Mercurial > hg > graal-compiler
diff src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp @ 3960:f08d439fab8c
7089790: integrate bsd-port changes
Reviewed-by: kvn, twisti, jrose
Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>
author | never |
---|---|
date | Sun, 25 Sep 2011 16:03:29 -0700 |
parents | |
children | 436b4a3231bf |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp Sun Sep 25 16:03:29 2011 -0700 @@ -0,0 +1,1124 @@ +/* + * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +// no precompiled headers +#include "assembler_x86.inline.hpp" +#include "classfile/classLoader.hpp" +#include "classfile/systemDictionary.hpp" +#include "classfile/vmSymbols.hpp" +#include "code/icBuffer.hpp" +#include "code/vtableStubs.hpp" +#include "interpreter/interpreter.hpp" +#include "jvm_bsd.h" +#include "memory/allocation.inline.hpp" +#include "mutex_bsd.inline.hpp" +#include "nativeInst_x86.hpp" +#include "os_share_bsd.hpp" +#include "prims/jniFastGetField.hpp" +#include "prims/jvm.h" +#include "prims/jvm_misc.hpp" +#include "runtime/arguments.hpp" +#include "runtime/extendedPC.hpp" +#include "runtime/frame.inline.hpp" +#include "runtime/interfaceSupport.hpp" +#include "runtime/java.hpp" +#include "runtime/javaCalls.hpp" +#include "runtime/mutexLocker.hpp" +#include "runtime/osThread.hpp" +#include "runtime/sharedRuntime.hpp" +#include "runtime/stubRoutines.hpp" +#include "runtime/timer.hpp" +#include "thread_bsd.inline.hpp" +#include "utilities/events.hpp" +#include "utilities/vmError.hpp" +#ifdef COMPILER1 +#include "c1/c1_Runtime1.hpp" +#endif +#ifdef COMPILER2 +#include "opto/runtime.hpp" +#endif + +// put OS-includes here +# include <sys/types.h> +# include <sys/mman.h> +# include <pthread.h> +# include <signal.h> +# include <errno.h> +# include <dlfcn.h> +# include <stdlib.h> +# include <stdio.h> +# include <unistd.h> +# include <sys/resource.h> +# include <pthread.h> +# include <sys/stat.h> +# include <sys/time.h> +# include <sys/utsname.h> +# include <sys/socket.h> +# include <sys/wait.h> +# include <pwd.h> +# include <poll.h> +#ifndef __OpenBSD__ +# include <ucontext.h> +#endif + +#if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) && !defined(__NetBSD__) +# include <pthread_np.h> +#endif + +#ifdef AMD64 +#define SPELL_REG_SP "rsp" +#define SPELL_REG_FP "rbp" +#else +#define SPELL_REG_SP "esp" +#define SPELL_REG_FP "ebp" +#endif // AMD64 + +#ifdef __FreeBSD__ +# define context_trapno uc_mcontext.mc_trapno +# ifdef AMD64 +# define context_pc uc_mcontext.mc_rip +# define context_sp uc_mcontext.mc_rsp +# define context_fp uc_mcontext.mc_rbp +# define context_rip uc_mcontext.mc_rip +# define context_rsp uc_mcontext.mc_rsp +# define context_rbp uc_mcontext.mc_rbp +# define context_rax uc_mcontext.mc_rax +# define context_rbx uc_mcontext.mc_rbx +# define context_rcx uc_mcontext.mc_rcx +# define context_rdx uc_mcontext.mc_rdx +# define context_rsi uc_mcontext.mc_rsi +# define context_rdi uc_mcontext.mc_rdi +# define context_r8 uc_mcontext.mc_r8 +# define context_r9 uc_mcontext.mc_r9 +# define context_r10 uc_mcontext.mc_r10 +# define context_r11 uc_mcontext.mc_r11 +# define context_r12 uc_mcontext.mc_r12 +# define context_r13 uc_mcontext.mc_r13 +# define context_r14 uc_mcontext.mc_r14 +# define context_r15 uc_mcontext.mc_r15 +# define context_flags uc_mcontext.mc_flags +# define context_err uc_mcontext.mc_err +# else +# define context_pc uc_mcontext.mc_eip +# define context_sp uc_mcontext.mc_esp +# define context_fp uc_mcontext.mc_ebp +# define context_eip uc_mcontext.mc_eip +# define context_esp uc_mcontext.mc_esp +# define context_eax uc_mcontext.mc_eax +# define context_ebx uc_mcontext.mc_ebx +# define context_ecx uc_mcontext.mc_ecx +# define context_edx uc_mcontext.mc_edx +# define context_ebp uc_mcontext.mc_ebp +# define context_esi uc_mcontext.mc_esi +# define context_edi uc_mcontext.mc_edi +# define context_eflags uc_mcontext.mc_eflags +# define context_trapno uc_mcontext.mc_trapno +# endif +#endif + +#ifdef __APPLE__ +# if __DARWIN_UNIX03 && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5) + // 10.5 UNIX03 member name prefixes + #define DU3_PREFIX(s, m) __ ## s.