author | coleenp |
Fri, 16 Mar 2018 09:12:13 -0400 | |
changeset 49449 | ef5d5d343e2a |
parent 48468 | 7cc7de9bf4a4 |
child 49653 | a569cb4425f3 |
permissions | -rw-r--r-- |
42664 | 1 |
/* |
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8166651: OrderAccess::load_acquire &etc should have const parameters
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changeset
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* Copyright (c) 2008, 2017, Oracle and/or its affiliates. All rights reserved. |
42664 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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// no precompiled headers |
|
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8189610: Reconcile jvm.h and all jvm_md.h between java.base and hotspot
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#include "jvm.h" |
42664 | 27 |
#include "assembler_arm.inline.hpp" |
28 |
#include "classfile/classLoader.hpp" |
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29 |
#include "classfile/systemDictionary.hpp" |
|
30 |
#include "classfile/vmSymbols.hpp" |
|
31 |
#include "code/icBuffer.hpp" |
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32 |
#include "code/vtableStubs.hpp" |
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#include "interpreter/interpreter.hpp" |
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34 |
#include "memory/allocation.inline.hpp" |
|
35 |
#include "nativeInst_arm.hpp" |
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#include "os_share_linux.hpp" |
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#include "prims/jniFastGetField.hpp" |
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38 |
#include "prims/jvm_misc.hpp" |
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39 |
#include "runtime/arguments.hpp" |
|
40 |
#include "runtime/extendedPC.hpp" |
|
41 |
#include "runtime/frame.inline.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
42664 | 43 |
#include "runtime/java.hpp" |
44 |
#include "runtime/javaCalls.hpp" |
|
45 |
#include "runtime/mutexLocker.hpp" |
|
46 |
#include "runtime/osThread.hpp" |
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47 |
#include "runtime/sharedRuntime.hpp" |
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48 |
#include "runtime/stubRoutines.hpp" |
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#include "runtime/timer.hpp" |
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#include "utilities/events.hpp" |
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#include "utilities/vmError.hpp" |
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52 |
||
53 |
// put OS-includes here |
|
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# include <sys/types.h> |
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# include <sys/mman.h> |
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# include <pthread.h> |
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# include <signal.h> |
|
58 |
# include <errno.h> |
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# include <dlfcn.h> |
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# include <stdlib.h> |
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# include <stdio.h> |
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# include <unistd.h> |
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# include <sys/resource.h> |
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# include <pthread.h> |
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# include <sys/stat.h> |
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# include <sys/time.h> |
|
67 |
# include <sys/utsname.h> |
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# include <sys/socket.h> |
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# include <sys/wait.h> |
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# include <pwd.h> |
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# include <poll.h> |
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# include <ucontext.h> |
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# include <fpu_control.h> |
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# include <asm/ptrace.h> |
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75 |
||
76 |
#define SPELL_REG_SP "sp" |
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77 |
