assembler/MacroAssemblerARM.cpp

   1 /*
   2  * Copyright (C) 2013 Apple Inc.
   3  * Copyright (C) 2009 University of Szeged
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
  16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "config.h"
  29
  30 #if ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL)
  31
  32 #include "MacroAssemblerARM.h"
  33
  34 #if USE(MASM_PROBE)
  35 #include <wtf/StdLibExtras.h>
  36 #endif
  37
  38 #if OS(LINUX)
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <fcntl.h>
  42 #include <unistd.h>
  43 #include <elf.h>
  44 #include <asm/hwcap.h>
  45 #endif
  46
  47 namespace JSC {
  48
  49 static bool isVFPPresent()
  50 {
  51 #if OS(LINUX)
  52     int fd = open("/proc/self/auxv", O_RDONLY);
  53     if (fd > 0) {
  54         Elf32_auxv_t aux;
  55         while (read(fd, &aux, sizeof(Elf32_auxv_t))) {
  56             if (aux.a_type == AT_HWCAP) {
  57                 close(fd);
  58                 return aux.a_un.a_val & HWCAP_VFP;
  59             }
  60         }
  61         close(fd);
  62     }
  63 #endif // OS(LINUX)
  64
  65 #if (COMPILER(GCC) && defined(__VFP_FP__))
  66     return true;
  67 #else
  68     return false;
  69 #endif
  70 }
  71
  72 const bool MacroAssemblerARM::s_isVFPPresent = isVFPPresent();
  73
  74 #if CPU(ARMV5_OR_LOWER)
  75 /* On ARMv5 and below, natural alignment is required. */
  76 void MacroAssemblerARM::load32WithUnalignedHalfWords(BaseIndex address, RegisterID dest)
  77 {
  78     ARMWord op2;
  79
  80     ASSERT(address.scale >= 0 && address.scale <= 3);
  81     op2 = m_assembler.lsl(address.index, static_cast<int>(address.scale));
  82
  83     if (address.offset >= 0 && address.offset + 0x2 <= 0xff) {
  84         m_assembler.add(ARMRegisters::S0, address.base, op2);
  85         m_assembler.halfDtrUp(ARMAssembler::LoadUint16, dest, ARMRegisters::S0, ARMAssembler::getOp2Half(address.offset));
  86         m_assembler.halfDtrUp(ARMAssembler::LoadUint16, ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Half(address.offset + 0x2));
  87     } else if (address.offset < 0 && address.offset >= -0xff) {
  88         m_assembler.add(ARMRegisters::S0, address.base, op2);
  89         m_assembler.halfDtrDown(ARMAssembler::LoadUint16, dest, ARMRegisters::S0, ARMAssembler::getOp2Half(-address.offset));
  90         m_assembler.halfDtrDown(ARMAssembler::LoadUint16, ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::getOp2Half(-address.offset - 0x2));
  91     } else {
  92         m_assembler.moveImm(address.offset, ARMRegisters::S0);
  93         m_assembler.add(ARMRegisters::S0, ARMRegisters::S0, op2);
  94         m_assembler.halfDtrUpRegister(ARMAssembler::LoadUint16, dest, address.base, ARMRegisters::S0);
  95         m_assembler.add(ARMRegisters::S0, ARMRegisters::S0, ARMAssembler::Op2Immediate | 0x2);
  96         m_assembler.halfDtrUpRegister(ARMAssembler::LoadUint16, ARMRegisters::S0, address.base, ARMRegisters::S0);
  97     }
  98     m_assembler.orr(dest, dest, m_assembler.lsl(ARMRegisters::S0, 16));
  99 }
 100 #endif // CPU(ARMV5_OR_LOWER)
 101
 102 #if USE(MASM_PROBE)
 103
 104 void MacroAssemblerARM::ProbeContext::dumpCPURegisters(const char* indentation)
 105 {
 106     #define DUMP_GPREGISTER(_type, _regName) { \
 107         int32_t value = reinterpret_cast<int32_t>(cpu._regName); \
 108         dataLogF("%s    %5s: 0x%08x   %d\n", indentation, #_regName, value, value) ; \
 109     }
 110     FOR_EACH_CPU_GPREGISTER(DUMP_GPREGISTER)
 111     FOR_EACH_CPU_SPECIAL_REGISTER(DUMP_GPREGISTER)
 112     #undef DUMP_GPREGISTER
 113
 114     #define DUMP_FPREGISTER(_type, _regName) { \
 115         uint32_t* u = reinterpret_cast<uint32_t*>(&cpu._regName); \
 116         double* d = reinterpret_cast<double*>(&cpu._regName); \
 117         dataLogF("%s    %5s: 0x %08x %08x   %12g\n", \
 118             indentation, #_regName, u[1], u[0], d[0]); \
 119     }
 120     FOR_EACH_CPU_FPREGISTER(DUMP_FPREGISTER)
 121     #undef DUMP_FPREGISTER
 122 }
 123
 124 void MacroAssemblerARM::ProbeContext::dump(const char* indentation)
 125 {
 126     if (!indentation)
 127         indentation = "";
 128
 129     dataLogF("%sProbeContext %p {\n", indentation, this);
 130     dataLogF("%s  probeFunction: %p\n", indentation, probeFunction);
 131     dataLogF("%s  arg1: %p %llu\n", indentation, arg1, reinterpret_cast<int64_t>(arg1));
 132     dataLogF("%s  arg2: %p %llu\n", indentation, arg2, reinterpret_cast<int64_t>(arg2));
 133     dataLogF("%s  cpu: {\n", indentation);
 134
 135     dumpCPURegisters(indentation);
 136
 137     dataLogF("%s  }\n", indentation);
 138     dataLogF("%s}\n", indentation);
 139 }
 140
 141
 142 extern "C" void ctiMasmProbeTrampoline();
 143
 144 // For details on "What code is emitted for the probe?" and "What values are in
 145 // the saved registers?", see comment for MacroAssemblerX86::probe() in
 146 // MacroAssemblerX86_64.h.
 147
 148 void MacroAssemblerARM::probe(MacroAssemblerARM::ProbeFunction function, void* arg1, void* arg2)
 149 {
 150     push(RegisterID::sp);
 151     push(RegisterID::lr);
 152     push(RegisterID::ip);
 153     push(RegisterID::S0);
 154     // The following uses RegisterID::S0. So, they must come after we push S0 above.
 155     push(trustedImm32FromPtr(arg2));
 156     push(trustedImm32FromPtr(arg1));
 157     push(trustedImm32FromPtr(function));
 158
 159     move(trustedImm32FromPtr(ctiMasmProbeTrampoline), RegisterID::S0);
 160     m_assembler.blx(RegisterID::S0);
 161
 162 }
 163 #endif // USE(MASM_PROBE)
 164
 165 } // namespace JSC
 166
 167 #endif // ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL)