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Foundations of Linux ARM64: Debug, Disassemble, and Reverse

Incrementing Numbers Using Pointers

Explore how to increment numbers stored at memory addresses using pointers in C/C++ and ARM64 assembly. Understand corresponding GDB disassembly output and instruction execution to trace how memory and registers are updated step-by-step.

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Increment numbers in different environments

In the pseudocode, we can use pointers to increment a number stored at the memory location with the address stored in x0:

[x0] <- [x0] + 1

In the C/C++ language

In C or C++, we can write incrementing numbers using pointers in three possible ways:

C++
*a = *a + 1;  // method 1
++(*a);       // method 2
(*a)++;       // method 3

In the assembly language

In the assembly language, we use instructions ldr ...