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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 int32_t encoded = Assembler::EncodeBranchOffset(bound_pc - position, next); | |
33 buffer_.Store<int32_t>(position, encoded); | |
34 label->position_ = Assembler::DecodeBranchOffset(next); | |
35 } | |
36 label->BindTo(bound_pc); | |
37 } | |
38 | |
39 | |
40 int32_t Assembler::EncodeBranchOffset(int32_t offset, int32_t inst) { | |
regis
2013/03/22 19:51:16
inst -> instr
zra
2013/03/22 20:16:01
Done.
| |
41 ASSERT(Utils::IsAligned(offset, 4)); | |
42 ASSERT(Utils::IsInt(16, offset)); | |
regis
2013/03/22 19:51:16
Not 16, but 18.
zra
2013/03/22 20:16:01
Done.
| |
43 | |
44 // Properly preserve only the bits supported in the instruction. | |
45 offset >>= 2; | |
46 offset &= kBranchOffsetMask; | |
47 return (inst & ~kBranchOffsetMask) | offset; | |
48 } | |
49 | |
50 | |
51 int Assembler::DecodeBranchOffset(int32_t inst) { | |
regis
2013/03/22 19:51:16
Do you use this call while assembling instructions
zra
2013/03/22 20:16:01
It's used in Bind above. This also mirrors the ARM
| |
52 // Sign-extend, left-shift by 2. | |
53 return (((inst & kBranchOffsetMask) << 16) >> 14); | |
54 } | |
55 | |
25 } // namespace dart | 56 } // namespace dart |
26 | 57 |
27 #endif // defined TARGET_ARCH_MIPS | 58 #endif // defined TARGET_ARCH_MIPS |
28 | 59 |
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