[PPC, SSP] Support PowerPC Linux stack protection.
llvm-svn: 266809
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
index b6dc00f..9b682dae 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -1857,3 +1857,19 @@
return makeArrayRef(TargetFlags);
}
+bool PPCInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
+ switch (MI->getOpcode()) {
+ case TargetOpcode::LOAD_STACK_GUARD: {
+ assert(Subtarget.isTargetLinux() &&
+ "Only Linux target is expected to contain LOAD_STACK_GUARD");
+ const int64_t Offset = Subtarget.isPPC64() ? -0x7010 : -0x7008;
+ const unsigned Reg = Subtarget.isPPC64() ? PPC::X13 : PPC::R2;
+ MI->setDesc(get(PPC::LD));
+ MachineInstrBuilder(*MI->getParent()->getParent(), MI)
+ .addImm(Offset)
+ .addReg(Reg);
+ return true;
+ }
+ }
+ return false;
+}