| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdint.h> |
| |
| #include "context_arm64.h" |
| |
| #include "art_method-inl.h" |
| #include "base/bit_utils.h" |
| #include "quick/quick_method_frame_info.h" |
| |
| namespace art { |
| namespace arm64 { |
| |
| static constexpr uint64_t gZero = 0; |
| |
| void Arm64Context::Reset() { |
| std::fill_n(gprs_, arraysize(gprs_), nullptr); |
| std::fill_n(fprs_, arraysize(fprs_), nullptr); |
| gprs_[SP] = &sp_; |
| gprs_[kPC] = &pc_; |
| gprs_[X0] = &arg0_; |
| // Initialize registers with easy to spot debug values. |
| sp_ = Arm64Context::kBadGprBase + SP; |
| pc_ = Arm64Context::kBadGprBase + kPC; |
| arg0_ = 0; |
| } |
| |
| void Arm64Context::FillCalleeSaves(const StackVisitor& fr) { |
| ArtMethod* method = fr.GetMethod(); |
| const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo(); |
| int spill_pos = 0; |
| |
| // Core registers come first, from the highest down to the lowest. |
| for (uint32_t core_reg : HighToLowBits(frame_info.CoreSpillMask())) { |
| gprs_[core_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes()); |
| ++spill_pos; |
| } |
| DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask())); |
| |
| // FP registers come second, from the highest down to the lowest. |
| for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) { |
| fprs_[fp_reg] = fr.CalleeSaveAddress(spill_pos, frame_info.FrameSizeInBytes()); |
| ++spill_pos; |
| } |
| DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) + POPCOUNT(frame_info.FpSpillMask())); |
| } |
| |
| void Arm64Context::SetGPR(uint32_t reg, uintptr_t value) { |
| DCHECK_LT(reg, arraysize(gprs_)); |
| // Note: we use kPC == XZR, so do not ensure that reg != XZR. |
| DCHECK(IsAccessibleGPR(reg)); |
| DCHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset. |
| *gprs_[reg] = value; |
| } |
| |
| void Arm64Context::SetFPR(uint32_t reg, uintptr_t value) { |
| DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters)); |
| DCHECK(IsAccessibleFPR(reg)); |
| DCHECK_NE(fprs_[reg], &gZero); // Can't overwrite this static value since they are never reset. |
| *fprs_[reg] = value; |
| } |
| |
| void Arm64Context::SmashCallerSaves() { |
| // This needs to be 0 because we want a null/zero return value. |
| gprs_[X0] = const_cast<uint64_t*>(&gZero); |
| gprs_[X1] = nullptr; |
| gprs_[X2] = nullptr; |
| gprs_[X3] = nullptr; |
| gprs_[X4] = nullptr; |
| gprs_[X5] = nullptr; |
| gprs_[X6] = nullptr; |
| gprs_[X7] = nullptr; |
| gprs_[X8] = nullptr; |
| gprs_[X9] = nullptr; |
| gprs_[X10] = nullptr; |
| gprs_[X11] = nullptr; |
| gprs_[X12] = nullptr; |
| gprs_[X13] = nullptr; |
| gprs_[X14] = nullptr; |
| gprs_[X15] = nullptr; |
| gprs_[X18] = nullptr; |
| |
| // d0-d7, d16-d31 are caller-saved; d8-d15 are callee-saved. |
| |
| fprs_[D0] = nullptr; |
| fprs_[D1] = nullptr; |
| fprs_[D2] = nullptr; |
| fprs_[D3] = nullptr; |
| fprs_[D4] = nullptr; |
| fprs_[D5] = nullptr; |
| fprs_[D6] = nullptr; |
| fprs_[D7] = nullptr; |
| |
| fprs_[D16] = nullptr; |
| fprs_[D17] = nullptr; |
| fprs_[D18] = nullptr; |
| fprs_[D19] = nullptr; |
| fprs_[D20] = nullptr; |
| fprs_[D21] = nullptr; |
| fprs_[D22] = nullptr; |
| fprs_[D23] = nullptr; |
| fprs_[D24] = nullptr; |
| fprs_[D25] = nullptr; |
| fprs_[D26] = nullptr; |
| fprs_[D27] = nullptr; |
| fprs_[D28] = nullptr; |
| fprs_[D29] = nullptr; |
| fprs_[D30] = nullptr; |
| fprs_[D31] = nullptr; |
| } |
| |
| extern "C" NO_RETURN void art_quick_do_long_jump(uint64_t*, uint64_t*); |
| |
| void Arm64Context::DoLongJump() { |
| uint64_t gprs[arraysize(gprs_)]; |
| uint64_t fprs[kNumberOfDRegisters]; |
| |
| // The long jump routine called below expects to find the value for SP at index 31. |
| DCHECK_EQ(SP, 31); |
| |
| for (size_t i = 0; i < arraysize(gprs_); ++i) { |
| gprs[i] = gprs_[i] != nullptr ? *gprs_[i] : Arm64Context::kBadGprBase + i; |
| } |
| for (size_t i = 0; i < kNumberOfDRegisters; ++i) { |
| fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : Arm64Context::kBadFprBase + i; |
| } |
| DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]); |
| art_quick_do_long_jump(gprs, fprs); |
| } |
| |
| } // namespace arm64 |
| } // namespace art |