_xeroxz
3 years ago
parent
29804c5015
commit
1c6fd327b1
@ -0,0 +1,41 @@
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#pragma once
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#include <vmprofiler.hpp>
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/IRPrintingPasses.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/IR/Verifier.h"
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namespace vm
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{
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class vmp_rtn_t
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{
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llvm::Function *llvm_fptr;
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llvm::AllocaInst *flags, *stack;
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llvm::Module *llvm_module;
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std::uintptr_t rtn_begin;
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std::shared_ptr< llvm::IRBuilder<> > ir_builder;
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std::vector< llvm::AllocaInst * > virtual_registers;
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std::vector< std::pair< std::uintptr_t, llvm::BasicBlock * > > llvm_code_blocks;
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std::vector< vm::instrs::code_block_t > vmp2_code_blocks;
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void create_virtual_registers( void );
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void create_routine( void );
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friend class devirt_t;
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friend class lifters_t;
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public:
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explicit vmp_rtn_t( std::uintptr_t rtn_begin, std::vector< vm::instrs::code_block_t > vmp2_code_blocks,
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std::shared_ptr< llvm::IRBuilder<> > &ir_builder, llvm::Module *llvm_module );
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};
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} // namespace vm
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#include <devirt_t.hpp>
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#include <vm_lifters.hpp>
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namespace vm
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{
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devirt_t::devirt_t( llvm::LLVMContext *llvm_ctx, llvm::Module *llvm_module )
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: llvm_ctx( llvm_ctx ), llvm_module( llvm_module )
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{
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ir_builder = std::make_shared< llvm::IRBuilder<> >( *llvm_ctx );
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}
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void devirt_t::push( std::uint8_t num_bytes, llvm::Value *val )
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{
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// sub rsp, num_bytes
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auto current_rtn = vmp_rtns.back();
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auto rsp_addr = ir_builder->CreateLoad( current_rtn->stack );
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auto sub_rsp_val =
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ir_builder->CreateGEP( ir_builder->getInt8Ty(), rsp_addr, ir_builder->getInt8( 0 - num_bytes ) );
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ir_builder->CreateStore( sub_rsp_val, current_rtn->stack );
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// mov [rsp], val
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auto resized_new_rsp_addr = ir_builder->CreateBitCast(
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sub_rsp_val, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, num_bytes * 8 ), 0ull ) );
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ir_builder->CreateStore( val, resized_new_rsp_addr );
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}
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llvm::Value *devirt_t::pop( std::uint8_t num_bytes )
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{
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// mov rax, [rsp]
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auto current_rtn = vmp_rtns.back();
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auto rsp_addr = ir_builder->CreateLoad( current_rtn->stack );
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auto new_rsp_addr =
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ir_builder->CreateGEP( ir_builder->getInt8Ty(), rsp_addr, ir_builder->getInt8( num_bytes ) );
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auto resized_new_rsp_addr = ir_builder->CreateBitCast(
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rsp_addr, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, num_bytes * 8 ), 0ull ) );
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auto pop_val = ir_builder->CreateLoad( resized_new_rsp_addr );
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ir_builder->CreateStore( new_rsp_addr, current_rtn->stack );
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ir_builder->CreateStore( llvm::UndefValue::get( ir_builder->getInt8Ty() ), rsp_addr );
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return pop_val;
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}
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llvm::Value *devirt_t::load_value( std::uint8_t byte_size, llvm::GlobalValue *var )
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{
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if ( byte_size * 8 != var->getType()->getPrimitiveSizeInBits() )
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{
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auto cast_ptr = ir_builder->CreatePointerCast(
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var, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), 0 ) );
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), cast_ptr );
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}
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), var );
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}
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llvm::Value *devirt_t::load_value( std::uint8_t byte_size, llvm::AllocaInst *var )
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{
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if ( byte_size * 8 != var->getType()->getPrimitiveSizeInBits() )
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{
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auto cast_ptr = ir_builder->CreatePointerCast(
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var, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), 0 ) );
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), cast_ptr );
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}
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), var );
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}
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bool devirt_t::compile( std::vector< std::uint8_t > &obj )
