From 511bf09d6578f28d8b65442857b6fbb8280ff238 Mon Sep 17 00:00:00 2001
From: Lucia Ceionia <lucia@ceionia.com>
Date: Thu, 4 Dec 2025 01:02:29 -0600
Subject: [PATCH] linux syscall trashes rcx & r11

---
 lib.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib.h b/lib.h
index 3f358b3..0f0aac9 100644
--- a/lib.h
+++ b/lib.h
@@ -13,7 +13,9 @@ static
 void write(uint64_t fileno, void *buffer, size_t len) {
     uint64_t a,d;
     asm volatile("syscall"
-        :"=a"(a),"=d"(d):"a"(SYS_write),"D"(fileno),"S"(buffer),"d"(len):"memory");
+        :"=a"(a),"=d"(d)
+        :"a"(SYS_write),"D"(fileno),"S"(buffer),"d"(len)
+        :"cc","memory","%rcx","%r11");
 }
 
 [[noreturn]] static