#!/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 echo "Cross compiling" CROSS_PATH="$(dirname "$(which "${CROSS_COMPILE}cc")")" CROSS_BASE="$(basename "$CROSS_COMPILE")" [ -z "$CROSS_SHORT" ] && CROSS_SHORT="${CROSS_BASE/-*/}" if [ -z "$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 with known $PATH contents if [ ! -z "$CROSS_COMPILE" ] then if [ ! -e "$AIRLOCK/toybox" ] then echo === Create airlock dir PREFIX="$AIRLOCK" KCONFIG_CONFIG="$TOP"/.airlock CROSS_COMPILE= \ make noroot_clean defconfig toybox install_airlock && rm "$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 "$ROOT/bin" && ln -s usr/sbin "$ROOT/sbin" && ln -s usr/lib "$ROOT/lib" && # init script. Runs as pid 1 from initramfs to set up and hand off system. cat > "$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 mkdir -p dev/pts mountpoint -q dev/pts || mount -t devpts dev/pts dev/pts 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 [ "$(date +%s)" -lt 1000 ] && rdate 10.0.2.2 # or time-b.nist.gov [ "$(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 && # /etc/passwd with two kernel special accounts (root and nobody), and guest user cat > "$ROOT"/etc/passwd << 'EOF' && root::0:0:root:/home/root:/bin/sh guest:x:500:500:guest:/home/guest:/bin/sh nobody:x:65534:65534:nobody:/proc/self:/dev/null EOF # /etc/group with groups corresponding to each /etc/passwd user cat > "$ROOT"/etc/group << 'EOF' && root:x:0: guest:x:500: nobody:x:nobody: EOF # /etc/resolv.conf using Google's public nameserver. echo "nameserver 8.8.8.8" > "$ROOT"/etc/resolv.conf || exit 1 # Build toybox make noroot_clean >/dev/null if [ -z .config ] then echo "Building defconfig" make defconfig # Work around musl-libc design flaw [ "${CROSS_BASE/fdpic//}" != "$CROSS_BASE" ] && sed -i 's/.*\(CONFIG_TOYBOX_MUSL_NOMMU_IS_BROKEN\).*/\1=y/' .config fi LDFLAGS=--static PREFIX="$ROOT" make toybox install || exit 1 # Abort early if no kernel source specified if [ -z "$LINUX" ] || [ ! -d "$LINUX/kernel" ] then echo 'No $LINUX directory, kernel build skipped.' rmdir "$MYBUILD" "$BUILD" 2>/dev/null exit 0 fi # Which architecture are we building a kernel for? [ -z "$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="qemu-system-arm -M versatilepb -net nic,model=rtl8139 -net user" KARCH=arm KARGS="console=ttyAMA0" VMLINUX=arch/arm/boot/zImage KERNEL_CONFIG=" CONFIG_CPU_ARM926T=y CONFIG_MMU=y CONFIG_VFP=y CONFIG_ARM_THUMB=y CONFIG_AEABI=y CONFIG_ARCH_VERSATILE=y # The switch to device-tree-only added this mess CONFIG_ATAGS=y CONFIG_DEPRECATED_PARAM_STRUCT=y CONFIG_ARM_ATAG_DTB_COMPAT=y CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND=y CONFIG_SERIAL_AMBA_PL011=y CONFIG_SERIAL_AMBA_PL011_CONSOLE=y CONFIG_RTC_CLASS=y CONFIG_RTC_DRV_PL031=y CONFIG_RTC_HCTOSYS=y CONFIG_PCI=y CONFIG_PCI_VERSATILE=y CONFIG_BLK_DEV_SD=y CONFIG_SCSI=y CONFIG_SCSI_LOWLEVEL=y CONFIG_SCSI_SYM53C8XX_2=y CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0 CONFIG_SCSI_SYM53C8XX_MMIO=y CONFIG_NET_VENDOR_REALTEK=y CONFIG_8139CP=y " DTB=arch/arm/boot/dts/versatile-pb.dtb elif [ "$TARGET" == armv7l ] || [ "$TARGET" == aarch64 ] then if [ "$TARGET" == aarch64 ] then QEMU="qemu-system-aarch64 -M virt -cpu cortex-a57" KARCH=arm64 VMLINUX=arch/arm64/boot/Image else QEMU="qemu-system-arm -M virt" KARCH=arm VMLINUX=arch/arm/boot/zImage fi KARGS="console=ttyAMA0" KERNEL_CONFIG=" CONFIG_MMU=y CONFIG_ARCH_MULTI_V7=y CONFIG_ARCH_VIRT=y CONFIG_SOC_DRA7XX=y CONFIG_ARCH_OMAP2PLUS_TYPICAL=y CONFIG_ARCH_ALPINE=y CONFIG_ARM_THUMB=y CONFIG_VDSO=y CONFIG_CPU_IDLE=y CONFIG_ARM_CPUIDLE=y CONFIG_KERNEL_MODE_NEON=y CONFIG_SERIAL_AMBA_PL011=y CONFIG_SERIAL_AMBA_PL011_CONSOLE=y CONFIG_RTC_CLASS=y CONFIG_RTC_HCTOSYS=y CONFIG_RTC_DRV_PL031=y CONFIG_NET_CORE=y CONFIG_VIRTIO_MENU=y CONFIG_VIRTIO_NET=y CONFIG_PCI=y CONFIG_PCI_HOST_GENERIC=y CONFIG_VIRTIO_BLK=y CONFIG_VIRTIO_PCI=y CONFIG_VIRTIO_MMIO=y CONFIG_ATA=y CONFIG_ATA_SFF=y CONFIG_ATA_BMDMA=y CONFIG_ATA_PIIX=y CONFIG_PATA_PLATFORM=y CONFIG_PATA_OF_PLATFORM=y CONFIG_ATA_GENERIC=y " elif [ "$TARGET" == i486 ] || [ "$TARGET" == i686 ] || [ "$TARGET" == x86_64 ] || [ "$TARGET" == x32 ] then if [ "$TARGET" == i486 ] then QEMU="qemu-system-i386 -cpu 486 -global fw_cfg.dma_enabled=false" KERNEL_CONFIG="CONFIG_M486=y" elif [ "$TARGET" == i686 ] then QEMU="qemu-system-i386 -cpu pentium3" KERNEL_CONFIG="CONFIG_MPENTIUMII=y" else QEMU=qemu-system-x86_64 KERNEL_CONFIG="CONFIG_64BIT=y" [ "$TARGET" == x32 ] && KERNEL_CONFIG="$KERNEL_CONFIG CONFIG_X86_X32=y" fi KARCH=x86 KARGS="console=ttyS0" VMLINUX=arch/x86/boot/bzImage CONFIG_MPENTIUMII=y KERNEL_CONFIG=" $KERNEL_CONFIG CONFIG_UNWINDER_FRAME_POINTER=y CONFIG_PCI=y CONFIG_BLK_DEV_SD=y CONFIG_ATA=y CONFIG_ATA_SFF=y CONFIG_ATA_BMDMA=y CONFIG_ATA_PIIX=y CONFIG_NET_VENDOR_INTEL=y CONFIG_E1000=y CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_RTC_CLASS=y " elif [ "$TARGET" == mips ] || [ "$TARGET" == mipsel ] then QEMU="qemu-system-mips -M malta" KARCH=mips KARGS="console=ttyS0" VMLINUX=vmlinux KERNEL_CONFIG=" CONFIG_MIPS_MALTA=y CONFIG_CPU_MIPS32_R2=y CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_PCI=y CONFIG_BLK_DEV_SD=y CONFIG_ATA=y CONFIG_ATA_SFF=y CONFIG_ATA_BMDMA=y CONFIG_ATA_PIIX=y CONFIG_NET_VENDOR_AMD=y CONFIG_PCNET32=y CONFIG_POWER_RESET=y CONFIG_POWER_RESET_SYSCON=y " [ "$TARGET" == mipsel ] && KERNEL_CONFIG="${KERNEL_CONFIG}CONFIG_CPU_LITTLE_ENDIAN=y" && QEMU="qemu-system-mipsel -M malta" elif [ "$TARGET" == powerpc ] then KARCH=powerpc QEMU="qemu-system-ppc -M g3beige" KARGS="console=ttyS0" VMLINUX=vmlinux KERNEL_CONFIG=" CONFIG_ALTIVEC=y CONFIG_PPC_PMAC=y CONFIG_PPC_OF_BOOT_TRAMPOLINE=y CONFIG_IDE=y CONFIG_IDE_GD=y CONFIG_IDE_GD_ATA=y CONFIG_BLK_DEV_IDE_PMAC=y CONFIG_BLK_DEV_IDE_PMAC_ATA100FIRST=y CONFIG_MACINTOSH_DRIVERS=y CONFIG_ADB=y CONFIG_ADB_CUDA=y CONFIG_NET_VENDOR_NATSEMI=y CONFIG_NET_VENDOR_8390=y CONFIG_NE2K_PCI=y CONFIG_SERIO=y CONFIG_SERIAL_PMACZILOG=y CONFIG_SERIAL_PMACZILOG_TTYS=y CONFIG_SERIAL_PMACZILOG_CONSOLE=y CONFIG_BOOTX_TEXT=y " elif [ "$TARGET" == powerpc64le ] then KARCH=powerpc QEMU="qemu-system-ppc64 -M pseries -vga none" KARGS="console=/dev/hvc0" VMLINUX=vmlinux KERNEL_CONFIG="CONFIG_PPC64=y CONFIG_PPC_PSERIES=y CONFIG_CPU_LITTLE_ENDIAN=y CONFIG_PPC_OF_BOOT_TRAMPOLINE=y CONFIG_BLK_DEV_SD=y CONFIG_SCSI_LOWLEVEL=y CONFIG_SCSI_IBMVSCSI=y CONFIG_ATA=y CONFIG_NET_VENDOR_IBM=y CONFIG_IBMVETH=y CONFIG_HVC_CONSOLE=y # None of this should be necessary CONFIG_PPC_TRANSACTIONAL_MEM=y CONFIG_PPC_DISABLE_WERROR=y CONFIG_SECTION_MISMATCH_WARN_ONLY=y " elif [ "$TARGET" = s390x ] then QEMU="qemu-system-s390x" KARCH=s390 VMLINUX=arch/s390/boot/bzImage KERNEL_CONFIG=" CONFIG_MARCH_Z900=y CONFIG_PACK_STACK=y CONFIG_NET_CORE=y CONFIG_VIRTIO_NET=y CONFIG_VIRTIO_BLK=y CONFIG_SCLP_TTY=y CONFIG_SCLP_CONSOLE=y CONFIG_SCLP_VT220_TTY=y CONFIG_SCLP_VT220_CONSOLE=y CONFIG_S390_GUEST=y " elif [ "$TARGET" == sh4 ] then QEMU="qemu-system-sh4 -M r2d -serial null -serial mon:stdio" KARCH=sh KARGS="console=ttySC1 noiotrap" VMLINUX=arch/sh/boot/zImage KERNEL_CONFIG=" CONFIG_CPU_SUBTYPE_SH7751R=y CONFIG_MMU=y CONFIG_MEMORY_START=0x0c000000 CONFIG_VSYSCALL=y CONFIG_SH_FPU=y CONFIG_SH_RTS7751R2D=y CONFIG_RTS7751R2D_PLUS=y CONFIG_SERIAL_SH_SCI=y CONFIG_SERIAL_SH_SCI_CONSOLE=y CONFIG_PCI=y CONFIG_NET_VENDOR_REALTEK=y CONFIG_8139CP=y CONFIG_PCI=y CONFIG_BLK_DEV_SD=y CONFIG_ATA=y CONFIG_ATA_SFF=y CONFIG_ATA_BMDMA=y CONFIG_PATA_PLATFORM=y CONFIG_BINFMT_ELF_FDPIC=y CONFIG_BINFMT_FLAT=y #CONFIG_SPI=y #CONFIG_SPI_SH_SCI=y #CONFIG_MFD_SM501=y #CONFIG_RTC_CLASS=y #CONFIG_RTC_DRV_R9701=y #CONFIG_RTC_DRV_SH=y #CONFIG_RTC_HCTOSYS=y " else echo "Unknown \$TARGET" exit 1 fi # Write the miniconfig file { echo "# make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG=$TARGET.miniconf" echo "# make ARCH=$KARCH -j \$(nproc)" echo "# boot $VMLINUX" echo echo "$KERNEL_CONFIG" echo " # CONFIG_EMBEDDED is not set CONFIG_EARLY_PRINTK=y CONFIG_BINFMT_ELF=y CONFIG_BINFMT_SCRIPT=y CONFIG_NO_HZ=y CONFIG_HIGH_RES_TIMERS=y CONFIG_BLK_DEV=y CONFIG_BLK_DEV_INITRD=y CONFIG_RD_GZIP=y CONFIG_BLK_DEV_LOOP=y CONFIG_EXT4_FS=y CONFIG_EXT4_USE_FOR_EXT2=y CONFIG_VFAT_FS=y CONFIG_FAT_DEFAULT_UTF8=y CONFIG_MISC_FILESYSTEMS=y CONFIG_SQUASHFS=y CONFIG_SQUASHFS_XATTR=y CONFIG_SQUASHFS_ZLIB=y CONFIG_DEVTMPFS=y CONFIG_DEVTMPFS_MOUNT=y CONFIG_TMPFS=y CONFIG_TMPFS_POSIX_ACL=y CONFIG_NET=y CONFIG_PACKET=y CONFIG_UNIX=y CONFIG_INET=y CONFIG_IPV6=y CONFIG_NETDEVICES=y #CONFIG_NET_CORE=y #CONFIG_NETCONSOLE=y CONFIG_ETHERNET=y " } > "$OUTPUT/miniconfig-$TARGET" # Write the qemu launch script echo "$QEMU -nographic -no-reboot -m 256" \ "-append \"panic=1 HOST=$TARGET $KARGS\"" \ "-kernel $(basename "$VMLINUX") -initrd ${CROSS_BASE}root.cpio.gz" \ ${DTB:+-dtb "$(basename "$DTB")"} '"$@"' \ > "$OUTPUT/qemu-$TARGET.sh" && chmod +x "$OUTPUT/qemu-$TARGET.sh" && echo "Build linux for $KARCH" # Snapshot Linux source dir and clean it cp -sfR "$LINUX" "$MYBUILD/linux" && pushd "$MYBUILD/linux" > /dev/null || exit 1 # Build kernel make distclean && 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 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"