Generate Nios II assembly to save registers to stack

gen_save_reg_to_stack.py

STORE_MEM_INST = 'stw'
REGISTER_PREFIX = 'r'
STACK_POINTER_REG = 'sp'
RETURN_POINTER_REG = 'ra'
WORD_SIZE = 4

from_reg = int(input("from register: "))
to_reg = int(input("to register: "))

output = []
cur_offset = 0
output.append(f'subi {STACK_POINTER_REG}, {STACK_POINTER_REG}, {WORD_SIZE * (to_reg - from_reg + 2)}')
output.append(f'stw {RETURN_POINTER_REG}, {cur_offset}({STACK_POINTER_REG})')
cur_offset += WORD_SIZE
for reg in range(from_reg, to_reg + 1):
    output.append(f'stw {REGISTER_PREFIX}{reg}, {cur_offset}({STACK_POINTER_REG})')
    cur_offset += WORD_SIZE

output.append('\n# CODE HERE\n')

cur_offset = 0
output.append(f'ldw {RETURN_POINTER_REG}, {cur_offset}({STACK_POINTER_REG})')
cur_offset += WORD_SIZE
for reg in range(from_reg, to_reg + 1):
    output.append(f'ldw {REGISTER_PREFIX}{reg}, {cur_offset}({STACK_POINTER_REG})')
    cur_offset += WORD_SIZE
output.append(f'addi {STACK_POINTER_REG}, {STACK_POINTER_REG}, {WORD_SIZE * (to_reg - from_reg + 2)}')

print('-' * 20)
for line in output:
    print(line)

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