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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 2006-2008 the V8 project authors. All rights reserved. | |
34 | |
35 // A light-weight IA32 Assembler. | |
36 | |
37 #ifndef V8_ASSEMBLER_IA32_INL_H_ | |
38 #define V8_ASSEMBLER_IA32_INL_H_ | |
39 | |
40 #include "cpu.h" | |
41 | |
42 namespace v8 { namespace internal { | |
43 | |
44 Condition NegateCondition(Condition cc) { | |
45 return static_cast<Condition>(cc ^ 1); | |
46 } | |
47 | |
48 | |
49 // The modes possibly affected by apply must be in kApplyMask. | |
50 void RelocInfo::apply(int delta) { | |
51 if (rmode_ == RUNTIME_ENTRY || IsCodeTarget(rmode_)) { | |
52 int32_t* p = reinterpret_cast<int32_t*>(pc_); | |
53 *p -= delta; // relocate entry | |
54 } else if (rmode_ == JS_RETURN && IsCallInstruction()) { | |
55 // Special handling of js_return when a break point is set (call | |
56 // instruction has been inserted). | |
57 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1); | |
58 *p -= delta; // relocate entry | |
59 } else if (IsInternalReference(rmode_)) { | |
60 // absolute code pointer inside code object moves with the code object. | |
61 int32_t* p = reinterpret_cast<int32_t*>(pc_); | |
62 *p += delta; // relocate entry | |
63 } | |
64 } | |
65 | |
66 | |
67 Address RelocInfo::target_address() { | |
68 ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY); | |
69 return Assembler::target_address_at(pc_); | |
70 } | |
71 | |
72 | |
73 Address RelocInfo::target_address_address() { | |
74 ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY); | |
75 return reinterpret_cast<Address>(pc_); | |
76 } | |
77 | |
78 | |
79 void RelocInfo::set_target_address(Address target) { | |
80 ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY); | |
81 Assembler::set_target_address_at(pc_, target); | |
82 } | |
83 | |
84 | |
85 Object* RelocInfo::target_object() { | |
86 ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT); | |
87 return *reinterpret_cast<Object**>(pc_); | |
88 } | |
89 | |
90 | |
91 Object** RelocInfo::target_object_address() { | |
92 ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT); | |
93 return reinterpret_cast<Object**>(pc_); | |
94 } | |
95 | |
96 | |
97 void RelocInfo::set_target_object(Object* target) { | |
98 ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT); | |
99 *reinterpret_cast<Object**>(pc_) = target; | |
100 } | |
101 | |
102 | |
103 Address* RelocInfo::target_reference_address() { | |
104 ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE); | |
105 return reinterpret_cast<Address*>(pc_); | |
106 } | |
107 | |
108 | |
109 Address RelocInfo::call_address() { | |
110 ASSERT(IsCallInstruction()); | |
111 return Assembler::target_address_at(pc_ + 1); | |
112 } | |
113 | |
114 | |
115 void RelocInfo::set_call_address(Address target) { | |
116 ASSERT(IsCallInstruction()); | |
117 Assembler::set_target_address_at(pc_ + 1, target); | |
118 } | |
119 | |
120 | |
121 Object* RelocInfo::call_object() { | |
122 ASSERT(IsCallInstruction()); | |
123 return *call_object_address(); | |
124 } | |
125 | |
126 | |
127 Object** RelocInfo::call_object_address() { | |
128 ASSERT(IsCallInstruction()); | |
129 return reinterpret_cast<Object**>(pc_ + 1); | |
130 } | |
131 | |
132 | |
133 void RelocInfo::set_call_object(Object* target) { | |
134 ASSERT(IsCallInstruction()); | |
135 *call_object_address() = target; | |
136 } | |
137 | |
138 | |
139 bool RelocInfo::IsCallInstruction() { | |
140 return *pc_ == 0xE8; | |
141 } | |
142 | |
143 | |
144 Immediate::Immediate(int x) { | |
145 x_ = x; | |
146 rmode_ = RelocInfo::NONE; | |
147 } | |
148 | |
149 | |
150 Immediate::Immediate(const ExternalReference& ext) { | |
151 x_ = reinterpret_cast<int32_t>(ext.address()); | |
152 rmode_ = RelocInfo::EXTERNAL_REFERENCE; | |
153 } | |
154 | |
155 Immediate::Immediate(const char* s) { | |
156 x_ = reinterpret_cast<int32_t>(s); | |
157 rmode_ = RelocInfo::EMBEDDED_STRING; | |
158 } | |
159 | |
160 | |
161 Immediate::Immediate(Label *internal_offset) { | |
162 x_ = reinterpret_cast<int32_t>(internal_offset); | |
163 rmode_ = RelocInfo::INTERNAL_REFERENCE; | |
