phh@568: /*
mikael@6198:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
phh@568:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
phh@568:  *
phh@568:  * This code is free software; you can redistribute it and/or modify it
phh@568:  * under the terms of the GNU General Public License version 2 only, as
phh@568:  * published by the Free Software Foundation.
phh@568:  *
phh@568:  * This code is distributed in the hope that it will be useful, but WITHOUT
phh@568:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
phh@568:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
phh@568:  * version 2 for more details (a copy is included in the LICENSE file that
phh@568:  * accompanied this code).
phh@568:  *
phh@568:  * You should have received a copy of the GNU General Public License version
phh@568:  * 2 along with this work; if not, write to the Free Software Foundation,
phh@568:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
phh@568:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
phh@568:  *
phh@568:  */
phh@568: 
stefank@2314: // no precompiled headers
twisti@4323: #include "asm/macroAssembler.hpp"
stefank@2314: #include "classfile/classLoader.hpp"
stefank@2314: #include "classfile/systemDictionary.hpp"
stefank@2314: #include "classfile/vmSymbols.hpp"
stefank@2314: #include "code/icBuffer.hpp"
stefank@2314: #include "code/vtableStubs.hpp"
stefank@2314: #include "interpreter/interpreter.hpp"
stefank@2314: #include "jvm_linux.h"
stefank@2314: #include "memory/allocation.inline.hpp"
stefank@2314: #include "mutex_linux.inline.hpp"
stefank@2314: #include "nativeInst_sparc.hpp"
stefank@2314: #include "os_share_linux.hpp"
stefank@2314: #include "prims/jniFastGetField.hpp"
stefank@2314: #include "prims/jvm.h"
stefank@2314: #include "prims/jvm_misc.hpp"
stefank@2314: #include "runtime/arguments.hpp"
stefank@2314: #include "runtime/extendedPC.hpp"
stefank@2314: #include "runtime/frame.inline.hpp"
stefank@2314: #include "runtime/interfaceSupport.hpp"
stefank@2314: #include "runtime/java.hpp"
stefank@2314: #include "runtime/javaCalls.hpp"
stefank@2314: #include "runtime/mutexLocker.hpp"
stefank@2314: #include "runtime/osThread.hpp"
stefank@2314: #include "runtime/sharedRuntime.hpp"
stefank@2314: #include "runtime/stubRoutines.hpp"
stefank@4299: #include "runtime/thread.inline.hpp"
stefank@2314: #include "runtime/timer.hpp"
stefank@2314: #include "utilities/events.hpp"
stefank@2314: #include "utilities/vmError.hpp"
phh@568: 
phh@568: // Linux/Sparc has rather obscure naming of registers in sigcontext
phh@568: // different between 32 and 64 bits
phh@568: #ifdef _LP64
phh@568: #define SIG_PC(x) ((x)->sigc_regs.tpc)
phh@568: #define SIG_NPC(x) ((x)->sigc_regs.tnpc)
phh@568: #define SIG_REGS(x) ((x)->sigc_regs)
phh@568: #else
phh@568: #define SIG_PC(x) ((x)->si_regs.pc)
phh@568: #define SIG_NPC(x) ((x)->si_regs.npc)
phh@568: #define SIG_REGS(x) ((x)->si_regs)
phh@568: #endif
phh@568: 
phh@568: // those are to reference registers in sigcontext
phh@568: enum {
phh@568:   CON_G0 = 0,
phh@568:   CON_G1,
phh@568:   CON_G2,
phh@568:   CON_G3,
phh@568:   CON_G4,
phh@568:   CON_G5,
phh@568:   CON_G6,
phh@568:   CON_G7,
phh@568:   CON_O0,
phh@568:   CON_O1,
phh@568:   CON_O2,
phh@568:   CON_O3,
phh@568:   CON_O4,
phh@568:   CON_O5,
phh@568:   CON_O6,
phh@568:   CON_O7,
phh@568: };
phh@568: 
phh@568: static inline void set_cont_address(sigcontext* ctx, address addr) {
phh@568:   SIG_PC(ctx)  = (intptr_t)addr;
phh@568:   SIG_NPC(ctx) = (intptr_t)(addr+4);
phh@568: }
phh@568: 
phh@568: // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
phh@568: // currently interrupted by SIGPROF.
phh@568: // os::Solaris::fetch_frame_from_ucontext() tries to skip nested
phh@568: // signal frames. Currently we don't do that on Linux, so it's the
phh@568: // same as os::fetch_frame_from_context().
