Thu, 12 Mar 2009 10:37:46 -0700
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2001-2003 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | /* CopyrightVersion 1.2 */ |
duke@435 | 26 | |
duke@435 | 27 | /* This is a special library that should be loaded before libc & |
duke@435 | 28 | * libthread to interpose the signal handler installation functions: |
duke@435 | 29 | * sigaction(), signal(), sigset(). |
duke@435 | 30 | * Used for signal-chaining. See RFE 4381843. |
duke@435 | 31 | */ |
duke@435 | 32 | |
duke@435 | 33 | #include <stdlib.h> |
duke@435 | 34 | #include <stdio.h> |
duke@435 | 35 | #include <string.h> |
duke@435 | 36 | #include <signal.h> |
duke@435 | 37 | #include <dlfcn.h> |
duke@435 | 38 | #include <thread.h> |
duke@435 | 39 | #include <synch.h> |
duke@435 | 40 | #include "jvm_solaris.h" |
duke@435 | 41 | |
duke@435 | 42 | #define bool int |
duke@435 | 43 | #define true 1 |
duke@435 | 44 | #define false 0 |
duke@435 | 45 | |
duke@435 | 46 | static struct sigaction *sact = (struct sigaction *)NULL; /* saved signal handlers */ |
duke@435 | 47 | static sigset_t jvmsigs; |
duke@435 | 48 | |
duke@435 | 49 | /* used to synchronize the installation of signal handlers */ |
duke@435 | 50 | static mutex_t mutex = DEFAULTMUTEX; |
duke@435 | 51 | static cond_t cond = DEFAULTCV; |
duke@435 | 52 | static thread_t tid = 0; |
duke@435 | 53 | |
duke@435 | 54 | typedef void (*sa_handler_t)(int); |
duke@435 | 55 | typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); |
duke@435 | 56 | typedef sa_handler_t (*signal_t)(int, sa_handler_t); |
duke@435 | 57 | typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *); |
duke@435 | 58 | |
duke@435 | 59 | static signal_t os_signal = 0; /* os's version of signal()/sigset() */ |
duke@435 | 60 | static sigaction_t os_sigaction = 0; /* os's version of sigaction() */ |
duke@435 | 61 | |
duke@435 | 62 | static bool jvm_signal_installing = false; |
duke@435 | 63 | static bool jvm_signal_installed = false; |
duke@435 | 64 | |
duke@435 | 65 | |
duke@435 | 66 | /* assume called within signal_lock */ |
duke@435 | 67 | static void allocate_sact() { |
duke@435 | 68 | size_t maxsignum; |
duke@435 | 69 | maxsignum = SIGRTMAX; |
duke@435 | 70 | if (sact == NULL) { |
duke@435 | 71 | sact = (struct sigaction *)malloc((maxsignum+1) * (size_t)sizeof(struct sigaction)); |
duke@435 | 72 | memset(sact, 0, (maxsignum+1) * (size_t)sizeof(struct sigaction)); |
duke@435 | 73 | } |
duke@435 | 74 | |
duke@435 | 75 | if (sact == NULL) { |
duke@435 | 76 | printf("%s\n", "libjsig.so unable to allocate memory"); |
duke@435 | 77 | exit(0); |
duke@435 | 78 | } |
duke@435 | 79 | |
duke@435 | 80 | sigemptyset(&jvmsigs); |
duke@435 | 81 | } |
duke@435 | 82 | |
duke@435 | 83 | static void signal_lock() { |
duke@435 | 84 | mutex_lock(&mutex); |
duke@435 | 85 | /* When the jvm is installing its set of signal handlers, threads |
duke@435 | 86 | * other than the jvm thread should wait */ |
duke@435 | 87 | if (jvm_signal_installing) { |
duke@435 | 88 | if (tid != thr_self()) { |
duke@435 | 89 | cond_wait(&cond, &mutex); |
duke@435 | 90 | } |
duke@435 | 91 | } |
duke@435 | 92 | } |
duke@435 | 93 | |
duke@435 | 94 | static void signal_unlock() { |
duke@435 | 95 | mutex_unlock(&mutex); |
duke@435 | 96 | } |
duke@435 | 97 | |
duke@435 | 98 | static sa_handler_t call_os_signal(int sig, sa_handler_t disp, |
duke@435 | 99 | bool is_sigset) { |
duke@435 | 100 | if (os_signal == NULL) { |
duke@435 | 101 | if (!is_sigset) { |
