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how to pass a list to a function without using move in mips

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0

i want to pass a list to function in mips so that i can do soemthing to that lsit, but my assignment prohibit the move instruction,

tried to pass the address, but they all error

addi $fp, $sp, 0
addi $sp, $sp, -4

la $t0, thelist
sw $t0, ($sp)
jal bubblesort

bubblesort: 
 #call function
 addi $sp, $sp, -8 #push 8 bytes to store $fp and $ra
 sw $ra, 4($sp)
 sw $fp, ($sp)

 #copy $sp to $fp
 addi $fp, $sp, 0

 #allocate local variable
 addi $sp, $sp, -16 #i, j, listaddress, size

 #initialize i j n
 lw $t0, 8($fp)
 sw $t0, -12($fp) # listaddress
 lw $t1, size 
 sw $0, -8($fp) #i = 0
 sw $0, -4($fp) #j = 0

 loop1:
 #condition
 lw $t0, -8($fp) #load i
 lw $t1, size #the actual n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, end #if i == n-1, jump to end

 loop2:
 lw $t0, -4($fp) #load j
 lw $t1, size #load n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, exit1 #if j == n-1, jump to exit1

 #swap section
 lw $t1, thelist #$t1 = list address 
 sll $t0, $t0, 2 #j = j*4 
 add $t3, $t1, $t0 #address of list[j]
 lw $t4, ($t3) #list[j]
 lw $t5, 4($t3) #list[j+1]
 slt $t2, $t5, $t4 
 beq $t2, $0, exit2 #if list[j] < list[j+1], jump to loop2
 #swap
 add $t2, $t5, 0 #temp = list[j+1]
 add $t5, $t4, 0 #list[j+1] = list[j]
 add $t4, $t2, 0 #list[j] = temp

 sw $t5, ($t3)
 sw $t6, 4($t3)

 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit2:
 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit1: 
 lw $t0, -8($fp)
 addi $t0, $t0, 1
 sw $t0, -8($fp)
 j loop1 
 end:
 lw $v0, -12($fp)
 addi $sp, $sp 12
 lw $fp, ($sp)
 lw $ra, 4($sp)
 addi $sp, $sp, 8
 jr $ra

mips32

share|improve this question

edited Mar 27 at 6:06

Stefan Becker

4,59133 gold badges1111 silver badges2525 bronze badges

asked Mar 27 at 5:26

LeslieLeslie

1

add a comment | 

0

i want to pass a list to function in mips so that i can do soemthing to that lsit, but my assignment prohibit the move instruction,

tried to pass the address, but they all error

addi $fp, $sp, 0
addi $sp, $sp, -4

la $t0, thelist
sw $t0, ($sp)
jal bubblesort

bubblesort: 
 #call function
 addi $sp, $sp, -8 #push 8 bytes to store $fp and $ra
 sw $ra, 4($sp)
 sw $fp, ($sp)

 #copy $sp to $fp
 addi $fp, $sp, 0

 #allocate local variable
 addi $sp, $sp, -16 #i, j, listaddress, size

 #initialize i j n
 lw $t0, 8($fp)
 sw $t0, -12($fp) # listaddress
 lw $t1, size 
 sw $0, -8($fp) #i = 0
 sw $0, -4($fp) #j = 0

 loop1:
 #condition
 lw $t0, -8($fp) #load i
 lw $t1, size #the actual n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, end #if i == n-1, jump to end

 loop2:
 lw $t0, -4($fp) #load j
 lw $t1, size #load n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, exit1 #if j == n-1, jump to exit1

 #swap section
 lw $t1, thelist #$t1 = list address 
 sll $t0, $t0, 2 #j = j*4 
 add $t3, $t1, $t0 #address of list[j]
 lw $t4, ($t3) #list[j]
 lw $t5, 4($t3) #list[j+1]
 slt $t2, $t5, $t4 
 beq $t2, $0, exit2 #if list[j] < list[j+1], jump to loop2
 #swap
 add $t2, $t5, 0 #temp = list[j+1]
 add $t5, $t4, 0 #list[j+1] = list[j]
 add $t4, $t2, 0 #list[j] = temp

 sw $t5, ($t3)
 sw $t6, 4($t3)

