1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2018 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.inline.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/javaCalls.hpp" 48 #include "runtime/mutexLocker.hpp" 49 #include "runtime/osThread.hpp" 50 #include "runtime/safepointMechanism.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 // Frame information (pc, sp, fp) retrieved via ucontext 89 // always looks like a C-frame according to the frame 90 // conventions in frame_ppc.hpp. 91 92 address os::Aix::ucontext_get_pc(const ucontext_t * uc) { 93 return (address)uc->uc_mcontext.jmp_context.iar; 94 } 95 96 intptr_t* os::Aix::ucontext_get_sp(const ucontext_t * uc) { 97 // gpr1 holds the stack pointer on aix 98 return (intptr_t*)uc->uc_mcontext.jmp_context.gpr[1/*REG_SP*/]; 99 } 100 101 intptr_t* os::Aix::ucontext_get_fp(const ucontext_t * uc) { 102 return NULL; 103 } 104 105 void os::Aix::ucontext_set_pc(ucontext_t* uc, address new_pc) { 106 uc->uc_mcontext.jmp_context.iar = (uint64_t) new_pc; 107 } 108 109 static address ucontext_get_lr(const ucontext_t * uc) { 110 return (address)uc->uc_mcontext.jmp_context.lr; 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 address lr = ucontext_get_lr(uc); 170 *fr = frame(sp, lr); 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 sender of current topframe which hopefully 196 // both have pc != NULL. 197 frame tmp = os::get_sender_for_C_frame(&topframe); 198 return os::get_sender_for_C_frame(&tmp); 199 } 200 201 // Utility functions 202 203 extern "C" JNIEXPORT int 204 JVM_handle_aix_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) { 205 206 ucontext_t* uc = (ucontext_t*) ucVoid; 207 208 Thread* t = Thread::current_or_null_safe(); 209 210 SignalHandlerMark shm(t); 211 212 // Note: it's not uncommon that JNI code uses signal/sigset to install 213 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 214 // or have a SIGILL handler when detecting CPU type). When that happens, 215 // JVM_handle_aix_signal() might be invoked with junk info/ucVoid. To 216 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 217 // that do not require siginfo/ucontext first. 218 219 if (sig == SIGPIPE) { 220 if (os::Aix::chained_handler(sig, info, ucVoid)) { 221 return 1; 222 } else { 223 // Ignoring SIGPIPE - see bugs 4229104 224 return 1; 225 } 226 } 227 228 JavaThread* thread = NULL; 229 VMThread* vmthread = NULL; 230 if (os::Aix::signal_handlers_are_installed) { 231 if (t != NULL) { 232 if(t->is_Java_thread()) { 233 thread = (JavaThread*)t; 234 } 235 else if(t->is_VM_thread()) { 236 vmthread = (VMThread *)t; 237 } 238 } 239 } 240 241 // Decide if this trap can be handled by a stub. 242 address stub = NULL; 243 244 // retrieve program counter 245 address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL; 246 247 // retrieve crash address 248 address const addr = info ? (const address) info->si_addr : NULL; 249 250 // SafeFetch 32 handling: 251 // - make it work if _thread is null 252 // - make it use the standard os::...::ucontext_get/set_pc APIs 253 if (uc) { 254 address const pc = os::Aix::ucontext_get_pc(uc); 255 if (pc && StubRoutines::is_safefetch_fault(pc)) { 256 os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 257 return true; 258 } 259 } 260 261 if (info == NULL || uc == NULL || thread == NULL && vmthread == NULL) { 262 goto run_chained_handler; 263 } 264 265 // If we are a java thread... 266 if (thread != NULL) { 267 268 // Handle ALL stack overflow variations here 269 if (sig == SIGSEGV && thread->on_local_stack(addr)) { 270 // stack overflow 271 // 272 // If we are in a yellow zone and we are inside java, we disable the yellow zone and 273 // throw a stack overflow exception. 274 // If we are in native code or VM C code, we report-and-die. The original coding tried 275 // to continue with yellow zone disabled, but that doesn't buy us much and prevents 276 // hs_err_pid files. 