1#!/bin/sh
2
3# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
4# Use of this source code is governed by a BSD-style license that can be
5# found in the LICENSE file.
6
7# Generates a header file with a system call table made up of "name",
8# syscall_nr entries by including the build target <asm/unistd.h> and
9# emitting the list of defines.  Use of the compiler is needed to
10# dereference the actual provider of syscall definitions.
11#   E.g., asm/unistd_32.h or asm/unistd_64.h, etc.
12
13set -e
14
15if [ $# -ne 1 ] && [ $# -ne 2 ]; then
16  echo "Usage: $(basename "$0") OUTFILE"
17  echo "Usage: $(basename "$0") CC OUTFILE"
18  exit 1
19fi
20
21if [ $# -eq 2 ]; then
22  CC="$1"
23  shift
24fi
25OUTFILE="$1"
26
27# sed expression which extracts system calls that are
28# defined via asm/unistd.h.  It converts them from:
29#  #define __NR_read foo
30# to:
31# #ifdef __NR_read
32#  { "read", __NR_read },
33# #endif
34SED_MULTILINE='s/#define __(ARM_)?(NR_)([[:lower:]0-9_]*) (.*)$/#ifdef __\1\2\3\
35{ "\1\3", __\1\2\3 },\
36#endif/g p;'
37
38cat <<-EOF > "${OUTFILE}"
39/* GENERATED BY MAKEFILE */
40#include <stddef.h>
41#include <asm/unistd.h>
42#include "libsyscalls.h"
43const struct syscall_entry syscall_table[] = {
44$(echo '#include <asm/unistd.h>' | \
45  ${CC} -dD - -E | sed -Ene "${SED_MULTILINE}")
46  { NULL, -1 },
47};
48EOF
49