48 lines
1.2 KiB
Python
Executable file
48 lines
1.2 KiB
Python
Executable file
#!/usr/bin/env python
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# Decode a stack trace from getcallerpcs() to kernel symbols.
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# Peter H. Froehlich <phf@acm.org>, 600.318/418, Spring 2011
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#
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# $ ./depcs 1072fa 1073c4 106d4a 103024 102fdd 0 0 0 0 0
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# 1078010 ['mappages']
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# 1078212 ['setupkvm']
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# 1076554 ['kvmalloc']
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# 1060900 ['mainc']
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# 1060829 ['jmpkstack']
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import sys
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# read the symbols, mapping each address to all known names
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raw = {}
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with open("kernel.sym") as f:
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for s in f:
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adr, sym = s.strip().split()
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adr = int(adr, 16)
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if adr in raw:
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raw[adr].append(sym)
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else:
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raw[adr] = [sym]
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# for a given address, we need to determine what range it
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# lies in; there are fancy data structures or this, which
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# we ignore; let's just sort the keys instead
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sort = sorted(raw.keys())
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# now we can find the least key greater than an address;
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# if there's none, we use the last address we know; doh!
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def least(x):
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for i in range(len(sort)-1):
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if sort[i] <= x < sort[i+1]:
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return sort[i]
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return sort[-1]
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# therefore we can decode a backtrace (ignoring address
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# 0 since it's useless for xv6)
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for adr in sys.argv[1:]:
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adr = int(adr, 16)
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if adr != 0:
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print adr, raw[least(adr)]
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