Mercurial > hg > truffle
annotate src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp @ 18041:52b4284cb496
Merge with jdk8u20-b26
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 16:02:50 +0200 |
| parents | 89152779163c 7f77d17d0f13 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 133 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| 133 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 133 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 // no precompiled headers |
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26 #include "asm/macroAssembler.hpp" |
| 1972 | 27 #include "classfile/classLoader.hpp" |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/icBuffer.hpp" | |
| 31 #include "code/vtableStubs.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "jvm_linux.h" | |
| 34 #include "memory/allocation.inline.hpp" | |
| 35 #include "mutex_linux.inline.hpp" | |
| 36 #include "nativeInst_sparc.hpp" | |
| 37 #include "os_share_linux.hpp" | |
| 38 #include "prims/jniFastGetField.hpp" | |
| 39 #include "prims/jvm.h" | |
| 40 #include "prims/jvm_misc.hpp" | |
| 41 #include "runtime/arguments.hpp" | |
| 42 #include "runtime/extendedPC.hpp" | |
| 43 #include "runtime/frame.inline.hpp" | |
| 44 #include "runtime/interfaceSupport.hpp" | |
| 45 #include "runtime/java.hpp" | |
| 46 #include "runtime/javaCalls.hpp" | |
| 47 #include "runtime/mutexLocker.hpp" | |
| 48 #include "runtime/osThread.hpp" | |
| 49 #include "runtime/sharedRuntime.hpp" | |
| 50 #include "runtime/stubRoutines.hpp" | |
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51 #include "runtime/thread.inline.hpp" |
| 1972 | 52 #include "runtime/timer.hpp" |
| 53 #include "utilities/events.hpp" | |
| 54 #include "utilities/vmError.hpp" | |
| 133 | 55 |
| 56 // Linux/Sparc has rather obscure naming of registers in sigcontext | |
| 57 // different between 32 and 64 bits | |
| 58 #ifdef _LP64 | |
| 59 #define SIG_PC(x) ((x)->sigc_regs.tpc) | |
| 60 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) | |
| 61 #define SIG_REGS(x) ((x)->sigc_regs) | |
| 62 #else | |
| 63 #define SIG_PC(x) ((x)->si_regs.pc) | |
| 64 #define SIG_NPC(x) ((x)->si_regs.npc) | |
| 65 #define SIG_REGS(x) ((x)->si_regs) | |
| 66 #endif | |
| 67 | |
| 68 // those are to reference registers in sigcontext | |
| 69 enum { | |
| 70 CON_G0 = 0, | |
| 71 CON_G1, | |
| 72 CON_G2, | |
| 73 CON_G3, | |
| 74 CON_G4, | |
| 75 CON_G5, | |
| 76 CON_G6, | |
| 77 CON_G7, | |
| 78 CON_O0, | |
| 79 CON_O1, | |
| 80 CON_O2, | |
| 81 CON_O3, | |
| 82 CON_O4, | |
| 83 CON_O5, | |
| 84 CON_O6, | |
| 85 CON_O7, | |
| 86 }; | |
| 87 | |
| 88 static inline void set_cont_address(sigcontext* ctx, address addr) { | |
| 89 SIG_PC(ctx) = (intptr_t)addr; | |
| 90 SIG_NPC(ctx) = (intptr_t)(addr+4); | |
| 91 } | |
| 92 | |
| 93 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
| 94 // currently interrupted by SIGPROF. | |
| 95 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested | |
| 96 // signal frames. Currently we don't do that on Linux, so it's the | |
| 97 // same as os::fetch_frame_from_context(). | |
| 98 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, | |
| 99 ucontext_t* uc, | |
| 100 intptr_t** ret_sp, | |
| 101 intptr_t** ret_fp) { | |
| 102 assert(thread != NULL, "just checking"); | |
| 103 assert(ret_sp != NULL, "just checking"); | |
| 104 assert(ret_fp != NULL, "just checking"); | |
| 105 | |
| 106 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
| 107 } | |
| 108 | |
| 109 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
| 110 intptr_t** ret_sp, | |
| 111 intptr_t** ret_fp) { | |
| 112 ucontext_t* uc = (ucontext_t*) ucVoid; | |
| 113 ExtendedPC epc; | |
| 114 | |
| 115 if (uc != NULL) { | |
| 116 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); | |
| 117 if (ret_sp) { | |
| 118 *ret_sp = os::Linux::ucontext_get_sp(uc); | |
| 119 } | |
| 120 if (ret_fp) { | |
| 121 *ret_fp = os::Linux::ucontext_get_fp(uc); | |
| 122 } | |
| 123 } else { | |
| 124 // construct empty ExtendedPC for return value checking | |
| 125 epc = ExtendedPC(NULL); | |
| 126 if (ret_sp) { | |
