1/* 2 * Copyright (C) 2013, 2014 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "FTLSaveRestore.h" 28 29#if ENABLE(FTL_JIT) 30 31#include "FPRInfo.h" 32#include "GPRInfo.h" 33#include "MacroAssembler.h" 34#include "RegisterSet.h" 35 36namespace JSC { namespace FTL { 37 38static size_t bytesForGPRs() 39{ 40 return MacroAssembler::numberOfRegisters() * sizeof(int64_t); 41} 42 43static size_t bytesForFPRs() 44{ 45 // FIXME: It might be worthwhile saving the full state of the FP registers, at some point. 46 // Right now we don't need this since we only do the save/restore just prior to OSR exit, and 47 // OSR exit will be guaranteed to only need the double portion of the FP registers. 48 return MacroAssembler::numberOfFPRegisters() * sizeof(double); 49} 50 51size_t requiredScratchMemorySizeInBytes() 52{ 53 return bytesForGPRs() + bytesForFPRs(); 54} 55 56size_t offsetOfGPR(GPRReg reg) 57{ 58 return MacroAssembler::registerIndex(reg) * sizeof(int64_t); 59} 60 61size_t offsetOfFPR(FPRReg reg) 62{ 63 return bytesForGPRs() + MacroAssembler::fpRegisterIndex(reg) * sizeof(double); 64} 65 66size_t offsetOfReg(Reg reg) 67{ 68 if (reg.isGPR()) 69 return offsetOfGPR(reg.gpr()); 70 return offsetOfFPR(reg.fpr()); 71} 72 73namespace { 74 75struct Regs { 76 Regs() 77 { 78 special = RegisterSet::stackRegisters(); 79 special.merge(RegisterSet::reservedHardwareRegisters()); 80 81 first = MacroAssembler::firstRegister(); 82 while (special.get(first)) 83 first = MacroAssembler::nextRegister(first); 84 second = MacroAssembler::nextRegister(first); 85 while (special.get(second)) 86 second = MacroAssembler::nextRegister(second); 87 } 88 89 RegisterSet special; 90 GPRReg first; 91 GPRReg second; 92}; 93 94} // anonymous namespace 95 96void saveAllRegisters(MacroAssembler& jit, char* scratchMemory) 97{ 98 Regs regs; 99 100 // Get the first register out of the way, so that we can use it as a pointer. 101 jit.poke64(regs.first, 0); 102 jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), regs.first); 103 104 // Get all of the other GPRs out of the way. 105 for (MacroAssembler::RegisterID reg = regs.second; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) { 106 if (regs.special.get(reg)) 107 continue; 108 jit.store64(reg, MacroAssembler::Address(regs.first, offsetOfGPR(reg))); 109 } 110 111 // Restore the first register into the second one and save it. 112 jit.peek64(regs.second, 0); 113 jit.store64(regs.second, MacroAssembler::Address(regs.first, offsetOfGPR(regs.first))); 114 115 // Finally save all FPR's. 116 for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) { 117 if (regs.special.get(reg)) 118 continue; 119 jit.storeDouble(reg, MacroAssembler::Address(regs.first, offsetOfFPR(reg))); 120 } 121} 122 123void restoreAllRegisters(MacroAssembler& jit, char* scratchMemory) 124{ 125 Regs regs; 126 127 // Give ourselves a pointer to the scratch memory. 128 jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), regs.first); 129 130 // Restore all FPR's. 131 for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) { 132 if (regs.special.get(reg)) 133 continue; 134 jit.loadDouble(MacroAssembler::Address(regs.first, offsetOfFPR(reg)), reg); 135 } 136 137 for (MacroAssembler::RegisterID reg = regs.second; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) { 138 if (regs.special.get(reg)) 139 continue; 140 jit.load64(MacroAssembler::Address(regs.first, offsetOfGPR(reg)), reg); 141 } 142 143 jit.load64(MacroAssembler::Address(regs.first, offsetOfGPR(regs.first)), regs.first); 144} 145 146} } // namespace JSC::FTL 147 148#endif // ENABLE(FTL_JIT) 149 150