ref: dd4c403f9a3e673c0d233ba39c20960f11b104df
dir: /libc/src/sys/qbe-linux/syscall.awk/
# This job is very easy because app and kernel ABI are identical
# until the 4th parameter, so we only have to set the syscall
# number in rax
/^#/ {next}
{name=$2 ".s"
printf "%s:\n" \
"\tmovq\t$%d,%%rax\n" \
"\tsyscall\n" \
"\tret\n",$2, $1 > name
close(name)}