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authorPaul Mundt <lethal@linux-sh.org>2009-08-15 02:49:40 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-08-15 02:49:40 +0900
commit112e58471de3431fbd03dee514777ad4a66a77b2 (patch)
treed1cb3238e18467479d876ebcc99e06c1885e2538 /arch/sh/kernel
parente7b8b7f16edc9b363573eadf2ab2683473626071 (diff)
sh: TLB protection violation exception optimizations.
This adds a bit of rework to have the TLB protection violations skip the TLB miss fastpath and go directly in to do_page_fault(), as these require slow path handling. Based on an earlier patch by SUGIOKA Toshinobu. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/cpu/sh3/entry.S30
1 files changed, 19 insertions, 11 deletions
diff --git a/arch/sh/kernel/cpu/sh3/entry.S b/arch/sh/kernel/cpu/sh3/entry.S
index 3cb531f233f..bbaf2bd118e 100644
--- a/arch/sh/kernel/cpu/sh3/entry.S
+++ b/arch/sh/kernel/cpu/sh3/entry.S
@@ -113,34 +113,33 @@ OFF_TRA = (16*4+6*4)
#if defined(CONFIG_MMU)
.align 2
ENTRY(tlb_miss_load)
- bra call_dpf
+ bra call_handle_tlbmiss
mov #0, r5
.align 2
ENTRY(tlb_miss_store)
- bra call_dpf
+ bra call_handle_tlbmiss
mov #1, r5
.align 2
ENTRY(initial_page_write)
- bra call_dpf
+ bra call_handle_tlbmiss
mov #1, r5
.align 2
ENTRY(tlb_protection_violation_load)
- bra call_dpf
+ bra call_do_page_fault
mov #0, r5
.align 2
ENTRY(tlb_protection_violation_store)
- bra call_dpf
+ bra call_do_page_fault
mov #1, r5
-call_dpf:
+call_handle_tlbmiss:
mov.l 1f, r0
mov r5, r8
mov.l @r0, r6
- mov r6, r9
mov.l 2f, r0
sts pr, r10
jsr @r0
@@ -151,16 +150,25 @@ call_dpf:
lds r10, pr
rts
nop
-0: mov.l 3f, r0
- mov r9, r6
+0:
mov r8, r5
+call_do_page_fault:
+ mov.l 1f, r0
+ mov.l @r0, r6
+
+ sti
+
+ mov.l 3f, r0
+ mov.l 4f, r1
+ mov r15, r4
jmp @r0
- mov r15, r4
+ lds r1, pr
.align 2
1: .long MMU_TEA
-2: .long __do_page_fault
+2: .long handle_tlbmiss
3: .long do_page_fault
+4: .long ret_from_exception
.align 2
ENTRY(address_error_load)