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|
;;;;;;;;
;;; makes use of a designated function to add two numbers together
;;; uses a stack-based paradigm with a base pointer to manage argument passing
;;; TODO this file is incomplete due to remaining ISA subroutine design issues
.data
answer 0
.text
MAIN:
addi $5 $2 0x0 ; establish frame pointer
addi $6 $0 -11
push $6
jal SUB23
pop $6
store $6 answer($0)
SUB23:
push $5 ; push old frame pointer
addi $5 $2 0x0
subi $2 $2 0x4
addi $6 $0 -23
store $6 -4($5)
load $7 +4($5) ; access argument
load $6 -4($5)
add $6 $6 $7
push $6
jal ADD76
pop $6 ; retrieve and pass along
store $6 +4($5)
addi $2 $5 0x0 ; restore stack pointer
pop $5 ; restore frame pointer
ret
ADD76:
push $5
addi $5 $2 0x0
subi $2 $2 0x4
addi $6 $0 +76
store $6 -4($5)
load $7 +4($5) ; access argument
load $6 -4($5)
add $6 $6 $7
store $6 +4($5)
addi $2 $5 0x0
pop $5
ret
|
