sm64pc/tools/rasm2armips.py

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Python
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2020-06-02 18:44:34 +02:00
#!/usr/bin/env python
import argparse
import re
import sys
def read_file(filepath):
with open(filepath) as f:
lines = f.readlines()
split_lines = [re.split(r'[ ,]+', l.strip().replace('$', '')) for l in lines]
return split_lines
# jumps and branches with named targets
jumps = ['jal', 'j']
branches = ['beq', 'bgez', 'bgtz', 'blez', 'bltz', 'bne']
jump_branches = jumps + branches
# jumps and branches with delay slots
has_delay_slot = jump_branches + ['jr']
def decode_references(instructions):
refs = []
for ins in instructions:
if ins[3] in jump_branches:
target = int(ins[-1], 0)
if target not in refs:
refs.append(target)
return refs
def reassemble(args, instructions, refs):
print('.rsp')
print('\n.create DATA_FILE, 0x%04X' % 0x0000)
print('\n.close // DATA_FILE\n')
print('.create CODE_FILE, 0x%08X\n' % args.base)
delay_slot = False
for ins in instructions:
addr = int(ins[0], 0)
if (addr & 0xFFFF) in refs:
print('%s_%08x:' % (args.name, addr))
sys.stdout.write(' ' * args.indent)
if delay_slot:
sys.stdout.write(' ')
delay_slot = False
if ins[3] in jumps:
target = int(ins[-1], 0) | (args.base & 0xFFFF0000)
ins[-1] = '%s_%08x' % (args.name, target)
elif ins[3] in branches:
if ins[3][-1] =='z' and ins[5] == 'zero':
del ins[5] # remove 'zero' operand from branch
target = (int(ins[-1], 0) & 0x1FFF) + (args.base & 0xFFFF0000)
ins[-1] = '%s_%08x' % (args.name, target)
elif ins[3] == 'vsar': # fixup last operand of vsar
reg_map = {'ACC_H': 0, 'ACC_M': 1, 'ACC_L': 2}
reg = ins[4].split(r'[')[0]
num = reg_map[ins[-1]]
ins[-1] = '%s[%d]' % (reg, num)
if ins[3] in has_delay_slot:
delay_slot = True
if len(ins) > 4: # with args
print('%-5s %s' % (ins[3], ', '.join(ins[4:])))
else:
print('%s' % ins[3])
print('\n.close // CODE_FILE')
def main():
parser = argparse.ArgumentParser()
parser.add_argument('input_file', help="input assembly file generated from `rasm2 -D -e -a rsp -B -o 0x04001000 -f`")
parser.add_argument('-b', type=int, help="base address of file", dest='base', default=0x04001000)
parser.add_argument('-i', type=int, help="amount of indentation", dest='indent', default=4)
parser.add_argument('-n', help="name to prefex labels with", dest='name', default='f3d')
args = parser.parse_args()
lines = read_file(args.input_file)
refs = decode_references(lines)
reassemble(args, lines, refs)
main()