1#!/bin/bash 2 3# ------------------------------ Part 1: Setup ------------------------------- 4 5# Clear environment variables by restarting script w/bare minimum passed through 6[ -z "$NOCLEAR" ] && exec env -i NOCLEAR=1 HOME="$HOME" PATH="$PATH" \ 7 LINUX="$LINUX" CROSS="$CROSS" CROSS_COMPILE="$CROSS_COMPILE" "$0" "$@" 8 9# assign command line NAME=VALUE args to env vars, the rest are packages 10for i in "$@"; do 11 [ "${i/=/}" != "$i" ] && export "$i" || { [ "$i" != -- ] && PKG="$PKG $i"; } 12done 13 14# Set default directory locations (overrideable from command line) 15: ${LOG:=${BUILD:=${TOP:=$PWD/root}/build}/log} ${AIRLOCK:=$BUILD/airlock} 16: ${CCC:=$PWD/ccc} ${PKGDIR:=$PWD/scripts/root} 17 18# define functions 19announce() { printf "\033]2;$CROSS $*\007" >/dev/tty; printf "\n=== $*\n";} 20die() { echo "$@" >&2; exit 1; } 21 22# ----- Are we cross compiling (via CROSS_COMPILE= or CROSS=) 23 24if [ -n "$CROSS_COMPILE" ]; then 25 # airlock needs absolute path 26 [ -z "${X:=$(command -v "$CROSS_COMPILE"cc)}" ] && die "no ${CROSS_COMPILE}cc" 27 CROSS_COMPILE="$(realpath -s "${X%cc}")" 28 [ -z "$CROSS" ] && CROSS=${CROSS_COMPILE/*\//} CROSS=${CROSS/-*/} 29 30elif [ -n "$CROSS" ]; then # CROSS=all/allnonstop/$ARCH else list known $ARCHes 31 [ ! -d "$CCC" ] && die "No ccc symlink to compiler directory." 32 TARGETS="$(ls "$CCC" | sed -n 's/-.*//p' | sort -u)" 33 34 if [ "${CROSS::3}" == all ]; then # loop calling ourselves for each target 35 for i in $TARGETS; do 36 "$0" "$@" CROSS=$i || [ "$CROSS" == allnonstop ] || exit 1 37 done; exit 38 39 else # Find matching cross compiler under ccc/ else list available targets 40 CROSS_COMPILE="$(echo "$CCC/$CROSS"-*cross/bin/"$CROSS"*-cc)" # wildcard 41 [ ! -e "$CROSS_COMPILE" ] && echo $TARGETS && exit # list available targets 42 CROSS_COMPILE="${CROSS_COMPILE%cc}" # trim to prefix for cc/ld/as/nm/strip 43 fi 44fi 45 46# Set per-target output directory (using "host" if not cross-compiling) 47: ${CROSS:=host} ${OUTPUT:=$TOP/$CROSS} 48 49# Verify selected compiler works 50${CROSS_COMPILE}cc --static -xc - -o /dev/null <<< "int main(void){return 0;}"|| 51 die "${CROSS_COMPILE}cc can't create static binaries" 52 53# ----- Create hermetic build environment 54 55if [ -z "$NOAIRLOCK"] && [ -n "$CROSS_COMPILE" ]; then 56 # When cross compiling set host $PATH to binaries with known behavior by 57 # - building a host toybox later builds use as their command line 58 # - cherry-picking specific commands from old path via symlink 59 if [ ! -e "$AIRLOCK/toybox" ]; then 60 announce "airlock" && 61 PREFIX="$AIRLOCK" KCONFIG_CONFIG=.singleconfig_airlock CROSS_COMPILE= \ 62 make clean defconfig toybox install_airlock && # see scripts/install.sh 63 rm .singleconfig_airlock || exit 1 64 fi 65 