xref: /openbsd-src/gnu/llvm/lldb/source/Plugins/ABI/ARM/ABISysV_arm.cpp (revision f6aab3d83b51b91c24247ad2c2573574de475a82)

//===-- ABISysV_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 "ABISysV_arm.h"

#include <optional>
#include <vector>

#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Triple.h"

#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/Utility/RegisterValue.h"
#include "lldb/Utility/Scalar.h"
#include "lldb/Utility/Status.h"

#include "Plugins/Process/Utility/ARMDefines.h"
#include "Utility/ARM_DWARF_Registers.h"
#include "Utility/ARM_ehframe_Registers.h"

using namespace lldb;
using namespace lldb_private;

LLDB_PLUGIN_DEFINE(ABISysV_arm)

static const RegisterInfo g_register_infos[] = {
    //  NAME       ALT       SZ OFF ENCODING         FORMAT          EH_FRAME
    //  DWARF               GENERIC                     PROCESS PLUGIN
    //  LLDB NATIVE            VALUE REGS    INVALIDATE REGS
    //  ========== =======   == === =============    ============
    //  ======================= =================== ===========================
    //  ======================= ====================== ==========
    //  ===============
    {"r0",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r0, dwarf_r0, LLDB_REGNUM_GENERIC_ARG1, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r1",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r1, dwarf_r1, LLDB_REGNUM_GENERIC_ARG2, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r2",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r2, dwarf_r2, LLDB_REGNUM_GENERIC_ARG3, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r3",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r3, dwarf_r3, LLDB_REGNUM_GENERIC_ARG4, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r4",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r4, dwarf_r4, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r5",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r5, dwarf_r5, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r6",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r6, dwarf_r6, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r7",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r7, dwarf_r7, LLDB_REGNUM_GENERIC_FP, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r8",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r8, dwarf_r8, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r9",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r9, dwarf_r9, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r10",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r10, dwarf_r10, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r11",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r11, dwarf_r11, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r12",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_r12, dwarf_r12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"sp",
     "r13",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_sp, dwarf_sp, LLDB_REGNUM_GENERIC_SP, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"lr",
     "r14",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_lr, dwarf_lr, LLDB_REGNUM_GENERIC_RA, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"pc",
     "r15",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"cpsr",
     "psr",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {ehframe_cpsr, dwarf_cpsr, LLDB_REGNUM_GENERIC_FLAGS, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s0",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s0, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s1",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s2",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s3",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s4",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s4, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s5",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s5, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s6",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s6, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s7",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s7, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s8",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s8, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s9",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s9, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s10",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s10, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s11",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s11, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s12",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s13",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s13, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s14",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s14, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s15",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s15, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s16",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s16, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s17",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s17, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s18",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s18, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s19",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s19, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s20",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s20, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s21",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s21, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s22",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s22, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s23",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s23, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s24",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s24, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s25",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s25, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s26",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s26, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s27",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s27, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s28",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s28, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s29",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s29, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s30",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s30, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"s31",
     nullptr,
     4,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_s31, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"fpscr",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d0",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d0, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d1",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d1, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d2",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d2, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d3",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d3, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d4",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d4, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d5",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d5, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d6",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d6, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d7",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d7, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d8",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d8, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d9",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d9, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d10",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d10, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d11",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d11, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d12",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d12, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d13",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d13, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d14",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d14, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d15",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d15, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d16",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d16, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d17",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d17, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d18",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d18, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d19",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d19, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d20",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d20, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d21",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d21, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d22",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d22, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d23",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d23, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d24",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d24, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d25",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d25, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d26",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d26, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d27",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d27, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d28",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d28, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d29",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d29, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d30",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d30, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"d31",
     nullptr,
     8,
     0,
     eEncodingIEEE754,
     eFormatFloat,
     {LLDB_INVALID_REGNUM, dwarf_d31, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r8_usr",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r8_usr, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r9_usr",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r9_usr, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r10_usr",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r10_usr, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r11_usr",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r11_usr, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r12_usr",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r12_usr, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r13_usr",
     "sp_usr",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r13_usr, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r14_usr",
     "lr_usr",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r14_usr, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r8_fiq",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r8_fiq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r9_fiq",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r9_fiq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r10_fiq",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r10_fiq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r11_fiq",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r11_fiq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r12_fiq",
     nullptr,
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r12_fiq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r13_fiq",
     "sp_fiq",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r13_fiq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r14_fiq",
     "lr_fiq",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r14_fiq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r13_irq",
     "sp_irq",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r13_irq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r14_irq",
     "lr_irq",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r14_irq, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r13_abt",
     "sp_abt",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r13_abt, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r14_abt",
     "lr_abt",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r14_abt, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r13_und",
     "sp_und",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r13_und, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r14_und",
     "lr_und",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r14_und, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r13_svc",
     "sp_svc",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r13_svc, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
    },
    {"r14_svc",
     "lr_svc",
     4,
     0,
     eEncodingUint,
     eFormatHex,
     {LLDB_INVALID_REGNUM, dwarf_r14_svc, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
     nullptr,
     nullptr,
     }};

static const uint32_t k_num_register_infos = std::size(g_register_infos);

const lldb_private::RegisterInfo *
ABISysV_arm::GetRegisterInfoArray(uint32_t &count) {
  count = k_num_register_infos;
  return g_register_infos;
}

size_t ABISysV_arm::GetRedZoneSize() const { return 0; }

// Static Functions

ABISP
ABISysV_arm::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
  const llvm::Triple::ArchType arch_type = arch.GetTriple().getArch();
  const llvm::Triple::VendorType vendor_type = arch.GetTriple().getVendor();

  if (vendor_type != llvm::Triple::Apple) {
    if ((arch_type == llvm::Triple::arm) ||
        (arch_type == llvm::Triple::thumb)) {
      return ABISP(
          new ABISysV_arm(std::move(process_sp), MakeMCRegisterInfo(arch)));
    }
  }

  return ABISP();
}

bool ABISysV_arm::PrepareTrivialCall(Thread &thread, addr_t sp,
                                     addr_t function_addr, addr_t return_addr,
                                     llvm::ArrayRef<addr_t> args) const {
  RegisterContext *reg_ctx = thread.GetRegisterContext().get();
  if (!reg_ctx)
    return false;

  const uint32_t pc_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber(
      eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
  const uint32_t sp_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber(
      eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
  const uint32_t ra_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber(
      eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);

  RegisterValue reg_value;

  const uint8_t reg_names[] = {
      LLDB_REGNUM_GENERIC_ARG1, LLDB_REGNUM_GENERIC_ARG2,
      LLDB_REGNUM_GENERIC_ARG3, LLDB_REGNUM_GENERIC_ARG4};

  llvm::ArrayRef<addr_t>::iterator ai = args.begin(), ae = args.end();

  for (size_t i = 0; i < std::size(reg_names); ++i) {
    if (ai == ae)
      break;

    reg_value.SetUInt32(*ai);
    if (!reg_ctx->WriteRegister(
            reg_ctx->GetRegisterInfo(eRegisterKindGeneric, reg_names[i]),
            reg_value))
      return false;

    ++ai;
  }

  if (ai != ae) {
    // Spill onto the stack
    size_t num_stack_regs = ae - ai;

    sp -= (num_stack_regs * 4);
    // Keep the stack 8 byte aligned, not that we need to
    sp &= ~(8ull - 1ull);

    // just using arg1 to get the right size
    const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo(
        eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1);

    addr_t arg_pos = sp;

    for (; ai != ae; ++ai) {
      reg_value.SetUInt32(*ai);
      if (reg_ctx
              ->WriteRegisterValueToMemory(reg_info, arg_pos,
                                           reg_info->byte_size, reg_value)
              .Fail())
        return false;
      arg_pos += reg_info->byte_size;
    }
  }

