linux syscall trashes rcx & r11

2025-12-04 01:02:29 -06:00
parent 28d44f2bbf
commit 511bf09d65
1 changed files with 3 additions and 1 deletions
--- 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