src/Registers.hpp

//===----------------------------- Registers.hpp --------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
//  Models register sets for supported processors.
//
//===----------------------------------------------------------------------===//

#ifndef __REGISTERS_HPP__
#define __REGISTERS_HPP__

#include <stdint.h>
#include <string.h>

#include "libunwind.h"
#include "config.h"

namespace libunwind {

// For emulating 128-bit registers
struct v128 { uint32_t vec[4]; };


#if defined(_LIBUNWIND_TARGET_I386)
/// Registers_x86 holds the register state of a thread in a 32-bit intel
/// process.
class _LIBUNWIND_HIDDEN Registers_x86 {
public:
  Registers_x86();
  Registers_x86(const void *registers);

  bool        validRegister(int num) const;
  uint32_t    getRegister(int num) const;
  void        setRegister(int num, uint32_t value);
  bool        validFloatRegister(int) const { return false; }
  double      getFloatRegister(int num) const;
  void        setFloatRegister(int num, double value);
  bool        validVectorRegister(int) const { return false; }
  v128        getVectorRegister(int num) const;
  void        setVectorRegister(int num, v128 value);
  const char *getRegisterName(int num);
  void        jumpto();
  static int  lastDwarfRegNum() { return 8; }

  uint32_t  getSP() const          { return _registers.__esp; }
  void      setSP(uint32_t value)  { _registers.__esp = value; }
  uint32_t  getIP() const          { return _registers.__eip; }
  void      setIP(uint32_t value)  { _registers.__eip = value; }
  uint32_t  getEBP() const         { return _registers.__ebp; }
  void      setEBP(uint32_t value) { _registers.__ebp = value; }
  uint32_t  getEBX() const         { return _registers.__ebx; }
  void      setEBX(uint32_t value) { _registers.__ebx = value; }
  uint32_t  getECX() const         { return _registers.__ecx; }
  void      setECX(uint32_t value) { _registers.__ecx = value; }
  uint32_t  getEDX() const         { return _registers.__edx; }
  void      setEDX(uint32_t value) { _registers.__edx = value; }
  uint32_t  getESI() const         { return _registers.__esi; }
  void      setESI(uint32_t value) { _registers.__esi = value; }
  uint32_t  getEDI() const         { return _registers.__edi; }
  void      setEDI(uint32_t value) { _registers.__edi = value; }

private:
  struct GPRs {
    unsigned int __eax;
    unsigned int __ebx;
    unsigned int __ecx;
    unsigned int __edx;
    unsigned int __edi;
    unsigned int __esi;
    unsigned int __ebp;
    unsigned int __esp;
    unsigned int __ss;
    unsigned int __eflags;
    unsigned int __eip;
    unsigned int __cs;
    unsigned int __ds;
    unsigned int __es;
    unsigned int __fs;
    unsigned int __gs;
  };

  GPRs _registers;
};

inline Registers_x86::Registers_x86(const void *registers) {
  static_assert((check_fit<Registers_x86, unw_context_t>::does_fit),
                "x86 registers do not fit into unw_context_t");
  memcpy(&_registers, registers, sizeof(_registers));
}

inline Registers_x86::Registers_x86() {
  memset(&_registers, 0, sizeof(_registers));
}

inline bool Registers_x86::validRegister(int regNum) const {
  if (regNum == UNW_REG_IP)
    return true;
  if (regNum == UNW_REG_SP)
    return true;
  if (regNum < 0)
    return false;
  if (regNum > 7)
    return false;
  return true;
}

inline uint32_t Registers_x86::getRegister(int regNum) const {
  switch (regNum) {
  case UNW_REG_IP:
    return _registers.__eip;
  case UNW_REG_SP:
    return _registers.__esp;
  case UNW_X86_EAX:
    return _registers.__eax;
  case UNW_X86_ECX:
    return _registers.__ecx;
  case UNW_X86_EDX:
    return _registers.__edx;
  case UNW_X86_EBX:
    return _registers.__ebx;
  case UNW_X86_EBP:
    return _registers.__ebp;
  case UNW_X86_ESP:
    return _registers.__esp;
  case UNW_X86_ESI:
    return _registers.__esi;
  case UNW_X86_EDI:
    return _registers.__edi;
  }
  _LIBUNWIND_ABORT("unsupported x86 register");
}

inline void Registers_x86::setRegister(int regNum, uint32_t value) {
  switch (regNum) {
  case UNW_REG_IP:
    _registers.__eip = value;
    return;
  case UNW_REG_SP:
    _registers.__esp = value;
    return;
  case UNW_X86_EAX:
    _registers.__eax = value;
    return;
  case UNW_X86_ECX:
    _registers.__ecx = value;
    return;
  case UNW_X86_EDX:
    _registers.__edx = value;
    return;
  case UNW_X86_EBX:
    _registers.__ebx = value;
    return;
  case UNW_X86_EBP:
    _registers.__ebp = value;
    return;
  case UNW_X86_ESP:
    _registers.__esp = value;
    return;
  case UNW_X86_ESI:
    _registers.__esi = value;
    return;
  case UNW_X86_EDI:
    _registers.__edi = value;
    return;
  }
  _LIBUNWIND_ABORT("unsupported x86 register");
}

inline const char *Registers_x86::getRegisterName(int regNum) {
  switch (regNum) {
  case UNW_REG_IP:
    return "ip";
  case UNW_REG_SP:
    return "esp";
  case UNW_X86_EAX:
    return "eax";
  case UNW_X86_ECX:
    return "ecx";
  case UNW_X86_EDX:
    return "edx";
  case UNW_X86_EBX:
    return "ebx";
  case UNW_X86_EBP:
    return "ebp";
  case UNW_X86_ESP:
    return "esp";
  case UNW_X86_ESI:
    return "esi";
  case UNW_X86_EDI:
    return "edi";
  default:
    return "unknown register";
  }
}

inline double Registers_x86::getFloatRegister(int) const {
  _LIBUNWIND_ABORT("no x86 float registers");
}

inline void Registers_x86::setFloatRegister(int, double) {
  _LIBUNWIND_ABORT("no x86 float registers");
}

inline v128 Registers_x86::getVectorRegister(int) const {
  _LIBUNWIND_ABORT("no x86 vector registers");
}

inline void Registers_x86::setVectorRegister(int, v128) {
  _LIBUNWIND_ABORT("no x86 vector registers");
}
#endif // _LIBUNWIND_TARGET_I386


#if defined(_LIBUNWIND_TARGET_X86_64)
/// Registers_x86_64  holds the register state of a thread in a 64-bit intel
/// process.
class _LIBUNWIND_HIDDEN Registers_x86_64 {
public:
  Registers_x86_64();
  Registers_x86_64(const void *registers);

  bool        validRegister(int num) const;
  uint64_t    getRegister(int num) const;
  void        setRegister(int num, uint64_t value);
  bool        validFloatRegister(int) const { return false; }
  double      getFloatRegister(int num) const;
  void        setFloatRegister(int num, double value);
  bool        validVectorRegister(int) const { return false; }
  v128        getVectorRegister(int num) const;
  void        setVectorRegister(int num, v128 value);
  const char *getRegisterName(int num);
  void        jumpto();
  static int  lastDwarfRegNum() { return 16; }

