |
| 668 | count = so -> sections_end - so -> sections; |
| 669 | memcpy ((char *) (target -> to_sections + old), |
| 670 | so -> sections, |
| 671 | (sizeof (struct section_table)) * count); |
| 672 | old += count; |
| 673 | } |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | } |
| 678 | |
| 679 | /* |
| 680 | |
| 681 | LOCAL FUNCTION |
| 682 | |
| 683 | info_sharedlibrary_command -- code for "info sharedlibrary" |
| 684 | |
| 685 | SYNOPSIS |
| 686 | |
| 687 | static void info_sharedlibrary_command () |
| 688 | |
| 689 | DESCRIPTION |
| 690 | |
| 691 | Walk through the shared library list and print information |
| 692 | about each attached library. |
| 693 | */ |
| 694 | |
| 695 | static void |
| 696 | info_sharedlibrary_command (ignore, from_tty) |
| 697 | char *ignore; |
| 698 | int from_tty; |
| 699 | { |
| 700 | register struct so_list *so = NULL; /* link map state variable */ |
| 701 | int header_done = 0; |
| 702 | |
| 703 | if (exec_bfd == NULL) |
| 704 | { |
| 705 | printf_unfiltered ("No exec file.\n"); |
| 706 | return; |
| 707 | } |
| 708 | while ((so = find_solib (so)) != NULL) |
| 709 | { |
| 710 | if (so -> lm.o_path[0]) |
| 711 | { |
| 712 | if (!header_done) |
| 713 | { |
| 714 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", |
| 715 | "Shared Object Library"); |
| 716 | header_done++; |
| 717 | } |
| 718 | printf_unfiltered ("%-12s", |
| 719 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
| 720 | "08l")); |
| 721 | printf_unfiltered ("%-12s", |
| 722 | local_hex_string_custom ((unsigned long) so -> lmend, |
| 723 | "08l")); |
| 724 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); |
| 725 | printf_unfiltered ("%s\n", so -> lm.o_path); |
| 726 | } |
| 727 | } |
| 728 | if (so_list_head == NULL) |
| 729 | { |
| 730 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | |
| 736 | GLOBAL FUNCTION |
| 737 | |
| 738 | solib_address -- check to see if an address is in a shared lib |
| 739 | |
| 740 | SYNOPSIS |
| 741 | |
| 742 | int solib_address (CORE_ADDR address) |
| 743 | |
| 744 | DESCRIPTION |
| 745 | |
| 746 | Provides a hook for other gdb routines to discover whether or |
| 747 | not a particular address is within the mapped address space of |
| 748 | a shared library. Any address between the base mapping address |
| 749 | and the first address beyond the end of the last mapping, is |
| 750 | considered to be within the shared library address space, for |
| 751 | our purposes. |
| 752 | |
| 753 | For example, this routine is called at one point to disable |
| 754 | breakpoints which are in shared libraries that are not currently |
| 755 | mapped in. |
| 756 | */ |
| 757 | |
| 758 | int |
| 759 | solib_address (address) |
| 760 | CORE_ADDR address; |
| 761 | { |
| 762 | register struct so_list *so = 0; /* link map state variable */ |
| 763 | |
| 764 | while ((so = find_solib (so)) != NULL) |
| 765 | { |
| 766 | if (so -> lm.o_path[0]) |
| 767 | { |
| 768 | if ((address >= (CORE_ADDR) so->lm.o_base_address) && |
| 769 | (address < (CORE_ADDR) so -> lmend)) |
| 770 | { |
| 771 | return (1); |
| 772 | } |
| 773 | } |
| 774 | } |
| 775 | return (0); |
| 776 | } |
| 777 | |
| 778 | /* Called by free_all_symtabs */ |
| 779 | |
| 780 | void |
| 781 | clear_solib() |
| 782 | { |
| 783 | struct so_list *next; |
| 784 | char *bfd_filename; |
| 785 | |
| 786 | while (so_list_head) |
| 787 | { |
| 788 | if (so_list_head -> sections) |
| 789 | { |
| 790 | free ((PTR)so_list_head -> sections); |
| 791 | } |
| 792 | if (so_list_head -> abfd) |
| 793 | { |
| 794 | bfd_filename = bfd_get_filename (so_list_head -> abfd); |
| 795 | bfd_close (so_list_head -> abfd); |
| 796 | } |
| 797 | else |
| 798 | /* This happens for the executable on SVR4. */ |
| 799 | bfd_filename = NULL; |
| 800 | |
| 801 | next = so_list_head -> next; |
| 802 | if (bfd_filename) |
| 803 | free ((PTR)bfd_filename); |
| 804 | free ((PTR)so_list_head); |
| 805 | so_list_head = next; |
| 806 | } |
| 807 | debug_base = 0; |
| 808 | } |
| 809 | |
| 810 | /* |
| 811 | |
| 812 | LOCAL FUNCTION |
| 813 | |
| 814 | disable_break -- remove the "mapping changed" breakpoint |
| 815 | |
| 816 | SYNOPSIS |
| 817 | |
| 818 | static int disable_break () |
| 819 | |
| 820 | DESCRIPTION |
| 821 | |
| 822 | Removes the breakpoint that gets hit when the dynamic linker |
| 823 | completes a mapping change. |
| 824 | |
| 825 | */ |
| 826 | |
| 827 | static int |
| 828 | disable_break () |
| 829 | { |
| 830 | int status = 1; |
| 831 | |
| 832 | |
| 833 | /* Note that breakpoint address and original contents are in our address |
| 834 | space, so we just need to write the original contents back. */ |
| 835 | |
| 836 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) |
| 837 | { |
| 838 | status = 0; |
| 839 | } |
| 840 | |
| 841 | /* For the SVR4 version, we always know the breakpoint address. For the |
| 842 | SunOS version we don't know it until the above code is executed. |
| 843 | Grumble if we are stopped anywhere besides the breakpoint address. */ |
| 844 | |
| 845 | if (stop_pc != breakpoint_addr) |
| 846 | { |
| 847 | warning ("stopped at unknown breakpoint while handling shared libraries"); |
| 848 | } |
| 849 | |
| 850 | return (status); |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | |
| 855 | LOCAL FUNCTION |
| 856 | |
| 857 | enable_break -- arrange for dynamic linker to hit breakpoint |
| 858 | |
| 859 | SYNOPSIS |
| 860 | |
| 861 | int enable_break (void) |
| 862 | |
| 863 | DESCRIPTION |
| 864 | |
| 865 | Both the SunOS and the SVR4 dynamic linkers have, as part of their |
| 866 | debugger interface, support for arranging for the inferior to hit |
| 867 | a breakpoint after mapping in the shared libraries. This function |
| 868 | enables that breakpoint. |
| 869 | |
| 870 | For SunOS, there is a special flag location (in_debugger) which we |
| 871 | set to 1. When the dynamic linker sees this flag set, it will set |
| 872 | a breakpoint at a location known only to itself, after saving the |
| 873 | original contents of that place and the breakpoint address itself, |
| 874 | in it's own internal structures. When we resume the inferior, it |
| 875 | will eventually take a SIGTRAP when it runs into the breakpoint. |
| 876 | We handle this (in a different place) by restoring the contents of |
| 877 | the breakpointed location (which is only known after it stops), |
| 878 | chasing around to locate the shared libraries that have been |
| 879 | loaded, then resuming. |
| 880 | |
| 881 | For SVR4, the debugger interface structure contains a member (r_brk) |
| 882 | which is statically initialized at the time the shared library is |
| 883 | built, to the offset of a function (_r_debug_state) which is guaran- |
| 884 | teed to be called once before mapping in a library, and again when |
| 885 | the mapping is complete. At the time we are examining this member, |
| 886 | it contains only the unrelocated offset of the function, so we have |
