ARM64: runtime-offset: make get_runtime_offset fully PIC

get_runtime_offset returns the offset that needs to be added onto
code addresses to arrive at the runtime address. This is 0 after code
relocation and the function calculates it by keeping a reference to _text
and substituting it from the actual _text address, which is found out in
a position-independent manner.

For enabling barebox PBL text section to be mappable W^X, we need to
avoid relocation entries within code, so let's move the runtime offset
into the data section, which is always mapped writable.

As ldr has only a 4K range for label references, we switch to ldr_l,
which has a 4G range.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20240304190038.3486881-58-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

0 files changed, 0 insertions, 0 deletions