||
78 |
// Don't #define SPELL_REG_FP for thumb because it is not safe to use, so this makes sure we never fetch it. |
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#ifndef __thumb__ |
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#define SPELL_REG_FP AARCH64_ONLY("x29") NOT_AARCH64("fp") |
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#endif |
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||
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address os::current_stack_pointer() { |
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register address sp __asm__ (SPELL_REG_SP); |
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return sp; |
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} |
|
87 |
||
88 |
char* os::non_memory_address_word() { |
|
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// Must never look like an address returned by reserve_memory |
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return (char*) -1; |
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} |
|
92 |
||
93 |
void os::initialize_thread(Thread* thr) { |
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// Nothing to do |
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} |
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96 |
||
97 |
#ifdef AARCH64 |
|
98 |
||
99 |
#define arm_pc pc |
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100 |
#define arm_sp sp |
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101 |
#define arm_fp regs[29] |
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#define arm_r0 regs[0] |
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#define ARM_REGS_IN_CONTEXT 31 |
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104 |
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#else |
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106 |
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107 |
#if NGREG == 16 |
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108 |
// These definitions are based on the observation that until |
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109 |
// the certain version of GCC mcontext_t was defined as |
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// a structure containing gregs[NGREG] array with 16 elements. |
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// In later GCC versions mcontext_t was redefined as struct sigcontext, |
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// along with NGREG constant changed to 18. |
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#define arm_pc gregs[15] |
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#define arm_sp gregs[13] |
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#define arm_fp gregs[11] |
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#define arm_r0 gregs[0] |
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#endif |
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118 |
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119 |
#define ARM_REGS_IN_CONTEXT 16 |
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#endif // AARCH64 |
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address os::Linux::ucontext_get_pc(const ucontext_t* uc) { |
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return (address)uc->uc_mcontext.arm_pc; |
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} |
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126 |
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127 |
void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { |
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uc->uc_mcontext.arm_pc = (uintx)pc; |
|
129 |
} |
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130 |
||
131 |
intptr_t* os::Linux::ucontext_get_sp(const ucontext_t* uc) { |
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132 |
return (intptr_t*)uc->uc_mcontext.arm_sp; |
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} |
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||
135 |
intptr_t* os::Linux::ucontext_get_fp(const ucontext_t* uc) { |
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136 |
return (intptr_t*)uc->uc_mcontext.arm_fp; |
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} |
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138 |
||
139 |
