1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2017 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 "jvm.h" 28 #include "asm/assembler.inline.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/vtableStubs.hpp" 35 #include "interpreter/interpreter.hpp" 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_misc.hpp" 41 #include "porting_aix.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/extendedPC.hpp" 44 #include "runtime/frame.inline.hpp" 45 #include "runtime/interfaceSupport.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/javaCalls.hpp" 48 #include "runtime/mutexLocker.hpp" 49 #include "runtime/osThread.hpp" 50 #include "runtime/sharedRuntime.hpp" 51 #include "runtime/stubRoutines.hpp" 52 #include "runtime/thread.inline.hpp" 53 #include "runtime/timer.hpp" 54 #include "utilities/events.hpp" 55 #include "utilities/vmError.hpp" 56 #ifdef COMPILER1 57 #include "c1/c1_Runtime1.hpp" 58 #endif 59 #ifdef COMPILER2 60 #include "opto/runtime.hpp" 61 #endif 62 63 // put OS-includes here 64 # include <ucontext.h> 65 66 address os::current_stack_pointer() { 67 address csp; 68 69 #if !defined(USE_XLC_BUILTINS) 70 // inline assembly for `mr regno(csp), R1_SP': 71 __asm__ __volatile__ ("mr %0, 1":"=r"(csp):); 72 #else 73 csp = (address) __builtin_frame_address(0); 74 #endif 75 76 return csp; 77 } 78 79 char* os::non_memory_address_word() { 80 // Must never look like an address returned by reserve_memory, 81 // even in its subfields (as defined by the CPU immediate fields, 82 // if the CPU splits constants across multiple instructions). 83 84 return (char*) -1; 85 } 86 87 // OS specific thread initialization 88 // 89 // Calculate and store the limits of the memory stack. 90 void os::initialize_thread(Thread *thread) { } 91 92 // Frame information (pc, sp, fp) retrieved via ucontext 93 // always looks like a C-frame according to the frame 94 // conventions in frame_ppc.hpp. 95 96 address os::Aix::ucontext_get_pc(const ucontext_t * uc) { 97 return (address)uc->uc_mcontext.jmp_context.iar; 98 } 99 100 intptr_t* os::Aix::ucontext_get_sp(const ucontext_t * uc) { 101 // gpr1 holds the stack pointer on aix 102 return (intptr_t*)uc->uc_mcontext.jmp_context.gpr[1/*REG_SP*/]; 103 } 104 105 intptr_t* os::Aix::ucontext_get_fp(const ucontext_t * uc) { 106 return NULL; 107 } 108 109 void os::Aix::ucontext_set_pc(ucontext_t* uc, address new_pc) { 110 uc->uc_mcontext.jmp_context.iar = (uint64_t) new_pc; 111 } 112 113 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 114 intptr_t** ret_sp, intptr_t** ret_fp) { 115 116 ExtendedPC epc; 117 const ucontext_t* uc = (const ucontext_t*)ucVoid; 118 119 if (uc != NULL) { 120 epc = ExtendedPC(os::Aix::ucontext_get_pc(uc)); 121 if (ret_sp) *ret_sp = os::Aix::ucontext_get_sp(uc); 122 if (ret_fp) *ret_fp = os::Aix::ucontext_get_fp(uc); 123 } else { 124 // construct empty ExtendedPC for return value checking 125 epc = ExtendedPC(NULL); 126 if (ret_sp) *ret_sp = (intptr_t *)NULL; 127 if (ret_fp) *ret_fp = (intptr_t *)NULL; 128 } 129 130 return epc; 131 } 132 133 frame os::fetch_frame_from_context(const void* ucVoid) { 134 intptr_t* sp; 135 intptr_t* fp; 136 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 137 // Avoid crash during crash if pc broken. 138 if (epc.pc()) { 139 frame fr(sp, epc.pc()); 140 return fr; 141 } 142 frame fr(sp); 143 return fr; 144 } 145 146 bool os::Aix::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 147 address pc = (address) os::Aix::ucontext_get_pc(uc); 148 if (Interpreter::contains(pc)) { 149 // Interpreter performs stack banging after the fixed frame header has 150 // been generated while the compilers perform it before. To maintain 151 // semantic consistency between interpreted and compiled frames, the 152 // method returns the Java sender of the current frame. 153 *fr = os::fetch_frame_from_context(uc); 154 if (!fr->is_first_java_frame()) { 155 assert(fr->safe_for_sender(thread), "Safety check"); 156 *fr = fr->java_sender(); 157 } 158 } else { 159 // More complex code with compiled code. 160 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 161 CodeBlob* cb = CodeCache::find_blob(pc); 162 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 163 // Not sure where the pc points to, fallback to default 164 // stack overflow handling. In compiled code, we bang before 165 // the frame is complete. 166 return false; 167 } else { 168 intptr_t* sp = os::Aix::ucontext_get_sp(uc); 169 *fr = frame(sp, (address)*sp); 170 if (!fr->is_java_frame()) { 171 assert(fr->safe_for_sender(thread), "Safety check"); 172 assert(!fr->is_first_frame(), "Safety check"); 173 *fr = fr->java_sender(); 174 } 175 } 176 } 177 assert(fr->is_java_frame(), "Safety check"); 178 return true; 179 } 180 181 frame os::get_sender_for_C_frame(frame* fr) { 182 if (*fr->sp() == NULL) { 183 // fr is the last C frame 184 return frame(NULL, NULL); 185 } 186 return frame(fr->sender_sp(), fr->sender_pc()); 187 } 188 189 190 frame os::current_frame() { 191 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer()); 192 // hack. 193 frame topframe(csp, (address)0x8); 194 // Return sender of sender of current topframe which hopefully 195 // both have pc != NULL. 196 frame tmp = os::get_sender_for_C_frame(&topframe); 197 return os::get_sender_for_C_frame(&tmp); 198 } 199 200 // Utility functions 201 202 extern "C" JNIEXPORT int 203 JVM_handle_aix_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) { 204 205 ucontext_t* uc = (ucontext_t*) ucVoid; 206 207 Thread* t = Thread::current_or_null_safe(); 208 209 SignalHandlerMark shm(t); 210 211 // Note: it's not uncommon that JNI code uses signal/sigset to install 212 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 213 // or have a SIGILL handler when detecting CPU type). When that happens, 214 // JVM_handle_aix_signal() might be invoked with junk info/ucVoid. To 215 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 216 // that do not require siginfo/ucontext first. 217 218 if (sig == SIGPIPE) { 219 if (os::Aix::chained_handler(sig, info, ucVoid)) { 220 return 1; 221 } else { 222 // Ignoring SIGPIPE - see bugs 4229104 223 return 1; 224 } 225 } 226 227 JavaThread* thread = NULL; 228 VMThread* vmthread = NULL; 229 if (os::Aix::signal_handlers_are_installed) { 230 if (t != NULL) { 231 if(t->is_Java_thread()) { 232 thread = (JavaThread*)t; 233 } 234 else if(t->is_VM_thread()) { 235 vmthread = (VMThread *)t; 236 } 237 } 238 } 239 240 // Decide if this trap can be handled by a stub. 241 address stub = NULL; 242 243 // retrieve program counter 244 address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL; 245 246 // retrieve crash address 247 address const addr = info ? (const address) info->si_addr : NULL; 248 249 // SafeFetch 32 handling: 250 // - make it work if _thread is null 251 // - make it use the standard os::...::ucontext_get/set_pc APIs 252 if (uc) { 253 address const pc = os::Aix::ucontext_get_pc(uc); 254 if (pc && StubRoutines::is_safefetch_fault(pc)) { 255 os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 256 return true; 257 } 258 } 259 260 if (info == NULL || uc == NULL || thread == NULL && vmthread == NULL) { 261 goto run_chained_handler; 262 } 263 264 // If we are a java thread... 265 if (thread != NULL) { 266 267 // Handle ALL stack overflow variations here 268 if (sig == SIGSEGV && thread->on_local_stack(addr)) { 269 // stack overflow 270 // 271 // If we are in a yellow zone and we are inside java, we disable the yellow zone and 272 // throw a stack overflow exception. 273 // If we are in native code or VM C code, we report-and-die. The original coding tried 274 // to continue with yellow zone disabled, but that doesn't buy us much and prevents 275 // hs_err_pid files. 276 if (thread->in_stack_yellow_reserved_zone(addr)) { 277 if (thread->thread_state() == _thread_in_Java) { 278 if (thread->in_stack_reserved_zone(addr)) { 279 frame fr; 280 if (os::Aix::get_frame_at_stack_banging_point(thread, uc, &fr)) { 281 assert(fr.is_java_frame(), "Must be a Javac frame"); 282 frame activation = 283 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 284 if (activation.sp() != NULL) { 285 thread->disable_stack_reserved_zone(); 286 if (activation.is_interpreted_frame()) { 287 thread->set_reserved_stack_activation((address)activation.fp()); 288 } else { 289 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 290 } 291 return 1; 292 } 293 } 294 } 295 // Throw a stack overflow exception. 296 // Guard pages will be reenabled while unwinding the stack. 297 thread->disable_stack_yellow_reserved_zone(); 298 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 299 goto run_stub; 300 } else { 301 // Thread was in the vm or native code. Return and try to finish. 302 thread->disable_stack_yellow_reserved_zone(); 303 return 1; 304 } 305 } else if (thread->in_stack_red_zone(addr)) { 306 // Fatal red zone violation. Disable the guard pages and fall through 307 // to handle_unexpected_exception way down below. 308 thread->disable_stack_red_zone(); 309 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 310 goto report_and_die; 311 } else { 312 // This means a segv happened inside our stack, but not in 313 // the guarded zone. I'd like to know when this happens, 314 tty->print_raw_cr("SIGSEGV happened inside stack but outside yellow and red zone."); 315 goto report_and_die; 316 } 317 318 } // end handle SIGSEGV inside stack boundaries 319 320 if (thread->thread_state() == _thread_in_Java) { 321 // Java thread running in Java code 322 323 // The following signals are used for communicating VM events: 324 // 325 // SIGILL: the compiler generates illegal opcodes 326 // at places where it wishes to interrupt the VM: 327 // Safepoints, Unreachable Code, Entry points of Zombie methods, 328 // This results in a SIGILL with (*pc) == inserted illegal instruction. 329 // 330 // (so, SIGILLs with a pc inside the zero page are real errors) 331 // 332 // SIGTRAP: 333 // The ppc trap instruction raises a SIGTRAP and is very efficient if it 334 // does not trap. It is used for conditional branches that are expected 335 // to be never taken. These are: 336 // - zombie methods 337 // - IC (inline cache) misses. 338 // - null checks leading to UncommonTraps. 339 // - range checks leading to Uncommon Traps. 340 // On Aix, these are especially null checks, as the ImplicitNullCheck 341 // optimization works only in rare cases, as the page at address 0 is only 342 // write protected. // 343 // Note: !UseSIGTRAP is used to prevent SIGTRAPS altogether, to facilitate debugging. 344 // 345 // SIGSEGV: 346 // used for safe point polling: 347 // To notify all threads that they have to reach a safe point, safe point polling is used: 348 // All threads poll a certain mapped memory page. Normally, this page has read access. 349 // If the VM wants to inform the threads about impending safe points, it puts this 350 // page to read only ("poisens" the page), and the threads then reach a safe point. 351 // used for null checks: 352 // If the compiler finds a store it uses it for a null check. Unfortunately this 353 // happens rarely. In heap based and disjoint base compressd oop modes also loads 354 // are used for null checks. 355 356 // A VM-related SIGILL may only occur if we are not in the zero page. 357 // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else 358 // in the zero page, because it is filled with 0x0. We ignore 359 // explicit SIGILLs in the zero page. 360 if (sig == SIGILL && (pc < (address) 0x200)) { 361 if (TraceTraps) { 362 tty->print_raw_cr("SIGILL happened inside zero page."); 363 } 364 goto report_and_die; 365 } 366 367 // Handle signal from NativeJump::patch_verified_entry(). 368 if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) || 369 (!