Write a subroutine to copy the content of register R0 and R1 into the register R20 and R21 respectively. Initialize the Stack pointer to the last location of the RAM and preserve the content of the register R20 and R21 using the stack during the subroutine call. Illustrate the content of the stack and the stack pointer during the subroutine execution.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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(c)
Write a subroutine to copy the content of register R0 and R1 into the
register R20 and R21 respectively. Initialize the Stack pointer to the last
location of the RAM and preserve the content of the register R20 and R21
using the stack during the subroutine call. Illustrate the content of the stack
and the stack pointer during the subroutine execution.
Transcribed Image Text:(c) Write a subroutine to copy the content of register R0 and R1 into the register R20 and R21 respectively. Initialize the Stack pointer to the last location of the RAM and preserve the content of the register R20 and R21 using the stack during the subroutine call. Illustrate the content of the stack and the stack pointer during the subroutine execution.
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