mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-03 14:21:30 +00:00
6a222ec893
With this patch MCDisassembler::getInstruction takes an ArrayRef<uint8_t> instead of a MemoryObject. Even on X86 there is a maximum size an instruction can have. Given that, it seems way simpler and more efficient to just pass an ArrayRef to the disassembler instead of a MemoryObject and have it do a virtual call every time it wants some extra bytes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221751 91177308-0d34-0410-b5e6-96231b3b80d8
341 lines
12 KiB
C++
341 lines
12 KiB
C++
//===------ PPCDisassembler.cpp - Disassembler for PowerPC ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "PPC.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCFixedLenDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define DEBUG_TYPE "ppc-disassembler"
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typedef MCDisassembler::DecodeStatus DecodeStatus;
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namespace {
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class PPCDisassembler : public MCDisassembler {
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public:
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PPCDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx)
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: MCDisassembler(STI, Ctx) {}
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virtual ~PPCDisassembler() {}
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DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
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ArrayRef<uint8_t> Bytes, uint64_t Address,
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raw_ostream &VStream,
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raw_ostream &CStream) const override;
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};
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} // end anonymous namespace
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static MCDisassembler *createPPCDisassembler(const Target &T,
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const MCSubtargetInfo &STI,
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MCContext &Ctx) {
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return new PPCDisassembler(STI, Ctx);
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}
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extern "C" void LLVMInitializePowerPCDisassembler() {
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// Register the disassembler for each target.
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TargetRegistry::RegisterMCDisassembler(ThePPC32Target,
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createPPCDisassembler);
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TargetRegistry::RegisterMCDisassembler(ThePPC64Target,
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createPPCDisassembler);
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TargetRegistry::RegisterMCDisassembler(ThePPC64LETarget,
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createPPCDisassembler);
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}
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// FIXME: These can be generated by TableGen from the existing register
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// encoding values!
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static const unsigned CRRegs[] = {
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PPC::CR0, PPC::CR1, PPC::CR2, PPC::CR3,
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PPC::CR4, PPC::CR5, PPC::CR6, PPC::CR7
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};
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static const unsigned CRBITRegs[] = {
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PPC::CR0LT, PPC::CR0GT, PPC::CR0EQ, PPC::CR0UN,
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PPC::CR1LT, PPC::CR1GT, PPC::CR1EQ, PPC::CR1UN,
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PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
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PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
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PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
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PPC::CR5LT, PPC::CR5GT, PPC::CR5EQ, PPC::CR5UN,
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PPC::CR6LT, PPC::CR6GT, PPC::CR6EQ, PPC::CR6UN,
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PPC::CR7LT, PPC::CR7GT, PPC::CR7EQ, PPC::CR7UN
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};
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static const unsigned FRegs[] = {
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PPC::F0, PPC::F1, PPC::F2, PPC::F3,
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PPC::F4, PPC::F5, PPC::F6, PPC::F7,
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PPC::F8, PPC::F9, PPC::F10, PPC::F11,
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PPC::F12, PPC::F13, PPC::F14, PPC::F15,
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PPC::F16, PPC::F17, PPC::F18, PPC::F19,
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PPC::F20, PPC::F21, PPC::F22, PPC::F23,
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PPC::F24, PPC::F25, PPC::F26, PPC::F27,
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PPC::F28, PPC::F29, PPC::F30, PPC::F31
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};
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static const unsigned VRegs[] = {
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PPC::V0, PPC::V1, PPC::V2, PPC::V3,
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PPC::V4, PPC::V5, PPC::V6, PPC::V7,
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PPC::V8, PPC::V9, PPC::V10, PPC::V11,
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PPC::V12, PPC::V13, PPC::V14, PPC::V15,
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PPC::V16, PPC::V17, PPC::V18, PPC::V19,
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PPC::V20, PPC::V21, PPC::V22, PPC::V23,
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PPC::V24, PPC::V25, PPC::V26, PPC::V27,
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PPC::V28, PPC::V29, PPC::V30, PPC::V31
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};
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static const unsigned VSRegs[] = {
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PPC::VSL0, PPC::VSL1, PPC::VSL2, PPC::VSL3,
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PPC::VSL4, PPC::VSL5, PPC::VSL6, PPC::VSL7,
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PPC::VSL8, PPC::VSL9, PPC::VSL10, PPC::VSL11,
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PPC::VSL12, PPC::VSL13, PPC::VSL14, PPC::VSL15,
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PPC::VSL16, PPC::VSL17, PPC::VSL18, PPC::VSL19,
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PPC::VSL20, PPC::VSL21, PPC::VSL22, PPC::VSL23,
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PPC::VSL24, PPC::VSL25, PPC::VSL26, PPC::VSL27,
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PPC::VSL28, PPC::VSL29, PPC::VSL30, PPC::VSL31,
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PPC::VSH0, PPC::VSH1, PPC::VSH2, PPC::VSH3,
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PPC::VSH4, PPC::VSH5, PPC::VSH6, PPC::VSH7,
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PPC::VSH8, PPC::VSH9, PPC::VSH10, PPC::VSH11,