__ ## m +# else + #define DU3_PREFIX(s, m) s ## . ## m +# endif + +# ifdef AMD64 +# define context_pc context_rip +# define context_sp context_rsp +# define context_fp context_rbp +# define context_rip uc_mcontext->DU3_PREFIX(ss,rip) +# define context_rsp uc_mcontext->DU3_PREFIX(ss,rsp) +# define context_rax uc_mcontext->DU3_PREFIX(ss,rax) +# define context_rbx uc_mcontext->DU3_PREFIX(ss,rbx) +# define context_rcx uc_mcontext->DU3_PREFIX(ss,rcx) +# define context_rdx uc_mcontext->DU3_PREFIX(ss,rdx) +# define context_rbp uc_mcontext->DU3_PREFIX(ss,rbp) +# define context_rsi uc_mcontext->DU3_PREFIX(ss,rsi) +# define context_rdi uc_mcontext->DU3_PREFIX(ss,rdi) +# define context_r8 uc_mcontext->DU3_PREFIX(ss,r8) +# define context_r9 uc_mcontext->DU3_PREFIX(ss,r9) +# define context_r10 uc_mcontext->DU3_PREFIX(ss,r10) +# define context_r11 uc_mcontext->DU3_PREFIX(ss,r11) +# define context_r12 uc_mcontext->DU3_PREFIX(ss,r12) +# define context_r13 uc_mcontext->DU3_PREFIX(ss,r13) +# define context_r14 uc_mcontext->DU3_PREFIX(ss,r14) +# define context_r15 uc_mcontext->DU3_PREFIX(ss,r15) +# define context_flags uc_mcontext->DU3_PREFIX(ss,rflags) +# define context_trapno uc_mcontext->DU3_PREFIX(es,trapno) +# define context_err uc_mcontext->DU3_PREFIX(es,err) +# else +# define context_pc context_eip +# define context_sp context_esp +# define context_fp context_ebp +# define context_eip uc_mcontext->DU3_PREFIX(ss,eip) +# define context_esp uc_mcontext->DU3_PREFIX(ss,esp) +# define context_eax uc_mcontext->DU3_PREFIX(ss,eax) +# define context_ebx uc_mcontext->DU3_PREFIX(ss,ebx) +# define context_ecx uc_mcontext->DU3_PREFIX(ss,ecx) +# define context_edx uc_mcontext->DU3_PREFIX(ss,edx) +# define context_ebp uc_mcontext->DU3_PREFIX(ss,ebp) +# define context_esi uc_mcontext->DU3_PREFIX(ss,esi) +# define context_edi uc_mcontext->DU3_PREFIX(ss,edi) +# define context_eflags uc_mcontext->DU3_PREFIX(ss,eflags) +# define context_trapno uc_mcontext->DU3_PREFIX(es,trapno) +# endif +#endif + +#ifdef __OpenBSD__ +# define context_trapno sc_trapno +# ifdef AMD64 +# define context_pc sc_rip +# define context_sp sc_rsp +# define context_fp sc_rbp +# define context_rip sc_rip +# define context_rsp sc_rsp +# define context_rbp sc_rbp +# define context_rax sc_rax +# define context_rbx sc_rbx +# define context_rcx sc_rcx +# define context_rdx sc_rdx +# define context_rsi sc_rsi +# define context_rdi sc_rdi +# define context_r8 sc_r8 +# define context_r9 sc_r9 +# define context_r10 sc_r10 +# define context_r11 sc_r11 +# define context_r12 sc_r12 +# define context_r13 sc_r13 +# define context_r14 sc_r14 +# define context_r15 sc_r15 +# define context_flags sc_rflags +# define context_err sc_err +# else +# define context_pc sc_eip +# define context_sp sc_esp +# define context_fp sc_ebp +# define context_eip sc_eip +# define context_esp sc_esp +# define context_eax sc_eax +# define context_ebx sc_ebx +# define context_ecx sc_ecx +# define context_edx sc_edx +# define context_ebp sc_ebp +# define context_esi sc_esi +# define context_edi sc_edi +# define context_eflags sc_eflags +# define context_trapno sc_trapno +# endif +#endif + +#ifdef __NetBSD__ +# define context_trapno uc_mcontext.__gregs[_REG_TRAPNO] +# ifdef AMD64 +# define __register_t __greg_t +# define context_pc uc_mcontext.__gregs[_REG_RIP] +# define context_sp uc_mcontext.__gregs[_REG_URSP] +# define context_fp uc_mcontext.__gregs[_REG_RBP] +# define context_rip uc_mcontext.__gregs[_REG_RIP] +# define context_rsp uc_mcontext.__gregs[_REG_URSP] +# define context_rax uc_mcontext.__gregs[_REG_RAX] +# define context_rbx uc_mcontext.__gregs[_REG_RBX] +# define context_rcx uc_mcontext.__gregs[_REG_RCX] +# define context_rdx uc_mcontext.__gregs[_REG_RDX] +# define context_rbp uc_mcontext.__gregs[_REG_RBP] +# define context_rsi uc_mcontext.__gregs[_REG_RSI] +# define context_rdi uc_mcontext.__gregs[_REG_RDI] +# define context_r8 uc_mcontext.__gregs[_REG_R8] +# define context_r9 uc_mcontext.__gregs[_REG_R9] +# define context_r10 uc_mcontext.__gregs[_REG_R10] +# define context_r11 uc_mcontext.__gregs[_REG_R11] +# define context_r12 uc_mcontext.__gregs[_REG_R12] +# define context_r13 uc_mcontext.__gregs[_REG_R13] +# define context_r14 uc_mcontext.__gregs[_REG_R14] +# define context_r15 uc_mcontext.__gregs[_REG_R15] +# define context_flags uc_mcontext.__gregs[_REG_RFL] +# define context_err uc_mcontext.__gregs[_REG_ERR] +# else +# define context_pc uc_mcontext.__gregs[_REG_EIP] +# define context_sp uc_mcontext.__gregs[_REG_UESP] +# define context_fp uc_mcontext.__gregs[_REG_EBP] +# define context_eip uc_mcontext.__gregs[_REG_EIP] +# define context_esp uc_mcontext.__gregs[_REG_UESP] +# define context_eax uc_mcontext.__gregs[_REG_EAX] +# define context_ebx uc_mcontext.__gregs[_REG_EBX] +# define context_ecx uc_mcontext.__gregs[_REG_ECX] +# define context_edx uc_mcontext.__gregs[_REG_EDX] +# define context_ebp uc_mcontext.__gregs[_REG_EBP] +# define context_esi uc_mcontext.