#!/bin/bash # Clear environment variables by restarting script w/bare minimum passed through [ -z "$NOCLEAR" ] && exec env -i NOCLEAR=1 HOME="$HOME" PATH="$PATH" LINUX="$LINUX" \ CROSS_COMPILE="$CROSS_COMPILE" CROSS_SHORT="$CROSS_SHORT" "$0" "$@" # assign command line NAME=VALUE args to env vars while [ $# -ne 0 ]; do X="${1/=*/}" Y="${1#*=}" [ "${1/=/}" != "$1" ] && eval "export $X=\"\$Y\"" || echo "unknown $i" shift done # If we're cross compiling, set appropriate environment variables. if [ -z "$CROSS_COMPILE" ]; then echo "Building natively" if ! cc --static -xc - -o /dev/null <<< "int main(void) {return 0;}"; then echo "Warning: host compiler can't create static binaries." >&2 sleep 3 fi else CROSS_PATH="$(dirname "$(which "${CROSS_COMPILE}cc")")" CROSS_BASE="$(basename "$CROSS_COMPILE")" [ -z "$CROSS_SHORT" ] && CROSS_SHORT="${CROSS_BASE/-*/}" echo "Cross compiling to $CROSS_SHORT" if [ -z "$CROSS_PATH" ]; then echo "no ${CROSS_COMPILE}cc in path" >&2 exit 1 fi fi # set up directories (can override most of these paths on cmdline) TOP="$PWD/root" [ -z "$BUILD" ] && BUILD="$TOP/build" [ -z "$AIRLOCK" ] && AIRLOCK="$TOP/airlock" [ -z "$OUTPUT" ] && OUTPUT="$TOP/${CROSS_SHORT:-host}" [ -z "$ROOT" ] && ROOT="$OUTPUT/${CROSS_BASE}fs" && rm -rf "$ROOT" MYBUILD="$BUILD/${CROSS_BASE:-host-}tmp" rm -rf "$MYBUILD" && mkdir -p "$MYBUILD" || exit 1 # Stabilize cross compiling by providing known $PATH contents if [ ! -z "$CROSS_COMPILE" ]; then if [ ! -e "$AIRLOCK/toybox" ]; then echo === Create airlock dir PREFIX="$AIRLOCK" KCONFIG_CONFIG="$TOP"/.airlock CROSS_COMPILE= \ make clean defconfig toybox install_airlock && rm "$TOP"/.airlock || exit 1 fi export PATH="$CROSS_PATH:$AIRLOCK" fi ### Create files and directories mkdir -p "$ROOT"/{etc,tmp,proc,sys,dev,home,mnt,root,usr/{bin,sbin,lib},var} && chmod a+rwxt "$ROOT"/tmp && ln -s usr/{bin,sbin,lib} "$ROOT" || exit 1 # init script. Runs as pid 1 from initramfs to set up and hand off system. cat > "$ROOT"/init << 'EOF' && #!/bin/sh export HOME=/home export PATH=/bin:/sbin mountpoint -q proc || mount -t proc proc proc mountpoint -q sys || mount -t sysfs sys sys if ! mountpoint -q dev; then mount -t devtmpfs dev dev || mdev -s for i in ,fd /0,stdin /1,stdout /2,stderr do ln -sf /proc/self/fd${i/,*/} dev/${i/*,/}; done mkdir -p dev/{shm,pts} mountpoint -q dev/pts || mount -t devpts dev/pts dev/pts chmod +t /dev/shm fi if [ $$ -eq 1 ]; then # Setup networking for QEMU (needs /proc) ifconfig eth0 10.0.2.15 route add default gw 10.0.2.2 [ "$(date +%s)" -lt 1000 ] && rdate 10.0.2.2 # Ask QEMU what time it is [ "$(date +%s)" -lt 10000000 ] && ntpd -nq -p north-america.pool.ntp.org [ -z "$CONSOLE" ] && CONSOLE="$(sed -n 's@.* console=\(/dev/\)*\([^ ]*\).*@\2@p' /proc/cmdline)" [ -z "$HANDOFF" ] && HANDOFF=/bin/sh && echo Type exit when done. [ -z "$CONSOLE" ] && CONSOLE=console exec /sbin/oneit -c /dev/"$CONSOLE" $HANDOFF else /bin/sh umount /dev/pts /dev /sys /proc fi EOF chmod +x "$ROOT"/init && # passwd and group with kernel special accounts (root and nobody) + guest user cat > "$ROOT"/etc/passwd << 'EOF' && root::0:0:root:/root:/bin/sh guest:x:500:500:guest:/home/guest:/bin/sh nobody:x:65534:65534:nobody:/proc/self:/dev/null EOF echo -e 'root:x:0:\nguest:x:500:\nnobody:x:65534:' > "$ROOT"/etc/group && # /etc/resolv.conf using Google's public nameserver. (We could use QEMU's # 10.0.2.2 forwarder here, but this way works in both chroot and QEMU.) echo "nameserver 8.8.8.8" > "$ROOT"/etc/resolv.conf || exit 1 # Build toybox make clean if [ -z .config ]; then make defconfig # Work around musl-libc design flaw. [ "${CROSS_BASE/fdpic//}" != "$CROSS_BASE" ] && sed -i 's/.