title: How to access command line args from _start in ARM Linux
body: <pre><code>@File: whichisthebiggest.s
      .global _start
  
  _start:
      LDR R2,=A                   @load numbers in A-C
      LDR R2, [R2]
      LDR R3,=B
      LDR R3, [R3]
      LDR R4,=C
      LDR R4, [R4]
  
      LDR R1, = message_A         @load message A
      CMP R2, R3                  @compare A and B
      BLE who_is_the_biggest      @if B is greater, go to function
      MOV R3, R4                  @make C the new B
      CMP R2, R3                  @compare B and C
      BLE who_is_the_biggest_2    @if C is bigger, go to function
      B exit                      @end it, were done
  
  who_is_the_biggest:             
      MOV R2, R3                  @since b is bigger, make B the new A
      LDR R1, =message_B          @change the message to B, since A isnt bigger
  
  who_is_the_biggest_2:
      MOV R2, R3                  @put C in the number one spot. R2 is the answer
      LDR R1, =message_C          @change to message C since it is bigger than B
  
  exit:
      MOV R0, #1                  @necessary to bring string
      SWI 0x69                    @prints string
      SWI 0x11                    @stop running program
  
  .data
  A:  .word 34                    @declare variables, numbers
  B:  .word 10
  C:  .word 54
  message_A:  .asciz "A &gt; B and A &gt; C"    @declare strings
  message_B:  .asciz "B &gt; C and B &gt; A"
  message_C:  .asciz "C &gt; A and C &gt; B"
  </code></pre>
  
  <p>I am working on arm assembly raspberry Pi, I want to know how can I instead of message_A AND MESSAGE_B be in the code..I read them from command line argument when run by the user.
  and give a message in case two arguments not given.</p>