Fangrui Song
7c89b20e02
[ELF] OVERLAY: support optional start address and LMA ...
https://reviews.llvm.org/D44780 implemented rudimentary support for
OVERLAY. The start address and `AT(ldaddr)` in `OVERLAY [start] :
[NOCROSSREFS] [AT ( ldaddr )]` are not optional.
In addition, there are two issues:
* When the start address is `.`, subsequent sections don't share the
address of the first overlay section.
* When the first overlay section is empty and discardable, `p_paddr` is
incorrectly zero. This is because a discarded section has a zero
address, causing `prev->getLMA() + prev->size` where `prev` refers to
the first section to evaluate to zero.
This patch supports optional start address and LMA and fix the issues.
Close #77265
Pull Request: https://github.com/llvm/llvm-project/pull/77272
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7c89b20e02