1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2016 SAP SE. All rights reserved. 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 26 // no precompiled headers 27 #include "asm/assembler.inline.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "code/codeCache.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "jvm_aix.h" 36 #include "memory/allocation.inline.hpp" 37 #include "nativeInst_ppc.hpp" 38 #include "os_share_aix.hpp" 39 #include "prims/jniFastGetField.hpp" 40 #include "prims/jvm.h" 41 #include "prims/jvm_misc.hpp" 42 #include "porting_aix.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/extendedPC.hpp" 45 #include "runtime/frame.inline.hpp" 46 #include "runtime/interfaceSupport.hpp" 47 #include "runtime/java.hpp" 48 #include "runtime/javaCalls.hpp" 49 #include "runtime/mutexLocker.hpp" 50 #include "runtime/osThread.hpp" 51 #include "runtime/sharedRuntime.hpp" 52 #include "runtime/stubRoutines.hpp" 53 #include "runtime/thread.inline.hpp" 54 #include "runtime/timer.hpp" 55 #include "utilities/events.hpp" 56 #include "utilities/vmError.hpp" 57 #ifdef COMPILER1 58 #include "c1/c1_Runtime1.hpp" 59 #endif 60 #ifdef COMPILER2 61 #include "opto/runtime.hpp" 62 #endif 63 64 // put OS-includes here 65 # include <ucontext.h> 66 67 address os::current_stack_pointer() { 68 address csp; 69 70 #if !defined(USE_XLC_BUILTINS) 71 // inline assembly for `mr regno(csp), R1_SP': 72 __asm__ __volatile__ ("mr %0, 1":"=r"(csp):); 73 #else 74 csp = (address) __builtin_frame_address(0); 75 #endif 76 77 return csp; 78 } 79 80 char* os::non_memory_address_word() { 81 // Must never look like an address returned by reserve_memory, 82 // even in its subfields (as defined by the CPU immediate fields, 83 // if the CPU splits constants across multiple instructions). 84 85 return (char*) -1; 86 } 87 88 // OS specific thread initialization 89 // 90 // Calculate and store the limits of the memory stack. 91 void os::initialize_thread(Thread *thread) { } 92 93 // Frame information (pc, sp, fp) retrieved via ucontext 94 // always looks like a C-frame according to the frame 95 // conventions in frame_ppc.hpp. 96 97 address os::Aix::ucontext_get_pc(const ucontext_t * uc) { 98 return (address)uc->uc_mcontext.jmp_context.iar; 99 } 100 101 intptr_t* os::Aix::ucontext_get_sp(const ucontext_t * uc) { 102 // gpr1 holds the stack pointer on aix 103 return (intptr_t*)uc->uc_mcontext.jmp_context.gpr[1/*REG_SP*/]; 104 } 105 106 intptr_t* os::Aix::ucontext_get_fp(const ucontext_t * uc) { 107 return NULL; 108 } 109 110 void os::Aix::ucontext_set_pc(ucontext_t* uc, address new_pc) { 111 uc->uc_mcontext.jmp_context.iar = (uint64_t) new_pc; 112 } 113 114 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 115 intptr_t** ret_sp, intptr_t** ret_fp) { 116 117 ExtendedPC epc; 118 const ucontext_t* uc = (const ucontext_t*)ucVoid; 119 120 if (uc != NULL) { 121 epc = ExtendedPC(os::Aix::ucontext_get_pc(uc)); 122 if (ret_sp) *ret_sp = os::Aix::ucontext_get_sp(uc); 123 if (ret_fp) *ret_fp = os::Aix::ucontext_get_fp(uc); 124 } else { 125 // construct empty ExtendedPC for return value checking 126 epc = ExtendedPC(NULL); 127 if (ret_sp) *ret_sp = (intptr_t *)NULL; 128 if (ret_fp) *ret_fp = (intptr_t *)NULL; 129 } 130 131 return epc; 132 } 133 134 frame os::fetch_frame_from_context(const void* ucVoid) { 135 intptr_t* sp; 136 intptr_t* fp; 137 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 138 // Avoid crash during crash if pc broken. 139 if (epc.pc()) { 140 frame fr(sp, epc.pc()); 141 return fr; 142 } 143 frame fr(sp); 144 return fr; 145 } 146 147 bool os::Aix::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 148 address pc = (address) os::Aix::ucontext_get_pc(uc); 149 if (Interpreter::contains(pc)) { 150 // Interpreter performs stack banging after the fixed frame header has 151 // been generated while the compilers perform it before. To maintain 152 // semantic consistency between interpreted and compiled frames, the 153 // method returns the Java sender of the current frame. 