//===-- RegisterContextDarwin_arm.cpp -------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "RegisterContextDarwin_arm.h"
#include "RegisterContextDarwinConstants.h"

#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegisterValue.h"
#include "lldb/Utility/Scalar.h"
#include "llvm/Support/Compiler.h"

#include "Plugins/Process/Utility/InstructionUtils.h"

#include <memory>

#include "Utility/ARM_DWARF_Registers.h"
#include "Utility/ARM_ehframe_Registers.h"

#include "llvm/ADT/STLExtras.h"

using namespace lldb;
using namespace lldb_private;

enum {
  gpr_r0 = 0,
  gpr_r1,
  gpr_r2,
  gpr_r3,
  gpr_r4,
  gpr_r5,
  gpr_r6,
  gpr_r7,
  gpr_r8,
  gpr_r9,
  gpr_r10,
  gpr_r11,
  gpr_r12,
  gpr_r13,
  gpr_sp = gpr_r13,
  gpr_r14,
  gpr_lr = gpr_r14,
  gpr_r15,
  gpr_pc = gpr_r15,
  gpr_cpsr,

  fpu_s0,
  fpu_s1,
  fpu_s2,
  fpu_s3,
  fpu_s4,
  fpu_s5,
  fpu_s6,
  fpu_s7,
  fpu_s8,
  fpu_s9,
  fpu_s10,
  fpu_s11,
  fpu_s12,
  fpu_s13,
  fpu_s14,
  fpu_s15,
  fpu_s16,
  fpu_s17,
  fpu_s18,
  fpu_s19,
  fpu_s20,
  fpu_s21,
  fpu_s22,
  fpu_s23,
  fpu_s24,
  fpu_s25,
  fpu_s26,
  fpu_s27,
  fpu_s28,
  fpu_s29,
  fpu_s30,
  fpu_s31,
  fpu_fpscr,

  exc_exception,
  exc_fsr,
  exc_far,

  dbg_bvr0,
  dbg_bvr1,
  dbg_bvr2,
  dbg_bvr3,
  dbg_bvr4,
  dbg_bvr5,
  dbg_bvr6,
  dbg_bvr7,
  dbg_bvr8,
  dbg_bvr9,
  dbg_bvr10,
  dbg_bvr11,
  dbg_bvr12,
  dbg_bvr13,
  dbg_bvr14,
  dbg_bvr15,

  dbg_bcr0,
  dbg_bcr1,
  dbg_bcr2,
  dbg_bcr3,
  dbg_bcr4,
  dbg_bcr5,
  dbg_bcr6,
  dbg_bcr7,
  dbg_bcr8,
  dbg_bcr9,
  dbg_bcr10,
  dbg_bcr11,
  dbg_bcr12,
  dbg_bcr13,
  dbg_bcr14,
  dbg_bcr15,

  dbg_wvr0,
  dbg_wvr1,
  dbg_wvr2,
  dbg_wvr3,
  dbg_wvr4,
  dbg_wvr5,
  dbg_wvr6,
  dbg_wvr7,
  dbg_wvr8,
  dbg_wvr9,
  dbg_wvr10,
  dbg_wvr11,
  dbg_wvr12,
  dbg_wvr13,
  dbg_wvr14,
  dbg_wvr15,

  dbg_wcr0,
  dbg_wcr1,
  dbg_wcr2,
  dbg_wcr3,
  dbg_wcr4,
  dbg_wcr5,
  dbg_wcr6,
  dbg_wcr7,
  dbg_wcr8,
  dbg_wcr9,
  dbg_wcr10,
  dbg_wcr11,
  dbg_wcr12,
  dbg_wcr13,
  dbg_wcr14,
  dbg_wcr15,

  k_num_registers
};

#define GPR_OFFSET(idx) ((idx)*4)
#define FPU_OFFSET(idx) ((idx)*4 + sizeof(RegisterContextDarwin_arm::GPR))
#define EXC_OFFSET(idx)                                                        \
  ((idx)*4 + sizeof(RegisterContextDarwin_arm::GPR) +                          \
   sizeof(RegisterContextDarwin_arm::FPU))
#define DBG_OFFSET(reg)                                                        \
  ((LLVM_EXTENSION offsetof(RegisterContextDarwin_arm::DBG, reg) +             \
    sizeof(RegisterContextDarwin_arm::GPR) +                                   \
    sizeof(RegisterContextDarwin_arm::FPU) +                                   \
    sizeof(RegisterContextDarwin_arm::EXC)))

#define DEFINE_DBG(reg, i)                                                     \
  #reg, NULL, sizeof(((RegisterContextDarwin_arm::DBG *) NULL)->reg[i]),       \
                      DBG_OFFSET(reg[i]), eEncodingUint, eFormatHex,           \
                                 {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,    \
                                  LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,    \
                                  LLDB_INVALID_REGNUM },                       \
                                  nullptr, nullptr,
#define REG_CONTEXT_SIZE                                                       \
  (sizeof(RegisterContextDarwin_arm::GPR) +                                    \
   sizeof(RegisterContextDarwin_arm::FPU) +                                    \
   sizeof(RegisterContextDarwin_arm::EXC))

