[PATCH]mips: ldso: dlopen with flag RTLD_NOW should look up the symbols

[Jean Lee]

After reading eglibc code, I find it's much similar to uclibc
ldso/ldso/mips/elfinterp.c:_dl_perform_mips_global_got_relocations.
See "
http://www.eglibc.org/svn/branches/eglibc-2_18/libc/ports/sysdeps/mips/dl-machine.h"
elf_machine_got_rel
function for more inspect.
I slightly modify my last patch to speed the fixup function.
Last patch: Go through the whole symtab.
This patch: Go through symtab[tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX], the
last item of symtab]. Actually this is the .got section. And .got section
is subset of symtab.



 [PATCH] MIPS: Scan the symtab for the dependency of the library to
 avoid runtime empty function pointer. The dependency =
 SHN_UNDEF && STB_GLOBAL && (STT_FUNC || STT_OBJECT)


Signed-off-by: Jean Lee <xiaoyur347 at gmail.com>
---
 ldso/ldso/mips/elfinterp.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/ldso/ldso/mips/elfinterp.c b/ldso/ldso/mips/elfinterp.c
index dfe37c5..a83da8d 100644
--- a/ldso/ldso/mips/elfinterp.c
+++ b/ldso/ldso/mips/elfinterp.c
@@ -162,6 +162,7 @@ int _dl_parse_relocation_information(struct dyn_elf
*xpnt,
 #endif

  struct symbol_ref sym_ref;
+ ElfW(Sym) *psym = NULL;
  /* Now parse the relocation information */
  rel_size = rel_size / sizeof(ElfW(Rel));
  rpnt = (ELF_RELOC *) rel_addr;
@@ -170,6 +171,33 @@ int _dl_parse_relocation_information(struct dyn_elf
*xpnt,
  strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
  got = (unsigned long *) tpnt->dynamic_info[DT_PLTGOT];

+ i = tpnt->dynamic_info[DT_MIPS_SYMTABNO_IDX] -
+ tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
+ psym = symtab + tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
+ for (; i != 0; --i, ++psym) {
+ if (psym->st_name == 0) {
+ continue;
+ }
+
+ if (psym->st_shndx != SHN_UNDEF
+ || ELF_ST_BIND(psym->st_info) != STB_GLOBAL
+ || (ELF_ST_TYPE(psym->st_info) != STT_FUNC
+ && ELF_ST_TYPE(psym->st_info) != STT_OBJECT)) {
+ continue;
+ }
+ symname = strtab + psym->st_name;
+
+ sym_ref.tpnt = NULL;
+ sym_ref.sym = psym;
+ symbol_addr = (unsigned long)_dl_find_hash(symname,
+ scope,
+ tpnt,
+ ELF_RTYPE_CLASS_PLT, &sym_ref);
+ if (symbol_addr == 0) {
+ _dl_dprintf (2, "%s: undefined symbol: %s\n",tpnt->libname, symname);
+ return 1;
+ }
+ }

  for (i = 0; i < rel_size; i++, rpnt++) {
  reloc_addr = (unsigned long *) (tpnt->loadaddr +