Commit | Line | Data |
---|---|---|
a2f1e2e5 | 1 | /* Native support for the SGI Iris running IRIX version 5, for GDB. |
33c66e44 PS |
2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994 |
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 | |
23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
24 | ||
25 | #include "defs.h" | |
26 | #include "inferior.h" | |
27 | #include "gdbcore.h" | |
28 | #include "target.h" | |
29 | ||
30 | #include <sys/time.h> | |
31 | #include <sys/procfs.h> | |
32 | #include <setjmp.h> /* For JB_XXX. */ | |
33 | ||
34 | /* Size of elements in jmpbuf */ | |
35 | ||
36 | #define JB_ELEMENT_SIZE 4 | |
37 | ||
38 | /* | |
39 | * See the comment in m68k-tdep.c regarding the utility of these functions. | |
40 | * | |
41 | * These definitions are from the MIPS SVR4 ABI, so they may work for | |
42 | * any MIPS SVR4 target. | |
43 | */ | |
44 | ||
45 | void | |
46 | supply_gregset (gregsetp) | |
47 | gregset_t *gregsetp; | |
48 | { | |
49 | register int regi; | |
50 | register greg_t *regp = &(*gregsetp)[0]; | |
51 | ||
52 | for(regi = 0; regi <= CTX_RA; regi++) | |
53 | supply_register (regi, (char *)(regp + regi)); | |
54 | ||
55 | supply_register (PC_REGNUM, (char *)(regp + CTX_EPC)); | |
56 | supply_register (HI_REGNUM, (char *)(regp + CTX_MDHI)); | |
57 | supply_register (LO_REGNUM, (char *)(regp + CTX_MDLO)); | |
58 | supply_register (CAUSE_REGNUM, (char *)(regp + CTX_CAUSE)); | |
59 | } | |
60 | ||
61 | void | |
62 | fill_gregset (gregsetp, regno) | |
63 | gregset_t *gregsetp; | |
64 | int regno; | |
65 | { | |
66 | int regi; | |
67 | register greg_t *regp = &(*gregsetp)[0]; | |
68 | ||
69 | for (regi = 0; regi <= CTX_RA; regi++) | |
70 | if ((regno == -1) || (regno == regi)) | |
71 | *(regp + regi) = *(greg_t *) ®isters[REGISTER_BYTE (regi)]; | |
72 | ||
73 | if ((regno == -1) || (regno == PC_REGNUM)) | |
74 | *(regp + CTX_EPC) = *(greg_t *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
75 | ||
76 | if ((regno == -1) || (regno == CAUSE_REGNUM)) | |
77 | *(regp + CTX_CAUSE) = *(greg_t *) ®isters[REGISTER_BYTE (PS_REGNUM)]; | |
78 | ||
79 | if ((regno == -1) || (regno == HI_REGNUM)) | |
80 | *(regp + CTX_MDHI) = *(greg_t *) ®isters[REGISTER_BYTE (HI_REGNUM)]; | |
81 | ||
82 | if ((regno == -1) || (regno == LO_REGNUM)) | |
83 | *(regp + CTX_MDLO) = *(greg_t *) ®isters[REGISTER_BYTE (LO_REGNUM)]; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Now we do the same thing for floating-point registers. | |
88 | * We don't bother to condition on FP0_REGNUM since any | |
89 | * reasonable MIPS configuration has an R3010 in it. | |
90 | * | |
91 | * Again, see the comments in m68k-tdep.c. | |
92 | */ | |
93 | ||
94 | void | |
95 | supply_fpregset (fpregsetp) | |
96 | fpregset_t *fpregsetp; | |
97 | { | |
98 | register int regi; | |
99 | ||
100 | for (regi = 0; regi < 32; regi++) | |
101 | supply_register (FP0_REGNUM + regi, | |
102 | (char *)&fpregsetp->fp_r.fp_regs[regi]); | |
103 | ||
104 | supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr); | |
105 | ||
106 | /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */ | |
107 | } | |
108 | ||
109 | void | |
110 | fill_fpregset (fpregsetp, regno) | |
111 | fpregset_t *fpregsetp; | |
112 | int regno; | |
113 | { | |
114 | int regi; | |
115 | char *from, *to; | |
116 | ||
117 | for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) | |
118 | { | |
119 | if ((regno == -1) || (regno == regi)) | |
120 | { | |
121 | from = (char *) ®isters[REGISTER_BYTE (regi)]; | |
122 | to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); | |
123 | memcpy(to, from, REGISTER_RAW_SIZE (regi)); | |
124 | } | |
125 | } | |
126 | ||
127 | if ((regno == -1) || (regno == FCRCS_REGNUM)) | |
128 | fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)]; | |
129 | } | |
130 | ||
131 | ||
132 | /* Figure out where the longjmp will land. | |
133 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
134 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
135 | This routine returns true on success. */ | |
136 | ||
137 | int | |
138 | get_longjmp_target (pc) | |
139 | CORE_ADDR *pc; | |
140 | { | |
141 | char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; | |
142 | CORE_ADDR jb_addr; | |
143 | ||
144 | jb_addr = read_register (A0_REGNUM); | |
145 | ||
146 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
147 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
148 | return 0; | |
149 | ||
150 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
151 | ||
152 | return 1; | |
153 | } | |
154 | ||
155 | void | |
156 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
