summaryrefslogtreecommitdiff
path: root/arch/powerpc/lib/code-patching.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/lib/code-patching.c')
-rw-r--r--arch/powerpc/lib/code-patching.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index 753d591f1b52..c312955977ce 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -14,12 +14,20 @@
#include <asm/page.h>
#include <asm/code-patching.h>
#include <asm/uaccess.h>
+#include <asm/setup.h>
+#include <asm/sections.h>
int patch_instruction(unsigned int *addr, unsigned int instr)
{
int err;
+ /* Make sure we aren't patching a freed init section */
+ if (*PTRRELOC(&init_mem_is_free) && init_section_contains(addr, 4)) {
+ pr_debug("Skipping init section patching addr: 0x%px\n", addr);
+ return 0;
+ }
+
__put_user_size(instr, addr, 4, err);
if (err)
return err;
@@ -32,6 +40,22 @@ int patch_branch(unsigned int *addr, unsigned long target, int flags)
return patch_instruction(addr, create_branch(addr, target, flags));
}
+int patch_branch_site(s32 *site, unsigned long target, int flags)
+{
+ unsigned int *addr;
+
+ addr = (unsigned int *)((unsigned long)site + *site);
+ return patch_instruction(addr, create_branch(addr, target, flags));
+}
+
+int patch_instruction_site(s32 *site, unsigned int instr)
+{
+ unsigned int *addr;
+
+ addr = (unsigned int *)((unsigned long)site + *site);
+ return patch_instruction(addr, instr);
+}
+
unsigned int create_branch(const unsigned int *addr,
unsigned long target, int flags)
{