154 *fr = os::fetch_frame_from_context(uc); 155 if (!fr->is_first_java_frame()) { 156 assert(fr->safe_for_sender(thread), "Safety check"); 157 *fr = fr->java_sender(); 158 } 159 } else { 160 // More complex code with compiled code. 161 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 162 CodeBlob* cb = CodeCache::find_blob(pc); 163 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 164 // Not sure where the pc points to, fallback to default 165 // stack overflow handling. In compiled code, we bang before 166 // the frame is complete. 167 return false; 168 } else { 169 intptr_t* sp = os::Aix::ucontext_get_sp(uc); 170 *fr = frame(sp, (address)*sp); 171 if (!fr->is_java_frame()) { 172 assert(fr->safe_for_sender(thread), "Safety check"); 173 assert(!fr->is_first_frame(), "Safety check"); 174 *fr = fr->java_sender(); 175 } 176 } 177 } 178 assert(fr->is_java_frame(), "Safety check"); 179 return true; 180 } 181 182 frame os::get_sender_for_C_frame(frame* fr) { 183 if (*fr->sp() == NULL) { 184 // fr is the last C frame 185 return frame(NULL, NULL); 186 } 187 return frame(fr->sender_sp(), fr->sender_pc()); 188 } 189 190 191 frame os::current_frame() { 192 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer()); 193 // hack. 194 frame topframe(csp, (address)0x8); 195 // return sender of current topframe which hopefully has pc != NULL. 196 return os::get_sender_for_C_frame(&topframe); 197 } 198 199 // Utility functions 200 201 extern "C" JNIEXPORT int 202 JVM_handle_aix_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) { 203 204 ucontext_t* uc = (ucontext_t*) ucVoid; 205 206 Thread* t = Thread::current_or_null_safe(); 207 208 SignalHandlerMark shm(t); 209 210 // Note: it's not uncommon that JNI code uses signal/sigset to install 211 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 212 // or have a SIGILL handler when detecting CPU type). When that happens, 213 // JVM_handle_aix_signal() might be invoked with junk info/ucVoid. To 214 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 215 // that do not require siginfo/ucontext first. 216 217 if (sig == SIGPIPE) { 218 if (os::Aix::chained_handler(sig, info, ucVoid)) { 219 return 1; 220 } else { 221 // Ignoring SIGPIPE - see bugs 4229104 222 return 1; 223 } 224 } 225 226 JavaThread* thread = NULL; 227 VMThread* vmthread = NULL; 228 if (os::Aix::signal_handlers_are_installed) { 229 if (t != NULL) { 230 if(t->is_Java_thread()) { 231 thread = (JavaThread*)t; 232 } 233 else if(t->is_VM_thread()) { 234 vmthread = (VMThread *)t; 235 } 236 } 237 } 238 239 // Decide if this trap can be handled by a stub. 240 address stub = NULL; 241 242 // retrieve program counter 243 address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL; 244 245 // retrieve crash address 246 address const addr = info ? (const address) info->si_addr : NULL; 247 248 // SafeFetch 32 handling: 249 // - make it work if _thread is null 250 // - make it use the standard os::...::ucontext_get/set_pc APIs 251 if (uc) { 252 address const pc = os::Aix::ucontext_get_pc(uc); 253 if (pc && StubRoutines::is_safefetch_fault(pc)) { 254 os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 255 return true; 256 } 257 } 258 259 // Handle SIGDANGER right away. AIX would raise SIGDANGER whenever available swap 260 // space falls below 30%. This is only a chance for the process to gracefully abort. 261 // We can't hope to proceed after SIGDANGER since SIGKILL tailgates. 262 if (sig == SIGDANGER) { 263 goto report_and_die; 264 } 265 266 if (info == NULL || uc == NULL || thread == NULL && vmthread == NULL) { 267 goto run_chained_handler; 268 } 269 270 // If we are a java thread... 271 if (thread != NULL) { 272 273 // Handle ALL stack overflow variations here 274 if (sig == SIGSEGV && thread->on_local_stack(addr)) { 275 // stack overflow 276 // 277 // If we are in a yellow zone and we are inside java, we disable the yellow zone and 278 // throw a stack overflow exception. 279 // If we are in native code or VM C code, we report-and-die. The original coding tried 280 // to continue with yellow zone disabled, but that doesn't buy us much and prevents 281 // hs_err_pid files. 