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csky: Fixup kprobes handler couldn't change pc

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The "Changing Execution Path" section in the Documentation/kprobes.txt
said:

Since kprobes can probe into a running kernel code, it can change the
register set, including instruction pointer.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren 2020-07-28 16:25:23 +00:00
parent f788bb2fb9
commit a5447fb9b3
1 changed files with 3 additions and 1 deletions
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4
arch/csky/abiv2/mcount.S
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@ -55,7 +55,9 @@
.macro mcount_exit_regs
RESTORE_REGS_FTRACE
ldw t1, (sp, 0)
subi sp, 152
ldw t1, (sp, 4)
addi sp, 152
ldw r8, (sp, 4)
ldw lr, (sp, 8)
addi sp, 12