Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 1 | /* |
Coleen Phillimore | 0d3e797 | 2016-04-07 16:37:35 -0400 | [diff] [blame] | 2 | * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved. |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 3 | * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc. |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This code is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 only, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 21 | * or visit www.oracle.com if you need additional information or have any |
| 22 | * questions. |
| 23 | * |
| 24 | */ |
| 25 | |
Staffan Larsen | bcf7a3c | 2012-10-29 21:04:17 +0100 | [diff] [blame] | 26 | #if !defined(__APPLE__) && !defined(__NetBSD__) |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 27 | #include <pthread.h> |
| 28 | # include <pthread_np.h> /* For pthread_attr_get_np */ |
| 29 | #endif |
| 30 | |
| 31 | // no precompiled headers |
| 32 | #include "assembler_zero.inline.hpp" |
| 33 | #include "classfile/classLoader.hpp" |
| 34 | #include "classfile/systemDictionary.hpp" |
| 35 | #include "classfile/vmSymbols.hpp" |
| 36 | #include "code/icBuffer.hpp" |
| 37 | #include "code/vtableStubs.hpp" |
| 38 | #include "interpreter/interpreter.hpp" |
| 39 | #include "jvm_bsd.h" |
| 40 | #include "memory/allocation.inline.hpp" |
| 41 | #include "mutex_bsd.inline.hpp" |
| 42 | #include "nativeInst_zero.hpp" |
| 43 | #include "os_share_bsd.hpp" |
| 44 | #include "prims/jniFastGetField.hpp" |
| 45 | #include "prims/jvm.h" |
| 46 | #include "prims/jvm_misc.hpp" |
| 47 | #include "runtime/arguments.hpp" |
| 48 | #include "runtime/extendedPC.hpp" |
| 49 | #include "runtime/frame.inline.hpp" |
| 50 | #include "runtime/interfaceSupport.hpp" |
| 51 | #include "runtime/java.hpp" |
| 52 | #include "runtime/javaCalls.hpp" |
| 53 | #include "runtime/mutexLocker.hpp" |
| 54 | #include "runtime/osThread.hpp" |
| 55 | #include "runtime/sharedRuntime.hpp" |
| 56 | #include "runtime/stubRoutines.hpp" |
Stefan Karlsson | 57204d9 | 2012-11-27 14:20:21 +0100 | [diff] [blame] | 57 | #include "runtime/thread.inline.hpp" |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 58 | #include "runtime/timer.hpp" |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 59 | #include "utilities/events.hpp" |
| 60 | #include "utilities/vmError.hpp" |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 61 | |
Thomas Stuefe | 1afbc04 | 2015-03-31 05:30:36 -0400 | [diff] [blame] | 62 | // See stubGenerator_zero.cpp |
| 63 | #include <setjmp.h> |
| 64 | extern sigjmp_buf* get_jmp_buf_for_continuation(); |
| 65 | |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 66 | address os::current_stack_pointer() { |
| 67 | address dummy = (address) &dummy; |
| 68 | return dummy; |
| 69 | } |
| 70 | |
| 71 | frame os::get_sender_for_C_frame(frame* fr) { |
| 72 | ShouldNotCallThis(); |
Christian Thalinger | 9e056ee | 2013-08-20 10:57:50 -0700 | [diff] [blame] | 73 | return frame(); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | frame os::current_frame() { |
| 77 | // The only thing that calls this is the stack printing code in |
| 78 | // VMError::report: |
| 79 | // - Step 110 (printing stack bounds) uses the sp in the frame |
| 80 | // to determine the amount of free space on the stack. We |
| 81 | // set the sp to a close approximation of the real value in |
| 82 | // order to allow this step to complete. |
| 83 | // - Step 120 (printing native stack) tries to walk the stack. |
| 84 | // The frame we create has a NULL pc, which is ignored as an |
| 85 | // invalid frame. |
| 86 | frame dummy = frame(); |
| 87 | dummy.set_sp((intptr_t *) current_stack_pointer()); |
| 88 | return dummy; |
| 89 | } |
| 90 | |
| 91 | char* os::non_memory_address_word() { |
| 92 | // Must never look like an address returned by reserve_memory, |
| 93 | // even in its subfields (as defined by the CPU immediate fields, |
| 94 | // if the CPU splits constants across multiple instructions). |
