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authorHirokazu Takata <takata@linux-m32r.org>2007-05-10 22:22:26 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-11 08:29:33 -0700
commit0d4f64681695b0e389f7121eb647b27c602990bc (patch)
tree73ba274b97da70c99cf553f22c93c9d85abc0b83 /arch/m32r/mm
parent43c09ce7927912c7867617cba0a265beea38a154 (diff)
m32r: fix tme_handler to check _PAGE_PRESENT bit
Fix the tlb-miss handler (tme_handler) to check _PAGE_PRESENT bit in order to handle file-mapped or swapped-out pages correctly. This patch is required to fix unexpected page errors for m32r. Signed-off-by: Hitoshi Yamamoto <hitoshiy@linux-m32r.org> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/m32r/mm')
-rw-r--r--arch/m32r/mm/mmu.S22
1 files changed, 13 insertions, 9 deletions
diff --git a/arch/m32r/mm/mmu.S b/arch/m32r/mm/mmu.S
index 8bb74b10dca..49a6d16a3d5 100644
--- a/arch/m32r/mm/mmu.S
+++ b/arch/m32r/mm/mmu.S
@@ -163,7 +163,8 @@ ENTRY(tme_handler)
; pte_data = (unsigned long)pte_val(*pte);
ld r2, @r3 ; r2: pte data
- or3 r2, r2, #2 ; _PAGE_PRESENT(=2)
+ and3 r3, r2, #2 ; _PAGE_PRESENT(=2) check
+ beqz r3, 3f
.fillinsn
5:
@@ -264,11 +265,8 @@ ENTRY(tme_handler)
;
and3 r1, r1, #0xeff
ldi r4, #611 ; _KERNPG_TABLE(=611)
- beq r1, r4, 4f ; !pmd_bad(*pmd) ?
- .fillinsn
-3:
- ldi r1, #0 ; r1: pte_data = 0
- bra 5f
+ bne r1, r4, 3f ; !pmd_bad(*pmd) ?
+
.fillinsn
4:
; pte = pte_offset(pmd, address);
@@ -282,8 +280,10 @@ ENTRY(tme_handler)
add r4, r3 ; r4: pte
; pte_data = (unsigned long)pte_val(*pte);
ld r1, @r4 ; r1: pte_data
- .fillinsn
+ and3 r3, r1, #2 ; _PAGE_PRESENT(=2) check
+ beqz r3, 3f
+ .fillinsn
;; set tlb
; r0: address, r1: pte_data, r2: entry
; r3,r4: (free)
@@ -295,8 +295,7 @@ ENTRY(tme_handler)
and3 r4, r4, #(MMU_CONTEXT_ASID_MASK)
or r3, r4
st r3, @r2
- or3 r4, r1, #2 ; _PAGE_PRESENT(=2)
- st r4, @(4,r2) ; set_tlb_data(entry, pte_data);
+ st r1, @(4,r2) ; set_tlb_data(entry, pte_data);
ld r4, @sp+
ld r3, @sp+
@@ -306,6 +305,11 @@ ENTRY(tme_handler)
ld sp, @sp+
rte
+ .fillinsn
+3:
+ ldi r1, #2 ; r1: pte_data = 0 | _PAGE_PRESENT(=2)
+ bra 5b
+
#else
#error unknown isa configuration
#endif