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_mips.h" 18 19 #include "mirror/art_method.h" 20 #include "mirror/object-inl.h" 21 #include "stack.h" 22 23 namespace art { 24 namespace mips { 25 26 static const uint32_t gZero = 0; 27 28 void MipsContext::Reset() { 29 for (size_t i = 0; i < kNumberOfCoreRegisters; i++) { 30 gprs_[i] = NULL; 31 } 32 for (size_t i = 0; i < kNumberOfFRegisters; i++) { 33 fprs_[i] = NULL; 34 } 35 gprs_[SP] = &sp_; 36 gprs_[RA] = &ra_; 37 // Initialize registers with easy to spot debug values. 38 sp_ = MipsContext::kBadGprBase + SP; 39 ra_ = MipsContext::kBadGprBase + RA; 40 } 41 42 void MipsContext::FillCalleeSaves(const StackVisitor& fr) { 43 mirror::ArtMethod* method = fr.GetMethod(); 44 uint32_t core_spills = method->GetCoreSpillMask(); 45 uint32_t fp_core_spills = method->GetFpSpillMask(); 46 size_t spill_count = __builtin_popcount(core_spills); 47 size_t fp_spill_count = __builtin_popcount(fp_core_spills); 48 size_t frame_size = method->GetFrameSizeInBytes(); 49 if (spill_count > 0) { 50 // Lowest number spill is farthest away, walk registers and fill into context. 51 int j = 1; 52 for (size_t i = 0; i < kNumberOfCoreRegisters; i++) { 53 if (((core_spills >> i) & 1) != 0) { 54 gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_size); 55 j++; 56 } 57 } 58 } 59 if (fp_spill_count > 0) { 60 // Lowest number spill is farthest away, walk registers and fill into context. 61 int j = 1; 62 for (size_t i = 0; i < kNumberOfFRegisters; i++) { 63 if (((fp_core_spills >> i) & 1) != 0) { 64 fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_size); 65 j++; 66 } 67 } 68 } 69 } 70 71 void MipsContext::SetGPR(uint32_t reg, uintptr_t value) { 72 CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters)); 73 CHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset. 74 CHECK(gprs_[reg] != NULL); 75 *gprs_[reg] = value; 76 } 77 78 void MipsContext::SmashCallerSaves() { 79 // This needs to be 0 because we want a null/zero return value. 80 gprs_[V0] = const_cast<uint32_t*>(&gZero); 81 gprs_[V1] = const_cast<uint32_t*>(&gZero); 82 gprs_[A1] = NULL; 83 gprs_[A2] = NULL; 84 gprs_[A3] = NULL; 85 } 86 87 extern "C" void art_quick_do_long_jump(uint32_t*, uint32_t*); 88 89 void MipsContext::DoLongJump() { 90 uintptr_t gprs[kNumberOfCoreRegisters]; 91 uint32_t fprs[kNumberOfFRegisters]; 92 for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) { 93 gprs[i] = gprs_[i] != NULL ? *gprs_[i] : MipsContext::kBadGprBase + i; 94 } 95 for (size_t i = 0; i < kNumberOfFRegisters; ++i) { 96 fprs[i] = fprs_[i] != NULL ? *fprs_[i] : MipsContext::kBadGprBase + i; 97 } 98 art_quick_do_long_jump(gprs, fprs); 99 } 100 101 } // namespace mips 102 } // namespace art 103
