quick_entrypoints_arm64.S revision 6b90d42316e0370c789dddb5dda48d7403ea378f
1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "asm_support_arm64.S" 18 19#include "arch/quick_alloc_entrypoints.S" 20 21 22 /* 23 * Macro that sets up the callee save frame to conform with 24 * Runtime::CreateCalleeSaveMethod(kSaveAll) 25 */ 26.macro SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 27 adrp xIP0, :got:_ZN3art7Runtime9instance_E 28 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 29 30 // Our registers aren't intermixed - just spill in order. 31 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 32 33 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 34 THIS_LOAD_REQUIRES_READ_BARRIER 35 36 // Loads appropriate callee-save-method. 37 ldr xIP0, [xIP0, RUNTIME_SAVE_ALL_CALLEE_SAVE_FRAME_OFFSET ] 38 39 sub sp, sp, #176 40 .cfi_adjust_cfa_offset 176 41 42 // Ugly compile-time check, but we only have the preprocessor. 43#if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVE != 176) 44#error "SAVE_ALL_CALLEE_SAVE_FRAME(ARM64) size not as expected." 45#endif 46 47 // Stack alignment filler [sp, #8]. 48 // FP callee-saves. 49 stp d8, d9, [sp, #16] 50 stp d10, d11, [sp, #32] 51 stp d12, d13, [sp, #48] 52 stp d14, d15, [sp, #64] 53 54 // GP callee-saves 55 stp x19, x20, [sp, #80] 56 .cfi_rel_offset x19, 80 57 .cfi_rel_offset x20, 88 58 59 stp x21, x22, [sp, #96] 60 .cfi_rel_offset x21, 96 61 .cfi_rel_offset x22, 104 62 63 stp x23, x24, [sp, #112] 64 .cfi_rel_offset x23, 112 65 .cfi_rel_offset x24, 120 66 67 stp x25, x26, [sp, #128] 68 .cfi_rel_offset x25, 128 69 .cfi_rel_offset x26, 136 70 71 stp x27, x28, [sp, #144] 72 .cfi_rel_offset x27, 144 73 .cfi_rel_offset x28, 152 74 75 stp x29, xLR, [sp, #160] 76 .cfi_rel_offset x29, 160 77 .cfi_rel_offset x30, 168 78 79 // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs]. 80 str xIP0, [sp] 81 // Place sp in Thread::Current()->top_quick_frame. 82 mov xIP0, sp 83 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 84.endm 85 86 /* 87 * Macro that sets up the callee save frame to conform with 88 * Runtime::CreateCalleeSaveMethod(kRefsOnly). 89 */ 90.macro SETUP_REFS_ONLY_CALLEE_SAVE_FRAME 91 adrp xIP0, :got:_ZN3art7Runtime9instance_E 92 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 93 94 // Our registers aren't intermixed - just spill in order. 95 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 96 97 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefOnly] . 98 THIS_LOAD_REQUIRES_READ_BARRIER 99 100 // Loads appropriate callee-save-method. 101 ldr xIP0, [xIP0, RUNTIME_REFS_ONLY_CALLEE_SAVE_FRAME_OFFSET ] 102 103 sub sp, sp, #96 104 .cfi_adjust_cfa_offset 96 105 106 // Ugly compile-time check, but we only have the preprocessor. 107#if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 96) 108#error "REFS_ONLY_CALLEE_SAVE_FRAME(ARM64) size not as expected." 109#endif 110 111 // GP callee-saves. 112 // x20 paired with ArtMethod* - see below. 113 stp x21, x22, [sp, #16] 114 .cfi_rel_offset x21, 16 115 .cfi_rel_offset x22, 24 116 117 stp x23, x24, [sp, #32] 118 .cfi_rel_offset x23, 32 119 .cfi_rel_offset x24, 40 120 121 stp x25, x26, [sp, #48] 122 .cfi_rel_offset x25, 48 123 .cfi_rel_offset x26, 56 124 125 stp x27, x28, [sp, #64] 126 .cfi_rel_offset x27, 64 127 .cfi_rel_offset x28, 72 128 129 stp x29, xLR, [sp, #80] 130 .cfi_rel_offset x29, 80 131 .cfi_rel_offset x30, 88 132 133 // Store ArtMethod* Runtime::callee_save_methods_[kRefsOnly]. 134 stp xIP0, x20, [sp] 135 .cfi_rel_offset x20, 8 136 137 // Place sp in Thread::Current()->top_quick_frame. 138 mov xIP0, sp 139 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 140.endm 141 142// TODO: Probably no need to restore registers preserved by aapcs64. 143.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 144 // Callee-saves. 145 ldr x20, [sp, #8] 146 .cfi_restore x20 147 148 ldp x21, x22, [sp, #16] 149 .cfi_restore x21 150 .cfi_restore x22 151 152 ldp x23, x24, [sp, #32] 153 .cfi_restore x23 154 .cfi_restore x24 155 156 ldp x25, x26, [sp, #48] 157 .cfi_restore x25 158 .cfi_restore x26 159 160 ldp x27, x28, [sp, #64] 161 .cfi_restore x27 162 .cfi_restore x28 163 164 ldp x29, xLR, [sp, #80] 165 .cfi_restore x29 166 .cfi_restore x30 167 168 add sp, sp, #96 169 .cfi_adjust_cfa_offset -96 170.endm 171 172.macro POP_REFS_ONLY_CALLEE_SAVE_FRAME 173 add sp, sp, #96 174 .cfi_adjust_cfa_offset - 96 175.endm 176 177.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 178 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 179 ret 180.endm 181 182 183.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 184 sub sp, sp, #224 185 .cfi_adjust_cfa_offset 224 186 187 // Ugly compile-time check, but we only have the preprocessor. 188#if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 224) 189#error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(ARM64) size not as expected." 190#endif 191 192 // Stack alignment filler [sp, #8]. 193 // FP args. 194 stp d0, d1, [sp, #16] 195 stp d2, d3, [sp, #32] 196 stp d4, d5, [sp, #48] 197 stp d6, d7, [sp, #64] 198 199 // Core args. 200 stp x1, x2, [sp, #80] 201 .cfi_rel_offset x1, 80 202 .cfi_rel_offset x2, 88 203 204 stp x3, x4, [sp, #96] 205 .cfi_rel_offset x3, 96 206 .cfi_rel_offset x4, 104 207 208 stp x5, x6, [sp, #112] 209 .cfi_rel_offset x5, 112 210 .cfi_rel_offset x6, 120 211 212 // x7, Callee-saves. 213 stp x7, x20, [sp, #128] 214 .cfi_rel_offset x7, 128 215 .cfi_rel_offset x20, 136 216 217 stp x21, x22, [sp, #144] 218 .cfi_rel_offset x21, 144 219 .cfi_rel_offset x22, 152 220 221 stp x23, x24, [sp, #160] 222 .cfi_rel_offset x23, 160 223 .cfi_rel_offset x24, 168 224 225 stp x25, x26, [sp, #176] 226 .cfi_rel_offset x25, 176 227 .cfi_rel_offset x26, 184 228 229 stp x27, x28, [sp, #192] 230 .cfi_rel_offset x27, 192 231 .cfi_rel_offset x28, 200 232 233 // x29(callee-save) and LR. 234 stp x29, xLR, [sp, #208] 235 .cfi_rel_offset x29, 208 236 .cfi_rel_offset x30, 216 237 238.endm 239 240 /* 241 * Macro that sets up the callee save frame to conform with 242 * Runtime::CreateCalleeSaveMethod(kRefsAndArgs). 