m68k: Add helper function handle_kernel_fault()

Add helper function handle_kernel_fault() in signal.c, so frame_extra_sizes
can become static, and to avoid future code duplication.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

3 files changed, 26 insertions, 16 deletions

diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h
index 278c69bad57a..f111b02b704f 100644
--- a/arch/m68k/include/asm/processor.h
+++ b/arch/m68k/include/asm/processor.h
@@ -113,6 +113,8 @@ static inline void start_thread(struct pt_regs * regs, unsigned long pc,
         wrusp(usp);
 }
 
+extern int handle_kernel_fault(struct pt_regs *regs);
+
 #else
 
 /*
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index d12c3b0d9e4f..a0afc239304e 100644
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -42,6 +42,7 @@
 #include <linux/personality.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
+#include <linux/module.h>
 
 #include <asm/setup.h>
 #include <asm/uaccess.h>
@@ -51,7 +52,7 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
-const int frame_extra_sizes[16] = {
+static const int frame_extra_sizes[16] = {
   [1]   = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
   [2]   = sizeof(((struct frame *)0)->un.fmt2),
   [3]   = sizeof(((struct frame *)0)->un.fmt3),
@@ -69,6 +70,27 @@ const int frame_extra_sizes[16] = {
   [15]  = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
 };
 
+int handle_kernel_fault(struct pt_regs *regs)
+{
+        const struct exception_table_entry *fixup;
+        struct pt_regs *tregs;
+
+        /* Are we prepared to handle this kernel fault? */
+        fixup = search_exception_tables(regs->pc);
+        if (!fixup)
+                return 0;
+
+        /* Create a new four word stack frame, discarding the old one. */
+        regs->stkadj = frame_extra_sizes[regs->format];
+        tregs = (struct pt_regs *)((long)regs + regs->stkadj);
+        tregs->vector = regs->vector;
+        tregs->format = 0;
+        tregs->pc = fixup->fixup;
+        tregs->sr = regs->sr;
+
+        return 1;
+}
+
 /*
  * Atomically swap in the new signal mask, and wait for a signal.
  */
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index a96394a0333d..2db6099784ba 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -18,7 +18,6 @@
 #include <asm/pgalloc.h>
 
 extern void die_if_kernel(char *, struct pt_regs *, long);
-extern const int frame_extra_sizes[]; /* in m68k/kernel/signal.c */
 
 int send_fault_sig(struct pt_regs *regs)
 {
@@ -35,21 +34,8 @@ int send_fault_sig(struct pt_regs *regs)
                 force_sig_info(siginfo.si_signo,
                                &siginfo, current);
         } else {
-                const struct exception_table_entry *fixup;
-
-                /* Are we prepared to handle this kernel fault? */
-                if ((fixup = search_exception_tables(regs->pc))) {
-                        struct pt_regs *tregs;
-                        /* Create a new four word stack frame, discarding the old
-                           one.  */
-                        regs->stkadj = frame_extra_sizes[regs->format];
-                        tregs = (struct pt_regs *)((ulong)regs + regs->stkadj);
-                        tregs->vector = regs->vector;
-                        tregs->format = 0;
-                        tregs->pc = fixup->fixup;
-                        tregs->sr = regs->sr;
+                if (handle_kernel_fault(regs))
                         return -1;
-                }
 
                 //if (siginfo.si_signo == SIGBUS)
                 //      force_sig_info(siginfo.si_signo,