altstack: Declare memory clobbers

[ccan] / ccan / altstack / altstack.c

diff --git a/ccan/altstack/altstack.c b/ccan/altstack/altstack.c
index 640344db91e6f38da6719ca4418d6439ab59381a..63512931f8955a7efe34b41f52df2696246701fd 100644 (file)
--- a/ccan/altstack/altstack.c
+++ b/ccan/altstack/altstack.c
@@ -108,9 +108,10 @@ int altstack(rlim_t max, void *(*fn)(void *), void *arg, void **out)
                        "mov %1, %%rsp\n\t"
                        "sub $8, %%rsp\n\t"
                        "push %%r10"
-                       : "=r" (rsp_save_[0]) : "0" (m + max) : "r10");
+                       : "=r" (rsp_save_[0]) : "0" (m + max) : "r10", "memory");
                out_ = fn_(arg_);
-               asm volatile ("pop %rsp");
+               asm volatile ("pop %%rsp"
+                             : : : "memory");
                ret = 0;
                if (out) *out = out_;
        }