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* solib-svr4.c: Add include of "auxv.h".

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(enable_break): Use the AT_BASE auxiliary entry if available.
        * Makefile.in (solib-svr4.o): Update dependencies.
This commit is contained in:
Joel Brobecker 2007-09-17 19:32:53 +00:00
parent f9ed52beed
commit 8d4e36bad1
3 changed files with 19 additions and 7 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2007-09-17 Joel Brobecker <brobecker@adacore.com>
* solib-svr4.c: Add include of "auxv.h".
(enable_break): Use the AT_BASE auxiliary entry if available.
* Makefile.in (solib-svr4.o): Update dependencies.
2007-09-17 Joel Brobecker <brobecker@adacore.com>
* NEWS: Create a new section for the next release branch.

2
gdb/Makefile.in
View file

@ -2622,7 +2622,7 @@ solib-svr4.o: solib-svr4.c $(defs_h) $(elf_external_h) $(elf_common_h) \
$(elf_mips_h) $(symtab_h) $(bfd_h) $(symfile_h) $(objfiles_h) \
$(gdbcore_h) $(target_h) $(inferior_h) $(gdb_assert_h) \
$(solist_h) $(solib_h) $(solib_svr4_h) $(bfd_target_h) $(elf_bfd_h) \
$(exec_h)
$(exec_h) $(auxv_h)
solib-target.o: solib-target.c $(defs_h) $(objfiles_h) $(solist_h) \
$(symtab_h) $(symfile_h) $(target_h) $(vec_h) $(xml_support_h) \
$(gdb_string_h)

18
gdb/solib-svr4.c
View file

@ -41,6 +41,7 @@
#include "bfd-target.h"
#include "elf-bfd.h"
#include "exec.h"
#include "auxv.h"
static struct link_map_offsets *svr4_fetch_link_map_offsets (void);
static int svr4_have_link_map_offsets (void);
@ -1008,11 +1009,6 @@ enable_break (void)
be trivial on GNU/Linux). Therefore, we have to try an alternate
mechanism to find the dynamic linker's base address. */
/* TODO drow/2006-09-12: This is somewhat fragile, because it
relies on read_pc. On both Solaris and GNU/Linux we can use
the AT_BASE auxilliary entry, which GDB now knows how to
access, to find the base address. */
tmp_fd = solib_open (buf, &tmp_pathname);
if (tmp_fd >= 0)
tmp_bfd = bfd_fopen (tmp_pathname, gnutarget, FOPEN_RB, tmp_fd);
@ -1048,9 +1044,19 @@ enable_break (void)
so = so->next;
}
/* If we were not able to find the base address of the loader
from our so_list, then try using the AT_BASE auxilliary entry. */
if (!load_addr_found)
if (target_auxv_search (&current_target, AT_BASE, &load_addr) > 0)
load_addr_found = 1;
/* Otherwise we find the dynamic linker's base address by examining
the current pc (which should point at the entry point for the
dynamic linker) and subtracting the offset of the entry point. */
dynamic linker) and subtracting the offset of the entry point.
This is more fragile than the previous approaches, but is a good
fallback method because it has actually been working well in
most cases. */
if (!load_addr_found)
{
load_addr = (read_pc ()