Elliott Hughes | 2faa5f1 | 2012-01-30 14:42:07 -0800 | [diff] [blame] | 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 | */ |
Ian Rogers | bdb0391 | 2011-09-14 00:55:44 -0700 | [diff] [blame] | 16 | |
| 17 | #include "context_arm.h" |
| 18 | |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 19 | #include "base/bit_utils.h" |
Andreas Gampe | 5678db5 | 2017-06-08 14:11:18 -0700 | [diff] [blame] | 20 | #include "base/bit_utils_iterator.h" |
Vladimir Marko | 7624d25 | 2014-05-02 14:40:15 +0100 | [diff] [blame] | 21 | #include "quick/quick_method_frame_info.h" |
Andreas Gampe | b486a98 | 2017-06-01 13:45:54 -0700 | [diff] [blame] | 22 | #include "thread-current-inl.h" |
Ian Rogers | bdb0391 | 2011-09-14 00:55:44 -0700 | [diff] [blame] | 23 | |
| 24 | namespace art { |
| 25 | namespace arm { |
| 26 | |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 27 | static constexpr uint32_t gZero = 0; |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 28 | |
| 29 | void ArmContext::Reset() { |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 30 | std::fill_n(gprs_, arraysize(gprs_), nullptr); |
| 31 | std::fill_n(fprs_, arraysize(fprs_), nullptr); |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 32 | gprs_[SP] = &sp_; |
| 33 | gprs_[PC] = &pc_; |
Andreas Gampe | 639bdd1 | 2015-06-03 11:22:45 -0700 | [diff] [blame] | 34 | gprs_[R0] = &arg0_; |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 35 | // Initialize registers with easy to spot debug values. |
| 36 | sp_ = ArmContext::kBadGprBase + SP; |
| 37 | pc_ = ArmContext::kBadGprBase + PC; |
Andreas Gampe | 639bdd1 | 2015-06-03 11:22:45 -0700 | [diff] [blame] | 38 | arg0_ = 0; |
Ian Rogers | bdb0391 | 2011-09-14 00:55:44 -0700 | [diff] [blame] | 39 | } |
| 40 | |
Nicolas Geoffray | 524e7ea | 2015-10-16 17:13:34 +0100 | [diff] [blame] | 41 | void ArmContext::FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& frame_info) { |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 42 | int spill_pos = 0; |
| 43 | |
| 44 | // Core registers come first, from the highest down to the lowest. |
| 45 | uint32_t core_regs = frame_info.CoreSpillMask(); |
| 46 | DCHECK_EQ(0u, core_regs & (static_cast<uint32_t>(-1) << kNumberOfCoreRegisters)); |
| 47 | for (uint32_t core_reg : HighToLowBits(core_regs)) { |
Nicolas Geoffray | 524e7ea | 2015-10-16 17:13:34 +0100 | [diff] [blame] | 48 | gprs_[core_reg] = CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes()); |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 49 | ++spill_pos; |
Ian Rogers | bdb0391 | 2011-09-14 00:55:44 -0700 | [diff] [blame] | 50 | } |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 51 | DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask())); |
| 52 | |
| 53 | // FP registers come second, from the highest down to the lowest. |
| 54 | for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) { |
Nicolas Geoffray | 524e7ea | 2015-10-16 17:13:34 +0100 | [diff] [blame] | 55 | fprs_[fp_reg] = CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes()); |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 56 | ++spill_pos; |
Ian Rogers | 15fdb8c | 2011-09-25 15:45:07 -0700 | [diff] [blame] | 57 | } |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 58 | DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) + POPCOUNT(frame_info.FpSpillMask())); |
Ian Rogers | bdb0391 | 2011-09-14 00:55:44 -0700 | [diff] [blame] | 59 | } |
| 60 | |
Sebastien Hertz | 96ba8dc | 2015-01-22 18:57:14 +0100 | [diff] [blame] | 61 | void ArmContext::SetGPR(uint32_t reg, uintptr_t value) { |
Brian Carlstrom | d74e41b | 2013-03-24 23:47:01 -0700 | [diff] [blame] | 62 | DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters)); |
Sebastien Hertz | 96ba8dc | 2015-01-22 18:57:14 +0100 | [diff] [blame] | 63 | DCHECK(IsAccessibleGPR(reg)); |
Brian Carlstrom | 7934ac2 | 2013-07-26 10:54:15 -0700 | [diff] [blame] | 64 | DCHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset. |
Sebastien Hertz | 96ba8dc | 2015-01-22 18:57:14 +0100 | [diff] [blame] | 65 | *gprs_[reg] = value; |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 66 | } |
| 67 | |
Sebastien Hertz | 96ba8dc | 2015-01-22 18:57:14 +0100 | [diff] [blame] | 68 | void ArmContext::SetFPR(uint32_t reg, uintptr_t value) { |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 69 | DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters)); |
Sebastien Hertz | 96ba8dc | 2015-01-22 18:57:14 +0100 | [diff] [blame] | 70 | DCHECK(IsAccessibleFPR(reg)); |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 71 | DCHECK_NE(fprs_[reg], &gZero); // Can't overwrite this static value since they are never reset. |
Sebastien Hertz | 96ba8dc | 2015-01-22 18:57:14 +0100 | [diff] [blame] | 72 | *fprs_[reg] = value; |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 73 | } |
| 74 | |
Elliott Hughes | 9c750f9 | 2012-04-05 12:07:59 -0700 | [diff] [blame] | 75 | void ArmContext::SmashCallerSaves() { |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 76 | // This needs to be 0 because we want a null/zero return value. |
| 77 | gprs_[R0] = const_cast<uint32_t*>(&gZero); |
| 78 | gprs_[R1] = const_cast<uint32_t*>(&gZero); |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 79 | gprs_[R2] = nullptr; |
| 80 | gprs_[R3] = nullptr; |
Zheng Xu | 5667fdb | 2014-10-23 18:29:55 +0800 | [diff] [blame] | 81 | |
| 82 | fprs_[S0] = nullptr; |
| 83 | fprs_[S1] = nullptr; |
| 84 | fprs_[S2] = nullptr; |
| 85 | fprs_[S3] = nullptr; |
| 86 | fprs_[S4] = nullptr; |
| 87 | fprs_[S5] = nullptr; |
| 88 | fprs_[S6] = nullptr; |
| 89 | fprs_[S7] = nullptr; |
| 90 | fprs_[S8] = nullptr; |
| 91 | fprs_[S9] = nullptr; |
| 92 | fprs_[S10] = nullptr; |
| 93 | fprs_[S11] = nullptr; |
| 94 | fprs_[S12] = nullptr; |
| 95 | fprs_[S13] = nullptr; |
| 96 | fprs_[S14] = nullptr; |
| 97 | fprs_[S15] = nullptr; |
Elliott Hughes | 9c750f9 | 2012-04-05 12:07:59 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Andreas Gampe | 794ad76 | 2015-02-23 08:12:24 -0800 | [diff] [blame] | 100 | extern "C" NO_RETURN void art_quick_do_long_jump(uint32_t*, uint32_t*); |
Ian Rogers | 57b86d4 | 2012-03-27 16:05:41 -0700 | [diff] [blame] | 101 | |
Ian Rogers | bdb0391 | 2011-09-14 00:55:44 -0700 | [diff] [blame] | 102 | void ArmContext::DoLongJump() { |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 103 | uintptr_t gprs[kNumberOfCoreRegisters]; |
| 104 | uint32_t fprs[kNumberOfSRegisters]; |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 105 | for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) { |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 106 | gprs[i] = gprs_[i] != nullptr ? *gprs_[i] : ArmContext::kBadGprBase + i; |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 107 | } |
| 108 | for (size_t i = 0; i < kNumberOfSRegisters; ++i) { |
Sebastien Hertz | 0bcb290 | 2014-06-17 15:52:45 +0200 | [diff] [blame] | 109 | fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : ArmContext::kBadFprBase + i; |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 110 | } |
Roland Levillain | 6d729a7 | 2017-06-30 18:34:01 +0100 | [diff] [blame] | 111 | // Ensure the Thread Register contains the address of the current thread. |
Mathieu Chartier | 6702243 | 2012-11-29 18:04:50 -0800 | [diff] [blame] | 112 | DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]); |
Roland Levillain | 6d729a7 | 2017-06-30 18:34:01 +0100 | [diff] [blame] | 113 | // The Marking Register will be updated by art_quick_do_long_jump. |
Logan Chien | 8dbb708 | 2013-01-25 20:31:17 +0800 | [diff] [blame] | 114 | art_quick_do_long_jump(gprs, fprs); |
Ian Rogers | bdb0391 | 2011-09-14 00:55:44 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | } // namespace arm |
| 118 | } // namespace art |