1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "context_arm.h" 18 19 #include "mirror/art_method.h" 20 #include "mirror/object-inl.h" 21 #include "stack.h" 22 #include "thread.h" 23 24 namespace art { 25 namespace arm { 26 27 static const uint32_t gZero = 0; 28 29 void ArmContext::Reset() { 30 for (size_t i = 0; i < kNumberOfCoreRegisters; i++) { 31 gprs_[i] = NULL; 32 } 33 for (size_t i = 0; i < kNumberOfSRegisters; i++) { 34 fprs_[i] = NULL; 35 } 36 gprs_[SP] = &sp_; 37 gprs_[PC] = &pc_; 38 // Initialize registers with easy to spot debug values. 39 sp_ = ArmContext::kBadGprBase + SP; 40 pc_ = ArmContext::kBadGprBase + PC; 41 } 42 43 void ArmContext::FillCalleeSaves(const StackVisitor& fr) { 44 mirror::ArtMethod* method = fr.GetMethod(); 45 uint32_t core_spills = method->GetCoreSpillMask(); 46 uint32_t fp_core_spills = method->GetFpSpillMask(); 47 size_t spill_count = __builtin_popcount(core_spills); 48 size_t fp_spill_count = __builtin_popcount(fp_core_spills); 49 size_t frame_size = method->GetFrameSizeInBytes(); 50 if (spill_count > 0) { 51 // Lowest number spill is farthest away, walk registers and fill into context 52 int j = 1; 53 for (size_t i = 0; i < kNumberOfCoreRegisters; i++) { 54 if (((core_spills >> i) & 1) != 0) { 55 gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_size); 56 j++; 57 } 58 } 59 } 60 if (fp_spill_count > 0) { 61 // Lowest number spill is farthest away, walk registers and fill into context 62 int j = 1; 63 for (size_t i = 0; i < kNumberOfSRegisters; i++) { 64 if (((fp_core_spills >> i) & 1) != 0) { 65 fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_size); 66 j++; 67 } 68 } 69 } 70 } 71 72 void ArmContext::SetGPR(uint32_t reg, uintptr_t value) { 73 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters)); 74 DCHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset. 75 DCHECK(gprs_[reg] != NULL); 76 *gprs_[reg] = value; 77 } 78 79 void ArmContext::SmashCallerSaves() { 80 // This needs to be 0 because we want a null/zero return value. 81 gprs_[R0] = const_cast<uint32_t*>(&gZero); 82 gprs_[R1] = const_cast<uint32_t*>(&gZero); 83 gprs_[R2] = NULL; 84 gprs_[R3] = NULL; 85 } 86 87 extern "C" void art_quick_do_long_jump(uint32_t*, uint32_t*); 88 89 void ArmContext::DoLongJump() { 90 uintptr_t gprs[16]; 91 uint32_t fprs[32]; 92 for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) { 93 gprs[i] = gprs_[i] != NULL ? *gprs_[i] : ArmContext::kBadGprBase + i; 94 } 95 for (size_t i = 0; i < kNumberOfSRegisters; ++i) { 96 fprs[i] = fprs_[i] != NULL ? *fprs_[i] : ArmContext::kBadGprBase + i; 97 } 98 DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]); 99 art_quick_do_long_jump(gprs, fprs); 100 } 101 102 } // namespace arm 103 } // namespace art 104
