src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp

rev 12363 : 8169373: Work around linux NPTL stack guard error.
Summary: Also skip libc guard page for compiler thread, merge similar code on linux platforms, and streamline libc guard page handling on linuxs390, linuxppc, aixppc.
Reviewed-by: dholmes, dcubed

*** 154,208 ****
  address os::current_stack_pointer() {
    register void *sp __asm__ ("sp");
    return (address)sp;
  }
  
- static void current_stack_region(address* bottom, size_t* size) {
-   if (os::Linux::is_initial_thread()) {
-     // initial thread needs special handling because pthread_getattr_np()
-     // may return bogus value.
-     *bottom = os::Linux::initial_thread_stack_bottom();
-     *size = os::Linux::initial_thread_stack_size();
-   } else {
-     pthread_attr_t attr;
- 
-     int rslt = pthread_getattr_np(pthread_self(), &attr);
- 
-     // JVM needs to know exact stack location, abort if it fails
-     if (rslt != 0) {
-       if (rslt == ENOMEM) {
-         vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np");
-       } else {
-         fatal("pthread_getattr_np failed with errno = %d", rslt);
-       }
-     }
- 
-     if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) {
-       fatal("Can not locate current stack attributes!");
-     }
- 
-     pthread_attr_destroy(&attr);
-   }
-   assert(os::current_stack_pointer() >= *bottom &&
-          os::current_stack_pointer() < *bottom + *size, "just checking");
- }
- 
- address os::current_stack_base() {
-   address bottom;
-   size_t size;
-   current_stack_region(&bottom, &size);
-   return bottom + size;
- }
- 
- size_t os::current_stack_size() {
-   // stack size includes normal stack and HotSpot guard pages
-   address bottom;
-   size_t size;
-   current_stack_region(&bottom, &size);
-   return size;
- }
- 
  char* os::non_memory_address_word() {
    // Must never look like an address returned by reserve_memory,
    // even in its subfields (as defined by the CPU immediate fields,
    // if the CPU splits constants across multiple instructions).
    // On SPARC, 0 != %hi(any real address), because there is no
--- 154,163 ----
*** 735,750 ****
    // default stack size (compiler thread needs larger stack)
    size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
    return s;
  }
  
- size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
-   // Creating guard page is very expensive. Java thread has HotSpot
-   // guard page, only enable glibc guard page for non-Java threads.
-   return (thr_type == java_thread ? 0 : page_size());
- }
- 
  #ifndef PRODUCT
  void os::verify_stack_alignment() {
  }
  #endif
  
--- 690,699 ----