Rustc/LLVM generates faulty code for aarch64 with opt-level=0

Question

I have two files which are assembled/compiled/linked into minimalistic kernel.

start.s:

    .set CPACR_EL1_FPEN, 0b11 << 20

    .set BOOT_STAC         


        

Answer 1

I've succeeded to run the non-optimised code without abnormalities. Thanks to Notlikethat for the idea. My stack was just mapped into readonly memory.

So I've just added the offset statement into my linker script (". = 1024M;") in order to make all the symbols to start from 1GiB (where RAM begins). After this modification the code started to work properly.