duke@435 | 102 | os_signal = (signal_t)dlsym(RTLD_NEXT, "signal"); |
duke@435 | 103 | } else { |
duke@435 | 104 | os_signal = (signal_t)dlsym(RTLD_NEXT, "sigset"); |
duke@435 | 105 | } |
duke@435 | 106 | if (os_signal == NULL) { |
duke@435 | 107 | printf("%s\n", dlerror()); |
duke@435 | 108 | exit(0); |
duke@435 | 109 | } |
duke@435 | 110 | } |
duke@435 | 111 | return (*os_signal)(sig, disp); |
duke@435 | 112 | } |
duke@435 | 113 | |
duke@435 | 114 | static void save_signal_handler(int sig, sa_handler_t disp, bool is_sigset) { |
duke@435 | 115 | sigset_t set; |
duke@435 | 116 | if (sact == NULL) { |
duke@435 | 117 | allocate_sact(); |
duke@435 | 118 | } |
duke@435 | 119 | sact[sig].sa_handler = disp; |
duke@435 | 120 | sigemptyset(&set); |
duke@435 | 121 | sact[sig].sa_mask = set; |
duke@435 | 122 | if (!is_sigset) { |
duke@435 | 123 | sact[sig].sa_flags = SA_NODEFER; |
duke@435 | 124 | if (sig != SIGILL && sig != SIGTRAP && sig != SIGPWR) { |
duke@435 | 125 | sact[sig].sa_flags |= SA_RESETHAND; |
duke@435 | 126 | } |
duke@435 | 127 | } else { |
duke@435 | 128 | sact[sig].sa_flags = 0; |
duke@435 | 129 | } |
duke@435 | 130 | } |
duke@435 | 131 | |
duke@435 | 132 | static sa_handler_t set_signal(int sig, sa_handler_t disp, bool is_sigset) { |
duke@435 | 133 | sa_handler_t oldhandler; |
duke@435 | 134 | bool sigblocked; |
duke@435 | 135 | |
duke@435 | 136 | signal_lock(); |
duke@435 | 137 | if (sact == NULL) { |
duke@435 | 138 | allocate_sact(); |
duke@435 | 139 | } |
duke@435 | 140 | |
duke@435 | 141 | if (jvm_signal_installed && sigismember(&jvmsigs, sig)) { |
duke@435 | 142 | /* jvm has installed its signal handler for this signal. */ |
duke@435 | 143 | /* Save the handler. Don't really install it. */ |
duke@435 | 144 | if (is_sigset) { |
duke@435 | 145 | /* We won't honor the SIG_HOLD request to change the signal mask */ |
duke@435 | 146 | sigblocked = sigismember(&(sact[sig].sa_mask), sig); |
duke@435 | 147 | } |
duke@435 | 148 | oldhandler = sact[sig].sa_handler; |
duke@435 | 149 | save_signal_handler(sig, disp, is_sigset); |
duke@435 | 150 | |
duke@435 | 151 | if (is_sigset && sigblocked) { |
duke@435 | 152 | oldhandler = SIG_HOLD; |
duke@435 | 153 | } |
duke@435 | 154 | |
duke@435 | 155 | signal_unlock(); |
duke@435 | 156 | return oldhandler; |
duke@435 | 157 | } else if (jvm_signal_installing) { |
duke@435 | 158 | /* jvm is installing its signal handlers. Install the new |
duke@435 | 159 | * handlers and save the old ones. jvm uses sigaction(). |
duke@435 | 160 | * Leave the piece here just in case. */ |
duke@435 | 161 | oldhandler = call_os_signal(sig, disp, is_sigset); |
duke@435 | 162 | save_signal_handler(sig, oldhandler, is_sigset); |
duke@435 | 163 | |
duke@435 | 164 | /* Record the signals used by jvm */ |
duke@435 | 165 | sigaddset(&jvmsigs, sig); |
duke@435 | 166 | |
duke@435 | 167 | signal_unlock(); |
duke@435 | 168 | return oldhandler; |
duke@435 | 169 | } else { |
duke@435 | 170 | /* jvm has no relation with this signal (yet). Install the |
duke@435 | 171 | * the handler. */ |
duke@435 | 172 | oldhandler = call_os_signal(sig, disp, is_sigset); |
duke@435 | 173 | |
duke@435 | 174 | signal_unlock(); |
duke@435 | 175 | return oldhandler; |
duke@435 | 176 | } |
duke@435 | 177 | } |
duke@435 | 178 | |
duke@435 | 179 | sa_handler_t signal(int sig, sa_handler_t disp) { |
duke@435 | 180 | return set_signal(sig, disp, false); |
duke@435 | 181 | } |
duke@435 | 182 | |
duke@435 | 183 | sa_handler_t sigset(int sig, sa_handler_t disp) { |