__gregs[_REG_ESI] +# define context_edi uc_mcontext.__gregs[_REG_EDI] +# define context_eflags uc_mcontext.__gregs[_REG_EFL] +# define context_trapno uc_mcontext.__gregs[_REG_TRAPNO] +# endif +#endif + +address os::current_stack_pointer() { +#ifdef SPARC_WORKS + register void *esp; + __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp)); + return (address) ((char*)esp + sizeof(long)*2); +#else + register void *esp __asm__ (SPELL_REG_SP); + return (address) esp; +#endif +} + +char* os::non_memory_address_word() { + // Must never look like an address returned by reserve_memory, + // even in its subfields (as defined by the CPU immediate fields, + // if the CPU splits constants across multiple instructions). + + return (char*) -1; +} + +void os::initialize_thread() { +// Nothing to do. +} + +address os::Bsd::ucontext_get_pc(ucontext_t * uc) { + return (address)uc->context_pc; +} + +intptr_t* os::Bsd::ucontext_get_sp(ucontext_t * uc) { + return (intptr_t*)uc->context_sp; +} + +intptr_t* os::Bsd::ucontext_get_fp(ucontext_t * uc) { + return (intptr_t*)uc->context_fp; +} + +// For Forte Analyzer AsyncGetCallTrace profiling support - thread +// is currently interrupted by SIGPROF. +// os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal +// frames. Currently we don't do that on Bsd, so it's the same as +// os::fetch_frame_from_context(). +ExtendedPC os::Bsd::fetch_frame_from_ucontext(Thread* thread, + ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { + + assert(thread != NULL, "just checking"); + assert(ret_sp != NULL, "just checking"); + assert(ret_fp != NULL, "just checking"); + + return os::fetch_frame_from_context(uc, ret_sp, ret_fp); +} + +ExtendedPC os::fetch_frame_from_context(void* ucVoid, + intptr_t** ret_sp, intptr_t** ret_fp) { + + ExtendedPC epc; + ucontext_t* uc = (ucontext_t*)ucVoid; + + if (uc != NULL) { + epc = ExtendedPC(os::Bsd::ucontext_get_pc(uc)); + if (ret_sp) *ret_sp = os::Bsd::ucontext_get_sp(uc); + if (ret_fp) *ret_fp = os::Bsd::ucontext_get_fp(uc); + } else { + // construct empty ExtendedPC for return value checking + epc = ExtendedPC(NULL); + if (ret_sp) *ret_sp = (intptr_t *)NULL; + if (ret_fp) *ret_fp = (intptr_t *)NULL; + } + + return epc; +} + +frame os::fetch_frame_from_context(void* ucVoid) { + intptr_t* sp; + intptr_t* fp; + ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); + return frame(sp, fp, epc.pc()); +} + +// By default, gcc always save frame pointer (%ebp/%rbp) on stack. It may get +// turned off by -fomit-frame-pointer, +frame os::get_sender_for_C_frame(frame* fr) { + return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); +} + +intptr_t* _get_previous_fp() { +#ifdef SPARC_WORKS + register intptr_t **ebp; + __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp)); +#else + register intptr_t **ebp __asm__ (SPELL_REG_FP); +#endif + return (intptr_t*) *ebp; // we want what it points to. +} + + +frame os::current_frame() { + intptr_t* fp = _get_previous_fp(); + frame myframe((intptr_t*)os::current_stack_pointer(), + (intptr_t*)fp, + CAST_FROM_FN_PTR(address, os::current_frame)); + if (os::is_first_C_frame(&myframe)) { + // stack is not walkable + return frame(NULL, NULL, NULL); + } else { + return os::get_sender_for_C_frame(&myframe); + } +} + +// Utility functions + +// From IA32 System Programming Guide +enum { + trap_page_fault = 0xE +}; + +extern "C" void Fetch32PFI () ; +extern "C" void Fetch32Resume () ; +#ifdef AMD64 +extern "C" void FetchNPFI () ; +extern "C" void FetchNResume () ; +#endif // AMD64 + +extern "C" JNIEXPORT int +JVM_handle_bsd_signal(int sig, + siginfo_t* info, + void* ucVoid, + int abort_if_unrecognized) { + ucontext_t* uc = (ucontext_t*) ucVoid; + + Thread* t = ThreadLocalStorage::get_thread_slow(); + + SignalHandlerMark shm(t); + + // Note: it's not uncommon that JNI code uses signal/sigset to install + // then restore certain signal handler (e.g. to temporarily block SIGPIPE, + // or have a SIGILL handler when detecting CPU type). When that happens, + // JVM_handle_bsd_signal() might be invoked with junk info/ucVoid. To + // avoid unnecessary crash when libjsig is not preloaded, try handle signals + // that do not require siginfo/ucontext first. + + if (sig == SIGPIPE || sig == SIGXFSZ) { + // allow chained handler to go first + if (os::Bsd::chained_handler(sig, info, ucVoid)) { + return true; + } else { + if (PrintMiscellaneous && (WizardMode || Verbose)) { + char buf[64]; + warning("Ignoring %s - see bugs 4229104 or 646499219", + os::exception_name(sig, buf, sizeof(buf))); + } + return true; + } + } + + JavaThread* thread = NULL; + VMThread* vmthread = NULL; + if (os::Bsd::signal_handlers_are_installed) { + if (t != NULL ){ + if(t->is_Java_thread()) { + thread = (JavaThread*)t; + } + else if(t->is_VM_thread()){ + vmthread = (VMThread *)t; + } + } + } +/* + NOTE: does not seem to work on bsd. + if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { + // can't decode this kind of signal + info = NULL; + } else { + assert(sig == info->si_signo, "bad siginfo"); + } +*/ + // decide if this trap can be handled by a stub + address stub = NULL; + + address pc = NULL; + + //%note os_trap_1 + if (info != NULL && uc != NULL && thread != NULL) { + pc = (address) os::Bsd::ucontext_get_pc(uc); + + if (pc == (address) Fetch32PFI) { + uc->context_pc = intptr_t(Fetch32Resume) ; + return 1 ; + } +#ifdef AMD64 + if (pc == (address) FetchNPFI) { + uc->context_pc = intptr_t (FetchNResume) ; + return 1 ; + } +#endif // AMD64 + + // Handle ALL stack overflow variations here + if (sig == SIGSEGV || sig == SIGBUS) { + address addr = (address) info->si_addr; + + // check if fault address is within thread stack + if (addr < thread->stack_base() && + addr >= thread->stack_base() - thread->stack_size()) { + // stack overflow + if (thread->in_stack_yellow_zone(addr)) { + thread->disable_stack_yellow_zone(); + if (thread->thread_state() == _thread_in_Java) { + // Throw a stack overflow exception. Guard pages will be reenabled + // while unwinding the stack. + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); + } else { + // Thread was in the vm or native code. Return and try to finish. + return 1; + } + } else if (thread->in_stack_red_zone(addr)) { + // Fatal red zone violation. Disable the guard pages and fall through + // to handle_unexpected_exception way down below. + thread->disable_stack_red_zone(); + tty->print_raw_cr("An irrecoverable stack overflow has occurred."); +#ifndef _ALLBSD_SOURCE + } else { + // Accessing stack address below sp may cause SEGV if current + // thread has MAP_GROWSDOWN stack. This should only happen when + // current thread was created by user code with MAP_GROWSDOWN flag + // and then attached to VM. See notes in os_bsd.cpp. + if (thread->osthread()->expanding_stack() == 0) { + thread->osthread()->set_expanding_stack(); + if (os::Bsd::manually_expand_stack(thread, addr)) { + thread->osthread()->clear_expanding_stack(); + return 1; + } + thread->osthread()->clear_expanding_stack(); + } else { + fatal("recursive segv. expanding stack."); + } +#endif + } + } + } + + if (thread->thread_state() == _thread_in_Java) { + // Java thread running in Java code => find exception handler if any + // a fault inside compiled code, the interpreter, or a stub + + if ((sig == SIGSEGV || sig == SIGBUS) && os::is_poll_address((address)info->si_addr)) { + stub = SharedRuntime::get_poll_stub(pc); +#if defined(__APPLE__) && !defined(AMD64) + // 32-bit Darwin reports a SIGBUS for nearly all memory access exceptions. + // Catching SIGBUS here prevents the implicit SIGBUS NULL check below from + // being called, so only do so if the implicit NULL check is not necessary. + } else if (sig == SIGBUS && MacroAssembler::needs_explicit_null_check((int)info->si_addr)) { +#else + } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { +#endif + // BugId 4454115: A read from a MappedByteBuffer can fault + // here if the underlying file has been truncated. + // Do not crash the VM in such a case. + CodeBlob* cb = CodeCache::find_blob_unsafe(pc); + nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; + if (nm != NULL && nm->has_unsafe_access()) { + stub = StubRoutines::handler_for_unsafe_access(); + } + } + else + +#ifdef AMD64 + if (sig == SIGFPE && + (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { + stub = + SharedRuntime:: + continuation_for_implicit_exception(thread, + pc, + SharedRuntime:: + IMPLICIT_DIVIDE_BY_ZERO); +#ifdef __APPLE__ + } else if (sig == SIGFPE && info->si_code == FPE_NOOP) { + int op = pc[0]; + + // Skip REX + if ((pc[0] & 0xf0) == 0x40) { + op = pc[1]; + } else { + op = pc[0]; + } + + // Check for IDIV + if (op == 0xF7) { + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime:: IMPLICIT_DIVIDE_BY_ZERO); + } else { + // TODO: handle more cases if we are using other x86 instructions + // that can generate SIGFPE signal. + tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); + fatal("please update this code."); + } +#endif /* __APPLE__ */ + +#else + if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { + // HACK: si_code does not work on bsd 2.2.12-20!!! + int op = pc[0]; + if (op == 0xDB) { + // FIST + // TODO: The encoding of D2I in i486.ad can cause an exception + // prior to the fist instruction if there was an invalid operation + // pending. We want to dismiss that exception. From the win_32 + // side it also seems that if it really was the fist causing + // the exception that we do the d2i by hand with different + // rounding. Seems kind of weird. + // NOTE: that we take the exception at the NEXT floating point instruction. + assert(pc[0] == 0xDB, "not a FIST opcode"); + assert(pc[1] == 0x14, "not a FIST opcode"); + assert(pc[2] == 0x24, "not a FIST opcode"); + return true; + } else if (op == 0xF7) { + // IDIV + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); + } else { + // TODO: handle more cases if we are using other x86 instructions + // that can generate SIGFPE signal on bsd. + tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); + fatal("please update this code."); + } +#endif // AMD64 + } else if ((sig == SIGSEGV || sig == SIGBUS) && + !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { + // Determination of interpreter/vtable stub/compiled code null exception + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); + } + } else if (thread->thread_state() == _thread_in_vm && + sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ + thread->doing_unsafe_access()) { + stub = StubRoutines::handler_for_unsafe_access(); + } + + // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in + // and the heap gets shrunk before the field access. + if ((sig == SIGSEGV) || (sig == SIGBUS)) { + address addr = JNI_FastGetField::find_slowcase_pc(pc); + if (addr != (address)-1) { + stub = addr; + } + } + + // Check to see if we caught the safepoint code in the + // process of write protecting the memory serialization page. + // It write enables the page immediately after protecting it + // so we can just return to retry the write. + if ((sig == SIGSEGV || sig == SIGBUS) && + os::is_memory_serialize_page(thread, (address) info->si_addr)) { + // Block current thread until the memory serialize page permission restored. + os::block_on_serialize_page_trap(); + return true; + } + } + +#ifndef AMD64 + // Execution protection violation + // + // This should be kept as the last step in the triage. We don't + // have a dedicated trap number for a no-execute fault, so be + // conservative and allow other handlers the first shot. + // + // Note: We don't test that info->si_code == SEGV_ACCERR here. + // this si_code is so generic that it is almost meaningless; and + // the si_code for this condition may change in the future. + // Furthermore, a false-positive should be harmless. + if (UnguardOnExecutionViolation > 0 && + (sig == SIGSEGV || sig == SIGBUS) && + uc->context_trapno == trap_page_fault) { + int page_size = os::vm_page_size(); + address addr = (address) info->si_addr; + address pc = os::Bsd::ucontext_get_pc(uc); + // Make sure the pc and the faulting address are sane. + // + // If an instruction spans a page boundary, and the page containing + // the beginning of the instruction is executable but the following + // page is not, the pc and the faulting address might be slightly + // different - we still want to unguard the 2nd page in this case. + // + // 15 bytes seems to be a (very) safe value for max instruction size. + bool pc_is_near_addr = + (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); + bool instr_spans_page_boundary = + (align_size_down((intptr_t) pc ^ (intptr_t) addr, + (intptr_t) page_size) > 0); + + if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { + static volatile address last_addr = + (address) os::non_memory_address_word(); + + // In conservative mode, don't unguard unless the address is in the VM + if (addr != last_addr && + (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { + + // Set memory to RWX and retry + address page_start = + (address) align_size_down((intptr_t) addr, (intptr_t) page_size); + bool res = os::protect_memory((char*) page_start, page_size, + os::MEM_PROT_RWX); + + if (PrintMiscellaneous && Verbose) { + char buf[256]; + jio_snprintf(buf, sizeof(buf), "Execution protection violation " + "at " INTPTR_FORMAT + ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, + page_start, (res ? "success" : "failed"), errno); + tty->print_raw_cr(buf); + } + stub = pc; + + // Set last_addr so if we fault again at the same address, we don't end + // up in an endless loop. + // + // There are two potential complications here. Two threads trapping at + // the same address at the same time could cause one of the threads to + // think it already unguarded, and