| /* |
| * Copyright (c) 1999, 2013, Oracle and/or its affiliates. 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 "asm/macroAssembler.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_solaris.h" |
| #include "memory/allocation.inline.hpp" |
| #include "mutex_solaris.inline.hpp" |
| #include "os_share_solaris.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" |
| |
| // put OS-includes here |
| # include <sys/types.h> |
| # include <sys/mman.h> |
| # include <pthread.h> |
| # include <signal.h> |
| # include <setjmp.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/trap.h> |
| # include <sys/lwp.h> |
| # include <pwd.h> |
| # include <poll.h> |
| # include <sys/lwp.h> |
| # include <procfs.h> // see comment in <sys/procfs.h> |
| |
| #ifndef AMD64 |
| // QQQ seems useless at this point |
| # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later |
| #endif // AMD64 |
| # 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 value |
| // but it's different for x86 and sparc because the page sizes are different. |
| #ifdef AMD64 |
| size_t os::Solaris::min_stack_allowed = 224*K; |
| #define REG_SP REG_RSP |
| #define REG_PC REG_RIP |
| #define REG_FP REG_RBP |
| #else |
| size_t os::Solaris::min_stack_allowed = 64*K; |
| #define REG_SP UESP |
| #define REG_PC EIP |
| #define REG_FP EBP |
| // 4900493 counter to prevent runaway LDTR refresh attempt |
| |
| static volatile int ldtr_refresh = 0; |
| // the libthread instruction that faults because of the stale LDTR |
| |
| static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs |
| }; |
| #endif // AMD64 |
| |
| 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; |
| } |
| |
| // |
| // 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; |
| } |
| if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_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; |
| |
| 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) { |
| return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]); |
| } |
| |
| // Assumes ucontext is valid |
| intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { |
| return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; |
| } |
| |
| // Assumes ucontext is valid |
| intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { |
| return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; |
| } |
| |
| address os::Solaris::ucontext_get_pc(ucontext_t *uc) { |
| return (address) uc->uc_mcontext.gregs[REG_PC]; |
| } |
| |
| // For Forte Analyzer AsyncGetCallTrace profiling support - thread |
| // is currently interrupted by SIGPROF. |
| // |
| // 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); |
| } |
| |
| 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); |
| if (ret_fp) *ret_fp = os::Solaris::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); |
| return frame(sp, fp, epc.pc()); |
| } |
| |
| frame os::get_sender_for_C_frame(frame* fr) { |
| return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); |
| } |
| |
| extern "C" intptr_t *_get_current_sp(); // in .il file |
| |
| address os::current_stack_pointer() { |
| return (address)_get_current_sp(); |
| } |
| |
| extern "C" intptr_t *_get_current_fp(); // in .il file |
| |
| frame os::current_frame() { |
| intptr_t* fp = _get_current_fp(); // it's inlined so want current fp |
| frame myframe((intptr_t*)os::current_stack_pointer(), |
| (intptr_t*)fp, |
| CAST_FROM_FN_PTR(address, os::current_frame)); |
| if (os::is_first_C_frame(&myframe)) { |
| // stack is not walkable |
| frame ret; // This will be a null useless frame |
| return ret; |
| } else { |
| return os::get_sender_for_C_frame(&myframe); |
| } |
| } |
| |
| 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); |
| } |
| |
| #ifndef AMD64 |
| |
| // Detecting SSE support by OS |
| // From solaris_i486.s |
| extern "C" bool sse_check(); |
| extern "C" bool sse_unavailable(); |
| |
| enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; |
| static int sse_status = SSE_UNKNOWN; |
| |
| |
| static void check_for_sse_support() { |
| if (!VM_Version::supports_sse()) { |
| sse_status = SSE_NOT_SUPPORTED; |
| return; |
| } |
| // looking for _sse_hw in libc.so, if it does not exist or |
| // the value (int) is 0, OS has no support for SSE |
| int *sse_hwp; |
| void *h; |
| |
| if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { |
| //open failed, presume no support for SSE |
| sse_status = SSE_NOT_SUPPORTED; |
| return; |
| } |
| if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { |
| sse_status = SSE_NOT_SUPPORTED; |
| } else if (*sse_hwp == 0) { |
| sse_status = SSE_NOT_SUPPORTED; |
| } |
| dlclose(h); |
| |
| if (sse_status == SSE_UNKNOWN) { |
| bool (*try_sse)() = (bool (*)())sse_check; |
| sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; |
| } |
| |
| } |
| |
| #endif // AMD64 |
| |
| bool os::supports_sse() { |
| #ifdef AMD64 |
| return true; |
| #else |
| if (sse_status == SSE_UNKNOWN) |
| check_for_sse_support(); |
| return sse_status == SSE_SUPPORTED; |
