From 006bc5a8ca815e5c20438fa747bfbb336a6b5066 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Fri, 3 Oct 2025 03:25:16 +0200
Subject: [PATCH] std.os.linux: improve the s390x mcontext_t definition

The old one was correct in terms of layout but very user-hostile.
---
 lib/std/os/linux/s390x.zig | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/std/os/linux/s390x.zig b/lib/std/os/linux/s390x.zig
index 71594d4a65..86495f6f79 100644
--- a/lib/std/os/linux/s390x.zig
+++ b/lib/std/os/linux/s390x.zig
@@ -269,7 +269,12 @@ pub const ucontext_t = extern struct {
 };
 
 pub const mcontext_t = extern struct {
-    __regs1: [18]u64,
-    __regs2: [18]u32,
-    __regs3: [16]f64,
+    psw: extern struct {
+        mask: u64,
+        addr: u64,
+    },
+    gregs: [16]u64,
+    aregs: [16]u32,
+    fpc: u32,
+    fregs: [16]f64,
 };