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path: root/source/Plugins/Process/Linux/NativeRegisterContextLinux_mips64.cpp
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//===-- NativeRegisterContextLinux_mips64.cpp ---------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#if defined (__mips__)

#include "NativeRegisterContextLinux_mips64.h"

// C Includes
// C++ Includes

// Other libraries and framework includes
#include "lldb/Core/Error.h"
#include "lldb/Core/RegisterValue.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/Host.h"
#include "lldb/Core/EmulateInstruction.h"
#include "lldb/lldb-enumerations.h"
#include "lldb/lldb-private-enumerations.h"
#include "Plugins/Process/Linux/NativeProcessLinux.h"
#include "Plugins/Process/Linux/Procfs.h"
#include "Plugins/Process/Utility/RegisterContextLinux_mips64.h"
#include "Plugins/Process/Utility/RegisterContextLinux_mips.h"
#define NT_MIPS_MSA 0x600
#define CONFIG5_FRE (1 << 8)
#define SR_FR (1 << 26)
#define NUM_REGISTERS 32

#include <sys/ptrace.h>
#include <asm/ptrace.h>

#ifndef PTRACE_GET_WATCH_REGS
enum pt_watch_style
{
    pt_watch_style_mips32,
    pt_watch_style_mips64
};
struct mips32_watch_regs
{
    uint32_t watchlo[8];
    uint16_t watchhi[8];
    uint16_t watch_masks[8];
    uint32_t num_valid;
} __attribute__((aligned(8)));

struct mips64_watch_regs
{
    uint64_t watchlo[8];
    uint16_t watchhi[8];
    uint16_t watch_masks[8];
    uint32_t num_valid;
} __attribute__((aligned(8)));

struct pt_watch_regs
{
    enum pt_watch_style style;
    union
    {
        struct mips32_watch_regs mips32;
        struct mips64_watch_regs mips64;
    };
};

#define PTRACE_GET_WATCH_REGS 0xd0
#define PTRACE_SET_WATCH_REGS 0xd1
#endif

#define W (1 << 0)
#define R (1 << 1)
#define I (1 << 2)

#define IRW  (I | R | W)

struct pt_watch_regs default_watch_regs;

using namespace lldb_private;
using namespace lldb_private::process_linux;

// ----------------------------------------------------------------------------
// Private namespace.
// ----------------------------------------------------------------------------

namespace
{
    // mips general purpose registers.
    const uint32_t
    g_gp_regnums_mips[] =
    {
        gpr_zero_mips,
        gpr_r1_mips,
        gpr_r2_mips,
        gpr_r3_mips,
        gpr_r4_mips,
        gpr_r5_mips,
        gpr_r6_mips,
        gpr_r7_mips,
        gpr_r8_mips,
        gpr_r9_mips,
        gpr_r10_mips,
        gpr_r11_mips,
        gpr_r12_mips,
        gpr_r13_mips,
        gpr_r14_mips,
        gpr_r15_mips,
        gpr_r16_mips,
        gpr_r17_mips,
        gpr_r18_mips,
        gpr_r19_mips,
        gpr_r20_mips,
        gpr_r21_mips,
        gpr_r22_mips,
        gpr_r23_mips,
        gpr_r24_mips,
        gpr_r25_mips,
        gpr_r26_mips,
        gpr_r27_mips,
        gpr_gp_mips,
        gpr_sp_mips,
        gpr_r30_mips,
        gpr_ra_mips,
        gpr_sr_mips,
        gpr_mullo_mips,
        gpr_mulhi_mips,
        gpr_badvaddr_mips,
        gpr_cause_mips,
        gpr_pc_mips,
        gpr_config5_mips,
        LLDB_INVALID_REGNUM     // register sets need to end with this flag
    };

    static_assert((sizeof(g_gp_regnums_mips) / sizeof(g_gp_regnums_mips[0])) - 1 == k_num_gpr_registers_mips,
                  "g_gp_regnums_mips has wrong number of register infos");

    // mips floating point registers.
    const uint32_t
    g_fp_regnums_mips[] =
    {
        fpr_f0_mips,
        fpr_f1_mips,
        fpr_f2_mips,
        fpr_f3_mips,
        fpr_f4_mips,
        fpr_f5_mips,
        fpr_f6_mips,
        fpr_f7_mips,
        fpr_f8_mips,
        fpr_f9_mips,
        fpr_f10_mips,
        fpr_f11_mips,
        fpr_f12_mips,
        fpr_f13_mips,
        fpr_f14_mips,
        fpr_f15_mips,
        fpr_f16_mips,
        fpr_f17_mips,
        fpr_f18_mips,
        fpr_f19_mips,
        fpr_f20_mips,
        fpr_f21_mips,
        fpr_f22_mips,
        fpr_f23_mips,
        fpr_f24_mips,
        fpr_f25_mips,
        fpr_f26_mips,
        fpr_f27_mips,
        fpr_f28_mips,
        fpr_f29_mips,
        fpr_f30_mips,
        fpr_f31_mips,
        fpr_fcsr_mips,
        fpr_fir_mips,
        fpr_config5_mips,
        LLDB_INVALID_REGNUM     // register sets need to end with this flag
    };

    static_assert((sizeof(g_fp_regnums_mips) / sizeof(g_fp_regnums_mips[0])) - 1 == k_num_fpr_registers_mips,
                  "g_fp_regnums_mips has wrong number of register infos");

    // mips MSA registers.
    const uint32_t
    g_msa_regnums_mips[] =
    {
        msa_w0_mips,
        msa_w1_mips,
        msa_w2_mips,
        msa_w3_mips,
        msa_w4_mips,
        msa_w5_mips,
        msa_w6_mips,
        msa_w7_mips,
        msa_w8_mips,
        msa_w9_mips,
        msa_w10_mips,
        msa_w11_mips,
        msa_w12_mips,
        msa_w13_mips,
        msa_w14_mips,
        msa_w15_mips,
        msa_w16_mips,
        msa_w17_mips,
        msa_w18_mips,
        msa_w19_mips,
        msa_w20_mips,
        msa_w21_mips,
        msa_w22_mips,
        msa_w23_mips,
        msa_w24_mips,
        msa_w25_mips,
        msa_w26_mips,
        msa_w27_mips,
        msa_w28_mips,
        msa_w29_mips,
        msa_w30_mips,
        msa_w31_mips,
        msa_fcsr_mips,
        msa_fir_mips,
        msa_mcsr_mips,
        msa_mir_mips,
        msa_config5_mips,
        LLDB_INVALID_REGNUM     // register sets need to end with this flag
    };

    static_assert((sizeof(g_msa_regnums_mips) / sizeof(g_msa_regnums_mips[0])) - 1 == k_num_msa_registers_mips,
                  "g_msa_regnums_mips has wrong number of register infos");