  uint64_t  getSP() const          { return _registers.__rsp; }
  void      setSP(uint64_t value)  { _registers.__rsp = value; }
  uint64_t  getIP() const          { return _registers.__rip; }
  void      setIP(uint64_t value)  { _registers.__rip = value; }
  uint64_t  getRBP() const         { return _registers.__rbp; }
  void      setRBP(uint64_t value) { _registers.__rbp = value; }
  uint64_t  getRBX() const         { return _registers.__rbx; }
  void      setRBX(uint64_t value) { _registers.__rbx = value; }
  uint64_t  getR12() const         { return _registers.__r12; }
  void      setR12(uint64_t value) { _registers.__r12 = value; }
  uint64_t  getR13() const         { return _registers.__r13; }
  void      setR13(uint64_t value) { _registers.__r13 = value; }
  uint64_t  getR14() const         { return _registers.__r14; }
  void      setR14(uint64_t value) { _registers.__r14 = value; }
  uint64_t  getR15() const         { return _registers.__r15; }
  void      setR15(uint64_t value) { _registers.__r15 = value; }

private:
  struct GPRs {
    uint64_t __rax;
    uint64_t __rbx;
    uint64_t __rcx;
    uint64_t __rdx;
    uint64_t __rdi;
    uint64_t __rsi;
    uint64_t __rbp;
    uint64_t __rsp;
    uint64_t __r8;
    uint64_t __r9;
    uint64_t __r10;
    uint64_t __r11;
    uint64_t __r12;
    uint64_t __r13;
    uint64_t __r14;
    uint64_t __r15;
    uint64_t __rip;
    uint64_t __rflags;
    uint64_t __cs;
    uint64_t __fs;
    uint64_t __gs;
  };
  GPRs _registers;
};

inline Registers_x86_64::Registers_x86_64(const void *registers) {
  static_assert((check_fit<Registers_x86_64, unw_context_t>::does_fit),
                "x86_64 registers do not fit into unw_context_t");
  memcpy(&_registers, registers, sizeof(_registers));
}

inline Registers_x86_64::Registers_x86_64() {
  memset(&_registers, 0, sizeof(_registers));
}

inline bool Registers_x86_64::validRegister(int regNum) const {
  if (regNum == UNW_REG_IP)
    return true;
  if (regNum == UNW_REG_SP)
    return true;
  if (regNum < 0)
    return false;
  if (regNum > 15)
    return false;
  return true;
}

inline uint64_t Registers_x86_64::getRegister(int regNum) const {
  switch (regNum) {
  case UNW_REG_IP:
    return _registers.__rip;
  case UNW_REG_SP:
    return _registers.__rsp;
  case UNW_X86_64_RAX:
    return _registers.__rax;
  case UNW_X86_64_RDX:
    return _registers.__rdx;
  case UNW_X86_64_RCX:
    return _registers.__rcx;
  case UNW_X86_64_RBX:
    return _registers.__rbx;
  case UNW_X86_64_RSI:
    return _registers.__rsi;
  case UNW_X86_64_RDI:
    return _registers.__rdi;
  case UNW_X86_64_RBP:
    return _registers.__rbp;
  case UNW_X86_64_RSP:
    return _registers.__rsp;
  case UNW_X86_64_R8:
    return _registers.__r8;
  case UNW_X86_64_R9:
    return _registers.__r9;
  case UNW_X86_64_R10:
    return _registers.__r10;
  case UNW_X86_64_R11:
    return _registers.__r11;
  case UNW_X86_64_R12:
    return _registers.__r12;
  case UNW_X86_64_R13:
    return _registers.__r13;
  case UNW_X86_64_R14:
    return _registers.__r14;
  case UNW_X86_64_R15:
    return _registers.__r15;
  }
  _LIBUNWIND_ABORT("unsupported x86_64 register");
}

inline void Registers_x86_64::setRegister(int regNum, uint64_t value) {
  switch (regNum) {
  case UNW_REG_IP:
    _registers.__rip = value;
    return;
  case UNW_REG_SP:
    _registers.__rsp = value;
    return;
  case UNW_X86_64_RAX:
    _registers.__rax = value;
    return;
  case UNW_X86_64_RDX:
    _registers.__rdx = value;
    return;
  case UNW_X86_64_RCX:
    _registers.__rcx = value;
    return;
  case UNW_X86_64_RBX:
    _registers.__rbx = value;
    return;
  case UNW_X86_64_RSI:
    _registers.__rsi = value;
    return;
  case UNW_X86_64_RDI:
    _registers.__rdi = value;
    return;
  case UNW_X86_64_RBP:
    _registers.__rbp = value;
    return;
  case UNW_X86_64_RSP:
    _registers.__rsp = value;
    return;
  case UNW_X86_64_R8:
    _registers.__r8 = value;
    return;
  case UNW_X86_64_R9:
    _registers.__r9 = value;
    return;
  case UNW_X86_64_R10:
    _registers.__r10 = value;
    return;
  case UNW_X86_64_R11:
    _registers.__r11 = value;
    return;
  case UNW_X86_64_R12:
    _registers.__r12 = value;
    return;
  case UNW_X86_64_R13:
    _registers.__r13 = value;
    return;
  case UNW_X86_64_R14:
    _registers.__r14 = value;
    return;
  case UNW_X86_64_R15:
    _registers.__r15 = value;
    return;
  }
  _LIBUNWIND_ABORT("unsupported x86_64 register");
}

inline const char *Registers_x86_64::getRegisterName(int regNum) {
  switch (regNum) {
  case UNW_REG_IP:
    return "rip";
  case UNW_REG_SP:
    return "rsp";
  case UNW_X86_64_RAX:
    return "rax";
  case UNW_X86_64_RDX:
    return "rdx";
  case UNW_X86_64_RCX:
    return "rcx";
  case UNW_X86_64_RBX:
    return "rbx";
  case UNW_X86_64_RSI:
    return "rsi";
  case UNW_X86_64_RDI:
    return "rdi";
  case UNW_X86_64_RBP:
    return "rbp";
  case UNW_X86_64_RSP:
    return "rsp";
  case UNW_X86_64_R8:
    return "r8";
  case UNW_X86_64_R9:
    return "r9";
  case UNW_X86_64_R10:
    return "r10";
  case UNW_X86_64_R11:
    return "r11";
  case UNW_X86_64_R12:
    return "r12";
  case UNW_X86_64_R13:
    return "r13";
  case UNW_X86_64_R14:
    return "r14";
  case UNW_X86_64_R15:
    return "r15";
  default:
    return "unknown register";
  }
}

inline double Registers_x86_64::getFloatRegister(int) const {
  _LIBUNWIND_ABORT("no x86_64 float registers");
}

inline void Registers_x86_64::setFloatRegister(int, double) {
  _LIBUNWIND_ABORT("no x86_64 float registers");
}

inline v128 Registers_x86_64::getVectorRegister(int) const {
  _LIBUNWIND_ABORT("no x86_64 vector registers");
}

inline void Registers_x86_64::setVectorRegister(int, v128) {
  _LIBUNWIND_ABORT("no x86_64 vector registers");
}
#endif // _LIBUNWIND_TARGET_X86_64