bool is_safe_for_fp(address pc) { |
|
140 |
#ifdef __thumb__ |
|
141 |
if (CodeCache::find_blob(pc) != NULL) { |
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return true; |
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} |
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// For thumb C frames, given an fp we have no idea how to access the frame contents. |
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return false; |
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#else |
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// Calling os::address_is_in_vm() here leads to a dladdr call. Calling any libc |
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// function during os::get_native_stack() can result in a deadlock if JFR is |
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// enabled. For now, be more lenient and allow all pc's. There are other |
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// frame sanity checks in shared code, and to date they have been sufficient |
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// for other platforms. |
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//return os::address_is_in_vm(pc); |
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return true; |
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#endif |
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} |
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157 |
// For Forte Analyzer AsyncGetCallTrace profiling support - thread |
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// is currently interrupted by SIGPROF. |
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// os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal |
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160 |
// frames. Currently we don't do that on Linux, so it's the same as |
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// os::fetch_frame_from_context(). |
|
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ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, |
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const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { |
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165 |
assert(thread != NULL, "just checking"); |
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166 |
assert(ret_sp != NULL, "just checking"); |
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167 |
assert(ret_fp != NULL, "just checking"); |
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168 |
||
169 |
return os::fetch_frame_from_context(uc, ret_sp, ret_fp); |
|
170 |
} |
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171 |
||
172 |
ExtendedPC os::fetch_frame_from_context(const void* ucVoid, |
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173 |
intptr_t** ret_sp, intptr_t** ret_fp) { |
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174 |
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175 |
ExtendedPC epc; |
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const ucontext_t* uc = (const ucontext_t*)ucVoid; |
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177 |
||
178 |
if (uc != NULL) { |
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179 |
epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); |
|
180 |
if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc); |
|
181 |
if (ret_fp) { |
|
182 |
intptr_t* fp = os::Linux::ucontext_get_fp(uc); |
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183 |
#ifndef __thumb__ |
|
184 |
if (CodeCache::find_blob(epc.pc()) == NULL) { |
|
185 |
// It's a C frame. We need to adjust the fp. |
|
186 |
fp += os::C_frame_offset; |
|
187 |
} |
|
188 |
#endif |
|
189 |
// Clear FP when stack walking is dangerous so that |
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// the frame created will not be walked. |
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// However, ensure FP is set correctly when reliable and |
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// potentially necessary. |
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193 |
if (!is_safe_for_fp(epc.pc())) { |
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194 |
// FP unreliable |
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195 |
fp = (intptr_t *)NULL; |
|
196 |
} |
|
197 |
*ret_fp = fp; |
|
198 |
