01 Mar, 2015
1 commit
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This got lost during the initial merge process: Python requires an
__init__.py script, even if empty, in order to accept a directory as
package. Add it, this time as a non-empty file.Signed-off-by: Jan Kiszka
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
18 Feb, 2015
25 commits
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While reporting the (refreshed) list of modules on automatic updates we
may hit the page boundary of the output console and cause a stop if
pagination is enabled. However, gdb does not accept user input while
running over the breakpoint handler. So we get stuck, and the user is
forced to interrupt gdb.Resolve this by disabling pagination during automatic symbol updates. We
restore the user's configuration once done.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Yet another code simplification.
Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Analogously to the task list, convert the module list to a generator
function. It noticeably simplifies the code.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The iterator does not return any task_struct from the thread_group list
because the first condition in the 'if not t or ...' will only be the
first time None.Instead of keeping track of the state ourself in the next() function, we
fall back using Python's generator.Signed-off-by: Daniel Wagner
Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Using the gdb scripts leaves byte-compiled python files in the scripts/
directory. These should be ignored by git.[jan.kiszka@siemens.com: drop redundant mrproper rule as suggested by Michal]
Signed-off-by: Daniel Thompson
Signed-off-by: Jan Kiszka
Cc: Michal Marek
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
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
Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This adds a lsmod-like command to list all currently loaded modules of the
target.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Will be used first to count module references. It is optimized to read
the mask only once per stop.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This is a shorthand for *$lx_per_cpu("current_task"), i.e. a convenience
function to retrieve the currently running task of the active context.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This function allows to obtain a per-cpu variable, either of the current
or an explicitly specified CPU.Note: sparc64 version is untested.
Signed-off-by: Jan Kiszka
Cc: "David S. Miller"
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This helper probes the type of the gdb server. Supported are QEMU and
KGDB so far. Knowledge about the gdb server is required e.g. to
retrieve the current CPU or current task.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add the internal helper get_thread_info that calculates the thread_info
from a given task variable. Also export this service as a convenience
function.Note: ia64 version is untested.
Signed-off-by: Jan Kiszka
Cc: Tony Luck
Cc: Fenghua Yu
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This helper caches to result of "show architecture" and matches the
provided arch (sub-)string against that output.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add the helper task_by_pid that can look up a task by its PID. Also
export it as a convenience function.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This class allows to iterate over all tasks of the target.
Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This pokes into the log buffer of the debugged kernel, dumping it to the
gdb console. Helping in case the target should or can no longer execute
dmesg itself.Signed-off-by: Jan Kiszka
Cc: Kay Sievers
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add helpers for reading integers from target memory buffers. Required
when caching the memory access is more efficient than reading individual
values via gdb.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Parse the target endianness from the output of "show endian" and cache the
result to return it via the new helper get_target_endiannes. We will need
it for reading integers from buffers that contain target memory.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add the internal helper get_module_by_name to obtain the module structure
corresponding to the given name. Also export this service as a
convenience function.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
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: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This is probably the most useful helper when debugging kernel modules:
lx-symbols first reloads vmlinux. Then it searches recursively for *.ko
files in the specified paths and the current directory. Finally it walks
the kernel's module list, issuing the necessary add-symbol-file command
for each loaded module so that gdb knows which module symbol corresponds
to which address. It also looks up variable sections (bss, data, rodata)
and appends their address to the add-symbole-file command line. This
allows to access global module variables just like any other variable.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Will soon be used for loading symbols, printing global variables or
listing modules.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Provide an internal helper with container_of semantics. As type lookups
are very slow in gdb-python and we need a type "long" for this, cache the
reference to this type object. Then export the helper also as a
convenience function form use at the gdb command line.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Type lookups are very slow in gdb-python which is often noticeable when
iterating over a number of objects. Introduce the helper class CachedType
that keeps a reference to a gdb.Type object but also refreshes it after an
object file has been loaded.Signed-off-by: Jan Kiszka
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This provides the basic infrastructure to load kernel-specific python
helper scripts when debugging the kernel in gdb.The loading mechanism is based on gdb loading for -gdb.py when
opening . Therefore, this places a corresponding link to the
main helper script into the output directory that contains vmlinux.The main scripts will pull in submodules containing Linux specific gdb
commands and functions. To avoid polluting the source directory with
compiled python modules, we link to them from the object directory.Due to gdb.parse_and_eval and string redirection for gdb.execute, we
depend on gdb >= 7.2.This feature is enabled via CONFIG_GDB_SCRIPTS.
Signed-off-by: Jan Kiszka
Acked-by: Michal Marek [kbuild stuff]
Cc: Thomas Gleixner
Cc: Jason Wessel
Cc: Andi Kleen
Cc: Ben Widawsky
Cc: Borislav Petkov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
