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csky: Fixup kprobes handler couldn't change pc 

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>
pull/496/merge
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 .macro mcount_exit_regs
RESTORE_REGS_FTRACE RESTORE_REGS_FTRACE
ldw t1, (sp, 0) subi sp, 152
ldw t1, (sp, 4)
addi sp, 152
ldw r8, (sp, 4) ldw r8, (sp, 4)
ldw lr, (sp, 8) ldw lr, (sp, 8)
addi sp, 12 addi sp, 12