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add some pretty-printer for kthread

master
Mathieu Maret 8 months ago
parent
commit
9fe6d3c7df
2 changed files with 62 additions and 4 deletions
  1. +11
    -0
      README.md
  2. +51
    -4
      custom_gdb_extension.py

+ 11
- 0
README.md View File

@ -16,3 +16,14 @@ To generate iso image
you can also test it
`make self_test`
# Debug
gdb could be launch with debug symbols using :
make debug
Then you can check some matos specific commands or pretty printing with
help user-defined
info pretty-printer (Should contains matos_pretty_printers)

+ 51
- 4
custom_gdb_extension.py View File

@ -1,3 +1,48 @@
from gdb.printing import PrettyPrinter, register_pretty_printer
import gdb
class KthreadPrettyPrinter(object):
def __init__(self, val):
self.val = val
def to_string(self):
result = ""
name = self.val["name"]
state = self.val["state"]
# Should get PC on stack for non-current thread otherwise will only get address in cpu_context_switch
cpuState = self.val["cpuState"]
cmdline = "info line *%s"%int(cpuState["eip"].cast(gdb.lookup_type("long").pointer()))
line = gdb.execute(cmdline, to_string=True)
#line = gdb.find_pc_line(int(cpuState["eip"].cast(gdb.lookup_type("long").pointer()).referenced_value()))
currentThread = gdb.parse_and_eval("currentThread")
if self.val == currentThread:
result += "->"
else:
result += " "
result += "Addr: 0x%x, name: %s, state: %s, PC: %s" % (self.val, name, state, line)
return result
class CustomPrettyPrinterLocator(PrettyPrinter):
"""Given a gdb.Value, search for a custom pretty printer"""
def __init__(self):
super(CustomPrettyPrinterLocator, self).__init__(
"matos_pretty_printers", []
)
def __call__(self, val):
"""Return the custom formatter if the type can be handled"""
typename = gdb.types.get_basic_type(val.type).tag
if typename is None:
typename = val.type.name
if typename == "kthread":
return KthreadPrettyPrinter(val)
class KthreadListDumpCmd(gdb.Command):
"""Prints the kthread list"""
@ -16,8 +61,7 @@ class KthreadListDumpCmd(gdb.Command):
kthread_ptr = val
result = ""
while kthread_ptr != 0 and (idx == 0 or kthread_ptr != head) :
name = kthread_ptr["name"]
result += "\n%d: Addr: 0x%x, name: %s" % (idx, kthread_ptr, name)
result += "\n%d: %s" % (idx, KthreadPrettyPrinter(kthread_ptr).to_string())
kthread_ptr = kthread_ptr["next"]
idx += 1
result = ("Found a Linked List with %d kthread:" % idx) + result
@ -32,13 +76,16 @@ class KthreadListDumpCmd(gdb.Command):
# We can pass args here and use Python CLI utilities like argparse
# to do argument parsing
print("Args Passed: %s" % args)
kthread_ptr_val = gdb.parse_and_eval(args)
if args:
kthread_ptr_val = gdb.parse_and_eval(args)
else:
kthread_ptr_val = gdb.parse_and_eval("currentThread")
if str(kthread_ptr_val.type) != "struct kthread *":
print("Expected pointer argument of type (struct kthread *)")
return
print(self._kthread_list_to_str(kthread_ptr_val))
register_pretty_printer(None, CustomPrettyPrinterLocator(), replace=True)
KthreadListDumpCmd()

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