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{
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return true;
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}
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llvm::Function *devirt_t::lift( std::uintptr_t rtn_begin, std::vector< vm::instrs::code_block_t > code_blocks )
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{
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vmp_rtns.push_back( std::make_shared< vm::vmp_rtn_t >( rtn_begin, code_blocks, ir_builder, llvm_module ) );
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auto &vmp_rtn = vmp_rtns.back();
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auto lifters = vm::lifters_t::get_instance();
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for ( auto idx = 0u; idx < vmp_rtn->vmp2_code_blocks.size(); ++idx )
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{
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ir_builder->SetInsertPoint( vmp_rtn->llvm_code_blocks[ idx ].second );
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for ( auto &vinstr : vmp_rtn->vmp2_code_blocks[ idx ].vinstrs )
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{
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if ( !lifters->lift( this, vmp_rtn->vmp2_code_blocks[ idx ], vinstr, ir_builder.get() ) )
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{
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std::printf(
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"> failed to devirtualize virtual instruction with opcode = %d, handler table rva = 0x%x\n",
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vinstr.opcode, vinstr.trace_data.regs.r12 - vinstr.trace_data.regs.r13 );
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return nullptr;
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}
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}
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}
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return vmp_rtn->llvm_fptr;
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}
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llvm::Value *devirt_t::compute_sf( std::uint8_t byte_size, llvm::Value *val )
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{
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auto op_size = llvm::IntegerType::get( *llvm_ctx, byte_size * 8 );
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auto msb = ir_builder->CreateLShr( val, ( byte_size * 8 ) - 1 );
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return ir_builder->CreateZExt( msb, llvm::IntegerType::get( *llvm_ctx, 64 ) );
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}
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llvm::Value *devirt_t::compute_zf( std::uint8_t byte_size, llvm::Value *val )
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{
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auto op_size = llvm::IntegerType::get( *llvm_ctx, byte_size * 8 );
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auto is_zero = ir_builder->CreateICmpEQ( val, llvm::ConstantInt::get( op_size, 0 ) );
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return ir_builder->CreateZExt( is_zero, llvm::IntegerType::get( *llvm_ctx, 64 ) );
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}
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llvm::Value *devirt_t::compute_pf( std::uint8_t byte_size, llvm::Value *val )
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{
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auto operand_size = llvm::IntegerType::get( *llvm_ctx, byte_size * 8 );
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auto popcount_intrinsic = llvm::Intrinsic::getDeclaration( llvm_module, llvm::Intrinsic::ctpop,
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{ llvm::IntegerType::get( *llvm_ctx, 64 ) } );
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auto lower_bits = ir_builder->CreateIntCast( val, llvm::IntegerType::get( *llvm_ctx, 8 ), false );
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auto extended_bits = ir_builder->CreateZExt( lower_bits, llvm::IntegerType::get( *llvm_ctx, 64 ) );
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return ir_builder->CreateCall( popcount_intrinsic, { extended_bits } );
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}
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llvm::Value *devirt_t::combine_flags( llvm::Value *cf, llvm::Value *pf, llvm::Value *af, llvm::Value *zf,
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llvm::Value *sf, llvm::Value *of )
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{
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auto shifted_pf = ir_builder->CreateShl( pf, 2, "shifted_pf", true, true );
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auto shifted_af = ir_builder->CreateShl( llvm::ConstantInt::get( llvm::IntegerType::get( *llvm_ctx, 64 ), 0 ),
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4, "shifted_af", true, true ); // treat af as zero
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auto shifted_zf = ir_builder->CreateShl( zf, 6, "shifted_zf", true, true );
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auto shifted_sf = ir_builder->CreateShl( sf, 7, "shifted_sf", true, true );
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auto shifted_of = ir_builder->CreateShl( of, 11, "shifted_of", true, true );
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auto or1 = ir_builder->CreateOr( cf, shifted_of );
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auto or2 = ir_builder->CreateOr( or1, shifted_zf );
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auto or3 = ir_builder->CreateOr( or2, shifted_sf );
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auto or4 = ir_builder->CreateOr( or3, shifted_af );
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auto or5 = ir_builder->CreateOr( or4, shifted_pf );
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return ir_builder->CreateXor( or5, llvm::ConstantInt::get( llvm::IntegerType::get( *llvm_ctx, 64 ), 514 ) );
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}
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} // namespace vm
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@ -1,182 +0,0 @@
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#include <vm_lifters.hpp>
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#include <vmp_rtn.hpp>
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namespace vm
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{
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vmp_rtn_t::vmp_rtn_t( llvm::LLVMContext *llvm_ctx, llvm::Module *llvm_module, vm::ctx_t *vm_ctx,
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std::uintptr_t rtn_begin, std::vector< vm::instrs::code_block_t > vmp2_code_blocks )
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: llvm_ctx( llvm_ctx ), llvm_module( llvm_module ), vm_ctx( vm_ctx ), rtn_begin( rtn_begin ),
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vmp2_code_blocks( vmp2_code_blocks )
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{
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// do not change the ordering of these function calls...