static RegisterInfo g_register_infos[] = {
    // General purpose registers
    //  NAME        ALT     SZ  OFFSET              ENCODING        FORMAT
    //  EH_FRAME                DWARF               GENERIC
    //  PROCESS PLUGIN          LLDB NATIVE
    //  ======      ======= ==  =============       =============   ============
    //  ===============         ===============     =========================
    //  =====================   =============
    {"r0",
     nullptr,
     4,
     GPR_OFFSET(0),
     eEncodingUint,
     eFormatHex,
     {ehframe_r0, dwarf_r0, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r0},
     nullptr,
     nullptr,
    },
    {"r1",
     nullptr,
     4,
     GPR_OFFSET(1),
     eEncodingUint,
     eFormatHex,
     {ehframe_r1, dwarf_r1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r1},
     nullptr,
     nullptr,
    },
    {"r2",
     nullptr,
     4,
     GPR_OFFSET(2),
     eEncodingUint,
     eFormatHex,
     {ehframe_r2, dwarf_r2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r2},
     nullptr,
     nullptr,
    },
    {"r3",
     nullptr,
     4,
     GPR_OFFSET(3),
     eEncodingUint,
     eFormatHex,
     {ehframe_r3, dwarf_r3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r3},
     nullptr,
     nullptr,
    },
    {"r4",
     nullptr,
     4,
     GPR_OFFSET(4),
     eEncodingUint,
     eFormatHex,
     {ehframe_r4, dwarf_r4, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r4},
     nullptr,
     nullptr,
    },
    {"r5",
     nullptr,
     4,
     GPR_OFFSET(5),
     eEncodingUint,
     eFormatHex,
     {ehframe_r5, dwarf_r5, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r5},
     nullptr,
     nullptr,
    },
    {"r6",
     nullptr,
     4,
     GPR_OFFSET(6),
     eEncodingUint,
     eFormatHex,
     {ehframe_r6, dwarf_r6, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r6},
     nullptr,
     nullptr,
    },
    {"r7",
     nullptr,
     4,
     GPR_OFFSET(7),
     eEncodingUint,
     eFormatHex,
     {ehframe_r7, dwarf_r7, LLDB_REGNUM_GENERIC_FP, LLDB_INVALID_REGNUM,
      gpr_r7},
     nullptr,
     nullptr,
    },
    {"r8",
     nullptr,
     4,
     GPR_OFFSET(8),
     eEncodingUint,
     eFormatHex,
     {ehframe_r8, dwarf_r8, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r8},
     nullptr,
     nullptr,
    },
    {"r9",
     nullptr,
     4,
     GPR_OFFSET(9),
     eEncodingUint,
     eFormatHex,
     {ehframe_r9, dwarf_r9, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, gpr_r9},
     nullptr,
     nullptr,
    },
    {"r10",
     nullptr,
     4,
     GPR_OFFSET(10),
     eEncodingUint,
     eFormatHex,
     {ehframe_r10, dwarf_r10, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      gpr_r10},
     nullptr,
     nullptr,
    },
    {"r11",
     nullptr,
     4,
     GPR_OFFSET(11),
     eEncodingUint,
     eFormatHex,
     {ehframe_r11, dwarf_r11, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      gpr_r11},
     nullptr,
     nullptr,
    },
    {"r12",
     nullptr,
     4,
     GPR_OFFSET(12),
     eEncodingUint,
     eFormatHex,
     {ehframe_r12, dwarf_r12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      gpr_r12},
     nullptr,
     nullptr,
    },
    {"sp",
     "r13",
     4,
     GPR_OFFSET(13),
     eEncodingUint,
     eFormatHex,
     {ehframe_sp, dwarf_sp, LLDB_REGNUM_GENERIC_SP, LLDB_INVALID_REGNUM,
      gpr_sp},
     nullptr,
     nullptr,
    },
    {"lr",
     "r14",
     4,
     GPR_OFFSET(14),
     eEncodingUint,
     eFormatHex,
     {ehframe_lr, dwarf_lr, LLDB_REGNUM_GENERIC_RA, LLDB_INVALID_REGNUM,
      gpr_lr},
     nullptr,
     nullptr,
    },
    {"pc",
     "r15",
     4,
     GPR_OFFSET(15),
     eEncodingUint,
     eFormatHex,
     {ehframe_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_REGNUM,
      gpr_pc},
     nullptr,
     nullptr,
    },
    {"cpsr",
     "psr",
     4,
     GPR_OFFSET(16),
     eEncodingUint,
     eFormatHex,
     {ehframe_cpsr, dwarf_cpsr, LLDB_REGNUM_GENERIC_FLAGS, LLDB_INVALID_REGNUM,
      gpr_cpsr},
     nullptr,
     nullptr,
    },

