Java example source code file (MacosxDebuggerLocal.m)
The MacosxDebuggerLocal.m Java example source code/*
* 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 <objc/objc-runtime.h>
#import <Foundation/Foundation.h>
#import <JavaNativeFoundation/JavaNativeFoundation.h>
#include <JavaVM/jni.h>
#import <mach/mach.h>
#import <mach/mach_types.h>
#import <sys/sysctl.h>
#import <stdio.h>
#import <stdarg.h>
#import <stdlib.h>
#import <strings.h>
#import <dlfcn.h>
#import <limits.h>
#import <errno.h>
#import <sys/types.h>
#import <sys/ptrace.h>
#include "libproc_impl.h"
#define UNSUPPORTED_ARCH "Unsupported architecture!"
#if defined(x86_64) && !defined(amd64)
#define amd64 1
#endif
#if amd64
#include "sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext.h"
#else
#error UNSUPPORTED_ARCH
#endif
static jfieldID symbolicatorID = 0; // set in _init0
static jfieldID taskID = 0; // set in _init0
static jfieldID p_ps_prochandle_ID = 0;
static jfieldID loadObjectList_ID = 0;
static jmethodID listAdd_ID = 0;
static jmethodID createClosestSymbol_ID = 0;
static jmethodID createLoadObject_ID = 0;
static jmethodID getJavaThreadsInfo_ID = 0;
// indicator if thread id (lwpid_t) was set
static bool _threads_filled = false;
static void putSymbolicator(JNIEnv *env, jobject this_obj, id symbolicator) {
(*env)->SetLongField(env, this_obj, symbolicatorID, (jlong)(intptr_t)symbolicator);
}
static id getSymbolicator(JNIEnv *env, jobject this_obj) {
jlong ptr = (*env)->GetLongField(env, this_obj, symbolicatorID);
return (id)(intptr_t)ptr;
}
static void putTask(JNIEnv *env, jobject this_obj, task_t task) {
(*env)->SetLongField(env, this_obj, taskID, (jlong)task);
}
static task_t getTask(JNIEnv *env, jobject this_obj) {
jlong ptr = (*env)->GetLongField(env, this_obj, taskID);
return (task_t)ptr;
}
#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;}
#define CHECK_EXCEPTION_CLEAR if ((*env)->ExceptionOccurred(env)) { (*env)->ExceptionClear(env); }
#define CHECK_EXCEPTION_CLEAR_VOID if ((*env)->ExceptionOccurred(env)) { (*env)->ExceptionClear(env); return; }
#define CHECK_EXCEPTION_CLEAR_(value) if ((*env)->ExceptionOccurred(env)) { (*env)->ExceptionClear(env); return value; }
static void throw_new_debugger_exception(JNIEnv* env, const char* errMsg) {
(*env)->ThrowNew(env, (*env)->FindClass(env, "sun/jvm/hotspot/debugger/DebuggerException"), errMsg);
}
static 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;
}
#if defined(__i386__)
#define hsdb_thread_state_t x86_thread_state32_t
#define hsdb_float_state_t x86_float_state32_t
#define HSDB_THREAD_STATE x86_THREAD_STATE32
#define HSDB_FLOAT_STATE x86_FLOAT_STATE32
#define HSDB_THREAD_STATE_COUNT x86_THREAD_STATE32_COUNT
#define HSDB_FLOAT_STATE_COUNT x86_FLOAT_STATE32_COUNT
#elif defined(__x86_64__)
#define hsdb_thread_state_t x86_thread_state64_t
#define hsdb_float_state_t x86_float_state64_t
#define HSDB_THREAD_STATE x86_THREAD_STATE64
#define HSDB_FLOAT_STATE x86_FLOAT_STATE64
#define HSDB_THREAD_STATE_COUNT x86_THREAD_STATE64_COUNT
#define HSDB_FLOAT_STATE_COUNT x86_FLOAT_STATE64_COUNT
#else
#error UNSUPPORTED_ARCH
#endif
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: init0
* Signature: ()V
*/
JNIEXPORT void JNICALL
Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_init0(JNIEnv *env, jclass cls) {
symbolicatorID = (*env)->GetFieldID(env, cls, "symbolicator", "J");
taskID = (*env)->GetFieldID(env, cls, "task", "J");
CHECK_EXCEPTION;
// for core file
p_ps_prochandle_ID = (*env)->GetFieldID(env, cls, "p_ps_prochandle", "J");
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;
// java.util.List method we call
jclass listClass = (*env)->FindClass(env, "java/util/List");
CHECK_EXCEPTION;
listAdd_ID = (*env)->GetMethodID(env, listClass, "add", "(Ljava/lang/Object;)Z");
CHECK_EXCEPTION;
