1 /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
2 Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 #define _SYSCALL32 /* for Sparc64 cross Sparc32 */
26 #include <sys/types.h>
28 #include "gdb_string.h"
29 #include <sys/param.h>
32 #ifndef SVR4_SHARED_LIBS
33 /* SunOS shared libs need the nlist structure. */
36 #include "elf/external.h"
51 #include "gdb_regex.h"
58 #include "solib-svr4.h"
60 /* Link map info to include in an allocated so_list entry */
64 /* Pointer to copy of link map from inferior. The type is char *
65 rather than void *, so that we may use byte offsets to find the
66 various fields without the need for a cast. */
70 /* On SVR4 systems, a list of symbols in the dynamic linker where
71 GDB can try to place a breakpoint to monitor shared library
74 If none of these symbols are found, or other errors occur, then
75 SVR4 systems will fall back to using a symbol as the "startup
76 mapping complete" breakpoint address. */
78 #ifdef SVR4_SHARED_LIBS
79 static char *solib_break_names
[] =
89 #define BKPT_AT_SYMBOL 1
91 #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS)
92 static char *bkpt_names
[] =
94 #ifdef SOLIB_BKPT_NAME
95 SOLIB_BKPT_NAME
, /* Prefer configured name if it exists. */
103 /* Symbols which are used to locate the base of the link map structures. */
105 #ifndef SVR4_SHARED_LIBS
106 static char *debug_base_symbols
[] =
114 static char *main_name_list
[] =
121 /* Fetch (and possibly build) an appropriate link_map_offsets structure
122 for native targets using struct definitions from link.h. */
124 struct link_map_offsets
*
125 default_svr4_fetch_link_map_offsets (void)
128 static struct link_map_offsets lmo
;
129 static struct link_map_offsets
*lmp
= 0;
130 #if defined (HAVE_STRUCT_LINK_MAP32)
131 static struct link_map_offsets lmo32
;
132 static struct link_map_offsets
*lmp32
= 0;
136 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
138 #define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER))
144 #ifdef SVR4_SHARED_LIBS
145 lmo
.r_debug_size
= sizeof (struct r_debug
);
147 lmo
.r_map_offset
= offsetof (struct r_debug
, r_map
);
148 lmo
.r_map_size
= fieldsize (struct r_debug
, r_map
);
150 lmo
.link_map_size
= sizeof (struct link_map
);
152 lmo
.l_addr_offset
= offsetof (struct link_map
, l_addr
);
153 lmo
.l_addr_size
= fieldsize (struct link_map
, l_addr
);
155 lmo
.l_next_offset
= offsetof (struct link_map
, l_next
);
156 lmo
.l_next_size
= fieldsize (struct link_map
, l_next
);
158 lmo
.l_prev_offset
= offsetof (struct link_map
, l_prev
);
159 lmo
.l_prev_size
= fieldsize (struct link_map
, l_prev
);
161 lmo
.l_name_offset
= offsetof (struct link_map
, l_name
);
162 lmo
.l_name_size
= fieldsize (struct link_map
, l_name
);
163 #else /* !SVR4_SHARED_LIBS */
164 lmo
.link_map_size
= sizeof (struct link_map
);
166 lmo
.l_addr_offset
= offsetof (struct link_map
, lm_addr
);
167 lmo
.l_addr_size
= fieldsize (struct link_map
, lm_addr
);
169 lmo
.l_next_offset
= offsetof (struct link_map
, lm_next
);
170 lmo
.l_next_size
= fieldsize (struct link_map
, lm_next
);
172 lmo
.l_name_offset
= offsetof (struct link_map
, lm_name
);
173 lmo
.l_name_size
= fieldsize (struct link_map
, lm_name
);
174 #endif /* SVR4_SHARED_LIBS */
177 #if defined (HAVE_STRUCT_LINK_MAP32)
182 lmo32
.r_debug_size
= sizeof (struct r_debug32
);
184 lmo32
.r_map_offset
= offsetof (struct r_debug32
, r_map
);
185 lmo32
.r_map_size
= fieldsize (struct r_debug32
, r_map
);
187 lmo32
.link_map_size
= sizeof (struct link_map32
);
189 lmo32
.l_addr_offset
= offsetof (struct link_map32
, l_addr
);
190 lmo32
.l_addr_size
= fieldsize (struct link_map32
, l_addr
);
192 lmo32
.l_next_offset
= offsetof (struct link_map32
, l_next
);
193 lmo32
.l_next_size
= fieldsize (struct link_map32
, l_next
);
195 lmo32
.l_prev_offset
= offsetof (struct link_map32
, l_prev
);
196 lmo32
.l_prev_size
= fieldsize (struct link_map32
, l_prev
);
198 lmo32
.l_name_offset
= offsetof (struct link_map32
, l_name
);
199 lmo32
.l_name_size
= fieldsize (struct link_map32
, l_name
);
201 #endif /* defined (HAVE_STRUCT_LINK_MAP32) */
203 #if defined (HAVE_STRUCT_LINK_MAP32)
204 if (bfd_get_arch_size (exec_bfd
) == 32)
212 internal_error ("default_svr4_fetch_link_map_offsets called without HAVE_LINK_H defined.");
215 #endif /* HAVE_LINK_H */
218 /* Macro to extract an address from a solib structure.
219 When GDB is configured for some 32-bit targets (e.g. Solaris 2.7
220 sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is
221 64 bits. We have to extract only the significant bits of addresses
222 to get the right address when accessing the core file BFD. */
224 #define SOLIB_EXTRACT_ADDRESS(MEMBER) \
225 extract_address (&(MEMBER), sizeof (MEMBER))
