1 /* 2 * Copyright (C) 2009 University of Szeged 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "config.h" 28 29 #if ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL) 30 31 #include "MacroAssemblerARM.h" 32 33 #if OS(LINUX) 34 #include <sys/types.h> 35 #include <sys/stat.h> 36 #include <fcntl.h> 37 #include <unistd.h> 38 #include <elf.h> 39 #include <asm/hwcap.h> 40 #endif 41 42 namespace JSC { 43 44 static bool isVFPPresent() 45 { 46 #if OS(LINUX) 47 int fd = open("/proc/self/auxv", O_RDONLY); 48 if (fd > 0) { 49 Elf32_auxv_t aux; 50 while (read(fd, &aux, sizeof(Elf32_auxv_t))) { 51 if (aux.a_type == AT_HWCAP) { 52 close(fd); 53 return aux.a_un.a_val & HWCAP_VFP; 54 } 55 } 56 close(fd); 57 } 58 #endif 59 60 return false; 61 } 62 63 const bool MacroAssemblerARM::s_isVFPPresent = isVFPPresent(); 64 65 #if CPU(ARMV5_OR_LOWER) 66 /* On ARMv5 and below, natural alignment is required. */ 67 void MacroAssemblerARM::load32WithUnalignedHalfWords(BaseIndex address, RegisterID dest) 68 { 69 ARMWord op2; 70 71 ASSERT(address.scale >= 0 && address.scale <= 3); 72 op2 = m_assembler.lsl(address.index, static_cast<int>(address.scale)); 73 74 if (address.offset >= 0 && address.offset + 0x2 <= 0xff) { 75 m_assembler.add_r(ARMRegisters::S0, address.base, op2); 76 m_assembler.ldrh_u(dest, ARMRegisters::S0, ARMAssembler::getOp2Byte(address.offset)); 77 m_assembler.ldrh_u(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Byte(address.offset + 0x2)); 78 } else if (address.offset < 0 && address.offset >= -0xff) { 79 m_assembler.add_r(ARMRegisters::S0, address.base, op2); 80 m_assembler.ldrh_d(dest, ARMRegisters::S0, ARMAssembler::getOp2Byte(-address.offset)); 81 m_assembler.ldrh_d(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Byte(-address.offset - 0x2)); 82 } else { 83 m_assembler.ldr_un_imm(ARMRegisters::S0, address.offset); 84 m_assembler.add_r(ARMRegisters::S0, ARMRegisters::S0, op2); 85 m_assembler.ldrh_r(dest, address.base, ARMRegisters::S0); 86 m_assembler.add_r(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::OP2_IMM | 0x2); 87 m_assembler.ldrh_r(ARMRegisters::S0, address.base, ARMRegisters::S0); 88 } 89 m_assembler.orr_r(dest, dest, m_assembler.lsl(ARMRegisters::S0, 16)); 90 } 91 #endif 92 93 } 94 95 #endif // ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL) 96
