--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp	Fri Sep 06 20:16:09 2013 +0200
@@ -0,0 +1,560 @@
+/*
+ * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2012, 2013 SAP AG. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+// no precompiled headers
+#include "assembler_ppc.inline.hpp"
+#include "classfile/classLoader.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/vmSymbols.hpp"
+#include "code/icBuffer.hpp"
+#include "code/vtableStubs.hpp"
+#include "interpreter/interpreter.hpp"
+#include "jvm_aix.h"
+#include "memory/allocation.inline.hpp"
+#include "mutex_aix.inline.hpp"
+#include "nativeInst_ppc.hpp"
+#include "os_share_aix.hpp"
+#include "prims/jniFastGetField.hpp"
+#include "prims/jvm.h"
+#include "prims/jvm_misc.hpp"
+#include "runtime/arguments.hpp"
+#include "runtime/extendedPC.hpp"
+#include "runtime/frame.inline.hpp"
+#include "runtime/interfaceSupport.hpp"
+#include "runtime/java.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/osThread.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "runtime/stubRoutines.hpp"
+#include "runtime/timer.hpp"
+#include "thread_aix.inline.hpp"
+#include "utilities/events.hpp"
+#include "utilities/vmError.hpp"
+#ifdef COMPILER1
+#include "c1/c1_Runtime1.hpp"
+#endif
+#ifdef COMPILER2
+#include "opto/runtime.hpp"
+#endif
+
+// put OS-includes here
+# include <ucontext.h>
+
+address os::current_stack_pointer() {
+  address csp;
+
+#if !defined(USE_XLC_BUILTINS)
+  // inline assembly for `ppc_mr regno(csp), PPC_SP':
+  __asm__ __volatile__ ("mr %0, 1":"=r"(csp):);
+#else
+  csp = (address) __builtin_frame_address(0);
+#endif
+
+  return csp;
+}
+
+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).
+
+  return (char*) -1;
+}
+
+// OS specific thread initialization
+//
+// Calculate and store the limits of the memory stack.
+void os::initialize_thread(Thread *thread) { }
+
+// Frame information (pc, sp, fp) retrieved via ucontext
+// always looks like a C-frame according to the frame
+// conventions in frame_ppc64.hpp.
+address os::Aix::ucontext_get_pc(ucontext_t * uc) {
+  return (address)uc->uc_mcontext.jmp_context.iar;
+}
+
+intptr_t* os::Aix::ucontext_get_sp(ucontext_t * uc) {
+  // gpr1 holds the stack pointer on aix
+  return (intptr_t*)uc->uc_mcontext.jmp_context.gpr[1/*REG_SP*/];
+}
+
+intptr_t* os::Aix::ucontext_get_fp(ucontext_t * uc) {
+  return NULL;
+}
+
+void os::Aix::ucontext_set_pc(ucontext_t* uc, address new_pc) {
+  uc->uc_mcontext.jmp_context.iar = (uint64_t) new_pc;
+}
+
+ExtendedPC os::fetch_frame_from_context(void* ucVoid,
+                                        intptr_t** ret_sp, intptr_t** ret_fp) {
+
+  ExtendedPC  epc;
+  ucontext_t* uc = (ucontext_t*)ucVoid;
+
+  if (uc != NULL) {
+    epc = ExtendedPC(os::Aix::ucontext_get_pc(uc));
+    if (ret_sp) *ret_sp = os::Aix::ucontext_get_sp(uc);
+    if (ret_fp) *ret_fp = os::Aix::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);
+  // Avoid crash during crash if pc broken.
+  if (epc.pc()) {
+    frame fr(sp, epc.pc());
+    return fr;
+  }
+  frame fr(sp);
+  return fr;
+}
+
+frame os::get_sender_for_C_frame(frame* fr) {
+  if (*fr->sp() == NULL) {
+    // fr is the last C frame
+    return frame(NULL, NULL);
+  }
+  return frame(fr->sender_sp(), fr->sender_pc());
+}
+
+
+frame os::current_frame() {
+  intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer());
+  // hack.
+  frame topframe(csp, (address)0x8);
+  // return sender of current topframe which hopefully has pc != NULL.
