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CMU CS 15213 - Lecture

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Machine-Level Programming I: Introduction Sept. 04, 2008IA32 Processorsx86 Evolution: Programmer’s View (Abbreviated)x86 Evolution: Programmer’s ViewNew Species: IA64X86 Evolution: ClonesIntel’s 64-Bit DilemmaOur CoverageAssembly Programmer’s ViewTurning C into Object CodeCompiling Into AssemblyAssembly CharacteristicsObject CodeMachine Instruction ExampleDisassembling Object CodeAlternate DisassemblyWhat Can be Disassembled?Moving Data: IA32movl Operand CombinationsSimple Addressing ModesUsing Simple Addressing ModesUsing Simple Addressing ModesUnderstanding SwapUnderstanding SwapUnderstanding SwapUnderstanding SwapUnderstanding SwapUnderstanding SwapUnderstanding SwapUnderstanding SwapIndexed Addressing ModesAddress Computation ExamplesAddress Computation InstructionSome Arithmetic OperationsSome Arithmetic OperationsUsing leal for Arithmetic ExpressionsUnderstanding arithUnderstanding arithUnderstanding arithUnderstanding arithUnderstanding arithUnderstanding arithAnother ExampleAnother ExampleAnother ExampleAnother ExampleData Representations: IA32 + x86-64x86-64 General Purpose RegistersSwap in 32-bit ModeSwap in 64-bit ModeSwap Long Ints in 64-bit ModeSummaryMachine-Level Programming I:IntroductionSept. 04, 2008Topics Assembly Programmer’s Execution Model Accessing Informationz Registersz Memory Arithmetic operationsclass04.ppt15-213“The course that gives CMU its Zip!”15-213, F’08–2–15-213, F’08IA32 ProcessorsTotally Dominate Computer MarketEvolutionary Design Starting in 1978 with 8086 Added more features as time goes on Still support old features, although obsoleteComplex Instruction Set Computer (CISC) Many different instructions with many different formatsz But, only small subset encountered with Linux programs Hard to match performance of Reduced Instruction Set Computers (RISC) But, Intel has done just that!–3–15-213, F’08x86 Evolution: Programmer’s View(Abbreviated)x86 Evolution: Programmer’s View(Abbreviated)Name Date Transistors8086 1978 29K 16-bit processor. Basis for IBM PC & DOS Limited to 1MB address space. DOS only gives you 640K386 1985 275K Extended to 32 bits. Added “flat addressing” Capable of running Unix Referred to as “IA32” 32-bit Linux/gcc uses no instructions introduced in later models–4–15-213, F’08x86 Evolution: Programmer’s Viewx86 Evolution: Programmer’s ViewMachine Evolution 486 1989 1.9M Pentium 1993 3.1M Pentium/MMX 1997 4.5M PentiumPro 1995 6.5M Pentium III 1999 8.2M Pentium 4 2001 42M Core Duo 2006 291MAdded Features Instructions to support multimedia operationszParallel operations on 1, 2, and 4-byte data, both integer & FP Instructions to enable more efficient conditional operationsLinux/GCC Evolution None!–5–15-213, F’08New Species: IA64New Species: IA64Name Date TransistorsItanium 2001 10M Extends to IA64, a 64-bit architecture Radically new instruction set designed for high performance Can run existing IA32 programszOn-board “x86 engine” Joint project with Hewlett-PackardItanium 2 2002 221M Big performance boostItanium 2 Dual-Core 2006 1.7BItanium has not taken off in marketplace Lack of backward compatibility–6–15-213, F’08X86 Evolution: ClonesX86 Evolution: ClonesAdvanced Micro Devices (AMD) HistoricallyzAMD has followed just behind IntelzA little bit slower, a lot cheaper RecentlyzRecruited top circuit designers from Digital Equipment Corp. andother downward trending companieszExploited fact that Intel distracted by IA64zNow are close competitors to Intel Developed x86-64, its own extension to 64 bitsz Started eating into Intel’s high-end server market–7–15-213, F’08Intel’s 64-Bit DilemmaIntel’s 64-Bit DilemmaIntel Attempted Radical Shift from IA32 to IA64 Totally different architecture Executes IA32 code only as legacy Performance disappointingAMD Stepped in with Evolutionary Solution x86-64 (now called “AMD64”)Intel Felt Obligated to Focus on IA64 Hard to admit mistake or that AMD is better2004: Intel Announces EM64T extension to IA32 Extended Memory 64-bit Technology Almost identical to x86-64! Our Saltwater fish machines–8–15-213, F’08Our CoverageOur CoverageIA32 The traditional x86x86-64 The emerging standardPresentation Book has IA32 Handout has x86-64 Lecture will cover bothLabs Lab #2 x86-64 Lab #3 IA32–9–15-213, F’08Assembly Programmer’s ViewAssembly Programmer’s ViewProgrammer-Visible State PC Program Counterz Address of next instructionz Called “EIP” (IA32) or “RIP” (x86-64) Register Filez Heavily used program data Condition Codesz Store status information about most recent arithmetic operationz Used for conditional branchingPCRegistersCPU MemoryObject CodeProgram DataOS DataAddressesDataInstructionsStackConditionCodes Memoryz Byte addressable arrayz Code, user data, (some) OS dataz Includes stack used to support procedures–10–15-213, F’08texttextbinarybinaryCompiler (gcc -S)Assembler (gcc or as)Linker (gcc or ld)C program (p1.c p2.c)Asm program (p1.s p2.s)Object program (p1.o p2.o)Executable program (p)Static libraries (.a)Turning C into Object CodeTurning C into Object Code Code in files p1.c p2.c Compile with command: gcc -O p1.c p2.c -o pzUse optimizations (-O)zPut resulting binary in file p–11–15-213, F’08Compiling Into AssemblyC Codeint sum(int x, int y){int t = x+y;return t;}Generated IA32 Assembly_sum:pushl %ebpmovl %esp,%ebpmovl 12(%ebp),%eaxaddl 8(%ebp),%eaxmovl %ebp,%esppopl %ebpretObtain with commandgcc -O -S code.cProduces file code.s–12–15-213, F’08Assembly CharacteristicsAssembly CharacteristicsMinimal Data Types “Integer” data of 1, 2, or 4 bytesz Data valuesz Addresses (untyped pointers) Floating point data of 4, 8, or 10 bytes No aggregate types such as arrays or structuresz Just contiguously allocated bytes in memoryPrimitive Operations Perform arithmetic function on register or memory data Transfer data between memory and registerz Load data from memory into registerz Store register data into memory Transfer controlz Unconditional jumps to/from proceduresz Conditional branches–13–15-213, F’08Code for sum0x401040 <sum>:0x550x890xe50x8b0x450x0c0x030x450x080x890xec0x5d0xc3Object CodeObject CodeAssembler Translates .s into .o Binary encoding of each instruction Nearly-complete


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