277 if (thread->in_stack_yellow_reserved_zone(addr)) { 278 if (thread->thread_state() == _thread_in_Java) { 279 if (thread->in_stack_reserved_zone(addr)) { 280 frame fr; 281 if (os::Aix::get_frame_at_stack_banging_point(thread, uc, &fr)) { 282 assert(fr.is_java_frame(), "Must be a Javac frame"); 283 frame activation = 284 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 285 if (activation.sp() != NULL) { 286 thread->disable_stack_reserved_zone(); 287 if (activation.is_interpreted_frame()) { 288 thread->set_reserved_stack_activation((address)activation.fp()); 289 } else { 290 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 291 } 292 return 1; 293 } 294 } 295 } 296 // Throw a stack overflow exception. 297 // Guard pages will be reenabled while unwinding the stack. 298 thread->disable_stack_yellow_reserved_zone(); 299 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 300 goto run_stub; 301 } else { 302 // Thread was in the vm or native code. Return and try to finish. 303 thread->disable_stack_yellow_reserved_zone(); 304 return 1; 305 } 306 } else if (thread->in_stack_red_zone(addr)) { 307 // Fatal red zone violation. Disable the guard pages and fall through 308 // to handle_unexpected_exception way down below. 309 thread->disable_stack_red_zone(); 310 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 311 goto report_and_die; 312 } else { 313 // This means a segv happened inside our stack, but not in 314 // the guarded zone. I'd like to know when this happens, 315 tty->print_raw_cr("SIGSEGV happened inside stack but outside yellow and red zone."); 316 goto report_and_die; 317 } 318 319 } // end handle SIGSEGV inside stack boundaries 320 321 if (thread->thread_state() == _thread_in_Java) { 322 // Java thread running in Java code 323 324 // The following signals are used for communicating VM events: 325 // 326 // SIGILL: the compiler generates illegal opcodes 327 // at places where it wishes to interrupt the VM: 328 // Safepoints, Unreachable Code, Entry points of Zombie methods, 329 // This results in a SIGILL with (*pc) == inserted illegal instruction. 330 // 331 // (so, SIGILLs with a pc inside the zero page are real errors) 332 // 333 // SIGTRAP: 334 // The ppc trap instruction raises a SIGTRAP and is very efficient if it 335 // does not trap. It is used for conditional branches that are expected 336 // to be never taken. These are: 337 // - zombie methods 338 // - IC (inline cache) misses. 339 // - null checks leading to UncommonTraps. 340 // - range checks leading to Uncommon Traps. 341 // On Aix, these are especially null checks, as the ImplicitNullCheck 342 // optimization works only in rare cases, as the page at address 0 is only 343 // write protected. // 344 // Note: !UseSIGTRAP is used to prevent SIGTRAPS altogether, to facilitate debugging. 345 // 346 // SIGSEGV: 347 // used for safe point polling: 348 // To notify all threads that they have to reach a safe point, safe point polling is used: 349 // All threads poll a certain mapped memory page. Normally, this page has read access. 350 // If the VM wants to inform the threads about impending safe points, it puts this 351 // page to read only ("poisens" the page), and the threads then reach a safe point. 352 // used for null checks: 353 // If the compiler finds a store it uses it for a null check. Unfortunately this 354 // happens rarely. In heap based and disjoint base compressd oop modes also loads 355 // are used for null checks. 356 357 // A VM-related SIGILL may only occur if we are not in the zero page. 358 // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else 359 // in the zero page, because it is filled with 0x0. We ignore 360 // explicit SIGILLs in the zero page. 361 if (sig == SIGILL && (pc < (address) 0x200)) { 362 if (TraceTraps) { 363 tty->print_raw_cr("SIGILL happened inside zero page."); 364 } 365 goto report_and_die; 366 } 367 368 // Handle signal from NativeJump::patch_verified_entry(). 369 if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) || 370 (!