119 lines
3.9 KiB
C++
119 lines
3.9 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_arm.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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#include "thread-current-inl.h"
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namespace art {
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namespace arm {
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static constexpr uint32_t gZero = 0;
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void ArmContext::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_[SP] = &sp_;
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gprs_[PC] = &pc_;
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gprs_[R0] = &arg0_;
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// Initialize registers with easy to spot debug values.
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sp_ = ArmContext::kBadGprBase + SP;
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pc_ = ArmContext::kBadGprBase + PC;
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arg0_ = 0;
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}
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void ArmContext::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 = frame_info.CoreSpillMask();
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DCHECK_EQ(0u, core_regs & (static_cast<uint32_t>(-1) << kNumberOfCoreRegisters));
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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()));
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// FP registers come second, from the highest down to the lowest.
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for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) {
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fprs_[fp_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()) + POPCOUNT(frame_info.FpSpillMask()));
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}
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void ArmContext::SetGPR(uint32_t reg, uintptr_t value) {
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DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
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DCHECK(IsAccessibleGPR(reg));
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DCHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
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*gprs_[reg] = value;
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}
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void ArmContext::SetFPR(uint32_t reg, uintptr_t value) {
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DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
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DCHECK(IsAccessibleFPR(reg));
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DCHECK_NE(fprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
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*fprs_[reg] = value;
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}
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void ArmContext::SmashCallerSaves() {
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// This needs to be 0 because we want a null/zero return value.
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gprs_[R0] = const_cast<uint32_t*>(&gZero);
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gprs_[R1] = const_cast<uint32_t*>(&gZero);
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gprs_[R2] = nullptr;
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gprs_[R3] = nullptr;
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fprs_[S0] = nullptr;
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fprs_[S1] = nullptr;
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fprs_[S2] = nullptr;
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fprs_[S3] = nullptr;
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fprs_[S4] = nullptr;
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fprs_[S5] = nullptr;
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fprs_[S6] = nullptr;
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fprs_[S7] = nullptr;
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fprs_[S8] = nullptr;
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fprs_[S9] = nullptr;
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fprs_[S10] = nullptr;
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fprs_[S11] = nullptr;
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fprs_[S12] = nullptr;
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fprs_[S13] = nullptr;
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fprs_[S14] = nullptr;
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fprs_[S15] = nullptr;
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}
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extern "C" NO_RETURN void art_quick_do_long_jump(uint32_t*, uint32_t*);
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void ArmContext::DoLongJump() {
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uintptr_t gprs[kNumberOfCoreRegisters];
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uint32_t fprs[kNumberOfSRegisters];
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for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
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gprs[i] = gprs_[i] != nullptr ? *gprs_[i] : ArmContext::kBadGprBase + i;
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}
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for (size_t i = 0; i < kNumberOfSRegisters; ++i) {
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fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : ArmContext::kBadFprBase + i;
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}
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// Ensure the Thread Register contains the address of the current thread.
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DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]);
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// The Marking Register will be updated by art_quick_do_long_jump.
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art_quick_do_long_jump(gprs, fprs);
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}
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} // namespace arm
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} // namespace art
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