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Fix unwind info relocation with large code model on AArch64 

Makes sure that the unwind info uses 64bits pcrel relocation if a large code model is specified and handle the corresponding relocation in the ExecutionEngine. This can happen with certain kernel configuration (the same as the one in https://reviews.llvm.org/D27609, found at least on the ArchLinux stock kernel and the one used on https://www.packet.net/) using the builtin JIT memory manager.

Co-authored-by: Yichao Yu <yyc1992@gmail.com>

Differential Revision: https://reviews.llvm.org/D27629
This commit is contained in:
Valentin Churavy 2020-11-06 14:26:04 -05:00 committed by Jameson Nash
parent 573ade4bef
commit 18805ea951
2 changed files with 22 additions and 0 deletions
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2
llvm/lib/MC/MCObjectFileInfo.cpp
View File

@ -317,6 +317,8 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) {
break;
case Triple::ppc64:
case Triple::ppc64le:
case Triple::aarch64:
case Triple::aarch64_be:
case Triple::x86_64:
FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
(Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);

20
llvm/test/MC/AArch64/ELF_ARM64_large-relocations.s Normal file
View File

@ -0,0 +1,20 @@
# RUN: llvm-mc -triple=arm64-none-linux-gnu -large-code-model -filetype=obj -o %T/large-reloc.o %s
# RUN: llvm-rtdyld -triple=arm64-none-linux-gnu -verify -map-section large-reloc.o,.eh_frame=0x10000 -map-section large-reloc.o,.text=0xffff000000000000 -check=%s %T/large-reloc.o
# RUN-BE: llvm-mc -triple=aarch64_be-none-linux-gnu -large-code-model -filetype=obj -o %T/be-large-reloc.o %s
# RUN-BE: llvm-rtdyld -triple=aarch64_be-none-linux-gnu -verify -map-section be-large-reloc.o,.eh_frame=0x10000 -map-section be-large-reloc.o,.text=0xffff000000000000 -check=%s %T/be-large-reloc.o
.text
.globl g
.p2align 2
.type g,@function
g:
.cfi_startproc
mov x0, xzr
ret
.Lfunc_end0:
.size g, .Lfunc_end0-g
.cfi_endproc
# Skip the CIE and load the 8 bytes PC begin pointer.
# Assuming the CIE and the FDE length are both 4 bytes.
# rtdyld-check: *{8}(section_addr(large-reloc.o, .eh_frame) + (*{4}(section_addr(large-reloc.o, .eh_frame))) + 0xc) = g - (section_addr(large-reloc.o, .eh_frame) + (*{4}(section_addr(large-reloc.o, .eh_frame))) + 0xc)