    // mips64 general purpose registers.
    const uint32_t
    g_gp_regnums_mips64[] =
    {
        gpr_zero_mips64,
        gpr_r1_mips64,
        gpr_r2_mips64,
        gpr_r3_mips64,
        gpr_r4_mips64,
        gpr_r5_mips64,
        gpr_r6_mips64,
        gpr_r7_mips64,
        gpr_r8_mips64,
        gpr_r9_mips64,
        gpr_r10_mips64,
        gpr_r11_mips64,
        gpr_r12_mips64,
        gpr_r13_mips64,
        gpr_r14_mips64,
        gpr_r15_mips64,
        gpr_r16_mips64,
        gpr_r17_mips64,
        gpr_r18_mips64,
        gpr_r19_mips64,
        gpr_r20_mips64,
        gpr_r21_mips64,
        gpr_r22_mips64,
        gpr_r23_mips64,
        gpr_r24_mips64,
        gpr_r25_mips64,
        gpr_r26_mips64,
        gpr_r27_mips64,
        gpr_gp_mips64,
        gpr_sp_mips64,
        gpr_r30_mips64,
        gpr_ra_mips64,
        gpr_sr_mips64,
        gpr_mullo_mips64,
        gpr_mulhi_mips64,
        gpr_badvaddr_mips64,
        gpr_cause_mips64,
        gpr_pc_mips64,
        gpr_config5_mips64,
        LLDB_INVALID_REGNUM     // register sets need to end with this flag
    };

    static_assert((sizeof(g_gp_regnums_mips64) / sizeof(g_gp_regnums_mips64[0])) - 1 == k_num_gpr_registers_mips64,
                  "g_gp_regnums_mips64 has wrong number of register infos");

    // mips64 floating point registers.
    const uint32_t
    g_fp_regnums_mips64[] =
    {
        fpr_f0_mips64,
        fpr_f1_mips64,
        fpr_f2_mips64,
        fpr_f3_mips64,
        fpr_f4_mips64,
        fpr_f5_mips64,
        fpr_f6_mips64,
        fpr_f7_mips64,
        fpr_f8_mips64,
        fpr_f9_mips64,
        fpr_f10_mips64,
        fpr_f11_mips64,
        fpr_f12_mips64,
        fpr_f13_mips64,
        fpr_f14_mips64,
        fpr_f15_mips64,
        fpr_f16_mips64,
        fpr_f17_mips64,
        fpr_f18_mips64,
        fpr_f19_mips64,
        fpr_f20_mips64,
        fpr_f21_mips64,
        fpr_f22_mips64,
        fpr_f23_mips64,
        fpr_f24_mips64,
        fpr_f25_mips64,
        fpr_f26_mips64,
        fpr_f27_mips64,
        fpr_f28_mips64,
        fpr_f29_mips64,
        fpr_f30_mips64,
        fpr_f31_mips64,
        fpr_fcsr_mips64,
        fpr_fir_mips64,
        fpr_config5_mips64,
        LLDB_INVALID_REGNUM     // register sets need to end with this flag
    };

    static_assert((sizeof(g_fp_regnums_mips64) / sizeof(g_fp_regnums_mips64[0])) - 1 == k_num_fpr_registers_mips64,
                  "g_fp_regnums_mips64 has wrong number of register infos");

    // mips64 MSA registers.
    const uint32_t
    g_msa_regnums_mips64[] =
    {
        msa_w0_mips64,
        msa_w1_mips64,
        msa_w2_mips64,
        msa_w3_mips64,
        msa_w4_mips64,
        msa_w5_mips64,
        msa_w6_mips64,
        msa_w7_mips64,
        msa_w8_mips64,
        msa_w9_mips64,
        msa_w10_mips64,
        msa_w11_mips64,
        msa_w12_mips64,
        msa_w13_mips64,
        msa_w14_mips64,
        msa_w15_mips64,
        msa_w16_mips64,
        msa_w17_mips64,
        msa_w18_mips64,
        msa_w19_mips64,
        msa_w20_mips64,
        msa_w21_mips64,
        msa_w22_mips64,
        msa_w23_mips64,
        msa_w24_mips64,
        msa_w25_mips64,
        msa_w26_mips64,
        msa_w27_mips64,
        msa_w28_mips64,
        msa_w29_mips64,
        msa_w30_mips64,
        msa_w31_mips64,
        msa_fcsr_mips64,
        msa_fir_mips64,
        msa_mcsr_mips64,
        msa_mir_mips64,
        msa_config5_mips64,
        LLDB_INVALID_REGNUM     // register sets need to end with this flag
    };

    static_assert((sizeof(g_msa_regnums_mips64) / sizeof(g_msa_regnums_mips64[0])) - 1 == k_num_msa_registers_mips64,
                  "g_msa_regnums_mips64 has wrong number of register infos");

    // Number of register sets provided by this context.
    enum
    {
        k_num_register_sets = 3
    };

    // Register sets for mips.
    static const RegisterSet
    g_reg_sets_mips[k_num_register_sets] =
    {
        { "General Purpose Registers",  "gpr", k_num_gpr_registers_mips, g_gp_regnums_mips },
        { "Floating Point Registers",   "fpu", k_num_fpr_registers_mips, g_fp_regnums_mips },
        { "MSA Registers",              "msa", k_num_msa_registers_mips, g_msa_regnums_mips }
    };

    // Register sets for mips64.
    static const RegisterSet
    g_reg_sets_mips64[k_num_register_sets] =
    {
        { "General Purpose Registers",  "gpr", k_num_gpr_registers_mips64, g_gp_regnums_mips64 },
        { "Floating Point Registers",   "fpu", k_num_fpr_registers_mips64, g_fp_regnums_mips64 },
        { "MSA Registers",              "msa", k_num_msa_registers_mips64, g_msa_regnums_mips64 },
    };