| 95 | #ifdef SPARC |
| 96 | // On SPARC, 0 != %hi(any real address), because there is no |
| 97 | // allocation in the first 1Kb of the virtual address space. |
| 98 | return (char *) 0; |
| 99 | #else |
| 100 | // This is the value for x86; works pretty well for PPC too. |
| 101 | return (char *) -1; |
| 102 | #endif // SPARC |
| 103 | } |
| 104 | |
Zhengyu Gu | afd497e | 2012-09-17 10:20:04 -0400 | [diff] [blame] | 105 | void os::initialize_thread(Thread* thr) { |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 106 | // Nothing to do. |
| 107 | } |
| 108 | |
Thomas Stuefe | 0eda47f | 2015-12-14 02:29:11 -0500 | [diff] [blame] | 109 | address os::Bsd::ucontext_get_pc(const ucontext_t* uc) { |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 110 | ShouldNotCallThis(); |
Christian Thalinger | 9e056ee | 2013-08-20 10:57:50 -0700 | [diff] [blame] | 111 | return NULL; |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 112 | } |
| 113 | |
Thomas Stufe | 33690bd | 2015-03-12 19:34:50 -0400 | [diff] [blame] | 114 | void os::Bsd::ucontext_set_pc(ucontext_t * uc, address pc) { |
| 115 | ShouldNotCallThis(); |
| 116 | } |
| 117 | |
Thomas Stuefe | 0eda47f | 2015-12-14 02:29:11 -0500 | [diff] [blame] | 118 | ExtendedPC os::fetch_frame_from_context(const void* ucVoid, |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 119 | intptr_t** ret_sp, |
| 120 | intptr_t** ret_fp) { |
| 121 | ShouldNotCallThis(); |
Christian Thalinger | 9e056ee | 2013-08-20 10:57:50 -0700 | [diff] [blame] | 122 | return ExtendedPC(); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Thomas Stuefe | 0eda47f | 2015-12-14 02:29:11 -0500 | [diff] [blame] | 125 | frame os::fetch_frame_from_context(const void* ucVoid) { |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 126 | ShouldNotCallThis(); |
Christian Thalinger | 9e056ee | 2013-08-20 10:57:50 -0700 | [diff] [blame] | 127 | return frame(); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | extern "C" JNIEXPORT int |
| 131 | JVM_handle_bsd_signal(int sig, |
| 132 | siginfo_t* info, |
| 133 | void* ucVoid, |
| 134 | int abort_if_unrecognized) { |
| 135 | ucontext_t* uc = (ucontext_t*) ucVoid; |
| 136 | |
David Holmes | 6e0ea9d | 2015-12-04 04:06:37 -0500 | [diff] [blame] | 137 | Thread* t = Thread::current_or_null_safe(); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 138 | |
| 139 | SignalHandlerMark shm(t); |
| 140 | |
Thomas Stuefe | 1afbc04 | 2015-03-31 05:30:36 -0400 | [diff] [blame] | 141 | // handle SafeFetch faults |
| 142 | if (sig == SIGSEGV || sig == SIGBUS) { |
| 143 | sigjmp_buf* const pjb = get_jmp_buf_for_continuation(); |
| 144 | if (pjb) { |
| 145 | siglongjmp(*pjb, 1); |
| 146 | } |
| 147 | } |
| 148 | |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 149 | // Note: it's not uncommon that JNI code uses signal/sigset to |
| 150 | // install then restore certain signal handler (e.g. to temporarily |
| 151 | // block SIGPIPE, or have a SIGILL handler when detecting CPU |
| 152 | // type). When that happens, JVM_handle_bsd_signal() might be |
| 153 | // invoked with junk info/ucVoid. To avoid unnecessary crash when |
| 154 | // libjsig is not preloaded, try handle signals that do not require |
| 155 | // siginfo/ucontext first. |
| 156 | |
| 157 | if (sig == SIGPIPE || sig == SIGXFSZ) { |
| 158 | // allow chained handler to go first |
| 159 | if (os::Bsd::chained_handler(sig, info, ucVoid)) { |
| 160 | return true; |
| 161 | } else { |
Coleen Phillimore | 0d3e797 | 2016-04-07 16:37:35 -0400 | [diff] [blame] | 162 | // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 163 | return true; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | JavaThread* thread = NULL; |
| 168 | VMThread* vmthread = NULL; |
| 169 | if (os::Bsd::signal_handlers_are_installed) { |
| 170 | if (t != NULL ){ |
| 171 | if(t->is_Java_thread()) { |
| 172 | thread = (JavaThread*)t; |
| 173 | } |
| 174 | else if(t->is_VM_thread()){ |
