1 /* 2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include <jni.h> 26 #include "libproc.h" 27 28 #include <elf.h> 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <fcntl.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <limits.h> 35 36 #if defined(x86_64) && !defined(amd64) 37 #define amd64 1 38 #endif 39 40 #ifdef i386 41 #include "sun_jvm_hotspot_debugger_x86_X86ThreadContext.h" 42 #endif 43 44 #ifdef amd64 45 #include "sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext.h" 46 #endif 47 48 #if defined(sparc) || defined(sparcv9) 49 #include "sun_jvm_hotspot_debugger_sparc_SPARCThreadContext.h" 50 #endif 51 52 static jfieldID p_ps_prochandle_ID = 0; 53 static jfieldID threadList_ID = 0; 54 static jfieldID loadObjectList_ID = 0; 55 56 static jmethodID createClosestSymbol_ID = 0; 57 static jmethodID createLoadObject_ID = 0; 58 static jmethodID getThreadForThreadId_ID = 0; 59 static jmethodID listAdd_ID = 0; 60 61 #define CHECK_EXCEPTION_(value) if ((*env)->ExceptionOccurred(env)) { return value; } 62 #define CHECK_EXCEPTION if ((*env)->ExceptionOccurred(env)) { return;} 63 #define THROW_NEW_DEBUGGER_EXCEPTION_(str, value) { throw_new_debugger_exception(env, str); return value; } 64 #define THROW_NEW_DEBUGGER_EXCEPTION(str) { throw_new_debugger_exception(env, str); return;} 65 66 void throw_new_debugger_exception(JNIEnv* env, const char* errMsg) { 67 (*env)->ThrowNew(env, (*env)->FindClass(env, "sun/jvm/hotspot/debugger/DebuggerException"), errMsg); 68 } 69 70 struct ps_prochandle* get_proc_handle(JNIEnv* env, jobject this_obj) { 71 jlong ptr = (*env)->GetLongField(env, this_obj, p_ps_prochandle_ID); 72 return (struct ps_prochandle*)(intptr_t)ptr; 73 } 74 75 /* 76 * Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal 77 * Method: init0 78 * Signature: ()V 79 */ 80 JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_init0 81 (JNIEnv *env, jclass cls) { 82 jclass listClass; 83 84 if (init_libproc(getenv("LIBSAPROC_DEBUG") != NULL) != true) { 85 THROW_NEW_DEBUGGER_EXCEPTION("can't initialize libproc"); 86 } 87 88 // fields we use 89 p_ps_prochandle_ID = (*env)->GetFieldID(env, cls, "p_ps_prochandle", "J"); 90 CHECK_EXCEPTION; 91 threadList_ID = (*env)->GetFieldID(env, cls, "threadList", "Ljava/util/List;"); 92 CHECK_EXCEPTION; 93 loadObjectList_ID = (*env)->GetFieldID(env, cls, "loadObjectList", "Ljava/util/List;"); 94 CHECK_EXCEPTION; 95 96 // methods we use 97 createClosestSymbol_ID = (*env)->GetMethodID(env, cls, "createClosestSymbol", 98 "(Ljava/lang/String;J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol;"); 99 CHECK_EXCEPTION; 100 createLoadObject_ID = (*env)->GetMethodID(env, cls, "createLoadObject", 101 "(Ljava/lang/String;JJ)Lsun/jvm/hotspot/debugger/cdbg/LoadObject;"); 102 CHECK_EXCEPTION; 103 getThreadForThreadId_ID = (*env)->GetMethodID(env, cls, "getThreadForThreadId", 104 "(J)Lsun/jvm/hotspot/debugger/ThreadProxy;"); 105 CHECK_EXCEPTION; 106 // java.util.List method we call 107 listClass = (*env)->FindClass(env, "java/util/List"); 108 CHECK_EXCEPTION; 109 listAdd_ID = (*env)->GetMethodID(env, listClass, "add", "(Ljava/lang/Object;)Z"); 110 CHECK_EXCEPTION; 111 } 112 113 JNIEXPORT jint JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_getAddressSize 114 (JNIEnv *env, jclass cls) 115 { 116 #ifdef _LP64 117 return 8; 118 #else 119 return 4; 120 #endif 121 122 } 123 124 125 static void fillThreadsAndLoadObjects(JNIEnv* env, jobject this_obj, struct ps_prochandle* ph) { 126 int n = 0, i = 0; 127 128 // add threads 129 n = get_num_threads(ph); 130 for (i = 0; i < n; i++) { 131 jobject thread; 132 jobject threadList; 133 lwpid_t lwpid; 134 135 lwpid = get_lwp_id(ph, i); 136 thread = (*env)->CallObjectMethod(env, this_obj, getThreadForThreadId_ID, 137 (jlong)lwpid); 138 CHECK_EXCEPTION; 139 threadList = (*env)->GetObjectField(env, this_obj, threadList_ID); 140 CHECK_EXCEPTION; 141 (*env)->CallBooleanMethod(env, threadList, listAdd_ID, thread); 142 CHECK_EXCEPTION; 143 } 144 145 // add load objects 146 n = get_num_libs(ph); 147 for (i = 0; i < n; i++) { 148 uintptr_t base; 149 const char* name; 150 jobject loadObject; 151 jobject loadObjectList; 152 153 base = get_lib_base(ph, i); 154 name = get_lib_name(ph, i); 155 loadObject = (*env)->CallObjectMethod(env, this_obj, createLoadObject_ID, 156 (*env)->NewStringUTF(env, name), (jlong)0, (jlong)base); 157 CHECK_EXCEPTION; 158 loadObjectList = (*env)->GetObjectField(env, this_obj, loadObjectList_ID); 159 CHECK_EXCEPTION; 160 (*env)->CallBooleanMethod(env, loadObjectList, listAdd_ID, loadObject); 161 CHECK_EXCEPTION; 162 } 163 } 164 165 166 /* 167 * Verify that a named ELF binary file (core or executable) has the same 168 * bitness as ourselves. 169 * Throw an exception if there is a mismatch or other problem. 170 * 171 * If we proceed using a mismatched debugger/debuggee, the best to hope 172 * for is a missing symbol, the worst is a crash searching for debug symbols. 173 */ 174 void verifyBitness(JNIEnv *env, const char *binaryName) { 175 int fd = open(binaryName, O_RDONLY); 176 if (fd < 0) { 177 THROW_NEW_DEBUGGER_EXCEPTION("cannot open binary file"); 178 } 179 unsigned char elf_ident[EI_NIDENT]; 180 int i = read(fd, &elf_ident, sizeof(elf_ident)); 181 close(fd); 182 183 if (i < 0) { 184 THROW_NEW_DEBUGGER_EXCEPTION("cannot read binary file"); 185 } 186 #ifndef _LP64 187 if (elf_ident[EI_CLASS] == ELFCLASS64) { 188 THROW_NEW_DEBUGGER_EXCEPTION("debuggee is 64 bit, use 64-bit java for debugger"); 189 } 190 #else 191 if (elf_ident[EI_CLASS] != ELFCLASS64) { 192 THROW_NEW_DEBUGGER_EXCEPTION("debuggee is 32 bit, use 32 bit java for debugger"); 193 } 194 #endif 195 } 196 197 198 /* 199 * Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal 200 * Method: attach0 201 * Signature: (I)V 202 */ 203 JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_attach0__I 204 (JNIEnv *env, jobject this_obj, jint jpid) { 205 206 // For bitness checking, locate binary at /proc/jpid/exe 207 char