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//===-- PPCMachOWriterInfo.cpp - Mach-O Writer Info for the PowerPC -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements Mach-O writer information for the PowerPC backend.
//
//===----------------------------------------------------------------------===//
#include "PPCMachOWriterInfo.h"
#include "PPCRelocations.h"
#include "PPCTargetMachine.h"
#include "llvm/CodeGen/MachORelocation.h"
#include "llvm/Support/OutputBuffer.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstdio>
using namespace llvm;
PPCMachOWriterInfo::PPCMachOWriterInfo(const PPCTargetMachine &TM)
: TargetMachOWriterInfo(TM.getTargetData()->getPointerSizeInBits() == 64 ?
HDR_CPU_TYPE_POWERPC64 :
HDR_CPU_TYPE_POWERPC,
HDR_CPU_SUBTYPE_POWERPC_ALL) {}
PPCMachOWriterInfo::~PPCMachOWriterInfo() {}
/// 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.
unsigned PPCMachOWriterInfo::GetTargetRelocation(MachineRelocation &MR,
unsigned FromIdx,
unsigned ToAddr,
unsigned ToIdx,
OutputBuffer &RelocOut,
OutputBuffer &SecOut,
bool Scattered,
bool isExtern) const {
unsigned NumRelocs = 0;
uint64_t Addr = 0;
// Get the address of whatever it is we're relocating, if possible.
if (!isExtern)
Addr = (uintptr_t)MR.getResultPointer() + ToAddr;
switch ((PPC::RelocationType)MR.getRelocationType()) {
default: llvm_unreachable("Unknown PPC relocation type!");
case PPC::reloc_absolute_low_ix:
llvm_unreachable("Unhandled PPC relocation type!");
break;
case PPC::reloc_vanilla:
{
// FIXME: need to handle 64 bit vanilla relocs
MachORelocation VANILLA(MR.getMachineCodeOffset(), ToIdx,
false, 2, isExtern,
PPC_RELOC_VANILLA,
Scattered, (intptr_t)MR.getResultPointer());
++NumRelocs;
if (Scattered) {
RelocOut.outword(VANILLA.getPackedFields());
RelocOut.outword(VANILLA.getAddress());
} else {
RelocOut.outword(VANILLA.getAddress());
RelocOut.outword(VANILLA.getPackedFields());
}
intptr_t SymbolOffset;
if (Scattered)
SymbolOffset = Addr + MR.getConstantVal();
else
SymbolOffset = Addr;
printf("vanilla fixup: sec_%x[%x] = %x\n", FromIdx,
unsigned(MR.getMachineCodeOffset()),
unsigned(SymbolOffset));
SecOut.fixword(SymbolOffset, MR.getMachineCodeOffset());
}
break;
case PPC::reloc_pcrel_bx:
{
// FIXME: Presumably someday we will need to branch to other, non-extern
// functions too. Need to figure out some way to distinguish between
// target is BB and target is function.
if (isExtern) {
MachORelocation BR24(MR.getMachineCodeOffset(), ToIdx, true, 2,
isExtern, PPC_RELOC_BR24, Scattered,
(intptr_t)MR.getMachineCodeOffset());
RelocOut.outword(BR24.getAddress());
RelocOut.outword(BR24.getPackedFields());
++NumRelocs;
}
Addr -= MR.getMachineCodeOffset();
Addr >>= 2;
Addr &= 0xFFFFFF;
Addr <<= 2;
Addr |= (SecOut[MR.getMachineCodeOffset()] << 24);
Addr |= (SecOut[MR.getMachineCodeOffset()+3] & 0x3);
SecOut.fixword(Addr, MR.getMachineCodeOffset());
break;
}
case PPC::reloc_pcrel_bcx:
{
Addr -= MR.getMachineCodeOffset();
Addr &= 0xFFFC;
SecOut.fixhalf(Addr, MR.getMachineCodeOffset() + 2);
break;
}
case PPC::reloc_absolute_high:
{
MachORelocation HA16(MR.getMachineCodeOffset(), ToIdx, false, 2,
isExtern, PPC_RELOC_HA16);
MachORelocation PAIR(Addr & 0xFFFF, 0xFFFFFF, false, 2, isExtern,
PPC_RELOC_PAIR);
NumRelocs = 2;
RelocOut.outword(HA16.getRawAddress());
RelocOut.outword(HA16.getPackedFields());
RelocOut.outword(PAIR.getRawAddress());
RelocOut.outword(PAIR.getPackedFields());
Addr += 0x8000;
SecOut.fixhalf(Addr >> 16, MR.getMachineCodeOffset() + 2);
break;
}
case PPC::reloc_absolute_low:
{
MachORelocation LO16(MR.getMachineCodeOffset(), ToIdx, false, 2,
isExtern, PPC_RELOC_LO16);
MachORelocation PAIR(Addr >> 16, 0xFFFFFF, false, 2, isExtern,
PPC_RELOC_PAIR);
NumRelocs = 2;
RelocOut.outword(LO16.getRawAddress());
RelocOut.outword(LO16.getPackedFields());
RelocOut.outword(PAIR.getRawAddress());
RelocOut.outword(PAIR.getPackedFields());
SecOut.fixhalf(Addr, MR.getMachineCodeOffset() + 2);
break;
}
}
return NumRelocs;
}
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