From b2bc44e0d5e5edde083ec281aa0575b16478d881 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Wed, 29 Oct 2025 20:44:03 +0100
Subject: [PATCH] std.os.linux: fix restore for powerpc/powerpc64

sigreturn and rt_sigreturn are distinct syscalls on PowerPC.
---
 lib/std/os/linux/powerpc.zig   | 16 +++++++++++++++-
 lib/std/os/linux/powerpc64.zig | 16 +++++++++++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/lib/std/os/linux/powerpc.zig b/lib/std/os/linux/powerpc.zig
index 46197d9085..d96a9d67f0 100644
--- a/lib/std/os/linux/powerpc.zig
+++ b/lib/std/os/linux/powerpc.zig
@@ -232,7 +232,21 @@ pub fn clone() callconv(.naked) u32 {
     );
 }
 
-pub const restore = restore_rt;
+pub fn restore() callconv(.naked) noreturn {
+    switch (builtin.zig_backend) {
+        .stage2_c => asm volatile (
+            \\ li 0, %[number]
+            \\ sc
+            :
+            : [number] "i" (@intFromEnum(SYS.sigreturn)),
+        ),
+        else => asm volatile (
+            \\ sc
+            :
+            : [number] "{r0}" (@intFromEnum(SYS.sigreturn)),
+        ),
+    }
+}
 
 pub fn restore_rt() callconv(.naked) noreturn {
     switch (builtin.zig_backend) {
diff --git a/lib/std/os/linux/powerpc64.zig b/lib/std/os/linux/powerpc64.zig
index 6ff666910f..d1663feaa8 100644
--- a/lib/std/os/linux/powerpc64.zig
+++ b/lib/std/os/linux/powerpc64.zig
@@ -217,7 +217,21 @@ pub fn clone() callconv(.naked) u64 {
     );
 }
 
-pub const restore = restore_rt;
+pub fn restore() callconv(.naked) noreturn {
+    switch (builtin.zig_backend) {
+        .stage2_c => asm volatile (
+            \\ li 0, %[number]
+            \\ sc
+            :
+            : [number] "i" (@intFromEnum(SYS.sigreturn)),
+        ),
+        else => asm volatile (
+            \\ sc
+            :
+            : [number] "{r0}" (@intFromEnum(SYS.sigreturn)),
+        ),
+    }
+}
 
 pub fn restore_rt() callconv(.naked) noreturn {
     switch (builtin.zig_backend) {