os_linux_sparc.cpp revision 7996:3eb61269f421
185342Simp/* 285342Simp * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 385342Simp * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 485342Simp * 585342Simp * This code is free software; you can redistribute it and/or modify it 685342Simp * under the terms of the GNU General Public License version 2 only, as 785342Simp * published by the Free Software Foundation. 885342Simp * 985342Simp * This code is distributed in the hope that it will be useful, but WITHOUT 1085342Simp * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1185342Simp * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1285342Simp * version 2 for more details (a copy is included in the LICENSE file that 1385342Simp * accompanied this code). 1485342Simp * 1585342Simp * You should have received a copy of the GNU General Public License version 1685342Simp * 2 along with this work; if not, write to the Free Software Foundation, 1785342Simp * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1885342Simp * 1985342Simp * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2085342Simp * or visit www.oracle.com if you need additional information or have any 2185342Simp * questions. 2285342Simp * 2385342Simp */ 2485342Simp 2585342Simp// no precompiled headers 2685342Simp#include "asm/macroAssembler.hpp" 2785342Simp#include "classfile/classLoader.hpp" 2885342Simp#include "classfile/systemDictionary.hpp" 2985342Simp#include "classfile/vmSymbols.hpp" 3085342Simp#include "code/icBuffer.hpp" 3185342Simp#include "code/vtableStubs.hpp" 3285342Simp#include "interpreter/interpreter.hpp" 3385342Simp#include "jvm_linux.h" 3485342Simp#include "memory/allocation.inline.hpp" 3585342Simp#include "mutex_linux.inline.hpp" 3685342Simp#include "nativeInst_sparc.hpp" 3785342Simp#include "os_share_linux.hpp" 3885342Simp#include "prims/jniFastGetField.hpp" 3986214Sru#include "prims/jvm.h" 4085342Simp#include "prims/jvm_misc.hpp" 4186214Sru#include "runtime/arguments.hpp" 4286214Sru#include "runtime/extendedPC.hpp" 4386214Sru#include "runtime/frame.inline.hpp" 4486214Sru#include "runtime/interfaceSupport.hpp" 4586214Sru#include "runtime/java.hpp" 4686214Sru#include "runtime/javaCalls.hpp" 4786214Sru#include "runtime/mutexLocker.hpp" 4886214Sru#include "runtime/osThread.hpp" 4985342Simp#include "runtime/sharedRuntime.hpp" 5085342Simp#include "runtime/stubRoutines.hpp" 5185342Simp#include "runtime/thread.inline.hpp" 5285342Simp#include "runtime/timer.hpp" 5385342Simp#include "utilities/events.hpp" 5485342Simp#include "utilities/vmError.hpp" 5585342Simp 5685342Simp// Linux/Sparc has rather obscure naming of registers in sigcontext 5785342Simp// different between 32 and 64 bits 5885342Simp#ifdef _LP64 5986214Sru#define SIG_PC(x) ((x)->sigc_regs.tpc) 6086214Sru#define SIG_NPC(x) ((x)->sigc_regs.tnpc) 6185342Simp#define SIG_REGS(x) ((x)->sigc_regs) 6285342Simp#else 6385342Simp#define SIG_PC(x) ((x)->si_regs.pc) 6485342Simp#define SIG_NPC(x) ((x)->si_regs.npc) 6585342Simp#define SIG_REGS(x) ((x)->si_regs) 6685342Simp#endif 6785342Simp 6885342Simp// those are to reference registers in sigcontext 6985342Simpenum { 7085342Simp CON_G0 = 0, 7185342Simp CON_G1, 7285342Simp CON_G2, 7385342Simp CON_G3, 7485342Simp CON_G4, 7586214Sru CON_G5, 7685342Simp CON_G6, 7786214Sru CON_G7, 78108087Sru CON_O0, 7985342Simp CON_O1, 80108087Sru CON_O2, 8185342Simp CON_O3, 8285342Simp CON_O4, 8385342Simp CON_O5, 8485342Simp CON_O6, 8585342Simp CON_O7, 8686214Sru}; 8785342Simp 8885342Simp// For Forte Analyzer AsyncGetCallTrace profiling support - thread is 8985342Simp// currently interrupted by SIGPROF. 90107619Sru// os::Solaris::fetch_frame_from_ucontext() tries to skip nested 91107619Sru// signal frames. Currently we don't do that on Linux, so it's the 92107619Sru// same as os::fetch_frame_from_context(). 