phh@568: ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
phh@568:                                                 ucontext_t* uc,
phh@568:                                                 intptr_t** ret_sp,
phh@568:                                                 intptr_t** ret_fp) {
phh@568:   assert(thread != NULL, "just checking");
phh@568:   assert(ret_sp != NULL, "just checking");
phh@568:   assert(ret_fp != NULL, "just checking");
phh@568: 
phh@568:   return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
phh@568: }
phh@568: 
phh@568: ExtendedPC os::fetch_frame_from_context(void* ucVoid,
phh@568:                                         intptr_t** ret_sp,
phh@568:                                         intptr_t** ret_fp) {
phh@568:   ucontext_t* uc = (ucontext_t*) ucVoid;
phh@568:   ExtendedPC  epc;
phh@568: 
phh@568:   if (uc != NULL) {
phh@568:     epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
phh@568:     if (ret_sp) {
phh@568:       *ret_sp = os::Linux::ucontext_get_sp(uc);
phh@568:     }
phh@568:     if (ret_fp) {
zgu@6921:       *ret_fp = (intptr_t*)NULL;
phh@568:     }
phh@568:   } else {
phh@568:     // construct empty ExtendedPC for return value checking
phh@568:     epc = ExtendedPC(NULL);
phh@568:     if (ret_sp) {
phh@568:       *ret_sp = (intptr_t*) NULL;
phh@568:     }
phh@568:     if (ret_fp) {
phh@568:       *ret_fp = (intptr_t*) NULL;
phh@568:     }
phh@568:   }
phh@568: 
phh@568:   return epc;
phh@568: }
phh@568: 
phh@568: frame os::fetch_frame_from_context(void* ucVoid) {
phh@568:   intptr_t* sp;
zgu@6921:   ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL);
zgu@6921:   return frame(sp, frame::unpatchable, epc.pc());
phh@568: }
phh@568: 
phh@568: frame os::get_sender_for_C_frame(frame* fr) {
zgu@6920:   return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc());
phh@568: }
phh@568: 
phh@568: frame os::current_frame() {
phh@568:   intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
phh@568:   frame myframe(sp, frame::unpatchable,
phh@568:                 CAST_FROM_FN_PTR(address, os::current_frame));
phh@568:   if (os::is_first_C_frame(&myframe)) {
phh@568:     // stack is not walkable
phh@568:     return frame(NULL, frame::unpatchable, NULL);
phh@568:   } else {
phh@568:     return os::get_sender_for_C_frame(&myframe);
phh@568:   }
phh@568: }
phh@568: 
phh@568: address os::current_stack_pointer() {
phh@568:   register void *sp __asm__ ("sp");
phh@568:   return (address)sp;
phh@568: }
phh@568: 
phh@568: static void current_stack_region(address* bottom, size_t* size) {
phh@568:   if (os::Linux::is_initial_thread()) {
phh@568:     // initial thread needs special handling because pthread_getattr_np()
phh@568:     // may return bogus value.
phh@568:     *bottom = os::Linux::initial_thread_stack_bottom();
phh@568:     *size = os::Linux::initial_thread_stack_size();
phh@568:   } else {
phh@568:     pthread_attr_t attr;
phh@568: 
phh@568:     int rslt = pthread_getattr_np(pthread_self(), &attr);
phh@568: 
phh@568:     // JVM needs to know exact stack location, abort if it fails
phh@568:     if (rslt != 0) {
phh@568:       if (rslt == ENOMEM) {
ccheung@4993:         vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np");
phh@568:       } else {
jcoomes@1845:         fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt));
phh@568:       }
phh@568:     }
phh@568: 
phh@568:     if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) {
phh@568:       fatal("Can not locate current stack attributes!");
phh@568:     }
phh@568: 
phh@568:     pthread_attr_destroy(&attr);
phh@568:   }
phh@568:   assert(os::current_stack_pointer() >= *bottom &&
phh@568:          os::current_stack_pointer() < *bottom + *size, "just checking");
phh@568: }
phh@568: 
phh@568: address os::current_stack_base() {
phh@568:   address bottom;
phh@568:   size_t size;
phh@568:   current_stack_region(&bottom, &size);
phh@568:   return bottom + size;
phh@568: }
phh@568: 
phh@568: size_t os::current_stack_size() {
phh@568:   // stack size includes normal stack and HotSpot guard pages
phh@568:   address bottom;
phh@568:   size_t size;
phh@568:   current_stack_region(&bottom, &size);
phh@568:   return size;
phh@568: }
phh@568: 
phh@568: char* os::non_memory_address_word() {
phh@568:   // Must never look like an address returned by reserve_memory,
phh@568:   // even in its subfields (as defined by the CPU immediate fields,
phh@568:   // if the CPU splits constants across multiple instructions).
