//===-- RegisterContextPOSIX_mips64.cpp -------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include <cstring>
#include <errno.h>
#include <stdint.h>

#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/RegisterValue.h"
#include "lldb/Core/Scalar.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Host/Endian.h"
#include "llvm/Support/Compiler.h"

#include "RegisterContextPOSIX_mips64.h"
#include "Plugins/Process/elf-core/ProcessElfCore.h"

using namespace lldb_private;
using namespace lldb;

static const
uint32_t g_gpr_regnums[] =
{
    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_ic_mips64,
    gpr_dummy_mips64
};

// Number of register sets provided by this context.
enum
{
    k_num_register_sets = 1
};

static const RegisterSet
g_reg_sets_mips64[k_num_register_sets] =
{
    { "General Purpose Registers",  "gpr", k_num_gpr_registers_mips64, g_gpr_regnums },
};

bool RegisterContextPOSIX_mips64::IsGPR(unsigned reg)
{
    return reg <= k_num_gpr_registers_mips64;   // GPR's come first.
}

bool
RegisterContextPOSIX_mips64::IsFPR(unsigned reg)
{
    // XXX
    return false;
}

RegisterContextPOSIX_mips64::RegisterContextPOSIX_mips64(Thread &thread,
                                               uint32_t concrete_frame_idx,
                                               RegisterInfoInterface *register_info)
    : RegisterContext(thread, concrete_frame_idx)
{
    m_register_info_ap.reset(register_info);

    // elf-core yet to support ReadFPR()
    ProcessSP base = CalculateProcess();
    if (base.get()->GetPluginName() ==  ProcessElfCore::GetPluginNameStatic())
        return;
}

RegisterContextPOSIX_mips64::~RegisterContextPOSIX_mips64()
{
}

void
RegisterContextPOSIX_mips64::Invalidate()
{
}

void
RegisterContextPOSIX_mips64::InvalidateAllRegisters()
{
}

unsigned
RegisterContextPOSIX_mips64::GetRegisterOffset(unsigned reg)
{
    assert(reg < k_num_registers_mips64 && "Invalid register number.");
    return GetRegisterInfo()[reg].byte_offset;
}

unsigned
RegisterContextPOSIX_mips64::GetRegisterSize(unsigned reg)
{
    assert(reg < k_num_registers_mips64 && "Invalid register number.");
    return GetRegisterInfo()[reg].byte_size;
}

size_t
RegisterContextPOSIX_mips64::GetRegisterCount()
{
    size_t num_registers = k_num_registers_mips64;
    return num_registers;
}

size_t
RegisterContextPOSIX_mips64::GetGPRSize()
{
    return m_register_info_ap->GetGPRSize();
}

const RegisterInfo *
RegisterContextPOSIX_mips64::GetRegisterInfo()
{
    // Commonly, this method is overridden and g_register_infos is copied and specialized.
    // So, use GetRegisterInfo() rather than g_register_infos in this scope.
    return m_register_info_ap->GetRegisterInfo ();
}

const RegisterInfo *
RegisterContextPOSIX_mips64::GetRegisterInfoAtIndex(size_t reg)
{
    if (reg < k_num_registers_mips64)
        return &GetRegisterInfo()[reg];
    else
        return NULL;
}

size_t
RegisterContextPOSIX_mips64::GetRegisterSetCount()
{
    size_t sets = 0;
    for (size_t set = 0; set < k_num_register_sets; ++set)
    {
        if (IsRegisterSetAvailable(set))
            ++sets;
    }

    return sets;
}

const RegisterSet *
RegisterContextPOSIX_mips64::GetRegisterSet(size_t set)
{
    if (IsRegisterSetAvailable(set))
        return &g_reg_sets_mips64[set];
    else
        return NULL;
}

const char *
RegisterContextPOSIX_mips64::GetRegisterName(unsigned reg)
{
    assert(reg < k_num_registers_mips64 && "Invalid register offset.");
    return GetRegisterInfo()[reg].name;
}

lldb::ByteOrder
RegisterContextPOSIX_mips64::GetByteOrder()
{
    // Get the target process whose privileged thread was used for the register read.
    lldb::ByteOrder byte_order = eByteOrderInvalid;
    Process *process = CalculateProcess().get();

    if (process)
        byte_order = process->GetByteOrder();
    return byte_order;
}

bool
RegisterContextPOSIX_mips64::IsRegisterSetAvailable(size_t set_index)
{
    size_t num_sets = k_num_register_sets;

    return (set_index < num_sets);
}

// Used when parsing DWARF and EH frame information and any other
// object file sections that contain register numbers in them.
uint32_t
RegisterContextPOSIX_mips64::ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,
                                                                 uint32_t num)
{
    const uint32_t num_regs = GetRegisterCount();

    assert (kind < kNumRegisterKinds);
    for (uint32_t reg_idx = 0; reg_idx < num_regs; ++reg_idx)
    {
        const RegisterInfo *reg_info = GetRegisterInfoAtIndex (reg_idx);

        if (reg_info->kinds[kind] == num)
            return reg_idx;
    }

    return LLDB_INVALID_REGNUM;
}