From 09fecf9a4796bc9d0abaeea1a200037a6ed80c22 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Fri, 8 Dec 2006 04:54:03 +0000 Subject: [PATCH] this is an initial patch to switch the ppc64 jit over to working in PIC mode, which allows the code to be above the 2G marker. We still need to JIT emit dyld stubs to support external, weak, common, etc globals, but that will happen tomorrow. llvm-svn: 32348 --- llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp | 25 +++++++++++++++++--- llvm/lib/Target/PowerPC/PPCJITInfo.cpp | 2 ++ llvm/lib/Target/PowerPC/PPCTargetMachine.cpp | 12 ++++++++-- 3 files changed, 34 insertions(+), 5 deletions(-) diff --git a/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp b/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp index 7f5e86fb93f0..3857c6a3edbb 100644 --- a/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp +++ b/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp @@ -31,6 +31,10 @@ namespace { TargetMachine &TM; MachineCodeEmitter &MCE; + /// MovePCtoLROffset - When/if we see a MovePCtoLR instruction, we record + /// its address in the function into this pointer. + void *MovePCtoLROffset; + /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr /// int getMachineOpValue(MachineInstr &MI, MachineOperand &MO); @@ -77,6 +81,7 @@ bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) { MF.getTarget().getRelocationModel() != Reloc::Static) && "JIT relocation model must be set to static or default!"); do { + MovePCtoLROffset = 0; MCE.startFunction(MF); for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB) emitBasicBlock(*BB); @@ -102,7 +107,9 @@ void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) { break; // pseudo opcode, no side effects case PPC::MovePCtoLR: case PPC::MovePCtoLR8: - assert(0 && "CodeEmitter does not support MovePCtoLR instruction"); + assert(TM.getRelocationModel() == Reloc::PIC_); + MovePCtoLROffset = (void*)MCE.getCurrentPCValue(); + MCE.emitWordBE(0x48000005); // bl 1 break; } } @@ -129,6 +136,15 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) { if (MI.getOpcode() == PPC::BL || MI.getOpcode() == PPC::BL8) Reloc = PPC::reloc_pcrel_bx; else { + // If in PIC mode, we need to encode the negated address of the + // 'movepctolr' into the unrelocated field. After relocation, we'll have + // &gv-&movepctolr in the imm field. Once &movepctolr is added to the imm + // field, we get &gv. + if (TM.getRelocationModel() == Reloc::PIC_) { + assert(MovePCtoLROffset && "MovePCtoLR not seen yet?"); + rv = -(intptr_t)MovePCtoLROffset - 4; + } + switch (MI.getOpcode()) { default: MI.dump(); assert(0 && "Unknown instruction for relocation!"); case PPC::LIS: @@ -136,6 +152,7 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) { case PPC::ADDIS: case PPC::ADDIS8: Reloc = PPC::reloc_absolute_high; // Pointer to symbol + rv >>= 16; break; case PPC::LI: case PPC::LI8: @@ -156,6 +173,7 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) { case PPC::STFS: case PPC::STFD: Reloc = PPC::reloc_absolute_low; + rv &= 0xFFFF; break; case PPC::LWA: @@ -163,6 +181,8 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) { case PPC::STD: case PPC::STD_32: Reloc = PPC::reloc_absolute_low_ix; + rv &= 0xFFFF; + rv >>= 2; break; } } @@ -185,8 +205,7 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) { unsigned Opcode = MI.getOpcode(); if (Opcode == PPC::B || Opcode == PPC::BL || Opcode == PPC::BLA) Reloc = PPC::reloc_pcrel_bx; - else - // BLT,BLE,BEQ,BGE,BGT,BNE, or other bcx instruction + else // BCC instruction Reloc = PPC::reloc_pcrel_bcx; MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(), Reloc, diff --git a/llvm/lib/Target/PowerPC/PPCJITInfo.cpp b/llvm/lib/Target/PowerPC/PPCJITInfo.cpp index 24a62fe23042..e3858f4c8946 100644 --- a/llvm/lib/Target/PowerPC/PPCJITInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCJITInfo.cpp @@ -103,6 +103,7 @@ asm( // Arguments to Compilation Callback: // r3 - our lr (address of the call instruction in stub plus 4) // r4 - stub's lr (address of instruction that called the stub plus 4) + // r5 - is64Bit - always 0. "mr r3, r0\n" "lwz r2, 208(r1)\n" // stub's frame "lwz r4, 8(r2)\n" // stub's lr @@ -164,6 +165,7 @@ asm( // Arguments to Compilation Callback: // r3 - our lr (address of the call instruction in stub plus 4) // r4 - stub's lr (address of instruction that called the stub plus 4) + // r5 - is64Bit - always 1. "mr r3, r0\n" "ld r2, 208(r1)\n" // stub's frame "ld r4, 16(r2)\n" // stub's lr diff --git a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp index dde998f5a7f1..9dcbc0487008 100644 --- a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp +++ b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp @@ -135,9 +135,17 @@ bool PPCTargetMachine::addObjectWriter(FunctionPassManager &PM, bool Fast, bool PPCTargetMachine::addCodeEmitter(FunctionPassManager &PM, bool Fast, MachineCodeEmitter &MCE) { - // The JIT should use the static relocation model. + // The JIT should use the static relocation model in ppc32 mode, PIC in ppc64. // FIXME: This should be moved to TargetJITInfo!! - setRelocationModel(Reloc::Static); + if (Subtarget.isPPC64()) { + // We use PIC codegen in ppc64 mode, because otherwise we'd have to use many + // instructions to materialize arbitrary global variable + function + + // constant pool addresses. + setRelocationModel(Reloc::PIC_); + } else { + setRelocationModel(Reloc::Static); + } + // Machine code emitter pass for PowerPC. PM.add(createPPCCodeEmitterPass(*this, MCE));