phh@568:   // On SPARC, 0 != %hi(any real address), because there is no
phh@568:   // allocation in the first 1Kb of the virtual address space.
phh@568:   return (char*) 0;
phh@568: }
phh@568: 
zgu@4079: void os::initialize_thread(Thread* thr) {}
phh@568: 
phh@568: void os::print_context(outputStream *st, void *context) {
phh@568:   if (context == NULL) return;
phh@568: 
phh@568:   ucontext_t* uc = (ucontext_t*)context;
phh@568:   sigcontext* sc = (sigcontext*)context;
phh@568:   st->print_cr("Registers:");
phh@568: 
never@2262:   st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT
never@2262:                " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT,
never@2262:                SIG_REGS(sc).u_regs[CON_G1],
never@2262:                SIG_REGS(sc).u_regs[CON_G2],
never@2262:                SIG_REGS(sc).u_regs[CON_G3],
never@2262:                SIG_REGS(sc).u_regs[CON_G4]);
never@2262:   st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT
never@2262:                " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT,
never@2262:                SIG_REGS(sc).u_regs[CON_G5],
never@2262:                SIG_REGS(sc).u_regs[CON_G6],
never@2262:                SIG_REGS(sc).u_regs[CON_G7],
never@2262:                SIG_REGS(sc).y);
phh@568:   st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT
phh@568:                " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT,
phh@568:                SIG_REGS(sc).u_regs[CON_O0],
phh@568:                SIG_REGS(sc).u_regs[CON_O1],
phh@568:                SIG_REGS(sc).u_regs[CON_O2],
phh@568:                SIG_REGS(sc).u_regs[CON_O3]);
phh@568:   st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT
phh@568:                " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT,
phh@568:                SIG_REGS(sc).u_regs[CON_O4],
phh@568:                SIG_REGS(sc).u_regs[CON_O5],
phh@568:                SIG_REGS(sc).u_regs[CON_O6],
phh@568:                SIG_REGS(sc).u_regs[CON_O7]);
phh@568: 
never@2262: 
never@2262:   intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
never@2262:   st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT
never@2262:                " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT,
never@2262:                sp[L0->sp_offset_in_saved_window()],
never@2262:                sp[L1->sp_offset_in_saved_window()],
never@2262:                sp[L2->sp_offset_in_saved_window()],
never@2262:                sp[L3->sp_offset_in_saved_window()]);
never@2262:   st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT
never@2262:                " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT,
never@2262:                sp[L4->sp_offset_in_saved_window()],
never@2262:                sp[L5->sp_offset_in_saved_window()],
never@2262:                sp[L6->sp_offset_in_saved_window()],
never@2262:                sp[L7->sp_offset_in_saved_window()]);
never@2262:   st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT
never@2262:                " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT,
never@2262:                sp[I0->sp_offset_in_saved_window()],
never@2262:                sp[I1->sp_offset_in_saved_window()],
never@2262:                sp[I2->sp_offset_in_saved_window()],
never@2262:                sp[I3->sp_offset_in_saved_window()]);
never@2262:   st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT
never@2262:                " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT,
never@2262:                sp[I4->sp_offset_in_saved_window()],
never@2262:                sp[I5->sp_offset_in_saved_window()],
never@2262:                sp[I6->sp_offset_in_saved_window()],
never@2262:                sp[I7->sp_offset_in_saved_window()]);
phh@568: 
phh@568:   st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT,
phh@568:                SIG_PC(sc),
phh@568:                SIG_NPC(sc));
phh@568:   st->cr();
phh@568:   st->cr();
phh@568: 
phh@568:   st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
phh@568:   print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
phh@568:   st->cr();
phh@568: 
phh@568:   // Note: it may be unsafe to inspect memory near pc. For example, pc may
phh@568:   // point to garbage if entry point in an nmethod is corrupted. Leave
phh@568:   // this at the end, and hope for the best.
