| /* |
| * Copyright (C) 2011 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 "context_x86_64.h" |
| |
| #include "mirror/art_method.h" |
| #include "mirror/object-inl.h" |
| #include "stack.h" |
| |
| namespace art { |
| namespace x86_64 { |
| |
| static const uintptr_t gZero = 0; |
| |
| void X86_64Context::Reset() { |
| for (size_t i = 0; i < kNumberOfCpuRegisters; i++) { |
| gprs_[i] = NULL; |
| } |
| gprs_[RSP] = &rsp_; |
| // Initialize registers with easy to spot debug values. |
| rsp_ = X86_64Context::kBadGprBase + RSP; |
| rip_ = X86_64Context::kBadGprBase + kNumberOfCpuRegisters; |
| } |
| |
| void X86_64Context::FillCalleeSaves(const StackVisitor& fr) { |
| mirror::ArtMethod* method = fr.GetMethod(); |
| uint32_t core_spills = method->GetCoreSpillMask(); |
| size_t spill_count = __builtin_popcount(core_spills); |
| DCHECK_EQ(method->GetFpSpillMask(), 0u); |
| size_t frame_size = method->GetFrameSizeInBytes(); |
| if (spill_count > 0) { |
| // Lowest number spill is farthest away, walk registers and fill into context. |
| int j = 2; // Offset j to skip return address spill. |
| for (int i = 0; i < kNumberOfCpuRegisters; i++) { |
| if (((core_spills >> i) & 1) != 0) { |
| gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_size); |
| j++; |
| } |
| } |
| } |
| } |
| |
| void X86_64Context::SmashCallerSaves() { |
| // This needs to be 0 because we want a null/zero return value. |
| gprs_[RAX] = const_cast<uintptr_t*>(&gZero); |
| gprs_[RDX] = const_cast<uintptr_t*>(&gZero); |
| gprs_[RCX] = nullptr; |
| gprs_[RBX] = nullptr; |
| } |
| |
| void X86_64Context::SetGPR(uint32_t reg, uintptr_t value) { |
| CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters)); |
| CHECK_NE(gprs_[reg], &gZero); |
| CHECK(gprs_[reg] != NULL); |
| *gprs_[reg] = value; |
| } |
| |
| void X86_64Context::DoLongJump() { |
| UNIMPLEMENTED(FATAL); |
| } |
| |
| } // namespace x86_64 |
| } // namespace art |