Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 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 |
| 6 | // are 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 |
| 14 | // distribution. |
| 15 | // |
| 16 | // - Neither the name of Sun Microsystems or the names of contributors may |
| 17 | // be used to endorse or promote products derived from this software without |
| 18 | // specific prior written permission. |
| 19 | // |
| 20 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 23 | // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 24 | // COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 25 | // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 26 | // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 27 | // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 29 | // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 30 | // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 31 | // OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 33 | // The original source code covered by the above license above has been |
| 34 | // modified significantly by Google Inc. |
| 35 | // Copyright 2010 the V8 project authors. All rights reserved. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 36 | |
| 37 | #include "v8.h" |
| 38 | |
| 39 | #include "arm/assembler-arm-inl.h" |
| 40 | #include "serialize.h" |
| 41 | |
| 42 | namespace v8 { |
| 43 | namespace internal { |
| 44 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 45 | // Safe default is no features. |
| 46 | unsigned CpuFeatures::supported_ = 0; |
| 47 | unsigned CpuFeatures::enabled_ = 0; |
| 48 | unsigned CpuFeatures::found_by_runtime_probing_ = 0; |
| 49 | |
| 50 | void CpuFeatures::Probe() { |
| 51 | // If the compiler is allowed to use vfp then we can use vfp too in our |
| 52 | // code generation. |
| 53 | #if !defined(__arm__) |
| 54 | // For the simulator=arm build, always use VFP since the arm simulator has |
| 55 | // VFP support. |
| 56 | supported_ |= 1u << VFP3; |
| 57 | #else |
| 58 | if (Serializer::enabled()) { |
| 59 | supported_ |= OS::CpuFeaturesImpliedByPlatform(); |
| 60 | return; // No features if we might serialize. |
| 61 | } |
| 62 | |
| 63 | if (OS::ArmCpuHasFeature(VFP3)) { |
| 64 | // This implementation also sets the VFP flags if |
| 65 | // runtime detection of VFP returns true. |
| 66 | supported_ |= 1u << VFP3; |
| 67 | found_by_runtime_probing_ |= 1u << VFP3; |
| 68 | } |
| 69 | #endif |
| 70 | } |
| 71 | |
| 72 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 73 | // ----------------------------------------------------------------------------- |
| 74 | // Implementation of Register and CRegister |
| 75 | |
| 76 | Register no_reg = { -1 }; |
| 77 | |
| 78 | Register r0 = { 0 }; |
| 79 | Register r1 = { 1 }; |
| 80 | Register r2 = { 2 }; |
| 81 | Register r3 = { 3 }; |
| 82 | Register r4 = { 4 }; |
| 83 | Register r5 = { 5 }; |
| 84 | Register r6 = { 6 }; |
| 85 | Register r7 = { 7 }; |
| 86 | Register r8 = { 8 }; |
| 87 | Register r9 = { 9 }; |
| 88 | Register r10 = { 10 }; |
| 89 | Register fp = { 11 }; |
| 90 | Register ip = { 12 }; |
| 91 | Register sp = { 13 }; |
| 92 | Register lr = { 14 }; |
| 93 | Register pc = { 15 }; |
| 94 | |
| 95 | |
| 96 | CRegister no_creg = { -1 }; |
| 97 | |
| 98 | CRegister cr0 = { 0 }; |
| 99 | CRegister cr1 = { 1 }; |
| 100 | CRegister cr2 = { 2 }; |
| 101 | CRegister cr3 = { 3 }; |
| 102 | CRegister cr4 = { 4 }; |
| 103 | CRegister cr5 = { 5 }; |
| 104 | CRegister cr6 = { 6 }; |
| 105 | CRegister cr7 = { 7 }; |
| 106 | CRegister cr8 = { 8 }; |
| 107 | CRegister cr9 = { 9 }; |
| 108 | CRegister cr10 = { 10 }; |
| 109 | CRegister cr11 = { 11 }; |
| 110 | CRegister cr12 = { 12 }; |
| 111 | CRegister cr13 = { 13 }; |
| 112 | CRegister cr14 = { 14 }; |
| 113 | CRegister cr15 = { 15 }; |
| 114 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 115 | // Support for the VFP registers s0 to s31 (d0 to d15). |
| 116 | // Note that "sN:sM" is the same as "dN/2". |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 117 | SwVfpRegister s0 = { 0 }; |
| 118 | SwVfpRegister s1 = { 1 }; |
| 119 | SwVfpRegister s2 = { 2 }; |
| 120 | SwVfpRegister s3 = { 3 }; |
| 121 | SwVfpRegister s4 = { 4 }; |
| 122 | SwVfpRegister s5 = { 5 }; |
| 123 | SwVfpRegister s6 = { 6 }; |
| 124 | SwVfpRegister s7 = { 7 }; |
| 125 | SwVfpRegister s8 = { 8 }; |
| 126 | SwVfpRegister s9 = { 9 }; |
| 127 | SwVfpRegister s10 = { 10 }; |
| 128 | SwVfpRegister s11 = { 11 }; |
| 129 | SwVfpRegister s12 = { 12 }; |
| 130 | SwVfpRegister s13 = { 13 }; |
| 131 | SwVfpRegister s14 = { 14 }; |
| 132 | SwVfpRegister s15 = { 15 }; |
| 133 | SwVfpRegister s16 = { 16 }; |
| 134 | SwVfpRegister s17 = { 17 }; |
| 135 | SwVfpRegister s18 = { 18 }; |
| 136 | SwVfpRegister s19 = { 19 }; |
| 137 | SwVfpRegister s20 = { 20 }; |
| 138 | SwVfpRegister s21 = { 21 }; |
| 139 | SwVfpRegister s22 = { 22 }; |
| 140 | SwVfpRegister s23 = { 23 }; |
| 141 | SwVfpRegister s24 = { 24 }; |
| 142 | SwVfpRegister s25 = { 25 }; |
| 143 | SwVfpRegister s26 = { 26 }; |
| 144 | SwVfpRegister s27 = { 27 }; |
| 145 | SwVfpRegister s28 = { 28 }; |
| 146 | SwVfpRegister s29 = { 29 }; |
| 147 | SwVfpRegister s30 = { 30 }; |
| 148 | SwVfpRegister s31 = { 31 }; |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 149 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 150 | DwVfpRegister d0 = { 0 }; |
| 151 | DwVfpRegister d1 = { 1 }; |
| 152 | DwVfpRegister d2 = { 2 }; |
| 153 | DwVfpRegister d3 = { 3 }; |
| 154 | DwVfpRegister d4 = { 4 }; |
| 155 | DwVfpRegister d5 = { 5 }; |
| 156 | DwVfpRegister d6 = { 6 }; |
| 157 | DwVfpRegister d7 = { 7 }; |
| 158 | DwVfpRegister d8 = { 8 }; |
| 159 | DwVfpRegister d9 = { 9 }; |
| 160 | DwVfpRegister d10 = { 10 }; |
| 161 | DwVfpRegister d11 = { 11 }; |
| 162 | DwVfpRegister d12 = { 12 }; |
| 163 | DwVfpRegister d13 = { 13 }; |
| 164 | DwVfpRegister d14 = { 14 }; |
| 165 | DwVfpRegister d15 = { 15 }; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 166 | |
| 167 | // ----------------------------------------------------------------------------- |
| 168 | // Implementation of RelocInfo |
| 169 | |
| 170 | const int RelocInfo::kApplyMask = 0; |
| 171 | |
| 172 | |
| 173 | void RelocInfo::PatchCode(byte* instructions, int instruction_count) { |
| 174 | // Patch the code at the current address with the supplied instructions. |
| 175 | Instr* pc = reinterpret_cast<Instr*>(pc_); |
| 176 | Instr* instr = reinterpret_cast<Instr*>(instructions); |
| 177 | for (int i = 0; i < instruction_count; i++) { |
| 178 | *(pc + i) = *(instr + i); |
| 179 | } |
| 180 | |
| 181 | // Indicate that code has changed. |
| 182 | CPU::FlushICache(pc_, instruction_count * Assembler::kInstrSize); |
| 183 | } |
| 184 | |
| 185 | |
| 186 | // Patch the code at the current PC with a call to the target address. |
| 187 | // Additional guard instructions can be added if required. |
| 188 | void RelocInfo::PatchCodeWithCall(Address target, int guard_bytes) { |
| 189 | // Patch the code at the current address with a call to the target. |
| 190 | UNIMPLEMENTED(); |
| 191 | } |
| 192 | |
| 193 | |
| 194 | // ----------------------------------------------------------------------------- |
| 195 | // Implementation of Operand and MemOperand |
| 196 | // See assembler-arm-inl.h for inlined constructors |
| 197 | |
| 198 | Operand::Operand(Handle<Object> handle) { |
| 199 | rm_ = no_reg; |
| 200 | // Verify all Objects referred by code are NOT in new space. |
| 201 | Object* obj = *handle; |
| 202 | ASSERT(!Heap::InNewSpace(obj)); |
| 203 | if (obj->IsHeapObject()) { |
| 204 | imm32_ = reinterpret_cast<intptr_t>(handle.location()); |
| 205 | rmode_ = RelocInfo::EMBEDDED_OBJECT; |
| 206 | } else { |
| 207 | // no relocation needed |
| 208 | imm32_ = reinterpret_cast<intptr_t>(obj); |
| 209 | rmode_ = RelocInfo::NONE; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | |
| 214 | Operand::Operand(Register rm, ShiftOp shift_op, int shift_imm) { |
| 215 | ASSERT(is_uint5(shift_imm)); |
| 216 | ASSERT(shift_op != ROR || shift_imm != 0); // use RRX if you mean it |
| 217 | rm_ = rm; |
| 218 | rs_ = no_reg; |
| 219 | shift_op_ = shift_op; |
| 220 | shift_imm_ = shift_imm & 31; |
| 221 | if (shift_op == RRX) { |
| 222 | // encoded as ROR with shift_imm == 0 |
| 223 | ASSERT(shift_imm == 0); |
| 224 | shift_op_ = ROR; |
| 225 | shift_imm_ = 0; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | |
| 230 | Operand::Operand(Register rm, ShiftOp shift_op, Register rs) { |
| 231 | ASSERT(shift_op != RRX); |
| 232 | rm_ = rm; |
| 233 | rs_ = no_reg; |
| 234 | shift_op_ = shift_op; |
| 235 | rs_ = rs; |
| 236 | } |
| 237 | |
| 238 | |
| 239 | MemOperand::MemOperand(Register rn, int32_t offset, AddrMode am) { |
| 240 | rn_ = rn; |
| 241 | rm_ = no_reg; |
| 242 | offset_ = offset; |
| 243 | am_ = am; |
| 244 | } |
| 245 | |
| 246 | MemOperand::MemOperand(Register rn, Register rm, AddrMode am) { |
| 247 | rn_ = rn; |
| 248 | rm_ = rm; |
| 249 | shift_op_ = LSL; |
| 250 | shift_imm_ = 0; |
| 251 | am_ = am; |
| 252 | } |
| 253 | |
| 254 | |