getJavaThreadsInfo_ID = (*env)->GetMethodID(env, cls, "getJavaThreadsInfo",
"()[J");
CHECK_EXCEPTION;
init_libproc(getenv("LIBSAPROC_DEBUG") != NULL);
}
JNIEXPORT jint JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_getAddressSize
(JNIEnv *env, jclass cls)
{
#ifdef _LP64
return 8;
#else
#error UNSUPPORTED_ARCH
#endif
}
/** called by Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_lookupByName0 */
jlong lookupByNameIncore(
JNIEnv *env, struct ps_prochandle *ph, jobject this_obj, jstring objectName, jstring symbolName)
{
const char *objectName_cstr, *symbolName_cstr;
jlong addr;
jboolean isCopy;
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);
print_debug("look for %s \n", symbolName_cstr);
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_bsd_BsdDebuggerLocal
* Method: lookupByName0
* Signature: (Ljava/lang/String;Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL
Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_lookupByName0(
JNIEnv *env, jobject this_obj,
jstring objectName, jstring symbolName)
{
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
if (ph != NULL && ph->core != NULL) {
return lookupByNameIncore(env, ph, this_obj, objectName, symbolName);
}
jlong address = 0;
JNF_COCOA_ENTER(env);
NSString *symbolNameString = JNFJavaToNSString(env, symbolName);
print_debug("lookupInProcess called for %s\n", [symbolNameString UTF8String]);
id symbolicator = getSymbolicator(env, this_obj);
if (symbolicator != nil) {
uint64_t (*dynamicCall)(id, SEL, NSString *) = (uint64_t (*)(id, SEL, NSString *))&objc_msgSend;
address = (jlong) dynamicCall(symbolicator, @selector(addressForSymbol:), symbolNameString);
}
print_debug("address of symbol %s = %llx\n", [symbolNameString UTF8String], address);
JNF_COCOA_EXIT(env);
return address;
}
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: lookupByAddress0
* Signature: (J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol;
*/
JNIEXPORT jobject JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_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);
if (ph != NULL && ph->core != NULL) {
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);
}
return 0;
}
/** called from Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_readBytesFromProcess0 */
jbyteArray readBytesFromCore(
JNIEnv *env, struct ps_prochandle *ph, 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_pread(ph, (psaddr_t) (uintptr_t)addr, bufPtr, numBytes);
(*env)->ReleaseByteArrayElements(env, array, bufPtr, 0);
return (err == PS_OK)? array : 0;
}
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: readBytesFromProcess0
* Signature: (JJ)Lsun/jvm/hotspot/debugger/ReadResult;
*/
JNIEXPORT jbyteArray JNICALL
Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_readBytesFromProcess0(
JNIEnv *env, jobject this_obj,
jlong addr, jlong numBytes)
{
print_debug("readBytesFromProcess called. addr = %llx numBytes = %lld\n", addr, numBytes);
// must allocate storage instead of using former parameter buf
jbyteArray array;
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
if (ph != NULL && ph->core != NULL) {
return readBytesFromCore(env, ph, this_obj, addr, numBytes);
}
array = (*env)->NewByteArray(env, numBytes);
CHECK_EXCEPTION_(0);
unsigned long alignedAddress;
unsigned long alignedLength = 0;
kern_return_t result;
vm_offset_t *pages;
int *mapped;
long pageCount;
uint byteCount;
int i;
unsigned long remaining;
alignedAddress = trunc_page(addr);
if (addr != alignedAddress) {
alignedLength += addr - alignedAddress;
}
alignedLength = round_page(numBytes);
pageCount = alignedLength/vm_page_size;
// Allocate storage for pages and flags.
pages = malloc(pageCount * sizeof(vm_offset_t));
mapped = calloc(pageCount, sizeof(int));
task_t gTask = getTask(env, this_obj);
// Try to read each of the pages.
