assembler-ia32-inl.h revision 1e0659c275bb392c045087af4f6b0d7565cb3d77 
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
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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 2006-2008 the V8 project authors. All rights reserved.
34
35// A light-weight IA32 Assembler.
36
37#ifndef V8_IA32_ASSEMBLER_IA32_INL_H_
38#define V8_IA32_ASSEMBLER_IA32_INL_H_
39
40#include "cpu.h"
41#include "debug.h"
42
43namespace v8 {
44namespace internal {
45
46
47// The modes possibly affected by apply must be in kApplyMask.
48void RelocInfo::apply(intptr_t delta) {
49  if (rmode_ == RUNTIME_ENTRY || IsCodeTarget(rmode_)) {
50    int32_t* p = reinterpret_cast<int32_t*>(pc_);
51    *p -= delta;  // Relocate entry.
52    CPU::FlushICache(p, sizeof(uint32_t));
53  } else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) {
54    // Special handling of js_return when a break point is set (call
55    // instruction has been inserted).
56    int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
57    *p -= delta;  // Relocate entry.
58    CPU::FlushICache(p, sizeof(uint32_t));
59  } else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) {
60    // Special handling of a debug break slot when a break point is set (call
61    // instruction has been inserted).
62    int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
63    *p -= delta;  // Relocate entry.
64    CPU::FlushICache(p, sizeof(uint32_t));
65  } else if (IsInternalReference(rmode_)) {
66    // absolute code pointer inside code object moves with the code object.
67    int32_t* p = reinterpret_cast<int32_t*>(pc_);
68    *p += delta;  // Relocate entry.
69    CPU::FlushICache(p, sizeof(uint32_t));
70  }
71}
72
73
74Address RelocInfo::target_address() {
75  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
76  return Assembler::target_address_at(pc_);
77}
78
79
80Address RelocInfo::target_address_address() {
81  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
82  return reinterpret_cast<Address>(pc_);
83}
84
85
86int RelocInfo::target_address_size() {
87  return Assembler::kExternalTargetSize;
88}
89
90
91void RelocInfo::set_target_address(Address target) {
92  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
93  Assembler::set_target_address_at(pc_, target);
94}
95
96
97Object* RelocInfo::target_object() {
98  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
99  return Memory::Object_at(pc_);
100}
101
102
103Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
104  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
105  return Memory::Object_Handle_at(pc_);
106}
107
108
109Object** RelocInfo::target_object_address() {
110  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
111  return &Memory::Object_at(pc_);
112}
113
114
115void RelocInfo::set_target_object(Object* target) {
116  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
117  Memory::Object_at(pc_) = target;
118  CPU::FlushICache(pc_, sizeof(Address));
119}
120
121
122Address* RelocInfo::target_reference_address() {
123  ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
124  return reinterpret_cast<Address*>(pc_);
125}
126
127
128Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() {
129  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
130  Address address = Memory::Address_at(pc_);
131  return Handle<JSGlobalPropertyCell>(
132      reinterpret_cast<JSGlobalPropertyCell**>(address));
133}
134
135
136JSGlobalPropertyCell* RelocInfo::target_cell() {
137  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
138  Address address = Memory::Address_at(pc_);
139  Object* object = HeapObject::FromAddress(
140      address - JSGlobalPropertyCell::kValueOffset);
141  return reinterpret_cast<JSGlobalPropertyCell*>(object);
142}
143
144
145void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell) {
146  ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
147  Address address = cell->address() + JSGlobalPropertyCell::kValueOffset;
148  Memory::Address_at(pc_) = address;
149  CPU::FlushICache(pc_, sizeof(Address));
150}
151
152
153Address RelocInfo::call_address() {
154  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
155         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
156  return Assembler::target_address_at(pc_ + 1);
157}
158
159
160void RelocInfo::set_call_address(Address target) {
161  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
162         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
163  Assembler::set_target_address_at(pc_ + 1, target);
164}
165
166
167Object* RelocInfo::call_object() {
168  return *call_object_address();
169}
170
171
172void RelocInfo::set_call_object(Object* target) {
173  *call_object_address() = target;
174}
175
176
177Object** RelocInfo::call_object_address() {
178  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
179         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
180  return reinterpret_cast<Object**>(pc_ + 1);
181}
182
183
184bool RelocInfo::IsPatchedReturnSequence() {
185  return *pc_ == 0xE8;
186}
187
188
189bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
190  return !Assembler::IsNop(pc());
191}
192
193
194void RelocInfo::Visit(ObjectVisitor* visitor) {
195  RelocInfo::Mode mode = rmode();
196  if (mode == RelocInfo::EMBEDDED_OBJECT) {
197    visitor->VisitPointer(target_object_address());
198    CPU::FlushICache(pc_, sizeof(Address));
199  } else if (RelocInfo::IsCodeTarget(mode)) {
200    visitor->VisitCodeTarget(this);
201  } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
202    visitor->VisitGlobalPropertyCell(this);
203  } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
204    visitor->VisitExternalReference(target_reference_address());
205    CPU::FlushICache(pc_, sizeof(Address));
206#ifdef ENABLE_DEBUGGER_SUPPORT
207  } else if (Debug::has_break_points() &&
208             ((RelocInfo::IsJSReturn(mode) &&
209              IsPatchedReturnSequence()) ||
210             (RelocInfo::IsDebugBreakSlot(mode) &&
211              IsPatchedDebugBreakSlotSequence()))) {
212    visitor->VisitDebugTarget(this);
213#endif
214  } else if (mode == RelocInfo::RUNTIME_ENTRY) {
215    visitor->VisitRuntimeEntry(this);
216  }
217}
218
219
220template<typename StaticVisitor>
221void RelocInfo::Visit() {
222  RelocInfo::Mode mode = rmode();
223  if (mode == RelocInfo::EMBEDDED_OBJECT) {
224    StaticVisitor::VisitPointer(target_object_address());
225    CPU::FlushICache(pc_, sizeof(Address));
226  } else if (RelocInfo::IsCodeTarget(mode)) {
227    StaticVisitor::VisitCodeTarget(this);
228  } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
229    StaticVisitor::VisitGlobalPropertyCell(this);
230  } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
231    StaticVisitor::VisitExternalReference(target_reference_address());
232    CPU::FlushICache(pc_, sizeof(Address));
233#ifdef ENABLE_DEBUGGER_SUPPORT
234  } else if (Debug::has_break_points() &&
235             ((RelocInfo::IsJSReturn(mode) &&
236              IsPatchedReturnSequence()) ||
237             (RelocInfo::IsDebugBreakSlot(mode) &&
238              IsPatchedDebugBreakSlotSequence()))) {
239    StaticVisitor::VisitDebugTarget(this);
240#endif
241  } else if (mode == RelocInfo::RUNTIME_ENTRY) {
242    StaticVisitor::VisitRuntimeEntry(this);
243  }
244}
245
246
247
248Immediate::Immediate(int x)  {
249  x_ = x;
250  rmode_ = RelocInfo::NONE;
251}
252
253
254Immediate::Immediate(const ExternalReference& ext) {
255  x_ = reinterpret_cast<int32_t>(ext.address());
256  rmode_ = RelocInfo::EXTERNAL_REFERENCE;
257}
258
259
260Immediate::Immediate(Label* internal_offset) {
261  x_ = reinterpret_cast<int32_t>(internal_offset);
262  rmode_ = RelocInfo::INTERNAL_REFERENCE;
263}
264
265
266Immediate::Immediate(Handle<Object> handle) {
267  // Verify all Objects referred by code are NOT in new space.
268  Object* obj = *handle;
269  ASSERT(!Heap::InNewSpace(obj));
270  if (obj->IsHeapObject()) {
271    x_ = reinterpret_cast<intptr_t>(handle.location());
272    rmode_ = RelocInfo::EMBEDDED_OBJECT;
273  } else {
274    // no relocation needed
275    x_ =  reinterpret_cast<intptr_t>(obj);
276    rmode_ = RelocInfo::NONE;
277  }
278}
279
280
281Immediate::Immediate(Smi* value) {
282  x_ = reinterpret_cast<intptr_t>(value);
283  rmode_ = RelocInfo::NONE;
284}
285
286
287Immediate::Immediate(Address addr) {
288  x_ = reinterpret_cast<int32_t>(addr);
289  rmode_ = RelocInfo::NONE;
290}
291
292
293void Assembler::emit(uint32_t x) {
294  *reinterpret_cast<uint32_t*>(pc_) = x;
295  pc_ += sizeof(uint32_t);
296}
297
298
299void Assembler::emit(Handle<Object> handle) {
300  // Verify all Objects referred by code are NOT in new space.
