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# if OS(ANDROID) && PLATFORM(QT) && !defined(HAVE_asm_hwcap_h)
40# include <asm/procinfo.h>
41# else
42# include <asm/hwcap.h>
43# endif
44#endif
45
46namespace JSC {
47
48static bool isVFPPresent()
49{
50#if OS(LINUX)
51 int fd = open("/proc/self/auxv", O_RDONLY);
52 if (fd > 0) {
53 Elf32_auxv_t aux;
54 while (read(fd, &aux, sizeof(Elf32_auxv_t))) {
55 if (aux.a_type == AT_HWCAP) {
56 close(fd);
57 return aux.a_un.a_val & HWCAP_VFP;
58 }
59 }
60 close(fd);
61 }
62#endif
63 return false;
64}
65
66const bool MacroAssemblerARM::s_isVFPPresent = isVFPPresent();
67
68#if CPU(ARMV5_OR_LOWER)
69/* On ARMv5 and below, natural alignment is required. */
70void MacroAssemblerARM::load32WithUnalignedHalfWords(BaseIndex address, RegisterID dest)
71{
72 ARMWord op2;
73
74 ASSERT(address.scale >= 0 && address.scale <= 3);
75 op2 = m_assembler.lsl(address.index, static_cast<int>(address.scale));
76
77 if (address.offset >= 0 && address.offset + 0x2 <= 0xff) {
78 m_assembler.add_r(ARMRegisters::S0, address.base, op2);
79 m_assembler.ldrh_u(dest, ARMRegisters::S0, ARMAssembler::getOp2Byte(address.offset));
80 m_assembler.ldrh_u(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Byte(address.offset + 0x2));
81 } else if (address.offset < 0 && address.offset >= -0xff) {
82 m_assembler.add_r(ARMRegisters::S0, address.base, op2);
83 m_assembler.ldrh_d(dest, ARMRegisters::S0, ARMAssembler::getOp2Byte(-address.offset));
84 m_assembler.ldrh_d(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Byte(-address.offset - 0x2));
85 } else {
86 m_assembler.ldr_un_imm(ARMRegisters::S0, address.offset);
87 m_assembler.add_r(ARMRegisters::S0, ARMRegisters::S0, op2);
88 m_assembler.ldrh_r(dest, address.base, ARMRegisters::S0);
89 m_assembler.add_r(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::OP2_IMM | 0x2);
90 m_assembler.ldrh_r(ARMRegisters::S0, address.base, ARMRegisters::S0);
91 }
92 m_assembler.orr_r(dest, dest, m_assembler.lsl(ARMRegisters::S0, 16));
93}
94#endif
95
96}
97
98#endif // ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL)
99

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/assembler/MacroAssemblerARM.cpp