tree 11556680589c1e0e6c9e95eb58cf0d1f71060426
parent 8de3b9e2db9bc6f84de309ab9226c3b843425752
author Fangrui Song <i@maskray.me> 1704759169 -0800
committer Copybara-Service <copybara-worker@google.com> 1704759274 -0800

[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

GitOrigin-RevId: 7c89b20e02ff079ec84fc54880dbc6c063d8c915