3 files changed, 40 insertions, 9 deletions

diff --git a/arch/m68k/kernel/setup.c b/arch/m68k/kernel/setup.c
index b3963ab3d149..334d83640376 100644
--- a/arch/m68k/kernel/setup.c
+++ b/arch/m68k/kernel/setup.c
@@ -42,6 +42,7 @@
 #ifdef CONFIG_SUN3X
 #include <asm/dvma.h>
 #endif
+#include <asm/natfeat.h>
 
 #if !FPSTATESIZE || !NR_IRQS
 #warning No CPU/platform type selected, your kernel will not work!
@@ -324,6 +325,10 @@ void __init setup_arch(char **cmdline_p)
 		panic("No configuration setup");
 	}
 
+#ifdef CONFIG_NATFEAT
+	nf_init();
+#endif
+
 	paging_init();
 
 #ifndef CONFIG_SUN3
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/kernel/traps.c b/arch/m68k/kernel/traps.c
index ada4f4cca811..4022bbc28878 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -48,10 +48,7 @@ asmlinkage void nmihandler(void);
 asmlinkage void fpu_emu(void);
 #endif
 
-e_vector vectors[256] = {
-	[VEC_BUSERR]	= buserr,
-	[VEC_SYS]	= system_call,
-};
+e_vector vectors[256];
 
 /* nmi handler for the Amiga */
 asm(".text\n"
@@ -61,10 +58,11 @@ asm(".text\n"
 /*
  * this must be called very early as the kernel might
  * use some instruction that are emulated on the 060
+ * and so we're prepared for early probe attempts (e.g. nf_init).
  */
 void __init base_trap_init(void)
 {
-	if(MACH_IS_SUN3X) {
+	if (MACH_IS_SUN3X) {
 		extern e_vector *sun3x_prom_vbr;
 
 		__asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
@@ -79,6 +77,10 @@ void __init base_trap_init(void)
 
 		vectors[VEC_UNIMPII] = unimp_vec;
 	}
+
+	vectors[VEC_BUSERR] = buserr;
+	vectors[VEC_ILLEGAL] = trap;
+	vectors[VEC_SYS] = system_call;
 }
 
 void __init trap_init (void)
@@ -1055,9 +1057,11 @@ asmlinkage void trap_c(struct frame *fp)
 	siginfo_t info;
 
 	if (fp->ptregs.sr & PS_S) {
-		if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
-			/* traced a trapping instruction */
-		} else
+		if (fp->ptregs.vector == VEC_TRACE << 2) {
+			/* traced a trapping instruction on a 68020/30,
+			 * real exception will be executed afterwards.
+			 */
+		} else if (!handle_kernel_fault(&fp->ptregs))
 			bad_super_trap(fp);
 		return;
 	}