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PPC::VSH12, PPC::VSH13, PPC::VSH14, PPC::VSH15,
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PPC::VSH16, PPC::VSH17, PPC::VSH18, PPC::VSH19,
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PPC::VSH20, PPC::VSH21, PPC::VSH22, PPC::VSH23,
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PPC::VSH24, PPC::VSH25, PPC::VSH26, PPC::VSH27,
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PPC::VSH28, PPC::VSH29, PPC::VSH30, PPC::VSH31
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};
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static const unsigned VSFRegs[] = {
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PPC::F0, PPC::F1, PPC::F2, PPC::F3,
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PPC::F4, PPC::F5, PPC::F6, PPC::F7,
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PPC::F8, PPC::F9, PPC::F10, PPC::F11,
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PPC::F12, PPC::F13, PPC::F14, PPC::F15,
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PPC::F16, PPC::F17, PPC::F18, PPC::F19,
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PPC::F20, PPC::F21, PPC::F22, PPC::F23,
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PPC::F24, PPC::F25, PPC::F26, PPC::F27,
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PPC::F28, PPC::F29, PPC::F30, PPC::F31,
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PPC::VF0, PPC::VF1, PPC::VF2, PPC::VF3,
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PPC::VF4, PPC::VF5, PPC::VF6, PPC::VF7,
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PPC::VF8, PPC::VF9, PPC::VF10, PPC::VF11,
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PPC::VF12, PPC::VF13, PPC::VF14, PPC::VF15,
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PPC::VF16, PPC::VF17, PPC::VF18, PPC::VF19,
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PPC::VF20, PPC::VF21, PPC::VF22, PPC::VF23,
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PPC::VF24, PPC::VF25, PPC::VF26, PPC::VF27,
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PPC::VF28, PPC::VF29, PPC::VF30, PPC::VF31
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};
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static const unsigned GPRegs[] = {
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PPC::R0, PPC::R1, PPC::R2, PPC::R3,
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PPC::R4, PPC::R5, PPC::R6, PPC::R7,
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PPC::R8, PPC::R9, PPC::R10, PPC::R11,
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PPC::R12, PPC::R13, PPC::R14, PPC::R15,
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PPC::R16, PPC::R17, PPC::R18, PPC::R19,
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PPC::R20, PPC::R21, PPC::R22, PPC::R23,
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PPC::R24, PPC::R25, PPC::R26, PPC::R27,
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PPC::R28, PPC::R29, PPC::R30, PPC::R31
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};
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static const unsigned GP0Regs[] = {
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PPC::ZERO, PPC::R1, PPC::R2, PPC::R3,
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PPC::R4, PPC::R5, PPC::R6, PPC::R7,
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PPC::R8, PPC::R9, PPC::R10, PPC::R11,
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PPC::R12, PPC::R13, PPC::R14, PPC::R15,
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PPC::R16, PPC::R17, PPC::R18, PPC::R19,
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PPC::R20, PPC::R21, PPC::R22, PPC::R23,
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PPC::R24, PPC::R25, PPC::R26, PPC::R27,
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PPC::R28, PPC::R29, PPC::R30, PPC::R31
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};
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static const unsigned G8Regs[] = {
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PPC::X0, PPC::X1, PPC::X2, PPC::X3,
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PPC::X4, PPC::X5, PPC::X6, PPC::X7,
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PPC::X8, PPC::X9, PPC::X10, PPC::X11,
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PPC::X12, PPC::X13, PPC::X14, PPC::X15,
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PPC::X16, PPC::X17, PPC::X18, PPC::X19,
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PPC::X20, PPC::X21, PPC::X22, PPC::X23,
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PPC::X24, PPC::X25, PPC::X26, PPC::X27,
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PPC::X28, PPC::X29, PPC::X30, PPC::X31
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};
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template <std::size_t N>
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static DecodeStatus decodeRegisterClass(MCInst &Inst, uint64_t RegNo,
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const unsigned (&Regs)[N]) {
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assert(RegNo < N && "Invalid register number");
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Inst.addOperand(MCOperand::CreateReg(Regs[RegNo]));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeCRRCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, CRRegs);
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}
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static DecodeStatus DecodeCRBITRCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, CRBITRegs);
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}
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static DecodeStatus DecodeF4RCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, FRegs);
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}
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static DecodeStatus DecodeF8RCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, FRegs);
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}
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static DecodeStatus DecodeVRRCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, VRegs);
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}
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static DecodeStatus DecodeVSRCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, VSRegs);
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}
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static DecodeStatus DecodeVSFRCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, VSFRegs);
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}
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static DecodeStatus DecodeGPRCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, GPRegs);
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}
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static DecodeStatus DecodeGPRC_NOR0RegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, GP0Regs);
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}
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static DecodeStatus DecodeG8RCRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const void *Decoder) {
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return decodeRegisterClass(Inst, RegNo, G8Regs);
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}
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#define DecodePointerLikeRegClass0 DecodeGPRCRegisterClass
