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For SVR4 targets, enable gdb to set breakpoints in shared

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library functions before the executable is run.
	* elfread.c (elf_symtab_read):  Handle symbols for shared library
	functions.
	* sparc-tdep.c (in_solib_trampoline):  Renamed to in_plt_section
	and moved to objfiles.c.
	* objfiles.c (in_plt_section):  Moved to here from sparc-tdep.
	* config/tm-sysv4.h (IN_SOLIB_TRAMPOLINE):  Use new in_plt_section.
	* config/sparc/tm-sun4sol2.h (IN_SOLIB_TRAMPOLINE):  Removed,
	the new generic definition from tm-sysv4.h works for Solaris.
This commit is contained in:
Peter Schauer 1994-04-01 08:50:03 +00:00
parent 01f8d30971
commit 38b9047360
3 changed files with 56 additions and 1 deletions
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13
gdb/ChangeLog
View File

@ -1,3 +1,16 @@
Fri Apr 1 00:44:00 1994 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
For SVR4 targets, enable gdb to set breakpoints in shared
library functions before the executable is run.
* elfread.c (elf_symtab_read): Handle symbols for shared library
functions.
* sparc-tdep.c (in_solib_trampoline): Renamed to in_plt_section
and moved to objfiles.c.
* objfiles.c (in_plt_section): Moved to here from sparc-tdep.
* config/tm-sysv4.h (IN_SOLIB_TRAMPOLINE): Use new in_plt_section.
* config/sparc/tm-sun4sol2.h (IN_SOLIB_TRAMPOLINE): Removed,
the new generic definition from tm-sysv4.h works for Solaris.
Wed Mar 30 16:14:27 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
* elfread.c (elf_symtab_read): Change storage_needed,

24
gdb/elfread.c
View File

@ -311,7 +311,29 @@ elf_symtab_read (abfd, addr, objfile)
/* For non-absolute symbols, use the type of the section
they are relative to, to intuit text/data. Bfd provides
no way of figuring this out for absolute symbols. */
if (sym -> section == &bfd_abs_section)
if (sym -> section == &bfd_und_section
&& (sym -> flags & BSF_GLOBAL)
&& (sym -> flags & BSF_FUNCTION))
{
/* Symbol is a reference to a function defined in
a shared library.
If its value is non zero then it is usually the
absolute address of the corresponding entry in
the procedure linkage table.
If its value is zero then the dynamic linker has to
resolve the symbol. We are unable to find any
meaningful address for this symbol in the
executable file, so we skip it.
Irix 5 has a zero value for all shared library functions
in the main symbol table. The dynamic symbol table
would provide the right values, but BFD currently
cannot handle dynamic ELF symbol tables. */
ms_type = mst_solib_trampoline;
symaddr = sym -> value;
if (symaddr == 0)
continue;
}
else if (sym -> section == &bfd_abs_section)
{
ms_type = mst_abs;
}

20
gdb/objfiles.c
View File

@ -825,3 +825,23 @@ find_pc_section(pc)
return(NULL);
}
/* In SVR4, we recognize a trampoline by it's section name.
That is, if the pc is in a section named ".plt" then we are in
a trampoline. */
int
in_plt_section(pc, name)
CORE_ADDR pc;
char *name;
{
struct obj_section *s;
int retval = 0;
s = find_pc_section(pc);
retval = (s != NULL
&& s->the_bfd_section->name != NULL
&& STREQ (s->the_bfd_section->name, ".plt"));
return(retval);
}