.ORIG x3000 LEA R1, HELLO AGAIN LDR R2, R1, #0 BRz NEXT ADD R1, R1, #1 BR AGAIN

Question

                                  .ORIG    x3000
                                  LEA      R1, HELLO
                      AGAIN LDR      R2, R1, #0
                                  BRz      NEXT
                                  ADD     R1, R1, #1
                                  BR        AGAIN
                     NEXT    LEA      R0, PROMPT
                                  TRAP    x22                                        ; PUTS
                                   LD        R3, NEGENTER
                      AGAIN2            TRAP     x20                          ; GETC
                                  TRAP    x21                                         ; OUT
                                  ADD      R2, R0, R3
                                  BRz      CONT
                                  STR     R0, R1, #0
                                  ADD     R1, R1, #1
                                  BR       AGAIN2
                    CONT   ADD     R2, R2, #0
                                 STR      R2, R2, #0
                                 LEA       R0, HELLO
                                 TRAP     x22                                         ; PUTS
                                 TRAP     x25                                         ; HALT
                     NEGENTER .FILL         xFFF6                         ; -x0A
                     PROMPT           .STRINGZ “Please enter your name: “
                     HELLO.STRINGZ “Hello, “
                                 .BLKW #25
                                 .END
       1.) “Hello, World” Write, compile and execute an assembler program that take a store String that contains “Hello, World”

Explanation / Answer

section .text ;section declaration ;we must export the entry point to the ELF linker or global _start ;loader. They conventionally recognize _start as their ;entry point. Use ld -e foo to override the default. _start: ;write our string to stdout mov edx,len ;third argument: message length mov ecx,msg ;second argument: pointer to message to write mov ebx,1 ;first argument: file handle (stdout) mov eax,4 ;system call number (sys_write) int 0x80 ;call kernel ;and exit mov ebx,0 ;first syscall argument: exit code mov eax,1 ;system call number (sys_exit) int 0x80 ;call kernel section .data ;section declaration msg db "Hello, world!",0xa ;our dear string len equ $ - msg ;length of our dear string

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