for (i = 0; i < pageCount; i++) {
result = vm_read(gTask, alignedAddress + i*vm_page_size, vm_page_size,
&pages[i], &byteCount);
mapped[i] = (result == KERN_SUCCESS);
// assume all failures are unmapped pages
}
print_debug("%ld pages\n", pageCount);
remaining = numBytes;
for (i = 0; i < pageCount; i++) {
unsigned long len = vm_page_size;
unsigned long start = 0;
if (i == 0) {
start = addr - alignedAddress;
len = vm_page_size - start;
}
if (i == (pageCount - 1)) {
len = remaining;
}
if (mapped[i]) {
print_debug("page %d mapped (len %ld start %ld)\n", i, len, start);
(*env)->SetByteArrayRegion(env, array, 0, len, ((jbyte *) pages[i] + start));
vm_deallocate(mach_task_self(), pages[i], vm_page_size);
}
remaining -= len;
}
free (pages);
free (mapped);
return array;
}
/** Only used for core file reading, set thread_id for threads which is got after core file parsed.
* Thread context is available in Mach-O core file but thread id is not. We can get thread id
* from Threads which store all java threads information when they are created. Here we can identify
* them as java threads by checking if a thread's rsp or rbp within a java thread's stack.
* Note Macosx uses unique_thread_id which is different from other platforms though printed ids
* are still pthread id. Function BsdDebuggerLocal.getJavaThreadsInfo returns an array of long
* integers to host all java threads' id, stack_start, stack_end as:
* [uid0, stack_start0, stack_end0, uid1, stack_start1, stack_end1, ...]
*
* The work cannot be done at init0 since Threads is not available yet(VM not initialized yet).
* This function should be called only once if succeeded
*/
bool fill_java_threads(JNIEnv* env, jobject this_obj, struct ps_prochandle* ph) {
int n = 0, i = 0, j;
struct reg regs;
jlongArray thrinfos = (*env)->CallObjectMethod(env, this_obj, getJavaThreadsInfo_ID);
CHECK_EXCEPTION_(false);
int len = (int)(*env)->GetArrayLength(env, thrinfos);
uint64_t* cinfos = (uint64_t *)(*env)->GetLongArrayElements(env, thrinfos, NULL);
CHECK_EXCEPTION_(false);
n = get_num_threads(ph);
print_debug("fill_java_threads called, num_of_thread = %d\n", n);
for (i = 0; i < n; i++) {
if (!get_nth_lwp_regs(ph, i, Žs)) {
print_debug("Could not get regs of thread %d, already set!\n", i);
return false;
}
for (j = 0; j < len; j += 3) {
lwpid_t uid = cinfos[j];
uint64_t beg = cinfos[j + 1];
uint64_t end = cinfos[j + 2];
if ((regs.r_rsp < end && regs.r_rsp >= beg) ||
(regs.r_rbp < end && regs.r_rbp >= beg)) {
set_lwp_id(ph, i, uid);
break;
}
}
}
(*env)->ReleaseLongArrayElements(env, thrinfos, (jlong*)cinfos, 0);
CHECK_EXCEPTION_(false);
return true;
}
/* For core file only, called from
* Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_getThreadIntegerRegisterSet0
*/
jlongArray getThreadIntegerRegisterSetFromCore(JNIEnv *env, jobject this_obj, long lwp_id, struct ps_prochandle* ph) {
if (!_threads_filled) {
if (!fill_java_threads(env, this_obj, ph)) {
throw_new_debugger_exception(env, "Failed to fill in threads");
return 0;
} else {
_threads_filled = true;
}
}
struct reg gregs;
jboolean isCopy;
jlongArray array;
jlong *regs;
if (get_lwp_regs(ph, lwp_id, &gregs) != true) {
THROW_NEW_DEBUGGER_EXCEPTION_("get_thread_regs failed for a lwp", 0);
}
#undef NPRGREG
#undef REG_INDEX
#if amd64
#define NPRGREG sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_NPRGREG
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_##reg
array = (*env)->NewLongArray(env, NPRGREG);
CHECK_EXCEPTION_(0);
