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Disable the Thumb no-return call optimization:

Browse Source 
mov lr, pc
b.w _foo

The "mov" instruction doesn't set bit zero to one, it's putting incorrect
value in lr. It messes up backtraces.

rdar://12663632


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167657 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2012-11-10 02:09:05 +00:00
parent 9c7ae01f39
commit b341fac05a
5 changed files with 2 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/ARM/ARMAsmPrinter.cpp
-25
View File
@@ -1413,31 +1413,6 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
}
return;
}
case ARM::t2BMOVPCB_CALL: {
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tMOVr);
TmpInst.addOperand(MCOperand::CreateReg(ARM::LR));
TmpInst.addOperand(MCOperand::CreateReg(ARM::PC));
// Add predicate operands.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::t2B);
const GlobalValue *GV = MI->getOperand(0).getGlobal();
MCSymbol *GVSym = Mang->getSymbol(GV);
const MCExpr *GVSymExpr = MCSymbolRefExpr::Create(GVSym, OutContext);
TmpInst.addOperand(MCOperand::CreateExpr(GVSymExpr));
// Add predicate operands.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
return;
}
case ARM::MOVi16_ga_pcrel:
case ARM::t2MOVi16_ga_pcrel: {
MCInst TmpInst;