EIC code displayed by LXR master/​include/​llvm/​Support/​ARMWinEH.h	Source navigation Diff markup Identifier search General search
	Version: master test Revert   Change

File indexing completed on 2026-05-10 08:44:27

 //===-- llvm/Support/ARMWinEH.h - Windows on ARM EH Constants ---*- C++ -*-===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_SUPPORT_ARMWINEH_H
 #define LLVM_SUPPORT_ARMWINEH_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/Support/Endian.h"
 
 namespace llvm {
 namespace ARM {
 namespace WinEH {
 enum class RuntimeFunctionFlag {
   RFF_Unpacked,       /// unpacked entry
   RFF_Packed,         /// packed entry
   RFF_PackedFragment, /// packed entry representing a fragment
   RFF_Reserved,       /// reserved
 };
 
 enum class ReturnType {
   RT_POP,             /// return via pop {pc} (L flag must be set)
   RT_B,               /// 16-bit branch
   RT_BW,              /// 32-bit branch
   RT_NoEpilogue,      /// no epilogue (fragment)
 };
 
 /// RuntimeFunction - An entry in the table of procedure data (.pdata)
 ///
 /// This is ARM specific, but the Function Start RVA, Flag and
 /// ExceptionInformationRVA fields work identically for ARM64.
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +---------------------------------------------------------------+
 /// |                     Function Start RVA                        |
 /// +-------------------+-+-+-+-----+-+---+---------------------+---+
 /// |    Stack Adjust   |C|L|R| Reg |H|Ret|   Function Length   |Flg|
 /// +-------------------+-+-+-+-----+-+---+---------------------+---+
 ///
 /// Flag : 2-bit field with the following meanings:
 ///   - 00 = packed unwind data not used; reamining bits point to .xdata record
 ///   - 01 = packed unwind data
 ///   - 10 = packed unwind data, function assumed to have no prologue; useful
 ///          for function fragments that are discontiguous with the start of the
 ///          function
 ///   - 11 = reserved
 /// Function Length : 11-bit field providing the length of the entire function
 ///                   in bytes, divided by 2; if the function is greater than
 ///                   4KB, a full .xdata record must be used instead
 /// Ret : 2-bit field indicating how the function returns
 ///   - 00 = return via pop {pc} (the L bit must be set)
 ///   - 01 = return via 16-bit branch
 ///   - 10 = return via 32-bit branch
 ///   - 11 = no epilogue; useful for function fragments that may only contain a
 ///          prologue but the epilogue is elsewhere
 /// H : 1-bit flag indicating whether the function "homes" the integer parameter
 ///     registers (r0-r3), allocating 16-bytes on the stack
 /// Reg : 3-bit field indicating the index of the last saved non-volatile
 ///       register.  If the R bit is set to 0, then only integer registers are
 ///       saved (r4-rN, where N is 4 + Reg).  If the R bit is set to 1, then
 ///       only floating-point registers are being saved (d8-dN, where N is
 ///       8 + Reg).  The special case of the R bit being set to 1 and Reg equal
 ///       to 7 indicates that no registers are saved.
 /// R : 1-bit flag indicating whether the non-volatile registers are integer or
 ///     floating-point.  0 indicates integer, 1 indicates floating-point.  The
 ///     special case of the R-flag being set and Reg being set to 7 indicates
 ///     that no non-volatile registers are saved.
 /// L : 1-bit flag indicating whether the function saves/restores the link
 ///     register (LR)
 /// C : 1-bit flag indicating whether the function includes extra instructions
 ///     to setup a frame chain for fast walking.  If this flag is set, r11 is
 ///     implicitly added to the list of saved non-volatile integer registers.
 /// Stack Adjust : 10-bit field indicating the number of bytes of stack that are
 ///                allocated for this function.  Only values between 0x000 and
 ///                0x3f3 can be directly encoded.  If the value is 0x3f4 or
 ///                greater, then the low 4 bits have special meaning as follows:
 ///                - Bit 0-1
 ///                  indicate the number of words' of adjustment (1-4), minus 1
 ///                - Bit 2
 ///                  indicates if the prologue combined adjustment into push
 ///                - Bit 3
 ///                  indicates if the epilogue combined adjustment into pop
 ///
 /// RESTRICTIONS:
 ///   - IF C is SET:
 ///     + L flag must be set since frame chaining requires r11 and lr
 ///     + r11 must NOT be included in the set of registers described by Reg
 ///   - IF Ret is 0:
 ///     + L flag must be set
 
 // NOTE: RuntimeFunction is meant to be a simple class that provides raw access
 // to all fields in the structure.  The accessor methods reflect the names of
 // the bitfields that they correspond to.  Although some obvious simplifications
 // are possible via merging of methods, it would prevent the use of this class
 // to fully inspect the contents of the data structure which is particularly
 // useful for scenarios such as llvm-readobj to aid in testing.
 
