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sh: Support thread fault code encoding.

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This provides a simple interface modelled after sparc64/m32r to encode
the error code in the upper byte of thread_info for finer-grained
handling in the page fault path.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2012-05-14 14:57:28 +09:00
parent f007688a50
commit 5a1dc78a38
3 changed files with 78 additions and 47 deletions
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11
arch/sh/kernel/cpu/sh3/entry.S
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@@ -2,7 +2,7 @@
* arch/sh/kernel/cpu/sh3/entry.S
*
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
* Copyright (C) 2003 - 2006 Paul Mundt
* Copyright (C) 2003 - 2012 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@@ -17,6 +17,7 @@
#include <cpu/mmu_context.h>
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
! NOTE:
! GNU as (as of 2.9.1) changes bf/s into bt/s and bra, when the address
@@ -114,22 +115,22 @@ ENTRY(tlb_miss_load)
.align 2
ENTRY(tlb_miss_store)
bra call_handle_tlbmiss
mov #1, r5
mov #FAULT_CODE_WRITE, r5
.align 2
ENTRY(initial_page_write)
bra call_handle_tlbmiss
mov #2, r5
mov #FAULT_CODE_INITIAL, r5
.align 2
ENTRY(tlb_protection_violation_load)
bra call_do_page_fault
mov #0, r5
mov #FAULT_CODE_PROT, r5
.align 2
ENTRY(tlb_protection_violation_store)
bra call_do_page_fault
mov #1, r5
mov #(FAULT_CODE_PROT | FAULT_CODE_WRITE), r5
call_handle_tlbmiss:
mov.l 1f, r0