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56f8caa1fa
The current header implementation is incomplete: the text_offset and image_size slots are overlaid with internal relocation metadata (_rel_stack_base / _rel_stack_size), and the flags field is zero, which makes some bootloaders unhappy. Fill up the the missing props and while at it, stub out the image header into a header file to avoid duplicating. image_size is computed in the linker script as _stack_end - _start so the early stack page is included in the runtime memory footprint advertised to the previous-stage bootloader. Patch inspired by work from @Trijal08 and cleaned up to not account for ELF PiE.