xref: /external/lldb/tools/debugserver/source/RNBRemote.h

//===-- RNBRemote.h ---------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  Created by Greg Clayton on 12/12/07.
//
//===----------------------------------------------------------------------===//

#ifndef __RNBRemote_h__
#define __RNBRemote_h__

#include "RNBDefs.h"
#include "DNB.h"
#include "RNBContext.h"
#include "RNBSocket.h"
#include "PThreadMutex.h"
#include <string>
#include <vector>
#include <deque>
#include <map>

class RNBSocket;
class RNBContext;
class PThreadEvents;

enum event_loop_mode { debug_nub, gdb_remote_protocol, done };

class RNBRemote
{
public:

    typedef enum {
        invalid_packet = 0,
        ack,                            // '+'
        nack,                           // '-'
        halt,                           // ^C  (async halt)
        use_extended_mode,              // '!'
        why_halted,                     // '?'
        set_argv,                       // 'A'
        set_bp,                         // 'B'
        cont,                           // 'c'
        continue_with_sig,              // 'C'
        detach,                         // 'D'
        read_general_regs,              // 'g'
        write_general_regs,             // 'G'
        set_thread,                     // 'H'
        step_inferior_one_cycle,        // 'i'
        signal_and_step_inf_one_cycle,  // 'I'
        kill,                           // 'k'
        read_memory,                    // 'm'
        write_memory,                   // 'M'
        read_register,                  // 'p'
        write_register,                 // 'P'
        restart,                        // 'R'
        single_step,                    // 's'
        single_step_with_sig,           // 'S'
        search_mem_backwards,           // 't'
        thread_alive_p,                 // 'T'
        vattach,                        // 'vAttach;pid'
        vattachwait,                    // 'vAttachWait:XX...' where XX is one or more hex encoded process name ASCII bytes
        vattachname,                    // 'vAttachName:XX...' where XX is one or more hex encoded process name ASCII bytes
        vcont,                          // 'vCont'
        vcont_list_actions,             // 'vCont?'
        write_data_to_memory,           // 'X'
        insert_mem_bp,                  // 'Z0'
        remove_mem_bp,                  // 'z0'
        insert_hardware_bp,             // 'Z1'
        remove_hardware_bp,             // 'z1'
        insert_write_watch_bp,          // 'Z2'
        remove_write_watch_bp,          // 'z2'
        insert_read_watch_bp,           // 'Z3'
        remove_read_watch_bp,           // 'z3'
        insert_access_watch_bp,         // 'Z4'
        remove_access_watch_bp,         // 'z4'

        query_current_thread_id,        // 'qC'
        query_memory_crc,               // 'qCRC:'
        query_thread_ids_first,         // 'qfThreadInfo'
        query_thread_ids_subsequent,    // 'qsThreadInfo'
        query_thread_extra_info,        // 'qThreadExtraInfo'
        query_thread_stop_info,         // 'qThreadStopInfo'
        query_image_offsets,            // 'qOffsets'
        query_symbol_lookup,            // 'gSymbols'
        query_launch_success,           // 'qLaunchSuccess'
        query_register_info,            // 'qRegisterInfo'
        query_shlib_notify_info_addr,   // 'qShlibInfoAddr'
        query_step_packet_supported,    // 'qStepPacketSupported'
        query_host_info,                // 'qHostInfo'
        pass_signals_to_inferior,       // 'QPassSignals'
        start_noack_mode,               // 'QStartNoAckMode'
        prefix_reg_packets_with_tid,    // 'QPrefixRegisterPacketsWithThreadID
        set_logging_mode,               // 'QSetLogging:'
        set_max_packet_size,            // 'QSetMaxPacketSize:'
        set_max_payload_size,           // 'QSetMaxPayloadSize:'
        set_environment_variable,       // 'QEnvironment:'
        set_disable_aslr,               // 'QSetDisableASLR:'
        set_stdin,                      // 'QSetSTDIN:'
        set_stdout,                     // 'QSetSTDOUT:'
        set_stderr,                     // 'QSetSTDERR:'
        set_working_dir,                // 'QSetWorkingDir:'
        allocate_memory,                // '_M'
        deallocate_memory,              // '_m'

        unknown_type,
    } PacketEnum;

    typedef rnb_err_t (RNBRemote::*HandlePacketCallback)(const char *p);

