[RISCV] Add CFI directives for RISCV prologue/epilog.
In order to generate correct debug frame information, it needs to
generate CFI information in prologue and epilog.
Differential Revision: https://reviews.llvm.org/D61773
llvm-svn: 363120
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
index d920fd2..bc45262 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
@@ -50,7 +50,13 @@
static MCAsmInfo *createRISCVMCAsmInfo(const MCRegisterInfo &MRI,
const Triple &TT) {
- return new RISCVMCAsmInfo(TT);
+ MCAsmInfo *MAI = new RISCVMCAsmInfo(TT);
+
+ unsigned SP = MRI.getDwarfRegNum(RISCV::X2, true);
+ MCCFIInstruction Inst = MCCFIInstruction::createDefCfa(nullptr, SP, 0);
+ MAI->addInitialFrameState(Inst);
+
+ return MAI;
}
static MCSubtargetInfo *createRISCVMCSubtargetInfo(const Triple &TT,