어셈블리어 - Linux

.section .data

.equ SYS_OPEN, 5

.equ SYS_WRITE, 4

.equ SYS_READ, 3 

.equ SYS_CLOSE, 6

.equ SYS_EXIT, 1

.equ O_RDONLY, 0

.equ O_CREAT_WRONLY_TRUNC, 03101

.equ STDIN, 0

.equ STDOUT, 1

.equ STDERR, 2

.equ LINUX_SYSCALL, 0x80

.equ END_OF_FILE, 0

.section .bss

.equ BUFFER_SIZE, 500

.lcomm BUFFER_DATA, BUFFER_SIZE

.section .text

.equ ST_SIZE_RESERVE, 8

.equ ST_FD_IN, -4 # input file descriptor

.equ ST_FD_OUT, -8 # output file descriptor

.equ ST_ARGC, 0 #Number of arguments ; argc

.equ ST_ARGV_0, 4 #Name of program ; argv[0]

.equ ST_ARGV_1, 8 #Input file name ; argv[1]

.equ ST_ARGV_2, 12 #Output file name ; argv[2]

.globl _start

_start:

movl %esp, %ebp

subl $ST_SIZE_RESERVE, %esp

#open_files:

#open_fd_in:

movl $SYS_OPEN, %eax

movl ST_ARGV_1(%ebp), %ebx

movl $O_RDONLY, %ecx

movl $0666, %edx

int $LINUX_SYSCALL

#store_fd_in:

movl %eax, ST_FD_IN(%ebp)

#open_fd_out:

movl $SYS_OPEN, %eax

movl ST_ARGV_2(%ebp), %ebx

movl $O_CREAT_WRONLY_TRUNC, %ecx

movl $0666, %edx

int $LINUX_SYSCALL

#store_fd_out:

movl %eax, ST_FD_OUT(%ebp)

read_loop_begin:

movl $SYS_READ, %eax

movl ST_FD_IN(%ebp), %ebx

movl $BUFFER_DATA, %ecx

movl $BUFFER_SIZE, %edx

int $LINUX_SYSCALL

cmpl $END_OF_FILE, %eax

jle end_loop

#continue_read_loop:

pushl $BUFFER_DATA

pushl %eax

call convert_to_upper

popl %eax

addl $4, %esp

#addl $8, %esp

movl %eax, %edx

movl $SYS_WRITE, %eax

movl ST_FD_OUT(%ebp), %ebx

movl $BUFFER_DATA, %ecx

#movl $BUFFER_SIZE, %edx

int $LINUX_SYSCALL

jmp read_loop_begin

end_loop:

movl $SYS_CLOSE, %eax

movl ST_FD_OUT(%ebp), %ebx

int $LINUX_SYSCALL

movl $SYS_CLOSE, %eax

movl ST_FD_IN(%ebp), %ebx

int $LINUX_SYSCALL

movl $SYS_EXIT, %eax

movl $0, %ebx

int $LINUX_SYSCALL

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http://www.joinc.co.kr/modules/moniwiki/wiki.php/Site/Assembly/Documents/ProgrammingGroundUp/index.html