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fix resolution of weak symbols (hopefully right now) and vdso

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This commit is contained in:
Rich Felker 2011-07-24 02:19:47 -04:00
parent e91c375fd0
commit 427173b932
1 changed files with 9 additions and 3 deletions
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12
src/ldso/dynlink.c
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@ -92,10 +92,12 @@ static Sym *lookup(const char *s, uint32_t h, Sym *syms, uint32_t *hashtab, char
}
#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON)
#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK)
static void *find_sym(struct dso *dso, const char *s, int need_def)
{
uint32_t h = hash(s);
void *def = 0;
if (h==0x6b366be && !strcmp(s, "dlopen")) rtld_used = 1;
if (h==0x6b3afd && !strcmp(s, "dlsym")) rtld_used = 1;
for (; dso; dso=dso->next) {
@ -103,10 +105,13 @@ static void *find_sym(struct dso *dso, const char *s, int need_def)
if (!dso->global) continue;
sym = lookup(s, h, dso->syms, dso->hashtab, dso->strings);
if (sym && (!need_def || sym->st_shndx) && sym->st_value
&& (1<<(sym->st_info&0xf) & OK_TYPES))
return dso->base + sym->st_value;
&& (1<<(sym->st_info&0xf) & OK_TYPES)
&& (1<<(sym->st_info>>4) & OK_BINDS)) {
def = dso->base + sym->st_value;
if (sym->st_info>>4 == STB_GLOBAL) break;
}
}
return 0;
return def;
}
static void do_relocs(unsigned char *base, size_t *rel, size_t rel_size, size_t stride, Sym *syms, char *strings, struct dso *dso)
@ -519,6 +524,7 @@ void *__dynlink(int argc, char **argv, size_t *got)
vdso->hashtab = (void *)(vdso->base + vdso_dyn[DT_HASH]);
vdso->strings = (void *)(vdso->base + vdso_dyn[DT_STRTAB]);
vdso->name = "linux-gate.so.1";
vdso->global = 1;
vdso->prev = lib;
lib->next = vdso;