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/*
* Copyright (c) 2002, 2013, 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.
*
*/
#include <jni.h>
#include "libproc.h"
#include <elf.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#if defined(x86_64) && !defined(amd64)
#define amd64 1
#endif
#ifdef i386
#include "sun_jvm_hotspot_debugger_x86_X86ThreadContext.h"
#endif
#ifdef amd64
#include "sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext.h"
#endif
#if defined(sparc) || defined(sparcv9)
#include "sun_jvm_hotspot_debugger_sparc_SPARCThreadContext.h"
#endif
static jfieldID p_ps_prochandle_ID = 0;
static jfieldID threadList_ID = 0;
static jfieldID loadObjectList_ID = 0;
static jmethodID createClosestSymbol_ID = 0;
static jmethodID createLoadObject_ID = 0;
static jmethodID getThreadForThreadId_ID = 0;
static jmethodID listAdd_ID = 0;
#define CHECK_EXCEPTION_(value) if ((*env)->ExceptionOccurred(env)) { return value; }
#define CHECK_EXCEPTION if ((*env)->ExceptionOccurred(env)) { return;}
#define THROW_NEW_DEBUGGER_EXCEPTION_(str, value) { throw_new_debugger_exception(env, str); return value; }
#define THROW_NEW_DEBUGGER_EXCEPTION(str) { throw_new_debugger_exception(env, str); return;}
void throw_new_debugger_exception(JNIEnv* env, const char* errMsg) {
(*env)->ThrowNew(env, (*env)->FindClass(env, "sun/jvm/hotspot/debugger/DebuggerException"), errMsg);
}
struct ps_prochandle* get_proc_handle(JNIEnv* env, jobject this_obj) {
jlong ptr = (*env)->GetLongField(env, this_obj, p_ps_prochandle_ID);
return (struct ps_prochandle*)(intptr_t)ptr;
}
/*
* Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
* Method: init0
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_init0
(JNIEnv *env, jclass cls) {
jclass listClass;
if (init_libproc(getenv("LIBSAPROC_DEBUG") != NULL) != true) {
THROW_NEW_DEBUGGER_EXCEPTION("can't initialize libproc");
}
// fields we use
p_ps_prochandle_ID = (*env)->GetFieldID(env, cls, "p_ps_prochandle", "J");
CHECK_EXCEPTION;
threadList_ID = (*env)->GetFieldID(env, cls, "threadList", "Ljava/util/List;");
CHECK_EXCEPTION;
loadObjectList_ID = (*env)->GetFieldID(env, cls, "loadObjectList", "Ljava/util/List;");
CHECK_EXCEPTION;
// methods we use
createClosestSymbol_ID = (*env)->GetMethodID(env, cls, "createClosestSymbol",
"(Ljava/lang/String;J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol;");
CHECK_EXCEPTION;
createLoadObject_ID = (*env)->GetMethodID(env, cls, "createLoadObject",
"(Ljava/lang/String;JJ)Lsun/jvm/hotspot/debugger/cdbg/LoadObject;");
CHECK_EXCEPTION;
getThreadForThreadId_ID = (*env)->GetMethodID(env, cls, "getThreadForThreadId",
"(J)Lsun/jvm/hotspot/debugger/ThreadProxy;");
CHECK_EXCEPTION;
// java.util.List method we call
listClass = (*env)->FindClass(env, "java/util/List");
CHECK_EXCEPTION;
listAdd_ID = (*env)->GetMethodID(env, listClass, "add", "(Ljava/lang/Object;)Z");
CHECK_EXCEPTION;
}
JNIEXPORT jint JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_getAddressSize
(JNIEnv *env, jclass cls)
{
#ifdef _LP64
return 8;
#else
return 4;
#endif
}
static void fillThreadsAndLoadObjects(JNIEnv* env, jobject this_obj, struct ps_prochandle* ph) {
int n = 0, i = 0;
// add threads
n = get_num_threads(ph);
for (i = 0; i < n; i++) {
jobject thread;
jobject threadList;
lwpid_t lwpid;
lwpid = get_lwp_id(ph, i);
thread = (*env)->CallObjectMethod(env, this_obj, getThreadForThreadId_ID,
(jlong)lwpid);
CHECK_EXCEPTION;
threadList = (*env)->GetObjectField(env, this_obj, threadList_ID);
CHECK_EXCEPTION;
(*env)->CallBooleanMethod(env, threadList, listAdd_ID, thread);
CHECK_EXCEPTION;
}
// add load objects
n = get_num_libs(ph);
for (i = 0; i < n; i++) {
uintptr_t base;
const char* name;
jobject loadObject;
jobject loadObjectList;
base = get_lib_base(ph, i);
name = get_lib_name(ph, i);
loadObject = (*env)->CallObjectMethod(env, this_obj, createLoadObject_ID,
(*env)->NewStringUTF(env, name), (jlong)0, (jlong)base);
CHECK_EXCEPTION;
loadObjectList = (*env)->GetObjectField(env, this_obj, loadObjectList_ID);
CHECK_EXCEPTION;
(*env)->CallBooleanMethod(env, loadObjectList, listAdd_ID, loadObject);
CHECK_EXCEPTION;
}
}
/*
* Verify that a named ELF binary file (core or executable) has the same
* bitness as ourselves.
