scc

 1#!/bin/sh
 2
 3#
 4# This job is very easy because app and kernel ABI are identical
 5# until the 4th parameter, so we only have to set the syscall
 6# number in rax
 7
 8sed -n "
 9     s/[ 	]*#.*//
10     /$1/p" syscall.lst |
11while read num name nargs
12do
13cat <<EOF > $name.s
14	.file	"$name.s"
15
16	.globl	$name
17$name:
18	`case $nargs in 4|5|6)
19		echo "movq       %rcx,%r10"
20		;;
21	esac`
22	movq	\$$num,%rax
231:	syscall
24	jb	2f
25	retq
26
272:	movq	%rax,(errno)
28	movq	\$-1,%rax
29	retq
30
31	.section .openbsd.syscalls, "a", @progbits
32	.long 1b
33	.long $num
34EOF
35done