--- /dev/null
+
+ .section ".data"
+ .globl linux_errno
+
+linux_errno: .int 0
+
+ .section ".text"
+ .code64
+ .globl linux_syscall
+ .type linux_syscall, @function
+
+linux_syscall:
+ movq %rdi, %rax // C arg1 -> syscall number
+ movq %rsi, %rdi // C arg2 -> syscall arg1
+ movq %rdx, %rsi // C arg3 -> syscall arg2
+ movq %rcx, %rdx // C arg4 -> syscall arg3
+ movq %r8, %r10 // C arg5 -> syscall arg4
+ movq %r9, %r8 // C arg6 -> syscall arg5
+ movq 8(%rsp), %r9 // C arg7 -> syscall arg6
+
+ syscall
+
+ cmpq $-4095, %rax
+ jae 1f
+ ret
+
+1:
+ negq %rax
+ movl %eax, linux_errno
+ movq $-1, %rax
+ ret
+
+ .size linux_syscall, . - linux_syscall