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#!/bin/sh
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Generates a header file with a system call table made up of "name",
# syscall_nr entries by including the build target <asm/unistd.h> and
# emitting the list of defines. Use of the compiler is needed to
# dereference the actual provider of syscall definitions.
# E.g., asm/unistd_32.h or asm/unistd_64.h, etc.
set -e
if [ $# -ne 1 ] && [ $# -ne 3 ]; then
echo "Usage: $(basename "$0") OUTFILE"
echo "Usage: $(basename "$0") CC CFLAGS OUTFILE"
exit 1
fi
if [ $# -eq 3 ]; then
CC="$1"
shift
CFLAGS="$1"
shift
fi
OUTFILE="$1"
# sed expression which extracts system calls that are
# defined via asm/unistd.h. It converts them from:
# #define __NR_read foo
# to:
# #ifdef __NR_read
# { "read", __NR_read },
# #endif
SED_MULTILINE='s/#define __(ARM_)?(NR_)([a-z0-9_]*) (.*)$/#ifdef __\1\2\3\
{ "\1\3", __\1\2\3 },\n#endif/g p;'
cat <<-EOF > "${OUTFILE}"
/* GENERATED BY MAKEFILE */
#include <stddef.h>
#include <asm/unistd.h>
#include "libsyscalls.h"
const struct syscall_entry syscall_table[] = {
$(echo '#include <asm/unistd.h>' | \
${CC} ${CFLAGS} -dD - -E | sed -rne "${SED_MULTILINE}")
{ NULL, -1 },
};
EOF
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