From: Paul Mundt <lethal@linux-sh.org>
Date: Mon, 14 May 2012 06:07:52 +0000 (+0900)
Subject: sh64: Utilize thread fault code encoding.
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=9a7b7739f9dba4014fc93531e4c2b6efac41b0a7;p=openwrt%2Fstaging%2Fblogic.git

sh64: Utilize thread fault code encoding.

This plugs in fault code encoding for the sh64 page fault, too.

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

diff --git a/arch/sh/kernel/cpu/sh5/entry.S b/arch/sh/kernel/cpu/sh5/entry.S
index 6b80295dd7a4..de60dc8d737d 100644
--- a/arch/sh/kernel/cpu/sh5/entry.S
+++ b/arch/sh/kernel/cpu/sh5/entry.S
@@ -1079,9 +1079,8 @@ restore_all:
  *
  * Kernel TLB fault handlers will get a slightly different interface.
  * (r2)   struct pt_regs *, original register's frame pointer
- * (r3)   writeaccess, whether it's a store fault as opposed to load fault
- * (r4)   execaccess, whether it's a ITLB fault as opposed to DTLB fault
- * (r5)   Effective Address of fault
+ * (r3)   page fault error code (see asm/thread_info.h)
+ * (r4)   Effective Address of fault
  * (LINK) return address
  * (SP)   = r2
  *
@@ -1092,26 +1091,25 @@ restore_all:
 tlb_miss_load:
 	or	SP, ZERO, r2
 	or	ZERO, ZERO, r3		/* Read */
-	or	ZERO, ZERO, r4		/* Data */
-	getcon	TEA, r5
+	getcon	TEA, r4
 	pta	call_do_page_fault, tr0
 	beq	ZERO, ZERO, tr0
 
 tlb_miss_store:
 	or	SP, ZERO, r2
-	movi	1, r3			/* Write */
-	or	ZERO, ZERO, r4		/* Data */
-	getcon	TEA, r5
+	movi	FAULT_CODE_WRITE, r3		/* Write */
+	getcon	TEA, r4
 	pta	call_do_page_fault, tr0
 	beq	ZERO, ZERO, tr0
 
 itlb_miss_or_IRQ:
 	pta	its_IRQ, tr0
 	beqi/u	r4, EVENT_INTERRUPT, tr0
+
+	/* ITLB miss */
 	or	SP, ZERO, r2
-	or	ZERO, ZERO, r3		/* Read */
-	movi	1, r4			/* Text */
-	getcon	TEA, r5
+	movi	FAULT_CODE_ITLB, r3
+	getcon	TEA, r4
 	/* Fall through */
 
 call_do_page_fault:
diff --git a/arch/sh/mm/tlbflush_64.c b/arch/sh/mm/tlbflush_64.c
index be01f92f8c89..99c5833036be 100644
--- a/arch/sh/mm/tlbflush_64.c
+++ b/arch/sh/mm/tlbflush_64.c
@@ -61,15 +61,17 @@ static pte_t *lookup_pte(struct mm_struct *mm, unsigned long address)
  * and the problem, and then passes it off to one of the appropriate
  * routines.
  */
-asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
-			      unsigned long textaccess, unsigned long address)
+asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
+			      unsigned long address)
 {
 	struct task_struct *tsk;
 	struct mm_struct *mm;
 	struct vm_area_struct * vma;
 	const struct exception_table_entry *fixup;
+	int write = error_code & FAULT_CODE_WRITE;
+	int textaccess = error_code & FAULT_CODE_ITLB;
 	unsigned int flags = (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
-			      (writeaccess ? FAULT_FLAG_WRITE : 0));
+			      (write ? FAULT_FLAG_WRITE : 0));
 	pte_t *pte;
 	int fault;
 
@@ -122,7 +124,7 @@ good_area:
 		if (!(vma->vm_flags & VM_EXEC))
 			goto bad_area;
 	} else {
-		if (writeaccess) {
+		if (write) {
 			if (!(vma->vm_flags & VM_WRITE))
 				goto bad_area;
 		} else {
@@ -239,7 +241,7 @@ no_context:
 		printk(KERN_ALERT "Unable to handle kernel paging request");
 	printk(" at virtual address %08lx\n", address);
 	printk(KERN_ALERT "pc = %08Lx%08Lx\n", regs->pc >> 32, regs->pc & 0xffffffff);
-	die("Oops", regs, writeaccess);
+	die("Oops", regs, error_code);
 	do_exit(SIGKILL);
 
 /*