 class RuntimeFunction {
 public:
   const support::ulittle32_t BeginAddress;
   const support::ulittle32_t UnwindData;
 
   RuntimeFunction(const support::ulittle32_t *Data)
     : BeginAddress(Data[0]), UnwindData(Data[1]) {}
 
   RuntimeFunction(const support::ulittle32_t BeginAddress,
                   const support::ulittle32_t UnwindData)
     : BeginAddress(BeginAddress), UnwindData(UnwindData) {}
 
   RuntimeFunctionFlag Flag() const {
     return RuntimeFunctionFlag(UnwindData & 0x3);
   }
 
   uint32_t ExceptionInformationRVA() const {
     assert(Flag() == RuntimeFunctionFlag::RFF_Unpacked &&
            "unpacked form required for this operation");
     return (UnwindData & ~0x3);
   }
 
   uint32_t PackedUnwindData() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return (UnwindData & ~0x3);
   }
   uint32_t FunctionLength() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return (((UnwindData & 0x00001ffc) >> 2) << 1);
   }
   ReturnType Ret() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     assert(((UnwindData & 0x00006000) || L()) && "L must be set to 1");
     return ReturnType((UnwindData & 0x00006000) >> 13);
   }
   bool H() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x00008000) >> 15);
   }
   uint8_t Reg() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x00070000) >> 16);
   }
   bool R() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x00080000) >> 19);
   }
   bool L() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x00100000) >> 20);
   }
   bool C() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     assert(((~UnwindData & 0x00200000) || L()) &&
            "L flag must be set, chaining requires r11 and LR");
     assert(((~UnwindData & 0x00200000) || (Reg() < 7) || R()) &&
            "r11 must not be included in Reg; C implies r11");
     return ((UnwindData & 0x00200000) >> 21);
   }
   uint16_t StackAdjust() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0xffc00000) >> 22);
   }
 };
 
 /// PrologueFolding - pseudo-flag derived from Stack Adjust indicating that the
 /// prologue has stack adjustment combined into the push
 inline bool PrologueFolding(const RuntimeFunction &RF) {
   return RF.StackAdjust() >= 0x3f4 && (RF.StackAdjust() & 0x4);
 }
 /// Epilogue - pseudo-flag derived from Stack Adjust indicating that the
 /// epilogue has stack adjustment combined into the pop
 inline bool EpilogueFolding(const RuntimeFunction &RF) {
   return RF.StackAdjust() >= 0x3f4 && (RF.StackAdjust() & 0x8);
 }
 /// StackAdjustment - calculated stack adjustment in words.  The stack
 /// adjustment should be determined via this function to account for the special
 /// handling the special encoding when the value is >= 0x3f4.
 inline uint16_t StackAdjustment(const RuntimeFunction &RF) {
   uint16_t Adjustment = RF.StackAdjust();
   if (Adjustment >= 0x3f4)
     return (Adjustment & 0x3) + 1;
   return Adjustment;
 }
 
 /// SavedRegisterMask - Utility function to calculate the set of saved general
 /// purpose (r0-r15) and VFP (d0-d31) registers.
 std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF,
                                                 bool Prologue = true);
 
 /// RuntimeFunctionARM64 - An entry in the table of procedure data (.pdata)
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +---------------------------------------------------------------+
 /// |                     Function Start RVA                        |
 /// +-----------------+---+-+-------+-----+---------------------+---+
 /// |    Frame Size   |CR |H| RegI  |RegF |   Function Length   |Flg|
 /// +-----------------+---+-+-------+-----+---------------------+---+
 ///
 /// See https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling
 /// for the full reference for this struct.
 
 class RuntimeFunctionARM64 {
 public:
   const support::ulittle32_t BeginAddress;
   const support::ulittle32_t UnwindData;
 
   RuntimeFunctionARM64(const support::ulittle32_t *Data)
       : BeginAddress(Data[0]), UnwindData(Data[1]) {}
 
   RuntimeFunctionARM64(const support::ulittle32_t BeginAddress,
                        const support::ulittle32_t UnwindData)
       : BeginAddress(BeginAddress), UnwindData(UnwindData) {}
 
   RuntimeFunctionFlag Flag() const {
     return RuntimeFunctionFlag(UnwindData & 0x3);
   }
 
   uint32_t ExceptionInformationRVA() const {
     assert(Flag() == RuntimeFunctionFlag::RFF_Unpacked &&
            "unpacked form required for this operation");
     return (UnwindData & ~0x3);
   }
 
   uint32_t PackedUnwindData() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return (UnwindData & ~0x3);
   }
   uint32_t FunctionLength() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return (((UnwindData & 0x00001ffc) >> 2) << 2);
   }
   uint8_t RegF() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x0000e000) >> 13);
   }
   uint8_t RegI() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x000f0000) >> 16);
   }
   bool H() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x00100000) >> 20);
   }
   uint8_t CR() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0x600000) >> 21);
   }
   uint16_t FrameSize() const {
     assert((Flag() == RuntimeFunctionFlag::RFF_Packed ||
             Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
            "packed form required for this operation");
     return ((UnwindData & 0xff800000) >> 23);
   }
 };
 
