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248c2d045e
Arm Trusted Firmware (TF-A) v2.11 fails to build in some situations
with the error message:
ld: build/qemu/release/bl1/bl1.elf: error: PHDR segment not covered by LOAD segment
This error can be reproduced with the commands:
make qemu_aarch64_ebbr_defconfig
utils/config --set-str BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION_VALUE v2.11
make olddefconfig
make
This issue was reported in [1].
This error is coming from a check that was made more strict since
binutils ld 2.34. This error message is normally related to dynamic
linker, so it should normally not apply to a package like TF-A.
When BR2_SHARED_LIBS=y (shared libraries only) and BR2_PIC_PIE=y
(Build code with PIC/PIE), the Buildroot toolchain-wrapper will try
to enable position-independent code/executables. See [2]. This
configuration is a common default.
Arm Trusted Firmware (TF-A) build system, on its side, tries to detect
if the toolchain enables PIE automatically. It does so by checking if
--enable-default-pie is in the output of "$(CC) -v". If found, the TF-A
build system tries to disable PIE globally (it can be explicitly
enabled again with the ENABLE_PIE=1 build variable, in some specific
configurations). This detection mechanism is not working with the
Buildroot toolchain wrapper which is enabling PIE silently. See [3].
Commit 1061ed6c "boot/arm-trusted-firmware: add -fno-PIE to CFLAGS"
added the option -fno-PIE in CFLAGS for that reason. See [4].
TF-A >= v2.11 now needs the same treatment for LDFLAGS. This is
because TF-A switched the default linker from "ld" to "gcc", in
upstream commit [5]. This change makes the Buildroot toolchain wrapper
to enable PIE at link, without passing the "--no-dynamic-linker" option
that would normally avoids this ld error.
Also, even if there is no defconfigs using the
BR2_TARGET_ARM_TRUSTED_FIRMWARE_LATEST_VERSION config directive, it is
worth mentioning that the Buildroot TF-A "latest version" was updated
to v2.11 in commit 9c50759cd "boot/arm-trusted-firmware: bump to
v2.11". See [6]. This latest version is the default choice. So
Buildroot is subject to generate this build failure. This can be
reproduced with the commands:
cat <<EOF >.config
BR2_aarch64=y
BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="qemu"
BR2_TOOLCHAIN_EXTERNAL=y
EOF
make olddefconfig
make arm-trusted-firmware
This commit fixes the issue by adding the option "-no-pie" in LDFLAGS.
This will prevent the Buildroot toolchain wrapper to enable PIE, for
versions using "gcc" as a linker. This change should also remain
compatible with older TF-A < 2.11 using "ld" as a linker, since
"-no-pie" is also a valid ld option.
Fixes:
ld: build/qemu/release/bl1/bl1.elf: error: PHDR segment not covered by LOAD segment
[1] https://github.com/TrustedFirmware-A/trusted-firmware-a/issues/26
[2] https://gitlab.com/buildroot.org/buildroot/-/blob/2024.08-rc3/toolchain/toolchain-wrapper.c?ref_type=tags#L403
[3] https://git.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a.git/+/refs/tags/v2.11.0/Makefile#711
[4] 1061ed6c62
[5] 2f1c5e7eb1%5E%21/
[6] 9c50759cd1
Reported-by: Vincent Stehlé <vincent.stehle@arm.com>
Tested-by: Vincent Stehlé <vincent.stehle@arm.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches