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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #include "vm/globals.h" | 5 #include "vm/globals.h" |
6 #if defined(TARGET_ARCH_MIPS) | 6 #if defined(TARGET_ARCH_MIPS) |
7 | 7 |
8 #include "vm/assembler.h" | 8 #include "vm/assembler.h" |
9 | 9 |
10 namespace dart { | 10 namespace dart { |
11 | 11 |
12 DEFINE_FLAG(bool, print_stop_message, true, "Print stop message."); | 12 DEFINE_FLAG(bool, print_stop_message, true, "Print stop message."); |
13 | 13 |
14 | 14 |
15 void Assembler::InitializeMemoryWithBreakpoints(uword data, int length) { | 15 void Assembler::InitializeMemoryWithBreakpoints(uword data, int length) { |
16 ASSERT(Utils::IsAligned(data, 4)); | 16 ASSERT(Utils::IsAligned(data, 4)); |
17 ASSERT(Utils::IsAligned(length, 4)); | 17 ASSERT(Utils::IsAligned(length, 4)); |
18 const uword end = data + length; | 18 const uword end = data + length; |
19 while (data < end) { | 19 while (data < end) { |
20 *reinterpret_cast<int32_t*>(data) = Instr::kBreakPointInstruction; | 20 *reinterpret_cast<int32_t*>(data) = Instr::kBreakPointInstruction; |
21 data += 4; | 21 data += 4; |
22 } | 22 } |
23 } | 23 } |
24 | 24 |
| 25 |
| 26 void Assembler::Bind(Label* label) { |
| 27 ASSERT(!label->IsBound()); |
| 28 int bound_pc = buffer_.Size(); |
| 29 while (label->IsLinked()) { |
| 30 int32_t position = label->Position(); |
| 31 int32_t next = buffer_.Load<int32_t>(position); |
| 32 // Reletive destination from an instruction after the branch. |
| 33 int32_t dest = bound_pc - (position + Instr::kInstrSize); |
| 34 int32_t encoded = Assembler::EncodeBranchOffset(dest, next); |
| 35 buffer_.Store<int32_t>(position, encoded); |
| 36 label->position_ = Assembler::DecodeBranchOffset(next); |
| 37 } |
| 38 label->BindTo(bound_pc); |
| 39 delay_slot_available_ = false; |
| 40 } |
| 41 |
| 42 |
| 43 int32_t Assembler::EncodeBranchOffset(int32_t offset, int32_t instr) { |
| 44 ASSERT(Utils::IsAligned(offset, 4)); |
| 45 ASSERT(Utils::IsInt(18, offset)); |
| 46 |
| 47 // Properly preserve only the bits supported in the instruction. |
| 48 offset >>= 2; |
| 49 offset &= kBranchOffsetMask; |
| 50 return (instr & ~kBranchOffsetMask) | offset; |
| 51 } |
| 52 |
| 53 |
| 54 int Assembler::DecodeBranchOffset(int32_t instr) { |
| 55 // Sign-extend, left-shift by 2. |
| 56 return (((instr & kBranchOffsetMask) << 16) >> 14); |
| 57 } |
| 58 |
25 } // namespace dart | 59 } // namespace dart |
26 | 60 |
27 #endif // defined TARGET_ARCH_MIPS | 61 #endif // defined TARGET_ARCH_MIPS |
28 | 62 |
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