9.4: Stack Example
- Page ID
- 19914
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The following is an example program to use the stack to reverse a list of quadwords in place. Specifically, each value in a quadword array is placed on the stack in the first loop. In the second loop, each element is removed from the stack and placed back into the array (over-writing) the previous value.
; Simple example demonstrating basic stack operations.
; Reverse a list of numbers - in place.
; Method: Put each number on stack, then pop each number
; back off, and then put back into memory.
; *****************************************************
; Data declarations
section .data
; -----
; Define constants
EXIT_SUCCESS equ 0 ; successful operation
SYS_exit equ 60 ; call code for terminate
; -----
; Define Data.
numbers dq 121, 122, 123, 124, 125
len dq 5
; **************************************************** section .text
global _start
_start:
; Loop to put numbers on stack.
mov rcx, qword [len]
mov rbx, numbers
mov r12, 0
mov rax, 0
pushLoop:
push qword [rbx+r12*8]
inc r12
loop pushLoop
; -----
; All the numbers are on stack (in reverse order).
; Loop to get them back off.
; the original list...
mov rcx, qword [len]
mov rbx, numbers
mov r12, 0
popLoop:
pop rax
mov qword [rbx+r12*8], rax
inc r12
loop popLoop
; -----
; Done, terminate program.
last:
mov rax, SYS_exit ; call code for exit
mov rdi, EXIT_SUCCESS ; exit with success
syscall
There are other ways to accomplish this function (reversing a list), however this is meant to demonstrate the stack operations.