sh64: Set additional fault code values.

The SSR.MD status amongst other things are already made available, which
can be used for encoding a more precise fault code value.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/mm/tlbex_64.c b/arch/sh/mm/tlbex_64.c
index 24dd4ab33dec7debd6bf7fa96904cf97d9199b9b..8557548fc53eea25b4b84f0237615b1a96858f1c 100644 (file)
--- a/arch/sh/mm/tlbex_64.c
+++ b/arch/sh/mm/tlbex_64.c
@@ -108,6 +108,17 @@ static struct expevt_lookup expevt_lookup_table = {
        .is_text_access   = {1,   1,   0, 0, 0,   0,   0,   0}
 };
 
+static inline unsigned int
+expevt_to_fault_code(unsigned long expevt)
+{
+       if (expevt == 0xa40)
+               return FAULT_CODE_ITLB;
+       else if (expevt == 0x060)
+               return FAULT_CODE_WRITE;
+
+       return 0;
+}
+
 /*
    This routine handles page faults that can be serviced just by refilling a
    TLB entry from an existing page table entry.  (This case represents a very
@@ -123,6 +134,7 @@ do_fast_page_fault(unsigned long long ssr_md, unsigned long long expevt,
        unsigned long long protection_flags;
        unsigned long long index;
        unsigned long long expevt4;
+       unsigned int fault_code;
 
        /* The next few lines implement a way of hashing EXPEVT into a
         * small array index which can be used to lookup parameters
@@ -139,10 +151,16 @@ do_fast_page_fault(unsigned long long ssr_md, unsigned long long expevt,
        index = expevt4 ^ (expevt4 >> 5);
        index &= 7;
 
+       fault_code = expevt_to_fault_code(expevt);
+
        protection_flags = expevt_lookup_table.protection_flags[index];
 
        if (expevt_lookup_table.is_text_access[index])
-               set_thread_fault_code(FAULT_CODE_ITLB);
+               fault_code |= FAULT_CODE_ITLB;
+       if (!ssr_md)
+               fault_code |= FAULT_CODE_USER;
+
+       set_thread_fault_code(fault_code);
 
        return handle_tlbmiss(protection_flags, address);
 }