truffle: src/os_cpu/aix_ppc/vm/os_aix

comparison src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp @ 14415:666e6ce3976c

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

author	simonis
date	Fri, 06 Sep 2013 20:16:09 +0200
parents
children	67fa91961822

comparison

equal deleted inserted replaced

-:b83f7d608548
+:666e6ce3976c
+/*
+* 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 > hg > truffle

comparison src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp @ 14415:666e6ce3976c