linux/Documentation/dev-tools
Barry Song 526940e396 scripts/gdb: add lx_current support for arm64
arm64 uses SP_EL0 to save the current task_struct address.  While running
in EL0, SP_EL0 is clobbered by userspace.  So if the upper bit is not 1
(not TTBR1), the current address is invalid.  This patch checks the upper
bit of SP_EL0, if the upper bit is 1, lx_current() of arm64 will return
the derefrence of current task.  Otherwise, lx_current() will tell users
they are running in userspace(EL0).

While arm64 is running in EL0, it is actually pointless to print current
task as the memory of kernel space is not accessible in EL0.

Link: https://lkml.kernel.org/r/20210314203444.15188-3-song.bao.hua@hisilicon.com
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-05-07 00:26:33 -07:00
..
kunit Documentation: kunit: add tips for using current->kunit_test 2021-04-07 16:40:37 -06:00
checkpatch.rst docs: document all error message types in checkpatch 2021-03-25 11:47:42 -06:00
coccinelle.rst Documentation: Coccinelle: Improve command example for debugging patches 2020-12-03 15:45:18 -07:00
gcov.rst docs/gcov: Convert two tags to ref in dev-tools/gov.rst 2021-04-08 11:19:43 -06:00
gdb-kernel-debugging.rst scripts/gdb: add lx_current support for arm64 2021-05-07 00:26:33 -07:00
index.rst Documentation: dev-tools: Add Testing Overview 2021-04-15 14:53:02 -06:00
kasan.rst kasan: docs: update tests section 2021-04-30 11:20:42 -07:00
kcov.rst Documentation: fix typos found in process, dev-tools, and doc-guide subdirectories 2020-12-03 15:55:04 -07:00
kcsan.rst kcsan: Add missing license and copyright headers 2021-03-08 14:27:43 -08:00
kfence.rst kfence: report sensitive information based on no_hash_pointers 2021-02-26 09:41:02 -08:00
kgdb.rst Documentation: kgdb: Fix a typo 2020-11-18 13:47:17 -07:00
kmemleak.rst mm,kmemleak-test.c: move kmemleak-test.c to samples dir 2020-10-13 18:38:27 -07:00
kselftest.rst Documentation: kselftest: fix path to test module files 2021-04-02 16:17:18 -06:00
sparse.rst doc: add link to sparse's home page/internal docs 2020-07-05 14:32:56 -06:00
testing-overview.rst Documentation: dev-tools: Add Testing Overview 2021-04-15 14:53:02 -06:00
ubsan.rst ubsan: remove UBSAN_MISC in favor of individual options 2020-12-15 22:46:19 -08:00