export PATH="$AIRLOCK" 66fi 67 68# Create per-target work directories 69TEMP="$BUILD/${CROSS}-tmp" && rm -rf "$TEMP" && 70mkdir -p "$TEMP" "$OUTPUT" "$LOG" || exit 1 71[ -z "$ROOT" ] && ROOT="$OUTPUT/fs" && rm -rf "$ROOT" 72 73# ----- log build output 74 75# Install command line recording wrapper, logs all commands run from $PATH 76if [ -z "$NOLOGPATH" ]; then 77 # Move cross compiler into $PATH so calls to it get logged 78 [ -n "$CROSS_COMPILE" ] && PATH="${CROSS_COMPILE%/*}:$PATH" && 79 CROSS_COMPILE=${CROSS_COMPILE##*/} 80 export WRAPDIR="$BUILD/record-commands" LOGPATH="$LOG/$CROSS-commands.txt" 81 rm -rf "$WRAPDIR" "$LOGPATH" generated/obj && 82 WRAPDIR="$WRAPDIR" CROSS_COMPILE= NOSTRIP=1 source scripts/record-commands || 83 exit 1 84fi 85 86# Start logging stdout/stderr 87rm -f "$LOG/$CROSS".{n,y} || exit 1 88[ -z "$NOLOG" ] && exec > >(tee "$LOG/$CROSS.n") 2>&1 89echo "Building for $CROSS" 90 91# ---------------------- Part 2: Create root filesystem ----------------------- 92 93# ----- Create new root filesystem's directory layout. 94 95# FHS wants boot media opt srv usr/{local,share}, stuff under /var... 96mkdir -p "$ROOT"/{dev,etc/rc,home,mnt,proc,root,sys,tmp/run,usr/{bin,sbin,lib},var} && 97chmod a+rwxt "$ROOT"/tmp && ln -s usr/{bin,sbin,lib} tmp/run "$ROOT" || exit 1 98 99# Write init script. Runs as pid 1 from initramfs to set up and hand off system. 100cat > "$ROOT"/init << 'EOF' && 101#!/bin/sh 102 103export HOME=/home PATH=/bin:/sbin 104 105if ! mountpoint -q dev; then 106 mount -t devtmpfs dev dev 107 [ $$ -eq 1 ] && exec 0<>/dev/console 1>&0 2>&1 108 for i in ,fd /0,stdin /1,stdout /2,stderr 109 do ln -sf /proc/self/fd${i/,*/} dev/${i/*,/}; done 110 mkdir -p dev/shm 111 chmod +t /dev/shm 112fi 113mountpoint -q dev/pts || { mkdir -p dev/pts && mount -t devpts dev/pts dev/pts;} 114mountpoint -q proc || mount -t proc proc proc 115mountpoint -q sys || mount -t sysfs sys sys 116echo 0 99999 > /proc/sys/net/ipv4/ping_group_range 117 118if [ $$ -eq 1 ]; then # Setup networking for QEMU (needs /proc) 119 ifconfig lo 127.0.0.1 120 ifconfig eth0 10.0.2.15 121 route add default gw 10.0.2.2 122 [ "$(date +%s)" -lt 1000 ] && timeout 2 sntp -sq 10.0.2.2 # Ask host 123 [ "$(date +%s)" -lt 10000000 ] && sntp -sq time.google.com 124 125 # Run package scripts (if any) 126 for i in $(ls -1 /etc/rc 2>/dev/null | sort); do . /etc/rc/"$i"; done 127 128 [ -z "$CONSOLE" ] && CONSOLE="$(</sys/class/tty/console/active)" 129 [ -z "$HANDOFF" ] && HANDOFF=/bin/sh && echo -e '\e[?7hType exit when done.' 130 echo 3 > /proc/sys/kernel/printk 131 exec oneit -c /dev/"${CONSOLE:-console}" $HANDOFF 132else # for chroot 133 /bin/sh 134 umount /dev/pts /dev /sys /proc 135fi 136EOF 137chmod +x "$ROOT"/init && 138 139# Google's