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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 | ||
220 | extern CORE_ADDR sigtramp_address, sigtramp_end; | |
221 | ||
222 | struct so_list { | |
223 | struct so_list *next; /* next structure in linked list */ | |
224 | struct obj_list ll; | |
225 | struct obj lm; /* copy of link map from inferior */ | |
226 | struct obj_list *lladdr; /* addr in inferior lm was read from */ | |
227 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
228 | char symbols_loaded; /* flag: symbols read in yet? */ | |
229 | char from_tty; /* flag: print msgs? */ | |
230 | struct objfile *objfile; /* objfile for loaded lib */ | |
231 | struct section_table *sections; | |
232 | struct section_table *sections_end; | |
233 | struct section_table *textsection; | |
234 | bfd *abfd; | |
235 | }; | |
236 | ||
237 | static struct so_list *so_list_head; /* List of known shared objects */ | |
238 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
239 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
240 | ||
241 | /* Local function prototypes */ | |
242 | ||
243 | static void | |
244 | sharedlibrary_command PARAMS ((char *, int)); | |
245 | ||
246 | static int | |
247 | enable_break PARAMS ((void)); | |
248 | ||
249 | static int | |
250 | disable_break PARAMS ((void)); | |
251 | ||
252 | static void | |
253 | info_sharedlibrary_command PARAMS ((char *, int)); | |
254 | ||
255 | static int | |
256 | symbol_add_stub PARAMS ((char *)); | |
257 | ||
258 | static struct so_list * | |
259 | find_solib PARAMS ((struct so_list *)); | |
260 | ||
261 | static struct obj_list * | |
262 | first_link_map_member PARAMS ((void)); | |
263 | ||
264 | static CORE_ADDR | |
265 | locate_base PARAMS ((void)); | |
266 | ||
267 | static void | |
268 | solib_map_sections PARAMS ((struct so_list *)); | |
269 | ||
270 | /* | |
271 | ||
272 | LOCAL FUNCTION | |
273 | ||
274 | solib_map_sections -- open bfd and build sections for shared lib | |
275 | ||
276 | SYNOPSIS | |
277 | ||
278 | static void solib_map_sections (struct so_list *so) | |
279 | ||
280 | DESCRIPTION | |
281 | ||
282 | Given a pointer to one of the shared objects in our list | |
283 | of mapped objects, use the recorded name to open a bfd | |
284 | descriptor for the object, build a section table, and then | |
285 | relocate all the section addresses by the base address at | |
286 | which the shared object was mapped. | |
287 | ||
288 | FIXMES | |
289 | ||
290 | In most (all?) cases the shared object file name recorded in the | |
291 | dynamic linkage tables will be a fully qualified pathname. For | |
292 | cases where it isn't, do we really mimic the systems search | |
293 | mechanism correctly in the below code (particularly the tilde | |
294 | expansion stuff?). | |
295 | */ | |
296 | ||
297 | static void | |
298 | solib_map_sections (so) | |
299 | struct so_list *so; | |
300 | { | |
301 | char *filename; | |
302 | char *scratch_pathname; | |
303 | int scratch_chan; | |
304 | struct section_table *p; | |
305 | struct cleanup *old_chain; | |
306 | bfd *abfd; | |
33c66e44 | 307 | CORE_ADDR offset; |
a2f1e2e5 ILT |
308 | |
309 | filename = tilde_expand (so -> lm.o_path); | |
310 | old_chain = make_cleanup (free, filename); | |
311 | ||
312 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
313 | &scratch_pathname); | |
314 | if (scratch_chan < 0) | |
315 | { | |
316 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, | |
317 | O_RDONLY, 0, &scratch_pathname); | |
318 | } | |
319 | if (scratch_chan < 0) | |
320 | { | |
321 | perror_with_name (filename); | |
322 | } | |
323 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ | |
324 | ||
325 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); | |
326 | if (!abfd) | |
