Mercurial > hg > truffle
diff src/os_cpu/solaris_sparc/vm/os_solaris_sparc.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 98cb887364d3 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os_cpu/solaris_sparc/vm/os_solaris_sparc.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,712 @@ +/* + * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// do not include precompiled header file + +# include <signal.h> // needed first to avoid name collision for "std" with SC 5.0 + +# include "incls/_os_solaris_sparc.cpp.incl" + +// put OS-includes here +# include <sys/types.h> +# include <sys/mman.h> +# include <pthread.h> +# include <errno.h> +# include <dlfcn.h> +# include <stdio.h> +# include <unistd.h> +# include <sys/resource.h> +# include <thread.h> +# include <sys/stat.h> +# include <sys/time.h> +# include <sys/filio.h> +# include <sys/utsname.h> +# include <sys/systeminfo.h> +# include <sys/socket.h> +# include <sys/lwp.h> +# include <pwd.h> +# include <poll.h> +# include <sys/lwp.h> + +# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later +# include <sys/procfs.h> // see comment in <sys/procfs.h> + +#define MAX_PATH (2 * K) + +// Minimum stack size for the VM. It's easier to document a constant +// but it's different for x86 and sparc because the page sizes are different. +#ifdef _LP64 +size_t os::Solaris::min_stack_allowed = 128*K; +#else +size_t os::Solaris::min_stack_allowed = 96*K; +#endif + +int os::Solaris::max_register_window_saves_before_flushing() { + // We should detect this at run time. For now, filling + // in with a constant. + return 8; +} + +static void handle_unflushed_register_windows(gwindows_t *win) { + int restore_count = win->wbcnt; + int i; + + for(i=0; i<restore_count; i++) { + address sp = ((address)win->spbuf[i]) + STACK_BIAS; + address reg_win = (address)&win->wbuf[i]; + memcpy(sp,reg_win,sizeof(struct rwindow)); + } +} + +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). + // On SPARC, 0 != %hi(any real address), because there is no + // allocation in the first 1Kb of the virtual address space. + return (char*) 0; +} + +// Validate a ucontext retrieved from walking a uc_link of a ucontext. +// There are issues with libthread giving out uc_links for different threads +// on the same uc_link chain and bad or circular links. +// +bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) { + if (valid >= suspect || + valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags || + valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp || + valid->uc_stack.ss_size != suspect->uc_stack.ss_size) { + DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");) + return false; + } + + if (thread->is_Java_thread()) { + if (!valid_stack_address(thread, (address)suspect)) { + DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");) + return false; + } + address _sp = (address)((intptr_t)suspect->uc_mcontext.gregs[REG_SP] + STACK_BIAS); + if (!valid_stack_address(thread, _sp) || + !frame::is_valid_stack_pointer(((JavaThread*)thread)->base_of_stack_pointer(), (intptr_t*)_sp)) { + DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");) + return false; + } + } + return true; +} + +// We will only follow one level of uc_link since there are libthread +// issues with ucontext linking and it is better to be safe and just +// let caller retry later. +ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread, + ucontext_t *uc) { + + ucontext_t *retuc = NULL; + + // Sometimes the topmost register windows are not properly flushed. + // i.e., if the kernel would have needed to take a page fault + if (uc != NULL && uc->uc_mcontext.gwins != NULL) { + ::handle_unflushed_register_windows(uc->uc_mcontext.gwins); + } + + if (uc != NULL) { + if (uc->uc_link == NULL) { + // cannot validate without uc_link so accept current ucontext + retuc = uc; + } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { + // first ucontext is valid so try the next one + uc = uc->uc_link; + if (uc->uc_link == NULL) { + // cannot validate without uc_link so accept current ucontext + retuc = uc; + } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { + // the ucontext one level down is also valid so return it + retuc = uc; + } + } + } + return retuc; +} + +// Assumes ucontext is valid +ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) { + address pc = (address)uc->uc_mcontext.gregs[REG_PC]; + // set npc to zero to avoid using it for safepoint, good for profiling only + return ExtendedPC(pc); +} + +// Assumes ucontext is valid +intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { + return (intptr_t*)((intptr_t)uc->uc_mcontext.gregs[REG_SP] + STACK_BIAS); +} + +// Solaris X86 only +intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { + ShouldNotReachHere(); + return NULL; +} + +// For Forte Analyzer AsyncGetCallTrace profiling support - thread +// is currently interrupted by SIGPROF. +// +// ret_fp parameter is only used by Solaris X86. +// +// The difference between this and os::fetch_frame_from_context() is that +// here we try to skip nested signal