/* * Copyright (C) 2013, 2014 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #if ENABLE(ASSEMBLER) && (CPU(X86) || CPU(X86_64)) #include "MacroAssemblerX86Common.h" namespace JSC { #if ENABLE(MASM_PROBE) #define INDENT printIndent(indentation) void MacroAssemblerX86Common::printCPURegisters(MacroAssemblerX86Common::CPUState& cpu, int indentation) { #if CPU(X86) #define PRINT_GPREGISTER(_type, _regName) { \ int32_t value = reinterpret_cast<int32_t>(cpu._regName); \ INDENT, dataLogF("%6s: 0x%08x %d\n", #_regName, value, value) ; \ } #elif CPU(X86_64) #define PRINT_GPREGISTER(_type, _regName) { \ int64_t value = reinterpret_cast<int64_t>(cpu._regName); \ INDENT, dataLogF("%6s: 0x%016llx %lld\n", #_regName, value, value) ; \ } #endif FOR_EACH_CPU_GPREGISTER(PRINT_GPREGISTER) FOR_EACH_CPU_SPECIAL_REGISTER(PRINT_GPREGISTER) #undef PRINT_GPREGISTER #define PRINT_FPREGISTER(_type, _regName) { \ uint64_t* u = reinterpret_cast<uint64_t*>(&cpu._regName); \ double* d = reinterpret_cast<double*>(&cpu._regName); \ INDENT, dataLogF("%6s: 0x%016llx %.13g\n", #_regName, *u, *d); \ } FOR_EACH_CPU_FPREGISTER(PRINT_FPREGISTER) #undef PRINT_FPREGISTER } #undef INDENT void MacroAssemblerX86Common::printRegister(MacroAssemblerX86Common::CPUState& cpu, RegisterID regID) { const char* name = CPUState::registerName(regID); union { void* voidPtr; intptr_t intptrValue; } u; u.voidPtr = cpu.registerValue(regID); dataLogF("%s:<%p %ld>", name, u.voidPtr, u.intptrValue); } void MacroAssemblerX86Common::printRegister(MacroAssemblerX86Common::CPUState& cpu, FPRegisterID regID) { const char* name = CPUState::registerName(regID); union { double doubleValue; uint64_t uint64Value; } u; u.doubleValue = cpu.registerValue(regID); dataLogF("%s:<0x%016llx %.13g>", name, u.uint64Value, u.doubleValue); } extern "C" void ctiMasmProbeTrampoline(); // What code is emitted for the probe? // ================================== // We want to keep the size of the emitted probe invocation code as compact as // possible to minimize the perturbation to the JIT generated code. However, // we also need to preserve the CPU registers and set up the ProbeContext to be // passed to the user probe function. // // Hence, we do only the minimum here to preserve a scratch register (i.e. rax // in this case) and the stack pointer (i.e. rsp), and pass the probe arguments. // We'll let the ctiMasmProbeTrampoline handle the rest of the probe invocation // work i.e. saving the CPUState (and setting up the ProbeContext), calling the // user probe function, and restoring the CPUState before returning to JIT // generated code. // // What registers need to be saved? // =============================== // The registers are saved for 2 reasons: // 1. To preserve their state in the JITted code. This means that all registers // that are not callee saved needs to be saved. We also need to save the // condition code registers because the probe can be inserted between a test // and a branch. // 2. To allow the probe to inspect the values of the registers for debugging // purposes. This means all registers need to be saved. // // In summary, save everything. But for reasons stated above, we should do the // minimum here and let ctiMasmProbeTrampoline do the heavy lifting to save the // full set. // // What values are in the saved registers? // ====================================== // Conceptually, the saved registers should contain values as if the probe // is not present in the JIT generated code. Hence, they should contain values // that are expected at the start of the instruction immediately following the // probe. // // Specifically, the saved stack pointer register will point to the stack // position before we push the ProbeContext frame. The saved rip will point to // the address of the instruction immediately following the probe. void MacroAssemblerX86Common::probe(MacroAssemblerX86Common::ProbeFunction function, void* arg1, void* arg2) { push(RegisterID::esp); push(RegisterID::eax); move(TrustedImmPtr(arg2), RegisterID::eax); push(RegisterID::eax); move(TrustedImmPtr(arg1), RegisterID::eax); push(RegisterID::eax); move(TrustedImmPtr(reinterpret_cast<void*>(function)), RegisterID::eax); push(RegisterID::eax); move(TrustedImmPtr(reinterpret_cast<void*>(ctiMasmProbeTrampoline)), RegisterID::eax); call(RegisterID::eax); } #endif // ENABLE(MASM_PROBE) #if CPU(X86) && !OS(MAC_OS_X) MacroAssemblerX86Common::SSE2CheckState MacroAssemblerX86Common::s_sse2CheckState = NotCheckedSSE2; #endif } // namespace JSC #endif // ENABLE(ASSEMBLER) && (CPU(X86) || CPU(X86_64))