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