Hey
When building u-boot for an ARMv5T platform (versatileqemu_config), the
Ubuntu-packaged Linaro cross-toolchain isn't suitable because it
only offers an ARMv7T2 libgcc. But I'd like the build to fail when
that happens rather than silently generating an u-boot.bin which will
trigger a SIGILL when it hits the first non-ARMv5T instruction.
I heard that gcc/ld are supposed to check this, but I'm not sure how
it's supposed to work; perhaps the way u-boot does its final link
prevents this from working properly?
I tried building u-boot as follows:
make O=obj-broken \
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm \
OPTFLAGS="-marm -march=armv5te" \
versatileqemu_config
make O=obj-broken \
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm \
OPTFLAGS="-marm -march=armv5te" \
-j2
The final link looks like this:
UNDEF_SYM=`arm-linux-gnueabi-objdump -x
/home/lool/git/denx/u-boot/obj-v-broken/board/armltd/versatile/libversatile.o
/home/lool/git/denx/u-boot/obj-v-broken/api/libapi.o
/home/lool/git/denx/u-boot/obj-v-broken/arch/arm/cpu/arm926ejs/libarm926ejs.o
/home/lool/git/denx/u-boot/obj-v-broken/arch/arm/cpu/arm926ejs/versatile/libversatile.o
/home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/libarm.o
/home/lool/git/denx/u-boot/obj-v-broken/common/libcommon.o
/home/lool/git/denx/u-boot/obj-v-broken/disk/libdisk.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/bios_emulator/libatibiosemu.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/block/libblock.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/dma/libdma.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/fpga/libfpga.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/gpio/libgpio.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/hwmon/libhwmon.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/i2c/libi2c.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/input/libinput.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/misc/libmisc.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/mmc/libmmc.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/libmtd.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/nand/libnand.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/onenand/libonenand.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/spi/libspi_flash.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/ubi/libubi.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/net/libnet.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/net/phy/libphy.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/pci/libpci.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/pcmcia/libpcmcia.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/power/libpower.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/rtc/librtc.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/serial/libserial.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/spi/libspi.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/twserial/libtws.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/eth/libusb_eth.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/gadget/libusb_gadget.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/host/libusb_host.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/musb/libusb_musb.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/phy/libusb_phy.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/video/libvideo.o
/home/lool/git/denx/u-boot/obj-v-broken/drivers/watchdog/libwatchdog.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/cramfs/libcramfs.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/ext2/libext2fs.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/fat/libfat.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/fdos/libfdos.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/jffs2/libjffs2.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/reiserfs/libreiserfs.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/ubifs/libubifs.o
/home/lool/git/denx/u-boot/obj-v-broken/fs/yaffs2/libyaffs2.o
/home/lool/git/denx/u-boot/obj-v-broken/lib/libfdt/libfdt.o
/home/lool/git/denx/u-boot/obj-v-broken/lib/libgeneric.o
/home/lool/git/denx/u-boot/obj-v-broken/lib/lzma/liblzma.o
