[all-commits] [llvm/llvm-project] bdcabc: [ELF] writeTrapInstr: Don't decrease p_memsz

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bdcabc486209298d1c8515423014e48595c1c96d
      https://github.com/llvm/llvm-project/commit/bdcabc486209298d1c8515423014e48595c1c96d
  Author: Fangrui Song <i at maskray.me>
  Date:   2025-05-10 (Sat, 10 May 2025)

  Changed paths:
    M lld/ELF/Writer.cpp
    M lld/test/ELF/fill-trap.s

  Log Message:
  -----------
  [ELF] writeTrapInstr: Don't decrease p_memsz

When the last PT_LOAD segment is executable and includes BSS sections,
its p_memsz may exceed the aligned p_filesz. This change ensures p_memsz
is not reduced in such cases (e.g. --omagic).

In addition, disable this behavior when a SECTIONS command is specified.

Refined behavior introduced in https://reviews.llvm.org/D37369 (2017).

The -z separate-loadable-segments --omagic test adds coverage for the
option combination, even if it might be practical.

Pull Request: https://github.com/llvm/llvm-project/pull/139207



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