  TargetSP target_sp(thread.CalculateTarget());
  Address so_addr;

  // Figure out if our return address is ARM or Thumb by using the
  // Address::GetCallableLoadAddress(Target*) which will figure out the ARM
  // thumb-ness and set the correct address bits for us.
  so_addr.SetLoadAddress(return_addr, target_sp.get());
  return_addr = so_addr.GetCallableLoadAddress(target_sp.get());

  // Set "lr" to the return address
  if (!reg_ctx->WriteRegisterFromUnsigned(ra_reg_num, return_addr))
    return false;

  // Set "sp" to the requested value
  if (!reg_ctx->WriteRegisterFromUnsigned(sp_reg_num, sp))
    return false;

  // If bit zero or 1 is set, this must be a thumb function, no need to figure
  // this out from the symbols.
  so_addr.SetLoadAddress(function_addr, target_sp.get());
  function_addr = so_addr.GetCallableLoadAddress(target_sp.get());

  const RegisterInfo *cpsr_reg_info =
      reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
  const uint32_t curr_cpsr = reg_ctx->ReadRegisterAsUnsigned(cpsr_reg_info, 0);

  // Make a new CPSR and mask out any Thumb IT (if/then) bits
  uint32_t new_cpsr = curr_cpsr & ~MASK_CPSR_IT_MASK;
  // If bit zero or 1 is set, this must be thumb...
  if (function_addr & 1ull)
    new_cpsr |= MASK_CPSR_T; // Set T bit in CPSR
  else
    new_cpsr &= ~MASK_CPSR_T; // Clear T bit in CPSR

  if (new_cpsr != curr_cpsr) {
    if (!reg_ctx->WriteRegisterFromUnsigned(cpsr_reg_info, new_cpsr))
      return false;
  }

  function_addr &=
      ~1ull; // clear bit zero since the CPSR will take care of the mode for us

  // Set "pc" to the address requested
  return reg_ctx->WriteRegisterFromUnsigned(pc_reg_num, function_addr);
}

bool ABISysV_arm::GetArgumentValues(Thread &thread, ValueList &values) const {
  uint32_t num_values = values.GetSize();

  ExecutionContext exe_ctx(thread.shared_from_this());
  // For now, assume that the types in the AST values come from the Target's
  // scratch AST.

  // Extract the register context so we can read arguments from registers

  RegisterContext *reg_ctx = thread.GetRegisterContext().get();

  if (!reg_ctx)
    return false;

  addr_t sp = 0;

  for (uint32_t value_idx = 0; value_idx < num_values; ++value_idx) {
    // We currently only support extracting values with Clang QualTypes. Do we
    // care about others?
    Value *value = values.GetValueAtIndex(value_idx);

    if (!value)
      return false;

    CompilerType compiler_type = value->GetCompilerType();
    if (compiler_type) {
      bool is_signed = false;
      size_t bit_width = 0;
      if (compiler_type.IsIntegerOrEnumerationType(is_signed) ||
          compiler_type.IsPointerOrReferenceType()) {
        if (std::optional<uint64_t> size = compiler_type.GetBitSize(&thread))
          bit_width = *size;
      } else {
        // We only handle integer, pointer and reference types currently...
        return false;
      }

      if (bit_width <= (exe_ctx.GetProcessRef().GetAddressByteSize() * 8)) {
        if (value_idx < 4) {
          // Arguments 1-4 are in r0-r3...
          const RegisterInfo *arg_reg_info = nullptr;
          arg_reg_info = reg_ctx->GetRegisterInfo(
              eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + value_idx);
          if (arg_reg_info) {
            RegisterValue reg_value;

            if (reg_ctx->ReadRegister(arg_reg_info, reg_value)) {
              if (is_signed)
                reg_value.SignExtend(bit_width);
              if (!reg_value.GetScalarValue(value->GetScalar()))
                return false;
              continue;
            }
          }
          return false;
        } else {
          if (sp == 0) {
            // Read the stack pointer if it already hasn't been read
            sp = reg_ctx->GetSP(0);
            if (sp == 0)
              return false;
          }

