Commit | Line | Data |
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a2f1e2e5 | 1 | /* Native support for the SGI Iris running IRIX version 5, for GDB. |
87273c71 | 2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996 |
33c66e44 | 3 | Free Software Foundation, Inc. |
a2f1e2e5 ILT |
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 | |
6c9638b4 | 23 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
a2f1e2e5 ILT |
24 | |
25 | #include "defs.h" | |
26 | #include "inferior.h" | |
27 | #include "gdbcore.h" | |
28 | #include "target.h" | |
29 | ||
2b576293 | 30 | #include "gdb_string.h" |
a2f1e2e5 ILT |
31 | #include <sys/time.h> |
32 | #include <sys/procfs.h> | |
33 | #include <setjmp.h> /* For JB_XXX. */ | |
34 | ||
857dcde8 | 35 | static void |
948a9d92 | 36 | fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR)); |
857dcde8 | 37 | |
a2f1e2e5 ILT |
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]; | |
1d275068 | 55 | int gregoff = sizeof (greg_t) - MIPS_REGSIZE; |
3f403f6a | 56 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
a2f1e2e5 ILT |
57 | |
58 | for(regi = 0; regi <= CTX_RA; regi++) | |
1d275068 | 59 | supply_register (regi, (char *)(regp + regi) + gregoff); |
a2f1e2e5 | 60 | |
1d275068 PS |
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); | |
3f403f6a PS |
65 | |
66 | /* Fill inaccessible registers with zero. */ | |
67 | supply_register (BADVADDR_REGNUM, zerobuf); | |
a2f1e2e5 ILT |
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 | for (regi = 0; regi <= CTX_RA; regi++) | |
79 | if ((regno == -1) || (regno == regi)) | |
1d275068 PS |
80 | *(regp + regi) = |
81 | extract_address (®isters[REGISTER_BYTE (regi)], | |
82 | REGISTER_RAW_SIZE (regi)); | |
a2f1e2e5 ILT |
83 | |
84 | if ((regno == -1) || (regno == PC_REGNUM)) | |
1d275068 PS |
85 | *(regp + CTX_EPC) = |
86 | extract_address (®isters[REGISTER_BYTE (PC_REGNUM)], | |
87 | REGISTER_RAW_SIZE (PC_REGNUM)); | |
a2f1e2e5 ILT |
88 | |
89 | if ((regno == -1) || (regno == CAUSE_REGNUM)) | |
1d275068 PS |
90 | *(regp + CTX_CAUSE) = |
91 | extract_address (®isters[REGISTER_BYTE (CAUSE_REGNUM)], | |
92 | REGISTER_RAW_SIZE (CAUSE_REGNUM)); | |
a2f1e2e5 ILT |
93 | |
94 | if ((regno == -1) || (regno == HI_REGNUM)) | |
1d275068 PS |
95 | *(regp + CTX_MDHI) = |
96 | extract_address (®isters[REGISTER_BYTE (HI_REGNUM)], | |
97 | REGISTER_RAW_SIZE (HI_REGNUM)); | |
a2f1e2e5 ILT |
98 | |
99 | if ((regno == -1) || (regno == LO_REGNUM)) | |
1d275068 PS |
100 | *(regp + CTX_MDLO) = |
101 | extract_address (®isters[REGISTER_BYTE (LO_REGNUM)], | |
102 | REGISTER_RAW_SIZE (LO_REGNUM)); | |
a2f1e2e5 ILT |
103 | } |
104 | ||
105 | /* | |
106 | * Now we do the same thing for floating-point registers. | |
107 | * We don't bother to condition on FP0_REGNUM since any | |
108 | * reasonable MIPS configuration has an R3010 in it. | |
109 | * | |
110 | * Again, see the comments in m68k-tdep.c. | |
111 | */ | |
112 | ||
113 | void | |
114 | supply_fpregset (fpregsetp) | |
115 | fpregset_t *fpregsetp; | |
116 | { | |
117 | register int regi; | |
3f403f6a | 118 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
a2f1e2e5 | 119 | |
1d275068 PS |
120 | /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ |
121 | ||
a2f1e2e5 ILT |
122 | for (regi = 0; regi < 32; regi++) |
123 | supply_register (FP0_REGNUM + regi, | |
124 | (char *)&fpregsetp->fp_r.fp_regs[regi]); | |
125 | ||
126 | supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr); | |
127 | ||
128 | /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */ | |
3f403f6a | 129 | supply_register (FCRIR_REGNUM, zerobuf); |
a2f1e2e5 ILT |
130 | } |
131 | ||
132 | void | |
133 | fill_fpregset (fpregsetp, regno) | |
134 | fpregset_t *fpregsetp; | |
135 | int regno; | |
136 | { | |
137 | int regi; | |
138 | char *from, *to; | |
139 | ||
1d275068 PS |
140 | /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ |
141 | ||
a2f1e2e5 ILT |
142 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) |
143 | { | |
144 | if ((regno == -1) || (regno == regi)) | |
145 | { | |
146 | from = (char *) ®isters[REGISTER_BYTE (regi)]; | |
147 | to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); | |
148 | memcpy(to, from, REGISTER_RAW_SIZE (regi)); | |
149 | } | |
150 | } | |
151 | ||
152 | if ((regno == -1) || (regno == FCRCS_REGNUM)) | |
153 | fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)]; | |
154 | } | |
155 | ||
156 | ||
157 | /* Figure out where the longjmp will land. | |
158 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
159 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
160 | This routine returns true on success. */ | |
161 | ||
162 | int | |
163 | get_longjmp_target (pc) | |
164 | CORE_ADDR *pc; | |
165 | { | |
166 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; | |
167 | CORE_ADDR jb_addr; | |
168 | ||
169 | jb_addr = read_register (A0_REGNUM); | |
170 | ||
171 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
172 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
173 | return 0; | |
174 | ||
175 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
176 | ||
177 | return 1; | |
178 | } | |
179 | ||
a1df8e78 | 180 | static void |
a2f1e2e5 ILT |
181 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
182 | char *core_reg_sect; | |
183 | unsigned core_reg_size; | |
184 | int which; /* Unused */ | |
948a9d92 | 185 | CORE_ADDR reg_addr; /* Unused */ |
a2f1e2e5 | 186 | { |
0db3fe94 PS |
187 | if (core_reg_size == REGISTER_BYTES) |
188 | { | |
189 | memcpy ((char *)registers, core_reg_sect, core_reg_size); | |
190 | } | |
191 | else if (core_reg_size == (2 * REGISTER_BYTES) && MIPS_REGSIZE == 4) | |
192 | { | |
193 | /* This is a core file from a N32 executable, 64 bits are saved | |