| 255 | MemOperand::MemOperand(Register rn, Register rm, |
| 256 | ShiftOp shift_op, int shift_imm, AddrMode am) { |
| 257 | ASSERT(is_uint5(shift_imm)); |
| 258 | rn_ = rn; |
| 259 | rm_ = rm; |
| 260 | shift_op_ = shift_op; |
| 261 | shift_imm_ = shift_imm & 31; |
| 262 | am_ = am; |
| 263 | } |
| 264 | |
| 265 | |
| 266 | // ----------------------------------------------------------------------------- |
| 267 | // Implementation of Assembler |
| 268 | |
| 269 | // Instruction encoding bits |
| 270 | enum { |
| 271 | H = 1 << 5, // halfword (or byte) |
| 272 | S6 = 1 << 6, // signed (or unsigned) |
| 273 | L = 1 << 20, // load (or store) |
| 274 | S = 1 << 20, // set condition code (or leave unchanged) |
| 275 | W = 1 << 21, // writeback base register (or leave unchanged) |
| 276 | A = 1 << 21, // accumulate in multiply instruction (or not) |
| 277 | B = 1 << 22, // unsigned byte (or word) |
| 278 | N = 1 << 22, // long (or short) |
| 279 | U = 1 << 23, // positive (or negative) offset/index |
| 280 | P = 1 << 24, // offset/pre-indexed addressing (or post-indexed addressing) |
| 281 | I = 1 << 25, // immediate shifter operand (or not) |
| 282 | |
| 283 | B4 = 1 << 4, |
| 284 | B5 = 1 << 5, |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 285 | B6 = 1 << 6, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 286 | B7 = 1 << 7, |
| 287 | B8 = 1 << 8, |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 288 | B9 = 1 << 9, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 289 | B12 = 1 << 12, |
| 290 | B16 = 1 << 16, |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 291 | B18 = 1 << 18, |
| 292 | B19 = 1 << 19, |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 293 | B20 = 1 << 20, |
| 294 | B21 = 1 << 21, |
| 295 | B22 = 1 << 22, |
| 296 | B23 = 1 << 23, |
| 297 | B24 = 1 << 24, |
| 298 | B25 = 1 << 25, |
| 299 | B26 = 1 << 26, |
| 300 | B27 = 1 << 27, |
| 301 | |
| 302 | // Instruction bit masks |
| 303 | RdMask = 15 << 12, // in str instruction |
| 304 | CondMask = 15 << 28, |
| 305 | CoprocessorMask = 15 << 8, |
| 306 | OpCodeMask = 15 << 21, // in data-processing instructions |
| 307 | Imm24Mask = (1 << 24) - 1, |
| 308 | Off12Mask = (1 << 12) - 1, |
| 309 | // Reserved condition |
| 310 | nv = 15 << 28 |
| 311 | }; |
| 312 | |
| 313 | |
| 314 | // add(sp, sp, 4) instruction (aka Pop()) |
| 315 | static const Instr kPopInstruction = |
| 316 | al | 4 * B21 | 4 | LeaveCC | I | sp.code() * B16 | sp.code() * B12; |
| 317 | // str(r, MemOperand(sp, 4, NegPreIndex), al) instruction (aka push(r)) |
| 318 | // register r is not encoded. |
| 319 | static const Instr kPushRegPattern = |
| 320 | al | B26 | 4 | NegPreIndex | sp.code() * B16; |
| 321 | // ldr(r, MemOperand(sp, 4, PostIndex), al) instruction (aka pop(r)) |
| 322 | // register r is not encoded. |
| 323 | static const Instr kPopRegPattern = |
| 324 | al | B26 | L | 4 | PostIndex | sp.code() * B16; |
| 325 | // mov lr, pc |
| 326 | const Instr kMovLrPc = al | 13*B21 | pc.code() | lr.code() * B12; |
| 327 | // ldr pc, [pc, #XXX] |
| 328 | const Instr kLdrPCPattern = al | B26 | L | pc.code() * B16; |
| 329 | |
| 330 | // spare_buffer_ |
| 331 | static const int kMinimalBufferSize = 4*KB; |
| 332 | static byte* spare_buffer_ = NULL; |
| 333 | |
| 334 | Assembler::Assembler(void* buffer, int buffer_size) { |
| 335 | if (buffer == NULL) { |
| 336 | // do our own buffer management |
| 337 | if (buffer_size <= kMinimalBufferSize) { |
| 338 | buffer_size = kMinimalBufferSize; |
| 339 | |
| 340 | if (spare_buffer_ != NULL) { |
| 341 | buffer = spare_buffer_; |
| 342 | spare_buffer_ = NULL; |
| 343 | } |
| 344 | } |
| 345 | if (buffer == NULL) { |
| 346 | buffer_ = NewArray<byte>(buffer_size); |
| 347 | } else { |
| 348 | buffer_ = static_cast<byte*>(buffer); |
| 349 | } |
| 350 | buffer_size_ = buffer_size; |
| 351 | own_buffer_ = true; |
| 352 | |
| 353 | } else { |
| 354 | // use externally provided buffer instead |
| 355 | ASSERT(buffer_size > 0); |
| 356 | buffer_ = static_cast<byte*>(buffer); |
| 357 | buffer_size_ = buffer_size; |
| 358 | own_buffer_ = false; |
| 359 | } |
| 360 | |
| 361 | // setup buffer pointers |
| 362 | ASSERT(buffer_ != NULL); |
| 363 | pc_ = buffer_; |
| 364 | reloc_info_writer.Reposition(buffer_ + buffer_size, pc_); |
| 365 | num_prinfo_ = 0; |
| 366 | next_buffer_check_ = 0; |
| 367 | no_const_pool_before_ = 0; |
| 368 | last_const_pool_end_ = 0; |
| 369 | last_bound_pos_ = 0; |
| 370 | current_statement_position_ = RelocInfo::kNoPosition; |
| 371 | current_position_ = RelocInfo::kNoPosition; |
| 372 | written_statement_position_ = current_statement_position_; |
| 373 | written_position_ = current_position_; |
| 374 | } |
| 375 | |
| 376 | |
| 377 | Assembler::~Assembler() { |
| 378 | if (own_buffer_) { |
| 379 | if (spare_buffer_ == NULL && buffer_size_ == kMinimalBufferSize) { |
| 380 | spare_buffer_ = buffer_; |
| 381 | } else { |
| 382 | DeleteArray(buffer_); |
| 383 | } |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | |
| 388 | void Assembler::GetCode(CodeDesc* desc) { |
| 389 | // emit constant pool if necessary |
| 390 | CheckConstPool(true, false); |
| 391 | ASSERT(num_prinfo_ == 0); |
| 392 | |
| 393 | // setup desc |
| 394 | desc->buffer = buffer_; |
| 395 | desc->buffer_size = buffer_size_; |
| 396 | desc->instr_size = pc_offset(); |
| 397 | desc->reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos(); |
| 398 | } |
| 399 | |
| 400 | |
| 401 | void Assembler::Align(int m) { |
| 402 | ASSERT(m >= 4 && IsPowerOf2(m)); |
| 403 | while ((pc_offset() & (m - 1)) != 0) { |
| 404 | nop(); |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | |
| 409 | // Labels refer to positions in the (to be) generated code. |
| 410 | // There are bound, linked, and unused labels. |
| 411 | // |
| 412 | // Bound labels refer to known positions in the already |
| 413 | // generated code. pos() is the position the label refers to. |
| 414 | // |
| 415 | // Linked labels refer to unknown positions in the code |
| 416 | // to be generated; pos() is the position of the last |
| 417 | // instruction using the label. |
| 418 | |
| 419 | |
| 420 | // The link chain is terminated by a negative code position (must be aligned) |
| 421 | const int kEndOfChain = -4; |
| 422 | |
| 423 | |
| 424 | int Assembler::target_at(int pos) { |
| 425 | Instr instr = instr_at(pos); |
| 426 | if ((instr & ~Imm24Mask) == 0) { |
| 427 | // Emitted label constant, not part of a branch. |
| 428 | return instr - (Code::kHeaderSize - kHeapObjectTag); |
| 429 | } |
| 430 | ASSERT((instr & 7*B25) == 5*B25); // b, bl, or blx imm24 |
| 431 | int imm26 = ((instr & Imm24Mask) << 8) >> 6; |
| 432 | if ((instr & CondMask) == nv && (instr & B24) != 0) |
| 433 | // blx uses bit 24 to encode bit 2 of imm26 |
| 434 | imm26 += 2; |
| 435 | |
| 436 | return pos + kPcLoadDelta + imm26; |
| 437 | } |
| 438 | |
| 439 | |
| 440 | void Assembler::target_at_put(int pos, int target_pos) { |
| 441 | Instr instr = instr_at(pos); |
| 442 | if ((instr & ~Imm24Mask) == 0) { |
| 443 | ASSERT(target_pos == kEndOfChain || target_pos >= 0); |
| 444 | // Emitted label constant, not part of a branch. |
| 445 | // Make label relative to Code* of generated Code object. |
| 446 | instr_at_put(pos, target_pos + (Code::kHeaderSize - kHeapObjectTag)); |
| 447 | return; |
| 448 | } |
| 449 | int imm26 = target_pos - (pos + kPcLoadDelta); |
| 450 | ASSERT((instr & 7*B25) == 5*B25); // b, bl, or blx imm24 |
| 451 | if ((instr & CondMask) == nv) { |
| 452 | // blx uses bit 24 to encode bit 2 of imm26 |
| 453 | ASSERT((imm26 & 1) == 0); |
| 454 | instr = (instr & ~(B24 | Imm24Mask)) | ((imm26 & 2) >> 1)*B24; |
| 455 | } else { |
| 456 | ASSERT((imm26 & 3) == 0); |
| 457 | instr &= ~Imm24Mask; |
| 458 | } |
| 459 | int imm24 = imm26 >> 2; |
| 460 | ASSERT(is_int24(imm24)); |
| 461 | instr_at_put(pos, instr | (imm24 & Imm24Mask)); |
| 462 | } |
| 463 | |
| 464 | |
| 465 | void Assembler::print(Label* L) { |
| 466 | if (L->is_unused()) { |
| 467 | PrintF("unused label\n"); |
| 468 | } else if (L->is_bound()) { |
| 469 | PrintF("bound label to %d\n", L->pos()); |
| 470 | } else if (L->is_linked()) { |
| 471 | Label l = *L; |
| 472 | PrintF("unbound label"); |
| 473 | while (l.is_linked()) { |
| 474 | PrintF("@ %d ", l.pos()); |
| 475 | Instr instr = instr_at(l.pos()); |
| 476 | if ((instr & ~Imm24Mask) == 0) { |
| 477 | PrintF("value\n"); |
| 478 | } else { |
| 479 | ASSERT((instr & 7*B25) == 5*B25); // b, bl, or blx |
| 480 | int cond = instr & CondMask; |
| 481 | const char* b; |
| 482 | const char* c; |
| 483 | if (cond == nv) { |
| 484 | b = "blx"; |
| 485 | c = ""; |
| 486 | } else { |
| 487 | if ((instr & B24) != 0) |
| 488 | b = "bl"; |
| 489 | else |
| 490 | b = "b"; |
| 491 | |
| 492 | switch (cond) { |
| 493 | case eq: c = "eq"; break; |
| 494 | case ne: c = "ne"; break; |
| 495 | case hs: c = "hs"; break; |
| 496 | case lo: c = "lo"; break; |
| 497 | case mi: c = "mi"; break; |
| 498 | case pl: c = "pl"; break; |
| 499 | case vs: c = "vs"; break; |
| 500 | case vc: c = "vc"; break; |
| 501 | case hi: c = "hi"; break; |
