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# Ali Tavassoly
# 98108395
.macro input_integer # macro for input integer
addi $v0, $zero, 5
syscall
.end_macro
.macro output_enter # macro for enter output
addi $v0, $zero, 11
addi $a0, $zero, 10
syscall
.end_macro
.macro output_space # macro for space output
addi $a0, $zero, 32
addi $v0, $zero, 11
syscall
.end_macro
.macro input_string # macro for string input
la $a0, file_name
add $a1, $zero, 1024
addi $v0, $zero, 8
syscall
.end_macro
.macro open_file (%flag) # macro for openning file
la $a0, file_name
addi $a1, $zero, %flag
addi $v0, $zero, 13
syscall
.end_macro
.macro close_file
addi $v0, $zero, 16
add $a0, $zero, $t2 # file descriptor
syscall # close file
.end_macro
.text
main:
la $a0, stack_size_message
addi $v0, $zero, 4
syscall # Input size of stack
input_integer
add $s7, $zero, $v0 # size of stack
add $a0, $zero, $v0 # size of stack
mul $a0, $a0, 4 # number of bytes that is needed
add $t0, $zero, $a0
addi $t0, $t0, 4 # number of bytes for alternative stack
addi $v0, $zero, 9
syscall # allocating memory
add $s6, $zero, $v0 # address of alternative memory
addi $v0, $zero, 9
add $a0, $zero, $t0
syscall # allocating memory for alternative stack
add $s0, $zero, $v0 # address of allocated memory
add $s1, $zero, $v0 # pointer to the top of the stack
for:
la $a0, input_message
addi $v0, $zero, 4
syscall # print input message
input_integer
add $t0, $zero, $v0 # input a number
beq $t0, 0, zero
beq $t0, 1, one
beq $t0, 2, two
beq $t0, 3, three
beq $t0, 4, four
beq $t0, 5, five
beq $t0, 6, six
beq $t0, 7, seven
la $a0, outrange_error
addi $v0, $zero, 4
syscall # if the number is outranged
j for
zero:
j end_for
one:
sub $t3, $s1, $s0
div $t3, $t3, 4
beq $t3, $s7, StackOverFlow_error
input_integer # input a number to push
add $a0, $zero, $v0
jal push # push the number
j for
two:
beq $s0, $s1, StackOverFlow_error
jal pop # pop
add $a0, $zero, $v0
addi $v0, $zero, 1
syscall # print the popped number
output_enter # print enter
j for
three:
add $t0, $zero, $s0
while:
beq $t0, $s1, end_while # end while condition
lw $a0, ($t0)
addi $v0, $zero, 1
syscall # print the i-th number
output_space
addi $t0, $t0, 4 # next iterate
j while
end_while:
output_enter
j for
four:
sub $t3, $s1, $s0
div $t3, $t3, 4
ble $t3, 1, NotEnoughElements_error
jal pop
add $t0, $zero, $v0 # first element
jal pop
add $t1, $zero, $v0 # second element
add $a0, $t0, $t1
jal push
j for
five:
sub $t3, $s1, $s0
div $t3, $t3, 4
ble $t3, 1, NotEnoughElements_error
jal pop
add $t0, $zero, $v0 # first element
jal pop
add $t1, $zero, $v0 # second element
mul $a0, $t0, $t1
jal push
j for
six:
input_string
open_file(1)
add $t2, $zero, $v0 # file descriptor
add $a1, $zero, $s0
sub $a2, $s1, $s0 # number of bytes to be written
add $a0, $zero, $t2 # file descriptor
addi $v0, $zero, 15
syscall # write file
close_file
j for
seven:
input_string
open_file(0)
add $t2, $zero, $v0 # file descriptor
blt $v0, 0, FileNotFound_error # if the file does not exit!
mul $t5, $s7, 4
addi $t5, $t5, 4 # size of current stack + 1
add $a1, $zero, $s6
add $a2, $zero, $t5 # read size + 1 of stack
add $a0, $zero, $t2 # file descriptor
addi $v0, $zero, 14
syscall # read file
add $t5, $zero, $v0
close_file
bne $t5, $s7, SizeNotMatch_error
open_file(0)
add $t2, $zero, $v0 # file descriptor
add $a1, $zero, $s0
addi $a2, $zero, 2048
add $a0, $zero, $t2 # file descriptor
addi $v0, $zero, 14
syscall # read file
add $s1, $s0, $v0 # update top of stack
close_file
j for
end_for:
j main_return
StackOverFlow_error:
la $a0, StackOverFlow_error_message
addi $v0, $zero, 4
syscall # if the stack is full
j for
StackEmpty_error:
la $a0, StackEmpty_error_message
addi $v0, $zero, 4
syscall # if the stack is empty
j for
NotEnoughElements_error:
la $a0, NotEnoughElements_error_message
addi $v0, $zero, 4
syscall # if there isn't enough elements
j for
FileNotFound_error:
la $a0, FileNotFound_error_message
addi $v0, $zero, 4
syscall # if the file doesn't exit
j for
SizeNotMatch_error:
la $a0, SizeNotMatch_error_message
addi $v0, $zero, 4
syscall # if size of stack in the file does not match to the current size
j for
main_return:
addi $v0, $zero, 10
syscall
push:
sw $a0, ($s1)
addi $s1, $s1, 4
jr $ra
pop:
addi $s1, $s1, -4
lw $v0, ($s1)
jr $ra
.data
jump_table: .space 36
input_message: .asciiz "Enter a number between 0 to 7:\n"
stack_size_message: .asciiz "Enter size of the stack:\n"
outrange_error: .asciiz "Please input a number between 0 to 7 \n"
StackOverFlow_error_message: .asciiz "Stack is already full!\n"
StackEmpty_error_message: .asciiz "Stack is empty! \n"
NotEnoughElements_error_message: .asciiz "For summation and multipication, there should be at least 2 elements! \n"
FileNotFound_error_message : .asciiz "The file you have entered, doesn't exit! \n"
SizeNotMatch_error_message : .asciiz "Size of stacks does not match! \n"
file_name: .asciiz