CSE 351: Week 4. Tom Bergan, TA
|
|
- Lorin French
- 5 years ago
- Views:
Transcription
1 CSE 35 Week 4 Tom Bergan, TA
2 Does this code look okay? int binarysearch(int a[], int length, int key) { int low = 0; int high = length - ; while (low <= high) { int mid = (low + high) / ; int midval = a[mid]; if (midval < key) low = mid + ; else if (midval > key) high = mid - ; else return mid; // key found return -; // key not found
3 Does this code look okay? int binarysearch(int a[], int length, int key) { int low = 0; int high = length - ; while (low <= high) { int mid = (low + high) / ; int midval = a[mid]; if (midval < key) low = What mid + if ; length > 30? else if (midval > key) high = mid - ; else return mid; // key found return -; // key not found 3
4 Does this code look ok? int mid = (low + high) / ; What if length > 30?... then we could have low = 30 = 0x high = 30 + = 0x low + high = 3 + = 0x int midval = a[mid]; Oops, in two s complement, this is a negative number! (low + high) / = 0xC = Crashes because mid < 0 4
5 How can we fix the bug? int mid = (low + high) / ; int mid = low + ((high - low) / ); (There are other ways, but I think this is the simplest to understand) 5
6 This was an actual bug in Java java.util.arrays.binarysearch This bug went unnoticed for years. See http//googleresearch.blogspot.com/006/06/extra-extra-read-all-about-it-nearly.html Understanding binary number representations is important! 6
7 Check your textbook Don t use the international edition! The homework problems are different. 7
8 Today Questions on Hw or Lab? Procedure calls 8
9 Procedure Call Example Caller int z = sum(, ); Callee int sum(int x, int y) { return x + y; 9
10 Procedure Call Example (IA3/Linux) Caller int z = sum(, ); Caller in assembly 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example 0
11 Procedure Call Example (IA3/Linux) Caller int z = sum(, ); Caller in assembly 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example
12 Procedure Call Example (IA3/Linux) Caller int z = sum(, ); Caller in assembly 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example
13 Procedure Call Example (IA3/Linux) Caller int z = sum(, ); Caller in assembly 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example 3
14 Procedure Call Example (IA3/Linux) Callee int sum(int x, int y) { return x + y; Callee in assembly (simple version) movl 8(), %edi movl 4(), %eax addl %edi, %eax ret 8() 4() y x Registers %edi 4
15 Procedure Call Example (IA3/Linux) Callee int sum(int x, int y) { return x + y; Callee in assembly (simple version) movl 8(), %edi movl 4(), %eax addl %edi, %eax ret 8() 4() y x Registers %eax %edi 5
16 Procedure Call Example (IA3/Linux) Callee int sum(int x, int y) { return x + y; Callee in assembly (simple version) movl 8(), %edi movl 4(), %eax addl %edi, %eax ret 8() 4() y x %eax has the return value! Registers %eax 3 %edi 6
17 Procedure Call Example (IA3/Linux) Callee int sum(int x, int y) { return x + y; Callee in assembly (simple version) movl 8(), %edi movl 4(), %eax addl %edi, %eax ret %eax has the return value! Registers %eax 3 y x %edi 7 %eip
18 Procedure Call Example (IA3/Linux) Caller int z = sum(, ); Caller in assembly 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example 8 Registers %eax %edi %eip 3
19 Procedure Call Example (IA3/Linux) Caller int z = sum(, ); Caller in assembly 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example 9 Registers %eax %edi %eip 3
20 Procedure Call Example (IA3/Linux) Caller int z = sum(, ); Problem - What if Caller used %edi before making the call? Caller in assembly 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example 0 Registers %eax %edi %eip 3
21 Procedure Call Example (IA3/Linux) Caller int d = 5; int z = sum(, ); Problem - What if Caller used %edi before making the call? Caller in assembly 0x7fff movl $5, %edi 0x800 pushl $ 0x8005 pushl $ 0x8009 call sum addl $8, *note these instruction addresses are completely made up for this example sum() overwrote %edi! Need to save... Registers %eax %edi %eip 3
22 Saving Registers Some are caller save - IA3 %eax, %edx, %ecx - These are very commonly used (caller should expect they will be clobbered) Some are callee save - IA3 %ebx, %edi, %esi - These are less commonly used from prior example
