mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33479 91177308-0d34-0410-b5e6-96231b3b80d8
156 lines
5.7 KiB
C++
156 lines
5.7 KiB
C++
//===-- PPCMachOWriter.cpp - Emit a Mach-O file for the PowerPC backend ---===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by Nate Begeman and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements a Mach-O writer for the PowerPC backend. The public
|
|
// interface to this file is the createPPCMachOObjectWriterPass function.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "PPCRelocations.h"
|
|
#include "PPCTargetMachine.h"
|
|
#include "llvm/PassManager.h"
|
|
#include "llvm/CodeGen/MachOWriter.h"
|
|
#include "llvm/Support/Compiler.h"
|
|
#include "llvm/Support/OutputBuffer.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
class VISIBILITY_HIDDEN PPCMachOWriter : public MachOWriter {
|
|
public:
|
|
PPCMachOWriter(std::ostream &O, PPCTargetMachine &TM)
|
|
: MachOWriter(O, TM) {}
|
|
|
|
virtual void GetTargetRelocation(MachineRelocation &MR, MachOSection &From,
|
|
MachOSection &To);
|
|
|
|
// Constants for the relocation r_type field.
|
|
// see <mach-o/ppc/reloc.h>
|
|
enum { PPC_RELOC_VANILLA, // generic relocation
|
|
PPC_RELOC_PAIR, // the second relocation entry of a pair
|
|
PPC_RELOC_BR14, // 14 bit branch displacement to word address
|
|
PPC_RELOC_BR24, // 24 bit branch displacement to word address
|
|
PPC_RELOC_HI16, // a PAIR follows with the low 16 bits
|
|
PPC_RELOC_LO16, // a PAIR follows with the high 16 bits
|
|
PPC_RELOC_HA16, // a PAIR follows, which is sign extended to 32b
|
|
PPC_RELOC_LO14 // LO16 with low 2 bits implicitly zero
|
|
};
|
|
};
|
|
}
|
|
|
|
/// addPPCMachOObjectWriterPass - Returns a pass that outputs the generated code
|
|
/// as a Mach-O object file.
|
|
///
|
|
void llvm::addPPCMachOObjectWriterPass(FunctionPassManager &FPM,
|
|
std::ostream &O, PPCTargetMachine &TM) {
|
|
PPCMachOWriter *MOW = new PPCMachOWriter(O, TM);
|
|
FPM.add(MOW);
|
|
FPM.add(createPPCCodeEmitterPass(TM, MOW->getMachineCodeEmitter()));
|
|
}
|
|
|
|
/// GetTargetRelocation - For the MachineRelocation MR, convert it to one or
|
|
/// more PowerPC MachORelocation(s), add the new relocations to the
|
|
/// MachOSection, and rewrite the instruction at the section offset if required
|
|
/// by that relocation type.
|
|
void PPCMachOWriter::GetTargetRelocation(MachineRelocation &MR,
|
|
MachOSection &From,
|
|
MachOSection &To) {
|
|
uint64_t Addr = 0;
|
|
|
|
// Keep track of whether or not this is an externally defined relocation.
|
|
bool isExtern = false;
|
|
|
|
// Get the address of whatever it is we're relocating, if possible.
|
|
if (!isExtern)
|
|
Addr = (uintptr_t)MR.getResultPointer() + To.addr;
|
|
|
|
switch ((PPC::RelocationType)MR.getRelocationType()) {
|
|
default: assert(0 && "Unknown PPC relocation type!");
|
|
case PPC::reloc_absolute_low_ix:
|
|
assert(0 && "Unhandled PPC relocation type!");
|
|
break;
|
|
case PPC::reloc_vanilla:
|
|
{
|
|
// FIXME: need to handle 64 bit vanilla relocs
|
|
MachORelocation VANILLA(MR.getMachineCodeOffset(), To.Index, false, 2,
|
|
isExtern, PPC_RELOC_VANILLA);
|
|
++From.nreloc;
|
|
|
|
OutputBuffer RelocOut(From.RelocBuffer, is64Bit, isLittleEndian);
|
|
RelocOut.outword(VANILLA.r_address);
|
|
RelocOut.outword(VANILLA.getPackedFields());
|
|
|
|
OutputBuffer SecOut(From.SectionData, is64Bit, isLittleEndian);
|
|
SecOut.fixword(Addr, MR.getMachineCodeOffset());
|
|
break;
|
|
}
|
|
case PPC::reloc_pcrel_bx:
|
|
{
|
|
Addr -= MR.getMachineCodeOffset();
|
|
Addr >>= 2;
|
|
Addr &= 0xFFFFFF;
|
|
Addr <<= 2;
|
|
Addr |= (From.SectionData[MR.getMachineCodeOffset()] << 24);
|
|
|
|
OutputBuffer SecOut(From.SectionData, is64Bit, isLittleEndian);
|
|
SecOut.fixword(Addr, MR.getMachineCodeOffset());
|
|
break;
|
|
}
|
|
case PPC::reloc_pcrel_bcx:
|
|
{
|
|
Addr -= MR.getMachineCodeOffset();
|
|
Addr &= 0xFFFC;
|
|
|
|
OutputBuffer SecOut(From.SectionData, is64Bit, isLittleEndian);
|
|
SecOut.fixhalf(Addr, MR.getMachineCodeOffset() + 2);
|
|
break;
|
|
}
|
|
case PPC::reloc_absolute_high:
|
|
{
|
|
MachORelocation HA16(MR.getMachineCodeOffset(), To.Index, false, 2,
|
|
isExtern, PPC_RELOC_HA16);
|
|
MachORelocation PAIR(Addr & 0xFFFF, 0xFFFFFF, false, 2, isExtern,
|
|
PPC_RELOC_PAIR);
|
|
++From.nreloc;
|
|
++From.nreloc;
|
|
|
|
OutputBuffer RelocOut(From.RelocBuffer, is64Bit, isLittleEndian);
|
|
RelocOut.outword(HA16.r_address);
|
|
RelocOut.outword(HA16.getPackedFields());
|
|
RelocOut.outword(PAIR.r_address);
|
|
RelocOut.outword(PAIR.getPackedFields());
|
|
printf("ha16: %x\n", (unsigned)Addr);
|
|
Addr += 0x8000;
|
|
|
|
OutputBuffer SecOut(From.SectionData, is64Bit, isLittleEndian);
|
|
SecOut.fixhalf(Addr >> 16, MR.getMachineCodeOffset() + 2);
|
|
break;
|
|
}
|
|
case PPC::reloc_absolute_low:
|
|
{
|
|
MachORelocation LO16(MR.getMachineCodeOffset(), To.Index, false, 2,
|
|
isExtern, PPC_RELOC_LO16);
|
|
MachORelocation PAIR(Addr >> 16, 0xFFFFFF, false, 2, isExtern,
|
|
PPC_RELOC_PAIR);
|
|
++From.nreloc;
|
|
++From.nreloc;
|
|
|
|
OutputBuffer RelocOut(From.RelocBuffer, is64Bit, isLittleEndian);
|
|
RelocOut.outword(LO16.r_address);
|
|
RelocOut.outword(LO16.getPackedFields());
|
|
RelocOut.outword(PAIR.r_address);
|
|
RelocOut.outword(PAIR.getPackedFields());
|
|
printf("lo16: %x\n", (unsigned)Addr);
|
|
|
|
OutputBuffer SecOut(From.SectionData, is64Bit, isLittleEndian);
|
|
SecOut.fixhalf(Addr, MR.getMachineCodeOffset() + 2);
|
|
break;
|
|
}
|
|
}
|
|
}
|