--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp	Thu Apr 24 15:07:57 2008 -0400
@@ -0,0 +1,648 @@
+/*
+ * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// do not include  precompiled  header file
+
+#include "incls/_os_linux_sparc.cpp.incl"
+
+// Linux/Sparc has rather obscure naming of registers in sigcontext
+// different between 32 and 64 bits
+#ifdef _LP64
+#define SIG_PC(x) ((x)->sigc_regs.tpc)
+#define SIG_NPC(x) ((x)->sigc_regs.tnpc)
+#define SIG_REGS(x) ((x)->sigc_regs)
+#else
+#define SIG_PC(x) ((x)->si_regs.pc)
+#define SIG_NPC(x) ((x)->si_regs.npc)
+#define SIG_REGS(x) ((x)->si_regs)
+#endif
+
+// those are to reference registers in sigcontext
+enum {
+  CON_G0 = 0,
+  CON_G1,
+  CON_G2,
+  CON_G3,
+  CON_G4,
+  CON_G5,
+  CON_G6,
+  CON_G7,
+  CON_O0,
+  CON_O1,
+  CON_O2,
+  CON_O3,
+  CON_O4,
+  CON_O5,
+  CON_O6,
+  CON_O7,
+};
+
+static inline void set_cont_address(sigcontext* ctx, address addr) {
+  SIG_PC(ctx)  = (intptr_t)addr;
+  SIG_NPC(ctx) = (intptr_t)(addr+4);
+}
+
+// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
+// currently interrupted by SIGPROF.
+// os::Solaris::fetch_frame_from_ucontext() tries to skip nested
+// signal frames. Currently we don't do that on Linux, so it's the
+// same as os::fetch_frame_from_context().
+ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
+                                                ucontext_t* uc,
+                                                intptr_t** ret_sp,
+                                                intptr_t** ret_fp) {
+  assert(thread != NULL, "just checking");
+  assert(ret_sp != NULL, "just checking");
+  assert(ret_fp != NULL, "just checking");
+
+  return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
+}
+
+ExtendedPC os::fetch_frame_from_context(void* ucVoid,
+                                        intptr_t** ret_sp,
+                                        intptr_t** ret_fp) {
+  ucontext_t* uc = (ucontext_t*) ucVoid;
+  ExtendedPC  epc;
+
+  if (uc != NULL) {
+    epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
+    if (ret_sp) {
+      *ret_sp = os::Linux::ucontext_get_sp(uc);
+    }
+    if (ret_fp) {
+      *ret_fp = os::Linux::ucontext_get_fp(uc);
+    }
+  } else {
+    // construct empty ExtendedPC for return value checking
+    epc = ExtendedPC(NULL);
+    if (ret_sp) {
+      *ret_sp = (intptr_t*) NULL;
+    }
+    if (ret_fp) {
+      *ret_fp = (intptr_t*) NULL;
+    }
+  }
+
+  return epc;
+}
+
+frame os::fetch_frame_from_context(void* ucVoid) {
+  intptr_t* sp;
+  intptr_t* fp;
+  ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
+  return frame(sp, fp, epc.pc());
+}
+
+frame os::get_sender_for_C_frame(frame* fr) {
+  return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
+}
+
+frame os::current_frame() {
+  fprintf(stderr, "current_frame()");
+
+  intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
+  frame myframe(sp, frame::unpatchable,
+                CAST_FROM_FN_PTR(address, os::current_frame));
+  if (os::is_first_C_frame(&myframe)) {
+    // stack is not walkable
+    return frame(NULL, frame::unpatchable, NULL);
+  } else {
+    return os::get_sender_for_C_frame(&myframe);
+  }
+}
+
+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, "pthread_getattr_np");
+      } else {
+        fatal1("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
+  // allocation in the first 1Kb of the virtual address space.
