text: /*
   * Copyright (C) 2009 University of Szeged
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  
  #if ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL)
  
  #include "MacroAssemblerARM.h"
  
  #if OS(LINUX)
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <unistd.h>
  #include <elf.h>
  #include <asm/hwcap.h>
  #endif
  
  namespace JSC {
  
  static bool isVFPPresent()
  {
  #if OS(LINUX)
      int fd = open("/proc/self/auxv", O_RDONLY);
      if (fd > 0) {
          Elf32_auxv_t aux;
          while (read(fd, &aux, sizeof(Elf32_auxv_t))) {
              if (aux.a_type == AT_HWCAP) {
                  close(fd);
                  return aux.a_un.a_val & HWCAP_VFP;
              }
          }
          close(fd);
      }
  #endif
  
  #if (COMPILER(RVCT) && defined(__TARGET_FPU_VFP)) || (COMPILER(GCC) && defined(__VFP_FP__))
      return true;
  #else
      return false;
  #endif
  }
  
  const bool MacroAssemblerARM::s_isVFPPresent = isVFPPresent();
  
  #if CPU(ARMV5_OR_LOWER)
  /* On ARMv5 and below, natural alignment is required. */
  void MacroAssemblerARM::load32WithUnalignedHalfWords(BaseIndex address, RegisterID dest)
  {
      ARMWord op2;
  
      ASSERT(address.scale >= 0 && address.scale <= 3);
      op2 = m_assembler.lsl(address.index, static_cast<int>(address.scale));
  
      if (address.offset >= 0 && address.offset + 0x2 <= 0xff) {
          m_assembler.add_r(ARMRegisters::S0, address.base, op2);
          m_assembler.ldrh_u(dest, ARMRegisters::S0, ARMAssembler::getOp2Byte(address.offset));
          m_assembler.ldrh_u(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Byte(address.offset + 0x2));
      } else if (address.offset < 0 && address.offset >= -0xff) {
          m_assembler.add_r(ARMRegisters::S0, address.base, op2);
          m_assembler.ldrh_d(dest, ARMRegisters::S0, ARMAssembler::getOp2Byte(-address.offset));
          m_assembler.ldrh_d(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Byte(-address.offset - 0x2));
      } else {
          m_assembler.ldr_un_imm(ARMRegisters::S0, address.offset);
          m_assembler.add_r(ARMRegisters::S0, ARMRegisters::S0, op2);
          m_assembler.ldrh_r(dest, address.base, ARMRegisters::S0);
          m_assembler.add_r(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::OP2_IMM | 0x2);
          m_assembler.ldrh_r(ARMRegisters::S0, address.base, ARMRegisters::S0);
      }
      m_assembler.orr_r(dest, dest, m_assembler.lsl(ARMRegisters::S0, 16));
  }
  #endif
  
  }
  
  #endif // ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL)
  