1605 }
1606 void* loaded_library() { return _lib; }
1607 };
1608
1609 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1610 void * result = NULL;
1611 bool load_attempted = false;
1612
1613 // Check whether the library to load might change execution rights
1614 // of the stack. If they are changed, the protection of the stack
1615 // guard pages will be lost. We need a safepoint to fix this.
1616 //
1617 // See Linux man page execstack(8) for more info.
1618 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) {
1619 if (!ElfFile::specifies_noexecstack(filename)) {
1620 if (!is_init_completed()) {
1621 os::Linux::_stack_is_executable = true;
1622 // This is OK - No Java threads have been created yet, and hence no
1623 // stack guard pages to fix.
1624 //
1625 // This should happen only when you are building JDK7 using a very
1626 // old version of JDK6 (e.g., with JPRT) and running test_gamma.
1627 //
1628 // Dynamic loader will make all stacks executable after
1629 // this function returns, and will not do that again.
1630 assert(Threads::number_of_threads() == 0, "no Java threads should exist yet.");
1631 } else {
1632 warning("You have loaded library %s which might have disabled stack guard. "
1633 "The VM will try to fix the stack guard now.\n"
1634 "It's highly recommended that you fix the library with "
1635 "'execstack -c <libfile>', or link it with '-z noexecstack'.",
1636 filename);
1637
1638 assert(Thread::current()->is_Java_thread(), "must be Java thread");
1639 JavaThread *jt = JavaThread::current();
1640 if (jt->thread_state() != _thread_in_native) {
1641 // This happens when a compiler thread tries to load a hsdis-<arch>.so file
1642 // that requires ExecStack. Cannot enter safe point. Let's give up.
1643 warning("Unable to fix stack guard. Giving up.");
1644 } else {
1645 if (!LoadExecStackDllInVMThread) {
1646 // This is for the case where the DLL has an static
1647 // constructor function that executes JNI code. We cannot
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1605 }
1606 void* loaded_library() { return _lib; }
1607 };
1608
1609 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1610 void * result = NULL;
1611 bool load_attempted = false;
1612
1613 // Check whether the library to load might change execution rights
1614 // of the stack. If they are changed, the protection of the stack
1615 // guard pages will be lost. We need a safepoint to fix this.
1616 //
1617 // See Linux man page execstack(8) for more info.
1618 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) {
1619 if (!ElfFile::specifies_noexecstack(filename)) {
1620 if (!is_init_completed()) {
1621 os::Linux::_stack_is_executable = true;
1622 // This is OK - No Java threads have been created yet, and hence no
1623 // stack guard pages to fix.
1624 //
1625 // Dynamic loader will make all stacks executable after
1626 // this function returns, and will not do that again.
1627 assert(Threads::number_of_threads() == 0, "no Java threads should exist yet.");
1628 } else {
1629 warning("You have loaded library %s which might have disabled stack guard. "
1630 "The VM will try to fix the stack guard now.\n"
1631 "It's highly recommended that you fix the library with "
1632 "'execstack -c <libfile>', or link it with '-z noexecstack'.",
1633 filename);
1634
1635 assert(Thread::current()->is_Java_thread(), "must be Java thread");
1636 JavaThread *jt = JavaThread::current();
1637 if (jt->thread_state() != _thread_in_native) {
1638 // This happens when a compiler thread tries to load a hsdis-<arch>.so file
1639 // that requires ExecStack. Cannot enter safe point. Let's give up.
1640 warning("Unable to fix stack guard. Giving up.");
1641 } else {
1642 if (!LoadExecStackDllInVMThread) {
1643 // This is for the case where the DLL has an static
1644 // constructor function that executes JNI code. We cannot
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