add support for init/finit (constructors and destructors)
this is mainly in hopes of supporting c++ (not yet possible for other
reasons) but will also help applications/libraries which use (and more
often, abuse) the gcc __attribute__((__constructor__)) feature in "C"
code.
x86_64 and arm versions of the new startup asm are untested and may
have minor problems.
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 057a4cd..ca49f43 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -49,6 +49,7 @@
ino_t ino;
int global;
int relocated;
+ int constructed;
struct dso **deps;
char *name;
char buf[];
@@ -471,6 +472,20 @@
return 0;
}
+static void do_init_fini(struct dso *p)
+{
+ size_t dyn[DYN_CNT] = {0};
+ for (; p; p=p->prev) {
+ if (p->constructed) return;
+ decode_vec(p->dynv, dyn, DYN_CNT);
+ if (dyn[0] & (1<<DT_FINI))
+ atexit((void (*)(void))(p->base + dyn[DT_FINI]));
+ if (dyn[0] & (1<<DT_INIT))
+ ((void (*)(void))(p->base + dyn[DT_INIT]))();
+ p->constructed = 1;
+ }
+}
+
void *__dynlink(int argc, char **argv)
{
size_t *auxv, aux[AUX_CNT] = {0};
@@ -520,6 +535,7 @@
}
app->name = argv[0];
app->global = 1;
+ app->constructed = 1;
app->dynv = (void *)(app->base + find_dyn(
(void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
decode_dyn(app);
@@ -577,6 +593,9 @@
* error. If the dynamic loader (dlopen) will not be used, free
* all memory used by the dynamic linker. */
runtime = 1;
+
+ do_init_fini(tail);
+
if (!rtld_used) {
free_all(head);
free(sys_path);