1#!/bin/bash 2 3# Clear environment variables by restarting script w/bare minimum passed through 4[ -z "$NOCLEAR" ] && 5 exec env -i NOCLEAR=1 HOME="$HOME" PATH="$PATH" LINUX="$LINUX" \ 6 CROSS_COMPILE="$CROSS_COMPILE" CROSS_SHORT="$CROSS_SHORT" "$0" "$@" 7 8# assign command line NAME=VALUE args to env vars 9while [ $# -ne 0 ]; do 10 X="${1/=*/}" Y="${1#*=}" 11 [ "${1/=/}" != "$1" ] && eval "export $X=\"\$Y\"" || echo "unknown $i" 12 shift 13done 14 15# If we're cross compiling, set appropriate environment variables. 16if [ -z "$CROSS_COMPILE" ]; then 17 echo "Building natively" 18 if ! cc --static -xc - -o /dev/null <<< "int main(void) {return 0;}"; then 19 echo "Warning: host compiler can't create static binaries." >&2 20 sleep 3 21 fi 22else 23 CROSS_PATH="$(dirname "$(which "${CROSS_COMPILE}cc")")" 24 CROSS_BASE="$(basename "$CROSS_COMPILE")" 25 [ -z "$CROSS_SHORT" ] && CROSS_SHORT="${CROSS_BASE/-*/}" 26 echo "Cross compiling to $CROSS_SHORT" 27 if [ -z "$CROSS_PATH" ]; then 28 echo "no ${CROSS_COMPILE}cc in path" >&2 29 exit 1 30 fi 31fi 32 33# set up directories (can override most of these paths on cmdline) 34TOP="$PWD/root" 35[ -z "$BUILD" ] && BUILD="$TOP/build" 36[ -z "$AIRLOCK" ] && AIRLOCK="$TOP/airlock" 37[ -z "$OUTPUT" ] && OUTPUT="$TOP/${CROSS_SHORT:-host}" 38[ -z "$ROOT" ] && ROOT="$OUTPUT/${CROSS_BASE}fs" && rm -rf "$ROOT" 39MYBUILD="$BUILD/${CROSS_BASE:-host-}tmp" 40rm -rf "$MYBUILD" && mkdir -p "$MYBUILD" || exit 1 41 42# Stabilize cross compiling by providing known $PATH contents 43if [ ! -z "$CROSS_COMPILE" ]; then 44 if [ ! -e "$AIRLOCK/toybox" ]; then 45 echo === Create airlock dir 46 PREFIX="$AIRLOCK" KCONFIG_CONFIG="$TOP"/.airlock CROSS_COMPILE= \ 47 make clean defconfig toybox install_airlock && 48 rm "$TOP"/.airlock || exit 1 49 fi 50 export PATH="$CROSS_PATH:$AIRLOCK" 51fi 52 53### Create files and directories 54mkdir -p "$ROOT"/{etc,tmp,proc,sys,dev,home,mnt,root,usr/{bin,sbin,lib},var} && 55chmod a+rwxt "$ROOT"/tmp && ln -s usr/{bin,sbin,lib} "$ROOT" || exit 1 56 57# init script. Runs as pid 1 from initramfs to set up and hand off system. 58cat > "$ROOT"/init << 'EOF' && 59#!/bin/sh 60 61export HOME=/home PATH=/bin:/sbin 62 63mountpoint -q proc || mount -t proc proc proc 64mountpoint -q sys || mount -t sysfs sys sys 65if ! mountpoint -q dev; then 66 mount -t devtmpfs dev dev || mdev -s 67 for i in ,fd /0,stdin /1,stdout /2,stderr 68 do ln -sf /proc/self/fd${i/,*/} dev/${i/*,/}; done 69 mkdir -p dev/{shm,pts} 70 mountpoint -q dev/pts || mount -t devpts dev/pts dev/pts 71 chmod +t /dev/shm 72fi 73 74if [ $$ -eq 1 ]; then 75 # Setup networking for QEMU (needs /proc) 76 ifconfig eth0 10.0.2.15 77 route add default gw 10.0.2.2 78 [ "$(date +%s)" -lt 1000 ] && rdate 10.0.2.2 # Ask QEMU what time it is 79 [ "$(date +%s)" -lt 10000000 ] && ntpd -nq -p north-america.pool.ntp.org 80 81 [ -z "$CONSOLE" ] && CONSOLE="$(</sys/class/tty/console/active)" 82 [ -z "$HANDOFF" ] && HANDOFF=/bin/sh && echo Type exit when done. 83 exec /sbin/oneit -c /dev/"${CONSOLE:-console}" $HANDOFF 84else 85 /bin/sh 86 umount /dev/pts /dev /sys /proc 87fi 88EOF 89chmod +x "$ROOT"/init && 90 91# passwd and group with kernel special accounts (root and nobody) + guest user 92cat > "$ROOT"/etc/passwd << 'EOF' && 93root::0:0:root:/root:/bin/sh 94guest:x:500:500:guest:/home/guest:/bin/sh 95nobody:x:65534:65534:nobody:/proc/self:/dev/null 96EOF 97echo -e 'root:x:0:\nguest:x:500:\nnobody:x:65534:' > "$ROOT"/etc/group && 98# Google's public nameserver. 