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8139864: Improve handling of stack protection zones

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Reviewed-by: stuefe, coleenp, fparain
This commit is contained in:
Goetz Lindenmaier 2015-12-20 10:37:23 -05:00
parent 8c13cfe16c
commit b5bca5cc1b
43 changed files with 314 additions and 228 deletions
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4
hotspot/src/cpu/x86/vm/macroAssembler_x86.cpp
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@ -1059,8 +1059,8 @@ void MacroAssembler::bang_stack_size(Register size, Register tmp) {
// touch it again. (It was touched as (tmp-pagesize) but then tmp
// was post-decremented.) Skip this address by starting at i=1, and
// touch a few more pages below. N.B. It is important to touch all
// the way down to and including i=StackShadowPages.
for (int i = 1; i < StackShadowPages; i++) {
// the way down including all pages in the shadow zone.
for (int i = 1; i < ((int)JavaThread::stack_shadow_zone_size() / os::vm_page_size()); i++) {
// this could be any sized move but this is can be a debugging crumb
// so the bigger the better.
movptr(Address(tmp, (-i*os::vm_page_size())), size );