23 Callee Procedure Call Example (IA3/Linux) Callee in assembly (better version) setup body int sum(int x, int y) { return x + y; pushl %ebp movl, %ebp pushl %edi movl (%ebp), %edi movl 8(%ebp), %eax addl %edi, %eax %ebp y x cleanup movl (), %edi movl %ebp, popl %ebp ret 3
24 Callee Procedure Call Example (IA3/Linux) int sum(int x, int y) { return x + y; Callee in assembly (better version) setup body pushl %ebp movl, %ebp pushl %edi movl (%ebp), %edi movl 8(%ebp), %eax addl %edi, %eax %ebp old %ebp y x cleanup movl (), %edi movl %ebp, popl %ebp ret 4
25 Callee Procedure Call Example (IA3/Linux) int sum(int x, int y) { return x + y; Callee in assembly (better version) setup body cleanup pushl %ebp movl, %ebp pushl %edi movl (%ebp), %edi movl 8(%ebp), %eax addl %edi, %eax movl (), %edi movl %ebp, popl %ebp ret 5 %ebp old %ebp y x
26 Callee Procedure Call Example (IA3/Linux) int sum(int x, int y) { return x + y; Callee in assembly (better version) setup body cleanup pushl %ebp movl, %ebp pushl %edi movl (%ebp), %edi movl 8(%ebp), %eax addl %edi, %eax movl (), %edi movl %ebp, popl %ebp ret %ebp old %ebp old %edi saved %edi y x 6
27 Callee Procedure Call Example (IA3/Linux) int sum(int x, int y) { return x + y; Callee in assembly (better version) setup body cleanup pushl %ebp movl, %ebp pushl %edi movl (%ebp), %edi movl 8(%ebp), %eax addl %edi, %eax movl (), %edi movl %ebp, popl %ebp ret 7 (%ebp) 8(%ebp) %ebp old %ebp old %edi Key %ebp is fixed for the entire function y x
28 Callee Procedure Call Example (IA3/Linux) int sum(int x, int y) { return x + y; Callee in assembly (better version) setup body cleanup pushl %ebp movl, %ebp pushl %edi movl (%ebp), %edi movl 8(%ebp), %eax addl %edi, %eax movl (), %edi movl %ebp, popl %ebp ret (%ebp) 8(%ebp) %ebp restoring %edi old %ebp old %edi y x 8
29 Callee Procedure Call Example (IA3/Linux) int sum(int x, int y) { return x + y; Callee in assembly (better version) setup body cleanup pushl %ebp movl, %ebp pushl %edi movl (%ebp), %edi movl 8(%ebp), %eax addl %edi, %eax movl (), %edi movl %ebp, popl %ebp ret %ebp restoring %ebp old %ebp old %edi y x 9
30 Callee Why use a frame pointer? (%ebp) int sum(int x, int y) { return x + y; To make debugging easier - may move - %ebp is fixed Your compiler emits a symbol map y (%ebp) x 8(%ebp) gdb uses this map when you write print x (%ebp) 8(%ebp) %ebp old %ebp old %edi y x 30
31 Aside how does gdb s backtrace work? Follow return addresses! - use old %ebp to find prior frame Pseudocode while (pc is not in main ) { pc = 4(%ebp) %ebp = (%ebp) (%ebp) 8(%ebp) 4(%ebp) %ebp old %ebp old %edi y x 3
32 How is x86-64 different? Pass the first six arguments in registers - In this order %rdi,%rsi,%rdx,%rcx,%r8,%r9 New register save convention - Callee save %rbx,%rbp,%r,%r3,%r4,%r5 - Others are caller save By default, gcc omits the frame pointer - It has to emit more complex debug info (e.g., the location of argument x relative to can change) 3
33 Procedure Call Example (x86-64/linux) Caller int z = sum(, ); Caller in assembly movl $, %edi movl $, %esi call sum edi not rdi because int is 3-bits Callee int sum(int x, int y) { return x + y; Callee in assembly addl %esi, %edi movl %edi, %eax ret x86-64 with gcc does not use a frame pointer 33 Tip you can force gcc to emit code with a frame pointer using gcc -fno-omit-frame-pointer
Assembly Language: Function Calls
Assembly Language: Function Calls 1 Goals of this Lecture Help you learn: Function call problems: Calling and returning Passing parameters Storing local variables Handling registers without interference
More informationAssembly Language: Function Calls" Goals of this Lecture"
Assembly Language: Function Calls" 1 Goals of this Lecture" Help you learn:" Function call problems:" Calling and returning" Passing parameters" Storing local variables" Handling registers without interference"
More informationAssembly Language: Function Calls" Goals of this Lecture"
Assembly Language: Function Calls" 1 Goals of this Lecture" Help you learn:" Function call problems:" Calling and urning" Passing parameters" Storing local variables" Handling registers without interference"
More informationCS 31: Intro to Systems Functions and the Stack. Martin Gagne Swarthmore College February 23, 2016
CS 31: Intro to Systems Functions and the Stack Martin Gagne Swarthmore College February 23, 2016 Reminders Late policy: you do not have to send me an email to inform me of a late submission before the