#if defined(_LIBUNWIND_TARGET_PPC)
/// Registers_ppc holds the register state of a thread in a 32-bit PowerPC
/// process.
class _LIBUNWIND_HIDDEN Registers_ppc {
public:
  Registers_ppc();
  Registers_ppc(const void *registers);

  bool        validRegister(int num) const;
  uint32_t    getRegister(int num) const;
  void        setRegister(int num, uint32_t value);
  bool        validFloatRegister(int num) const;
  double      getFloatRegister(int num) const;
  void        setFloatRegister(int num, double value);
  bool        validVectorRegister(int num) const;
  v128        getVectorRegister(int num) const;
  void        setVectorRegister(int num, v128 value);
  const char *getRegisterName(int num);
  void        jumpto();
  static int  lastDwarfRegNum() { return 112; }

  uint64_t  getSP() const         { return _registers.__r1; }
  void      setSP(uint32_t value) { _registers.__r1 = value; }
  uint64_t  getIP() const         { return _registers.__srr0; }
  void      setIP(uint32_t value) { _registers.__srr0 = value; }

private:
  struct ppc_thread_state_t {
    unsigned int __srr0; /* Instruction address register (PC) */
    unsigned int __srr1; /* Machine state register (supervisor) */
    unsigned int __r0;
    unsigned int __r1;
    unsigned int __r2;
    unsigned int __r3;
    unsigned int __r4;
    unsigned int __r5;
    unsigned int __r6;
    unsigned int __r7;
    unsigned int __r8;
    unsigned int __r9;
    unsigned int __r10;
    unsigned int __r11;
    unsigned int __r12;
    unsigned int __r13;
    unsigned int __r14;
    unsigned int __r15;
    unsigned int __r16;
    unsigned int __r17;
    unsigned int __r18;
    unsigned int __r19;
    unsigned int __r20;
    unsigned int __r21;
    unsigned int __r22;
    unsigned int __r23;
    unsigned int __r24;
    unsigned int __r25;
    unsigned int __r26;
    unsigned int __r27;
    unsigned int __r28;
    unsigned int __r29;
    unsigned int __r30;
    unsigned int __r31;
    unsigned int __cr;     /* Condition register */
    unsigned int __xer;    /* User's integer exception register */
    unsigned int __lr;     /* Link register */
    unsigned int __ctr;    /* Count register */
    unsigned int __mq;     /* MQ register (601 only) */
    unsigned int __vrsave; /* Vector Save Register */
  };

  struct ppc_float_state_t {
    double __fpregs[32];

    unsigned int __fpscr_pad; /* fpscr is 64 bits, 32 bits of rubbish */
    unsigned int __fpscr;     /* floating point status register */
  };

  ppc_thread_state_t _registers;
  ppc_float_state_t  _floatRegisters;
  v128               _vectorRegisters[32]; // offset 424
};

inline Registers_ppc::Registers_ppc(const void *registers) {
  static_assert((check_fit<Registers_ppc, unw_context_t>::does_fit),
                "ppc registers do not fit into unw_context_t");
  memcpy(&_registers, static_cast<const uint8_t *>(registers),
         sizeof(_registers));
  static_assert(sizeof(ppc_thread_state_t) == 160,
                "expected float register offset to be 160");
  memcpy(&_floatRegisters,
         static_cast<const uint8_t *>(registers) + sizeof(ppc_thread_state_t),
         sizeof(_floatRegisters));
  static_assert(sizeof(ppc_thread_state_t) + sizeof(ppc_float_state_t) == 424,
                "expected vector register offset to be 424 bytes");
  memcpy(_vectorRegisters,
         static_cast<const uint8_t *>(registers) + sizeof(ppc_thread_state_t) +
             sizeof(ppc_float_state_t),
         sizeof(_vectorRegisters));
}

inline Registers_ppc::Registers_ppc() {
  memset(&_registers, 0, sizeof(_registers));
  memset(&_floatRegisters, 0, sizeof(_floatRegisters));
  memset(&_vectorRegisters, 0, sizeof(_vectorRegisters));
}

inline bool Registers_ppc::validRegister(int regNum) const {
  if (regNum == UNW_REG_IP)
    return true;
  if (regNum == UNW_REG_SP)
    return true;
  if (regNum == UNW_PPC_VRSAVE)
    return true;
  if (regNum < 0)
    return false;
  if (regNum <= UNW_PPC_R31)
    return true;
  if (regNum == UNW_PPC_MQ)
    return true;
  if (regNum == UNW_PPC_LR)
    return true;
  if (regNum == UNW_PPC_CTR)
    return true;
  if ((UNW_PPC_CR0 <= regNum) && (regNum <= UNW_PPC_CR7))
    return true;
  return false;
}

inline uint32_t Registers_ppc::getRegister(int regNum) const {
  switch (regNum) {
  case UNW_REG_IP:
    return _registers.__srr0;
  case UNW_REG_SP:
    return _registers.__r1;
  case UNW_PPC_R0:
    return _registers.__r0;
  case UNW_PPC_R1:
    return _registers.__r1;
  case UNW_PPC_R2:
    return _registers.__r2;
  case UNW_PPC_R3:
    return _registers.__r3;
  case UNW_PPC_R4:
    return _registers.__r4;
  case UNW_PPC_R5:
    return _registers.__r5;
  case UNW_PPC_R6:
    return _registers.__r6;
  case UNW_PPC_R7:
    return _registers.__r7;
  case UNW_PPC_R8:
    return _registers.__r8;
  case UNW_PPC_R9:
    return _registers.__r9;
  case UNW_PPC_R10:
    return _registers.__r10;
  case UNW_PPC_R11:
    return _registers.__r11;
  case UNW_PPC_R12:
    return _registers.__r12;
  case UNW_PPC_R13:
    return _registers.__r13;
  case UNW_PPC_R14:
    return _registers.__r14;
  case UNW_PPC_R15:
    return _registers.__r15;
  case UNW_PPC_R16:
    return _registers.__r16;
  case UNW_PPC_R17:
    return _registers.__r17;
  case UNW_PPC_R18:
    return _registers.__r18;
  case UNW_PPC_R19:
    return _registers.__r19;
  case UNW_PPC_R20:
    return _registers.__r20;
  case UNW_PPC_R21:
    return _registers.__r21;
  case UNW_PPC_R22:
    return _registers.__r22;
  case UNW_PPC_R23:
    return _registers.__r23;
  case UNW_PPC_R24:
    return _registers.__r24;
  case UNW_PPC_R25:
    return _registers.__r25;
  case UNW_PPC_R26:
    return _registers.__r26;
  case UNW_PPC_R27:
    return _registers.__r27;
  case UNW_PPC_R28:
    return _registers.__r28;
  case UNW_PPC_R29:
    return _registers.__r29;
  case UNW_PPC_R30:
    return _registers.__r30;
  case UNW_PPC_R31:
    return _registers.__r31;
  case UNW_PPC_LR:
    return _registers.__lr;
  case UNW_PPC_CR0:
    return (_registers.__cr & 0xF0000000);
  case UNW_PPC_CR1:
    return (_registers.__cr & 0x0F000000);
  case UNW_PPC_CR2:
    return (_registers.__cr & 0x00F00000);
  case UNW_PPC_CR3:
    return (_registers.__cr & 0x000F0000);
  case UNW_PPC_CR4:
    return (_registers.__cr & 0x0000F000);
  case UNW_PPC_CR5:
    return (_registers.__cr & 0x00000F00);
  case UNW_PPC_CR6:
    return (_registers.__cr & 0x000000F0);
  case UNW_PPC_CR7:
    return (_registers.__cr & 0x0000000F);
  case UNW_PPC_VRSAVE:
    return _registers.__vrsave;
  }
  _LIBUNWIND_ABORT("unsupported ppc register");
}