157 | char *core_reg_sect; | |
158 | unsigned core_reg_size; | |
159 | int which; /* Unused */ | |
160 | unsigned int reg_addr; /* Unused */ | |
161 | { | |
162 | if (core_reg_size != REGISTER_BYTES) | |
163 | { | |
164 | warning ("wrong size gregset struct in core file"); | |
165 | return; | |
166 | } | |
167 | ||
168 | memcpy ((char *)registers, core_reg_sect, core_reg_size); | |
169 | } | |
170 | \f | |
171 | /* Irix 5 uses what appears to be a unique form of shared library | |
172 | support. This is a copy of solib.c modified for Irix 5. */ | |
173 | ||
174 | #include <sys/types.h> | |
175 | #include <signal.h> | |
176 | #include <string.h> | |
177 | #include <sys/param.h> | |
178 | #include <fcntl.h> | |
179 | ||
180 | /* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts | |
181 | with our versions of those files included by tm-mips.h. Prevent | |
182 | <obj.h> from including them with some appropriate defines. */ | |
183 | #define __SYM_H__ | |
184 | #define __SYMCONST_H__ | |
185 | #include <obj.h> | |
186 | ||
187 | #include "symtab.h" | |
188 | #include "bfd.h" | |
189 | #include "symfile.h" | |
190 | #include "objfiles.h" | |
191 | #include "command.h" | |
192 | #include "frame.h" | |
193 | #include "regex.h" | |
194 | #include "inferior.h" | |
195 | #include "language.h" | |
196 | ||
197 | /* We need to set a breakpoint at a point when we know that the | |
198 | mapping of shared libraries is complete. dbx simply breaks at main | |
199 | (or, for FORTRAN, MAIN__), so we do the same. We can not break at | |
200 | the very beginning of main, because the startup code will jump into | |
201 | main after the GP initialization instructions. SOLIB_BKPT_OFFSET | |
202 | is used to skip those instructions. */ | |
203 | ||
204 | #define SOLIB_BKPT_OFFSET 12 | |
205 | ||
206 | static char *bkpt_names[] = { | |
207 | "main", | |
208 | "MAIN__", | |
209 | NULL | |
210 | }; | |
211 | ||
212 | /* The symbol which starts off the list of shared libraries. */ | |
213 | #define DEBUG_BASE "__rld_obj_head" | |
214 | ||
215 | /* How to get the loaded address of a shared library. */ | |
33c66e44 | 216 | #define LM_ADDR(so) ((so)->lm.o_praw) |
a2f1e2e5 ILT |
217 | |
218 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ | |
219 | ||
a2f1e2e5 ILT |
220 | struct so_list { |
221 | struct so_list *next; /* next structure in linked list */ | |
222 | struct obj_list ll; | |
223 | struct obj lm; /* copy of link map from inferior */ | |
224 | struct obj_list *lladdr; /* addr in inferior lm was read from */ | |
225 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
226 | char symbols_loaded; /* flag: symbols read in yet? */ | |
227 | char from_tty; /* flag: print msgs? */ | |
228 | struct objfile *objfile; /* objfile for loaded lib */ | |
229 | struct section_table *sections; | |
230 | struct section_table *sections_end; | |
231 | struct section_table *textsection; | |
232 | bfd *abfd; | |
233 | }; | |
234 | ||
235 | static struct so_list *so_list_head; /* List of known shared objects */ | |
236 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
237 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
238 | ||
239 | /* Local function prototypes */ | |
240 | ||
241 | static void | |
242 | sharedlibrary_command PARAMS ((char *, int)); | |
243 | ||
244 | static int | |
245 | enable_break PARAMS ((void)); | |
246 | ||
247 | static int | |
248 | disable_break PARAMS ((void)); | |
249 | ||
250 | static void | |
251 | info_sharedlibrary_command PARAMS ((char *, int)); | |
252 | ||
253 | static int | |
254 | symbol_add_stub PARAMS ((char *)); | |
255 | ||
256 | static struct so_list * | |
257 | find_solib PARAMS ((struct so_list *)); | |
258 | ||
259 | static struct obj_list * | |
260 | first_link_map_member PARAMS ((void)); | |
261 | ||
262 | static CORE_ADDR | |
263 | locate_base PARAMS ((void)); | |
264 | ||
265 | static void | |
266 | solib_map_sections PARAMS ((struct so_list *)); | |
267 | ||
268 | /* | |
269 | ||
270 | LOCAL FUNCTION | |
271 | ||
272 | solib_map_sections -- open bfd and build sections for shared lib | |
273 | ||
274 | SYNOPSIS | |
275 | ||
276 | static void solib_map_sections (struct so_list *so) | |
277 | ||
278 | DESCRIPTION | |
279 | ||
280 | Given a pointer to one of the shared objects in our list | |
281 | of mapped objects, use the recorded name to open a bfd | |
282 | descriptor for the object, build a section table, and then | |
283 | relocate all the section addresses by the base address at | |
284 | which the shared object was mapped. | |
285 | ||
286 | FIXMES | |
287 | ||
288 | In most (all?) cases the shared object file name recorded in the | |
289 | dynamic linkage tables will be a fully qualified pathname. For | |
290 | cases where it isn't, do we really mimic the systems search | |
291 | mechanism correctly in the below code (particularly the tilde | |
292 | expansion stuff?). | |
293 | */ | |
294 | ||
295 | static void | |
296 | solib_map_sections (so) | |
297 | struct so_list *so; | |
298 | { | |
299 | char *filename; | |
300 | char *scratch_pathname; | |
301 | int scratch_chan; | |
302 | struct section_table *p; | |
303 | struct cleanup *old_chain; | |
304 | bfd *abfd; | |
33c66e44 | 305 | CORE_ADDR offset; |
a2f1e2e5 ILT |
306 | |
307 | filename = tilde_expand (so -> lm.o_path); | |
308 | old_chain = make_cleanup (free, filename); | |
309 | ||
310 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
311 | &scratch_pathname); | |
312 | if (scratch_chan < 0) | |
313 | { | |
314 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, | |
315 | O_RDONLY, 0, &scratch_pathname); | |
316 | } | |
317 | if (scratch_chan < 0) | |
318 | { | |
319 | perror_with_name (filename); | |
320 | } | |
321 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ | |
322 | ||
323 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); | |
324 | if (!abfd) | |
325 | { | |
326 | close (scratch_chan); | |
327 | error ("Could not open `%s' as an executable file: %s", | |
c4a081e1 | 328 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
329 | } |
330 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ | |
331 | so -> abfd = abfd; | |
332 | abfd -> cacheable = true; | |
333 | ||
334 | if (!bfd_check_format (abfd, bfd_object)) | |
335 | { | |
336 | error ("\"%s\": not in executable format: %s.", | |
c4a081e1 | 337 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
338 | } |
339 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) | |
340 | { | |
341 | error ("Can't find the file sections in `%s': %s", | |
c4a081e1 | 342 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
343 | } |
344 | ||
33c66e44 PS |
345 | /* Irix 5 shared objects are pre-linked to particular addresses |
346 | although the dynamic linker may have to relocate them if the | |
347 | address ranges of the libraries used by the main program clash. | |
348 | The offset is the difference between the address where the object | |
349 | is mapped and the binding address of the shared library. */ | |
350 | offset = (CORE_ADDR) LM_ADDR (so) - so -> lm.o_base_address; | |
351 | ||
a2f1e2e5 ILT |
352 | for (p = so -> sections; p < so -> sections_end; p++) |
353 | { | |
354 | /* Relocate the section binding addresses as recorded in the shared | |
33c66e44 PS |
355 | object's file by the offset to get the address to which the |
356 | object was actually mapped. */ | |
357 | p -> addr += offset; | |
358 | p -> endaddr += offset; | |
a2f1e2e5 | 359 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); |
94d4b713 | 360 | if (STREQ (p -> the_bfd_section -> name, ".text")) |
a2f1e2e5 ILT |
361 | { |
362 | so -> textsection = p; | |
363 | } | |
364 | } | |
365 | ||
366 | /* Free the file names, close the file now. */ | |
367 | do_cleanups (old_chain); | |
368 | } | |
369 | ||
370 | /* | |
371 | ||
372 | LOCAL FUNCTION | |
373 | ||
374 | locate_base -- locate the base address of dynamic linker structs | |
375 | ||
376 | SYNOPSIS | |
377 | ||
378 | CORE_ADDR locate_base (void) | |
379 | ||
380 | DESCRIPTION | |
381 | ||
382 | For both the SunOS and SVR4 shared library implementations, if the | |
383 | inferior executable has been linked dynamically, there is a single | |
384 | address somewhere in the inferior's data space which is the key to | |
385 | locating all of the dynamic linker's runtime structures. This | |
386 | address is the value of the symbol defined by the macro DEBUG_BASE. | |
387 | The job of this function is to find and return that address, or to | |
388 | return 0 if there is no such address (the executable is statically | |
389 | linked for example). | |
390 | ||
391 | For SunOS, the job is almost trivial, since the dynamic linker and | |
392 | all of it's structures are statically linked to the executable at | |
393 | link time. Thus the symbol for the address we are looking for has | |
394 | already been added to the minimal symbol table for the executable's | |
395 | objfile at the time the symbol file's symbols were read, and all we | |
396 | have to do is look it up there. Note that we explicitly do NOT want | |
397 | to find the copies in the shared library. | |
398 | ||
399 | The SVR4 version is much more complicated because the dynamic linker | |