327 | { | |
328 | close (scratch_chan); | |
329 | error ("Could not open `%s' as an executable file: %s", | |
c4a081e1 | 330 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
331 | } |
332 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ | |
333 | so -> abfd = abfd; | |
334 | abfd -> cacheable = true; | |
335 | ||
336 | if (!bfd_check_format (abfd, bfd_object)) | |
337 | { | |
338 | error ("\"%s\": not in executable format: %s.", | |
c4a081e1 | 339 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
340 | } |
341 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) | |
342 | { | |
343 | error ("Can't find the file sections in `%s': %s", | |
c4a081e1 | 344 | bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
a2f1e2e5 ILT |
345 | } |
346 | ||
33c66e44 PS |
347 | /* Irix 5 shared objects are pre-linked to particular addresses |
348 | although the dynamic linker may have to relocate them if the | |
349 | address ranges of the libraries used by the main program clash. | |
350 | The offset is the difference between the address where the object | |
351 | is mapped and the binding address of the shared library. */ | |
352 | offset = (CORE_ADDR) LM_ADDR (so) - so -> lm.o_base_address; | |
353 | ||
a2f1e2e5 ILT |
354 | for (p = so -> sections; p < so -> sections_end; p++) |
355 | { | |
356 | /* Relocate the section binding addresses as recorded in the shared | |
33c66e44 PS |
357 | object's file by the offset to get the address to which the |
358 | object was actually mapped. */ | |
359 | p -> addr += offset; | |
360 | p -> endaddr += offset; | |
a2f1e2e5 | 361 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); |
94d4b713 | 362 | if (STREQ (p -> the_bfd_section -> name, ".text")) |
a2f1e2e5 ILT |
363 | { |
364 | so -> textsection = p; | |
365 | } | |
366 | } | |
367 | ||
368 | /* Free the file names, close the file now. */ | |
369 | do_cleanups (old_chain); | |
370 | } | |
371 | ||
372 | /* | |
373 | ||
374 | LOCAL FUNCTION | |
375 | ||
376 | locate_base -- locate the base address of dynamic linker structs | |
377 | ||
378 | SYNOPSIS | |
379 | ||
380 | CORE_ADDR locate_base (void) | |
381 | ||
382 | DESCRIPTION | |
383 | ||
384 | For both the SunOS and SVR4 shared library implementations, if the | |
385 | inferior executable has been linked dynamically, there is a single | |
386 | address somewhere in the inferior's data space which is the key to | |
387 | locating all of the dynamic linker's runtime structures. This | |
388 | address is the value of the symbol defined by the macro DEBUG_BASE. | |
389 | The job of this function is to find and return that address, or to | |
390 | return 0 if there is no such address (the executable is statically | |
391 | linked for example). | |
392 | ||
393 | For SunOS, the job is almost trivial, since the dynamic linker and | |
394 | all of it's structures are statically linked to the executable at | |
395 | link time. Thus the symbol for the address we are looking for has | |
396 | already been added to the minimal symbol table for the executable's | |
397 | objfile at the time the symbol file's symbols were read, and all we | |
398 | have to do is look it up there. Note that we explicitly do NOT want | |
399 | to find the copies in the shared library. | |
400 | ||
401 | The SVR4 version is much more complicated because the dynamic linker | |
402 | and it's structures are located in the shared C library, which gets | |
403 | run as the executable's "interpreter" by the kernel. We have to go | |
404 | to a lot more work to discover the address of DEBUG_BASE. Because | |
405 | of this complexity, we cache the value we find and return that value | |
406 | on subsequent invocations. Note there is no copy in the executable | |
407 | symbol tables. | |
408 | ||
