https://bugs.llvm.org/show_bug.cgi?id=39922
Bug ID: 39922
Summary: LLD is missing support for ARMv6M thunks
Product: lld
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: eblot...@gmail.com
CC: llvm-bugs@lists.llvm.org, peter.sm...@linaro.org
ARMv6M does not support movw/movt Thumb2 instructions.
Current LLD version v7.0 emits such instructions to generate long jump in
thunks. For example, this code generation occurs when code is relocated from
flash to RAM on embedded Cortex-M0/M0+ cores.
This prevents using LLD with Cortex-M0/M0+ cores when such a feature is used.
I've written a small patch to support this feature, but I'm not a LLD developer
and I do not know how to write valid tests for the LLVM infrastructure, so I
guess this would require more work effort to propose a valid patch:
https://gist.github.com/eblot/43552f8c01cc7d2ee4faef42454c2c83
It only support absolute addressing, not position-independent code - I'm not
sure this is a useful feature on M0+ core anyway and I would not have any real
world examples to test it.
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