| 887 | to do our own relocation. Later, when the dynamic linker actually |
| 888 | runs, it relocates r_brk to be the actual address of _r_debug_state(). |
| 889 | |
| 890 | The debugger interface structure also contains an enumeration which |
| 891 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, |
| 892 | depending upon whether or not the library is being mapped or unmapped, |
| 893 | and then set to RT_CONSISTENT after the library is mapped/unmapped. |
| 894 | |
| 895 | Irix 5, on the other hand, has no such features. Instead, we |
| 896 | set a breakpoint at main. |
| 897 | */ |
| 898 | |
| 899 | static int |
| 900 | enable_break () |
| 901 | { |
| 902 | int success = 0; |
| 903 | struct minimal_symbol *msymbol; |
| 904 | char **bkpt_namep; |
| 905 | CORE_ADDR bkpt_addr; |
| 906 | |
| 907 | /* Scan through the list of symbols, trying to look up the symbol and |
| 908 | set a breakpoint there. Terminate loop when we/if we succeed. */ |
| 909 | |
| 910 | breakpoint_addr = 0; |
| 911 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) |
| 912 | { |
| 913 | msymbol = lookup_minimal_symbol (*bkpt_namep, symfile_objfile); |
| 914 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
| 915 | { |
| 916 | bkpt_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 917 | #ifdef SOLIB_BKPT_OFFSET |
| 918 | /* We only want to skip if bkpt_addr is currently pointing |
| 919 | at a GP setting instruction. */ |
| 920 | { |
| 921 | char buf[4]; |
| 922 | |
| 923 | if (target_read_memory (bkpt_addr, buf, 4) == 0) |
| 924 | { |
| 925 | unsigned long insn; |
| 926 | |
| 927 | insn = extract_unsigned_integer (buf, 4); |
| 928 | if ((insn & 0xffff0000) == 0x3c1c0000) /* lui $gp,n */ |
| 929 | bkpt_addr += SOLIB_BKPT_OFFSET; |
| 930 | } |
| 931 | } |
| 932 | #endif |
| 933 | if (target_insert_breakpoint (bkpt_addr, shadow_contents) == 0) |
| 934 | { |
| 935 | breakpoint_addr = bkpt_addr; |
| 936 | success = 1; |
| 937 | break; |
| 938 | } |
| 939 | } |
| 940 | } |
| 941 | |
| 942 | return (success); |
| 943 | } |
| 944 | |
| 945 | /* |
| 946 | |
| 947 | GLOBAL FUNCTION |
| 948 | |
| 949 | solib_create_inferior_hook -- shared library startup support |
| 950 | |
| 951 | SYNOPSIS |
| 952 | |
| 953 | void solib_create_inferior_hook() |
| 954 | |
| 955 | DESCRIPTION |
| 956 | |
| 957 | When gdb starts up the inferior, it nurses it along (through the |
| 958 | shell) until it is ready to execute it's first instruction. At this |
| 959 | point, this function gets called via expansion of the macro |
| 960 | SOLIB_CREATE_INFERIOR_HOOK. |
| 961 | |
| 962 | For SunOS executables, this first instruction is typically the |
| 963 | one at "_start", or a similar text label, regardless of whether |
| 964 | the executable is statically or dynamically linked. The runtime |
| 965 | startup code takes care of dynamically linking in any shared |
| 966 | libraries, once gdb allows the inferior to continue. |
| 967 | |
| 968 | For SVR4 executables, this first instruction is either the first |
| 969 | instruction in the dynamic linker (for dynamically linked |
| 970 | executables) or the instruction at "start" for statically linked |
| 971 | executables. For dynamically linked executables, the system |
| 972 | first exec's /lib/libc.so.N, which contains the dynamic linker, |
| 973 | and starts it running. The dynamic linker maps in any needed |
| 974 | shared libraries, maps in the actual user executable, and then |