409 | Irix 5 is basically like SunOS. | |
410 | ||
411 | Note that we can assume nothing about the process state at the time | |
412 | we need to find this address. We may be stopped on the first instruc- | |
413 | tion of the interpreter (C shared library), the first instruction of | |
414 | the executable itself, or somewhere else entirely (if we attached | |
415 | to the process for example). | |
416 | ||
417 | */ | |
418 | ||
419 | static CORE_ADDR | |
420 | locate_base () | |
421 | { | |
422 | struct minimal_symbol *msymbol; | |
423 | CORE_ADDR address = 0; | |
424 | ||
425 | msymbol = lookup_minimal_symbol (DEBUG_BASE, symfile_objfile); | |
426 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
427 | { | |
428 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
429 | } | |
430 | return (address); | |
431 | } | |
432 | ||
433 | /* | |
434 | ||
435 | LOCAL FUNCTION | |
436 | ||
437 | first_link_map_member -- locate first member in dynamic linker's map | |
438 | ||
439 | SYNOPSIS | |
440 | ||
441 | static struct link_map *first_link_map_member (void) | |
442 | ||
443 | DESCRIPTION | |
444 | ||
445 | Read in a copy of the first member in the inferior's dynamic | |
446 | link map from the inferior's dynamic linker structures, and return | |
447 | a pointer to the copy in our address space. | |
448 | */ | |
449 | ||
450 | static struct obj_list * | |
451 | first_link_map_member () | |
452 | { | |
453 | struct obj_list *lm; | |
454 | struct obj_list s; | |
455 | ||
456 | read_memory (debug_base, (char *) &lm, sizeof (struct obj_list *)); | |
457 | ||
458 | if (lm == NULL) | |
459 | return NULL; | |
460 | ||
461 | /* The first entry in the list is the object file we are debugging, | |
462 | so skip it. */ | |
463 | read_memory ((CORE_ADDR) lm, (char *) &s, sizeof (struct obj_list)); | |
464 | ||
465 | return s.next; | |
466 | } | |
467 | ||
468 | /* | |
469 | ||
470 | LOCAL FUNCTION | |
471 | ||
472 | find_solib -- step through list of shared objects | |
473 | ||
474 | SYNOPSIS | |
475 | ||
476 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
477 | ||
478 | DESCRIPTION | |
479 | ||
480 | This module contains the routine which finds the names of any | |
481 | loaded "images" in the current process. The argument in must be | |
482 | NULL on the first call, and then the returned value must be passed | |
483 | in on subsequent calls. This provides the capability to "step" down | |
484 | the list of loaded objects. On the last object, a NULL value is | |
485 | returned. | |
486 | */ | |
487 | ||
488 | static struct so_list * | |
489 | find_solib (so_list_ptr) | |
490 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
491 | { | |
492 | struct so_list *so_list_next = NULL; | |
493 | struct obj_list *lm = NULL; | |
494 | struct so_list *new; | |
495 | ||
496 | if (so_list_ptr == NULL) | |
497 | { | |
498 | /* We are setting up for a new scan through the loaded images. */ | |
499 | if ((so_list_next = so_list_head) == NULL) | |
500 | { | |
501 | /* We have not already read in the dynamic linking structures | |
502 | from the inferior, lookup the address of the base structure. */ | |
503 | debug_base = locate_base (); | |
504 | if (debug_base != 0) | |
505 | { | |
506 | /* Read the base structure in and find the address of the first | |
507 | link map list member. */ | |
508 | lm = first_link_map_member (); | |
509 | } | |
510 | } | |
511 | } | |
512 | else | |
513 | { | |
514 | /* We have been called before, and are in the process of walking | |
515 | the shared library list. Advance to the next shared object. */ | |
516 | if ((lm = so_list_ptr->ll.next) == NULL) | |
517 | { | |
518 | /* We have hit the end of the list, so check to see if any were | |
519 | added, but be quiet if we can't read from the target any more. */ | |
