fix fdpic regression in dynamic linker with overly smart compilers

[musl] / ldso / dynlink.c

diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index acd2b20..a18461e 100644 (file)
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -185,8 +185,14 @@ static void *laddr_pg(const struct dso *p, size_t v)
        }
        return (void *)(v - p->loadmap->segs[j].p_vaddr + p->loadmap->segs[j].addr);
 }
-#define fpaddr(p, v) ((void (*)())&(struct funcdesc){ \
-       laddr(p, v), (p)->got })
+static void (*fdbarrier(void *p))()
+{
+       void (*fd)();
+       __asm__("" : "=r"(fd) : "0"(p));
+       return fd;
+}
+#define fpaddr(p, v) fdbarrier((&(struct funcdesc){ \
+       laddr(p, v), (p)->got }))
 #else
 #define laddr(p, v) (void *)((p)->base + (v))
 #define laddr_pg(p, v) laddr(p, v)