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05 April 2024, 19:05:47 UTC
Revision 526940e3962620f1a24d5e30c3dac7358194d963 authored by Barry Song on 07 May 2021, 01:05:09 UTC, committed by Linus Torvalds on 07 May 2021, 07:26:33 UTC 
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>
1 parent dc95868
History
Tip revision: 526940e3962620f1a24d5e30c3dac7358194d963 authored by Barry Song on 07 May 2021, 01:05:09 UTC
scripts/gdb: add lx_current support for arm64
Tip revision: 526940e
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arch
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certs
crypto
drivers
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include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.clang-format -rw-r--r-- 16.4 KB
.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 71 bytes
.gitattributes -rw-r--r-- 62 bytes
.gitignore -rw-r--r-- 1.9 KB
.mailmap -rw-r--r-- 19.3 KB
COPYING -rw-r--r-- 496 bytes
CREDITS -rw-r--r-- 98.5 KB
Kbuild -rw-r--r-- 1.3 KB
Kconfig -rw-r--r-- 555 bytes
MAINTAINERS -rw-r--r-- 585.9 KB
Makefile -rw-r--r-- 64.7 KB
README -rw-r--r-- 727 bytes

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