| #endif // AMD64 |
| } |
| |
| bool os::is_allocatable(size_t bytes) { |
| #ifdef AMD64 |
| return true; |
| #else |
| |
| if (bytes < 2 * G) { |
| return true; |
| } |
| |
| char* addr = reserve_memory(bytes, NULL); |
| |
| if (addr != NULL) { |
| release_memory(addr, bytes); |
| } |
| |
| return addr != NULL; |
| #endif // AMD64 |
| |
| } |
| |
| extern "C" JNIEXPORT int |
| JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, |
| int abort_if_unrecognized) { |
| ucontext_t* uc = (ucontext_t*) ucVoid; |
| |
| #ifndef AMD64 |
| if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { |
| // the SSE instruction faulted. supports_sse() need return false. |
| uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; |
| return true; |
| } |
| #endif // !AMD64 |
| |
| Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady |
| |
| // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away |
| // (no destructors can be run) |
| os::WatcherThreadCrashProtection::check_crash_protection(sig, t); |
| |
| 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 || vmthread){ |
| OSThread::SR_handler(t, uc); |
| 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; |
| |
| //%note os_trap_1 |
| if (info != NULL && uc != NULL && thread != NULL) { |
| // factor me: getPCfromContext |
| pc = (address) uc->uc_mcontext.gregs[REG_PC]; |
| |
| if (StubRoutines::is_safefetch_fault(pc)) { |
| uc->uc_mcontext.gregs[REG_PC] = intptr_t(StubRoutines::continuation_for_safefetch_fault(pc)); |
| 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(); |
| 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."); |
| } |
| } |
| |
| 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(); |
| } |
| } |
| |
| if (thread->thread_state() == _thread_in_Java) { |
| // Support Safepoint Polling |
| if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { |
| stub = SharedRuntime::get_poll_stub(pc); |
| } |
| 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); |
| } |
| #ifndef AMD64 |
| 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); |
| } |
| else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { |
| // The encoding of D2I in i486.ad can cause an exception prior |
| // to the fist instruction if there was an invalid operation |
| // pending. We want to dismiss that exception. From the win_32 |
| // side it also seems that if it really was the fist causing |
| // the exception that we do the d2i by hand with different |
| // rounding. Seems kind of weird. QQQ TODO |
| // Note that we take the exception at the NEXT floating point instruction. |
| if (pc[0] == 0xDB) { |
| assert(pc[0] == 0xDB, "not a FIST opcode"); |
| assert(pc[1] == 0x14, "not a FIST opcode"); |
| assert(pc[2] == 0x24, "not a FIST opcode"); |
| return true; |
| } else { |
| assert(pc[-3] == 0xDB, "not an flt invalid opcode"); |
| assert(pc[-2] == 0x14, "not an flt invalid opcode"); |
| assert(pc[-1] == 0x24, "not an flt invalid opcode"); |
| } |
| } |
| else if (sig == SIGFPE ) { |
| tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); |
| } |
| #endif // !AMD64 |
| |
| // QQQ It doesn't seem that we need to do this on x86 because we should be able |
| // to return properly from the handler without this extra stuff on the back side. |
| |
| 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 we can just return to retry the write. |
| 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; |
| } |
| } |
| |
| // Execution protection violation |
| // |
| // Preventative code for future versions of Solaris which may |
| // enable execution protection when running the 32-bit VM on AMD64. |
| // |
| // This should be kept as the last step in the triage. We don't |
| // have a dedicated trap number for a no-execute fault, so be |
| // conservative and allow other handlers the first shot. |
| // |
| // Note: We don't test that info->si_code == SEGV_ACCERR here. |
| // this si_code is so generic that it is almost meaningless; and |
| // the si_code for this condition may change in the future. |
| // Furthermore, a false-positive should be harmless. |
| if (UnguardOnExecutionViolation > 0 && |
| (sig == SIGSEGV || sig == SIGBUS) && |
| uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault |
| int page_size = os::vm_page_size(); |
| address addr = (address) info->si_addr; |
| address pc = (address) uc->uc_mcontext.gregs[REG_PC]; |
| // Make sure the pc and the faulting address are sane. |
| // |
| // If an instruction spans a page boundary, and the page containing |
| // the beginning of the instruction is executable but the following |
| // page is not, the pc and the faulting address might be slightly |
| // different - we still want to unguard the 2nd page in this case. |
| // |
| // 15 bytes seems to be a (very) safe value for max instruction size. |
| bool pc_is_near_addr = |
| (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); |
| bool instr_spans_page_boundary = |
| (align_size_down((intptr_t) pc ^ (intptr_t) addr, |