| 502 | case ls: c = "ls"; break; |
| 503 | case ge: c = "ge"; break; |
| 504 | case lt: c = "lt"; break; |
| 505 | case gt: c = "gt"; break; |
| 506 | case le: c = "le"; break; |
| 507 | case al: c = ""; break; |
| 508 | default: |
| 509 | c = ""; |
| 510 | UNREACHABLE(); |
| 511 | } |
| 512 | } |
| 513 | PrintF("%s%s\n", b, c); |
| 514 | } |
| 515 | next(&l); |
| 516 | } |
| 517 | } else { |
| 518 | PrintF("label in inconsistent state (pos = %d)\n", L->pos_); |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | |
| 523 | void Assembler::bind_to(Label* L, int pos) { |
| 524 | ASSERT(0 <= pos && pos <= pc_offset()); // must have a valid binding position |
| 525 | while (L->is_linked()) { |
| 526 | int fixup_pos = L->pos(); |
| 527 | next(L); // call next before overwriting link with target at fixup_pos |
| 528 | target_at_put(fixup_pos, pos); |
| 529 | } |
| 530 | L->bind_to(pos); |
| 531 | |
| 532 | // Keep track of the last bound label so we don't eliminate any instructions |
| 533 | // before a bound label. |
| 534 | if (pos > last_bound_pos_) |
| 535 | last_bound_pos_ = pos; |
| 536 | } |
| 537 | |
| 538 | |
| 539 | void Assembler::link_to(Label* L, Label* appendix) { |
| 540 | if (appendix->is_linked()) { |
| 541 | if (L->is_linked()) { |
| 542 | // append appendix to L's list |
| 543 | int fixup_pos; |
| 544 | int link = L->pos(); |
| 545 | do { |
| 546 | fixup_pos = link; |
| 547 | link = target_at(fixup_pos); |
| 548 | } while (link > 0); |
| 549 | ASSERT(link == kEndOfChain); |
| 550 | target_at_put(fixup_pos, appendix->pos()); |
| 551 | } else { |
| 552 | // L is empty, simply use appendix |
| 553 | *L = *appendix; |
| 554 | } |
| 555 | } |
| 556 | appendix->Unuse(); // appendix should not be used anymore |
| 557 | } |
| 558 | |
| 559 | |
| 560 | void Assembler::bind(Label* L) { |
| 561 | ASSERT(!L->is_bound()); // label can only be bound once |
| 562 | bind_to(L, pc_offset()); |
| 563 | } |
| 564 | |
| 565 | |
| 566 | void Assembler::next(Label* L) { |
| 567 | ASSERT(L->is_linked()); |
| 568 | int link = target_at(L->pos()); |
| 569 | if (link > 0) { |
| 570 | L->link_to(link); |
| 571 | } else { |
| 572 | ASSERT(link == kEndOfChain); |
| 573 | L->Unuse(); |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | |
| 578 | // Low-level code emission routines depending on the addressing mode |
| 579 | static bool fits_shifter(uint32_t imm32, |
| 580 | uint32_t* rotate_imm, |
| 581 | uint32_t* immed_8, |
| 582 | Instr* instr) { |
| 583 | // imm32 must be unsigned |
| 584 | for (int rot = 0; rot < 16; rot++) { |
| 585 | uint32_t imm8 = (imm32 << 2*rot) | (imm32 >> (32 - 2*rot)); |
| 586 | if ((imm8 <= 0xff)) { |
| 587 | *rotate_imm = rot; |
| 588 | *immed_8 = imm8; |
| 589 | return true; |
| 590 | } |
| 591 | } |
| 592 | // if the opcode is mov or mvn and if ~imm32 fits, change the opcode |
| 593 | if (instr != NULL && (*instr & 0xd*B21) == 0xd*B21) { |
| 594 | if (fits_shifter(~imm32, rotate_imm, immed_8, NULL)) { |
| 595 | *instr ^= 0x2*B21; |
| 596 | return true; |
| 597 | } |
| 598 | } |
| 599 | return false; |
| 600 | } |
| 601 | |
| 602 | |
| 603 | // We have to use the temporary register for things that can be relocated even |
| 604 | // if they can be encoded in the ARM's 12 bits of immediate-offset instruction |
| 605 | // space. There is no guarantee that the relocated location can be similarly |
| 606 | // encoded. |
| 607 | static bool MustUseIp(RelocInfo::Mode rmode) { |
| 608 | if (rmode == RelocInfo::EXTERNAL_REFERENCE) { |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 609 | #ifdef DEBUG |
| 610 | if (!Serializer::enabled()) { |
| 611 | Serializer::TooLateToEnableNow(); |
| 612 | } |
| 613 | #endif |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 614 | return Serializer::enabled(); |
| 615 | } else if (rmode == RelocInfo::NONE) { |
| 616 | return false; |
| 617 | } |
| 618 | return true; |
| 619 | } |
| 620 | |
| 621 | |
| 622 | void Assembler::addrmod1(Instr instr, |
| 623 | Register rn, |
| 624 | Register rd, |
| 625 | const Operand& x) { |
| 626 | CheckBuffer(); |
| 627 | ASSERT((instr & ~(CondMask | OpCodeMask | S)) == 0); |
| 628 | if (!x.rm_.is_valid()) { |
| 629 | // immediate |
| 630 | uint32_t rotate_imm; |
| 631 | uint32_t immed_8; |
| 632 | if (MustUseIp(x.rmode_) || |
| 633 | !fits_shifter(x.imm32_, &rotate_imm, &immed_8, &instr)) { |
| 634 | // The immediate operand cannot be encoded as a shifter operand, so load |
| 635 | // it first to register ip and change the original instruction to use ip. |
| 636 | // However, if the original instruction is a 'mov rd, x' (not setting the |
| 637 | // condition code), then replace it with a 'ldr rd, [pc]' |
| 638 | RecordRelocInfo(x.rmode_, x.imm32_); |
| 639 | CHECK(!rn.is(ip)); // rn should never be ip, or will be trashed |
| 640 | Condition cond = static_cast<Condition>(instr & CondMask); |
| 641 | if ((instr & ~CondMask) == 13*B21) { // mov, S not set |
| 642 | ldr(rd, MemOperand(pc, 0), cond); |
| 643 | } else { |
| 644 | ldr(ip, MemOperand(pc, 0), cond); |
| 645 | addrmod1(instr, rn, rd, Operand(ip)); |
| 646 | } |
| 647 | return; |
| 648 | } |
| 649 | instr |= I | rotate_imm*B8 | immed_8; |
| 650 | } else if (!x.rs_.is_valid()) { |
| 651 | // immediate shift |
| 652 | instr |= x.shift_imm_*B7 | x.shift_op_ | x.rm_.code(); |
| 653 | } else { |
| 654 | // register shift |
| 655 | ASSERT(!rn.is(pc) && !rd.is(pc) && !x.rm_.is(pc) && !x.rs_.is(pc)); |
| 656 | instr |= x.rs_.code()*B8 | x.shift_op_ | B4 | x.rm_.code(); |
| 657 | } |
| 658 | emit(instr | rn.code()*B16 | rd.code()*B12); |
| 659 | if (rn.is(pc) || x.rm_.is(pc)) |
| 660 | // block constant pool emission for one instruction after reading pc |
| 661 | BlockConstPoolBefore(pc_offset() + kInstrSize); |
| 662 | } |
| 663 | |
| 664 | |
| 665 | void Assembler::addrmod2(Instr instr, Register rd, const MemOperand& x) { |
| 666 | ASSERT((instr & ~(CondMask | B | L)) == B26); |
| 667 | int am = x.am_; |
| 668 | if (!x.rm_.is_valid()) { |
| 669 | // immediate offset |
| 670 | int offset_12 = x.offset_; |
| 671 | if (offset_12 < 0) { |
| 672 | offset_12 = -offset_12; |
| 673 | am ^= U; |
| 674 | } |
| 675 | if (!is_uint12(offset_12)) { |
| 676 | // immediate offset cannot be encoded, load it first to register ip |
| 677 | // rn (and rd in a load) should never be ip, or will be trashed |
| 678 | ASSERT(!x.rn_.is(ip) && ((instr & L) == L || !rd.is(ip))); |
| 679 | mov(ip, Operand(x.offset_), LeaveCC, |
| 680 | static_cast<Condition>(instr & CondMask)); |
| 681 | addrmod2(instr, rd, MemOperand(x.rn_, ip, x.am_)); |
| 682 | return; |
| 683 | } |
| 684 | ASSERT(offset_12 >= 0); // no masking needed |
| 685 | instr |= offset_12; |
| 686 | } else { |
| 687 | // register offset (shift_imm_ and shift_op_ are 0) or scaled |
| 688 | // register offset the constructors make sure than both shift_imm_ |
| 689 | // and shift_op_ are initialized |
| 690 | ASSERT(!x.rm_.is(pc)); |
| 691 | instr |= B25 | x.shift_imm_*B7 | x.shift_op_ | x.rm_.code(); |
| 692 | } |
| 693 | ASSERT((am & (P|W)) == P || !x.rn_.is(pc)); // no pc base with writeback |
| 694 | emit(instr | am | x.rn_.code()*B16 | rd.code()*B12); |
| 695 | } |
| 696 | |
| 697 | |
| 698 | void Assembler::addrmod3(Instr instr, Register rd, const MemOperand& x) { |
| 699 | ASSERT((instr & ~(CondMask | L | S6 | H)) == (B4 | B7)); |
| 700 | ASSERT(x.rn_.is_valid()); |
| 701 | int am = x.am_; |
| 702 | if (!x.rm_.is_valid()) { |
| 703 | // immediate offset |
| 704 | int offset_8 = x.offset_; |
| 705 | if (offset_8 < 0) { |
| 706 | offset_8 = -offset_8; |
| 707 | am ^= U; |
| 708 | } |
| 709 | if (!is_uint8(offset_8)) { |
| 710 | // immediate offset cannot be encoded, load it first to register ip |
| 711 | // rn (and rd in a load) should never be ip, or will be trashed |
| 712 | ASSERT(!x.rn_.is(ip) && ((instr & L) == L || !rd.is(ip))); |
| 713 | mov(ip, Operand(x.offset_), LeaveCC, |
| 714 | static_cast<Condition>(instr & CondMask)); |
| 715 | addrmod3(instr, rd, MemOperand(x.rn_, ip, x.am_)); |
| 716 | return; |
| 717 | } |
| 718 | ASSERT(offset_8 >= 0); // no masking needed |
| 719 | instr |= B | (offset_8 >> 4)*B8 | (offset_8 & 0xf); |
| 720 | } else if (x.shift_imm_ != 0) { |
| 721 | // scaled register offset not supported, load index first |
| 722 | // rn (and rd in a load) should never be ip, or will be trashed |
| 723 | ASSERT(!x.rn_.is(ip) && ((instr & L) == L || !rd.is(ip))); |
| 724 | mov(ip, Operand(x.rm_, x.shift_op_, x.shift_imm_), LeaveCC, |
| 725 | static_cast<Condition>(instr & CondMask)); |
| 726 | addrmod3(instr, rd, MemOperand(x.rn_, ip, x.am_)); |
| 727 | return; |
| 728 | } else { |
| 729 | // register offset |
| 730 | ASSERT((am & (P|W)) == P || !x.rm_.is(pc)); // no pc index with writeback |
| 731 | instr |= x.rm_.code(); |
| 732 | } |
| 733 | ASSERT((am & (P|W)) == P || !x.rn_.is(pc)); // no pc base with writeback |
| 734 | emit(instr | am | x.rn_.code()*B16 | rd.code()*B12); |
| 735 | } |
| 736 | |
| 737 | |
| 738 | void Assembler::addrmod4(Instr instr, Register rn, RegList rl) { |
| 739 | ASSERT((instr & ~(CondMask | P | U | W | L)) == B27); |
