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c906108c SS |
1 | /* Native support for the SGI Iris running IRIX version 5, for GDB. |
2 | Copyright 1988, 89, 90, 91, 92, 93, 94, 95, 96, 98, 1999 | |
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 | ||
c5aa993b | 9 | This file is part of GDB. |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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. | |
c906108c | 20 | |
c5aa993b JM |
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, | |
24 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
25 | |
26 | #include "defs.h" | |
27 | #include "inferior.h" | |
28 | #include "gdbcore.h" | |
29 | #include "target.h" | |
30 | ||
31 | #include "gdb_string.h" | |
32 | #include <sys/time.h> | |
33 | #include <sys/procfs.h> | |
34 | #include <setjmp.h> /* For JB_XXX. */ | |
35 | ||
c60c0f5f MS |
36 | /* Prototypes for supply_gregset etc. */ |
37 | #include "gregset.h" | |
38 | ||
a14ed312 | 39 | static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR); |
c906108c SS |
40 | |
41 | /* Size of elements in jmpbuf */ | |
42 | ||
43 | #define JB_ELEMENT_SIZE 4 | |
44 | ||
45 | /* | |
46 | * See the comment in m68k-tdep.c regarding the utility of these functions. | |
47 | * | |
48 | * These definitions are from the MIPS SVR4 ABI, so they may work for | |
49 | * any MIPS SVR4 target. | |
50 | */ | |
51 | ||
c5aa993b | 52 | void |
fba45db2 | 53 | supply_gregset (gregset_t *gregsetp) |
c906108c SS |
54 | { |
55 | register int regi; | |
56 | register greg_t *regp = &(*gregsetp)[0]; | |
57 | int gregoff = sizeof (greg_t) - MIPS_REGSIZE; | |
c5aa993b JM |
58 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
59 | {0}; | |
c906108c | 60 | |
c5aa993b JM |
61 | for (regi = 0; regi <= CTX_RA; regi++) |
62 | supply_register (regi, (char *) (regp + regi) + gregoff); | |
c906108c | 63 | |
c5aa993b JM |
64 | supply_register (PC_REGNUM, (char *) (regp + CTX_EPC) + gregoff); |
65 | supply_register (HI_REGNUM, (char *) (regp + CTX_MDHI) + gregoff); | |
66 | supply_register (LO_REGNUM, (char *) (regp + CTX_MDLO) + gregoff); | |
67 | supply_register (CAUSE_REGNUM, (char *) (regp + CTX_CAUSE) + gregoff); | |
c906108c SS |
68 | |
69 | /* Fill inaccessible registers with zero. */ | |
70 | supply_register (BADVADDR_REGNUM, zerobuf); | |
71 | } | |
72 | ||
73 | void | |
fba45db2 | 74 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c SS |
75 | { |
76 | int regi; | |
77 | register greg_t *regp = &(*gregsetp)[0]; | |
78 | ||
79 | /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32 | |
80 | executable, we have to sign extend the registers to 64 bits before | |
81 | filling in the gregset structure. */ | |
82 | ||
83 | for (regi = 0; regi <= CTX_RA; regi++) | |
84 | if ((regno == -1) || (regno == regi)) | |
85 | *(regp + regi) = | |
86 | extract_signed_integer (®isters[REGISTER_BYTE (regi)], | |
87 | REGISTER_RAW_SIZE (regi)); | |
88 | ||
89 | if ((regno == -1) || (regno == PC_REGNUM)) | |
90 | *(regp + CTX_EPC) = | |
91 | extract_signed_integer (®isters[REGISTER_BYTE (PC_REGNUM)], | |
92 | REGISTER_RAW_SIZE (PC_REGNUM)); | |
93 | ||
94 | if ((regno == -1) || (regno == CAUSE_REGNUM)) | |
95 | *(regp + CTX_CAUSE) = | |
96 | extract_signed_integer (®isters[REGISTER_BYTE (CAUSE_REGNUM)], | |
97 | REGISTER_RAW_SIZE (CAUSE_REGNUM)); | |
98 | ||
99 | if ((regno == -1) || (regno == HI_REGNUM)) | |
100 | *(regp + CTX_MDHI) = | |
101 | extract_signed_integer (®isters[REGISTER_BYTE (HI_REGNUM)], | |
102 | REGISTER_RAW_SIZE (HI_REGNUM)); | |
103 | ||
104 | if ((regno == -1) || (regno == LO_REGNUM)) | |
105 | *(regp + CTX_MDLO) = | |
106 | extract_signed_integer (®isters[REGISTER_BYTE (LO_REGNUM)], | |
107 | REGISTER_RAW_SIZE (LO_REGNUM)); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Now we do the same thing for floating-point registers. | |
112 | * We don't bother to condition on FP0_REGNUM since any | |
113 | * reasonable MIPS configuration has an R3010 in it. | |
114 | * | |
115 | * Again, see the comments in m68k-tdep.c. | |
116 | */ | |
117 | ||
118 | void | |
fba45db2 | 119 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c SS |
120 | { |
121 | register int regi; | |
c5aa993b JM |
122 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = |
123 | {0}; | |
c906108c SS |
124 | |
125 | /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ | |
126 | ||
127 | for (regi = 0; regi < 32; regi++) | |
128 | supply_register (FP0_REGNUM + regi, | |
c5aa993b | 129 | (char *) &fpregsetp->fp_r.fp_regs[regi]); |
c906108c | 130 | |
c5aa993b | 131 | supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr); |
c906108c SS |
132 | |
133 | /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */ | |
134 | supply_register (FCRIR_REGNUM, zerobuf); | |
135 | } | |
136 | ||
137 | void | |
fba45db2 | 138 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
139 | { |
140 | int regi; | |
141 | char *from, *to; | |
142 | ||
143 | /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ | |
144 | ||
145 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) | |
146 | { | |
147 | if ((regno == -1) || (regno == regi)) | |
148 | { | |
149 | from = (char *) ®isters[REGISTER_BYTE (regi)]; | |
150 | to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); | |
c5aa993b | 151 | memcpy (to, from, REGISTER_RAW_SIZE (regi)); |
c906108c SS |
152 | } |
153 | } | |
154 | ||
155 | if ((regno == -1) || (regno == FCRCS_REGNUM)) | |
c5aa993b | 156 | fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE (FCRCS_REGNUM)]; |
c906108c SS |
157 | } |
158 | ||
159 | ||
160 | /* Figure out where the longjmp will land. | |
161 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
162 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
163 | This routine returns true on success. */ | |
164 | ||
165 | int | |
fba45db2 | 166 | get_longjmp_target (CORE_ADDR *pc) |
c906108c | 167 | { |
35fc8285 | 168 | char *buf; |
c906108c SS |
169 | CORE_ADDR jb_addr; |
170 | ||
35fc8285 | 171 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
172 | jb_addr = read_register (A0_REGNUM); |
