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|
#!/bin/sh
#
# A small script used to rebuild the Android goldfish kernel image
# See docs/KERNEL.TXT for usage instructions.
#
MACHINE=goldfish
VARIANT=goldfish
OUTPUT=/tmp/kernel-qemu
CROSSPREFIX=arm-eabi-
CONFIG=goldfish
# Determine the host architecture, and which default prebuilt tag we need.
# For the toolchain auto-detection.
#
HOST_OS=`uname -s`
case "$HOST_OS" in
Darwin)
HOST_OS=darwin
HOST_TAG=darwin-x86
BUILD_NUM_CPUS=$(sysctl -n hw.ncpu)
;;
Linux)
# note that building 32-bit binaries on x86_64 is handled later
HOST_OS=linux
HOST_TAG=linux-x86
BUILD_NUM_CPUS=$(grep -c processor /proc/cpuinfo)
;;
*)
echo "ERROR: Unsupported OS: $HOST_OS"
exit 1
esac
# Default number of parallel jobs during the build: cores * 2
JOBS=$(( $BUILD_NUM_CPUS * 2 ))
ARCH=arm
OPTION_HELP=no
OPTION_ARMV7=no
OPTION_OUT=
OPTION_CROSS=
OPTION_ARCH=
OPTION_CONFIG=
OPTION_JOBS=
for opt do
optarg=$(expr "x$opt" : 'x[^=]*=\(.*\)')
case $opt in
--help|-h|-\?) OPTION_HELP=yes
;;
--armv7)
OPTION_ARMV7=yes
;;
--out=*)
OPTION_OUT=$optarg
;;
--cross=*)
OPTION_CROSS=$optarg
;;
--arch=*)
OPTION_ARCH=$optarg
;;
--config=*)
OPTION_CONFIG=$optarg
;;
-j*)
OPTION_JOBS=$optarg
;;
*)
echo "unknown option '$opt', use --help"
exit 1
esac
done
if [ $OPTION_HELP = "yes" ] ; then
echo "Rebuild the prebuilt kernel binary for Android's emulator."
echo ""
echo "options (defaults are within brackets):"
echo ""
echo " --help print this message"
echo " --arch=<arch> change target architecture [$ARCH]"
echo " --armv7 build ARMv7 binaries (see note below)"
echo " --out=<directory> output directory [$OUTPUT]"
echo " --cross=<prefix> cross-toolchain prefix [$CROSSPREFIX]"
echo " --config=<name> kernel config name [$CONFIG]"
echo " -j<number> launch <number> parallel build jobs [$JOBS]"
echo ""
echo "NOTE: --armv7 is equivalent to --config=goldfish_armv7. It is"
echo " ignored if --config=<name> is used."
echo ""
exit 0
fi
if [ -n "$OPTION_ARCH" ]; then
ARCH=$OPTION_ARCH
fi
if [ -n "$OPTION_CONFIG" ]; then
CONFIG=$OPTION_CONFIG
else
if [ "$OPTION_ARMV7" = "yes" ]; then
CONFIG=goldfish_armv7
fi
echo "Auto-config: --config=$CONFIG"
fi
# Check that we are in the kernel directory
if [ ! -d arch/$ARCH/mach-$MACHINE ] ; then
echo "Cannot find arch/$ARCH/mach-$MACHINE. Please cd to the kernel source directory."
echo "Aborting."
#exit 1
fi
# Check output directory.
if [ -n "$OPTION_OUT" ] ; then
if [ ! -d "$OPTION_OUT" ] ; then
echo "Output directory '$OPTION_OUT' does not exist ! Aborting."
exit 1
fi
OUTPUT=$OPTION_OUT
else
mkdir -p $OUTPUT
fi
if [ -n "$OPTION_CROSS" ] ; then
CROSSPREFIX="$OPTION_CROSS"
else
case $ARCH in
arm)
CROSSTOOLCHAIN=arm-eabi-4.4.3
CROSSPREFIX=arm-eabi-
;;
x86)
CROSSTOOLCHAIN=i686-android-linux-4.4.3
CROSSPREFIX=i686-android-linux-
;;
*)
echo "ERROR: Unsupported architecture!"
exit 1
;;
esac
echo "Auto-config: --cross=$CROSSPREFIX"
fi
ZIMAGE=zImage
case $ARCH in
x86)
ZIMAGE=bzImage
;;
esac
# If the cross-compiler is not in the path, try to find it automatically
CROSS_COMPILER="${CROSSPREFIX}gcc"
CROSS_COMPILER_VERSION=$($CROSS_COMPILER --version 2>/dev/null)
if [ $? != 0 ] ; then
BUILD_TOP=$ANDROID_BUILD_TOP
if [ -z "$BUILD_TOP" ]; then
# Assume this script is under external/qemu/distrib/ in the
# Android source tree.
BUILD_TOP=$(dirname $0)/../../..
if [ ! -d "$BUILD_TOP/prebuilt" ]; then
BUILD_TOP=
else
BUILD_TOP=$(cd $BUILD_TOP && pwd)
fi
fi
CROSSPREFIX=$BUILD_TOP/prebuilt/$HOST_TAG/toolchain/$CROSSTOOLCHAIN/bin/$CROSSPREFIX
if [ "$BUILD_TOP" -a -f ${CROSSPREFIX}gcc ]; then
echo "Auto-config: --cross=$CROSSPREFIX"
else
echo "It looks like $CROSS_COMPILER is not in your path ! Aborting."
exit 1
fi
fi
export CROSS_COMPILE="$CROSSPREFIX" ARCH SUBARCH=$ARCH
if [ "$OPTION_JOBS" ]; then
JOBS=$OPTION_JOBS
else
echo "Auto-config: -j$JOBS"
fi
# Special magic redirection with our magic toolbox script
# This is needed to add extra compiler flags for x86
#
# We could use that for ARM, but don't need to at the moment.
#
if [ "$ARCH" = "x86" ]; then
export REAL_CROSS_COMPILE="$CROSS_COMPILE"
export ARCH
CROSS_COMPILE=$(dirname "$0")/kernel-toolchain/android-kernel-toolchain-
fi
# Do the build
#
rm -f include/asm &&
make ${CONFIG}_defconfig && # configure the kernel
make -j$JOBS # build it
if [ $? != 0 ] ; then
echo "Could not build the kernel. Aborting !"
exit 1
fi
# Note: The exact names of the output files are important for the Android build,
# do not change the definitions lightly.
case $CONFIG in
vbox*)
OUTPUT_KERNEL=kernel-vbox
OUTPUT_VMLINUX=vmlinux-vbox
;;
goldfish)
OUTPUT_KERNEL=kernel-qemu
OUTPUT_VMLINUX=vmlinux-qemu
;;
goldfish_armv7)
OUTPUT_KERNEL=kernel-qemu-armv7
OUTPUT_VMLINUX=vmlinux-qemu-armv7
;;
*)
OUTPUT_KERNEL=kernel-$CONFIG
OUTPUT_VMLINUX=vmlinux-$CONFIG
esac
cp -f arch/$ARCH/boot/$ZIMAGE $OUTPUT/$OUTPUT_KERNEL
cp -f vmlinux $OUTPUT/$OUTPUT_VMLINUX
echo "Kernel $CONFIG prebuilt images ($OUTPUT_KERNEL and $OUTPUT_VMLINUX) copied to $OUTPUT successfully !"
exit 0
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