+  return os::get_sender_for_C_frame(&topframe);
+}
+
+// Utility functions
+
+extern "C" JNIEXPORT int
+JVM_handle_aix_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
+
+  ucontext_t* uc = (ucontext_t*) ucVoid;
+
+  Thread* t = ThreadLocalStorage::get_thread_slow();   // slow & steady
+
+  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_aix_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) {
+    if (os::Aix::chained_handler(sig, info, ucVoid)) {
+      return 1;
+    } else {
+      if (PrintMiscellaneous && (WizardMode || Verbose)) {
+        warning("Ignoring SIGPIPE - see bug 4229104");
+      }
+      return 1;
+    }
+  }
+
+  JavaThread* thread = NULL;
+  VMThread* vmthread = NULL;
+  if (os::Aix::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;
+
+  // retrieve program counter
+  address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL;
+
+  // retrieve crash address
+  address const addr = info ? (const address) info->si_addr : NULL;
+
+  // SafeFetch 32 handling:
+  // - make it work if _thread is null
+  // - make it use the standard os::...::ucontext_get/set_pc APIs
+  if (uc) {
+    address const pc = os::Aix::ucontext_get_pc(uc);
+    if (pc && StubRoutines::is_safefetch_fault(pc)) {
+      os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
+      return true;
+    }
+  }
+
+  // Handle SIGDANGER right away. AIX would raise SIGDANGER whenever available swap
+  // space falls below 30%. This is only a chance for the process to gracefully abort.
+  // We can't hope to proceed after SIGDANGER since SIGKILL tailgates.
+  if (sig == SIGDANGER) {
+    goto report_and_die;
+  }
+
+  if (info == NULL || uc == NULL || thread == NULL && vmthread == NULL) {
+    goto run_chained_handler;
+  }
+
+  // If we are a java thread...
+  if (thread != NULL) {
+
+    // Handle ALL stack overflow variations here
+    if (sig == SIGSEGV && (addr < thread->stack_base() &&
+                           addr >= thread->stack_base() - thread->stack_size())) {
+      // stack overflow
+      //
+      // If we are in a yellow zone and we are inside java, we disable the yellow zone and
+      // throw a stack overflow exception.
+      // If we are in native code or VM C code, we report-and-die. The original coding tried
+      // to continue with yellow zone disabled, but that doesn't buy us much and prevents
+      // hs_err_pid files.
+      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);
+          goto run_stub;
+        } else {
+          // Thread was in the vm or native code. Return and try to finish.
+          return 1;
+        }
+      } 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.");
+        goto report_and_die;
+      } else {
+        // this means a segv happened inside our stack, but not in
+        // the guarded zone. I'd like to know when this happens,
+        tty->print_raw_cr("SIGSEGV happened inside stack but outside yellow and red zone.");
+        goto report_and_die;
+      }
+
+    } // end handle SIGSEGV inside stack boundaries
+
+    if (thread->thread_state() == _thread_in_Java) {
+      // Java thread running in Java code
+
+      // The following signals are used for communicating VM events:
+      //
+      // SIGILL: the compiler generates illegal opcodes
+      //   at places where it wishes to interrupt the VM:
+      //   Safepoints, Unreachable Code, Entry points of Zombie methods,
+      //    This results in a SIGILL with (*pc) == inserted illegal instruction.
+      //
+      //   (so, SIGILLs with a pc inside the zero page are real errors)
+      //
+      // SIGTRAP:
+      //   The ppc trap instruction raises a SIGTRAP and is very efficient if it
+      //   does not trap. It is used for conditional branches that are expected
+      //   to be never taken. These are:
+      //     - zombie methods
+      //     - IC (inline cache) misses.
+      //     - null checks leading to UncommonTraps.
+      //     - range checks leading to Uncommon Traps.
+      //   On Aix, these are especially null checks, as the ImplicitNullCheck
+      //   optimization works only in rare cases, as the page at address 0 is only
+      //   write protected.      //
+      //   Note: !UseSIGTRAP is used to prevent SIGTRAPS altogether, to facilitate debugging.
+      //
+      // SIGSEGV:
+      //   used for safe point polling:
+      //     To notify all threads that they have to reach a safe point, safe point polling is used:
+      //     All threads poll a certain mapped memory page. Normally, this page has read access.
+      //     If the VM wants to inform the threads about impending safe points, it puts this
+      //     page to read only ("poisens" the page), and the threads then reach a safe point.