227 /* local data declarations */
229 #ifndef SVR4_SHARED_LIBS
231 /* NOTE: converted the macros LM_ADDR, LM_NEXT, LM_NAME and
232 IGNORE_FIRST_LINK_MAP_ENTRY into functions (see below).
235 static struct link_dynamic dynamic_copy
;
236 static struct link_dynamic_2 ld_2_copy
;
237 static struct ld_debug debug_copy
;
238 static CORE_ADDR debug_addr
;
239 static CORE_ADDR flag_addr
;
241 #endif /* !SVR4_SHARED_LIBS */
243 /* link map access functions */
246 LM_ADDR (struct so_list
*so
)
248 struct link_map_offsets
*lmo
= SVR4_FETCH_LINK_MAP_OFFSETS ();
250 return extract_address (so
->lm_info
->lm
+ lmo
->l_addr_offset
, lmo
->l_addr_size
);
254 LM_NEXT (struct so_list
*so
)
256 struct link_map_offsets
*lmo
= SVR4_FETCH_LINK_MAP_OFFSETS ();
258 return extract_address (so
->lm_info
->lm
+ lmo
->l_next_offset
, lmo
->l_next_size
);
262 LM_NAME (struct so_list
*so
)
264 struct link_map_offsets
*lmo
= SVR4_FETCH_LINK_MAP_OFFSETS ();
266 return extract_address (so
->lm_info
->lm
+ lmo
->l_name_offset
, lmo
->l_name_size
);
269 #ifndef SVR4_SHARED_LIBS
272 IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list
*so
)
277 #else /* SVR4_SHARED_LIBS */
280 IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list
*so
)
282 struct link_map_offsets
*lmo
= SVR4_FETCH_LINK_MAP_OFFSETS ();
284 return extract_address (so
->lm_info
->lm
+ lmo
->l_prev_offset
,
285 lmo
->l_prev_size
) == 0;
288 #endif /* !SVR4_SHARED_LIBS */
290 static CORE_ADDR debug_base
; /* Base of dynamic linker structures */
291 static CORE_ADDR breakpoint_addr
; /* Address where end bkpt is set */
293 /* Local function prototypes */
295 static int match_main (char *);
297 #ifndef SVR4_SHARED_LIBS
299 /* Allocate the runtime common object file. */
302 allocate_rt_common_objfile (void)
304 struct objfile
*objfile
;
305 struct objfile
*last_one
;
307 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
308 memset (objfile
, 0, sizeof (struct objfile
));
310 obstack_specify_allocation (&objfile
->psymbol_cache
.cache
, 0, 0,
312 obstack_specify_allocation (&objfile
->psymbol_obstack
, 0, 0, xmalloc
,
314 obstack_specify_allocation (&objfile
->symbol_obstack
, 0, 0, xmalloc
,
316 obstack_specify_allocation (&objfile
->type_obstack
, 0, 0, xmalloc
,
318 objfile
->name
= mstrsave (objfile
->md
, "rt_common");
320 /* Add this file onto the tail of the linked list of other such files. */
322 objfile
->next
= NULL
;
323 if (object_files
== NULL
)
324 object_files
= objfile
;
327 for (last_one
= object_files
;
329 last_one
= last_one
->next
);
330 last_one
->next
= objfile
;
333 rt_common_objfile
= objfile
;
336 /* Read all dynamically loaded common symbol definitions from the inferior
337 and put them into the minimal symbol table for the runtime common
341 solib_add_common_symbols (CORE_ADDR rtc_symp
)
343 struct rtc_symb inferior_rtc_symb
;
344 struct nlist inferior_rtc_nlist
;
348 /* Remove any runtime common symbols from previous runs. */
350 if (rt_common_objfile
!= NULL
&& rt_common_objfile
->minimal_symbol_count
)
352 obstack_free (&rt_common_objfile
->symbol_obstack
, 0);
353 obstack_specify_allocation (&rt_common_objfile
->symbol_obstack
, 0, 0,
355 rt_common_objfile
->minimal_symbol_count
= 0;
356 rt_common_objfile
->msymbols
= NULL
;
359 init_minimal_symbol_collection ();
360 make_cleanup_discard_minimal_symbols ();
364 read_memory (rtc_symp
,
365 (char *) &inferior_rtc_symb
,
366 sizeof (inferior_rtc_symb
));
367 read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb
.rtc_sp
),
368 (char *) &inferior_rtc_nlist
,
369 sizeof (inferior_rtc_nlist
));
370 if (inferior_rtc_nlist
.n_type
== N_COMM
)
372 /* FIXME: The length of the symbol name is not available, but in the
373 current implementation the common symbol is allocated immediately
374 behind the name of the symbol. */
375 len
= inferior_rtc_nlist
.n_value
- inferior_rtc_nlist
.n_un
.n_strx
;
377 name
= xmalloc (len
);
378 read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist
.n_un
.n_name
),
381 /* Allocate the runtime common objfile if necessary. */
382 if (rt_common_objfile
== NULL
)
383 allocate_rt_common_objfile ();
385 prim_record_minimal_symbol (name
, inferior_rtc_nlist
.n_value
,
386 mst_bss
, rt_common_objfile
);
389 rtc_symp
= SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb
.rtc_next
);
392 /* Install any minimal symbols that have been collected as the current
393 minimal symbols for the runtime common objfile. */
395 install_minimal_symbols (rt_common_objfile
);
398 #endif /* SVR4_SHARED_LIBS */
401 #ifdef SVR4_SHARED_LIBS
403 static CORE_ADDR
bfd_lookup_symbol (bfd
*, char *);
409 bfd_lookup_symbol -- lookup the value for a specific symbol
413 CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
417 An expensive way to lookup the value of a single symbol for
418 bfd's that are only temporary anyway. This is used by the
419 shared library support to find the address of the debugger
420 interface structures in the shared library.
