powerpc: Move the patch_exception to a common place

So that it can be used by other codes. No function change.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index 17e5b2364312..d5edbeb8eb82 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -159,6 +159,21 @@ unsigned int translate_branch(const unsigned int *dest, const unsigned int *src)
         return 0;
 }
 
+#ifdef CONFIG_PPC_BOOK3E_64
+void __patch_exception(int exc, unsigned long addr)
+{
+        extern unsigned int interrupt_base_book3e;
+        unsigned int *ibase = &interrupt_base_book3e;
+
+        /* Our exceptions vectors start with a NOP and -then- a branch
+         * to deal with single stepping from userspace which stops on
+         * the second instruction. Thus we need to patch the second
+         * instruction of the exception, not the first one
+         */
+
+        patch_branch(ibase + (exc / 4) + 1, addr, 0);
+}
+#endif
 
 #ifdef CONFIG_CODE_PATCHING_SELFTEST