194 | for all registers. */ | |
195 | char *srcp = core_reg_sect; | |
196 | char *dstp = registers; | |
197 | int regno; | |
198 | ||
199 | for (regno = 0; regno < NUM_REGS; regno++) | |
200 | { | |
201 | if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32)) | |
202 | { | |
203 | /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB | |
204 | currently assumes that they are 32 bit. */ | |
205 | *dstp++ = *srcp++; | |
206 | *dstp++ = *srcp++; | |
207 | *dstp++ = *srcp++; | |
208 | *dstp++ = *srcp++; | |
209 | srcp += 4; | |
210 | } | |
211 | else | |
212 | { | |
213 | srcp += 4; | |
214 | *dstp++ = *srcp++; | |
215 | *dstp++ = *srcp++; | |
216 | *dstp++ = *srcp++; | |
217 | *dstp++ = *srcp++; | |
218 | } | |
219 | } | |
220 | } | |
221 | else | |
a2f1e2e5 ILT |
222 | { |
223 | warning ("wrong size gregset struct in core file"); | |
224 | return; | |
225 | } | |
226 | ||
0db3fe94 | 227 | registers_fetched (); |
a2f1e2e5 ILT |
228 | } |
229 | \f | |
230 | /* Irix 5 uses what appears to be a unique form of shared library | |
231 | support. This is a copy of solib.c modified for Irix 5. */ | |
0db3fe94 PS |
232 | /* FIXME: Most of this code could be merged with osfsolib.c and solib.c |
233 | by using next_link_map_member and xfer_link_map_member in solib.c. */ | |
a2f1e2e5 ILT |
234 | |
235 | #include <sys/types.h> | |
236 | #include <signal.h> | |
a2f1e2e5 ILT |
237 | #include <sys/param.h> |
238 | #include <fcntl.h> | |
239 | ||
240 | /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts | |
241 | with our versions of those files included by tm-mips.h. Prevent | |
242 | <obj.h> from including them with some appropriate defines. */ | |
243 | #define __SYM_H__ | |
244 | #define __SYMCONST_H__ | |
245 | #include <obj.h> | |
0db3fe94 PS |
246 | #ifdef HAVE_OBJLIST_H |
247 | #include <objlist.h> | |
248 | #endif | |
249 | ||
250 | #ifdef NEW_OBJ_INFO_MAGIC | |
251 | #define HANDLE_NEW_OBJ_LIST | |
252 | #endif | |
a2f1e2e5 ILT |
253 | |
254 | #include "symtab.h" | |
255 | #include "bfd.h" | |
256 | #include "symfile.h" | |
257 | #include "objfiles.h" | |
258 | #include "command.h" | |
259 | #include "frame.h" | |
811f1bdc | 260 | #include "gnu-regex.h" |
a2f1e2e5 ILT |
261 | #include "inferior.h" |
262 | #include "language.h" | |
2e11fdd8 | 263 | #include "gdbcmd.h" |
a2f1e2e5 | 264 | |
a2f1e2e5 ILT |
265 | /* The symbol which starts off the list of shared libraries. */ |
266 | #define DEBUG_BASE "__rld_obj_head" | |
267 | ||
0db3fe94 PS |
268 | /* Irix 6.x introduces a new variant of object lists. |
269 | To be able to debug O32 executables under Irix 6, we have to handle both | |
270 | variants. */ | |
271 | ||
272 | typedef enum | |
273 | { | |
274 | OBJ_LIST_OLD, /* Pre Irix 6.x object list. */ | |
275 | OBJ_LIST_32, /* 32 Bit Elf32_Obj_Info. */ | |
276 | OBJ_LIST_64 /* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */ | |
277 | } obj_list_variant; | |
278 | ||
279 | /* Define our own link_map structure. | |
280 | This will help to share code with osfsolib.c and solib.c. */ | |
281 | ||
282 | struct link_map { | |
283 | obj_list_variant l_variant; /* which variant of object list */ | |
284 | CORE_ADDR l_lladdr; /* addr in inferior list was read from */ | |
285 | CORE_ADDR l_next; /* address of next object list entry */ | |
286 | }; | |
287 | ||
288 | /* Irix 5 shared objects are pre-linked to particular addresses | |
289 | although the dynamic linker may have to relocate them if the | |
290 | address ranges of the libraries used by the main program clash. | |
291 | The offset is the difference between the address where the object | |
292 | is mapped and the binding address of the shared library. */ | |
293 | #define LM_OFFSET(so) ((so) -> offset) | |
294 | /* Loaded address of shared library. */ | |
295 | #define LM_ADDR(so) ((so) -> lmstart) | |
a2f1e2e5 ILT |
296 | |
297 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ | |
298 | ||
a2f1e2e5 ILT |
299 | struct so_list { |
300 | struct so_list *next; /* next structure in linked list */ | |
0db3fe94 PS |
301 | struct link_map lm; |
302 | CORE_ADDR offset; /* prelink to load address offset */ | |
303 | char *so_name; /* shared object lib name */ | |
304 | CORE_ADDR lmstart; /* lower addr bound of mapped object */ | |
a2f1e2e5 ILT |
305 | CORE_ADDR lmend; /* upper addr bound of mapped object */ |
306 | char symbols_loaded; /* flag: symbols read in yet? */ | |
307 | char from_tty; /* flag: print msgs? */ | |
308 | struct objfile *objfile; /* objfile for loaded lib */ | |
309 | struct section_table *sections; | |
310 | struct section_table *sections_end; | |
311 | struct section_table *textsection; | |
312 | bfd *abfd; | |
313 | }; | |
314 | ||
315 | static struct so_list *so_list_head; /* List of known shared objects */ | |
316 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
317 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
318 | ||
319 | /* Local function prototypes */ | |
320 | ||
321 | static void | |
322 | sharedlibrary_command PARAMS ((char *, int)); | |
323 | ||
324 | static int | |
325 | enable_break PARAMS ((void)); | |
326 | ||
327 | static int | |
328 | disable_break PARAMS ((void)); | |
329 | ||
330 | static void | |
331 | info_sharedlibrary_command PARAMS ((char *, int)); | |
332 | ||
333 | static int | |
334 | symbol_add_stub PARAMS ((char *)); | |
335 | ||
336 | static struct so_list * | |
337 | find_solib PARAMS ((struct so_list *)); | |
338 | ||
0db3fe94 | 339 | static struct link_map * |
a2f1e2e5 ILT |
340 | first_link_map_member PARAMS ((void)); |
341 | ||
0db3fe94 PS |
342 | static struct link_map * |
343 | next_link_map_member PARAMS ((struct so_list *)); | |
344 | ||