* Throw an exception if there is a mismatch or other problem.
*
* If we proceed using a mismatched debugger/debuggee, the best to hope
* for is a missing symbol, the worst is a crash searching for debug symbols.
*/
void verifyBitness(JNIEnv *env, const char *binaryName) {
int fd = open(binaryName, O_RDONLY);
if (fd < 0) {
THROW_NEW_DEBUGGER_EXCEPTION("cannot open binary file");
}
unsigned char elf_ident[EI_NIDENT];
int i = read(fd, &elf_ident, sizeof(elf_ident));
close(fd);
if (i < 0) {
THROW_NEW_DEBUGGER_EXCEPTION("cannot read binary file");
}
#ifndef _LP64
if (elf_ident[EI_CLASS] == ELFCLASS64) {
THROW_NEW_DEBUGGER_EXCEPTION("debuggee is 64 bit, use 64-bit java for debugger");
}
#else
if (elf_ident[EI_CLASS] != ELFCLASS64) {
THROW_NEW_DEBUGGER_EXCEPTION("debuggee is 32 bit, use 32 bit java for debugger");
}
#endif
}
/*
* Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
* Method: attach0
* Signature: (I)V
*/
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_attach0__I
(JNIEnv *env, jobject this_obj, jint jpid) {
// For bitness checking, locate binary at /proc/jpid/exe
char buf[PATH_MAX];
snprintf((char *) &buf, PATH_MAX, "/proc/%d/exe", jpid);
verifyBitness(env, (char *) &buf);
CHECK_EXCEPTION;
struct ps_prochandle* ph;
if ( (ph = Pgrab(jpid)) == NULL) {
THROW_NEW_DEBUGGER_EXCEPTION("Can't attach to the process");
}
(*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph);
fillThreadsAndLoadObjects(env, this_obj, ph);
}
/*
* Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
* Method: attach0
* Signature: (Ljava/lang/String;Ljava/lang/String;)V
*/
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_attach0__Ljava_lang_String_2Ljava_lang_String_2
(JNIEnv *env, jobject this_obj, jstring execName, jstring coreName) {
const char *execName_cstr;
const char *coreName_cstr;
jboolean isCopy;
struct ps_prochandle* ph;
execName_cstr = (*env)->GetStringUTFChars(env, execName, &isCopy);
CHECK_EXCEPTION;
coreName_cstr = (*env)->GetStringUTFChars(env, coreName, &isCopy);
CHECK_EXCEPTION;
verifyBitness(env, execName_cstr);
CHECK_EXCEPTION;
if ( (ph = Pgrab_core(execName_cstr, coreName_cstr)) == NULL) {
(*env)->ReleaseStringUTFChars(env, execName, execName_cstr);
(*env)->ReleaseStringUTFChars(env, coreName, coreName_cstr);
THROW_NEW_DEBUGGER_EXCEPTION("Can't attach to the core file");
}
(*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph);
(*env)->ReleaseStringUTFChars(env, execName, execName_cstr);
(*env)->ReleaseStringUTFChars(env, coreName, coreName_cstr);
fillThreadsAndLoadObjects(env, this_obj, ph);
}
/*
* Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
* Method: detach0
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_detach0
(JNIEnv *env, jobject this_obj) {
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
if (ph != NULL) {
Prelease(ph);
}
}
/*
* Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
* Method: lookupByName0
* Signature: (Ljava/lang/String;Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_lookupByName0
(JNIEnv *env, jobject this_obj, jstring objectName, jstring symbolName) {