| 740 | ASSERT(rl != 0); |
| 741 | ASSERT(!rn.is(pc)); |
| 742 | emit(instr | rn.code()*B16 | rl); |
| 743 | } |
| 744 | |
| 745 | |
| 746 | void Assembler::addrmod5(Instr instr, CRegister crd, const MemOperand& x) { |
| 747 | // unindexed addressing is not encoded by this function |
| 748 | ASSERT_EQ((B27 | B26), |
| 749 | (instr & ~(CondMask | CoprocessorMask | P | U | N | W | L))); |
| 750 | ASSERT(x.rn_.is_valid() && !x.rm_.is_valid()); |
| 751 | int am = x.am_; |
| 752 | int offset_8 = x.offset_; |
| 753 | ASSERT((offset_8 & 3) == 0); // offset must be an aligned word offset |
| 754 | offset_8 >>= 2; |
| 755 | if (offset_8 < 0) { |
| 756 | offset_8 = -offset_8; |
| 757 | am ^= U; |
| 758 | } |
| 759 | ASSERT(is_uint8(offset_8)); // unsigned word offset must fit in a byte |
| 760 | ASSERT((am & (P|W)) == P || !x.rn_.is(pc)); // no pc base with writeback |
| 761 | |
| 762 | // post-indexed addressing requires W == 1; different than in addrmod2/3 |
| 763 | if ((am & P) == 0) |
| 764 | am |= W; |
| 765 | |
| 766 | ASSERT(offset_8 >= 0); // no masking needed |
| 767 | emit(instr | am | x.rn_.code()*B16 | crd.code()*B12 | offset_8); |
| 768 | } |
| 769 | |
| 770 | |
| 771 | int Assembler::branch_offset(Label* L, bool jump_elimination_allowed) { |
| 772 | int target_pos; |
| 773 | if (L->is_bound()) { |
| 774 | target_pos = L->pos(); |
| 775 | } else { |
| 776 | if (L->is_linked()) { |
| 777 | target_pos = L->pos(); // L's link |
| 778 | } else { |
| 779 | target_pos = kEndOfChain; |
| 780 | } |
| 781 | L->link_to(pc_offset()); |
| 782 | } |
| 783 | |
| 784 | // Block the emission of the constant pool, since the branch instruction must |
| 785 | // be emitted at the pc offset recorded by the label |
| 786 | BlockConstPoolBefore(pc_offset() + kInstrSize); |
| 787 | return target_pos - (pc_offset() + kPcLoadDelta); |
| 788 | } |
| 789 | |
| 790 | |
| 791 | void Assembler::label_at_put(Label* L, int at_offset) { |
| 792 | int target_pos; |
| 793 | if (L->is_bound()) { |
| 794 | target_pos = L->pos(); |
| 795 | } else { |
| 796 | if (L->is_linked()) { |
| 797 | target_pos = L->pos(); // L's link |
| 798 | } else { |
| 799 | target_pos = kEndOfChain; |
| 800 | } |
| 801 | L->link_to(at_offset); |
| 802 | instr_at_put(at_offset, target_pos + (Code::kHeaderSize - kHeapObjectTag)); |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | |
| 807 | // Branch instructions |
| 808 | void Assembler::b(int branch_offset, Condition cond) { |
| 809 | ASSERT((branch_offset & 3) == 0); |
| 810 | int imm24 = branch_offset >> 2; |
| 811 | ASSERT(is_int24(imm24)); |
| 812 | emit(cond | B27 | B25 | (imm24 & Imm24Mask)); |
| 813 | |
| 814 | if (cond == al) |
| 815 | // dead code is a good location to emit the constant pool |
| 816 | CheckConstPool(false, false); |
| 817 | } |
| 818 | |
| 819 | |
| 820 | void Assembler::bl(int branch_offset, Condition cond) { |
| 821 | ASSERT((branch_offset & 3) == 0); |
| 822 | int imm24 = branch_offset >> 2; |
| 823 | ASSERT(is_int24(imm24)); |
| 824 | emit(cond | B27 | B25 | B24 | (imm24 & Imm24Mask)); |
| 825 | } |
| 826 | |
| 827 | |
| 828 | void Assembler::blx(int branch_offset) { // v5 and above |
| 829 | WriteRecordedPositions(); |
| 830 | ASSERT((branch_offset & 1) == 0); |
| 831 | int h = ((branch_offset & 2) >> 1)*B24; |
| 832 | int imm24 = branch_offset >> 2; |
| 833 | ASSERT(is_int24(imm24)); |
| 834 | emit(15 << 28 | B27 | B25 | h | (imm24 & Imm24Mask)); |
| 835 | } |
| 836 | |
| 837 | |
| 838 | void Assembler::blx(Register target, Condition cond) { // v5 and above |
| 839 | WriteRecordedPositions(); |
| 840 | ASSERT(!target.is(pc)); |
| 841 | emit(cond | B24 | B21 | 15*B16 | 15*B12 | 15*B8 | 3*B4 | target.code()); |
| 842 | } |
| 843 | |
| 844 | |
| 845 | void Assembler::bx(Register target, Condition cond) { // v5 and above, plus v4t |
| 846 | WriteRecordedPositions(); |
| 847 | ASSERT(!target.is(pc)); // use of pc is actually allowed, but discouraged |
| 848 | emit(cond | B24 | B21 | 15*B16 | 15*B12 | 15*B8 | B4 | target.code()); |
| 849 | } |
| 850 | |
| 851 | |
| 852 | // Data-processing instructions |
| 853 | void Assembler::and_(Register dst, Register src1, const Operand& src2, |
| 854 | SBit s, Condition cond) { |
| 855 | addrmod1(cond | 0*B21 | s, src1, dst, src2); |
| 856 | } |
| 857 | |
| 858 | |
| 859 | void Assembler::eor(Register dst, Register src1, const Operand& src2, |
| 860 | SBit s, Condition cond) { |
| 861 | addrmod1(cond | 1*B21 | s, src1, dst, src2); |
| 862 | } |
| 863 | |
| 864 | |
| 865 | void Assembler::sub(Register dst, Register src1, const Operand& src2, |
| 866 | SBit s, Condition cond) { |
| 867 | addrmod1(cond | 2*B21 | s, src1, dst, src2); |
| 868 | } |
| 869 | |
| 870 | |
| 871 | void Assembler::rsb(Register dst, Register src1, const Operand& src2, |
| 872 | SBit s, Condition cond) { |
| 873 | addrmod1(cond | 3*B21 | s, src1, dst, src2); |
| 874 | } |
| 875 | |
| 876 | |
| 877 | void Assembler::add(Register dst, Register src1, const Operand& src2, |
| 878 | SBit s, Condition cond) { |
| 879 | addrmod1(cond | 4*B21 | s, src1, dst, src2); |
| 880 | |
| 881 | // Eliminate pattern: push(r), pop() |
| 882 | // str(src, MemOperand(sp, 4, NegPreIndex), al); |
| 883 | // add(sp, sp, Operand(kPointerSize)); |
| 884 | // Both instructions can be eliminated. |
| 885 | int pattern_size = 2 * kInstrSize; |
| 886 | if (FLAG_push_pop_elimination && |
| 887 | last_bound_pos_ <= (pc_offset() - pattern_size) && |
| 888 | reloc_info_writer.last_pc() <= (pc_ - pattern_size) && |
| 889 | // pattern |
| 890 | instr_at(pc_ - 1 * kInstrSize) == kPopInstruction && |
| 891 | (instr_at(pc_ - 2 * kInstrSize) & ~RdMask) == kPushRegPattern) { |
| 892 | pc_ -= 2 * kInstrSize; |
| 893 | if (FLAG_print_push_pop_elimination) { |
| 894 | PrintF("%x push(reg)/pop() eliminated\n", pc_offset()); |
| 895 | } |
| 896 | } |
| 897 | } |
| 898 | |
| 899 | |
| 900 | void Assembler::adc(Register dst, Register src1, const Operand& src2, |
| 901 | SBit s, Condition cond) { |
| 902 | addrmod1(cond | 5*B21 | s, src1, dst, src2); |
| 903 | } |
| 904 | |
| 905 | |
| 906 | void Assembler::sbc(Register dst, Register src1, const Operand& src2, |
| 907 | SBit s, Condition cond) { |
| 908 | addrmod1(cond | 6*B21 | s, src1, dst, src2); |
| 909 | } |
| 910 | |
| 911 | |
| 912 | void Assembler::rsc(Register dst, Register src1, const Operand& src2, |
| 913 | SBit s, Condition cond) { |
| 914 | addrmod1(cond | 7*B21 | s, src1, dst, src2); |
| 915 | } |
| 916 | |
| 917 | |
| 918 | void Assembler::tst(Register src1, const Operand& src2, Condition cond) { |
| 919 | addrmod1(cond | 8*B21 | S, src1, r0, src2); |
| 920 | } |
| 921 | |
| 922 | |
| 923 | void Assembler::teq(Register src1, const Operand& src2, Condition cond) { |
| 924 | addrmod1(cond | 9*B21 | S, src1, r0, src2); |
| 925 | } |
| 926 | |
| 927 | |
| 928 | void Assembler::cmp(Register src1, const Operand& src2, Condition cond) { |
| 929 | addrmod1(cond | 10*B21 | S, src1, r0, src2); |
| 930 | } |
| 931 | |
| 932 | |
| 933 | void Assembler::cmn(Register src1, const Operand& src2, Condition cond) { |
| 934 | addrmod1(cond | 11*B21 | S, src1, r0, src2); |
| 935 | } |
| 936 | |
| 937 | |
| 938 | void Assembler::orr(Register dst, Register src1, const Operand& src2, |
| 939 | SBit s, Condition cond) { |
| 940 | addrmod1(cond | 12*B21 | s, src1, dst, src2); |
| 941 | } |
| 942 | |
| 943 | |
| 944 | void Assembler::mov(Register dst, const Operand& src, SBit s, Condition cond) { |
| 945 | if (dst.is(pc)) { |
| 946 | WriteRecordedPositions(); |
| 947 | } |
| 948 | addrmod1(cond | 13*B21 | s, r0, dst, src); |
| 949 | } |
| 950 | |
| 951 | |
| 952 | void Assembler::bic(Register dst, Register src1, const Operand& src2, |
| 953 | SBit s, Condition cond) { |
| 954 | addrmod1(cond | 14*B21 | s, src1, dst, src2); |
| 955 | } |
| 956 | |
| 957 | |
| 958 | void Assembler::mvn(Register dst, const Operand& src, SBit s, Condition cond) { |
| 959 | addrmod1(cond | 15*B21 | s, r0, dst, src); |
| 960 | } |
| 961 | |
| 962 | |
| 963 | // Multiply instructions |
| 964 | void Assembler::mla(Register dst, Register src1, Register src2, Register srcA, |
| 965 | SBit s, Condition cond) { |
| 966 | ASSERT(!dst.is(pc) && !src1.is(pc) && !src2.is(pc) && !srcA.is(pc)); |
| 967 | emit(cond | A | s | dst.code()*B16 | srcA.code()*B12 | |
| 968 | src2.code()*B8 | B7 | B4 | src1.code()); |
| 969 | } |
| 970 | |
| 971 | |
| 972 | void Assembler::mul(Register dst, Register src1, Register src2, |
| 973 | SBit s, Condition cond) { |
| 974 | ASSERT(!dst.is(pc) && !src1.is(pc) && !src2.is(pc)); |
| 975 | // dst goes in bits 16-19 for this instruction! |
| 976 | emit(cond | s | dst.code()*B16 | src2.code()*B8 | B7 | B4 | src1.code()); |
| 977 | } |
| 978 | |
| 979 | |
| 980 | void Assembler::smlal(Register dstL, |
| 981 | Register dstH, |
| 982 | Register src1, |
| 983 | Register src2, |
| 984 | SBit s, |
| 985 | Condition cond) { |
| 986 | ASSERT(!dstL.is(pc) && !dstH.is(pc) && !src1.is(pc) && !src2.is(pc)); |
| 987 | ASSERT(!dstL.is(dstH)); |
| 988 | emit(cond | B23 | B22 | A | s | dstH.code()*B16 | dstL.code()*B12 | |