| 175 | vmthread = (VMThread *)t; |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | if (info != NULL && thread != NULL) { |
| 181 | // Handle ALL stack overflow variations here |
Christos Zoulas | 32708ba | 2011-10-13 09:35:42 -0700 | [diff] [blame] | 182 | if (sig == SIGSEGV || sig == SIGBUS) { |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 183 | address addr = (address) info->si_addr; |
| 184 | |
| 185 | // check if fault address is within thread stack |
Goetz Lindenmaier | b5bca5c | 2015-12-20 10:37:23 -0500 | [diff] [blame] | 186 | if (thread->on_local_stack(addr)) { |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 187 | // stack overflow |
Goetz Lindenmaier | b5bca5c | 2015-12-20 10:37:23 -0500 | [diff] [blame] | 188 | if (thread->in_stack_yellow_reserved_zone(addr)) { |
| 189 | thread->disable_stack_yellow_reserved_zone(); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 190 | ShouldNotCallThis(); |
| 191 | } |
| 192 | else if (thread->in_stack_red_zone(addr)) { |
| 193 | thread->disable_stack_red_zone(); |
| 194 | ShouldNotCallThis(); |
| 195 | } |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 196 | } |
| 197 | } |
| 198 | |
| 199 | /*if (thread->thread_state() == _thread_in_Java) { |
| 200 | ShouldNotCallThis(); |
| 201 | } |
| 202 | else*/ if (thread->thread_state() == _thread_in_vm && |
| 203 | sig == SIGBUS && thread->doing_unsafe_access()) { |
| 204 | ShouldNotCallThis(); |
| 205 | } |
| 206 | |
| 207 | // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC |
| 208 | // kicks in and the heap gets shrunk before the field access. |
| 209 | /*if (sig == SIGSEGV || sig == SIGBUS) { |
| 210 | address addr = JNI_FastGetField::find_slowcase_pc(pc); |
| 211 | if (addr != (address)-1) { |
| 212 | stub = addr; |
| 213 | } |
| 214 | }*/ |
| 215 | |
| 216 | // Check to see if we caught the safepoint code in the process |
| 217 | // of write protecting the memory serialization page. It write |
| 218 | // enables the page immediately after protecting it so we can |
| 219 | // just return to retry the write. |
Christos Zoulas | 32708ba | 2011-10-13 09:35:42 -0700 | [diff] [blame] | 220 | if ((sig == SIGSEGV || sig == SIGBUS) && |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 221 | os::is_memory_serialize_page(thread, (address) info->si_addr)) { |
| 222 | // Block current thread until permission is restored. |
| 223 | os::block_on_serialize_page_trap(); |
| 224 | return true; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | // signal-chaining |
| 229 | if (os::Bsd::chained_handler(sig, info, ucVoid)) { |
| 230 | return true; |
| 231 | } |
| 232 | |
| 233 | if (!abort_if_unrecognized) { |
| 234 | // caller wants another chance, so give it to him |
| 235 | return false; |
| 236 | } |
| 237 | |
| 238 | #ifndef PRODUCT |
| 239 | if (sig == SIGSEGV) { |
| 240 | fatal("\n#" |
| 241 | "\n# /--------------------\\" |
| 242 | "\n# | segmentation fault |" |
| 243 | "\n# \\---\\ /--------------/" |
| 244 | "\n# /" |
| 245 | "\n# [-] |\\_/| " |
| 246 | "\n# (+)=C |o o|__ " |
| 247 | "\n# | | =-*-=__\\ " |
| 248 | "\n# OOO c_c_(___)"); |
| 249 | } |
| 250 | #endif // !PRODUCT |
| 251 | |
Christos Zoulas | 32708ba | 2011-10-13 09:35:42 -0700 | [diff] [blame] | 252 | const char *fmt = |
| 253 | "caught unhandled signal " INT32_FORMAT " at address " PTR_FORMAT; |
| 254 | char buf[128]; |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 255 | |
Christos Zoulas | 32708ba | 2011-10-13 09:35:42 -0700 | [diff] [blame] | 256 | sprintf(buf, fmt, sig, info->si_addr); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 257 | fatal(buf); |
Christian Thalinger | 9e056ee | 2013-08-20 10:57:50 -0700 | [diff] [blame] | 258 | return false; |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 259 | } |
| 260 | |
| 261 | void os::Bsd::init_thread_fpu_state(void) { |
| 262 | // Nothing to do |
| 263 | } |
| 264 | |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 265 | bool os::is_allocatable(size_t bytes) { |
| 266 | #ifdef _LP64 |
| 267 | return true; |