*\(CONFIG_TOYBOX_MUSL_NOMMU_IS_BROKEN\).*/\1=y/' .config else make silentoldconfig fi LDFLAGS=--static PREFIX="$ROOT" make toybox install || exit 1 write_miniconfig() { # Generic options for all targets KCGLOB=EARLY_PRINTK,BINFMT_ELF,BINFMT_SCRIPT,NO_HZ,HIGH_RES_TIMERS,BLK_DEV,BLK_DEV_INITRD,RD_GZIP,BLK_DEV_LOOP,EXT4_FS,EXT4_USE_FOR_EXT2,VFAT_FS,FAT_DEFAULT_UTF8,MISC_FILESYSTEMS,SQUASHFS,SQUASHFS_XATTR,SQUASHFS_ZLIB,DEVTMPFS,DEVTMPFS_MOUNT,TMPFS,TMPFS_POSIX_ACL,NET,PACKET,UNIX,INET,IPV6,NETDEVICES,NET_CORE,NETCONSOLE,ETHERNET echo "# make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG=$TARGET.miniconf" echo "# make ARCH=$KARCH -j \$(nproc)" echo "# boot $VMLINUX" echo echo "# CONFIG_EMBEDDED is not set" # Expand list of =y symbols for i in $KCGLOB $KCONF; do echo "# architecture ${X:-independent}" sed -E '/^$/d;s/([^,]*)($|,)/CONFIG_\1=y\n/g' <<< "$i" X=specific done echo "$KERNEL_CONFIG" } if [ -z "$LINUX" ] || [ ! -d "$LINUX/kernel" ]; then echo 'No $LINUX directory, kernel build skipped.' else # Which architecture are we building a kernel for? [ -z "$TARGET" ] && TARGET="${CROSS_BASE/-*/}" [ -z "$TARGET" ] && TARGET="$(uname -m)" # Target-specific info in an (alphabetical order) if/else staircase # Each target needs board config, serial console, RTC, ethernet, block device. if [ "$TARGET" == armv5l ]; then # This could use the same VIRT board as armv7, but let's demonstrate a # different one requiring a separate device tree binary. QEMU="arm -M versatilepb -net nic,model=rtl8139 -net user" KARCH=arm KARGS="console=ttyAMA0" VMLINUX=arch/arm/boot/zImage KCONF=CPU_ARM926T,MMU,VFP,ARM_THUMB,AEABI,ARCH_VERSATILE,ATAGS,DEPRECATED_PARAM_STRUCT,ARM_ATAG_DTB_COMPAT,ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_DRV_PL031,RTC_HCTOSYS,PCI,PCI_VERSATILE,BLK_DEV_SD,SCSI,SCSI_LOWLEVEL,SCSI_SYM53C8XX_2,SCSI_SYM53C8XX_MMIO,NET_VENDOR_REALTEK,8139CP KERNEL_CONFIG="CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0" DTB=arch/arm/boot/dts/versatile-pb.dtb elif [ "$TARGET" == armv7l ] || [ "$TARGET" == aarch64 ]; then if [ "$TARGET" == aarch64 ]; then QEMU="aarch64 -M virt -cpu cortex-a57" KARCH=arm64 VMLINUX=arch/arm64/boot/Image else QEMU="arm -M virt" KARCH=arm VMLINUX=arch/arm/boot/zImage fi KARGS="console=ttyAMA0" KCONF=MMU,ARCH_MULTI_V7,ARCH_VIRT,SOC_DRA7XX,ARCH_OMAP2PLUS_TYPICAL,ARCH_ALPINE,ARM_THUMB,VDSO,CPU_IDLE,ARM_CPUIDLE,KERNEL_MODE_NEON,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_HCTOSYS,RTC_DRV_PL031,NET_CORE,VIRTIO_MENU,VIRTIO_NET,PCI,PCI_HOST_GENERIC,VIRTIO_BLK,VIRTIO_PCI,VIRTIO_MMIO,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,PATA_PLATFORM,PATA_OF_PLATFORM,ATA_GENERIC elif [ "$TARGET" == i486 ] || [ "$TARGET" == i686 ] || [ "$TARGET" == x86_64 ] || [ "$TARGET" == x32 ]; then if [ "$TARGET" == i486 ]; then QEMU="i386 -cpu 486 -global fw_cfg.dma_enabled=false" KCONF=M486 elif [ "$TARGET" == i686 ]; then QEMU="i386 -cpu pentium3" KCONF=MPENTIUMII else QEMU=x86_64 KCONF=64BIT [ "$TARGET" == x32 ] && KCONF=X86_X32 fi KARCH=x86 KARGS="console=ttyS0" VMLINUX=arch/x86/boot/bzImage KCONF=$KCONF,UNWINDER_FRAME_POINTER,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_INTEL,E1000,SERIAL_8250,SERIAL_8250_CONSOLE,RTC_CLASS elif [ "$TARGET" == mips ] || [ "$TARGET" == mipsel ]; then QEMU="mips -M malta" KARCH=mips KARGS="console=ttyS0" VMLINUX=vmlinux KCONF=MIPS_MALTA,CPU_MIPS32_R2,SERIAL_8250,SERIAL_8250_CONSOLE,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_AMD,PCNET32,POWER_RESET,POWER_RESET_SYSCON [ "$TARGET" == mipsel ] && KCONF=$KCONF,CPU_LITTLE_ENDIAN && QEMU="mipsel -M malta" elif [ "$TARGET" == powerpc ]; then KARCH=powerpc QEMU="ppc -M g3beige" KARGS="console=ttyS0" VMLINUX=vmlinux KCONF=ALTIVEC,PPC_PMAC,PPC_OF_BOOT_TRAMPOLINE,IDE,IDE_GD,IDE_GD_ATA,BLK_DEV_IDE_PMAC,BLK_DEV_IDE_PMAC_ATA100FIRST,MACINTOSH_DRIVERS,ADB,ADB_CUDA,NET_VENDOR_NATSEMI,NET_VENDOR_8390,NE2K_PCI,SERIO,SERIAL_PMACZILOG,SERIAL_PMACZILOG_TTYS,SERIAL_PMACZILOG_CONSOLE,BOOTX_TEXT elif [ "$TARGET" == powerpc64le ]; then KARCH=powerpc QEMU="ppc64 -M pseries -vga none" KARGS="console=/dev/hvc0" VMLINUX=vmlinux KCONF=PPC64,PPC_PSERIES,CPU_LITTLE_ENDIAN,PPC_OF_BOOT_TRAMPOLINE,BLK_DEV_SD,SCSI_LOWLEVEL,SCSI_IBMVSCSI,ATA,NET_VENDOR_IBM,IBMVETH,HVC_CONSOLE,PPC_TRANSACTIONAL_MEM,PPC_DISABLE_WERROR,SECTION_MISMATCH_WARN_ONLY elif [ "$TARGET" = s390x ] ; then QEMU="s390x" KARCH=s390 VMLINUX=arch/s390/boot/bzImage KCONF=MARCH_Z900,PACK_STACK,NET_CORE,VIRTIO_NET,VIRTIO_BLK,SCLP_TTY,SCLP_CONSOLE,SCLP_VT220_TTY,SCLP_VT220_CONSOLE,S390_GUEST elif [ "$TARGET" == sh4 ] ; then QEMU="sh4 -M r2d -serial null -serial mon:stdio" KARCH=sh KARGS="console=ttySC1 noiotrap" VMLINUX=arch/sh/boot/zImage KERNEL_CONFIG="CONFIG_MEMORY_START=0x0c000000" KCONF=CPU_SUBTYPE_SH7751R,MMU,VSYSCALL,SH_FPU,SH_RTS7751R2D,RTS7751R2D_PLUS,SERIAL_SH_SCI,SERIAL_SH_SCI_CONSOLE,PCI,NET_VENDOR_REALTEK,8139CP,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,PATA_PLATFORM,BINFMT_ELF_FDPIC,BINFMT_FLAT #CONFIG_SPI=y #CONFIG_SPI_SH_SCI=y #CONFIG_MFD_SM501=y #CONFIG_RTC_CLASS=y #CONFIG_RTC_DRV_R9701=y #CONFIG_RTC_DRV_SH=y #CONFIG_RTC_HCTOSYS=y else echo "Unknown \$TARGET" exit 1 fi # Write the qemu launch script echo "qemu-system-$QEMU" '"$@"' -nographic -no-reboot -m 256 \ "-kernel $(basename "$VMLINUX") -initrd ${CROSS_BASE}root.cpio.gz" \ "-append \"panic=1 HOST=$TARGET $KARGS \$KARGS\"" \ ${DTB:+-dtb "$(basename "$DTB")"} > "$OUTPUT/qemu-$TARGET.sh" && chmod +x "$OUTPUT/qemu-$TARGET.sh" && echo "Build linux for $KARCH" cp -sfR "$LINUX" "$MYBUILD/linux" && pushd "$MYBUILD/linux" || exit 1 make distclean && write_miniconfig > "$OUTPUT/miniconfig-$TARGET" && make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG="$OUTPUT/miniconfig-$TARGET" && make ARCH=$KARCH CROSS_COMPILE="$CROSS_COMPILE" -j $(nproc) || exit 1 # If we have a device tree binary, save it for QEMU. if [ ! -z "$DTB" ]; then cp "$DTB" "$OUTPUT/$(basename "$DTB")" || exit 1 fi cp "$VMLINUX" "$OUTPUT/$(basename "$VMLINUX")" && cd .. && rm -rf linux && popd || exit 1 fi rmdir "$MYBUILD" "$BUILD" 2>/dev/null # package root filesystem for initramfs. # we do it here so module install can add files (not implemented yet) echo === create "${CROSS_BASE}root.cpio.gz" (cd "$ROOT" && find . | cpio -o -H newc | gzip) > \ "$OUTPUT/${CROSS_BASE}root.cpio.gz"