[PDF] [PDF] Machine-‐Level Programming I: Basics

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assembly and machine language, nor indeed how they differ from BASIC What ever hard to learn, just that computer people like to keep the public at large "in  

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stored at the lowest memory address Figure 2 Machine code Study the Instruction Set of the MicroBlaze processor What does the instruction “addk r1, r19, 

[PDF] Machine-‐Level Programming I: Basics

Examples: cache sizes and core frequency □ Code Forms: ▫ Machine Code: The byte-‐level programs that a processor executes ▫ Assembly 

[PDF] Machine-‐Level Programming I: Basics

15 sept 2015 · Examples: cache sizes and core frequency □ Code Forms: ▫ Machine Code: The byte-‐level programs that a processor executes ▫ Assembly 

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And special thanks to Jim : i Butterfield for his maps, programs, and constant encourage- 1—> ment to everyone who decides to learn 6502 machine language

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9 shark> gcc hello.c shark> gcc -m64 hello.c

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13 gcc -Og -S gccas gcc ld p1.c p2.c p1.s p2.s p1.o p2.o p .a p1.c p2.c gcc -Og p1.c p2.c -o p -Og p

Carnegie Mellon

14 long plus(long x, long y); void sumstore (long x, long y, long * dest long t = plus(x, y); dest = t; sumstore pushq rbx movq rdx rbx call plus movq rax rbx popq rbx ret gcc Og -S sum.c sum.s

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17 sumstore

0x0400595:

0x53 0x48 0x89 0xd3 0xe8 0xf2 0xff 0xff 0xff 0x48 0x89 0x03 0x5b 0xc3 .s.o mallocprintf

0x0400595

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18 t dest t %rax dest %rbx dest %rbx]

0x40059e

dest = t; movq rax rbx

0x40059e: 48 89 03

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19 objdump -d sum a.out.o

0000000000400595 <

sumstore

400595: 53 push %

rbx

400596: 48 89 d3

mov rdx rbx

400599: e8 f2

ff ff ff callq

400590

40059e: 48 89 03

mov rax rbx

4005a1: 5b pop %

rbx

4005a2: c3

retq

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Dump of assembler code for function

sumstore

0x0000000000400595 <+0>: push %

rbx

0x0000000000400596 <+1>:

mov rdx rbx

0x0000000000400599 <+4>:

callq

0x400590

0x000000000040059e <+9>:

mov rax rbx

0x00000000004005a1 <+12>:pop %

rbx

0x00000000004005a2 <+13>:

retq gdb sum disassemble sumstore x/14xb sumstore sumstore

0x0400595:

0x53 0x48 0x89 0xd3 0xe8 0xf2 0xff 0xff 0xff 0x48 0x89 0x03 0x5b 0xc3

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objdump d

WINWORD.EXE

WINWORD.EXE: file format pei-i386

No symbols in "WINWORD.EXE".

Disassembly of section .text:

30001000 <.text>:

30001000: 55 push %

ebp

30001001: 8b

ec mov esp,%ebp

30001003: 6a ff push $0xffffffff

30001005: 68 90 10 00 30 push $0x30001090

3000100a: 68 91 dc 4c 30 push $0x304cdc91

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%rsp %eax %ebx %ecx %edx %esi %edi %esp %ebp %r8d %r9d %r10d %r11d %r12d %r13d %r14d %r15d %r8 %r9 %r10 %r11 %r12 %r13 %r14 %r15 rax rbx %rcx %rdx %rsi %rdi %rbp

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eax ecx edx %ebx %esi %edi %esp %ebp %ax cx dx bx si di %sp bp %ah ch %dh bh %al cl %dl bl accumulate counter dataquotesdbs_dbs4.pdfusesText_8