400 | and it's structures are located in the shared C library, which gets | |
401 | run as the executable's "interpreter" by the kernel. We have to go | |
402 | to a lot more work to discover the address of DEBUG_BASE. Because | |
403 | of this complexity, we cache the value we find and return that value | |
404 | on subsequent invocations. Note there is no copy in the executable | |
405 | symbol tables. | |
406 | ||
407 | Irix 5 is basically like SunOS. | |
408 | ||
409 | Note that we can assume nothing about the process state at the time | |
410 | we need to find this address. We may be stopped on the first instruc- | |
411 | tion of the interpreter (C shared library), the first instruction of | |
412 | the executable itself, or somewhere else entirely (if we attached | |
413 | to the process for example). | |
414 | ||
415 | */ | |
416 | ||
417 | static CORE_ADDR | |
418 | locate_base () | |
419 | { | |
420 | struct minimal_symbol *msymbol; | |
421 | CORE_ADDR address = 0; | |
422 | ||
423 | msymbol = lookup_minimal_symbol (DEBUG_BASE, symfile_objfile); | |
424 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
425 | { | |
426 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
427 | } | |
428 | return (address); | |
429 | } | |
430 | ||
431 | /* | |
432 | ||
433 | LOCAL FUNCTION | |
434 | ||
435 | first_link_map_member -- locate first member in dynamic linker's map | |
436 | ||
437 | SYNOPSIS | |
438 | ||
439 | static struct link_map *first_link_map_member (void) | |
440 | ||
441 | DESCRIPTION | |
442 | ||
443 | Read in a copy of the first member in the inferior's dynamic | |
444 | link map from the inferior's dynamic linker structures, and return | |
445 | a pointer to the copy in our address space. | |
446 | */ | |
447 | ||
448 | static struct obj_list * | |
449 | first_link_map_member () | |
450 | { | |
451 | struct obj_list *lm; | |
452 | struct obj_list s; | |
453 | ||
454 | read_memory (debug_base, (char *) &lm, sizeof (struct obj_list *)); | |
455 | ||
456 | if (lm == NULL) | |
457 | return NULL; | |
458 | ||
459 | /* The first entry in the list is the object file we are debugging, | |
460 | so skip it. */ | |
461 | read_memory ((CORE_ADDR) lm, (char *) &s, sizeof (struct obj_list)); | |
462 | ||
463 | return s.next; | |
464 | } | |
465 | ||
466 | /* | |
467 | ||
468 | LOCAL FUNCTION | |
469 | ||
470 | find_solib -- step through list of shared objects | |
471 | ||
472 | SYNOPSIS | |
473 | ||
474 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
475 | ||
476 | DESCRIPTION | |
477 | ||
478 | This module contains the routine which finds the names of any | |
479 | loaded "images" in the current process. The argument in must be | |
480 | NULL on the first call, and then the returned value must be passed | |
481 | in on subsequent calls. This provides the capability to "step" down | |
482 | the list of loaded objects. On the last object, a NULL value is | |
483 | returned. | |
484 | */ | |
485 | ||
486 | static struct so_list * | |
487 | find_solib (so_list_ptr) | |
488 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
489 | { | |
490 | struct so_list *so_list_next = NULL; | |
491 | struct obj_list *lm = NULL; | |
492 | struct so_list *new; | |
493 | ||
494 | if (so_list_ptr == NULL) | |
495 | { | |
496 | /* We are setting up for a new scan through the loaded images. */ | |
497 | if ((so_list_next = so_list_head) == NULL) | |
498 | { | |
499 | /* We have not already read in the dynamic linking structures | |
500 | from the inferior, lookup the address of the base structure. */ | |
501 | debug_base = locate_base (); | |
502 | if (debug_base != 0) | |
503 | { | |
504 | /* Read the base structure in and find the address of the first | |
505 | link map list member. */ | |
506 | lm = first_link_map_member (); | |
507 | } | |
508 | } | |
509 | } | |
510 | else | |
511 | { | |
512 | /* We have been called before, and are in the process of walking | |
513 | the shared library list. Advance to the next shared object. */ | |
514 | if ((lm = so_list_ptr->ll.next) == NULL) | |
515 | { | |
516 | /* We have hit the end of the list, so check to see if any were | |
517 | added, but be quiet if we can't read from the target any more. */ | |
518 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lladdr, | |
519 | (char *) &(so_list_ptr -> ll), | |
520 | sizeof (struct obj_list)); | |
521 | if (status == 0) | |
522 | { | |
523 | lm = so_list_ptr->ll.next; | |
524 | } | |
525 | else | |
526 | { | |
527 | lm = NULL; | |
528 | } | |
529 | } | |
530 | so_list_next = so_list_ptr -> next; | |
531 | } | |
532 | if ((so_list_next == NULL) && (lm != NULL)) | |