520 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lladdr, | |
521 | (char *) &(so_list_ptr -> ll), | |
522 | sizeof (struct obj_list)); | |
523 | if (status == 0) | |
524 | { | |
525 | lm = so_list_ptr->ll.next; | |
526 | } | |
527 | else | |
528 | { | |
529 | lm = NULL; | |
530 | } | |
531 | } | |
532 | so_list_next = so_list_ptr -> next; | |
533 | } | |
534 | if ((so_list_next == NULL) && (lm != NULL)) | |
535 | { | |
4ad0021e JK |
536 | int errcode; |
537 | char *buffer; | |
538 | ||
a2f1e2e5 ILT |
539 | /* Get next link map structure from inferior image and build a local |
540 | abbreviated load_map structure */ | |
541 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
542 | memset ((char *) new, 0, sizeof (struct so_list)); | |
543 | new -> lladdr = lm; | |
544 | /* Add the new node as the next node in the list, or as the root | |
545 | node if this is the first one. */ | |
546 | if (so_list_ptr != NULL) | |
547 | { | |
548 | so_list_ptr -> next = new; | |
549 | } | |
550 | else | |
551 | { | |
552 | so_list_head = new; | |
553 | } | |
554 | so_list_next = new; | |
555 | read_memory ((CORE_ADDR) lm, (char *) &(new -> ll), | |
556 | sizeof (struct obj_list)); | |
557 | read_memory ((CORE_ADDR) new->ll.data, (char *) &(new -> lm), | |
558 | sizeof (struct obj)); | |
ce2f21b2 JK |
559 | target_read_string ((CORE_ADDR)new->lm.o_path, &buffer, |
560 | INT_MAX, &errcode); | |
4ad0021e | 561 | if (errcode != 0) |
ce2f21b2 | 562 | memory_error (errcode, (CORE_ADDR)new->lm.o_path); |
4ad0021e | 563 | new->lm.o_path = buffer; |
a2f1e2e5 ILT |
564 | solib_map_sections (new); |
565 | } | |
566 | return (so_list_next); | |
567 | } | |
568 | ||
569 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ | |
570 | ||
571 | static int | |
572 | symbol_add_stub (arg) | |
573 | char *arg; | |
574 | { | |
575 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ | |
576 | ||
577 | so -> objfile = symbol_file_add (so -> lm.o_path, so -> from_tty, | |
578 | (unsigned int) so -> textsection -> addr, | |
579 | 0, 0, 0); | |
580 | return (1); | |
581 | } | |
582 | ||
583 | /* | |
584 | ||
585 | GLOBAL FUNCTION | |
586 | ||
587 | solib_add -- add a shared library file to the symtab and section list | |
588 | ||
589 | SYNOPSIS | |
590 | ||
591 | void solib_add (char *arg_string, int from_tty, | |
592 | struct target_ops *target) | |
593 | ||
594 | DESCRIPTION | |
595 | ||
596 | */ | |
597 | ||
598 | void | |
599 | solib_add (arg_string, from_tty, target) | |
600 | char *arg_string; | |
601 | int from_tty; | |
602 | struct target_ops *target; | |
603 | { | |
604 | register struct so_list *so = NULL; /* link map state variable */ | |
605 | ||
606 | /* Last shared library that we read. */ | |
607 | struct so_list *so_last = NULL; | |
608 | ||
609 | char *re_err; | |
610 | int count; | |
611 | int old; | |
612 | ||
613 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
614 | { | |
615 | error ("Invalid regexp: %s", re_err); | |
616 | } | |
617 | ||
618 | /* Getting new symbols may change our opinion about what is | |
619 | frameless. */ | |
620 | reinit_frame_cache (); | |
621 | /* Not to mention where _sigtramp is. */ | |
622 | sigtramp_address = 0; | |
623 | ||
624 | while ((so = find_solib (so)) != NULL) | |
625 | { | |
626 | if (so -> lm.o_path[0] && re_exec (so -> lm.o_path)) | |
627 | { | |
628 | so -> from_tty = from_tty; | |
629 | if (so -> symbols_loaded) | |
630 | { | |
631 | if (from_tty) | |
632 | { | |
633 | printf_unfiltered ("Symbols already loaded for %s\n", so -> lm.o_path); | |
634 | } | |
635 | } | |
636 | else if (catch_errors | |
637 | (symbol_add_stub, (char *) so, | |
638 | "Error while reading shared library symbols:\n", | |
639 | RETURN_MASK_ALL)) | |
640 | { | |