| (intptr_t) page_size) > 0); |
| |
| if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { |
| static volatile address last_addr = |
| (address) os::non_memory_address_word(); |
| |
| // In conservative mode, don't unguard unless the address is in the VM |
| if (addr != last_addr && |
| (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { |
| |
| // Make memory rwx and retry |
| address page_start = |
| (address) align_size_down((intptr_t) addr, (intptr_t) page_size); |
| bool res = os::protect_memory((char*) page_start, page_size, |
| os::MEM_PROT_RWX); |
| |
| if (PrintMiscellaneous && Verbose) { |
| char buf[256]; |
| jio_snprintf(buf, sizeof(buf), "Execution protection violation " |
| "at " INTPTR_FORMAT |
| ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, |
| page_start, (res ? "success" : "failed"), errno); |
| tty->print_raw_cr(buf); |
| } |
| stub = pc; |
| |
| // Set last_addr so if we fault again at the same address, we don't end |
| // up in an endless loop. |
| // |
| // There are two potential complications here. Two threads trapping at |
| // the same address at the same time could cause one of the threads to |
| // think it already unguarded, and abort the VM. Likely very rare. |
| // |
| // The other race involves two threads alternately trapping at |
| // different addresses and failing to unguard the page, resulting in |
| // an endless loop. This condition is probably even more unlikely than |
| // the first. |
| // |
| // Although both cases could be avoided by using locks or thread local |
| // last_addr, these solutions are unnecessary complication: this |
| // handler is a best-effort safety net, not a complete solution. It is |
| // disabled by default and should only be used as a workaround in case |
| // we missed any no-execute-unsafe VM code. |
| |
| last_addr = addr; |
| } |
| } |
| } |
| |
| if (stub != NULL) { |
| // save all thread context in case we need to restore it |
| |
| if (thread != NULL) thread->set_saved_exception_pc(pc); |
| // 12/02/99: On Sparc it appears that the full context is also saved |
| // but as yet, no one looks at or restores that saved context |
| // factor me: setPC |
| uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; |
| return true; |
| } |
| |
| // signal-chaining |
| if (os::Solaris::chained_handler(sig, info, ucVoid)) { |
| return true; |
| } |
| |
| #ifndef AMD64 |
| // Workaround (bug 4900493) for Solaris kernel bug 4966651. |
| // Handle an undefined selector caused by an attempt to assign |
| // fs in libthread getipriptr(). With the current libthread design every 512 |
| // thread creations the LDT for a private thread data structure is extended |
| // and thre is a hazard that and another thread attempting a thread creation |
| // will use a stale LDTR that doesn't reflect the structure's growth, |
| // causing a GP fault. |
| // Enforce the probable limit of passes through here to guard against an |
| // infinite loop if some other move to fs caused the GP fault. Note that |
| // this loop counter is ultimately a heuristic as it is possible for |
| // more than one thread to generate this fault at a time in an MP system. |
| // In the case of the loop count being exceeded or if the poll fails |
| // just fall through to a fatal error. |
| // If there is some other source of T_GPFLT traps and the text at EIP is |
| // unreadable this code will loop infinitely until the stack is exausted. |
| // The key to diagnosis in this case is to look for the bottom signal handler |
| // frame. |
| |
| if(! IgnoreLibthreadGPFault) { |
| if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { |
| const unsigned char *p = |
| (unsigned const char *) uc->uc_mcontext.gregs[EIP]; |
| |
| // Expected instruction? |
| |
| if(p[0] == movlfs[0] && p[1] == movlfs[1]) { |
| |
| Atomic::inc(&ldtr_refresh); |
| |
| // Infinite loop? |
| |
| if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { |
| |
| // No, force scheduling to get a fresh view of the LDTR |
| |
| if(poll(NULL, 0, 10) == 0) { |
| |
| // Retry the move |
| |
| return false; |
| } |
| } |
| } |
| } |
| } |
| #endif // !AMD64 |
| |
| 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 occurred under user-defined signal handler %#lx", sig, (long)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); |
| |
| // Determine which sort of error to throw. Out of swap may signal |
| // on the thread stack, which could get a mapping error when touched. |
| address addr = (address) info->si_addr; |
| if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) { |
| vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack."); |
| } |
| |
| 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:"); |
| #ifdef AMD64 |
| st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); |
| st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); |
| st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); |
| st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); |
| st->cr(); |
