volatile int new_dtv_idx, new_tls_idx;
struct td_index *td_index;
struct dso *fini_next;
- int rel_early_relative, rel_update_got;
char *shortname;
char buf[];
};
} builtin_tls[1];
#define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)
+#define ADDEND_LIMIT 4096
+static size_t *saved_addends, *apply_addends_to;
+
static struct dso ldso;
static struct dso *head, *tail, *fini_head;
static char *env_path, *sys_path;
size_t sym_val;
size_t tls_val;
size_t addend;
+ int skip_relative = 0, reuse_addends = 0, save_slot = 0;
+
+ if (dso == &ldso) {
+ /* Only ldso's REL table needs addend saving/reuse. */
+ if (rel == apply_addends_to)
+ reuse_addends = 1;
+ skip_relative = 1;
+ }
for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
- if (dso->rel_early_relative && IS_RELATIVE(rel[1])) continue;
+ if (skip_relative && IS_RELATIVE(rel[1])) continue;
type = R_TYPE(rel[1]);
+ if (type == REL_NONE) continue;
sym_index = R_SYM(rel[1]);
reloc_addr = (void *)(base + rel[0]);
if (sym_index) {
def.dso = dso;
}
- int gotplt = (type == REL_GOT || type == REL_PLT);
- if (dso->rel_update_got && !gotplt && stride==2) continue;
-
- addend = stride>2 ? rel[2]
- : gotplt || type==REL_COPY ? 0
- : *reloc_addr;
+ if (stride > 2) {
+ addend = rel[2];
+ } else if (type==REL_GOT || type==REL_PLT|| type==REL_COPY) {
+ addend = 0;
+ } else if (reuse_addends) {
+ /* Save original addend in stage 2 where the dso
+ * chain consists of just ldso; otherwise read back
+ * saved addend since the inline one was clobbered. */
+ if (head==&ldso)
+ saved_addends[save_slot] = *reloc_addr;
+ addend = saved_addends[save_slot++];
+ } else {
+ addend = *reloc_addr;
+ }
sym_val = def.sym ? (size_t)def.dso->base+def.sym->st_value : 0;
tls_val = def.sym ? def.sym->st_value : 0;
size_t i, j, rel[2];
unsigned char *base = p->base;
i=0; search_vec(p->dynv, &i, DT_MIPS_LOCAL_GOTNO);
- if (p->rel_early_relative) {
+ if (p==&ldso) {
got += i;
} else {
while (i--) *got++ += (size_t)base;
ldso.phnum = ehdr->e_phnum;
ldso.phdr = (void *)(base + ehdr->e_phoff);
ldso.phentsize = ehdr->e_phentsize;
- ldso.rel_early_relative = 1;
kernel_mapped_dso(&ldso);
decode_dyn(&ldso);
+ /* Prepare storage for to save clobbered REL addends so they
+ * can be reused in stage 3. There should be very few. If
+ * something goes wrong and there are a huge number, abort
+ * instead of risking stack overflow. */
+ size_t dyn[DYN_CNT];
+ decode_vec(ldso.dynv, dyn, DYN_CNT);
+ size_t *rel = (void *)(base+dyn[DT_REL]);
+ size_t rel_size = dyn[DT_RELSZ];
+ size_t symbolic_rel_cnt = 0;
+ apply_addends_to = rel;
+ for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t))
+ if (!IS_RELATIVE(rel[1])) symbolic_rel_cnt++;
+ if (symbolic_rel_cnt >= ADDEND_LIMIT) a_crash();
+ size_t addends[symbolic_rel_cnt+1];
+ saved_addends = addends;
+
head = &ldso;
reloc_all(&ldso);
ldso.relocated = 0;
- ldso.rel_update_got = 1;
/* Call dynamic linker stage-3, __dls3, looking it up
* symbolically as a barrier against moving the address
char **argv_orig = argv;
char **envp = argv+argc+1;
+ /* Find aux vector just past environ[] and use it to initialize
+ * global data that may be needed before we can make syscalls. */
+ __environ = envp;
+ for (i=argc+1; argv[i]; i++);
+ libc.auxv = auxv = (void *)(argv+i+1);
+ decode_vec(auxv, aux, AUX_CNT);
+ __hwcap = aux[AT_HWCAP];
+ libc.page_size = aux[AT_PAGESZ];
+ libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
+ || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]);
+
/* Setup early thread pointer in builtin_tls for ldso/libc itself to
* use during dynamic linking. If possible it will also serve as the
* thread pointer at runtime. */
a_crash();
}
- /* Find aux vector just past environ[] */
- for (i=argc+1; argv[i]; i++)
- if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
- env_path = argv[i]+16;
- else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
- env_preload = argv[i]+11;
- auxv = (void *)(argv+i+1);
-
- decode_vec(auxv, aux, AUX_CNT);
-
/* Only trust user/env if kernel says we're not suid/sgid */
- if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
- || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
- env_path = 0;
- env_preload = 0;
- libc.secure = 1;
+ if (!libc.secure) {
+ env_path = getenv("LD_LIBRARY_PATH");
+ env_preload = getenv("LD_PRELOAD");
}
- libc.page_size = aux[AT_PAGESZ];
- libc.auxv = auxv;
/* If the main program was already loaded by the kernel,
* AT_PHDR will point to some location other than the dynamic
projects / musl / blobdiff