/** FILE : HELLO.C*/

#include <stdio.h>

int main(){printf(“Hello! \n”);return 0;

}

Hello.bin

Memory

HDD

Hello.bin

Memory

Hello.bin

Flash Compile

HW Programming

Execute

PC (Computer)Target Board

# include <stdio.h>

int main(void){

printf(“Hello\n”);

return 0;}

a.out (Executable ELF)gcc (GNU C Compiler)

hello.o (Relocatable ELF)

hello.c (C Source Code)

컴파일

링킹

# 처리

C 문법 검사

라이브러리 호출 루틴 추가

CPU, 메모리 등 정보 추가

Application

(System) Library

System Call

Virtual File System

Device File System

Character Device Driver

General File System Network File System

Buffer Cache

Block Device Driver

TCP/IP Protocol Stack

Network Device Driver

Device Interface

Block Device Character Device Network Device

User Level

Kernel Level

System Call Hacking

Software Interrupt

int main(){

………

open();

………}

fd = open();

sd = socket();

Application

open(){

………

swi 0x900005;

………}

(System) Library

Interrupt Vector (1)

Interrupt Vector (2)

Interrupt Vector (3)

Interrupt Vector (4)

Interrupt Vector (5)

………sys_open()

Software Interrupt System Call

Interrupt Vector Table

User Level Kernel Level

source1.S

source2.c

source3.c

source(n).c

...

vmlinux piggy.o

piggy.gz

unzip code

ELF BIN zImage

Firmware, RTOS System Non-RTOS System

Firmware User App. Firmware

User Application

OS (Kernel)

Hardware (Device)Hardware (Device)

VMware

Ubuntu LTS version : 10.04

AutomaticLogin=root : /etc/gdm/custom.conf

Some Packages update

Server Configuration : Samba, Telnet

PC (Computer) Target Board

Parallel, USB : Programming, JTAG

Serial : Monitoring

Ethernet, USB : Downloading