          // Arguments 5 on up are on the stack
          const uint32_t arg_byte_size = (bit_width + (8 - 1)) / 8;
          Status error;
          if (!exe_ctx.GetProcessRef().ReadScalarIntegerFromMemory(
                  sp, arg_byte_size, is_signed, value->GetScalar(), error))
            return false;

          sp += arg_byte_size;
        }
      }
    }
  }
  return true;
}

static bool GetReturnValuePassedInMemory(Thread &thread,
                                         RegisterContext *reg_ctx,
                                         size_t byte_size, Value &value) {
  Status error;
  DataBufferHeap buffer(byte_size, 0);

  const RegisterInfo *r0_reg_info =
      reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1);
  uint32_t address =
      reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX;
  thread.GetProcess()->ReadMemory(address, buffer.GetBytes(),
                                  buffer.GetByteSize(), error);

  if (error.Fail())
    return false;

  value.SetBytes(buffer.GetBytes(), buffer.GetByteSize());
  return true;
}

bool ABISysV_arm::IsArmHardFloat(Thread &thread) const {
  ProcessSP process_sp(thread.GetProcess());
  if (process_sp) {
    const ArchSpec &arch(process_sp->GetTarget().GetArchitecture());

    return (arch.GetFlags() & ArchSpec::eARM_abi_hard_float) != 0;
  }

  return false;
}

ValueObjectSP ABISysV_arm::GetReturnValueObjectImpl(
    Thread &thread, lldb_private::CompilerType &compiler_type) const {
  Value value;
  ValueObjectSP return_valobj_sp;

  if (!compiler_type)
    return return_valobj_sp;

  // value.SetContext (Value::eContextTypeClangType,
  // compiler_type.GetOpaqueQualType());
  value.SetCompilerType(compiler_type);

  RegisterContext *reg_ctx = thread.GetRegisterContext().get();
  if (!reg_ctx)
    return return_valobj_sp;

  bool is_signed;
  bool is_complex;
  uint32_t float_count;
  bool is_vfp_candidate = false;
  uint8_t vfp_count = 0;
  uint8_t vfp_byte_size = 0;

  // Get the pointer to the first stack argument so we have a place to start
  // when reading data

  const RegisterInfo *r0_reg_info =
      reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1);
  std::optional<uint64_t> bit_width = compiler_type.GetBitSize(&thread);
  std::optional<uint64_t> byte_size = compiler_type.GetByteSize(&thread);
  if (!bit_width || !byte_size)
    return return_valobj_sp;

  if (compiler_type.IsIntegerOrEnumerationType(is_signed)) {
    switch (*bit_width) {
    default:
      return return_valobj_sp;
    case 64: {
      const RegisterInfo *r1_reg_info = reg_ctx->GetRegisterInfo(
          eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2);
      uint64_t raw_value;
      raw_value = reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX;
      raw_value |= ((uint64_t)(reg_ctx->ReadRegisterAsUnsigned(r1_reg_info, 0) &
                               UINT32_MAX))
                   << 32;
      if (is_signed)
        value.GetScalar() = (int64_t)raw_value;
      else
        value.GetScalar() = (uint64_t)raw_value;
    } break;
    case 32:
      if (is_signed)
        value.GetScalar() = (int32_t)(
            reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX);
      else
        value.GetScalar() = (uint32_t)(
            reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX);
      break;
    case 16:
      if (is_signed)
        value.GetScalar() = (int16_t)(
            reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT16_MAX);
      else
        value.GetScalar() = (uint16_t)(
            reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT16_MAX);
      break;
    case 8:
      if (is_signed)
        value.GetScalar() = (int8_t)(
            reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT8_MAX);
      else
        value.GetScalar() = (uint8_t)(
            reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT8_MAX);
      break;
    }
  } else if (compiler_type.IsPointerType()) {
    uint32_t ptr =
        thread.GetRegisterContext()->ReadRegisterAsUnsigned(r0_reg_info, 0) &
        UINT32_MAX;
    value.GetScalar() = ptr;
  } else if (compiler_type.IsVectorType()) {
    if (IsArmHardFloat(thread) && (*byte_size == 8 || *byte_size == 16)) {
      is_vfp_candidate = true;
      vfp_byte_size = 8;
      vfp_count = (*byte_size == 8 ? 1 : 2);
    } else if (*byte_size <= 16) {
      DataBufferHeap buffer(16, 0);
      uint32_t *buffer_ptr = (uint32_t *)buffer.GetBytes();

