113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
#!/usr/bin/env python3
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#
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# Cross Platform and Multi Architecture Advanced Binary Emulation Framework
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#
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import sys, traceback
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from .loader import QlLoader
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from qiling import Qiling
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from qiling.os.disk import QlDisk
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# @see: http://pinvoke.net/default.aspx/Structures.IMAGE_DOS_HEADER
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class ComParser:
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'''Most basic COM file parser.
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'''
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def __init__(self, ql: Qiling, data: bytes) -> None:
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assert data[0:2] == b'MZ'
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nbytes = ql.unpack16(data[2:4]) or 0x200 # number of bytes in last block; 0 means it is fully populated
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nblocks = ql.unpack16(data[4:6]) # number of blocks used
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self.size = (nblocks - 1) * 0x200 + nbytes
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self.init_ss = ql.unpack16(data[14:16])
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self.init_sp = ql.unpack16(data[16:18])
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self.init_ip = ql.unpack16(data[20:22])
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self.init_cs = ql.unpack16(data[22:24])
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class QlLoaderDOS(QlLoader):
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def __init__(self, ql: Qiling):
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super(QlLoaderDOS, self).__init__(ql)
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self.ql = ql
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self.old_excepthook = sys.excepthook
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# Hack to print all exceptions if curses has been setup.
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def excepthook(self, tp, value, tb):
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if self.ql.os.stdscr is not None:
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tbmsg = "".join(traceback.format_exception(tp, value, tb))
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self.ql.log.info(f"{tbmsg}")
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self.old_excepthook(tp, value, tb)
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def run(self):
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path = self.ql.path
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profile = self.ql.profile
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# bare com file
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if path.endswith(".DOS_COM"):
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with open(path, "rb") as f:
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content = f.read()
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cs = int(profile.get("COM", "start_cs"), 0)
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ip = int(profile.get("COM", "start_ip"), 0)
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sp = int(profile.get("COM", "start_sp"), 0)
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ss = cs
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base_address = (cs << 4) + ip
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# com file with a dos header
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elif path.endswith(".DOS_EXE"):
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with open(path, "rb") as f:
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content = f.read()
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com = ComParser(self.ql, content)
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cs = com.init_cs
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ip = com.init_ip
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sp = com.init_sp
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ss = com.init_ss
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base_address = 0
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content = content[0x80:]
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elif path.endswith(".DOS_MBR"):
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with open(path, "rb") as f:
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content = f.read()
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cs = 0x0000
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ip = 0x7c00
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sp = 0xfff0
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ss = cs
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base_address = (cs << 4) + ip
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# https://en.wikipedia.org/wiki/Master_boot_record#BIOS_to_MBR_interface
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if not self.ql.os.fs_mapper.has_mapping(0x80):
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self.ql.os.fs_mapper.add_mapping(0x80, QlDisk(path, 0x80))
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# 0x80 -> first drive
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self.ql.arch.regs.dx = 0x80
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else:
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raise NotImplementedError()
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self.ql.arch.regs.cs = cs
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self.ql.arch.regs.ds = cs
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self.ql.arch.regs.es = cs
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self.ql.arch.regs.ss = ss
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self.ql.arch.regs.ip = ip
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self.ql.arch.regs.sp = sp
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self.stack_address = (ss << 4) + sp
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self.start_address = (cs << 4) + ip
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self.stack_size = int(profile.get("COM", "stack_size"), 0)
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self.ticks_per_second = profile.getfloat("KERNEL", "ticks_per_second")
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# map the entire system memory
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self.ql.mem.map(0, 0x100000, info="[FULL]")
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self.ql.mem.write(base_address, content)
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self.load_address = base_address
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self.ql.os.entry_point = self.start_address
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sys.excepthook = self.excepthook |