422 Note that 0 is specifically allowed as an error return (no
427 bfd_lookup_symbol (bfd
*abfd
, char *symname
)
429 unsigned int storage_needed
;
431 asymbol
**symbol_table
;
432 unsigned int number_of_symbols
;
434 struct cleanup
*back_to
;
435 CORE_ADDR symaddr
= 0;
437 storage_needed
= bfd_get_symtab_upper_bound (abfd
);
439 if (storage_needed
> 0)
441 symbol_table
= (asymbol
**) xmalloc (storage_needed
);
442 back_to
= make_cleanup (xfree
, (PTR
) symbol_table
);
443 number_of_symbols
= bfd_canonicalize_symtab (abfd
, symbol_table
);
445 for (i
= 0; i
< number_of_symbols
; i
++)
447 sym
= *symbol_table
++;
448 if (STREQ (sym
->name
, symname
))
450 /* Bfd symbols are section relative. */
451 symaddr
= sym
->value
+ sym
->section
->vma
;
455 do_cleanups (back_to
);
461 /* On FreeBSD, the dynamic linker is stripped by default. So we'll
462 have to check the dynamic string table too. */
464 storage_needed
= bfd_get_dynamic_symtab_upper_bound (abfd
);
466 if (storage_needed
> 0)
468 symbol_table
= (asymbol
**) xmalloc (storage_needed
);
469 back_to
= make_cleanup (xfree
, (PTR
) symbol_table
);
470 number_of_symbols
= bfd_canonicalize_dynamic_symtab (abfd
, symbol_table
);
472 for (i
= 0; i
< number_of_symbols
; i
++)
474 sym
= *symbol_table
++;
475 if (STREQ (sym
->name
, symname
))
477 /* Bfd symbols are section relative. */
478 symaddr
= sym
->value
+ sym
->section
->vma
;
482 do_cleanups (back_to
);
488 #ifdef HANDLE_SVR4_EXEC_EMULATORS
491 Solaris BCP (the part of Solaris which allows it to run SunOS4
492 a.out files) throws in another wrinkle. Solaris does not fill
493 in the usual a.out link map structures when running BCP programs,
494 the only way to get at them is via groping around in the dynamic
496 The dynamic linker and it's structures are located in the shared
497 C library, which gets run as the executable's "interpreter" by
500 Note that we can assume nothing about the process state at the time
501 we need to find these structures. We may be stopped on the first
502 instruction of the interpreter (C shared library), the first
503 instruction of the executable itself, or somewhere else entirely
504 (if we attached to the process for example).
507 static char *debug_base_symbols
[] =
509 "r_debug", /* Solaris 2.3 */
510 "_r_debug", /* Solaris 2.1, 2.2 */
514 static int look_for_base (int, CORE_ADDR
);
520 look_for_base -- examine file for each mapped address segment
524 static int look_for_base (int fd, CORE_ADDR baseaddr)
528 This function is passed to proc_iterate_over_mappings, which
529 causes it to get called once for each mapped address space, with
530 an open file descriptor for the file mapped to that space, and the
531 base address of that mapped space.
533 Our job is to find the debug base symbol in the file that this
534 fd is open on, if it exists, and if so, initialize the dynamic
535 linker structure base address debug_base.
537 Note that this is a computationally expensive proposition, since
538 we basically have to open a bfd on every call, so we specifically
539 avoid opening the exec file.
543 look_for_base (int fd
, CORE_ADDR baseaddr
)
546 CORE_ADDR address
= 0;
549 /* If the fd is -1, then there is no file that corresponds to this
550 mapped memory segment, so skip it. Also, if the fd corresponds
551 to the exec file, skip it as well. */
555 && fdmatch (fileno ((FILE *) (exec_bfd
->iostream
)), fd
)))
560 /* Try to open whatever random file this fd corresponds to. Note that
561 we have no way currently to find the filename. Don't gripe about
562 any problems we might have, just fail. */
564 if ((interp_bfd
= bfd_fdopenr ("unnamed", gnutarget
, fd
)) == NULL
)
568 if (!bfd_check_format (interp_bfd
, bfd_object
))
570 /* FIXME-leak: on failure, might not free all memory associated with
572 bfd_close (interp_bfd
);
576 /* Now try to find our debug base symbol in this file, which we at
577 least know to be a valid ELF executable or shared library. */
579 for (symbolp
= debug_base_symbols
; *symbolp
!= NULL
; symbolp
++)
581 address
= bfd_lookup_symbol (interp_bfd
, *symbolp
);
589 /* FIXME-leak: on failure, might not free all memory associated with
591 bfd_close (interp_bfd
);
595 /* Eureka! We found the symbol. But now we may need to relocate it
596 by the base address. If the symbol's value is less than the base
597 address of the shared library, then it hasn't yet been relocated
598 by the dynamic linker, and we have to do it ourself. FIXME: Note
599 that we make the assumption that the first segment that corresponds
600 to the shared library has the base address to which the library
603 if (address
< baseaddr
)
607 debug_base
= address
;
608 /* FIXME-leak: on failure, might not free all memory associated with
610 bfd_close (interp_bfd
);
613 #endif /* HANDLE_SVR4_EXEC_EMULATORS */
619 elf_locate_base -- locate the base address of dynamic linker structs
620 for SVR4 elf targets.
624 CORE_ADDR elf_locate_base (void)
628 For SVR4 elf targets the address of the dynamic linker's runtime
629 structure is contained within the dynamic info section in the
630 executable file. The dynamic section is also mapped into the
631 inferior address space. Because the runtime loader fills in the
632 real address before starting the inferior, we have to read in the
633 dynamic info section from the inferior address space.
634 If there are any errors while trying to find the address, we
635 silently return 0, otherwise the found address is returned.
640 elf_locate_base (void)
642 sec_ptr dyninfo_sect
;
643 int dyninfo_sect_size
;
644 CORE_ADDR dyninfo_addr
;
649 /* Find the start address of the .dynamic section. */
650 dyninfo_sect
= bfd_get_section_by_name (exec_bfd
, ".dynamic");
651 if (dyninfo_sect
== NULL
)
653 dyninfo_addr
= bfd_section_vma (exec_bfd
, dyninfo_sect
);
655 /* Read in .dynamic section, silently ignore errors. */
656 dyninfo_sect_size
= bfd_section_size (exec_bfd
, dyninfo_sect
);
657 buf
= alloca (dyninfo_sect_size
);
658 if (target_read_memory (dyninfo_addr
, buf
, dyninfo_sect_size
))
661 /* Find the DT_DEBUG entry in the the .dynamic section.