243 * 244 * TODO This is probably too conservative - saving FP & LR. 245 */ 246.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 247 adrp xIP0, :got:_ZN3art7Runtime9instance_E 248 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 249 250 // Our registers aren't intermixed - just spill in order. 251 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 252 253 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 254 THIS_LOAD_REQUIRES_READ_BARRIER 255 ldr xIP0, [xIP0, RUNTIME_REFS_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET ] 256 257 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 258 259 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 260 // Place sp in Thread::Current()->top_quick_frame. 261 mov xIP0, sp 262 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 263.endm 264 265.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 266 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 267 str x0, [sp, #0] // Store ArtMethod* to bottom of stack. 268 // Place sp in Thread::Current()->top_quick_frame. 269 mov xIP0, sp 270 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 271.endm 272 273// TODO: Probably no need to restore registers preserved by aapcs64. 274.macro RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 275 // FP args. 276 ldp d0, d1, [sp, #16] 277 ldp d2, d3, [sp, #32] 278 ldp d4, d5, [sp, #48] 279 ldp d6, d7, [sp, #64] 280 281 // Core args. 282 ldp x1, x2, [sp, #80] 283 .cfi_restore x1 284 .cfi_restore x2 285 286 ldp x3, x4, [sp, #96] 287 .cfi_restore x3 288 .cfi_restore x4 289 290 ldp x5, x6, [sp, #112] 291 .cfi_restore x5 292 .cfi_restore x6 293 294 // x7, Callee-saves. 295 ldp x7, x20, [sp, #128] 296 .cfi_restore x7 297 .cfi_restore x20 298 299 ldp x21, x22, [sp, #144] 300 .cfi_restore x21 301 .cfi_restore x22 302 303 ldp x23, x24, [sp, #160] 304 .cfi_restore x23 305 .cfi_restore x24 306 307 ldp x25, x26, [sp, #176] 308 .cfi_restore x25 309 .cfi_restore x26 310 311 ldp x27, x28, [sp, #192] 312 .cfi_restore x27 313 .cfi_restore x28 314 315 // x29(callee-save) and LR. 316 ldp x29, xLR, [sp, #208] 317 .cfi_restore x29 318 .cfi_restore x30 319 320 add sp, sp, #224 321 .cfi_adjust_cfa_offset -224 322.endm 323 324.macro RETURN_IF_RESULT_IS_ZERO 325 cbnz x0, 1f // result non-zero branch over 326 ret // return 3271: 328.endm 329 330.macro RETURN_IF_RESULT_IS_NON_ZERO 331 cbz x0, 1f // result zero branch over 332 ret // return 3331: 334.endm 335 336 /* 337 * Macro that set calls through to artDeliverPendingExceptionFromCode, where the pending 338 * exception is Thread::Current()->exception_ 339 */ 340.macro DELIVER_PENDING_EXCEPTION 341 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 342 mov x0, xSELF 343 344 // Point of no return. 345 b artDeliverPendingExceptionFromCode // artDeliverPendingExceptionFromCode(Thread*) 346 brk 0 // Unreached 347.endm 348 349.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_REG reg 350 ldr \reg, [xSELF, # THREAD_EXCEPTION_OFFSET] // Get exception field. 351 cbnz \reg, 1f 352 ret 3531: 354 DELIVER_PENDING_EXCEPTION 355.endm 356 357.macro RETURN_OR_DELIVER_PENDING_EXCEPTION 358 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG xIP0 359.endm 360 361// Same as above with x1. This is helpful in stubs that want to avoid clobbering another register. 362.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 363 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG x1 364.endm 365 366.macro RETURN_IF_W0_IS_ZERO_OR_DELIVER 367 cbnz w0, 1f // result non-zero branch over 368 ret // return 3691: 370 DELIVER_PENDING_EXCEPTION 371.endm 372 373.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 374 .extern \cxx_name 375ENTRY \c_name 376 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 377 mov x0, xSELF // pass Thread::Current 378 b \cxx_name // \cxx_name(Thread*) 379END \c_name 380.endm 381 382.macro ONE_ARG_RUNTIME_EXCEPTION c_name, cxx_name 383 .extern \cxx_name 384ENTRY \c_name 385 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context. 386 mov x1, xSELF // pass Thread::Current. 387 b \cxx_name // \cxx_name(arg, Thread*). 388 brk 0 389END \c_name 390.endm 391 392.macro TWO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 393 .extern \cxx_name 394ENTRY \c_name 395 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 396 mov x2, xSELF // pass Thread::Current 397 b \cxx_name // \cxx_name(arg1, arg2, Thread*) 398 brk 0 399END \c_name 400.endm 401 402 /* 403 * Called by managed code, saves callee saves and then calls artThrowException 404 * that will place a mock Method* at the bottom of the stack. Arg1 holds the exception. 405 */ 406ONE_ARG_RUNTIME_EXCEPTION art_quick_deliver_exception, artDeliverExceptionFromCode 407 408 /* 409 * Called by managed code to create and deliver a NullPointerException. 410 */ 411NO_ARG_RUNTIME_EXCEPTION art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode 412 413 /* 414 * Called by managed code to create and deliver an ArithmeticException. 415 */ 416NO_ARG_RUNTIME_EXCEPTION art_quick_throw_div_zero, artThrowDivZeroFromCode 417 418 /* 419 * Called by managed code to create and deliver an ArrayIndexOutOfBoundsException. Arg1 holds 420 * index, arg2 holds limit. 421 */ 422TWO_ARG_RUNTIME_EXCEPTION art_quick_throw_array_bounds, artThrowArrayBoundsFromCode 423 424 /* 425 * Called by managed code to create and deliver a StackOverflowError. 426 */ 427NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode 428 429 /* 430 * Called by managed code to create and deliver a NoSuchMethodError. 