hurd: Fix computing user stack pointer

Fixes b574ae0a2876ee94e4fe617f878407bf818c2df0
"hurd: Implement sigreturn for x86_64"

Checked on x86_64-gnu.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230515083323.1358039-5-bugaevc@gmail.com>

diff --git a/sysdeps/mach/hurd/x86_64/sigreturn.c b/sysdeps/mach/hurd/x86_64/sigreturn.c
index 82247e3..5d3a4d3 100644 (file)
--- a/sysdeps/mach/hurd/x86_64/sigreturn.c
+++ b/sysdeps/mach/hurd/x86_64/sigreturn.c
@@ -126,7 +126,7 @@ __sigreturn (struct sigcontext *scp)
        copy the registers onto the user's stack, switch there, pop and
        return.  */
 
-    uintptr_t *usp = (uintptr_t *) scp->sc_ursp - 128;
+    uintptr_t *usp = (uintptr_t *) (scp->sc_ursp - 128);
 
     *--usp = scp->sc_rip;
     *--usp = scp->sc_rfl;