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[SPARC64]: Fix _PAGE_EXEC handling.

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First of all, use the known _PAGE_EXEC_{4U,4V} value instead
of loading _PAGE_EXEC from memory.  We either know which one
to use by context, or we can code patch the test.

Next, we need to check executability of a PTE in the generic
TSB miss handler.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-03-01 22:42:18 -08:00
parent 92daa77e9a
commit 45f791eb0f
3 changed files with 15 additions and 8 deletions
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10
arch/sparc64/kernel/itlb_miss.S
View File

@ -9,18 +9,18 @@
cmp %g4, %g6 ! Compare TAG
/* ITLB ** ICACHE line 2: TSB compare and TLB load */
sethi %hi(PAGE_EXEC), %g4 ! Setup exec check
ldx [%g4 + %lo(PAGE_EXEC)], %g4
bne,pn %xcc, tsb_miss_itlb ! Miss
mov FAULT_CODE_ITLB, %g3
andcc %g5, %g4, %g0 ! Executable?
andcc %g5, _PAGE_EXEC_4U, %g0 ! Executable?
be,pn %xcc, tsb_do_fault
nop ! Delay slot, fill me
stxa %g5, [%g0] ASI_ITLB_DATA_IN ! Load TLB
retry ! Trap done
nop
/* ITLB ** ICACHE line 3: */
stxa %g5, [%g0] ASI_ITLB_DATA_IN ! Load TLB
retry ! Trap done
nop
nop
nop
nop
nop

4
arch/sparc64/kernel/sun4v_tlb_miss.S
View File

@ -58,11 +58,9 @@ sun4v_itlb_miss:
/* Load TSB tag/pte into %g2/%g3 and compare the tag. */
ldda [%g1] ASI_QUAD_LDD_PHYS_4V, %g2
cmp %g2, %g6
sethi %hi(PAGE_EXEC), %g7
ldx [%g7 + %lo(PAGE_EXEC)], %g7
bne,a,pn %xcc, tsb_miss_page_table_walk
mov FAULT_CODE_ITLB, %g3
andcc %g3, %g7, %g0
andcc %g3, _PAGE_EXEC_4V, %g0
be,a,pn %xcc, tsb_do_fault
mov FAULT_CODE_ITLB, %g3

9
arch/sparc64/kernel/tsb.S
View File

@ -103,6 +103,15 @@ tsb_dtlb_load:
mov %g5, %g3
tsb_itlb_load:
/* Executable bit must be set. */
661: andcc %g5, _PAGE_EXEC_4U, %g0
.section .sun4v_1insn_patch, "ax"
.word 661b
andcc %g5, _PAGE_EXEC_4V, %g0
.previous
be,pn %xcc, tsb_do_fault
nop
661: stxa %g5, [%g0] ASI_ITLB_DATA_IN
retry