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
42namespace JSC {
43
44static 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
63const bool MacroAssemblerARM::s_isVFPPresent = isVFPPresent();
64
65#if CPU(ARMV5_OR_LOWER)
66/* On ARMv5 and below, natural alignment is required. */
67void 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