const char *objectName_cstr, *symbolName_cstr;
jlong addr;
jboolean isCopy;
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
objectName_cstr = NULL;
if (objectName != NULL) {
objectName_cstr = (*env)->GetStringUTFChars(env, objectName, &isCopy);
CHECK_EXCEPTION_(0);
}
symbolName_cstr = (*env)->GetStringUTFChars(env, symbolName, &isCopy);
CHECK_EXCEPTION_(0);
addr = (jlong) lookup_symbol(ph, objectName_cstr, symbolName_cstr);
if (objectName_cstr != NULL) {
(*env)->ReleaseStringUTFChars(env, objectName, objectName_cstr);
}
(*env)->ReleaseStringUTFChars(env, symbolName, symbolName_cstr);
return addr;
}
/*
* Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
* Method: lookupByAddress0
* Signature: (J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol;
*/
JNIEXPORT jobject JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_lookupByAddress0
(JNIEnv *env, jobject this_obj, jlong addr) {
uintptr_t offset;
const char* sym = NULL;
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
sym = symbol_for_pc(ph, (uintptr_t) addr, &offset);
if (sym == NULL) return 0;
return (*env)->CallObjectMethod(env, this_obj, createClosestSymbol_ID,
(*env)->NewStringUTF(env, sym), (jlong)offset);
}
/*
* Class: sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal
* Method: readBytesFromProcess0
* Signature: (JJ)Lsun/jvm/hotspot/debugger/ReadResult;
*/
JNIEXPORT jbyteArray JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_readBytesFromProcess0
(JNIEnv *env, jobject this_obj, jlong addr, jlong numBytes) {
jboolean isCopy;
jbyteArray array;
jbyte *bufPtr;
ps_err_e err;
array = (*env)->NewByteArray(env, numBytes);
CHECK_EXCEPTION_(0);
bufPtr = (*env)->GetByteArrayElements(env, array, &isCopy);
CHECK_EXCEPTION_(0);
err = ps_pdread(get_proc_handle(env, this_obj), (psaddr_t) (uintptr_t)addr, bufPtr, numBytes);
(*env)->ReleaseByteArrayElements(env, array, bufPtr, 0);
return (err == PS_OK)? array : 0;
}
#if defined(i386) || defined(amd64) || defined(sparc) || defined(sparcv9) || defined(aarch64)
JNIEXPORT jlongArray JNICALL Java_sun_jvm_hotspot_debugger_linux_LinuxDebuggerLocal_getThreadIntegerRegisterSet0
(JNIEnv *env, jobject this_obj, jint lwp_id) {
struct user_regs_struct gregs;
jboolean isCopy;
jlongArray array;
jlong *regs;
int i;
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
if (get_lwp_regs(ph, lwp_id, &gregs) != true) {
THROW_NEW_DEBUGGER_EXCEPTION_("get_thread_regs failed for a lwp", 0);
}
#undef NPRGREG
#ifdef i386
#define NPRGREG sun_jvm_hotspot_debugger_x86_X86ThreadContext_NPRGREG
#endif
#ifdef amd64
#define NPRGREG sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_NPRGREG
#endif
#ifdef aarch64
#define NPRGREG 32
#endif
#if defined(sparc) || defined(sparcv9)
#define NPRGREG sun_jvm_hotspot_debugger_sparc_SPARCThreadContext_NPRGREG
#endif
array = (*env)->NewLongArray(env, NPRGREG);
CHECK_EXCEPTION_(0);
regs = (*env)->GetLongArrayElements(env, array, &isCopy);
#undef REG_INDEX
#ifdef i386
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_x86_X86ThreadContext_##reg