| 975 | jumps to "start" in the user executable. |
| 976 | |
| 977 | For both SunOS shared libraries, and SVR4 shared libraries, we |
| 978 | can arrange to cooperate with the dynamic linker to discover the |
| 979 | names of shared libraries that are dynamically linked, and the |
| 980 | base addresses to which they are linked. |
| 981 | |
| 982 | This function is responsible for discovering those names and |
| 983 | addresses, and saving sufficient information about them to allow |
| 984 | their symbols to be read at a later time. |
| 985 | |
| 986 | FIXME |
| 987 | |
| 988 | Between enable_break() and disable_break(), this code does not |
| 989 | properly handle hitting breakpoints which the user might have |
| 990 | set in the startup code or in the dynamic linker itself. Proper |
| 991 | handling will probably have to wait until the implementation is |
| 992 | changed to use the "breakpoint handler function" method. |
| 993 | |
| 994 | Also, what if child has exit()ed? Must exit loop somehow. |
| 995 | */ |
| 996 | |
| 997 | void |
| 998 | solib_create_inferior_hook() |
| 999 | { |
| 1000 | if (!enable_break ()) |
| 1001 | { |
| 1002 | warning ("shared library handler failed to enable breakpoint"); |
| 1003 | return; |
| 1004 | } |
| 1005 | |
| 1006 | /* Now run the target. It will eventually hit the breakpoint, at |
| 1007 | which point all of the libraries will have been mapped in and we |
| 1008 | can go groveling around in the dynamic linker structures to find |
| 1009 | out what we need to know about them. */ |
| 1010 | |
| 1011 | clear_proceed_status (); |
| 1012 | stop_soon_quietly = 1; |
| 1013 | stop_signal = 0; |
| 1014 | do |
| 1015 | { |
| 1016 | target_resume (-1, 0, stop_signal); |
| 1017 | wait_for_inferior (); |
| 1018 | } |
| 1019 | while (stop_signal != SIGTRAP); |
| 1020 | stop_soon_quietly = 0; |
| 1021 | |
| 1022 | /* We are now either at the "mapping complete" breakpoint (or somewhere |
| 1023 | else, a condition we aren't prepared to deal with anyway), so adjust |
| 1024 | the PC as necessary after a breakpoint, disable the breakpoint, and |
| 1025 | add any shared libraries that were mapped in. */ |
| 1026 | |
| 1027 | if (DECR_PC_AFTER_BREAK) |
| 1028 | { |
| 1029 | stop_pc -= DECR_PC_AFTER_BREAK; |
| 1030 | write_register (PC_REGNUM, stop_pc); |
| 1031 | } |
| 1032 | |
| 1033 | if (!disable_break ()) |
| 1034 | { |
| 1035 | warning ("shared library handler failed to disable breakpoint"); |
| 1036 | } |
| 1037 | |
| 1038 | solib_add ((char *) 0, 0, (struct target_ops *) 0); |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | |
| 1043 | LOCAL FUNCTION |
| 1044 | |
| 1045 | sharedlibrary_command -- handle command to explicitly add library |
| 1046 | |
| 1047 | SYNOPSIS |
| 1048 | |
| 1049 | static void sharedlibrary_command (char *args, int from_tty) |
| 1050 | |
| 1051 | DESCRIPTION |
| 1052 | |
| 1053 | */ |
| 1054 | |
| 1055 | static void |
| 1056 | sharedlibrary_command (args, from_tty) |
| 1057 | char *args; |
| 1058 | int from_tty; |
| 1059 | { |
| 1060 | dont_repeat (); |
| 1061 | solib_add (args, from_tty, (struct target_ops *) 0); |
| 1062 | } |
| 1063 | |
| 1064 | void |
| 1065 | _initialize_solib() |
| 1066 | { |
| 1067 | |
| 1068 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
| 1069 | "Load shared object library symbols for files matching REGEXP."); |
| 1070 | add_info ("sharedlibrary", info_sharedlibrary_command, |
| 1071 | "Status of loaded shared object libraries."); |
| 1072 | } |