282 if (thread->in_stack_yellow_reserved_zone(addr)) { 283 if (thread->thread_state() == _thread_in_Java) { 284 if (thread->in_stack_reserved_zone(addr)) { 285 frame fr; 286 if (os::Aix::get_frame_at_stack_banging_point(thread, uc, &fr)) { 287 assert(fr.is_java_frame(), "Must be a Javac frame"); 288 frame activation = 289 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 290 if (activation.sp() != NULL) { 291 thread->disable_stack_reserved_zone(); 292 if (activation.is_interpreted_frame()) { 293 thread->set_reserved_stack_activation((address)activation.fp()); 294 } else { 295 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 296 } 297 return 1; 298 } 299 } 300 } 301 // Throw a stack overflow exception. 302 // Guard pages will be reenabled while unwinding the stack. 303 thread->disable_stack_yellow_reserved_zone(); 304 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 305 goto run_stub; 306 } else { 307 // Thread was in the vm or native code. Return and try to finish. 308 thread->disable_stack_yellow_reserved_zone(); 309 return 1; 310 } 311 } else if (thread->in_stack_red_zone(addr)) { 312 // Fatal red zone violation. Disable the guard pages and fall through 313 // to handle_unexpected_exception way down below. 314 thread->disable_stack_red_zone(); 315 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 316 goto report_and_die; 317 } else { 318 // This means a segv happened inside our stack, but not in 319 // the guarded zone. I'd like to know when this happens, 320 tty->print_raw_cr("SIGSEGV happened inside stack but outside yellow and red zone."); 321 goto report_and_die; 322 } 323 324 } // end handle SIGSEGV inside stack boundaries 325 326 if (thread->thread_state() == _thread_in_Java) { 327 // Java thread running in Java code 328 329 // The following signals are used for communicating VM events: 330 // 331 // SIGILL: the compiler generates illegal opcodes 332 // at places where it wishes to interrupt the VM: 333 // Safepoints, Unreachable Code, Entry points of Zombie methods, 334 // This results in a SIGILL with (*pc) == inserted illegal instruction. 335 // 336 // (so, SIGILLs with a pc inside the zero page are real errors) 337 // 338 // SIGTRAP: 339 // The ppc trap instruction raises a SIGTRAP and is very efficient if it 340 // does not trap. It is used for conditional branches that are expected 341 // to be never taken. These are: 342 // - zombie methods 343 // - IC (inline cache) misses. 344 // - null checks leading to UncommonTraps. 345 // - range checks leading to Uncommon Traps. 346 // On Aix, these are especially null checks, as the ImplicitNullCheck 347 // optimization works only in rare cases, as the page at address 0 is only 348 // write protected. // 349 // Note: !UseSIGTRAP is used to prevent SIGTRAPS altogether, to facilitate debugging. 350 // 351 // SIGSEGV: 352 // used for safe point polling: 353 // To notify all threads that they have to reach a safe point, safe point polling is used: 354 // All threads poll a certain mapped memory page. Normally, this page has read access. 355 // If the VM wants to inform the threads about impending safe points, it puts this 356 // page to read only ("poisens" the page), and the threads then reach a safe point. 357 // used for null checks: 358 // If the compiler finds a store it uses it for a null check. Unfortunately this 359 // happens rarely. In heap based and disjoint base compressd oop modes also loads 360 // are used for null checks. 361 362 // A VM-related SIGILL may only occur if we are not in the zero page. 363 // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else 364 // in the zero page, because it is filled with 0x0. We ignore 365 // explicit SIGILLs in the zero page. 366 if (sig == SIGILL && (pc < (address) 0x200)) { 367 if (TraceTraps) { 368 tty->print_raw_cr("SIGILL happened inside zero page."); 369 } 370 goto report_and_die; 371 } 372 373 // Handle signal from NativeJump::patch_verified_entry(). 374 if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) || 375 (!