    {"s0",
     nullptr,
     4,
     FPU_OFFSET(0),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s0, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s0},
     nullptr,
     nullptr,
    },
    {"s1",
     nullptr,
     4,
     FPU_OFFSET(1),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s1},
     nullptr,
     nullptr,
    },
    {"s2",
     nullptr,
     4,
     FPU_OFFSET(2),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s2},
     nullptr,
     nullptr,
    },
    {"s3",
     nullptr,
     4,
     FPU_OFFSET(3),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s3},
     nullptr,
     nullptr,
    },
    {"s4",
     nullptr,
     4,
     FPU_OFFSET(4),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s4, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s4},
     nullptr,
     nullptr,
    },
    {"s5",
     nullptr,
     4,
     FPU_OFFSET(5),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s5, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s5},
     nullptr,
     nullptr,
    },
    {"s6",
     nullptr,
     4,
     FPU_OFFSET(6),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s6, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s6},
     nullptr,
     nullptr,
    },
    {"s7",
     nullptr,
     4,
     FPU_OFFSET(7),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s7, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s7},
     nullptr,
     nullptr,
    },
    {"s8",
     nullptr,
     4,
     FPU_OFFSET(8),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s8, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s8},
     nullptr,
     nullptr,
    },
    {"s9",
     nullptr,
     4,
     FPU_OFFSET(9),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s9, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s9},
     nullptr,
     nullptr,
    },
    {"s10",
     nullptr,
     4,
     FPU_OFFSET(10),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s10, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s10},
     nullptr,
     nullptr,
    },
    {"s11",
     nullptr,
     4,
     FPU_OFFSET(11),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s11, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s11},
     nullptr,
     nullptr,
    },
    {"s12",
     nullptr,
     4,
     FPU_OFFSET(12),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s12},
     nullptr,
     nullptr,
    },
    {"s13",
     nullptr,
     4,
     FPU_OFFSET(13),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s13, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s13},
     nullptr,
     nullptr,
    },
    {"s14",
     nullptr,
     4,
     FPU_OFFSET(14),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s14, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s14},
     nullptr,
     nullptr,
    },
    {"s15",
     nullptr,
     4,
     FPU_OFFSET(15),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s15, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s15},
     nullptr,
     nullptr,
    },
    {"s16",
     nullptr,
     4,
     FPU_OFFSET(16),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s16, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s16},
     nullptr,
     nullptr,
    },
    {"s17",
     nullptr,
     4,
     FPU_OFFSET(17),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s17, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s17},
     nullptr,
     nullptr,
    },
    {"s18",
     nullptr,
     4,
     FPU_OFFSET(18),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s18, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s18},
     nullptr,
     nullptr,
    },
    {"s19",
     nullptr,
     4,
     FPU_OFFSET(19),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s19, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s19},
     nullptr,
     nullptr,
    },
    {"s20",
     nullptr,
     4,
     FPU_OFFSET(20),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s20, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s20},
     nullptr,
     nullptr,
    },
    {"s21",
     nullptr,
     4,
     FPU_OFFSET(21),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s21, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s21},
     nullptr,
     nullptr,
    },
    {"s22",
     nullptr,
     4,
     FPU_OFFSET(22),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s22, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s22},
     nullptr,
     nullptr,
    },
    {"s23",
     nullptr,
     4,
     FPU_OFFSET(23),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s23, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s23},
     nullptr,
     nullptr,
    },
    {"s24",
     nullptr,
     4,
     FPU_OFFSET(24),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s24, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s24},
     nullptr,
     nullptr,
    },
    {"s25",
     nullptr,
     4,
     FPU_OFFSET(25),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s25, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s25},
     nullptr,
     nullptr,
    },
    {"s26",
     nullptr,
     4,
     FPU_OFFSET(26),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s26, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s26},
     nullptr,
     nullptr,
    },
    {"s27",
     nullptr,
     4,
     FPU_OFFSET(27),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s27, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s27},
     nullptr,
     nullptr,
    },
    {"s28",
     nullptr,
     4,
     FPU_OFFSET(28),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s28, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s28},
     nullptr,
     nullptr,
    },
    {"s29",
     nullptr,
     4,
     FPU_OFFSET(29),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s29, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s29},
     nullptr,
     nullptr,
    },
    {"s30",
     nullptr,
     4,
     FPU_OFFSET(30),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s30, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s30},
     nullptr,
     nullptr,
    },
    {"s31",
     nullptr,
     4,
     FPU_OFFSET(31),
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s31, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      fpu_s31},
     nullptr,
     nullptr,
    },
    {"fpscr",
     nullptr,
     4,
     FPU_OFFSET(32),
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_fpscr},
     nullptr,
     nullptr,
    },

    {"exception",
     nullptr,
     4,
     EXC_OFFSET(0),
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, exc_exception},
     nullptr,
     nullptr,
    },
    {"fsr",
     nullptr,
     4,
     EXC_OFFSET(1),
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, exc_fsr},
     nullptr,
     nullptr,
    },
    {"far",
     nullptr,
     4,
     EXC_OFFSET(2),
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, exc_far},
     nullptr,
     nullptr,
    },

    {DEFINE_DBG(bvr, 0)},
    {DEFINE_DBG(bvr, 1)},
    {DEFINE_DBG(bvr, 2)},
    {DEFINE_DBG(bvr, 3)},
    {DEFINE_DBG(bvr, 4)},
    {DEFINE_DBG(bvr, 5)},
    {DEFINE_DBG(bvr, 6)},
    {DEFINE_DBG(bvr, 7)},
    {DEFINE_DBG(bvr, 8)},
    {DEFINE_DBG(bvr, 9)},
    {DEFINE_DBG(bvr, 10)},
    {DEFINE_DBG(bvr, 11)},
    {DEFINE_DBG(bvr, 12)},
    {DEFINE_DBG(bvr, 13)},
    {DEFINE_DBG(bvr, 14)},
    {DEFINE_DBG(bvr, 15)},

    {DEFINE_DBG(bcr, 0)},
    {DEFINE_DBG(bcr, 1)},
    {DEFINE_DBG(bcr, 2)},
    {DEFINE_DBG(bcr, 3)},
    {DEFINE_DBG(bcr, 4)},
    {DEFINE_DBG(bcr, 5)},
    {DEFINE_DBG(bcr, 6)},
    {DEFINE_DBG(bcr, 7)},
    {DEFINE_DBG(bcr, 8)},
    {DEFINE_DBG(bcr, 9)},
    {DEFINE_DBG(bcr, 10)},
    {DEFINE_DBG(bcr, 11)},
    {DEFINE_DBG(bcr, 12)},
    {DEFINE_DBG(bcr, 13)},
    {DEFINE_DBG(bcr, 14)},
    {DEFINE_DBG(bcr, 15)},

    {DEFINE_DBG(wvr, 0)},
    {DEFINE_DBG(wvr, 1)},
    {DEFINE_DBG(wvr, 2)},
    {DEFINE_DBG(wvr, 3)},
    {DEFINE_DBG(wvr, 4)},
    {DEFINE_DBG(wvr, 5)},
    {DEFINE_DBG(wvr, 6)},
    {DEFINE_DBG(wvr, 7)},
    {DEFINE_DBG(wvr, 8)},
    {DEFINE_DBG(wvr, 9)},
    {DEFINE_DBG(wvr, 10)},
    {DEFINE_DBG(wvr, 11)},
    {DEFINE_DBG(wvr, 12)},
    {DEFINE_DBG(wvr, 13)},
    {DEFINE_DBG(wvr, 14)},
    {DEFINE_DBG(wvr, 15)},

