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#!/bin/sh
# syscall reporting example for seccomp
#
# Copyright (c) 2012 The Chromium OS Authors <chromium-os-dev@chromium.org>
# Authors:
# Kees Cook <keescook@chromium.org>
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
CC=$1
[ -n "$TARGET_CC_NOCACHE" ] && CC=$TARGET_CC_NOCACHE
echo "#include <asm/unistd.h>"
echo "static const char *__syscall_names[] = {"
echo "#include <sys/syscall.h>" | ${CC} -E -dM - | grep '^#define __NR_[a-z0-9_]\+[ \t].*[0-9].*$' | \
LC_ALL=C sed -r -n -e 's/^\#define[ \t]+__NR_([a-z0-9_]+)[ \t]+([ ()+0-9a-zNR_LSYCABE]+)(.*)/ [\2] = "\1",/p'
echo "};"
extra_syscalls="$(echo "#include <sys/syscall.h>" | ${CC} -E -dM - | sed -r -n -e 's/^#define __ARM_NR_([a-z0-9_]+)/\1/p')"
cat <<EOF
static inline const char *syscall_name(unsigned i) {
if (i < ARRAY_SIZE(__syscall_names))
return __syscall_names[i];
switch (i) {
EOF
echo "$extra_syscalls" | \
LC_ALL=C sed -r -n -e 's/^([a-z0-9_]+)[ \t]+([ ()+0-9a-zNR_LAMBSE]+)(.*)/ case \2: return "\1";/p'
cat <<EOF
default: return (void*)0;
}
}
EOF
cat <<EOF
static inline int syscall_index(unsigned i) {
if (i < ARRAY_SIZE(__syscall_names))
return i;
switch (i) {
EOF
echo "$extra_syscalls" | \
LC_ALL=C perl -ne 'print " case $2: return ARRAY_SIZE(__syscall_names) + ", $. - 1, ";\n" if /^([a-z0-9_]+)[ \t]+([ ()+0-9a-zNR_LAMBSE]+)(.*)/;'
cat <<EOF
default: return -1;
}
}
EOF
cat <<EOF
static inline int syscall_index_to_number(unsigned i) {
if (i < ARRAY_SIZE(__syscall_names))
return i;
switch (i) {
EOF
echo "$extra_syscalls" | \
LC_ALL=C perl -ne 'print " case ARRAY_SIZE(__syscall_names) + ", $. - 1, ": return $2;\n" if /^([a-z0-9_]+)[ \t]+([ ()+0-9a-zNR_LAMBSE]+)(.*)/;'
cat <<EOF
default: return -1;
}
}
EOF
echo "#define SYSCALL_COUNT (ARRAY_SIZE(__syscall_names) + $({ test -n "$extra_syscalls" && echo "$extra_syscalls"; } | wc -l))"
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