} |
|
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} else { |
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200 |
// construct empty ExtendedPC for return value checking |
|
201 |
epc = ExtendedPC(NULL); |
|
202 |
if (ret_sp) *ret_sp = (intptr_t *)NULL; |
|
203 |
if (ret_fp) *ret_fp = (intptr_t *)NULL; |
|
204 |
} |
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205 |
||
206 |
return epc; |
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207 |
} |
|
208 |
||
209 |
frame os::fetch_frame_from_context(const void* ucVoid) { |
|
210 |
intptr_t* sp; |
|
211 |
intptr_t* fp; |
|
212 |
ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); |
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return frame(sp, fp, epc.pc()); |
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214 |
} |
|
215 |
||
216 |
frame os::get_sender_for_C_frame(frame* fr) { |
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217 |
#ifdef __thumb__ |
|
218 |
// We can't reliably get anything from a thumb C frame. |
|
219 |
return frame(); |
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220 |
#else |
|
221 |
address pc = fr->sender_pc(); |
|
222 |
if (! is_safe_for_fp(pc)) { |
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223 |
return frame(fr->sender_sp(), (intptr_t *)NULL, pc); |
|
224 |
} else { |
|
225 |
return frame(fr->sender_sp(), fr->link() + os::C_frame_offset, pc); |
|
226 |
} |
|
227 |
#endif |
|
228 |
} |
|
229 |
||
230 |
// |
|
231 |
// This actually returns two frames up. It does not return os::current_frame(), |
|
232 |
// which is the actual current frame. Nor does it return os::get_native_stack(), |
|
233 |
// which is the caller. It returns whoever called os::get_native_stack(). Not |
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234 |
// very intuitive, but consistent with how this API is implemented on other |
|
235 |
// platforms. |
|
236 |
// |
|
237 |
frame os::current_frame() { |
|
238 |
#ifdef __thumb__ |
|
239 |
// We can't reliably get anything from a thumb C frame. |
|
240 |
return frame(); |
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241 |
#else |
|
242 |
register intptr_t* fp __asm__ (SPELL_REG_FP); |
|
243 |
// fp is for os::current_frame. We want the fp for our caller. |
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244 |
frame myframe((intptr_t*)os::current_stack_pointer(), fp + os::C_frame_offset, |
|
245 |
CAST_FROM_FN_PTR(address, os::current_frame)); |
|
246 |
frame caller_frame = os::get_sender_for_C_frame(&myframe); |
|
247 |
||
248 |
if (os::is_first_C_frame(&caller_frame)) { |
|
249 |
// stack is not walkable |
|
250 |
// Assert below was added because it does not seem like this can ever happen. |
|
251 |
// How can this frame ever be the first C frame since it is called from C code? |
|
252 |
// If it does ever happen, undo the assert and comment here on when/why it happens. |
|
253 |
assert(false, "this should never happen"); |
|
254 |
return frame(); |
|
255 |
} |
|
256 |
||
257 |
// return frame for our caller's caller |
|
258 |
return os::get_sender_for_C_frame(&caller_frame); |
|
259 |
#endif |
|
260 |
} |
|
261 |
||
262 |
#ifndef AARCH64 |
|
263 |
extern "C" address check_vfp_fault_instr; |
|
264 |
extern "C" address check_vfp3_32_fault_instr; |
|
265 |
||
266 |
address check_vfp_fault_instr = NULL; |
|
267 |
address check_vfp3_32_fault_instr = NULL; |
|
268 |
#endif // !AARCH64 |
|
269 |
extern "C" address check_simd_fault_instr; |
|
270 |
address check_simd_fault_instr = NULL; |
|
271 |
||
272 |
// Utility functions |
|
273 |
||
274 |
extern "C" int JVM_handle_linux_signal(int sig, siginfo_t* info, |
|
275 |
void* ucVoid, int abort_if_unrecognized) { |
|
276 |
ucontext_t* uc = (ucontext_t*) ucVoid; |
|
277 |
||
278 |
Thread* t = Thread::current_or_null_safe(); |
|
279 |
||
280 |
// Must do this before SignalHandlerMark, if crash protection installed we will longjmp away |
|
281 |
// (no destructors can be run) |
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282 |
os::ThreadCrashProtection::check_crash_protection(sig, t); |
42664 | 283 |
|
284 |
SignalHandlerMark shm(t); |
|
285 |
||
286 |
if (sig == SIGILL && |
|
287 |
((info->si_addr == (caddr_t)check_simd_fault_instr) |
|
288 |
NOT_AARCH64(|| info->si_addr == (caddr_t)check_vfp_fault_instr) |
|
289 |