abort the VM. Likely very rare. + // + // The other race involves two threads alternately trapping at + // different addresses and failing to unguard the page, resulting in + // an endless loop. This condition is probably even more unlikely than + // the first. + // + // Although both cases could be avoided by using locks or thread local + // last_addr, these solutions are unnecessary complication: this + // handler is a best-effort safety net, not a complete solution. It is + // disabled by default and should only be used as a workaround in case + // we missed any no-execute-unsafe VM code. + + last_addr = addr; + } + } + } +#endif // !AMD64 + + if (stub != NULL) { + // save all thread context in case we need to restore it + if (thread != NULL) thread->set_saved_exception_pc(pc); + + uc->context_pc = (intptr_t)stub; + return true; + } + + // signal-chaining + if (os::Bsd::chained_handler(sig, info, ucVoid)) { + return true; + } + + if (!abort_if_unrecognized) { + // caller wants another chance, so give it to him + return false; + } + + if (pc == NULL && uc != NULL) { + pc = os::Bsd::ucontext_get_pc(uc); + } + + // unmask current signal + sigset_t newset; + sigemptyset(&newset); + sigaddset(&newset, sig); + sigprocmask(SIG_UNBLOCK, &newset, NULL); + + VMError err(t, sig, pc, info, ucVoid); + err.report_and_die(); + + ShouldNotReachHere(); +} + +#ifdef _ALLBSD_SOURCE +// From solaris_i486.s ported to bsd_i486.s +extern "C" void fixcw(); +#endif + +void os::Bsd::init_thread_fpu_state(void) { +#ifndef AMD64 +# ifdef _ALLBSD_SOURCE + // Set fpu to 53 bit precision. This happens too early to use a stub. + fixcw(); +# else + // set fpu to 53 bit precision + set_fpu_control_word(0x27f); +# endif +#endif // !AMD64 +} + +#ifndef _ALLBSD_SOURCE +int os::Bsd::get_fpu_control_word(void) { +#ifdef AMD64 + return 0; +#else + int fpu_control; + _FPU_GETCW(fpu_control); + return fpu_control & 0xffff; +#endif // AMD64 +} + +void os::Bsd::set_fpu_control_word(int fpu_control) { +#ifndef AMD64 + _FPU_SETCW(fpu_control); +#endif // !AMD64 +} +#endif + +// Check that the bsd kernel version is 2.4 or higher since earlier +// versions do not support SSE without patches. +bool os::supports_sse() { +#if defined(AMD64) || defined(_ALLBSD_SOURCE) + return true; +#else + struct utsname uts; + if( uname(&uts) != 0 ) return false; // uname fails? + char *minor_string; + int major = strtol(uts.release,&minor_string,10); + int minor = strtol(minor_string+1,NULL,10); + bool result = (major > 2 || (major==2 && minor >= 4)); +#ifndef PRODUCT + if (PrintMiscellaneous && Verbose) { + tty->print("OS version is %d.%d, which %s support SSE/SSE2\n", + major,minor, result ? "DOES" : "does NOT"); + } +#endif + return result; +#endif // AMD64 +} + +bool os::is_allocatable(size_t bytes) { +#ifdef AMD64 + // unused on amd64? + return true; +#else + + if (bytes < 2 * G) { + return true; + } + + char* addr = reserve_memory(bytes, NULL); + + if (addr != NULL) { + release_memory(addr, bytes); + } + + return addr != NULL; +#endif // AMD64 +} + +//////////////////////////////////////////////////////////////////////////////// +// thread stack + +#ifdef AMD64 +size_t os::Bsd::min_stack_allowed = 64 * K; + +// amd64: pthread on amd64 is always in floating stack mode +bool os::Bsd::supports_variable_stack_size() { return true; } +#else +size_t os::Bsd::min_stack_allowed = (48 DEBUG_ONLY(+4))*K; + +#ifdef __GNUC__ +#define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;}) +#endif + +#ifdef _ALLBSD_SOURCE +bool os::Bsd::supports_variable_stack_size() { return true; } +#else +// Test if pthread library can support variable thread stack size. BsdThreads +// in fixed stack mode allocates 2M fixed slot for each thread. BsdThreads +// in floating stack mode and NPTL support variable stack size. +bool os::Bsd::supports_variable_stack_size() { + if (os::Bsd::is_NPTL()) { + // NPTL, yes + return true; + + } else { + // Note: We can't control default stack size when creating a thread. + // If we use non-default stack size (pthread_attr_setstacksize), both + // floating stack and non-floating stack BsdThreads will return the + // same value. This makes it impossible to implement this function by + // detecting thread stack size directly. + // + // An alternative approach is to check %gs. Fixed-stack BsdThreads + // do not use %gs, so its value is 0. Floating-stack BsdThreads use + // %gs (either as LDT selector or GDT selector, depending on kernel) + // to access thread specific data. + // + // Note that %gs is a reserved glibc register since early 2001, so + // applications are not allowed to change its value (Ulrich Drepper from + // Redhat confirmed that all known offenders have been modified to use + // either %fs or TSD). In the worst case scenario, when VM is embedded in + // a native application that plays with %gs, we might see non-zero %gs + // even BsdThreads is running in fixed stack mode. As the result, we'll + // return true and skip _thread_safety_check(), so we may not be able to + // detect stack-heap collisions. But otherwise it's harmless. + // +#ifdef __GNUC__ + return (GET_GS() != 0); +#else + return false; +#endif + } +} +#endif +#endif // AMD64 + +// return default stack size for thr_type +size_t os::Bsd::default_stack_size(os::ThreadType thr_type) { + // default stack size (compiler thread needs larger stack) +#ifdef AMD64 + size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); +#else + size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); +#endif // AMD64 + return s; +} + +size_t os::Bsd::default_guard_size(os::ThreadType thr_type) { + // Creating guard page is very expensive. Java thread has HotSpot + // guard page, only enable glibc guard page for non-Java threads. + return (thr_type == java_thread ? 0 : page_size()); +} + +// Java thread: +// +// Low memory addresses +// +------------------------+ +// | |\ JavaThread created by VM does not have glibc +// | glibc guard page | - guard, attached Java thread usually has +// | |/ 1 page glibc guard. +// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() +// | |\ +// | HotSpot Guard Pages | - red and yellow pages +// | |/ +// +------------------------+ JavaThread::stack_yellow_zone_base() +// | |\ +// | Normal Stack | - +// | |/ +// P2 +------------------------+ Thread::stack_base() +// +// Non-Java thread: +// +// Low memory addresses +// +------------------------+ +// | |\ +// | glibc guard page | - usually 1 page +// | |/ +// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() +// | |\ +// | Normal Stack | - +// | |/ +// P2 +------------------------+ Thread::stack_base() +// +// ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from +// pthread_attr_getstack() + +static void current_stack_region(address * bottom, size_t * size) { +#ifdef __APPLE__ + pthread_t self = pthread_self(); + void *stacktop = pthread_get_stackaddr_np(self); + *size = pthread_get_stacksize_np(self); + *bottom = (address) stacktop - *size; +#elif defined(__OpenBSD__) + stack_t ss; + int rslt = pthread_stackseg_np(pthread_self(), &ss); + + if (rslt != 0) + fatal(err_msg("pthread_stackseg_np failed with err = %d", rslt)); + + *bottom = (address)((char *)ss.ss_sp - ss.ss_size); + *size = ss.ss_size; +#elif defined(_ALLBSD_SOURCE) + pthread_attr_t attr; + + int rslt = pthread_attr_init(&attr); + + // JVM needs to know exact stack location, abort if it fails + if (rslt != 0) + fatal(err_msg("pthread_attr_init failed with err = %d", rslt)); + + rslt = pthread_attr_get_np(pthread_self(), &attr); + + if (rslt != 0) + fatal(err_msg("pthread_attr_get_np failed with err = %d", rslt)); + + if (pthread_attr_getstackaddr(&attr, (void **)bottom) != 0 || + pthread_attr_getstacksize(&attr, size) != 0) { + fatal("Can not locate current stack attributes!"); + } + + pthread_attr_destroy(&attr); +#else + if (os::Bsd::is_initial_thread()) { + // initial thread needs special handling because pthread_getattr_np() + // may return bogus value. + *bottom = os::Bsd::initial_thread_stack_bottom(); + *size = os::Bsd::initial_thread_stack_size(); + } else { + pthread_attr_t attr; + + int rslt = pthread_getattr_np(pthread_self(), &attr); + + // JVM needs to know exact stack location, abort if it fails + if (rslt != 0) { + if (rslt == ENOMEM) { + vm_exit_out_of_memory(0, "pthread_getattr_np"); + } else { + fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); + } + } + + if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { + fatal("Can not locate current stack attributes!"); + } + + pthread_attr_destroy(&attr); + + } +#endif + assert(os::current_stack_pointer() >= *bottom && + os::current_stack_pointer() < *bottom + *size, "just checking"); +} + +address os::current_stack_base() { + address bottom; + size_t size; + current_stack_region(&bottom, &size); + return (bottom + size); +} + +size_t os::current_stack_size() { + // stack size includes normal stack and HotSpot guard pages + address bottom; + size_t size; + current_stack_region(&bottom, &size); + return size; +} + +///////////////////////////////////////////////////////////////////////////// +// helper functions for fatal error handler + +void