powerpc: Fix kernel thread creation on ABIv2

Change how we setup registers for ret_from_kernel_thread. In
ABIv1, instead of passing a function descriptor in, dereference
it and pass the target in directly.

Use ppc_global_function_entry to get it right on both ABIv1 and ABIv2.

Signed-off-by: Anton Blanchard <anton@samba.org>

1 files changed, 5 insertions, 12 deletions

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 31d021506d21..2ae1b99166c6 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -54,6 +54,7 @@
 #ifdef CONFIG_PPC64
 #include <asm/firmware.h>
 #endif
+#include <asm/code-patching.h>
 #include <linux/kprobes.h>
 #include <linux/kdebug.h>
 
@@ -1108,7 +1109,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
                 struct thread_info *ti = (void *)task_stack_page(p);
                 memset(childregs, 0, sizeof(struct pt_regs));
                 childregs->gpr[1] = sp + sizeof(struct pt_regs);
-                childregs->gpr[14] = usp;       /* function */
+                /* function */
+                if (usp)
+                        childregs->gpr[14] = ppc_function_entry((void *)usp);
 #ifdef CONFIG_PPC64
                 clear_tsk_thread_flag(p, TIF_32BIT);
                 childregs->softe = 1;
@@ -1187,17 +1190,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
         if (cpu_has_feature(CPU_FTR_HAS_PPR))
                 p->thread.ppr = INIT_PPR;
 #endif
-        /*
-         * The PPC64 ABI makes use of a TOC to contain function 
-         * pointers.  The function (ret_from_except) is actually a pointer
-         * to the TOC entry.  The first entry is a pointer to the actual
-         * function.
-         */
-#ifdef CONFIG_PPC64
-        kregs->nip = *((unsigned long *)f);
-#else
-        kregs->nip = (unsigned long)f;
-#endif
+        kregs->nip = ppc_function_entry(f);
         return 0;
 }