301  Object* obj = *handle;
302  ASSERT(!Heap::InNewSpace(obj));
303  if (obj->IsHeapObject()) {
304    emit(reinterpret_cast<intptr_t>(handle.location()),
305         RelocInfo::EMBEDDED_OBJECT);
306  } else {
307    // no relocation needed
308    emit(reinterpret_cast<intptr_t>(obj));
309  }
310}
311
312
313void Assembler::emit(uint32_t x, RelocInfo::Mode rmode) {
314  if (rmode != RelocInfo::NONE) RecordRelocInfo(rmode);
315  emit(x);
316}
317
318
319void Assembler::emit(const Immediate& x) {
320  if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
321    Label* label = reinterpret_cast<Label*>(x.x_);
322    emit_code_relative_offset(label);
323    return;
324  }
325  if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_);
326  emit(x.x_);
327}
328
329
330void Assembler::emit_code_relative_offset(Label* label) {
331  if (label->is_bound()) {
332    int32_t pos;
333    pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;
334    emit(pos);
335  } else {
336    emit_disp(label, Displacement::CODE_RELATIVE);
337  }
338}
339
340
341void Assembler::emit_w(const Immediate& x) {
342  ASSERT(x.rmode_ == RelocInfo::NONE);
343  uint16_t value = static_cast<uint16_t>(x.x_);
344  reinterpret_cast<uint16_t*>(pc_)[0] = value;
345  pc_ += sizeof(uint16_t);
346}
347
348
349Address Assembler::target_address_at(Address pc) {
350  return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc);
351}
352
353
354void Assembler::set_target_address_at(Address pc, Address target) {
355  int32_t* p = reinterpret_cast<int32_t*>(pc);
356  *p = target - (pc + sizeof(int32_t));
357  CPU::FlushICache(p, sizeof(int32_t));
358}
359
360
361Displacement Assembler::disp_at(Label* L) {
362  return Displacement(long_at(L->pos()));
363}
364
365
366void Assembler::disp_at_put(Label* L, Displacement disp) {
367  long_at_put(L->pos(), disp.data());
368}
369
370
371void Assembler::emit_disp(Label* L, Displacement::Type type) {
372  Displacement disp(L, type);
373  L->link_to(pc_offset());
374  emit(static_cast<int>(disp.data()));
375}
376
377
378void Operand::set_modrm(int mod, Register rm) {
379  ASSERT((mod & -4) == 0);
380  buf_[0] = mod << 6 | rm.code();
381  len_ = 1;
382}
383
384
385void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
386  ASSERT(len_ == 1);
387  ASSERT((scale & -4) == 0);
388  // Use SIB with no index register only for base esp.
389  ASSERT(!index.is(esp) || base.is(esp));
390  buf_[1] = scale << 6 | index.code() << 3 | base.code();
391  len_ = 2;
392}
393
394
395void Operand::set_disp8(int8_t disp) {
396  ASSERT(len_ == 1 || len_ == 2);
397  *reinterpret_cast<int8_t*>(&buf_[len_++]) = disp;
398}
399
400
401void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {
402  ASSERT(len_ == 1 || len_ == 2);
403  int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
404  *p = disp;
405  len_ += sizeof(int32_t);
406  rmode_ = rmode;
407}
408
409Operand::Operand(Register reg) {
410  // reg
411  set_modrm(3, reg);
412}
413
414
415Operand::Operand(XMMRegister xmm_reg) {
416  Register reg = { xmm_reg.code() };
417  set_modrm(3, reg);
418}
419
420
421Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
422  // [disp/r]
423  set_modrm(0, ebp);
424  set_dispr(disp, rmode);
425}
426
427} }  // namespace v8::internal
428
429#endif  // V8_IA32_ASSEMBLER_IA32_INL_H_
430