} // end of anonymous namespace

NativeRegisterContextLinux*
NativeRegisterContextLinux::CreateHostNativeRegisterContextLinux(const ArchSpec& target_arch,
                                                                 NativeThreadProtocol &native_thread,
                                                                 uint32_t concrete_frame_idx)
{
    return new NativeRegisterContextLinux_mips64(target_arch, native_thread, concrete_frame_idx);
}

#define REG_CONTEXT_SIZE (GetRegisterInfoInterface ().GetGPRSize () + sizeof(FPR_linux_mips) + sizeof(MSA_linux_mips))

// ----------------------------------------------------------------------------
// NativeRegisterContextLinux_mips64 members.
// ----------------------------------------------------------------------------

static RegisterInfoInterface*
CreateRegisterInfoInterface(const ArchSpec& target_arch)
{
    if (HostInfo::GetArchitecture().GetAddressByteSize() == 4)
    {
        // 32-bit hosts run with a RegisterContextLinux_mips context.
        return new RegisterContextLinux_mips(target_arch, NativeRegisterContextLinux_mips64::IsMSAAvailable());
    }
    else
    {
        assert((HostInfo::GetArchitecture().GetAddressByteSize() == 8) &&
               "Register setting path assumes this is a 64-bit host");
        // mips64 hosts know how to work with 64-bit and 32-bit EXEs using the mips64 register context.
        return new RegisterContextLinux_mips64 (target_arch, NativeRegisterContextLinux_mips64::IsMSAAvailable());
    }
}

NativeRegisterContextLinux_mips64::NativeRegisterContextLinux_mips64 (const ArchSpec& target_arch,
                                                                      NativeThreadProtocol &native_thread, 
                                                                      uint32_t concrete_frame_idx) :
    NativeRegisterContextLinux (native_thread, concrete_frame_idx, CreateRegisterInfoInterface(target_arch))
{
    switch (target_arch.GetMachine ())
    {
        case llvm::Triple::mips:
        case llvm::Triple::mipsel:
            m_reg_info.num_registers        = k_num_registers_mips;
            m_reg_info.num_gpr_registers    = k_num_gpr_registers_mips;
            m_reg_info.num_fpr_registers    = k_num_fpr_registers_mips;
            m_reg_info.last_gpr             = k_last_gpr_mips;
            m_reg_info.first_fpr            = k_first_fpr_mips;
            m_reg_info.last_fpr             = k_last_fpr_mips;
            m_reg_info.first_msa            = k_first_msa_mips;
            m_reg_info.last_msa             = k_last_msa_mips;
            break;
        case llvm::Triple::mips64:
        case llvm::Triple::mips64el:
            m_reg_info.num_registers        = k_num_registers_mips64;
            m_reg_info.num_gpr_registers    = k_num_gpr_registers_mips64;
            m_reg_info.num_fpr_registers    = k_num_fpr_registers_mips64;
            m_reg_info.last_gpr             = k_last_gpr_mips64;
            m_reg_info.first_fpr            = k_first_fpr_mips64;
            m_reg_info.last_fpr             = k_last_fpr_mips64;
            m_reg_info.first_msa            = k_first_msa_mips64;
            m_reg_info.last_msa             = k_last_msa_mips64;
            break;
        default:
            assert(false && "Unhandled target architecture.");
            break;
    }

    // Initialize m_iovec to point to the buffer and buffer size
    // using the conventions of Berkeley style UIO structures, as required
    // by PTRACE extensions.
    m_iovec.iov_base = &m_msa;
    m_iovec.iov_len = sizeof(MSA_linux_mips);

    // init h/w watchpoint addr map
    for (int index = 0;index <= MAX_NUM_WP; index++)
        hw_addr_map[index] = LLDB_INVALID_ADDRESS;

    ::memset(&m_gpr, 0, sizeof(GPR_linux_mips));
    ::memset(&m_fpr, 0, sizeof(FPR_linux_mips));
    ::memset(&m_msa, 0, sizeof(MSA_linux_mips));
}

uint32_t
NativeRegisterContextLinux_mips64::GetRegisterSetCount () const
{
    return k_num_register_sets;
}

lldb::addr_t
NativeRegisterContextLinux_mips64::GetPCfromBreakpointLocation (lldb::addr_t fail_value)
{
    Error error;
    RegisterValue pc_value;
    lldb::addr_t pc = fail_value;
    Log *log (GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS));
    
    if (log)
        log->Printf ("NativeRegisterContextLinux_mips64::%s Reading PC from breakpoint location", __FUNCTION__);

    // PC register is at index 34 of the register array
    const RegisterInfo *const pc_info_p = GetRegisterInfoAtIndex (gpr_pc_mips64);
        
    error = ReadRegister (pc_info_p, pc_value);
    if (error.Success ())
    {
        pc = pc_value.GetAsUInt64 ();
        
        // CAUSE register is at index 37 of the register array
        const RegisterInfo *const cause_info_p = GetRegisterInfoAtIndex (gpr_cause_mips64);
        RegisterValue cause_value;

        ReadRegister (cause_info_p, cause_value);

        uint64_t cause = cause_value.GetAsUInt64 ();
        
        if (log)
            log->Printf ("NativeRegisterContextLinux_mips64::%s PC 0x%" PRIx64 " Cause 0x%" PRIx64, __FUNCTION__, pc, cause);