93107619SruExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 9486214Sru ucontext_t* uc, 9585342Simp intptr_t** ret_sp, 9685342Simp intptr_t** ret_fp) { 9785342Simp assert(thread != NULL, "just checking"); 9885342Simp assert(ret_sp != NULL, "just checking"); 9986214Sru assert(ret_fp != NULL, "just checking"); 10086214Sru 10185342Simp return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 10285342Simp} 10385342Simp 10485342SimpExtendedPC os::fetch_frame_from_context(void* ucVoid, 10585342Simp intptr_t** ret_sp, 10685342Simp intptr_t** ret_fp) { 10785342Simp ucontext_t* uc = (ucontext_t*) ucVoid; 10885342Simp ExtendedPC epc; 10985342Simp 11086214Sru if (uc != NULL) { 11186214Sru epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 11297924Ssheldonh if (ret_sp) { 113140505Sru *ret_sp = os::Linux::ucontext_get_sp(uc); 114140505Sru } 115140505Sru if (ret_fp) { 116140505Sru *ret_fp = (intptr_t*)NULL; 117 } 118 } else { 119 // construct empty ExtendedPC for return value checking 120 epc = ExtendedPC(NULL); 121 if (ret_sp) { 122 *ret_sp = (intptr_t*) NULL; 123 } 124 if (ret_fp) { 125 *ret_fp = (intptr_t*) NULL; 126 } 127 } 128 129 return epc; 130} 131 132frame os::fetch_frame_from_context(void* ucVoid) { 133 intptr_t* sp; 134 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL); 135 return frame(sp, frame::unpatchable, epc.pc()); 136} 137 138frame os::get_sender_for_C_frame(frame* fr) { 139 return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); 140} 141 142frame os::current_frame() { 143 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 144 frame myframe(sp, frame::unpatchable, 145 CAST_FROM_FN_PTR(address, os::current_frame)); 146 if (os::is_first_C_frame(&myframe)) { 147 // stack is not walkable 148 return frame(NULL, frame::unpatchable, NULL); 149 } else { 150 return os::get_sender_for_C_frame(&myframe); 151 } 152} 153 154address os::current_stack_pointer() { 155 register void *sp __asm__ ("sp"); 156 return (address)sp; 157} 158 159static void current_stack_region(address* bottom, size_t* size) { 160 if (os::Linux::is_initial_thread()) { 161 // initial thread needs special handling because pthread_getattr_np() 162 // may return bogus value. 163 *bottom = os::Linux::initial_thread_stack_bottom(); 164 *size = os::Linux::initial_thread_stack_size(); 165 } else { 166 pthread_attr_t attr; 167 168 int rslt = pthread_getattr_np(pthread_self(), &attr); 169 170 // JVM needs to know exact stack location, abort if it fails 171 if (rslt != 0) { 172 if (rslt == ENOMEM) { 173 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); 174 } else { 175 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); 176 } 177 } 178 179 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { 180 fatal("Can not locate current stack attributes!"); 181 } 182 183 pthread_attr_destroy(&attr); 184 } 185 assert(os::current_stack_pointer() >= *bottom && 186 os::current_stack_pointer() < *bottom + *size, "just checking"); 187} 188 189address os::current_stack_base() { 190 address bottom; 191 size_t size; 192 current_stack_region(&bottom, &size); 193 return bottom + size; 194} 195 196size_t os::current_stack_size() { 197 // stack size includes normal stack and HotSpot guard pages 198 address bottom; 199 size_t size; 200 current_stack_region(&bottom, &size); 201 return size; 202} 203 204char* os::non_memory_address_word() { 205 // Must never look like an address returned by reserve_memory, 206 // even in its subfields (as defined by the CPU immediate fields, 207 // if the CPU splits constants across multiple instructions). 208 // On SPARC, 0 != %hi(any real address), because there is no 209 // allocation in the first 1Kb of the virtual address space. 210 return (char*) 0; 211} 212 213void os::initialize_thread(Thread* thr) {} 214 215void os::print_context(outputStream *st, void *context) { 216 if (context == NULL) return; 217 218 ucontext_t* uc = (ucontext_t*)context; 219 sigcontext* sc = (sigcontext*)context; 220 st->print_cr("Registers:"); 221 222 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT 223 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, 224 SIG_REGS(sc).u_regs[CON_G1], 225 SIG_REGS(sc).u_regs[CON_G2], 226 SIG_REGS(sc).u_regs[CON_G3], 227 SIG_REGS(sc).u_regs[CON_G4]); 228 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT 229 " G7=" INTPTR_FORMAT " Y=0x%x", 230 SIG_REGS(sc).u_regs[CON_G5], 231 SIG_REGS(sc).u_regs[CON_G6], 232 SIG_REGS(sc).u_regs[CON_G7], 233 SIG_REGS(sc).y); 234 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT 235 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, 236 SIG_REGS(sc).u_regs[CON_O0], 237 