phh@568:   address pc = os::Linux::ucontext_get_pc(uc);
phh@568:   st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
never@2262:   print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
never@2262: }
never@2262: 
never@2262: 
never@2262: void os::print_register_info(outputStream *st, void *context) {
never@2262:   if (context == NULL) return;
never@2262: 
never@2262:   ucontext_t *uc = (ucontext_t*)context;
mikael@6683:   sigcontext* sc = (sigcontext*)context;
never@2262:   intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
never@2262: 
never@2262:   st->print_cr("Register to memory mapping:");
never@2262:   st->cr();
never@2262: 
never@2262:   // this is only for the "general purpose" registers
mikael@6683:   st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]);
mikael@6683:   st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]);
mikael@6683:   st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]);
mikael@6683:   st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]);
mikael@6683:   st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]);
mikael@6683:   st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]);
mikael@6683:   st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]);
never@2262:   st->cr();
never@2262: 
mikael@6683:   st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]);
mikael@6683:   st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]);
mikael@6683:   st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]);
mikael@6683:   st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]);
mikael@6683:   st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]);
mikael@6683:   st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]);
mikael@6683:   st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]);
mikael@6683:   st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]);
never@2262:   st->cr();
never@2262: 
never@2262:   st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]);
never@2262:   st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]);
never@2262:   st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]);
never@2262:   st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]);
never@2262:   st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]);
never@2262:   st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]);
never@2262:   st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]);
never@2262:   st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]);
never@2262:   st->cr();
never@2262: 
never@2262:   st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]);
never@2262:   st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]);
never@2262:   st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]);
never@2262:   st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]);
never@2262:   st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]);
never@2262:   st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]);
never@2262:   st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]);
never@2262:   st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]);
never@2262:   st->cr();
phh@568: }
phh@568: 
phh@568: 
phh@568: address os::Linux::ucontext_get_pc(ucontext_t* uc) {
phh@568:   return (address) SIG_PC((sigcontext*)uc);
phh@568: }
phh@568: 
phh@568: intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) {
phh@568:   return (intptr_t*)
phh@568:     ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS);
phh@568: }
phh@568: 
phh@568: // not used on Sparc
phh@568: intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) {
phh@568:   ShouldNotReachHere();
phh@568:   return NULL;
phh@568: }
phh@568: 
phh@568: // Utility functions
phh@568: 
phh@568: inline static bool checkPrefetch(sigcontext* uc, address pc) {
goetz@5400:   if (StubRoutines::is_safefetch_fault(pc)) {
goetz@5400:     set_cont_address(uc, address(StubRoutines::continuation_for_safefetch_fault(pc)));
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkOverflow(sigcontext* uc,
phh@568:                                  address pc,
phh@568:                                  address addr,
phh@568:                                  JavaThread* thread,
phh@568:                                  address* stub) {
phh@568:   // check if fault address is within thread stack
phh@568:   if (addr < thread->stack_base() &&
phh@568:       addr >= thread->stack_base() - thread->stack_size()) {
phh@568:     // stack overflow
phh@568:     if (thread->in_stack_yellow_zone(addr)) {
phh@568:       thread->disable_stack_yellow_zone();
phh@568:       if (thread->thread_state() == _thread_in_Java) {
phh@568:         // Throw a stack overflow exception.  Guard pages will be reenabled
phh@568:         // while unwinding the stack.
phh@568:         *stub =
phh@568:           SharedRuntime::continuation_for_implicit_exception(thread,
phh@568:                                                              pc,
phh@568:                                                              SharedRuntime::STACK_OVERFLOW);
phh@568:       } else {
phh@568:         // Thread was in the vm or native code.  Return and try to finish.
phh@568:         return true;
phh@568:       }
phh@568:     } else if (thread->in_stack_red_zone(addr)) {
phh@568:       // Fatal red zone violation.  Disable the guard pages and fall through
phh@568:       // to handle_unexpected_exception way down below.
phh@568:       thread->disable_stack_red_zone();
phh@568:       tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
iklam@4710: 
iklam@4710:       // This is a likely cause, but hard to verify. Let's just print
iklam@4710:       // it as a hint.
iklam@4710:       tty->print_raw_cr("Please check if any of your loaded .so files has "
iklam@4710:                         "enabled executable stack (see man page execstack(8))");
phh@568:     } else {
phh@568:       // Accessing stack address below sp may cause SEGV if current
phh@568:       // thread has MAP_GROWSDOWN stack. This should only happen when
phh@568:       // current thread was created by user code with MAP_GROWSDOWN flag
phh@568:       // and then attached to VM. See notes in os_linux.cpp.