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#define DecodePointerLikeRegClass1 DecodeGPRC_NOR0RegisterClass
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template<unsigned N>
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static DecodeStatus decodeUImmOperand(MCInst &Inst, uint64_t Imm,
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int64_t Address, const void *Decoder) {
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assert(isUInt<N>(Imm) && "Invalid immediate");
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Inst.addOperand(MCOperand::CreateImm(Imm));
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return MCDisassembler::Success;
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}
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template<unsigned N>
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static DecodeStatus decodeSImmOperand(MCInst &Inst, uint64_t Imm,
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int64_t Address, const void *Decoder) {
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assert(isUInt<N>(Imm) && "Invalid immediate");
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Inst.addOperand(MCOperand::CreateImm(SignExtend64<N>(Imm)));
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return MCDisassembler::Success;
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}
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static DecodeStatus decodeMemRIOperands(MCInst &Inst, uint64_t Imm,
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int64_t Address, const void *Decoder) {
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// Decode the memri field (imm, reg), which has the low 16-bits as the
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// displacement and the next 5 bits as the register #.
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uint64_t Base = Imm >> 16;
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uint64_t Disp = Imm & 0xFFFF;
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assert(Base < 32 && "Invalid base register");
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switch (Inst.getOpcode()) {
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default: break;
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case PPC::LBZU:
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case PPC::LHAU:
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case PPC::LHZU:
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case PPC::LWZU:
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case PPC::LFSU:
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case PPC::LFDU:
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// Add the tied output operand.
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Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
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break;
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case PPC::STBU:
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case PPC::STHU:
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case PPC::STWU:
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case PPC::STFSU:
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case PPC::STFDU:
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Inst.insert(Inst.begin(), MCOperand::CreateReg(GP0Regs[Base]));
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break;
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}
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Inst.addOperand(MCOperand::CreateImm(SignExtend64<16>(Disp)));
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Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
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return MCDisassembler::Success;
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}
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static DecodeStatus decodeMemRIXOperands(MCInst &Inst, uint64_t Imm,
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int64_t Address, const void *Decoder) {
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// Decode the memrix field (imm, reg), which has the low 14-bits as the
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// displacement and the next 5 bits as the register #.
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uint64_t Base = Imm >> 14;
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uint64_t Disp = Imm & 0x3FFF;
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assert(Base < 32 && "Invalid base register");
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if (Inst.getOpcode() == PPC::LDU)
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// Add the tied output operand.
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Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
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else if (Inst.getOpcode() == PPC::STDU)
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Inst.insert(Inst.begin(), MCOperand::CreateReg(GP0Regs[Base]));
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Inst.addOperand(MCOperand::CreateImm(SignExtend64<16>(Disp << 2)));
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Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base]));
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return MCDisassembler::Success;
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}
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static DecodeStatus decodeCRBitMOperand(MCInst &Inst, uint64_t Imm,
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int64_t Address, const void *Decoder) {
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// The cr bit encoding is 0x80 >> cr_reg_num.
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unsigned Zeros = countTrailingZeros(Imm);
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assert(Zeros < 8 && "Invalid CR bit value");
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Inst.addOperand(MCOperand::CreateReg(CRRegs[7 - Zeros]));
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return MCDisassembler::Success;
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}
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#include "PPCGenDisassemblerTables.inc"
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DecodeStatus PPCDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
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ArrayRef<uint8_t> Bytes,
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uint64_t Address, raw_ostream &OS,
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raw_ostream &CS) const {
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// Get the four bytes of the instruction.
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Size = 4;
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if (Bytes.size() < 4) {
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Size = 0;
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return MCDisassembler::Fail;
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}
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// The instruction is big-endian encoded.
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uint32_t Inst =
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(Bytes[0] << 24) | (Bytes[1] << 16) | (Bytes[2] << 8) | (Bytes[3] << 0);
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return decodeInstruction(DecoderTable32, MI, Inst, Address, this, STI);
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}
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