[SPARC64]: Fix _PAGE_EXEC handling.

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>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S
index cc225c0563c3..563852bf3594 100644
--- a/arch/sparc64/kernel/tsb.S
+++ b/arch/sparc64/kernel/tsb.S
@@ -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