131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "context_x86_64.h"
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#include "base/bit_utils.h"
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#include "base/bit_utils_iterator.h"
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#include "quick/quick_method_frame_info.h"
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namespace art {
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namespace x86_64 {
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static constexpr uintptr_t gZero = 0;
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void X86_64Context::Reset() {
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std::fill_n(gprs_, arraysize(gprs_), nullptr);
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std::fill_n(fprs_, arraysize(fprs_), nullptr);
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gprs_[RSP] = &rsp_;
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gprs_[RDI] = &arg0_;
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// Initialize registers with easy to spot debug values.
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rsp_ = X86_64Context::kBadGprBase + RSP;
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rip_ = X86_64Context::kBadGprBase + kNumberOfCpuRegisters;
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arg0_ = 0;
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}
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void X86_64Context::FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& frame_info) {
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int spill_pos = 0;
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// Core registers come first, from the highest down to the lowest.
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uint32_t core_regs =
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frame_info.CoreSpillMask() & ~(static_cast<uint32_t>(-1) << kNumberOfCpuRegisters);
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DCHECK_EQ(1, POPCOUNT(frame_info.CoreSpillMask() & ~core_regs)); // Return address spill.
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for (uint32_t core_reg : HighToLowBits(core_regs)) {
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gprs_[core_reg] = CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes());
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++spill_pos;
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}
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DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) - 1);
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// FP registers come second, from the highest down to the lowest.
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uint32_t fp_regs = frame_info.FpSpillMask();
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DCHECK_EQ(0u, fp_regs & (static_cast<uint32_t>(-1) << kNumberOfFloatRegisters));
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for (uint32_t fp_reg : HighToLowBits(fp_regs)) {
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fprs_[fp_reg] = reinterpret_cast<uint64_t*>(
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CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes()));
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++spill_pos;
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}
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DCHECK_EQ(spill_pos,
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POPCOUNT(frame_info.CoreSpillMask()) - 1 + POPCOUNT(frame_info.FpSpillMask()));
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}
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void X86_64Context::SmashCallerSaves() {
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// This needs to be 0 because we want a null/zero return value.
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gprs_[RAX] = const_cast<uintptr_t*>(&gZero);
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gprs_[RDX] = const_cast<uintptr_t*>(&gZero);
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gprs_[RCX] = nullptr;
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gprs_[RSI] = nullptr;
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gprs_[RDI] = nullptr;
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gprs_[R8] = nullptr;
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gprs_[R9] = nullptr;
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gprs_[R10] = nullptr;
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gprs_[R11] = nullptr;
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fprs_[XMM0] = nullptr;
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fprs_[XMM1] = nullptr;
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fprs_[XMM2] = nullptr;
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fprs_[XMM3] = nullptr;
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fprs_[XMM4] = nullptr;
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fprs_[XMM5] = nullptr;
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fprs_[XMM6] = nullptr;
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fprs_[XMM7] = nullptr;
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fprs_[XMM8] = nullptr;
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fprs_[XMM9] = nullptr;
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fprs_[XMM10] = nullptr;
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fprs_[XMM11] = nullptr;
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}
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void X86_64Context::SetGPR(uint32_t reg, uintptr_t value) {
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CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
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DCHECK(IsAccessibleGPR(reg));
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CHECK_NE(gprs_[reg], &gZero);
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*gprs_[reg] = value;
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}
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void X86_64Context::SetFPR(uint32_t reg, uintptr_t value) {
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CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
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DCHECK(IsAccessibleFPR(reg));
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CHECK_NE(fprs_[reg], reinterpret_cast<const uint64_t*>(&gZero));
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*fprs_[reg] = value;
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}
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extern "C" NO_RETURN void art_quick_do_long_jump(uintptr_t*, uintptr_t*);
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void X86_64Context::DoLongJump() {
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#if defined(__x86_64__)
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uintptr_t gprs[kNumberOfCpuRegisters + 1];
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uintptr_t fprs[kNumberOfFloatRegisters];
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for (size_t i = 0; i < kNumberOfCpuRegisters; ++i) {
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gprs[kNumberOfCpuRegisters - i - 1] = gprs_[i] != nullptr ? *gprs_[i] : X86_64Context::kBadGprBase + i;
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}
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for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
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fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : X86_64Context::kBadFprBase + i;
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}
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// We want to load the stack pointer one slot below so that the ret will pop eip.
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uintptr_t rsp = gprs[kNumberOfCpuRegisters - RSP - 1] - sizeof(intptr_t);
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gprs[kNumberOfCpuRegisters] = rsp;
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*(reinterpret_cast<uintptr_t*>(rsp)) = rip_;
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art_quick_do_long_jump(gprs, fprs);
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#else
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UNIMPLEMENTED(FATAL);
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UNREACHABLE();
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#endif
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}
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} // namespace x86_64
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} // namespace art
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