 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit2:
 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit1: 
 lw $t0, -8($fp)
 addi $t0, $t0, 1
 sw $t0, -8($fp)
 j loop1 
 end:
 lw $v0, -12($fp)
 addi $sp, $sp 12
 lw $fp, ($sp)
 lw $ra, 4($sp)
 addi $sp, $sp, 8
 jr $ra

mips32

share|improve this question

edited Mar 27 at 6:06

Stefan Becker

4,59133 gold badges1111 silver badges2525 bronze badges

asked Mar 27 at 5:26

LeslieLeslie

1

add a comment | 

i want to pass a list to function in mips so that i can do soemthing to that lsit, but my assignment prohibit the move instruction,

tried to pass the address, but they all error

addi $fp, $sp, 0
addi $sp, $sp, -4

la $t0, thelist
sw $t0, ($sp)
jal bubblesort

bubblesort: 
 #call function
 addi $sp, $sp, -8 #push 8 bytes to store $fp and $ra
 sw $ra, 4($sp)
 sw $fp, ($sp)

 #copy $sp to $fp
 addi $fp, $sp, 0

 #allocate local variable
 addi $sp, $sp, -16 #i, j, listaddress, size

 #initialize i j n
 lw $t0, 8($fp)
 sw $t0, -12($fp) # listaddress
 lw $t1, size 
 sw $0, -8($fp) #i = 0
 sw $0, -4($fp) #j = 0

 loop1:
 #condition
 lw $t0, -8($fp) #load i
 lw $t1, size #the actual n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, end #if i == n-1, jump to end

 loop2:
 lw $t0, -4($fp) #load j
 lw $t1, size #load n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, exit1 #if j == n-1, jump to exit1

 #swap section
 lw $t1, thelist #$t1 = list address 
 sll $t0, $t0, 2 #j = j*4 
 add $t3, $t1, $t0 #address of list[j]
 lw $t4, ($t3) #list[j]
 lw $t5, 4($t3) #list[j+1]
 slt $t2, $t5, $t4 
 beq $t2, $0, exit2 #if list[j] < list[j+1], jump to loop2
 #swap
 add $t2, $t5, 0 #temp = list[j+1]
 add $t5, $t4, 0 #list[j+1] = list[j]
 add $t4, $t2, 0 #list[j] = temp

 sw $t5, ($t3)
 sw $t6, 4($t3)

 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit2:
 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit1: 
 lw $t0, -8($fp)
 addi $t0, $t0, 1
 sw $t0, -8($fp)
 j loop1 
 end:
 lw $v0, -12($fp)
 addi $sp, $sp 12
 lw $fp, ($sp)
 lw $ra, 4($sp)
 addi $sp, $sp, 8
 jr $ra

mips32

share|improve this question

edited Mar 27 at 6:06

Stefan Becker

4,59133 gold badges1111 silver badges2525 bronze badges

asked Mar 27 at 5:26

LeslieLeslie

1

addi $fp, $sp, 0
addi $sp, $sp, -4

la $t0, thelist
sw $t0, ($sp)
jal bubblesort

bubblesort: 
 #call function
 addi $sp, $sp, -8 #push 8 bytes to store $fp and $ra
 sw $ra, 4($sp)
 sw $fp, ($sp)

 #copy $sp to $fp
 addi $fp, $sp, 0

 #allocate local variable
 addi $sp, $sp, -16 #i, j, listaddress, size

 #initialize i j n
 lw $t0, 8($fp)
 sw $t0, -12($fp) # listaddress
 lw $t1, size 
 sw $0, -8($fp) #i = 0
 sw $0, -4($fp) #j = 0

 loop1:
 #condition
 lw $t0, -8($fp) #load i
 lw $t1, size #the actual n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, end #if i == n-1, jump to end

 loop2:
 lw $t0, -4($fp) #load j
 lw $t1, size #load n
 addi $t1, $t1, -1 #n = n - 1
 beq $t0, $t1, exit1 #if j == n-1, jump to exit1