      for (uint32_t i = 0; 4 * i < *byte_size; ++i) {
        const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo(
            eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + i);
        buffer_ptr[i] =
            reg_ctx->ReadRegisterAsUnsigned(reg_info, 0) & UINT32_MAX;
      }
      value.SetBytes(buffer.GetBytes(), *byte_size);
    } else {
      if (!GetReturnValuePassedInMemory(thread, reg_ctx, *byte_size, value))
        return return_valobj_sp;
    }
  } else if (compiler_type.IsFloatingPointType(float_count, is_complex)) {
    if (float_count == 1 && !is_complex) {
      switch (*bit_width) {
      default:
        return return_valobj_sp;
      case 64: {
        static_assert(sizeof(double) == sizeof(uint64_t));

        if (IsArmHardFloat(thread)) {
          RegisterValue reg_value;
          const RegisterInfo *d0_reg_info =
              reg_ctx->GetRegisterInfoByName("d0", 0);
          reg_ctx->ReadRegister(d0_reg_info, reg_value);
          value.GetScalar() = reg_value.GetAsDouble();
        } else {
          uint64_t raw_value;
          const RegisterInfo *r1_reg_info = reg_ctx->GetRegisterInfo(
              eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2);
          raw_value =
              reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX;
          raw_value |=
              ((uint64_t)(reg_ctx->ReadRegisterAsUnsigned(r1_reg_info, 0) &
                          UINT32_MAX))
              << 32;
          value.GetScalar() = *reinterpret_cast<double *>(&raw_value);
        }
        break;
      }
      case 16: // Half precision returned after a conversion to single precision
      case 32: {
        static_assert(sizeof(float) == sizeof(uint32_t));

        if (IsArmHardFloat(thread)) {
          RegisterValue reg_value;
          const RegisterInfo *s0_reg_info =
              reg_ctx->GetRegisterInfoByName("s0", 0);
          reg_ctx->ReadRegister(s0_reg_info, reg_value);
          value.GetScalar() = reg_value.GetAsFloat();
        } else {
          uint32_t raw_value;
          raw_value =
              reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX;
          value.GetScalar() = *reinterpret_cast<float *>(&raw_value);
        }
        break;
      }
      }
    } else if (is_complex && float_count == 2) {
      if (IsArmHardFloat(thread)) {
        is_vfp_candidate = true;
        vfp_byte_size = *byte_size / 2;
        vfp_count = 2;
      } else if (!GetReturnValuePassedInMemory(thread, reg_ctx, *bit_width / 8,
                                               value))
        return return_valobj_sp;
    } else
      // not handled yet
      return return_valobj_sp;
  } else if (compiler_type.IsAggregateType()) {
    if (IsArmHardFloat(thread)) {
      CompilerType base_type;
      const uint32_t homogeneous_count =
          compiler_type.IsHomogeneousAggregate(&base_type);

      if (homogeneous_count > 0 && homogeneous_count <= 4) {
        std::optional<uint64_t> base_byte_size = base_type.GetByteSize(&thread);
        if (base_type.IsVectorType()) {
          if (base_byte_size &&
              (*base_byte_size == 8 || *base_byte_size == 16)) {
            is_vfp_candidate = true;
            vfp_byte_size = 8;
            vfp_count = (*base_byte_size == 8 ? homogeneous_count
                                              : homogeneous_count * 2);
          }
        } else if (base_type.IsFloatingPointType(float_count, is_complex)) {
          if (float_count == 1 && !is_complex) {
            is_vfp_candidate = true;
            if (base_byte_size)
              vfp_byte_size = *base_byte_size;
            vfp_count = homogeneous_count;
          }
        }
      } else if (homogeneous_count == 0) {
        const uint32_t num_children = compiler_type.GetNumFields();

        if (num_children > 0 && num_children <= 2) {
          uint32_t index = 0;
          for (index = 0; index < num_children; index++) {
            std::string name;
            base_type = compiler_type.GetFieldAtIndex(index, name, nullptr,
                                                      nullptr, nullptr);

            if (base_type.IsFloatingPointType(float_count, is_complex)) {
              std::optional<uint64_t> base_byte_size =
                  base_type.GetByteSize(&thread);
              if (float_count == 2 && is_complex) {
                if (index != 0 && base_byte_size &&
                    vfp_byte_size != *base_byte_size)
                  break;
                else if (base_byte_size)
                  vfp_byte_size = *base_byte_size;
              } else
                break;
            } else
              break;
          }

          if (index == num_children) {
            is_vfp_candidate = true;
            vfp_byte_size = (vfp_byte_size >> 1);
            vfp_count = (num_children << 1);
          }
        }
      }
    }

    if (*byte_size <= 4) {
      RegisterValue r0_reg_value;
      uint32_t raw_value =
          reg_ctx->ReadRegisterAsUnsigned(r0_reg_info, 0) & UINT32_MAX;
      value.SetBytes(&raw_value, *byte_size);
    } else if (!is_vfp_candidate) {
      if (!GetReturnValuePassedInMemory(thread, reg_ctx, *byte_size, value))
        return return_valobj_sp;
    }
  } else {
    // not handled yet
    return return_valobj_sp;
  }

  if (is_vfp_candidate) {
    ProcessSP process_sp(thread.GetProcess());
    ByteOrder byte_order = process_sp->GetByteOrder();

    WritableDataBufferSP data_sp(new DataBufferHeap(*byte_size, 0));
    uint32_t data_offset = 0;

    for (uint32_t reg_index = 0; reg_index < vfp_count; reg_index++) {
      uint32_t regnum = 0;

      if (vfp_byte_size == 4)
        regnum = dwarf_s0 + reg_index;
      else if (vfp_byte_size == 8)
        regnum = dwarf_d0 + reg_index;
      else
        break;

      const RegisterInfo *reg_info =
          reg_ctx->GetRegisterInfo(eRegisterKindDWARF, regnum);
      if (reg_info == nullptr)
        break;

      RegisterValue reg_value;
      if (!reg_ctx->ReadRegister(reg_info, reg_value))
        break;

      // Make sure we have enough room in "data_sp"
      if ((data_offset + vfp_byte_size) <= data_sp->GetByteSize()) {
        Status error;
        const size_t bytes_copied = reg_value.GetAsMemoryData(
            *reg_info, data_sp->GetBytes() + data_offset, vfp_byte_size,
            byte_order, error);
        if (bytes_copied != vfp_byte_size)
          break;

        data_offset += bytes_copied;
      }
    }

    if (data_offset == *byte_size) {
      DataExtractor data;
      data.SetByteOrder(byte_order);
      data.SetAddressByteSize(process_sp->GetAddressByteSize());
      data.SetData(data_sp);

      return ValueObjectConstResult::Create(&thread, compiler_type,
                                            ConstString(""), data);
    } else { // Some error occurred while getting values from registers
      return return_valobj_sp;
    }
  }