+  return (char*) 0;
+}
+
+void os::initialize_thread() {}
+
+void os::print_context(outputStream *st, void *context) {
+  if (context == NULL) return;
+
+  ucontext_t* uc = (ucontext_t*)context;
+  sigcontext* sc = (sigcontext*)context;
+  st->print_cr("Registers:");
+
+  st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT
+               " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT,
+               SIG_REGS(sc).u_regs[CON_O0],
+               SIG_REGS(sc).u_regs[CON_O1],
+               SIG_REGS(sc).u_regs[CON_O2],
+               SIG_REGS(sc).u_regs[CON_O3]);
+  st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT
+               " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT,
+               SIG_REGS(sc).u_regs[CON_O4],
+               SIG_REGS(sc).u_regs[CON_O5],
+               SIG_REGS(sc).u_regs[CON_O6],
+               SIG_REGS(sc).u_regs[CON_O7]);
+
+  st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT
+               " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT,
+               SIG_REGS(sc).u_regs[CON_G1],
+               SIG_REGS(sc).u_regs[CON_G2],
+               SIG_REGS(sc).u_regs[CON_G3],
+               SIG_REGS(sc).u_regs[CON_G4]);
+  st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT
+               " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT,
+               SIG_REGS(sc).u_regs[CON_G5],
+               SIG_REGS(sc).u_regs[CON_G6],
+               SIG_REGS(sc).u_regs[CON_G7],
+               SIG_REGS(sc).y);
+
+  st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT,
+               SIG_PC(sc),
+               SIG_NPC(sc));
+  st->cr();
+  st->cr();
+
+  intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
+  st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
+  print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
+  st->cr();
+
+  // Note: it may be unsafe to inspect memory near pc. For example, pc may
+  // point to garbage if entry point in an nmethod is corrupted. Leave
+  // this at the end, and hope for the best.
+  address pc = os::Linux::ucontext_get_pc(uc);
+  st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
+  print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
+}
+
+
+address os::Linux::ucontext_get_pc(ucontext_t* uc) {
+  return (address) SIG_PC((sigcontext*)uc);
+}
+
+intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) {
+  return (intptr_t*)
+    ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS);
+}
+
+// not used on Sparc
+intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) {
+  ShouldNotReachHere();
+  return NULL;
+}
+
+// Utility functions
+
+extern "C" void Fetch32PFI();
+extern "C" void Fetch32Resume();
+extern "C" void FetchNPFI();
+extern "C" void FetchNResume();
+
+inline static bool checkPrefetch(sigcontext* uc, address pc) {
+  if (pc == (address) Fetch32PFI) {
+    set_cont_address(uc, address(Fetch32Resume));
+    return true;
+  }
+  if (pc == (address) FetchNPFI) {
+    set_cont_address(uc, address(FetchNResume));
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkOverflow(sigcontext* uc,
+                                 address pc,
+                                 address addr,
+                                 JavaThread* thread,
+                                 address* stub) {
+  // check if fault address is within thread stack
+  if (addr < thread->stack_base() &&
+      addr >= thread->stack_base() - thread->stack_size()) {
+    // stack overflow
+    if (thread->in_stack_yellow_zone(addr)) {
+      thread->disable_stack_yellow_zone();
+      if (thread->thread_state() == _thread_in_Java) {
+        // Throw a stack overflow exception.  Guard pages will be reenabled
+        // while unwinding the stack.
+        *stub =
+          SharedRuntime::continuation_for_implicit_exception(thread,
+                                                             pc,
+                                                             SharedRuntime::STACK_OVERFLOW);
+      } else {
+        // Thread was in the vm or native code.  Return and try to finish.
+        return true;
+      }
+    } else if (thread->in_stack_red_zone(addr)) {
+      // Fatal red zone violation.  Disable the guard pages and fall through
+      // to handle_unexpected_exception way down below.
+      thread->disable_stack_red_zone();
+      tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
+    } else {
+      // Accessing stack address below sp may cause SEGV if current
+      // thread has MAP_GROWSDOWN stack. This should only happen when
+      // current thread was created by user code with MAP_GROWSDOWN flag
+      // and then attached to VM. See notes in os_linux.cpp.
+      if (thread->osthread()->expanding_stack() == 0) {
+        thread->osthread()->set_expanding_stack();
+        if (os::Linux::manually_expand_stack(thread, addr)) {
+          thread->osthread()->clear_expanding_stack();
+          return true;
+        }
+        thread->osthread()->clear_expanding_stack();
+      } else {
+        fatal("recursive segv. expanding stack.");
+      }
+    }
+  }
+  return false;
+}
+
+inline static bool checkPollingPage(address pc, address fault, address* stub) {
+  if (fault == os::get_polling_page()) {
+    *stub = SharedRuntime::get_poll_stub(pc);
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkByteBuffer(address pc, address* stub) {
+  // BugId 4454115: A read from a MappedByteBuffer can fault
+  // here if the underlying file has been truncated.
