diff options
Diffstat (limited to 'contrib/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp | 100 |
1 files changed, 76 insertions, 24 deletions
diff --git a/contrib/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/contrib/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp index 9a63c14..ec354c2 100644 --- a/contrib/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp +++ b/contrib/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp @@ -1092,8 +1092,28 @@ void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() { } // ELFv2 ABI - Normal entry label. - if (Subtarget->isELFv2ABI()) + if (Subtarget->isELFv2ABI()) { + // In the Large code model, we allow arbitrary displacements between + // the text section and its associated TOC section. We place the + // full 8-byte offset to the TOC in memory immediatedly preceding + // the function global entry point. + if (TM.getCodeModel() == CodeModel::Large + && !MF->getRegInfo().use_empty(PPC::X2)) { + const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>(); + + MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC.")); + MCSymbol *GlobalEPSymbol = PPCFI->getGlobalEPSymbol(); + const MCExpr *TOCDeltaExpr = + MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext), + MCSymbolRefExpr::create(GlobalEPSymbol, + OutContext), + OutContext); + + OutStreamer->EmitLabel(PPCFI->getTOCOffsetSymbol()); + OutStreamer->EmitValue(TOCDeltaExpr, 8); + } return AsmPrinter::EmitFunctionEntryLabel(); + } // Emit an official procedure descriptor. MCSectionSubPair Current = OutStreamer->getCurrentSection(); @@ -1160,10 +1180,25 @@ void PPCLinuxAsmPrinter::EmitFunctionBodyStart() { // thus emit a prefix sequence along the following lines: // // func: + // .Lfunc_gepNN: + // # global entry point + // addis r2,r12,(.TOC.-.Lfunc_gepNN)@ha + // addi r2,r2,(.TOC.-.Lfunc_gepNN)@l + // .Lfunc_lepNN: + // .localentry func, .Lfunc_lepNN-.Lfunc_gepNN + // # local entry point, followed by function body + // + // For the Large code model, we create + // + // .Lfunc_tocNN: + // .quad .TOC.-.Lfunc_gepNN # done by EmitFunctionEntryLabel + // func: + // .Lfunc_gepNN: // # global entry point - // addis r2,r12,(.TOC.-func)@ha - // addi r2,r2,(.TOC.-func)@l - // .localentry func, .-func + // ld r2,.Lfunc_tocNN-.Lfunc_gepNN(r12) + // add r2,r2,r12 + // .Lfunc_lepNN: + // .localentry func, .Lfunc_lepNN-.Lfunc_gepNN // # local entry point, followed by function body // // This ensures we have r2 set up correctly while executing the function @@ -1171,32 +1206,49 @@ void PPCLinuxAsmPrinter::EmitFunctionBodyStart() { if (Subtarget->isELFv2ABI() // Only do all that if the function uses r2 in the first place. && !MF->getRegInfo().use_empty(PPC::X2)) { + const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>(); - MCSymbol *GlobalEntryLabel = OutContext.createTempSymbol(); + MCSymbol *GlobalEntryLabel = PPCFI->getGlobalEPSymbol(); OutStreamer->EmitLabel(GlobalEntryLabel); const MCSymbolRefExpr *GlobalEntryLabelExp = MCSymbolRefExpr::create(GlobalEntryLabel, OutContext); - MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC.")); - const MCExpr *TOCDeltaExpr = - MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext), - GlobalEntryLabelExp, OutContext); + if (TM.getCodeModel() != CodeModel::Large) { + MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC.")); + const MCExpr *TOCDeltaExpr = + MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext), + GlobalEntryLabelExp, OutContext); - const MCExpr *TOCDeltaHi = - PPCMCExpr::createHa(TOCDeltaExpr, false, OutContext); - EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS) - .addReg(PPC::X2) - .addReg(PPC::X12) - .addExpr(TOCDeltaHi)); - - const MCExpr *TOCDeltaLo = - PPCMCExpr::createLo(TOCDeltaExpr, false, OutContext); - EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDI) - .addReg(PPC::X2) - .addReg(PPC::X2) - .addExpr(TOCDeltaLo)); - - MCSymbol *LocalEntryLabel = OutContext.createTempSymbol(); + const MCExpr *TOCDeltaHi = + PPCMCExpr::createHa(TOCDeltaExpr, false, OutContext); + EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS) + .addReg(PPC::X2) + .addReg(PPC::X12) + .addExpr(TOCDeltaHi)); + + const MCExpr *TOCDeltaLo = + PPCMCExpr::createLo(TOCDeltaExpr, false, OutContext); + EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDI) + .addReg(PPC::X2) + .addReg(PPC::X2) + .addExpr(TOCDeltaLo)); + } else { + MCSymbol *TOCOffset = PPCFI->getTOCOffsetSymbol(); + const MCExpr *TOCOffsetDeltaExpr = + MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCOffset, OutContext), + GlobalEntryLabelExp, OutContext); + + EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD) + .addReg(PPC::X2) + .addExpr(TOCOffsetDeltaExpr) + .addReg(PPC::X12)); + EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD8) + .addReg(PPC::X2) + .addReg(PPC::X2) + .addReg(PPC::X12)); + } + + MCSymbol *LocalEntryLabel = PPCFI->getLocalEPSymbol(); OutStreamer->EmitLabel(LocalEntryLabel); const MCSymbolRefExpr *LocalEntryLabelExp = MCSymbolRefExpr::create(LocalEntryLabel, OutContext); |