    {DEFINE_DBG(wcr, 0)},
    {DEFINE_DBG(wcr, 1)},
    {DEFINE_DBG(wcr, 2)},
    {DEFINE_DBG(wcr, 3)},
    {DEFINE_DBG(wcr, 4)},
    {DEFINE_DBG(wcr, 5)},
    {DEFINE_DBG(wcr, 6)},
    {DEFINE_DBG(wcr, 7)},
    {DEFINE_DBG(wcr, 8)},
    {DEFINE_DBG(wcr, 9)},
    {DEFINE_DBG(wcr, 10)},
    {DEFINE_DBG(wcr, 11)},
    {DEFINE_DBG(wcr, 12)},
    {DEFINE_DBG(wcr, 13)},
    {DEFINE_DBG(wcr, 14)},
    {DEFINE_DBG(wcr, 15)}};

// General purpose registers
static uint32_t g_gpr_regnums[] = {
    gpr_r0, gpr_r1,  gpr_r2,  gpr_r3,  gpr_r4, gpr_r5, gpr_r6, gpr_r7,  gpr_r8,
    gpr_r9, gpr_r10, gpr_r11, gpr_r12, gpr_sp, gpr_lr, gpr_pc, gpr_cpsr};

// Floating point registers
static uint32_t g_fpu_regnums[] = {
    fpu_s0,  fpu_s1,  fpu_s2,  fpu_s3,  fpu_s4,    fpu_s5,  fpu_s6,
    fpu_s7,  fpu_s8,  fpu_s9,  fpu_s10, fpu_s11,   fpu_s12, fpu_s13,
    fpu_s14, fpu_s15, fpu_s16, fpu_s17, fpu_s18,   fpu_s19, fpu_s20,
    fpu_s21, fpu_s22, fpu_s23, fpu_s24, fpu_s25,   fpu_s26, fpu_s27,
    fpu_s28, fpu_s29, fpu_s30, fpu_s31, fpu_fpscr,
};

// Exception registers

static uint32_t g_exc_regnums[] = {
    exc_exception, exc_fsr, exc_far,
};

static size_t k_num_register_infos = llvm::array_lengthof(g_register_infos);

RegisterContextDarwin_arm::RegisterContextDarwin_arm(
    Thread &thread, uint32_t concrete_frame_idx)
    : RegisterContext(thread, concrete_frame_idx), gpr(), fpu(), exc() {
  uint32_t i;
  for (i = 0; i < kNumErrors; i++) {
    gpr_errs[i] = -1;
    fpu_errs[i] = -1;
    exc_errs[i] = -1;
  }
}

RegisterContextDarwin_arm::~RegisterContextDarwin_arm() = default;

void RegisterContextDarwin_arm::InvalidateAllRegisters() {
  InvalidateAllRegisterStates();
}

size_t RegisterContextDarwin_arm::GetRegisterCount() {
  assert(k_num_register_infos == k_num_registers);
  return k_num_registers;
}

const RegisterInfo *
RegisterContextDarwin_arm::GetRegisterInfoAtIndex(size_t reg) {
  assert(k_num_register_infos == k_num_registers);
  if (reg < k_num_registers)
    return &g_register_infos[reg];
  return nullptr;
}

size_t RegisterContextDarwin_arm::GetRegisterInfosCount() {
  return k_num_register_infos;
}

const RegisterInfo *RegisterContextDarwin_arm::GetRegisterInfos() {
  return g_register_infos;
}

// Number of registers in each register set
const size_t k_num_gpr_registers = llvm::array_lengthof(g_gpr_regnums);
const size_t k_num_fpu_registers = llvm::array_lengthof(g_fpu_regnums);
const size_t k_num_exc_registers = llvm::array_lengthof(g_exc_regnums);

// Register set definitions. The first definitions at register set index of
// zero is for all registers, followed by other registers sets. The register
// information for the all register set need not be filled in.
static const RegisterSet g_reg_sets[] = {
    {
        "General Purpose Registers", "gpr", k_num_gpr_registers, g_gpr_regnums,
    },
    {"Floating Point Registers", "fpu", k_num_fpu_registers, g_fpu_regnums},
    {"Exception State Registers", "exc", k_num_exc_registers, g_exc_regnums}};

const size_t k_num_regsets = llvm::array_lengthof(g_reg_sets);

size_t RegisterContextDarwin_arm::GetRegisterSetCount() {
  return k_num_regsets;
}

const RegisterSet *RegisterContextDarwin_arm::GetRegisterSet(size_t reg_set) {
  if (reg_set < k_num_regsets)
    return &g_reg_sets[reg_set];
  return nullptr;
}

// Register information definitions for 32 bit i386.
int RegisterContextDarwin_arm::GetSetForNativeRegNum(int reg) {
  if (reg < fpu_s0)
    return GPRRegSet;
  else if (reg < exc_exception)
    return FPURegSet;
  else if (reg < k_num_registers)
    return EXCRegSet;
  return -1;
}

int RegisterContextDarwin_arm::ReadGPR(bool force) {
  int set = GPRRegSet;
  if (force || !RegisterSetIsCached(set)) {
    SetError(set, Read, DoReadGPR(GetThreadID(), set, gpr));
  }
  return GetError(GPRRegSet, Read);
}

int RegisterContextDarwin_arm::ReadFPU(bool force) {
  int set = FPURegSet;
  if (force || !RegisterSetIsCached(set)) {
    SetError(set, Read, DoReadFPU(GetThreadID(), set, fpu));
  }
  return GetError(FPURegSet, Read);
}

int RegisterContextDarwin_arm::ReadEXC(bool force) {
  int set = EXCRegSet;
  if (force || !RegisterSetIsCached(set)) {
    SetError(set, Read, DoReadEXC(GetThreadID(), set, exc));
  }
  return GetError(EXCRegSet, Read);
}

int RegisterContextDarwin_arm::ReadDBG(bool force) {
  int set = DBGRegSet;
  if (force || !RegisterSetIsCached(set)) {
    SetError(set, Read, DoReadDBG(GetThreadID(), set, dbg));
  }
  return GetError(DBGRegSet, Read);
}