  // If we get here, we have a valid Value, so make our ValueObject out of it:

  return_valobj_sp = ValueObjectConstResult::Create(
      thread.GetStackFrameAtIndex(0).get(), value, ConstString(""));
  return return_valobj_sp;
}

Status ABISysV_arm::SetReturnValueObject(lldb::StackFrameSP &frame_sp,
                                         lldb::ValueObjectSP &new_value_sp) {
  Status error;
  if (!new_value_sp) {
    error.SetErrorString("Empty value object for return value.");
    return error;
  }

  CompilerType compiler_type = new_value_sp->GetCompilerType();
  if (!compiler_type) {
    error.SetErrorString("Null clang type for return value.");
    return error;
  }

  Thread *thread = frame_sp->GetThread().get();

  bool is_signed;
  uint32_t count;
  bool is_complex;

  RegisterContext *reg_ctx = thread->GetRegisterContext().get();

  bool set_it_simple = false;
  if (compiler_type.IsIntegerOrEnumerationType(is_signed) ||
      compiler_type.IsPointerType()) {
    DataExtractor data;
    Status data_error;
    size_t num_bytes = new_value_sp->GetData(data, data_error);
    if (data_error.Fail()) {
      error.SetErrorStringWithFormat(
          "Couldn't convert return value to raw data: %s",
          data_error.AsCString());
      return error;
    }
    lldb::offset_t offset = 0;
    if (num_bytes <= 8) {
      const RegisterInfo *r0_info = reg_ctx->GetRegisterInfo(
          eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1);
      if (num_bytes <= 4) {
        uint32_t raw_value = data.GetMaxU32(&offset, num_bytes);

        if (reg_ctx->WriteRegisterFromUnsigned(r0_info, raw_value))
          set_it_simple = true;
      } else {
        uint32_t raw_value = data.GetMaxU32(&offset, 4);

        if (reg_ctx->WriteRegisterFromUnsigned(r0_info, raw_value)) {
          const RegisterInfo *r1_info = reg_ctx->GetRegisterInfo(
              eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2);
          uint32_t raw_value = data.GetMaxU32(&offset, num_bytes - offset);

          if (reg_ctx->WriteRegisterFromUnsigned(r1_info, raw_value))
            set_it_simple = true;
        }
      }
    } else {
      error.SetErrorString("We don't support returning longer than 64 bit "
                           "integer values at present.");
    }
  } else if (compiler_type.IsFloatingPointType(count, is_complex)) {
    if (is_complex)
      error.SetErrorString(
          "We don't support returning complex values at present");
    else
      error.SetErrorString(
          "We don't support returning float values at present");
  }

  if (!set_it_simple)
    error.SetErrorString(
        "We only support setting simple integer return types at present.");

  return error;
}

bool ABISysV_arm::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) {
  unwind_plan.Clear();
  unwind_plan.SetRegisterKind(eRegisterKindDWARF);

  uint32_t lr_reg_num = dwarf_lr;
  uint32_t sp_reg_num = dwarf_sp;
  uint32_t pc_reg_num = dwarf_pc;

  UnwindPlan::RowSP row(new UnwindPlan::Row);

  // Our Call Frame Address is the stack pointer value
  row->GetCFAValue().SetIsRegisterPlusOffset(sp_reg_num, 0);

  // The previous PC is in the LR
  row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true);
  unwind_plan.AppendRow(row);

  // All other registers are the same.

  unwind_plan.SetSourceName("arm at-func-entry default");
  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);

  return true;
}

bool ABISysV_arm::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) {
  unwind_plan.Clear();
  unwind_plan.SetRegisterKind(eRegisterKindDWARF);

  // TODO: Handle thumb
  uint32_t fp_reg_num = dwarf_r11;
  uint32_t pc_reg_num = dwarf_pc;