| 989 | src2.code()*B8 | B7 | B4 | src1.code()); |
| 990 | } |
| 991 | |
| 992 | |
| 993 | void Assembler::smull(Register dstL, |
| 994 | Register dstH, |
| 995 | Register src1, |
| 996 | Register src2, |
| 997 | SBit s, |
| 998 | Condition cond) { |
| 999 | ASSERT(!dstL.is(pc) && !dstH.is(pc) && !src1.is(pc) && !src2.is(pc)); |
| 1000 | ASSERT(!dstL.is(dstH)); |
| 1001 | emit(cond | B23 | B22 | s | dstH.code()*B16 | dstL.code()*B12 | |
| 1002 | src2.code()*B8 | B7 | B4 | src1.code()); |
| 1003 | } |
| 1004 | |
| 1005 | |
| 1006 | void Assembler::umlal(Register dstL, |
| 1007 | Register dstH, |
| 1008 | Register src1, |
| 1009 | Register src2, |
| 1010 | SBit s, |
| 1011 | Condition cond) { |
| 1012 | ASSERT(!dstL.is(pc) && !dstH.is(pc) && !src1.is(pc) && !src2.is(pc)); |
| 1013 | ASSERT(!dstL.is(dstH)); |
| 1014 | emit(cond | B23 | A | s | dstH.code()*B16 | dstL.code()*B12 | |
| 1015 | src2.code()*B8 | B7 | B4 | src1.code()); |
| 1016 | } |
| 1017 | |
| 1018 | |
| 1019 | void Assembler::umull(Register dstL, |
| 1020 | Register dstH, |
| 1021 | Register src1, |
| 1022 | Register src2, |
| 1023 | SBit s, |
| 1024 | Condition cond) { |
| 1025 | ASSERT(!dstL.is(pc) && !dstH.is(pc) && !src1.is(pc) && !src2.is(pc)); |
| 1026 | ASSERT(!dstL.is(dstH)); |
| 1027 | emit(cond | B23 | s | dstH.code()*B16 | dstL.code()*B12 | |
| 1028 | src2.code()*B8 | B7 | B4 | src1.code()); |
| 1029 | } |
| 1030 | |
| 1031 | |
| 1032 | // Miscellaneous arithmetic instructions |
| 1033 | void Assembler::clz(Register dst, Register src, Condition cond) { |
| 1034 | // v5 and above. |
| 1035 | ASSERT(!dst.is(pc) && !src.is(pc)); |
| 1036 | emit(cond | B24 | B22 | B21 | 15*B16 | dst.code()*B12 | |
| 1037 | 15*B8 | B4 | src.code()); |
| 1038 | } |
| 1039 | |
| 1040 | |
| 1041 | // Status register access instructions |
| 1042 | void Assembler::mrs(Register dst, SRegister s, Condition cond) { |
| 1043 | ASSERT(!dst.is(pc)); |
| 1044 | emit(cond | B24 | s | 15*B16 | dst.code()*B12); |
| 1045 | } |
| 1046 | |
| 1047 | |
| 1048 | void Assembler::msr(SRegisterFieldMask fields, const Operand& src, |
| 1049 | Condition cond) { |
| 1050 | ASSERT(fields >= B16 && fields < B20); // at least one field set |
| 1051 | Instr instr; |
| 1052 | if (!src.rm_.is_valid()) { |
| 1053 | // immediate |
| 1054 | uint32_t rotate_imm; |
| 1055 | uint32_t immed_8; |
| 1056 | if (MustUseIp(src.rmode_) || |
| 1057 | !fits_shifter(src.imm32_, &rotate_imm, &immed_8, NULL)) { |
| 1058 | // immediate operand cannot be encoded, load it first to register ip |
| 1059 | RecordRelocInfo(src.rmode_, src.imm32_); |
| 1060 | ldr(ip, MemOperand(pc, 0), cond); |
| 1061 | msr(fields, Operand(ip), cond); |
| 1062 | return; |
| 1063 | } |
| 1064 | instr = I | rotate_imm*B8 | immed_8; |
| 1065 | } else { |
| 1066 | ASSERT(!src.rs_.is_valid() && src.shift_imm_ == 0); // only rm allowed |
| 1067 | instr = src.rm_.code(); |
| 1068 | } |
| 1069 | emit(cond | instr | B24 | B21 | fields | 15*B12); |
| 1070 | } |
| 1071 | |
| 1072 | |
| 1073 | // Load/Store instructions |
| 1074 | void Assembler::ldr(Register dst, const MemOperand& src, Condition cond) { |
| 1075 | if (dst.is(pc)) { |
| 1076 | WriteRecordedPositions(); |
| 1077 | } |
| 1078 | addrmod2(cond | B26 | L, dst, src); |
| 1079 | |
| 1080 | // Eliminate pattern: push(r), pop(r) |
| 1081 | // str(r, MemOperand(sp, 4, NegPreIndex), al) |
| 1082 | // ldr(r, MemOperand(sp, 4, PostIndex), al) |
| 1083 | // Both instructions can be eliminated. |
| 1084 | int pattern_size = 2 * kInstrSize; |
| 1085 | if (FLAG_push_pop_elimination && |
| 1086 | last_bound_pos_ <= (pc_offset() - pattern_size) && |
| 1087 | reloc_info_writer.last_pc() <= (pc_ - pattern_size) && |
| 1088 | // pattern |
| 1089 | instr_at(pc_ - 1 * kInstrSize) == (kPopRegPattern | dst.code() * B12) && |
| 1090 | instr_at(pc_ - 2 * kInstrSize) == (kPushRegPattern | dst.code() * B12)) { |
| 1091 | pc_ -= 2 * kInstrSize; |
| 1092 | if (FLAG_print_push_pop_elimination) { |
| 1093 | PrintF("%x push/pop (same reg) eliminated\n", pc_offset()); |
| 1094 | } |
| 1095 | } |
| 1096 | } |
| 1097 | |
| 1098 | |
| 1099 | void Assembler::str(Register src, const MemOperand& dst, Condition cond) { |
| 1100 | addrmod2(cond | B26, src, dst); |
| 1101 | |
| 1102 | // Eliminate pattern: pop(), push(r) |
| 1103 | // add sp, sp, #4 LeaveCC, al; str r, [sp, #-4], al |
| 1104 | // -> str r, [sp, 0], al |
| 1105 | int pattern_size = 2 * kInstrSize; |
| 1106 | if (FLAG_push_pop_elimination && |
| 1107 | last_bound_pos_ <= (pc_offset() - pattern_size) && |
| 1108 | reloc_info_writer.last_pc() <= (pc_ - pattern_size) && |
| 1109 | instr_at(pc_ - 1 * kInstrSize) == (kPushRegPattern | src.code() * B12) && |
| 1110 | instr_at(pc_ - 2 * kInstrSize) == kPopInstruction) { |
| 1111 | pc_ -= 2 * kInstrSize; |
| 1112 | emit(al | B26 | 0 | Offset | sp.code() * B16 | src.code() * B12); |
| 1113 | if (FLAG_print_push_pop_elimination) { |
| 1114 | PrintF("%x pop()/push(reg) eliminated\n", pc_offset()); |
| 1115 | } |
| 1116 | } |
| 1117 | } |
| 1118 | |
| 1119 | |
| 1120 | void Assembler::ldrb(Register dst, const MemOperand& src, Condition cond) { |
| 1121 | addrmod2(cond | B26 | B | L, dst, src); |
| 1122 | } |
| 1123 | |
| 1124 | |
| 1125 | void Assembler::strb(Register src, const MemOperand& dst, Condition cond) { |
| 1126 | addrmod2(cond | B26 | B, src, dst); |
| 1127 | } |
| 1128 | |
| 1129 | |
| 1130 | void Assembler::ldrh(Register dst, const MemOperand& src, Condition cond) { |
| 1131 | addrmod3(cond | L | B7 | H | B4, dst, src); |
| 1132 | } |
| 1133 | |
| 1134 | |
| 1135 | void Assembler::strh(Register src, const MemOperand& dst, Condition cond) { |
| 1136 | addrmod3(cond | B7 | H | B4, src, dst); |
| 1137 | } |
| 1138 | |
| 1139 | |
| 1140 | void Assembler::ldrsb(Register dst, const MemOperand& src, Condition cond) { |
| 1141 | addrmod3(cond | L | B7 | S6 | B4, dst, src); |
| 1142 | } |
| 1143 | |
| 1144 | |
| 1145 | void Assembler::ldrsh(Register dst, const MemOperand& src, Condition cond) { |
| 1146 | addrmod3(cond | L | B7 | S6 | H | B4, dst, src); |
| 1147 | } |
| 1148 | |
| 1149 | |
| 1150 | // Load/Store multiple instructions |
| 1151 | void Assembler::ldm(BlockAddrMode am, |
| 1152 | Register base, |
| 1153 | RegList dst, |
| 1154 | Condition cond) { |
| 1155 | // ABI stack constraint: ldmxx base, {..sp..} base != sp is not restartable |
| 1156 | ASSERT(base.is(sp) || (dst & sp.bit()) == 0); |
| 1157 | |
| 1158 | addrmod4(cond | B27 | am | L, base, dst); |
| 1159 | |
| 1160 | // emit the constant pool after a function return implemented by ldm ..{..pc} |
| 1161 | if (cond == al && (dst & pc.bit()) != 0) { |
| 1162 | // There is a slight chance that the ldm instruction was actually a call, |
| 1163 | // in which case it would be wrong to return into the constant pool; we |
| 1164 | // recognize this case by checking if the emission of the pool was blocked |
| 1165 | // at the pc of the ldm instruction by a mov lr, pc instruction; if this is |
| 1166 | // the case, we emit a jump over the pool. |
| 1167 | CheckConstPool(true, no_const_pool_before_ == pc_offset() - kInstrSize); |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | |
| 1172 | void Assembler::stm(BlockAddrMode am, |
| 1173 | Register base, |
| 1174 | RegList src, |
| 1175 | Condition cond) { |
| 1176 | addrmod4(cond | B27 | am, base, src); |
| 1177 | } |
| 1178 | |
| 1179 | |
| 1180 | // Semaphore instructions |
| 1181 | void Assembler::swp(Register dst, Register src, Register base, Condition cond) { |
| 1182 | ASSERT(!dst.is(pc) && !src.is(pc) && !base.is(pc)); |
| 1183 | ASSERT(!dst.is(base) && !src.is(base)); |
| 1184 | emit(cond | P | base.code()*B16 | dst.code()*B12 | |
| 1185 | B7 | B4 | src.code()); |
| 1186 | } |
| 1187 | |
| 1188 | |
| 1189 | void Assembler::swpb(Register dst, |
| 1190 | Register src, |
| 1191 | Register base, |
| 1192 | Condition cond) { |
| 1193 | ASSERT(!dst.is(pc) && !src.is(pc) && !base.is(pc)); |
| 1194 | ASSERT(!dst.is(base) && !src.is(base)); |
| 1195 | emit(cond | P | B | base.code()*B16 | dst.code()*B12 | |
| 1196 | B7 | B4 | src.code()); |
| 1197 | } |
| 1198 | |
| 1199 | |
| 1200 | // Exception-generating instructions and debugging support |
| 1201 | void Assembler::stop(const char* msg) { |
| 1202 | #if !defined(__arm__) |
| 1203 | // The simulator handles these special instructions and stops execution. |
| 1204 | emit(15 << 28 | ((intptr_t) msg)); |
| 1205 | #else |
| 1206 | // Just issue a simple break instruction for now. Alternatively we could use |
| 1207 | // the swi(0x9f0001) instruction on Linux. |
| 1208 | bkpt(0); |
| 1209 | #endif |
| 1210 | } |
| 1211 | |
| 1212 | |
| 1213 | void Assembler::bkpt(uint32_t imm16) { // v5 and above |
| 1214 | ASSERT(is_uint16(imm16)); |
| 1215 | emit(al | B24 | B21 | (imm16 >> 4)*B8 | 7*B4 | (imm16 & 0xf)); |
| 1216 | } |
| 1217 | |
| 1218 | |
| 1219 | void Assembler::swi(uint32_t imm24, Condition cond) { |
| 1220 | ASSERT(is_uint24(imm24)); |
| 1221 | emit(cond | 15*B24 | imm24); |
| 1222 | } |
| 1223 | |
| 1224 | |
| 1225 | // Coprocessor instructions |