More informationAssembly Language: Function Calls. Goals of this Lecture. Function Call Problems
Assembly Language: Function Calls 1 Goals of this Lecture Help you learn: Function call problems: Calling and urning Passing parameters Storing local variables Handling registers without interference Returning
More informationCS213. Machine-Level Programming III: Procedures
CS213 Machine-Level Programming III: Procedures Topics IA32 stack discipline Register saving conventions Creating pointers to local variables IA32 Region of memory managed with stack discipline Grows toward
More informationMachine-level Programming (3)
Machine-level Programming (3) Procedures A: call A call A return Two issues How to return to the correct position? How to pass arguments and return values between callee to caller? 2 Procedure Control
More informationX86 Stack Calling Function POV
X86 Stack Calling Function POV Computer Systems Section 3.7 Stack Frame Reg Value ebp xffff FFF0 esp xffff FFE0 eax x0000 000E Memory Address Value xffff FFF8 xffff FFF4 x0000 0004 xffff FFF4 x0000 0003
More informationAssembly III: Procedures. Jin-Soo Kim Computer Systems Laboratory Sungkyunkwan University
Assembly III: Procedures Jin-Soo Kim (jinsookim@skku.edu) Computer Systems Laboratory Sungkyunkwan University http://csl.skku.edu IA-32 (1) Characteristics Region of memory managed with stack discipline
More informationQuestion 4.2 2: (Solution, p 5) Suppose that the HYMN CPU begins with the following in memory. addr data (translation) LOAD 11110
Questions 1 Question 4.1 1: (Solution, p 5) Define the fetch-execute cycle as it relates to a computer processing a program. Your definition should describe the primary purpose of each phase. Question
More informationCS 33: Week 3 Discussion. x86 Assembly (v1.0) Section 1G
CS 33: Week 3 Discussion x86 Assembly (v1.0) Section 1G Announcements - HW2 due Sunday - MT1 this Thursday! - Lab2 out Info Name: Eric Kim (Section 1G, 2-4 PM, BH 5419) Office Hours (Boelter 2432) - Wed
More informationMachine-Level Programming III: Procedures
Machine-Level Programming III: Procedures IA32 Region of memory managed with stack discipline Grows toward lower addresses Register indicates lowest stack address address of top element Bottom Increasing
More informationFunction Calls COS 217. Reading: Chapter 4 of Programming From the Ground Up (available online from the course Web site)
Function Calls COS 217 Reading: Chapter 4 of Programming From the Ground Up (available online from the course Web site) 1 Goals of Today s Lecture Finishing introduction to assembly language o EFLAGS register
More informationASSEMBLY III: PROCEDURES. Jo, Heeseung
ASSEMBLY III: PROCEDURES Jo, Heeseung IA-32 STACK (1) Characteristics Region of memory managed with stack discipline Grows toward lower addresses Register indicates lowest stack address - address of top
More informationAssembly III: Procedures. Jo, Heeseung
Assembly III: Procedures Jo, Heeseung IA-32 Stack (1) Characteristics Region of memory managed with stack discipline Grows toward lower addresses Register indicates lowest stack address - address of top
More informationProcedure Calls. Young W. Lim Sat. Young W. Lim Procedure Calls Sat 1 / 27
Procedure Calls Young W. Lim 2016-11-05 Sat Young W. Lim Procedure Calls 2016-11-05 Sat 1 / 27 Outline 1 Introduction References Stack Background Transferring Control Register Usage Conventions Procedure
More informationThe course that gives CMU its Zip! Machine-Level Programming III: Procedures Sept. 17, 2002
15-213 The course that gives CMU its Zip! Machine-Level Programming III: Procedures Sept. 17, 2002 Topics IA32 stack discipline Register saving conventions Creating pointers to local variables class07.ppt
More informationCPEG421/621 Tutorial
CPEG421/621 Tutorial Compiler data representation system call interface calling convention Assembler object file format object code model Linker program initialization exception handling relocation model
More informationMachine Programming 3: Procedures
Machine Programming 3: Procedures CS61, Lecture 5 Prof. Stephen Chong September 15, 2011 Announcements Assignment 2 (Binary bomb) due next week If you haven t yet please create a VM to make sure the infrastructure
More informationCSC 2400: Computing Systems. X86 Assembly: Function Calls"