431 */ 432ONE_ARG_RUNTIME_EXCEPTION art_quick_throw_no_such_method, artThrowNoSuchMethodFromCode 433 434 /* 435 * All generated callsites for interface invokes and invocation slow paths will load arguments 436 * as usual - except instead of loading arg0/x0 with the target Method*, arg0/x0 will contain 437 * the method_idx. This wrapper will save arg1-arg3, and call the appropriate C helper. 438 * NOTE: "this" is first visible argument of the target, and so can be found in arg1/x1. 439 * 440 * The helper will attempt to locate the target and return a 128-bit result in x0/x1 consisting 441 * of the target Method* in x0 and method->code_ in x1. 442 * 443 * If unsuccessful, the helper will return null/????. There will be a pending exception in the 444 * thread and we branch to another stub to deliver it. 445 * 446 * On success this wrapper will restore arguments and *jump* to the target, leaving the lr 447 * pointing back to the original caller. 448 * 449 * Adapted from ARM32 code. 450 * 451 * Clobbers xIP0. 452 */ 453.macro INVOKE_TRAMPOLINE c_name, cxx_name 454 .extern \cxx_name 455ENTRY \c_name 456 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME // save callee saves in case allocation triggers GC 457 // Helper signature is always 458 // (method_idx, *this_object, *caller_method, *self, sp) 459 460 mov x2, xSELF // pass Thread::Current 461 mov x3, sp 462 bl \cxx_name // (method_idx, this, Thread*, SP) 463 mov xIP0, x1 // save Method*->code_ 464 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 465 cbz x0, 1f // did we find the target? if not go to exception delivery 466 br xIP0 // tail call to target 4671: 468 DELIVER_PENDING_EXCEPTION 469END \c_name 470.endm 471 472INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline, artInvokeInterfaceTrampoline 473INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline_with_access_check, artInvokeInterfaceTrampolineWithAccessCheck 474 475INVOKE_TRAMPOLINE art_quick_invoke_static_trampoline_with_access_check, artInvokeStaticTrampolineWithAccessCheck 476INVOKE_TRAMPOLINE art_quick_invoke_direct_trampoline_with_access_check, artInvokeDirectTrampolineWithAccessCheck 477INVOKE_TRAMPOLINE art_quick_invoke_super_trampoline_with_access_check, artInvokeSuperTrampolineWithAccessCheck 478INVOKE_TRAMPOLINE art_quick_invoke_virtual_trampoline_with_access_check, artInvokeVirtualTrampolineWithAccessCheck 479 480 481.macro INVOKE_STUB_CREATE_FRAME 482 483SAVE_SIZE=15*8 // x4, x5, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, SP, LR, FP saved. 484SAVE_SIZE_AND_METHOD=SAVE_SIZE+8 485 486 487 mov x9, sp // Save stack pointer. 488 .cfi_register sp,x9 489 490 add x10, x2, # SAVE_SIZE_AND_METHOD // calculate size of frame. 491 sub x10, sp, x10 // Calculate SP position - saves + ArtMethod* + args 492 and x10, x10, # ~0xf // Enforce 16 byte stack alignment. 493 mov sp, x10 // Set new SP. 494 495 sub x10, x9, #SAVE_SIZE // Calculate new FP (later). Done here as we must move SP 496 .cfi_def_cfa_register x10 // before this. 497 .cfi_adjust_cfa_offset SAVE_SIZE 498 499 str x28, [x10, #112] 500 .cfi_rel_offset x28, 112 501 502 stp x26, x27, [x10, #96] 503 .cfi_rel_offset x26, 96 504 .cfi_rel_offset x27, 104 505 506 stp x24, x25, [x10, #80] 507 .cfi_rel_offset x24, 80 508 .cfi_rel_offset x25, 88 509 510 stp x22, x23, [x10, #64] 511 .cfi_rel_offset x22, 64 512 .cfi_rel_offset x23, 72 513 514 stp x20, x21, [x10, #48] 515 .cfi_rel_offset x20, 48 516 .cfi_rel_offset x21, 56 517 518 stp x9, x19, [x10, #32] // Save old stack pointer and x19. 519 .cfi_rel_offset sp, 32 520 .cfi_rel_offset x19, 40 521 522 stp x4, x5, [x10, #16] // Save result and shorty addresses. 523 .cfi_rel_offset x4, 16 524 .cfi_rel_offset x5, 24 525 526 stp xFP, xLR, [x10] // Store LR & FP. 527 .cfi_rel_offset x29, 0 528 .cfi_rel_offset x30, 8 529 530 mov xFP, x10 // Use xFP now, as it's callee-saved. 531 .cfi_def_cfa_register x29 532 mov xSELF, x3 // Move thread pointer into SELF register. 533 534 // Copy arguments into stack frame. 535 // Use simple copy routine for now. 536 // 4 bytes per slot. 537 // X1 - source address 538 // W2 - args length 539 // X9 - destination address. 540 // W10 - temporary 541 add x9, sp, #8 // Destination address is bottom of stack + null. 542 543 // Use \@ to differentiate between macro invocations. 544.LcopyParams\@: 545 cmp w2, #0 546 beq .LendCopyParams\@ 547 sub w2, w2, #4 // Need 65536 bytes of range. 548 ldr w10, [x1, x2] 549 str w10, [x9, x2] 550 551 b .LcopyParams\@ 552 553.LendCopyParams\@: 554 555 // Store null into ArtMethod* at bottom of frame. 556 str xzr, [sp] 557.endm 558 559.macro INVOKE_STUB_CALL_AND_RETURN 560 561 // load method-> METHOD_QUICK_CODE_OFFSET 562 ldr x9, [x0, #ART_METHOD_QUICK_CODE_OFFSET_64] 563 // Branch to method. 564 blr x9 565 566 // Restore return value address and shorty address. 567 ldp x4,x5, [xFP, #16] 568 .cfi_restore x4 569 .cfi_restore x5 570 571 ldr x28, [xFP, #112] 572 .cfi_restore x28 573 574 ldp x26, x27, [xFP, #96] 575 .cfi_restore x26 576 .cfi_restore x27 577 578 ldp x24, x25, [xFP, #80] 579 .cfi_restore x24 580 .cfi_restore x25 581 582 ldp x22, x23, [xFP, #64] 583 .cfi_restore x22 584 .cfi_restore x23 585 586 ldp x20, x21, [xFP, #48] 587 .cfi_restore x20 588 .cfi_restore x21 589 590 // Store result (w0/x0/s0/d0) appropriately, depending on resultType. 591 ldrb w10, [x5] 592 593 // Don't set anything for a void type. 594 cmp w10, #'V' 595 beq .Lexit_art_quick_invoke_stub\@ 596 597 cmp w10, #'D' 598 bne .Lreturn_is_float\@ 599 str d0, [x4] 600 b .Lexit_art_quick_invoke_stub\@ 601 602.Lreturn_is_float\@: 603 cmp w10, #'F' 604 bne .Lreturn_is_int\@ 605 str s0, [x4] 606 b .Lexit_art_quick_invoke_stub\@ 607 608 // Just store x0. Doesn't matter if it is 64 or 32 bits. 609.Lreturn_is_int\@: 610 str x0, [x4] 611 612.Lexit_art_quick_invoke_stub\@: 613 ldp x2, x19, [xFP, #32] // Restore stack pointer and x19. 