 /// ExceptionDataRecord - An entry in the table of exception data (.xdata)
 ///
 /// The format on ARM is:
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +-------+---------+-+-+-+---+-----------------------------------+
 /// | C Wrd | Epi Cnt |F|E|X|Ver|         Function Length           |
 /// +-------+--------+'-'-'-'---'---+-------------------------------+
 /// |    Reserved    |Ex. Code Words|   (Extended Epilogue Count)   |
 /// +-------+--------+--------------+-------------------------------+
 ///
 /// The format on ARM64 is:
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +---------+---------+-+-+---+-----------------------------------+
 /// |  C Wrd  | Epi Cnt |E|X|Ver|         Function Length           |
 /// +---------+------+--'-'-'---'---+-------------------------------+
 /// |    Reserved    |Ex. Code Words|   (Extended Epilogue Count)   |
 /// +-------+--------+--------------+-------------------------------+
 ///
 /// Function Length : 18-bit field indicating the total length of the function
 ///                   in bytes divided by 2.  If a function is larger than
 ///                   512KB, then multiple pdata and xdata records must be used.
 /// Vers : 2-bit field describing the version of the remaining structure.  Only
 ///        version 0 is currently defined (values 1-3 are not permitted).
 /// X : 1-bit field indicating the presence of exception data
 /// E : 1-bit field indicating that the single epilogue is packed into the
 ///     header
 /// F : 1-bit field indicating that the record describes a function fragment
 ///     (implies that no prologue is present, and prologue processing should be
 ///     skipped) (ARM only)
 /// Epilogue Count : 5-bit field that differs in meaning based on the E field.
 ///
 ///                  If E is set, then this field specifies the index of the
 ///                  first unwind code describing the (only) epilogue.
 ///
 ///                  Otherwise, this field indicates the number of exception
 ///                  scopes.  If more than 31 scopes exist, then this field and
 ///                  the Code Words field must both be set to 0 to indicate that
 ///                  an extension word is required.
 /// Code Words : 4-bit (5-bit on ARM64) field that specifies the number of
 ///              32-bit words needed to contain all the unwind codes.  If more
 ///              than 15 words (31 words on ARM64) are required, then this field
 ///              and the Epilogue Count field must both be set to 0 to indicate
 ///              that an extension word is required.
 /// Extended Epilogue Count, Extended Code Words :
 ///                          Valid only if Epilog Count and Code Words are both
 ///                          set to 0.  Provides an 8-bit extended code word
 ///                          count and 16-bits for epilogue count
 ///
 /// The epilogue scope format on ARM is:
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +----------------+------+---+---+-------------------------------+
 /// |  Ep Start Idx  | Cond |Res|       Epilogue Start Offset       |
 /// +----------------+------+---+-----------------------------------+
 ///
 /// The epilogue scope format on ARM64 is:
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +-------------------+-------+---+-------------------------------+
 /// |  Ep Start Idx     |  Res  |   Epilogue Start Offset           |
 /// +-------------------+-------+-----------------------------------+
 ///
 /// If the E bit is unset in the header, the header is followed by a series of
 /// epilogue scopes, which are sorted by their offset.
 ///
 /// Epilogue Start Offset: 18-bit field encoding the offset of epilogue relative
 ///                        to the start of the function in bytes divided by two
 /// Res : 2-bit field reserved for future expansion (must be set to 0)
 /// Condition : (ARM only) 4-bit field providing the condition under which the
 ///             epilogue is executed.  Unconditional epilogues should set this
 ///             field to 0xe. Epilogues must be entirely conditional or
 ///             unconditional, and in Thumb-2 mode.  The epilogue begins with
 ///             the first instruction after the IT opcode.
 /// Epilogue Start Index : 8-bit field indicating the byte index of the first
 ///                        unwind code describing the epilogue
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +---------------+---------------+---------------+---------------+
 /// | Unwind Code 3 | Unwind Code 2 | Unwind Code 1 | Unwind Code 0 |
 /// +---------------+---------------+---------------+---------------+
 ///
 /// Following the epilogue scopes, the byte code describing the unwinding
 /// follows.  This is padded to align up to word alignment.  Bytes are stored in
 /// little endian.
 ///
 ///  3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
 ///  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 /// +---------------------------------------------------------------+
 /// |           Exception Handler RVA (requires X = 1)              |
 /// +---------------------------------------------------------------+
 /// |  (possibly followed by data required for exception handler)   |
 /// +---------------------------------------------------------------+
 ///
 /// If the X bit is set in the header, the unwind byte code is followed by the
 /// exception handler information.  This constants of one Exception Handler RVA
 /// which is the address to the exception handler, followed immediately by the
 /// variable length data associated with the exception handler.
 ///
 
 struct EpilogueScope {
   const support::ulittle32_t ES;
 
