Course Content

ARM assembler simulator

system call table per arch

Assemble assembly source file into object file

as -o program.o program.s

Assemble assembly source file into object file with debugging info

as -g -o program.o program.s

Link assemble object file into executable

ld -o program program.o

The proper way to finish a program is by calling sys_exit. System calls are called "Software Interrupt" command
The following code is an example of using exit system call:

	.global _start

_start:

	MOV R0,#5     ; Set the parameter for sys_exit
	
	MOV R7,#1
	SWI 0         ; Call sys_exit

You can observe the exit code of the last exited command by running:

echo $?

.req - Alias for register.
       foo .req R0

.equ - Define a constant.
      .equ BYTES_TO_ALLOCATE, 16

Stack pointer and Frame pointer