regs = (*env)->GetLongArrayElements(env, array, &isCopy);
regs[REG_INDEX(R15)] = gregs.r_r15;
regs[REG_INDEX(R14)] = gregs.r_r14;
regs[REG_INDEX(R13)] = gregs.r_r13;
regs[REG_INDEX(R12)] = gregs.r_r12;
regs[REG_INDEX(RBP)] = gregs.r_rbp;
regs[REG_INDEX(RBX)] = gregs.r_rbx;
regs[REG_INDEX(R11)] = gregs.r_r11;
regs[REG_INDEX(R10)] = gregs.r_r10;
regs[REG_INDEX(R9)] = gregs.r_r9;
regs[REG_INDEX(R8)] = gregs.r_r8;
regs[REG_INDEX(RAX)] = gregs.r_rax;
regs[REG_INDEX(RCX)] = gregs.r_rcx;
regs[REG_INDEX(RDX)] = gregs.r_rdx;
regs[REG_INDEX(RSI)] = gregs.r_rsi;
regs[REG_INDEX(RDI)] = gregs.r_rdi;
regs[REG_INDEX(RIP)] = gregs.r_rip;
regs[REG_INDEX(CS)] = gregs.r_cs;
regs[REG_INDEX(RSP)] = gregs.r_rsp;
regs[REG_INDEX(SS)] = gregs.r_ss;
regs[REG_INDEX(FSBASE)] = 0;
regs[REG_INDEX(GSBASE)] = 0;
regs[REG_INDEX(DS)] = gregs.r_ds;
regs[REG_INDEX(ES)] = gregs.r_es;
regs[REG_INDEX(FS)] = gregs.r_fs;
regs[REG_INDEX(GS)] = gregs.r_gs;
regs[REG_INDEX(TRAPNO)] = gregs.r_trapno;
regs[REG_INDEX(RFL)] = gregs.r_rflags;
#endif /* amd64 */
(*env)->ReleaseLongArrayElements(env, array, regs, JNI_COMMIT);
return array;
}
/*
* Lookup the thread_t that corresponds to the given thread_id.
* The thread_id should be the result from calling thread_info() with THREAD_IDENTIFIER_INFO
* and reading the m_ident_info.thread_id returned.
* The returned thread_t is the mach send right to the kernel port for the corresponding thread.
*
* We cannot simply use the OSThread._thread_id field in the JVM. This is set to ::mach_thread_self()
* in the VM, but that thread port is not valid for a remote debugger to access the thread.
*/
thread_t
lookupThreadFromThreadId(task_t task, jlong thread_id) {
print_debug("lookupThreadFromThreadId thread_id=0x%llx\n", thread_id);
thread_array_t thread_list = NULL;
mach_msg_type_number_t thread_list_count = 0;
thread_t result_thread = 0;
int i;
// get the list of all the send rights
kern_return_t result = task_threads(task, &thread_list, &thread_list_count);
if (result != KERN_SUCCESS) {
print_debug("task_threads returned 0x%x\n", result);
return 0;
}
for(i = 0 ; i < thread_list_count; i++) {
thread_identifier_info_data_t m_ident_info;
mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
// get the THREAD_IDENTIFIER_INFO for the send right
result = thread_info(thread_list[i], THREAD_IDENTIFIER_INFO, (thread_info_t) &m_ident_info, &count);
if (result != KERN_SUCCESS) {
print_debug("thread_info returned 0x%x\n", result);
break;
}
// if this is the one we're looking for, return the send right
if (thread_id == m_ident_info.thread_id)
{
result_thread = thread_list[i];
break;
}
}
vm_size_t thread_list_size = (vm_size_t) (thread_list_count * sizeof (thread_t));
vm_deallocate(mach_task_self(), (vm_address_t) thread_list, thread_list_count);
return result_thread;
}
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: getThreadIntegerRegisterSet0
* Signature: (J)[J
*/
JNIEXPORT jlongArray JNICALL
Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_getThreadIntegerRegisterSet0(
JNIEnv *env, jobject this_obj,
jlong thread_id)
{
print_debug("getThreadRegisterSet0 called\n");
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
if (ph != NULL && ph->core != NULL) {
return getThreadIntegerRegisterSetFromCore(env, this_obj, thread_id, ph);
}
kern_return_t result;
thread_t tid;
mach_msg_type_number_t count = HSDB_THREAD_STATE_COUNT;
hsdb_thread_state_t state;
jlongArray registerArray;
jlong *primitiveArray;
task_t gTask = getTask(env, this_obj);
tid = lookupThreadFromThreadId(gTask, thread_id);