SIG_REGS(sc).u_regs[CON_O1], 238 SIG_REGS(sc).u_regs[CON_O2], 239 SIG_REGS(sc).u_regs[CON_O3]); 240 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT 241 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, 242 SIG_REGS(sc).u_regs[CON_O4], 243 SIG_REGS(sc).u_regs[CON_O5], 244 SIG_REGS(sc).u_regs[CON_O6], 245 SIG_REGS(sc).u_regs[CON_O7]); 246 247 248 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 249 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT 250 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, 251 sp[L0->sp_offset_in_saved_window()], 252 sp[L1->sp_offset_in_saved_window()], 253 sp[L2->sp_offset_in_saved_window()], 254 sp[L3->sp_offset_in_saved_window()]); 255 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT 256 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, 257 sp[L4->sp_offset_in_saved_window()], 258 sp[L5->sp_offset_in_saved_window()], 259 sp[L6->sp_offset_in_saved_window()], 260 sp[L7->sp_offset_in_saved_window()]); 261 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT 262 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, 263 sp[I0->sp_offset_in_saved_window()], 264 sp[I1->sp_offset_in_saved_window()], 265 sp[I2->sp_offset_in_saved_window()], 266 sp[I3->sp_offset_in_saved_window()]); 267 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT 268 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, 269 sp[I4->sp_offset_in_saved_window()], 270 sp[I5->sp_offset_in_saved_window()], 271 sp[I6->sp_offset_in_saved_window()], 272 sp[I7->sp_offset_in_saved_window()]); 273 274 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, 275 SIG_PC(sc), 276 SIG_NPC(sc)); 277 st->cr(); 278 st->cr(); 279 280 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); 281 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); 282 st->cr(); 283 284 // Note: it may be unsafe to inspect memory near pc. For example, pc may 285 // point to garbage if entry point in an nmethod is corrupted. Leave 286 // this at the end, and hope for the best. 287 address pc = os::Linux::ucontext_get_pc(uc); 288 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc)); 289 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 290} 291 292 293void os::print_register_info(outputStream *st, void *context) { 294 if (context == NULL) return; 295 296 ucontext_t *uc = (ucontext_t*)context; 297 sigcontext* sc = (sigcontext*)context; 298 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 299 300 st->print_cr("Register to memory mapping:"); 301 st->cr(); 302 303 // this is only for the "general purpose" registers 304 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); 305 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); 306 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); 307 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); 308 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); 309 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); 310 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); 311 st->cr(); 312 313 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); 314 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); 315 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); 316 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); 317 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); 318 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); 319 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); 320 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); 321 st->cr(); 322 323 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); 324 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); 325 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); 326 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); 327 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); 328 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); 329 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); 330 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); 331 st->cr(); 332 333 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); 334 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); 335 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); 336 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); 337 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); 338 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); 339 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); 340 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); 341 st->cr(); 342} 343 344 345address os::Linux::ucontext_get_pc(ucontext_t* uc) { 346 return (address) SIG_PC((sigcontext*)uc); 347} 348 349void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { 350 sigcontext_t* ctx = (sigcontext_t*) uc; 351 SIG_PC(ctx) = (intptr_t)addr; 352 SIG_NPC(ctx) = (intptr_t)(addr+4); 353} 354 355intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { 356 return (intptr_t*) 357 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); 358} 359 360// not used on Sparc 361intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { 362 ShouldNotReachHere(); 363 return NULL; 364} 365 366// Utility functions 367 368inline static bool checkPrefetch(sigcontext* uc, address pc) { 369 if (StubRoutines::is_safefetch_fault(pc)) { 370 os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc)); 371 return true; 372 } 373 return false; 374} 375 376inline static bool checkOverflow(sigcontext* uc, 377 address pc, 378 address addr, 379 JavaThread* thread, 380 address* stub) { 381 // check if fault address is within thread stack 382 if (addr < thread->stack_base() && 383 addr >= thread->stack_base() - thread->stack_size()) { 384 // stack overflow 385 if (thread->in_stack_yellow_zone(addr)) { 386 thread->disable_stack_yellow_zone(); 387 if (thread->thread_state() == _thread_in_Java) { 388 // Throw a stack overflow exception. Guard pages will be reenabled 389 // while unwinding the stack. 390 *stub = 391 SharedRuntime::continuation_for_implicit_exception(thread, 392 pc, 393 SharedRuntime::STACK_OVERFLOW); 394 } else { 395 // Thread was in the vm or native code. Return and try to finish. 396 return true; 397 } 398 } else if (thread->in_stack_red_zone(addr)) { 399 // Fatal red zone violation. Disable the guard pages and fall through 400 // to handle_unexpected_exception way down below. 401 thread->disable_stack_red_zone(); 402 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 403 404 // This is a likely cause, but hard to verify. Let's just print 405 // it as a hint. 406 tty->print_raw_cr("Please check if any of your loaded .so files has " 407 "enabled executable stack (see man page execstack(8))"); 408 } else { 409 // Accessing stack address below sp may cause SEGV if current 410 // thread has MAP_GROWSDOWN stack. This should only happen when 411 // current thread was created by user code with MAP_GROWSDOWN flag 412 // and then attached to VM. See notes in os_linux.cpp. 413 if (thread->osthread()->expanding_stack() == 0) { 414 thread->osthread()->set_expanding_stack(); 415 if (os::Linux::manually_expand_stack(thread, addr)) { 416 thread->osthread()->clear_expanding_stack(); 417 return true; 418 } 419 thread->osthread()->clear_expanding_stack(); 420 } else { 421 fatal("recursive segv. expanding stack."); 422 } 423 } 424 } 425 return false; 426} 427 428inline static bool checkPollingPage(address pc, address fault, address* stub) { 429 if (fault == os::get_polling_page()) { 430 *stub = SharedRuntime::get_poll_stub(pc); 431 return true; 432 } 433 return false; 434} 435 436inline static bool checkByteBuffer(address pc, address* stub) { 437 // BugId 4454115: A read from a MappedByteBuffer can fault 438 // here if the underlying file has been truncated. 439 // Do not crash the VM in such a case. 440 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 441 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; 442 if (nm != NULL && nm->has_unsafe_access()) { 443 *stub = StubRoutines::handler_for_unsafe_access(); 444 return true; 445 } 446 return false; 447} 448 449inline static bool checkVerifyOops(address pc, address fault, address* stub) { 450 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] 451 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { 452 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; 453 warning("fixed up memory fault in +VerifyOops at address " 454 INTPTR_FORMAT, p2i(fault)); 455 return true; 456 } 457 return false; 458} 459 460inline static bool checkFPFault(address pc, int code, 461 