 #swap section
 lw $t1, thelist #$t1 = list address 
 sll $t0, $t0, 2 #j = j*4 
 add $t3, $t1, $t0 #address of list[j]
 lw $t4, ($t3) #list[j]
 lw $t5, 4($t3) #list[j+1]
 slt $t2, $t5, $t4 
 beq $t2, $0, exit2 #if list[j] < list[j+1], jump to loop2
 #swap
 add $t2, $t5, 0 #temp = list[j+1]
 add $t5, $t4, 0 #list[j+1] = list[j]
 add $t4, $t2, 0 #list[j] = temp

 sw $t5, ($t3)
 sw $t6, 4($t3)

 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit2:
 lw $t0, -4($fp)
 addi $t0, $t0, 1 #j = j+1
 sw $t0, -4($fp)
 j loop2

 exit1: 
 lw $t0, -8($fp)
 addi $t0, $t0, 1
 sw $t0, -8($fp)
 j loop1 
 end:
 lw $v0, -12($fp)
 addi $sp, $sp 12
 lw $fp, ($sp)
 lw $ra, 4($sp)
 addi $sp, $sp, 8
 jr $ra

share|improve this question

edited Mar 27 at 6:06

Stefan Becker

4,59133 gold badges1111 silver badges2525 bronze badges

asked Mar 27 at 5:26

LeslieLeslie

1

share|improve this question

edited Mar 27 at 6:06

Stefan Becker

4,59133 gold badges1111 silver badges2525 bronze badges

asked Mar 27 at 5:26

LeslieLeslie

1

edited Mar 27 at 6:06

Stefan Becker

4,59133 gold badges1111 silver badges2525 bronze badges

edited Mar 27 at 6:06

Stefan Becker

4,59133 gold badges1111 silver badges2525 bronze badges

asked Mar 27 at 5:26

LeslieLeslie

1

asked Mar 27 at 5:26

LeslieLeslie

1

1 Answer
1

active

oldest

votes

0

You actually can access $t registers inside your functions. There is no need to store it on the stack before. If you load your list to $t10 for example, you can easily access it inside of your function. Also: Instead of move, you can always use add. I can't run your code, since it is not a complete example. How is your list stored?

share|improve this answer

edited Mar 28 at 21:40

answered Mar 28 at 21:35

KruspeKruspe

2688 bronze badges

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0

You actually can access $t registers inside your functions. There is no need to store it on the stack before. If you load your list to $t10 for example, you can easily access it inside of your function. Also: Instead of move, you can always use add. I can't run your code, since it is not a complete example. How is your list stored?

share|improve this answer

edited Mar 28 at 21:40

answered Mar 28 at 21:35

KruspeKruspe

2688 bronze badges

add a comment | 

0

You actually can access $t registers inside your functions. There is no need to store it on the stack before. If you load your list to $t10 for example, you can easily access it inside of your function. Also: Instead of move, you can always use add. I can't run your code, since it is not a complete example. How is your list stored?

share|improve this answer

edited Mar 28 at 21:40

answered Mar 28 at 21:35

KruspeKruspe

2688 bronze badges

add a comment | 

You actually can access $t registers inside your functions. There is no need to store it on the stack before. If you load your list to $t10 for example, you can easily access it inside of your function. Also: Instead of move, you can always use add. I can't run your code, since it is not a complete example. How is your list stored?

share|improve this answer

edited Mar 28 at 21:40

answered Mar 28 at 21:35

KruspeKruspe

2688 bronze badges

share|improve this answer

edited Mar 28 at 21:40

answered Mar 28 at 21:35

KruspeKruspe

2688 bronze badges

answered Mar 28 at 21:35

KruspeKruspe

2688 bronze badges

answered Mar 28 at 21:35

KruspeKruspe

2688 bronze badges