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) { 371 if (TraceTraps) { 372 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); 373 } 374 stub = SharedRuntime::get_handle_wrong_method_stub(); 375 goto run_stub; 376 } 377 378 else if ((SafepointMechanism::uses_thread_local_poll() && USE_POLL_BIT_ONLY) 379 ? (sig == SIGTRAP && ((NativeInstruction*)pc)->is_safepoint_poll()) 380 : (sig == SIGSEGV && os::is_poll_address(addr))) { 381 if (TraceTraps) { 382 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (%s)", p2i(pc), 383 (SafepointMechanism::uses_thread_local_poll() && USE_POLL_BIT_ONLY) ? "SIGTRAP" : "SIGSEGV"); 384 } 385 stub = SharedRuntime::get_poll_stub(pc); 386 goto run_stub; 387 } 388 389 // SIGTRAP-based ic miss check in compiled code. 390 else if (sig == SIGTRAP && TrapBasedICMissChecks && 391 nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) { 392 if (TraceTraps) { 393 tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 394 } 395 stub = SharedRuntime::get_ic_miss_stub(); 396 goto run_stub; 397 } 398 399 // SIGTRAP-based implicit null check in compiled code. 400 else if (sig == SIGTRAP && TrapBasedNullChecks && 401 nativeInstruction_at(pc)->is_sigtrap_null_check()) { 402 if (TraceTraps) { 403 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 404 } 405 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 406 goto run_stub; 407 } 408 409 // SIGSEGV-based implicit null check in compiled code. 410 else if (sig == SIGSEGV && ImplicitNullChecks && 411 CodeCache::contains((void*) pc) && 412 MacroAssembler::uses_implicit_null_check(info->si_addr)) { 413 if (TraceTraps) { 414 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc); 415 } 416 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 417 } 418 419 #ifdef COMPILER2 420 // SIGTRAP-based implicit range check in compiled code. 421 else if (sig == SIGTRAP && TrapBasedRangeChecks && 422 nativeInstruction_at(pc)->is_sigtrap_range_check()) { 423 if (TraceTraps) { 424 tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", pc); 425 } 426 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 427 goto run_stub; 428 } 429 #endif 430 431 else if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { 432 if (TraceTraps) { 433 tty->print_raw_cr("Fix SIGFPE handler, trying divide by zero handler."); 434 } 435 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 436 goto run_stub; 437 } 438 439 else if (sig == SIGBUS) { 440 // BugId 4454115: A read from a MappedByteBuffer can fault here if the 441 // underlying file has been truncated. Do not crash the VM in such a case. 442 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 443 CompiledMethod* nm = cb->as_compiled_method_or_null(); 444 bool is_unsafe_arraycopy = (thread->doing_unsafe_access() && UnsafeCopyMemory::contains_pc(pc)); 445 if ((nm != NULL && nm->has_unsafe_access()) || is_unsafe_arraycopy) { 446 address next_pc = pc + 4; 447 if (is_unsafe_arraycopy) { 448 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc); 449 } 450 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 451 os::Aix::ucontext_set_pc(uc, next_pc); 452 return 1; 453 } 454 } 455 } 456 457 else { // thread->thread_state() != _thread_in_Java 458 // Detect CPU features. This is only done at the very start of the VM. Later, the 459 // VM_Version::is_determine_features_test_running() flag should be false. 460 461 if (sig == SIGILL && VM_Version::is_determine_features_test_running()) { 462 // SIGILL must be caused by VM_Version::determine_features(). 463 *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL, 464 // flushing of icache is not necessary. 465 stub = pc + 4; // continue with next instruction. 466 goto run_stub; 467 } 468 else if ((thread->thread_state() == _thread_in_vm || 469 thread->thread_state() == _thread_in_native) && 470 sig == SIGBUS && thread->doing_unsafe_access()) { 471 address next_pc = pc + 4; 472 if (UnsafeCopyMemory::contains_pc(pc)) { 473 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc); 474 } 475 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 476 os::Aix::ucontext_set_pc(uc, next_pc); 477 return 1; 478 } 479 } 480 481 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 482 // and the heap gets shrunk before the field access. 