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91 lines
3.1 KiB
91 lines
3.1 KiB
from gdb.printing import PrettyPrinter, register_pretty_printer
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import gdb
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class KthreadPrettyPrinter(object):
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def __init__(self, val):
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self.val = val
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def to_string(self):
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result = ""
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name = self.val["name"]
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state = self.val["state"]
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# Should get PC on stack for non-current thread otherwise will only get address in cpu_context_switch
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cpuState = self.val["cpuState"]
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cmdline = "info line *%s"%int(cpuState["eip"].cast(gdb.lookup_type("long").pointer()))
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line = gdb.execute(cmdline, to_string=True)
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#line = gdb.find_pc_line(int(cpuState["eip"].cast(gdb.lookup_type("long").pointer()).referenced_value()))
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currentThread = gdb.parse_and_eval("currentThread")
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if self.val == currentThread:
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result += "->"
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else:
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result += " "
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result += "Addr: 0x%x, name: %s, state: %s, PC: %s" % (self.val, name, state, line)
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return result
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class CustomPrettyPrinterLocator(PrettyPrinter):
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"""Given a gdb.Value, search for a custom pretty printer"""
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def __init__(self):
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super(CustomPrettyPrinterLocator, self).__init__(
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"matos_pretty_printers", []
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)
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def __call__(self, val):
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"""Return the custom formatter if the type can be handled"""
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typename = gdb.types.get_basic_type(val.type).tag
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if typename is None:
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typename = val.type.name
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if typename == "kthread":
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return KthreadPrettyPrinter(val)
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class KthreadListDumpCmd(gdb.Command):
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"""Prints the kthread list"""
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def __init__(self):
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super(KthreadListDumpCmd, self).__init__(
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"kthread_list_dump", gdb.COMMAND_USER
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)
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def _kthread_list_to_str(self, val):
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"""Walk through the Kthread list.
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We will simply follow the 'next' pointers until we encounter the HEAD again
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"""
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idx = 0
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head = val
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kthread_ptr = val
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result = ""
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while kthread_ptr != 0 and (idx == 0 or kthread_ptr != head) :
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result += "\n%d: %s" % (idx, KthreadPrettyPrinter(kthread_ptr).to_string())
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kthread_ptr = kthread_ptr["next"]
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idx += 1
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result = ("Found a Linked List with %d kthread:" % idx) + result
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return result
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def complete(self, text, word):
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# We expect the argument passed to be a symbol so fallback to the
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# internal tab-completion handler for symbols
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return gdb.COMPLETE_SYMBOL
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def invoke(self, args, from_tty):
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# We can pass args here and use Python CLI utilities like argparse
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# to do argument parsing
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print("Args Passed: %s" % args)
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if args:
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kthread_ptr_val = gdb.parse_and_eval(args)
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else:
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kthread_ptr_val = gdb.parse_and_eval("currentThread")
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if str(kthread_ptr_val.type) != "struct kthread *":
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print("Expected pointer argument of type (struct kthread *)")
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return
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print(self._kthread_list_to_str(kthread_ptr_val))
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register_pretty_printer(None, CustomPrettyPrinterLocator(), replace=True)
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KthreadListDumpCmd()
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