614 .cfi_restore x19 615 mov sp, x2 616 .cfi_restore sp 617 618 ldp xFP, xLR, [xFP] // Restore old frame pointer and link register. 619 .cfi_restore x29 620 .cfi_restore x30 621 622 ret 623 624.endm 625 626 627/* 628 * extern"C" void art_quick_invoke_stub(ArtMethod *method, x0 629 * uint32_t *args, x1 630 * uint32_t argsize, w2 631 * Thread *self, x3 632 * JValue *result, x4 633 * char *shorty); x5 634 * +----------------------+ 635 * | | 636 * | C/C++ frame | 637 * | LR'' | 638 * | FP'' | <- SP' 639 * +----------------------+ 640 * +----------------------+ 641 * | x28 | <- TODO: Remove callee-saves. 642 * | : | 643 * | x19 | 644 * | SP' | 645 * | X5 | 646 * | X4 | Saved registers 647 * | LR' | 648 * | FP' | <- FP 649 * +----------------------+ 650 * | uint32_t out[n-1] | 651 * | : : | Outs 652 * | uint32_t out[0] | 653 * | ArtMethod* | <- SP value=null 654 * +----------------------+ 655 * 656 * Outgoing registers: 657 * x0 - Method* 658 * x1-x7 - integer parameters. 659 * d0-d7 - Floating point parameters. 660 * xSELF = self 661 * SP = & of ArtMethod* 662 * x1 = "this" pointer. 663 * 664 */ 665ENTRY art_quick_invoke_stub 666 // Spill registers as per AACPS64 calling convention. 667 INVOKE_STUB_CREATE_FRAME 668 669 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 670 // Parse the passed shorty to determine which register to load. 671 // Load addresses for routines that load WXSD registers. 672 adr x11, .LstoreW2 673 adr x12, .LstoreX2 674 adr x13, .LstoreS0 675 adr x14, .LstoreD0 676 677 // Initialize routine offsets to 0 for integers and floats. 678 // x8 for integers, x15 for floating point. 679 mov x8, #0 680 mov x15, #0 681 682 add x10, x5, #1 // Load shorty address, plus one to skip return value. 683 ldr w1, [x9],#4 // Load "this" parameter, and increment arg pointer. 684 685 // Loop to fill registers. 686.LfillRegisters: 687 ldrb w17, [x10], #1 // Load next character in signature, and increment. 688 cbz w17, .LcallFunction // Exit at end of signature. Shorty 0 terminated. 689 690 cmp w17, #'F' // is this a float? 691 bne .LisDouble 692 693 cmp x15, # 8*12 // Skip this load if all registers full. 694 beq .Ladvance4 695 696 add x17, x13, x15 // Calculate subroutine to jump to. 697 br x17 698 699.LisDouble: 700 cmp w17, #'D' // is this a double? 701 bne .LisLong 702 703 cmp x15, # 8*12 // Skip this load if all registers full. 704 beq .Ladvance8 705 706 add x17, x14, x15 // Calculate subroutine to jump to. 707 br x17 708 709.LisLong: 710 cmp w17, #'J' // is this a long? 711 bne .LisOther 712 713 cmp x8, # 6*12 // Skip this load if all registers full. 714 beq .Ladvance8 715 716 add x17, x12, x8 // Calculate subroutine to jump to. 717 br x17 718 719.LisOther: // Everything else takes one vReg. 720 cmp x8, # 6*12 // Skip this load if all registers full. 721 beq .Ladvance4 722 723 add x17, x11, x8 // Calculate subroutine to jump to. 724 br x17 725 726.Ladvance4: 727 add x9, x9, #4 728 b .LfillRegisters 729 730.Ladvance8: 731 add x9, x9, #8 732 b .LfillRegisters 733 734// Macro for loading a parameter into a register. 735// counter - the register with offset into these tables 736// size - the size of the register - 4 or 8 bytes. 737// register - the name of the register to be loaded. 738.macro LOADREG counter size register return 739 ldr \register , [x9], #\size 740 add \counter, \counter, 12 741 b \return 742.endm 743 744// Store ints. 745.LstoreW2: 746 LOADREG x8 4 w2 .LfillRegisters 747 LOADREG x8 4 w3 .LfillRegisters 748 LOADREG x8 4 w4 .LfillRegisters 749 LOADREG x8 4 w5 .LfillRegisters 750 LOADREG x8 4 w6 .LfillRegisters 751 LOADREG x8 4 w7 .LfillRegisters 752 753// Store longs. 754.LstoreX2: 755 LOADREG x8 8 x2 .LfillRegisters 756 LOADREG x8 8 x3 .LfillRegisters 757 LOADREG x8 8 x4 .LfillRegisters 758 LOADREG x8 8 x5 .LfillRegisters 759 LOADREG x8 8 x6 .LfillRegisters 760 LOADREG x8 8 x7 .LfillRegisters 761 762// Store singles. 763.LstoreS0: 764 LOADREG x15 4 s0 .LfillRegisters 765 LOADREG x15 4 s1 .LfillRegisters 766 LOADREG x15 4 s2 .LfillRegisters 767 LOADREG x15 4 s3 .LfillRegisters 768 LOADREG x15 4 s4 .LfillRegisters 769 LOADREG x15 4 s5 .LfillRegisters 770 LOADREG x15 4 s6 .LfillRegisters 771 LOADREG x15 4 s7 .LfillRegisters 772 773// Store doubles. 774.LstoreD0: 775 LOADREG x15 8 d0 .LfillRegisters 776 LOADREG x15 8 d1 .LfillRegisters 777 LOADREG x15 8 d2 .LfillRegisters 778 LOADREG x15 8 d3 .LfillRegisters 779 LOADREG x15 8 d4 .LfillRegisters 780 LOADREG x15 8 d5 .LfillRegisters 781 LOADREG x15 8 d6 .LfillRegisters 782 LOADREG x15 8 d7 .LfillRegisters 783 784 785.LcallFunction: 786 787 INVOKE_STUB_CALL_AND_RETURN 788 789END art_quick_invoke_stub 790 791/* extern"C" 792 * void art_quick_invoke_static_stub(ArtMethod *method, x0 793 * uint32_t *args, x1 794 * uint32_t argsize, w2 795 * Thread *self, x3 796 * JValue *result, x4 797 * char *shorty); x5 798 */ 799ENTRY art_quick_invoke_static_stub 800 // Spill registers as per AACPS64 calling convention. 801 INVOKE_STUB_CREATE_FRAME 802 803 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 804 // Parse the passed shorty to determine which register to load. 805 // Load addresses for routines that load WXSD registers. 806 adr x11, .LstoreW1_2 807 adr x12, .LstoreX1_2 808 adr x13, .LstoreS0_2 809 adr x14, .LstoreD0_2 810 811 // Initialize routine offsets to 0 for integers and floats. 812 // x8 for integers, x15 for floating point. 813 mov x8, #0 814 mov x15, #0 815 816 add x10, x5, #1 // Load shorty address, plus one to skip return value. 817 818 // Loop to fill registers. 