nameserver, passwd+group with special (root/nobody) accounts + guest 140echo "nameserver 8.8.8.8" > "$ROOT"/etc/resolv.conf && 141cat > "$ROOT"/etc/passwd << 'EOF' && 142root:x:0:0:root:/root:/bin/sh 143guest:x:500:500:guest:/home/guest:/bin/sh 144nobody:x:65534:65534:nobody:/proc/self:/dev/null 145EOF 146echo -e 'root:x:0:\nguest:x:500:\nnobody:x:65534:' > "$ROOT"/etc/group || exit 1 147 148# Build any packages listed on command line 149for i in ${PKG:+plumbing $PKG}; do 150 pushd . 151 announce "$i"; PATH="$PKGDIR:$PATH" source $i || die $i 152 popd 153done 154 155# Build static toybox with existing .config if there is one, else defconfig+sh 156announce toybox 157[ ! -z "$PENDING" ] && rm -f .config 158[ -e .config ] && CONF=silentoldconfig || unset CONF 159for i in $PENDING sh route; do XX="$XX"$'\n'CONFIG_${i^^?}=y; done 160[ -e "$ROOT"/lib/libc.so ] || export LDFLAGS=--static 161PREFIX="$ROOT" make clean \ 162 ${CONF:-defconfig KCONFIG_ALLCONFIG=<(echo "$XX")} toybox install || exit 1 163unset LDFLAGS 164 165# ------------------ Part 3: Build + package bootable system ------------------ 166 167# ----- Build kernel for target 168 169if [ -z "$LINUX" ] || [ ! -d "$LINUX/kernel" ]; then 170 echo 'No $LINUX directory, kernel build skipped.' 171else 172 # Which architecture are we building a kernel for? 173 LINUX="$(realpath "$LINUX")" 174 [ -z "$TARGET" ] && 175 { [ "$CROSS" == host ] && TARGET="$(uname -m)" || TARGET="$CROSS"; } 176 177 # Target-specific info in an (alphabetical order) if/else staircase 178 # Each target needs board config, serial console, RTC, ethernet, block device. 179 180 if [ "$TARGET" == armv5l ]; then 181 # This could use the same VIRT board as armv7, but let's demonstrate a 182 # different one requiring a separate device tree binary. 183 QEMU="arm -M versatilepb -net nic,model=rtl8139 -net user" 184 KARCH=arm KARGS=ttyAMA0 VMLINUX=arch/arm/boot/zImage 185 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 186 KERNEL_CONFIG="CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0" 187 DTB=arch/arm/boot/dts/versatile-pb.dtb 188 elif [ "$TARGET" == armv7l ] || [ "$TARGET" == aarch64 ]; then 189 if [ "$TARGET" == aarch64 ]; then 190 QEMU="aarch64 -M virt -cpu cortex-a57" 191 KARCH=arm64 VMLINUX=arch/arm64/boot/Image 192 else 193 QEMU="arm -M virt" KARCH=arm VMLINUX=arch/arm/boot/zImage 194 fi 195 KARGS=ttyAMA0 196 KCONF=MMU,ARCH_MULTI_V7,ARCH_VIRT,SOC_DRA7XX,ARCH_OMAP2PLUS_TYPICAL,ARCH_ALPINE,ARM_THUMB,VDSO,CPU_IDLE,ARM_CPUIDLE,KERNEL_MODE_NEON,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_HCTOSYS,RTC_DRV_PL031,NET_CORE,VIRTIO_MENU,VIRTIO_NET,PCI,PCI_HOST_GENERIC,VIRTIO_BLK,VIRTIO_PCI,VIRTIO_MMIO,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,PATA_PLATFORM,PATA_OF_PLATFORM,ATA_GENERIC,ARM_LPAE 197 elif [ "$TARGET" == hexagon ]; then 198 QEMU="hexagon -M comet" KARGS=ttyS0 VMLINUX=vmlinux 199 KARCH="hexagon LLVM_IAS=1" KCONF=SPI,SPI_BITBANG,IOMMU_SUPPORT 200 elif [ "$TARGET" == i486 ] || [ "$TARGET" == i686 ] || 201 [ "$TARGET" == x86_64 ] || [ "$TARGET" == x32 ]; then 202 if [ "$TARGET" == i486 ]; then 203 QEMU="i386 -cpu 486 -global fw_cfg.dma_enabled=false" KCONF=M486 204 elif [ "$TARGET" == i686 ]; then 205 QEMU="i386 -cpu pentium3" KCONF=MPENTIUMII 206 else 207 QEMU=x86_64 KCONF=64BIT 208 [ "$TARGET" == x32 ] && KCONF=X86_X32 209 fi 210 KARCH=x86 KARGS=ttyS0 VMLINUX=arch/x86/boot/bzImage 211 KCONF=$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 212 elif [ "$TARGET" == m68k ]; then 213 QEMU="m68k -M q800" KARCH=m68k KARGS=ttyS0 VMLINUX=vmlinux 214 KCONF=MMU,M68040,M68KFPU_EMU,MAC,SCSI_MAC_ESP,MACINTOSH_DRIVERS,ADB,ADB_MACII,NET_CORE,NET_VENDOR_NATSEMI,MACSONIC,SERIAL_PMACZILOG,SERIAL_PMACZILOG_TTYS,SERIAL_PMACZILOG_CONSOLE 215 elif [ "$TARGET" == mips ] || [ "$TARGET" == mipsel ]; then 216 QEMU="mips -M malta" KARCH=mips KARGS=ttyS0 VMLINUX=vmlinux 217 KCONF=MIPS_MALTA,CPU_MIPS32_R2,SERIAL_8250,SERIAL_8250_CONSOLE,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_AMD,PCNET32,POWER_RESET,POWER_RESET_SYSCON 218 [ "$TARGET" == mipsel ] && KCONF=$KCONF,CPU_LITTLE_ENDIAN && 219 QEMU="mipsel -M malta" 220 elif [ "$TARGET" == powerpc ]; then 221 KARCH=powerpc QEMU="ppc -M g3beige" KARGS=ttyS0 VMLINUX=vmlinux 222 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 223 elif [ "$TARGET" == powerpc64le ]; then 224 KARCH=powerpc QEMU="ppc64 -M pseries -vga none" KARGS=hvc0 225 VMLINUX=vmlinux 226 KCONF=PPC64,PPC_PSERIES,CPU_LITTLE_ENDIAN,PPC_OF_BOOT_TRAMPOLINE,BLK_DEV_SD,SCSI_LOWLEVEL,SCSI_IBMVSCSI,ATA,NET_VENDOR_IBM,IBMVETH,HVC_CONSOLE,PPC_TRANSACTIONAL_MEM,PPC_DISABLE_WERROR,SECTION_MISMATCH_WARN_ONLY 227 elif [ "$TARGET" = s390x ]; then 228 QEMU="s390x" KARCH=s390 VMLINUX=arch/s390/boot/bzImage 229 KCONF=MARCH_Z900,PACK_STACK,NET_CORE,VIRTIO_NET,VIRTIO_BLK,SCLP_TTY,SCLP_CONSOLE,SCLP_VT220_TTY,SCLP_VT220_CONSOLE,S390_GUEST 230 elif [ "$TARGET" == sh2eb ]; then 231 BUILTIN=1 KARCH=sh VMLINUX=vmlinux 232 KERNEL_CONFIG=$'CONFIG_MEMORY_START=0x10000000\nCONFIG_CMDLINE="console=ttyUL0 earlycon"' 233 KCONF=CPU_SUBTYPE_J2,CPU_BIG_ENDIAN,SH_JCORE_SOC,SMP,BINFMT_ELF_FDPIC,JCORE_EMAC,SERIAL_UARTLITE,SERIAL_UARTLITE_CONSOLE,HZ_100,CMDLINE_OVERWRITE,SPI,SPI_JCORE,MMC,PWRSEQ_SIMPLE,MMC_BLOCK,MMC_SPI 234 elif [ "$TARGET" == sh4 ]; then 235 QEMU="sh4 -M r2d -serial null -serial mon:stdio" KARCH=sh 236 KARGS="ttySC1 noiotrap" VMLINUX=arch/sh/boot/zImage 237 KERNEL_CONFIG="CONFIG_MEMORY_START=0x0c000000" 238 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 239#see also SPI SPI_SH_SCI MFD_SM501 RTC_CLASS