phh@568:       if (thread->osthread()->expanding_stack() == 0) {
phh@568:         thread->osthread()->set_expanding_stack();
phh@568:         if (os::Linux::manually_expand_stack(thread, addr)) {
phh@568:           thread->osthread()->clear_expanding_stack();
phh@568:           return true;
phh@568:         }
phh@568:         thread->osthread()->clear_expanding_stack();
phh@568:       } else {
phh@568:         fatal("recursive segv. expanding stack.");
phh@568:       }
phh@568:     }
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkPollingPage(address pc, address fault, address* stub) {
phh@568:   if (fault == os::get_polling_page()) {
phh@568:     *stub = SharedRuntime::get_poll_stub(pc);
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkByteBuffer(address pc, address* stub) {
phh@568:   // BugId 4454115: A read from a MappedByteBuffer can fault
phh@568:   // here if the underlying file has been truncated.
phh@568:   // Do not crash the VM in such a case.
phh@568:   CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
phh@568:   nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
phh@568:   if (nm != NULL && nm->has_unsafe_access()) {
phh@568:     *stub = StubRoutines::handler_for_unsafe_access();
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkVerifyOops(address pc, address fault, address* stub) {
phh@568:   if (pc >= MacroAssembler::_verify_oop_implicit_branch[0]
phh@568:       && pc <  MacroAssembler::_verify_oop_implicit_branch[1] ) {
phh@568:     *stub     =  MacroAssembler::_verify_oop_implicit_branch[2];
phh@568:     warning("fixed up memory fault in +VerifyOops at address "
phh@568:             INTPTR_FORMAT, fault);
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkFPFault(address pc, int code,
phh@568:                                 JavaThread* thread, address* stub) {
phh@568:   if (code == FPE_INTDIV || code == FPE_FLTDIV) {
phh@568:     *stub =
phh@568:       SharedRuntime::
phh@568:       continuation_for_implicit_exception(thread,
phh@568:                                           pc,
phh@568:                                           SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkNullPointer(address pc, intptr_t fault,
phh@568:                                     JavaThread* thread, address* stub) {
phh@568:   if (!MacroAssembler::needs_explicit_null_check(fault)) {
phh@568:     // Determination of interpreter/vtable stub/compiled code null
phh@568:     // exception
phh@568:     *stub =
phh@568:       SharedRuntime::
phh@568:       continuation_for_implicit_exception(thread, pc,
phh@568:                                           SharedRuntime::IMPLICIT_NULL);
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkFastJNIAccess(address pc, address* stub) {
phh@568:   address addr = JNI_FastGetField::find_slowcase_pc(pc);
phh@568:   if (addr != (address)-1) {
phh@568:     *stub = addr;
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkSerializePage(JavaThread* thread, address addr) {
phh@568:   return os::is_memory_serialize_page(thread, addr);
phh@568: }
phh@568: 
phh@568: inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) {
phh@568:   if (nativeInstruction_at(*pc)->is_zombie()) {
phh@568:     // zombie method (ld [%g0],%o7 instruction)
phh@568:     *stub = SharedRuntime::get_handle_wrong_method_stub();
phh@568: 
phh@568:     // At the stub it needs to look like a call from the caller of this
phh@568:     // method (not a call from the segv site).
phh@568:     *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
phh@568:     return true;
phh@568:   }
phh@568:   return false;
phh@568: }
phh@568: 
phh@568: inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) {
phh@568: #ifdef COMPILER2
phh@568:   if (nativeInstruction_at(*pc)->is_ic_miss_trap()) {
phh@568: #ifdef ASSERT
phh@568: #ifdef TIERED
mikael@6683:     CodeBlob* cb = CodeCache::find_blob_unsafe(*pc);
phh@568:     assert(cb->is_compiled_by_c2(), "Wrong compiler");
phh@568: #endif // TIERED
phh@568: #endif // ASSERT
phh@568:     // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken.
phh@568:     *stub = SharedRuntime::get_ic_miss_stub();
phh@568:     // At the stub it needs to look like a call from the caller of this
phh@568:     // method (not a call from the segv site).