99echo "nameserver 8.8.8.8" > "$ROOT"/etc/resolv.conf || exit 1 100 101# Build toybox 102make clean 103make $([ -z .config ] && echo defconfig || echo silentoldconfig) 104LDFLAGS=--static PREFIX="$ROOT" make toybox install || exit 1 105 106write_miniconfig() 107{ 108 # Generic options for all targets 109 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 110 111 echo "# make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG=$TARGET.miniconf" 112 echo "# make ARCH=$KARCH -j \$(nproc)" 113 echo "# boot $VMLINUX" 114 echo 115 echo "# CONFIG_EMBEDDED is not set" 116 117 # Expand list of =y symbols 118 for i in $KCGLOB $KCONF; do 119 echo "# architecture ${X:-independent}" 120 sed -E '/^$/d;s/([^,]*)($|,)/CONFIG_\1=y\n/g' <<< "$i" 121 X=specific 122 done 123 echo "$KERNEL_CONFIG" 124} 125 126if [ -z "$LINUX" ] || [ ! -d "$LINUX/kernel" ]; then 127 echo 'No $LINUX directory, kernel build skipped.' 128else 129 130 # Which architecture are we building a kernel for? 131 [ -z "$TARGET" ] && TARGET="${CROSS_BASE/-*/}" 132 [ -z "$TARGET" ] && TARGET="$(uname -m)" 133 134 # Target-specific info in an (alphabetical order) if/else staircase 135 # Each target needs board config, serial console, RTC, ethernet, block device. 136 137 if [ "$TARGET" == armv5l ]; then 138 139 # This could use the same VIRT board as armv7, but let's demonstrate a 140 # different one requiring a separate device tree binary. 141 QEMU="arm -M versatilepb -net nic,model=rtl8139 -net user" 142 KARCH=arm KARGS=ttyAMA0 VMLINUX=arch/arm/boot/zImage 143 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 144 KERNEL_CONFIG="CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0" 145 DTB=arch/arm/boot/dts/versatile-pb.dtb 146 elif [ "$TARGET" == armv7l ] || [ "$TARGET" == aarch64 ]; then 147 if [ "$TARGET" == aarch64 ]; then 148 QEMU="aarch64 -M virt -cpu cortex-a57" 149 KARCH=arm64 VMLINUX=arch/arm64/boot/Image 150 else 151 QEMU="arm -M virt" KARCH=arm VMLINUX=arch/arm/boot/zImage 152 fi 153 KARGS=ttyAMA0 154 KCONF=MMU,ARCH_MULTI_V7,ARCH_VIRT,SOC_DRA7XX,ARCH_OMAP2PLUS_TYPICAL,ARCH_ALPINE,ARM_THUMB,VDSO,CPU_IDLE,ARM_CPUIDLE,KERNEL_MODE_NEON,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_HCTOSYS,RTC_DRV_PL031,NET_CORE,VIRTIO_MENU,VIRTIO_NET,PCI,PCI_HOST_GENERIC,VIRTIO_BLK,VIRTIO_PCI,VIRTIO_MMIO,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,PATA_PLATFORM,PATA_OF_PLATFORM,ATA_GENERIC 155 elif [ "$TARGET" == i486 ] || [ "$TARGET" == i686 ] || 156 [ "$TARGET" == x86_64 ] || [ "$TARGET" == x32 ]; then 157 if [ "$TARGET" == i486 ]; then 158 QEMU="i386 -cpu 486 -global fw_cfg.dma_enabled=false" KCONF=M486 159 elif [ "$TARGET" == i686 ]; then 160 QEMU="i386 -cpu pentium3" KCONF=MPENTIUMII 161 else 162 QEMU=x86_64 KCONF=64BIT 163 [ "$TARGET" == x32 ] && KCONF=X86_X32 164 fi 165 KARCH=x86 KARGS=ttyS0 VMLINUX=arch/x86/boot/bzImage 166 