641 | so_last = so; | |
642 | so -> symbols_loaded = 1; | |
643 | } | |
644 | } | |
645 | } | |
646 | ||
647 | /* Now add the shared library sections to the section table of the | |
648 | specified target, if any. */ | |
649 | if (target) | |
650 | { | |
651 | /* Count how many new section_table entries there are. */ | |
652 | so = NULL; | |
653 | count = 0; | |
654 | while ((so = find_solib (so)) != NULL) | |
655 | { | |
656 | if (so -> lm.o_path[0]) | |
657 | { | |
658 | count += so -> sections_end - so -> sections; | |
659 | } | |
660 | } | |
661 | ||
662 | if (count) | |
663 | { | |
664 | /* Reallocate the target's section table including the new size. */ | |
665 | if (target -> to_sections) | |
666 | { | |
667 | old = target -> to_sections_end - target -> to_sections; | |
668 | target -> to_sections = (struct section_table *) | |
669 | xrealloc ((char *)target -> to_sections, | |
670 | (sizeof (struct section_table)) * (count + old)); | |
671 | } | |
672 | else | |
673 | { | |
674 | old = 0; | |
675 | target -> to_sections = (struct section_table *) | |
676 | xmalloc ((sizeof (struct section_table)) * count); | |
677 | } | |
678 | target -> to_sections_end = target -> to_sections + (count + old); | |
679 | ||
680 | /* Add these section table entries to the target's table. */ | |
681 | while ((so = find_solib (so)) != NULL) | |
682 | { | |
683 | if (so -> lm.o_path[0]) | |
684 | { | |
685 | count = so -> sections_end - so -> sections; | |
686 | memcpy ((char *) (target -> to_sections + old), | |
687 | so -> sections, | |
688 | (sizeof (struct section_table)) * count); | |
689 | old += count; | |
690 | } | |
691 | } | |
692 | } | |
693 | } | |
694 | } | |
695 | ||
696 | /* | |
697 | ||
698 | LOCAL FUNCTION | |
699 | ||
700 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
701 | ||
702 | SYNOPSIS | |
703 | ||
704 | static void info_sharedlibrary_command () | |
705 | ||
706 | DESCRIPTION | |
707 | ||
708 | Walk through the shared library list and print information | |
709 | about each attached library. | |
710 | */ | |
711 | ||
712 | static void | |
713 | info_sharedlibrary_command (ignore, from_tty) | |
714 | char *ignore; | |
715 | int from_tty; | |
716 | { | |
717 | register struct so_list *so = NULL; /* link map state variable */ | |
718 | int header_done = 0; | |
719 | ||
720 | if (exec_bfd == NULL) | |
721 | { | |
722 | printf_unfiltered ("No exec file.\n"); | |
723 | return; | |
724 | } | |
725 | while ((so = find_solib (so)) != NULL) | |
726 | { | |
727 | if (so -> lm.o_path[0]) | |
728 | { | |
729 | if (!header_done) | |
730 | { | |
731 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", | |
732 | "Shared Object Library"); | |
733 | header_done++; | |
734 | } | |
735 | printf_unfiltered ("%-12s", | |
736 | local_hex_string_custom ((unsigned long) LM_ADDR (so), | |
737 | "08l")); | |
738 | printf_unfiltered ("%-12s", | |
739 | local_hex_string_custom ((unsigned long) so -> lmend, | |
740 | "08l")); | |
741 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); | |
742 | printf_unfiltered ("%s\n", so -> lm.o_path); | |
743 | } | |
744 | } | |
745 | if (so_list_head == NULL) | |
746 | { | |
747 | printf_unfiltered ("No shared libraries loaded at this time.\n"); | |
748 | } | |
749 | } | |
750 | ||
751 | /* | |
752 | ||
753 | GLOBAL FUNCTION | |
754 | ||
755 | solib_address -- check to see if an address is in a shared lib | |
756 | ||
757 | SYNOPSIS | |
758 | ||
759 | int solib_address (CORE_ADDR address) | |
760 | ||
761 | DESCRIPTION | |
762 | ||
763 | Provides a hook for other gdb routines to discover whether or | |
764 | not a particular address is within the mapped address space of | |
765 | a shared library. Any address between the base mapping address | |
766 | and the first address beyond the end of the last mapping, is | |
767 | considered to be within the shared library address space, for | |
768 | our purposes. | |
769 | ||
770 | For example, this routine is called at one point to disable | |
771 | breakpoints which are in shared libraries that are not currently | |
772 | mapped in. | |
773 | */ | |
774 | ||
775 | int | |
776 | solib_address (address) | |
777 | CORE_ADDR address; | |
778 | { | |
779 | register struct so_list *so = 0; /* link map state variable */ | |
780 | ||
781 | while ((so = find_solib (so)) != NULL) | |
782 | { | |
783 | if (so -> lm.o_path[0]) | |
784 | { | |
33c66e44 | 785 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && |
a2f1e2e5 ILT |
786 | (address < (CORE_ADDR) so -> lmend)) |
787 | { | |
788 | return (1); | |
789 | } | |
790 | } | |
791 | } | |
792 | return (0); | |
793 | } | |
794 | ||
795 | /* Called by free_all_symtabs */ | |
796 | ||
797 | void | |
798 | clear_solib() | |
799 | { | |
800 | struct so_list *next; | |
801 | char *bfd_filename; | |
802 | ||
803 | while (so_list_head) | |
804 | { | |
805 | if (so_list_head -> sections) | |
806 | { | |
807 | free ((PTR)so_list_head -> sections); | |
808 | } | |
809 | if (so_list_head -> abfd) | |
810 | { | |
811 | bfd_filename = bfd_get_filename (so_list_head -> abfd); | |
812 | bfd_close (so_list_head -> abfd); | |
813 | } | |
814 | else | |
815 | /* This happens for the executable on SVR4. */ | |
816 | bfd_filename = NULL; | |
4ad0021e | 817 | |
a2f1e2e5 ILT |
818 | next = so_list_head -> next; |
819 | if (bfd_filename) | |
820 | free ((PTR)bfd_filename); | |
4ad0021e | 821 | free (so_list_head->lm.o_path); |
a2f1e2e5 ILT |
822 | free ((PTR)so_list_head); |
823 | so_list_head = next; | |
824 | } | |
825 | debug_base = 0; | |
826 | } | |
827 | ||
828 | /* | |
829 | ||
830 | LOCAL FUNCTION | |
831 | ||
832 | disable_break -- remove the "mapping changed" breakpoint | |
833 | ||
834 | SYNOPSIS | |
835 | ||
836 | static int disable_break () | |
837 | ||
838 | DESCRIPTION | |
839 | ||
840 | Removes the breakpoint that gets hit when the dynamic linker | |
841 | completes a mapping change. | |
842 | ||
843 | */ | |
844 | ||
845 | static int | |
846 | disable_break () | |
847 | { | |
848 | int status = 1; | |
849 | ||
850 | ||
851 | /* Note that breakpoint address and original contents are in our address | |
852 | space, so we just need to write the original contents back. */ | |
853 | ||
854 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
855 | { | |
856 | status = 0; | |
857 | } | |
858 | ||
859 | /* For the SVR4 version, we always know the breakpoint address. For the | |
860 | SunOS version we don't know it until the above code is executed. | |
861 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
862 | ||
863 | if (stop_pc != breakpoint_addr) | |
864 | { | |
865 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
866 | } | |
867 | ||
868 | return (status); | |
869 | } | |
870 | ||
871 | /* | |
872 | ||
873 | LOCAL FUNCTION | |
874 | ||
875 | enable_break -- arrange for dynamic linker to hit breakpoint | |
876 | ||
877 | SYNOPSIS | |
878 | ||
879 | int enable_break (void) | |
880 | ||
881 | DESCRIPTION | |
882 | ||
883 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
884 | debugger interface, support for arranging for the inferior to hit | |
885 | a breakpoint after mapping in the shared libraries. This function | |
886 | enables that breakpoint. | |
887 | ||
888 | For SunOS, there is a special flag location (in_debugger) which we | |
889 | set to 1. When the dynamic linker sees this flag set, it will set | |
890 | a breakpoint at a location known only to itself, after saving the | |
891 | original contents of that place and the breakpoint address itself, | |