533 | { | |
4ad0021e JK |
534 | int errcode; |
535 | char *buffer; | |
536 | ||
a2f1e2e5 ILT |
537 | /* Get next link map structure from inferior image and build a local |
538 | abbreviated load_map structure */ | |
539 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
540 | memset ((char *) new, 0, sizeof (struct so_list)); | |
541 | new -> lladdr = lm; | |
542 | /* Add the new node as the next node in the list, or as the root | |
543 | node if this is the first one. */ | |
544 | if (so_list_ptr != NULL) | |
545 | { | |
546 | so_list_ptr -> next = new; | |
547 | } | |
548 | else | |
549 | { | |
550 | so_list_head = new; | |
551 | } | |
552 | so_list_next = new; | |
553 | read_memory ((CORE_ADDR) lm, (char *) &(new -> ll), | |
554 | sizeof (struct obj_list)); | |
555 | read_memory ((CORE_ADDR) new->ll.data, (char *) &(new -> lm), | |
556 | sizeof (struct obj)); | |
ce2f21b2 JK |
557 | target_read_string ((CORE_ADDR)new->lm.o_path, &buffer, |
558 | INT_MAX, &errcode); | |
4ad0021e | 559 | if (errcode != 0) |
ce2f21b2 | 560 | memory_error (errcode, (CORE_ADDR)new->lm.o_path); |
4ad0021e | 561 | new->lm.o_path = buffer; |
a2f1e2e5 ILT |
562 | solib_map_sections (new); |
563 | } | |
564 | return (so_list_next); | |
565 | } | |
566 | ||
567 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ | |
568 | ||
569 | static int | |
570 | symbol_add_stub (arg) | |
571 | char *arg; | |
572 | { | |
573 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ | |
574 | ||
575 | so -> objfile = symbol_file_add (so -> lm.o_path, so -> from_tty, | |
576 | (unsigned int) so -> textsection -> addr, | |
577 | 0, 0, 0); | |
578 | return (1); | |
579 | } | |
580 | ||
581 | /* | |
582 | ||
583 | GLOBAL FUNCTION | |
584 | ||
585 | solib_add -- add a shared library file to the symtab and section list | |
586 | ||
587 | SYNOPSIS | |
588 | ||
589 | void solib_add (char *arg_string, int from_tty, | |
590 | struct target_ops *target) | |
591 | ||
592 | DESCRIPTION | |
593 | ||
594 | */ | |
595 | ||
596 | void | |
597 | solib_add (arg_string, from_tty, target) | |
598 | char *arg_string; | |
599 | int from_tty; | |
600 | struct target_ops *target; | |
601 | { | |
602 | register struct so_list *so = NULL; /* link map state variable */ | |
603 | ||
604 | /* Last shared library that we read. */ | |
605 | struct so_list *so_last = NULL; | |
606 | ||
607 | char *re_err; | |
608 | int count; | |
609 | int old; | |
610 | ||
611 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
612 | { | |
613 | error ("Invalid regexp: %s", re_err); | |
614 | } | |
615 | ||
0d98155c PS |
616 | /* Add the shared library sections to the section table of the |
617 | specified target, if any. We have to do this before reading the | |
618 | symbol files as symbol_file_add calls reinit_frame_cache and | |
619 | creating a new frame might access memory in the shared library. */ | |
a2f1e2e5 ILT |
620 | if (target) |
621 | { | |
622 | /* Count how many new section_table entries there are. */ | |
623 | so = NULL; | |
624 | count = 0; | |
625 | while ((so = find_solib (so)) != NULL) | |
626 | { | |
627 | if (so -> lm.o_path[0]) | |
628 | { | |
629 | count += so -> sections_end - so -> sections; | |
630 | } | |
631 | } | |
632 | ||
633 | if (count) | |
634 | { | |
635 | /* Reallocate the target's section table including the new size. */ | |
636 | if (target -> to_sections) | |
637 | { | |
638 | old = target -> to_sections_end - target -> to_sections; | |
639 | target -> to_sections = (struct section_table *) | |
640 | xrealloc ((char *)target -> to_sections, | |
641 | (sizeof (struct section_table)) * (count + old)); | |
642 | } | |
643 | else | |
644 | { | |
645 | old = 0; | |
646 | target -> to_sections = (struct section_table *) | |
647 | xmalloc ((sizeof (struct section_table)) * count); | |
648 | } | |
649 | target -> to_sections_end = target -> to_sections + (count + old); | |
650 | ||
651 | /* Add these section table entries to the target's table. */ | |
652 | while ((so = find_solib (so)) != NULL) | |
653 | { | |
654 | if (so -> lm.o_path[0]) | |
655 | { | |
656 | count = so -> sections_end - so -> sections; | |
657 | memcpy ((char *) (target -> to_sections + old), | |
658 | so -> sections, | |
659 | (sizeof (struct section_table)) * count); | |
660 | old += count; | |
661 | } | |
662 | } | |
663 | } | |
664 | } | |
0d98155c PS |
665 | |
666 | /* Now add the symbol files. */ | |
667 | while ((so = find_solib (so)) != NULL) | |
668 | { | |
669 | if (so -> lm.o_path[0] && re_exec (so -> lm.o_path)) | |
670 | { | |
671 | so -> from_tty = from_tty; | |
672 | if (so -> symbols_loaded) | |