int RegisterContextDarwin_arm::WriteGPR() {
  int set = GPRRegSet;
  if (!RegisterSetIsCached(set)) {
    SetError(set, Write, -1);
    return KERN_INVALID_ARGUMENT;
  }
  SetError(set, Write, DoWriteGPR(GetThreadID(), set, gpr));
  SetError(set, Read, -1);
  return GetError(GPRRegSet, Write);
}

int RegisterContextDarwin_arm::WriteFPU() {
  int set = FPURegSet;
  if (!RegisterSetIsCached(set)) {
    SetError(set, Write, -1);
    return KERN_INVALID_ARGUMENT;
  }
  SetError(set, Write, DoWriteFPU(GetThreadID(), set, fpu));
  SetError(set, Read, -1);
  return GetError(FPURegSet, Write);
}

int RegisterContextDarwin_arm::WriteEXC() {
  int set = EXCRegSet;
  if (!RegisterSetIsCached(set)) {
    SetError(set, Write, -1);
    return KERN_INVALID_ARGUMENT;
  }
  SetError(set, Write, DoWriteEXC(GetThreadID(), set, exc));
  SetError(set, Read, -1);
  return GetError(EXCRegSet, Write);
}

int RegisterContextDarwin_arm::WriteDBG() {
  int set = DBGRegSet;
  if (!RegisterSetIsCached(set)) {
    SetError(set, Write, -1);
    return KERN_INVALID_ARGUMENT;
  }
  SetError(set, Write, DoWriteDBG(GetThreadID(), set, dbg));
  SetError(set, Read, -1);
  return GetError(DBGRegSet, Write);
}

int RegisterContextDarwin_arm::ReadRegisterSet(uint32_t set, bool force) {
  switch (set) {
  case GPRRegSet:
    return ReadGPR(force);
  case GPRAltRegSet:
    return ReadGPR(force);
  case FPURegSet:
    return ReadFPU(force);
  case EXCRegSet:
    return ReadEXC(force);
  case DBGRegSet:
    return ReadDBG(force);
  default:
    break;
  }
  return KERN_INVALID_ARGUMENT;
}

int RegisterContextDarwin_arm::WriteRegisterSet(uint32_t set) {
  // Make sure we have a valid context to set.
  if (RegisterSetIsCached(set)) {
    switch (set) {
    case GPRRegSet:
      return WriteGPR();
    case GPRAltRegSet:
      return WriteGPR();
    case FPURegSet:
      return WriteFPU();
    case EXCRegSet:
      return WriteEXC();
    case DBGRegSet:
      return WriteDBG();
    default:
      break;
    }
  }
  return KERN_INVALID_ARGUMENT;
}

void RegisterContextDarwin_arm::LogDBGRegisters(Log *log, const DBG &dbg) {
  if (log) {
    for (uint32_t i = 0; i < 16; i++)
      LLDB_LOGF(log,
                "BVR%-2u/BCR%-2u = { 0x%8.8x, 0x%8.8x } WVR%-2u/WCR%-2u = { "
                "0x%8.8x, 0x%8.8x }",
                i, i, dbg.bvr[i], dbg.bcr[i], i, i, dbg.wvr[i], dbg.wcr[i]);
  }
}

bool RegisterContextDarwin_arm::ReadRegister(const RegisterInfo *reg_info,
                                             RegisterValue &value) {
  const uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
  int set = RegisterContextDarwin_arm::GetSetForNativeRegNum(reg);

  if (set == -1)
    return false;

  if (ReadRegisterSet(set, false) != KERN_SUCCESS)
    return false;

  switch (reg) {
  case gpr_r0:
  case gpr_r1:
  case gpr_r2:
  case gpr_r3:
  case gpr_r4:
  case gpr_r5:
  case gpr_r6:
  case gpr_r7:
  case gpr_r8:
  case gpr_r9:
  case gpr_r10:
  case gpr_r11:
  case gpr_r12:
  case gpr_sp:
  case gpr_lr:
  case gpr_pc:
    value.SetUInt32(gpr.r[reg - gpr_r0]);
    break;
  case gpr_cpsr:
    value.SetUInt32(gpr.cpsr);
    break;
  case fpu_s0:
  case fpu_s1:
  case fpu_s2:
  case fpu_s3:
  case fpu_s4:
  case fpu_s5:
  case fpu_s6:
  case fpu_s7:
  case fpu_s8:
  case fpu_s9:
  case fpu_s10:
  case fpu_s11:
  case fpu_s12:
  case fpu_s13:
  case fpu_s14:
  case fpu_s15:
  case fpu_s16:
  case fpu_s17:
  case fpu_s18:
  case fpu_s19:
  case fpu_s20:
  case fpu_s21:
  case fpu_s22:
  case fpu_s23:
  case fpu_s24:
  case fpu_s25:
  case fpu_s26:
  case fpu_s27:
  case fpu_s28:
  case fpu_s29:
  case fpu_s30:
  case fpu_s31:
    value.SetUInt32(fpu.floats.s[reg], RegisterValue::eTypeFloat);
    break;

  case fpu_fpscr:
    value.SetUInt32(fpu.fpscr);
    break;

  case exc_exception:
    value.SetUInt32(exc.exception);
    break;
  case exc_fsr:
    value.SetUInt32(exc.fsr);
    break;
  case exc_far:
    value.SetUInt32(exc.far);
    break;

  default:
    value.SetValueToInvalid();
    return false;
  }
  return true;
}

bool RegisterContextDarwin_arm::WriteRegister(const RegisterInfo *reg_info,
                                              const RegisterValue &value) {
  const uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
  int set = GetSetForNativeRegNum(reg);

  if (set == -1)
    return false;

  if (ReadRegisterSet(set, false) != KERN_SUCCESS)
    return false;