173 | ||
174 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
175 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
176 | return 0; | |
177 | ||
178 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
179 | ||
180 | return 1; | |
181 | } | |
182 | ||
183 | static void | |
184 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
185 | char *core_reg_sect; | |
186 | unsigned core_reg_size; | |
187 | int which; /* Unused */ | |
188 | CORE_ADDR reg_addr; /* Unused */ | |
189 | { | |
190 | if (core_reg_size == REGISTER_BYTES) | |
191 | { | |
c5aa993b | 192 | memcpy ((char *) registers, core_reg_sect, core_reg_size); |
c906108c SS |
193 | } |
194 | else if (MIPS_REGSIZE == 4 && | |
195 | core_reg_size == (2 * MIPS_REGSIZE) * NUM_REGS) | |
196 | { | |
197 | /* This is a core file from a N32 executable, 64 bits are saved | |
c5aa993b | 198 | for all registers. */ |
c906108c SS |
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 | |
c5aa993b | 208 | currently assumes that they are 32 bit. */ |
c906108c SS |
209 | *dstp++ = *srcp++; |
210 | *dstp++ = *srcp++; | |
211 | *dstp++ = *srcp++; | |
212 | *dstp++ = *srcp++; | |
c5aa993b | 213 | if (REGISTER_RAW_SIZE (regno) == 4) |
c906108c SS |
214 | { |
215 | /* copying 4 bytes from eight bytes? | |
216 | I don't see how this can be right... */ | |
c5aa993b | 217 | srcp += 4; |
c906108c SS |
218 | } |
219 | else | |
220 | { | |
221 | /* copy all 8 bytes (sizeof(double)) */ | |
222 | *dstp++ = *srcp++; | |
223 | *dstp++ = *srcp++; | |
224 | *dstp++ = *srcp++; | |
225 | *dstp++ = *srcp++; | |
226 | } | |
227 | } | |
228 | else | |
229 | { | |
230 | srcp += 4; | |
231 | *dstp++ = *srcp++; | |
232 | *dstp++ = *srcp++; | |
233 | *dstp++ = *srcp++; | |
234 | *dstp++ = *srcp++; | |
235 | } | |
236 | } | |
237 | } | |
238 | else | |
239 | { | |
240 | warning ("wrong size gregset struct in core file"); | |
241 | return; | |
242 | } | |
243 | ||
244 | registers_fetched (); | |
245 | } | |
246 | \f | |
247 | /* Irix 5 uses what appears to be a unique form of shared library | |
248 | support. This is a copy of solib.c modified for Irix 5. */ | |
249 | /* FIXME: Most of this code could be merged with osfsolib.c and solib.c | |
250 | by using next_link_map_member and xfer_link_map_member in solib.c. */ | |
251 | ||
252 | #include <sys/types.h> | |
253 | #include <signal.h> | |
254 | #include <sys/param.h> | |
255 | #include <fcntl.h> | |
256 | ||
257 | /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts | |
258 | with our versions of those files included by tm-mips.h. Prevent | |
259 | <obj.h> from including them with some appropriate defines. */ | |
260 | #define __SYM_H__ | |
261 | #define __SYMCONST_H__ | |
262 | #include <obj.h> | |
263 | #ifdef HAVE_OBJLIST_H | |
264 | #include <objlist.h> | |
265 | #endif | |
266 | ||
267 | #ifdef NEW_OBJ_INFO_MAGIC | |
268 | #define HANDLE_NEW_OBJ_LIST | |
269 | #endif | |
270 | ||
271 | #include "symtab.h" | |
272 | #include "bfd.h" | |
273 | #include "symfile.h" | |
274 | #include "objfiles.h" | |
275 | #include "command.h" | |
276 | #include "frame.h" | |
88987551 | 277 | #include "gdb_regex.h" |
c906108c SS |
278 | #include "inferior.h" |
279 | #include "language.h" | |
280 | #include "gdbcmd.h" | |
281 | ||
282 | /* The symbol which starts off the list of shared libraries. */ | |
283 | #define DEBUG_BASE "__rld_obj_head" | |
284 | ||
285 | /* Irix 6.x introduces a new variant of object lists. | |
286 | To be able to debug O32 executables under Irix 6, we have to handle both | |
287 | variants. */ | |
288 | ||
289 | typedef enum | |
290 | { | |
c5aa993b JM |
291 | OBJ_LIST_OLD, /* Pre Irix 6.x object list. */ |
292 | OBJ_LIST_32, /* 32 Bit Elf32_Obj_Info. */ | |
293 | OBJ_LIST_64 /* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */ | |
294 | } | |
295 | obj_list_variant; | |
c906108c SS |
296 | |
297 | /* Define our own link_map structure. | |
298 | This will help to share code with osfsolib.c and solib.c. */ | |
299 | ||
c5aa993b JM |
300 | struct link_map |
301 | { | |
302 | obj_list_variant l_variant; /* which variant of object list */ | |
303 | CORE_ADDR l_lladdr; /* addr in inferior list was read from */ | |
304 | CORE_ADDR l_next; /* address of next object list entry */ | |
305 | }; | |
c906108c SS |
306 | |
307 | /* Irix 5 shared objects are pre-linked to particular addresses | |
308 | although the dynamic linker may have to relocate them if the | |
309 | address ranges of the libraries used by the main program clash. | |
310 | The offset is the difference between the address where the object | |
311 | is mapped and the binding address of the shared library. */ | |
312 | #define LM_OFFSET(so) ((so) -> offset) | |
313 | /* Loaded address of shared library. */ | |
314 | #define LM_ADDR(so) ((so) -> lmstart) | |
315 | ||
316 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ | |
317 | ||
c5aa993b JM |
318 | struct so_list |
319 | { | |
320 | struct so_list *next; /* next structure in linked list */ | |
321 | struct link_map lm; | |
322 | CORE_ADDR offset; /* prelink to load address offset */ | |
323 | char *so_name; /* shared object lib name */ | |
324 | CORE_ADDR lmstart; /* lower addr bound of mapped object */ | |
325 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
326 | char symbols_loaded; /* flag: symbols read in yet? */ | |
327 | char from_tty; /* flag: print msgs? */ | |
328 | struct objfile *objfile; /* objfile for loaded lib */ | |
329 | struct section_table *sections; | |
330 | struct section_table *sections_end; | |
331 | struct section_table *textsection; | |
332 | bfd *abfd; | |
333 | }; | |
c906108c SS |
334 | |
335 | static struct so_list *so_list_head; /* List of known shared objects */ | |
c5aa993b | 336 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
c906108c SS |
337 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ |
338 | ||
339 | /* Local function prototypes */ | |
340 | ||
a14ed312 | 341 | static void sharedlibrary_command (char *, int); |
c906108c | 342 | |
a14ed312 | 343 | static int enable_break (void); |
c906108c | 344 | |
