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https://github.com/c64scene-ar/llvm-6502.git
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94be248dbb
the file now, however the relocated address is currently wrong. Fixing that will require some deep pondering. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30207 91177308-0d34-0410-b5e6-96231b3b80d8
126 lines
4.9 KiB
C++
126 lines
4.9 KiB
C++
//===-- PPCMachOWriter.cpp - Emit a Mach-O file for the PowerPC backend ---===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Nate Begeman and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a Mach-O writer for the PowerPC backend. The public
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// interface to this file is the createPPCMachOObjectWriterPass function.
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//
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//===----------------------------------------------------------------------===//
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#include "PPCRelocations.h"
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#include "PPCTargetMachine.h"
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#include "llvm/PassManager.h"
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#include "llvm/CodeGen/MachOWriter.h"
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#include "llvm/Support/Compiler.h"
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN PPCMachOWriter : public MachOWriter {
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public:
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PPCMachOWriter(std::ostream &O, PPCTargetMachine &TM) : MachOWriter(O, TM) {
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if (TM.getTargetData()->getPointerSizeInBits() == 64) {
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Header.cputype = MachOHeader::CPU_TYPE_POWERPC64;
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} else {
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Header.cputype = MachOHeader::CPU_TYPE_POWERPC;
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}
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Header.cpusubtype = MachOHeader::CPU_SUBTYPE_POWERPC_ALL;
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}
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virtual void GetTargetRelocation(MachOSection &MOS, MachineRelocation &MR,
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uint64_t Addr);
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// Constants for the relocation r_type field.
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// see <mach-o/ppc/reloc.h>
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enum { PPC_RELOC_VANILLA, // generic relocation
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PPC_RELOC_PAIR, // the second relocation entry of a pair
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PPC_RELOC_BR14, // 14 bit branch displacement to word address
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PPC_RELOC_BR24, // 24 bit branch displacement to word address
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PPC_RELOC_HI16, // a PAIR follows with the low 16 bits
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PPC_RELOC_LO16, // a PAIR follows with the high 16 bits
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PPC_RELOC_HA16, // a PAIR follows, which is sign extended to 32b
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PPC_RELOC_LO14 // LO16 with low 2 bits implicitly zero
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};
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};
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}
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/// addPPCMachOObjectWriterPass - Returns a pass that outputs the generated code
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/// as a Mach-O object file.
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///
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void llvm::addPPCMachOObjectWriterPass(FunctionPassManager &FPM,
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std::ostream &O, PPCTargetMachine &TM) {
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PPCMachOWriter *EW = new PPCMachOWriter(O, TM);
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FPM.add(EW);
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FPM.add(createPPCCodeEmitterPass(TM, EW->getMachineCodeEmitter()));
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}
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/// GetTargetRelocation - For the MachineRelocation MR, convert it to one or
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/// more PowerPC MachORelocation(s), add the new relocations to the
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/// MachOSection, and rewrite the instruction at the section offset if required
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/// by that relocation type.
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void PPCMachOWriter::GetTargetRelocation(MachOSection &MOS,
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MachineRelocation &MR,
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uint64_t Addr) {
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// Keep track of whether or not this is an externally defined relocation.
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uint32_t index = MOS.Index;
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bool isExtern = false;
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// Get the address of the instruction to rewrite
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unsigned char *RelocPos = &MOS.SectionData[0] + MR.getMachineCodeOffset();
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// Get the address of whatever it is we're relocating, if possible.
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if (MR.isGlobalValue()) {
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// determine whether or not its external and then figure out what section
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// we put it in if it's a locally defined symbol.
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} else if (MR.isString()) {
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// lookup in global values?
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} else {
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assert((MR.isConstantPoolIndex() || MR.isJumpTableIndex()) &&
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"Unhandled MachineRelocation type!");
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}
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switch ((PPC::RelocationType)MR.getRelocationType()) {
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default: assert(0 && "Unknown PPC relocation type!");
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case PPC::reloc_pcrel_bx:
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case PPC::reloc_pcrel_bcx:
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case PPC::reloc_absolute_low_ix:
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assert(0 && "Unhandled PPC relocation type!");
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break;
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case PPC::reloc_absolute_high:
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{
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MachORelocation HA16(MR.getMachineCodeOffset(), index, false, 2, isExtern,
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PPC_RELOC_HA16);
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MachORelocation PAIR(Addr & 0xFFFF, 0xFFFFFF, false, 2, isExtern,
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PPC_RELOC_PAIR);
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outword(RelocBuffer, HA16.r_address);
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outword(RelocBuffer, HA16.getPackedFields());
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outword(RelocBuffer, PAIR.r_address);
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outword(RelocBuffer, PAIR.getPackedFields());
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}
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MOS.nreloc += 2;
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Addr += 0x8000;
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*(unsigned *)RelocPos &= 0xFFFF0000;
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*(unsigned *)RelocPos |= ((Addr >> 16) & 0xFFFF);
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break;
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case PPC::reloc_absolute_low:
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{
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MachORelocation LO16(MR.getMachineCodeOffset(), index, false, 2, isExtern,
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PPC_RELOC_LO16);
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MachORelocation PAIR(Addr >> 16, 0xFFFFFF, false, 2, isExtern,
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PPC_RELOC_PAIR);
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outword(RelocBuffer, LO16.r_address);
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outword(RelocBuffer, LO16.getPackedFields());
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outword(RelocBuffer, PAIR.r_address);
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outword(RelocBuffer, PAIR.getPackedFields());
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}
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MOS.nreloc += 2;
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*(unsigned *)RelocPos &= 0xFFFF0000;
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*(unsigned *)RelocPos |= (Addr & 0xFFFF);
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break;
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}
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}
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