JavaThread* thread, address* stub) { 462 if (code == FPE_INTDIV || code == FPE_FLTDIV) { 463 *stub = 464 SharedRuntime:: 465 continuation_for_implicit_exception(thread, 466 pc, 467 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 468 return true; 469 } 470 return false; 471} 472 473inline static bool checkNullPointer(address pc, intptr_t fault, 474 JavaThread* thread, address* stub) { 475 if (!MacroAssembler::needs_explicit_null_check(fault)) { 476 // Determination of interpreter/vtable stub/compiled code null 477 // exception 478 *stub = 479 SharedRuntime:: 480 continuation_for_implicit_exception(thread, pc, 481 SharedRuntime::IMPLICIT_NULL); 482 return true; 483 } 484 return false; 485} 486 487inline static bool checkFastJNIAccess(address pc, address* stub) { 488 address addr = JNI_FastGetField::find_slowcase_pc(pc); 489 if (addr != (address)-1) { 490 *stub = addr; 491 return true; 492 } 493 return false; 494} 495 496inline static bool checkSerializePage(JavaThread* thread, address addr) { 497 return os::is_memory_serialize_page(thread, addr); 498} 499 500inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { 501 if (nativeInstruction_at(*pc)->is_zombie()) { 502 // zombie method (ld [%g0],%o7 instruction) 503 *stub = SharedRuntime::get_handle_wrong_method_stub(); 504 505 // At the stub it needs to look like a call from the caller of this 506 // method (not a call from the segv site). 507 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 508 return true; 509 } 510 return false; 511} 512 513inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { 514#ifdef COMPILER2 515 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { 516#ifdef ASSERT 517#ifdef TIERED 518 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); 519 assert(cb->is_compiled_by_c2(), "Wrong compiler"); 520#endif // TIERED 521#endif // ASSERT 522 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. 523 *stub = SharedRuntime::get_ic_miss_stub(); 524 // At the stub it needs to look like a call from the caller of this 525 // method (not a call from the segv site). 526 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 527 return true; 528 } 529#endif // COMPILER2 530 return false; 531} 532 533extern "C" JNIEXPORT int 534JVM_handle_linux_signal(int sig, 535 siginfo_t* info, 536 void* ucVoid, 537 int abort_if_unrecognized) { 538 // in fact this isn't ucontext_t* at all, but struct sigcontext* 539 // but Linux porting layer uses ucontext_t, so to minimize code change 540 // we cast as needed 541 ucontext_t* ucFake = (ucontext_t*) ucVoid; 542 sigcontext* uc = (sigcontext*)ucVoid; 543 544 Thread* t = ThreadLocalStorage::get_thread_slow(); 545 546 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 547 // (no destructors can be run) 548 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 549 550 SignalHandlerMark shm(t); 551 552 // Note: it's not uncommon that JNI code uses signal/sigset to install 553 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 554 // or have a SIGILL handler when detecting CPU type). When that happens, 555 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 556 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 557 // that do not require siginfo/ucontext first. 558 559 if (sig == SIGPIPE || sig == SIGXFSZ) { 560 // allow chained handler to go first 561 if (os::Linux::chained_handler(sig, info, ucVoid)) { 562 return true; 563 } else { 564 if (PrintMiscellaneous && (WizardMode || Verbose)) { 565 char buf[64]; 566 warning("Ignoring %s - see bugs 4229104 or 646499219", 567 os::exception_name(sig, buf, sizeof(buf))); 568 } 569 return true; 570 } 571 } 572 573 JavaThread* thread = NULL; 574 VMThread* vmthread = NULL; 575 if (os::Linux::signal_handlers_are_installed) { 576 if (t != NULL ){ 577 if(t->is_Java_thread()) { 578 thread = (JavaThread*)t; 579 } 580 else if(t->is_VM_thread()){ 581 vmthread = (VMThread *)t; 582 } 583 } 584 } 585 586 // decide if this trap can be handled by a stub 587 address stub = NULL; 588 address pc = NULL; 589 address npc = NULL; 590 591 //%note os_trap_1 592 if (info != NULL && uc != NULL && thread != NULL) { 593 pc = address(SIG_PC(uc)); 594 npc = address(SIG_NPC(uc)); 595 596 // Check to see if we caught the safepoint code in the 597 // process of write protecting the memory serialization page. 598 // It write enables the page immediately after protecting it 599 // so we can just return to retry the write. 