assembler-mips-inl.h revision 85b71799222b55eb5dd74ea26efe0c64ab655c8c 
1// Copyright (c) 1994-2006 Sun Microsystems Inc.
2// All Rights Reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met:
7//
8// - Redistributions of source code must retain the above copyright notice,
9// this list of conditions and the following disclaimer.
10//
11// - Redistribution in binary form must reproduce the above copyright
12// notice, this list of conditions and the following disclaimer in the
13// documentation and/or other materials provided with the distribution.
14//
15// - Neither the name of Sun Microsystems or the names of contributors may
16// be used to endorse or promote products derived from this software without
17// specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31// The original source code covered by the above license above has been
32// modified significantly by Google Inc.
33// Copyright 2011 the V8 project authors. All rights reserved.
34
35
36#ifndef V8_MIPS_ASSEMBLER_MIPS_INL_H_
37#define V8_MIPS_ASSEMBLER_MIPS_INL_H_
38
39#include "mips/assembler-mips.h"
40#include "cpu.h"
41#include "debug.h"
42
43
44namespace v8 {
45namespace internal {
46
47// -----------------------------------------------------------------------------
48// Operand and MemOperand.
49
50Operand::Operand(int32_t immediate, RelocInfo::Mode rmode)  {
51  rm_ = no_reg;
52  imm32_ = immediate;
53  rmode_ = rmode;
54}
55
56
57Operand::Operand(const ExternalReference& f)  {
58  rm_ = no_reg;
59  imm32_ = reinterpret_cast<int32_t>(f.address());
60  rmode_ = RelocInfo::EXTERNAL_REFERENCE;
61}
62
63
64Operand::Operand(Smi* value) {
65  rm_ = no_reg;
66  imm32_ =  reinterpret_cast<intptr_t>(value);
67  rmode_ = RelocInfo::NONE;
68}
69
70
71Operand::Operand(Register rm) {
72  rm_ = rm;
73}
74
75
76bool Operand::is_reg() const {
77  return rm_.is_valid();
78}
79
80
81
82// -----------------------------------------------------------------------------
83// RelocInfo.
84
85void RelocInfo::apply(intptr_t delta) {
86  if (IsCodeTarget(rmode_)) {
87    uint32_t scope1 = (uint32_t) target_address() & ~kImm28Mask;
88    uint32_t scope2 = reinterpret_cast<uint32_t>(pc_) & ~kImm28Mask;
89
90    if (scope1 != scope2) {
91      Assembler::JumpLabelToJumpRegister(pc_);
92    }
93  }
94  if (IsInternalReference(rmode_)) {
95    // Absolute code pointer inside code object moves with the code object.
96    byte* p = reinterpret_cast<byte*>(pc_);
97    int count = Assembler::RelocateInternalReference(p, delta);
98    CPU::FlushICache(p, count * sizeof(uint32_t));
99  }
100}
101
102
103Address RelocInfo::target_address() {
104  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
105  return Assembler::target_address_at(pc_);
106}
107
108
109Address RelocInfo::target_address_address() {
110  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
111  return reinterpret_cast<Address>(pc_);
112}
113
114
115int RelocInfo::target_address_size() {
116  return Assembler::kExternalTargetSize;
117}
118
119
120void RelocInfo::set_target_address(Address target) {
121  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
122  Assembler::set_target_address_at(pc_, target);
123}
124
125
126Object* RelocInfo::target_object() {
127  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
128  return reinterpret_cast<Object*>(Assembler::target_address_at(pc_));
129}
130
131
132Handle<Object> RelocInfo::target_object_handle(Assembler *origin) {
133  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
134  return Handle<Object>(reinterpret_cast<Object**>(
135      Assembler::target_address_at(pc_)));
136}
137
138
139Object** RelocInfo::target_object_address() {
140  // Provide a "natural pointer" to the embedded object,
141  // which can be de-referenced during heap iteration.