os::print_context(outputStream *st, void *context) { + if (context == NULL) return; + + ucontext_t *uc = (ucontext_t*)context; + st->print_cr("Registers:"); +#ifdef AMD64 + st->print( "RAX=" INTPTR_FORMAT, uc->context_rax); + st->print(", RBX=" INTPTR_FORMAT, uc->context_rbx); + st->print(", RCX=" INTPTR_FORMAT, uc->context_rcx); + st->print(", RDX=" INTPTR_FORMAT, uc->context_rdx); + st->cr(); + st->print( "RSP=" INTPTR_FORMAT, uc->context_rsp); + st->print(", RBP=" INTPTR_FORMAT, uc->context_rbp); + st->print(", RSI=" INTPTR_FORMAT, uc->context_rsi); + st->print(", RDI=" INTPTR_FORMAT, uc->context_rdi); + st->cr(); + st->print( "R8 =" INTPTR_FORMAT, uc->context_r8); + st->print(", R9 =" INTPTR_FORMAT, uc->context_r9); + st->print(", R10=" INTPTR_FORMAT, uc->context_r10); + st->print(", R11=" INTPTR_FORMAT, uc->context_r11); + st->cr(); + st->print( "R12=" INTPTR_FORMAT, uc->context_r12); + st->print(", R13=" INTPTR_FORMAT, uc->context_r13); + st->print(", R14=" INTPTR_FORMAT, uc->context_r14); + st->print(", R15=" INTPTR_FORMAT, uc->context_r15); + st->cr(); + st->print( "RIP=" INTPTR_FORMAT, uc->context_rip); + st->print(", EFLAGS=" INTPTR_FORMAT, uc->context_flags); + st->print(", ERR=" INTPTR_FORMAT, uc->context_err); + st->cr(); + st->print(" TRAPNO=" INTPTR_FORMAT, uc->context_trapno); +#else + st->print( "EAX=" INTPTR_FORMAT, uc->context_eax); + st->print(", EBX=" INTPTR_FORMAT, uc->context_ebx); + st->print(", ECX=" INTPTR_FORMAT, uc->context_ecx); + st->print(", EDX=" INTPTR_FORMAT, uc->context_edx); + st->cr(); + st->print( "ESP=" INTPTR_FORMAT, uc->context_esp); + st->print(", EBP=" INTPTR_FORMAT, uc->context_ebp); + st->print(", ESI=" INTPTR_FORMAT, uc->context_esi); + st->print(", EDI=" INTPTR_FORMAT, uc->context_edi); + st->cr(); + st->print( "EIP=" INTPTR_FORMAT, uc->context_eip); + st->print(", EFLAGS=" INTPTR_FORMAT, uc->context_eflags); +#endif // AMD64 + st->cr(); + st->cr(); + + intptr_t *sp = (intptr_t *)os::Bsd::ucontext_get_sp(uc); + st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); + print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); + st->cr(); + + // Note: it may be unsafe to inspect memory near pc. For example, pc may + // point to garbage if entry point in an nmethod is corrupted. Leave + // this at the end, and hope for the best. + address pc = os::Bsd::ucontext_get_pc(uc); + st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); + print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); +} + +void os::print_register_info(outputStream *st, void *context) { + if (context == NULL) return; + + ucontext_t *uc = (ucontext_t*)context; + + st->print_cr("Register to memory mapping:"); + st->cr(); + + // this is horrendously verbose but the layout of the registers in the + // context does not match how we defined our abstract Register set, so + // we can't just iterate through the gregs area + + // this is only for the "general purpose" registers + +#ifdef AMD64 + st->print("RAX="); print_location(st, uc->context_rax); + st->print("RBX="); print_location(st, uc->context_rbx); + st->print("RCX="); print_location(st, uc->context_rcx); + st->print("RDX="); print_location(st, uc->context_rdx); + st->print("RSP="); print_location(st, uc->context_rsp); + st->print("RBP="); print_location(st, uc->context_rbp); + st->print("RSI="); print_location(st, uc->context_rsi); + st->print("RDI="); print_location(st, uc->context_rdi); + st->print("R8 ="); print_location(st, uc->context_r8); + st->print("R9 ="); print_location(st, uc->context_r9); + st->print("R10="); print_location(st, uc->context_r10); + st->print("R11="); print_location(st, uc->context_r11); + st->print("R12="); print_location(st, uc->context_r12); + st->print("R13="); print_location(st, uc->context_r13); + st->print("R14="); print_location(st, uc->context_r14); + st->print("R15="); print_location(st, uc->context_r15); +#else + st->print("EAX="); print_location(st, uc->context_eax); + st->print("EBX="); print_location(st, uc->context_ebx); + st->print("ECX="); print_location(st, uc->context_ecx); + st->print("EDX="); print_location(st, uc->context_edx); + st->print("ESP="); print_location(st, uc->context_esp); + st->print("EBP="); print_location(st, uc->context_ebp); + st->print("ESI="); print_location(st, uc->context_esi); + st->print("EDI="); print_location(st, uc->context_edi); +#endif // AMD64 + + st->cr(); +} + +void os::setup_fpu() { +#ifndef AMD64 + address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); + __asm__ volatile ( "fldcw (%0)" : + : "r" (fpu_cntrl) : "memory"); +#endif // !AMD64 +}