/home/lool/git/denx/u-boot/obj-v-broken/lib/lzo/liblzo.o
/home/lool/git/denx/u-boot/obj-v-broken/lib/zlib/libz.o
/home/lool/git/denx/u-boot/obj-v-broken/net/libnet.o
/home/lool/git/denx/u-boot/obj-v-broken/post/libpost.o | sed -n -e
's/.*\(__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`; cd
/home/lool/git/denx/u-boot/obj-v-broken && arm-linux-gnueabi-ld -pie -T
/home/lool/git/denx/u-boot/obj-v-broken/u-boot.lds -Bstatic -Ttext 0x10000
$UNDEF_SYM arch/arm/cpu/arm926ejs/start.o --start-group api/libapi.o
arch/arm/cpu/arm926ejs/libarm926ejs.o
arch/arm/cpu/arm926ejs/versatile/libversatile.o arch/arm/lib/libarm.o
common/libcommon.o disk/libdisk.o drivers/bios_emulator/libatibiosemu.o
drivers/block/libblock.o drivers/dma/libdma.o drivers/fpga/libfpga.o
drivers/gpio/libgpio.o drivers/hwmon/libhwmon.o drivers/i2c/libi2c.o
drivers/input/libinput.o drivers/misc/libmisc.o drivers/mmc/libmmc.o
drivers/mtd/libmtd.o drivers/mtd/nand/libnand.o
drivers/mtd/onenand/libonenand.o drivers/mtd/spi/libspi_flash.o
drivers/mtd/ubi/libubi.o drivers/net/libnet.o drivers/net/phy/libphy.o
drivers/pci/libpci.o drivers/pcmcia/libpcmcia.o drivers/power/libpower.o
drivers/rtc/librtc.o drivers/serial/libserial.o drivers/spi/libspi.o
drivers/twserial/libtws.o drivers/usb/eth/libusb_eth.o
drivers/usb/gadget/libusb_gadget.o drivers/usb/host/libusb_host.o
drivers/usb/musb/libusb_musb.o drivers/usb/phy/libusb_phy.o
drivers/video/libvideo.o drivers/watchdog/libwatchdog.o fs/cramfs/libcramfs.o
fs/ext2/libext2fs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o
fs/reiserfs/libreiserfs.o fs/ubifs/libubifs.o fs/yaffs2/libyaffs2.o
lib/libfdt/libfdt.o lib/libgeneric.o lib/lzma/liblzma.o lib/lzo/liblzo.o
lib/zlib/libz.o net/libnet.o post/libpost.o
board/armltd/versatile/libversatile.o --end-group
/home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/eabi_compat.o -L
/usr/lib/gcc/arm-linux-gnueabi/4.6.1 -lgcc -Map u-boot.map -o u-boot
I verified that all the .o files passed above have Tag_CPU_name:
"5TE" in their arm-linux-gnueabi-readelf -A output; the only
problematic file is -lgcc.
Note that the final link is done with arm-linux-gnueabi-ld and doesn't
set any architecture; I changed it manually to use gcc and pass the
-marm -march=armv5te, and had to set -nostdlib too when using gcc:
arm-linux-gnueabi-gcc -marm -march=armv5te -nostdlib -pie -T
/home/lool/git/denx/u-boot/obj-v-broken/u-boot.lds -Bstatic -Ttext 0x10000
$UNDEF_SYM arch/arm/cpu/arm926ejs/start.o -Wl,--start-group api/libapi.o
arch/arm/cpu/arm926ejs/libarm926ejs.o
arch/arm/cpu/arm926ejs/versatile/libversatile.o arch/arm/lib/libarm.o
common/libcommon.o disk/libdisk.o drivers/bios_emulator/libatibiosemu.o
drivers/block/libblock.o drivers/dma/libdma.o drivers/fpga/libfpga.o
drivers/gpio/libgpio.o drivers/hwmon/libhwmon.o drivers/i2c/libi2c.o
drivers/input/libinput.o drivers/misc/libmisc.o drivers/mmc/libmmc.o
drivers/mtd/libmtd.o drivers/mtd/nand/libnand.o
drivers/mtd/onenand/libonenand.o drivers/mtd/spi/libspi_flash.o
drivers/mtd/ubi/libubi.o drivers/net/libnet.o drivers/net/phy/libphy.o
drivers/pci/libpci.o drivers/pcmcia/libpcmcia.o drivers/power/libpower.o
drivers/rtc/librtc.o drivers/serial/libserial.o drivers/spi/libspi.o
drivers/twserial/libtws.o drivers/usb/eth/libusb_eth.o
drivers/usb/gadget/libusb_gadget.o drivers/usb/host/libusb_host.o
drivers/usb/musb/libusb_musb.o drivers/usb/phy/libusb_phy.o
drivers/video/libvideo.o drivers/watchdog/libwatchdog.o fs/cramfs/libcramfs.o
fs/ext2/libext2fs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o
fs/reiserfs/libreiserfs.o fs/ubifs/libubifs.o fs/yaffs2/libyaffs2.o
lib/libfdt/libfdt.o lib/libgeneric.o lib/lzma/liblzma.o lib/lzo/liblzo.o
lib/zlib/libz.o net/libnet.o post/libpost.o
board/armltd/versatile/libversatile.o -Wl,--end-group
/home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/eabi_compat.o -L
/usr/lib/gcc/arm-linux-gnueabi/4.6.1 -lgcc -Wl,-Map u-boot.map -o u-boot
But this command works and produces an u-boot ELF which has
Tag_CPU_name: "7-A".
How would I break the build when libgcc isn't ARMv5T?
Thanks,
--
Loïc Minier
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