buf[PATH_MAX]; 208 snprintf((char *) &buf, PATH_MAX, "/proc/%d/exe", jpid); 209 verifyBitness(env, (char *) &buf); 210 CHECK_EXCEPTION; 211 212 char err_buf[200]; 213 struct ps_prochandle* ph; 214 if ( (ph = Pgrab(jpid, err_buf, sizeof(err_buf))) == NULL) { 215 char msg[230]; 216 snprintf(msg, sizeof(msg), "Can't attach to the process: %s", err_buf); 217 THROW_NEW_DEBUGGER_EXCEPTION(msg); 218 } 219 (*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph); 220 fillThreadsAndLoadObjects(env, this_obj, ph); 221 } 222 223 /* 224 * Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal 225 * Method: attach0 226 * Signature: (Ljava/lang/String;Ljava/lang/String;)V 227 */ 228 JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_attach0__Ljava_lang_String_2Ljava_lang_String_2 229 (JNIEnv *env, jobject this_obj, jstring execName, jstring coreName) { 230 const char *execName_cstr; 231 const char *coreName_cstr; 232 jboolean isCopy; 233 struct ps_prochandle* ph; 234 235 execName_cstr = (*env)->GetStringUTFChars(env, execName, &isCopy); 236 CHECK_EXCEPTION; 237 coreName_cstr = (*env)->GetStringUTFChars(env, coreName, &isCopy); 238 CHECK_EXCEPTION; 239 240 verifyBitness(env, execName_cstr); 241 CHECK_EXCEPTION; 242 243 if ( (ph = Pgrab_core(execName_cstr, coreName_cstr)) == NULL) { 244 (*env)->ReleaseStringUTFChars(env, execName, execName_cstr); 245 (*env)->ReleaseStringUTFChars(env, coreName, coreName_cstr); 246 THROW_NEW_DEBUGGER_EXCEPTION("Can't attach to the core file"); 247 } 248 (*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph); 249 (*env)->ReleaseStringUTFChars(env, execName, execName_cstr); 250 (*env)->ReleaseStringUTFChars(env, coreName, coreName_cstr); 251 fillThreadsAndLoadObjects(env, this_obj, ph); 252 } 253 254 /* 255 * Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal 256 * Method: detach0 257 * Signature: ()V 258 */ 259 JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_detach0 260 (JNIEnv *env, jobject this_obj) { 261 struct ps_prochandle* ph = get_proc_handle(env, this_obj); 262 if (ph != NULL) { 263 Prelease(ph); 264 } 265 } 266 267 /* 268 * Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal 269 * Method: lookupByName0 270 * Signature: (Ljava/lang/String;Ljava/lang/String;)J 271 */ 272 JNIEXPORT jlong JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_lookupByName0 273 (JNIEnv *env, jobject this_obj, jstring objectName, jstring symbolName) { 274 const char *objectName_cstr, *symbolName_cstr; 275 jlong addr; 276 jboolean isCopy; 277 struct ps_prochandle* ph = get_proc_handle(env, this_obj); 278 279 objectName_cstr = NULL; 280 if (objectName != NULL) { 281 objectName_cstr = (*env)->GetStringUTFChars(env, objectName, &isCopy); 282 CHECK_EXCEPTION_(0); 283 } 284 symbolName_cstr = (*env)->GetStringUTFChars(env, symbolName, &isCopy); 285 CHECK_EXCEPTION_(0); 286 287 addr = (jlong) lookup_symbol(ph, objectName_cstr, symbolName_cstr); 288 289 if (objectName_cstr != NULL) { 290 (*env)->ReleaseStringUTFChars(env, objectName, objectName_cstr); 291 } 292 (*env)->ReleaseStringUTFChars(env, symbolName, symbolName_cstr); 293 return addr; 294 } 295 296 /* 297 * Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal 298 * Method: lookupByAddress0 299 * Signature: (J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol; 300 */ 301 JNIEXPORT jobject JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_lookupByAddress0 302 (JNIEnv *env, jobject this_obj, jlong addr) { 303 uintptr_t offset; 304 const char* sym = NULL; 305 306 struct ps_prochandle* ph = get_proc_handle(env, this_obj); 307 sym = symbol_for_pc(ph, (uintptr_t) addr, &offset); 308 if (sym == NULL) return 0; 309 return (*env)->CallObjectMethod(env, this_obj, createClosestSymbol_ID, 310 (*env)->NewStringUTF(env, sym), (jlong)offset); 311 } 312 313 /* 314 * Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal 315 * Method: readBytesFromProcess0 316 * Signature: (JJ)Lsun/jvm/hotspot/debugger/ReadResult; 317 */ 318 JNIEXPORT jbyteArray JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_readBytesFromProcess0 319 (JNIEnv *env, jobject this_obj, jlong addr, jlong numBytes) { 320 321 jboolean isCopy; 322 jbyteArray array; 323 jbyte *bufPtr; 324 ps_err_e err; 325 326 array = (*env)->NewByteArray(env, numBytes); 327 CHECK_EXCEPTION_(0); 328 bufPtr = (*env)->GetByteArrayElements(env, array, &isCopy); 329 CHECK_EXCEPTION_(0); 330 331 err = ps_pdread(get_proc_handle(env, this_obj), (psaddr_t) (uintptr_t)addr, bufPtr, numBytes); 332 (*env)->ReleaseByteArrayElements(env, array, bufPtr, 0); 333 return (err == PS_OK)? array : 0; 334 } 335 336 #if defined(i386) || defined(amd64) || defined(sparc) || defined(sparcv9) 337 JNIEXPORT jlongArray JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_getThreadIntegerRegisterSet0 338 (JNIEnv *env, jobject this_obj, jint lwp_id) { 339 340 struct user_regs_struct gregs; 341 jboolean isCopy; 342 jlongArray array; 343 jlong *regs; 344 int i; 345 346 struct ps_prochandle* ph = get_proc_handle(env, this_obj); 347 if (get_lwp_regs(ph, lwp_id, &gregs) != true) { 348 THROW_NEW_DEBUGGER_EXCEPTION_("get_thread_regs failed for a lwp", 0); 349 } 350 351 #undef NPRGREG 352 #ifdef i386 353 #define NPRGREG sun_jvm_hotspot_debugger_x86_X86ThreadContext_NPRGREG 354 #endif 355 #ifdef amd64 356 #define NPRGREG sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_NPRGREG 357 #endif 358 #if defined(sparc) || defined(sparcv9) 359 #define NPRGREG sun_jvm_hotspot_debugger_sparc_SPARCThreadContext_NPRGREG 360 #endif 361 362 array = (*env)->NewLongArray(env, NPRGREG); 363 CHECK_EXCEPTION_(0); 364 regs = (*env)->GetLongArrayElements(env, array, &isCopy); 365 366 #undef REG_INDEX 367 368 #ifdef i386 369 #define REG_INDEX(reg) sun_jvm_hotspot_debugger_x86_X86ThreadContext_##reg 370 371 regs[REG_INDEX(GS)] = (uintptr_t) gregs.xgs; 372 regs[REG_INDEX(FS)] = (uintptr_t) gregs.xfs; 373 regs[REG_INDEX(ES)] = (uintptr_t) gregs.xes; 374 regs[REG_INDEX(DS)] = (uintptr_t) gregs.xds; 375 