RTC_DRV_R9701 RTC_DRV_SH RTC_HCTOSYS 240 else die "Unknown \$TARGET $TARGET" 241 fi 242 243 # Write the qemu launch script 244 if [ -n "$QEMU" ]; then 245 [ -z "$BUILTIN" ] && INITRD="-initrd initramfs.cpio.gz" 246 { echo qemu-system-"$QEMU" '"$@"' $QEMU_MORE -nographic -no-reboot -m 256 \ 247 -kernel linux-kernel $INITRD ${DTB:+-dtb linux.dtb} \ 248 "-append \"panic=1 HOST=$TARGET console=$KARGS \$KARGS\"" && 249 echo "echo -e '\\e[?7h'" 250 } > "$OUTPUT"/run-qemu.sh && 251 chmod +x "$OUTPUT"/run-qemu.sh || exit 1 252 fi 253 254 announce "linux-$KARCH" 255 pushd "$LINUX" && make distclean && popd && 256 cp -sfR "$LINUX" "$TEMP/linux" && pushd "$TEMP/linux" && 257 # Fix x86-64 and sh2eb 258 sed -Eis '/select HAVE_(STACK_VALIDATION|OBJTOOL)/d' arch/x86/Kconfig && 259 sed -is 's/depends on !SMP/& || !MMU/' mm/Kconfig && 260 261 # Write linux-miniconfig 262 { echo "# make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG=linux-miniconfig" 263 echo -e "# make ARCH=$KARCH -j \$(nproc)\n# boot $VMLINUX\n\n" 264 echo "# CONFIG_EMBEDDED is not set" 265 266 # Expand list of =y symbols, first generic then architecture-specific 267 for i in 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,COMPAT_32BIT_TIME,EARLY_PRINTK,IKCONFIG,IKCONFIG_PROC $KCONF $KEXTRA ; do 268 echo "# architecture ${X:-independent}" 269 sed -E '/^$/d;s/([^,]*)($|,)/CONFIG_\1=y\n/g' <<< "$i" 270 X=specific 271 done 272 [ -n "$BUILTIN" ] && echo -e CONFIG_INITRAMFS_SOURCE="\"$OUTPUT/fs\"" 273 echo "$KERNEL_CONFIG" 274 } > "$OUTPUT/linux-miniconfig" && 275 make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG="$OUTPUT/linux-miniconfig" && 276 277 # Second config pass to remove stupid kernel defaults 278 # See http://lkml.iu.edu/hypermail/linux/kernel/1912.3/03493.html 279 sed -e 's/# CONFIG_EXPERT .*/CONFIG_EXPERT=y/' -e "$(sed -E -e '/^$/d' \ 280 -e 's@([^,]*)($|,)@/^CONFIG_\1=y/d;$a# CONFIG_\1 is not set\n@g' \ 281 <<< VT,SCHED_DEBUG,DEBUG_MISC,X86_DEBUG_FPU)" -i .config && 282 yes "" | make ARCH=$KARCH oldconfig > /dev/null && 283 cp .config "$OUTPUT/linux-fullconfig" && 284 285 # Build kernel. Copy config, device tree binary, and kernel binary to output 286 make ARCH=$KARCH CROSS_COMPILE="$CROSS_COMPILE" -j $(nproc) || exit 1 287 [ -n "$DTB" ] && { cp "$DTB" "$OUTPUT/linux.dtb" || exit 1 ;} 288 cp "$VMLINUX" "$OUTPUT"/linux-kernel && cd .. && rm -rf linux && popd ||exit 1 289fi 290 291# clean up and package root filesystem for initramfs. 292if [ -z "$BUILTIN" ]; then 293 announce initramfs 294 (cd "$ROOT" && find . | cpio -o -H newc ${CROSS_COMPILE:+--no-preserve-owner}\ 295 | gzip) > "$OUTPUT"/initramfs.cpio.gz || exit 1 296fi 297 298mv "$LOG/$CROSS".{n,y} 299rmdir "$TEMP" "$BUILD" 2>/dev/null || exit 0 # remove if empty, not an error 300