inline void Registers_ppc::setRegister(int regNum, uint32_t value) {
  //fprintf(stderr, "Registers_ppc::setRegister(%d, 0x%08X)\n", regNum, value);
  switch (regNum) {
  case UNW_REG_IP:
    _registers.__srr0 = value;
    return;
  case UNW_REG_SP:
    _registers.__r1 = value;
    return;
  case UNW_PPC_R0:
    _registers.__r0 = value;
    return;
  case UNW_PPC_R1:
    _registers.__r1 = value;
    return;
  case UNW_PPC_R2:
    _registers.__r2 = value;
    return;
  case UNW_PPC_R3:
    _registers.__r3 = value;
    return;
  case UNW_PPC_R4:
    _registers.__r4 = value;
    return;
  case UNW_PPC_R5:
    _registers.__r5 = value;
    return;
  case UNW_PPC_R6:
    _registers.__r6 = value;
    return;
  case UNW_PPC_R7:
    _registers.__r7 = value;
    return;
  case UNW_PPC_R8:
    _registers.__r8 = value;
    return;
  case UNW_PPC_R9:
    _registers.__r9 = value;
    return;
  case UNW_PPC_R10:
    _registers.__r10 = value;
    return;
  case UNW_PPC_R11:
    _registers.__r11 = value;
    return;
  case UNW_PPC_R12:
    _registers.__r12 = value;
    return;
  case UNW_PPC_R13:
    _registers.__r13 = value;
    return;
  case UNW_PPC_R14:
    _registers.__r14 = value;
    return;
  case UNW_PPC_R15:
    _registers.__r15 = value;
    return;
  case UNW_PPC_R16:
    _registers.__r16 = value;
    return;
  case UNW_PPC_R17:
    _registers.__r17 = value;
    return;
  case UNW_PPC_R18:
    _registers.__r18 = value;
    return;
  case UNW_PPC_R19:
    _registers.__r19 = value;
    return;
  case UNW_PPC_R20:
    _registers.__r20 = value;
    return;
  case UNW_PPC_R21:
    _registers.__r21 = value;
    return;
  case UNW_PPC_R22:
    _registers.__r22 = value;
    return;
  case UNW_PPC_R23:
    _registers.__r23 = value;
    return;
  case UNW_PPC_R24:
    _registers.__r24 = value;
    return;
  case UNW_PPC_R25:
    _registers.__r25 = value;
    return;
  case UNW_PPC_R26:
    _registers.__r26 = value;
    return;
  case UNW_PPC_R27:
    _registers.__r27 = value;
    return;
  case UNW_PPC_R28:
    _registers.__r28 = value;
    return;
  case UNW_PPC_R29:
    _registers.__r29 = value;
    return;
  case UNW_PPC_R30:
    _registers.__r30 = value;
    return;
  case UNW_PPC_R31:
    _registers.__r31 = value;
    return;
  case UNW_PPC_MQ:
    _registers.__mq = value;
    return;
  case UNW_PPC_LR:
    _registers.__lr = value;
    return;
  case UNW_PPC_CTR:
    _registers.__ctr = value;
    return;
  case UNW_PPC_CR0:
    _registers.__cr &= 0x0FFFFFFF;
    _registers.__cr |= (value & 0xF0000000);
    return;
  case UNW_PPC_CR1:
    _registers.__cr &= 0xF0FFFFFF;
    _registers.__cr |= (value & 0x0F000000);
    return;
  case UNW_PPC_CR2:
    _registers.__cr &= 0xFF0FFFFF;
    _registers.__cr |= (value & 0x00F00000);
    return;
  case UNW_PPC_CR3:
    _registers.__cr &= 0xFFF0FFFF;
    _registers.__cr |= (value & 0x000F0000);
    return;
  case UNW_PPC_CR4:
    _registers.__cr &= 0xFFFF0FFF;
    _registers.__cr |= (value & 0x0000F000);
    return;
  case UNW_PPC_CR5:
    _registers.__cr &= 0xFFFFF0FF;
    _registers.__cr |= (value & 0x00000F00);
    return;
  case UNW_PPC_CR6:
    _registers.__cr &= 0xFFFFFF0F;
    _registers.__cr |= (value & 0x000000F0);
    return;
  case UNW_PPC_CR7:
    _registers.__cr &= 0xFFFFFFF0;
    _registers.__cr |= (value & 0x0000000F);
    return;
  case UNW_PPC_VRSAVE:
    _registers.__vrsave = value;
    return;
    // not saved
    return;
  case UNW_PPC_XER:
    _registers.__xer = value;
    return;
  case UNW_PPC_AP:
  case UNW_PPC_VSCR:
  case UNW_PPC_SPEFSCR:
    // not saved
    return;
  }
  _LIBUNWIND_ABORT("unsupported ppc register");
}

inline bool Registers_ppc::validFloatRegister(int regNum) const {
  if (regNum < UNW_PPC_F0)
    return false;
  if (regNum > UNW_PPC_F31)
    return false;
  return true;
}

inline double Registers_ppc::getFloatRegister(int regNum) const {
  assert(validFloatRegister(regNum));
  return _floatRegisters.__fpregs[regNum - UNW_PPC_F0];
}

inline void Registers_ppc::setFloatRegister(int regNum, double value) {
  assert(validFloatRegister(regNum));
  _floatRegisters.__fpregs[regNum - UNW_PPC_F0] = value;
}

inline bool Registers_ppc::validVectorRegister(int regNum) const {
  if (regNum < UNW_PPC_V0)
    return false;
  if (regNum > UNW_PPC_V31)
    return false;
  return true;
}

inline v128 Registers_ppc::getVectorRegister(int regNum) const {
  assert(validVectorRegister(regNum));
  v128 result = _vectorRegisters[regNum - UNW_PPC_V0];
  return result;
}

inline void Registers_ppc::setVectorRegister(int regNum, v128 value) {
  assert(validVectorRegister(regNum));
  _vectorRegisters[regNum - UNW_PPC_V0] = value;
}

inline const char *Registers_ppc::getRegisterName(int regNum) {
  switch (regNum) {
  case UNW_REG_IP:
    return "ip";
  case UNW_REG_SP:
    return "sp";
  case UNW_PPC_R0:
    return "r0";
  case UNW_PPC_R1:
    return "r1";
  case UNW_PPC_R2:
    return "r2";
  case UNW_PPC_R3:
    return "r3";
  case UNW_PPC_R4:
    return "r4";
  case UNW_PPC_R5:
    return "r5";
  case UNW_PPC_R6:
    return "r6";
  case UNW_PPC_R7:
    return "r7";
  case UNW_PPC_R8:
    return "r8";
  case UNW_PPC_R9:
    return "r9";
  case UNW_PPC_R10:
    return "r10";
  case UNW_PPC_R11:
    return "r11";
  case UNW_PPC_R12:
    return "r12";
  case UNW_PPC_R13:
    return "r13";
  case UNW_PPC_R14:
    return "r14";
  case UNW_PPC_R15:
    return "r15";
  case UNW_PPC_R16:
    return "r16";
  case UNW_PPC_R17:
    return "r17";
  case UNW_PPC_R18:
    return "r18";
  case UNW_PPC_R19:
    return "r19";
  case UNW_PPC_R20:
    return "r20";
  case UNW_PPC_R21:
    return "r21";
  case UNW_PPC_R22:
    return "r22";
  case UNW_PPC_R23:
    return "r23";
  case UNW_PPC_R24:
    return "r24";
  case UNW_PPC_R25:
    return "r25";
  case UNW_PPC_R26:
    return "r26";
  case UNW_PPC_R27:
    return "r27";
  case UNW_PPC_R28:
    return "r28";
  case UNW_PPC_R29:
    return "r29";
  case UNW_PPC_R30:
    return "r30";
  case UNW_PPC_R31:
    return "r31";
  case UNW_PPC_F0:
    return "fp0";
  case UNW_PPC_F1:
    return "fp1";
  case UNW_PPC_F2:
    return "fp2";
  case UNW_PPC_F3:
    return "fp3";
  case UNW_PPC_F4:
    return "fp4";
  case UNW_PPC_F5:
    return "fp5";
  case UNW_PPC_F6:
    return "fp6";
  case UNW_PPC_F7:
    return "fp7";
  case UNW_PPC_F8:
    return "fp8";
  case UNW_PPC_F9:
    return "fp9";
  case UNW_PPC_F10:
    return "fp10";
  case UNW_PPC_F11:
    return "fp11";
  case UNW_PPC_F12:
    return "fp12";
  case UNW_PPC_F13:
    return "fp13";
  case UNW_PPC_F14:
    return "fp14";
  case UNW_PPC_F15:
    return "fp15";
  case UNW_PPC_F16:
    return "fp16";
  case UNW_PPC_F17:
    return "fp17";
  case UNW_PPC_F18:
    return "fp18";
  case UNW_PPC_F19:
    return "fp19";
  case UNW_PPC_F20:
    return "fp20";
  case UNW_PPC_F21:
    return "fp21";
  case UNW_PPC_F22:
    return "fp22";
  case UNW_PPC_F23:
    return "fp23";
  case UNW_PPC_F24:
    return "fp24";
  case UNW_PPC_F25:
    return "fp25";
  case UNW_PPC_F26:
    return "fp26";
  case UNW_PPC_F27:
    return "fp27";
  case UNW_PPC_F28:
    return "fp28";
  case UNW_PPC_F29:
    return "fp29";
  case UNW_PPC_F30:
    return "fp30";
  case UNW_PPC_F31:
    return "fp31";
  case UNW_PPC_LR:
    return "lr";
  default:
    return "unknown register";
  }

