assembler-ia32-inl.h revision 257744e915dfc84d6d07a6b2accf8402d9ffc708
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// 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 // TODO(isolates): Get a cached isolate below. 208 } else if (((RelocInfo::IsJSReturn(mode) && 209 IsPatchedReturnSequence()) || 210 (RelocInfo::IsDebugBreakSlot(mode) && 211 IsPatchedDebugBreakSlotSequence())) && 212 Isolate::Current()->debug()->has_break_points()) { 213 visitor->VisitDebugTarget(this); 214#endif 215 } else if (mode == RelocInfo::RUNTIME_ENTRY) { 216 visitor->VisitRuntimeEntry(this); 217 } 218} 219 220 221template<typename StaticVisitor> 222void RelocInfo::Visit(Heap* heap) { 223 RelocInfo::Mode mode = rmode(); 224 if (mode == RelocInfo::EMBEDDED_OBJECT) { 225 StaticVisitor::VisitPointer(heap, target_object_address()); 226 CPU::FlushICache(pc_, sizeof(Address)); 227 } else if (RelocInfo::IsCodeTarget(mode)) { 228 StaticVisitor::VisitCodeTarget(heap, this); 229 } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) { 230 StaticVisitor::VisitGlobalPropertyCell(heap, this); 231 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) { 232 StaticVisitor::VisitExternalReference(target_reference_address()); 233 CPU::FlushICache(pc_, sizeof(Address)); 234#ifdef ENABLE_DEBUGGER_SUPPORT 235 } else if (heap->isolate()->debug()->has_break_points() && 236 ((RelocInfo::IsJSReturn(mode) && 237 IsPatchedReturnSequence()) || 238 (RelocInfo::IsDebugBreakSlot(mode) && 239 IsPatchedDebugBreakSlotSequence()))) { 240 StaticVisitor::VisitDebugTarget(heap, this); 241#endif 242 } else if (mode == RelocInfo::RUNTIME_ENTRY) { 243 StaticVisitor::VisitRuntimeEntry(this); 244 } 245} 246 247 248 249Immediate::Immediate(int x) { 250 x_ = x; 251 rmode_ = RelocInfo::NONE; 252} 253 254 255Immediate::Immediate(const ExternalReference& ext) { 256 x_ = reinterpret_cast<int32_t>(ext.address()); 257 rmode_ = RelocInfo::EXTERNAL_REFERENCE; 258} 259 260 261Immediate::Immediate(Label* internal_offset) { 262 x_ = reinterpret_cast<int32_t>(internal_offset); 263 rmode_ = RelocInfo::INTERNAL_REFERENCE; 264} 265 266 267Immediate::Immediate(Handle<Object> handle) { 268 // Verify all Objects referred by code are NOT in new space. 269 Object* obj = *handle; 270 ASSERT(!HEAP->InNewSpace(obj)); 271 if (obj->IsHeapObject()) { 272 x_ = reinterpret_cast<intptr_t>(handle.location()); 273 rmode_ = RelocInfo::EMBEDDED_OBJECT; 274 } else { 275 // no relocation needed 276 x_ = reinterpret_cast<intptr_t>(obj); 277 rmode_ = RelocInfo::NONE; 278 } 279} 280 281 282Immediate::Immediate(Smi* value) { 283 x_ = reinterpret_cast<intptr_t>(value); 284 rmode_ = RelocInfo::NONE; 285} 286 287 288Immediate::Immediate(Address addr) { 289 x_ = reinterpret_cast<int32_t>(addr); 290 rmode_ = RelocInfo::NONE; 291} 292 293 294void Assembler::emit(uint32_t x) { 295 *reinterpret_cast<uint32_t*>(pc_) = x; 296 pc_ += sizeof(uint32_t); 297} 298 299 300void Assembler::emit(Handle<Object> handle) { 301 // Verify all Objects referred by code are NOT in new space. 