662 For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has
663 no DT_DEBUG entries. */
665 arch_size
= bfd_get_arch_size (exec_bfd
);
666 if (arch_size
== -1) /* failure */
671 for (bufend
= buf
+ dyninfo_sect_size
;
673 buf
+= sizeof (Elf32_External_Dyn
))
675 Elf32_External_Dyn
*x_dynp
= (Elf32_External_Dyn
*) buf
;
679 dyn_tag
= bfd_h_get_32 (exec_bfd
, (bfd_byte
*) x_dynp
->d_tag
);
680 if (dyn_tag
== DT_NULL
)
682 else if (dyn_tag
== DT_DEBUG
)
684 dyn_ptr
= bfd_h_get_32 (exec_bfd
,
685 (bfd_byte
*) x_dynp
->d_un
.d_ptr
);
688 #ifdef DT_MIPS_RLD_MAP
689 else if (dyn_tag
== DT_MIPS_RLD_MAP
)
693 pbuf
= alloca (TARGET_PTR_BIT
/ HOST_CHAR_BIT
);
694 /* DT_MIPS_RLD_MAP contains a pointer to the address
695 of the dynamic link structure. */
696 dyn_ptr
= bfd_h_get_32 (exec_bfd
,
697 (bfd_byte
*) x_dynp
->d_un
.d_ptr
);
698 if (target_read_memory (dyn_ptr
, pbuf
, sizeof (pbuf
)))
700 return extract_unsigned_integer (pbuf
, sizeof (pbuf
));
705 else /* 64-bit elf */
707 for (bufend
= buf
+ dyninfo_sect_size
;
709 buf
+= sizeof (Elf64_External_Dyn
))
711 Elf64_External_Dyn
*x_dynp
= (Elf64_External_Dyn
*) buf
;
715 dyn_tag
= bfd_h_get_64 (exec_bfd
, (bfd_byte
*) x_dynp
->d_tag
);
716 if (dyn_tag
== DT_NULL
)
718 else if (dyn_tag
== DT_DEBUG
)
720 dyn_ptr
= bfd_h_get_64 (exec_bfd
,
721 (bfd_byte
*) x_dynp
->d_un
.d_ptr
);
727 /* DT_DEBUG entry not found. */
731 #endif /* SVR4_SHARED_LIBS */
737 locate_base -- locate the base address of dynamic linker structs
741 CORE_ADDR locate_base (void)
745 For both the SunOS and SVR4 shared library implementations, if the
746 inferior executable has been linked dynamically, there is a single
747 address somewhere in the inferior's data space which is the key to
748 locating all of the dynamic linker's runtime structures. This
749 address is the value of the debug base symbol. The job of this
750 function is to find and return that address, or to return 0 if there
751 is no such address (the executable is statically linked for example).
753 For SunOS, the job is almost trivial, since the dynamic linker and
754 all of it's structures are statically linked to the executable at
755 link time. Thus the symbol for the address we are looking for has
756 already been added to the minimal symbol table for the executable's
757 objfile at the time the symbol file's symbols were read, and all we
758 have to do is look it up there. Note that we explicitly do NOT want
759 to find the copies in the shared library.
761 The SVR4 version is a bit more complicated because the address
762 is contained somewhere in the dynamic info section. We have to go
763 to a lot more work to discover the address of the debug base symbol.
764 Because of this complexity, we cache the value we find and return that
765 value on subsequent invocations. Note there is no copy in the
766 executable symbol tables.
774 #ifndef SVR4_SHARED_LIBS
776 struct minimal_symbol
*msymbol
;
777 CORE_ADDR address
= 0;
780 /* For SunOS, we want to limit the search for the debug base symbol to the
781 executable being debugged, since there is a duplicate named symbol in the
782 shared library. We don't want the shared library versions. */
784 for (symbolp
= debug_base_symbols
; *symbolp
!= NULL
; symbolp
++)
786 msymbol
= lookup_minimal_symbol (*symbolp
, NULL
, symfile_objfile
);
787 if ((msymbol
!= NULL
) && (SYMBOL_VALUE_ADDRESS (msymbol
) != 0))
789 address
= SYMBOL_VALUE_ADDRESS (msymbol
);
795 #else /* SVR4_SHARED_LIBS */
797 /* Check to see if we have a currently valid address, and if so, avoid
798 doing all this work again and just return the cached address. If
799 we have no cached address, try to locate it in the dynamic info
800 section for ELF executables. */
805 && bfd_get_flavour (exec_bfd
) == bfd_target_elf_flavour
)
806 debug_base
= elf_locate_base ();
807 #ifdef HANDLE_SVR4_EXEC_EMULATORS
808 /* Try it the hard way for emulated executables. */
809 else if (inferior_pid
!= 0 && target_has_execution
)
810 proc_iterate_over_mappings (look_for_base
);
815 #endif /* !SVR4_SHARED_LIBS */
823 first_link_map_member -- locate first member in dynamic linker's map
827 static CORE_ADDR first_link_map_member (void)
831 Find the first element in the inferior's dynamic link map, and
832 return its address in the inferior. This function doesn't copy the
833 link map entry itself into our address space; current_sos actually
837 first_link_map_member (void)
841 #ifndef SVR4_SHARED_LIBS
843 read_memory (debug_base
, (char *) &dynamic_copy
, sizeof (dynamic_copy
));
844 if (dynamic_copy
.ld_version
>= 2)
846 /* It is a version that we can deal with, so read in the secondary
847 structure and find the address of the link map list from it. */
848 read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy
.ld_un
.ld_2
),
849 (char *) &ld_2_copy
, sizeof (struct link_dynamic_2
));
850 lm
= SOLIB_EXTRACT_ADDRESS (ld_2_copy
.ld_loaded
);
853 #else /* SVR4_SHARED_LIBS */
854 struct link_map_offsets
*lmo
= SVR4_FETCH_LINK_MAP_OFFSETS ();
855 char *r_map_buf
= xmalloc (lmo
->r_map_size
);
856 struct cleanup
*cleanups
= make_cleanup (xfree
, r_map_buf
);
858 read_memory (debug_base
+ lmo
->r_map_offset
, r_map_buf
, lmo
->r_map_size
);
860 lm
= extract_address (r_map_buf
, lmo
->r_map_size
);
862 /* FIXME: Perhaps we should validate the info somehow, perhaps by
863 checking r_version for a known version number, or r_state for
866 do_cleanups (cleanups
);
868 #endif /* !SVR4_SHARED_LIBS */
873 #ifdef SVR4_SHARED_LIBS
878 open_symbol_file_object
882 void open_symbol_file_object (void *from_tty)
886 If no open symbol file, attempt to locate and open the main symbol
887 file. On SVR4 systems, this is the first link map entry. If its
888 name is here, we can open it. Useful when attaching to a process
889 without first loading its symbol file.
891 If FROM_TTYP dereferences to a non-zero integer, allow messages to
892 be printed. This parameter is a pointer rather than an int because
893 open_symbol_file_object() is called via catch_errors() and
894 catch_errors() requires a pointer argument. */
897 open_symbol_file_object (void *from_ttyp
)
899 CORE_ADDR lm
, l_name
;
902 int from_tty
= *(int *)from_ttyp
;
903 struct link_map_offsets
*lmo
= SVR4_FETCH_LINK_MAP_OFFSETS ();
904 char *l_name_buf
= xmalloc (lmo
->l_name_size
);
905 struct cleanup
*cleanups
= make_cleanup (xfree
, l_name_buf
);
908 if (!query ("Attempt to reload symbols from process? "))
911 if ((debug_base
= locate_base ()) == 0)
912 return 0; /* failed somehow... */
914 /* First link map member should be the executable. */
915 if ((lm
= first_link_map_member ()) == 0)
916 return 0; /* failed somehow... */
918 /* Read address of name from target memory to GDB. */
919 read_memory (lm
+ lmo
->l_name_offset
, l_name_buf
, lmo
->l_name_size
);
921 /* Convert the address to host format. */
922 l_name
= extract_address (l_name_buf
, lmo
->l_name_size
);
924 /* Free l_name_buf. */
925 do_cleanups (cleanups
);
928 return 0; /* No filename. */
930 /* Now fetch the filename from target memory. */
931 target_read_string (l_name
, &filename
, SO_NAME_MAX_PATH_SIZE
- 1, &errcode
);
935 warning ("failed to read exec filename from attached file: %s",
936 safe_strerror (errcode
));
940 make_cleanup (xfree
, filename
);
941 /* Have a pathname: read the symbol file. */
942 symbol_file_command (filename
, from_tty
);
949 open_symbol_file_object (int *from_ttyp
)
954 #endif /* SVR4_SHARED_LIBS */
959 current_sos -- build a list of currently loaded shared objects
963 struct so_list *current_sos ()
967 Build a list of `struct so_list' objects describing the shared
968 objects currently loaded in the inferior. This list does not
969 include an entry for the main executable file.
971 Note that we only gather information directly available from the
972 inferior --- we don't examine any of the shared library files
973 themselves. The declaration of `struct so_list' says which fields
974 we provide values for. */
976 static struct so_list
*
977 svr4_current_sos (void)
980 struct so_list
*head
= 0;
981 struct so_list
**link_ptr
= &head
;
983 /* Make sure we've looked up the inferior's dynamic linker's base
987 debug_base
= locate_base ();
989 /* If we can't find the dynamic linker's base structure, this
990 must not be a dynamically linked executable. Hmm. */
995 /* Walk the inferior's link map list, and build our list of
996 `struct so_list' nodes. */
997 lm
= first_link_map_member ();
1000 struct link_map_offsets
*lmo
= SVR4_FETCH_LINK_MAP_OFFSETS ();
1002 = (struct so_list
*) xmalloc (sizeof (struct so_list
));
1003 struct cleanup
*old_chain
= make_cleanup (xfree
, new);
1005 memset (new, 0, sizeof (*new));
1007 new->lm_info
= xmalloc (sizeof (struct lm_info
));
1008 make_cleanup (xfree
, new->lm_info
);
1010 new->lm_info
->lm
= xmalloc (lmo
->link_map_size
);
1011 make_cleanup (xfree
, new->lm_info
->lm
);
1012 memset (new->lm_info
->lm
, 0, lmo
->link_map_size
);
1014 read_memory (lm
, new->lm_info
->lm
, lmo
->link_map_size
);
1018 /* For SVR4 versions, the first entry in the link map is for the
1019 inferior executable, so we must ignore it. For some versions of
1020 SVR4, it has no name. For others (Solaris 2.3 for example), it
1021 does have a name, so we can no longer use a missing name to
1022 decide when to ignore it. */
1023 if (IGNORE_FIRST_LINK_MAP_ENTRY (new))
1030 /* Extract this shared object's name. */
1031 target_read_string (LM_NAME (new), &buffer
,
1032 SO_NAME_MAX_PATH_SIZE
- 1, &errcode
);
1035 warning ("current_sos: Can't read pathname for load map: %s\n",
1036 safe_strerror (errcode
));
1040 strncpy (new->so_name
, buffer
, SO_NAME_MAX_PATH_SIZE
- 1);
1041 new->so_name
[SO_NAME_MAX_PATH_SIZE
- 1] = '\0';
1043 strcpy (new->so_original_name
, new->so_name
);
1046 /* If this entry has no name, or its name matches the name
1047 for the main executable, don't include it in the list. */
1048 if (! new->so_name
[0]
1049 || match_main (new->so_name
))
1055 link_ptr
= &new->next
;
1059 discard_cleanups (old_chain
);
1066 /* On some systems, the only way to recognize the link map entry for
1067 the main executable file is by looking at its name. Return
1068 non-zero iff SONAME matches one of the known main executable names. */
1071 match_main (char *soname
)
1075 for (mainp
= main_name_list
; *mainp
!= NULL
; mainp
++)
1077 if (strcmp (soname
, *mainp
) == 0)
1085 #ifdef SVR4_SHARED_LIBS
1087 /* Return 1 if PC lies in the dynamic symbol resolution code of the
1088 SVR4 run time loader. */
1090 static CORE_ADDR interp_text_sect_low
;
1091 static CORE_ADDR interp_text_sect_high
;
1092 static CORE_ADDR interp_plt_sect_low
;
1093 static CORE_ADDR interp_plt_sect_high
;
1096 in_svr4_dynsym_resolve_code (CORE_ADDR pc
)
1098 return ((pc
>= interp_text_sect_low
&& pc
< interp_text_sect_high
)
1099 || (pc
>= interp_plt_sect_low
&& pc
< interp_plt_sect_high
)
1100 || in_plt_section (pc
, NULL
));
1108 disable_break -- remove the "mapping changed" breakpoint
1112 static int disable_break ()
1116 Removes the breakpoint that gets hit when the dynamic linker
1117 completes a mapping change.