673 | { | |
674 | if (from_tty) | |
675 | { | |
676 | printf_unfiltered ("Symbols already loaded for %s\n", so -> lm.o_path); | |
677 | } | |
678 | } | |
679 | else if (catch_errors | |
680 | (symbol_add_stub, (char *) so, | |
681 | "Error while reading shared library symbols:\n", | |
682 | RETURN_MASK_ALL)) | |
683 | { | |
684 | so_last = so; | |
685 | so -> symbols_loaded = 1; | |
686 | } | |
687 | } | |
688 | } | |
a2f1e2e5 ILT |
689 | } |
690 | ||
691 | /* | |
692 | ||
693 | LOCAL FUNCTION | |
694 | ||
695 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
696 | ||
697 | SYNOPSIS | |
698 | ||
699 | static void info_sharedlibrary_command () | |
700 | ||
701 | DESCRIPTION | |
702 | ||
703 | Walk through the shared library list and print information | |
704 | about each attached library. | |
705 | */ | |
706 | ||
707 | static void | |
708 | info_sharedlibrary_command (ignore, from_tty) | |
709 | char *ignore; | |
710 | int from_tty; | |
711 | { | |
712 | register struct so_list *so = NULL; /* link map state variable */ | |
713 | int header_done = 0; | |
714 | ||
715 | if (exec_bfd == NULL) | |
716 | { | |
717 | printf_unfiltered ("No exec file.\n"); | |
718 | return; | |
719 | } | |
720 | while ((so = find_solib (so)) != NULL) | |
721 | { | |
722 | if (so -> lm.o_path[0]) | |
723 | { | |
724 | if (!header_done) | |
725 | { | |
726 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", | |
727 | "Shared Object Library"); | |
728 | header_done++; | |
729 | } | |
730 | printf_unfiltered ("%-12s", | |
731 | local_hex_string_custom ((unsigned long) LM_ADDR (so), | |
732 | "08l")); | |
733 | printf_unfiltered ("%-12s", | |
734 | local_hex_string_custom ((unsigned long) so -> lmend, | |
735 | "08l")); | |
736 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); | |
737 | printf_unfiltered ("%s\n", so -> lm.o_path); | |
738 | } | |
739 | } | |
740 | if (so_list_head == NULL) | |
741 | { | |
742 | printf_unfiltered ("No shared libraries loaded at this time.\n"); | |
743 | } | |
744 | } | |
745 | ||
746 | /* | |
747 | ||
748 | GLOBAL FUNCTION | |
749 | ||
750 | solib_address -- check to see if an address is in a shared lib | |
751 | ||
752 | SYNOPSIS | |
753 | ||
754 | int solib_address (CORE_ADDR address) | |
755 | ||
756 | DESCRIPTION | |
757 | ||
758 | Provides a hook for other gdb routines to discover whether or | |
759 | not a particular address is within the mapped address space of | |
760 | a shared library. Any address between the base mapping address | |
761 | and the first address beyond the end of the last mapping, is | |
762 | considered to be within the shared library address space, for | |
763 | our purposes. | |
764 | ||
765 | For example, this routine is called at one point to disable | |
766 | breakpoints which are in shared libraries that are not currently | |
767 | mapped in. | |
768 | */ | |
769 | ||
770 | int | |
771 | solib_address (address) | |
772 | CORE_ADDR address; | |
773 | { | |
774 | register struct so_list *so = 0; /* link map state variable */ | |
775 | ||
776 | while ((so = find_solib (so)) != NULL) | |
777 | { | |
778 | if (so -> lm.o_path[0]) | |
779 | { | |
33c66e44 | 780 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && |
a2f1e2e5 ILT |
781 | (address < (CORE_ADDR) so -> lmend)) |
782 | { | |
783 | return (1); | |
784 | } | |
785 | } | |
786 | } | |
787 | return (0); | |
788 | } | |
789 | ||
790 | /* Called by free_all_symtabs */ | |
791 | ||
792 | void | |
793 | clear_solib() | |
794 | { | |
795 | struct so_list *next; | |
796 | char *bfd_filename; | |
797 | ||
798 | while (so_list_head) | |
799 | { | |
800 | if (so_list_head -> sections) | |
801 | { | |
802 | free ((PTR)so_list_head -> sections); | |
803 | } | |
804 | if (so_list_head -> abfd) | |
805 | { | |
806 | bfd_filename = bfd_get_filename (so_list_head -> abfd); | |
807 | bfd_close (so_list_head -> abfd); | |
808 | } | |
809 | else | |
810 | /* This happens for the executable on SVR4. */ | |
811 | bfd_filename = NULL; | |
4ad0021e | 812 | |
a2f1e2e5 ILT |
813 | next = so_list_head -> next; |
814 | if (bfd_filename) | |
815 | free ((PTR)bfd_filename); | |
4ad0021e | 816 | free (so_list_head->lm.o_path); |
a2f1e2e5 ILT |
817 | free ((PTR)so_list_head); |
818 | so_list_head = next; | |
819 | } | |
820 | debug_base = 0; | |
821 | } | |
822 | ||
823 | /* | |
824 | ||
825 | LOCAL FUNCTION | |
826 | ||
827 | disable_break -- remove the "mapping changed" breakpoint | |
828 | ||
829 | SYNOPSIS | |
830 | ||
831 | static int disable_break () | |
832 | ||
833 | DESCRIPTION | |
834 | ||
835 | Removes the breakpoint that gets hit when the dynamic linker | |