345 | static void | |
346 | xfer_link_map_member PARAMS ((struct so_list *, struct link_map *)); | |
347 | ||
a2f1e2e5 ILT |
348 | static CORE_ADDR |
349 | locate_base PARAMS ((void)); | |
350 | ||
351 | static void | |
352 | solib_map_sections PARAMS ((struct so_list *)); | |
353 | ||
354 | /* | |
355 | ||
356 | LOCAL FUNCTION | |
357 | ||
358 | solib_map_sections -- open bfd and build sections for shared lib | |
359 | ||
360 | SYNOPSIS | |
361 | ||
362 | static void solib_map_sections (struct so_list *so) | |
363 | ||
364 | DESCRIPTION | |
365 | ||
366 | Given a pointer to one of the shared objects in our list | |
367 | of mapped objects, use the recorded name to open a bfd | |
368 | descriptor for the object, build a section table, and then | |
369 | relocate all the section addresses by the base address at | |
370 | which the shared object was mapped. | |
371 | ||
372 | FIXMES | |
373 | ||
374 | In most (all?) cases the shared object file name recorded in the | |
375 | dynamic linkage tables will be a fully qualified pathname. For | |
376 | cases where it isn't, do we really mimic the systems search | |
377 | mechanism correctly in the below code (particularly the tilde | |
378 | expansion stuff?). | |
379 | */ | |
380 | ||
381 | static void | |
382 | solib_map_sections (so) | |
383 | struct so_list *so; | |
384 | { | |
385 | char *filename; | |
386 | char *scratch_pathname; | |
387 | int scratch_chan; | |
388 | struct section_table *p; | |
389 | struct cleanup *old_chain; | |
390 | bfd *abfd; | |
391 | ||
0db3fe94 | 392 | filename = tilde_expand (so -> so_name); |
a2f1e2e5 ILT |
393 | old_chain = make_cleanup (free, filename); |
394 | ||
395 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
396 | &scratch_pathname); | |
397 | if (scratch_chan < 0) | |
398 | { | |
399 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, | |
400 | O_RDONLY, 0, &scratch_pathname); | |
401 | } | |
402 | if (scratch_chan < 0) | |
403 | { | |
404 | perror_with_name (filename); | |
405 | } | |
406 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ | |
407 | ||
408 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); | |
409 | if (!abfd) | |
410 | { | |
411 | close (scratch_chan); | |
412 | error ("Could not open `%s' as an executable file: %s", | |
c4a081e1 | 413 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
414 | } |
415 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ | |
416 | so -> abfd = abfd; | |
417 | abfd -> cacheable = true; | |
418 | ||
419 | if (!bfd_check_format (abfd, bfd_object)) | |
420 | { | |
421 | error ("\"%s\": not in executable format: %s.", | |
c4a081e1 | 422 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
423 | } |
424 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) | |
425 | { | |
426 | error ("Can't find the file sections in `%s': %s", | |
c4a081e1 | 427 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
428 | } |
429 | ||
430 | for (p = so -> sections; p < so -> sections_end; p++) | |
431 | { | |
432 | /* Relocate the section binding addresses as recorded in the shared | |
33c66e44 PS |
433 | object's file by the offset to get the address to which the |
434 | object was actually mapped. */ | |
0db3fe94 PS |
435 | p -> addr += LM_OFFSET (so); |
436 | p -> endaddr += LM_OFFSET (so); | |
a2f1e2e5 | 437 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); |
94d4b713 | 438 | if (STREQ (p -> the_bfd_section -> name, ".text")) |
a2f1e2e5 ILT |
439 | { |
440 | so -> textsection = p; | |
441 | } | |
442 | } | |
443 | ||
444 | /* Free the file names, close the file now. */ | |
445 | do_cleanups (old_chain); | |
446 | } | |
447 | ||
448 | /* | |
449 | ||
450 | LOCAL FUNCTION | |
451 | ||
452 | locate_base -- locate the base address of dynamic linker structs | |
453 | ||
454 | SYNOPSIS | |
455 | ||
456 | CORE_ADDR locate_base (void) | |
457 | ||
458 | DESCRIPTION | |
459 | ||
460 | For both the SunOS and SVR4 shared library implementations, if the | |
461 | inferior executable has been linked dynamically, there is a single | |
462 | address somewhere in the inferior's data space which is the key to | |
463 | locating all of the dynamic linker's runtime structures. This | |
464 | address is the value of the symbol defined by the macro DEBUG_BASE. | |
465 | The job of this function is to find and return that address, or to | |
466 | return 0 if there is no such address (the executable is statically | |
467 | linked for example). | |
468 | ||
469 | For SunOS, the job is almost trivial, since the dynamic linker and | |
470 | all of it's structures are statically linked to the executable at | |
471 | link time. Thus the symbol for the address we are looking for has | |
472 | already been added to the minimal symbol table for the executable's | |
473 | objfile at the time the symbol file's symbols were read, and all we | |
474 | have to do is look it up there. Note that we explicitly do NOT want | |
475 | to find the copies in the shared library. | |
476 | ||
477 | The SVR4 version is much more complicated because the dynamic linker | |
478 | and it's structures are located in the shared C library, which gets | |
479 | run as the executable's "interpreter" by the kernel. We have to go | |
480 | to a lot more work to discover the address of DEBUG_BASE. Because | |
481 | of this complexity, we cache the value we find and return that value | |
482 | on subsequent invocations. Note there is no copy in the executable | |
483 | symbol tables. | |
484 | ||
485 | Irix 5 is basically like SunOS. | |
486 | ||
487 | Note that we can assume nothing about the process state at the time | |
488 | we need to find this address. We may be stopped on the first instruc- | |