| 127 *ret_sp = (intptr_t*) NULL; | |
| 128 } | |
| 129 if (ret_fp) { | |
| 130 *ret_fp = (intptr_t*) NULL; | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 return epc; | |
| 135 } | |
| 136 | |
| 137 frame os::fetch_frame_from_context(void* ucVoid) { | |
| 138 intptr_t* sp; | |
| 139 intptr_t* fp; | |
| 140 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
| 141 return frame(sp, fp, epc.pc()); | |
| 142 } | |
| 143 | |
| 144 frame os::get_sender_for_C_frame(frame* fr) { | |
| 145 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
| 146 } | |
| 147 | |
| 148 frame os::current_frame() { | |
| 149 fprintf(stderr, "current_frame()"); | |
| 150 | |
| 151 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
| 152 frame myframe(sp, frame::unpatchable, | |
| 153 CAST_FROM_FN_PTR(address, os::current_frame)); | |
| 154 if (os::is_first_C_frame(&myframe)) { | |
| 155 // stack is not walkable | |
| 156 return frame(NULL, frame::unpatchable, NULL); | |
| 157 } else { | |
| 158 return os::get_sender_for_C_frame(&myframe); | |
| 159 } | |
| 160 } | |
| 161 | |
| 162 address os::current_stack_pointer() { | |
| 163 register void *sp __asm__ ("sp"); | |
| 164 return (address)sp; | |
| 165 } | |
| 166 | |
| 167 static void current_stack_region(address* bottom, size_t* size) { | |
| 168 if (os::Linux::is_initial_thread()) { | |
| 169 // initial thread needs special handling because pthread_getattr_np() | |
| 170 // may return bogus value. | |
| 171 *bottom = os::Linux::initial_thread_stack_bottom(); | |
| 172 *size = os::Linux::initial_thread_stack_size(); | |
| 173 } else { | |
| 174 pthread_attr_t attr; | |
| 175 | |
| 176 int rslt = pthread_getattr_np(pthread_self(), &attr); | |
| 177 | |
| 178 // JVM needs to know exact stack location, abort if it fails | |
| 179 if (rslt != 0) { | |
| 180 if (rslt == ENOMEM) { | |
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181 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); |
| 133 | 182 } else { |
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183 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
| 133 | 184 } |
| 185 } | |
| 186 | |
| 187 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { | |
| 188 fatal("Can not locate current stack attributes!"); | |
| 189 } | |
| 190 | |
| 191 pthread_attr_destroy(&attr); | |
| 192 } | |
| 193 assert(os::current_stack_pointer() >= *bottom && | |
| 194 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
| 195 } | |
| 196 | |
| 197 address os::current_stack_base() { | |
| 198 address bottom; | |
| 199 size_t size; | |
| 200 current_stack_region(&bottom, &size); | |
| 201 return bottom + size; | |
| 202 } | |
| 203 | |
| 204 size_t os::current_stack_size() { | |
| 205 // stack size includes normal stack and HotSpot guard pages | |
| 206 address bottom; | |
| 207 size_t size; | |
| 208 current_stack_region(&bottom, &size); | |
| 209 return size; | |
| 210 } | |
| 211 | |
| 212 char* os::non_memory_address_word() { | |
| 213 // Must never look like an address returned by reserve_memory, | |
| 214 // even in its subfields (as defined by the CPU immediate fields, | |
| 215 // if the CPU splits constants across multiple instructions). | |
| 216 // On SPARC, 0 != %hi(any real address), because there is no | |
| 217 // allocation in the first 1Kb of the virtual address space. | |
| 218 return (char*) 0; | |
| 219 } | |
| 220 | |
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221 void os::initialize_thread(Thread* thr) {} |
| 133 | 222 |
| 223 void os::print_context(outputStream *st, void *context) { | |
| 224 if (context == NULL) return; | |
| 225 | |
| 226 ucontext_t* uc = (ucontext_t*)context; | |
| 227 sigcontext* sc = (sigcontext*)context; | |
| 228 st->print_cr("Registers:"); | |
| 229 | |
| 1907 | 230 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT |
| 231 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, | |
| 232 SIG_REGS(sc).u_regs[CON_G1], | |
| 233 SIG_REGS(sc).u_regs[CON_G2], | |
| 234 SIG_REGS(sc).u_regs[CON_G3], | |
| 235 SIG_REGS(sc).u_regs[CON_G4]); | |
| 236 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT | |
| 237 " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, | |
| 238 SIG_REGS(sc).u_regs[CON_G5], | |
| 239 SIG_REGS(sc).u_regs[CON_G6], | |
| 240 SIG_REGS(sc).u_regs[CON_G7], | |
| 241 SIG_REGS(sc).y); | |
| 133 | 242 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT |
| 243 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, | |
| 244 SIG_REGS(sc).u_regs[CON_O0], | |
| 245 SIG_REGS(sc).u_regs[CON_O1], | |
| 246 SIG_REGS(sc).u_regs[CON_O2], | |
| 247 SIG_REGS(sc).u_regs[CON_O3]); | |
| 248 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT | |
| 249 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, | |
| 250 SIG_REGS(sc).u_regs[CON_O4], | |
| 251 SIG_REGS(sc).u_regs[CON_O5], | |
| 252 SIG_REGS(sc).u_regs[CON_O6], | |
| 253 SIG_REGS(sc).u_regs[CON_O7]); | |
| 254 | |
| 1907 | 255 |
| 256 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
| 257 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT | |
| 258 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, | |
| 259 sp[L0->sp_offset_in_saved_window()], | |
| 260 sp[L1->sp_offset_in_saved_window()], | |
| 261 sp[L2->sp_offset_in_saved_window()], | |
| 262 sp[L3->sp_offset_in_saved_window()]); | |
| 263 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT | |
| 264 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, | |
| 265 sp[L4->sp_offset_in_saved_window()], | |
| 266 sp[L5->sp_offset_in_saved_window()], | |
| 267 sp[L6->sp_offset_in_saved_window()], | |
| 268 sp[L7->sp_offset_in_saved_window()]); | |
| 269 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT | |
| 270 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, | |
| 271 sp[I0->sp_offset_in_saved_window()], | |
| 272 sp[I1->sp_offset_in_saved_window()], | |
| 273 sp[I2->sp_offset_in_saved_window()], | |
| 274 sp[I3->sp_offset_in_saved_window()]); | |
| 275 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT | |
| 276 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, | |
| 277 sp[I4->sp_offset_in_saved_window()], | |
| 278 sp[I5->sp_offset_in_saved_window()], | |
| 279 sp[I6->sp_offset_in_saved_window()], | |
| 280 sp[I7->sp_offset_in_saved_window()]); | |
| 133 | 281 |
| 282 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, | |
| 283 SIG_PC(sc), | |
| 284 SIG_NPC(sc)); | |
| 285 st->cr(); | |
| 286 st->cr(); | |
| 287 | |
| 288 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
| 289 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); | |
| 290 st->cr(); | |
| 291 | |
| 292 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
| 293 // point to garbage if entry point in an nmethod is corrupted. Leave | |
| 294 // this at the end, and hope for the best. | |
| 295 address pc = os::Linux::ucontext_get_pc(uc); | |
| 296 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
| 1907 | 297 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
| 298 } | |
| 299 | |
| 300 | |
| 301 void os::print_register_info(outputStream *st, void *context) { | |
| 302 if (context == NULL) return; | |
| 303 | |
| 304 ucontext_t *uc = (ucontext_t*)context; | |
| 17940 | 305 sigcontext* sc = (sigcontext*)context; |
| 1907 | 306 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); |
| 307 | |
| 308 st->print_cr("Register to memory mapping:"); | |
| 309 st->cr(); | |
| 310 | |
| 311 // this is only for the "general purpose" registers | |
| 17940 | 312 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); |
| 313 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); | |
| 314 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); | |
| 315 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); | |
| 316 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); | |
| 317 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); | |
| 318 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); | |
| 1907 | 319 st->cr(); |
| 320 | |
| 17940 | 321 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); |
| 322 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); | |
| 323 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); | |
| 324 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); | |