a14ed312 | 345 | static int disable_break (void); |
c906108c | 346 | |
a14ed312 | 347 | static void info_sharedlibrary_command (char *, int); |
c906108c | 348 | |
ac2e2ef7 | 349 | static int symbol_add_stub (void *); |
c906108c | 350 | |
a14ed312 | 351 | static struct so_list *find_solib (struct so_list *); |
c906108c | 352 | |
a14ed312 | 353 | static struct link_map *first_link_map_member (void); |
c906108c | 354 | |
a14ed312 | 355 | static struct link_map *next_link_map_member (struct so_list *); |
c906108c | 356 | |
a14ed312 | 357 | static void xfer_link_map_member (struct so_list *, struct link_map *); |
c906108c | 358 | |
a14ed312 | 359 | static CORE_ADDR locate_base (void); |
c906108c | 360 | |
ac2e2ef7 | 361 | static int solib_map_sections (void *); |
c906108c SS |
362 | |
363 | /* | |
364 | ||
c5aa993b | 365 | LOCAL FUNCTION |
c906108c | 366 | |
c5aa993b | 367 | solib_map_sections -- open bfd and build sections for shared lib |
c906108c | 368 | |
c5aa993b | 369 | SYNOPSIS |
c906108c | 370 | |
c5aa993b | 371 | static int solib_map_sections (struct so_list *so) |
c906108c | 372 | |
c5aa993b | 373 | DESCRIPTION |
c906108c | 374 | |
c5aa993b JM |
375 | Given a pointer to one of the shared objects in our list |
376 | of mapped objects, use the recorded name to open a bfd | |
377 | descriptor for the object, build a section table, and then | |
378 | relocate all the section addresses by the base address at | |
379 | which the shared object was mapped. | |
c906108c | 380 | |
c5aa993b | 381 | FIXMES |
c906108c | 382 | |
c5aa993b JM |
383 | In most (all?) cases the shared object file name recorded in the |
384 | dynamic linkage tables will be a fully qualified pathname. For | |
385 | cases where it isn't, do we really mimic the systems search | |
386 | mechanism correctly in the below code (particularly the tilde | |
387 | expansion stuff?). | |
c906108c SS |
388 | */ |
389 | ||
390 | static int | |
ac2e2ef7 | 391 | solib_map_sections (void *arg) |
c906108c SS |
392 | { |
393 | struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ | |
394 | char *filename; | |
395 | char *scratch_pathname; | |
396 | int scratch_chan; | |
397 | struct section_table *p; | |
398 | struct cleanup *old_chain; | |
399 | bfd *abfd; | |
c5aa993b JM |
400 | |
401 | filename = tilde_expand (so->so_name); | |
c906108c | 402 | old_chain = make_cleanup (free, filename); |
c5aa993b | 403 | |
c906108c SS |
404 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
405 | &scratch_pathname); | |
406 | if (scratch_chan < 0) | |
407 | { | |
408 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, | |
409 | O_RDONLY, 0, &scratch_pathname); | |
410 | } | |
411 | if (scratch_chan < 0) | |
412 | { | |
413 | perror_with_name (filename); | |
414 | } | |
415 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ | |
416 | ||
417 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); | |
418 | if (!abfd) | |
419 | { | |
420 | close (scratch_chan); | |
421 | error ("Could not open `%s' as an executable file: %s", | |
422 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
423 | } | |
424 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ | |
c5aa993b JM |
425 | so->abfd = abfd; |
426 | abfd->cacheable = true; | |
c906108c SS |
427 | |
428 | if (!bfd_check_format (abfd, bfd_object)) | |
429 | { | |
430 | error ("\"%s\": not in executable format: %s.", | |
431 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
432 | } | |
c5aa993b | 433 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
c906108c | 434 | { |
c5aa993b | 435 | error ("Can't find the file sections in `%s': %s", |
c906108c SS |
436 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
437 | } | |
438 | ||
c5aa993b | 439 | for (p = so->sections; p < so->sections_end; p++) |
c906108c SS |
440 | { |
441 | /* Relocate the section binding addresses as recorded in the shared | |
c5aa993b JM |
442 | object's file by the offset to get the address to which the |
443 | object was actually mapped. */ | |
444 | p->addr += LM_OFFSET (so); | |
445 | p->endaddr += LM_OFFSET (so); | |
446 | so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend); | |
447 | if (STREQ (p->the_bfd_section->name, ".text")) | |
c906108c | 448 | { |
c5aa993b | 449 | so->textsection = p; |
c906108c SS |
450 | } |
451 | } | |
452 | ||
453 | /* Free the file names, close the file now. */ | |
454 | do_cleanups (old_chain); | |
455 | ||
ac2e2ef7 | 456 | /* must be non-zero */ |
c906108c SS |
457 | return (1); |
458 | } | |
459 | ||
460 | /* | |
461 | ||
c5aa993b | 462 | LOCAL FUNCTION |
c906108c | 463 | |
c5aa993b | 464 | locate_base -- locate the base address of dynamic linker structs |
c906108c | 465 | |
c5aa993b | 466 | SYNOPSIS |
c906108c | 467 | |
c5aa993b | 468 | CORE_ADDR locate_base (void) |
c906108c | 469 | |
c5aa993b | 470 | DESCRIPTION |
c906108c | 471 | |
c5aa993b JM |
472 | For both the SunOS and SVR4 shared library implementations, if the |
473 | inferior executable has been linked dynamically, there is a single | |
474 | address somewhere in the inferior's data space which is the key to | |
475 | locating all of the dynamic linker's runtime structures. This | |
476 | address is the value of the symbol defined by the macro DEBUG_BASE. | |
477 | The job of this function is to find and return that address, or to | |
478 | return 0 if there is no such address (the executable is statically | |
479 | linked for example). | |
c906108c | 480 | |
c5aa993b JM |
481 | For SunOS, the job is almost trivial, since the dynamic linker and |
482 | all of it's structures are statically linked to the executable at | |
483 | link time. Thus the symbol for the address we are looking for has | |
484 | already been added to the minimal symbol table for the executable's | |
485 | objfile at the time the symbol file's symbols were read, and all we | |
486 | have to do is look it up there. Note that we explicitly do NOT want | |
487 | to find the copies in the shared library. | |
c906108c | 488 | |
c5aa993b JM |
489 | The SVR4 version is much more complicated because the dynamic linker |
