diff -r 000000000000 -r f90c822e73f8 src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp Wed Apr 27 01:25:04 2016 +0800 @@ -0,0 +1,565 @@ +/* + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. + * Copyright 2012, 2014 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/thread.inline.hpp" +#include "runtime/timer.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 + +address os::current_stack_pointer() { + address csp; + +#if !defined(USE_XLC_BUILTINS) + // inline assembly for `mr regno(csp), R1_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; + } + + // 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; + } + + // 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_.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 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