x86: Machine-readable syscall tables and scripts to process them

Create a simple set of syscall tables and scripts to turn them into
both header files (unistd_*.h) and macros for generating the system
call tables.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/syscalls/syscallhdr.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+in="$1"
+out="$2"
+my_abis=`echo "$3" | tr ',' ' '`
+prefix="$4"
+offset="$5"
+
+fileguard=_ASM_X86_`basename "$out" | sed \
+    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \
+    -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g'`
+
+in_list () {
+    local x
+    for x in $1; do
+	if [ x"$x" = x"$2" ]; then
+	    return 0
+	fi
+    done
+    return 1
+}
+
+grep '^[0-9]' "$in" | sort -n | (
+    echo "#ifndef ${fileguard}"
+    echo "#define ${fileguard} 1"
+    echo ""
+
+    while read nr abi name entry ; do
+	if in_list "$my_abis" "$abi"; then
+	    echo "#define __NR_${prefix}${name}" $((nr+offset))
+        fi
+    done
+
+    echo ""
+    echo "#endif /* ${fileguard} */"
+) > "$out"