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
isVFPPresent()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. */
load32WithUnalignedHalfWords(BaseIndex address,RegisterID dest)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