+  // Do not crash the VM in such a case.
+  CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
+  nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
+  if (nm != NULL && nm->has_unsafe_access()) {
+    *stub = StubRoutines::handler_for_unsafe_access();
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkVerifyOops(address pc, address fault, address* stub) {
+  if (pc >= MacroAssembler::_verify_oop_implicit_branch[0]
+      && pc <  MacroAssembler::_verify_oop_implicit_branch[1] ) {
+    *stub     =  MacroAssembler::_verify_oop_implicit_branch[2];
+    warning("fixed up memory fault in +VerifyOops at address "
+            INTPTR_FORMAT, fault);
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkFPFault(address pc, int code,
+                                JavaThread* thread, address* stub) {
+  if (code == FPE_INTDIV || code == FPE_FLTDIV) {
+    *stub =
+      SharedRuntime::
+      continuation_for_implicit_exception(thread,
+                                          pc,
+                                          SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkNullPointer(address pc, intptr_t fault,
+                                    JavaThread* thread, address* stub) {
+  if (!MacroAssembler::needs_explicit_null_check(fault)) {
+    // Determination of interpreter/vtable stub/compiled code null
+    // exception
+    *stub =
+      SharedRuntime::
+      continuation_for_implicit_exception(thread, pc,
+                                          SharedRuntime::IMPLICIT_NULL);
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkFastJNIAccess(address pc, address* stub) {
+  address addr = JNI_FastGetField::find_slowcase_pc(pc);
+  if (addr != (address)-1) {
+    *stub = addr;
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkSerializePage(JavaThread* thread, address addr) {
+  return os::is_memory_serialize_page(thread, addr);
+}
+
+inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) {
+  if (nativeInstruction_at(*pc)->is_zombie()) {
+    // zombie method (ld [%g0],%o7 instruction)
+    *stub = SharedRuntime::get_handle_wrong_method_stub();
+
+    // At the stub it needs to look like a call from the caller of this
+    // method (not a call from the segv site).
+    *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
+    return true;
+  }
+  return false;
+}
+
+inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) {
+#ifdef COMPILER2
+  if (nativeInstruction_at(*pc)->is_ic_miss_trap()) {
+#ifdef ASSERT
+#ifdef TIERED
+    CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
+    assert(cb->is_compiled_by_c2(), "Wrong compiler");
+#endif // TIERED
+#endif // ASSERT
+    // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken.
+    *stub = SharedRuntime::get_ic_miss_stub();
+    // At the stub it needs to look like a call from the caller of this
+    // method (not a call from the segv site).
+    *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
+    return true;
+  }
+#endif  // COMPILER2
+  return false;
+}
+
+extern "C" int
+JVM_handle_linux_signal(int sig,
+                        siginfo_t* info,
+                        void* ucVoid,
+                        int abort_if_unrecognized) {
+  // in fact this isn't ucontext_t* at all, but struct sigcontext*
+  // but Linux porting layer uses ucontext_t, so to minimize code change
+  // we cast as needed
+  ucontext_t* ucFake = (ucontext_t*) ucVoid;
+  sigcontext* uc = (sigcontext*)ucVoid;
+
+  Thread* t = ThreadLocalStorage::get_thread_slow();
+
+  SignalHandlerMark shm(t);
+
+  // Note: it's not uncommon that JNI code uses signal/sigset to install
+  // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
+  // or have a SIGILL handler when detecting CPU type). When that happens,
+  // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
+  // avoid unnecessary crash when libjsig is not preloaded, try handle signals
+  // that do not require siginfo/ucontext first.
