Place a GETS subroutine where it says too. ; Main program to test the subroutine GETS ; This program simply prompts for two strings and ; displays them back using PUTS ; ------------------------------------------------------------------------- .ORIG x3000 ; Set up the user stack: LD R6, STKBASE ; Sets up the stack by loading the base address into R6 ; Prompt for the first string: LEA R0, PRMPT1 ; Loads the address of PRMPT1 into R0 PUTS ; Call GETS to get first string: LEA R0, STRNG1 ; Loads the address of STRNG1 ADD R6, R6, #-1 ; Push the address to store the string at STR R0, R6, #0 JSR GETS ; Call GETS ADD R6, R6, #2 ; Clean up (pop parameter & return value) ; Prompt for second string: LEA R0, PRMPT2 ; Loads the address of PRMPT2 PUTS ; Call GETS to get second string: LEA R0, STRNG2 ; Loads the address of STRNG2 ADD R6, R6, #-1 ; Push the second address to store the string at STR R0, R6, #0 JSR GETS ; Call GETS ADD R6, R6, #2 ; Clean up (pop parameter & return value) ; Output both strings: LEA R0, OUT1 ; First string... PUTS LEA R0, STRNG1 PUTS LD R0, LF ; Print a linefeed OUT ; Write character to console (TRAP x21) LEA R0, OUT2 ; Second string. PUTS LEA R0, STRNG2 PUTS HALT ; We are done ; GLOBAL VARIABLES ; ---------------- STKBASE .FILL xFDFF ; The bottom of the stack will be xFDFF LF .FILL x0A ; A linefeed character STRNG1 .BLKW #80 ; Room for 79 characters (unpacked) + NULL STRNG2 .BLKW #80 ; Room for 79 characters (unpacked) + NULL PRMPT1 .STRINGZ "Please enter the first string: " PRMPT2 .STRINGZ "Please enter the second string: " OUT1 .STRINGZ "The first string was: " OUT2 .STRINGZ "The second string was: " ; Professor's notes: ;===================================================================================== ; Place your GETS subroutine below the notes: ;===================================================================================== ; Subroutine GETS ; Paramters: Address - the address to store the string at ; ; Returns: Nothing ; ; Local variables ; Offset Description ; 0 Callee-saved register R0 ; -1 Callee-saved register R1 ; etc...

Place a GETS subroutine where it says too. ; Main program to test the subroutine GETS ; This program simply prompts for two strings and ; displays them back using PUTS ; ------------------------------------------------------------------------- .ORIG x3000 ; Set up the user stack: LD R6, STKBASE ; Sets up the stack by loading the base address into R6 ; Prompt for the first string: LEA R0, PRMPT1 ; Loads the address of PRMPT1 into R0 PUTS ; Call GETS to get first string: LEA R0, STRNG1 ; Loads the address of STRNG1 ADD R6, R6, #-1 ; Push the address to store the string at STR R0, R6, #0 JSR GETS ; Call GETS ADD R6, R6, #2 ; Clean up (pop parameter & return value) ; Prompt for second string: LEA R0, PRMPT2 ; Loads the address of PRMPT2 PUTS ; Call GETS to get second string: LEA R0, STRNG2 ; Loads the address of STRNG2 ADD R6, R6, #-1 ; Push the second address to store the string at STR R0, R6, #0 JSR GETS ; Call GETS ADD R6, R6, #2 ; Clean up (pop parameter & return value) ; Output both strings: LEA R0, OUT1 ; First string... PUTS LEA R0, STRNG1 PUTS LD R0, LF ; Print a linefeed OUT ; Write character to console (TRAP x21) LEA R0, OUT2 ; Second string. PUTS LEA R0, STRNG2 PUTS HALT ; We are done ; GLOBAL VARIABLES ; ---------------- STKBASE .FILL xFDFF ; The bottom of the stack will be xFDFF LF .FILL x0A ; A linefeed character STRNG1 .BLKW #80 ; Room for 79 characters (unpacked) + NULL STRNG2 .BLKW #80 ; Room for 79 characters (unpacked) + NULL PRMPT1 .STRINGZ "Please enter the first string: " PRMPT2 .STRINGZ "Please enter the second string: " OUT1 .STRINGZ "The first string was: " OUT2 .STRINGZ "The second string was: " ; Professor's notes: ;===================================================================================== ; Place your GETS subroutine below the notes: ;===================================================================================== ; Subroutine GETS ; Paramters: Address - the address to store the string at ; ; Returns: Nothing ; ; Local variables ; Offset Description ; 0 Callee-saved register R0 ; -1 Callee-saved register R1 ; etc...

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

Section: Chapter Questions

Problem 1PE

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Question

Place a GETS subroutine where it says too.

; Main program to test the subroutine GETS

; This program simply prompts for two strings and

; displays them back using PUTS

; -------------------------------------------------------------------------

.ORIG x3000

; Set up the user stack:

LD R6, STKBASE ; Sets up the stack by loading the base address into R6

; Prompt for the first string:

LEA R0, PRMPT1 ; Loads the address of PRMPT1 into R0

PUTS

; Call GETS to get first string:

LEA R0, STRNG1 ; Loads the address of STRNG1

ADD R6, R6, #-1 ; Push the address to store the string at

STR R0, R6, #0

JSR GETS ; Call GETS

ADD R6, R6, #2 ; Clean up (pop parameter & return value)

; Prompt for second string:

LEA R0, PRMPT2 ; Loads the address of PRMPT2

PUTS

; Call GETS to get second string:

LEA R0, STRNG2 ; Loads the address of STRNG2

ADD R6, R6, #-1 ; Push the second address to store the string at

STR R0, R6, #0

JSR GETS ; Call GETS

ADD R6, R6, #2 ; Clean up (pop parameter & return value)

; Output both strings:

LEA R0, OUT1 ; First string...

PUTS

LEA R0, STRNG1

PUTS

LD R0, LF ; Print a linefeed

OUT ; Write character to console (TRAP x21)

LEA R0, OUT2 ; Second string.

PUTS

LEA R0, STRNG2

PUTS

HALT ; We are done

; GLOBAL VARIABLES

; ----------------

STKBASE .FILL xFDFF ; The bottom of the stack will be xFDFF

LF .FILL x0A ; A linefeed character

STRNG1 .BLKW #80 ; Room for 79 characters (unpacked) + NULL

STRNG2 .BLKW #80 ; Room for 79 characters (unpacked) + NULL

PRMPT1 .STRINGZ "Please enter the first string: "

PRMPT2 .STRINGZ "Please enter the second string: "

OUT1 .STRINGZ "The first string was: "

OUT2 .STRINGZ "The second string was: "

; Professor's notes:

;=====================================================================================

; Place your GETS subroutine below the notes:

;=====================================================================================

; Subroutine GETS

; Paramters: Address - the address to store the string at

;

; Returns: Nothing

;

; Local variables

; Offset Description

; 0 Callee-saved register R0

; -1 Callee-saved register R1

; etc...

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