frames. +ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, + ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { + + assert(thread != NULL, "just checking"); + assert(ret_sp != NULL, "just checking"); + assert(ret_fp == NULL, "just checking"); + + ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); + + return os::fetch_frame_from_context(luc, ret_sp, ret_fp); +} + + +// ret_fp parameter is only used by Solaris X86. +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 = os::Solaris::ucontext_get_ExtendedPC(uc); + if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); + } else { + // construct empty ExtendedPC for return value checking + epc = ExtendedPC(NULL); + if (ret_sp) *ret_sp = (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); + return frame(sp, frame::unpatchable, epc.pc()); +} + +frame os::get_sender_for_C_frame(frame* fr) { + return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); +} + +frame os::current_frame() { + intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); + frame myframe(sp, frame::unpatchable, + CAST_FROM_FN_PTR(address, os::current_frame)); + if (os::is_first_C_frame(&myframe)) { + // stack is not walkable + return frame(NULL, NULL, NULL); + } else { + return os::get_sender_for_C_frame(&myframe); + } +} + + +void GetThreadPC_Callback::execute(OSThread::InterruptArguments *args) { + Thread* thread = args->thread(); + ucontext_t* uc = args->ucontext(); + intptr_t* sp; + + assert(ProfileVM && thread->is_VM_thread(), "just checking"); + + // Skip the mcontext corruption verification. If if occasionally + // things get corrupt, it is ok for profiling - we will just get an unresolved + // function name + ExtendedPC new_addr((address)uc->uc_mcontext.gregs[REG_PC]); + _addr = new_addr; +} + + +static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) { + char lwpstatusfile[PROCFILE_LENGTH]; + int lwpfd, err; + + if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs)) + return (err); + if (*flags == TRS_LWPID) { + sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(), + *lwp); + if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) { + perror("thr_mutator_status: open lwpstatus"); + return (EINVAL); + } + if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) != + sizeof (lwpstatus_t)) { + perror("thr_mutator_status: read lwpstatus"); + (void) close(lwpfd); + return (EINVAL); + } + (void) close(lwpfd); + } + return (0); +} + + +bool os::is_allocatable(size_t bytes) { +#ifdef _LP64 + return true; +#else + return (bytes <= (size_t)3835*M); +#endif +} + +extern "C" void Fetch32PFI () ; +extern "C" void Fetch32Resume () ; +extern "C" void FetchNPFI () ; +extern "C" void FetchNResume () ; + +extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); + +int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) { + ucontext_t* uc = (ucontext_t*) ucVoid; + + Thread* t = ThreadLocalStorage::get_thread_slow(); + + SignalHandlerMark shm(t); + + if(sig == SIGPIPE || sig == SIGXFSZ) { + if (os::Solaris::chained_handler(sig, info, ucVoid)) { + return true; + } else { + if (PrintMiscellaneous && (WizardMode || Verbose)) { + char buf[64]; + warning("Ignoring %s - see 4229104 or 6499219", + os::exception_name(sig, buf, sizeof(buf))); + + } + return true; + } + } + + JavaThread* thread = NULL; + VMThread* vmthread = NULL; + if (os::Solaris::signal_handlers_are_installed) { + if (t != NULL ){ + if(t->is_Java_thread()) { + thread = (JavaThread*)t; + } + else if(t->is_VM_thread()){ + vmthread = (VMThread *)t; + } + } + } + + guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs"); + + if (sig == os::Solaris::SIGasync()) { + if (thread) { + OSThread::InterruptArguments args(thread, uc); + thread->osthread()->do_interrupt_callbacks_at_interrupt(&args); + return true; + } else if (vmthread) { + OSThread::InterruptArguments args(vmthread, uc); + vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args); + return true; + } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { + return true; + } else { + // If os::Solaris::SIGasync not chained, and this is a non-vm and + // non-java thread + return true; + } + } + + if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { + // can't decode this kind of signal + info = NULL; + } else { + assert(sig == info->si_signo, "bad siginfo"); + } + + // decide if this trap can be handled by a stub + address stub = NULL; + + address pc = NULL; + address npc = NULL; + + //%note os_trap_1 + if (info != NULL && uc != NULL && thread != NULL) { + // factor me: getPCfromContext + pc = (address) uc->uc_mcontext.gregs[REG_PC]; + npc = (address) uc->uc_mcontext.gregs[REG_nPC]; + + // SafeFetch() support + // Implemented with either a fixed set of addresses such + // as Fetch32*, or with Thread._OnTrap. + if (uc->uc_mcontext.gregs[REG_PC] == intptr_t(Fetch32PFI)) { + uc->uc_mcontext.gregs [REG_PC] = intptr_t(Fetch32Resume) ; + uc->uc_mcontext.gregs [REG_nPC] = intptr_t(Fetch32Resume) + 4 ; + return true ; + } + if (uc->uc_mcontext.gregs[REG_PC] == intptr_t(FetchNPFI)) { + uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ; + uc->uc_mcontext.gregs [REG_nPC] = intptr_t(FetchNResume) + 4 ; + return true ; + } + + // Handle ALL stack overflow variations here + if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { + address addr = (address) info->si_addr; + if (thread->in_stack_yellow_zone(addr)) { + thread->disable_stack_yellow_zone(); + // Sometimes the register windows are not properly flushed. + if(uc->uc_mcontext.gwins != NULL) { + ::handle_unflushed_register_windows(uc->uc_mcontext.gwins); + } + 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); + } else { + // Thread was in the vm or native code. Return and try to finish. + return true; + } + } 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."); + // Sometimes the register windows are not properly flushed. + if(uc->uc_mcontext.gwins != NULL) { + ::handle_unflushed_register_windows(uc->uc_mcontext.gwins); + } + } + } + + + if (thread->thread_state() == _thread_in_vm) { + if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { + stub = StubRoutines::handler_for_unsafe_access(); + } + } + + else if (thread->thread_state() == _thread_in_Java) { + // Java thread running in Java code => find exception handler if any + // a fault inside compiled code, the interpreter, or a stub + + // Support Safepoint Polling + if ( sig == SIGSEGV && (address)info->si_addr == os::get_polling_page() ) { + stub = SharedRuntime::get_poll_stub(pc); + } + + // Not needed on x86 solaris because verify_oops doesn't generate + // SEGV/BUS like sparc does. + if ( (sig == SIGSEGV || sig == SIGBUS) + && pc >= MacroAssembler::_verify_oop_implicit_branch[0] + && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { + stub = MacroAssembler::_verify_oop_implicit_branch[2]; + warning("fixed up memory fault in +VerifyOops at address " INTPTR_FORMAT, info->si_addr); + } + + // This is not factored because on x86 solaris the patching for + // zombies does not generate a SEGV. + else if (sig == SIGSEGV && nativeInstruction_at(pc)->is_zombie()) { + // zombie method (ld [%g0],%o7 instruction) + stub = SharedRuntime::get_handle_wrong_method_stub(); + + // At the stub it needs to look like a call from the caller of this + // method (not a call from the segv site). + pc = (address)uc->uc_mcontext.gregs[REG_O7]; + } + else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { + // 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()) { + stub = StubRoutines::handler_for_unsafe_access(); + } + } + + else if (sig == SIGFPE && info->si_code == FPE_INTDIV) { + // integer divide by zero + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); + } + else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { + // floating-point divide by zero + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); + } +#ifdef COMPILER2 + else if (sig == SIGILL && nativeInstruction_at(pc)->is_ic_miss_trap()) { +#ifdef ASSERT + #ifdef TIERED + CodeBlob* cb = CodeCache::find_blob_unsafe(pc); + assert(cb->is_compiled_by_c2(), "Wrong compiler"); + #endif // TIERED +#endif // ASSERT + // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. + stub = SharedRuntime::get_ic_miss_stub(); + // At the stub it needs to look like a call from the caller of this + // method (not a call from the segv site). + pc = (address)uc->uc_mcontext.gregs[REG_O7]; + } +#endif // COMPILER2 + + else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { + // Determination of interpreter/vtable stub/compiled code null exception + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); + } + } + + // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in + // and the heap gets shrunk before the field access. + if ((sig == SIGSEGV) || (sig == SIGBUS)) { + address addr = JNI_FastGetField::find_slowcase_pc(pc); + if (addr != (address)-1) { + stub = addr; + } + } + + // 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 just return. + if ((sig == SIGSEGV) && + os::is_memory_serialize_page(thread, (address)info->si_addr)) { + // 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 + + thread->set_saved_exception_pc(pc); + thread->set_saved_exception_npc(npc); + + // simulate a branch to the stub (a "call" in the safepoint stub case) + // factor me: setPC + uc->uc_mcontext.gregs[REG_PC ] = (greg_t)stub; + uc->uc_mcontext.gregs[REG_nPC] = (greg_t)(stub + 4); + +#ifndef PRODUCT + if (TraceJumps) thread->record_jump(stub, NULL, __FILE__, __LINE__); +#endif /* PRODUCT */ + + return true; + } + + // signal-chaining + if (os::Solaris::chained_handler(sig, info, ucVoid)) { + return true; + } + + if (!abort_if_unrecognized) { + // caller wants another chance, so give it to him + return false; + } + + if (!os::Solaris::libjsig_is_loaded) { + struct sigaction oldAct; + sigaction(sig, (struct sigaction *)0, &oldAct); + if (oldAct.sa_sigaction != signalHandler) { + void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) + : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); + warning("Unexpected Signal %d occured under user-defined signal handler " INTPTR_FORMAT, sig, (intptr_t)sighand); + } + } + + if (pc == NULL && uc != NULL) { + pc = (address) uc->uc_mcontext.gregs[REG_PC]; + } + + // unmask