linux_dsm_epyc7002/scripts/gdb/linux/symbols.py

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#
# gdb helper commands and functions for Linux kernel debugging
#
# load kernel and module symbols
#
# Copyright (c) Siemens AG, 2011-2013
#
# Authors:
# Jan Kiszka <jan.kiszka@siemens.com>
#
# This work is licensed under the terms of the GNU GPL version 2.
#
import gdb
import os
import re
from linux import modules
if hasattr(gdb, 'Breakpoint'):
class LoadModuleBreakpoint(gdb.Breakpoint):
def __init__(self, spec, gdb_command):
super(LoadModuleBreakpoint, self).__init__(spec, internal=True)
self.silent = True
self.gdb_command = gdb_command
def stop(self):
module = gdb.parse_and_eval("mod")
module_name = module['name'].string()
cmd = self.gdb_command
# enforce update if object file is not found
cmd.module_files_updated = False
# Disable pagination while reporting symbol (re-)loading.
# The console input is blocked in this context so that we would
# get stuck waiting for the user to acknowledge paged output.
show_pagination = gdb.execute("show pagination", to_string=True)
pagination = show_pagination.endswith("on.\n")
gdb.execute("set pagination off")
if module_name in cmd.loaded_modules:
gdb.write("refreshing all symbols to reload module "
"'{0}'\n".format(module_name))
cmd.load_all_symbols()
else:
cmd.load_module_symbols(module)
# restore pagination state
gdb.execute("set pagination %s" % ("on" if pagination else "off"))
return False
class LxSymbols(gdb.Command):
"""(Re-)load symbols of Linux kernel and currently loaded modules.
The kernel (vmlinux) is taken from the current working directly. Modules (.ko)
are scanned recursively, starting in the same directory. Optionally, the module
search path can be extended by a space separated list of paths passed to the
lx-symbols command."""
module_paths = []
module_files = []
module_files_updated = False
loaded_modules = []
breakpoint = None
def __init__(self):
super(LxSymbols, self).__init__("lx-symbols", gdb.COMMAND_FILES,
gdb.COMPLETE_FILENAME)
def _update_module_files(self):
self.module_files = []
for path in self.module_paths:
gdb.write("scanning for modules in {0}\n".format(path))
for root, dirs, files in os.walk(path):
for name in files:
if name.endswith(".ko"):
self.module_files.append(root + "/" + name)
self.module_files_updated = True
def _get_module_file(self, module_name):
module_pattern = ".*/{0}\.ko$".format(
scripts/gdb: port to python3 / gdb7.7 I tried to use these scripts in an ubuntu 14.04 host (gdb 7.7 compiled against python 3.3) but there were several errors. I believe this patch fixes these issues so that the commands now work (I tested lx-symbols, lx-dmesg, lx-lsmod). Main issues that needed to be resolved: * In python 2 iterators have a "next()" method. In python 3 it is __next__() instead (so let's just add both). * In older python versions there was an implicit conversion in object.__format__() (used when an object is in string.format()) where it was converting the object to str first and then calling str's __format__(). This has now been removed so we must explicitly convert to str the objects for which we need to keep this behavior. * In dmesg.py: in python 3 log_buf is now a "memoryview" object which needs to be converted to a string in order to use string methods like "splitlines()". Luckily memoryview exists in python 2.7.6 as well, so we can convert log_buf to memoryview and use the same code in both python 2 and python 3. This version of the patch has now been tested with gdb 7.7 and both python 3.4 and python 2.7.6 (I think asking for at least python 2.7.6 is a reasonable requirement instead of complicating the code with version checks etc). Signed-off-by: Pantelis Koukousoulas <pktoss@gmail.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-18 04:47:35 +07:00
module_name.replace("_", r"[_\-]"))
for name in self.module_files:
if re.match(module_pattern, name) and os.path.exists(name):
return name
return None
def _section_arguments(self, module):
try:
sect_attrs = module['sect_attrs'].dereference()
except gdb.error:
return ""
attrs = sect_attrs['attrs']
section_name_to_address = {
attrs[n]['name'].string(): attrs[n]['address']
scripts/gdb: port to python3 / gdb7.7 I tried to use these scripts in an ubuntu 14.04 host (gdb 7.7 compiled against python 3.3) but there were several errors. I believe this patch fixes these issues so that the commands now work (I tested lx-symbols, lx-dmesg, lx-lsmod). Main issues that needed to be resolved: * In python 2 iterators have a "next()" method. In python 3 it is __next__() instead (so let's just add both). * In older python versions there was an implicit conversion in object.__format__() (used when an object is in string.format()) where it was converting the object to str first and then calling str's __format__(). This has now been removed so we must explicitly convert to str the objects for which we need to keep this behavior. * In dmesg.py: in python 3 log_buf is now a "memoryview" object which needs to be converted to a string in order to use string methods like "splitlines()". Luckily memoryview exists in python 2.7.6 as well, so we can convert log_buf to memoryview and use the same code in both python 2 and python 3. This version of the patch has now been tested with gdb 7.7 and both python 3.4 and python 2.7.6 (I think asking for at least python 2.7.6 is a reasonable requirement instead of complicating the code with version checks etc). Signed-off-by: Pantelis Koukousoulas <pktoss@gmail.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-18 04:47:35 +07:00
for n in range(int(sect_attrs['nsections']))}
args = []
for section_name in [".data", ".data..read_mostly", ".rodata", ".bss"]:
address = section_name_to_address.get(section_name)
if address:
args.append(" -s {name} {addr}".format(
name=section_name, addr=str(address)))
return "".join(args)
def load_module_symbols(self, module):
module_name = module['name'].string()
module_addr = str(module['core_layout']['base']).split()[0]
module_file = self._get_module_file(module_name)
if not module_file and not self.module_files_updated:
self._update_module_files()
module_file = self._get_module_file(module_name)
if module_file:
gdb.write("loading @{addr}: {filename}\n".format(
addr=module_addr, filename=module_file))
cmdline = "add-symbol-file {filename} {addr}{sections}".format(
filename=module_file,
addr=module_addr,
sections=self._section_arguments(module))
gdb.execute(cmdline, to_string=True)
if module_name not in self.loaded_modules:
self.loaded_modules.append(module_name)
else:
gdb.write("no module object found for '{0}'\n".format(module_name))
def load_all_symbols(self):
gdb.write("loading vmlinux\n")
# Dropping symbols will disable all breakpoints. So save their states
# and restore them afterward.
saved_states = []
if hasattr(gdb, 'breakpoints') and not gdb.breakpoints() is None:
for bp in gdb.breakpoints():
saved_states.append({'breakpoint': bp, 'enabled': bp.enabled})
# drop all current symbols and reload vmlinux
gdb.execute("symbol-file", to_string=True)
gdb.execute("symbol-file vmlinux")
self.loaded_modules = []
module_list = modules.module_list()
if not module_list:
gdb.write("no modules found\n")
else:
[self.load_module_symbols(module) for module in module_list]
for saved_state in saved_states:
saved_state['breakpoint'].enabled = saved_state['enabled']
def invoke(self, arg, from_tty):
self.module_paths = arg.split()
self.module_paths.append(os.getcwd())
# enforce update
self.module_files = []
self.module_files_updated = False
self.load_all_symbols()
if hasattr(gdb, 'Breakpoint'):
if self.breakpoint is not None:
self.breakpoint.delete()
self.breakpoint = None
self.breakpoint = LoadModuleBreakpoint(
"kernel/module.c:do_init_module", self)
else:
gdb.write("Note: symbol update on module loading not supported "
"with this gdb version\n")
LxSymbols()