KCONF=$KCONF,UNWINDER_FRAME_POINTER,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_INTEL,E1000,SERIAL_8250,SERIAL_8250_CONSOLE,RTC_CLASS 167 elif [ "$TARGET" == mips ] || [ "$TARGET" == mipsel ]; then 168 QEMU="mips -M malta" KARCH=mips KARGS=ttyS0 VMLINUX=vmlinux 169 KCONF=MIPS_MALTA,CPU_MIPS32_R2,SERIAL_8250,SERIAL_8250_CONSOLE,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_AMD,PCNET32,POWER_RESET,POWER_RESET_SYSCON 170 [ "$TARGET" == mipsel ] && KCONF=$KCONF,CPU_LITTLE_ENDIAN && 171 QEMU="mipsel -M malta" 172 elif [ "$TARGET" == powerpc ]; then 173 KARCH=powerpc QEMU="ppc -M g3beige" KARGS=ttyS0 VMLINUX=vmlinux 174 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 175 176 elif [ "$TARGET" == powerpc64le ]; then 177 KARCH=powerpc QEMU="ppc64 -M pseries -vga none" KARGS=/dev/hvc0 178 VMLINUX=vmlinux 179 KCONF=PPC64,PPC_PSERIES,CPU_LITTLE_ENDIAN,PPC_OF_BOOT_TRAMPOLINE,BLK_DEV_SD,SCSI_LOWLEVEL,SCSI_IBMVSCSI,ATA,NET_VENDOR_IBM,IBMVETH,HVC_CONSOLE,PPC_TRANSACTIONAL_MEM,PPC_DISABLE_WERROR,SECTION_MISMATCH_WARN_ONLY 180 181 elif [ "$TARGET" = s390x ] ; then 182 QEMU="s390x" KARCH=s390 VMLINUX=arch/s390/boot/bzImage 183 KCONF=MARCH_Z900,PACK_STACK,NET_CORE,VIRTIO_NET,VIRTIO_BLK,SCLP_TTY,SCLP_CONSOLE,SCLP_VT220_TTY,SCLP_VT220_CONSOLE,S390_GUEST 184 elif [ "$TARGET" == sh4 ] ; then 185 QEMU="sh4 -M r2d -serial null -serial mon:stdio" KARCH=sh 186 KARGS="ttySC1 noiotrap" VMLINUX=arch/sh/boot/zImage 187 KERNEL_CONFIG="CONFIG_MEMORY_START=0x0c000000" 188 KCONF=CPU_SUBTYPE_SH7751R,MMU,VSYSCALL,SH_FPU,SH_RTS7751R2D,RTS7751R2D_PLUS,SERIAL_SH_SCI,SERIAL_SH_SCI_CONSOLE,PCI,NET_VENDOR_REALTEK,8139CP,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,PATA_PLATFORM,BINFMT_ELF_FDPIC,BINFMT_FLAT 189#see also SPI SPI_SH_SCI MFD_SM501 RTC_CLASS RTC_DRV_R9701 RTC_DRV_SH RTC_HCTOSYS 190 else 191 echo "Unknown \$TARGET" 192 exit 1 193 fi 194 195 # Write the qemu launch script 196 echo "qemu-system-$QEMU" '"$@"' -nographic -no-reboot -m 256 \ 197 "-kernel $(basename "$VMLINUX") -initrd ${CROSS_BASE}root.cpio.gz" \ 198 "-append \"panic=1 HOST=$TARGET console=$KARGS \$KARGS\"" \ 199 ${DTB:+-dtb "$(basename "$DTB")"} > "$OUTPUT/qemu-$TARGET.sh" && 200 chmod +x "$OUTPUT/qemu-$TARGET.sh" && 201 202 echo "Build linux for $KARCH" 203 pushd "$LINUX" && make distclean && popd && 204 cp -sfR "$LINUX" "$MYBUILD/linux" && pushd "$MYBUILD/linux" || exit 1 205 write_miniconfig > "$OUTPUT/miniconfig-$TARGET" && 206 make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG="$OUTPUT/miniconfig-$TARGET" && 207 make ARCH=$KARCH CROSS_COMPILE="$CROSS_COMPILE" -j $(nproc) || exit 1 208 209 # If we have a device tree binary, save it for QEMU. 210 if [ ! -z "$DTB" ]; then 211 cp "$DTB" "$OUTPUT/$(basename "$DTB")" || exit 1 212 fi 213 214 cp "$VMLINUX" "$OUTPUT/$(basename "$VMLINUX")" && cd .. && rm -rf linux && 215 popd || exit 1 216fi 217 218rmdir "$MYBUILD" "$BUILD" 2>/dev/null 219 220# package root filesystem for initramfs. 221# we do it here so module install can add files (not implemented yet) 222echo === create "${CROSS_BASE}root.cpio.gz" 223 224(cd "$ROOT" && find . | cpio -o -H newc | gzip) > \ 225 "$OUTPUT/${CROSS_BASE}root.cpio.gz" 226