600 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { 601 // Block current thread until the memory serialize page permission restored. 602 os::block_on_serialize_page_trap(); 603 return 1; 604 } 605 606 if (checkPrefetch(uc, pc)) { 607 return 1; 608 } 609 610 // Handle ALL stack overflow variations here 611 if (sig == SIGSEGV) { 612 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { 613 return 1; 614 } 615 } 616 617 if (sig == SIGBUS && 618 thread->thread_state() == _thread_in_vm && 619 thread->doing_unsafe_access()) { 620 stub = StubRoutines::handler_for_unsafe_access(); 621 } 622 623 if (thread->thread_state() == _thread_in_Java) { 624 do { 625 // Java thread running in Java code => find exception handler if any 626 // a fault inside compiled code, the interpreter, or a stub 627 628 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { 629 break; 630 } 631 632 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { 633 break; 634 } 635 636 if ((sig == SIGSEGV || sig == SIGBUS) && 637 checkVerifyOops(pc, (address)info->si_addr, &stub)) { 638 break; 639 } 640 641 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { 642 break; 643 } 644 645 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { 646 break; 647 } 648 649 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { 650 break; 651 } 652 653 if ((sig == SIGSEGV) && 654 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { 655 break; 656 } 657 } while (0); 658 659 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 660 // and the heap gets shrunk before the field access. 661 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 662 checkFastJNIAccess(pc, &stub); 663 } 664 } 665 666 if (stub != NULL) { 667 // save all thread context in case we need to restore it 668 thread->set_saved_exception_pc(pc); 669 thread->set_saved_exception_npc(npc); 670 os::Linux::ucontext_set_pc((ucontext_t*)uc, stub); 671 return true; 672 } 673 } 674 675 // signal-chaining 676 if (os::Linux::chained_handler(sig, info, ucVoid)) { 677 return true; 678 } 679 680 if (!abort_if_unrecognized) { 681 // caller wants another chance, so give it to him 682 return false; 683 } 684 685 if (pc == NULL && uc != NULL) { 686 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); 687 } 688 689 // unmask current signal 690 sigset_t newset; 691 sigemptyset(&newset); 692 sigaddset(&newset, sig); 693 sigprocmask(SIG_UNBLOCK, &newset, NULL); 694 695 VMError err(t, sig, pc, info, ucVoid); 696 err.report_and_die(); 697 698 ShouldNotReachHere(); 699} 700 701void os::Linux::init_thread_fpu_state(void) { 702 // Nothing to do 703} 704 705int os::Linux::get_fpu_control_word() { 706 return 0; 707} 708 709void os::Linux::set_fpu_control_word(int fpu) { 710 // nothing 711} 712 713bool os::is_allocatable(size_t bytes) { 714#ifdef _LP64 715 return true; 716#else 717 if (bytes < 2 * G) { 718 return true; 719 } 720 721 char* addr = reserve_memory(bytes, NULL); 722 723 if (addr != NULL) { 724 release_memory(addr, bytes); 725 } 726 727 return addr != NULL; 728#endif // _LP64 729} 730 731/////////////////////////////////////////////////////////////////////////////// 732// thread stack 733 734size_t os::Linux::min_stack_allowed = 128 * K; 735 736// pthread on Ubuntu is always in floating stack mode 737bool os::Linux::supports_variable_stack_size() { return true; } 738 739// return default stack size for thr_type 740size_t os::Linux::default_stack_size(os::ThreadType thr_type) { 741 // default stack size (compiler thread needs larger stack) 742 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 743 return s; 744} 745 746size_t os::Linux::default_guard_size(os::ThreadType thr_type) { 747 // Creating guard page is very expensive. Java thread has HotSpot 748 // guard page, only enable glibc guard page for non-Java threads. 749 return (thr_type == java_thread ? 0 : page_size()); 750} 751 752#ifndef PRODUCT 753void os::verify_stack_alignment() { 754} 755#endif 756 757int os::extra_bang_size_in_bytes() { 758 // SPARC does not require the additional stack bang. 759 return 0; 760} 761