result = thread_get_state(tid, HSDB_THREAD_STATE, (thread_state_t)&state, &count);
if (result != KERN_SUCCESS) {
print_error("getregs: thread_get_state(%d) failed (%d)\n", tid, result);
return NULL;
}
#if amd64
#define NPRGREG sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_NPRGREG
#undef REG_INDEX
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_##reg
// 64 bit
print_debug("Getting threads for a 64-bit process\n");
registerArray = (*env)->NewLongArray(env, NPRGREG);
CHECK_EXCEPTION_(0);
primitiveArray = (*env)->GetLongArrayElements(env, registerArray, NULL);
primitiveArray[REG_INDEX(R15)] = state.__r15;
primitiveArray[REG_INDEX(R14)] = state.__r14;
primitiveArray[REG_INDEX(R13)] = state.__r13;
primitiveArray[REG_INDEX(R12)] = state.__r12;
primitiveArray[REG_INDEX(R11)] = state.__r11;
primitiveArray[REG_INDEX(R10)] = state.__r10;
primitiveArray[REG_INDEX(R9)] = state.__r9;
primitiveArray[REG_INDEX(R8)] = state.__r8;
primitiveArray[REG_INDEX(RDI)] = state.__rdi;
primitiveArray[REG_INDEX(RSI)] = state.__rsi;
primitiveArray[REG_INDEX(RBP)] = state.__rbp;
primitiveArray[REG_INDEX(RBX)] = state.__rbx;
primitiveArray[REG_INDEX(RDX)] = state.__rdx;
primitiveArray[REG_INDEX(RCX)] = state.__rcx;
primitiveArray[REG_INDEX(RAX)] = state.__rax;
primitiveArray[REG_INDEX(TRAPNO)] = 0; // trapno, not used
primitiveArray[REG_INDEX(ERR)] = 0; // err, not used
primitiveArray[REG_INDEX(RIP)] = state.__rip;
primitiveArray[REG_INDEX(CS)] = state.__cs;
primitiveArray[REG_INDEX(RFL)] = state.__rflags;
primitiveArray[REG_INDEX(RSP)] = state.__rsp;
primitiveArray[REG_INDEX(SS)] = 0; // We don't have SS
primitiveArray[REG_INDEX(FS)] = state.__fs;
primitiveArray[REG_INDEX(GS)] = state.__gs;
primitiveArray[REG_INDEX(ES)] = 0;
primitiveArray[REG_INDEX(DS)] = 0;
primitiveArray[REG_INDEX(FSBASE)] = 0;
primitiveArray[REG_INDEX(GSBASE)] = 0;
print_debug("set registers\n");
(*env)->ReleaseLongArrayElements(env, registerArray, primitiveArray, 0);
#else
#error UNSUPPORTED_ARCH
#endif /* amd64 */
return registerArray;
}
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: translateTID0
* Signature: (I)I
*/
JNIEXPORT jint JNICALL
Java_sun_jvm_hotspot_debugger_macosx_MacOSXDebuggerLocal_translateTID0(
JNIEnv *env, jobject this_obj, jint tid)
{
print_debug("translateTID0 called on tid = 0x%x\n", (int)tid);
kern_return_t result;
thread_t foreign_tid, usable_tid;
mach_msg_type_name_t type;
foreign_tid = tid;
task_t gTask = getTask(env, this_obj);
result = mach_port_extract_right(gTask, foreign_tid,
MACH_MSG_TYPE_COPY_SEND,
&usable_tid, &type);
if (result != KERN_SUCCESS)
return -1;
print_debug("translateTID0: 0x%x -> 0x%x\n", foreign_tid, usable_tid);
return (jint) usable_tid;
}
static bool ptrace_continue(pid_t pid, int signal) {
// pass the signal to the process so we don't swallow it
int res;
if ((res = ptrace(PT_CONTINUE, pid, (caddr_t)1, signal)) < 0) {
print_error("attach: ptrace(PT_CONTINUE, %d) failed with %d\n", pid, res);
return false;
}
return true;
}
// waits until the ATTACH has stopped the process
// by signal SIGSTOP
static bool ptrace_waitpid(pid_t pid) {
int ret;
int status;
while (true) {
// Wait for debuggee to stop.
ret = waitpid(pid, &status, 0);
if (ret >= 0) {
if (WIFSTOPPED(status)) {
// Any signal will stop the thread, make sure it is SIGSTOP. Otherwise SIGSTOP
// will still be pending and delivered when the process is DETACHED and the process
// will go to sleep.
if (WSTOPSIG(status) == SIGSTOP) {
// Debuggee stopped by SIGSTOP.
return true;
}
if (!ptrace_continue(pid, WSTOPSIG(status))) {
print_error("attach: Failed to correctly attach to VM. VM might HANG! [PTRACE_CONT failed, stopped by %d]\n", WSTOPSIG(status));
return false;
}
} else {
print_error("attach: waitpid(): Child process exited/terminated (status = 0x%x)\n", status);
return false;
}
} else {
switch (errno) {
case EINTR:
continue;
break;
case ECHILD:
print_error("attach: waitpid() failed. Child process pid (%d) does not exist \n", pid);
break;
case EINVAL:
print_error("attach: waitpid() failed. Invalid options argument.\n");
break;
default:
print_error("attach: waitpid() failed. Unexpected error %d\n",errno);
break;
}
return false;
}
}
}
// attach to a process/thread specified by "pid"
static bool ptrace_attach(pid_t pid) {
int res;
if ((res = ptrace(PT_ATTACH, pid, 0, 0)) < 0) {
print_error("ptrace(PT_ATTACH, %d) failed with %d\n", pid, res);
return false;
} else {
return ptrace_waitpid(pid);
}
}
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: attach0
* Signature: (I)V
*/
JNIEXPORT void JNICALL
Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_attach0__I(
JNIEnv *env, jobject this_obj, jint jpid)
{
print_debug("attach0 called for jpid=%d\n", (int)jpid);
JNF_COCOA_ENTER(env);
kern_return_t result;
task_t gTask = 0;
result = task_for_pid(mach_task_self(), jpid, &gTask);
if (result != KERN_SUCCESS) {
print_error("attach: task_for_pid(%d) failed: '%s' (%d)\n", (int)jpid, mach_error_string(result), result);
THROW_NEW_DEBUGGER_EXCEPTION("Can't attach to the process. Could be caused by an incorrect pid or lack of privileges.");
}
putTask(env, this_obj, gTask);
// use ptrace to stop the process
// on os x, ptrace only needs to be called on the process, not the individual threads
if (ptrace_attach(jpid) != true) {
mach_port_deallocate(mach_task_self(), gTask);
THROW_NEW_DEBUGGER_EXCEPTION("Can't attach to the process");
}
id symbolicator = nil;
id jrsSymbolicator = objc_lookUpClass("JRSSymbolicator");
if (jrsSymbolicator != nil) {
id (*dynamicCall)(id, SEL, pid_t) = (id (*)(id, SEL, pid_t))&objc_msgSend;
symbolicator = dynamicCall(jrsSymbolicator, @selector(symbolicatorForPid:), (pid_t)jpid);
}
if (symbolicator != nil) {
CFRetain(symbolicator); // pin symbolicator while in java heap
}
putSymbolicator(env, this_obj, symbolicator);
if (symbolicator == nil) {
THROW_NEW_DEBUGGER_EXCEPTION("Can't attach symbolicator to the process");
}
JNF_COCOA_EXIT(env);
}
/** For core file,
called from Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_attach0__Ljava_lang_String_2Ljava_lang_String_2 */
static void fillLoadObjects(JNIEnv* env, jobject this_obj, struct ps_prochandle* ph) {
int n = 0, i = 0;
// 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;
}
}
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: attach0
* Signature: (Ljava/lang/String;Ljava/lang/String;)V
*/
JNIEXPORT void JNICALL
Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_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;
print_debug("attach: %s %s\n", execName_cstr, coreName_cstr);
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);
fillLoadObjects(env, this_obj, ph);
}
/*
* Class: sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
* Method: detach0
* Signature: ()V
*/
JNIEXPORT void JNICALL
Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_detach0(
JNIEnv *env, jobject this_obj)
{
print_debug("detach0 called\n");
struct ps_prochandle* ph = get_proc_handle(env, this_obj);
if (ph != NULL && ph->core != NULL) {
Prelease(ph);
return;
}
JNF_COCOA_ENTER(env);
task_t gTask = getTask(env, this_obj);
// detach from the ptraced process causing it to resume execution
int pid;
kern_return_t k_res;
k_res = pid_for_task(gTask, &pid);
if (k_res != KERN_SUCCESS) {
print_error("detach: pid_for_task(%d) failed (%d)\n", pid, k_res);
}
else {
int res = ptrace(PT_DETACH, pid, 0, 0);
if (res < 0) {
print_error("detach: ptrace(PT_DETACH, %d) failed (%d)\n", pid, res);
}
}
mach_port_deallocate(mach_task_self(), gTask);
id symbolicator = getSymbolicator(env, this_obj);
if (symbolicator != nil) {
CFRelease(symbolicator);
}
JNF_COCOA_EXIT(env);
}
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