CSC 24: Computing Systems X86 Assembly: Function Calls" 1 Lecture Goals! Challenges of supporting functions" Providing information for the called function" Function arguments and local variables" Allowing
More informationProcedure Calls. Young W. Lim Mon. Young W. Lim Procedure Calls Mon 1 / 29
Procedure Calls Young W. Lim 2017-08-21 Mon Young W. Lim Procedure Calls 2017-08-21 Mon 1 / 29 Outline 1 Introduction Based on Stack Background Transferring Control Register Usage Conventions Procedure
More informationStack Discipline Jan. 19, 2018
15-410 An Experience Like No Other Discipline Jan. 19, 2018 Dave Eckhardt Brian Railing Slides originally stolen from 15-213 1 15-410, S 18 Synchronization Registration The wait list will probably be done
More informationCPS104 Recitation: Assembly Programming
CPS104 Recitation: Assembly Programming Alexandru Duțu 1 Facts OS kernel and embedded software engineers use assembly for some parts of their code some OSes had their entire GUIs written in assembly in
More informationCS241 Computer Organization Spring 2015 IA
CS241 Computer Organization Spring 2015 IA-32 2-10 2015 Outline! Review HW#3 and Quiz#1! More on Assembly (IA32) move instruction (mov) memory address computation arithmetic & logic instructions (add,
More informationCSC 2400: Computing Systems. X86 Assembly: Function Calls
CSC 24: Computing Systems X86 Assembly: Function Calls 1 Lecture Goals Challenges of supporting functions Providing information for the called function Function arguments and local variables Allowing the
More informationSystems I. Machine-Level Programming V: Procedures
Systems I Machine-Level Programming V: Procedures Topics abstraction and implementation IA32 stack discipline Procedural Memory Usage void swap(int *xp, int *yp) int t0 = *xp; int t1 = *yp; *xp = t1; *yp
More informationRegion of memory managed with stack discipline Grows toward lower addresses. Register %esp contains lowest stack address = address of top element
Machine Representa/on of Programs: Procedures Instructors: Sanjeev Se(a 1 IA32 Stack Region of memory managed with stack discipline Grows toward lower addresses Stack BoGom Increasing Addresses Register
More informationAn Experience Like No Other. Stack Discipline Aug. 30, 2006
15-410 An Experience Like No Other Discipline Aug. 30, 2006 Bruce Maggs Dave Eckhardt Slides originally stolen from 15-213 15-410, F 06 Synchronization Registration If you're here but not registered, please
More informationCS 31: Intro to Systems ISAs and Assembly. Martin Gagné Swarthmore College February 7, 2017
CS 31: Intro to Systems ISAs and Assembly Martin Gagné Swarthmore College February 7, 2017 ANNOUNCEMENT All labs will meet in SCI 252 (the robot lab) tomorrow. Overview How to directly interact with hardware
More informationCMSC 313 Lecture 12. Project 3 Questions. How C functions pass parameters. UMBC, CMSC313, Richard Chang
Project 3 Questions CMSC 313 Lecture 12 How C functions pass parameters UMBC, CMSC313, Richard Chang Last Time Stack Instructions: PUSH, POP PUSH adds an item to the top of the stack POP
More informationCOMP 210 Example Question Exam 2 (Solutions at the bottom)
_ Problem 1. COMP 210 Example Question Exam 2 (Solutions at the bottom) This question will test your ability to reconstruct C code from the assembled output. On the opposing page, there is asm code for
More informationHomework. In-line Assembly Code Machine Language Program Efficiency Tricks Reading PAL, pp 3-6, Practice Exam 1
Homework In-line Assembly Code Machine Language Program Efficiency Tricks Reading PAL, pp 3-6, 361-367 Practice Exam 1 1 In-line Assembly Code The gcc compiler allows you to put assembly instructions in-line
More informationRegister Allocation, iii. Bringing in functions & using spilling & coalescing
Register Allocation, iii Bringing in functions & using spilling & coalescing 1 Function Calls ;; f(x) = let y = g(x) ;; in h(y+x) + y*5 (:f (x
More informationX86 Assembly -Procedure II:1
X86 Assembly -Procedure II:1 IA32 Object Code Setup Label.L61 becomes address 0x8048630 Label.L62 becomes address 0x80488dc Assembly Code switch_eg:... ja.l61 # if > goto default jmp *.L62(,%edx,4) # goto
More informationadministrivia today start assembly probably won t finish all these slides Assignment 4 due tomorrow any questions?