892 | in it's own internal structures. When we resume the inferior, it | |
893 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
894 | We handle this (in a different place) by restoring the contents of | |
895 | the breakpointed location (which is only known after it stops), | |
896 | chasing around to locate the shared libraries that have been | |
897 | loaded, then resuming. | |
898 | ||
899 | For SVR4, the debugger interface structure contains a member (r_brk) | |
900 | which is statically initialized at the time the shared library is | |
901 | built, to the offset of a function (_r_debug_state) which is guaran- | |
902 | teed to be called once before mapping in a library, and again when | |
903 | the mapping is complete. At the time we are examining this member, | |
904 | it contains only the unrelocated offset of the function, so we have | |
905 | to do our own relocation. Later, when the dynamic linker actually | |
906 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
907 | ||
908 | The debugger interface structure also contains an enumeration which | |
909 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
910 | depending upon whether or not the library is being mapped or unmapped, | |
911 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
912 | ||
913 | Irix 5, on the other hand, has no such features. Instead, we | |
914 | set a breakpoint at main. | |
915 | */ | |
916 | ||
917 | static int | |
918 | enable_break () | |
919 | { | |
920 | int success = 0; | |
921 | struct minimal_symbol *msymbol; | |
922 | char **bkpt_namep; | |
923 | CORE_ADDR bkpt_addr; | |
924 | ||
925 | /* Scan through the list of symbols, trying to look up the symbol and | |
926 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
927 | ||
928 | breakpoint_addr = 0; | |
929 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
930 | { | |
931 | msymbol = lookup_minimal_symbol (*bkpt_namep, symfile_objfile); | |
932 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
933 | { | |
934 | bkpt_addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
935 | #ifdef SOLIB_BKPT_OFFSET | |
936 | /* We only want to skip if bkpt_addr is currently pointing | |
937 | at a GP setting instruction. */ | |
938 | { | |
939 | char buf[4]; | |
940 | ||
941 | if (target_read_memory (bkpt_addr, buf, 4) == 0) | |
942 | { | |
943 | unsigned long insn; | |
944 | ||
945 | insn = extract_unsigned_integer (buf, 4); | |
946 | if ((insn & 0xffff0000) == 0x3c1c0000) /* lui $gp,n */ | |
947 | bkpt_addr += SOLIB_BKPT_OFFSET; | |
948 | } | |
949 | } | |
950 | #endif | |
951 | if (target_insert_breakpoint (bkpt_addr, shadow_contents) == 0) | |
952 | { | |
953 | breakpoint_addr = bkpt_addr; | |
954 | success = 1; | |
955 | break; | |
956 | } | |
957 | } | |
958 | } | |
959 | ||
960 | return (success); | |
961 | } | |
962 | ||
963 | /* | |
964 | ||
965 | GLOBAL FUNCTION | |
966 | ||
967 | solib_create_inferior_hook -- shared library startup support | |
968 | ||
969 | SYNOPSIS | |
970 | ||
971 | void solib_create_inferior_hook() | |
972 | ||
973 | DESCRIPTION | |
974 | ||
975 | When gdb starts up the inferior, it nurses it along (through the | |
976 | shell) until it is ready to execute it's first instruction. At this | |
977 | point, this function gets called via expansion of the macro | |
978 | SOLIB_CREATE_INFERIOR_HOOK. | |
979 | ||
980 | For SunOS executables, this first instruction is typically the | |
981 | one at "_start", or a similar text label, regardless of whether | |
982 | the executable is statically or dynamically linked. The runtime | |
983 | startup code takes care of dynamically linking in any shared | |
984 | libraries, once gdb allows the inferior to continue. | |
985 | ||
986 | For SVR4 executables, this first instruction is either the first | |
