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src/hotspot/share/runtime/safepointMechanism.cpp
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rev 48405 : 8194258: PPC64 safepoint mechanism: Fix initialization on AIX and support SIGTRAP
Summary: Use mmap on AIX to allocate protected page. Use trap instructions for polling if UseSIGTRAP is enabled.
Reviewed-by:
*** 34,43 ****
--- 34,53 ----
void* SafepointMechanism::_poll_disarmed_value;
void SafepointMechanism::default_initialize() {
if (ThreadLocalHandshakes) {
set_uses_thread_local_poll();
+
+ // Poll bit values
+ intptr_t poll_armed_value = poll_bit();
+ intptr_t poll_disarmed_value = 0;
+
+ #ifdef USE_POLL_BIT_ONLY
+ if (!USE_POLL_BIT_ONLY)
+ #endif
+ {
+ // Polling page
const size_t page_size = os::vm_page_size();
const size_t allocation_size = 2 * page_size;
char* polling_page = os::reserve_memory(allocation_size, NULL, page_size);
os::commit_memory_or_exit(polling_page, allocation_size, false, "Unable to commit Safepoint polling page");
*** 48,60 ****
os::protect_memory(good_page, page_size, os::MEM_PROT_READ);
log_info(os)("SafePoint Polling address, bad (protected) page:" INTPTR_FORMAT ", good (unprotected) page:" INTPTR_FORMAT, p2i(bad_page), p2i(good_page));
os::set_polling_page((address)(bad_page));
! intptr_t poll_page_val = reinterpret_cast<intptr_t>(bad_page);
! _poll_armed_value = reinterpret_cast<void*>(poll_page_val | poll_bit());
! _poll_disarmed_value = good_page;
} else {
const size_t page_size = os::vm_page_size();
char* polling_page = os::reserve_memory(page_size, NULL, page_size);
os::commit_memory_or_exit(polling_page, page_size, false, "Unable to commit Safepoint polling page");
os::protect_memory(polling_page, page_size, os::MEM_PROT_READ);
--- 58,76 ----
os::protect_memory(good_page, page_size, os::MEM_PROT_READ);
log_info(os)("SafePoint Polling address, bad (protected) page:" INTPTR_FORMAT ", good (unprotected) page:" INTPTR_FORMAT, p2i(bad_page), p2i(good_page));
os::set_polling_page((address)(bad_page));
! // Poll address values
! intptr_t bad_page_val = reinterpret_cast<intptr_t>(bad_page),
! good_page_val = reinterpret_cast<intptr_t>(good_page);
! poll_armed_value |= bad_page_val;
! poll_disarmed_value |= good_page_val;
! }
!
! _poll_armed_value = reinterpret_cast<void*>(poll_armed_value);
! _poll_disarmed_value = reinterpret_cast<void*>(poll_disarmed_value);
} else {
const size_t page_size = os::vm_page_size();
char* polling_page = os::reserve_memory(page_size, NULL, page_size);
os::commit_memory_or_exit(polling_page, page_size, false, "Unable to commit Safepoint polling page");
os::protect_memory(polling_page, page_size, os::MEM_PROT_READ);
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