/*

 * Copyright (c) 2003, 2018, 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.

 *

 */

#ifndef _LIBPROC_H_

#define _LIBPROC_H_

#include <jni.h>

#include <unistd.h>

#include <stdint.h>

#include "proc_service.h"

#include <sys/ptrace.h>

/************************************************************************************

0. This is very minimal subset of Solaris libproc just enough for current application.

Please note that the bulk of the functionality is from proc_service interface. This

adds Pgrab__ and some missing stuff. We hide the difference b/w live process and core

file by this interface.

1. pthread_id unique in both NPTL & LinuxThreads. We store this in

OSThread::_pthread_id in JVM code.

2. All threads see the same pid when they call getpid() under NPTL.

Threads receive different pid under LinuxThreads. We used to save the result of

::getpid() call in OSThread::_thread_id. This way uniqueness of OSThread::_thread_id

was lost under NPTL. Now, we store the result of ::gettid() call in

OSThread::_thread_id. Because gettid returns actual pid of thread (lwp id), this is

unique again. We therefore use OSThread::_thread_id as unique identifier.

3. There is a unique LWP id under both thread libraries. libthread_db  maps pthread_id

to its underlying lwp_id under both the thread libraries. thread_info.lwp_id stores

lwp_id of the thread. The lwp id is nothing but the actual pid of clone'd processes. But

unfortunately libthread_db does not work very well for core dumps. So, we get pthread_id

only for processes. For core dumps, we don't use libthread_db at all (like gdb).

4. ptrace operates on this LWP id under both the thread libraries. When we say 'pid' for

ptrace call, we refer to lwp_id of the thread.

5. for core file, we parse ELF files and read data from them. For processes we  use

combination of ptrace and /proc calls.

*************************************************************************************/

#if defined(sparc) || defined(sparcv9) || defined(ppc64) || defined(ppc64le)

#include <asm/ptrace.h>

#define user_regs_struct  pt_regs

#endif

#if defined(aarch64) || defined(arm64)

#include <asm/ptrace.h>

#define user_regs_struct user_pt_regs

#elif defined(arm)

#include <asm/ptrace.h>

#define user_regs_struct  pt_regs

#endif

#if defined(s390x)

#include <asm/ptrace.h>

#endif

// This C bool type must be int for compatibility with Linux calls and

// it would be a mistake to equivalence it to C++ bool on many platforms

typedef int bool;

#define true  1

#define false 0

struct ps_prochandle;

// attach to a process

// attach to a core dump

// release a process or core

// functions not directly available in Solaris libproc

// initialize libproc (call this only once per app)

// pass true to make library verbose

// get number of threads

int get_num_threads(struct ps_prochandle* ph);

// get lwp_id of n'th thread

lwpid_t get_lwp_id(struct ps_prochandle* ph, int index);

// get regs for a given lwp

bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lid, struct user_regs_struct* regs);

// get number of shared objects

int get_num_libs(struct ps_prochandle* ph);

// get name of n'th lib

const char* get_lib_name(struct ps_prochandle* ph, int index);

// get base of lib

uintptr_t get_lib_base(struct ps_prochandle* ph, int index);

// returns true if given library is found in lib list

bool find_lib(struct ps_prochandle* ph, const char *lib_name);

// symbol lookup

uintptr_t lookup_symbol(struct ps_prochandle* ph,  const char* object_name,

                       const char* sym_name);

// address->nearest symbol lookup. return NULL for no symbol

const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset);

struct ps_prochandle* get_proc_handle(JNIEnv* env, jobject this_obj);

void throw_new_debugger_exception(JNIEnv* env, const char* errMsg);

#endif //__LIBPROC_H_