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Commit 82b41e3d authored by Jan Kiszka's avatar Jan Kiszka Committed by Linus Torvalds
Browse files

scripts/gdb: add automatic symbol reloading on module insertion 



This installs a silent breakpoint on the do_init_module function.  The
breakpoint handler will try to load symbols from the module files found
during lx-symbols execution.  This way, breakpoints can be set to module
initialization functions, and there is no need to explicitly call
lx-symbols after (re-)loading a module.

Signed-off-by: default avatarJan 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent be02a186

scripts/gdb/linux/symbols.py

+39 −0
Original line number Diff line number Diff line
@@ -19,6 +19,30 @@ import string 
from linux import modules, utils





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



            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)

            return False





class LxSymbols(gdb.Command):

    """(Re-)load symbols of Linux kernel and currently loaded modules.
@@ -30,6 +54,8 @@ 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,
@@ -87,6 +113,8 @@ lx-symbols command.""" 
                addr=module_addr,

                sections=self._section_arguments(module))

            gdb.execute(cmdline, to_string=True)

            if not module_name in self.loaded_modules:

                self.loaded_modules.append(module_name)

        else:

            gdb.write("no module object found for '{0}'\n".format(module_name))
@@ -104,6 +132,7 @@ lx-symbols command.""" 
        gdb.execute("symbol-file", to_string=True)

        gdb.execute("symbol-file vmlinux")



        self.loaded_modules = []

        module_list = modules.ModuleList()

        if not module_list:

            gdb.write("no modules found\n")
@@ -123,5 +152,15 @@ lx-symbols command.""" 


        self.load_all_symbols()



        if hasattr(gdb, 'Breakpoint'):

            if not self.breakpoint is 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()