administrivia today start assembly probably won t finish all these slides Assignment 4 due tomorrow any questions? exam on Wednesday today s material not on the exam 1 Assembly Assembly is programming
More informationLab 10: Introduction to x86 Assembly
CS342 Computer Security Handout # 8 Prof. Lyn Turbak Wednesday, Nov. 07, 2012 Wellesley College Revised Nov. 09, 2012 Lab 10: Introduction to x86 Assembly Revisions: Nov. 9 The sos O3.s file on p. 10 was
More informationInstruction Set Architectures
Instruction Set Architectures! ISAs! Brief history of processors and architectures! C, assembly, machine code! Assembly basics: registers, operands, move instructions 1 What should the HW/SW interface
More information4) C = 96 * B 5) 1 and 3 only 6) 2 and 4 only
Instructions: The following questions use the AT&T (GNU) syntax for x86-32 assembly code, as in the course notes. Submit your answers to these questions to the Curator as OQ05 by the posted due date and
More informationW4118: PC Hardware and x86. Junfeng Yang
W4118: PC Hardware and x86 Junfeng Yang A PC How to make it do something useful? 2 Outline PC organization x86 instruction set gcc calling conventions PC emulation 3 PC board 4 PC organization One or more
More informationx86 assembly CS449 Fall 2017
x86 assembly CS449 Fall 2017 x86 is a CISC CISC (Complex Instruction Set Computer) e.g. x86 Hundreds of (complex) instructions Only a handful of registers RISC (Reduced Instruction Set Computer) e.g. MIPS
More informationIA32 Stack. Stack BoDom. Region of memory managed with stack discipline Grows toward lower addresses. Register %esp contains lowest stack address
IA32 Procedures 1 IA32 Stack Region of memory managed with stack discipline Grows toward lower addresses Stack BoDom Increasing Addresses Register contains lowest stack address address of top element Stack
More informationImplementing Threads. Operating Systems In Depth II 1 Copyright 2018 Thomas W. Doeppner. All rights reserved.
Implementing Threads Operating Systems In Depth II 1 Copyright 2018 Thomas W Doeppner All rights reserved The Unix Address Space stack dynamic bss data text Operating Systems In Depth II 2 Copyright 2018
More informationSimple C Program. Assembly Ouput. Using GCC to produce Assembly. Assembly produced by GCC is easy to recognize:
Simple C Program Helloworld.c Programming and Debugging Assembly under Linux slides by Alexandre Denault int main(int argc, char *argv[]) { } printf("hello World"); Programming and Debugging Assembly under
More informationX86 Review Process Layout, ISA, etc. CS642: Computer Security. Drew Davidson
X86 Review Process Layout, ISA, etc. CS642: Computer Security Drew Davidson davidson@cs.wisc.edu From Last Time ACL-based permissions (UNIX style) Read, Write, execute can be restricted on users and groups
More information211: Computer Architecture Summer 2016
211: Computer Architecture Summer 2016 Liu Liu Topic: Assembly Programming Storage - Assembly Programming: Recap - project2 - Structure/ Array Representation - Structure Alignment Rutgers University Liu
More informationSystem Programming and Computer Architecture (Fall 2009)
System Programming and Computer Architecture (Fall 2009) Recitation 2 October 8 th, 2009 Zaheer Chothia Email: zchothia@student.ethz.ch Web: http://n.ethz.ch/~zchothia/ Topics for Today Classroom Exercise
More informationAS08-C++ and Assembly Calling and Returning. CS220 Logic Design AS08-C++ and Assembly. AS08-C++ and Assembly Calling Conventions
CS220 Logic Design Outline Calling Conventions Multi-module Programs 1 Calling and Returning We have already seen how the call instruction is used to execute a subprogram. call pushes the address of the
More informationCS642: Computer Security
X86 Review Process Layout, ISA, etc. CS642: Computer Security Drew Davidson davidson@cs.wisc.edu From Last Week ACL- based permissions (UNIX style) Read, Write, execute can be restricted on users and groups
More informationCMSC 313 COMPUTER ORGANIZATION & ASSEMBLY LANGUAGE PROGRAMMING
CMSC 313 COMPUTER ORGANIZATION & ASSEMBLY LANGUAGE PROGRAMMING LECTURE 16, SPRING 2013 TOPICS TODAY Project 6 Perils & Pitfalls of Memory Allocation C Function Call Conventions in Assembly Language PERILS
More informationLecture 4 CIS 341: COMPILERS
Lecture 4 CIS 341: COMPILERS CIS 341 Announcements HW2: X86lite Available on the course web pages. Due: Weds. Feb. 7 th at midnight Pair-programming project Zdancewic CIS 341: Compilers 2 X86 Schematic
More informationCompiler Construction D7011E
Compiler Construction D7011E Lecture 8: Introduction to code generation Viktor Leijon Slides largely by Johan Nordlander with material generously provided by Mark P. Jones. 1 What is a Compiler? Compilers
More informationICS143A: Principles of Operating Systems. Midterm recap, sample questions. Anton Burtsev February, 2017
ICS143A: Principles of Operating Systems Midterm recap, sample questions Anton Burtsev February, 2017 Describe the x86 address translation pipeline (draw figure), explain stages. Address translation What
More informationx86 Assembly Crash Course Don Porter
x86 Assembly Crash Course Don Porter Registers ò Only variables available in assembly ò General Purpose Registers: ò EAX, EBX, ECX, EDX (32 bit) ò Can be addressed by 8 and 16 bit subsets AL AH AX EAX
More informationANITA S SUPER AWESOME RECITATION SLIDES
ANITA S SUPER AWESOME RECITATION SLIDES 15/18-213: Introduction to Computer Systems Stacks and Buflab, 11 Jun 2013 Anita Zhang, Section M WHAT S NEW (OR NOT) Bomblab is due tonight, 11:59 PM EDT Your late
More informationYou may work with a partner on this quiz; both of you must submit your answers.