142  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
143  reconstructed_obj_ptr_ =
144      reinterpret_cast<Object*>(Assembler::target_address_at(pc_));
145  return &reconstructed_obj_ptr_;
146}
147
148
149void RelocInfo::set_target_object(Object* target) {
150  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
151  Assembler::set_target_address_at(pc_, reinterpret_cast<Address>(target));
152}
153
154
155Address* RelocInfo::target_reference_address() {
156  ASSERT(rmode_ == EXTERNAL_REFERENCE);
157  reconstructed_adr_ptr_ = Assembler::target_address_at(pc_);
158  return &reconstructed_adr_ptr_;
159}
160
161
162Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() {
163  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
164  Address address = Memory::Address_at(pc_);
165  return Handle<JSGlobalPropertyCell>(
166      reinterpret_cast<JSGlobalPropertyCell**>(address));
167}
168
169
170JSGlobalPropertyCell* RelocInfo::target_cell() {
171  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
172  Address address = Memory::Address_at(pc_);
173  Object* object = HeapObject::FromAddress(
174      address - JSGlobalPropertyCell::kValueOffset);
175  return reinterpret_cast<JSGlobalPropertyCell*>(object);
176}
177
178
179void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell) {
180  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
181  Address address = cell->address() + JSGlobalPropertyCell::kValueOffset;
182  Memory::Address_at(pc_) = address;
183}
184
185
186Address RelocInfo::call_address() {
187  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
188         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
189  // The pc_ offset of 0 assumes mips patched return sequence per
190  // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
191  // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
192  return Assembler::target_address_at(pc_);
193}
194
195
196void RelocInfo::set_call_address(Address target) {
197  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
198         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
199  // The pc_ offset of 0 assumes mips patched return sequence per
200  // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
201  // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
202  Assembler::set_target_address_at(pc_, target);
203}
204
205
206Object* RelocInfo::call_object() {
207  return *call_object_address();
208}
209
210
211Object** RelocInfo::call_object_address() {
212  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
213         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
214  return reinterpret_cast<Object**>(pc_ + 2 * Assembler::kInstrSize);
215}
216
217
218void RelocInfo::set_call_object(Object* target) {
219  *call_object_address() = target;
220}
221
222
223bool RelocInfo::IsPatchedReturnSequence() {
224  Instr instr0 = Assembler::instr_at(pc_);
225  Instr instr1 = Assembler::instr_at(pc_ + 1 * Assembler::kInstrSize);
226  Instr instr2 = Assembler::instr_at(pc_ + 2 * Assembler::kInstrSize);
227  bool patched_return = ((instr0 & kOpcodeMask) == LUI &&
228                         (instr1 & kOpcodeMask) == ORI &&
229                         ((instr2 & kOpcodeMask) == JAL ||
230                          ((instr2 & kOpcodeMask) == SPECIAL &&
231                           (instr2 & kFunctionFieldMask) == JALR)));
232  return patched_return;
233}
234
235
236bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
237  Instr current_instr = Assembler::instr_at(pc_);
238  return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
239}
240
241
242void RelocInfo::Visit(ObjectVisitor* visitor) {
243  RelocInfo::Mode mode = rmode();
244  if (mode == RelocInfo::EMBEDDED_OBJECT) {
245    Object** p = target_object_address();
246    Object* orig = *p;
247    visitor->VisitPointer(p);
248    if (*p != orig) {
249      set_target_object(*p);
250    }
251  } else if (RelocInfo::IsCodeTarget(mode)) {
252    visitor->VisitCodeTarget(this);
253  } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
254    visitor->VisitGlobalPropertyCell(this);
255  } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
256    visitor->VisitExternalReference(target_reference_address());
257#ifdef ENABLE_DEBUGGER_SUPPORT
258  // TODO(isolates): Get a cached isolate below.
259  } else if (((RelocInfo::IsJSReturn(mode) &&
260               IsPatchedReturnSequence()) ||
261              (RelocInfo::IsDebugBreakSlot(mode) &&
262               IsPatchedDebugBreakSlotSequence())) &&
263             Isolate::Current()->debug()->has_break_points()) {
264    visitor->VisitDebugTarget(this);
265#endif
266  } else if (mode == RelocInfo::RUNTIME_ENTRY) {
267    visitor->VisitRuntimeEntry(this);
268  }
269}
270
271
272template<typename StaticVisitor>
273void RelocInfo::Visit(Heap* heap) {
274  RelocInfo::Mode mode = rmode();
275  if (mode == RelocInfo::EMBEDDED_OBJECT) {
276    StaticVisitor::VisitPointer(heap, target_object_address());
277  } else if (RelocInfo::IsCodeTarget(mode)) {
278    StaticVisitor::VisitCodeTarget(heap, this);
279  } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
280    StaticVisitor::VisitGlobalPropertyCell(heap, this);
281  } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
282    StaticVisitor::VisitExternalReference(target_reference_address());
283#ifdef ENABLE_DEBUGGER_SUPPORT
284  } else if (heap->isolate()->debug()->has_break_points() &&
285             ((RelocInfo::IsJSReturn(mode) &&
286              IsPatchedReturnSequence()) ||
287             (RelocInfo::IsDebugBreakSlot(mode) &&
288              IsPatchedDebugBreakSlotSequence()))) {
289    StaticVisitor::VisitDebugTarget(heap, this);
290#endif
291  } else if (mode == RelocInfo::RUNTIME_ENTRY) {
292    StaticVisitor::VisitRuntimeEntry(this);
293  }
294}
295
296
297// -----------------------------------------------------------------------------
298// Assembler.
299
300
301void Assembler::CheckBuffer() {
302  if (buffer_space() <= kGap) {
303    GrowBuffer();
304  }
305}
306
307
308void Assembler::CheckTrampolinePoolQuick() {
309  if (pc_offset() >= next_buffer_check_) {
310    CheckTrampolinePool();
311  }
312}
313
314
315void Assembler::emit(Instr x) {
316  if (!is_buffer_growth_blocked()) {
317    CheckBuffer();
318  }
319  *reinterpret_cast<Instr*>(pc_) = x;
320  pc_ += kInstrSize;
321  CheckTrampolinePoolQuick();
322}
323
324
325} }  // namespace v8::internal
326
327#endif  // V8_MIPS_ASSEMBLER_MIPS_INL_H_
328