jdk8-mips64-public/hotspot: src/os_cpu/aix_ppc/vm/os_aix

src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp@666e6ce3976c (annotated)

src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp

Fri, 06 Sep 2013 20:16:09 +0200

author: simonis
date: Fri, 06 Sep 2013 20:16:09 +0200
changeset 6465: 666e6ce3976c
child 6495: 67fa91961822
permissions: -rw-r--r--

8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
Reviewed-by: kvn

 /*
  * 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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp@666e6ce3976c (annotated)

src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp