617 lines
23 KiB
C++
617 lines
23 KiB
C++
/*
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* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2016 SAP SE. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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// no precompiled headers
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#include "asm/assembler.inline.hpp"
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#include "classfile/classLoader.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/codeCache.hpp"
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#include "code/icBuffer.hpp"
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#include "code/vtableStubs.hpp"
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#include "interpreter/interpreter.hpp"
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#include "jvm_linux.h"
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#include "memory/allocation.inline.hpp"
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#include "nativeInst_ppc.hpp"
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#include "os_share_linux.hpp"
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#include "prims/jniFastGetField.hpp"
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#include "prims/jvm.h"
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#include "prims/jvm_misc.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/extendedPC.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/stubRoutines.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/timer.hpp"
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#include "utilities/events.hpp"
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#include "utilities/vmError.hpp"
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// put OS-includes here
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# include <sys/types.h>
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# include <sys/mman.h>
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# include <pthread.h>
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# include <signal.h>
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# include <errno.h>
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# include <dlfcn.h>
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# include <stdlib.h>
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# include <stdio.h>
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# include <unistd.h>
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# include <sys/resource.h>
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# include <pthread.h>
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# include <sys/stat.h>
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# include <sys/time.h>
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# include <sys/utsname.h>
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# include <sys/socket.h>
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# include <sys/wait.h>
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# include <pwd.h>
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# include <poll.h>
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# include <ucontext.h>
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address os::current_stack_pointer() {
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intptr_t* csp;
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// inline assembly `mr regno(csp), R1_SP':
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__asm__ __volatile__ ("mr %0, 1":"=r"(csp):);
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return (address) csp;
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}
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char* os::non_memory_address_word() {
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// Must never look like an address returned by reserve_memory,
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// even in its subfields (as defined by the CPU immediate fields,
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// if the CPU splits constants across multiple instructions).
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return (char*) -1;
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}
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void os::initialize_thread(Thread *thread) { }
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// Frame information (pc, sp, fp) retrieved via ucontext
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// always looks like a C-frame according to the frame
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// conventions in frame_ppc64.hpp.
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address os::Linux::ucontext_get_pc(const ucontext_t * uc) {
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// On powerpc64, ucontext_t is not selfcontained but contains
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// a pointer to an optional substructure (mcontext_t.regs) containing the volatile
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// registers - NIP, among others.
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// This substructure may or may not be there depending where uc came from:
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// - if uc was handed over as the argument to a sigaction handler, a pointer to the
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// substructure was provided by the kernel when calling the signal handler, and
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// regs->nip can be accessed.
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// - if uc was filled by getcontext(), it is undefined - getcontext() does not fill
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// it because the volatile registers are not needed to make setcontext() work.
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// Hopefully it was zero'd out beforehand.
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guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_get_pc in sigaction context");
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return (address)uc->uc_mcontext.regs->nip;
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}
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// modify PC in ucontext.
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// Note: Only use this for an ucontext handed down to a signal handler. See comment
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// in ucontext_get_pc.
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void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
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guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_set_pc in sigaction context");
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uc->uc_mcontext.regs->nip = (unsigned long)pc;
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}
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intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {
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return (intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/];
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}
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intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {
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return NULL;
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}
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ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
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intptr_t** ret_sp, intptr_t** ret_fp) {
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ExtendedPC epc;
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const ucontext_t* uc = (const ucontext_t*)ucVoid;
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if (uc != NULL) {
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epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
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if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc);
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if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc);
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} else {
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// construct empty ExtendedPC for return value checking
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epc = ExtendedPC(NULL);
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if (ret_sp) *ret_sp = (intptr_t *)NULL;
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if (ret_fp) *ret_fp = (intptr_t *)NULL;
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}
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return epc;
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}
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frame os::fetch_frame_from_context(const void* ucVoid) {
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intptr_t* sp;
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intptr_t* fp;
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ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
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return frame(sp, epc.pc());
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}
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bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
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address pc = (address) os::Linux::ucontext_get_pc(uc);
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if (Interpreter::contains(pc)) {
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// Interpreter performs stack banging after the fixed frame header has
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// been generated while the compilers perform it before. To maintain
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// semantic consistency between interpreted and compiled frames, the
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// method returns the Java sender of the current frame.
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*fr = os::fetch_frame_from_context(uc);
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if (!fr->is_first_java_frame()) {
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assert(fr->safe_for_sender(thread), "Safety check");
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*fr = fr->java_sender();
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}
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} else {
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// More complex code with compiled code.
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assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
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CodeBlob* cb = CodeCache::find_blob(pc);
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if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
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// Not sure where the pc points to, fallback to default
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// stack overflow handling. In compiled code, we bang before
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// the frame is complete.
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return false;
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} else {
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intptr_t* fp = os::Linux::ucontext_get_fp(uc);
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intptr_t* sp = os::Linux::ucontext_get_sp(uc);
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*fr = frame(sp, (address)*sp);
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if (!fr->is_java_frame()) {
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assert(fr->safe_for_sender(thread), "Safety check");
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assert(!fr->is_first_frame(), "Safety check");
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*fr = fr->java_sender();
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}
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}
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}
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assert(fr->is_java_frame(), "Safety check");
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return true;
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}
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frame os::get_sender_for_C_frame(frame* fr) {
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if (*fr->sp() == 0) {
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// fr is the last C frame
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return frame(NULL, NULL);
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}
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return frame(fr->sender_sp(), fr->sender_pc());
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}
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frame os::current_frame() {
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intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer());
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// hack.
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frame topframe(csp, (address)0x8);
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// Return sender of sender of current topframe which hopefully
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// both have pc != NULL.
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frame tmp = os::get_sender_for_C_frame(&topframe);
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return os::get_sender_for_C_frame(&tmp);
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}
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// Utility functions
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extern "C" JNIEXPORT int
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JVM_handle_linux_signal(int sig,
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siginfo_t* info,
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void* ucVoid,
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int abort_if_unrecognized) {
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ucontext_t* uc = (ucontext_t*) ucVoid;
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Thread* t = Thread::current_or_null_safe();
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SignalHandlerMark shm(t);
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// Note: it's not uncommon that JNI code uses signal/sigset to install
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// then restore certain signal handler (e.g. to temporarily block SIGPIPE,
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// or have a SIGILL handler when detecting CPU type). When that happens,
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// JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
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// avoid unnecessary crash when libjsig is not preloaded, try handle signals
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// that do not require siginfo/ucontext first.
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if (sig == SIGPIPE) {
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if (os::Linux::chained_handler(sig, info, ucVoid)) {
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return true;
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} else {
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// Ignoring SIGPIPE - see bugs 4229104
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return true;
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}
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}
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// Make the signal handler transaction-aware by checking the existence of a
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// second (transactional) context with MSR TS bits active. If the signal is
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// caught during a transaction, then just return to the HTM abort handler.
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// Please refer to Linux kernel document powerpc/transactional_memory.txt,
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// section "Signals".
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if (uc && uc->uc_link) {
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ucontext_t* second_uc = uc->uc_link;
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// MSR TS bits are 29 and 30 (Power ISA, v2.07B, Book III-S, pp. 857-858,
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// 3.2.1 "Machine State Register"), however note that ISA notation for bit
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// numbering is MSB 0, so for normal bit numbering (LSB 0) they come to be
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// bits 33 and 34. It's not related to endianness, just a notation matter.
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if (second_uc->uc_mcontext.regs->msr & 0x600000000) {
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if (TraceTraps) {
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tty->print_cr("caught signal in transaction, "
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"ignoring to jump to abort handler");
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}
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// Return control to the HTM abort handler.
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return true;
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}
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}
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JavaThread* thread = NULL;
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VMThread* vmthread = NULL;
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if (os::Linux::signal_handlers_are_installed) {
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if (t != NULL) {
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if(t->is_Java_thread()) {
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thread = (JavaThread*)t;
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} else if(t->is_VM_thread()) {
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vmthread = (VMThread *)t;
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}
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}
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}
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// Moved SafeFetch32 handling outside thread!=NULL conditional block to make
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// it work if no associated JavaThread object exists.
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if (uc) {
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address const pc = os::Linux::ucontext_get_pc(uc);
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if (pc && StubRoutines::is_safefetch_fault(pc)) {
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os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
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return true;
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}
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}
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// decide if this trap can be handled by a stub
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address stub = NULL;
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address pc = NULL;
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//%note os_trap_1
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if (info != NULL && uc != NULL && thread != NULL) {
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pc = (address) os::Linux::ucontext_get_pc(uc);
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// Handle ALL stack overflow variations here
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if (sig == SIGSEGV) {
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// Si_addr may not be valid due to a bug in the linux-ppc64 kernel (see
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// comment below). Use get_stack_bang_address instead of si_addr.
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address addr = ((NativeInstruction*)pc)->get_stack_bang_address(uc);
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// Check if fault address is within thread stack.
