linux.git/scripts/gdb/linux/modules.py, branch v6.12.80

scripts/gdb/modules: add get module text support

2023-08-21T20:46:22+00:00

When we get an text address from coredump and we cannot find
this address in vmlinux, it might located in kernel module.

We want to know which kernel module it located in.

This GDB scripts can help us to find the target kernel module.

(gdb) lx-getmod-by-textaddr 0xffff800002d305ac
0xffff800002d305ac is in kasan_test.ko

Link: https://lkml.kernel.org/r/20230808083020.22254-3-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee 
Cc: AngeloGioacchino Del Regno 
Cc: Chinwen Chang 
Cc: Matthias Brugger 
Cc: Qun-Wei Lin 
Signed-off-by: Andrew Morton

scripts/gdb: fix 'lx-lsmod' show the wrong size

2023-08-18T17:18:58+00:00

'lsmod' shows total core layout size, so we need to sum up all the
sections in core layout in gdb scripts.

/ # lsmod
kasan_test 200704 0 - Live 0xffff80007f640000

Before patch:
(gdb) lx-lsmod
Address            Module                  Size  Used by
0xffff80007f640000 kasan_test             36864  0

After patch:
(gdb) lx-lsmod
Address            Module                  Size  Used by
0xffff80007f640000 kasan_test            200704  0

Link: https://lkml.kernel.org/r/20230710092852.31049-1-Kuan-Ying.Lee@mediatek.com
Fixes: b4aff7513df3 ("scripts/gdb: use mem instead of core_layout to get the module address")
Signed-off-by: Kuan-Ying Lee 
Reviewed-by: Pankaj Raghav 
Cc: AngeloGioacchino Del Regno 
Cc: Chinwen Chang 
Cc: Jan Kiszka 
Cc: Kieran Bingham 
Cc: Luis Chamberlain 
Cc: Matthias Brugger 
Cc: Qun-Wei Lin 
Signed-off-by: Andrew Morton

scripts/gdb: use mem instead of core_layout to get the module address

2023-04-13T21:03:25+00:00

commit ac3b43283923 ("module: replace module_layout with module_memory")
changed the struct module data structure from module_layout to
module_memory. The core_layout member which is used while loading
modules are not available anymore leading to the following error while
running gdb:

(gdb) lx-symbols
loading vmlinux
Python Exception : There is no member named core_layout.
Error occurred in Python: There is no member named core_layout.

Replace core_layout with its new counterpart mem[MOD_TEXT].

Fixes: ac3b43283923 ("module: replace module_layout with module_memory")
Signed-off-by: Pankaj Raghav 
Signed-off-by: Luis Chamberlain

scripts/gdb: support !CONFIG_MODULES gracefully

2016-05-24T00:04:14+00:00

If CONFIG_MODULES is not enabled, lx-lsmod tries to find a non-existent
symbol and generates an unfriendly traceback:

  (gdb) lx-lsmod
  Address    Module                  Size  Used by
  Traceback (most recent call last):
    File "scripts/gdb/linux/modules.py", line 75, in invoke
      for module in module_list():
    File "scripts/gdb/linux/modules.py", line 24, in module_list
      module_ptr_type = module_type.get_type().pointer()
    File "scripts/gdb/linux/utils.py", line 28, in get_type
      self._type = gdb.lookup_type(self._name)
  gdb.error: No struct type named module.
  Error occurred in Python command: No struct type named module.

Catch the error and return an empty module_list() for a clean command
output as follows:

  (gdb) lx-lsmod
  Address    Module                  Size  Used by
  (gdb)

Link: http://lkml.kernel.org/r/94d533819437408b85ae5864f939dd7ca6fbfcd6.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham 
Signed-off-by: Jan Kiszka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: convert modules usage to lists functions

2016-05-24T00:04:14+00:00

Simplify the module list functions with the new list_for_each_entry
abstractions

Link: http://lkml.kernel.org/r/ad0101c9391088608166fcec26af179868973d86.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham 
Signed-off-by: Jan Kiszka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: Adjust module reference counter reported by lx-lsmod

2016-05-24T00:04:14+00:00

This takes the MODULE_REF_BASE into account.

Link: http://lkml.kernel.org/r/d926d2d54caa034adb964b52215090cbdb875249.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Jan Kiszka 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: account for changes in module data structure

2016-03-22T22:36:02+00:00

Commit 7523e4dc5057 ("module: use a structure to encapsulate layout.")
factored out the module_layout structure.  Adjust the symbol loader and
the lsmod command to this.

Signed-off-by: Jan Kiszka 
Reviewed-by: Kieran Bingham 
Tested-by: Kieran Bingham  (qemu-{ARM,x86})
Cc: Rusty Russell 
Cc: Jiri Kosina 
Cc: Jason Wessel 
Cc: 	[4.4+]
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: fix lx-lsmod refcnt

2015-05-29T01:25:19+00:00

Commit 2f35c41f58a9 ("module: Replace module_ref with atomic_t refcnt")
changes the way refcnt is handled but did not update the gdb script to
use the new variable.

Since refcnt is not per-cpu anymore, we can directly read its value.

Signed-off-by: Adrien Schildknecht 
Reviewed-by: Jan Kiszka 
Cc: Pantelis Koukousoulas 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: convert CpuList to generator function

2015-02-17T22:34:55+00:00

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

scripts/gdb: convert ModuleList to generator function

2015-02-17T22:34:55+00:00

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