mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-04-10 19:50:45 +00:00
ae65e281f3
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
156 lines
4.7 KiB
C++
156 lines
4.7 KiB
C++
//===- AVRDisassembler.cpp - Disassembler for AVR ---------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is part of the AVR Disassembler.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AVR.h"
|
|
#include "AVRRegisterInfo.h"
|
|
#include "AVRSubtarget.h"
|
|
#include "MCTargetDesc/AVRMCTargetDesc.h"
|
|
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
|
|
#include "llvm/MC/MCFixedLenDisassembler.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "avr-disassembler"
|
|
|
|
typedef MCDisassembler::DecodeStatus DecodeStatus;
|
|
|
|
namespace {
|
|
|
|
/// A disassembler class for AVR.
|
|
class AVRDisassembler : public MCDisassembler {
|
|
public:
|
|
AVRDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx)
|
|
: MCDisassembler(STI, Ctx) {}
|
|
virtual ~AVRDisassembler() {}
|
|
|
|
DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
|
|
ArrayRef<uint8_t> Bytes, uint64_t Address,
|
|
raw_ostream &VStream,
|
|
raw_ostream &CStream) const override;
|
|
};
|
|
}
|
|
|
|
static MCDisassembler *createAVRDisassembler(const Target &T,
|
|
const MCSubtargetInfo &STI,
|
|
MCContext &Ctx) {
|
|
return new AVRDisassembler(STI, Ctx);
|
|
}
|
|
|
|
|
|
extern "C" void LLVMInitializeAVRDisassembler() {
|
|
// Register the disassembler.
|
|
TargetRegistry::RegisterMCDisassembler(getTheAVRTarget(),
|
|
createAVRDisassembler);
|
|
}
|
|
|
|
static DecodeStatus DecodeGPR8RegisterClass(MCInst &Inst, unsigned RegNo,
|
|
uint64_t Address, const void *Decoder) {
|
|
return MCDisassembler::Success;
|
|
}
|
|
|
|
static DecodeStatus DecodeLD8RegisterClass(MCInst &Inst, unsigned RegNo,
|
|
uint64_t Address, const void *Decoder) {
|
|
return MCDisassembler::Success;
|
|
}
|
|
|
|
static DecodeStatus DecodePTRREGSRegisterClass(MCInst &Inst, unsigned RegNo,
|
|
uint64_t Address, const void *Decoder) {
|
|
return MCDisassembler::Success;
|
|
}
|
|
|
|
#include "AVRGenDisassemblerTables.inc"
|
|
|
|
static DecodeStatus readInstruction16(ArrayRef<uint8_t> Bytes, uint64_t Address,
|
|
uint64_t &Size, uint32_t &Insn) {
|
|
if (Bytes.size() < 2) {
|
|
Size = 0;
|
|
return MCDisassembler::Fail;
|
|
}
|
|
|
|
Size = 2;
|
|
Insn = (Bytes[0] << 0) | (Bytes[1] << 8);
|
|
|
|
return MCDisassembler::Success;
|
|
}
|
|
|
|
static DecodeStatus readInstruction32(ArrayRef<uint8_t> Bytes, uint64_t Address,
|
|
uint64_t &Size, uint32_t &Insn) {
|
|
|
|
if (Bytes.size() < 4) {
|
|
Size = 0;
|
|
return MCDisassembler::Fail;
|
|
}
|
|
|
|
Size = 4;
|
|
Insn = (Bytes[0] << 0) | (Bytes[1] << 8) | (Bytes[2] << 16) | (Bytes[3] << 24);
|
|
|
|
return MCDisassembler::Success;
|
|
}
|
|
|
|
static const uint8_t *getDecoderTable(uint64_t Size) {
|
|
|
|
switch (Size) {
|
|
case 2: return DecoderTable16;
|
|
case 4: return DecoderTable32;
|
|
default: llvm_unreachable("instructions must be 16 or 32-bits");
|
|
}
|
|
}
|
|
|
|
DecodeStatus AVRDisassembler::getInstruction(MCInst &Instr, uint64_t &Size,
|
|
ArrayRef<uint8_t> Bytes,
|
|
uint64_t Address,
|
|
raw_ostream &VStream,
|
|
raw_ostream &CStream) const {
|
|
uint32_t Insn;
|
|
|
|
DecodeStatus Result;
|
|
|
|
// Try decode a 16-bit instruction.
|
|
{
|
|
Result = readInstruction16(Bytes, Address, Size, Insn);
|
|
|
|
if (Result == MCDisassembler::Fail) return MCDisassembler::Fail;
|
|
|
|
// Try to auto-decode a 16-bit instruction.
|
|
Result = decodeInstruction(getDecoderTable(Size), Instr,
|
|
Insn, Address, this, STI);
|
|
|
|
if (Result != MCDisassembler::Fail)
|
|
return Result;
|
|
}
|
|
|
|
// Try decode a 32-bit instruction.
|
|
{
|
|
Result = readInstruction32(Bytes, Address, Size, Insn);
|
|
|
|
if (Result == MCDisassembler::Fail) return MCDisassembler::Fail;
|
|
|
|
Result = decodeInstruction(getDecoderTable(Size), Instr, Insn,
|
|
Address, this, STI);
|
|
|
|
if (Result != MCDisassembler::Fail) {
|
|
return Result;
|
|
}
|
|
|
|
return MCDisassembler::Fail;
|
|
}
|
|
}
|
|
|
|
typedef DecodeStatus (*DecodeFunc)(MCInst &MI, unsigned insn, uint64_t Address,
|
|
const void *Decoder);
|
|
|