Instructions: Choose the best answer for each of the following questions. It is possible that several answers are partially correct, but one answer is best. It is also possible that several answers are
More informationMachine- Level Programming III: Switch Statements and IA32 Procedures
Machine- Level Programming III: Switch Statements and IA32 Procedures CS 485: Systems Programming Fall 2015 Instructor: James Griffioen Adapted from slides by R. Bryant and D. O Hallaron (hjp://csapp.cs.cmu.edu/public/instructors.html)
More informationStack -- Memory which holds register contents. Will keep the EIP of the next address after the call
Call without Parameter Value Transfer What are involved? ESP Stack Pointer Register Grows by 4 for EIP (return address) storage Stack -- Memory which holds register contents Will keep the EIP of the next
More informationSungkyunkwan University
Switch statements IA 32 Procedures Stack Structure Calling Conventions Illustrations of Recursion & Pointers long switch_eg (long x, long y, long z) { long w = 1; switch(x) { case 1: w = y*z; break; case
More informationECE 391 Exam 1 Review Session - Spring Brought to you by HKN
ECE 391 Exam 1 Review Session - Spring 2018 Brought to you by HKN DISCLAIMER There is A LOT (like a LOT) of information that can be tested for on the exam, and by the nature of the course you never really
More informationMachine Program: Procedure. Zhaoguo Wang
Machine Program: Procedure Zhaoguo Wang Requirements of procedure calls? P() { y = Q(x); y++; 1. Passing control int Q(int i) { int t, z; return z; Requirements of procedure calls? P() { y = Q(x); y++;
More informationUniversity of Washington
Roadmap C: car *c = malloc(sizeof(car)); c->miles = 100; c->gals = 17; float mpg = get_mpg(c); free(c); Assembly language: Machine code: Computer system: get_mpg: pushq %rbp movq %rsp, %rbp... popq %rbp
More informationInstructor: Alvin R. Lebeck
X86 Assembly Programming with GNU assembler Lecture 7 Instructor: Alvin R. Lebeck Some Slides based on those from Randy Bryant and Dave O Hallaron Admin Reading: Chapter 3 Note about pointers: You must
More informationMACHINE-LEVEL PROGRAMMING I: BASICS COMPUTER ARCHITECTURE AND ORGANIZATION
MACHINE-LEVEL PROGRAMMING I: BASICS COMPUTER ARCHITECTURE AND ORGANIZATION Today: Machine Programming I: Basics History of Intel processors and architectures C, assembly, machine code Assembly Basics:
More informationCSC 2400: Computer Systems. Using the Stack for Function Calls
CSC 24: Computer Systems Using the Stack for Function Calls Lecture Goals Challenges of supporting functions! Providing information for the called function Function arguments and local variables! Allowing
More informationBinghamton University. CS-220 Spring X86 Debug. Computer Systems Section 3.11
X86 Debug Computer Systems Section 3.11 GDB is a Source Level debugger We have learned how to debug at the C level Now, C has been translated to X86 assembler! How does GDB play the shell game? Makes it
More informationSYSTEM CALL IMPLEMENTATION. CS124 Operating Systems Fall , Lecture 14
SYSTEM CALL IMPLEMENTATION CS124 Operating Systems Fall 2017-2018, Lecture 14 2 User Processes and System Calls Previously stated that user applications interact with the kernel via system calls Typically
More informationCSC 8400: Computer Systems. Using the Stack for Function Calls
CSC 84: Computer Systems Using the Stack for Function Calls Lecture Goals Challenges of supporting functions! Providing information for the called function Function arguments and local variables! Allowing
More informationWhat is a Compiler? Compiler Construction SMD163. Why Translation is Needed: Know your Target: Lecture 8: Introduction to code generation
Compiler Construction SMD163 Lecture 8: Introduction to code generation Viktor Leijon & Peter Jonsson with slides by Johan Nordlander Contains material generously provided by Mark P. Jones What is a Compiler?