  switch (reg) {
  case gpr_r0:
  case gpr_r1:
  case gpr_r2:
  case gpr_r3:
  case gpr_r4:
  case gpr_r5:
  case gpr_r6:
  case gpr_r7:
  case gpr_r8:
  case gpr_r9:
  case gpr_r10:
  case gpr_r11:
  case gpr_r12:
  case gpr_sp:
  case gpr_lr:
  case gpr_pc:
  case gpr_cpsr:
    gpr.r[reg - gpr_r0] = value.GetAsUInt32();
    break;

  case fpu_s0:
  case fpu_s1:
  case fpu_s2:
  case fpu_s3:
  case fpu_s4:
  case fpu_s5:
  case fpu_s6:
  case fpu_s7:
  case fpu_s8:
  case fpu_s9:
  case fpu_s10:
  case fpu_s11:
  case fpu_s12:
  case fpu_s13:
  case fpu_s14:
  case fpu_s15:
  case fpu_s16:
  case fpu_s17:
  case fpu_s18:
  case fpu_s19:
  case fpu_s20:
  case fpu_s21:
  case fpu_s22:
  case fpu_s23:
  case fpu_s24:
  case fpu_s25:
  case fpu_s26:
  case fpu_s27:
  case fpu_s28:
  case fpu_s29:
  case fpu_s30:
  case fpu_s31:
    fpu.floats.s[reg] = value.GetAsUInt32();
    break;

  case fpu_fpscr:
    fpu.fpscr = value.GetAsUInt32();
    break;

  case exc_exception:
    exc.exception = value.GetAsUInt32();
    break;
  case exc_fsr:
    exc.fsr = value.GetAsUInt32();
    break;
  case exc_far:
    exc.far = value.GetAsUInt32();
    break;

  default:
    return false;
  }
  return WriteRegisterSet(set) == KERN_SUCCESS;
}

bool RegisterContextDarwin_arm::ReadAllRegisterValues(
    lldb::DataBufferSP &data_sp) {
  data_sp = std::make_shared<DataBufferHeap>(REG_CONTEXT_SIZE, 0);
  if (data_sp && ReadGPR(false) == KERN_SUCCESS &&
      ReadFPU(false) == KERN_SUCCESS && ReadEXC(false) == KERN_SUCCESS) {
    uint8_t *dst = data_sp->GetBytes();
    ::memcpy(dst, &gpr, sizeof(gpr));
    dst += sizeof(gpr);

    ::memcpy(dst, &fpu, sizeof(fpu));
    dst += sizeof(gpr);

    ::memcpy(dst, &exc, sizeof(exc));
    return true;
  }
  return false;
}

bool RegisterContextDarwin_arm::WriteAllRegisterValues(
    const lldb::DataBufferSP &data_sp) {
  if (data_sp && data_sp->GetByteSize() == REG_CONTEXT_SIZE) {
    const uint8_t *src = data_sp->GetBytes();
    ::memcpy(&gpr, src, sizeof(gpr));
    src += sizeof(gpr);

    ::memcpy(&fpu, src, sizeof(fpu));
    src += sizeof(gpr);

    ::memcpy(&exc, src, sizeof(exc));
    uint32_t success_count = 0;
    if (WriteGPR() == KERN_SUCCESS)
      ++success_count;
    if (WriteFPU() == KERN_SUCCESS)
      ++success_count;
    if (WriteEXC() == KERN_SUCCESS)
      ++success_count;
    return success_count == 3;
  }
  return false;
}

uint32_t RegisterContextDarwin_arm::ConvertRegisterKindToRegisterNumber(
    lldb::RegisterKind kind, uint32_t reg) {
  if (kind == eRegisterKindGeneric) {
    switch (reg) {
    case LLDB_REGNUM_GENERIC_PC:
      return gpr_pc;
    case LLDB_REGNUM_GENERIC_SP:
      return gpr_sp;
    case LLDB_REGNUM_GENERIC_FP:
      return gpr_r7;
    case LLDB_REGNUM_GENERIC_RA:
      return gpr_lr;
    case LLDB_REGNUM_GENERIC_FLAGS:
      return gpr_cpsr;
    default:
      break;
    }
  } else if (kind == eRegisterKindDWARF) {
    switch (reg) {
    case dwarf_r0:
      return gpr_r0;
    case dwarf_r1:
      return gpr_r1;
    case dwarf_r2:
      return gpr_r2;
    case dwarf_r3:
      return gpr_r3;
    case dwarf_r4:
      return gpr_r4;
    case dwarf_r5:
      return gpr_r5;
    case dwarf_r6:
      return gpr_r6;
    case dwarf_r7:
      return gpr_r7;
    case dwarf_r8:
      return gpr_r8;
    case dwarf_r9:
      return gpr_r9;
    case dwarf_r10:
      return gpr_r10;
    case dwarf_r11:
      return gpr_r11;
    case dwarf_r12:
      return gpr_r12;
    case dwarf_sp:
      return gpr_sp;
    case dwarf_lr:
      return gpr_lr;
    case dwarf_pc:
      return gpr_pc;
    case dwarf_spsr:
      return gpr_cpsr;

    case dwarf_s0:
      return fpu_s0;
    case dwarf_s1:
      return fpu_s1;
    case dwarf_s2:
      return fpu_s2;
    case dwarf_s3:
      return fpu_s3;
    case dwarf_s4:
      return fpu_s4;
    case dwarf_s5:
      return fpu_s5;
    case dwarf_s6:
      return fpu_s6;
    case dwarf_s7:
      return fpu_s7;
    case dwarf_s8:
      return fpu_s8;
    case dwarf_s9:
      return fpu_s9;
    case dwarf_s10:
      return fpu_s10;
    case dwarf_s11:
      return fpu_s11;
    case dwarf_s12:
      return fpu_s12;
    case dwarf_s13:
      return fpu_s13;
    case dwarf_s14:
      return fpu_s14;
    case dwarf_s15:
      return fpu_s15;
    case dwarf_s16:
      return fpu_s16;
    case dwarf_s17:
      return fpu_s17;
    case dwarf_s18:
      return fpu_s18;
    case dwarf_s19:
      return fpu_s19;
    case dwarf_s20:
      return fpu_s20;
    case dwarf_s21:
      return fpu_s21;
    case dwarf_s22:
      return fpu_s22;
    case dwarf_s23:
      return fpu_s23;
    case dwarf_s24:
      return fpu_s24;
    case dwarf_s25:
      return fpu_s25;
    case dwarf_s26:
      return fpu_s26;
    case dwarf_s27:
      return fpu_s27;
    case dwarf_s28:
      return fpu_s28;
    case dwarf_s29:
      return fpu_s29;
    case dwarf_s30:
      return fpu_s30;
    case dwarf_s31:
      return fpu_s31;