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) { 376 if (TraceTraps) { 377 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); 378 } 379 stub = SharedRuntime::get_handle_wrong_method_stub(); 380 goto run_stub; 381 } 382 383 else if (sig == SIGSEGV && os::is_poll_address(addr)) { 384 if (TraceTraps) { 385 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", pc); 386 } 387 stub = SharedRuntime::get_poll_stub(pc); 388 goto run_stub; 389 } 390 391 // SIGTRAP-based ic miss check in compiled code. 392 else if (sig == SIGTRAP && TrapBasedICMissChecks && 393 nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) { 394 if (TraceTraps) { 395 tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 396 } 397 stub = SharedRuntime::get_ic_miss_stub(); 398 goto run_stub; 399 } 400 401 // SIGTRAP-based implicit null check in compiled code. 402 else if (sig == SIGTRAP && TrapBasedNullChecks && 403 nativeInstruction_at(pc)->is_sigtrap_null_check()) { 404 if (TraceTraps) { 405 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 406 } 407 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 408 goto run_stub; 409 } 410 411 // SIGSEGV-based implicit null check in compiled code. 412 else if (sig == SIGSEGV && ImplicitNullChecks && 413 CodeCache::contains((void*) pc) && 414 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) { 415 if (TraceTraps) { 416 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc); 417 } 418 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 419 } 420 421 #ifdef COMPILER2 422 // SIGTRAP-based implicit range check in compiled code. 423 else if (sig == SIGTRAP && TrapBasedRangeChecks && 424 nativeInstruction_at(pc)->is_sigtrap_range_check()) { 425 if (TraceTraps) { 426 tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 427 } 428 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 429 goto run_stub; 430 } 431 #endif 432 433 else if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { 434 if (TraceTraps) { 435 tty->print_raw_cr("Fix SIGFPE handler, trying divide by zero handler."); 436 } 437 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 438 goto run_stub; 439 } 440 441 else if (sig == SIGBUS) { 442 // BugId 4454115: A read from a MappedByteBuffer can fault here if the 443 // underlying file has been truncated. Do not crash the VM in such a case. 444 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 445 CompiledMethod* nm = cb->as_compiled_method_or_null(); 446 if (nm != NULL && nm->has_unsafe_access()) { 447 address next_pc = pc + 4; 448 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 449 os::Aix::ucontext_set_pc(uc, next_pc); 450 return 1; 451 } 452 } 453 } 454 455 else { // thread->thread_state() != _thread_in_Java 456 // Detect CPU features. This is only done at the very start of the VM. Later, the 457 // VM_Version::is_determine_features_test_running() flag should be false. 458 459 if (sig == SIGILL && VM_Version::is_determine_features_test_running()) { 460 // SIGILL must be caused by VM_Version::determine_features(). 461 *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL, 462 // flushing of icache is not necessary. 463 stub = pc + 4; // continue with next instruction. 464 goto run_stub; 465 } 466 else if (thread->thread_state() == _thread_in_vm && 467 sig == SIGBUS && thread->doing_unsafe_access()) { 468 address next_pc = pc + 4; 469 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 470 os::Aix::ucontext_set_pc(uc, next_pc); 471 return 1; 472 } 473 } 474 475 // Check to see if we caught the safepoint code in the 476 // process of write protecting the memory serialization page. 477 // It write enables the page immediately after protecting it 478 // so we can just return to retry the write. 479 if ((sig == SIGSEGV) && 480 os::is_memory_serialize_page(thread, addr)) { 481 // Synchronization problem in the pseudo memory barrier code (bug id 6546278) 482 // Block current thread until the memory serialize page permission restored. 483 os::block_on_serialize_page_trap(); 484 return true; 485 } 486 } 487 488 run_stub: 489 490 // One of the above code blocks ininitalized the stub, so we want to 491 // delegate control to that stub. 492 if (stub != NULL) { 493 // Save all thread context in case we need to restore it. 494 if (thread != NULL) thread->set_saved_exception_pc(pc); 495 os::Aix::ucontext_set_pc(uc, stub); 496 return 1; 497 } 498 499 run_chained_handler: 500 501 // signal-chaining 502 if (os::Aix::chained_handler(sig, info, ucVoid)) { 503 return 1; 504 } 505 if (!abort_if_unrecognized) { 506 // caller wants another chance, so give it to him 507 return 0; 508 } 509 510 report_and_die: 511 512 // Use sigthreadmask instead of sigprocmask on AIX and unmask current signal. 