}
#endif // _LIBUNWIND_TARGET_PPC


#if defined(_LIBUNWIND_TARGET_AARCH64)
/// Registers_arm64  holds the register state of a thread in a 64-bit arm
/// process.
class _LIBUNWIND_HIDDEN Registers_arm64 {
public:
  Registers_arm64();
  Registers_arm64(const void *registers);

  bool        validRegister(int num) const;
  uint64_t    getRegister(int num) const;
  void        setRegister(int num, uint64_t value);
  bool        validFloatRegister(int num) const;
  double      getFloatRegister(int num) const;
  void        setFloatRegister(int num, double value);
  bool        validVectorRegister(int num) const;
  v128        getVectorRegister(int num) const;
  void        setVectorRegister(int num, v128 value);
  const char *getRegisterName(int num);
  void        jumpto();
  static int  lastDwarfRegNum() { return 95; }

  uint64_t  getSP() const         { return _registers.__sp; }
  void      setSP(uint64_t value) { _registers.__sp = value; }
  uint64_t  getIP() const         { return _registers.__pc; }
  void      setIP(uint64_t value) { _registers.__pc = value; }
  uint64_t  getFP() const         { return _registers.__fp; }
  void      setFP(uint64_t value) { _registers.__fp = value; }

private:
  struct GPRs {
    uint64_t __x[29]; // x0-x28
    uint64_t __fp;    // Frame pointer x29
    uint64_t __lr;    // Link register x30
    uint64_t __sp;    // Stack pointer x31
    uint64_t __pc;    // Program counter
    uint64_t padding; // 16-byte align
  };

  GPRs    _registers;
  double  _vectorHalfRegisters[32];
  // Currently only the lower double in 128-bit vectore registers
  // is perserved during unwinding.  We could define new register
  // numbers (> 96) which mean whole vector registers, then this
  // struct would need to change to contain whole vector registers.
};

inline Registers_arm64::Registers_arm64(const void *registers) {
  static_assert((check_fit<Registers_arm64, unw_context_t>::does_fit),
                "arm64 registers do not fit into unw_context_t");
  memcpy(&_registers, registers, sizeof(_registers));
  static_assert(sizeof(GPRs) == 0x110,
                "expected VFP registers to be at offset 272");
  memcpy(_vectorHalfRegisters,
         static_cast<const uint8_t *>(registers) + sizeof(GPRs),
         sizeof(_vectorHalfRegisters));
}

inline Registers_arm64::Registers_arm64() {
  memset(&_registers, 0, sizeof(_registers));
  memset(&_vectorHalfRegisters, 0, sizeof(_vectorHalfRegisters));
}

inline bool Registers_arm64::validRegister(int regNum) const {
  if (regNum == UNW_REG_IP)
    return true;
  if (regNum == UNW_REG_SP)
    return true;
  if (regNum < 0)
    return false;
  if (regNum > 95)
    return false;
  if ((regNum > 31) && (regNum < 64))
    return false;
  return true;
}

inline uint64_t Registers_arm64::getRegister(int regNum) const {
  if (regNum == UNW_REG_IP)
    return _registers.__pc;
  if (regNum == UNW_REG_SP)
    return _registers.__sp;
  if ((regNum >= 0) && (regNum < 32))
    return _registers.__x[regNum];
  _LIBUNWIND_ABORT("unsupported arm64 register");
}

inline void Registers_arm64::setRegister(int regNum, uint64_t value) {
  if (regNum == UNW_REG_IP)
    _registers.__pc = value;
  else if (regNum == UNW_REG_SP)
    _registers.__sp = value;
  else if ((regNum >= 0) && (regNum < 32))
    _registers.__x[regNum] = value;
  else
    _LIBUNWIND_ABORT("unsupported arm64 register");
}

inline const char *Registers_arm64::getRegisterName(int regNum) {
  switch (regNum) {
  case UNW_REG_IP:
    return "pc";
  case UNW_REG_SP:
    return "sp";
  case UNW_ARM64_X0:
    return "x0";
  case UNW_ARM64_X1:
    return "x1";
  case UNW_ARM64_X2:
    return "x2";
  case UNW_ARM64_X3:
    return "x3";
  case UNW_ARM64_X4:
    return "x4";
  case UNW_ARM64_X5:
    return "x5";
  case UNW_ARM64_X6:
    return "x6";
  case UNW_ARM64_X7:
    return "x7";
  case UNW_ARM64_X8:
    return "x8";
  case UNW_ARM64_X9:
    return "x9";
  case UNW_ARM64_X10:
    return "x10";
  case UNW_ARM64_X11:
    return "x11";
  case UNW_ARM64_X12:
    return "x12";
  case UNW_ARM64_X13:
    return "x13";
  case UNW_ARM64_X14:
    return "x14";
  case UNW_ARM64_X15:
    return "x15";
  case UNW_ARM64_X16:
    return "x16";
  case UNW_ARM64_X17:
    return "x17";
  case UNW_ARM64_X18:
    return "x18";
  case UNW_ARM64_X19:
    return "x19";
  case UNW_ARM64_X20:
    return "x20";
  case UNW_ARM64_X21:
    return "x21";
  case UNW_ARM64_X22:
    return "x22";
  case UNW_ARM64_X23:
    return "x23";
  case UNW_ARM64_X24:
    return "x24";
  case UNW_ARM64_X25:
    return "x25";
  case UNW_ARM64_X26:
    return "x26";
  case UNW_ARM64_X27:
    return "x27";
  case UNW_ARM64_X28:
    return "x28";
  case UNW_ARM64_X29:
    return "fp";
  case UNW_ARM64_X30:
    return "lr";
  case UNW_ARM64_X31:
    return "sp";
  case UNW_ARM64_D0:
    return "d0";
  case UNW_ARM64_D1:
    return "d1";
  case UNW_ARM64_D2:
    return "d2";
  case UNW_ARM64_D3:
    return "d3";
  case UNW_ARM64_D4:
    return "d4";
  case UNW_ARM64_D5:
    return "d5";
  case UNW_ARM64_D6:
    return "d6";
  case UNW_ARM64_D7:
    return "d7";
  case UNW_ARM64_D8:
    return "d8";
  case UNW_ARM64_D9:
    return "d9";
  case UNW_ARM64_D10:
    return "d10";
  case UNW_ARM64_D11:
    return "d11";
  case UNW_ARM64_D12:
    return "d12";
  case UNW_ARM64_D13:
    return "d13";
  case UNW_ARM64_D14:
    return "d14";
  case UNW_ARM64_D15:
    return "d15";
  case UNW_ARM64_D16:
    return "d16";
  case UNW_ARM64_D17:
    return "d17";
  case UNW_ARM64_D18:
    return "d18";
  case UNW_ARM64_D19:
    return "d19";
  case UNW_ARM64_D20:
    return "d20";
  case UNW_ARM64_D21:
    return "d21";
  case UNW_ARM64_D22:
    return "d22";
  case UNW_ARM64_D23:
    return "d23";
  case UNW_ARM64_D24:
    return "d24";
  case UNW_ARM64_D25:
    return "d25";
  case UNW_ARM64_D26:
    return "d26";
  case UNW_ARM64_D27:
    return "d27";
  case UNW_ARM64_D28:
    return "d28";
  case UNW_ARM64_D29:
    return "d29";
  case UNW_ARM64_D30:
    return "d30";
  case UNW_ARM64_D31:
    return "d31";
  default:
    return "unknown register";
  }
}