+      //   used for null checks:
+      //     If the compiler finds a store it uses it for a null check. Unfortunately this
+      //     happens rarely.  In heap based and disjoint base compressd oop modes also loads
+      //     are used for null checks.
+
+      // A VM-related SIGILL may only occur if we are not in the zero page.
+      // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else
+      // in the zero page, because it is filled with 0x0. We ignore
+      // explicit SIGILLs in the zero page.
+      if (sig == SIGILL && (pc < (address) 0x200)) {
+        if (TraceTraps)
+          tty->print_raw_cr("SIGILL happened inside zero page.");
+        goto report_and_die;
+      }
+
+      // Handle signal from NativeJump::patch_verified_entry().
+      if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) ||
+          (!TrapBasedNotEntrantChecks && sig == SIGILL  && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) {
+        if (TraceTraps)
+          tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");
+        stub = SharedRuntime::get_handle_wrong_method_stub();
+        goto run_stub;
+      }
+
+      else if (sig == SIGSEGV && os::is_poll_address(addr)) {
+        if (TraceTraps)
+          tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", pc);
+        stub = SharedRuntime::get_poll_stub(pc);
+        goto run_stub;
+      }
+
+      // SIGTRAP-based ic miss check in compiled code
+      else if (sig == SIGTRAP && TrapBasedICMissChecks &&
+               nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) {
+        if (TraceTraps)
+          tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
+        stub = SharedRuntime::get_ic_miss_stub();
+        goto run_stub;
+      }
+
+#ifdef COMPILER2
+      // SIGTRAP-based implicit null check in compiled code.
+      else if (sig == SIGTRAP && TrapBasedNullChecks &&
+               nativeInstruction_at(pc)->is_sigtrap_null_check()) {
+        if (TraceTraps)
+          tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
+        stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
+        goto run_stub;
+      }
+#endif
+
+      // SIGSEGV-based implicit null check in compiled code.
+      else if (sig == SIGSEGV && ImplicitNullChecks &&
+               CodeCache::contains((void*) pc) &&
+               !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) {
+        if (TraceTraps)
+          tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc);
+        stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
+      }
+
+#ifdef COMPILER2
+      // SIGTRAP-based implicit range check in compiled code.
+      else if (sig == SIGTRAP && TrapBasedRangeChecks &&
+               nativeInstruction_at(pc)->is_sigtrap_range_check()) {
+        if (TraceTraps)
+          tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
+        stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
+        goto run_stub;
+      }
+#endif
+
+      else if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) {
+        if (TraceTraps) {
+          tty->print_raw_cr("Fix SIGFPE handler, trying divide by zero handler.");
+        }
+        stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
+        goto run_stub;
+      }
+
+      else if (sig == SIGBUS) {
+        // 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()) {
+          // We don't really need a stub here! Just set the pending exeption and
+          // continue at the next instruction after the faulting read. Returning
+          // garbage from this read is ok.
+          thread->set_pending_unsafe_access_error();
+          uc->uc_mcontext.jmp_context.iar = ((unsigned long)pc) + 4;
+          return 1;
+        }
+      }
+    }
+
+    else { // thread->thread_state() != _thread_in_Java
+      // Detect CPU features. This is only done at the very start of the VM. Later, the
+      // VM_Version::is_determine_features_test_running() flag should be false.
+
+      if (sig == SIGILL && VM_Version::is_determine_features_test_running()) {
+        // SIGILL must be caused by VM_Version::determine_features().
+        *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL,
+                        // flushing of icache is not necessary.
+        stub = pc + 4;  // continue with next instruction.
+        goto run_stub;
+      }
+      else if (thread->thread_state() == _thread_in_vm &&
+               sig == SIGBUS && thread->doing_unsafe_access()) {
+        // We don't really need a stub here! Just set the pending exeption and
+        // continue at the next instruction after the faulting read. Returning
+        // garbage from this read is ok.
+        thread->set_pending_unsafe_access_error();
+        uc->uc_mcontext.jmp_context.iar = ((unsigned long)pc) + 4;
+        return 1;
+      }
+    }
+
+    // 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) &&
+        os::is_memory_serialize_page(thread, addr)) {
+      // Synchronization problem in the pseudo memory barrier code (bug id 6546278)
+      // Block current thread until the memory serialize page permission restored.
