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 <[email protected]> Cc: Arnd Bergmann <[email protected]>
devinus · Jul 31, 2020 · a5447fb · a5447fb
1 parent f788bb2
commit a5447fb
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/arch/csky/abiv2/mcount.S b/arch/csky/abiv2/mcount.S
@@ -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