        /*
         * The breakpoint might be in a delay slot. In this case PC points
         * to the delayed branch instruction rather then the instruction
         * in the delay slot. If the CAUSE.BD flag is set then adjust the 
         * PC based on the size of the branch instruction.
        */
        if ((cause & (1 << 31)) != 0)
        {
            lldb::addr_t branch_delay = 0;
            branch_delay = 4;   // FIXME - Adjust according to size of branch instruction at PC
            pc = pc + branch_delay;
            pc_value.SetUInt64 (pc);
            WriteRegister (pc_info_p, pc_value);
            
            if (log)
                log->Printf ("NativeRegisterContextLinux_mips64::%s New PC 0x%" PRIx64, __FUNCTION__, pc);
        }
    }

    return pc;
}

const RegisterSet *
NativeRegisterContextLinux_mips64::GetRegisterSet (uint32_t set_index) const
{
    if (set_index >= k_num_register_sets)
        return nullptr;

    switch (GetRegisterInfoInterface ().GetTargetArchitecture ().GetMachine ())
    {
        case llvm::Triple::mips64:
        case llvm::Triple::mips64el:
            return &g_reg_sets_mips64[set_index];
        case llvm::Triple::mips:
        case llvm::Triple::mipsel:
            return &g_reg_sets_mips[set_index];
        default:
            assert (false && "Unhandled target architecture.");
            return nullptr;
    }

    return nullptr;
}

lldb_private::Error
NativeRegisterContextLinux_mips64::ReadRegister (const RegisterInfo *reg_info, RegisterValue &reg_value)
{
    Error error;

    if (!reg_info)
    {
        error.SetErrorString ("reg_info NULL");
        return error;
    }

    const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
    if (reg == LLDB_INVALID_REGNUM)
    {
        // This is likely an internal register for lldb use only and should not be directly queried.
        error.SetErrorStringWithFormat ("register \"%s\" is an internal-only lldb register, cannot read directly", reg_info->name);
        return error;
    }

    if (IsMSA(reg) && !IsMSAAvailable())
    {
        error.SetErrorString ("MSA not available on this processor");
        return error;
    }

    if (IsMSA(reg) || IsFPR(reg))
    {
        uint8_t *src;

        error = ReadCP1();

        if (!error.Success())
        {
            error.SetErrorString ("failed to read co-processor 1 register");
            return error;
        }

        if (IsFPR(reg))
        {
            assert (reg_info->byte_offset < sizeof(UserArea));
            src = (uint8_t *)&m_fpr + reg_info->byte_offset - (sizeof(m_gpr));
        }
        else
        {
            assert (reg_info->byte_offset < sizeof(UserArea));
            src = (uint8_t *)&m_msa + reg_info->byte_offset - (sizeof(m_gpr) + sizeof(m_fpr));
        }
        switch (reg_info->byte_size)
        {
            case 4:
                reg_value.SetUInt32(*(uint32_t *)src);
                break;
            case 8:
                reg_value.SetUInt64(*(uint64_t *)src);
                break;
            case 16:
                reg_value.SetBytes((const void *)src, 16, GetByteOrder());
                break;
            default:
                assert(false && "Unhandled data size.");
                error.SetErrorStringWithFormat ("unhandled byte size: %" PRIu32, reg_info->byte_size);
                break;
        }
    }
    else
    {
        error = ReadRegisterRaw(reg, reg_value);
    }

    return error;
}

lldb_private::Error
NativeRegisterContextLinux_mips64::WriteRegister (const RegisterInfo *reg_info, const RegisterValue &reg_value)
{
    Error error;

    assert (reg_info && "reg_info is null");

    const uint32_t reg_index = reg_info->kinds[lldb::eRegisterKindLLDB];

    if (reg_index == LLDB_INVALID_REGNUM)
        return Error ("no lldb regnum for %s", reg_info && reg_info->name ? reg_info->name : "<unknown register>");

    if (IsMSA(reg_index) && !IsMSAAvailable())
    {
        error.SetErrorString ("MSA not available on this processor");
        return error;
    }

    if (IsFPR(reg_index) || IsMSA(reg_index))
    {
        uint8_t *dst;
        uint64_t *src;

        // Initialise the FP and MSA buffers by reading all co-processor 1 registers
        ReadCP1();

        if (IsFPR(reg_index))
        {
            assert (reg_info->byte_offset < sizeof(UserArea));
            dst = (uint8_t *)&m_fpr + reg_info->byte_offset - (sizeof(m_gpr));
        }
        else
        {
            assert (reg_info->byte_offset < sizeof(UserArea));
            dst = (uint8_t *)&m_msa + reg_info->byte_offset - (sizeof(m_gpr) + sizeof(m_fpr));
        }
        switch (reg_info->byte_size)
        {
            case 4:
                *(uint32_t *)dst = reg_value.GetAsUInt32();
                break;
            case 8:
                *(uint64_t *)dst = reg_value.GetAsUInt64();
                break;
            case 16:
                src = (uint64_t *)reg_value.GetBytes();
                *(uint64_t *)dst = *src;
                *(uint64_t *)(dst + 8) = *(src + 1);
                break;
            default:
                assert(false && "Unhandled data size.");
                error.SetErrorStringWithFormat ("unhandled byte size: %" PRIu32, reg_info->byte_size);
                break;
        }
        error = WriteCP1();
        if (!error.Success())
        {
            error.SetErrorString ("failed to write co-processor 1 register");
            return error;
        }
    }
    else
    {
        error = WriteRegisterRaw(reg_index, reg_value);
    }

    return error;
}

Error
NativeRegisterContextLinux_mips64::ReadAllRegisterValues (lldb::DataBufferSP &data_sp)
{
    Error error;

    data_sp.reset (new DataBufferHeap (REG_CONTEXT_SIZE, 0));
    if (!data_sp)
    {
        error.SetErrorStringWithFormat ("failed to allocate DataBufferHeap instance of size %" PRIu64, REG_CONTEXT_SIZE);
        return error;
    }

    error = ReadGPR();
    if (!error.Success())
    {
        error.SetErrorString ("ReadGPR() failed");
        return error;
    }

    error = ReadCP1();
    if (!error.Success())
    {
        error.SetErrorString ("ReadCP1() failed");
        return error;
    }

    uint8_t *dst = data_sp->GetBytes ();
    if (dst == nullptr)
    {
        error.SetErrorStringWithFormat ("DataBufferHeap instance of size %" PRIu64 " returned a null pointer", REG_CONTEXT_SIZE);
        return error;
    }

    ::memcpy (dst, &m_gpr, GetRegisterInfoInterface ().GetGPRSize ());
    dst += GetRegisterInfoInterface ().GetGPRSize ();

    ::memcpy (dst, &m_fpr, GetFPRSize ());
    dst += GetFPRSize ();