1121 #ifndef SVR4_SHARED_LIBS
1124 disable_break (void)
1128 int in_debugger
= 0;
1130 /* Read the debugger structure from the inferior to retrieve the
1131 address of the breakpoint and the original contents of the
1132 breakpoint address. Remove the breakpoint by writing the original
1135 read_memory (debug_addr
, (char *) &debug_copy
, sizeof (debug_copy
));
1137 /* Set `in_debugger' to zero now. */
1139 write_memory (flag_addr
, (char *) &in_debugger
, sizeof (in_debugger
));
1141 breakpoint_addr
= SOLIB_EXTRACT_ADDRESS (debug_copy
.ldd_bp_addr
);
1142 write_memory (breakpoint_addr
, (char *) &debug_copy
.ldd_bp_inst
,
1143 sizeof (debug_copy
.ldd_bp_inst
));
1145 /* For the SVR4 version, we always know the breakpoint address. For the
1146 SunOS version we don't know it until the above code is executed.
1147 Grumble if we are stopped anywhere besides the breakpoint address. */
1149 if (stop_pc
!= breakpoint_addr
)
1151 warning ("stopped at unknown breakpoint while handling shared libraries");
1157 #endif /* #ifdef SVR4_SHARED_LIBS */
1163 enable_break -- arrange for dynamic linker to hit breakpoint
1167 int enable_break (void)
1171 Both the SunOS and the SVR4 dynamic linkers have, as part of their
1172 debugger interface, support for arranging for the inferior to hit
1173 a breakpoint after mapping in the shared libraries. This function
1174 enables that breakpoint.
1176 For SunOS, there is a special flag location (in_debugger) which we
1177 set to 1. When the dynamic linker sees this flag set, it will set
1178 a breakpoint at a location known only to itself, after saving the
1179 original contents of that place and the breakpoint address itself,
1180 in it's own internal structures. When we resume the inferior, it
1181 will eventually take a SIGTRAP when it runs into the breakpoint.
1182 We handle this (in a different place) by restoring the contents of
1183 the breakpointed location (which is only known after it stops),
1184 chasing around to locate the shared libraries that have been
1185 loaded, then resuming.
1187 For SVR4, the debugger interface structure contains a member (r_brk)
1188 which is statically initialized at the time the shared library is
1189 built, to the offset of a function (_r_debug_state) which is guaran-
1190 teed to be called once before mapping in a library, and again when
1191 the mapping is complete. At the time we are examining this member,
1192 it contains only the unrelocated offset of the function, so we have
1193 to do our own relocation. Later, when the dynamic linker actually
1194 runs, it relocates r_brk to be the actual address of _r_debug_state().
1196 The debugger interface structure also contains an enumeration which
1197 is set to either RT_ADD or RT_DELETE prior to changing the mapping,
1198 depending upon whether or not the library is being mapped or unmapped,
1199 and then set to RT_CONSISTENT after the library is mapped/unmapped.
1207 #ifndef SVR4_SHARED_LIBS
1212 /* Get link_dynamic structure */
1214 j
= target_read_memory (debug_base
, (char *) &dynamic_copy
,
1215 sizeof (dynamic_copy
));
1222 /* Calc address of debugger interface structure */
1224 debug_addr
= SOLIB_EXTRACT_ADDRESS (dynamic_copy
.ldd
);
1226 /* Calc address of `in_debugger' member of debugger interface structure */
1228 flag_addr
= debug_addr
+ (CORE_ADDR
) ((char *) &debug_copy
.ldd_in_debugger
-
1229 (char *) &debug_copy
);
1231 /* Write a value of 1 to this member. */
1234 write_memory (flag_addr
, (char *) &in_debugger
, sizeof (in_debugger
));
1237 #else /* SVR4_SHARED_LIBS */
1239 #ifdef BKPT_AT_SYMBOL
1241 struct minimal_symbol
*msymbol
;
1243 asection
*interp_sect
;
1245 /* First, remove all the solib event breakpoints. Their addresses
1246 may have changed since the last time we ran the program. */
1247 remove_solib_event_breakpoints ();
1249 #ifdef SVR4_SHARED_LIBS
1250 interp_text_sect_low
= interp_text_sect_high
= 0;
1251 interp_plt_sect_low
= interp_plt_sect_high
= 0;
1253 /* Find the .interp section; if not found, warn the user and drop
1254 into the old breakpoint at symbol code. */
1255 interp_sect
= bfd_get_section_by_name (exec_bfd
, ".interp");
1258 unsigned int interp_sect_size
;
1260 CORE_ADDR load_addr
;
1261 bfd
*tmp_bfd
= NULL
;
1263 char *tmp_pathname
= NULL
;
1264 CORE_ADDR sym_addr
= 0;
1266 /* Read the contents of the .interp section into a local buffer;
1267 the contents specify the dynamic linker this program uses. */
1268 interp_sect_size
= bfd_section_size (exec_bfd
, interp_sect
);
1269 buf
= alloca (interp_sect_size
);
1270 bfd_get_section_contents (exec_bfd
, interp_sect
,
1271 buf
, 0, interp_sect_size
);
1273 /* Now we need to figure out where the dynamic linker was
1274 loaded so that we can load its symbols and place a breakpoint
1275 in the dynamic linker itself.