489 | tion of the interpreter (C shared library), the first instruction of | |
490 | the executable itself, or somewhere else entirely (if we attached | |
491 | to the process for example). | |
492 | ||
493 | */ | |
494 | ||
495 | static CORE_ADDR | |
496 | locate_base () | |
497 | { | |
498 | struct minimal_symbol *msymbol; | |
499 | CORE_ADDR address = 0; | |
500 | ||
2d336b1b | 501 | msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile); |
a2f1e2e5 ILT |
502 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
503 | { | |
504 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
505 | } | |
506 | return (address); | |
507 | } | |
508 | ||
509 | /* | |
510 | ||
511 | LOCAL FUNCTION | |
512 | ||
513 | first_link_map_member -- locate first member in dynamic linker's map | |
514 | ||
515 | SYNOPSIS | |
516 | ||
517 | static struct link_map *first_link_map_member (void) | |
518 | ||
519 | DESCRIPTION | |
520 | ||
521 | Read in a copy of the first member in the inferior's dynamic | |
522 | link map from the inferior's dynamic linker structures, and return | |
0db3fe94 | 523 | a pointer to the link map descriptor. |
a2f1e2e5 ILT |
524 | */ |
525 | ||
0db3fe94 | 526 | static struct link_map * |
a2f1e2e5 ILT |
527 | first_link_map_member () |
528 | { | |
0db3fe94 PS |
529 | struct obj_list *listp; |
530 | struct obj_list list_old; | |
531 | struct link_map *lm; | |
532 | static struct link_map first_lm; | |
533 | CORE_ADDR lladdr; | |
534 | CORE_ADDR next_lladdr; | |
535 | ||
536 | /* We have not already read in the dynamic linking structures | |
537 | from the inferior, lookup the address of the base structure. */ | |
538 | debug_base = locate_base (); | |
539 | if (debug_base == 0) | |
540 | return NULL; | |
a2f1e2e5 | 541 | |
0db3fe94 PS |
542 | /* Get address of first list entry. */ |
543 | read_memory (debug_base, (char *) &listp, sizeof (struct obj_list *)); | |
a2f1e2e5 | 544 | |
0db3fe94 | 545 | if (listp == NULL) |
a2f1e2e5 ILT |
546 | return NULL; |
547 | ||
0db3fe94 PS |
548 | /* Get first list entry. */ |
549 | lladdr = (CORE_ADDR) listp; | |
550 | read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); | |
551 | ||
a2f1e2e5 ILT |
552 | /* The first entry in the list is the object file we are debugging, |
553 | so skip it. */ | |
0db3fe94 PS |
554 | next_lladdr = (CORE_ADDR) list_old.next; |
555 | ||
556 | #ifdef HANDLE_NEW_OBJ_LIST | |
557 | if (list_old.data == NEW_OBJ_INFO_MAGIC) | |
558 | { | |
559 | Elf32_Obj_Info list_32; | |
560 | ||
561 | read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); | |
562 | if (list_32.oi_size != sizeof (Elf32_Obj_Info)) | |
563 | return NULL; | |
564 | next_lladdr = (CORE_ADDR) list_32.oi_next; | |
565 | } | |
566 | #endif | |
567 | ||
568 | if (next_lladdr == 0) | |
569 | return NULL; | |
570 | ||
571 | first_lm.l_lladdr = next_lladdr; | |
572 | lm = &first_lm; | |
573 | return lm; | |
574 | } | |
575 | ||
576 | /* | |
577 | ||
578 | LOCAL FUNCTION | |
579 | ||
580 | next_link_map_member -- locate next member in dynamic linker's map | |
581 | ||
582 | SYNOPSIS | |
583 | ||
584 | static struct link_map *next_link_map_member (so_list_ptr) | |
585 | ||
586 | DESCRIPTION | |
587 | ||
588 | Read in a copy of the next member in the inferior's dynamic | |
589 | link map from the inferior's dynamic linker structures, and return | |
590 | a pointer to the link map descriptor. | |
591 | */ | |
592 | ||
593 | static struct link_map * | |
594 | next_link_map_member (so_list_ptr) | |
595 | struct so_list *so_list_ptr; | |
596 | { | |
597 | struct link_map *lm = &so_list_ptr -> lm; | |
598 | CORE_ADDR next_lladdr = lm -> l_next; | |
599 | static struct link_map next_lm; | |
600 | ||
601 | if (next_lladdr == 0) | |
602 | { | |
603 | /* We have hit the end of the list, so check to see if any were | |
604 | added, but be quiet if we can't read from the target any more. */ | |
605 | int status = 0; | |
606 | ||
607 | if (lm -> l_variant == OBJ_LIST_OLD) | |
608 | { | |
609 | struct obj_list list_old; | |
610 | ||
611 | status = target_read_memory (lm -> l_lladdr, | |
612 | (char *) &list_old, | |
613 | sizeof (struct obj_list)); | |
614 | next_lladdr = (CORE_ADDR) list_old.next; | |
615 | } | |
616 | #ifdef HANDLE_NEW_OBJ_LIST | |
617 | else if (lm -> l_variant == OBJ_LIST_32) | |
618 | { | |
619 | Elf32_Obj_Info list_32; | |
620 | status = target_read_memory (lm -> l_lladdr, | |
621 | (char *) &list_32, | |
622 | sizeof (Elf32_Obj_Info)); | |
623 | next_lladdr = (CORE_ADDR) list_32.oi_next; | |
624 | } | |
625 | #endif | |
626 | ||
627 | if (status != 0 || next_lladdr == 0) | |
628 | return NULL; | |
629 | } | |
a2f1e2e5 | 630 | |
0db3fe94 PS |
631 | next_lm.l_lladdr = next_lladdr; |
632 | lm = &next_lm; | |
633 | return lm; | |
a2f1e2e5 ILT |
634 | } |
635 | ||
0db3fe94 PS |
636 | /* |
637 | ||
638 | LOCAL FUNCTION | |
639 | ||
640 | xfer_link_map_member -- set local variables from dynamic linker's map | |
641 | ||
642 | SYNOPSIS | |
643 | ||
644 | static void xfer_link_map_member (so_list_ptr, lm) | |
645 | ||
646 | DESCRIPTION | |
647 | ||
648 | Read in a copy of the requested member in the inferior's dynamic | |
649 | link map from the inferior's dynamic linker structures, and fill | |
650 | in the necessary so_list_ptr elements. | |
651 | */ | |
652 | ||
653 | static void | |
654 | xfer_link_map_member (so_list_ptr, lm) | |
655 | struct so_list *so_list_ptr; | |
656 | struct link_map *lm; | |
657 | { | |
658 | struct obj_list list_old; | |
659 | CORE_ADDR lladdr = lm -> l_lladdr; | |
660 | struct link_map *new_lm = &so_list_ptr -> lm; | |
661 | int errcode; | |
662 | ||
663 | read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list)); | |
664 | ||
665 | new_lm -> l_variant = OBJ_LIST_OLD; | |