+      os::block_on_serialize_page_trap();
+      return true;
+    }
+  }
+
+run_stub:
+
+  // One of the above code blocks ininitalized the stub, so we want to
+  // delegate control to that stub.
+  if (stub != NULL) {
+    // Save all thread context in case we need to restore it.
+    if (thread != NULL) thread->set_saved_exception_pc(pc);
+    uc->uc_mcontext.jmp_context.iar = (unsigned long)stub;
+    return 1;
+  }
+
+run_chained_handler:
+
+  // signal-chaining
+  if (os::Aix::chained_handler(sig, info, ucVoid)) {
+    return 1;
+  }
+  if (!abort_if_unrecognized) {
+    // caller wants another chance, so give it to him
+    return 0;
+  }
+
+report_and_die:
+
+  // Use sigthreadmask instead of sigprocmask on AIX and unmask current signal.
+  sigset_t newset;
+  sigemptyset(&newset);
+  sigaddset(&newset, sig);
+  sigthreadmask(SIG_UNBLOCK, &newset, NULL);
+
+  VMError err(t, sig, pc, info, ucVoid);
+  err.report_and_die();
+
+  ShouldNotReachHere();
+  return 0;
+}
+
+void os::Aix::init_thread_fpu_state(void) {
+#if !defined(USE_XLC_BUILTINS)
+  // Disable FP exceptions.
+  __asm__ __volatile__ ("mtfsfi 6,0");
+#else
+  __mtfsfi(6, 0);
+#endif
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// thread stack
+
+size_t os::Aix::min_stack_allowed = 768*K;
+
+// Aix is always in floating stack mode. The stack size for a new
+// thread can be set via pthread_attr_setstacksize().
+bool os::Aix::supports_variable_stack_size() { return true; }
+
+// return default stack size for thr_type
+size_t os::Aix::default_stack_size(os::ThreadType thr_type) {
+  // default stack size (compiler thread needs larger stack)
+  // Notice that the setting for compiler threads here have no impact
+  // because of the strange 'fallback logic' in os::create_thread().
+  // Better set CompilerThreadStackSize in globals_<os_cpu>.hpp if you want to
+  // specify a different stack size for compiler threads!
+  size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
+  return s;
+}
+
+size_t os::Aix::default_guard_size(os::ThreadType thr_type) {
+  return 2 * page_size();
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// helper functions for fatal error handler
+
+void os::print_context(outputStream *st, void *context) {
+  if (context == NULL) return;
+
+  ucontext_t* uc = (ucontext_t*)context;
+
+  st->print_cr("Registers:");
+  st->print("pc =" INTPTR_FORMAT "  ", uc->uc_mcontext.jmp_context.iar);
+  st->print("lr =" INTPTR_FORMAT "  ", uc->uc_mcontext.jmp_context.lr);
+  st->print("ctr=" INTPTR_FORMAT "  ", uc->uc_mcontext.jmp_context.ctr);
+  st->cr();
+  for (int i = 0; i < 32; i++) {
+    st->print("r%-2d=" INTPTR_FORMAT "  ", i, uc->uc_mcontext.jmp_context.gpr[i]);
+    if (i % 3 == 2) st->cr();
+  }
+  st->cr();
+  st->cr();
+
+  intptr_t *sp = (intptr_t *)os::Aix::ucontext_get_sp(uc);
+  st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
+  print_hex_dump(st, (address)sp, (address)(sp + 128), 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::Aix::ucontext_get_pc(uc);
+  st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
+  print_hex_dump(st, pc - 64, pc + 64, /*instrsize=*/4);
+  st->cr();
+
+  // Try to decode the instructions.
+  st->print_cr("Decoded instructions: (pc=" PTR_FORMAT ")", pc);
+  st->print("<TODO: PPC port - print_context>");
+  // TODO: PPC port Disassembler::decode(pc, 16, 16, st);
+  st->cr();
+}
+
+void os::print_register_info(outputStream *st, void *context) {
+  if (context == NULL) return;
+  st->print("Not ported - print_register_info\n");
+}
+
+extern "C" {
+  int SpinPause() {
+    return 0;
+  }
+}
+
+#ifndef PRODUCT
+void os::verify_stack_alignment() {
+  assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
+}
+#endif