819.LfillRegisters2: 820 ldrb w17, [x10], #1 // Load next character in signature, and increment. 821 cbz w17, .LcallFunction2 // Exit at end of signature. Shorty 0 terminated. 822 823 cmp w17, #'F' // is this a float? 824 bne .LisDouble2 825 826 cmp x15, # 8*12 // Skip this load if all registers full. 827 beq .Ladvance4_2 828 829 add x17, x13, x15 // Calculate subroutine to jump to. 830 br x17 831 832.LisDouble2: 833 cmp w17, #'D' // is this a double? 834 bne .LisLong2 835 836 cmp x15, # 8*12 // Skip this load if all registers full. 837 beq .Ladvance8_2 838 839 add x17, x14, x15 // Calculate subroutine to jump to. 840 br x17 841 842.LisLong2: 843 cmp w17, #'J' // is this a long? 844 bne .LisOther2 845 846 cmp x8, # 7*12 // Skip this load if all registers full. 847 beq .Ladvance8_2 848 849 add x17, x12, x8 // Calculate subroutine to jump to. 850 br x17 851 852.LisOther2: // Everything else takes one vReg. 853 cmp x8, # 7*12 // Skip this load if all registers full. 854 beq .Ladvance4_2 855 856 add x17, x11, x8 // Calculate subroutine to jump to. 857 br x17 858 859.Ladvance4_2: 860 add x9, x9, #4 861 b .LfillRegisters2 862 863.Ladvance8_2: 864 add x9, x9, #8 865 b .LfillRegisters2 866 867// Store ints. 868.LstoreW1_2: 869 LOADREG x8 4 w1 .LfillRegisters2 870 LOADREG x8 4 w2 .LfillRegisters2 871 LOADREG x8 4 w3 .LfillRegisters2 872 LOADREG x8 4 w4 .LfillRegisters2 873 LOADREG x8 4 w5 .LfillRegisters2 874 LOADREG x8 4 w6 .LfillRegisters2 875 LOADREG x8 4 w7 .LfillRegisters2 876 877// Store longs. 878.LstoreX1_2: 879 LOADREG x8 8 x1 .LfillRegisters2 880 LOADREG x8 8 x2 .LfillRegisters2 881 LOADREG x8 8 x3 .LfillRegisters2 882 LOADREG x8 8 x4 .LfillRegisters2 883 LOADREG x8 8 x5 .LfillRegisters2 884 LOADREG x8 8 x6 .LfillRegisters2 885 LOADREG x8 8 x7 .LfillRegisters2 886 887// Store singles. 888.LstoreS0_2: 889 LOADREG x15 4 s0 .LfillRegisters2 890 LOADREG x15 4 s1 .LfillRegisters2 891 LOADREG x15 4 s2 .LfillRegisters2 892 LOADREG x15 4 s3 .LfillRegisters2 893 LOADREG x15 4 s4 .LfillRegisters2 894 LOADREG x15 4 s5 .LfillRegisters2 895 LOADREG x15 4 s6 .LfillRegisters2 896 LOADREG x15 4 s7 .LfillRegisters2 897 898// Store doubles. 899.LstoreD0_2: 900 LOADREG x15 8 d0 .LfillRegisters2 901 LOADREG x15 8 d1 .LfillRegisters2 902 LOADREG x15 8 d2 .LfillRegisters2 903 LOADREG x15 8 d3 .LfillRegisters2 904 LOADREG x15 8 d4 .LfillRegisters2 905 LOADREG x15 8 d5 .LfillRegisters2 906 LOADREG x15 8 d6 .LfillRegisters2 907 LOADREG x15 8 d7 .LfillRegisters2 908 909 910.LcallFunction2: 911 912 INVOKE_STUB_CALL_AND_RETURN 913 914END art_quick_invoke_static_stub 915 916 917 918 /* 919 * On entry x0 is uintptr_t* gprs_ and x1 is uint64_t* fprs_ 920 */ 921 922ENTRY art_quick_do_long_jump 923 // Load FPRs 924 ldp d0, d1, [x1], #16 925 ldp d2, d3, [x1], #16 926 ldp d4, d5, [x1], #16 927 ldp d6, d7, [x1], #16 928 ldp d8, d9, [x1], #16 929 ldp d10, d11, [x1], #16 930 ldp d12, d13, [x1], #16 931 ldp d14, d15, [x1], #16 932 ldp d16, d17, [x1], #16 933 ldp d18, d19, [x1], #16 934 ldp d20, d21, [x1], #16 935 ldp d22, d23, [x1], #16 936 ldp d24, d25, [x1], #16 937 ldp d26, d27, [x1], #16 938 ldp d28, d29, [x1], #16 939 ldp d30, d31, [x1] 940 941 // Load GPRs 942 // TODO: lots of those are smashed, could optimize. 943 add x0, x0, #30*8 944 ldp x30, x1, [x0], #-16 945 ldp x28, x29, [x0], #-16 946 ldp x26, x27, [x0], #-16 947 ldp x24, x25, [x0], #-16 948 ldp x22, x23, [x0], #-16 949 ldp x20, x21, [x0], #-16 950 ldp x18, x19, [x0], #-16 951 ldp x16, x17, [x0], #-16 952 ldp x14, x15, [x0], #-16 953 ldp x12, x13, [x0], #-16 954 ldp x10, x11, [x0], #-16 955 ldp x8, x9, [x0], #-16 956 ldp x6, x7, [x0], #-16 957 ldp x4, x5, [x0], #-16 958 ldp x2, x3, [x0], #-16 959 mov sp, x1 960 961 // TODO: Is it really OK to use LR for the target PC? 962 mov x0, #0 963 mov x1, #0 964 br xLR 965END art_quick_do_long_jump 966 967 /* 968 * Entry from managed code that calls artLockObjectFromCode, may block for GC. x0 holds the 969 * possibly null object to lock. 970 * 971 * Derived from arm32 code. 972 */ 973 .extern artLockObjectFromCode 974ENTRY art_quick_lock_object 975 cbz w0, .Lslow_lock 976 add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore 977.Lretry_lock: 978 ldr w2, [xSELF, #THREAD_ID_OFFSET] // TODO: Can the thread ID really change during the loop? 979 ldxr w1, [x4] 980 mov x3, x1 981 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 982 cbnz w3, .Lnot_unlocked // already thin locked 983 // unlocked case - x1: original lock word that's zero except for the read barrier bits. 984 orr x2, x1, x2 // x2 holds thread id with count of 0 with preserved read barrier bits 985 stxr w3, w2, [x4] 986 cbnz w3, .Llock_stxr_fail // store failed, retry 987 dmb ishld // full (LoadLoad|LoadStore) memory barrier 988 ret 989.Lnot_unlocked: // x1: original lock word 990 lsr w3, w1, LOCK_WORD_STATE_SHIFT 991 cbnz w3, .Lslow_lock // if either of the top two bits are set, go slow path 992 eor w2, w1, w2 // lock_word.ThreadId() ^ self->ThreadId() 993 uxth w2, w2 // zero top 16 bits 994 cbnz w2, .Lslow_lock // lock word and self thread id's match -> recursive lock 995 // else contention, go to slow path 996 mov x3, x1 // copy the lock word to check count overflow. 997 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits. 998 add w2, w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count in lock word placing in w2 to check overflow 999 lsr w3, w2, LOCK_WORD_READ_BARRIER_STATE_SHIFT // if either of the upper two bits (28-29) are set, we overflowed. 