+
+  if (sig == SIGPIPE || sig == SIGXFSZ) {
+    // allow chained handler to go first
+    if (os::Linux::chained_handler(sig, info, ucVoid)) {
+      return true;
+    } else {
+      if (PrintMiscellaneous && (WizardMode || Verbose)) {
+        char buf[64];
+        warning("Ignoring %s - see bugs 4229104 or 646499219",
+                os::exception_name(sig, buf, sizeof(buf)));
+      }
+      return true;
+    }
+  }
+
+  JavaThread* thread = NULL;
+  VMThread* vmthread = NULL;
+  if (os::Linux::signal_handlers_are_installed) {
+    if (t != NULL ){
+      if(t->is_Java_thread()) {
+        thread = (JavaThread*)t;
+      }
+      else if(t->is_VM_thread()){
+        vmthread = (VMThread *)t;
+      }
+    }
+  }
+
+  // decide if this trap can be handled by a stub
+  address stub = NULL;
+  address pc = NULL;
+  address npc = NULL;
+
+  //%note os_trap_1
+  if (info != NULL && uc != NULL && thread != NULL) {
+    pc = address(SIG_PC(uc));
+    npc = address(SIG_NPC(uc));
+
+    // Check to see if we caught the safepoint code in the
+    // process of write protecting the memory serialization page.
+    // It write enables the page immediately after protecting it
+    // so we can just return to retry the write.
+    if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) {
+      // Block current thread until the memory serialize page permission restored.
+      os::block_on_serialize_page_trap();
+      return 1;
+    }
+
+    if (checkPrefetch(uc, pc)) {
+      return 1;
+    }
+
+    // Handle ALL stack overflow variations here
+    if (sig == SIGSEGV) {
+      if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) {
+        return 1;
+      }
+    }
+
+    if (sig == SIGBUS &&
+        thread->thread_state() == _thread_in_vm &&
+        thread->doing_unsafe_access()) {
+      stub = StubRoutines::handler_for_unsafe_access();
+    }
+
+    if (thread->thread_state() == _thread_in_Java) {
+      do {
+        // Java thread running in Java code => find exception handler if any
+        // a fault inside compiled code, the interpreter, or a stub
+
+        if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) {
+          break;
+        }
+
+        if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) {
+          break;
+        }
+
+        if ((sig == SIGSEGV || sig == SIGBUS) &&
+            checkVerifyOops(pc, (address)info->si_addr, &stub)) {
+          break;
+        }
+
+        if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) {
+          break;
+        }
+
+        if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) {
+          break;
+        }
+
+        if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) {
+          break;
+        }
+
+        if ((sig == SIGSEGV) &&
+            checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) {
+          break;
+        }
+      } while (0);
+
+      // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
+      // and the heap gets shrunk before the field access.
+      if ((sig == SIGSEGV) || (sig == SIGBUS)) {
+        checkFastJNIAccess(pc, &stub);
+      }
+    }
+
+    if (stub != NULL) {
+      // save all thread context in case we need to restore it
+      thread->set_saved_exception_pc(pc);
+      thread->set_saved_exception_npc(npc);
+      set_cont_address(uc, stub);
+      return true;
+    }
+  }
+
+  // signal-chaining
+  if (os::Linux::chained_handler(sig, info, ucVoid)) {
+    return true;
+  }
+
+  if (!abort_if_unrecognized) {
+    // caller wants another chance, so give it to him
+    return false;
+  }
+
+  if (pc == NULL && uc != NULL) {
+    pc = os::Linux::ucontext_get_pc((ucontext_t*)uc);
+  }
+
+  // unmask current signal
+  sigset_t newset;
+  sigemptyset(&newset);
+  sigaddset(&newset, sig);
+  sigprocmask(SIG_UNBLOCK, &newset, NULL);
+
+  VMError err(t, sig, pc, info, ucVoid);
+  err.report_and_die();
+
+  ShouldNotReachHere();
+}
+
+void os::Linux::init_thread_fpu_state(void) {
+  // Nothing to do
+}
+
+int os::Linux::get_fpu_control_word() {
+  return 0;
+}
+
+void os::Linux::set_fpu_control_word(int fpu) {
+  // nothing
+}
+
+bool os::is_allocatable(size_t bytes) {
+#ifdef _LP64
+  return true;
+#else
+  if (bytes < 2 * G) {
+    return true;
+  }
+
+  char* addr = reserve_memory(bytes, NULL);
+
+  if (addr != NULL) {
+    release_memory(addr, bytes);
+  }
+
+  return addr != NULL;
+#endif // _LP64
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// thread stack
+
+size_t os::Linux::min_stack_allowed  = 128 * K;
+
+// pthread on Ubuntu is always in floating stack mode
+bool os::Linux::supports_variable_stack_size() {  return true; }
+
+// return default stack size for thr_type
+size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
+  // 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());
+}