987 | instruction in the dynamic linker (for dynamically linked | |
988 | executables) or the instruction at "start" for statically linked | |
989 | executables. For dynamically linked executables, the system | |
990 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
991 | and starts it running. The dynamic linker maps in any needed | |
992 | shared libraries, maps in the actual user executable, and then | |
993 | jumps to "start" in the user executable. | |
994 | ||
995 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
996 | can arrange to cooperate with the dynamic linker to discover the | |
997 | names of shared libraries that are dynamically linked, and the | |
998 | base addresses to which they are linked. | |
999 | ||
1000 | This function is responsible for discovering those names and | |
1001 | addresses, and saving sufficient information about them to allow | |
1002 | their symbols to be read at a later time. | |
1003 | ||
1004 | FIXME | |
1005 | ||
1006 | Between enable_break() and disable_break(), this code does not | |
1007 | properly handle hitting breakpoints which the user might have | |
1008 | set in the startup code or in the dynamic linker itself. Proper | |
1009 | handling will probably have to wait until the implementation is | |
1010 | changed to use the "breakpoint handler function" method. | |
1011 | ||
1012 | Also, what if child has exit()ed? Must exit loop somehow. | |
1013 | */ | |
1014 | ||
1015 | void | |
1016 | solib_create_inferior_hook() | |
1017 | { | |
1018 | if (!enable_break ()) | |
1019 | { | |
1020 | warning ("shared library handler failed to enable breakpoint"); | |
1021 | return; | |
1022 | } | |
1023 | ||
1024 | /* Now run the target. It will eventually hit the breakpoint, at | |
1025 | which point all of the libraries will have been mapped in and we | |
1026 | can go groveling around in the dynamic linker structures to find | |
1027 | out what we need to know about them. */ | |
1028 | ||
1029 | clear_proceed_status (); | |
1030 | stop_soon_quietly = 1; | |
1031 | stop_signal = 0; | |
1032 | do | |
1033 | { | |
1034 | target_resume (-1, 0, stop_signal); | |
1035 | wait_for_inferior (); | |
1036 | } | |
1037 | while (stop_signal != SIGTRAP); | |
1038 | stop_soon_quietly = 0; | |
1039 | ||
1040 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1041 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1042 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1043 | add any shared libraries that were mapped in. */ | |
1044 | ||
1045 | if (DECR_PC_AFTER_BREAK) | |
1046 | { | |
1047 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1048 | write_register (PC_REGNUM, stop_pc); | |
1049 | } | |
1050 | ||
1051 | if (!disable_break ()) | |
1052 | { | |
1053 | warning ("shared library handler failed to disable breakpoint"); | |
1054 | } | |
1055 | ||
1056 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | ||
1061 | LOCAL FUNCTION | |
1062 | ||
1063 | sharedlibrary_command -- handle command to explicitly add library | |
1064 | ||
1065 | SYNOPSIS | |
1066 | ||
1067 | static void sharedlibrary_command (char *args, int from_tty) | |
1068 | ||
1069 | DESCRIPTION | |
1070 | ||
1071 | */ | |
1072 | ||
1073 | static void | |
1074 | sharedlibrary_command (args, from_tty) | |
1075 | char *args; | |
1076 | int from_tty; | |
1077 | { | |
1078 | dont_repeat (); | |
1079 | solib_add (args, from_tty, (struct target_ops *) 0); | |
1080 | } | |
1081 | ||
1082 | void | |
1083 | _initialize_solib() | |
1084 | { | |
1085 | ||
1086 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
1087 | "Load shared object library symbols for files matching REGEXP."); | |
1088 | add_info ("sharedlibrary", info_sharedlibrary_command, | |
1089 | "Status of loaded shared object libraries."); | |
1090 | } |