CMPEN LAB

FLYMessi
Lab2.txt
Home>Computer Science homework help>CMPEN LAB
# CMPEN 331, Lab 2
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# switch to the Data segment
.data
# global data is defined here
# Don't forget the backslash-n (newline character)
Homework:
.asciiz CMPEN 331 Homework 2\n
Name_1:
.asciiz First Person's name\n
Name_2:
.asciiz Second Person's name\n
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# switch to the Text segment
.text
# the program is defined here
.globl main
main:
# Whose program is this?
la $a0, Homework
jal Print_string
la $a0, Name_1
jal Print_string
la $a0, Name_2
jal Print_string
# int i, j = 2, n = 3;
# for (i = 0; i <= 16; i++)
# {
# ... j = testcase[i]
# ... calculate n from j
# ... print i, j and n
# }
# register assignments
# $s0 i
# $s1 j = testcase[i]
# $s2 n
# $t0 address of testcase[i]
# $a0 argument to Print_integer, Print_string, etc.
# add to this list if you use any other registers
# initialization
li $s1, 2 # j = 2
li $s2, 3 # n = 3
# for (i = 0; i <= 16; i++)
li $s0, 0 # i = 0
la $t0, testcase # address of testcase[i]
bgt $s0, 16, bottom
top:
lw $s1, 0($t0) # j = testcase[i]
# calculate n from j
# Your part starts here
# Your part ends here
# print i, j and n
move $a0, $s0 # i
jal Print_integer
la $a0, sp # space
jal Print_string
move $a0, $s1 # j
jal Print_hex
la $a0, sp # space
jal Print_string
move $a0, $s2 # n
jal Print_hex
la $a0, sp # space
jal Print_string
move $a0, $s1 # j
jal Print_bin
la $a0, sp # space
jal Print_string
move $a0, $s2 # n
jal Print_bin
la $a0, nl # newline
jal Print_string
# for (i = 0; i <= 16; i++)
addi $s0, $s0, 1 # i++
addi $t0, $t0, 4 # address of testcase[i]
ble $s0, 16, top # i <= 16
bottom:
la $a0, done # mark the end of the program
jal Print_string
jal Exit0 # end the program, default return status
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
.data
# global data is defined here
sp:
.asciiz # space
nl:
.asciiz \n # newline
done:
.asciiz All done!\n
testcase:
# UTF-8 representation is one byte
.word 0x0000 # nul # Basic Latin, 0000 - 007F
.word 0x0024 # $ (dollar sign)
.word 0x007E # ~ (tilde)
.word 0x007F # del
# UTF-8 representation is two bytes
.word 0x0080 # pad # Latin-1 Supplement, 0080 - 00FF
.word 0x00A2 # cent sign
.word 0x0627 # Arabic letter alef
.word 0x07FF # unassigned
# UTF-8 representation is three bytes
.word 0x0800
.word 0x20AC # Euro sign
.word 0x2233 # anticlockwise contour integral sign
.word 0xFFFF
# UTF-8 representation is four bytes
.word 0x10000
.word 0x10348 # Hwair, see http://en.wikipedia.org/wiki/Hwair
.word 0x22E13 # randomly-chosen character
.word 0x10FFFF
.word 0x89ABCDEF # randomly chosen bogus value
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Wrapper functions around some of the system calls
# See P&H COD, Fig. A.9.1, for the complete list.
.text
.globl Print_integer
Print_integer: # print the integer in register $a0 (decimal)
li $v0, 1
syscall
jr $ra
.globl Print_string
Print_string: # print the string whose starting address is in register $a0
li $v0, 4
syscall
jr $ra
.globl Exit
Exit: # end the program, no explicit return status
li $v0, 10
syscall
jr $ra # this instruction is never executed
.globl Exit0
Exit0: # end the program, default return status
li $a0, 0 # return status 0
li $v0, 17
syscall
jr $ra # this instruction is never executed
.globl Exit2
Exit2: # end the program, with return status from register $a0
li $v0, 17
syscall
jr $ra # this instruction is never executed
# The following syscalls work on MARS, but not on QtSPIM
.globl Print_hex
Print_hex: # print the integer in register $a0 (hexadecimal)
li $v0, 34
syscall
jr $ra
.globl Print_bin
Print_bin: # print the integer in register $a0 (binary)
li $v0, 35
syscall
jr $ra
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -