165 lines
3.1 KiB
NASM
165 lines
3.1 KiB
NASM
# All program code is placed after the
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# .text assembler directive
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.text
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# Declare main as a global function
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.globl main
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j main
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# code for add
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add:
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# Entering a new scope.
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# Symbols in symbol table:
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# println
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# x
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# y
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# return
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# Update the stack pointer.
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addi $sp $sp -0
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# Get x's offset from $sp from the symbol table and initialize x's address with it. We'll add $sp later.
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li $t1 -4
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# Add the stack pointer address to the offset.
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add $t1 $t1 $sp
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# Load the value of x.
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lw $t0 0($t1)
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# Get y's offset from $sp from the symbol table and initialize y's address with it. We'll add $sp later.
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li $t2 -8
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# Add the stack pointer address to the offset.
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add $t2 $t2 $sp
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# Load the value of y.
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lw $t1 0($t2)
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add $t0 $t0 $t1
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sw $t0 -12($sp)
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jr $ra
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# Exiting scope.
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addi $sp $sp 0
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jr $ra
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# code for add2
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add2:
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# Entering a new scope.
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# Symbols in symbol table:
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# println
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# x
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# y
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# return
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# Update the stack pointer.
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addi $sp $sp -0
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# Calling function add
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# Save $ra to a register
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move $t0 $ra
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# Save $t0-9 registers
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sw $t0 -16($sp)
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# Evaluate parameters and save to stack
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# Calling function add
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# Save $ra to a register
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move $t1 $ra
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# Save $t0-9 registers
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sw $t0 -16($sp)
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sw $t1 -20($sp)
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# Evaluate parameters and save to stack
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# Get x's offset from $sp from the symbol table and initialize x's address with it. We'll add $sp later.
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li $t3 -4
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# Add the stack pointer address to the offset.
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add $t3 $t3 $sp
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# Load the value of x.
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lw $t2 0($t3)
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sw $t2 -24($sp)
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# Get y's offset from $sp from the symbol table and initialize y's address with it. We'll add $sp later.
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li $t3 -8
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# Add the stack pointer address to the offset.
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add $t3 $t3 $sp
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# Load the value of y.
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lw $t2 0($t3)
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sw $t2 -28($sp)
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# Update the stack pointer
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add $sp $sp -20
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# Call the function
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jal add
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# Restore the stack pointer
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add $sp $sp 20
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# Restore $t0-9 registers
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lw $t0 -16($sp)
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lw $t1 -20($sp)
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# Restore $ra
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move $ra $t1
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# Get return value off stack
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lw $t1 -32($sp)
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sw $t1 -20($sp)
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li $t1 1
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sw $t1 -24($sp)
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# Update the stack pointer
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add $sp $sp -16
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# Call the function
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jal add
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# Restore the stack pointer
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add $sp $sp 16
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# Restore $t0-9 registers
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lw $t0 -16($sp)
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# Restore $ra
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move $ra $t0
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# Get return value off stack
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lw $t0 -28($sp)
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sw $t0 -12($sp)
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jr $ra
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# Exiting scope.
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addi $sp $sp 0
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jr $ra
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# code for main
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main:
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# Entering a new scope.
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# Symbols in symbol table:
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# println
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# return
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# Update the stack pointer.
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addi $sp $sp -0
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# println
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la $a0 datalabel0
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li $v0 4
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syscall
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la $a0 newline
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li $v0 4
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syscall
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# println
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# Calling function add2
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# Save $ra to a register
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move $t0 $ra
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# Save $t0-9 registers
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sw $t0 -4($sp)
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# Evaluate parameters and save to stack
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li $t1 2
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sw $t1 -8($sp)
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li $t1 4
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sw $t1 -12($sp)
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# Update the stack pointer
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add $sp $sp -4
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# Call the function
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jal add2
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# Restore the stack pointer
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add $sp $sp 4
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# Restore $t0-9 registers
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lw $t0 -4($sp)
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# Restore $ra
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move $ra $t0
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# Get return value off stack
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lw $t0 -16($sp)
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move $a0 $t0
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li $v0 1
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syscall
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la $a0 newline
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li $v0 4
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syscall
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# Exiting scope.
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addi $sp $sp 0
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li $v0 10
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syscall
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# All memory structures are placed after the
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# .data assembler directive
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.data
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newline: .asciiz "\n"
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datalabel0: .asciiz "This program prints 7"
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