zoidberg@devbox:~/Code/ARM$ cat read.s
.global _start
_start:

 // open(filename, 0)
 MOV R7, #5
 LDR R0, =filename
 MOV R1, #0
 SWI #0



 // store returned file descriptor
 MOV R5, R0

 // Read from file descriptor read(fd, data, 10)
 MOV R7, #3
 MOV R0, R5
 MOV R2, #10
 LDR R1, =passwd
 SWI 0

 // close file descriptor close(fd)
 MOV R7, #6
 MOV R0, R5
 SWI 0

// write data from file to screen write(1, data, 10)
  MOV R7, #4
  MOV R0, #1
  MOV R2, #10
  LDR R1, =passwd
  SWI 0

// exit exit()
  MOV R7, #1
  SWI 0

  .data
filename:
  .ascii "/home/zoidberg/Code/ARM/test.txt"
passwd:
  .ascii "ZZZZZZZZZZZZZZZZZZ"

zoidberg@devbox:~/Code/ARM$

zoidberg@devbox:~/Code/ARM$ arm-linux-gnueabi-as read.s -o read.o
zoidberg@devbox:~/Code/ARM$ arm-linux-gnueabi-ld read.o -o read
zoidberg@devbox:~/Code/ARM$ qemu-arm ./read
ZZZZZZZZZZzoidberg@devbox:~/Code/ARM$ cat test.txt
testing
zoidberg@devbox:~/Code/ARM$