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if (thread->on_local_stack(addr)) {
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// stack overflow
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if (thread->in_stack_yellow_reserved_zone(addr)) {
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if (thread->thread_state() == _thread_in_Java) {
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if (thread->in_stack_reserved_zone(addr)) {
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frame fr;
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if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) {
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assert(fr.is_java_frame(), "Must be a Javac frame");
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frame activation =
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SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
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if (activation.sp() != NULL) {
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thread->disable_stack_reserved_zone();
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if (activation.is_interpreted_frame()) {
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thread->set_reserved_stack_activation((address)activation.fp());
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} else {
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thread->set_reserved_stack_activation((address)activation.unextended_sp());
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}
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return 1;
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}
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}
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}
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// Throw a stack overflow exception.
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// Guard pages will be reenabled while unwinding the stack.
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thread->disable_stack_yellow_reserved_zone();
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stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
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} else {
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// Thread was in the vm or native code. Return and try to finish.
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thread->disable_stack_yellow_reserved_zone();
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return 1;
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}
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} else if (thread->in_stack_red_zone(addr)) {
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// Fatal red zone violation. Disable the guard pages and fall through
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// to handle_unexpected_exception way down below.
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thread->disable_stack_red_zone();
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tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
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// This is a likely cause, but hard to verify. Let's just print
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// it as a hint.
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tty->print_raw_cr("Please check if any of your loaded .so files has "
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"enabled executable stack (see man page execstack(8))");
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} else {
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// Accessing stack address below sp may cause SEGV if current
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// thread has MAP_GROWSDOWN stack. This should only happen when
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// current thread was created by user code with MAP_GROWSDOWN flag
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// and then attached to VM. See notes in os_linux.cpp.
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if (thread->osthread()->expanding_stack() == 0) {
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thread->osthread()->set_expanding_stack();
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if (os::Linux::manually_expand_stack(thread, addr)) {
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thread->osthread()->clear_expanding_stack();
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return 1;
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}
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thread->osthread()->clear_expanding_stack();
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} else {
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fatal("recursive segv. expanding stack.");
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}
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}
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}
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}
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if (thread->thread_state() == _thread_in_Java) {
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// Java thread running in Java code => find exception handler if any
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// a fault inside compiled code, the interpreter, or a stub
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// A VM-related SIGILL may only occur if we are not in the zero page.
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// On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else
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// in the zero page, because it is filled with 0x0. We ignore
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// explicit SIGILLs in the zero page.
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if (sig == SIGILL && (pc < (address) 0x200)) {
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if (TraceTraps) {
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tty->print_raw_cr("SIGILL happened inside zero page.");
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}
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goto report_and_die;
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}
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CodeBlob *cb = NULL;
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// Handle signal from NativeJump::patch_verified_entry().
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if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) ||
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(!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) {
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if (TraceTraps) {
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tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");
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}
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stub = SharedRuntime::get_handle_wrong_method_stub();
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}
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else if (sig == SIGSEGV &&
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// A linux-ppc64 kernel before 2.6.6 doesn't set si_addr on some segfaults
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// in 64bit mode (cf. http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.6),
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// especially when we try to read from the safepoint polling page. So the check
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// (address)info->si_addr == os::get_standard_polling_page()
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// doesn't work for us. We use:
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((NativeInstruction*)pc)->is_safepoint_poll() &&
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CodeCache::contains((void*) pc) &&
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((cb = CodeCache::find_blob(pc)) != NULL) &&
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cb->is_compiled()) {
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if (TraceTraps) {
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tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
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}
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stub = SharedRuntime::get_poll_stub(pc);
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}
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// SIGTRAP-based ic miss check in compiled code.
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else if (sig == SIGTRAP && TrapBasedICMissChecks &&
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nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) {
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if (TraceTraps) {
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tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc));
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}
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stub = SharedRuntime::get_ic_miss_stub();
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}
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// SIGTRAP-based implicit null check in compiled code.
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else if (sig == SIGTRAP && TrapBasedNullChecks &&
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nativeInstruction_at(pc)->is_sigtrap_null_check()) {
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if (TraceTraps) {
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tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc));
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}
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stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
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}
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// SIGSEGV-based implicit null check in compiled code.
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else if (sig == SIGSEGV && ImplicitNullChecks &&
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CodeCache::contains((void*) pc) &&
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!MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) {
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if (TraceTraps) {
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tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
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}
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stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
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}
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#ifdef COMPILER2
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// SIGTRAP-based implicit range check in compiled code.