    RNBRemote ();
    ~RNBRemote ();

    void            Initialize();

    bool            InitializeRegisters ();

    rnb_err_t       HandleAsyncPacket(PacketEnum *type = NULL);
    rnb_err_t       HandleReceivedPacket(PacketEnum *type = NULL);

    nub_thread_t    GetContinueThread () const
                    {
                        return m_continue_thread;
                    }

    void            SetContinueThread (nub_thread_t tid)
                    {
                        m_continue_thread = tid;
                    }

    nub_thread_t    GetCurrentThread () const
                    {
                        if (m_thread == 0 || m_thread == -1)
                            return DNBProcessGetCurrentThread (m_ctx.ProcessID());
                        return m_thread;
                    }

    void            SetCurrentThread (nub_thread_t tid)
                    {
                        DNBProcessSetCurrentThread (m_ctx.ProcessID(), tid);
                        m_thread = tid;
                    }

    static void*    ThreadFunctionReadRemoteData(void *arg);
    void            StartReadRemoteDataThread ();
    void            StopReadRemoteDataThread ();

    void NotifyThatProcessStopped (void);

    rnb_err_t HandlePacket_A (const char *p);
    rnb_err_t HandlePacket_H (const char *p);
    rnb_err_t HandlePacket_qC (const char *p);
    rnb_err_t HandlePacket_qLaunchSuccess (const char *p);
    rnb_err_t HandlePacket_qRegisterInfo (const char *p);
    rnb_err_t HandlePacket_qShlibInfoAddr (const char *p);
    rnb_err_t HandlePacket_qStepPacketSupported (const char *p);
    rnb_err_t HandlePacket_qThreadInfo (const char *p);
    rnb_err_t HandlePacket_qThreadExtraInfo (const char *p);
    rnb_err_t HandlePacket_qThreadStopInfo (const char *p);
    rnb_err_t HandlePacket_qHostInfo (const char *p);
    rnb_err_t HandlePacket_QStartNoAckMode (const char *p);
    rnb_err_t HandlePacket_QThreadSuffixSupported (const char *p);
    rnb_err_t HandlePacket_QSetLogging (const char *p);
    rnb_err_t HandlePacket_QSetDisableASLR (const char *p);
    rnb_err_t HandlePacket_QSetSTDIO (const char *p);
    rnb_err_t HandlePacket_QSetWorkingDir (const char *p);
    rnb_err_t HandlePacket_QSetMaxPayloadSize (const char *p);
    rnb_err_t HandlePacket_QSetMaxPacketSize (const char *p);
    rnb_err_t HandlePacket_QEnvironment (const char *p);
    rnb_err_t HandlePacket_QPrefixRegisterPacketsWithThreadID (const char *p);
    rnb_err_t HandlePacket_last_signal (const char *p);
    rnb_err_t HandlePacket_m (const char *p);
    rnb_err_t HandlePacket_M (const char *p);
    rnb_err_t HandlePacket_X (const char *p);
    rnb_err_t HandlePacket_g (const char *p);
    rnb_err_t HandlePacket_G (const char *p);
    rnb_err_t HandlePacket_z (const char *p);
    rnb_err_t HandlePacket_T (const char *p);
    rnb_err_t HandlePacket_p (const char *p);
    rnb_err_t HandlePacket_P (const char *p);
    rnb_err_t HandlePacket_c (const char *p);
    rnb_err_t HandlePacket_C (const char *p);
    rnb_err_t HandlePacket_D (const char *p);
    rnb_err_t HandlePacket_k (const char *p);
    rnb_err_t HandlePacket_s (const char *p);
    rnb_err_t HandlePacket_S (const char *p);
    rnb_err_t HandlePacket_v (const char *p);
    rnb_err_t HandlePacket_UNIMPLEMENTED (const char *p);
    rnb_err_t HandlePacket_ILLFORMED (const char *file, int line, const char *p, const char *description);
    rnb_err_t HandlePacket_AllocateMemory (const char *p);
    rnb_err_t HandlePacket_DeallocateMemory (const char *p);

    rnb_err_t HandlePacket_stop_process (const char *p);

    rnb_err_t SendStopReplyPacketForThread (nub_thread_t tid);
    rnb_err_t SendHexEncodedBytePacket (const char *header, const void *buf, size_t buf_len, const char *footer);
    rnb_err_t SendSTDOUTPacket (char *buf, nub_size_t buf_size);
    rnb_err_t SendSTDERRPacket (char *buf, nub_size_t buf_size);
    void      FlushSTDIO ();

    RNBContext&     Context() { return m_ctx; }
    RNBSocket&      Comm() { return m_comm; }

    void
    SetUseNativeRegisters (bool b)
    {
        m_use_native_regs = b;
    }
private:
    // Outlaw some contructors
    RNBRemote (const RNBRemote &);

protected:

    rnb_err_t GetCommData ();
    void CommDataReceived(const std::string& data);
    struct Packet
    {
        typedef std::vector<Packet>         collection;
        typedef collection::iterator        iterator;
        typedef collection::const_iterator  const_iterator;
        PacketEnum type;
        HandlePacketCallback normal;    // Function to call when inferior is halted
        HandlePacketCallback async;     // Function to call when inferior is running
        std::string abbrev;
        std::string printable_name;

        bool
        IsPlatformPacket () const
        {
            switch (type)
            {
            case set_logging_mode:
            case query_host_info:
                return true;
            default:
                    break;
            }
            return false;
        }
        Packet() :
            type(invalid_packet),
            normal (NULL),
            async (NULL),
            abbrev (),
            printable_name ()
        {
        }

