1 files changed, 104 insertions, 0 deletions

diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index 89362f2bb56a..a76452ca964e 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -706,6 +706,88 @@ create_atc_entry:
 #endif /* CPU_M68020_OR_M68030 */
 #endif /* !CONFIG_SUN3 */
 
+#if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
+#include <asm/mcfmmu.h>
+
+/*
+ *      The following table converts the FS encoding of a ColdFire
+ *      exception stack frame into the error_code value needed by
+ *      do_fault.
+*/
+static const unsigned char fs_err_code[] = {
+        0,  /* 0000 */
+        0,  /* 0001 */
+        0,  /* 0010 */
+        0,  /* 0011 */
+        1,  /* 0100 */
+        0,  /* 0101 */
+        0,  /* 0110 */
+        0,  /* 0111 */
+        2,  /* 1000 */
+        3,  /* 1001 */
+        2,  /* 1010 */
+        0,  /* 1011 */
+        1,  /* 1100 */
+        1,  /* 1101 */
+        0,  /* 1110 */
+        0   /* 1111 */
+};
+
+static inline void access_errorcf(unsigned int fs, struct frame *fp)
+{
+        unsigned long mmusr, addr;
+        unsigned int err_code;
+        int need_page_fault;
+
+        mmusr = mmu_read(MMUSR);
+        addr = mmu_read(MMUAR);
+
+        /*
+         * error_code:
+         *      bit 0 == 0 means no page found, 1 means protection fault
+         *      bit 1 == 0 means read, 1 means write
+         */
+        switch (fs) {
+        case  5:  /* 0101 TLB opword X miss */
+                need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0);
+                addr = fp->ptregs.pc;
+                break;
+        case  6:  /* 0110 TLB extension word X miss */
+                need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1);
+                addr = fp->ptregs.pc + sizeof(long);
+                break;
+        case 10:  /* 1010 TLB W miss */
+                need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0);
+                break;
+        case 14: /* 1110 TLB R miss */
+                need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0);
+                break;
+        default:
+                /* 0000 Normal  */
+                /* 0001 Reserved */
+                /* 0010 Interrupt during debug service routine */
+                /* 0011 Reserved */
+                /* 0100 X Protection */
+                /* 0111 IFP in emulator mode */
+                /* 1000 W Protection*/
+                /* 1001 Write error*/
+                /* 1011 Reserved*/
+                /* 1100 R Protection*/
+                /* 1101 R Protection*/
+                /* 1111 OEP in emulator mode*/
+                need_page_fault = 1;
+                break;
+        }
+
+        if (need_page_fault) {
+                err_code = fs_err_code[fs];
+                if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */
+                        err_code |= 2; /* bit1 - write, bit0 - protection */
+                do_page_fault(&fp->ptregs, addr, err_code);
+        }
+}
+#endif /* CONFIG_COLDFIRE CONFIG_MMU */
+
 asmlinkage void buserr_c(struct frame *fp)
 {
         /* Only set esp0 if coming from user mode */
@@ -716,6 +798,28 @@ asmlinkage void buserr_c(struct frame *fp)
         printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format);
 #endif
 
+#if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
+        if (CPU_IS_COLDFIRE) {
+                unsigned int fs;
+                fs = (fp->ptregs.vector & 0x3) |
+                        ((fp->ptregs.vector & 0xc00) >> 8);
+                switch (fs) {
+                case 0x5:
+                case 0x6:
+                case 0x7:
+                case 0x9:
+                case 0xa:
+                case 0xd:
+                case 0xe:
+                case 0xf:
+                        access_errorcf(fs, fp);
+                        return;
+                default:
+                        break;
+                }
+        }
+#endif /* CONFIG_COLDFIRE && CONFIG_MMU */
+
         switch (fp->ptregs.format) {
 #if defined (CONFIG_M68060)
         case 4:                         /* 68060 access error */