1/* 2 * Copyright (C) 2011, 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 "DFGThunks.h" 28 29#if ENABLE(DFG_JIT) 30 31#include "CCallHelpers.h" 32#include "DFGOSRExitCompiler.h" 33#include "FPRInfo.h" 34#include "GPRInfo.h" 35#include "LinkBuffer.h" 36#include "MacroAssembler.h" 37#include "JSCInlines.h" 38 39namespace JSC { namespace DFG { 40 41MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM* vm) 42{ 43 MacroAssembler jit; 44 45 size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters); 46 ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(scratchSize); 47 EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer()); 48 49 for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) { 50#if USE(JSVALUE64) 51 jit.store64(GPRInfo::toRegister(i), buffer + i); 52#else 53 jit.store32(GPRInfo::toRegister(i), buffer + i); 54#endif 55 } 56 for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) { 57 jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0); 58 jit.storeDouble(FPRInfo::toRegister(i), MacroAssembler::Address(GPRInfo::regT0)); 59 } 60 61 // Tell GC mark phase how much of the scratch buffer is active during call. 62 jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0); 63 jit.storePtr(MacroAssembler::TrustedImmPtr(scratchSize), MacroAssembler::Address(GPRInfo::regT0)); 64 65 // Set up one argument. 66#if CPU(X86) 67 jit.poke(GPRInfo::callFrameRegister, 0); 68#else 69 jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0); 70#endif 71 72 MacroAssembler::Call functionCall = jit.call(); 73 74 jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0); 75 jit.storePtr(MacroAssembler::TrustedImmPtr(0), MacroAssembler::Address(GPRInfo::regT0)); 76 77 for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) { 78 jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0); 79 jit.loadDouble(MacroAssembler::Address(GPRInfo::regT0), FPRInfo::toRegister(i)); 80 } 81 for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) { 82#if USE(JSVALUE64) 83 jit.load64(buffer + i, GPRInfo::toRegister(i)); 84#else 85 jit.load32(buffer + i, GPRInfo::toRegister(i)); 86#endif 87 } 88 89 jit.jump(MacroAssembler::AbsoluteAddress(&vm->osrExitJumpDestination)); 90 91 LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID); 92 93 patchBuffer.link(functionCall, compileOSRExit); 94 95 return FINALIZE_CODE(patchBuffer, ("DFG OSR exit generation thunk")); 96} 97 98MacroAssemblerCodeRef osrEntryThunkGenerator(VM* vm) 99{ 100 MacroAssembler jit; 101 102 // We get passed the address of a scratch buffer. The first 8-byte slot of the buffer 103 // is the frame size. The second 8-byte slot is the pointer to where we are supposed to 104 // jump. The remaining bytes are the new call frame header followed by the locals. 105 106 ptrdiff_t offsetOfFrameSize = 0; // This is the DFG frame count. 107 ptrdiff_t offsetOfTargetPC = offsetOfFrameSize + sizeof(EncodedJSValue); 108 ptrdiff_t offsetOfPayload = offsetOfTargetPC + sizeof(EncodedJSValue); 109 ptrdiff_t offsetOfLocals = offsetOfPayload + sizeof(Register) * JSStack::CallFrameHeaderSize; 110 111 jit.move(GPRInfo::returnValueGPR2, GPRInfo::regT0); 112 jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfFrameSize), GPRInfo::regT1); // Load the frame size. 113 jit.move(GPRInfo::regT1, GPRInfo::regT2); 114 jit.lshiftPtr(MacroAssembler::Imm32(3), GPRInfo::regT2); 115 jit.move(GPRInfo::callFrameRegister, MacroAssembler::stackPointerRegister); 116 jit.subPtr(GPRInfo::regT2, MacroAssembler::stackPointerRegister); 117 118 MacroAssembler::Label loop = jit.label(); 119 jit.subPtr(MacroAssembler::TrustedImm32(1), GPRInfo::regT1); 120 jit.move(GPRInfo::regT1, GPRInfo::regT4); 121 jit.negPtr(GPRInfo::regT4); 122 jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals), GPRInfo::regT2); 123 jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals + sizeof(int32_t)), GPRInfo::regT3); 124 jit.store32(GPRInfo::regT2, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register)))); 125 jit.store32(GPRInfo::regT3, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register)) + static_cast<intptr_t>(sizeof(int32_t)))); 126 jit.branchPtr(MacroAssembler::NotEqual, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(-static_cast<intptr_t>(JSStack::CallFrameHeaderSize)))).linkTo(loop, &jit); 127 128 jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfTargetPC), GPRInfo::regT1); 129 MacroAssembler::Jump ok = jit.branchPtr(MacroAssembler::Above, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(static_cast<intptr_t>(1000)))); 130 jit.abortWithReason(DFGUnreasonableOSREntryJumpDestination); 131 ok.link(&jit); 132 jit.jump(GPRInfo::regT1); 133 134 LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID); 135 return FINALIZE_CODE(patchBuffer, ("DFG OSR entry thunk")); 136} 137 138} } // namespace JSC::DFG 139 140#endif // ENABLE(DFG_JIT) 141