More informationProgram Exploitation Intro
Program Exploitation Intro x86 Assembly 04//2018 Security 1 Univeristà Ca Foscari, Venezia What is Program Exploitation "Making a program do something unexpected and not planned" The right bugs can be
More informationInstruction Set Architectures
Instruction Set Architectures ISAs Brief history of processors and architectures C, assembly, machine code Assembly basics: registers, operands, move instructions 1 What should the HW/SW interface contain?
More informationCS241 Computer Organization Spring Loops & Arrays
CS241 Computer Organization Spring 2015 Loops & Arrays 2-26 2015 Outline! Loops C loops: while, for, do-while Translation to jump to middle! Arrays Read: CS:APP2 Chapter 3, sections 3.6 3.7 IA32 Overview
More informationCSC 2400: Computer Systems. Using the Stack for Function Calls
CSC 24: Computer Systems Using the Stack for Function Calls Lecture Goals Challenges of supporting functions! Providing information for the called function Function arguments and local variables! Allowing
More informationProcess Layout and Function Calls
Process Layout and Function Calls CS 6 Spring 07 / 8 Process Layout in Memory Stack grows towards decreasing addresses. is initialized at run-time. Heap grow towards increasing addresses. is initialized
More informationSee P&H 2.8 and 2.12, and A.5-6. Prof. Hakim Weatherspoon CS 3410, Spring 2015 Computer Science Cornell University
See P&H 2.8 and 2.12, and A.5-6 Prof. Hakim Weatherspoon CS 3410, Spring 2015 Computer Science Cornell University Upcoming agenda PA1 due yesterday PA2 available and discussed during lab section this week
More information143A: Principles of Operating Systems. Lecture 5: Calling conventions. Anton Burtsev January, 2017
143A: Principles of Operating Systems Lecture 5: Calling conventions Anton Burtsev January, 2017 Stack and procedure calls Stack Main purpose: Store the return address for the current procedure Caller
More informationInstruction Set Architecture
CS:APP Chapter 4 Computer Architecture Instruction Set Architecture Randal E. Bryant adapted by Jason Fritts http://csapp.cs.cmu.edu CS:APP2e Hardware Architecture - using Y86 ISA For learning aspects
More informationIA32 Stack. Lecture 5 Machine-Level Programming III: Procedures. IA32 Stack Popping. IA32 Stack Pushing. Topics. Pushing. Popping
Lecture 5 Machine-Level Programming III: Procedures Topics IA32 stack discipline Register saving conventions Creating pointers to local variables IA32 Region of memory managed with stack discipline Grows
More informationCS 31: Intro to Systems ISAs and Assembly. Kevin Webb Swarthmore College September 25, 2018
CS 31: Intro to Systems ISAs and Assembly Kevin Webb Swarthmore College September 25, 2018 Overview How to directly interact with hardware Instruction set architecture (ISA) Interface between programmer
More informationCalling Conventions. See P&H 2.8 and Hakim Weatherspoon CS 3410, Spring 2013 Computer Science Cornell University
Calling Conventions See P&H 2.8 and 2.12 Hakim Weatherspoon CS 3410, Spring 2013 Computer Science Cornell University Goals for Today Review: Calling Conventions call a routine (i.e. transfer control to
More informationMachine-level Representation of Programs. Jin-Soo Kim Computer Systems Laboratory Sungkyunkwan University
Machine-level Representation of Programs Jin-Soo Kim (jinsookim@skku.edu) Computer Systems Laboratory Sungkyunkwan University http://csl.skku.edu Program? 짬뽕라면 준비시간 :10 분, 조리시간 :10 분 재료라면 1개, 스프 1봉지, 오징어
More informationAssembly Programmer s View Lecture 4A Machine-Level Programming I: Introduction
Assembly Programmer s View Lecture 4A Machine-Level Programming I: Introduction E I P CPU isters Condition Codes Addresses Data Instructions Memory Object Code Program Data OS Data Topics Assembly Programmer
More informationIA32 Stack The course that gives CMU its Zip! Machine-Level Programming III: Procedures Sept. 17, IA32 Stack Popping. IA32 Stack Pushing
15-213 The course that gives CMU its Zip! Machine-Level Programming III: Procedures Sept. 17, 2002 Topics IA32 stack discipline Register saving conventions Creating pointers to local variables IA32 Region
More informationhnp://
The bots face off in a tournament against one another and about an equal number of humans, with each player trying to score points by elimina&ng its opponents. Each player also has a "judging gun" in addi&on
More informationThe Hardware/Software Interface CSE351 Spring 2013
The Hardware/Software Interface CSE351 Spring 2013 x86 Programming II 2 Today s Topics: control flow Condition codes Conditional and unconditional branches Loops 3 Conditionals and Control Flow A conditional
