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-inl.h"
20 #include "mirror/object-inl.h"
21 #include "quick/quick_method_frame_info.h"
22 #include "stack.h"
23
24 namespace art {
25 namespace mips {
26
27 static constexpr uint32_t gZero = 0;
28
Reset()29 void MipsContext::Reset() {
30 for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
31 gprs_[i] = nullptr;
32 }
33 for (size_t i = 0; i < kNumberOfFRegisters; i++) {
34 fprs_[i] = nullptr;
35 }
36 gprs_[SP] = &sp_;
37 gprs_[RA] = &ra_;
38 // Initialize registers with easy to spot debug values.
39 sp_ = MipsContext::kBadGprBase + SP;
40 ra_ = MipsContext::kBadGprBase + RA;
41 }
42
FillCalleeSaves(const StackVisitor & fr)43 void MipsContext::FillCalleeSaves(const StackVisitor& fr) {
44 mirror::ArtMethod* method = fr.GetMethod();
45 const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
46 size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
47 size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
48 if (spill_count > 0) {
49 // Lowest number spill is farthest away, walk registers and fill into context.
50 int j = 1;
51 for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
52 if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
53 gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_info.FrameSizeInBytes());
54 j++;
55 }
56 }
57 }
58 if (fp_spill_count > 0) {
59 // Lowest number spill is farthest away, walk registers and fill into context.
60 int j = 1;
61 for (size_t i = 0; i < kNumberOfFRegisters; i++) {
62 if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
63 fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j,
64 frame_info.FrameSizeInBytes());
65 j++;
66 }
67 }
68 }
69 }
70
SetGPR(uint32_t reg,uintptr_t value)71 bool 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 if (gprs_[reg] != nullptr) {
75 *gprs_[reg] = value;
76 return true;
77 } else {
78 return false;
79 }
80 }
81
SetFPR(uint32_t reg,uintptr_t value)82 bool MipsContext::SetFPR(uint32_t reg, uintptr_t value) {
83 CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFRegisters));
84 CHECK_NE(fprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
85 if (fprs_[reg] != nullptr) {
86 *fprs_[reg] = value;
87 return true;
88 } else {
89 return false;
90 }
91 }
92
SmashCallerSaves()93 void MipsContext::SmashCallerSaves() {
94 // This needs to be 0 because we want a null/zero return value.
95 gprs_[V0] = const_cast<uint32_t*>(&gZero);
96 gprs_[V1] = const_cast<uint32_t*>(&gZero);
97 gprs_[A1] = nullptr;
98 gprs_[A2] = nullptr;
99 gprs_[A3] = nullptr;
100 }
101
102 extern "C" void art_quick_do_long_jump(uint32_t*, uint32_t*);
103
DoLongJump()104 void MipsContext::DoLongJump() {
105 uintptr_t gprs[kNumberOfCoreRegisters];
106 uint32_t fprs[kNumberOfFRegisters];
107 for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
108 gprs[i] = gprs_[i] != nullptr ? *gprs_[i] : MipsContext::kBadGprBase + i;
109 }
110 for (size_t i = 0; i < kNumberOfFRegisters; ++i) {
111 fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : MipsContext::kBadGprBase + i;
112 }
113 art_quick_do_long_jump(gprs, fprs);
114 }
115
116 } // namespace mips
117 } // namespace art
118