current signal + sigset_t newset; + sigemptyset(&newset); + sigaddset(&newset, sig); + sigprocmask(SIG_UNBLOCK, &newset, NULL); + + VMError err(t, sig, pc, info, ucVoid); + err.report_and_die(); + + ShouldNotReachHere(); +} + +void os::print_context(outputStream *st, void *context) { + if (context == NULL) return; + + ucontext_t *uc = (ucontext_t*)context; + st->print_cr("Registers:"); + + st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT + " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, + uc->uc_mcontext.gregs[REG_O0], + uc->uc_mcontext.gregs[REG_O1], + uc->uc_mcontext.gregs[REG_O2], + uc->uc_mcontext.gregs[REG_O3]); + st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT + " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, + uc->uc_mcontext.gregs[REG_O4], + uc->uc_mcontext.gregs[REG_O5], + uc->uc_mcontext.gregs[REG_O6], + uc->uc_mcontext.gregs[REG_O7]); + + st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT + " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, + uc->uc_mcontext.gregs[REG_G1], + uc->uc_mcontext.gregs[REG_G2], + uc->uc_mcontext.gregs[REG_G3], + uc->uc_mcontext.gregs[REG_G4]); + st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT + " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, + uc->uc_mcontext.gregs[REG_G5], + uc->uc_mcontext.gregs[REG_G6], + uc->uc_mcontext.gregs[REG_G7], + uc->uc_mcontext.gregs[REG_Y]); + + st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, + uc->uc_mcontext.gregs[REG_PC], + uc->uc_mcontext.gregs[REG_nPC]); + st->cr(); + st->cr(); + + intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); + st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); + print_hex_dump(st, (address)sp, (address)(sp + 32), 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. + ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); + address pc = epc.pc(); + st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); + print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); +} + +void os::Solaris::init_thread_fpu_state(void) { + // Nothing needed on Sparc. +} + +#if !defined(COMPILER2) && !defined(_LP64) + +// These routines are the initial value of atomic_xchg_entry(), +// atomic_cmpxchg_entry(), atomic_add_entry() and fence_entry() +// until initialization is complete. +// TODO - remove when the VM drops support for V8. + +typedef jint xchg_func_t (jint, volatile jint*); +typedef jint cmpxchg_func_t (jint, volatile jint*, jint); +typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong); +typedef jint add_func_t (jint, volatile jint*); +typedef void fence_func_t (); + +jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { + // try to use the stub: + xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); + + if (func != NULL) { + os::atomic_xchg_func = func; + return (*func)(exchange_value, dest); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + jint old_value = *dest; + *dest = exchange_value; + return old_value; +} + +jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { + // try to use the stub: + cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); + + if (func != NULL) { + os::atomic_cmpxchg_func = func; + return (*func)(exchange_value, dest, compare_value); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + jint old_value = *dest; + if (old_value == compare_value) + *dest = exchange_value; + return old_value; +} + +jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { + // try to use the stub: + cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); + + if (func != NULL) { + os::atomic_cmpxchg_long_func = func; + return (*func)(exchange_value, dest, compare_value); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + jlong old_value = *dest; + if (old_value == compare_value) + *dest = exchange_value; + return old_value; +} + +jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { + // try to use the stub: + add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); + + if (func != NULL) { + os::atomic_add_func = func; + return (*func)(add_value, dest); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + return (*dest) += add_value; +} + +void os::fence_bootstrap() { + // try to use the stub: + fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry()); + + if (func != NULL) { + os::fence_func = func; + (*func)(); + return; + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + // don't have to do anything for a single thread +} + +xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; +cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; +cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; +add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; +fence_func_t* os::fence_func = os::fence_bootstrap; + +#endif // !_LP64 && !COMPILER2 + +#if defined(__sparc) && defined(COMPILER2) && defined(_GNU_SOURCE) + // See file build/solaris/makefiles/$compiler.make + // For compiler1 the architecture is v8 and frps isn't present in v8 + extern "C" void _mark_fpu_nosave() { + __asm__ __volatile__ ("wr %%g0, 0, %%fprs \n\t" : : :); + } +#endif //defined(__sparc) && defined(COMPILER2)