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