How to resolve the algorithm Create an object at a given address step by step in the ARM Assembly programming language

Published on 12 May 2024 09:40 PM
#Arm assembly

How to resolve the algorithm Create an object at a given address step by step in the ARM Assembly programming language

Table of Contents

Problem Statement

In systems programing it is sometimes required to place language objects at specific memory locations, like I/O registers, hardware interrupt vectors etc.

Show how language objects can be allocated at a specific machine addresses. Since most OSes prohibit access to the physical memory if it is not mapped by the application, as an example, rather than a physical address, take the address of some existing object (using suitable address operations if necessary).

For example:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Create an object at a given address step by step in the ARM Assembly programming language

Source code in the arm programming language

mov r0,#0x00100000
ldr r1,testData
str r1,[r0]   ;store 0x12345678 at address $100000
bx lr         ;return from subroutine

testData:
     .long 0x12345678    ;VASM uses .long for 32 bit and .word for 16 bit values, unlike most ARM assemblers.

.equ myVariable,0x00100000
mov r0,#myVariable
bl printLong        ;unimplemented printing routine

mov r0,#0x00100000
mov r1,#0
mvn r1,r1     ;flip the bits of r1
str r1,[r0]   ;store 0xFFFFFFFF at address $100000
bx lr         ;return from subroutine

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