302 Object* obj = *handle; 303 ASSERT(!isolate()->heap()->InNewSpace(obj)); 304 if (obj->IsHeapObject()) { 305 emit(reinterpret_cast<intptr_t>(handle.location()), 306 RelocInfo::EMBEDDED_OBJECT); 307 } else { 308 // no relocation needed 309 emit(reinterpret_cast<intptr_t>(obj)); 310 } 311} 312 313 314void Assembler::emit(uint32_t x, RelocInfo::Mode rmode, unsigned id) { 315 if (rmode == RelocInfo::CODE_TARGET && id != kNoASTId) { 316 RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, static_cast<intptr_t>(id)); 317 } else if (rmode != RelocInfo::NONE) { 318 RecordRelocInfo(rmode); 319 } 320 emit(x); 321} 322 323 324void Assembler::emit(const Immediate& x) { 325 if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) { 326 Label* label = reinterpret_cast<Label*>(x.x_); 327 emit_code_relative_offset(label); 328 return; 329 } 330 if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_); 331 emit(x.x_); 332} 333 334 335void Assembler::emit_code_relative_offset(Label* label) { 336 if (label->is_bound()) { 337 int32_t pos; 338 pos = label->pos() + Code::kHeaderSize - kHeapObjectTag; 339 emit(pos); 340 } else { 341 emit_disp(label, Displacement::CODE_RELATIVE); 342 } 343} 344 345 346void Assembler::emit_w(const Immediate& x) { 347 ASSERT(x.rmode_ == RelocInfo::NONE); 348 uint16_t value = static_cast<uint16_t>(x.x_); 349 reinterpret_cast<uint16_t*>(pc_)[0] = value; 350 pc_ += sizeof(uint16_t); 351} 352 353 354Address Assembler::target_address_at(Address pc) { 355 return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc); 356} 357 358 359void Assembler::set_target_address_at(Address pc, Address target) { 360 int32_t* p = reinterpret_cast<int32_t*>(pc); 361 *p = target - (pc + sizeof(int32_t)); 362 CPU::FlushICache(p, sizeof(int32_t)); 363} 364 365 366Displacement Assembler::disp_at(Label* L) { 367 return Displacement(long_at(L->pos())); 368} 369 370 371void Assembler::disp_at_put(Label* L, Displacement disp) { 372 long_at_put(L->pos(), disp.data()); 373} 374 375 376void Assembler::emit_disp(Label* L, Displacement::Type type) { 377 Displacement disp(L, type); 378 L->link_to(pc_offset()); 379 emit(static_cast<int>(disp.data())); 380} 381 382 383void Assembler::emit_near_disp(Label* L) { 384 byte disp = 0x00; 385 if (L->is_near_linked()) { 386 int offset = L->near_link_pos() - pc_offset(); 387 ASSERT(is_int8(offset)); 388 disp = static_cast<byte>(offset & 0xFF); 389 } 390 L->link_to(pc_offset(), Label::kNear); 391 *pc_++ = disp; 392} 393 394 395void Operand::set_modrm(int mod, Register rm) { 396 ASSERT((mod & -4) == 0); 397 buf_[0] = mod << 6 | rm.code(); 398 len_ = 1; 399} 400 401 402void Operand::set_sib(ScaleFactor scale, Register index, Register base) { 403 ASSERT(len_ == 1); 404 ASSERT((scale & -4) == 0); 405 // Use SIB with no index register only for base esp. 406 ASSERT(!index.is(esp) || base.is(esp)); 407 buf_[1] = scale << 6 | index.code() << 3 | base.code(); 408 len_ = 2; 409} 410 411 412void Operand::set_disp8(int8_t disp) { 413 ASSERT(len_ == 1 || len_ == 2); 414 *reinterpret_cast<int8_t*>(&buf_[len_++]) = disp; 415} 416 417 418void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) { 419 ASSERT(len_ == 1 || len_ == 2); 420 int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]); 421 *p = disp; 422 len_ += sizeof(int32_t); 423 rmode_ = rmode; 424} 425 426Operand::Operand(Register reg) { 427 // reg 428 set_modrm(3, reg); 429} 430 431 432Operand::Operand(XMMRegister xmm_reg) { 433 Register reg = { xmm_reg.code() }; 434 set_modrm(3, reg); 435} 436 437 438Operand::Operand(int32_t disp, RelocInfo::Mode rmode) { 439 // [disp/r] 440 set_modrm(0, ebp); 441 set_dispr(disp, rmode); 442} 443 444} } // namespace v8::internal 445 446#endif // V8_IA32_ASSEMBLER_IA32_INL_H_ 447