    ::memcpy (dst, &m_msa, sizeof(MSA_linux_mips));

    return error;
}

Error
NativeRegisterContextLinux_mips64::WriteAllRegisterValues (const lldb::DataBufferSP &data_sp)
{
    Error error;

    if (!data_sp)
    {
        error.SetErrorStringWithFormat ("NativeRegisterContextLinux_mips64::%s invalid data_sp provided", __FUNCTION__);
        return error;
    }

    if (data_sp->GetByteSize () != REG_CONTEXT_SIZE)
    {
        error.SetErrorStringWithFormat ("NativeRegisterContextLinux_mips64::%s data_sp contained mismatched data size, expected %" PRIu64 ", actual %" PRIu64, __FUNCTION__, REG_CONTEXT_SIZE, data_sp->GetByteSize ());
        return error;
    }


    uint8_t *src = data_sp->GetBytes ();
    if (src == nullptr)
    {
        error.SetErrorStringWithFormat ("NativeRegisterContextLinux_mips64::%s DataBuffer::GetBytes() returned a null pointer", __FUNCTION__);
        return error;
    }

    ::memcpy (&m_gpr, src, GetRegisterInfoInterface ().GetGPRSize ());
    src += GetRegisterInfoInterface ().GetGPRSize ();

    ::memcpy (&m_fpr, src, GetFPRSize ());
    src += GetFPRSize ();

    ::memcpy (&m_msa, src, sizeof(MSA_linux_mips));

    error = WriteGPR();
    if (!error.Success())
    {
        error.SetErrorStringWithFormat ("NativeRegisterContextLinux_mips64::%s WriteGPR() failed", __FUNCTION__);
        return error;
    }

    error = WriteCP1();
    if (!error.Success())
    {
        error.SetErrorStringWithFormat ("NativeRegisterContextLinux_mips64::%s WriteCP1() failed", __FUNCTION__);
        return error;
    }

    return error;
}

Error
NativeRegisterContextLinux_mips64::ReadCP1()
{
    Error error;

    uint8_t *src, *dst;

    lldb::ByteOrder byte_order = GetByteOrder();

    uint32_t IsBigEndian = (byte_order == lldb::eByteOrderBig);

    if (IsMSAAvailable())
    {
        error = NativeRegisterContextLinux::ReadRegisterSet(&m_iovec, sizeof(MSA_linux_mips), NT_MIPS_MSA);
        src = (uint8_t *)&m_msa + (IsBigEndian * 8);
        dst = (uint8_t *)&m_fpr;
        for ( int i = 0; i < NUM_REGISTERS; i++)
        {
            // Copy fp values from msa buffer fetched via ptrace
            *(uint64_t *) dst = *(uint64_t *) src;
            src = src + 16;
            dst = dst + 8;
        }
        m_fpr.fir = m_msa.fir;
        m_fpr.fcsr = m_msa.fcsr;
        m_fpr.config5 = m_msa.config5;
    }
    else
    {
        error = NativeRegisterContextLinux::ReadFPR();
    }

    // TODO: Add support for FRE
    if (IsFR0())
    {
         src = (uint8_t *)&m_fpr + 4 + (IsBigEndian * 4);
         dst = (uint8_t *)&m_fpr + 8 + (IsBigEndian * 4);
         for (int i = 0; i < (NUM_REGISTERS / 2); i++)
         {
              // copy odd single from top of neighbouring even double
              *(uint32_t *) dst = *(uint32_t *) src;
              src = src + 16;
              dst = dst + 16;
         }
    }

    return error;
}

Error
NativeRegisterContextLinux_mips64::WriteCP1()
{
    Error error;

    uint8_t *src, *dst;

    lldb::ByteOrder byte_order = GetByteOrder();

    uint32_t IsBigEndian = (byte_order == lldb::eByteOrderBig);

    // TODO: Add support for FRE
    if (IsFR0())
    {
        src = (uint8_t *)&m_fpr + 8 + (IsBigEndian * 4);
        dst = (uint8_t *)&m_fpr + 4 + (IsBigEndian * 4);
        for (int i = 0; i < (NUM_REGISTERS / 2); i++)
        {
             // copy odd single to top of neighbouring even double
             *(uint32_t *) dst = *(uint32_t *) src;
             src = src + 16;
             dst = dst + 16;
        }
    }

    if (IsMSAAvailable())
    {
        dst = (uint8_t *)&m_msa + (IsBigEndian * 8);
        src = (uint8_t *)&m_fpr;
        for (int i = 0; i < NUM_REGISTERS; i++)
        {
            // Copy fp values to msa buffer for ptrace
            *(uint64_t *) dst = *(uint64_t *) src;
            dst = dst + 16;
            src = src + 8;
        }
        m_msa.fir = m_fpr.fir;
        m_msa.fcsr = m_fpr.fcsr;
        m_msa.config5 = m_fpr.config5;
        error = NativeRegisterContextLinux::WriteRegisterSet(&m_iovec, sizeof(MSA_linux_mips), NT_MIPS_MSA);
    }
    else
    {
        error = NativeRegisterContextLinux::WriteFPR();
    }

    return error;
}

bool
NativeRegisterContextLinux_mips64::IsFR0()
{
    const RegisterInfo *const reg_info_p = GetRegisterInfoAtIndex (gpr_sr_mips64);

    RegisterValue reg_value;
    ReadRegister (reg_info_p, reg_value);

    uint64_t value = reg_value.GetAsUInt64();

    return (!(value & SR_FR));
}

bool
NativeRegisterContextLinux_mips64::IsFRE()
{
    const RegisterInfo *const reg_info_p = GetRegisterInfoAtIndex (gpr_config5_mips64);

    RegisterValue reg_value;
    ReadRegister (reg_info_p, reg_value);

    uint64_t config5 = reg_value.GetAsUInt64();

    return (config5 & CONFIG5_FRE);
}

bool
NativeRegisterContextLinux_mips64::IsFPR(uint32_t reg_index) const
{
    return (m_reg_info.first_fpr <= reg_index && reg_index <= m_reg_info.last_fpr);
}

static uint32_t
GetWatchHi (struct pt_watch_regs *regs, uint32_t index)
{
    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
    if (regs->style == pt_watch_style_mips32)
        return regs->mips32.watchhi[index];
    else if (regs->style == pt_watch_style_mips64)
        return regs->mips64.watchhi[index];
    if(log)
        log->Printf("Invalid watch register style");
    return 0;
}

static void
SetWatchHi (struct pt_watch_regs *regs, uint32_t index, uint16_t value)
{
    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
    if (regs->style == pt_watch_style_mips32)
        regs->mips32.watchhi[index] = value;
    else if (regs->style == pt_watch_style_mips64)
        regs->mips64.watchhi[index] = value;
    if(log)
        log->Printf("Invalid watch register style");
    return;
}

static lldb::addr_t
GetWatchLo (struct pt_watch_regs *regs, uint32_t index)
{
    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
    if (regs->style == pt_watch_style_mips32)
        return regs->mips32.watchlo[index];
    else if (regs->style == pt_watch_style_mips64)
        return regs->mips64.watchlo[index];
    if(log)
        log->Printf("Invalid watch register style");
    return LLDB_INVALID_ADDRESS;
}

static void
SetWatchLo (struct pt_watch_regs *regs, uint32_t index, uint64_t value)
{
    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
    if (regs->style == pt_watch_style_mips32)
        regs->mips32.watchlo[index] = (uint32_t) value;
    else if (regs->style == pt_watch_style_mips64)
        regs->mips64.watchlo[index] = value;
    if(log)
        log->Printf("Invalid watch register style");
    return;
}

static uint32_t
GetIRWMask (struct pt_watch_regs *regs, uint32_t index)
{
    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
    if (regs->style == pt_watch_style_mips32)
        return regs->mips32.watch_masks[index] & IRW;
    else if (regs->style == pt_watch_style_mips64)
        return regs->mips64.watch_masks[index] & IRW;
    if(log)
        log->Printf("Invalid watch register style");
    return 0;
}

static uint32_t
GetRegMask (struct pt_watch_regs *regs, uint32_t index)
{
    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
    if (regs->style == pt_watch_style_mips32)
        return regs->mips32.watch_masks[index] & ~IRW;
    else if (regs->style == pt_watch_style_mips64)
        return regs->mips64.watch_masks[index] & ~IRW;
    if(log)
        log->Printf("Invalid watch register style");
    return 0;
}

static lldb::addr_t
GetRangeMask (lldb::addr_t mask)
{
    lldb::addr_t mask_bit = 1;
    while (mask_bit < mask)
    {
        mask = mask | mask_bit;
        mask_bit <<= 1;
    }
    return mask;
}

static int
GetVacantWatchIndex (struct pt_watch_regs *regs, lldb::addr_t addr, uint32_t size, uint32_t irw, uint32_t num_valid)
{
    lldb::addr_t last_byte = addr + size - 1;
    lldb::addr_t mask = GetRangeMask (addr ^ last_byte) | IRW;
    lldb::addr_t base_addr = addr & ~mask;

    // Check if this address is already watched by previous watch points.
    lldb::addr_t lo;
    uint16_t hi;
    uint32_t vacant_watches = 0;
    for (uint32_t index = 0; index < num_valid; index++)
    {
        lo = GetWatchLo (regs, index);
        if (lo != 0 && irw == ((uint32_t) lo & irw))
        {
            hi = GetWatchHi (regs, index) | IRW;
            lo &= ~(lldb::addr_t) hi;
            if (addr >= lo && last_byte <= (lo + hi))
                return index;
        }
        else
            vacant_watches++;
    }

    // Now try to find a vacant index
    if(vacant_watches > 0)
    {
        vacant_watches = 0;
        for (uint32_t index = 0; index < num_valid; index++)
        {
            lo = GetWatchLo (regs, index);
            if (lo == 0
              && irw == (GetIRWMask (regs, index) & irw))
            {
                if (mask <= (GetRegMask (regs, index) | IRW))
                {
                    // It fits, we can use it. 
                    SetWatchLo (regs, index, base_addr | irw);
                    SetWatchHi (regs, index, mask & ~IRW);
                    return index;
                }
                else
                {
                    // It doesn't fit, but has the proper IRW capabilities
                    vacant_watches++;
                }
            }
        }

        if (vacant_watches > 1)
        {
            // Split this watchpoint accross several registers
            struct pt_watch_regs regs_copy;
            regs_copy = *regs;
            lldb::addr_t break_addr;
            uint32_t segment_size;
            for (uint32_t index = 0; index < num_valid; index++)
            {
                lo = GetWatchLo (&regs_copy, index);
                hi = GetRegMask (&regs_copy, index) | IRW;
                if (lo == 0 && irw == (hi & irw))
                {
                    lo = addr & ~(lldb::addr_t) hi;
                    break_addr = lo + hi + 1;
                    if (break_addr >= addr + size)
                        segment_size = size;
                    else
                        segment_size = break_addr - addr;
                    mask = GetRangeMask (addr ^ (addr + segment_size - 1));
                    SetWatchLo (&regs_copy, index, (addr & ~mask) | irw);
                    SetWatchHi (&regs_copy, index, mask & ~IRW);
                    if (break_addr >= addr + size)
                    {
                        *regs = regs_copy;
                        return index;
                    }
                    size = addr + size - break_addr;
                    addr = break_addr;
                }
            }
        }
    }
    return LLDB_INVALID_INDEX32;
}

bool
NativeRegisterContextLinux_mips64::IsMSA(uint32_t reg_index) const
{
    return (m_reg_info.first_msa <= reg_index && reg_index <= m_reg_info.last_msa);
}

bool
NativeRegisterContextLinux_mips64::IsMSAAvailable()
{
    MSA_linux_mips msa_buf;
    unsigned int regset = NT_MIPS_MSA;

    Error error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, Host::GetCurrentProcessID(), static_cast<void *>(&regset), &msa_buf, sizeof(MSA_linux_mips));

    if (error.Success() && msa_buf.mir)
    {
        return true;
    }

    return false;
}

Error
NativeRegisterContextLinux_mips64::IsWatchpointHit (uint32_t wp_index, bool &is_hit)
{
    if (wp_index >= NumSupportedHardwareWatchpoints())
        return Error("Watchpoint index out of range");

