2012-12-16 17:29:14 +00:00
|
|
|
//===- XCoreDisassembler.cpp - Disassembler for XCore -----------*- C++ -*-===//
|
|
|
|
//
|
|
|
|
// The LLVM Compiler Infrastructure
|
|
|
|
//
|
|
|
|
// This file is distributed under the University of Illinois Open Source
|
|
|
|
// License. See LICENSE.TXT for details.
|
|
|
|
//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//
|
|
|
|
// This file is part of the XCore Disassembler.
|
|
|
|
//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
2012-12-16 17:37:34 +00:00
|
|
|
#include "XCore.h"
|
|
|
|
#include "XCoreRegisterInfo.h"
|
2012-12-16 17:29:14 +00:00
|
|
|
#include "llvm/MC/MCDisassembler.h"
|
|
|
|
#include "llvm/MC/MCFixedLenDisassembler.h"
|
2012-12-16 17:37:34 +00:00
|
|
|
#include "llvm/MC/MCInst.h"
|
2012-12-16 17:29:14 +00:00
|
|
|
#include "llvm/MC/MCSubtargetInfo.h"
|
|
|
|
#include "llvm/Support/MemoryObject.h"
|
|
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
|
|
|
|
|
|
using namespace llvm;
|
|
|
|
|
|
|
|
typedef MCDisassembler::DecodeStatus DecodeStatus;
|
|
|
|
|
|
|
|
namespace {
|
|
|
|
|
|
|
|
/// XCoreDisassembler - a disasembler class for XCore.
|
|
|
|
class XCoreDisassembler : public MCDisassembler {
|
2012-12-16 17:37:34 +00:00
|
|
|
const MCRegisterInfo *RegInfo;
|
2012-12-16 17:29:14 +00:00
|
|
|
public:
|
|
|
|
/// Constructor - Initializes the disassembler.
|
|
|
|
///
|
2012-12-16 17:37:34 +00:00
|
|
|
XCoreDisassembler(const MCSubtargetInfo &STI, const MCRegisterInfo *Info) :
|
|
|
|
MCDisassembler(STI), RegInfo(Info) {}
|
2012-12-16 17:29:14 +00:00
|
|
|
|
|
|
|
/// getInstruction - See MCDisassembler.
|
|
|
|
virtual DecodeStatus getInstruction(MCInst &instr,
|
|
|
|
uint64_t &size,
|
|
|
|
const MemoryObject ®ion,
|
|
|
|
uint64_t address,
|
|
|
|
raw_ostream &vStream,
|
|
|
|
raw_ostream &cStream) const;
|
2012-12-16 17:37:34 +00:00
|
|
|
|
|
|
|
const MCRegisterInfo *getRegInfo() const { return RegInfo; }
|
2012-12-16 17:29:14 +00:00
|
|
|
};
|
2012-12-16 17:37:34 +00:00
|
|
|
}
|
2012-12-16 17:29:14 +00:00
|
|
|
|
2012-12-16 17:37:34 +00:00
|
|
|
static bool readInstruction16(const MemoryObject ®ion,
|
|
|
|
uint64_t address,
|
|
|
|
uint64_t &size,
|
|
|
|
uint16_t &insn) {
|
|
|
|
uint8_t Bytes[4];
|
|
|
|
|
|
|
|
// We want to read exactly 2 Bytes of data.
|
|
|
|
if (region.readBytes(address, 2, Bytes, NULL) == -1) {
|
|
|
|
size = 0;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
// Encoded as a little-endian 16-bit word in the stream.
|
|
|
|
insn = (Bytes[0] << 0) | (Bytes[1] << 8);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned getReg(const void *D, unsigned RC, unsigned RegNo) {
|
|
|
|
const XCoreDisassembler *Dis = static_cast<const XCoreDisassembler*>(D);
|
|
|
|
return *(Dis->getRegInfo()->getRegClass(RC).begin() + RegNo);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst,
|
|
|
|
unsigned RegNo,
|
|
|
|
uint64_t Address,
|
|
|
|
const void *Decoder);
|
|
|
|
|
|
|
|
#include "XCoreGenDisassemblerTables.inc"
|
|
|
|
|
|
|
|
static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst,
|
|
|
|
unsigned RegNo,
|
|
|
|
uint64_t Address,
|
|
|
|
const void *Decoder)
|
|
|
|
{
|
|
|
|
if (RegNo > 11)
|
|
|
|
return MCDisassembler::Fail;
|
|
|
|
unsigned Reg = getReg(Decoder, XCore::GRRegsRegClassID, RegNo);
|
|
|
|
Inst.addOperand(MCOperand::CreateReg(Reg));
|
|
|
|
return MCDisassembler::Success;
|
2012-12-16 17:29:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
MCDisassembler::DecodeStatus
|
|
|
|
XCoreDisassembler::getInstruction(MCInst &instr,
|
|
|
|
uint64_t &Size,
|
|
|
|
const MemoryObject &Region,
|
|
|
|
uint64_t Address,
|
|
|
|
raw_ostream &vStream,
|
|
|
|
raw_ostream &cStream) const {
|
2012-12-16 17:37:34 +00:00
|
|
|
uint16_t low;
|
|
|
|
|
|
|
|
if (!readInstruction16(Region, Address, Size, low)) {
|
|
|
|
return Fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Calling the auto-generated decoder function.
|
|
|
|
DecodeStatus Result = decodeInstruction(DecoderTable16, instr, low, Address,
|
|
|
|
this, STI);
|
|
|
|
if (Result != Fail) {
|
|
|
|
Size = 2;
|
|
|
|
return Result;
|
|
|
|
}
|
|
|
|
|
2012-12-16 17:29:14 +00:00
|
|
|
return Fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
namespace llvm {
|
|
|
|
extern Target TheXCoreTarget;
|
|
|
|
}
|
|
|
|
|
|
|
|
static MCDisassembler *createXCoreDisassembler(const Target &T,
|
|
|
|
const MCSubtargetInfo &STI) {
|
2012-12-16 17:37:34 +00:00
|
|
|
return new XCoreDisassembler(STI, T.createMCRegInfo(""));
|
2012-12-16 17:29:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
extern "C" void LLVMInitializeXCoreDisassembler() {
|
|
|
|
// Register the disassembler.
|
|
|
|
TargetRegistry::RegisterMCDisassembler(TheXCoreTarget,
|
|
|
|
createXCoreDisassembler);
|
|
|
|
}
|