inline bool Registers_arm64::validFloatRegister(int regNum) const {
  if (regNum < UNW_ARM64_D0)
    return false;
  if (regNum > UNW_ARM64_D31)
    return false;
  return true;
}

inline double Registers_arm64::getFloatRegister(int regNum) const {
  assert(validFloatRegister(regNum));
  return _vectorHalfRegisters[regNum - UNW_ARM64_D0];
}

inline void Registers_arm64::setFloatRegister(int regNum, double value) {
  assert(validFloatRegister(regNum));
  _vectorHalfRegisters[regNum - UNW_ARM64_D0] = value;
}

inline bool Registers_arm64::validVectorRegister(int) const {
  return false;
}

inline v128 Registers_arm64::getVectorRegister(int) const {
  _LIBUNWIND_ABORT("no arm64 vector register support yet");
}

inline void Registers_arm64::setVectorRegister(int, v128) {
  _LIBUNWIND_ABORT("no arm64 vector register support yet");
}
#endif // _LIBUNWIND_TARGET_AARCH64

#if defined(_LIBUNWIND_TARGET_ARM)
/// Registers_arm holds the register state of a thread in a 32-bit arm
/// process.
///
/// NOTE: Assumes VFPv3. On ARM processors without a floating point unit,
/// this uses more memory than required.
class _LIBUNWIND_HIDDEN Registers_arm {
public:
  Registers_arm();
  Registers_arm(const void *registers);

  bool        validRegister(int num) const;
  uint32_t    getRegister(int num);
  void        setRegister(int num, uint32_t value);
  bool        validFloatRegister(int num) const;
  unw_fpreg_t getFloatRegister(int num);
  void        setFloatRegister(int num, unw_fpreg_t value);
  bool        validVectorRegister(int num) const;
  v128        getVectorRegister(int num) const;
  void        setVectorRegister(int num, v128 value);
  const char *getRegisterName(int num);
  void        jumpto() {
    restoreSavedFloatRegisters();
    restoreCoreAndJumpTo();
  }

  uint32_t  getSP() const         { return _registers.__sp; }
  void      setSP(uint32_t value) { _registers.__sp = value; }
  uint32_t  getIP() const         { return _registers.__pc; }
  void      setIP(uint32_t value) { _registers.__pc = value; }

  void saveVFPAsX() {
    assert(_use_X_for_vfp_save || !_saved_vfp_d0_d15);
    _use_X_for_vfp_save = true;
  }

  void restoreSavedFloatRegisters() {
    if (_saved_vfp_d0_d15) {
      if (_use_X_for_vfp_save)
        restoreVFPWithFLDMX(_vfp_d0_d15_pad);
      else
        restoreVFPWithFLDMD(_vfp_d0_d15_pad);
    }
    if (_saved_vfp_d16_d31)
      restoreVFPv3(_vfp_d16_d31);
#if defined(__ARM_WMMX)
    if (_saved_iwmmx)
      restoreiWMMX(_iwmmx);
    if (_saved_iwmmx_control)
      restoreiWMMXControl(_iwmmx_control);
#endif
  }

private:
  struct GPRs {
    uint32_t __r[13]; // r0-r12
    uint32_t __sp;    // Stack pointer r13
    uint32_t __lr;    // Link register r14
    uint32_t __pc;    // Program counter r15
  };

  static void saveVFPWithFSTMD(unw_fpreg_t*);
  static void saveVFPWithFSTMX(unw_fpreg_t*);
  static void saveVFPv3(unw_fpreg_t*);
  static void restoreVFPWithFLDMD(unw_fpreg_t*);
  static void restoreVFPWithFLDMX(unw_fpreg_t*);
  static void restoreVFPv3(unw_fpreg_t*);
#if defined(__ARM_WMMX)
  static void saveiWMMX(unw_fpreg_t*);
  static void saveiWMMXControl(uint32_t*);
  static void restoreiWMMX(unw_fpreg_t*);
  static void restoreiWMMXControl(uint32_t*);
#endif
  void restoreCoreAndJumpTo();

  // ARM registers
  GPRs _registers;

  // We save floating point registers lazily because we can't know ahead of
  // time which ones are used. See EHABI #4.7.

  // Whether D0-D15 are saved in the FTSMX instead of FSTMD format.
  //
  // See EHABI #7.5 that explains how matching instruction sequences for load
  // and store need to be used to correctly restore the exact register bits.
  bool _use_X_for_vfp_save;
  // Whether VFP D0-D15 are saved.
  bool _saved_vfp_d0_d15;
  // Whether VFPv3 D16-D31 are saved.
  bool _saved_vfp_d16_d31;
  // VFP registers D0-D15, + padding if saved using FSTMX
  unw_fpreg_t _vfp_d0_d15_pad[17];
  // VFPv3 registers D16-D31, always saved using FSTMD
  unw_fpreg_t _vfp_d16_d31[16];
#if defined(__ARM_WMMX)
  // Whether iWMMX data registers are saved.
  bool _saved_iwmmx;
  // Whether iWMMX control registers are saved.
  bool _saved_iwmmx_control;
  // iWMMX registers
  unw_fpreg_t _iwmmx[16];
  // iWMMX control registers
  uint32_t _iwmmx_control[4];
#endif
};

inline Registers_arm::Registers_arm(const void *registers)
  : _use_X_for_vfp_save(false),
    _saved_vfp_d0_d15(false),
    _saved_vfp_d16_d31(false) {
  static_assert((check_fit<Registers_arm, unw_context_t>::does_fit),
                "arm registers do not fit into unw_context_t");
  // See unw_getcontext() note about data.
  memcpy(&_registers, registers, sizeof(_registers));
  memset(&_vfp_d0_d15_pad, 0, sizeof(_vfp_d0_d15_pad));
  memset(&_vfp_d16_d31, 0, sizeof(_vfp_d16_d31));
#if defined(__ARM_WMMX)
  _saved_iwmmx = false;
  _saved_iwmmx_control = false;
  memset(&_iwmmx, 0, sizeof(_iwmmx));
  memset(&_iwmmx_control, 0, sizeof(_iwmmx_control));
#endif
}

inline Registers_arm::Registers_arm()
  : _use_X_for_vfp_save(false),
    _saved_vfp_d0_d15(false),
    _saved_vfp_d16_d31(false) {
  memset(&_registers, 0, sizeof(_registers));
  memset(&_vfp_d0_d15_pad, 0, sizeof(_vfp_d0_d15_pad));
  memset(&_vfp_d16_d31, 0, sizeof(_vfp_d16_d31));
#if defined(__ARM_WMMX)
  _saved_iwmmx = false;
  _saved_iwmmx_control = false;  
  memset(&_iwmmx, 0, sizeof(_iwmmx));
  memset(&_iwmmx_control, 0, sizeof(_iwmmx_control));
#endif
}

inline bool Registers_arm::validRegister(int regNum) const {
  // Returns true for all non-VFP registers supported by the EHABI
  // virtual register set (VRS).
  if (regNum == UNW_REG_IP)
    return true;
  if (regNum == UNW_REG_SP)
    return true;
  if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R15)
    return true;
#if defined(__ARM_WMMX)
  if (regNum >= UNW_ARM_WC0 && regNum <= UNW_ARM_WC3)
    return true;
#endif
  return false;
}

