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Fix MIPS exception personality encoding.

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For MIPS, we have to encode the personality routine with
an indirect pointer to absptr; otherwise, some link warning
warning will be raised, and the program might crash in some
early MIPS Android device.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209907 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Logan Chien 2014-05-30 16:48:56 +00:00
parent ba735134d7
commit 731d23ed42
4 changed files with 46 additions and 9 deletions
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2
lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
View File

@ -59,7 +59,7 @@ void DwarfCFIException::endModule() {
unsigned PerEncoding = TLOF.getPersonalityEncoding();
if ((PerEncoding & 0x70) != dwarf::DW_EH_PE_pcrel)
if ((PerEncoding & 0x80) != dwarf::DW_EH_PE_indirect)
return;
// Emit references to all used personality functions

12
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -48,16 +48,12 @@ MCSymbol *TargetLoweringObjectFileELF::getCFIPersonalitySymbol(
const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
MachineModuleInfo *MMI) const {
unsigned Encoding = getPersonalityEncoding();
switch (Encoding & 0x70) {
default:
report_fatal_error("We do not support this DWARF encoding yet!");
case dwarf::DW_EH_PE_absptr:
return TM.getSymbol(GV, Mang);
case dwarf::DW_EH_PE_pcrel: {
if ((Encoding & 0x80) == dwarf::DW_EH_PE_indirect)
return getContext().GetOrCreateSymbol(StringRef("DW.ref.") +
TM.getSymbol(GV, Mang)->getName());
}
}
if ((Encoding & 0x70) == dwarf::DW_EH_PE_absptr)
return TM.getSymbol(GV, Mang);
report_fatal_error("We do not support this DWARF encoding yet!");
}
void TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer,

7
lib/MC/MCObjectFileInfo.cpp
View File

@ -321,6 +321,13 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
TTypeEncoding = dwarf::DW_EH_PE_absptr;
}
break;
case Triple::mips:
case Triple::mipsel:
// MIPS uses indirect pointer to refer personality functions, so that the
// eh_frame section can be read-only. DW.ref.personality will be generated
// for relocation.
PersonalityEncoding = dwarf::DW_EH_PE_indirect;
break;
case Triple::ppc64:
case Triple::ppc64le:
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |

34
test/CodeGen/Mips/ehframe-indirect.ll Normal file
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@ -0,0 +1,34 @@
; RUN: llc -mtriple=mipsel-linux-gnu < %s | FileCheck %s
; RUN: llc -mtriple=mipsel-linux-android < %s | FileCheck %s
define i32 @main() {
; CHECK: .cfi_startproc
; CHECK: .cfi_personality 128, DW.ref.__gxx_personality_v0
entry:
invoke void @foo() to label %cont unwind label %lpad
; CHECK: foo
; CHECK: jalr
lpad:
%0 = landingpad { i8*, i32 } personality i8*
bitcast (i32 (...)* @__gxx_personality_v0 to i8*) catch i8* null
ret i32 0
cont:
ret i32 0
}
; CHECK: .cfi_endproc
declare i32 @__gxx_personality_v0(...)
declare void @foo()
; CHECK: .hidden DW.ref.__gxx_personality_v0
; CHECK: .weak DW.ref.__gxx_personality_v0
; CHECK: .section .data.DW.ref.__gxx_personality_v0,"aGw",@progbits,DW.ref.__gxx_personality_v0,comdat
; CHECK: .align 2
; CHECK: .type DW.ref.__gxx_personality_v0,@object
; CHECK: .size DW.ref.__gxx_personality_v0, 4
; CHECK: DW.ref.__gxx_personality_v0:
; CHECK: .4byte __gxx_personality_v0