490 | and it's structures are located in the shared C library, which gets | |
491 | run as the executable's "interpreter" by the kernel. We have to go | |
492 | to a lot more work to discover the address of DEBUG_BASE. Because | |
493 | of this complexity, we cache the value we find and return that value | |
494 | on subsequent invocations. Note there is no copy in the executable | |
495 | symbol tables. | |
c906108c | 496 | |
c5aa993b | 497 | Irix 5 is basically like SunOS. |
c906108c | 498 | |
c5aa993b JM |
499 | Note that we can assume nothing about the process state at the time |
500 | we need to find this address. We may be stopped on the first instruc- | |
501 | tion of the interpreter (C shared library), the first instruction of | |
502 | the executable itself, or somewhere else entirely (if we attached | |
503 | to the process for example). | |
c906108c SS |
504 | |
505 | */ | |
506 | ||
507 | static CORE_ADDR | |
fba45db2 | 508 | locate_base (void) |
c906108c SS |
509 | { |
510 | struct minimal_symbol *msymbol; | |
511 | CORE_ADDR address = 0; | |
512 | ||
513 | msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile); | |
514 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
515 | { | |
516 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
517 | } | |
518 | return (address); | |
519 | } | |
520 | ||
521 | /* | |
522 | ||
c5aa993b | 523 | LOCAL FUNCTION |
c906108c | 524 | |
c5aa993b | 525 | first_link_map_member -- locate first member in dynamic linker's map |
c906108c | 526 | |
c5aa993b | 527 | SYNOPSIS |
c906108c | 528 | |
c5aa993b | 529 | static struct link_map *first_link_map_member (void) |
c906108c | 530 | |
c5aa993b | 531 | DESCRIPTION |
c906108c | 532 | |
c5aa993b JM |
533 | Read in a copy of the first member in the inferior's dynamic |
534 | link map from the inferior's dynamic linker structures, and return | |
535 | a pointer to the link map descriptor. | |
536 | */ | |
c906108c SS |
537 | |
538 | static struct link_map * | |
fba45db2 | 539 | first_link_map_member (void) |
c906108c SS |
540 | { |
541 | struct obj_list *listp; | |
542 | struct obj_list list_old; | |
543 | struct link_map *lm; | |
544 | static struct link_map first_lm; | |
545 | CORE_ADDR lladdr; | |
546 | CORE_ADDR next_lladdr; | |
547 | ||
548 | /* We have not already read in the dynamic linking structures | |
549 | from the inferior, lookup the address of the base structure. */ | |
550 | debug_base = locate_base (); | |
551 | if (debug_base == 0) | |
552 | return NULL; | |
553 | ||
554 | /* Get address of first list entry. */ | |
555 | read_memory (debug_base, (char *) &listp, sizeof (struct obj_list *)); | |
556 | ||
557 | if (listp == NULL) | |
558 | return NULL; | |
559 | ||
560 | /* Get first list entry. */ | |
ac2e2ef7 AC |
561 | /* The MIPS Sign extends addresses. */ |
562 | lladdr = host_pointer_to_address (listp); | |
c906108c SS |
563 | read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); |
564 | ||
565 | /* The first entry in the list is the object file we are debugging, | |
566 | so skip it. */ | |
ac2e2ef7 | 567 | next_lladdr = host_pointer_to_address (list_old.next); |
c906108c SS |
568 | |
569 | #ifdef HANDLE_NEW_OBJ_LIST | |
570 | if (list_old.data == NEW_OBJ_INFO_MAGIC) | |
571 | { | |
572 | Elf32_Obj_Info list_32; | |
573 | ||
574 | read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); | |
575 | if (list_32.oi_size != sizeof (Elf32_Obj_Info)) | |
576 | return NULL; | |
c5aa993b | 577 | next_lladdr = (CORE_ADDR) list_32.oi_next; |
c906108c SS |
578 | } |
579 | #endif | |
580 | ||
581 | if (next_lladdr == 0) | |
582 | return NULL; | |
583 | ||
584 | first_lm.l_lladdr = next_lladdr; | |
585 | lm = &first_lm; | |
586 | return lm; | |
587 | } | |
588 | ||
589 | /* | |
590 | ||
c5aa993b | 591 | LOCAL FUNCTION |
c906108c | 592 | |
c5aa993b | 593 | next_link_map_member -- locate next member in dynamic linker's map |
c906108c | 594 | |
c5aa993b | 595 | SYNOPSIS |
c906108c | 596 | |
c5aa993b | 597 | static struct link_map *next_link_map_member (so_list_ptr) |
c906108c | 598 | |
c5aa993b | 599 | DESCRIPTION |
c906108c | 600 | |
c5aa993b JM |
601 | Read in a copy of the next member in the inferior's dynamic |
602 | link map from the inferior's dynamic linker structures, and return | |
603 | a pointer to the link map descriptor. | |
604 | */ | |
c906108c SS |
605 | |
606 | static struct link_map * | |
fba45db2 | 607 | next_link_map_member (struct so_list *so_list_ptr) |
c906108c | 608 | { |
c5aa993b JM |
609 | struct link_map *lm = &so_list_ptr->lm; |
610 | CORE_ADDR next_lladdr = lm->l_next; | |
c906108c SS |
611 | static struct link_map next_lm; |
612 | ||
613 | if (next_lladdr == 0) | |
614 | { | |
615 | /* We have hit the end of the list, so check to see if any were | |
c5aa993b | 616 | added, but be quiet if we can't read from the target any more. */ |
c906108c SS |
617 | int status = 0; |
618 | ||
c5aa993b | 619 | if (lm->l_variant == OBJ_LIST_OLD) |
c906108c SS |
620 | { |
621 | struct obj_list list_old; | |
622 | ||
c5aa993b | 623 | status = target_read_memory (lm->l_lladdr, |
c906108c SS |
624 | (char *) &list_old, |
625 | sizeof (struct obj_list)); | |
ac2e2ef7 | 626 | next_lladdr = host_pointer_to_address (list_old.next); |
c906108c SS |
627 | } |
628 | #ifdef HANDLE_NEW_OBJ_LIST | |
c5aa993b | 629 | else if (lm->l_variant == OBJ_LIST_32) |
c906108c SS |
630 | { |
631 | Elf32_Obj_Info list_32; | |
c5aa993b | 632 | status = target_read_memory (lm->l_lladdr, |
c906108c SS |
633 | (char *) &list_32, |
634 | sizeof (Elf32_Obj_Info)); | |
635 | next_lladdr = (CORE_ADDR) list_32.oi_next; | |
636 | } | |
637 | #endif | |
638 | ||
639 | if (status != 0 || next_lladdr == 0) | |
640 | return NULL; | |
641 | } | |
642 | ||
643 | next_lm.l_lladdr = next_lladdr; | |
644 | lm = &next_lm; | |
645 | return lm; | |
646 | } | |
647 | ||
648 | /* | |
649 | ||
c5aa993b | 650 | LOCAL FUNCTION |
c906108c | 651 | |
c5aa993b | 652 | xfer_link_map_member -- set local variables from dynamic linker's map |
c906108c | 653 | |
c5aa993b | 654 | SYNOPSIS |
c906108c | 655 | |