   EpilogueScope(const support::ulittle32_t Data) : ES(Data) {}
   // Same for both ARM and AArch64.
   uint32_t EpilogueStartOffset() const {
     return (ES & 0x0003ffff);
   }
 
   // Different implementations for ARM and AArch64.
   uint8_t ResARM() const {
     return ((ES & 0x000c0000) >> 18);
   }
 
   uint8_t ResAArch64() const {
     return ((ES & 0x000f0000) >> 18);
   }
 
   // Condition is only applicable to ARM.
   uint8_t Condition() const {
     return ((ES & 0x00f00000) >> 20);
   }
 
   // Different implementations for ARM and AArch64.
   uint8_t EpilogueStartIndexARM() const {
     return ((ES & 0xff000000) >> 24);
   }
 
   uint16_t EpilogueStartIndexAArch64() const {
     return ((ES & 0xffc00000) >> 22);
   }
 };
 
 struct ExceptionDataRecord;
 inline size_t HeaderWords(const ExceptionDataRecord &XR);
 
 struct ExceptionDataRecord {
   const support::ulittle32_t *Data;
   bool isAArch64;
 
   ExceptionDataRecord(const support::ulittle32_t *Data, bool isAArch64) :
     Data(Data), isAArch64(isAArch64) {}
 
   uint32_t FunctionLength() const {
     return (Data[0] & 0x0003ffff);
   }
 
   uint32_t FunctionLengthInBytesARM() const {
     return FunctionLength() << 1;
   }
 
   uint32_t FunctionLengthInBytesAArch64() const {
     return FunctionLength() << 2;
   }
 
   uint8_t Vers() const {
     return (Data[0] & 0x000C0000) >> 18;
   }
 
   bool X() const {
     return ((Data[0] & 0x00100000) >> 20);
   }
 
   bool E() const {
     return ((Data[0] & 0x00200000) >> 21);
   }
 
   bool F() const {
     assert(!isAArch64 && "Fragments are only supported on ARMv7 WinEH");
     return ((Data[0] & 0x00400000) >> 22);
   }
 
   uint16_t EpilogueCount() const {
     if (HeaderWords(*this) == 1) {
       if (isAArch64)
         return (Data[0] & 0x07C00000) >> 22;
       return (Data[0] & 0x0f800000) >> 23;
     }
     return Data[1] & 0x0000ffff;
   }
 
   uint8_t CodeWords() const {
     if (HeaderWords(*this) == 1) {
       if (isAArch64)
         return (Data[0] & 0xf8000000) >> 27;
       return (Data[0] & 0xf0000000) >> 28;
     }
     return (Data[1] & 0x00ff0000) >> 16;
   }
 
   ArrayRef<support::ulittle32_t> EpilogueScopes() const {
     assert(E() == 0 && "epilogue scopes are only present when the E bit is 0");
     size_t Offset = HeaderWords(*this);
     return ArrayRef(&Data[Offset], EpilogueCount());
   }
 
   ArrayRef<uint8_t> UnwindByteCode() const {
     const size_t Offset = HeaderWords(*this)
                         + (E() ? 0 :  EpilogueCount());
     const uint8_t *ByteCode =
       reinterpret_cast<const uint8_t *>(&Data[Offset]);
     return ArrayRef(ByteCode, CodeWords() * sizeof(uint32_t));
   }
 
   uint32_t ExceptionHandlerRVA() const {
     assert(X() && "Exception Handler RVA is only valid if the X bit is set");
     return Data[HeaderWords(*this) + (E() ? 0 : EpilogueCount()) + CodeWords()];
   }
 
   uint32_t ExceptionHandlerParameter() const {
     assert(X() && "Exception Handler RVA is only valid if the X bit is set");
     return Data[HeaderWords(*this) + (E() ? 0 : EpilogueCount()) + CodeWords() +
                 1];
   }
 };
 
 inline size_t HeaderWords(const ExceptionDataRecord &XR) {
   if (XR.isAArch64)
     return (XR.Data[0] & 0xffc00000) ? 1 : 2;
   return (XR.Data[0] & 0xff800000) ? 1 : 2;
 }
 }
 }
 }
 
 #endif

This page was automatically generated by the 2.3.7 LXR engine. The LXR team