836 | completes a mapping change. | |
837 | ||
838 | */ | |
839 | ||
840 | static int | |
841 | disable_break () | |
842 | { | |
843 | int status = 1; | |
844 | ||
845 | ||
846 | /* Note that breakpoint address and original contents are in our address | |
847 | space, so we just need to write the original contents back. */ | |
848 | ||
849 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
850 | { | |
851 | status = 0; | |
852 | } | |
853 | ||
854 | /* For the SVR4 version, we always know the breakpoint address. For the | |
855 | SunOS version we don't know it until the above code is executed. | |
856 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
857 | ||
858 | if (stop_pc != breakpoint_addr) | |
859 | { | |
860 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
861 | } | |
862 | ||
863 | return (status); | |
864 | } | |
865 | ||
866 | /* | |
867 | ||
868 | LOCAL FUNCTION | |
869 | ||
870 | enable_break -- arrange for dynamic linker to hit breakpoint | |
871 | ||
872 | SYNOPSIS | |
873 | ||
874 | int enable_break (void) | |
875 | ||
876 | DESCRIPTION | |
877 | ||
878 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
879 | debugger interface, support for arranging for the inferior to hit | |
880 | a breakpoint after mapping in the shared libraries. This function | |
881 | enables that breakpoint. | |
882 | ||
883 | For SunOS, there is a special flag location (in_debugger) which we | |
884 | set to 1. When the dynamic linker sees this flag set, it will set | |
885 | a breakpoint at a location known only to itself, after saving the | |
886 | original contents of that place and the breakpoint address itself, | |
887 | in it's own internal structures. When we resume the inferior, it | |
888 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
889 | We handle this (in a different place) by restoring the contents of | |
890 | the breakpointed location (which is only known after it stops), | |
891 | chasing around to locate the shared libraries that have been | |
892 | loaded, then resuming. | |
893 | ||
894 | For SVR4, the debugger interface structure contains a member (r_brk) | |
895 | which is statically initialized at the time the shared library is | |
896 | built, to the offset of a function (_r_debug_state) which is guaran- | |
897 | teed to be called once before mapping in a library, and again when | |
898 | the mapping is complete. At the time we are examining this member, | |
899 | it contains only the unrelocated offset of the function, so we have | |
900 | to do our own relocation. Later, when the dynamic linker actually | |
901 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
902 | ||
903 | The debugger interface structure also contains an enumeration which | |
904 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
905 | depending upon whether or not the library is being mapped or unmapped, | |
906 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
907 | ||
908 | Irix 5, on the other hand, has no such features. Instead, we | |
909 | set a breakpoint at main. | |
910 | */ | |
911 | ||
912 | static int | |
913 | enable_break () | |
914 | { | |
915 | int success = 0; | |
916 | struct minimal_symbol *msymbol; | |
917 | char **bkpt_namep; | |
918 | CORE_ADDR bkpt_addr; | |
919 | ||
920 | /* Scan through the list of symbols, trying to look up the symbol and | |
921 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
922 | ||
923 | breakpoint_addr = 0; | |
924 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
925 | { | |
926 | msymbol = lookup_minimal_symbol (*bkpt_namep, symfile_objfile); | |
927 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
928 | { | |
929 | bkpt_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
930 | #ifdef SOLIB_BKPT_OFFSET | |
931 | /* We only want to skip if bkpt_addr is currently pointing | |
932 | at a GP setting instruction. */ | |
933 | { | |
934 | char buf[4]; | |
935 | ||
936 | if (target_read_memory (bkpt_addr, buf, 4) == 0) | |
937 | { | |
938 | unsigned long insn; | |
939 | ||
940 | insn = extract_unsigned_integer (buf, 4); | |
941 | if ((insn & 0xffff0000) == 0x3c1c0000) /* lui $gp,n */ | |
942 | bkpt_addr += SOLIB_BKPT_OFFSET; | |
943 | } | |
944 | } | |
945 | #endif | |
946 | if (target_insert_breakpoint (bkpt_addr, shadow_contents) == 0) | |
947 | { | |
948 | breakpoint_addr = bkpt_addr; | |
949 | success = 1; | |
950 | break; | |
951 | } | |
952 | } | |
953 | } | |
954 | ||
955 | return (success); | |
956 | } | |
957 | ||
958 | /* | |
959 | ||
960 | GLOBAL FUNCTION | |
961 | ||
962 | solib_create_inferior_hook -- shared library startup support | |