NOT_AARCH64(|| info->si_addr == (caddr_t)check_vfp3_32_fault_instr))) { |
|
290 |
// skip faulty instruction + instruction that sets return value to |
|
291 |
// success and set return value to failure. |
|
292 |
os::Linux::ucontext_set_pc(uc, (address)info->si_addr + 8); |
|
293 |
uc->uc_mcontext.arm_r0 = 0; |
|
294 |
return true; |
|
295 |
} |
|
296 |
||
297 |
// Note: it's not uncommon that JNI code uses signal/sigset to install |
|
298 |
// then restore certain signal handler (e.g. to temporarily block SIGPIPE, |
|
299 |
// or have a SIGILL handler when detecting CPU type). When that happens, |
|
300 |
// JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To |
|
301 |
// avoid unnecessary crash when libjsig is not preloaded, try handle signals |
|
302 |
// that do not require siginfo/ucontext first. |
|
303 |
||
304 |
if (sig == SIGPIPE || sig == SIGXFSZ) { |
|
305 |
// allow chained handler to go first |
|
306 |
if (os::Linux::chained_handler(sig, info, ucVoid)) { |
|
307 |
return true; |
|
308 |
} else { |
|
309 |
// Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 |
|
310 |
return true; |
|
311 |
} |
|
312 |
} |
|
313 |
||
314 |
JavaThread* thread = NULL; |
|
315 |
VMThread* vmthread = NULL; |
|
316 |
if (os::Linux::signal_handlers_are_installed) { |
|
317 |
if (t != NULL ){ |
|
318 |
if(t->is_Java_thread()) { |
|
319 |
thread = (JavaThread*)t; |
|
320 |
} |
|
321 |
else if(t->is_VM_thread()){ |
|
322 |
vmthread = (VMThread *)t; |
|
323 |
} |
|
324 |
} |
|
325 |
} |
|
326 |
||
327 |
address stub = NULL; |
|
328 |
address pc = NULL; |
|
329 |
bool unsafe_access = false; |
|
330 |
||
331 |
if (info != NULL && uc != NULL && thread != NULL) { |
|
332 |
pc = (address) os::Linux::ucontext_get_pc(uc); |
|
333 |
||
334 |
// Handle ALL stack overflow variations here |
|
335 |
if (sig == SIGSEGV) { |
|
336 |
address addr = (address) info->si_addr; |
|
337 |
||
338 |
if (StubRoutines::is_safefetch_fault(pc)) { |
|
339 |
os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); |
|
340 |
return 1; |
|
341 |
} |
|
342 |
// check if fault address is within thread stack |
|
343 |
if (addr < thread->stack_base() && |
|
344 |
addr >= thread->stack_base() - thread->stack_size()) { |
|
345 |
// stack overflow |
|
346 |
if (thread->in_stack_yellow_reserved_zone(addr)) { |
|
347 |
thread->disable_stack_yellow_reserved_zone(); |
|
348 |
if (thread->thread_state() == _thread_in_Java) { |
|
349 |
// Throw a stack overflow exception. Guard pages will be reenabled |
|
350 |
// while unwinding the stack. |
|
351 |
stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); |
|
352 |
} else { |
|
353 |
// Thread was in the vm or native code. Return and try to finish. |
|
354 |
return 1; |
|
355 |
} |
|
356 |
} else if (thread->in_stack_red_zone(addr)) { |
|
357 |
// Fatal red zone violation. Disable the guard pages and fall through |
|
358 |
// to handle_unexpected_exception way down below. |
|
359 |
thread->disable_stack_red_zone(); |
|
360 |
tty->print_raw_cr("An irrecoverable stack overflow has occurred."); |
|
361 |
} else { |
|
362 |
// Accessing stack address below sp may cause SEGV if current |
|
363 |
// thread has MAP_GROWSDOWN stack. This should only happen when |
|
364 |
// current thread was created by user code with MAP_GROWSDOWN flag |
|
365 |
// and then attached to VM. See notes in os_linux.cpp. |
|
366 |
if (thread->osthread()->expanding_stack() == 0) { |
|
367 |
thread->osthread()->set_expanding_stack(); |
|
368 |
if (os::Linux::manually_expand_stack(thread, addr)) { |
|
369 |
thread->osthread()->clear_expanding_stack(); |
|
370 |
return 1; |
|
371 |
} |
|
372 |
thread->osthread()->clear_expanding_stack(); |
|
373 |
} else { |
|
374 |
fatal("recursive segv. expanding stack."); |
|
375 |
} |
|
376 |
} |
|
377 |
} |
|
378 |
} |
|
379 |
||
380 |
if (thread->thread_state() == _thread_in_Java) { |
|
381 |
// Java thread running in Java code => find exception handler if any |
|
382 |
// a fault inside compiled code, the interpreter, or a stub |
|
383 |
||
384 |
if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { |
|
385 |
stub = SharedRuntime::get_poll_stub(pc); |
|
386 |
} else if (sig == SIGBUS) { |
|
387 |
// BugId 4454115: A read from a MappedByteBuffer can fault |
|
388 |
// here if the underlying file has been truncated. |
|
389 |
// Do not crash the VM in such a case. |
|
390 |
CodeBlob* cb = CodeCache::find_blob_unsafe(pc); |
|
391 |
CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; |
|
392 |
if (nm != NULL && nm->has_unsafe_access()) { |
|
393 |
unsafe_access = true; |
|
394 |
} |
|
395 |
} else if (sig == SIGSEGV && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { |
|
396 |
// Determination of interpreter/vtable stub/compiled code null exception |
|
397 |
CodeBlob* cb = CodeCache::find_blob_unsafe(pc); |
|
398 |
if (cb != NULL) { |
|
399 |
stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); |
|
400 |
} |
|
401 |
} else if (sig == SIGILL && *(int *)pc == NativeInstruction::zombie_illegal_instruction) { |
|
402 |
// Zombie |
|
403 |
stub = SharedRuntime::get_handle_wrong_method_stub(); |
|
404 |
} |
|
405 |
} else if (thread->thread_state() == _thread_in_vm && |
|
406 |
sig == SIGBUS && thread->doing_unsafe_access()) { |
|
407 |
unsafe_access = true; |
|
408 |
} |
|
409 |
||
410 |
// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in |
|
411 |
// and the heap gets shrunk before the field access. |
|
412 |
if (sig == SIGSEGV || sig == SIGBUS) { |
|
413 |
address addr = JNI_FastGetField::find_slowcase_pc(pc); |
|
414 |
if (addr != (address)-1) { |
|
415 |
stub = addr; |
|
416 |
} |
|
417 |
} |
|
418 |
||
419 |
// Check to see if we caught the safepoint code in the |
|
420 |
// process of write protecting the memory serialization page. |
|
421 |
// It write enables the page immediately after protecting it |
|
422 |
// so we can just return to retry the write. |
|
423 |
if (sig == SIGSEGV && os::is_memory_serialize_page(thread, (address) info->si_addr)) { |
|
424 |
// Block current thread until the memory serialize page permission restored. |
|
425 |
os::block_on_serialize_page_trap(); |
|
426 |
return true; |
|
427 |
} |
|
428 |
} |
|
429 |
||
430 |
if (unsafe_access && stub == NULL) { |
|
431 |
// it can be an unsafe access and we haven't found |
|
432 |
// any other suitable exception reason, |
|
433 |
// so assume it is an unsafe access. |
|
434 |
address next_pc = pc + Assembler::InstructionSize; |
|
435 |
#ifdef __thumb__ |
|
436 |
if (uc->uc_mcontext.arm_cpsr & PSR_T_BIT) { |
|
437 |
next_pc = (address)((intptr_t)next_pc | 0x1); |
|
438 |
} |
|
439 |
#endif |
|
440 |
||
441 |
stub = SharedRuntime::handle_unsafe_access(thread, next_pc); |
|
442 |
} |
|
443 |
||
444 |
if (stub != NULL) { |
|
445 |
#ifdef __thumb__ |
|
446 |
if (uc->uc_mcontext.arm_cpsr & PSR_T_BIT) { |
|
447 |
intptr_t p = (intptr_t)pc | 0x1; |
|
448 |
pc = (address)p; |
|
449 |
||
450 |
// Clear Thumb mode bit if we're redirected into the ARM ISA based code |
|
451 |
if (((intptr_t)stub & 0x1) == 0) { |
|
452 |
uc->uc_mcontext.arm_cpsr &= ~PSR_T_BIT; |
|
453 |
} |
|
454 |
} else { |
|
455 |
// No Thumb2 compiled stubs are triggered from ARM ISA compiled JIT'd code today. |
|
456 |
// The support needs to be added if that changes |
|
457 |
assert((((intptr_t)stub & 0x1) == 0), "can't return to Thumb code"); |
|
458 |
} |
|
459 |
#endif |
|
460 |
||
461 |
// save all thread context in case we need to restore it |
|
462 |
if (thread != NULL) thread->set_saved_exception_pc(pc); |
|
463 |
||
464 |
os::Linux::ucontext_set_pc(uc, stub); |
|
465 |
return true; |
|
466 |
} |
|
467 |
||
468 |
// signal-chaining |
|
469 |
if (os::Linux::chained_handler(sig, info, ucVoid)) { |
|
470 |
return true; |
|
471 |
} |
|
472 |
||
473 |
if (!abort_if_unrecognized) { |
|
474 |
// caller wants another chance, so give it to him |
|
475 |
return false; |
|
476 |
} |
|
477 |
||
478 |
if (pc == NULL && uc != NULL) { |
|
479 |
pc = os::Linux::ucontext_get_pc(uc); |
|
480 |
} |
|
481 |
||
482 |
// unmask current signal |
|
483 |
sigset_t newset; |
|
484 |
sigemptyset(&newset); |
|
485 |
sigaddset(&newset, sig); |
|
486 |
sigprocmask(SIG_UNBLOCK, &newset, NULL); |
|
487 |
||
488 |
VMError::report_and_die(t, sig, pc, info, ucVoid); |
|
489 |
||
490 |
ShouldNotReachHere(); |
|
491 |
return false; |
|
492 |
} |
|
493 |
||
494 |
void os::Linux::init_thread_fpu_state(void) { |
|
495 |
os::setup_fpu(); |
|
496 |
} |
|
497 |
||
498 |
int os::Linux::get_fpu_control_word(void) { |
|
499 |
return 0; |
|
500 |
} |
|
501 |
||
502 |
void os::Linux::set_fpu_control_word(int fpu_control) { |
|
503 |
// Nothing to do |
|
504 |
} |
|
505 |
||
506 |
void os::setup_fpu() { |
|
507 |
#ifdef AARCH64 |
|
508 |
__asm__ volatile ("msr fpcr, xzr"); |
|
509 |
#else |
|
510 |
#if !defined(__SOFTFP__) && defined(__VFP_FP__) |
|
511 |
// Turn on IEEE-754 compliant VFP mode |
|
512 |
__asm__ volatile ( |
|
513 |
"mov %%r0, #0;" |
|
514 |
"fmxr fpscr, %%r0" |
|
515 |
: /* no output */ : /* no input */ : "r0" |
|
516 |
); |
|
517 |
#endif |
|
518 |
#endif // AARCH64 |
|
519 |
} |
|
520 |
||
521 |
bool os::is_allocatable(size_t bytes) { |
|
522 |
return true; |
|
523 |
} |
|
524 |
||
525 |
//////////////////////////////////////////////////////////////////////////////// |
|
526 |
// thread stack |
|
527 |
||
42907 | 528 |
// Minimum usable stack sizes required to get to user code. Space for |
529 |
// HotSpot guard pages is added later. |
|
530 |
size_t os::Posix::_compiler_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 4)) * K; |
|
531 |
size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 4)) * K; |
|
42664 | 532 |
size_t os::Posix::_vm_internal_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K; |
533 |
||
534 |
// return default stack size for thr_type |
|
535 |
size_t os::Posix::default_stack_size(os::ThreadType thr_type) { |
|
536 |
// default stack size (compiler thread needs larger stack) |
|
537 |
size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); |
|
538 |
return s; |
|
539 |
} |
|
540 |
||
541 |
///////////////////////////////////////////////////////////////////////////// |
|
542 |
// helper functions for fatal error handler |
|
543 |
||
544 |
void os::print_context(outputStream *st, const void *context) { |
|
545 |
if (context == NULL) return; |
|
546 |
const ucontext_t *uc = (const ucontext_t*)context; |
|
547 |
||
548 |
st->print_cr("Registers:"); |
|
549 |
intx* reg_area = (intx*)&uc->uc_mcontext.arm_r0; |
|
550 |
for (int r = 0; r < ARM_REGS_IN_CONTEXT; r++) { |
|
551 |
st->print_cr(" %-3s = " INTPTR_FORMAT, as_Register(r)->name(), reg_area[r]); |
|
552 |
} |
|
553 |
#define U64_FORMAT "0x%016llx" |
|
554 |
#ifdef AARCH64 |
|
555 |
st->print_cr(" %-3s = " U64_FORMAT, "sp", uc->uc_mcontext.sp); |
|
556 |
st->print_cr(" %-3s = " U64_FORMAT, "pc", uc->uc_mcontext.pc); |
|
557 |
st->print_cr(" %-3s = " U64_FORMAT, "pstate", uc->uc_mcontext.pstate); |
|
558 |
#else |
|
559 |
// now print flag register |
|
560 |
st->print_cr(" %-4s = 0x%08lx", "cpsr",uc->uc_mcontext.arm_cpsr); |
|
561 |
#endif |
|
562 |
st->cr(); |
|
563 |
||
564 |
intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); |
|
565 |
st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); |
|
566 |
print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); |
|
567 |
st->cr(); |
|
568 |
||
569 |
// Note: it may be unsafe to inspect memory near pc. For example, pc may |
|
570 |
// point to garbage if entry point in an nmethod is corrupted. Leave |
|
571 |
// this at the end, and hope for the best. |
|
572 |
address pc = os::Linux::ucontext_get_pc(uc); |
|
573 |
st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc)); |
|
574 |
print_hex_dump(st, pc - 32, pc + 32, Assembler::InstructionSize); |
|
575 |
} |
|
576 |
||
577 |
void os::print_register_info(outputStream *st, const void *context) { |
|
578 |
if (context == NULL) return; |
|
579 |
||
580 |
const ucontext_t *uc = (const ucontext_t*)context; |
|
581 |
intx* reg_area = (intx*)&uc->uc_mcontext.arm_r0; |
|
582 |
||
583 |
st->print_cr("Register to memory mapping:"); |
|
584 |
st->cr(); |
|
585 |
for (int r = 0; r < ARM_REGS_IN_CONTEXT; r++) { |
|
586 |
st->print_cr(" %-3s = " INTPTR_FORMAT, as_Register(r)->name(), reg_area[r]); |
|
587 |
print_location(st, reg_area[r]); |
|
588 |
st->cr(); |
|
589 |
} |
|
590 |
#ifdef AARCH64 |
|
591 |
st->print_cr(" %-3s = " U64_FORMAT, "pc", uc->uc_mcontext.pc); |
|
592 |
print_location(st, uc->uc_mcontext.pc); |
|
593 |
st->cr(); |
|
594 |
#endif |
|
595 |
st->cr(); |
|
596 |
} |
|
597 |
||
598 |
||
599 |
#ifndef AARCH64 |
|
600 |
||
48468 | 601 |
typedef int64_t cmpxchg_long_func_t(int64_t, int64_t, volatile int64_t*); |
42664 | 602 |
|
603 |
cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; |
|
604 |
||
48468 | 605 |
int64_t os::atomic_cmpxchg_long_bootstrap(int64_t compare_value, int64_t exchange_value, volatile int64_t* dest) { |
42664 | 606 |
// try to use the stub: |
607 |
cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); |
|
608 |
||
609 |
if (func != NULL) { |
|
610 |
os::atomic_cmpxchg_long_func = func; |
|
611 |
return (*func)(compare_value, exchange_value, dest); |
|
612 |
} |
|
613 |
assert(Threads::number_of_threads() == 0, "for bootstrap only"); |
|
614 |
||
48468 | 615 |
int64_t old_value = *dest; |
42664 | 616 |
if (old_value == compare_value) |
617 |
*dest = exchange_value; |
|
618 |
return old_value; |
|
619 |
} |
|
48468 | 620 |
typedef int64_t load_long_func_t(const volatile int64_t*); |
42664 | 621 |
|
622 |
load_long_func_t* os::atomic_load_long_func = os::atomic_load_long_bootstrap; |
|
623 |
||
48468 | 624 |
int64_t os::atomic_load_long_bootstrap(const volatile int64_t* src) { |
42664 | 625 |
// try to use the stub: |
626 |
load_long_func_t* func = CAST_TO_FN_PTR(load_long_func_t*, StubRoutines::atomic_load_long_entry()); |
|
627 |
||
628 |
if (func != NULL) { |
|
629 |
os::atomic_load_long_func = func; |
|
630 |
return (*func)(src); |
|
631 |
} |
|
632 |
assert(Threads::number_of_threads() == 0, "for bootstrap only"); |
|
633 |
||
48468 | 634 |
int64_t old_value = *src; |
42664 | 635 |
return old_value; |
636 |
} |
|
637 |
||
48468 | 638 |
typedef void store_long_func_t(int64_t, volatile int64_t*); |
42664 | 639 |
|
640 |
store_long_func_t* os::atomic_store_long_func = os::atomic_store_long_bootstrap; |
|
641 |
||
48468 | 642 |
void os::atomic_store_long_bootstrap(int64_t val, volatile int64_t* dest) { |
42664 | 643 |
// try to use the stub: |
644 |
store_long_func_t* func = CAST_TO_FN_PTR(store_long_func_t*, StubRoutines::atomic_store_long_entry()); |
|
645 |
||
646 |
if (func != NULL) { |
|
647 |
os::atomic_store_long_func = func; |
|
648 |
return (*func)(val, dest); |
|
649 |
} |
|
650 |
assert(Threads::number_of_threads() == 0, "for bootstrap only"); |
|
651 |
||
652 |
*dest = val; |
|
653 |
} |
|
654 |
||
48468 | 655 |
typedef int32_t atomic_add_func_t(int32_t add_value, volatile int32_t *dest); |
42664 | 656 |
|
657 |
atomic_add_func_t * os::atomic_add_func = os::atomic_add_bootstrap; |
|
658 |
||
48468 | 659 |
int32_t os::atomic_add_bootstrap(int32_t add_value, volatile int32_t *dest) { |
42664 | 660 |
atomic_add_func_t * func = CAST_TO_FN_PTR(atomic_add_func_t*, |
661 |
StubRoutines::atomic_add_entry()); |
|
662 |
if (func != NULL) { |
|
663 |
os::atomic_add_func = func; |
|
664 |
return (*func)(add_value, dest); |
|
665 |
} |
|
666 |
||
48468 | 667 |
int32_t old_value = *dest; |
42664 | 668 |
*dest = old_value + add_value; |
669 |
return (old_value + add_value); |
|
670 |
} |
|
671 |
||
48468 | 672 |
typedef int32_t atomic_xchg_func_t(int32_t exchange_value, volatile int32_t *dest); |
42664 | 673 |
|
674 |
atomic_xchg_func_t * os::atomic_xchg_func = os::atomic_xchg_bootstrap; |
|
675 |
||
48468 | 676 |
int32_t os::atomic_xchg_bootstrap(int32_t exchange_value, volatile int32_t *dest) { |
42664 | 677 |
atomic_xchg_func_t * func = CAST_TO_FN_PTR(atomic_xchg_func_t*, |
678 |
StubRoutines::atomic_xchg_entry()); |
|
679 |
if (func != NULL) { |
|
680 |
os::atomic_xchg_func = func; |
|
681 |
return (*func)(exchange_value, dest); |
|
682 |
} |
|
683 |
||
48468 | 684 |
int32_t old_value = *dest; |
42664 | 685 |
*dest = exchange_value; |
686 |
return (old_value); |
|
687 |
} |
|
688 |
||
48468 | 689 |
typedef int32_t cmpxchg_func_t(int32_t, int32_t, volatile int32_t*); |
42664 | 690 |
|
691 |
cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; |
|
692 |
||
48468 | 693 |
int32_t os::atomic_cmpxchg_bootstrap(int32_t compare_value, int32_t exchange_value, volatile int32_t* dest) { |
42664 | 694 |
// try to use the stub: |
695 |
cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); |
|
696 |
||
697 |
if (func != NULL) { |
|
698 |
os::atomic_cmpxchg_func = func; |
|
699 |
return (*func)(compare_value, exchange_value, dest); |
|
700 |
} |
|
701 |
assert(Threads::number_of_threads() == 0, "for bootstrap only"); |
|
702 |
||
48468 | 703 |
int32_t old_value = *dest; |
42664 | 704 |
if (old_value == compare_value) |
705 |
*dest = exchange_value; |
|
706 |
return old_value; |
|
707 |
} |
|
708 |
||
709 |
#endif // !AARCH64 |
|
710 |
||
711 |
#ifndef PRODUCT |
|
712 |
void os::verify_stack_alignment() { |
|
713 |
} |
|
714 |
#endif |
|
715 |
||
716 |
int os::extra_bang_size_in_bytes() { |
|
717 |
// ARM does not require an additional stack bang. |
|
718 |
return 0; |
|
719 |
} |
|
720 |