inline uint32_t Registers_arm::getRegister(int regNum) {
  if (regNum == UNW_REG_SP || regNum == UNW_ARM_SP)
    return _registers.__sp;
  if (regNum == UNW_ARM_LR)
    return _registers.__lr;
  if (regNum == UNW_REG_IP || regNum == UNW_ARM_IP)
    return _registers.__pc;
  if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R12)
    return _registers.__r[regNum];
#if defined(__ARM_WMMX)
  if (regNum >= UNW_ARM_WC0 && regNum <= UNW_ARM_WC3) {
    if (!_saved_iwmmx_control) {
      _saved_iwmmx_control = true;
      saveiWMMXControl(_iwmmx_control);
    }
    return _iwmmx_control[regNum - UNW_ARM_WC0];
  }
#endif
  _LIBUNWIND_ABORT("unsupported arm register");
}

inline void Registers_arm::setRegister(int regNum, uint32_t value) {
  if (regNum == UNW_REG_SP || regNum == UNW_ARM_SP)
    _registers.__sp = value;
  else if (regNum == UNW_ARM_LR)
    _registers.__lr = value;
  else if (regNum == UNW_REG_IP || regNum == UNW_ARM_IP)
    _registers.__pc = value;
  else if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R12)
    _registers.__r[regNum] = value;
#if defined(__ARM_WMMX)
  else if (regNum >= UNW_ARM_WC0 && regNum <= UNW_ARM_WC3) {
    if (!_saved_iwmmx_control) {
      _saved_iwmmx_control = true;
      saveiWMMXControl(_iwmmx_control);
    }
    _iwmmx_control[regNum - UNW_ARM_WC0] = value;
  }
#endif
  else
    _LIBUNWIND_ABORT("unsupported arm register");
}

inline const char *Registers_arm::getRegisterName(int regNum) {
  switch (regNum) {
  case UNW_REG_IP:
  case UNW_ARM_IP: // UNW_ARM_R15 is alias
    return "pc";
  case UNW_ARM_LR: // UNW_ARM_R14 is alias
    return "lr";
  case UNW_REG_SP:
  case UNW_ARM_SP: // UNW_ARM_R13 is alias
    return "sp";
  case UNW_ARM_R0:
    return "r0";
  case UNW_ARM_R1:
    return "r1";
  case UNW_ARM_R2:
    return "r2";
  case UNW_ARM_R3:
    return "r3";
  case UNW_ARM_R4:
    return "r4";
  case UNW_ARM_R5:
    return "r5";
  case UNW_ARM_R6:
    return "r6";
  case UNW_ARM_R7:
    return "r7";
  case UNW_ARM_R8:
    return "r8";
  case UNW_ARM_R9:
    return "r9";
  case UNW_ARM_R10:
    return "r10";
  case UNW_ARM_R11:
    return "r11";
  case UNW_ARM_R12:
    return "r12";
  case UNW_ARM_S0:
    return "s0";
  case UNW_ARM_S1:
    return "s1";
  case UNW_ARM_S2:
    return "s2";
  case UNW_ARM_S3:
    return "s3";
  case UNW_ARM_S4:
    return "s4";
  case UNW_ARM_S5:
    return "s5";
  case UNW_ARM_S6:
    return "s6";
  case UNW_ARM_S7:
    return "s7";
  case UNW_ARM_S8:
    return "s8";
  case UNW_ARM_S9:
    return "s9";
  case UNW_ARM_S10:
    return "s10";
  case UNW_ARM_S11:
    return "s11";
  case UNW_ARM_S12:
    return "s12";
  case UNW_ARM_S13:
    return "s13";
  case UNW_ARM_S14:
    return "s14";
  case UNW_ARM_S15:
    return "s15";
  case UNW_ARM_S16:
    return "s16";
  case UNW_ARM_S17:
    return "s17";
  case UNW_ARM_S18:
    return "s18";
  case UNW_ARM_S19:
    return "s19";
  case UNW_ARM_S20:
    return "s20";
  case UNW_ARM_S21:
    return "s21";
  case UNW_ARM_S22:
    return "s22";
  case UNW_ARM_S23:
    return "s23";
  case UNW_ARM_S24:
    return "s24";
  case UNW_ARM_S25:
    return "s25";
  case UNW_ARM_S26:
    return "s26";
  case UNW_ARM_S27:
    return "s27";
  case UNW_ARM_S28:
    return "s28";
  case UNW_ARM_S29:
    return "s29";
  case UNW_ARM_S30:
    return "s30";
  case UNW_ARM_S31:
    return "s31";
  case UNW_ARM_D0:
    return "d0";
  case UNW_ARM_D1:
    return "d1";
  case UNW_ARM_D2:
    return "d2";
  case UNW_ARM_D3:
    return "d3";
  case UNW_ARM_D4:
    return "d4";
  case UNW_ARM_D5:
    return "d5";
  case UNW_ARM_D6:
    return "d6";
  case UNW_ARM_D7:
    return "d7";
  case UNW_ARM_D8:
    return "d8";
  case UNW_ARM_D9:
    return "d9";
  case UNW_ARM_D10:
    return "d10";
  case UNW_ARM_D11:
    return "d11";
  case UNW_ARM_D12:
    return "d12";
  case UNW_ARM_D13:
    return "d13";
  case UNW_ARM_D14:
    return "d14";
  case UNW_ARM_D15:
    return "d15";
  case UNW_ARM_D16:
    return "d16";
  case UNW_ARM_D17:
    return "d17";
  case UNW_ARM_D18:
    return "d18";
  case UNW_ARM_D19:
    return "d19";
  case UNW_ARM_D20:
    return "d20";
  case UNW_ARM_D21:
    return "d21";
  case UNW_ARM_D22:
    return "d22";
  case UNW_ARM_D23:
    return "d23";
  case UNW_ARM_D24:
    return "d24";
  case UNW_ARM_D25:
    return "d25";
  case UNW_ARM_D26:
    return "d26";
  case UNW_ARM_D27:
    return "d27";
  case UNW_ARM_D28:
    return "d28";
  case UNW_ARM_D29:
    return "d29";
  case UNW_ARM_D30:
    return "d30";
  case UNW_ARM_D31:
    return "d31";
  default:
    return "unknown register";
  }
}

inline bool Registers_arm::validFloatRegister(int regNum) const {
  // NOTE: Consider the intel MMX registers floating points so the
  // unw_get_fpreg can be used to transmit the 64-bit data back.
  return ((regNum >= UNW_ARM_D0) && (regNum <= UNW_ARM_D31))
#if defined(__ARM_WMMX)
      || ((regNum >= UNW_ARM_WR0) && (regNum <= UNW_ARM_WR15))
#endif
      ;
}

inline unw_fpreg_t Registers_arm::getFloatRegister(int regNum) {
  if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D15) {
    if (!_saved_vfp_d0_d15) {
      _saved_vfp_d0_d15 = true;
      if (_use_X_for_vfp_save)
        saveVFPWithFSTMX(_vfp_d0_d15_pad);
      else
        saveVFPWithFSTMD(_vfp_d0_d15_pad);
    }
    return _vfp_d0_d15_pad[regNum - UNW_ARM_D0];
  } else if (regNum >= UNW_ARM_D16 && regNum <= UNW_ARM_D31) {
    if (!_saved_vfp_d16_d31) {
      _saved_vfp_d16_d31 = true;
      saveVFPv3(_vfp_d16_d31);
    }
    return _vfp_d16_d31[regNum - UNW_ARM_D16];
  }
#if defined(__ARM_WMMX)
  else if (regNum >= UNW_ARM_WR0 && regNum <= UNW_ARM_WR15) {
    if (!_saved_iwmmx) {
      _saved_iwmmx = true;
      saveiWMMX(_iwmmx);
    }
    return _iwmmx[regNum - UNW_ARM_WR0];
  }
#endif
  else
    _LIBUNWIND_ABORT("Unknown ARM float register");
}