duke@435 | 184 | return set_signal(sig, disp, true); |
duke@435 | 185 | } |
duke@435 | 186 | |
duke@435 | 187 | static int call_os_sigaction(int sig, const struct sigaction *act, |
duke@435 | 188 | struct sigaction *oact) { |
duke@435 | 189 | if (os_sigaction == NULL) { |
duke@435 | 190 | os_sigaction = (sigaction_t)dlsym(RTLD_NEXT, "sigaction"); |
duke@435 | 191 | if (os_sigaction == NULL) { |
duke@435 | 192 | printf("%s\n", dlerror()); |
duke@435 | 193 | exit(0); |
duke@435 | 194 | } |
duke@435 | 195 | } |
duke@435 | 196 | return (*os_sigaction)(sig, act, oact); |
duke@435 | 197 | } |
duke@435 | 198 | |
duke@435 | 199 | int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) { |
duke@435 | 200 | int res; |
duke@435 | 201 | struct sigaction oldAct; |
duke@435 | 202 | |
duke@435 | 203 | signal_lock(); |
duke@435 | 204 | |
duke@435 | 205 | if (sact == NULL ) { |
duke@435 | 206 | allocate_sact(); |
duke@435 | 207 | } |
duke@435 | 208 | if (jvm_signal_installed && sigismember(&jvmsigs, sig)) { |
duke@435 | 209 | /* jvm has installed its signal handler for this signal. */ |
duke@435 | 210 | /* Save the handler. Don't really install it. */ |
duke@435 | 211 | if (oact != NULL) { |
duke@435 | 212 | *oact = sact[sig]; |
duke@435 | 213 | } |
duke@435 | 214 | if (act != NULL) { |
duke@435 | 215 | sact[sig] = *act; |
duke@435 | 216 | } |
duke@435 | 217 | |
duke@435 | 218 | signal_unlock(); |
duke@435 | 219 | return 0; |
duke@435 | 220 | } else if (jvm_signal_installing) { |
duke@435 | 221 | /* jvm is installing its signal handlers. Install the new |
duke@435 | 222 | * handlers and save the old ones. */ |
duke@435 | 223 | res = call_os_sigaction(sig, act, &oldAct); |
duke@435 | 224 | sact[sig] = oldAct; |
duke@435 | 225 | if (oact != NULL) { |
duke@435 | 226 | *oact = oldAct; |
duke@435 | 227 | } |
duke@435 | 228 | |
duke@435 | 229 | /* Record the signals used by jvm */ |
duke@435 | 230 | sigaddset(&jvmsigs, sig); |
duke@435 | 231 | |
duke@435 | 232 | signal_unlock(); |
duke@435 | 233 | return res; |
duke@435 | 234 | } else { |
duke@435 | 235 | /* jvm has no relation with this signal (yet). Install the |
duke@435 | 236 | * the handler. */ |
duke@435 | 237 | res = call_os_sigaction(sig, act, oact); |
duke@435 | 238 | |
duke@435 | 239 | signal_unlock(); |
duke@435 | 240 | return res; |
duke@435 | 241 | } |
duke@435 | 242 | } |
duke@435 | 243 | |
duke@435 | 244 | /* The four functions for the jvm to call into */ |
duke@435 | 245 | void JVM_begin_signal_setting() { |
duke@435 | 246 | signal_lock(); |
duke@435 | 247 | jvm_signal_installing = true; |
duke@435 | 248 | tid = thr_self(); |
duke@435 | 249 | signal_unlock(); |
duke@435 | 250 | } |
duke@435 | 251 | |
duke@435 | 252 | void JVM_end_signal_setting() { |
duke@435 | 253 | signal_lock(); |
duke@435 | 254 | jvm_signal_installed = true; |
duke@435 | 255 | jvm_signal_installing = false; |
duke@435 | 256 | cond_broadcast(&cond); |
duke@435 | 257 | signal_unlock(); |
duke@435 | 258 | } |
duke@435 | 259 | |
duke@435 | 260 | struct sigaction *JVM_get_signal_action(int sig) { |
duke@435 | 261 | if (sact == NULL) { |
duke@435 | 262 | allocate_sact(); |
duke@435 | 263 | } |
duke@435 | 264 | /* Does race condition make sense here? */ |
duke@435 | 265 | if (sigismember(&jvmsigs, sig)) { |
duke@435 | 266 | return &sact[sig]; |
duke@435 | 267 | } |
duke@435 | 268 | return NULL; |
duke@435 | 269 | } |
duke@435 | 270 | |
duke@435 | 271 | int JVM_get_libjsig_version() { |
duke@435 | 272 | return JSIG_VERSION_1_4_1; |
duke@435 | 273 | } |