| /* |
| * Copyright (c) 1997, 2015, 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/codeCache.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 <ucontext.h> |
| |
| 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_ppc.hpp. |
| |
| address os::Aix::ucontext_get_pc(const ucontext_t * uc) { |
| return (address)uc->uc_mcontext.jmp_context.iar; |
| } |
| |
| intptr_t* os::Aix::ucontext_get_sp(const 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(const 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(const void* ucVoid, |
| intptr_t** ret_sp, intptr_t** ret_fp) { |
| |
| ExtendedPC epc; |
| const ucontext_t* uc = (const 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(const 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 = Thread::current_or_null_safe(); |
| |
| 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 && thread->on_local_stack(addr)) { |
| // 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_reserved_zone(addr)) { |
| thread->disable_stack_yellow_reserved_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(); |
| os::Aix::ucontext_set_pc(uc, 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(); |
| os::Aix::ucontext_set_pc(uc, 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); |
| os::Aix::ucontext_set_pc(uc, 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::report_and_die(t, sig, pc, info, ucVoid); |
| |
| 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 = 128*K; |
| |
| // 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 : 1 * M); |
| 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, const void *context) { |
| if (context == NULL) return; |
| |
| const ucontext_t* uc = (const 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, const void *context) { |
| if (context == NULL) return; |
| |
| ucontext_t *uc = (ucontext_t*)context; |
| |
| st->print_cr("Register to memory mapping:"); |
| st->cr(); |
| |
| st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.iar); |
| st->print("lr ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.lr); |
| st->print("sp ="); print_location(st, (intptr_t)os::Aix::ucontext_get_sp(uc)); |
| for (int i = 0; i < 32; i++) { |
| st->print("r%-2d=", i); |
| print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.gpr[i]); |
| } |
| |
| st->cr(); |
| } |
| |
| 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 |
| |
| int os::extra_bang_size_in_bytes() { |
| // PPC does not require the additional stack bang. |
| return 0; |
| } |
| |