regs[REG_INDEX(EDI)] = (uintptr_t) gregs.edi; 376 regs[REG_INDEX(ESI)] = (uintptr_t) gregs.esi; 377 regs[REG_INDEX(FP)] = (uintptr_t) gregs.ebp; 378 regs[REG_INDEX(SP)] = (uintptr_t) gregs.esp; 379 regs[REG_INDEX(EBX)] = (uintptr_t) gregs.ebx; 380 regs[REG_INDEX(EDX)] = (uintptr_t) gregs.edx; 381 regs[REG_INDEX(ECX)] = (uintptr_t) gregs.ecx; 382 regs[REG_INDEX(EAX)] = (uintptr_t) gregs.eax; 383 regs[REG_INDEX(PC)] = (uintptr_t) gregs.eip; 384 regs[REG_INDEX(CS)] = (uintptr_t) gregs.xcs; 385 regs[REG_INDEX(SS)] = (uintptr_t) gregs.xss; 386 387 #endif /* i386 */ 388 389 #ifdef amd64 390 #define REG_INDEX(reg) sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_##reg 391 392 regs[REG_INDEX(R15)] = gregs.r15; 393 regs[REG_INDEX(R14)] = gregs.r14; 394 regs[REG_INDEX(R13)] = gregs.r13; 395 regs[REG_INDEX(R12)] = gregs.r12; 396 regs[REG_INDEX(RBP)] = gregs.rbp; 397 regs[REG_INDEX(RBX)] = gregs.rbx; 398 regs[REG_INDEX(R11)] = gregs.r11; 399 regs[REG_INDEX(R10)] = gregs.r10; 400 regs[REG_INDEX(R9)] = gregs.r9; 401 regs[REG_INDEX(R8)] = gregs.r8; 402 regs[REG_INDEX(RAX)] = gregs.rax; 403 regs[REG_INDEX(RCX)] = gregs.rcx; 404 regs[REG_INDEX(RDX)] = gregs.rdx; 405 regs[REG_INDEX(RSI)] = gregs.rsi; 406 regs[REG_INDEX(RDI)] = gregs.rdi; 407 regs[REG_INDEX(RIP)] = gregs.rip; 408 regs[REG_INDEX(CS)] = gregs.cs; 409 regs[REG_INDEX(RSP)] = gregs.rsp; 410 regs[REG_INDEX(SS)] = gregs.ss; 411 regs[REG_INDEX(FSBASE)] = gregs.fs_base; 412 regs[REG_INDEX(GSBASE)] = gregs.gs_base; 413 regs[REG_INDEX(DS)] = gregs.ds; 414 regs[REG_INDEX(ES)] = gregs.es; 415 regs[REG_INDEX(FS)] = gregs.fs; 416 regs[REG_INDEX(GS)] = gregs.gs; 417 418 #endif /* amd64 */ 419 420 #if defined(sparc) || defined(sparcv9) 421 422 #define REG_INDEX(reg) sun_jvm_hotspot_debugger_sparc_SPARCThreadContext_##reg 423 424 #ifdef _LP64 425 regs[REG_INDEX(R_PSR)] = gregs.tstate; 426 regs[REG_INDEX(R_PC)] = gregs.tpc; 427 regs[REG_INDEX(R_nPC)] = gregs.tnpc; 428 regs[REG_INDEX(R_Y)] = gregs.y; 429 #else 430 regs[REG_INDEX(R_PSR)] = gregs.psr; 431 regs[REG_INDEX(R_PC)] = gregs.pc; 432 regs[REG_INDEX(R_nPC)] = gregs.npc; 433 regs[REG_INDEX(R_Y)] = gregs.y; 434 #endif 435 regs[REG_INDEX(R_G0)] = 0 ; 436 regs[REG_INDEX(R_G1)] = gregs.u_regs[0]; 437 regs[REG_INDEX(R_G2)] = gregs.u_regs[1]; 438 regs[REG_INDEX(R_G3)] = gregs.u_regs[2]; 439 regs[REG_INDEX(R_G4)] = gregs.u_regs[3]; 440 regs[REG_INDEX(R_G5)] = gregs.u_regs[4]; 441 regs[REG_INDEX(R_G6)] = gregs.u_regs[5]; 442 regs[REG_INDEX(R_G7)] = gregs.u_regs[6]; 443 regs[REG_INDEX(R_O0)] = gregs.u_regs[7]; 444 regs[REG_INDEX(R_O1)] = gregs.u_regs[8]; 445 regs[REG_INDEX(R_O2)] = gregs.u_regs[ 9]; 446 regs[REG_INDEX(R_O3)] = gregs.u_regs[10]; 447 regs[REG_INDEX(R_O4)] = gregs.u_regs[11]; 448 regs[REG_INDEX(R_O5)] = gregs.u_regs[12]; 449 regs[REG_INDEX(R_O6)] = gregs.u_regs[13]; 450 regs[REG_INDEX(R_O7)] = gregs.u_regs[14]; 451 #endif /* sparc */ 452 453 454 (*env)->ReleaseLongArrayElements(env, array, regs, JNI_COMMIT); 455 return array; 456 } 457 #endif