| 325 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); | |
| 326 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); | |
| 327 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); | |
| 328 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); | |
| 1907 | 329 st->cr(); |
| 330 | |
| 331 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); | |
| 332 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); | |
| 333 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); | |
| 334 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); | |
| 335 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); | |
| 336 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); | |
| 337 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); | |
| 338 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); | |
| 339 st->cr(); | |
| 340 | |
| 341 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); | |
| 342 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); | |
| 343 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); | |
| 344 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); | |
| 345 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); | |
| 346 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); | |
| 347 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); | |
| 348 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); | |
| 349 st->cr(); | |
| 133 | 350 } |
| 351 | |
| 352 | |
| 353 address os::Linux::ucontext_get_pc(ucontext_t* uc) { | |
| 354 return (address) SIG_PC((sigcontext*)uc); | |
| 355 } | |
| 356 | |
| 357 intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { | |
| 358 return (intptr_t*) | |
| 359 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); | |
| 360 } | |
| 361 | |
| 362 // not used on Sparc | |
| 363 intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { | |
| 364 ShouldNotReachHere(); | |
| 365 return NULL; | |
| 366 } | |
| 367 | |
| 368 // Utility functions | |
| 369 | |
| 370 inline static bool checkPrefetch(sigcontext* uc, address pc) { | |
| 11127 | 371 if (StubRoutines::is_safefetch_fault(pc)) { |
| 372 set_cont_address(uc, address(StubRoutines::continuation_for_safefetch_fault(pc))); | |
| 133 | 373 return true; |
| 374 } | |
| 375 return false; | |
| 376 } | |
| 377 | |
| 378 inline static bool checkOverflow(sigcontext* uc, | |
| 379 address pc, | |
| 380 address addr, | |
| 381 JavaThread* thread, | |
| 382 address* stub) { | |
| 383 // check if fault address is within thread stack | |
| 384 if (addr < thread->stack_base() && | |
| 385 addr >= thread->stack_base() - thread->stack_size()) { | |
| 386 // stack overflow | |
| 387 if (thread->in_stack_yellow_zone(addr)) { | |
| 388 thread->disable_stack_yellow_zone(); | |
| 389 if (thread->thread_state() == _thread_in_Java) { | |
| 390 // Throw a stack overflow exception. Guard pages will be reenabled | |
| 391 // while unwinding the stack. | |
| 392 *stub = | |
| 393 SharedRuntime::continuation_for_implicit_exception(thread, | |
| 394 pc, | |
| 395 SharedRuntime::STACK_OVERFLOW); | |
| 396 } else { | |
| 397 // Thread was in the vm or native code. Return and try to finish. | |
| 398 return true; | |
| 399 } | |
| 400 } else if (thread->in_stack_red_zone(addr)) { | |
| 401 // Fatal red zone violation. Disable the guard pages and fall through | |
| 402 // to handle_unexpected_exception way down below. | |
| 403 thread->disable_stack_red_zone(); | |
| 404 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
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405 |
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406 // This is a likely cause, but hard to verify. Let's just print |
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407 // it as a hint. |
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408 tty->print_raw_cr("Please check if any of your loaded .so files has " |
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409 "enabled executable stack (see man page execstack(8))"); |
| 133 | 410 } else { |
| 411 // Accessing stack address below sp may cause SEGV if current | |
| 412 // thread has MAP_GROWSDOWN stack. This should only happen when | |