963 | ||
964 | SYNOPSIS | |
965 | ||
966 | void solib_create_inferior_hook() | |
967 | ||
968 | DESCRIPTION | |
969 | ||
970 | When gdb starts up the inferior, it nurses it along (through the | |
971 | shell) until it is ready to execute it's first instruction. At this | |
972 | point, this function gets called via expansion of the macro | |
973 | SOLIB_CREATE_INFERIOR_HOOK. | |
974 | ||
975 | For SunOS executables, this first instruction is typically the | |
976 | one at "_start", or a similar text label, regardless of whether | |
977 | the executable is statically or dynamically linked. The runtime | |
978 | startup code takes care of dynamically linking in any shared | |
979 | libraries, once gdb allows the inferior to continue. | |
980 | ||
981 | For SVR4 executables, this first instruction is either the first | |
982 | instruction in the dynamic linker (for dynamically linked | |
983 | executables) or the instruction at "start" for statically linked | |
984 | executables. For dynamically linked executables, the system | |
985 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
986 | and starts it running. The dynamic linker maps in any needed | |
987 | shared libraries, maps in the actual user executable, and then | |
988 | jumps to "start" in the user executable. | |
989 | ||
990 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
991 | can arrange to cooperate with the dynamic linker to discover the | |
992 | names of shared libraries that are dynamically linked, and the | |
993 | base addresses to which they are linked. | |
994 | ||
995 | This function is responsible for discovering those names and | |
996 | addresses, and saving sufficient information about them to allow | |
997 | their symbols to be read at a later time. | |
998 | ||
999 | FIXME | |
1000 | ||
1001 | Between enable_break() and disable_break(), this code does not | |
1002 | properly handle hitting breakpoints which the user might have | |
1003 | set in the startup code or in the dynamic linker itself. Proper | |
1004 | handling will probably have to wait until the implementation is | |
1005 | changed to use the "breakpoint handler function" method. | |
1006 | ||
1007 | Also, what if child has exit()ed? Must exit loop somehow. | |
1008 | */ | |
1009 | ||
1010 | void | |
1011 | solib_create_inferior_hook() | |
1012 | { | |
1013 | if (!enable_break ()) | |
1014 | { | |
1015 | warning ("shared library handler failed to enable breakpoint"); | |
1016 | return; | |
1017 | } | |
1018 | ||
1019 | /* Now run the target. It will eventually hit the breakpoint, at | |
1020 | which point all of the libraries will have been mapped in and we | |
1021 | can go groveling around in the dynamic linker structures to find | |
1022 | out what we need to know about them. */ | |
1023 | ||
1024 | clear_proceed_status (); | |
1025 | stop_soon_quietly = 1; | |
1026 | stop_signal = 0; | |
1027 | do | |
1028 | { | |
1029 | target_resume (-1, 0, stop_signal); | |
1030 | wait_for_inferior (); | |
1031 | } | |
1032 | while (stop_signal != SIGTRAP); | |
1033 | stop_soon_quietly = 0; | |
1034 | ||
1035 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1036 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1037 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1038 | add any shared libraries that were mapped in. */ | |
1039 | ||
1040 | if (DECR_PC_AFTER_BREAK) | |
1041 | { | |
1042 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1043 | write_register (PC_REGNUM, stop_pc); | |
1044 | } | |
1045 | ||
1046 | if (!disable_break ()) | |
1047 | { | |
1048 | warning ("shared library handler failed to disable breakpoint"); | |
1049 | } | |
1050 | ||
1051 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | ||
1056 | LOCAL FUNCTION | |
1057 | ||
1058 | sharedlibrary_command -- handle command to explicitly add library | |
1059 | ||
1060 | SYNOPSIS | |
1061 | ||
1062 | static void sharedlibrary_command (char *args, int from_tty) | |
1063 | ||
1064 | DESCRIPTION | |
1065 | ||
1066 | */ | |
1067 | ||
1068 | static void | |
1069 | sharedlibrary_command (args, from_tty) | |
1070 | char *args; | |
1071 | int from_tty; | |
1072 | { | |
1073 | dont_repeat (); | |
1074 | solib_add (args, from_tty, (struct target_ops *) 0); | |
1075 | } | |
1076 | ||
1077 | void | |
1078 | _initialize_solib() | |
1079 | { | |
1080 | ||
1081 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
1082 | "Load shared object library symbols for files matching REGEXP."); | |
1083 | add_info ("sharedlibrary", info_sharedlibrary_command, | |
1084 | "Status of loaded shared object libraries."); | |
1085 | } |