phh@568:     *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
phh@568:     return true;
phh@568:   }
phh@568: #endif  // COMPILER2
phh@568:   return false;
phh@568: }
phh@568: 
coleenp@2507: extern "C" JNIEXPORT int
phh@568: JVM_handle_linux_signal(int sig,
phh@568:                         siginfo_t* info,
phh@568:                         void* ucVoid,
phh@568:                         int abort_if_unrecognized) {
phh@568:   // in fact this isn't ucontext_t* at all, but struct sigcontext*
phh@568:   // but Linux porting layer uses ucontext_t, so to minimize code change
phh@568:   // we cast as needed
phh@568:   ucontext_t* ucFake = (ucontext_t*) ucVoid;
phh@568:   sigcontext* uc = (sigcontext*)ucVoid;
phh@568: 
phh@568:   Thread* t = ThreadLocalStorage::get_thread_slow();
phh@568: 
rbackman@5424:   // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
rbackman@5424:   // (no destructors can be run)
rbackman@5424:   os::WatcherThreadCrashProtection::check_crash_protection(sig, t);
rbackman@5424: 
phh@568:   SignalHandlerMark shm(t);
phh@568: 
phh@568:   // Note: it's not uncommon that JNI code uses signal/sigset to install
phh@568:   // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
phh@568:   // or have a SIGILL handler when detecting CPU type). When that happens,
phh@568:   // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
phh@568:   // avoid unnecessary crash when libjsig is not preloaded, try handle signals
phh@568:   // that do not require siginfo/ucontext first.
phh@568: 
phh@568:   if (sig == SIGPIPE || sig == SIGXFSZ) {
phh@568:     // allow chained handler to go first
phh@568:     if (os::Linux::chained_handler(sig, info, ucVoid)) {
phh@568:       return true;
phh@568:     } else {
phh@568:       if (PrintMiscellaneous && (WizardMode || Verbose)) {
phh@568:         char buf[64];
phh@568:         warning("Ignoring %s - see bugs 4229104 or 646499219",
phh@568:                 os::exception_name(sig, buf, sizeof(buf)));
phh@568:       }
phh@568:       return true;
phh@568:     }
phh@568:   }
phh@568: 
phh@568:   JavaThread* thread = NULL;
phh@568:   VMThread* vmthread = NULL;
phh@568:   if (os::Linux::signal_handlers_are_installed) {
phh@568:     if (t != NULL ){
phh@568:       if(t->is_Java_thread()) {
phh@568:         thread = (JavaThread*)t;
phh@568:       }
phh@568:       else if(t->is_VM_thread()){
phh@568:         vmthread = (VMThread *)t;
phh@568:       }
phh@568:     }
phh@568:   }
phh@568: 
phh@568:   // decide if this trap can be handled by a stub
phh@568:   address stub = NULL;
phh@568:   address pc = NULL;
phh@568:   address npc = NULL;
phh@568: 
phh@568:   //%note os_trap_1
phh@568:   if (info != NULL && uc != NULL && thread != NULL) {
phh@568:     pc = address(SIG_PC(uc));
phh@568:     npc = address(SIG_NPC(uc));
phh@568: 
phh@568:     // Check to see if we caught the safepoint code in the
phh@568:     // process of write protecting the memory serialization page.
phh@568:     // It write enables the page immediately after protecting it
phh@568:     // so we can just return to retry the write.
phh@568:     if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) {
phh@568:       // Block current thread until the memory serialize page permission restored.
phh@568:       os::block_on_serialize_page_trap();
phh@568:       return 1;
phh@568:     }
phh@568: 
phh@568:     if (checkPrefetch(uc, pc)) {
phh@568:       return 1;
phh@568:     }
phh@568: 
phh@568:     // Handle ALL stack overflow variations here
phh@568:     if (sig == SIGSEGV) {
phh@568:       if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) {
phh@568:         return 1;
phh@568:       }
phh@568:     }
phh@568: 
phh@568:     if (sig == SIGBUS &&
phh@568:         thread->thread_state() == _thread_in_vm &&
phh@568:         thread->doing_unsafe_access()) {
phh@568:       stub = StubRoutines::handler_for_unsafe_access();
phh@568:     }
phh@568: 
phh@568:     if (thread->thread_state() == _thread_in_Java) {
phh@568:       do {
phh@568:         // Java thread running in Java code => find exception handler if any
phh@568:         // a fault inside compiled code, the interpreter, or a stub
phh@568: 
phh@568:         if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) {
phh@568:           break;
phh@568:         }
phh@568: 
phh@568:         if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) {
phh@568:           break;
phh@568:         }
phh@568: 
phh@568:         if ((sig == SIGSEGV || sig == SIGBUS) &&
phh@568:             checkVerifyOops(pc, (address)info->si_addr, &stub)) {
phh@568:           break;
phh@568:         }
phh@568: 
phh@568:         if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) {
phh@568:           break;
phh@568:         }
phh@568: 
phh@568:         if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) {
phh@568:           break;
phh@568:         }
phh@568: 
phh@568:         if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) {
phh@568:           break;
phh@568:         }
phh@568: 
phh@568:         if ((sig == SIGSEGV) &&
phh@568:             checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) {
phh@568:           break;
phh@568:         }
phh@568:       } while (0);
phh@568: 
phh@568:       // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
phh@568:       // and the heap gets shrunk before the field access.