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) { 370 if (TraceTraps) { 371 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); 372 } 373 stub = SharedRuntime::get_handle_wrong_method_stub(); 374 goto run_stub; 375 } 376 377 else if (sig == SIGSEGV && os::is_poll_address(addr)) { 378 if (TraceTraps) { 379 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", pc); 380 } 381 stub = SharedRuntime::get_poll_stub(pc); 382 goto run_stub; 383 } 384 385 // SIGTRAP-based ic miss check in compiled code. 386 else if (sig == SIGTRAP && TrapBasedICMissChecks && 387 nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) { 388 if (TraceTraps) { 389 tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 390 } 391 stub = SharedRuntime::get_ic_miss_stub(); 392 goto run_stub; 393 } 394 395 // SIGTRAP-based implicit null check in compiled code. 396 else if (sig == SIGTRAP && TrapBasedNullChecks && 397 nativeInstruction_at(pc)->is_sigtrap_null_check()) { 398 if (TraceTraps) { 399 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 400 } 401 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 402 goto run_stub; 403 } 404 405 // SIGSEGV-based implicit null check in compiled code. 406 else if (sig == SIGSEGV && ImplicitNullChecks && 407 CodeCache::contains((void*) pc) && 408 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) { 409 if (TraceTraps) { 410 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc); 411 } 412 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 413 } 414 415 #ifdef COMPILER2 416 // SIGTRAP-based implicit range check in compiled code. 417 else if (sig == SIGTRAP && TrapBasedRangeChecks && 418 nativeInstruction_at(pc)->is_sigtrap_range_check()) { 419 if (TraceTraps) { 420 tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 421 } 422 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 423 goto run_stub; 424 } 425 #endif 426 427 else if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { 428 if (TraceTraps) { 429 tty->print_raw_cr("Fix SIGFPE handler, trying divide by zero handler."); 430 } 431 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 432 goto run_stub; 433 } 434 435 else if (sig == SIGBUS) { 436 // BugId 4454115: A read from a MappedByteBuffer can fault here if the 437 // underlying file has been truncated. Do not crash the VM in such a case. 438 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 439 CompiledMethod* nm = cb->as_compiled_method_or_null(); 440 if (nm != NULL && nm->has_unsafe_access()) { 441 address next_pc = pc + 4; 442 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 443 os::Aix::ucontext_set_pc(uc, next_pc); 444 return 1; 445 } 446 } 447 } 448 449 else { // thread->thread_state() != _thread_in_Java 450 // Detect CPU features. This is only done at the very start of the VM. Later, the 451 // VM_Version::is_determine_features_test_running() flag should be false. 452 453 if (sig == SIGILL && VM_Version::is_determine_features_test_running()) { 454 // SIGILL must be caused by VM_Version::determine_features(). 455 *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL, 456 // flushing of icache is not necessary. 457 stub = pc + 4; // continue with next instruction. 458 goto run_stub; 459 } 460 else if (sig == SIGBUS && thread->doing_unsafe_access()) { 461 address next_pc = pc + 4; 462 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 463 os::Aix::ucontext_set_pc(uc, next_pc); 464 return 1; 465 } 466 } 467 468 // Check to see if we caught the safepoint code in the 469 // process of write protecting the memory serialization page. 470 // It write enables the page immediately after protecting it 471 // so we can just return to retry the write. 472 if ((sig == SIGSEGV) && 473 os::is_memory_serialize_page(thread, addr)) { 474 // Synchronization problem in the pseudo memory barrier code (bug id 6546278) 475 // Block current thread until the memory serialize page permission restored. 476 os::block_on_serialize_page_trap(); 477 return true; 478 } 479 } 480 481 run_stub: 482 483 // One of the above code blocks ininitalized the stub, so we want to 484 // delegate control to that stub. 485 if (stub != NULL) { 486 // Save all thread context in case we need to restore it. 487 if (thread != NULL) thread->set_saved_exception_pc(pc); 488 os::Aix::ucontext_set_pc(uc, stub); 489 return 1; 490 } 491 492 run_chained_handler: 493 494 // signal-chaining 495 if (os::Aix::chained_handler(sig, info, ucVoid)) { 496 return 1; 497 } 498 if (!abort_if_unrecognized) { 499 // caller wants another chance, so give it to him 500 return 0; 501 } 502 503 report_and_die: 504 505 // Use sigthreadmask instead of sigprocmask on AIX and unmask current signal. 