666 | new_lm -> l_lladdr = lladdr; | |
667 | new_lm -> l_next = (CORE_ADDR) list_old.next; | |
668 | ||
669 | #ifdef HANDLE_NEW_OBJ_LIST | |
670 | if (list_old.data == NEW_OBJ_INFO_MAGIC) | |
671 | { | |
672 | Elf32_Obj_Info list_32; | |
673 | ||
674 | read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info)); | |
675 | if (list_32.oi_size != sizeof (Elf32_Obj_Info)) | |
676 | return; | |
677 | new_lm -> l_variant = OBJ_LIST_32; | |
678 | new_lm -> l_next = (CORE_ADDR) list_32.oi_next; | |
679 | ||
680 | target_read_string ((CORE_ADDR) list_32.oi_pathname, | |
681 | &so_list_ptr -> so_name, | |
682 | list_32.oi_pathname_len + 1, &errcode); | |
683 | if (errcode != 0) | |
684 | memory_error (errcode, (CORE_ADDR) list_32.oi_pathname); | |
685 | ||
686 | LM_ADDR (so_list_ptr) = (CORE_ADDR) list_32.oi_ehdr; | |
1d275068 PS |
687 | LM_OFFSET (so_list_ptr) = |
688 | (CORE_ADDR) list_32.oi_ehdr - (CORE_ADDR) list_32.oi_orig_ehdr; | |
0db3fe94 PS |
689 | } |
690 | else | |
691 | #endif | |
692 | { | |
1d275068 PS |
693 | #if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32 |
694 | /* If we are compiling GDB under N32 ABI, the alignments in | |
695 | the obj struct are different from the O32 ABI and we will get | |
696 | wrong values when accessing the struct. | |
697 | As a workaround we use fixed values which are good for | |
698 | Irix 6.2. */ | |
699 | char buf[432]; | |
700 | ||
701 | read_memory ((CORE_ADDR) list_old.data, buf, sizeof (buf)); | |
702 | ||
703 | target_read_string (extract_address (&buf[236], 4), | |
704 | &so_list_ptr -> so_name, | |
705 | INT_MAX, &errcode); | |
706 | if (errcode != 0) | |
707 | memory_error (errcode, extract_address (&buf[236], 4)); | |
708 | ||
709 | LM_ADDR (so_list_ptr) = extract_address (&buf[196], 4); | |
710 | LM_OFFSET (so_list_ptr) = | |
711 | extract_address (&buf[196], 4) - extract_address (&buf[248], 4); | |
712 | #else | |
0db3fe94 PS |
713 | struct obj obj_old; |
714 | ||
715 | read_memory ((CORE_ADDR) list_old.data, (char *) &obj_old, | |
716 | sizeof (struct obj)); | |
717 | ||
718 | target_read_string ((CORE_ADDR) obj_old.o_path, | |
719 | &so_list_ptr -> so_name, | |
720 | INT_MAX, &errcode); | |
721 | if (errcode != 0) | |
722 | memory_error (errcode, (CORE_ADDR) obj_old.o_path); | |
723 | ||
724 | LM_ADDR (so_list_ptr) = (CORE_ADDR) obj_old.o_praw; | |
1d275068 PS |
725 | LM_OFFSET (so_list_ptr) = |
726 | (CORE_ADDR) obj_old.o_praw - obj_old.o_base_address; | |
727 | #endif | |
0db3fe94 PS |
728 | } |
729 | ||
730 | solib_map_sections (so_list_ptr); | |
731 | } | |
732 | ||
733 | ||
a2f1e2e5 ILT |
734 | /* |
735 | ||
736 | LOCAL FUNCTION | |
737 | ||
738 | find_solib -- step through list of shared objects | |
739 | ||
740 | SYNOPSIS | |
741 | ||
742 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
743 | ||
744 | DESCRIPTION | |
745 | ||
746 | This module contains the routine which finds the names of any | |
747 | loaded "images" in the current process. The argument in must be | |
748 | NULL on the first call, and then the returned value must be passed | |
749 | in on subsequent calls. This provides the capability to "step" down | |
750 | the list of loaded objects. On the last object, a NULL value is | |
751 | returned. | |
752 | */ | |
753 | ||
754 | static struct so_list * | |
755 | find_solib (so_list_ptr) | |
756 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
757 | { | |
758 | struct so_list *so_list_next = NULL; | |
0db3fe94 | 759 | struct link_map *lm = NULL; |
a2f1e2e5 ILT |
760 | struct so_list *new; |
761 | ||
762 | if (so_list_ptr == NULL) | |
763 | { | |
764 | /* We are setting up for a new scan through the loaded images. */ | |
765 | if ((so_list_next = so_list_head) == NULL) | |
766 | { | |
0db3fe94 PS |
767 | /* Find the first link map list member. */ |
768 | lm = first_link_map_member (); | |
a2f1e2e5 ILT |
769 | } |
770 | } | |
771 | else | |
772 | { | |
773 | /* We have been called before, and are in the process of walking | |
774 | the shared library list. Advance to the next shared object. */ | |
0db3fe94 | 775 | lm = next_link_map_member (so_list_ptr); |
a2f1e2e5 ILT |
776 | so_list_next = so_list_ptr -> next; |
777 | } | |
778 | if ((so_list_next == NULL) && (lm != NULL)) | |
779 | { | |
a2f1e2e5 ILT |
780 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); |
781 | memset ((char *) new, 0, sizeof (struct so_list)); | |
a2f1e2e5 ILT |
782 | /* Add the new node as the next node in the list, or as the root |
783 | node if this is the first one. */ | |
784 | if (so_list_ptr != NULL) | |
785 | { | |
786 | so_list_ptr -> next = new; | |
787 | } | |
788 | else | |
789 | { | |
790 | so_list_head = new; | |
791 | } | |
792 | so_list_next = new; | |
0db3fe94 | 793 | xfer_link_map_member (new, lm); |
a2f1e2e5 ILT |
794 | } |
795 | return (so_list_next); | |
796 | } | |
797 | ||
798 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ | |
799 | ||
800 | static int | |
801 | symbol_add_stub (arg) | |
802 | char *arg; | |
803 | { | |
804 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ | |
73b8e6a9 PS |
805 | CORE_ADDR text_addr = 0; |
806 | ||
807 | if (so -> textsection) | |
808 | text_addr = so -> textsection -> addr; | |
809 | else | |
810 | { | |
811 | asection *lowest_sect; | |
812 | ||
813 | /* If we didn't find a mapped non zero sized .text section, set up | |
814 | text_addr so that the relocation in symbol_file_add does no harm. */ | |
815 | ||
816 | lowest_sect = bfd_get_section_by_name (so -> abfd, ".text"); | |
817 | if (lowest_sect == NULL) | |
818 | bfd_map_over_sections (so -> abfd, find_lowest_section, | |
819 | (PTR) &lowest_sect); | |
820 | if (lowest_sect) | |
