--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os_cpu/solaris_x86/os_solaris_x86.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,996 @@
+/*
+ * Copyright (c) 1999, 2017, 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/codeCache.hpp"
+#include "code/icBuffer.hpp"
+#include "code/vtableStubs.hpp"
+#include "interpreter/interpreter.hpp"
+#include "jvm_solaris.h"
+#include "memory/allocation.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/atomic.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/align.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 <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 usable stack sizes required to get to user code. Space for
+// HotSpot guard pages is added later.
+#ifdef _LP64
+// The adlc generated method 'State::MachNodeGenerator(int)' used by the C2 compiler
+// threads requires a large stack with the Solaris Studio C++ compiler version 5.13
+// and product VM builds (debug builds require significantly less stack space).
+size_t os::Posix::_compiler_thread_min_stack_allowed = 325 * K;
+size_t os::Posix::_java_thread_min_stack_allowed = 48 * K;
+size_t os::Posix::_vm_internal_thread_min_stack_allowed = 224 * K;
+#else
+size_t os::Posix::_compiler_thread_min_stack_allowed = 32 * K;
+size_t os::Posix::_java_thread_min_stack_allowed = 32 * K;
+size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
+#endif // _LP64
+
+#ifdef AMD64
+#define REG_SP REG_RSP
+#define REG_PC REG_RIP
+#define REG_FP REG_RBP
+#else
+#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, const ucontext_t* valid, const 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.
+const ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
+ const ucontext_t *uc) {
+
+ const 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(const ucontext_t *uc) {
+ return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]);
+}
+
+void os::Solaris::ucontext_set_pc(ucontext_t* uc, address pc) {
+ uc->uc_mcontext.gregs [REG_PC] = (greg_t) pc;
+}
+
+// Assumes ucontext is valid
+intptr_t* os::Solaris::ucontext_get_sp(const ucontext_t *uc) {
+ return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
+}
+
+// Assumes ucontext is valid
+intptr_t* os::Solaris::ucontext_get_fp(const ucontext_t *uc) {
+ return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
+}
+
+address os::Solaris::ucontext_get_pc(const 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.
+// This method is also used for stack overflow signal handling.
+ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread,
+ const 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");
+
+ const 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(const void* ucVoid,
+ intptr_t** ret_sp, intptr_t** ret_fp) {
+
+ ExtendedPC epc;
+ const ucontext_t *uc = (const ucontext_t*)ucVoid;
+
+ if (uc != NULL) {
+ epc = 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(const 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::fetch_frame_from_ucontext(Thread* thread, void* ucVoid) {
+ intptr_t* sp;
+ intptr_t* fp;
+ ExtendedPC epc = os::Solaris::fetch_frame_from_ucontext(thread, (ucontext_t*)ucVoid, &sp, &fp);
+ return frame(sp, fp, epc.pc());
+}
+
+bool os::Solaris::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
+ address pc = (address) os::Solaris::ucontext_get_pc(uc);
+ if (Interpreter::contains(pc)) {
+ // interpreter performs stack banging after the fixed frame header has
+ // been generated while the compilers perform it before. To maintain
+ // semantic consistency between interpreted and compiled frames, the
+ // method returns the Java sender of the current frame.
+ *fr = os::fetch_frame_from_ucontext(thread, uc);
+ if (!fr->is_first_java_frame()) {
+ // get_frame_at_stack_banging_point() is only called when we
+ // have well defined stacks so java_sender() calls do not need
+ // to assert safe_for_sender() first.
+ *fr = fr->java_sender();
+ }
+ } else {
+ // more complex code with compiled code
+ assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
+ CodeBlob* cb = CodeCache::find_blob(pc);
+ if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
+ // Not sure where the pc points to, fallback to default
+ // stack overflow handling
+ return false;
+ } else {
+ // in compiled code, the stack banging is performed just after the return pc
+ // has been pushed on the stack
+ intptr_t* fp = os::Solaris::ucontext_get_fp(uc);
+ intptr_t* sp = os::Solaris::ucontext_get_sp(uc);
+ *fr = frame(sp + 1, fp, (address)*sp);
+ if (!fr->is_java_frame()) {
+ // See java_sender() comment above.