| 268 | #else |
| 269 | if (bytes < 2 * G) { |
| 270 | return true; |
| 271 | } |
| 272 | |
| 273 | char* addr = reserve_memory(bytes, NULL); |
| 274 | |
| 275 | if (addr != NULL) { |
| 276 | release_memory(addr, bytes); |
| 277 | } |
| 278 | |
| 279 | return addr != NULL; |
| 280 | #endif // _LP64 |
| 281 | } |
| 282 | |
| 283 | /////////////////////////////////////////////////////////////////////////////// |
| 284 | // thread stack |
| 285 | |
| 286 | size_t os::Bsd::min_stack_allowed = 64 * K; |
| 287 | |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 288 | size_t os::Bsd::default_stack_size(os::ThreadType thr_type) { |
| 289 | #ifdef _LP64 |
| 290 | size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); |
| 291 | #else |
| 292 | size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); |
| 293 | #endif // _LP64 |
| 294 | return s; |
| 295 | } |
| 296 | |
| 297 | size_t os::Bsd::default_guard_size(os::ThreadType thr_type) { |
| 298 | // Only enable glibc guard pages for non-Java threads |
| 299 | // (Java threads have HotSpot guard pages) |
| 300 | return (thr_type == java_thread ? 0 : page_size()); |
| 301 | } |
| 302 | |
| 303 | static void current_stack_region(address *bottom, size_t *size) { |
| 304 | address stack_bottom; |
| 305 | address stack_top; |
| 306 | size_t stack_bytes; |
| 307 | |
| 308 | #ifdef __APPLE__ |
| 309 | pthread_t self = pthread_self(); |
| 310 | stack_top = (address) pthread_get_stackaddr_np(self); |
| 311 | stack_bytes = pthread_get_stacksize_np(self); |
| 312 | stack_bottom = stack_top - stack_bytes; |
| 313 | #elif defined(__OpenBSD__) |
| 314 | stack_t ss; |
| 315 | int rslt = pthread_stackseg_np(pthread_self(), &ss); |
| 316 | |
| 317 | if (rslt != 0) |
David Lindholm | 1e71f67 | 2015-09-29 11:02:08 +0200 | [diff] [blame] | 318 | fatal("pthread_stackseg_np failed with err = " INT32_FORMAT, rslt); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 319 | |
| 320 | stack_top = (address) ss.ss_sp; |
| 321 | stack_bytes = ss.ss_size; |
| 322 | stack_bottom = stack_top - stack_bytes; |
Staffan Larsen | bcf7a3c | 2012-10-29 21:04:17 +0100 | [diff] [blame] | 323 | #else |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 324 | pthread_attr_t attr; |
| 325 | |
| 326 | int rslt = pthread_attr_init(&attr); |
| 327 | |
| 328 | // JVM needs to know exact stack location, abort if it fails |
| 329 | if (rslt != 0) |
David Lindholm | 1e71f67 | 2015-09-29 11:02:08 +0200 | [diff] [blame] | 330 | fatal("pthread_attr_init failed with err = " INT32_FORMAT, rslt); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 331 | |
| 332 | rslt = pthread_attr_get_np(pthread_self(), &attr); |
| 333 | |
| 334 | if (rslt != 0) |
David Lindholm | 1e71f67 | 2015-09-29 11:02:08 +0200 | [diff] [blame] | 335 | fatal("pthread_attr_get_np failed with err = " INT32_FORMAT, rslt); |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 336 | |
| 337 | if (pthread_attr_getstackaddr(&attr, (void **) &stack_bottom) != 0 || |
| 338 | pthread_attr_getstacksize(&attr, &stack_bytes) != 0) { |
| 339 | fatal("Can not locate current stack attributes!"); |
| 340 | } |
| 341 | |
| 342 | pthread_attr_destroy(&attr); |
| 343 | |
| 344 | stack_top = stack_bottom + stack_bytes; |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 345 | #endif |
| 346 | |
| 347 | assert(os::current_stack_pointer() >= stack_bottom, "should do"); |
| 348 | assert(os::current_stack_pointer() < stack_top, "should do"); |
| 349 | |
| 350 | *bottom = stack_bottom; |
| 351 | *size = stack_top - stack_bottom; |
| 352 | } |
| 353 | |
| 354 | address os::current_stack_base() { |
| 355 | address bottom; |
| 356 | size_t size; |
| 357 | current_stack_region(&bottom, &size); |
| 358 | return bottom + size; |
| 359 | } |
| 360 | |
| 361 | size_t os::current_stack_size() { |
| 362 | // stack size includes normal stack and HotSpot guard pages |
| 363 | address bottom; |
| 364 | size_t size; |
| 365 | current_stack_region(&bottom, &size); |
| 366 | return size; |