    // reading the current state of watch regs
    struct pt_watch_regs watch_readback;
    Error error =  DoReadWatchPointRegisterValue(m_thread.GetID(), static_cast<void *>(&watch_readback));

    if (GetWatchHi (&watch_readback, wp_index) & (IRW))
    {
        // clear hit flag in watchhi 
        SetWatchHi (&watch_readback, wp_index, (GetWatchHi (&watch_readback, wp_index) & ~(IRW)));
        DoWriteWatchPointRegisterValue(m_thread.GetID(), static_cast<void *>(&watch_readback));
     
        is_hit = true;
        return error;
    }
    is_hit = false;
    return error;
}

Error
NativeRegisterContextLinux_mips64::GetWatchpointHitIndex(uint32_t &wp_index, lldb::addr_t trap_addr) {
    uint32_t num_hw_wps = NumSupportedHardwareWatchpoints();
    for (wp_index = 0; wp_index < num_hw_wps; ++wp_index)
    {
        bool is_hit;
        Error error = IsWatchpointHit(wp_index, is_hit);
        if (error.Fail()) {
            wp_index = LLDB_INVALID_INDEX32;
        } else if (is_hit) {
            return error;
        }
    }
    wp_index = LLDB_INVALID_INDEX32;
    return Error();
}

Error
NativeRegisterContextLinux_mips64::IsWatchpointVacant (uint32_t wp_index, bool &is_vacant)
{
    is_vacant = false;
    return Error("MIPS TODO: NativeRegisterContextLinux_mips64::IsWatchpointVacant not implemented");
}

bool
NativeRegisterContextLinux_mips64::ClearHardwareWatchpoint(uint32_t wp_index)
{
    if (wp_index >= NumSupportedHardwareWatchpoints())
        return false;

    struct pt_watch_regs regs;
    // First reading the current state of watch regs
    DoReadWatchPointRegisterValue(m_thread.GetID(), static_cast<void*>(&regs));

    if (regs.style == pt_watch_style_mips32)
    {
        regs.mips32.watchlo[wp_index] = default_watch_regs.mips32.watchlo[wp_index];
        regs.mips32.watchhi[wp_index] = default_watch_regs.mips32.watchhi[wp_index];
        regs.mips32.watch_masks[wp_index] = default_watch_regs.mips32.watch_masks[wp_index];
    }
    else // pt_watch_style_mips64
    {
        regs.mips64.watchlo[wp_index] = default_watch_regs.mips64.watchlo[wp_index];
        regs.mips64.watchhi[wp_index] = default_watch_regs.mips64.watchhi[wp_index];
        regs.mips64.watch_masks[wp_index] = default_watch_regs.mips64.watch_masks[wp_index];
    }

    Error error = DoWriteWatchPointRegisterValue(m_thread.GetID(), static_cast<void *>(&regs));
    if(!error.Fail())
    {
        hw_addr_map[wp_index] = LLDB_INVALID_ADDRESS;
        return true;
    }
    return false;
}

Error
NativeRegisterContextLinux_mips64::ClearAllHardwareWatchpoints()
{
    return DoWriteWatchPointRegisterValue(m_thread.GetID(), static_cast<void *>(&default_watch_regs));
}

Error
NativeRegisterContextLinux_mips64::SetHardwareWatchpointWithIndex (
        lldb::addr_t addr, size_t size, uint32_t watch_flags, uint32_t wp_index) 
{
    Error error;
    error.SetErrorString ("MIPS TODO: NativeRegisterContextLinux_mips64::SetHardwareWatchpointWithIndex not implemented");
    return error;
}

uint32_t
NativeRegisterContextLinux_mips64::SetHardwareWatchpoint (
        lldb::addr_t addr, size_t size, uint32_t watch_flags)
{
    struct pt_watch_regs regs;

    // First reading the current state of watch regs
    DoReadWatchPointRegisterValue(m_thread.GetID(), static_cast<void *>(&regs));

    // Try if a new watch point fits in this state
    int index = GetVacantWatchIndex (&regs, addr, size, watch_flags, NumSupportedHardwareWatchpoints());

    // New watchpoint doesn't fit
    if (index == LLDB_INVALID_INDEX32)
    return LLDB_INVALID_INDEX32;


    // It fits, so we go ahead with updating the state of watch regs 
    DoWriteWatchPointRegisterValue(m_thread.GetID(), static_cast<void *>(&regs));

    // Storing exact address  
    hw_addr_map[index] = addr; 
    return index;
}

lldb::addr_t
NativeRegisterContextLinux_mips64::GetWatchpointAddress (uint32_t wp_index)
{
    if (wp_index >= NumSupportedHardwareWatchpoints())
        return LLDB_INVALID_ADDRESS;

    return hw_addr_map[wp_index];
}

struct EmulatorBaton
{
    lldb::addr_t m_watch_hit_addr;
    NativeProcessLinux* m_process;
    NativeRegisterContext* m_reg_context;

    EmulatorBaton(NativeProcessLinux* process, NativeRegisterContext* reg_context) :
            m_watch_hit_addr(LLDB_INVALID_ADDRESS), 
            m_process(process),
            m_reg_context(reg_context) 
            {}
};

static size_t
ReadMemoryCallback (EmulateInstruction *instruction, void *baton,
                    const EmulateInstruction::Context &context, lldb::addr_t addr, 
                    void *dst, size_t length)
{
    size_t bytes_read;
    EmulatorBaton* emulator_baton = static_cast<EmulatorBaton*>(baton);
    emulator_baton->m_process->ReadMemory(addr, dst, length, bytes_read);
    return bytes_read;
}

static size_t
WriteMemoryCallback (EmulateInstruction *instruction, void *baton,
                     const EmulateInstruction::Context &context, 
                     lldb::addr_t addr, const void *dst, size_t length)
{
    return length;
}

static bool
ReadRegisterCallback (EmulateInstruction *instruction, void *baton,
                      const RegisterInfo *reg_info, RegisterValue &reg_value)
{
    EmulatorBaton* emulator_baton = static_cast<EmulatorBaton*>(baton);

    const RegisterInfo* full_reg_info = emulator_baton->m_reg_context->GetRegisterInfo(
            lldb::eRegisterKindDWARF, reg_info->kinds[lldb::eRegisterKindDWARF]);

