From ce81525f3f3057e4239332b2152bf60f75c5f52a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Wed, 24 Jul 2024 17:36:34 +0200
Subject: [PATCH] start: Align the stack on s390x just in case.

The kernel does this as required, but we cannot trust dynamic linkers to do it.
---
 lib/std/start.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/std/start.zig b/lib/std/start.zig
index 015f2c077f..437498d1d8 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -373,8 +373,9 @@ fn _start() callconv(.Naked) noreturn {
             ,
             .s390x =>
             // Set up the stack frame (register save area and cleared back-chain slot).
-            // Note: Stack pointer is guaranteed by ABI to be 8-byte aligned as required.
             \\ lgr %r2, %r15
+            \\ lghi %r0, -16
+            \\ ngr %r15, %r0
             \\ aghi %r15, -160
             \\ lghi %r0, 0
             \\ stg  %r0, 0(%r15)