From 1553c8eae7d830cb793e78c3e52ad816fa8efd23 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Tue, 28 Oct 2025 08:27:07 -0700
Subject: [PATCH] std.os.linux.x86: fix signal restore function

After handling any signal on x86, it would previously segfault.
---
 lib/std/os/linux/x86.zig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/std/os/linux/x86.zig b/lib/std/os/linux/x86.zig
index 3770607f55..a68a4af317 100644
--- a/lib/std/os/linux/x86.zig
+++ b/lib/std/os/linux/x86.zig
@@ -159,12 +159,14 @@ pub fn clone() callconv(.naked) u32 {
 pub fn restore() callconv(.naked) noreturn {
     switch (builtin.zig_backend) {
         .stage2_c => asm volatile (
+            \\ addl $4, %%esp
             \\ movl %[number], %%eax
             \\ int $0x80
             :
             : [number] "i" (@intFromEnum(SYS.sigreturn)),
         ),
         else => asm volatile (
+            \\ addl $4, %%esp
             \\ int $0x80
             :
             : [number] "{eax}" (@intFromEnum(SYS.sigreturn)),