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create_routine();
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ir_builder = std::make_shared< llvm::IRBuilder<> >( *llvm_ctx );
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ir_builder->SetInsertPoint( llvm_code_blocks[ 0 ].second );
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flags = ir_builder->CreateAlloca( ir_builder->getInt64Ty(), nullptr, "flags" );
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stack = ir_builder->CreateAlloca( llvm::PointerType::get( ir_builder->getInt8Ty(), 0ull ), nullptr, "sp" );
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ir_builder->CreateStore( llvm_fptr->getArg( 0 ), stack );
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create_virtual_registers();
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}
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void vmp_rtn_t::create_virtual_registers( void )
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{
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for ( auto idx = 0u; idx < 24; ++idx )
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// allocate virtual register space...
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virtual_registers.push_back(
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ir_builder->CreateAlloca( llvm::IntegerType::get( *llvm_ctx, 64 ), nullptr,
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( std::string( "vreg" ) + std::to_string( idx ) ).c_str() ) );
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}
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void vmp_rtn_t::create_routine( void )
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{
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// function has no arguments and returns void... maybe change this in the future as i learn
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// more and more LLVM...
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auto func_ty = llvm::FunctionType::get( llvm::PointerType::getInt8PtrTy( *llvm_ctx ),
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{ llvm::PointerType::getInt8PtrTy( *llvm_ctx ) }, false );
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// convert the rtn_begin address to a hex string and prepend "rtn_" to it...
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std::stringstream rtn_name;
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rtn_name << "rtn_" << std::hex << rtn_begin;
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llvm_fptr = llvm::Function::Create( func_ty, llvm::GlobalValue::LinkageTypes::ExternalLinkage,
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rtn_name.str().c_str(), *llvm_module );
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for ( const auto &vmp2_code_block : vmp2_code_blocks )
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{
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// create basic block name... block_xxxxxxxx format...
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std::stringstream blk_name;
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blk_name << "blk_" << std::hex << vmp2_code_block.vip_begin;
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llvm_code_blocks.push_back( { vmp2_code_block.vip_begin,
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llvm::BasicBlock::Create( *llvm_ctx, blk_name.str().c_str(), llvm_fptr ) } );
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}
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}
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void vmp_rtn_t::push( std::uint8_t num_bytes, llvm::Value *val )
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{
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// sub rsp, num_bytes
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auto rsp_addr = ir_builder->CreateLoad( stack, "rsp_addr" );
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auto sub_rsp_val = ir_builder->CreateGEP( ir_builder->getInt8Ty(), rsp_addr,
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ir_builder->getInt8( 0 - num_bytes ), "sub_rsp_val" );
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ir_builder->CreateStore( sub_rsp_val, stack );
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// mov [rsp], val
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auto resized_new_rsp_addr = ir_builder->CreateBitCast(
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sub_rsp_val, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, num_bytes * 8 ), 0ull ) );
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ir_builder->CreateStore( val, resized_new_rsp_addr );
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}
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llvm::Value *vmp_rtn_t::pop( std::uint8_t num_bytes )
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{
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// mov rax, [rsp]
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auto rsp_addr = ir_builder->CreateLoad( stack, "rsp_addr" );
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auto new_rsp_addr = ir_builder->CreateGEP( ir_builder->getInt8Ty(), rsp_addr, ir_builder->getInt8( num_bytes ),
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"new_rsp_addr" );
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auto resized_new_rsp_addr = ir_builder->CreateBitCast(
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rsp_addr, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, num_bytes * 8 ), 0ull ) );
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auto pop_val = ir_builder->CreateLoad( resized_new_rsp_addr );
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ir_builder->CreateStore( new_rsp_addr, stack );
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ir_builder->CreateStore( llvm::UndefValue::get( ir_builder->getInt8Ty() ), rsp_addr );
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return pop_val;
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}
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llvm::Value *vmp_rtn_t::load_value( std::uint8_t byte_size, llvm::GlobalValue *var )
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{
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if ( byte_size * 8 != var->getType()->getPrimitiveSizeInBits() )
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{
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auto cast_ptr = ir_builder->CreatePointerCast(
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var, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), 0 ) );
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), cast_ptr );
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}
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), var );
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}
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llvm::Value *vmp_rtn_t::load_value( std::uint8_t byte_size, llvm::AllocaInst *var )
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{
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if ( byte_size * 8 != var->getType()->getPrimitiveSizeInBits() )
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{
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auto cast_ptr = ir_builder->CreatePointerCast(
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var, llvm::PointerType::get( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), 0 ) );
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), cast_ptr );
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}
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return ir_builder->CreateLoad( llvm::IntegerType::get( *llvm_ctx, byte_size * 8 ), var );
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}
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llvm::Function *vmp_rtn_t::lift( void )
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{
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auto &code_blocks = llvm_fptr->getBasicBlockList();
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auto lifters = vm::lifters_t::get_instance();
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for ( auto idx = 0u; idx < code_blocks.size(); ++idx )
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{
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ir_builder->SetInsertPoint( llvm_code_blocks[ idx ].second );
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for ( auto &vinstr : vmp2_code_blocks[ idx ].vinstrs )
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{
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if ( !lifters->lift( this, vmp2_code_blocks[ idx ], vinstr, ir_builder.get() ) )
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{
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std::printf(
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"> failed to devirtualize virtual instruction with opcode = %d, handler table rva = 0x%x\n",
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vinstr.opcode, vinstr.trace_data.regs.r12 - vinstr.trace_data.regs.r13 );
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return nullptr;
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}
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}
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}
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// TODO: update this list of optimizations to add more...
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llvm::legacy::FunctionPassManager fpm( llvm_module );
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fpm.add( llvm::createInstructionCombiningPass() );
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fpm.add( llvm::createReassociatePass() );
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fpm.add( llvm::createGVNPass() );
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fpm.add( llvm::createCFGSimplificationPass() );
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fpm.doInitialization();
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fpm.run( *llvm_fptr );
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return llvm_fptr;
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}
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llvm::Value *vmp_rtn_t::compute_sf( std::uint8_t byte_size, llvm::Value *val )
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{
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auto op_size = llvm::IntegerType::get( *llvm_ctx, byte_size * 8 );
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auto msb = ir_builder->CreateLShr( val, ( byte_size * 8 ) - 1 );
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return ir_builder->CreateZExt( msb, llvm::IntegerType::get( *llvm_ctx, 64 ) );
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}
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llvm::Value *vmp_rtn_t::compute_zf( std::uint8_t byte_size, llvm::Value *val )
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{
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auto op_size = llvm::IntegerType::get( *llvm_ctx, byte_size * 8 );
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auto is_zero = ir_builder->CreateICmpEQ( val, llvm::ConstantInt::get( op_size, 0 ) );
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return ir_builder->CreateZExt( is_zero, llvm::IntegerType::get( *llvm_ctx, 64 ) );
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}
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llvm::Value *vmp_rtn_t::compute_pf( std::uint8_t byte_size, llvm::Value *val )
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{
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auto operand_size = llvm::IntegerType::get( *llvm_ctx, byte_size * 8 );
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auto popcount_intrinsic = llvm::Intrinsic::getDeclaration( llvm_module, llvm::Intrinsic::ctpop,
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{ llvm::IntegerType::get( *llvm_ctx, 64 ) } );
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auto lower_bits = ir_builder->CreateIntCast( val, llvm::IntegerType::get( *llvm_ctx, 8 ), false );
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auto extended_bits = ir_builder->CreateZExt( lower_bits, llvm::IntegerType::get( *llvm_ctx, 64 ) );
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return ir_builder->CreateCall( popcount_intrinsic, { extended_bits } );
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}
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llvm::Value *vmp_rtn_t::combine_flags( llvm::Value *cf, llvm::Value *pf, llvm::Value *af, llvm::Value *zf,
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llvm::Value *sf, llvm::Value *of )
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{
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auto shifted_pf = ir_builder->CreateShl( pf, 2, "shifted_pf", true, true );
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auto shifted_af = ir_builder->CreateShl( llvm::ConstantInt::get( llvm::IntegerType::get( *llvm_ctx, 64 ), 0 ),
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4, "shifted_af", true, true ); // treat af as zero
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auto shifted_zf = ir_builder->CreateShl( zf, 6, "shifted_zf", true, true );
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auto shifted_sf = ir_builder->CreateShl( sf, 7, "shifted_sf", true, true );
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auto shifted_of = ir_builder->CreateShl( of, 11, "shifted_of", true, true );
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auto or1 = ir_builder->CreateOr( cf, shifted_of );
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auto or2 = ir_builder->CreateOr( or1, shifted_zf );
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auto or3 = ir_builder->CreateOr( or2, shifted_sf );
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auto or4 = ir_builder->CreateOr( or3, shifted_af );
|
||||
auto or5 = ir_builder->CreateOr( or4, shifted_pf );
|
||||
return ir_builder->CreateXor( or5, llvm::ConstantInt::get( llvm::IntegerType::get( *llvm_ctx, 64 ), 514 ) );
|
||||
}
|
||||
|
||||
} // namespace vm
|
||||
@ -0,0 +1,52 @@
|
||||
#include <vmp_rtn_t.hpp>
|
||||
|
||||
namespace vm
|
||||
{
|
||||
vmp_rtn_t::vmp_rtn_t( std::uintptr_t rtn_begin, std::vector< vm::instrs::code_block_t > vmp2_code_blocks,
|
||||
std::shared_ptr< llvm::IRBuilder<> > &ir_builder, llvm::Module *llvm_module )
|
||||
: ir_builder( ir_builder ), vmp2_code_blocks( vmp2_code_blocks ), rtn_begin( rtn_begin ),
|
||||
llvm_module( llvm_module )
|
||||
{
|
||||
create_routine();
|
||||
// create virtual registers in the first code block...
|
||||
ir_builder->SetInsertPoint( llvm_code_blocks[ 0 ].second );
|
||||
flags = ir_builder->CreateAlloca( ir_builder->getInt64Ty(), nullptr, "flags" );
|
||||
stack = ir_builder->CreateAlloca( llvm::PointerType::get( ir_builder->getInt8Ty(), 0ull ), nullptr, "sp" );
|
||||
ir_builder->CreateStore( llvm_fptr->getArg( 0 ), stack );
|
||||
create_virtual_registers();
|
||||
}
|
||||
|
||||
void vmp_rtn_t::create_virtual_registers( void )
|
||||
{
|
||||
for ( auto idx = 0u; idx < 24; ++idx )
|
||||
// allocate virtual register space...
|
||||
virtual_registers.push_back(
|
||||
ir_builder->CreateAlloca( llvm::IntegerType::get( ir_builder->getContext(), 64 ), nullptr,
|
||||
( std::string( "vreg" ) + std::to_string( idx ) ).c_str() ) );
|
||||
}
|
||||
|
||||
void vmp_rtn_t::create_routine( void )
|
||||
{
|
||||
// function has no arguments and returns void... maybe change this in the future as i learn
|
||||
// more and more LLVM...
|
||||
auto func_ty =
|
||||
llvm::FunctionType::get( llvm::PointerType::getInt8PtrTy( ir_builder->getContext() ),
|
||||
{ llvm::PointerType::getInt8PtrTy( ir_builder->getContext() ) }, false );
|
||||
|
||||
// convert the rtn_begin address to a hex string and prepend "rtn_" to it...
|
||||
std::stringstream rtn_name;
|
||||
rtn_name << "rtn_" << std::hex << rtn_begin;
|
||||
llvm_fptr = llvm::Function::Create( func_ty, llvm::GlobalValue::LinkageTypes::ExternalLinkage,
|
||||
rtn_name.str().c_str(), *llvm_module );
|
||||
|
||||
for ( const auto &vmp2_code_block : vmp2_code_blocks )
|
||||
{
|
||||
// create basic block name... block_xxxxxxxx format...
|
||||
std::stringstream blk_name;
|
||||
blk_name << "blk_" << std::hex << vmp2_code_block.vip_begin;
|
||||
llvm_code_blocks.push_back(
|
||||
{ vmp2_code_block.vip_begin,
|
||||
llvm::BasicBlock::Create( ir_builder->getContext(), blk_name.str().c_str(), llvm_fptr ) } );
|
||||
}
|
||||
}
|
||||
} // namespace vm
|
||||
Loading…
Reference in new issue