regs[REG_INDEX(GS)] = (uintptr_t) gregs.xgs;
regs[REG_INDEX(FS)] = (uintptr_t) gregs.xfs;
regs[REG_INDEX(ES)] = (uintptr_t) gregs.xes;
regs[REG_INDEX(DS)] = (uintptr_t) gregs.xds;
regs[REG_INDEX(EDI)] = (uintptr_t) gregs.edi;
regs[REG_INDEX(ESI)] = (uintptr_t) gregs.esi;
regs[REG_INDEX(FP)] = (uintptr_t) gregs.ebp;
regs[REG_INDEX(SP)] = (uintptr_t) gregs.esp;
regs[REG_INDEX(EBX)] = (uintptr_t) gregs.ebx;
regs[REG_INDEX(EDX)] = (uintptr_t) gregs.edx;
regs[REG_INDEX(ECX)] = (uintptr_t) gregs.ecx;
regs[REG_INDEX(EAX)] = (uintptr_t) gregs.eax;
regs[REG_INDEX(PC)] = (uintptr_t) gregs.eip;
regs[REG_INDEX(CS)] = (uintptr_t) gregs.xcs;
regs[REG_INDEX(SS)] = (uintptr_t) gregs.xss;
#endif /* i386 */
#ifdef amd64
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_##reg
regs[REG_INDEX(R15)] = gregs.r15;
regs[REG_INDEX(R14)] = gregs.r14;
regs[REG_INDEX(R13)] = gregs.r13;
regs[REG_INDEX(R12)] = gregs.r12;
regs[REG_INDEX(RBP)] = gregs.rbp;
regs[REG_INDEX(RBX)] = gregs.rbx;
regs[REG_INDEX(R11)] = gregs.r11;
regs[REG_INDEX(R10)] = gregs.r10;
regs[REG_INDEX(R9)] = gregs.r9;
regs[REG_INDEX(R8)] = gregs.r8;
regs[REG_INDEX(RAX)] = gregs.rax;
regs[REG_INDEX(RCX)] = gregs.rcx;
regs[REG_INDEX(RDX)] = gregs.rdx;
regs[REG_INDEX(RSI)] = gregs.rsi;
regs[REG_INDEX(RDI)] = gregs.rdi;
regs[REG_INDEX(RIP)] = gregs.rip;
regs[REG_INDEX(CS)] = gregs.cs;
regs[REG_INDEX(RSP)] = gregs.rsp;
regs[REG_INDEX(SS)] = gregs.ss;
regs[REG_INDEX(FSBASE)] = gregs.fs_base;
regs[REG_INDEX(GSBASE)] = gregs.gs_base;
regs[REG_INDEX(DS)] = gregs.ds;
regs[REG_INDEX(ES)] = gregs.es;
regs[REG_INDEX(FS)] = gregs.fs;
regs[REG_INDEX(GS)] = gregs.gs;
#endif /* amd64 */
#if defined(sparc) || defined(sparcv9)
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_sparc_SPARCThreadContext_##reg
#ifdef _LP64
regs[REG_INDEX(R_PSR)] = gregs.tstate;
regs[REG_INDEX(R_PC)] = gregs.tpc;
regs[REG_INDEX(R_nPC)] = gregs.tnpc;
regs[REG_INDEX(R_Y)] = gregs.y;
#else
regs[REG_INDEX(R_PSR)] = gregs.psr;
regs[REG_INDEX(R_PC)] = gregs.pc;
regs[REG_INDEX(R_nPC)] = gregs.npc;
regs[REG_INDEX(R_Y)] = gregs.y;
#endif
regs[REG_INDEX(R_G0)] = 0 ;
regs[REG_INDEX(R_G1)] = gregs.u_regs[0];
regs[REG_INDEX(R_G2)] = gregs.u_regs[1];
regs[REG_INDEX(R_G3)] = gregs.u_regs[2];
regs[REG_INDEX(R_G4)] = gregs.u_regs[3];
regs[REG_INDEX(R_G5)] = gregs.u_regs[4];
regs[REG_INDEX(R_G6)] = gregs.u_regs[5];
regs[REG_INDEX(R_G7)] = gregs.u_regs[6];
regs[REG_INDEX(R_O0)] = gregs.u_regs[7];
regs[REG_INDEX(R_O1)] = gregs.u_regs[8];
regs[REG_INDEX(R_O2)] = gregs.u_regs[ 9];
regs[REG_INDEX(R_O3)] = gregs.u_regs[10];
regs[REG_INDEX(R_O4)] = gregs.u_regs[11];
regs[REG_INDEX(R_O5)] = gregs.u_regs[12];
regs[REG_INDEX(R_O6)] = gregs.u_regs[13];
regs[REG_INDEX(R_O7)] = gregs.u_regs[14];
#endif /* sparc */
#if defined(aarch64)
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_aarch64_AARCH64ThreadContext_##reg
#endif /* aarch64 */
(*env)->ReleaseLongArrayElements(env, array, regs, JNI_COMMIT);
return array;
}
#endif
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