c5aa993b | 656 | static void xfer_link_map_member (so_list_ptr, lm) |
c906108c | 657 | |
c5aa993b | 658 | DESCRIPTION |
c906108c | 659 | |
c5aa993b JM |
660 | Read in a copy of the requested member in the inferior's dynamic |
661 | link map from the inferior's dynamic linker structures, and fill | |
662 | in the necessary so_list_ptr elements. | |
663 | */ | |
c906108c SS |
664 | |
665 | static void | |
fba45db2 | 666 | xfer_link_map_member (struct so_list *so_list_ptr, struct link_map *lm) |
c906108c SS |
667 | { |
668 | struct obj_list list_old; | |
c5aa993b JM |
669 | CORE_ADDR lladdr = lm->l_lladdr; |
670 | struct link_map *new_lm = &so_list_ptr->lm; | |
c906108c SS |
671 | int errcode; |
672 | ||
673 | read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); | |
674 | ||
c5aa993b JM |
675 | new_lm->l_variant = OBJ_LIST_OLD; |
676 | new_lm->l_lladdr = lladdr; | |
ac2e2ef7 | 677 | new_lm->l_next = host_pointer_to_address (list_old.next); |
c906108c SS |
678 | |
679 | #ifdef HANDLE_NEW_OBJ_LIST | |
680 | if (list_old.data == NEW_OBJ_INFO_MAGIC) | |
681 | { | |
682 | Elf32_Obj_Info list_32; | |
683 | ||
684 | read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); | |
685 | if (list_32.oi_size != sizeof (Elf32_Obj_Info)) | |
686 | return; | |
c5aa993b JM |
687 | new_lm->l_variant = OBJ_LIST_32; |
688 | new_lm->l_next = (CORE_ADDR) list_32.oi_next; | |
c906108c SS |
689 | |
690 | target_read_string ((CORE_ADDR) list_32.oi_pathname, | |
c5aa993b | 691 | &so_list_ptr->so_name, |
c906108c SS |
692 | list_32.oi_pathname_len + 1, &errcode); |
693 | if (errcode != 0) | |
694 | memory_error (errcode, (CORE_ADDR) list_32.oi_pathname); | |
695 | ||
696 | LM_ADDR (so_list_ptr) = (CORE_ADDR) list_32.oi_ehdr; | |
697 | LM_OFFSET (so_list_ptr) = | |
698 | (CORE_ADDR) list_32.oi_ehdr - (CORE_ADDR) list_32.oi_orig_ehdr; | |
699 | } | |
700 | else | |
701 | #endif | |
702 | { | |
703 | #if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32 | |
704 | /* If we are compiling GDB under N32 ABI, the alignments in | |
c5aa993b JM |
705 | the obj struct are different from the O32 ABI and we will get |
706 | wrong values when accessing the struct. | |
707 | As a workaround we use fixed values which are good for | |
708 | Irix 6.2. */ | |
c906108c SS |
709 | char buf[432]; |
710 | ||
711 | read_memory ((CORE_ADDR) list_old.data, buf, sizeof (buf)); | |
712 | ||
713 | target_read_string (extract_address (&buf[236], 4), | |
c5aa993b | 714 | &so_list_ptr->so_name, |
c906108c SS |
715 | INT_MAX, &errcode); |
716 | if (errcode != 0) | |
717 | memory_error (errcode, extract_address (&buf[236], 4)); | |
718 | ||
719 | LM_ADDR (so_list_ptr) = extract_address (&buf[196], 4); | |
720 | LM_OFFSET (so_list_ptr) = | |
721 | extract_address (&buf[196], 4) - extract_address (&buf[248], 4); | |
722 | #else | |
723 | struct obj obj_old; | |
724 | ||
725 | read_memory ((CORE_ADDR) list_old.data, (char *) &obj_old, | |
726 | sizeof (struct obj)); | |
727 | ||
728 | target_read_string ((CORE_ADDR) obj_old.o_path, | |
c5aa993b | 729 | &so_list_ptr->so_name, |
c906108c SS |
730 | INT_MAX, &errcode); |
731 | if (errcode != 0) | |
732 | memory_error (errcode, (CORE_ADDR) obj_old.o_path); | |
733 | ||
734 | LM_ADDR (so_list_ptr) = (CORE_ADDR) obj_old.o_praw; | |
735 | LM_OFFSET (so_list_ptr) = | |
736 | (CORE_ADDR) obj_old.o_praw - obj_old.o_base_address; | |
737 | #endif | |
738 | } | |
739 | ||
740 | catch_errors (solib_map_sections, (char *) so_list_ptr, | |
741 | "Error while mapping shared library sections:\n", | |
742 | RETURN_MASK_ALL); | |
743 | } | |
744 | ||
745 | ||
746 | /* | |
747 | ||
c5aa993b | 748 | LOCAL FUNCTION |
c906108c | 749 | |
c5aa993b | 750 | find_solib -- step through list of shared objects |
c906108c | 751 | |
c5aa993b | 752 | SYNOPSIS |
c906108c | 753 | |
c5aa993b | 754 | struct so_list *find_solib (struct so_list *so_list_ptr) |
c906108c | 755 | |
c5aa993b | 756 | DESCRIPTION |
c906108c | 757 | |
c5aa993b JM |
758 | This module contains the routine which finds the names of any |
759 | loaded "images" in the current process. The argument in must be | |
760 | NULL on the first call, and then the returned value must be passed | |
761 | in on subsequent calls. This provides the capability to "step" down | |
762 | the list of loaded objects. On the last object, a NULL value is | |
763 | returned. | |
c906108c SS |
764 | */ |
765 | ||
766 | static struct so_list * | |
767 | find_solib (so_list_ptr) | |
768 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
769 | { | |
770 | struct so_list *so_list_next = NULL; | |
771 | struct link_map *lm = NULL; | |
772 | struct so_list *new; | |
c5aa993b | 773 | |
c906108c SS |
774 | if (so_list_ptr == NULL) |
775 | { | |
776 | /* We are setting up for a new scan through the loaded images. */ | |
777 | if ((so_list_next = so_list_head) == NULL) | |
778 | { | |
779 | /* Find the first link map list member. */ | |
780 | lm = first_link_map_member (); | |
781 | } | |
782 | } | |
783 | else | |
784 | { | |
785 | /* We have been called before, and are in the process of walking | |
c5aa993b | 786 | the shared library list. Advance to the next shared object. */ |
c906108c | 787 | lm = next_link_map_member (so_list_ptr); |
c5aa993b | 788 | so_list_next = so_list_ptr->next; |
c906108c SS |
789 | } |
790 | if ((so_list_next == NULL) && (lm != NULL)) | |
791 | { | |
792 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
793 | memset ((char *) new, 0, sizeof (struct so_list)); | |
794 | /* Add the new node as the next node in the list, or as the root | |
c5aa993b | 795 | node if this is the first one. */ |
c906108c SS |
796 | if (so_list_ptr != NULL) |
797 | { | |
c5aa993b | 798 | so_list_ptr->next = new; |
c906108c SS |
799 | } |
800 | else | |
801 | { | |
802 | so_list_head = new; | |
c5aa993b | 803 | } |
c906108c SS |
804 | so_list_next = new; |
805 | xfer_link_map_member (new, lm); | |
806 | } | |
807 | return (so_list_next); | |
808 | } | |
809 | ||
810 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ | |
811 | ||
812 | static int | |