        Packet( PacketEnum in_type,
                HandlePacketCallback in_normal,
                HandlePacketCallback in_async,
                const char *in_abbrev,
                const char *in_printable_name) :
            type    (in_type),
            normal  (in_normal),
            async   (in_async),
            abbrev  (in_abbrev),
            printable_name (in_printable_name)
        {
        }
    };

    rnb_err_t       GetPacket (std::string &packet_data, RNBRemote::Packet& packet_info, bool wait);
    rnb_err_t       SendPacket (const std::string &);

    void CreatePacketTable ();
    rnb_err_t GetPacketPayload (std::string &);

    nub_thread_t
    ExtractThreadIDFromThreadSuffix (const char *p);

    // gdb can send multiple Z/z packets for the same address and
    // these calls must be ref counted.
    struct Breakpoint
    {
        Breakpoint(nub_break_t breakID) :
            m_breakID(breakID),
            m_refCount(1)
        {
        }

        Breakpoint() :
            m_breakID(INVALID_NUB_BREAK_ID),
            m_refCount(0)
        {
        }

        Breakpoint(const Breakpoint& rhs) :
            m_breakID(rhs.m_breakID),
            m_refCount(rhs.m_refCount)
        {
        }

        nub_break_t BreakID() const { return m_breakID; }
        uint32_t RefCount() const { return m_refCount; }
        void Release() { if (m_refCount > 0) --m_refCount; }
        void Retain() { ++m_refCount; }

        nub_break_t m_breakID;
        uint32_t m_refCount;
    };
    typedef std::map<nub_addr_t, Breakpoint> BreakpointMap;
    typedef BreakpointMap::iterator          BreakpointMapIter;
    typedef BreakpointMap::const_iterator    BreakpointMapConstIter;
    RNBContext      m_ctx;              // process context
    RNBSocket       m_comm;             // communication port
    std::string     m_arch;
    nub_thread_t    m_continue_thread;  // thread to continue; 0 for any, -1 for all
    nub_thread_t    m_thread;           // thread for other ops; 0 for any, -1 for all
    PThreadMutex    m_mutex;            // Mutex that protects
    uint32_t        m_packets_recvd;
    Packet::collection m_packets;
    std::deque<std::string> m_rx_packets;
    std::string     m_rx_partial_data;  // For packets that may come in more than one batch, anything left over can be left here
    pthread_t       m_rx_pthread;
    BreakpointMap   m_breakpoints;
    BreakpointMap   m_watchpoints;
    uint32_t        m_max_payload_size;  // the maximum sized payload we should send to gdb
    bool            m_extended_mode:1,   // are we in extended mode?
                    m_noack_mode:1,      // are we in no-ack mode?
                    m_noack_mode_just_enabled:1, // Did we just enable this and need to compute one more checksum?
                    m_use_native_regs:1, // Use native registers by querying DNB layer for register definitions?
                    m_thread_suffix_supported:1; // Set to true if the 'p', 'P', 'g', and 'G' packets should be prefixed with the thread ID and colon:
                                                                // "$pRR;thread:TTTT;" instead of "$pRR"
                                                                // "$PRR=VVVVVVVV;thread:TTTT;" instead of "$PRR=VVVVVVVV"
                                                                // "$g;thread:TTTT" instead of "$g"
                                                                // "$GVVVVVVVVVVVVVV;thread:TTTT;#00 instead of "$GVVVVVVVVVVVVVV"
};

/* We translate the /usr/include/mach/exception_types.h exception types
   (e.g. EXC_BAD_ACCESS) to the fake BSD signal numbers that gdb uses
   in include/gdb/signals.h (e.g. TARGET_EXC_BAD_ACCESS).  These hard
   coded values for TARGET_EXC_BAD_ACCESS et al must match the gdb
   values in its include/gdb/signals.h.  */

#define TARGET_EXC_BAD_ACCESS      0x91
#define TARGET_EXC_BAD_INSTRUCTION 0x92
#define TARGET_EXC_ARITHMETIC      0x93
#define TARGET_EXC_EMULATION       0x94
#define TARGET_EXC_SOFTWARE        0x95
#define TARGET_EXC_BREAKPOINT      0x96

/* Generally speaking, you can't assume gdb can receive more than 399 bytes
   at a time with a random gdb.  This bufsize constant is only specifying
   how many bytes gdb can *receive* from debugserver -- it tells us nothing
   about how many bytes gdb might try to send in a single packet.  */
#define DEFAULT_GDB_REMOTE_PROTOCOL_BUFSIZE 399

#endif // #ifndef __RNBRemote_h__