phh@568:       if ((sig == SIGSEGV) || (sig == SIGBUS)) {
phh@568:         checkFastJNIAccess(pc, &stub);
phh@568:       }
phh@568:     }
phh@568: 
phh@568:     if (stub != NULL) {
phh@568:       // save all thread context in case we need to restore it
phh@568:       thread->set_saved_exception_pc(pc);
phh@568:       thread->set_saved_exception_npc(npc);
phh@568:       set_cont_address(uc, stub);
phh@568:       return true;
phh@568:     }
phh@568:   }
phh@568: 
phh@568:   // signal-chaining
phh@568:   if (os::Linux::chained_handler(sig, info, ucVoid)) {
phh@568:     return true;
phh@568:   }
phh@568: 
phh@568:   if (!abort_if_unrecognized) {
phh@568:     // caller wants another chance, so give it to him
phh@568:     return false;
phh@568:   }
phh@568: 
phh@568:   if (pc == NULL && uc != NULL) {
phh@568:     pc = os::Linux::ucontext_get_pc((ucontext_t*)uc);
phh@568:   }
phh@568: 
phh@568:   // unmask current signal
phh@568:   sigset_t newset;
phh@568:   sigemptyset(&newset);
phh@568:   sigaddset(&newset, sig);
phh@568:   sigprocmask(SIG_UNBLOCK, &newset, NULL);
phh@568: 
phh@568:   VMError err(t, sig, pc, info, ucVoid);
phh@568:   err.report_and_die();
phh@568: 
phh@568:   ShouldNotReachHere();
phh@568: }
phh@568: 
phh@568: void os::Linux::init_thread_fpu_state(void) {
phh@568:   // Nothing to do
phh@568: }
phh@568: 
phh@568: int os::Linux::get_fpu_control_word() {
phh@568:   return 0;
phh@568: }
phh@568: 
phh@568: void os::Linux::set_fpu_control_word(int fpu) {
phh@568:   // nothing
phh@568: }
phh@568: 
phh@568: bool os::is_allocatable(size_t bytes) {
phh@568: #ifdef _LP64
phh@568:   return true;
phh@568: #else
phh@568:   if (bytes < 2 * G) {
phh@568:     return true;
phh@568:   }
phh@568: 
phh@568:   char* addr = reserve_memory(bytes, NULL);
phh@568: 
phh@568:   if (addr != NULL) {
phh@568:     release_memory(addr, bytes);
phh@568:   }
phh@568: 
phh@568:   return addr != NULL;
phh@568: #endif // _LP64
phh@568: }
phh@568: 
phh@568: ///////////////////////////////////////////////////////////////////////////////
phh@568: // thread stack
phh@568: 
phh@568: size_t os::Linux::min_stack_allowed  = 128 * K;
phh@568: 
phh@568: // pthread on Ubuntu is always in floating stack mode
phh@568: bool os::Linux::supports_variable_stack_size() {  return true; }
phh@568: 
phh@568: // return default stack size for thr_type
phh@568: size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
phh@568:   // default stack size (compiler thread needs larger stack)
phh@568:   size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
phh@568:   return s;
phh@568: }
phh@568: 
phh@568: size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
phh@568:   // Creating guard page is very expensive. Java thread has HotSpot
phh@568:   // guard page, only enable glibc guard page for non-Java threads.
phh@568:   return (thr_type == java_thread ? 0 : page_size());
phh@568: }
roland@3606: 
roland@3606: #ifndef PRODUCT
roland@3606: void os::verify_stack_alignment() {
roland@3606: }
roland@3606: #endif