ac2e2ef7 | 813 | symbol_add_stub (void *arg) |
c906108c | 814 | { |
c5aa993b | 815 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
c906108c | 816 | CORE_ADDR text_addr = 0; |
2acceee2 | 817 | struct section_addr_info section_addrs; |
c906108c | 818 | |
2acceee2 | 819 | memset (§ion_addrs, 0, sizeof (section_addrs)); |
c5aa993b JM |
820 | if (so->textsection) |
821 | text_addr = so->textsection->addr; | |
822 | else if (so->abfd != NULL) | |
c906108c SS |
823 | { |
824 | asection *lowest_sect; | |
825 | ||
826 | /* If we didn't find a mapped non zero sized .text section, set up | |
c5aa993b | 827 | text_addr so that the relocation in symbol_file_add does no harm. */ |
c906108c | 828 | |
c5aa993b | 829 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); |
c906108c | 830 | if (lowest_sect == NULL) |
c5aa993b | 831 | bfd_map_over_sections (so->abfd, find_lowest_section, |
96baa820 | 832 | (PTR) &lowest_sect); |
c906108c | 833 | if (lowest_sect) |
c5aa993b | 834 | text_addr = bfd_section_vma (so->abfd, lowest_sect) + LM_OFFSET (so); |
c906108c | 835 | } |
c5aa993b | 836 | |
a034fba4 EZ |
837 | |
838 | section_addrs.other[0].name = ".text"; | |
839 | section_addrs.other[0].addr = text_addr; | |
c5aa993b | 840 | so->objfile = symbol_file_add (so->so_name, so->from_tty, |
2df3850c | 841 | §ion_addrs, 0, 0); |
ac2e2ef7 | 842 | /* must be non-zero */ |
c906108c SS |
843 | return (1); |
844 | } | |
845 | ||
846 | /* | |
847 | ||
c5aa993b | 848 | GLOBAL FUNCTION |
c906108c | 849 | |
c5aa993b | 850 | solib_add -- add a shared library file to the symtab and section list |
c906108c | 851 | |
c5aa993b | 852 | SYNOPSIS |
c906108c | 853 | |
c5aa993b JM |
854 | void solib_add (char *arg_string, int from_tty, |
855 | struct target_ops *target) | |
c906108c | 856 | |
c5aa993b | 857 | DESCRIPTION |
c906108c | 858 | |
c5aa993b | 859 | */ |
c906108c SS |
860 | |
861 | void | |
fba45db2 | 862 | solib_add (char *arg_string, int from_tty, struct target_ops *target) |
c5aa993b JM |
863 | { |
864 | register struct so_list *so = NULL; /* link map state variable */ | |
c906108c SS |
865 | |
866 | /* Last shared library that we read. */ | |
867 | struct so_list *so_last = NULL; | |
868 | ||
869 | char *re_err; | |
870 | int count; | |
871 | int old; | |
c5aa993b | 872 | |
c906108c SS |
873 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
874 | { | |
875 | error ("Invalid regexp: %s", re_err); | |
876 | } | |
c5aa993b | 877 | |
c906108c SS |
878 | /* Add the shared library sections to the section table of the |
879 | specified target, if any. */ | |
880 | if (target) | |
881 | { | |
882 | /* Count how many new section_table entries there are. */ | |
883 | so = NULL; | |
884 | count = 0; | |
885 | while ((so = find_solib (so)) != NULL) | |
886 | { | |
c5aa993b | 887 | if (so->so_name[0]) |
c906108c | 888 | { |
c5aa993b | 889 | count += so->sections_end - so->sections; |
c906108c SS |
890 | } |
891 | } | |
c5aa993b | 892 | |
c906108c SS |
893 | if (count) |
894 | { | |
6426a772 JM |
895 | old = target_resize_to_sections (target, count); |
896 | ||
c906108c SS |
897 | /* Add these section table entries to the target's table. */ |
898 | while ((so = find_solib (so)) != NULL) | |
899 | { | |
c5aa993b | 900 | if (so->so_name[0]) |
c906108c | 901 | { |
c5aa993b JM |
902 | count = so->sections_end - so->sections; |
903 | memcpy ((char *) (target->to_sections + old), | |
904 | so->sections, | |
c906108c SS |
905 | (sizeof (struct section_table)) * count); |
906 | old += count; | |
907 | } | |
908 | } | |
909 | } | |
910 | } | |
c5aa993b | 911 | |
c906108c SS |
912 | /* Now add the symbol files. */ |
913 | while ((so = find_solib (so)) != NULL) | |
914 | { | |
c5aa993b | 915 | if (so->so_name[0] && re_exec (so->so_name)) |
c906108c | 916 | { |
c5aa993b JM |
917 | so->from_tty = from_tty; |
918 | if (so->symbols_loaded) | |
c906108c SS |
919 | { |
920 | if (from_tty) | |
921 | { | |
c5aa993b | 922 | printf_unfiltered ("Symbols already loaded for %s\n", so->so_name); |
c906108c SS |
923 | } |
924 | } | |
925 | else if (catch_errors | |
926 | (symbol_add_stub, (char *) so, | |
927 | "Error while reading shared library symbols:\n", | |
928 | RETURN_MASK_ALL)) | |
929 | { | |
930 | so_last = so; | |
c5aa993b | 931 | so->symbols_loaded = 1; |
c906108c SS |
932 | } |
933 | } | |
934 | } | |
935 | ||
936 | /* Getting new symbols may change our opinion about what is | |
937 | frameless. */ | |
938 | if (so_last) | |
939 | reinit_frame_cache (); | |
940 | } | |
941 | ||
942 | /* | |
943 | ||
c5aa993b | 944 | LOCAL FUNCTION |
c906108c | 945 | |
c5aa993b | 946 | info_sharedlibrary_command -- code for "info sharedlibrary" |
c906108c | 947 | |
c5aa993b | 948 | SYNOPSIS |
c906108c | 949 | |
c5aa993b | 950 | static void info_sharedlibrary_command () |
c906108c | 951 | |
c5aa993b | 952 | DESCRIPTION |
c906108c | 953 | |
c5aa993b JM |
954 | Walk through the shared library list and print information |
955 | about each attached library. | |
956 | */ | |
c906108c SS |
957 | |
958 | static void | |
fba45db2 | 959 | info_sharedlibrary_command (char *ignore, int from_tty) |
c906108c | 960 | { |
c5aa993b | 961 | register struct so_list *so = NULL; /* link map state variable */ |
c906108c | 962 | int header_done = 0; |
c5aa993b | 963 | |
c906108c SS |
964 | if (exec_bfd == NULL) |
965 | { | |
4ce44c66 | 966 | printf_unfiltered ("No executable file.\n"); |
c906108c SS |
967 | return; |
968 | } | |
969 | while ((so = find_solib (so)) != NULL) | |
970 | { | |
c5aa993b | 971 | if (so->so_name[0]) |
c906108c SS |
972 | { |
973 | if (!header_done) | |
974 | { | |
c5aa993b JM |
975 | printf_unfiltered ("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", |
976 | "Shared Object Library"); | |
c906108c SS |
977 | header_done++; |
978 | } | |
979 | printf_unfiltered ("%-12s", | |
c5aa993b JM |
980 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
981 | "08l")); | |
c906108c | 982 | printf_unfiltered ("%-12s", |
c5aa993b JM |
983 | local_hex_string_custom ((unsigned long) so->lmend, |
984 | "08l")); | |
985 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); | |
986 | printf_unfiltered ("%s\n", so->so_name); | |
c906108c SS |
987 | } |
988 | } | |
989 | if (so_list_head == NULL) | |
990 | { | |
c5aa993b | 991 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
c906108c SS |
992 | } |
993 | } | |
994 | ||
995 | /* | |
996 | ||
c5aa993b | 997 | GLOBAL FUNCTION |
c906108c | 998 | |
c5aa993b | 999 | solib_address -- check to see if an address is in a shared lib |
c906108c | 1000 | |
c5aa993b | 1001 | SYNOPSIS |
c906108c | 1002 | |
c5aa993b | 1003 | char *solib_address (CORE_ADDR address) |
c906108c | 1004 | |
c5aa993b | 1005 | DESCRIPTION |
c906108c | 1006 | |
c5aa993b JM |
1007 | Provides a hook for other gdb routines to discover whether or |
1008 | not a particular address is within the mapped address space of | |
1009 | a shared library. Any address between the base mapping address | |
1010 | and the first address beyond the end of the last mapping, is | |
1011 | considered to be within the shared library address space, for | |
1012 | our purposes. | |
c906108c | 1013 | |
c5aa993b JM |
1014 | For example, this routine is called at one point to disable |
1015 | breakpoints which are in shared libraries that are not currently | |
1016 | mapped in. | |
c906108c SS |
1017 | */ |
1018 | ||
1019 | char * | |
fba45db2 | 1020 | solib_address (CORE_ADDR address) |
c906108c | 1021 | { |
c5aa993b JM |
1022 | register struct so_list *so = 0; /* link map state variable */ |
1023 | ||
c906108c SS |
1024 | while ((so = find_solib (so)) != NULL) |
1025 | { | |
c5aa993b | 1026 | if (so->so_name[0]) |
c906108c SS |
1027 | { |
1028 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
c5aa993b | 1029 | (address < (CORE_ADDR) so->lmend)) |
c906108c SS |
1030 | return (so->so_name); |
1031 | } | |
1032 | } | |
1033 | return (0); | |
1034 | } | |
1035 | ||
1036 | /* Called by free_all_symtabs */ | |
1037 | ||
c5aa993b | 1038 | void |
fba45db2 | 1039 | clear_solib (void) |
c906108c SS |
1040 | { |
1041 | struct so_list *next; | |
1042 | char *bfd_filename; | |
c5aa993b | 1043 | |
c906108c SS |
1044 | disable_breakpoints_in_shlibs (1); |
1045 | ||
1046 | while (so_list_head) | |
1047 | { | |
c5aa993b | 1048 | if (so_list_head->sections) |
c906108c | 1049 | { |
c5aa993b | 1050 | free ((PTR) so_list_head->sections); |
c906108c | 1051 | } |
c5aa993b | 1052 | if (so_list_head->abfd) |
c906108c | 1053 | { |
c5aa993b JM |
1054 | bfd_filename = bfd_get_filename (so_list_head->abfd); |
1055 | if (!bfd_close (so_list_head->abfd)) | |
c906108c SS |
1056 | warning ("cannot close \"%s\": %s", |
1057 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
1058 | } | |
1059 | else | |
1060 | /* This happens for the executable on SVR4. */ | |
1061 | bfd_filename = NULL; | |
1062 | ||
c5aa993b | 1063 | next = so_list_head->next; |
c906108c | 1064 | if (bfd_filename) |
c5aa993b | 1065 | free ((PTR) bfd_filename); |
c906108c | 1066 | free (so_list_head->so_name); |
c5aa993b | 1067 | free ((PTR) so_list_head); |
c906108c SS |
1068 | so_list_head = next; |
1069 | } | |
1070 | debug_base = 0; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | ||
c5aa993b | 1075 | LOCAL FUNCTION |
c906108c | 1076 | |
c5aa993b | 1077 | disable_break -- remove the "mapping changed" breakpoint |
c906108c | 1078 | |
c5aa993b | 1079 | SYNOPSIS |
c906108c | 1080 | |
c5aa993b | 1081 | static int disable_break () |
c906108c | 1082 | |
c5aa993b | 1083 | DESCRIPTION |
c906108c | 1084 | |
c5aa993b JM |
1085 | Removes the breakpoint that gets hit when the dynamic linker |
1086 | completes a mapping change. | |
c906108c | 1087 | |
c5aa993b | 1088 | */ |
c906108c SS |
1089 | |
1090 | static int | |
fba45db2 | 1091 | disable_break (void) |
c906108c SS |
1092 | { |
1093 | int status = 1; | |
1094 | ||
1095 | ||
1096 | /* Note that breakpoint address and original contents are in our address | |
1097 | space, so we just need to write the original contents back. */ | |
1098 | ||
1099 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1100 | { | |
1101 | status = 0; | |
1102 | } | |
1103 | ||
1104 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1105 | SunOS version we don't know it until the above code is executed. | |
1106 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1107 | ||
1108 | if (stop_pc != breakpoint_addr) | |
1109 | { | |
1110 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1111 | } | |
1112 | ||
1113 | return (status); | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | ||
c5aa993b | 1118 | LOCAL FUNCTION |
c906108c | 1119 | |
c5aa993b | 1120 | enable_break -- arrange for dynamic linker to hit breakpoint |
c906108c | 1121 | |
c5aa993b | 1122 | SYNOPSIS |
c906108c | 1123 | |
c5aa993b | 1124 | int enable_break (void) |
c906108c | 1125 | |
c5aa993b | 1126 | DESCRIPTION |
c906108c | 1127 | |
c5aa993b JM |
1128 | This functions inserts a breakpoint at the entry point of the |
1129 | main executable, where all shared libraries are mapped in. | |
1130 | */ | |
c906108c SS |
1131 | |
1132 | static int | |
fba45db2 | 1133 | enable_break (void) |
c906108c SS |
1134 | { |
1135 | if (symfile_objfile != NULL | |
1136 | && target_insert_breakpoint (symfile_objfile->ei.entry_point, | |
1137 | shadow_contents) == 0) | |
1138 | { | |
1139 | breakpoint_addr = symfile_objfile->ei.entry_point; | |
1140 | return 1; | |
1141 | } | |
1142 | ||
1143 | return 0; | |
1144 | } | |
c5aa993b | 1145 | |
c906108c | 1146 | /* |
c5aa993b JM |
1147 | |
1148 | GLOBAL FUNCTION | |
1149 | ||
1150 | solib_create_inferior_hook -- shared library startup support | |
1151 | ||
1152 | SYNOPSIS | |
1153 | ||
1154 | void solib_create_inferior_hook() | |
1155 | ||
1156 | DESCRIPTION | |
1157 | ||
1158 | When gdb starts up the inferior, it nurses it along (through the | |
1159 | shell) until it is ready to execute it's first instruction. At this | |
1160 | point, this function gets called via expansion of the macro | |
1161 | SOLIB_CREATE_INFERIOR_HOOK. | |
1162 | ||
1163 | For SunOS executables, this first instruction is typically the | |
1164 | one at "_start", or a similar text label, regardless of whether | |