513 sigset_t newset; 514 sigemptyset(&newset); 515 sigaddset(&newset, sig); 516 sigthreadmask(SIG_UNBLOCK, &newset, NULL); 517 518 VMError::report_and_die(t, sig, pc, info, ucVoid); 519 520 ShouldNotReachHere(); 521 return 0; 522 } 523 524 void os::Aix::init_thread_fpu_state(void) { 525 #if !defined(USE_XLC_BUILTINS) 526 // Disable FP exceptions. 527 __asm__ __volatile__ ("mtfsfi 6,0"); 528 #else 529 __mtfsfi(6, 0); 530 #endif 531 } 532 533 //////////////////////////////////////////////////////////////////////////////// 534 // thread stack 535 536 size_t os::Aix::min_stack_allowed = 128*K; 537 538 // return default stack size for thr_type 539 size_t os::Aix::default_stack_size(os::ThreadType thr_type) { 540 // default stack size (compiler thread needs larger stack) 541 // Notice that the setting for compiler threads here have no impact 542 // because of the strange 'fallback logic' in os::create_thread(). 543 // Better set CompilerThreadStackSize in globals_<os_cpu>.hpp if you want to 544 // specify a different stack size for compiler threads! 545 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 546 return s; 547 } 548 549 size_t os::Aix::default_guard_size(os::ThreadType thr_type) { 550 return 2 * page_size(); 551 } 552 553 ///////////////////////////////////////////////////////////////////////////// 554 // helper functions for fatal error handler 555 556 void os::print_context(outputStream *st, const void *context) { 557 if (context == NULL) return; 558 559 const ucontext_t* uc = (const ucontext_t*)context; 560 561 st->print_cr("Registers:"); 562 st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.iar); 563 st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.lr); 564 st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.ctr); 565 st->cr(); 566 for (int i = 0; i < 32; i++) { 567 st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.jmp_context.gpr[i]); 568 if (i % 3 == 2) st->cr(); 569 } 570 st->cr(); 571 st->cr(); 572 573 intptr_t *sp = (intptr_t *)os::Aix::ucontext_get_sp(uc); 574 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 575 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t)); 576 st->cr(); 577 578 // Note: it may be unsafe to inspect memory near pc. For example, pc may 579 // point to garbage if entry point in an nmethod is corrupted. Leave 580 // this at the end, and hope for the best. 581 address pc = os::Aix::ucontext_get_pc(uc); 582 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 583 print_hex_dump(st, pc - 64, pc + 64, /*instrsize=*/4); 584 st->cr(); 585 586 // Try to decode the instructions. 587 st->print_cr("Decoded instructions: (pc=" PTR_FORMAT ")", pc); 588 st->print("<TODO: PPC port - print_context>"); 589 // TODO: PPC port Disassembler::decode(pc, 16, 16, st); 590 st->cr(); 591 } 592 593 void os::print_register_info(outputStream *st, const void *context) { 594 if (context == NULL) return; 595 596 ucontext_t *uc = (ucontext_t*)context; 597 598 st->print_cr("Register to memory mapping:"); 599 st->cr(); 600 601 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.iar); 602 st->print("lr ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.lr); 603 st->print("sp ="); print_location(st, (intptr_t)os::Aix::ucontext_get_sp(uc)); 604 for (int i = 0; i < 32; i++) { 605 st->print("r%-2d=", i); 606 print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.gpr[i]); 607 } 608 609 st->cr(); 610 } 611 612 extern "C" { 613 int SpinPause() { 614 return 0; 615 } 616 } 617 618 #ifndef PRODUCT 619 void os::verify_stack_alignment() { 620 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 621 } 622 #endif 623 624 int os::extra_bang_size_in_bytes() { 625 // PPC does not require the additional stack bang. 626 return 0; 627 } 628 629 bool os::platform_print_native_stack(outputStream* st, void* context, char *buf, int buf_size) { 630 AixNativeCallstack::print_callstack_for_context(st, (const ucontext_t*)context, true, buf, (size_t) buf_size); 631 return true; 632 } 633 634