+ *fr = fr->java_sender();
+ }
+ }
+ }
+ assert(fr->is_java_frame(), "Safety check");
+ return true;
+}
+
+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
+ // fp is for os::current_frame. We want the fp for our caller.
+ frame myframe((intptr_t*)os::current_stack_pointer(),
+ (intptr_t*)fp,
+ CAST_FROM_FN_PTR(address, os::current_frame));
+ frame caller_frame = os::get_sender_for_C_frame(&myframe);
+
+ if (os::is_first_C_frame(&caller_frame)) {
+ // stack is not walkable
+ frame ret; // This will be a null useless frame
+ return ret;
+ } else {
+ // return frame for our caller's caller
+ return os::get_sender_for_C_frame(&caller_frame);
+ }
+}
+
+#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 = Thread::current_or_null_safe();
+
+ // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
+ // (no destructors can be run)
+ os::ThreadCrashProtection::check_crash_protection(sig, t);
+
+ SignalHandlerMark shm(t);
+
+ if(sig == SIGPIPE || sig == SIGXFSZ) {
+ if (os::Solaris::chained_handler(sig, info, ucVoid)) {
+ return true;
+ } else {
+ // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219
+ 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;
+ }
+ }
+ }
+
+ if (sig == ASYNC_SIGNAL) {
+ if(thread || vmthread){
+ OSThread::SR_handler(t, uc);
+ return true;
+ } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
+ return true;
+ } else {
+ // If ASYNC_SIGNAL 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)) {
+ os::Solaris::ucontext_set_pc(uc, 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_reserved_zone(addr)) {
+ if (thread->thread_state() == _thread_in_Java) {
+ if (thread->in_stack_reserved_zone(addr)) {
+ frame fr;
+ if (os::Solaris::get_frame_at_stack_banging_point(thread, uc, &fr)) {
+ assert(fr.is_java_frame(), "Must be Java frame");
+ frame activation = SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
+ if (activation.sp() != NULL) {
+ thread->disable_stack_reserved_zone();
+ if (activation.is_interpreted_frame()) {
+ thread->set_reserved_stack_activation((address)(
+ activation.fp() + frame::interpreter_frame_initial_sp_offset));
+ } else {
+ thread->set_reserved_stack_activation((address)activation.unextended_sp());
+ }
+ return true;
+ }
+ }
+ }
+ // Throw a stack overflow exception. Guard pages will be reenabled
+ // while unwinding the stack.
+ thread->disable_stack_yellow_reserved_zone();
+ 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.
+ thread->disable_stack_yellow_reserved_zone();
+ 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 ((sig == SIGSEGV) && VM_Version::is_cpuinfo_segv_addr(pc)) {
+ // Verify that OS save/restore AVX registers.
+ stub = VM_Version::cpuinfo_cont_addr();
+ }
+
+ if (thread->thread_state() == _thread_in_vm) {
+ if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
+ address next_pc = Assembler::locate_next_instruction(pc);
+ stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
+ }
+ }
+
+ 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);
+ if (cb != NULL) {
+ CompiledMethod* nm = cb->as_compiled_method_or_null();
+ if (nm != NULL && nm->has_unsafe_access()) {
+ address next_pc = Assembler::locate_next_instruction(pc);
+ stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
+ }
+ }
+ }
+ 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_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 = align_down(addr, page_size);
+ bool res = os::protect_memory((char*) page_start, page_size,
+ os::MEM_PROT_RWX);
+
+ log_debug(os)("Execution protection violation "
+ "at " INTPTR_FORMAT
+ ", unguarding " INTPTR_FORMAT ": %s, errno=%d", p2i(addr),
+ p2i(page_start), (res ? "success" : "failed"), errno);
+ 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
+ os::Solaris::ucontext_set_pc(uc, 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::report_and_die(t, sig, pc, info, ucVoid);
+
+ ShouldNotReachHere();
+ return false;
+}
+
+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:");
+#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, 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 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
+
+int os::extra_bang_size_in_bytes() {
+ // JDK-8050147 requires the full cache line bang for x86.
+ return VM_Version::L1_line_size();
+}