inline void Registers_arm::setFloatRegister(int regNum, unw_fpreg_t value) {
  if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D15) {
    if (!_saved_vfp_d0_d15) {
      _saved_vfp_d0_d15 = true;
      if (_use_X_for_vfp_save)
        saveVFPWithFSTMX(_vfp_d0_d15_pad);
      else
        saveVFPWithFSTMD(_vfp_d0_d15_pad);
    }
    _vfp_d0_d15_pad[regNum - UNW_ARM_D0] = value;
  } else if (regNum >= UNW_ARM_D16 && regNum <= UNW_ARM_D31) {
    if (!_saved_vfp_d16_d31) {
      _saved_vfp_d16_d31 = true;
      saveVFPv3(_vfp_d16_d31);
    }
    _vfp_d16_d31[regNum - UNW_ARM_D16] = value;
  }
#if defined(__ARM_WMMX)
  else if (regNum >= UNW_ARM_WR0 && regNum <= UNW_ARM_WR15) {
    if (!_saved_iwmmx) {
      _saved_iwmmx = true;
      saveiWMMX(_iwmmx);
    }
    _iwmmx[regNum - UNW_ARM_WR0] = value;
  }
#endif
  else
    _LIBUNWIND_ABORT("Unknown ARM float register");
}

inline bool Registers_arm::validVectorRegister(int) const {
  return false;
}

inline v128 Registers_arm::getVectorRegister(int) const {
  _LIBUNWIND_ABORT("ARM vector support not implemented");
}

inline void Registers_arm::setVectorRegister(int, v128) {
  _LIBUNWIND_ABORT("ARM vector support not implemented");
}
#endif // _LIBUNWIND_TARGET_ARM


#if defined(_LIBUNWIND_TARGET_OR1K)
/// Registers_or1k holds the register state of a thread in an OpenRISC1000
/// process.
class _LIBUNWIND_HIDDEN Registers_or1k {
public:
  Registers_or1k();
  Registers_or1k(const void *registers);

  bool        validRegister(int num) const;
  uint32_t    getRegister(int num) const;
  void        setRegister(int num, uint32_t value);
  bool        validFloatRegister(int num) const;
  double      getFloatRegister(int num) const;
  void        setFloatRegister(int num, double value);
  bool        validVectorRegister(int num) const;
  v128        getVectorRegister(int num) const;
  void        setVectorRegister(int num, v128 value);
  const char *getRegisterName(int num);
  void        jumpto();
  static int  lastDwarfRegNum() { return 31; }

  uint64_t  getSP() const         { return _registers.__r[1]; }
  void      setSP(uint32_t value) { _registers.__r[1] = value; }
  uint64_t  getIP() const         { return _registers.__r[9]; }
  void      setIP(uint32_t value) { _registers.__r[9] = value; }

private:
  struct or1k_thread_state_t {
    unsigned int __r[32];
  };

  or1k_thread_state_t _registers;
};

inline Registers_or1k::Registers_or1k(const void *registers) {
  static_assert((check_fit<Registers_or1k, unw_context_t>::does_fit),
                "or1k registers do not fit into unw_context_t");
  memcpy(&_registers, static_cast<const uint8_t *>(registers),
         sizeof(_registers));
}

inline Registers_or1k::Registers_or1k() {
  memset(&_registers, 0, sizeof(_registers));
}

inline bool Registers_or1k::validRegister(int regNum) const {
  if (regNum == UNW_REG_IP)
    return true;
  if (regNum == UNW_REG_SP)
    return true;
  if (regNum < 0)
    return false;
  if (regNum <= UNW_OR1K_R31)
    return true;
  return false;
}

inline uint32_t Registers_or1k::getRegister(int regNum) const {
  if (regNum >= UNW_OR1K_R0 && regNum <= UNW_OR1K_R31)
    return _registers.__r[regNum - UNW_OR1K_R0];

  switch (regNum) {
  case UNW_REG_IP:
    return _registers.__r[9];
  case UNW_REG_SP:
    return _registers.__r[1];
  }
  _LIBUNWIND_ABORT("unsupported or1k register");
}

inline void Registers_or1k::setRegister(int regNum, uint32_t value) {
  if (regNum >= UNW_OR1K_R0 && regNum <= UNW_OR1K_R31) {
    _registers.__r[regNum - UNW_OR1K_R0] = value;
    return;
  }

  switch (regNum) {
  case UNW_REG_IP:
    _registers.__r[9] = value;
    return;
  case UNW_REG_SP:
    _registers.__r[1] = value;
    return;
  }
  _LIBUNWIND_ABORT("unsupported or1k register");
}

inline bool Registers_or1k::validFloatRegister(int /* regNum */) const {
  return false;
}

inline double Registers_or1k::getFloatRegister(int /* regNum */) const {
  _LIBUNWIND_ABORT("or1k float support not implemented");
}

inline void Registers_or1k::setFloatRegister(int /* regNum */,
                                             double /* value */) {
  _LIBUNWIND_ABORT("or1k float support not implemented");
}

inline bool Registers_or1k::validVectorRegister(int /* regNum */) const {
  return false;
}

inline v128 Registers_or1k::getVectorRegister(int /* regNum */) const {
  _LIBUNWIND_ABORT("or1k vector support not implemented");
}

inline void Registers_or1k::setVectorRegister(int /* regNum */, v128 /* value */) {
  _LIBUNWIND_ABORT("or1k vector support not implemented");
}

inline const char *Registers_or1k::getRegisterName(int regNum) {
  switch (regNum) {
  case UNW_OR1K_R0:
    return "r0";
  case UNW_OR1K_R1:
    return "r1";
  case UNW_OR1K_R2:
    return "r2";
  case UNW_OR1K_R3:
    return "r3";
  case UNW_OR1K_R4:
    return "r4";
  case UNW_OR1K_R5:
    return "r5";
  case UNW_OR1K_R6:
    return "r6";
  case UNW_OR1K_R7:
    return "r7";
  case UNW_OR1K_R8:
    return "r8";
  case UNW_OR1K_R9:
    return "r9";
  case UNW_OR1K_R10:
    return "r10";
  case UNW_OR1K_R11:
    return "r11";
  case UNW_OR1K_R12:
    return "r12";
  case UNW_OR1K_R13:
    return "r13";
  case UNW_OR1K_R14:
    return "r14";
  case UNW_OR1K_R15:
    return "r15";
  case UNW_OR1K_R16:
    return "r16";
  case UNW_OR1K_R17:
    return "r17";
  case UNW_OR1K_R18:
    return "r18";
  case UNW_OR1K_R19:
    return "r19";
  case UNW_OR1K_R20:
    return "r20";
  case UNW_OR1K_R21:
    return "r21";
  case UNW_OR1K_R22:
    return "r22";
  case UNW_OR1K_R23:
    return "r23";
  case UNW_OR1K_R24:
    return "r24";
  case UNW_OR1K_R25:
    return "r25";
  case UNW_OR1K_R26:
    return "r26";
  case UNW_OR1K_R27:
    return "r27";
  case UNW_OR1K_R28:
    return "r28";
  case UNW_OR1K_R29:
    return "r29";
  case UNW_OR1K_R30:
    return "r30";
  case UNW_OR1K_R31:
    return "r31";
  default:
    return "unknown register";
  }

}
#endif // _LIBUNWIND_TARGET_OR1K
} // namespace libunwind

#endif // __REGISTERS_HPP__