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authorDavid S. Miller <davem@sunset.davemloft.net>2006-03-28 13:32:24 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-31 23:03:35 -0800
commit73c50a27a453a5ed0d21ff23bd67c1dd6d864cb8 (patch)
tree7a9857e2ed5dee8e334efadd16c5939650f757be /arch/sparc64/mm/fault.c
parent6f25f3986af0353b0bdc220f79b89c997d0ceda4 (diff)
[SPARC64]: Document the instruction checks we do in do_sparc64_fault().
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/mm/fault.c')
-rw-r--r--arch/sparc64/mm/fault.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
index 0db2f7d9fab5..6e002aacb961 100644
--- a/arch/sparc64/mm/fault.c
+++ b/arch/sparc64/mm/fault.c
@@ -327,8 +327,12 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
insn = get_fault_insn(regs, 0);
if (!insn)
goto continue_fault;
+ /* All loads, stores and atomics have bits 30 and 31 both set
+ * in the instruction. Bit 21 is set in all stores, but we
+ * have to avoid prefetches which also have bit 21 set.
+ */
if ((insn & 0xc0200000) == 0xc0200000 &&
- (insn & 0x1780000) != 0x1680000) {
+ (insn & 0x01780000) != 0x01680000) {
/* Don't bother updating thread struct value,
* because update_mmu_cache only cares which tlb
* the access came from.