| st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); |
| st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); |
| st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); |
| st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); |
| st->cr(); |
| st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); |
| st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); |
| st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); |
| st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); |
| st->cr(); |
| st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); |
| st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); |
| st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); |
| st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); |
| st->cr(); |
| st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); |
| st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); |
| #else |
| st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); |
| st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); |
| st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); |
| st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); |
| st->cr(); |
| st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); |
| st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); |
| st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); |
| st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); |
| st->cr(); |
| st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); |
| st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); |
| #endif // AMD64 |
| 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 + 8*sizeof(intptr_t)), 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 - 32, pc + 32, sizeof(char)); |
| } |
| |
| void os::print_register_info(outputStream *st, void *context) { |
| if (context == NULL) return; |
| |
| ucontext_t *uc = (ucontext_t*)context; |
| |
| st->print_cr("Register to memory mapping:"); |
| st->cr(); |
| |
| // this is horrendously verbose but the layout of the registers in the |
| // context does not match how we defined our abstract Register set, so |
| // we can't just iterate through the gregs area |
| |
| // this is only for the "general purpose" registers |
| |
| #ifdef AMD64 |
| st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); |
| st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); |
| st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); |
| st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); |
| st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); |
| st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); |
| st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); |
| st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); |
| st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); |
| st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); |
| st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); |
| st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); |
| st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); |
| st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); |
| st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); |
| st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); |
| #else |
| st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[EAX]); |
| st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[EBX]); |
| st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[ECX]); |
| st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[EDX]); |
| st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[UESP]); |
| st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[EBP]); |
| st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[ESI]); |
| st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[EDI]); |
| #endif |
| |
| st->cr(); |
| } |
| |
| |
| #ifdef AMD64 |
| void os::Solaris::init_thread_fpu_state(void) { |
| // Nothing to do |
| } |
| #else |
| // From solaris_i486.s |
| extern "C" void fixcw(); |
| |
| void os::Solaris::init_thread_fpu_state(void) { |
| // Set fpu to 53 bit precision. This happens too early to use a stub. |
| fixcw(); |
| } |
| |
| // These routines are the initial value of atomic_xchg_entry(), |
| // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() |
| // until initialization is complete. |
| // TODO - replace with .il implementation when compiler supports it. |
| |
| 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*); |
| |
| 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; |
| } |
| |
| 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; |
| |
| extern "C" void _solaris_raw_setup_fpu(address ptr); |
| void os::setup_fpu() { |
| address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); |
| _solaris_raw_setup_fpu(fpu_cntrl); |
| } |
| #endif // AMD64 |
| |
| #ifndef PRODUCT |
| void os::verify_stack_alignment() { |
| #ifdef AMD64 |
| assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); |
| #endif |
| } |
| #endif |