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Fix the FDE encoding to be relative on ELF.

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This is a very late complement to r130637 which fixed this on x86_64. Fixes
pr15448.

Since it looks like that every elf architecture uses this encoding when using
cfi, make it the default for elf. Just exclude mips64el. It has a lovely
.ll -> .o test (ef_frame.ll) that tests that nothing changes in the binary
content of the .eh_frame produced by llc. Oblige it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177141 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-03-15 05:51:57 +00:00
parent 0cfb42adb5
commit 7a86ffb19f
2 changed files with 17 additions and 6 deletions
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12
lib/MC/MCObjectFileInfo.cpp
View File

@ -223,6 +223,11 @@ void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
}
void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
// FIXME: Check this. Mips64el is using the base values, which is most likely
// incorrect.
if (T.getArch() != Triple::mips64el)
FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
if (T.getArch() == Triple::x86) {
PersonalityEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
@ -230,15 +235,13 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
LSDAEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_absptr;
FDEEncoding = FDECFIEncoding = (RelocM == Reloc::PIC_)
FDEEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_absptr;
TTypeEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_absptr;
} else if (T.getArch() == Triple::x86_64) {
FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
if (RelocM == Reloc::PIC_) {
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
@ -261,8 +264,6 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
}
} else if (T.getArch() == Triple::aarch64) {
FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
// The small model guarantees static code/data size < 4GB, but not where it
// will be in memory. Most of these could end up >2GB away so even a signed
// pc-relative 32-bit address is insufficient, theoretically.
@ -282,7 +283,6 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
} else if (T.getArch() == Triple::ppc64) {
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_udata8;
FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |

11
test/MC/ELF/fde-reloc.s Normal file
View File

@ -0,0 +1,11 @@
// RUN: llvm-mc -filetype=obj %s -o - -triple x86_64-pc-linux | llvm-objdump -r - | FileCheck --check-prefix=X86-64 %s
// RUN: llvm-mc -filetype=obj %s -o - -triple i686-pc-linux | llvm-objdump -r - | FileCheck --check-prefix=I686 %s
// PR15448
func:
.cfi_startproc
.cfi_endproc
// X86-64: R_X86_64_PC32
// I686: R_386_PC32