1000 cbnz w3, .Lslow_lock // if we overflow the count go slow path 1001 add w2, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count for real 1002 stxr w3, w2, [x4] 1003 cbnz w3, .Llock_stxr_fail // store failed, retry 1004 ret 1005.Llock_stxr_fail: 1006 b .Lretry_lock // retry 1007.Lslow_lock: 1008 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case we block 1009 mov x1, xSELF // pass Thread::Current 1010 bl artLockObjectFromCode // (Object* obj, Thread*) 1011 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1012 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1013END art_quick_lock_object 1014 1015 /* 1016 * Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure. 1017 * x0 holds the possibly null object to lock. 1018 * 1019 * Derived from arm32 code. 1020 */ 1021 .extern artUnlockObjectFromCode 1022ENTRY art_quick_unlock_object 1023 cbz x0, .Lslow_unlock 1024 add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore 1025.Lretry_unlock: 1026#ifndef USE_READ_BARRIER 1027 ldr w1, [x4] 1028#else 1029 ldxr w1, [x4] // Need to use atomic instructions for read barrier 1030#endif 1031 lsr w2, w1, LOCK_WORD_STATE_SHIFT 1032 cbnz w2, .Lslow_unlock // if either of the top two bits are set, go slow path 1033 ldr w2, [xSELF, #THREAD_ID_OFFSET] 1034 mov x3, x1 // copy lock word to check thread id equality 1035 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1036 eor w3, w3, w2 // lock_word.ThreadId() ^ self->ThreadId() 1037 uxth w3, w3 // zero top 16 bits 1038 cbnz w3, .Lslow_unlock // do lock word and self thread id's match? 1039 mov x3, x1 // copy lock word to detect transition to unlocked 1040 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1041 cmp w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE 1042 bpl .Lrecursive_thin_unlock 1043 // transition to unlocked 1044 mov x3, x1 1045 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK // w3: zero except for the preserved read barrier bits 1046 dmb ish // full (LoadStore|StoreStore) memory barrier 1047#ifndef USE_READ_BARRIER 1048 str w3, [x4] 1049#else 1050 stxr w2, w3, [x4] // Need to use atomic instructions for read barrier 1051 cbnz w2, .Lunlock_stxr_fail // store failed, retry 1052#endif 1053 ret 1054.Lrecursive_thin_unlock: // w1: original lock word 1055 sub w1, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // decrement count 1056#ifndef USE_READ_BARRIER 1057 str w1, [x4] 1058#else 1059 stxr w2, w1, [x4] // Need to use atomic instructions for read barrier 1060 cbnz w2, .Lunlock_stxr_fail // store failed, retry 1061#endif 1062 ret 1063.Lunlock_stxr_fail: 1064 b .Lretry_unlock // retry 1065.Lslow_unlock: 1066 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case exception allocation triggers GC 1067 mov x1, xSELF // pass Thread::Current 1068 bl artUnlockObjectFromCode // (Object* obj, Thread*) 1069 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1070 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1071END art_quick_unlock_object 1072 1073 /* 1074 * Entry from managed code that calls artIsAssignableFromCode and on failure calls 1075 * artThrowClassCastException. 1076 */ 1077 .extern artThrowClassCastException 1078ENTRY art_quick_check_cast 1079 // Store arguments and link register 1080 // Stack needs to be 16B aligned on calls. 1081 stp x0, x1, [sp,#-32]! 1082 .cfi_adjust_cfa_offset 32 1083 .cfi_rel_offset x0, 0 1084 .cfi_rel_offset x1, 8 1085 str xLR, [sp, #24] 1086 .cfi_rel_offset x30, 24 1087 1088 // Call runtime code 1089 bl artIsAssignableFromCode 1090 1091 // Check for exception 1092 cbz x0, .Lthrow_class_cast_exception 1093 1094 // Restore and return 1095 ldr xLR, [sp, #24] 1096 .cfi_restore x30 1097 ldp x0, x1, [sp], #32 1098 .cfi_restore x0 1099 .cfi_restore x1 1100 .cfi_adjust_cfa_offset -32 1101 ret 1102 1103 .cfi_adjust_cfa_offset 32 // Reset unwind info so following code unwinds. 1104 1105.Lthrow_class_cast_exception: 1106 // Restore 1107 ldr xLR, [sp, #24] 1108 .cfi_restore x30 1109 ldp x0, x1, [sp], #32 1110 .cfi_restore x0 1111 .cfi_restore x1 1112 .cfi_adjust_cfa_offset -32 1113 1114 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 1115 mov x2, xSELF // pass Thread::Current 1116 b artThrowClassCastException // (Class*, Class*, Thread*) 1117 brk 0 // We should not return here... 1118END art_quick_check_cast 1119 1120 /* 1121 * Entry from managed code for array put operations of objects where the value being stored 1122 * needs to be checked for compatibility. 1123 * x0 = array, x1 = index, x2 = value 1124 * 1125 * Currently all values should fit into w0/w1/w2, and w1 always will as indices are 32b. We 1126 * assume, though, that the upper 32b are zeroed out. At least for x1/w1 we can do better by 1127 * using index-zero-extension in load/stores. 1128 * 1129 * Temporaries: x3, x4 1130 * TODO: x4 OK? ip seems wrong here. 1131 */ 1132ENTRY art_quick_aput_obj_with_null_and_bound_check 1133 tst x0, x0 1134 bne art_quick_aput_obj_with_bound_check 1135 b art_quick_throw_null_pointer_exception 1136END art_quick_aput_obj_with_null_and_bound_check 1137 1138ENTRY art_quick_aput_obj_with_bound_check 1139 ldr w3, [x0, #MIRROR_ARRAY_LENGTH_OFFSET] 1140 cmp w3, w1 1141 bhi art_quick_aput_obj 1142 mov x0, x1 1143 mov x1, x3 1144 b art_quick_throw_array_bounds 1145END art_quick_aput_obj_with_bound_check 1146 1147ENTRY art_quick_aput_obj 1148 cbz x2, .Ldo_aput_null 1149 ldr w3, [x0, #MIRROR_OBJECT_CLASS_OFFSET] // Heap reference = 32b 1150 // This also zero-extends to x3 1151 UNPOISON_HEAP_REF w3 1152 ldr w4, [x2, #MIRROR_OBJECT_CLASS_OFFSET] // Heap reference = 32b 1153 // This also zero-extends to x4 1154 UNPOISON_HEAP_REF w4 1155 ldr w3, [x3, #MIRROR_CLASS_COMPONENT_TYPE_OFFSET] // Heap reference = 32b 1156 // This also zero-extends to x3 1157 UNPOISON_HEAP_REF w3 1158 cmp w3, w4 // value's type == array's component type - trivial assignability 1159 bne .Lcheck_assignability 1160.Ldo_aput: 1161 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1162 // "Compress" = do nothing 1163 POISON_HEAP_REF w2 1164 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1165 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1166 lsr x0, x0, #7 1167 strb w3, [x3, x0] 1168 ret 1169.Ldo_aput_null: 1170 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1171 // "Compress" = do nothing 1172 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1173 ret 1174.Lcheck_assignability: 1175 // Store arguments and link register 1176 stp x0, x1, [sp,#-32]! 