506 sigset_t newset; 507 sigemptyset(&newset); 508 sigaddset(&newset, sig); 509 sigthreadmask(SIG_UNBLOCK, &newset, NULL); 510 511 VMError::report_and_die(t, sig, pc, info, ucVoid); 512 513 ShouldNotReachHere(); 514 return 0; 515 } 516 517 void os::Aix::init_thread_fpu_state(void) { 518 #if !defined(USE_XLC_BUILTINS) 519 // Disable FP exceptions. 520 __asm__ __volatile__ ("mtfsfi 6,0"); 521 #else 522 __mtfsfi(6, 0); 523 #endif 524 } 525 526 //////////////////////////////////////////////////////////////////////////////// 527 // thread stack 528 529 // Minimum usable stack sizes required to get to user code. Space for 530 // HotSpot guard pages is added later. 531 size_t os::Posix::_compiler_thread_min_stack_allowed = 192 * K; 532 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; 533 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K; 534 535 // Return default stack size for thr_type. 536 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 537 // Default stack size (compiler thread needs larger stack). 538 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 539 return s; 540 } 541 542 ///////////////////////////////////////////////////////////////////////////// 543 // helper functions for fatal error handler 544 545 void os::print_context(outputStream *st, const void *context) { 546 if (context == NULL) return; 547 548 const ucontext_t* uc = (const ucontext_t*)context; 549 550 st->print_cr("Registers:"); 551 st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.iar); 552 st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.lr); 553 st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.ctr); 554 st->cr(); 555 for (int i = 0; i < 32; i++) { 556 st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.jmp_context.gpr[i]); 557 if (i % 3 == 2) st->cr(); 558 } 559 st->cr(); 560 st->cr(); 561 562 intptr_t *sp = (intptr_t *)os::Aix::ucontext_get_sp(uc); 563 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 564 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t)); 565 st->cr(); 566 567 // Note: it may be unsafe to inspect memory near pc. For example, pc may 568 // point to garbage if entry point in an nmethod is corrupted. Leave 569 // this at the end, and hope for the best. 570 address pc = os::Aix::ucontext_get_pc(uc); 571 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 572 print_hex_dump(st, pc - 64, pc + 64, /*instrsize=*/4); 573 st->cr(); 574 575 // Try to decode the instructions. 576 st->print_cr("Decoded instructions: (pc=" PTR_FORMAT ")", pc); 577 st->print("<TODO: PPC port - print_context>"); 578 // TODO: PPC port Disassembler::decode(pc, 16, 16, st); 579 st->cr(); 580 } 581 582 void os::print_register_info(outputStream *st, const void *context) { 583 if (context == NULL) return; 584 585 ucontext_t *uc = (ucontext_t*)context; 586 587 st->print_cr("Register to memory mapping:"); 588 st->cr(); 589 590 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.iar); 591 st->print("lr ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.lr); 592 st->print("sp ="); print_location(st, (intptr_t)os::Aix::ucontext_get_sp(uc)); 593 for (int i = 0; i < 32; i++) { 594 st->print("r%-2d=", i); 595 print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.gpr[i]); 596 } 597 598 st->cr(); 599 } 600 601 extern "C" { 602 int SpinPause() { 603 return 0; 604 } 605 } 606 607 #ifndef PRODUCT 608 void os::verify_stack_alignment() { 609 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 610 } 611 #endif 612 613 int os::extra_bang_size_in_bytes() { 614 // PPC does not require the additional stack bang. 615 return 0; 616 } 617 618 bool os::platform_print_native_stack(outputStream* st, void* context, char *buf, int buf_size) { 619 AixNativeCallstack::print_callstack_for_context(st, (const ucontext_t*)context, true, buf, (size_t) buf_size); 620 return true; 621 } 622 623