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[SPARC64]: Document the instruction checks we do in do_sparc64_fault().

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-03-28 13:32:24 -08:00
parent 6f25f3986a
commit 73c50a27a4
1 changed files with 5 additions and 1 deletions
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6
arch/sparc64/mm/fault.c
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@ -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.