| 413 // current thread was created by user code with MAP_GROWSDOWN flag | |
| 414 // and then attached to VM. See notes in os_linux.cpp. | |
| 415 if (thread->osthread()->expanding_stack() == 0) { | |
| 416 thread->osthread()->set_expanding_stack(); | |
| 417 if (os::Linux::manually_expand_stack(thread, addr)) { | |
| 418 thread->osthread()->clear_expanding_stack(); | |
| 419 return true; | |
| 420 } | |
| 421 thread->osthread()->clear_expanding_stack(); | |
| 422 } else { | |
| 423 fatal("recursive segv. expanding stack."); | |
| 424 } | |
| 425 } | |
| 426 } | |
| 427 return false; | |
| 428 } | |
| 429 | |
| 430 inline static bool checkPollingPage(address pc, address fault, address* stub) { | |
| 431 if (fault == os::get_polling_page()) { | |
| 432 *stub = SharedRuntime::get_poll_stub(pc); | |
| 433 return true; | |
| 434 } | |
| 435 return false; | |
| 436 } | |
| 437 | |
| 438 inline static bool checkByteBuffer(address pc, address* stub) { | |
| 439 // BugId 4454115: A read from a MappedByteBuffer can fault | |
| 440 // here if the underlying file has been truncated. | |
| 441 // Do not crash the VM in such a case. | |
| 442 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
| 443 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
| 444 if (nm != NULL && nm->has_unsafe_access()) { | |
| 445 *stub = StubRoutines::handler_for_unsafe_access(); | |
| 446 return true; | |
| 447 } | |
| 448 return false; | |
| 449 } | |
| 450 | |
| 451 inline static bool checkVerifyOops(address pc, address fault, address* stub) { | |
| 452 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] | |
| 453 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { | |
| 454 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; | |
| 455 warning("fixed up memory fault in +VerifyOops at address " | |
| 456 INTPTR_FORMAT, fault); | |
| 457 return true; | |
| 458 } | |
| 459 return false; | |
| 460 } | |
| 461 | |
| 462 inline static bool checkFPFault(address pc, int code, | |
| 463 JavaThread* thread, address* stub) { | |
| 464 if (code == FPE_INTDIV || code == FPE_FLTDIV) { | |
| 465 *stub = | |
| 466 SharedRuntime:: | |
| 467 continuation_for_implicit_exception(thread, | |
| 468 pc, | |
| 469 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
| 470 return true; | |
| 471 } | |
| 472 return false; | |
| 473 } | |
| 474 | |
| 475 inline static bool checkNullPointer(address pc, intptr_t fault, | |
| 476 JavaThread* thread, address* stub) { | |
| 477 if (!MacroAssembler::needs_explicit_null_check(fault)) { | |
| 478 // Determination of interpreter/vtable stub/compiled code null | |
| 479 // exception | |
| 480 *stub = | |
| 481 SharedRuntime:: | |
| 482 continuation_for_implicit_exception(thread, pc, | |
| 483 SharedRuntime::IMPLICIT_NULL); | |
| 484 return true; | |
| 485 } | |
| 486 return false; | |
| 487 } | |
| 488 | |
| 489 inline static bool checkFastJNIAccess(address pc, address* stub) { | |
| 490 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
| 491 if (addr != (address)-1) { | |
| 492 *stub = addr; | |
| 493 return true; | |
| 494 } | |
| 495 return false; | |
| 496 } | |
| 497 | |
| 498 inline static bool checkSerializePage(JavaThread* thread, address addr) { | |
| 499 return os::is_memory_serialize_page(thread, addr); | |
| 500 } | |
| 501 | |
| 502 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { | |
| 503 if (nativeInstruction_at(*pc)->is_zombie()) { | |
| 504 // zombie method (ld [%g0],%o7 instruction) | |
| 505 *stub = SharedRuntime::get_handle_wrong_method_stub(); | |
| 506 | |
| 507 // At the stub it needs to look like a call from the caller of this | |
| 508 // method (not a call from the segv site). | |
| 509 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
| 510 return true; | |
| 511 } | |
| 512 return false; | |
| 513 } | |
| 514 | |
| 515 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { | |
| 516 #ifdef COMPILER2 | |
| 517 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { | |
| 518 #ifdef ASSERT | |
| 519 #ifdef TIERED | |
| 17940 | 520 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); |
