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>

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);
 }