diff -NurpP --minimal dietlibc-0.28-orig/libcompat/syscall.S dietlibc-0.28-syscall/libcompat/syscall.S
--- dietlibc-0.28-orig/libcompat/syscall.S	2004-03-28 02:13:43.000000000 -0600
+++ dietlibc-0.28-syscall/libcompat/syscall.S	2005-04-09 13:38:50.000000000 -0500
@@ -77,5 +77,27 @@ syscall:
 	cmp.eq p6,p0=-1,r10
 (p6)	br __error_unified_syscall
 	br.ret.sptk.few rp
+#elif (defined(__x86_64__))
+	mov %rdi, %rax
+	mov %rsi, %rdi
+	mov %rdx, %rsi
+	mov %rcx, %rdx
+	mov %r8, %r10
+	mov %r9, %r8
+	mov 0x8(%rsp), %r9
+	syscall
+	cmp $0xfffffffffffff001,%rax
+	jb .Lret
+#ifdef __DYN_LIB
+	mov %rax, %rdx
+	// call __errno_location
+	// mov %rdx, (%rax)
+#else
+	mov %rax, errno
+#endif
+	xor %rax, %rax
+	dec %rax
+.Lret:
+	retq
 #endif
 .size	syscall, . - syscall