More informationCMSC 313 Lecture 12 [draft] How C functions pass parameters
CMSC 313 Lecture 12 [draft] How C functions pass parameters UMBC, CMSC313, Richard Chang Last Time Stack Instructions: PUSH, POP PUSH adds an item to the top of the stack POP removes an
More informationMachine-Level Programming II: Control and Arithmetic
Machine-Level Programming II: Control and Arithmetic CSCI 2400: Computer Architecture Instructor: David Ferry Slides adapted from Bryant & O Hallaron s slides 1 Today Complete addressing mode, address
More informationIntel assembly language using gcc
QOTD Intel assembly language using gcc Assembly language programming is difficult. Make no mistake about that. It is not for wimps and weaklings. - Tanenbaum s 6th, page 519 These notes are a supplement
More informationGiving credit where credit is due
CSCE 230J Computer Organization Machine-Level Programming III: Procedures Dr. Steve Goddard goddard@cse.unl.edu Giving credit where credit is due Most of slides for this lecture are based on slides created
More informationAssignment 11: functions, calling conventions, and the stack
Assignment 11: functions, calling conventions, and the stack ECEN 4553 & 5013, CSCI 4555 & 5525 Prof. Jeremy G. Siek December 5, 2008 The goal of this week s assignment is to remove function definitions
More informationWhat the CPU Sees Basic Flow Control Conditional Flow Control Structured Flow Control Functions and Scope. C Flow Control.
C Flow Control David Chisnall February 1, 2011 Outline What the CPU Sees Basic Flow Control Conditional Flow Control Structured Flow Control Functions and Scope Disclaimer! These slides contain a lot of
More informationCS61 Section Solutions 3
CS61 Section Solutions 3 (Week of 10/1-10/5) 1. Assembly Operand Specifiers 2. Condition Codes 3. Jumps 4. Control Flow Loops 5. Procedure Calls 1. Assembly Operand Specifiers Q1 Operand Value %eax 0x104
More informationProcesses (Intro) Yannis Smaragdakis, U. Athens
Processes (Intro) Yannis Smaragdakis, U. Athens Process: CPU Virtualization Process = Program, instantiated has memory, code, current state What kind of memory do we have? registers + address space Let's
More informationCIT Week13 Lecture
CIT 3136 - Week13 Lecture Runtime Environments During execution, allocation must be maintained by the generated code that is compatible with the scope and lifetime rules of the language. Typically there
More informationTurning C into Object Code Code in files p1.c p2.c Compile with command: gcc -O p1.c p2.c -o p Use optimizations (-O) Put resulting binary in file p
Turning C into Object Code Code in files p1.c p2.c Compile with command: gcc -O p1.c p2.c -o p Use optimizations (-O) Put resulting binary in file p text C program (p1.c p2.c) Compiler (gcc -S) text Asm
More informationCS 31: Intro to Systems ISAs and Assembly. Kevin Webb Swarthmore College February 9, 2016
CS 31: Intro to Systems ISAs and Assembly Kevin Webb Swarthmore College February 9, 2016 Reading Quiz Overview How to directly interact with hardware Instruction set architecture (ISA) Interface between
More informationCNIT 127: Exploit Development. Ch 3: Shellcode. Updated
CNIT 127: Exploit Development Ch 3: Shellcode Updated 1-30-17 Topics Protection rings Syscalls Shellcode nasm Assembler ld GNU Linker objdump to see contents of object files strace System Call Tracer Removing
More informationCSE2421 FINAL EXAM SPRING Name KEY. Instructions: Signature
CSE2421 FINAL EXAM SPRING 2013 Name KEY Instructions: This is a closed-book, closed-notes, closed-neighbor exam. Only a writing utensil is needed for this exam. No calculators allowed. If you need to go
More informationMachine Programming 1: Introduction
Machine Programming 1: Introduction CS61, Lecture 3 Prof. Stephen Chong September 8, 2011 Announcements (1/2) Assignment 1 due Tuesday Please fill in survey by 5pm today! Assignment 2 will be released
More informationAusgewählte Betriebssysteme. Anatomy of a system call
Ausgewählte Betriebssysteme Anatomy of a system call 1 User view #include int main(void) { printf( Hello World!\n ); return 0; } 2 3 Syscall (1) User: write(fd, buffer, sizeof(buffer)); size
More information143A: Principles of Operating Systems. Lecture 4: Calling conventions. Anton Burtsev October, 2017
143A: Principles of Operating Systems Lecture 4: Calling conventions Anton Burtsev October, 2017 Recap from last time Stack and procedure calls What is stack? Stack It's just a region of memory Pointed
More information