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