| 1226 | void Assembler::cdp(Coprocessor coproc, |
| 1227 | int opcode_1, |
| 1228 | CRegister crd, |
| 1229 | CRegister crn, |
| 1230 | CRegister crm, |
| 1231 | int opcode_2, |
| 1232 | Condition cond) { |
| 1233 | ASSERT(is_uint4(opcode_1) && is_uint3(opcode_2)); |
| 1234 | emit(cond | B27 | B26 | B25 | (opcode_1 & 15)*B20 | crn.code()*B16 | |
| 1235 | crd.code()*B12 | coproc*B8 | (opcode_2 & 7)*B5 | crm.code()); |
| 1236 | } |
| 1237 | |
| 1238 | |
| 1239 | void Assembler::cdp2(Coprocessor coproc, |
| 1240 | int opcode_1, |
| 1241 | CRegister crd, |
| 1242 | CRegister crn, |
| 1243 | CRegister crm, |
| 1244 | int opcode_2) { // v5 and above |
| 1245 | cdp(coproc, opcode_1, crd, crn, crm, opcode_2, static_cast<Condition>(nv)); |
| 1246 | } |
| 1247 | |
| 1248 | |
| 1249 | void Assembler::mcr(Coprocessor coproc, |
| 1250 | int opcode_1, |
| 1251 | Register rd, |
| 1252 | CRegister crn, |
| 1253 | CRegister crm, |
| 1254 | int opcode_2, |
| 1255 | Condition cond) { |
| 1256 | ASSERT(is_uint3(opcode_1) && is_uint3(opcode_2)); |
| 1257 | emit(cond | B27 | B26 | B25 | (opcode_1 & 7)*B21 | crn.code()*B16 | |
| 1258 | rd.code()*B12 | coproc*B8 | (opcode_2 & 7)*B5 | B4 | crm.code()); |
| 1259 | } |
| 1260 | |
| 1261 | |
| 1262 | void Assembler::mcr2(Coprocessor coproc, |
| 1263 | int opcode_1, |
| 1264 | Register rd, |
| 1265 | CRegister crn, |
| 1266 | CRegister crm, |
| 1267 | int opcode_2) { // v5 and above |
| 1268 | mcr(coproc, opcode_1, rd, crn, crm, opcode_2, static_cast<Condition>(nv)); |
| 1269 | } |
| 1270 | |
| 1271 | |
| 1272 | void Assembler::mrc(Coprocessor coproc, |
| 1273 | int opcode_1, |
| 1274 | Register rd, |
| 1275 | CRegister crn, |
| 1276 | CRegister crm, |
| 1277 | int opcode_2, |
| 1278 | Condition cond) { |
| 1279 | ASSERT(is_uint3(opcode_1) && is_uint3(opcode_2)); |
| 1280 | emit(cond | B27 | B26 | B25 | (opcode_1 & 7)*B21 | L | crn.code()*B16 | |
| 1281 | rd.code()*B12 | coproc*B8 | (opcode_2 & 7)*B5 | B4 | crm.code()); |
| 1282 | } |
| 1283 | |
| 1284 | |
| 1285 | void Assembler::mrc2(Coprocessor coproc, |
| 1286 | int opcode_1, |
| 1287 | Register rd, |
| 1288 | CRegister crn, |
| 1289 | CRegister crm, |
| 1290 | int opcode_2) { // v5 and above |
| 1291 | mrc(coproc, opcode_1, rd, crn, crm, opcode_2, static_cast<Condition>(nv)); |
| 1292 | } |
| 1293 | |
| 1294 | |
| 1295 | void Assembler::ldc(Coprocessor coproc, |
| 1296 | CRegister crd, |
| 1297 | const MemOperand& src, |
| 1298 | LFlag l, |
| 1299 | Condition cond) { |
| 1300 | addrmod5(cond | B27 | B26 | l | L | coproc*B8, crd, src); |
| 1301 | } |
| 1302 | |
| 1303 | |
| 1304 | void Assembler::ldc(Coprocessor coproc, |
| 1305 | CRegister crd, |
| 1306 | Register rn, |
| 1307 | int option, |
| 1308 | LFlag l, |
| 1309 | Condition cond) { |
| 1310 | // unindexed addressing |
| 1311 | ASSERT(is_uint8(option)); |
| 1312 | emit(cond | B27 | B26 | U | l | L | rn.code()*B16 | crd.code()*B12 | |
| 1313 | coproc*B8 | (option & 255)); |
| 1314 | } |
| 1315 | |
| 1316 | |
| 1317 | void Assembler::ldc2(Coprocessor coproc, |
| 1318 | CRegister crd, |
| 1319 | const MemOperand& src, |
| 1320 | LFlag l) { // v5 and above |
| 1321 | ldc(coproc, crd, src, l, static_cast<Condition>(nv)); |
| 1322 | } |
| 1323 | |
| 1324 | |
| 1325 | void Assembler::ldc2(Coprocessor coproc, |
| 1326 | CRegister crd, |
| 1327 | Register rn, |
| 1328 | int option, |
| 1329 | LFlag l) { // v5 and above |
| 1330 | ldc(coproc, crd, rn, option, l, static_cast<Condition>(nv)); |
| 1331 | } |
| 1332 | |
| 1333 | |
| 1334 | void Assembler::stc(Coprocessor coproc, |
| 1335 | CRegister crd, |
| 1336 | const MemOperand& dst, |
| 1337 | LFlag l, |
| 1338 | Condition cond) { |
| 1339 | addrmod5(cond | B27 | B26 | l | coproc*B8, crd, dst); |
| 1340 | } |
| 1341 | |
| 1342 | |
| 1343 | void Assembler::stc(Coprocessor coproc, |
| 1344 | CRegister crd, |
| 1345 | Register rn, |
| 1346 | int option, |
| 1347 | LFlag l, |
| 1348 | Condition cond) { |
| 1349 | // unindexed addressing |
| 1350 | ASSERT(is_uint8(option)); |
| 1351 | emit(cond | B27 | B26 | U | l | rn.code()*B16 | crd.code()*B12 | |
| 1352 | coproc*B8 | (option & 255)); |
| 1353 | } |
| 1354 | |
| 1355 | |
| 1356 | void Assembler::stc2(Coprocessor |
| 1357 | coproc, CRegister crd, |
| 1358 | const MemOperand& dst, |
| 1359 | LFlag l) { // v5 and above |
| 1360 | stc(coproc, crd, dst, l, static_cast<Condition>(nv)); |
| 1361 | } |
| 1362 | |
| 1363 | |
| 1364 | void Assembler::stc2(Coprocessor coproc, |
| 1365 | CRegister crd, |
| 1366 | Register rn, |
| 1367 | int option, |
| 1368 | LFlag l) { // v5 and above |
| 1369 | stc(coproc, crd, rn, option, l, static_cast<Condition>(nv)); |
| 1370 | } |
| 1371 | |
| 1372 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1373 | // Support for VFP. |
Leon Clarke | d91b9f7 | 2010-01-27 17:25:45 +0000 | [diff] [blame] | 1374 | void Assembler::vldr(const DwVfpRegister dst, |
| 1375 | const Register base, |
| 1376 | int offset, |
| 1377 | const Condition cond) { |
| 1378 | // Ddst = MEM(Rbase + offset). |
| 1379 | // Instruction details available in ARM DDI 0406A, A8-628. |
| 1380 | // cond(31-28) | 1101(27-24)| 1001(23-20) | Rbase(19-16) | |
| 1381 | // Vdst(15-12) | 1011(11-8) | offset |
| 1382 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1383 | ASSERT(offset % 4 == 0); |
| 1384 | emit(cond | 0xD9*B20 | base.code()*B16 | dst.code()*B12 | |
| 1385 | 0xB*B8 | ((offset / 4) & 255)); |
| 1386 | } |
| 1387 | |
| 1388 | |
| 1389 | void Assembler::vstr(const DwVfpRegister src, |
| 1390 | const Register base, |
| 1391 | int offset, |
| 1392 | const Condition cond) { |
| 1393 | // MEM(Rbase + offset) = Dsrc. |
| 1394 | // Instruction details available in ARM DDI 0406A, A8-786. |
| 1395 | // cond(31-28) | 1101(27-24)| 1000(23-20) | | Rbase(19-16) | |
| 1396 | // Vsrc(15-12) | 1011(11-8) | (offset/4) |
| 1397 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1398 | ASSERT(offset % 4 == 0); |
| 1399 | emit(cond | 0xD8*B20 | base.code()*B16 | src.code()*B12 | |
| 1400 | 0xB*B8 | ((offset / 4) & 255)); |
| 1401 | } |
| 1402 | |
| 1403 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1404 | void Assembler::vmov(const DwVfpRegister dst, |
| 1405 | const Register src1, |
| 1406 | const Register src2, |
| 1407 | const Condition cond) { |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1408 | // Dm = <Rt,Rt2>. |
| 1409 | // Instruction details available in ARM DDI 0406A, A8-646. |
| 1410 | // cond(31-28) | 1100(27-24)| 010(23-21) | op=0(20) | Rt2(19-16) | |
| 1411 | // Rt(15-12) | 1011(11-8) | 00(7-6) | M(5) | 1(4) | Vm |
| 1412 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1413 | ASSERT(!src1.is(pc) && !src2.is(pc)); |
| 1414 | emit(cond | 0xC*B24 | B22 | src2.code()*B16 | |
| 1415 | src1.code()*B12 | 0xB*B8 | B4 | dst.code()); |
| 1416 | } |
| 1417 | |
| 1418 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1419 | void Assembler::vmov(const Register dst1, |
| 1420 | const Register dst2, |
| 1421 | const DwVfpRegister src, |
| 1422 | const Condition cond) { |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1423 | // <Rt,Rt2> = Dm. |
| 1424 | // Instruction details available in ARM DDI 0406A, A8-646. |
| 1425 | // cond(31-28) | 1100(27-24)| 010(23-21) | op=1(20) | Rt2(19-16) | |
| 1426 | // Rt(15-12) | 1011(11-8) | 00(7-6) | M(5) | 1(4) | Vm |
| 1427 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1428 | ASSERT(!dst1.is(pc) && !dst2.is(pc)); |
| 1429 | emit(cond | 0xC*B24 | B22 | B20 | dst2.code()*B16 | |
| 1430 | dst1.code()*B12 | 0xB*B8 | B4 | src.code()); |
| 1431 | } |
| 1432 | |
| 1433 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1434 | void Assembler::vmov(const SwVfpRegister dst, |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1435 | const Register src, |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1436 | const Condition cond) { |
| 1437 | // Sn = Rt. |
| 1438 | // Instruction details available in ARM DDI 0406A, A8-642. |
| 1439 | // cond(31-28) | 1110(27-24)| 000(23-21) | op=0(20) | Vn(19-16) | |
| 1440 | // Rt(15-12) | 1010(11-8) | N(7)=0 | 00(6-5) | 1(4) | 0000(3-0) |
| 1441 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1442 | ASSERT(!src.is(pc)); |
| 1443 | emit(cond | 0xE*B24 | (dst.code() >> 1)*B16 | |
| 1444 | src.code()*B12 | 0xA*B8 | (0x1 & dst.code())*B7 | B4); |
| 1445 | } |
| 1446 | |
| 1447 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1448 | void Assembler::vmov(const Register dst, |
| 1449 | const SwVfpRegister src, |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1450 | const Condition cond) { |
| 1451 | // Rt = Sn. |
| 1452 | // Instruction details available in ARM DDI 0406A, A8-642. |
| 1453 | // cond(31-28) | 1110(27-24)| 000(23-21) | op=1(20) | Vn(19-16) | |
| 1454 | // Rt(15-12) | 1010(11-8) | N(7)=0 | 00(6-5) | 1(4) | 0000(3-0) |
| 1455 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1456 | ASSERT(!dst.is(pc)); |
| 1457 | emit(cond | 0xE*B24 | B20 | (src.code() >> 1)*B16 | |
| 1458 | dst.code()*B12 | 0xA*B8 | (0x1 & src.code())*B7 | B4); |
| 1459 | } |
| 1460 | |