1277 This address is stored on the stack. However, I've been unable
1278 to find any magic formula to find it for Solaris (appears to
1279 be trivial on GNU/Linux). Therefore, we have to try an alternate
1280 mechanism to find the dynamic linker's base address. */
1282 tmp_fd
= solib_open (buf
, &tmp_pathname
);
1284 tmp_bfd
= bfd_fdopenr (tmp_pathname
, gnutarget
, tmp_fd
);
1286 if (tmp_bfd
== NULL
)
1287 goto bkpt_at_symbol
;
1289 /* Make sure the dynamic linker's really a useful object. */
1290 if (!bfd_check_format (tmp_bfd
, bfd_object
))
1292 warning ("Unable to grok dynamic linker %s as an object file", buf
);
1293 bfd_close (tmp_bfd
);
1294 goto bkpt_at_symbol
;
1297 /* We find the dynamic linker's base address by examining the
1298 current pc (which point at the entry point for the dynamic
1299 linker) and subtracting the offset of the entry point. */
1300 load_addr
= read_pc () - tmp_bfd
->start_address
;
1302 /* Record the relocated start and end address of the dynamic linker
1303 text and plt section for in_svr4_dynsym_resolve_code. */
1304 interp_sect
= bfd_get_section_by_name (tmp_bfd
, ".text");
1307 interp_text_sect_low
=
1308 bfd_section_vma (tmp_bfd
, interp_sect
) + load_addr
;
1309 interp_text_sect_high
=
1310 interp_text_sect_low
+ bfd_section_size (tmp_bfd
, interp_sect
);
1312 interp_sect
= bfd_get_section_by_name (tmp_bfd
, ".plt");
1315 interp_plt_sect_low
=
1316 bfd_section_vma (tmp_bfd
, interp_sect
) + load_addr
;
1317 interp_plt_sect_high
=
1318 interp_plt_sect_low
+ bfd_section_size (tmp_bfd
, interp_sect
);
1321 /* Now try to set a breakpoint in the dynamic linker. */
1322 for (bkpt_namep
= solib_break_names
; *bkpt_namep
!= NULL
; bkpt_namep
++)
1324 sym_addr
= bfd_lookup_symbol (tmp_bfd
, *bkpt_namep
);
1329 /* We're done with the temporary bfd. */
1330 bfd_close (tmp_bfd
);
1334 create_solib_event_breakpoint (load_addr
+ sym_addr
);
1338 /* For whatever reason we couldn't set a breakpoint in the dynamic
1339 linker. Warn and drop into the old code. */
1341 warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code.");
1345 /* Scan through the list of symbols, trying to look up the symbol and
1346 set a breakpoint there. Terminate loop when we/if we succeed. */
1348 breakpoint_addr
= 0;
1349 for (bkpt_namep
= bkpt_names
; *bkpt_namep
!= NULL
; bkpt_namep
++)
1351 msymbol
= lookup_minimal_symbol (*bkpt_namep
, NULL
, symfile_objfile
);
1352 if ((msymbol
!= NULL
) && (SYMBOL_VALUE_ADDRESS (msymbol
) != 0))
1354 create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol
));
1359 /* Nothing good happened. */
1362 #endif /* BKPT_AT_SYMBOL */
1364 #endif /* !SVR4_SHARED_LIBS */
1373 special_symbol_handling -- additional shared library symbol handling
1377 void special_symbol_handling ()
1381 Once the symbols from a shared object have been loaded in the usual
1382 way, we are called to do any system specific symbol handling that
1385 For SunOS4, this consists of grunging around in the dynamic
1386 linkers structures to find symbol definitions for "common" symbols
1387 and adding them to the minimal symbol table for the runtime common
1393 svr4_special_symbol_handling (void)
1395 #ifndef SVR4_SHARED_LIBS
1398 if (debug_addr
== 0)
1400 /* Get link_dynamic structure */
1402 j
= target_read_memory (debug_base
, (char *) &dynamic_copy
,
1403 sizeof (dynamic_copy
));
1410 /* Calc address of debugger interface structure */
1411 /* FIXME, this needs work for cross-debugging of core files
1412 (byteorder, size, alignment, etc). */
1414 debug_addr
= SOLIB_EXTRACT_ADDRESS (dynamic_copy
.ldd
);
1417 /* Read the debugger structure from the inferior, just to make sure
1418 we have a current copy. */
1420 j
= target_read_memory (debug_addr
, (char *) &debug_copy
,
1421 sizeof (debug_copy
));
1423 return; /* unreadable */
1425 /* Get common symbol definitions for the loaded object. */
1427 if (debug_copy
.ldd_cp
)
1429 solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy
.ldd_cp
));
1432 #endif /* !SVR4_SHARED_LIBS */
1435 /* Relocate the main executable. This function should be called upon
1436 stopping the inferior process at the entry point to the program.
1437 The entry point from BFD is compared to the PC and if they are
1438 different, the main executable is relocated by the proper amount.
1440 As written it will only attempt to relocate executables which
1441 lack interpreter sections. It seems likely that only dynamic
1442 linker executables will get relocated, though it should work
1443 properly for a position-independent static executable as well. */
1446 svr4_relocate_main_executable (void)
1448 asection
*interp_sect
;
1449 CORE_ADDR pc
= read_pc ();
1451 /* Decide if the objfile needs to be relocated. As indicated above,
1452 we will only be here when execution is stopped at the beginning
1453 of the program. Relocation is necessary if the address at which
1454 we are presently stopped differs from the start address stored in
1455 the executable AND there's no interpreter section. The condition
1456 regarding the interpreter section is very important because if
1457 there *is* an interpreter section, execution will begin there
1458 instead. When there is an interpreter section, the start address
1459 is (presumably) used by the interpreter at some point to start
1460 execution of the program.
1462 If there is an interpreter, it is normal for it to be set to an
1463 arbitrary address at the outset. The job of finding it is
1464 handled in enable_break().
1466 So, to summarize, relocations are necessary when there is no
1467 interpreter section and the start address obtained from the
1468 executable is different from the address at which GDB is
1471 [ The astute reader will note that we also test to make sure that
1472 the executable in question has the DYNAMIC flag set. It is my
1473 opinion that this test is unnecessary (undesirable even). It
1474 was added to avoid inadvertent relocation of an executable
1475 whose e_type member in the ELF header is not ET_DYN. There may
1476 be a time in the future when it is desirable to do relocations
1477 on other types of files as well in which case this condition
1478 should either be removed or modified to accomodate the new file
1479 type. (E.g, an ET_EXEC executable which has been built to be
1480 position-independent could safely be relocated by the OS if
1481 desired. It is true that this violates the ABI, but the ABI
1482 has been known to be bent from time to time.) - Kevin, Nov 2000. ]
1485 interp_sect
= bfd_get_section_by_name (exec_bfd
, ".interp");
1486 if (interp_sect
== NULL
1487 && (bfd_get_file_flags (exec_bfd
) & DYNAMIC
) != 0
1488 && bfd_get_start_address (exec_bfd
) != pc
)
1490 struct cleanup
*old_chain
;
1491 struct section_offsets
*new_offsets
;
1493 CORE_ADDR displacement
;
1495 /* It is necessary to relocate the objfile. The amount to
1496 relocate by is simply the address at which we are stopped
1497 minus the starting address from the executable.
1499 We relocate all of the sections by the same amount. This
1500 behavior is mandated by recent editions of the System V ABI.
1501 According to the System V Application Binary Interface,
1502 Edition 4.1, page 5-5:
1504 ... Though the system chooses virtual addresses for
1505 individual processes, it maintains the segments' relative
1506 positions. Because position-independent code uses relative
1507 addressesing between segments, the difference between
1508 virtual addresses in memory must match the difference
1509 between virtual addresses in the file. The difference
1510 between the virtual address of any segment in memory and
1511 the corresponding virtual address in the file is thus a
1512 single constant value for any one executable or shared
1513 object in a given process. This difference is the base
1514 address. One use of the base address is to relocate the
1515 memory image of the program during dynamic linking.
1517 The same language also appears in Edition 4.0 of the System V
1518 ABI and is left unspecified in some of the earlier editions. */
1520 displacement
= pc
- bfd_get_start_address (exec_bfd
);
1523 new_offsets
= xcalloc (sizeof (struct section_offsets
),
1524 symfile_objfile
->num_sections
);
1525 old_chain
= make_cleanup (xfree
, new_offsets
);
1527 for (i
= 0; i
< symfile_objfile
->num_sections
; i
++)
1529 if (displacement
!= ANOFFSET (symfile_objfile
->section_offsets
, i
))
1531 new_offsets
->offsets
[i
] = displacement
;
1535 objfile_relocate (symfile_objfile
, new_offsets
);
1537 do_cleanups (old_chain
);
1545 svr4_solib_create_inferior_hook -- shared library startup support
1549 void svr4_solib_create_inferior_hook()
1553 When gdb starts up the inferior, it nurses it along (through the
1554 shell) until it is ready to execute it's first instruction. At this
1555 point, this function gets called via expansion of the macro
1556 SOLIB_CREATE_INFERIOR_HOOK.
1558 For SunOS executables, this first instruction is typically the
1559 one at "_start", or a similar text label, regardless of whether
1560 the executable is statically or dynamically linked. The runtime
1561 startup code takes care of dynamically linking in any shared
1562 libraries, once gdb allows the inferior to continue.
1564 For SVR4 executables, this first instruction is either the first
1565 instruction in the dynamic linker (for dynamically linked
1566 executables) or the instruction at "start" for statically linked
1567 executables. For dynamically linked executables, the system
1568 first exec's /lib/libc.so.N, which contains the dynamic linker,
1569 and starts it running. The dynamic linker maps in any needed
1570 shared libraries, maps in the actual user executable, and then
1571 jumps to "start" in the user executable.
1573 For both SunOS shared libraries, and SVR4 shared libraries, we
1574 can arrange to cooperate with the dynamic linker to discover the
1575 names of shared libraries that are dynamically linked, and the
1576 base addresses to which they are linked.
1578 This function is responsible for discovering those names and
1579 addresses, and saving sufficient information about them to allow
1580 their symbols to be read at a later time.
1584 Between enable_break() and disable_break(), this code does not
1585 properly handle hitting breakpoints which the user might have
1586 set in the startup code or in the dynamic linker itself. Proper
1587 handling will probably have to wait until the implementation is
1588 changed to use the "breakpoint handler function" method.
1590 Also, what if child has exit()ed? Must exit loop somehow.
1594 svr4_solib_create_inferior_hook (void)
1596 /* Relocate the main executable if necessary. */
1597 svr4_relocate_main_executable ();
1599 /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base
1600 yet. In fact, in the case of a SunOS4 executable being run on
1601 Solaris, we can't get it yet. current_sos will get it when it needs
1603 #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL))
1604 if ((debug_base
= locate_base ()) == 0)
1606 /* Can't find the symbol or the executable is statically linked. */
1611 if (!enable_break ())
1613 warning ("shared library handler failed to enable breakpoint");
1617 #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS)
1618 /* SCO and SunOS need the loop below, other systems should be using the
1619 special shared library breakpoints and the shared library breakpoint
1622 Now run the target. It will eventually hit the breakpoint, at
1623 which point all of the libraries will have been mapped in and we
1624 can go groveling around in the dynamic linker structures to find
1625 out what we need to know about them. */
1627 clear_proceed_status ();
1628 stop_soon_quietly
= 1;
1629 stop_signal
= TARGET_SIGNAL_0
;
1632 target_resume (-1, 0, stop_signal
);
1633 wait_for_inferior ();
1635 while (stop_signal
!= TARGET_SIGNAL_TRAP
);
1636 stop_soon_quietly
= 0;
1638 #if !defined(_SCO_DS)
1639 /* We are now either at the "mapping complete" breakpoint (or somewhere
1640 else, a condition we aren't prepared to deal with anyway), so adjust
1641 the PC as necessary after a breakpoint, disable the breakpoint, and
1642 add any shared libraries that were mapped in. */
1644 if (DECR_PC_AFTER_BREAK
)
1646 stop_pc
-= DECR_PC_AFTER_BREAK
;
1647 write_register (PC_REGNUM
, stop_pc
);
1650 if (!disable_break ())
1652 warning ("shared library handler failed to disable breakpoint");
1656 solib_add ((char *) 0, 0, (struct target_ops
*) 0);
1657 #endif /* ! _SCO_DS */
1662 svr4_clear_solib (void)
1668 svr4_free_so (struct so_list
*so
)
1670 xfree (so
->lm_info
->lm
);
1671 xfree (so
->lm_info
);
1675 svr4_relocate_section_addresses (struct so_list
*so
,
1676 struct section_table
*sec
)
1678 sec
->addr
+= LM_ADDR (so
);
1679 sec
->endaddr
+= LM_ADDR (so
);
1682 static struct target_so_ops svr4_so_ops
;
1685 _initialize_svr4_solib (void)
1687 svr4_so_ops
.relocate_section_addresses
= svr4_relocate_section_addresses
;
1688 svr4_so_ops
.free_so
= svr4_free_so
;
1689 svr4_so_ops
.clear_solib
= svr4_clear_solib
;
1690 svr4_so_ops
.solib_create_inferior_hook
= svr4_solib_create_inferior_hook
;
1691 svr4_so_ops
.special_symbol_handling
= svr4_special_symbol_handling
;
1692 svr4_so_ops
.current_sos
= svr4_current_sos
;
1693 svr4_so_ops
.open_symbol_file_object
= open_symbol_file_object
;
1695 /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */
1696 current_target_so_ops
= &svr4_so_ops
;