Fix regression for _setjmp, fucntion does not use stack and adjusting

it causes restored stack to be incorrect.

diff --git a/lib/libc/arch/riscv64/gen/_setjmp.S b/lib/libc/arch/riscv64/gen/_setjmp.S
index 85bbe0b..724ba86 100644 (file)
--- a/lib/libc/arch/riscv64/gen/_setjmp.S
+++ b/lib/libc/arch/riscv64/gen/_setjmp.S
@@ -1,4 +1,4 @@
-/*     $OpenBSD: _setjmp.S,v 1.2 2021/05/09 21:26:06 drahn Exp $       */
+/*     $OpenBSD: _setjmp.S,v 1.3 2021/05/14 00:57:03 drahn Exp $       */
 /* 
  * Copyright (c) 2020 Dale Rahn <drahn@openbsd.org>
  *
@@ -20,7 +20,6 @@
 #include <machine/setjmp.h>
 
 ENTRY(_setjmp)
-       addi    sp, sp, -32
        RETGUARD_SETUP(_setjmp, t6)
 
        sd      sp, (1 * 8)(a0)
@@ -60,7 +59,6 @@ ENTRY(_setjmp)
        /* Return value */
        mv      a0, x0
        RETGUARD_CHECK(_setjmp, t6)
-       addi sp, sp, 32
        ret
 END_STRONG(_setjmp)