| 1461 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1462 | void Assembler::vcvt(const DwVfpRegister dst, |
| 1463 | const SwVfpRegister src, |
| 1464 | const Condition cond) { |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1465 | // Dd = Sm (integer in Sm converted to IEEE 64-bit doubles in Dd). |
| 1466 | // Instruction details available in ARM DDI 0406A, A8-576. |
| 1467 | // cond(31-28) | 11101(27-23)| D=?(22) | 11(21-20) | 1(19) |opc2=000(18-16) | |
| 1468 | // Vd(15-12) | 101(11-9) | sz(8)=1 | op(7)=1 | 1(6) | M=?(5) | 0(4) | Vm(3-0) |
| 1469 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1470 | emit(cond | 0xE*B24 | B23 | 0x3*B20 | B19 | |
| 1471 | dst.code()*B12 | 0x5*B9 | B8 | B7 | B6 | |
| 1472 | (0x1 & src.code())*B5 | (src.code() >> 1)); |
| 1473 | } |
| 1474 | |
| 1475 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1476 | void Assembler::vcvt(const SwVfpRegister dst, |
| 1477 | const DwVfpRegister src, |
| 1478 | const Condition cond) { |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1479 | // Sd = Dm (IEEE 64-bit doubles in Dm converted to 32 bit integer in Sd). |
| 1480 | // Instruction details available in ARM DDI 0406A, A8-576. |
| 1481 | // cond(31-28) | 11101(27-23)| D=?(22) | 11(21-20) | 1(19) | opc2=101(18-16)| |
| 1482 | // Vd(15-12) | 101(11-9) | sz(8)=1 | op(7)=? | 1(6) | M=?(5) | 0(4) | Vm(3-0) |
| 1483 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1484 | emit(cond | 0xE*B24 | B23 |(0x1 & dst.code())*B22 | |
| 1485 | 0x3*B20 | B19 | 0x5*B16 | (dst.code() >> 1)*B12 | |
| 1486 | 0x5*B9 | B8 | B7 | B6 | src.code()); |
| 1487 | } |
| 1488 | |
| 1489 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1490 | void Assembler::vadd(const DwVfpRegister dst, |
| 1491 | const DwVfpRegister src1, |
| 1492 | const DwVfpRegister src2, |
| 1493 | const Condition cond) { |
| 1494 | // Dd = vadd(Dn, Dm) double precision floating point addition. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1495 | // Dd = D:Vd; Dm=M:Vm; Dn=N:Vm. |
| 1496 | // Instruction details available in ARM DDI 0406A, A8-536. |
| 1497 | // cond(31-28) | 11100(27-23)| D=?(22) | 11(21-20) | Vn(19-16) | |
| 1498 | // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=0 | 0(6) | M=?(5) | 0(4) | Vm(3-0) |
| 1499 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1500 | emit(cond | 0xE*B24 | 0x3*B20 | src1.code()*B16 | |
| 1501 | dst.code()*B12 | 0x5*B9 | B8 | src2.code()); |
| 1502 | } |
| 1503 | |
| 1504 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1505 | void Assembler::vsub(const DwVfpRegister dst, |
| 1506 | const DwVfpRegister src1, |
| 1507 | const DwVfpRegister src2, |
| 1508 | const Condition cond) { |
| 1509 | // Dd = vsub(Dn, Dm) double precision floating point subtraction. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1510 | // Dd = D:Vd; Dm=M:Vm; Dn=N:Vm. |
| 1511 | // Instruction details available in ARM DDI 0406A, A8-784. |
| 1512 | // cond(31-28) | 11100(27-23)| D=?(22) | 11(21-20) | Vn(19-16) | |
| 1513 | // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=0 | 1(6) | M=?(5) | 0(4) | Vm(3-0) |
| 1514 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1515 | emit(cond | 0xE*B24 | 0x3*B20 | src1.code()*B16 | |
| 1516 | dst.code()*B12 | 0x5*B9 | B8 | B6 | src2.code()); |
| 1517 | } |
| 1518 | |
| 1519 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1520 | void Assembler::vmul(const DwVfpRegister dst, |
| 1521 | const DwVfpRegister src1, |
| 1522 | const DwVfpRegister src2, |
| 1523 | const Condition cond) { |
| 1524 | // Dd = vmul(Dn, Dm) double precision floating point multiplication. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1525 | // Dd = D:Vd; Dm=M:Vm; Dn=N:Vm. |
| 1526 | // Instruction details available in ARM DDI 0406A, A8-784. |
| 1527 | // cond(31-28) | 11100(27-23)| D=?(22) | 10(21-20) | Vn(19-16) | |
| 1528 | // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=0 | 0(6) | M=?(5) | 0(4) | Vm(3-0) |
| 1529 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1530 | emit(cond | 0xE*B24 | 0x2*B20 | src1.code()*B16 | |
| 1531 | dst.code()*B12 | 0x5*B9 | B8 | src2.code()); |
| 1532 | } |
| 1533 | |
| 1534 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1535 | void Assembler::vdiv(const DwVfpRegister dst, |
| 1536 | const DwVfpRegister src1, |
| 1537 | const DwVfpRegister src2, |
| 1538 | const Condition cond) { |
| 1539 | // Dd = vdiv(Dn, Dm) double precision floating point division. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1540 | // Dd = D:Vd; Dm=M:Vm; Dn=N:Vm. |
| 1541 | // Instruction details available in ARM DDI 0406A, A8-584. |
| 1542 | // cond(31-28) | 11101(27-23)| D=?(22) | 00(21-20) | Vn(19-16) | |
| 1543 | // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=? | 0(6) | M=?(5) | 0(4) | Vm(3-0) |
| 1544 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1545 | emit(cond | 0xE*B24 | B23 | src1.code()*B16 | |
| 1546 | dst.code()*B12 | 0x5*B9 | B8 | src2.code()); |
| 1547 | } |
| 1548 | |
| 1549 | |
Leon Clarke | e46be81 | 2010-01-19 14:06:41 +0000 | [diff] [blame] | 1550 | void Assembler::vcmp(const DwVfpRegister src1, |
| 1551 | const DwVfpRegister src2, |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1552 | const SBit s, |
| 1553 | const Condition cond) { |
| 1554 | // vcmp(Dd, Dm) double precision floating point comparison. |
| 1555 | // Instruction details available in ARM DDI 0406A, A8-570. |
| 1556 | // cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0100 (19-16) | |
| 1557 | // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=? | 1(6) | M(5)=? | 0(4) | Vm(3-0) |
| 1558 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1559 | emit(cond | 0xE*B24 |B23 | 0x3*B20 | B18 | |
| 1560 | src1.code()*B12 | 0x5*B9 | B8 | B6 | src2.code()); |
| 1561 | } |
| 1562 | |
| 1563 | |
| 1564 | void Assembler::vmrs(Register dst, Condition cond) { |
| 1565 | // Instruction details available in ARM DDI 0406A, A8-652. |
| 1566 | // cond(31-28) | 1110 (27-24) | 1111(23-20)| 0001 (19-16) | |
| 1567 | // Rt(15-12) | 1010 (11-8) | 0(7) | 00 (6-5) | 1(4) | 0000(3-0) |
| 1568 | ASSERT(CpuFeatures::IsEnabled(VFP3)); |
| 1569 | emit(cond | 0xE*B24 | 0xF*B20 | B16 | |
| 1570 | dst.code()*B12 | 0xA*B8 | B4); |
| 1571 | } |
| 1572 | |
| 1573 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1574 | // Pseudo instructions |
| 1575 | void Assembler::lea(Register dst, |
| 1576 | const MemOperand& x, |
| 1577 | SBit s, |
| 1578 | Condition cond) { |
| 1579 | int am = x.am_; |
| 1580 | if (!x.rm_.is_valid()) { |
| 1581 | // immediate offset |
| 1582 | if ((am & P) == 0) // post indexing |
| 1583 | mov(dst, Operand(x.rn_), s, cond); |
| 1584 | else if ((am & U) == 0) // negative indexing |
| 1585 | sub(dst, x.rn_, Operand(x.offset_), s, cond); |
| 1586 | else |
| 1587 | add(dst, x.rn_, Operand(x.offset_), s, cond); |
| 1588 | } else { |
| 1589 | // Register offset (shift_imm_ and shift_op_ are 0) or scaled |
| 1590 | // register offset the constructors make sure than both shift_imm_ |
| 1591 | // and shift_op_ are initialized. |
| 1592 | ASSERT(!x.rm_.is(pc)); |
| 1593 | if ((am & P) == 0) // post indexing |
| 1594 | mov(dst, Operand(x.rn_), s, cond); |
| 1595 | else if ((am & U) == 0) // negative indexing |
| 1596 | sub(dst, x.rn_, Operand(x.rm_, x.shift_op_, x.shift_imm_), s, cond); |
| 1597 | else |
| 1598 | add(dst, x.rn_, Operand(x.rm_, x.shift_op_, x.shift_imm_), s, cond); |
| 1599 | } |
| 1600 | } |
| 1601 | |
| 1602 | |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1603 | bool Assembler::ImmediateFitsAddrMode1Instruction(int32_t imm32) { |
| 1604 | uint32_t dummy1; |
| 1605 | uint32_t dummy2; |
| 1606 | return fits_shifter(imm32, &dummy1, &dummy2, NULL); |
| 1607 | } |
| 1608 | |
| 1609 | |
| 1610 | void Assembler::BlockConstPoolFor(int instructions) { |
| 1611 | BlockConstPoolBefore(pc_offset() + instructions * kInstrSize); |
| 1612 | } |
| 1613 | |
| 1614 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1615 | // Debugging |
| 1616 | void Assembler::RecordJSReturn() { |
| 1617 | WriteRecordedPositions(); |
| 1618 | CheckBuffer(); |
| 1619 | RecordRelocInfo(RelocInfo::JS_RETURN); |
| 1620 | } |
| 1621 | |
| 1622 | |
| 1623 | void Assembler::RecordComment(const char* msg) { |
| 1624 | if (FLAG_debug_code) { |
| 1625 | CheckBuffer(); |
| 1626 | RecordRelocInfo(RelocInfo::COMMENT, reinterpret_cast<intptr_t>(msg)); |
| 1627 | } |
| 1628 | } |
| 1629 | |
| 1630 | |
| 1631 | void Assembler::RecordPosition(int pos) { |
| 1632 | if (pos == RelocInfo::kNoPosition) return; |
| 1633 | ASSERT(pos >= 0); |
| 1634 | current_position_ = pos; |
| 1635 | } |
| 1636 | |
| 1637 | |
| 1638 | void Assembler::RecordStatementPosition(int pos) { |
| 1639 | if (pos == RelocInfo::kNoPosition) return; |
| 1640 | ASSERT(pos >= 0); |
| 1641 | current_statement_position_ = pos; |
| 1642 | } |
| 1643 | |
| 1644 | |
| 1645 | void Assembler::WriteRecordedPositions() { |
| 1646 | // Write the statement position if it is different from what was written last |
| 1647 | // time. |
| 1648 | if (current_statement_position_ != written_statement_position_) { |
| 1649 | CheckBuffer(); |