    Error error = emulator_baton->m_reg_context->ReadRegister(full_reg_info, reg_value);
    if (error.Success())
        return true;

    return false;
}

static bool
WriteRegisterCallback (EmulateInstruction *instruction, void *baton,
                       const EmulateInstruction::Context &context,
                       const RegisterInfo *reg_info, const RegisterValue &reg_value)
{
    if (reg_info->kinds[lldb::eRegisterKindDWARF] == dwarf_bad_mips64)
    {
        EmulatorBaton* emulator_baton = static_cast<EmulatorBaton*>(baton);
        emulator_baton->m_watch_hit_addr = reg_value.GetAsUInt64 ();
    }

    return true;
}

/*
 * MIPS Linux kernel returns a masked address (last 3bits are masked)
 * when a HW watchpoint is hit. However user may not have set a watchpoint
 * on this address. Emulate instruction at PC and find the base address of
 * the load/store instruction. This will give the exact address used to
 * read/write the variable. Send this exact address to client so that
 * it can decide to stop or continue the thread.
*/
lldb::addr_t
NativeRegisterContextLinux_mips64::GetWatchpointHitAddress (uint32_t wp_index)
{
    if (wp_index >= NumSupportedHardwareWatchpoints())
        return LLDB_INVALID_ADDRESS;

    lldb_private::ArchSpec arch;
    arch = GetRegisterInfoInterface().GetTargetArchitecture();
    std::unique_ptr<EmulateInstruction> emulator_ap(
        EmulateInstruction::FindPlugin(arch, lldb_private::eInstructionTypeAny, nullptr));

    if (emulator_ap == nullptr)
        return LLDB_INVALID_ADDRESS;
    
    EmulatorBaton baton(static_cast<NativeProcessLinux*>(m_thread.GetProcess().get()), this);
    emulator_ap->SetBaton (&baton);
    emulator_ap->SetReadMemCallback (&ReadMemoryCallback);
    emulator_ap->SetReadRegCallback (&ReadRegisterCallback);
    emulator_ap->SetWriteMemCallback (&WriteMemoryCallback);
    emulator_ap->SetWriteRegCallback (&WriteRegisterCallback);

    if (!emulator_ap->ReadInstruction())
        return LLDB_INVALID_ADDRESS;

    if (emulator_ap->EvaluateInstruction(lldb::eEmulateInstructionOptionNone))
        return baton.m_watch_hit_addr;

    return LLDB_INVALID_ADDRESS;
}

uint32_t
NativeRegisterContextLinux_mips64::NumSupportedHardwareWatchpoints ()
{
    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
    struct pt_watch_regs regs;
    static int num_valid = 0;
    if (!num_valid)
    {
        DoReadWatchPointRegisterValue(m_thread.GetID(), static_cast<void *>(&regs));
        default_watch_regs = regs; // Keeping default watch regs values for future use
        switch (regs.style)
        {
            case pt_watch_style_mips32:
                num_valid = regs.mips32.num_valid; // Using num_valid as cache
                return num_valid;
            case pt_watch_style_mips64:
                num_valid = regs.mips64.num_valid;
                return num_valid;
            default:
                if(log)
                    log->Printf("NativeRegisterContextLinux_mips64::%s Error: Unrecognized watch register style", __FUNCTION__);
        }
        return 0;
    }
    return num_valid;
}
Error
NativeRegisterContextLinux_mips64::DoReadRegisterValue(uint32_t offset,
                                                       const char* reg_name,
                                                       uint32_t size,
                                                       RegisterValue &value)
{
    GPR_linux_mips regs;
    ::memset(&regs, 0, sizeof(GPR_linux_mips));

    // Clear all bits in RegisterValue before writing actual value read from ptrace to avoid garbage value in 32-bit MSB 
    value.SetBytes((void *)(((unsigned char *)&regs) + offset), 8, GetByteOrder());
    Error error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGS, m_thread.GetID(), NULL, &regs, sizeof regs);
    if (error.Success())
    {
        lldb_private::ArchSpec arch;
        if (m_thread.GetProcess()->GetArchitecture(arch))
        {
            void* target_address = ((uint8_t*)&regs) + offset + 4 * (arch.GetMachine() == llvm::Triple::mips);
            uint32_t target_size;
            if ((::strcmp(reg_name, "sr") == 0) || (::strcmp(reg_name, "cause") == 0) || (::strcmp(reg_name, "config5") == 0))
                target_size = 4;
            else
                target_size = arch.GetFlags() & lldb_private::ArchSpec::eMIPSABI_O32 ? 4 : 8;
            value.SetBytes(target_address, target_size, arch.GetByteOrder());
        }
        else
            error.SetErrorString("failed to get architecture");
    }
    return error;
}

Error
NativeRegisterContextLinux_mips64::DoWriteRegisterValue(uint32_t offset,
                                                        const char* reg_name,
                                                        const RegisterValue &value)
{
    GPR_linux_mips regs;
    Error error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGS, m_thread.GetID(), NULL, &regs, sizeof regs);
    if (error.Success())
    {
        lldb_private::ArchSpec arch;
        if (m_thread.GetProcess()->GetArchitecture(arch))
        {
            ::memcpy((void *)(((unsigned char *)(&regs)) + offset), value.GetBytes(), arch.GetFlags() & lldb_private::ArchSpec::eMIPSABI_O32 ? 4 : 8);
            error = NativeProcessLinux::PtraceWrapper(PTRACE_SETREGS, m_thread.GetID(), NULL, &regs, sizeof regs);
        }
        else
            error.SetErrorString("failed to get architecture");
    }
    return error;
}

Error
NativeRegisterContextLinux_mips64::DoReadWatchPointRegisterValue(lldb::tid_t tid, void* watch_readback)
{
    return NativeProcessLinux::PtraceWrapper( PTRACE_GET_WATCH_REGS, m_thread.GetID(), watch_readback);
}

Error
NativeRegisterContextLinux_mips64::DoWriteWatchPointRegisterValue(lldb::tid_t tid, void* watch_reg_value)
{
    return NativeProcessLinux::PtraceWrapper(PTRACE_SET_WATCH_REGS, m_thread.GetID(), watch_reg_value);
}

#endif // defined (__mips__)