0db3fe94 | 821 | text_addr = bfd_section_vma (so -> abfd, lowest_sect) + LM_OFFSET (so); |
73b8e6a9 | 822 | } |
a2f1e2e5 | 823 | |
0db3fe94 | 824 | so -> objfile = symbol_file_add (so -> so_name, so -> from_tty, |
73b8e6a9 | 825 | text_addr, |
a2f1e2e5 ILT |
826 | 0, 0, 0); |
827 | return (1); | |
828 | } | |
829 | ||
830 | /* | |
831 | ||
832 | GLOBAL FUNCTION | |
833 | ||
834 | solib_add -- add a shared library file to the symtab and section list | |
835 | ||
836 | SYNOPSIS | |
837 | ||
838 | void solib_add (char *arg_string, int from_tty, | |
839 | struct target_ops *target) | |
840 | ||
841 | DESCRIPTION | |
842 | ||
843 | */ | |
844 | ||
845 | void | |
846 | solib_add (arg_string, from_tty, target) | |
847 | char *arg_string; | |
848 | int from_tty; | |
849 | struct target_ops *target; | |
850 | { | |
851 | register struct so_list *so = NULL; /* link map state variable */ | |
852 | ||
853 | /* Last shared library that we read. */ | |
854 | struct so_list *so_last = NULL; | |
855 | ||
856 | char *re_err; | |
857 | int count; | |
858 | int old; | |
859 | ||
860 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
861 | { | |
862 | error ("Invalid regexp: %s", re_err); | |
863 | } | |
864 | ||
0d98155c | 865 | /* Add the shared library sections to the section table of the |
46d185d3 | 866 | specified target, if any. */ |
a2f1e2e5 ILT |
867 | if (target) |
868 | { | |
869 | /* Count how many new section_table entries there are. */ | |
870 | so = NULL; | |
871 | count = 0; | |
872 | while ((so = find_solib (so)) != NULL) | |
873 | { | |
0db3fe94 | 874 | if (so -> so_name[0]) |
a2f1e2e5 ILT |
875 | { |
876 | count += so -> sections_end - so -> sections; | |
877 | } | |
878 | } | |
879 | ||
880 | if (count) | |
881 | { | |
148070cc JL |
882 | int update_coreops; |
883 | ||
884 | /* We must update the to_sections field in the core_ops structure | |
885 | here, otherwise we dereference a potential dangling pointer | |
886 | for each call to target_read/write_memory within this routine. */ | |
887 | update_coreops = core_ops.to_sections == target->to_sections; | |
888 | ||
a2f1e2e5 ILT |
889 | /* Reallocate the target's section table including the new size. */ |
890 | if (target -> to_sections) | |
891 | { | |
892 | old = target -> to_sections_end - target -> to_sections; | |
893 | target -> to_sections = (struct section_table *) | |
894 | xrealloc ((char *)target -> to_sections, | |
895 | (sizeof (struct section_table)) * (count + old)); | |
896 | } | |
897 | else | |
898 | { | |
899 | old = 0; | |
900 | target -> to_sections = (struct section_table *) | |
901 | xmalloc ((sizeof (struct section_table)) * count); | |
902 | } | |
903 | target -> to_sections_end = target -> to_sections + (count + old); | |
904 | ||
148070cc JL |
905 | /* Update the to_sections field in the core_ops structure |
906 | if needed. */ | |
907 | if (update_coreops) | |
908 | { | |
909 | core_ops.to_sections = target->to_sections; | |
910 | core_ops.to_sections_end = target->to_sections_end; | |
911 | } | |
912 | ||
a2f1e2e5 ILT |
913 | /* Add these section table entries to the target's table. */ |
914 | while ((so = find_solib (so)) != NULL) | |
915 | { | |
0db3fe94 | 916 | if (so -> so_name[0]) |
a2f1e2e5 ILT |
917 | { |
918 | count = so -> sections_end - so -> sections; | |
919 | memcpy ((char *) (target -> to_sections + old), | |
920 | so -> sections, | |
921 | (sizeof (struct section_table)) * count); | |
922 | old += count; | |
923 | } | |
924 | } | |
925 | } | |
926 | } | |
0d98155c PS |
927 | |
928 | /* Now add the symbol files. */ | |
929 | while ((so = find_solib (so)) != NULL) | |
930 | { | |
0db3fe94 | 931 | if (so -> so_name[0] && re_exec (so -> so_name)) |
0d98155c PS |
932 | { |
933 | so -> from_tty = from_tty; | |
934 | if (so -> symbols_loaded) | |
935 | { | |
936 | if (from_tty) | |
937 | { | |
0db3fe94 | 938 | printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); |
0d98155c PS |
939 | } |
940 | } | |
941 | else if (catch_errors | |
942 | (symbol_add_stub, (char *) so, | |
943 | "Error while reading shared library symbols:\n", | |
944 | RETURN_MASK_ALL)) | |
945 | { | |
946 | so_last = so; | |
947 | so -> symbols_loaded = 1; | |
948 | } | |
949 | } | |
950 | } | |
46d185d3 PS |
951 | |
952 | /* Getting new symbols may change our opinion about what is | |
953 | frameless. */ | |
54d478cd | 954 | if (so_last) |
46d185d3 | 955 | reinit_frame_cache (); |
a2f1e2e5 ILT |
956 | } |
957 | ||
958 | /* | |
959 | ||
960 | LOCAL FUNCTION | |
961 | ||
962 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
963 | ||
964 | SYNOPSIS | |
965 | ||
966 | static void info_sharedlibrary_command () | |
967 | ||
968 | DESCRIPTION | |
969 | ||
970 | Walk through the shared library list and print information | |
971 | about each attached library. | |
972 | */ | |
973 | ||
974 | static void | |
975 | info_sharedlibrary_command (ignore, from_tty) | |
976 | char *ignore; | |
977 | int from_tty; | |
978 | { | |
979 | register struct so_list *so = NULL; /* link map state variable */ | |
980 | int header_done = 0; | |
981 | ||
982 | if (exec_bfd == NULL) | |
983 | { | |
984 | printf_unfiltered ("No exec file.\n"); | |
985 | return; | |
986 | } | |
987 | while ((so = find_solib (so)) != NULL) | |
988 | { | |
0db3fe94 | 989 | if (so -> so_name[0]) |
a2f1e2e5 ILT |
990 | { |
991 | if (!header_done) | |
992 | { | |
993 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", | |
994 | "Shared Object Library"); | |
995 | header_done++; | |
996 | } | |
997 | printf_unfiltered ("%-12s", | |
998 | local_hex_string_custom ((unsigned long) LM_ADDR (so), | |
999 | "08l")); | |
1000 | printf_unfiltered ("%-12s", | |
1001 | local_hex_string_custom ((unsigned long) so -> lmend, | |
