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Support GOT32 and PLT32 reloc for same symbol

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Some symbol (such as __gmon_start__ but this one does not matter to tcc)
can have both a R_386_GOT32 and R_386_PLT32 relocation. It is thus not
enough to test if a GOT reloc was already done when deciding whether to
return early from put_got_entry.
This commit is contained in:
Thomas Preud'homme 2014-03-25 22:35:11 +08:00
parent 078ba241d9
commit dc8ea93b13
1 changed files with 31 additions and 11 deletions
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42
tccelf.c
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@ -1008,7 +1008,7 @@ static void put_got_entry(TCCState *s1,
int reloc_type, unsigned long size, int info,
int sym_index)
{
int index;
int index, need_plt_entry, got_entry_present = 0;
const char *name;
ElfW(Sym) *sym;
unsigned long offset;
@ -1017,25 +1017,38 @@ static void put_got_entry(TCCState *s1,
if (!s1->got)
build_got(s1);
need_plt_entry = s1->dynsym &&
#ifdef TCC_TARGET_X86_64
(reloc_type == R_X86_64_JUMP_SLOT);
#elif defined(TCC_TARGET_I386)
(reloc_type == R_386_JMP_SLOT);
#elif defined(TCC_TARGET_ARM)
(reloc_type == R_ARM_JUMP_SLOT);
#else
0;
#endif
/* if a got entry already exists for that symbol, no need to add one */
if (sym_index < s1->nb_sym_attrs &&
s1->sym_attrs[sym_index].got_offset)
return;
s1->sym_attrs[sym_index].got_offset) {
if (!need_plt_entry)
return;
else
got_entry_present = 1;
}
alloc_sym_attr(s1, sym_index)->got_offset = s1->got->data_offset;
if (s1->dynsym) {
sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
name = (char *) symtab_section->link->data + sym->st_name;
if (!find_elf_sym(s1->dynsym, name))
need_plt_entry = 1;
else
return;
offset = sym->st_value;
#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
if (reloc_type ==
#ifdef TCC_TARGET_X86_64
R_X86_64_JUMP_SLOT
#else
R_386_JMP_SLOT
#endif
) {
if (need_plt_entry) {
Section *plt;
uint8_t *p;
int modrm;
@ -1080,7 +1093,7 @@ static void put_got_entry(TCCState *s1,
offset = plt->data_offset - 16;
}
#elif defined(TCC_TARGET_ARM)
if (reloc_type == R_ARM_JUMP_SLOT) {
if (need_plt_entry) {
Section *plt;
uint8_t *p;
@ -1123,6 +1136,13 @@ static void put_got_entry(TCCState *s1,
#endif
index = put_elf_sym(s1->dynsym, offset,
size, info, 0, sym->st_shndx, name);
if (got_entry_present) {
put_elf_reloc(s1->dynsym, s1->got,
s1->sym_attrs[sym_index].got_offset,
reloc_type, index);
return;
}
/* put a got entry */
put_elf_reloc(s1->dynsym, s1->got,
s1->got->data_offset,