mirror of
https://git.proxmox.com/git/llvm-toolchain
synced 2025-06-15 16:07:01 +00:00
49 lines
2.4 KiB
Diff
49 lines
2.4 KiB
Diff
From ab40c027f0ce9492919a72ad339de40bdb84b354 Mon Sep 17 00:00:00 2001
|
|
From: Dimitry Andric <dimitry@andric.com>
|
|
Date: Mon, 3 May 2021 20:08:49 +0200
|
|
Subject: [PATCH] [MC][ELF] Work around R_MIPS_LO16 relocation handling problem
|
|
|
|
This fixes PR49821, and avoids "ld.lld: error: test.o:(.rodata.str1.1):
|
|
offset is outside the section" errors when linking MIPS objects with
|
|
negative R_MIPS_LO16 implicit addends.
|
|
|
|
ld.lld handles R_MIPS_HI16/R_MIPS_LO16 separately, not as a whole, so it
|
|
doesn't know that an R_MIPS_HI16 with implicit addend 1 and an
|
|
R_MIPS_LO16 with implicit addend -32768 represents 32768, which is in
|
|
range of a MergeInputSection. We could introduce a new RelExpr member
|
|
(like R_RISCV_PC_INDIRECT for R_RISCV_PCREL_HI20 / R_RISCV_PCREL_LO12)
|
|
but the complexity is unnecessary given that GNU as keeps the original
|
|
symbol for this case as well.
|
|
|
|
Reviewed By: atanasyan, MaskRay
|
|
|
|
Differential Revision: https://reviews.llvm.org/D101773
|
|
---
|
|
llvm/lib/MC/ELFObjectWriter.cpp | 11 +++++++++++
|
|
llvm/test/MC/Mips/mips_lo16.s | 22 ++++++++++++++++++++++
|
|
2 files changed, 33 insertions(+)
|
|
create mode 100644 llvm/test/MC/Mips/mips_lo16.s
|
|
|
|
Index: llvm-toolchain-snapshot_16~++20220920091612+a7d2409bac7f/llvm/lib/MC/ELFObjectWriter.cpp
|
|
===================================================================
|
|
--- llvm-toolchain-snapshot_16~++20220920091612+a7d2409bac7f.orig/llvm/lib/MC/ELFObjectWriter.cpp
|
|
+++ llvm-toolchain-snapshot_16~++20220920091612+a7d2409bac7f/llvm/lib/MC/ELFObjectWriter.cpp
|
|
@@ -1369,6 +1369,17 @@ bool ELFObjectWriter::shouldRelocateWith
|
|
if (TargetObjectWriter->getEMachine() == ELF::EM_MIPS &&
|
|
!hasRelocationAddend())
|
|
return true;
|
|
+
|
|
+ // ld.lld handles R_MIPS_HI16/R_MIPS_LO16 separately, not as a whole, so
|
|
+ // it doesn't know that an R_MIPS_HI16 with implicit addend 1 and an
|
|
+ // R_MIPS_LO16 with implicit addend -32768 represents 32768, which is in
|
|
+ // range of a MergeInputSection. We could introduce a new RelExpr member
|
|
+ // (like R_RISCV_PC_INDIRECT for R_RISCV_PCREL_HI20 / R_RISCV_PCREL_LO12)
|
|
+ // but the complexity is unnecessary given that GNU as keeps the original
|
|
+ // symbol for this case as well.
|
|
+ if (TargetObjectWriter->getEMachine() == ELF::EM_MIPS &&
|
|
+ !hasRelocationAddend())
|
|
+ return true;
|
|
}
|
|
|
|
// Most TLS relocations use a got, so they need the symbol. Even those that
|