From 76c749d41a22333440258131ff6ac2a72ae5c6c6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicol=C3=A1s=20A=2E=20Ortega?= Date: Tue, 24 May 2016 18:49:59 +0200 Subject: [PATCH] Added source file. --- MaxValue.asm | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 MaxValue.asm diff --git a/MaxValue.asm b/MaxValue.asm new file mode 100644 index 0000000..db16c6d --- /dev/null +++ b/MaxValue.asm @@ -0,0 +1,43 @@ +#PURPOSE: This program finds the maximum number of a set of data items. +# + +#VARIABLES: The registers have the following uses: +# +# %edi - Holds the index of the data item being examined +# %ebx - Largest data item found +# %eax - Current data item +# +# The following memory locations are used: +# +# data_items - contains the item data. A 0 is used to terminate the data +# + +.section .data +data_items: + .long 3,67,34,222,45,75,54,34,44,33,22,11,66,0 + +.section .text +.globl _start + +_start: + movl $0, %edi # move 0 into the index register + movl data_items(,%edi,4), %eax # load the first byte of data + movl %eax, %ebx # since this is the first item it + # is the biggest (duh) + + start_loop: # start the loop + cmpl $0, %eax # check to see if end value 0 + je loop_exit + incl %edi # increase index + movl data_items(,%edi,4),%eax # load the next byte of data + cmpl %ebx, %eax # compare values + jle start_loop # jump to the loop beginning if the + # new value isn't bigger + movl %eax, %ebx # move the value as the largest + jmp start_loop # jump to loop beginning + + loop_exit: + # since %ebx is already the set as the largest value in the data + # simply return it in the exit system call since it's already %ebx + movl $1, %eax # 1 tell the kernel to exit + int $0x80