811 //
 812 //   Low memory addresses
 813 //    +------------------------+
 814 //    |                        |\
 815 //    |  glibc guard page      | - usually 1 page
 816 //    |                        |/
 817 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
 818 //    |                        |\
 819 //    |      Normal Stack      | -
 820 //    |                        |/
 821 // P2 +------------------------+ Thread::stack_base()
 822 //
 823 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from
 824 //    pthread_attr_getstack()
 825 
 826 static void current_stack_region(address * bottom, size_t * size) {
 827 #ifdef __APPLE__
 828   pthread_t self = pthread_self();
 829   void *stacktop = pthread_get_stackaddr_np(self);
 830   *size = pthread_get_stacksize_np(self);








 831   *bottom = (address) stacktop - *size;
 832 #elif defined(__OpenBSD__)
 833   stack_t ss;
 834   int rslt = pthread_stackseg_np(pthread_self(), &ss);
 835 
 836   if (rslt != 0)
 837     fatal(err_msg("pthread_stackseg_np failed with err = %d", rslt));
 838 
 839   *bottom = (address)((char *)ss.ss_sp - ss.ss_size);
 840   *size   = ss.ss_size;
 841 #else
 842   pthread_attr_t attr;
 843 
 844   int rslt = pthread_attr_init(&attr);
 845 
 846   // JVM needs to know exact stack location, abort if it fails
 847   if (rslt != 0)
 848     fatal(err_msg("pthread_attr_init failed with err = %d", rslt));
 849 
 850   rslt = pthread_attr_get_np(pthread_self(), &attr);

 811 //
 812 //   Low memory addresses
 813 //    +------------------------+
 814 //    |                        |\
 815 //    |  glibc guard page      | - usually 1 page
 816 //    |                        |/
 817 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
 818 //    |                        |\
 819 //    |      Normal Stack      | -
 820 //    |                        |/
 821 // P2 +------------------------+ Thread::stack_base()
 822 //
 823 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from
 824 //    pthread_attr_getstack()
 825 
 826 static void current_stack_region(address * bottom, size_t * size) {
 827 #ifdef __APPLE__
 828   pthread_t self = pthread_self();
 829   void *stacktop = pthread_get_stackaddr_np(self);
 830   *size = pthread_get_stacksize_np(self);
 831   // workaround for 10.9 (Mavericks)
 832   // pthread_get_stacksize_np returns 128 pages even though the actual size is 2048 pages
 833   if (pthread_main_np() == 1) {
 834     #define DEFAULT_MAIN_THREAD_STACK_PAGES 2048
 835     if (*size < (DEFAULT_MAIN_THREAD_STACK_PAGES*(size_t)getpagesize())) {
 836       *size = (DEFAULT_MAIN_THREAD_STACK_PAGES*getpagesize());
 837     }
 838   }
 839   *bottom = (address) stacktop - *size;
 840 #elif defined(__OpenBSD__)
 841   stack_t ss;
 842   int rslt = pthread_stackseg_np(pthread_self(), &ss);
 843 
 844   if (rslt != 0)
 845     fatal(err_msg("pthread_stackseg_np failed with err = %d", rslt));
 846 
 847   *bottom = (address)((char *)ss.ss_sp - ss.ss_size);
 848   *size   = ss.ss_size;
 849 #else
 850   pthread_attr_t attr;
 851 
 852   int rslt = pthread_attr_init(&attr);
 853 
 854   // JVM needs to know exact stack location, abort if it fails
 855   if (rslt != 0)
 856     fatal(err_msg("pthread_attr_init failed with err = %d", rslt));
 857 
 858   rslt = pthread_attr_get_np(pthread_self(), &attr);