  UnwindPlan::RowSP row(new UnwindPlan::Row);
  const int32_t ptr_size = 4;

  row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size);
  row->SetOffset(0);
  row->SetUnspecifiedRegistersAreUndefined(true);

  row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true);
  row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true);

  unwind_plan.AppendRow(row);
  unwind_plan.SetSourceName("arm default unwind plan");
  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
  unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
  unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo);

  return true;
}

// cf. "ARMv6 Function Calling Conventions"

// ARMv7 on GNU/Linux general purpose reg rules:
//    r0-r3 not preserved  (used for argument passing)
//    r4-r11 preserved (v1-v8)
//    r12   not presrved
//    r13   preserved (stack pointer)
//    r14   preserved (link register)
//    r15   preserved (pc)
//    cpsr  not preserved (different rules for different bits)

// ARMv7 VFP register rules:
//    d0-d7   not preserved   (aka s0-s15, q0-q3)
//    d8-d15  preserved       (aka s16-s31, q4-q7)
//    d16-d31 not preserved   (aka q8-q15)

bool ABISysV_arm::RegisterIsVolatile(const RegisterInfo *reg_info) {
  if (reg_info) {
    // Volatile registers are: r0, r1, r2, r3, r9, r12, r13 (aka sp)
    const char *name = reg_info->name;
    if (name[0] == 'r') {
      switch (name[1]) {
      case '0':
        return name[2] == '\0'; // r0
      case '1':
        switch (name[2]) {
        case '\0':
          return true; // r1
        case '2':
          return name[3] == '\0'; // r12
        default:
          break;
        }
        break;

      case '2':
        return name[2] == '\0'; // r2
      case '3':
        return name[2] == '\0'; // r3
      default:
        break;
      }
    } else if (name[0] == 'd') {
      switch (name[1]) {
      case '0':
        return name[2] == '\0'; // d0 is volatile

      case '1':
        switch (name[2]) {
        case '\0':
          return true; // d1 is volatile
        case '6':
        case '7':
        case '8':
        case '9':
          return name[3] == '\0'; // d16 - d19 are volatile
        default:
          break;
        }
        break;

      case '2':
        switch (name[2]) {
        case '\0':
          return true; // d2 is volatile
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
          return name[3] == '\0'; // d20 - d29 are volatile
        default:
          break;
        }
        break;

      case '3':
        switch (name[2]) {
        case '\0':
          return true; // d3 is volatile
        case '0':
        case '1':
          return name[3] == '\0'; // d30 - d31 are volatile
        default:
          break;
        }
        break;
      case '4':
      case '5':
      case '6':
      case '7':
        return name[2] == '\0'; // d4 - d7 are volatile

      default:
        break;
      }
    } else if (name[0] == 's') {
      switch (name[1]) {
      case '0':
        return name[2] == '\0'; // s0 is volatile

      case '1':
        switch (name[2]) {
        case '\0':
          return true; // s1 is volatile
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
          return name[3] == '\0'; // s10 - s15 are volatile
        default:
          break;
        }
        break;

      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
        return name[2] == '\0'; // s2 - s9 are volatile

      default:
        break;
      }
    } else if (name[0] == 'q') {
      switch (name[1]) {
      case '1':
        switch (name[2]) {
        case '\0':
          return true; // q1 is volatile
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
          return true; // q10-q15 are volatile
        default:
          return false;
        }
        break;

      case '0':
      case '2':
      case '3':
        return name[2] == '\0'; // q0-q3 are volatile
      case '8':
      case '9':
        return name[2] == '\0'; // q8-q9 are volatile
      default:
        break;
      }
    } else if (name[0] == 's' && name[1] == 'p' && name[2] == '\0')
      return true;
  }
  return false;
}

void ABISysV_arm::Initialize() {
  PluginManager::RegisterPlugin(GetPluginNameStatic(),
                                "SysV ABI for arm targets", CreateInstance);
}

void ABISysV_arm::Terminate() {
  PluginManager::UnregisterPlugin(CreateInstance);
}