Raspberry Pi Assembly Language Programming by Stephen Smith

Author:Stephen Smith
Language: eng
Format: epub, pdf
ISBN: 9781484252871
Publisher: Apress

Adding with Carry Revisited

In Chapter 2, “Loading and Adding,” we gave sample code to add two 64-bit numbers using ADDS and ADC instructions. What was lacking from this example was some way to see the output. Now we’ll take addexamp2.s and add some calls to our debug macros, in Listing 9-2, to show it in action.@

@ Example of 64-bit addition with the ADD/ADC

@ instructions.

@

.include "debug.s"

.global main @ Provide program starting

@ main routine to be called by C runtime

main:

push {R4-R12, LR}

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