forked from BSB-WS23/mpstubs
69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
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import gdb
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from . import helper
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class IDT:
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class InterruptTrapGate:
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def __init__(self, raw):
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self.raw = raw # 128-bit type
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self.offset = helper.bits(self.raw, 0, 16) \
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| helper.bits(self.raw, 32 + 16, 16) << 16\
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| helper.bits(self.raw, 64, 32) << 32
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self.segment = helper.bits(self.raw, 16, 16)
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self.ist = helper.bits(self.raw, 32, 4)
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self.type = helper.bits(self.raw, 32 + 8, 4)
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self.dpl = helper.bits(self.raw, 32 + 13, 2)
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self.p = helper.bits(self.raw, 32 + 15, 1)
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def _get_symbol(self):
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block = gdb.block_for_pc(self.offset)
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if block is None:
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return "?"
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if block.function is None:
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return "?"
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return block.function
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def __str__(self):
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symbol = self._get_symbol()
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addr = f"0x{self.segment:x}:0x{self.offset:x}"
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bits = "|".join([
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f"off:{self.offset:x}", f"p:{self.p}",
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f"dpl:{self.dpl}", f"type:{self.type:x}",
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f"ist:{self.ist:x}", f"ss:{self.segment:x}"
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])
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return f"{addr} <{symbol}> [{bits}] raw={self.raw:032x}"
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def __init__(self, mmu, mapping, base, limit):
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self.mmu = mmu
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self.mapping = mapping
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self.base = base
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self.limit = limit
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self.desc_size = 16
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self.nentry = (limit + 1) // self.desc_size
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pass
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def print(self):
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entries = []
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for i in range(0, self.nentry):
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offset = i * self.desc_size
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desc_bytes = self.mmu.linear_bytes(
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self.mapping,
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self.base + offset,
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self.desc_size
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)
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desc = int.from_bytes(desc_bytes, 'little')
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gate = self.InterruptTrapGate(desc)
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entries.append((i, gate))
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def cmp_eq(a, b):
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return a.offset == b.offset and a.segment == b.segment
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compact = helper.compact_entries(entries, cmp_eq)
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for start, stop, gate in compact:
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if start == stop:
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print(f"[{start}]:\t{str(gate)}")
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else:
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print(f"[{start}-{stop}]:\t{str(gate)}")
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pass
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pass
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