483 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 484 address addr = JNI_FastGetField::find_slowcase_pc(pc); 485 if (addr != (address)-1) { 486 stub = addr; 487 } 488 } 489 } 490 491 run_stub: 492 493 // One of the above code blocks ininitalized the stub, so we want to 494 // delegate control to that stub. 495 if (stub != NULL) { 496 // Save all thread context in case we need to restore it. 497 if (thread != NULL) thread->set_saved_exception_pc(pc); 498 os::Aix::ucontext_set_pc(uc, stub); 499 return 1; 500 } 501 502 run_chained_handler: 503 504 // signal-chaining 505 if (os::Aix::chained_handler(sig, info, ucVoid)) { 506 return 1; 507 } 508 if (!abort_if_unrecognized) { 509 // caller wants another chance, so give it to him 510 return 0; 511 } 512 513 report_and_die: 514 515 // Use sigthreadmask instead of sigprocmask on AIX and unmask current signal. 516 sigset_t newset; 517 sigemptyset(&newset); 518 sigaddset(&newset, sig); 519 sigthreadmask(SIG_UNBLOCK, &newset, NULL); 520 521 VMError::report_and_die(t, sig, pc, info, ucVoid); 522 523 ShouldNotReachHere(); 524 return 0; 525 } 526 527 void os::Aix::init_thread_fpu_state(void) { 528 #if !defined(USE_XLC_BUILTINS) 529 // Disable FP exceptions. 530 __asm__ __volatile__ ("mtfsfi 6,0"); 531 #else 532 __mtfsfi(6, 0); 533 #endif 534 } 535 536 //////////////////////////////////////////////////////////////////////////////// 537 // thread stack 538 539 // Minimum usable stack sizes required to get to user code. Space for 540 // HotSpot guard pages is added later. 541 size_t os::Posix::_compiler_thread_min_stack_allowed = 192 * K; 542 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; 543 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K; 544 545 // Return default stack size for thr_type. 546 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 547 // Default stack size (compiler thread needs larger stack). 548 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 549 return s; 550 } 551 552 ///////////////////////////////////////////////////////////////////////////// 553 // helper functions for fatal error handler 554 555 void os::print_context(outputStream *st, const void *context) { 556 if (context == NULL) return; 557 558 const ucontext_t* uc = (const ucontext_t*)context; 559 560 st->print_cr("Registers:"); 561 st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.iar); 562 st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.lr); 563 st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.ctr); 564 st->cr(); 565 for (int i = 0; i < 32; i++) { 566 st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.jmp_context.gpr[i]); 567 if (i % 3 == 2) st->cr(); 568 } 569 st->cr(); 570 st->cr(); 571 572 intptr_t *sp = (intptr_t *)os::Aix::ucontext_get_sp(uc); 573 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 574 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t)); 575 st->cr(); 576 577 // Note: it may be unsafe to inspect memory near pc. For example, pc may 578 // point to garbage if entry point in an nmethod is corrupted. Leave 579 // this at the end, and hope for the best. 580 address pc = os::Aix::ucontext_get_pc(uc); 581 print_instructions(st, pc, /*instrsize=*/4); 582 st->cr(); 583 584 // Try to decode the instructions. 585 st->print_cr("Decoded instructions: (pc=" PTR_FORMAT ")", pc); 586 st->print("<TODO: PPC port - print_context>"); 587 // TODO: PPC port Disassembler::decode(pc, 16, 16, st); 588 st->cr(); 589 } 590 591 void os::print_register_info(outputStream *st, const void *context) { 592 if (context == NULL) return; 593 594 ucontext_t *uc = (ucontext_t*)context; 595 596 st->print_cr("Register to memory mapping:"); 597 st->cr(); 598 599 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.iar); 600 st->print("lr ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.lr); 601 st->print("sp ="); print_location(st, (intptr_t)os::Aix::ucontext_get_sp(uc)); 602 for (int i = 0; i < 32; i++) { 603 st->print("r%-2d=", i); 604 print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.gpr[i]); 605 } 606 607 st->cr(); 608 } 609 610 extern "C" { 611 int SpinPause() { 612 return 0; 613 } 614 } 615 616 #ifndef PRODUCT 617 void os::verify_stack_alignment() { 618 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 619 } 620 #endif 621 622 int os::extra_bang_size_in_bytes() { 623 // PPC does not require the additional stack bang. 624 return 0; 625 } 626 627 bool os::platform_print_native_stack(outputStream* st, void* context, char *buf, int buf_size) { 628 AixNativeCallstack::print_callstack_for_context(st, (const ucontext_t*)context, true, buf, (size_t) buf_size); 629 return true; 630 }