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else if (sig == SIGTRAP && TrapBasedRangeChecks &&
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nativeInstruction_at(pc)->is_sigtrap_range_check()) {
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if (TraceTraps) {
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tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc));
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}
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stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
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}
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#endif
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else if (sig == SIGBUS) {
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// BugId 4454115: A read from a MappedByteBuffer can fault here if the
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// underlying file has been truncated. Do not crash the VM in such a case.
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CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
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CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
|
|
if (nm != NULL && nm->has_unsafe_access()) {
|
|
address next_pc = pc + 4;
|
|
next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc);
|
|
os::Linux::ucontext_set_pc(uc, next_pc);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
else { // thread->thread_state() != _thread_in_Java
|
|
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.
|
|
}
|
|
else if (thread->thread_state() == _thread_in_vm &&
|
|
sig == SIGBUS && thread->doing_unsafe_access()) {
|
|
address next_pc = pc + 4;
|
|
next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc);
|
|
os::Linux::ucontext_set_pc(uc, pc + 4);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// 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) &&
|
|
// Si_addr may not be valid due to a bug in the linux-ppc64 kernel (see comment above).
|
|
// Use is_memory_serialization instead of si_addr.
|
|
((NativeInstruction*)pc)->is_memory_serialization(thread, ucVoid)) {
|
|
// 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;
|
|
}
|
|
}
|
|
|
|
if (stub != NULL) {
|
|
// Save all thread context in case we need to restore it.
|
|
if (thread != NULL) thread->set_saved_exception_pc(pc);
|
|
os::Linux::ucontext_set_pc(uc, stub);
|
|
return true;
|
|
}
|
|
|
|
// signal-chaining
|
|
if (os::Linux::chained_handler(sig, info, ucVoid)) {
|
|
return true;
|
|
}
|
|
|
|
if (!abort_if_unrecognized) {
|
|
// caller wants another chance, so give it to him
|
|
return false;
|
|
}
|
|
|
|
if (pc == NULL && uc != NULL) {
|
|
pc = os::Linux::ucontext_get_pc(uc);
|
|
}
|
|
|
|
report_and_die:
|
|
// unmask current signal
|
|
sigset_t newset;
|
|
sigemptyset(&newset);
|
|
sigaddset(&newset, sig);
|
|
sigprocmask(SIG_UNBLOCK, &newset, NULL);
|
|
|
|
VMError::report_and_die(t, sig, pc, info, ucVoid);
|
|
|
|
ShouldNotReachHere();
|
|
return false;
|
|
}
|
|
|
|
void os::Linux::init_thread_fpu_state(void) {
|
|
// Disable FP exceptions.
|
|
__asm__ __volatile__ ("mtfsfi 6,0");
|
|
}
|
|
|
|
int os::Linux::get_fpu_control_word(void) {
|
|
// x86 has problems with FPU precision after pthread_cond_timedwait().
|
|
// nothing to do on ppc64.
|
|
return 0;
|
|
}
|
|
|
|
void os::Linux::set_fpu_control_word(int fpu_control) {
|
|
// x86 has problems with FPU precision after pthread_cond_timedwait().
|
|
// nothing to do on ppc64.
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// thread stack
|
|
|
|
// Minimum usable stack sizes required to get to user code. Space for
|
|
// HotSpot guard pages is added later.
|
|
size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K;
|
|
size_t os::Posix::_java_thread_min_stack_allowed = 64 * K;
|
|
size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
|
|
|
|
// Return default stack size for thr_type.
|
|
size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
|
|
// Default stack size (compiler thread needs larger stack).
|
|
size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
|
|
return s;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// 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.regs->nip);
|
|
st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.regs->link);
|
|
st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.regs->ctr);
|
|
st->cr();
|
|
for (int i = 0; i < 32; i++) {
|
|
st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.regs->gpr[i]);
|
|
if (i % 3 == 2) st->cr();
|
|
}
|
|
st->cr();
|
|
st->cr();
|
|
|
|
intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
|
|
st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(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::Linux::ucontext_get_pc(uc);
|
|
st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));
|
|
print_hex_dump(st, pc - 64, pc + 64, /*instrsize=*/4);
|
|
st->cr();
|
|
}
|
|
|
|
void os::print_register_info(outputStream *st, const void *context) {
|
|
if (context == NULL) return;
|
|
|
|
const ucontext_t *uc = (const ucontext_t*)context;
|
|
|
|
st->print_cr("Register to memory mapping:");
|
|
st->cr();
|
|
|
|
// this is only for the "general purpose" registers
|
|
for (int i = 0; i < 32; i++) {
|
|
st->print("r%-2d=", i);
|
|
print_location(st, uc->uc_mcontext.regs->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;
|
|
}
|