From f7da960a33828505c91fb2d2f022f8966b6f9cc7 Mon Sep 17 00:00:00 2001
From: Michael Dusan <michael.dusan@gmail.com>
Date: Fri, 20 Sep 2024 16:49:14 -0400
Subject: [PATCH 1/2] stage1 ppc64: remove inline-asm overlapping clobbers

Required when bootstrapping with GCC.
---
 lib/std/os/linux/powerpc64.zig | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/std/os/linux/powerpc64.zig b/lib/std/os/linux/powerpc64.zig
index 04936a113d..06b67c17f1 100644
--- a/lib/std/os/linux/powerpc64.zig
+++ b/lib/std/os/linux/powerpc64.zig
@@ -48,7 +48,7 @@ pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
         : [number] "{r0}" (@intFromEnum(number)),
           [arg1] "{r3}" (arg1),
           [arg2] "{r4}" (arg2),
-        : "memory", "cr0", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
+        : "memory", "cr0", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
     );
 }
 
@@ -63,7 +63,7 @@ pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
           [arg1] "{r3}" (arg1),
           [arg2] "{r4}" (arg2),
           [arg3] "{r5}" (arg3),
-        : "memory", "cr0", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
+        : "memory", "cr0", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
     );
 }
 
@@ -79,7 +79,7 @@ pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize)
           [arg2] "{r4}" (arg2),
           [arg3] "{r5}" (arg3),
           [arg4] "{r6}" (arg4),
-        : "memory", "cr0", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
+        : "memory", "cr0", "r7", "r8", "r9", "r10", "r11", "r12"
     );
 }
 
@@ -96,7 +96,7 @@ pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize,
           [arg3] "{r5}" (arg3),
           [arg4] "{r6}" (arg4),
           [arg5] "{r7}" (arg5),
-        : "memory", "cr0", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
+        : "memory", "cr0", "r8", "r9", "r10", "r11", "r12"
     );
 }
 
@@ -122,7 +122,7 @@ pub fn syscall6(
           [arg4] "{r6}" (arg4),
           [arg5] "{r7}" (arg5),
           [arg6] "{r8}" (arg6),
-        : "memory", "cr0", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
+        : "memory", "cr0", "r9", "r10", "r11", "r12"
     );
 }
 

From 665d0157d5f333ebc6b353703e77661b11bcac8c Mon Sep 17 00:00:00 2001
From: Michael Dusan <michael.dusan@gmail.com>
Date: Sun, 22 Sep 2024 10:58:53 -0400
Subject: [PATCH 2/2] std ppc64: add nop to start inline-asm

fixes ld.lld error: call to save_start.posixCallMainAndExit lacks nop, can't restore toc
---
 lib/std/start.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/std/start.zig b/lib/std/start.zig
index 63255c17fc..01a33522d0 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -391,6 +391,7 @@ fn _start() callconv(.Naked) noreturn {
             \\ stdu 0, -32(1)
             \\ mtlr 0
             \\ b %[posixCallMainAndExit]
+            \\ nop
             ,
             .s390x =>
             // Set up the stack frame (register save area and cleared back-chain slot).