| 133 | 521 assert(cb->is_compiled_by_c2(), "Wrong compiler"); |
| 522 #endif // TIERED | |
| 523 #endif // ASSERT | |
| 524 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. | |
| 525 *stub = SharedRuntime::get_ic_miss_stub(); | |
| 526 // At the stub it needs to look like a call from the caller of this | |
| 527 // method (not a call from the segv site). | |
| 528 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
| 529 return true; | |
| 530 } | |
| 531 #endif // COMPILER2 | |
| 532 return false; | |
| 533 } | |
| 534 | |
| 2191 | 535 extern "C" JNIEXPORT int |
| 133 | 536 JVM_handle_linux_signal(int sig, |
| 537 siginfo_t* info, | |
| 538 void* ucVoid, | |
| 539 int abort_if_unrecognized) { | |
| 540 // in fact this isn't ucontext_t* at all, but struct sigcontext* | |
| 541 // but Linux porting layer uses ucontext_t, so to minimize code change | |
| 542 // we cast as needed | |
| 543 ucontext_t* ucFake = (ucontext_t*) ucVoid; | |
| 544 sigcontext* uc = (sigcontext*)ucVoid; | |
| 545 | |
| 546 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 547 | |
| 11151 | 548 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away |
| 549 // (no destructors can be run) | |
| 550 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); | |
| 551 | |
| 133 | 552 SignalHandlerMark shm(t); |
| 553 | |
| 554 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
| 555 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
| 556 // or have a SIGILL handler when detecting CPU type). When that happens, | |
| 557 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To | |
| 558 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
| 559 // that do not require siginfo/ucontext first. | |
| 560 | |
| 561 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
| 562 // allow chained handler to go first | |
| 563 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
| 564 return true; | |
| 565 } else { | |
| 566 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
| 567 char buf[64]; | |
| 568 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
| 569 os::exception_name(sig, buf, sizeof(buf))); | |
| 570 } | |
| 571 return true; | |
| 572 } | |
| 573 } | |
| 574 | |
| 575 JavaThread* thread = NULL; | |
| 576 VMThread* vmthread = NULL; | |
| 577 if (os::Linux::signal_handlers_are_installed) { | |
| 578 if (t != NULL ){ | |
| 579 if(t->is_Java_thread()) { | |
| 580 thread = (JavaThread*)t; | |
| 581 } | |
| 582 else if(t->is_VM_thread()){ | |
| 583 vmthread = (VMThread *)t; | |
| 584 } | |
| 585 } | |
| 586 } | |
| 587 | |
| 588 // decide if this trap can be handled by a stub | |
| 589 address stub = NULL; | |
| 590 address pc = NULL; | |
| 591 address npc = NULL; | |
| 592 | |
| 593 //%note os_trap_1 | |
| 594 if (info != NULL && uc != NULL && thread != NULL) { | |
| 595 pc = address(SIG_PC(uc)); | |
| 596 npc = address(SIG_NPC(uc)); | |
| 597 | |
| 598 // Check to see if we caught the safepoint code in the | |
| 599 // process of write protecting the memory serialization page. | |
| 600 // It write enables the page immediately after protecting it | |
| 601 // so we can just return to retry the write. | |
| 602 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { | |
| 603 // Block current thread until the memory serialize page permission restored. | |
| 604 os::block_on_serialize_page_trap(); | |
| 605 return 1; | |
| 606 } | |
| 607 | |
| 608 if (checkPrefetch(uc, pc)) { | |
| 609 return 1; | |
| 610 } | |
| 611 | |
| 612 // Handle ALL stack overflow variations here | |
| 613 if (sig == SIGSEGV) { | |
| 614 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { | |
| 615 return 1; | |
| 616 } | |
| 617 } | |
| 618 | |
| 619 if (sig == SIGBUS && | |
| 620 thread->thread_state() == _thread_in_vm && | |
| 621 thread->doing_unsafe_access()) { | |
| 622 stub = StubRoutines::handler_for_unsafe_access(); | |
| 623 } | |
| 624 | |
| 625 if (thread->thread_state() == _thread_in_Java) { | |
| 626 do { | |
| 627 // Java thread running in Java code => find exception handler if any | |
| 628 // a fault inside compiled code, the interpreter, or a stub | |
| 629 | |