1177 .cfi_adjust_cfa_offset 32 1178 .cfi_rel_offset x0, 0 1179 .cfi_rel_offset x1, 8 1180 stp x2, xLR, [sp, #16] 1181 .cfi_rel_offset x2, 16 1182 .cfi_rel_offset x30, 24 1183 1184 // Call runtime code 1185 mov x0, x3 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1186 mov x1, x4 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1187 bl artIsAssignableFromCode 1188 1189 // Check for exception 1190 cbz x0, .Lthrow_array_store_exception 1191 1192 // Restore 1193 ldp x2, x30, [sp, #16] 1194 .cfi_restore x2 1195 .cfi_restore x30 1196 ldp x0, x1, [sp], #32 1197 .cfi_restore x0 1198 .cfi_restore x1 1199 .cfi_adjust_cfa_offset -32 1200 1201 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1202 // "Compress" = do nothing 1203 POISON_HEAP_REF w2 1204 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1205 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1206 lsr x0, x0, #7 1207 strb w3, [x3, x0] 1208 ret 1209.Lthrow_array_store_exception: 1210 ldp x2, x30, [sp, #16] 1211 .cfi_restore x2 1212 .cfi_restore x30 1213 ldp x0, x1, [sp], #32 1214 .cfi_restore x0 1215 .cfi_restore x1 1216 .cfi_adjust_cfa_offset -32 1217 1218 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1219 mov x1, x2 // Pass value. 1220 mov x2, xSELF // Pass Thread::Current. 1221 b artThrowArrayStoreException // (Object*, Object*, Thread*). 1222 brk 0 // Unreached. 1223END art_quick_aput_obj 1224 1225// Macro to facilitate adding new allocation entrypoints. 1226.macro ONE_ARG_DOWNCALL name, entrypoint, return 1227 .extern \entrypoint 1228ENTRY \name 1229 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1230 mov x1, xSELF // pass Thread::Current 1231 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*) 1232 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1233 \return 1234END \name 1235.endm 1236 1237// Macro to facilitate adding new allocation entrypoints. 1238.macro TWO_ARG_DOWNCALL name, entrypoint, return 1239 .extern \entrypoint 1240ENTRY \name 1241 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1242 mov x2, xSELF // pass Thread::Current 1243 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*) 1244 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1245 \return 1246END \name 1247.endm 1248 1249// Macro to facilitate adding new allocation entrypoints. 1250.macro THREE_ARG_DOWNCALL name, entrypoint, return 1251 .extern \entrypoint 1252ENTRY \name 1253 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1254 mov x3, xSELF // pass Thread::Current 1255 bl \entrypoint 1256 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1257 \return 1258END \name 1259.endm 1260 1261// Macro to facilitate adding new allocation entrypoints. 1262.macro FOUR_ARG_DOWNCALL name, entrypoint, return 1263 .extern \entrypoint 1264ENTRY \name 1265 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1266 mov x4, xSELF // pass Thread::Current 1267 bl \entrypoint // 1268 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1269 \return 1270 DELIVER_PENDING_EXCEPTION 1271END \name 1272.endm 1273 1274// Macros taking opportunity of code similarities for downcalls with referrer. 1275.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return 1276 .extern \entrypoint 1277ENTRY \name 1278 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1279 ldr x1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1280 mov x2, xSELF // pass Thread::Current 1281 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP) 1282 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1283 \return 1284END \name 1285.endm 1286 1287.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return 1288 .extern \entrypoint 1289ENTRY \name 1290 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1291 ldr x2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1292 mov x3, xSELF // pass Thread::Current 1293 bl \entrypoint 1294 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1295 \return 1296END \name 1297.endm 1298 1299.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return 1300 .extern \entrypoint 1301ENTRY \name 1302 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1303 ldr x3, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1304 mov x4, xSELF // pass Thread::Current 1305 bl \entrypoint 1306 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1307 \return 1308END \name 1309.endm 1310 1311.macro RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1312 cbz w0, 1f // result zero branch over 1313 ret // return 13141: 1315 DELIVER_PENDING_EXCEPTION 1316.endm 1317 1318 /* 1319 * Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on 1320 * failure. 1321 */ 1322TWO_ARG_REF_DOWNCALL art_quick_handle_fill_data, artHandleFillArrayDataFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1323 1324 /* 1325 * Entry from managed code when uninitialized static storage, this stub will run the class 1326 * initializer and deliver the exception on error. On success the static storage base is 1327 * returned. 