GIFT FROM ANITA For those of you who asked:

30 Pages·2013·0.76 MB·English

G A
IFT FROM NITA
For those of you who asked:
http://www.contrib.andrew.cmu.edu/~anitazha/15213_tips.html
A ’ S A
NITA S UPER WESOME
R S
ECITATION LIDES
15/18-213: Introduction to Computer Systems
Assembly and GDB, 4 Feb 2013
Anita Zhang, Section M
M W
ANAGEMENT AND HATNOT
(cid:1) FAQ: http://www.cs.cmu.edu/~213/faq.html
(cid:1) Read this before anything else
It may be updated
(cid:1)
(cid:1) Answers to “Permission denied” errors, etc
(cid:1) Style: http://www.cs.cmu.edu/~213/codeStyle.html
(cid:1) RReeaadd iitt,, ffoollllooww iitt
(cid:1) Style is worth 5-10 points every lab. Don’t lose it.
(cid:1) .vimrc and .emacs configurations help your style
(cid:1) TA Feedback: https://www.ugrad.cs.cmu.edu/ta/feedback
(cid:1) Because we want to make your experience that much better
W ’ A T ?
HAT S ON THE GENDA ODAY
(cid:1) Books (again)
(cid:1) Motivation
(cid:1) Registers
(cid:1) Assembly Instructions
(cid:1) BBoommbbllaabb OOvveerrvviieeww
(cid:1) Bomblab Hints
(cid:1) GDB
(cid:1) Walkthrough
W H Y R ?
HAT AVE OU EAD
(cid:1) Randal E. Bryant and David R. O'Hallaron,
Computer Systems: A Programmer's Perspective,
Second Edition, Prentice Hall, 2011
(cid:1) Brian W. Kernighan and Dennis M. Ritchie,
TThhee CC PPrrooggrraammmmiinngg LLaanngguuaaggee,, SSeeccoonndd EEddiittiioonn,,
Prentice Hall, 1988
(cid:1) Koenig, Andrew. C Traps and Pitfalls. Reading, MA:
Addison-Wesley, 1988
(cid:1) Kernighan, Brian W., and Rob Pike. The Practice of
Programming. Reading, MA: Addison-Wesley, 1999
W A W D T A ?
HY RE E OING HIS GAIN
B M (.. )
ETTER OTIVATION OR NOT
R A T B
EGISTERS AND LL HEM ITS
%rax – 64 bits
%eax – 32 bits
(cid:1) Quad = 64 bits
(cid:1) Doubleword = 32 bits %ax – 16 bits
(cid:1) Word = 16 bits
(cid:1) Byte = 8 bits %ah %al
8 bits 8 bits
These are all parts of the same register
W W ’ W W
HAT E RE ORKING ITH
(cid:1) General Purpose (x86)
(cid:1) Caller Save: %eax, %ecx, %edx
(cid:1) Callee Save: %ebx, %esi, %edi, %ebp, %esp
(cid:1) x86_64 conventions on the next slide
(cid:1)(cid:1) SSppeecciiaallss
(cid:1) %eip – instruction pointer
(cid:1) %ebp – frame pointer
(cid:1) %esp – stack pointer
(cid:1) Conditional Flags
(cid:1) Sit in a special register of its own
(cid:1) Carry (CF), Parity (PF), Zero (ZF), Sign (SF), Overflow
(OF) are the ones you need to worry about
86_64, LOTS R !
X OF EGISTERS
64 bits wide 32 bits wide 16 bitswide 8 bits wide 8 bits wide Use
%rax %eax %ax %ah %al Return Value
%rbx %ebx %bx %bh %bl CalleeSave
%rcx %ecx %cx %ch %cl 4thArgument
%rdx %edx %dx %dh %dl 3rdArgument
%rsi %esi %si %sil 2ndArgument
%rdi %edi %di %dil 1stArgument
%rbp %ebp %bp %bpl CalleeSave
%rsp %esp %sp %spl Stack Pointer
%r8 %r8d %r8w %r8b 5thArgument
%r9 %r9d %r9w %r9b 6thArgument
%r10 %r10d %r10w %r10b CallerSave
%r11 %r11d %r11w %r11b Caller Save
%r12 %r12d %r12w %r12b CalleeSave
%r13 %r13d %r13w %r12b CalleeSave
%r14 %r14d %rw %14b CalleeSave
%r15 %r15d %r15w %15b CalleeSave