diff options
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp index adcf8ee8291..199a0debf88 100644 --- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp +++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp @@ -369,28 +369,70 @@ void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM, assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget && "High 16 bits of call target should be zero."); unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg(); - EncodedBytes = 6*4; + EncodedBytes = 0; // Materialize the jump address: EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8) .addReg(ScratchReg) .addImm((CallTarget >> 32) & 0xFFFF)); + ++EncodedBytes; EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC) .addReg(ScratchReg) .addReg(ScratchReg) .addImm(32).addImm(16)); + ++EncodedBytes; EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8) .addReg(ScratchReg) .addReg(ScratchReg) .addImm((CallTarget >> 16) & 0xFFFF)); + ++EncodedBytes; EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8) .addReg(ScratchReg) .addReg(ScratchReg) .addImm(CallTarget & 0xFFFF)); + // Save the current TOC pointer before the remote call. + int TOCSaveOffset = Subtarget->isELFv2ABI() ? 24 : 40; + EmitToStreamer(OutStreamer, MCInstBuilder(PPC::STD) + .addReg(PPC::X2) + .addImm(TOCSaveOffset) + .addReg(PPC::X1)); + ++EncodedBytes; + + + // If we're on ELFv1, then we need to load the actual function pointer from + // the function descriptor. + if (!Subtarget->isELFv2ABI()) { + // Load the new TOC pointer and the function address, but not r11 + // (needing this is rare, and loading it here would prevent passing it + // via a 'nest' parameter. + EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LD) + .addReg(PPC::X2) + .addImm(8) + .addReg(ScratchReg)); + ++EncodedBytes; + EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LD) + .addReg(ScratchReg) + .addImm(0) + .addReg(ScratchReg)); + ++EncodedBytes; + } + EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg)); + ++EncodedBytes; EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8)); + ++EncodedBytes; + + // Restore the TOC pointer after the call. + EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LD) + .addReg(PPC::X2) + .addImm(TOCSaveOffset) + .addReg(PPC::X1)); + ++EncodedBytes; } + // Each instruction is 4 bytes. + EncodedBytes *= 4; + // Emit padding. unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm(); assert(NumBytes >= EncodedBytes && |
