On 11/05/21 19:03, Alexandru Elisei wrote:
I think it's because I'm using the*arm-none-eabi* toolchain for compilation instead of arm-linux-gnu, that's the toolchain for cross compiling arm code that is present in the official Arch Linux repositories. Is that unsupported? I don't remember any mention of it not being supported, but it's entirely possible that I just forgot.
No, it's just that there was no difference until now. If you can add it to CI we can make sure it doesn't break.
With rem initialized to 0 I get this: rm-none-eabi-ld -nostdlib -Ttext=40010000 -o arm/selftest.elf -T /home/alex/data/repos/kvm-unit-tests/arm/flat.lds \ arm/selftest.o arm/cstart.o lib/libcflat.a lib/libfdt/libfdt.a lib/arm/libeabi.a arm/selftest.aux.o arm-none-eabi-ld: lib/libcflat.a(printf.o): in function `print_int': /home/alex/data/repos/kvm-unit-tests/lib/printf.c:72: undefined reference to `__aeabi_ldivmod' arm-none-eabi-ld: /home/alex/data/repos/kvm-unit-tests/lib/printf.c:73: undefined reference to `__aeabi_ldivmod' arm-none-eabi-ld: lib/libcflat.a(printf.o): in function `print_unsigned': /home/alex/data/repos/kvm-unit-tests/lib/printf.c:102: undefined reference to `__aeabi_uldivmod' arm-none-eabi-ld: lib/libcflat.a(alloc_page.o): in function `_page_alloc_init_area': /home/alex/data/repos/kvm-unit-tests/lib/alloc_page.c:482: undefined reference to `__aeabi_uldivmod' make: *** [/home/alex/data/repos/kvm-unit-tests/arm/Makefile.common:65: arm/selftest.elf] Error 1
So for this we need to include the uldivmod and ldivmod functions similar to those in https://android.googlesource.com/toolchain/compiler-rt/+/release_32/lib/arm.
The uninitialized warning is because of the division by zero case. I've sent a couple patches to fix everything, please review!
Paolo