1165 | the executable is statically or dynamically linked. The runtime | |
1166 | startup code takes care of dynamically linking in any shared | |
1167 | libraries, once gdb allows the inferior to continue. | |
1168 | ||
1169 | For SVR4 executables, this first instruction is either the first | |
1170 | instruction in the dynamic linker (for dynamically linked | |
1171 | executables) or the instruction at "start" for statically linked | |
1172 | executables. For dynamically linked executables, the system | |
1173 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1174 | and starts it running. The dynamic linker maps in any needed | |
1175 | shared libraries, maps in the actual user executable, and then | |
1176 | jumps to "start" in the user executable. | |
1177 | ||
1178 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1179 | can arrange to cooperate with the dynamic linker to discover the | |
1180 | names of shared libraries that are dynamically linked, and the | |
1181 | base addresses to which they are linked. | |
1182 | ||
1183 | This function is responsible for discovering those names and | |
1184 | addresses, and saving sufficient information about them to allow | |
1185 | their symbols to be read at a later time. | |
1186 | ||
1187 | FIXME | |
1188 | ||
1189 | Between enable_break() and disable_break(), this code does not | |
1190 | properly handle hitting breakpoints which the user might have | |
1191 | set in the startup code or in the dynamic linker itself. Proper | |
1192 | handling will probably have to wait until the implementation is | |
1193 | changed to use the "breakpoint handler function" method. | |
1194 | ||
1195 | Also, what if child has exit()ed? Must exit loop somehow. | |
1196 | */ | |
1197 | ||
1198 | void | |
fba45db2 | 1199 | solib_create_inferior_hook (void) |
c906108c SS |
1200 | { |
1201 | if (!enable_break ()) | |
1202 | { | |
1203 | warning ("shared library handler failed to enable breakpoint"); | |
1204 | return; | |
1205 | } | |
1206 | ||
1207 | /* Now run the target. It will eventually hit the breakpoint, at | |
1208 | which point all of the libraries will have been mapped in and we | |
1209 | can go groveling around in the dynamic linker structures to find | |
1210 | out what we need to know about them. */ | |
1211 | ||
1212 | clear_proceed_status (); | |
1213 | stop_soon_quietly = 1; | |
1214 | stop_signal = TARGET_SIGNAL_0; | |
1215 | do | |
1216 | { | |
1217 | target_resume (-1, 0, stop_signal); | |
1218 | wait_for_inferior (); | |
1219 | } | |
1220 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
c5aa993b | 1221 | |
c906108c SS |
1222 | /* We are now either at the "mapping complete" breakpoint (or somewhere |
1223 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1224 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1225 | add any shared libraries that were mapped in. */ | |
1226 | ||
1227 | if (DECR_PC_AFTER_BREAK) | |
1228 | { | |
1229 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1230 | write_register (PC_REGNUM, stop_pc); | |
1231 | } | |
1232 | ||
1233 | if (!disable_break ()) | |
1234 | { | |
1235 | warning ("shared library handler failed to disable breakpoint"); | |
1236 | } | |
1237 | ||
1238 | /* solib_add will call reinit_frame_cache. | |
c5aa993b JM |
1239 | But we are stopped in the startup code and we might not have symbols |
1240 | for the startup code, so heuristic_proc_start could be called | |
1241 | and will put out an annoying warning. | |
1242 | Delaying the resetting of stop_soon_quietly until after symbol loading | |
1243 | suppresses the warning. */ | |
c906108c SS |
1244 | if (auto_solib_add) |
1245 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
1246 | stop_soon_quietly = 0; | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | ||
c5aa993b | 1251 | LOCAL FUNCTION |
c906108c | 1252 | |
c5aa993b | 1253 | sharedlibrary_command -- handle command to explicitly add library |
c906108c | 1254 | |
c5aa993b | 1255 | SYNOPSIS |
c906108c | 1256 | |
c5aa993b | 1257 | static void sharedlibrary_command (char *args, int from_tty) |
c906108c | 1258 | |
c5aa993b | 1259 | DESCRIPTION |
c906108c | 1260 | |
c5aa993b | 1261 | */ |
c906108c SS |
1262 | |
1263 | static void | |
fba45db2 | 1264 | sharedlibrary_command (char *args, int from_tty) |
c906108c SS |
1265 | { |
1266 | dont_repeat (); | |
1267 | solib_add (args, from_tty, (struct target_ops *) 0); | |
1268 | } | |
1269 | ||
1270 | void | |
fba45db2 | 1271 | _initialize_solib (void) |
c906108c SS |
1272 | { |
1273 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
1274 | "Load shared object library symbols for files matching REGEXP."); | |
c5aa993b | 1275 | add_info ("sharedlibrary", info_sharedlibrary_command, |
c906108c SS |
1276 | "Status of loaded shared object libraries."); |
1277 | ||
1278 | add_show_from_set | |
1279 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
1280 | (char *) &auto_solib_add, | |
1281 | "Set autoloading of shared library symbols.\n\ | |
1282 | If nonzero, symbols from all shared object libraries will be loaded\n\ | |
1283 | automatically when the inferior begins execution or when the dynamic linker\n\ | |
1284 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
1285 | must be loaded manually, using `sharedlibrary'.", | |
1286 | &setlist), | |
1287 | &showlist); | |
1288 | } | |
c906108c | 1289 | \f |
c5aa993b | 1290 | |
c906108c SS |
1291 | /* Register that we are able to handle irix5 core file formats. |
1292 | This really is bfd_target_unknown_flavour */ | |
1293 | ||
1294 | static struct core_fns irix5_core_fns = | |
1295 | { | |
2acceee2 JM |
1296 | bfd_target_unknown_flavour, /* core_flavour */ |
1297 | default_check_format, /* check_format */ | |
1298 | default_core_sniffer, /* core_sniffer */ | |
1299 | fetch_core_registers, /* core_read_registers */ | |
1300 | NULL /* next */ | |
c906108c SS |
1301 | }; |
1302 | ||
1303 | void | |
fba45db2 | 1304 | _initialize_core_irix5 (void) |
c906108c SS |
1305 | { |
1306 | add_core_fns (&irix5_core_fns); | |
1307 | } |