1002 | "08l")); | |
1003 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); | |
0db3fe94 | 1004 | printf_unfiltered ("%s\n", so -> so_name); |
a2f1e2e5 ILT |
1005 | } |
1006 | } | |
1007 | if (so_list_head == NULL) | |
1008 | { | |
1009 | printf_unfiltered ("No shared libraries loaded at this time.\n"); | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | ||
1015 | GLOBAL FUNCTION | |
1016 | ||
1017 | solib_address -- check to see if an address is in a shared lib | |
1018 | ||
1019 | SYNOPSIS | |
1020 | ||
f2ebb24d | 1021 | char *solib_address (CORE_ADDR address) |
a2f1e2e5 ILT |
1022 | |
1023 | DESCRIPTION | |
1024 | ||
1025 | Provides a hook for other gdb routines to discover whether or | |
1026 | not a particular address is within the mapped address space of | |
1027 | a shared library. Any address between the base mapping address | |
1028 | and the first address beyond the end of the last mapping, is | |
1029 | considered to be within the shared library address space, for | |
1030 | our purposes. | |
1031 | ||
1032 | For example, this routine is called at one point to disable | |
1033 | breakpoints which are in shared libraries that are not currently | |
1034 | mapped in. | |
1035 | */ | |
1036 | ||
f2ebb24d | 1037 | char * |
a2f1e2e5 ILT |
1038 | solib_address (address) |
1039 | CORE_ADDR address; | |
1040 | { | |
1041 | register struct so_list *so = 0; /* link map state variable */ | |
1042 | ||
1043 | while ((so = find_solib (so)) != NULL) | |
1044 | { | |
0db3fe94 | 1045 | if (so -> so_name[0]) |
a2f1e2e5 | 1046 | { |
33c66e44 | 1047 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && |
a2f1e2e5 | 1048 | (address < (CORE_ADDR) so -> lmend)) |
0db3fe94 | 1049 | return (so->so_name); |
a2f1e2e5 ILT |
1050 | } |
1051 | } | |
1052 | return (0); | |
1053 | } | |
1054 | ||
1055 | /* Called by free_all_symtabs */ | |
1056 | ||
1057 | void | |
1058 | clear_solib() | |
1059 | { | |
1060 | struct so_list *next; | |
1061 | char *bfd_filename; | |
1062 | ||
1063 | while (so_list_head) | |
1064 | { | |
1065 | if (so_list_head -> sections) | |
1066 | { | |
1067 | free ((PTR)so_list_head -> sections); | |
1068 | } | |
1069 | if (so_list_head -> abfd) | |
1070 | { | |
1071 | bfd_filename = bfd_get_filename (so_list_head -> abfd); | |
9de0904c JK |
1072 | if (!bfd_close (so_list_head -> abfd)) |
1073 | warning ("cannot close \"%s\": %s", | |
1074 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
a2f1e2e5 ILT |
1075 | } |
1076 | else | |
1077 | /* This happens for the executable on SVR4. */ | |
1078 | bfd_filename = NULL; | |
4ad0021e | 1079 | |
a2f1e2e5 ILT |
1080 | next = so_list_head -> next; |
1081 | if (bfd_filename) | |
1082 | free ((PTR)bfd_filename); | |
0db3fe94 | 1083 | free (so_list_head->so_name); |
a2f1e2e5 ILT |
1084 | free ((PTR)so_list_head); |
1085 | so_list_head = next; | |
1086 | } | |
1087 | debug_base = 0; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | ||
1092 | LOCAL FUNCTION | |
1093 | ||
1094 | disable_break -- remove the "mapping changed" breakpoint | |
1095 | ||
1096 | SYNOPSIS | |
1097 | ||
1098 | static int disable_break () | |
1099 | ||
1100 | DESCRIPTION | |
1101 | ||
1102 | Removes the breakpoint that gets hit when the dynamic linker | |
1103 | completes a mapping change. | |
1104 | ||
1105 | */ | |
1106 | ||
1107 | static int | |
1108 | disable_break () | |
1109 | { | |
1110 | int status = 1; | |
1111 | ||
1112 | ||
1113 | /* Note that breakpoint address and original contents are in our address | |
1114 | space, so we just need to write the original contents back. */ | |
1115 | ||
1116 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1117 | { | |
1118 | status = 0; | |
1119 | } | |
1120 | ||
1121 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1122 | SunOS version we don't know it until the above code is executed. | |
1123 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1124 | ||
1125 | if (stop_pc != breakpoint_addr) | |
1126 | { | |
1127 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1128 | } | |
1129 | ||
1130 | return (status); | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | ||
1135 | LOCAL FUNCTION | |
1136 | ||
1137 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1138 | ||
1139 | SYNOPSIS | |
1140 | ||
1141 | int enable_break (void) | |
1142 | ||
1143 | DESCRIPTION | |
1144 | ||
76212295 PS |
1145 | This functions inserts a breakpoint at the entry point of the |
1146 | main executable, where all shared libraries are mapped in. | |
a2f1e2e5 ILT |
1147 | */ |
1148 | ||
1149 | static int | |
1150 | enable_break () | |
1151 | { | |
76212295 PS |
1152 | if (symfile_objfile != NULL |
1153 | && target_insert_breakpoint (symfile_objfile->ei.entry_point, | |
1154 | shadow_contents) == 0) | |
a2f1e2e5 | 1155 | { |
76212295 PS |
1156 | breakpoint_addr = symfile_objfile->ei.entry_point; |
1157 | return 1; | |
a2f1e2e5 ILT |
1158 | } |
1159 | ||
76212295 | 1160 | return 0; |
a2f1e2e5 ILT |
1161 | } |
1162 | ||
1163 | /* | |
1164 | ||
1165 | GLOBAL FUNCTION | |
1166 | ||
1167 | solib_create_inferior_hook -- shared library startup support | |
1168 | ||
1169 | SYNOPSIS | |
1170 | ||
1171 | void solib_create_inferior_hook() | |
1172 | ||
1173 | DESCRIPTION | |
1174 | ||
1175 | When gdb starts up the inferior, it nurses it along (through the | |
1176 | shell) until it is ready to execute it's first instruction. At this | |
1177 | point, this function gets called via expansion of the macro | |
1178 | SOLIB_CREATE_INFERIOR_HOOK. | |
1179 | ||
1180 | For SunOS executables, this first instruction is typically the | |
1181 | one at "_start", or a similar text label, regardless of whether | |