| 630 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { | |
| 631 break; | |
| 632 } | |
| 633 | |
| 634 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { | |
| 635 break; | |
| 636 } | |
| 637 | |
| 638 if ((sig == SIGSEGV || sig == SIGBUS) && | |
| 639 checkVerifyOops(pc, (address)info->si_addr, &stub)) { | |
| 640 break; | |
| 641 } | |
| 642 | |
| 643 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { | |
| 644 break; | |
| 645 } | |
| 646 | |
| 647 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { | |
| 648 break; | |
| 649 } | |
| 650 | |
| 651 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { | |
| 652 break; | |
| 653 } | |
| 654 | |
| 655 if ((sig == SIGSEGV) && | |
| 656 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { | |
| 657 break; | |
| 658 } | |
| 659 } while (0); | |
| 660 | |
| 661 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
| 662 // and the heap gets shrunk before the field access. | |
| 663 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
| 664 checkFastJNIAccess(pc, &stub); | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 if (stub != NULL) { | |
| 669 // save all thread context in case we need to restore it | |
| 670 thread->set_saved_exception_pc(pc); | |
| 671 thread->set_saved_exception_npc(npc); | |
| 672 set_cont_address(uc, stub); | |
| 673 return true; | |
| 674 } | |
| 675 } | |
| 676 | |
| 677 // signal-chaining | |
| 678 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
| 679 return true; | |
| 680 } | |
| 681 | |
| 682 if (!abort_if_unrecognized) { | |
| 683 // caller wants another chance, so give it to him | |
| 684 return false; | |
| 685 } | |
| 686 | |
| 687 if (pc == NULL && uc != NULL) { | |
| 688 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); | |
| 689 } | |
| 690 | |
| 691 // unmask current signal | |
| 692 sigset_t newset; | |
| 693 sigemptyset(&newset); | |
| 694 sigaddset(&newset, sig); | |
| 695 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
| 696 | |
| 697 VMError err(t, sig, pc, info, ucVoid); | |
| 698 err.report_and_die(); | |
| 699 | |
| 700 ShouldNotReachHere(); | |
| 701 } | |
| 702 | |
| 703 void os::Linux::init_thread_fpu_state(void) { | |
| 704 // Nothing to do | |
| 705 } | |
| 706 | |
| 707 int os::Linux::get_fpu_control_word() { | |
| 708 return 0; | |
| 709 } | |
| 710 | |
| 711 void os::Linux::set_fpu_control_word(int fpu) { | |
| 712 // nothing | |
| 713 } | |
| 714 | |
| 715 bool os::is_allocatable(size_t bytes) { | |
| 716 #ifdef _LP64 | |
| 717 return true; | |
| 718 #else | |
| 719 if (bytes < 2 * G) { | |
| 720 return true; | |
| 721 } | |
| 722 | |
| 723 char* addr = reserve_memory(bytes, NULL); | |
| 724 | |
| 725 if (addr != NULL) { | |
| 726 release_memory(addr, bytes); | |
| 727 } | |
| 728 | |
| 729 return addr != NULL; | |
| 730 #endif // _LP64 | |
| 731 } | |
| 732 | |
| 733 /////////////////////////////////////////////////////////////////////////////// | |
| 734 // thread stack | |
| 735 | |
| 736 size_t os::Linux::min_stack_allowed = 128 * K; | |
| 737 | |
| 738 // pthread on Ubuntu is always in floating stack mode | |
| 739 bool os::Linux::supports_variable_stack_size() { return true; } | |
| 740 | |
| 741 // return default stack size for thr_type | |
| 742 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
| 743 // default stack size (compiler thread needs larger stack) | |
| 744 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
| 745 return s; | |
| 746 } | |
| 747 | |
| 748 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
| 749 // Creating guard page is very expensive. Java thread has HotSpot | |
| 750 // guard page, only enable glibc guard page for non-Java threads. | |
| 751 return (thr_type == java_thread ? 0 : page_size()); | |
| 752 } | |
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753 |
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754 #ifndef PRODUCT |
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755 void os::verify_stack_alignment() { |
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756 } |
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757 #endif |