164 } | |
165 | |
166 | |
167 Immediate::Immediate(Handle<Object> handle) { | |
168 // Verify all Objects referred by code are NOT in new space. | |
169 Object* obj = *handle; | |
170 ASSERT(!Heap::InNewSpace(obj)); | |
171 if (obj->IsHeapObject()) { | |
172 x_ = reinterpret_cast<intptr_t>(handle.location()); | |
173 rmode_ = RelocInfo::EMBEDDED_OBJECT; | |
174 } else { | |
175 // no relocation needed | |
176 x_ = reinterpret_cast<intptr_t>(obj); | |
177 rmode_ = RelocInfo::NONE; | |
178 } | |
179 } | |
180 | |
181 | |
182 Immediate::Immediate(Smi* value) { | |
183 x_ = reinterpret_cast<intptr_t>(value); | |
184 rmode_ = RelocInfo::NONE; | |
185 } | |
186 | |
187 | |
188 void Assembler::emit(uint32_t x) { | |
189 *reinterpret_cast<uint32_t*>(pc_) = x; | |
190 pc_ += sizeof(uint32_t); | |
191 } | |
192 | |
193 | |
194 void Assembler::emit(Handle<Object> handle) { | |
195 // Verify all Objects referred by code are NOT in new space. | |
196 Object* obj = *handle; | |
197 ASSERT(!Heap::InNewSpace(obj)); | |
198 if (obj->IsHeapObject()) { | |
199 emit(reinterpret_cast<intptr_t>(handle.location()), | |
200 RelocInfo::EMBEDDED_OBJECT); | |
201 } else { | |
202 // no relocation needed | |
203 emit(reinterpret_cast<intptr_t>(obj)); | |
204 } | |
205 } | |
206 | |
207 | |
208 void Assembler::emit(uint32_t x, RelocInfo::Mode rmode) { | |
209 if (rmode != RelocInfo::NONE) RecordRelocInfo(rmode); | |
210 emit(x); | |
211 } | |
212 | |
213 | |
214 void Assembler::emit(const Immediate& x) { | |
215 if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) { | |
216 Label* label = reinterpret_cast<Label*>(x.x_); | |
217 emit_code_relative_offset(label); | |
218 return; | |
219 } | |
220 if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_); | |
221 emit(x.x_); | |
222 } | |
223 | |
224 | |
225 void Assembler::emit_code_relative_offset(Label* label) { | |
226 if (label->is_bound()) { | |
227 int32_t pos; | |
228 pos = label->pos() + Code::kHeaderSize - kHeapObjectTag; | |
229 emit(pos); | |
230 } else { | |
231 emit_disp(label, Displacement::CODE_RELATIVE); | |
232 } | |
233 } | |
234 | |
235 | |
236 void Assembler::emit_w(const Immediate& x) { | |
237 ASSERT(x.rmode_ == RelocInfo::NONE); | |
238 uint16_t value = static_cast<uint16_t>(x.x_); | |
239 reinterpret_cast<uint16_t*>(pc_)[0] = value; | |
240 pc_ += sizeof(uint16_t); | |
241 } | |
242 | |
243 | |
244 Address Assembler::target_address_at(Address pc) { | |
245 return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc); | |
246 } | |
247 | |
248 | |
249 void Assembler::set_target_address_at(Address pc, Address target) { | |
250 int32_t* p = reinterpret_cast<int32_t*>(pc); | |
251 *p = target - (pc + sizeof(int32_t)); | |
252 CPU::FlushICache(p, sizeof(int32_t)); | |
253 } | |
254 | |
255 | |
256 Displacement Assembler::disp_at(Label* L) { | |
257 return Displacement(long_at(L->pos())); | |
258 } | |
259 | |
260 | |
261 void Assembler::disp_at_put(Label* L, Displacement disp) { | |
262 long_at_put(L->pos(), disp.data()); | |
263 } | |
264 | |
265 | |
266 void Assembler::emit_disp(Label* L, Displacement::Type type) { | |
267 Displacement disp(L, type); | |
268 L->link_to(pc_offset()); | |
269 emit(static_cast<int>(disp.data())); | |
270 } | |
271 | |
272 | |
273 void Operand::set_modrm(int mod, Register rm) { | |
274 ASSERT((mod & -4) == 0); | |
275 buf_[0] = mod << 6 | rm.code(); | |
276 len_ = 1; | |
277 } | |
278 | |
279 | |
280 void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) { | |
281 ASSERT(len_ == 1 || len_ == 2); | |
282 int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]); | |
283 *p = disp; | |
284 len_ += sizeof(int32_t); | |
285 rmode_ = rmode; | |
286 } | |
287 | |
288 Operand::Operand(Register reg) { | |
289 // reg | |
290 set_modrm(3, reg); | |
291 } | |
292 | |
293 | |
294 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) { | |
295 // [disp/r] | |
296 set_modrm(0, ebp); | |
297 set_dispr(disp, rmode); | |
298 } | |
299 | |
300 } } // namespace v8::internal | |
301 | |
302 #endif // V8_ASSEMBLER_IA32_INL_H_ | |
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