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* solib-dsbt.c (bfd_lookup_symbol): Removed.
	(cmp_name): New.
	(enable_break2): Update caller.
	* solib-frv.c (bfd_lookup_symbol): Removed.
	(cmp_name): New.
	(enable_break2): Update caller.
	* solib-pa64.c (bfd_lookup_symbol): Removed.
	(cmp_name): New.
	* solib-svr4.c (bfd_lookup_symbol): Removed.
	(cmp_name_and_sec_flags): New.
	(enable_break): Update caller.
	* solib.c (gdb_bfd_lookup_symbol_from_symtab): New.
	(gdb_bfd_lookup_symbol_from_dyn_symtab): New.
	(gdb_bfd_lookup_symbol): New.
	* solib.h: Functions declarations.
This commit is contained in:
Yao Qi
2011-08-30 02:48:05 +00:00
parent 83d1a36ae4
commit cb457ae284
7 changed files with 162 additions and 266 deletions
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91
gdb/solib-svr4.c
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@ -370,86 +370,6 @@ get_svr4_info (void)
static int match_main (const char *);
/* Lookup the value for a specific symbol.
An expensive way to lookup the value of a single symbol for
bfd's that are only temporary anyway. This is used by the
shared library support to find the address of the debugger
notification routine in the shared library.
The returned symbol may be in a code or data section; functions
will normally be in a code section, but may be in a data section
if this architecture uses function descriptors.
Note that 0 is specifically allowed as an error return (no
such symbol). */
static CORE_ADDR
bfd_lookup_symbol (bfd *abfd, const char *symname)
{
long storage_needed;
asymbol *sym;
asymbol **symbol_table;
unsigned int number_of_symbols;
unsigned int i;
struct cleanup *back_to;
CORE_ADDR symaddr = 0;
storage_needed = bfd_get_symtab_upper_bound (abfd);
if (storage_needed > 0)
{
symbol_table = (asymbol **) xmalloc (storage_needed);
back_to = make_cleanup (xfree, symbol_table);
number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
for (i = 0; i < number_of_symbols; i++)
{
sym = *symbol_table++;
if (strcmp (sym->name, symname) == 0
&& (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0)
{
/* BFD symbols are section relative. */
symaddr = sym->value + sym->section->vma;
break;
}
}
do_cleanups (back_to);
}
if (symaddr)
return symaddr;
/* On FreeBSD, the dynamic linker is stripped by default. So we'll
have to check the dynamic string table too. */
storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd);
if (storage_needed > 0)
{
symbol_table = (asymbol **) xmalloc (storage_needed);
back_to = make_cleanup (xfree, symbol_table);
number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table);
for (i = 0; i < number_of_symbols; i++)
{
sym = *symbol_table++;
if (strcmp (sym->name, symname) == 0
&& (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0)
{
/* BFD symbols are section relative. */
symaddr = sym->value + sym->section->vma;
break;
}
}
do_cleanups (back_to);
}
return symaddr;
}
/* Read program header TYPE from inferior memory. The header is found
by scanning the OS auxillary vector.
@ -1253,6 +1173,14 @@ exec_entry_point (struct bfd *abfd, struct target_ops *targ)
targ);
}
/* Helper function for gdb_bfd_lookup_symbol. */
static int
cmp_name_and_sec_flags (asymbol *sym, void *data)
{
return (strcmp (sym->name, (const char *) data) == 0
&& (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0);
}
/* Arrange for dynamic linker to hit breakpoint.
Both the SunOS and the SVR4 dynamic linkers have, as part of their
@ -1501,7 +1429,8 @@ enable_break (struct svr4_info *info, int from_tty)
/* Now try to set a breakpoint in the dynamic linker. */
for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++)
{
sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep);
sym_addr = gdb_bfd_lookup_symbol (tmp_bfd, cmp_name_and_sec_flags,
(void *) *bkpt_namep);
if (sym_addr != 0)
break;
}