    default:
      break;
    }
  } else if (kind == eRegisterKindEHFrame) {
    switch (reg) {
    case ehframe_r0:
      return gpr_r0;
    case ehframe_r1:
      return gpr_r1;
    case ehframe_r2:
      return gpr_r2;
    case ehframe_r3:
      return gpr_r3;
    case ehframe_r4:
      return gpr_r4;
    case ehframe_r5:
      return gpr_r5;
    case ehframe_r6:
      return gpr_r6;
    case ehframe_r7:
      return gpr_r7;
    case ehframe_r8:
      return gpr_r8;
    case ehframe_r9:
      return gpr_r9;
    case ehframe_r10:
      return gpr_r10;
    case ehframe_r11:
      return gpr_r11;
    case ehframe_r12:
      return gpr_r12;
    case ehframe_sp:
      return gpr_sp;
    case ehframe_lr:
      return gpr_lr;
    case ehframe_pc:
      return gpr_pc;
    case ehframe_cpsr:
      return gpr_cpsr;
    }
  } else if (kind == eRegisterKindLLDB) {
    return reg;
  }
  return LLDB_INVALID_REGNUM;
}

uint32_t RegisterContextDarwin_arm::NumSupportedHardwareBreakpoints() {
#if defined(__APPLE__) && defined(__arm__)
  // Set the init value to something that will let us know that we need to
  // autodetect how many breakpoints are supported dynamically...
  static uint32_t g_num_supported_hw_breakpoints = UINT32_MAX;
  if (g_num_supported_hw_breakpoints == UINT32_MAX) {
    // Set this to zero in case we can't tell if there are any HW breakpoints
    g_num_supported_hw_breakpoints = 0;

    uint32_t register_DBGDIDR;

    asm("mrc p14, 0, %0, c0, c0, 0" : "=r"(register_DBGDIDR));
    g_num_supported_hw_breakpoints = Bits32(register_DBGDIDR, 27, 24);
    // Zero is reserved for the BRP count, so don't increment it if it is zero
    if (g_num_supported_hw_breakpoints > 0)
      g_num_supported_hw_breakpoints++;
  }
  return g_num_supported_hw_breakpoints;
#else
  // TODO: figure out remote case here!
  return 6;
#endif
}

uint32_t RegisterContextDarwin_arm::SetHardwareBreakpoint(lldb::addr_t addr,
                                                          size_t size) {
  // Make sure our address isn't bogus
  if (addr & 1)
    return LLDB_INVALID_INDEX32;

  int kret = ReadDBG(false);

  if (kret == KERN_SUCCESS) {
    const uint32_t num_hw_breakpoints = NumSupportedHardwareBreakpoints();
    uint32_t i;
    for (i = 0; i < num_hw_breakpoints; ++i) {
      if ((dbg.bcr[i] & BCR_ENABLE) == 0)
        break; // We found an available hw breakpoint slot (in i)
    }

    // See if we found an available hw breakpoint slot above
    if (i < num_hw_breakpoints) {
      // Make sure bits 1:0 are clear in our address
      dbg.bvr[i] = addr & ~((lldb::addr_t)3);

      if (size == 2 || addr & 2) {
        uint32_t byte_addr_select = (addr & 2) ? BAS_IMVA_2_3 : BAS_IMVA_0_1;

        // We have a thumb breakpoint
        // We have an ARM breakpoint
        dbg.bcr[i] = BCR_M_IMVA_MATCH | // Stop on address mismatch
                     byte_addr_select | // Set the correct byte address select
                                        // so we only trigger on the correct
                                        // opcode
                     S_USER |    // Which modes should this breakpoint stop in?
                     BCR_ENABLE; // Enable this hardware breakpoint
                                 //                if (log) log->Printf
        //                ("RegisterContextDarwin_arm::EnableHardwareBreakpoint(
        //                addr = %8.8p, size = %u ) - BVR%u/BCR%u = 0x%8.8x /
        //                0x%8.8x (Thumb)",
        //                        addr,
        //                        size,
        //                        i,
        //                        i,
        //                        dbg.bvr[i],
        //                        dbg.bcr[i]);
      } else if (size == 4) {
        // We have an ARM breakpoint
        dbg.bcr[i] =
            BCR_M_IMVA_MATCH | // Stop on address mismatch
            BAS_IMVA_ALL | // Stop on any of the four bytes following the IMVA
            S_USER |       // Which modes should this breakpoint stop in?
            BCR_ENABLE;    // Enable this hardware breakpoint
                           //                if (log) log->Printf
        //                ("RegisterContextDarwin_arm::EnableHardwareBreakpoint(
        //                addr = %8.8p, size = %u ) - BVR%u/BCR%u = 0x%8.8x /
        //                0x%8.8x (ARM)",
        //                        addr,
        //                        size,
        //                        i,
        //                        i,
        //                        dbg.bvr[i],
        //                        dbg.bcr[i]);
      }

      kret = WriteDBG();
      //            if (log) log->Printf
      //            ("RegisterContextDarwin_arm::EnableHardwareBreakpoint()
      //            WriteDBG() => 0x%8.8x.", kret);