1182 | the executable is statically or dynamically linked. The runtime | |
1183 | startup code takes care of dynamically linking in any shared | |
1184 | libraries, once gdb allows the inferior to continue. | |
1185 | ||
1186 | For SVR4 executables, this first instruction is either the first | |
1187 | instruction in the dynamic linker (for dynamically linked | |
1188 | executables) or the instruction at "start" for statically linked | |
1189 | executables. For dynamically linked executables, the system | |
1190 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1191 | and starts it running. The dynamic linker maps in any needed | |
1192 | shared libraries, maps in the actual user executable, and then | |
1193 | jumps to "start" in the user executable. | |
1194 | ||
1195 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1196 | can arrange to cooperate with the dynamic linker to discover the | |
1197 | names of shared libraries that are dynamically linked, and the | |
1198 | base addresses to which they are linked. | |
1199 | ||
1200 | This function is responsible for discovering those names and | |
1201 | addresses, and saving sufficient information about them to allow | |
1202 | their symbols to be read at a later time. | |
1203 | ||
1204 | FIXME | |
1205 | ||
1206 | Between enable_break() and disable_break(), this code does not | |
1207 | properly handle hitting breakpoints which the user might have | |
1208 | set in the startup code or in the dynamic linker itself. Proper | |
1209 | handling will probably have to wait until the implementation is | |
1210 | changed to use the "breakpoint handler function" method. | |
1211 | ||
1212 | Also, what if child has exit()ed? Must exit loop somehow. | |
1213 | */ | |
1214 | ||
1215 | void | |
1216 | solib_create_inferior_hook() | |
1217 | { | |
1218 | if (!enable_break ()) | |
1219 | { | |
1220 | warning ("shared library handler failed to enable breakpoint"); | |
1221 | return; | |
1222 | } | |
1223 | ||
1224 | /* Now run the target. It will eventually hit the breakpoint, at | |
1225 | which point all of the libraries will have been mapped in and we | |
1226 | can go groveling around in the dynamic linker structures to find | |
1227 | out what we need to know about them. */ | |
1228 | ||
1229 | clear_proceed_status (); | |
1230 | stop_soon_quietly = 1; | |
0db3fe94 | 1231 | stop_signal = TARGET_SIGNAL_0; |
a2f1e2e5 ILT |
1232 | do |
1233 | { | |
1234 | target_resume (-1, 0, stop_signal); | |
1235 | wait_for_inferior (); | |
1236 | } | |
0db3fe94 | 1237 | while (stop_signal != TARGET_SIGNAL_TRAP); |
a2f1e2e5 ILT |
1238 | |
1239 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1240 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1241 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1242 | add any shared libraries that were mapped in. */ | |
1243 | ||
1244 | if (DECR_PC_AFTER_BREAK) | |
1245 | { | |
1246 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1247 | write_register (PC_REGNUM, stop_pc); | |
1248 | } | |
1249 | ||
1250 | if (!disable_break ()) | |
1251 | { | |
1252 | warning ("shared library handler failed to disable breakpoint"); | |
1253 | } | |
1254 | ||
76212295 PS |
1255 | /* solib_add will call reinit_frame_cache. |
1256 | But we are stopped in the startup code and we might not have symbols | |
1257 | for the startup code, so heuristic_proc_start could be called | |
1258 | and will put out an annoying warning. | |
1259 | Delaying the resetting of stop_soon_quietly until after symbol loading | |
1260 | suppresses the warning. */ | |
87273c71 | 1261 | if (auto_solib_add) |
2e11fdd8 | 1262 | solib_add ((char *) 0, 0, (struct target_ops *) 0); |
76212295 | 1263 | stop_soon_quietly = 0; |
a2f1e2e5 ILT |
1264 | } |
1265 | ||
1266 | /* | |
1267 | ||
1268 | LOCAL FUNCTION | |
1269 | ||
1270 | sharedlibrary_command -- handle command to explicitly add library | |
1271 | ||
1272 | SYNOPSIS | |
1273 | ||
1274 | static void sharedlibrary_command (char *args, int from_tty) | |
1275 | ||
1276 | DESCRIPTION | |
1277 | ||
1278 | */ | |
1279 | ||
1280 | static void | |
1281 | sharedlibrary_command (args, from_tty) | |
1282 | char *args; | |
1283 | int from_tty; | |
1284 | { | |
1285 | dont_repeat (); | |
1286 | solib_add (args, from_tty, (struct target_ops *) 0); | |
1287 | } | |
1288 | ||
1289 | void | |
1290 | _initialize_solib() | |
1291 | { | |
a2f1e2e5 ILT |
1292 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
1293 | "Load shared object library symbols for files matching REGEXP."); | |
1294 | add_info ("sharedlibrary", info_sharedlibrary_command, | |
1295 | "Status of loaded shared object libraries."); | |
2e11fdd8 PS |
1296 | |
1297 | add_show_from_set | |
1298 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
87273c71 JL |
1299 | (char *) &auto_solib_add, |
1300 | "Set autoloading of shared library symbols.\n\ | |
2e11fdd8 | 1301 | If nonzero, symbols from all shared object libraries will be loaded\n\ |
87273c71 JL |
1302 | automatically when the inferior begins execution or when the dynamic linker\n\ |
1303 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
2e11fdd8 PS |
1304 | must be loaded manually, using `sharedlibrary'.", |
1305 | &setlist), | |
1306 | &showlist); | |
a2f1e2e5 | 1307 | } |
a1df8e78 FF |
1308 | |
1309 | \f | |
1310 | /* Register that we are able to handle irix5 core file formats. | |
1311 | This really is bfd_target_unknown_flavour */ | |
1312 | ||
1313 | static struct core_fns irix5_core_fns = | |
1314 | { | |
1315 | bfd_target_unknown_flavour, | |
1316 | fetch_core_registers, | |
1317 | NULL | |
1318 | }; | |
1319 | ||
1320 | void | |
1321 | _initialize_core_irix5 () | |
1322 | { | |
1323 | add_core_fns (&irix5_core_fns); | |
1324 | } |