| 367 | } |
| 368 | |
| 369 | ///////////////////////////////////////////////////////////////////////////// |
| 370 | // helper functions for fatal error handler |
| 371 | |
Thomas Stuefe | 0eda47f | 2015-12-14 02:29:11 -0500 | [diff] [blame] | 372 | void os::print_context(outputStream* st, const void* context) { |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 373 | ShouldNotCallThis(); |
| 374 | } |
| 375 | |
Thomas Stuefe | 0eda47f | 2015-12-14 02:29:11 -0500 | [diff] [blame] | 376 | void os::print_register_info(outputStream *st, const void *context) { |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 377 | ShouldNotCallThis(); |
| 378 | } |
| 379 | |
| 380 | ///////////////////////////////////////////////////////////////////////////// |
| 381 | // Stubs for things that would be in bsd_zero.s if it existed. |
| 382 | // You probably want to disassemble these monkeys to check they're ok. |
| 383 | |
| 384 | extern "C" { |
| 385 | int SpinPause() { |
Christian Thalinger | 9e056ee | 2013-08-20 10:57:50 -0700 | [diff] [blame] | 386 | return 1; |
Kurt Miller | 95c56a4 | 2011-09-25 16:03:29 -0700 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { |
| 390 | if (from > to) { |
| 391 | jshort *end = from + count; |
| 392 | while (from < end) |
| 393 | *(to++) = *(from++); |
| 394 | } |
| 395 | else if (from < to) { |
| 396 | jshort *end = from; |
| 397 | from += count - 1; |
| 398 | to += count - 1; |
| 399 | while (from >= end) |
| 400 | *(to--) = *(from--); |
| 401 | } |
| 402 | } |
| 403 | void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { |
| 404 | if (from > to) { |
| 405 | jint *end = from + count; |
| 406 | while (from < end) |
| 407 | *(to++) = *(from++); |
| 408 | } |
| 409 | else if (from < to) { |
| 410 | jint *end = from; |
| 411 | from += count - 1; |
| 412 | to += count - 1; |
| 413 | while (from >= end) |
| 414 | *(to--) = *(from--); |
| 415 | } |
| 416 | } |
| 417 | void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { |
| 418 | if (from > to) { |
| 419 | jlong *end = from + count; |
| 420 | while (from < end) |
| 421 | os::atomic_copy64(from++, to++); |
| 422 | } |
| 423 | else if (from < to) { |
| 424 | jlong *end = from; |
| 425 | from += count - 1; |
| 426 | to += count - 1; |
| 427 | while (from >= end) |
| 428 | os::atomic_copy64(from--, to--); |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | void _Copy_arrayof_conjoint_bytes(HeapWord* from, |
| 433 | HeapWord* to, |
| 434 | size_t count) { |
| 435 | memmove(to, from, count); |
| 436 | } |
| 437 | void _Copy_arrayof_conjoint_jshorts(HeapWord* from, |
| 438 | HeapWord* to, |
| 439 | size_t count) { |
| 440 | memmove(to, from, count * 2); |
| 441 | } |
| 442 | void _Copy_arrayof_conjoint_jints(HeapWord* from, |
| 443 | HeapWord* to, |
| 444 | size_t count) { |
| 445 | memmove(to, from, count * 4); |
| 446 | } |
| 447 | void _Copy_arrayof_conjoint_jlongs(HeapWord* from, |
| 448 | HeapWord* to, |
| 449 | size_t count) { |
| 450 | memmove(to, from, count * 8); |
| 451 | } |
| 452 | }; |
| 453 | |
| 454 | ///////////////////////////////////////////////////////////////////////////// |
| 455 | // Implementations of atomic operations not supported by processors. |
| 456 | // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html |
| 457 | |
| 458 | #ifndef _LP64 |
| 459 | extern "C" { |
| 460 | long long unsigned int __sync_val_compare_and_swap_8( |
| 461 | volatile void *ptr, |
| 462 | long long unsigned int oldval, |
| 463 | long long unsigned int newval) { |
| 464 | ShouldNotCallThis(); |
| 465 | } |
| 466 | }; |
| 467 | #endif // !_LP64 |
Roland Westrelin | 4012f6c | 2012-02-27 09:17:44 +0100 | [diff] [blame] | 468 | |
| 469 | #ifndef PRODUCT |
| 470 | void os::verify_stack_alignment() { |
| 471 | } |
| 472 | #endif |
Aleksey Shipilev | 13329b5 | 2014-09-04 13:11:25 +0400 | [diff] [blame] | 473 | |
| 474 | int os::extra_bang_size_in_bytes() { |
| 475 | // Zero does not require an additional stack bang. |
| 476 | return 0; |
| 477 | } |