      if (kret == KERN_SUCCESS)
        return i;
    }
    //        else
    //        {
    //            if (log) log->Printf
    //            ("RegisterContextDarwin_arm::EnableHardwareBreakpoint(addr =
    //            %8.8p, size = %u) => all hardware breakpoint resources are
    //            being used.", addr, size);
    //        }
  }

  return LLDB_INVALID_INDEX32;
}

bool RegisterContextDarwin_arm::ClearHardwareBreakpoint(uint32_t hw_index) {
  int kret = ReadDBG(false);

  const uint32_t num_hw_points = NumSupportedHardwareBreakpoints();
  if (kret == KERN_SUCCESS) {
    if (hw_index < num_hw_points) {
      dbg.bcr[hw_index] = 0;
      //            if (log) log->Printf
      //            ("RegisterContextDarwin_arm::SetHardwareBreakpoint( %u ) -
      //            BVR%u = 0x%8.8x  BCR%u = 0x%8.8x",
      //                    hw_index,
      //                    hw_index,
      //                    dbg.bvr[hw_index],
      //                    hw_index,
      //                    dbg.bcr[hw_index]);

      kret = WriteDBG();

      if (kret == KERN_SUCCESS)
        return true;
    }
  }
  return false;
}

uint32_t RegisterContextDarwin_arm::NumSupportedHardwareWatchpoints() {
#if defined(__APPLE__) && defined(__arm__)
  // Set the init value to something that will let us know that we need to
  // autodetect how many watchpoints are supported dynamically...
  static uint32_t g_num_supported_hw_watchpoints = UINT32_MAX;
  if (g_num_supported_hw_watchpoints == UINT32_MAX) {
    // Set this to zero in case we can't tell if there are any HW breakpoints
    g_num_supported_hw_watchpoints = 0;

    uint32_t register_DBGDIDR;
    asm("mrc p14, 0, %0, c0, c0, 0" : "=r"(register_DBGDIDR));
    g_num_supported_hw_watchpoints = Bits32(register_DBGDIDR, 31, 28) + 1;
  }
  return g_num_supported_hw_watchpoints;
#else
  // TODO: figure out remote case here!
  return 2;
#endif
}

uint32_t RegisterContextDarwin_arm::SetHardwareWatchpoint(lldb::addr_t addr,
                                                          size_t size,
                                                          bool read,
                                                          bool write) {
  const uint32_t num_hw_watchpoints = NumSupportedHardwareWatchpoints();

  // Can't watch zero bytes
  if (size == 0)
    return LLDB_INVALID_INDEX32;

  // We must watch for either read or write
  if (!read && !write)
    return LLDB_INVALID_INDEX32;

  // Can't watch more than 4 bytes per WVR/WCR pair
  if (size > 4)
    return LLDB_INVALID_INDEX32;

  // We can only watch up to four bytes that follow a 4 byte aligned address
  // per watchpoint register pair. Since we have at most so we can only watch
  // until the next 4 byte boundary and we need to make sure we can properly
  // encode this.
  uint32_t addr_word_offset = addr % 4;
  //    if (log) log->Printf
  //    ("RegisterContextDarwin_arm::EnableHardwareWatchpoint() -
  //    addr_word_offset = 0x%8.8x", addr_word_offset);

  uint32_t byte_mask = ((1u << size) - 1u) << addr_word_offset;
  //    if (log) log->Printf
  //    ("RegisterContextDarwin_arm::EnableHardwareWatchpoint() - byte_mask =
  //    0x%8.8x", byte_mask);
  if (byte_mask > 0xfu)
    return LLDB_INVALID_INDEX32;

  // Read the debug state
  int kret = ReadDBG(false);

  if (kret == KERN_SUCCESS) {
    // Check to make sure we have the needed hardware support
    uint32_t i = 0;

    for (i = 0; i < num_hw_watchpoints; ++i) {
      if ((dbg.wcr[i] & WCR_ENABLE) == 0)
        break; // We found an available hw breakpoint slot (in i)
    }

    // See if we found an available hw breakpoint slot above
    if (i < num_hw_watchpoints) {
      // Make the byte_mask into a valid Byte Address Select mask
      uint32_t byte_address_select = byte_mask << 5;
      // Make sure bits 1:0 are clear in our address
      dbg.wvr[i] = addr & ~((lldb::addr_t)3);
      dbg.wcr[i] = byte_address_select |     // Which bytes that follow the IMVA
                                             // that we will watch
                   S_USER |                  // Stop only in user mode
                   (read ? WCR_LOAD : 0) |   // Stop on read access?
                   (write ? WCR_STORE : 0) | // Stop on write access?
                   WCR_ENABLE;               // Enable this watchpoint;

      kret = WriteDBG();
      //            if (log) log->Printf
      //            ("RegisterContextDarwin_arm::EnableHardwareWatchpoint()
      //            WriteDBG() => 0x%8.8x.", kret);

      if (kret == KERN_SUCCESS)
        return i;
    } else {
      //            if (log) log->Printf
      //            ("RegisterContextDarwin_arm::EnableHardwareWatchpoint(): All
      //            hardware resources (%u) are in use.", num_hw_watchpoints);
    }
  }
  return LLDB_INVALID_INDEX32;
}

bool RegisterContextDarwin_arm::ClearHardwareWatchpoint(uint32_t hw_index) {
  int kret = ReadDBG(false);

  const uint32_t num_hw_points = NumSupportedHardwareWatchpoints();
  if (kret == KERN_SUCCESS) {
    if (hw_index < num_hw_points) {
      dbg.wcr[hw_index] = 0;
      //            if (log) log->Printf
      //            ("RegisterContextDarwin_arm::ClearHardwareWatchpoint( %u ) -
      //            WVR%u = 0x%8.8x  WCR%u = 0x%8.8x",
      //                    hw_index,
      //                    hw_index,
      //                    dbg.wvr[hw_index],
      //                    hw_index,
      //                    dbg.wcr[hw_index]);

      kret = WriteDBG();

      if (kret == KERN_SUCCESS)
        return true;
    }
  }
  return false;
}