| 1650 | RecordRelocInfo(RelocInfo::STATEMENT_POSITION, current_statement_position_); |
| 1651 | written_statement_position_ = current_statement_position_; |
| 1652 | } |
| 1653 | |
| 1654 | // Write the position if it is different from what was written last time and |
| 1655 | // also different from the written statement position. |
| 1656 | if (current_position_ != written_position_ && |
| 1657 | current_position_ != written_statement_position_) { |
| 1658 | CheckBuffer(); |
| 1659 | RecordRelocInfo(RelocInfo::POSITION, current_position_); |
| 1660 | written_position_ = current_position_; |
| 1661 | } |
| 1662 | } |
| 1663 | |
| 1664 | |
| 1665 | void Assembler::GrowBuffer() { |
| 1666 | if (!own_buffer_) FATAL("external code buffer is too small"); |
| 1667 | |
| 1668 | // compute new buffer size |
| 1669 | CodeDesc desc; // the new buffer |
| 1670 | if (buffer_size_ < 4*KB) { |
| 1671 | desc.buffer_size = 4*KB; |
| 1672 | } else if (buffer_size_ < 1*MB) { |
| 1673 | desc.buffer_size = 2*buffer_size_; |
| 1674 | } else { |
| 1675 | desc.buffer_size = buffer_size_ + 1*MB; |
| 1676 | } |
| 1677 | CHECK_GT(desc.buffer_size, 0); // no overflow |
| 1678 | |
| 1679 | // setup new buffer |
| 1680 | desc.buffer = NewArray<byte>(desc.buffer_size); |
| 1681 | |
| 1682 | desc.instr_size = pc_offset(); |
| 1683 | desc.reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos(); |
| 1684 | |
| 1685 | // copy the data |
| 1686 | int pc_delta = desc.buffer - buffer_; |
| 1687 | int rc_delta = (desc.buffer + desc.buffer_size) - (buffer_ + buffer_size_); |
| 1688 | memmove(desc.buffer, buffer_, desc.instr_size); |
| 1689 | memmove(reloc_info_writer.pos() + rc_delta, |
| 1690 | reloc_info_writer.pos(), desc.reloc_size); |
| 1691 | |
| 1692 | // switch buffers |
| 1693 | DeleteArray(buffer_); |
| 1694 | buffer_ = desc.buffer; |
| 1695 | buffer_size_ = desc.buffer_size; |
| 1696 | pc_ += pc_delta; |
| 1697 | reloc_info_writer.Reposition(reloc_info_writer.pos() + rc_delta, |
| 1698 | reloc_info_writer.last_pc() + pc_delta); |
| 1699 | |
| 1700 | // none of our relocation types are pc relative pointing outside the code |
| 1701 | // buffer nor pc absolute pointing inside the code buffer, so there is no need |
| 1702 | // to relocate any emitted relocation entries |
| 1703 | |
| 1704 | // relocate pending relocation entries |
| 1705 | for (int i = 0; i < num_prinfo_; i++) { |
| 1706 | RelocInfo& rinfo = prinfo_[i]; |
| 1707 | ASSERT(rinfo.rmode() != RelocInfo::COMMENT && |
| 1708 | rinfo.rmode() != RelocInfo::POSITION); |
| 1709 | if (rinfo.rmode() != RelocInfo::JS_RETURN) { |
| 1710 | rinfo.set_pc(rinfo.pc() + pc_delta); |
| 1711 | } |
| 1712 | } |
| 1713 | } |
| 1714 | |
| 1715 | |
| 1716 | void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) { |
| 1717 | RelocInfo rinfo(pc_, rmode, data); // we do not try to reuse pool constants |
| 1718 | if (rmode >= RelocInfo::JS_RETURN && rmode <= RelocInfo::STATEMENT_POSITION) { |
| 1719 | // Adjust code for new modes |
| 1720 | ASSERT(RelocInfo::IsJSReturn(rmode) |
| 1721 | || RelocInfo::IsComment(rmode) |
| 1722 | || RelocInfo::IsPosition(rmode)); |
| 1723 | // these modes do not need an entry in the constant pool |
| 1724 | } else { |
| 1725 | ASSERT(num_prinfo_ < kMaxNumPRInfo); |
| 1726 | prinfo_[num_prinfo_++] = rinfo; |
| 1727 | // Make sure the constant pool is not emitted in place of the next |
| 1728 | // instruction for which we just recorded relocation info |
| 1729 | BlockConstPoolBefore(pc_offset() + kInstrSize); |
| 1730 | } |
| 1731 | if (rinfo.rmode() != RelocInfo::NONE) { |
| 1732 | // Don't record external references unless the heap will be serialized. |
Steve Block | d0582a6 | 2009-12-15 09:54:21 +0000 | [diff] [blame] | 1733 | if (rmode == RelocInfo::EXTERNAL_REFERENCE) { |
| 1734 | #ifdef DEBUG |
| 1735 | if (!Serializer::enabled()) { |
| 1736 | Serializer::TooLateToEnableNow(); |
| 1737 | } |
| 1738 | #endif |
| 1739 | if (!Serializer::enabled() && !FLAG_debug_code) { |
| 1740 | return; |
| 1741 | } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1742 | } |
| 1743 | ASSERT(buffer_space() >= kMaxRelocSize); // too late to grow buffer here |
| 1744 | reloc_info_writer.Write(&rinfo); |
| 1745 | } |
| 1746 | } |
| 1747 | |
| 1748 | |
| 1749 | void Assembler::CheckConstPool(bool force_emit, bool require_jump) { |
| 1750 | // Calculate the offset of the next check. It will be overwritten |
| 1751 | // when a const pool is generated or when const pools are being |
| 1752 | // blocked for a specific range. |
| 1753 | next_buffer_check_ = pc_offset() + kCheckConstInterval; |
| 1754 | |
| 1755 | // There is nothing to do if there are no pending relocation info entries |
| 1756 | if (num_prinfo_ == 0) return; |
| 1757 | |
| 1758 | // We emit a constant pool at regular intervals of about kDistBetweenPools |
| 1759 | // or when requested by parameter force_emit (e.g. after each function). |
| 1760 | // We prefer not to emit a jump unless the max distance is reached or if we |
| 1761 | // are running low on slots, which can happen if a lot of constants are being |
| 1762 | // emitted (e.g. --debug-code and many static references). |
| 1763 | int dist = pc_offset() - last_const_pool_end_; |
| 1764 | if (!force_emit && dist < kMaxDistBetweenPools && |
| 1765 | (require_jump || dist < kDistBetweenPools) && |
| 1766 | // TODO(1236125): Cleanup the "magic" number below. We know that |
| 1767 | // the code generation will test every kCheckConstIntervalInst. |
| 1768 | // Thus we are safe as long as we generate less than 7 constant |
| 1769 | // entries per instruction. |
| 1770 | (num_prinfo_ < (kMaxNumPRInfo - (7 * kCheckConstIntervalInst)))) { |
| 1771 | return; |
| 1772 | } |
| 1773 | |
| 1774 | // If we did not return by now, we need to emit the constant pool soon. |
| 1775 | |
| 1776 | // However, some small sequences of instructions must not be broken up by the |
| 1777 | // insertion of a constant pool; such sequences are protected by setting |
| 1778 | // no_const_pool_before_, which is checked here. Also, recursive calls to |
| 1779 | // CheckConstPool are blocked by no_const_pool_before_. |
| 1780 | if (pc_offset() < no_const_pool_before_) { |
| 1781 | // Emission is currently blocked; make sure we try again as soon as possible |
| 1782 | next_buffer_check_ = no_const_pool_before_; |
| 1783 | |
| 1784 | // Something is wrong if emission is forced and blocked at the same time |
| 1785 | ASSERT(!force_emit); |
| 1786 | return; |
| 1787 | } |
| 1788 | |
| 1789 | int jump_instr = require_jump ? kInstrSize : 0; |
| 1790 | |
| 1791 | // Check that the code buffer is large enough before emitting the constant |
| 1792 | // pool and relocation information (include the jump over the pool and the |
| 1793 | // constant pool marker). |
| 1794 | int max_needed_space = |
| 1795 | jump_instr + kInstrSize + num_prinfo_*(kInstrSize + kMaxRelocSize); |
| 1796 | while (buffer_space() <= (max_needed_space + kGap)) GrowBuffer(); |
| 1797 | |
| 1798 | // Block recursive calls to CheckConstPool |
| 1799 | BlockConstPoolBefore(pc_offset() + jump_instr + kInstrSize + |
| 1800 | num_prinfo_*kInstrSize); |
| 1801 | // Don't bother to check for the emit calls below. |
| 1802 | next_buffer_check_ = no_const_pool_before_; |
| 1803 | |
| 1804 | // Emit jump over constant pool if necessary |
| 1805 | Label after_pool; |
| 1806 | if (require_jump) b(&after_pool); |
| 1807 | |
| 1808 | RecordComment("[ Constant Pool"); |
| 1809 | |
| 1810 | // Put down constant pool marker |
| 1811 | // "Undefined instruction" as specified by A3.1 Instruction set encoding |
| 1812 | emit(0x03000000 | num_prinfo_); |
| 1813 | |
| 1814 | // Emit constant pool entries |
| 1815 | for (int i = 0; i < num_prinfo_; i++) { |
| 1816 | RelocInfo& rinfo = prinfo_[i]; |
| 1817 | ASSERT(rinfo.rmode() != RelocInfo::COMMENT && |
| 1818 | rinfo.rmode() != RelocInfo::POSITION && |
| 1819 | rinfo.rmode() != RelocInfo::STATEMENT_POSITION); |
| 1820 | Instr instr = instr_at(rinfo.pc()); |
| 1821 | |
| 1822 | // Instruction to patch must be a ldr/str [pc, #offset] |
| 1823 | // P and U set, B and W clear, Rn == pc, offset12 still 0 |
| 1824 | ASSERT((instr & (7*B25 | P | U | B | W | 15*B16 | Off12Mask)) == |
| 1825 | (2*B25 | P | U | pc.code()*B16)); |
| 1826 | int delta = pc_ - rinfo.pc() - 8; |
| 1827 | ASSERT(delta >= -4); // instr could be ldr pc, [pc, #-4] followed by targ32 |
| 1828 | if (delta < 0) { |
| 1829 | instr &= ~U; |
| 1830 | delta = -delta; |
| 1831 | } |
| 1832 | ASSERT(is_uint12(delta)); |
| 1833 | instr_at_put(rinfo.pc(), instr + delta); |
| 1834 | emit(rinfo.data()); |
| 1835 | } |
| 1836 | num_prinfo_ = 0; |
| 1837 | last_const_pool_end_ = pc_offset(); |
| 1838 | |
| 1839 | RecordComment("]"); |
| 1840 | |
| 1841 | if (after_pool.is_linked()) { |
| 1842 | bind(&after_pool); |
| 1843 | } |
| 1844 | |
| 1845 | // Since a constant pool was just emitted, move the check offset forward by |
| 1846 | // the standard interval. |
| 1847 | next_buffer_check_ = pc_offset() + kCheckConstInterval; |
| 1848 | } |
| 1849 | |
| 1850 | |
| 1851 | } } // namespace v8::internal |