1328 */ 1329ONE_ARG_DOWNCALL art_quick_initialize_static_storage, artInitializeStaticStorageFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1330 1331ONE_ARG_DOWNCALL art_quick_initialize_type, artInitializeTypeFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1332ONE_ARG_DOWNCALL art_quick_initialize_type_and_verify_access, artInitializeTypeAndVerifyAccessFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1333 1334ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1335ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1336ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1337ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1338ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1339ONE_ARG_REF_DOWNCALL art_quick_get64_static, artGet64StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1340ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1341 1342TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1343TWO_ARG_REF_DOWNCALL art_quick_get_byte_instance, artGetByteInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1344TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1345TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1346TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1347TWO_ARG_REF_DOWNCALL art_quick_get64_instance, artGet64InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1348TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1349 1350TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1351TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1352TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1353TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1354 1355THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1356THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1357THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1358THREE_ARG_REF_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1359THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1360 1361// This is separated out as the argument order is different. 1362 .extern artSet64StaticFromCode 1363ENTRY art_quick_set64_static 1364 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1365 mov x3, x1 // Store value 1366 ldr x1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1367 mov x2, x3 // Put value param 1368 mov x3, xSELF // pass Thread::Current 1369 bl artSet64StaticFromCode 1370 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1371 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1372END art_quick_set64_static 1373 1374 /* 1375 * Entry from managed code to resolve a string, this stub will allocate a String and deliver an 1376 * exception on error. On success the String is returned. w0 holds the string index. The fast 1377 * path check for hit in strings cache has already been performed. 1378 */ 1379ONE_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1380 1381// Generate the allocation entrypoints for each allocator. 1382GENERATE_ALL_ALLOC_ENTRYPOINTS 1383 1384 /* 1385 * Called by managed code when the thread has been asked to suspend. 1386 */ 1387 .extern artTestSuspendFromCode 1388ENTRY art_quick_test_suspend 1389 ldrh w0, [xSELF, #THREAD_FLAGS_OFFSET] // get xSELF->state_and_flags.as_struct.flags 1390 cbnz w0, .Lneed_suspend // check flags == 0 1391 ret // return if flags == 0 1392.Lneed_suspend: 1393 mov x0, xSELF 1394 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1395 bl artTestSuspendFromCode // (Thread*) 1396 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1397END art_quick_test_suspend 1398 1399ENTRY art_quick_implicit_suspend 1400 mov x0, xSELF 1401 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1402 bl artTestSuspendFromCode // (Thread*) 1403 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1404END art_quick_implicit_suspend 1405 1406 /* 1407 * Called by managed code that is attempting to call a method on a proxy class. On entry 1408 * x0 holds the proxy method and x1 holds the receiver; The frame size of the invoked proxy 1409 * method agrees with a ref and args callee save frame. 1410 */ 1411 .extern artQuickProxyInvokeHandler 1412ENTRY art_quick_proxy_invoke_handler 1413 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 1414 mov x2, xSELF // pass Thread::Current 1415 mov x3, sp // pass SP 1416 bl artQuickProxyInvokeHandler // (Method* proxy method, receiver, Thread*, SP) 1417 ldr x2, [xSELF, THREAD_EXCEPTION_OFFSET] 1418 cbnz x2, .Lexception_in_proxy // success if no exception is pending 1419 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Restore frame 1420 fmov d0, x0 // Store result in d0 in case it was float or double 1421 ret // return on success 1422.Lexception_in_proxy: 1423 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1424 DELIVER_PENDING_EXCEPTION 1425END art_quick_proxy_invoke_handler 1426 1427 /* 1428 * Called to resolve an imt conflict. xIP1 is a hidden argument that holds the target method's 1429 * dex method index. 1430 */ 1431ENTRY art_quick_imt_conflict_trampoline 1432 mov x0, xIP1 1433 b art_quick_invoke_interface_trampoline 1434END art_quick_imt_conflict_trampoline 1435 1436ENTRY art_quick_resolution_trampoline 1437 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1438 mov x2, xSELF 1439 mov x3, sp 1440 bl artQuickResolutionTrampoline // (called, receiver, Thread*, SP) 1441 cbz x0, 1f 1442 mov xIP0, x0 // Remember returned code pointer in xIP0. 1443 ldr x0, [sp, #0] // artQuickResolutionTrampoline puts called method in *SP. 1444 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1445 br xIP0 14461: 1447 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1448 DELIVER_PENDING_EXCEPTION 1449END art_quick_resolution_trampoline 1450 1451/* 1452 * Generic JNI frame layout: 1453 * 1454 * #-------------------# 1455 * | | 1456 * | caller method... | 1457 * #-------------------# <--- SP on entry 1458 * | Return X30/LR | 1459 * | X29/FP | callee save 1460 * | X28 | callee save 1461 * | X27 | callee save 1462 * | X26 | callee save 1463 * | X25 | callee save 1464 * | X24 | callee save 1465 * | X23 | callee save 1466 * | X22 | callee save 1467 * | X21 | callee save 1468 * | X20 | callee save 1469 * | X19 | callee save 1470 * | X7 | arg7 1471 * | X6 | arg6 1472 * | X5 | arg5 1473 * | X4 | arg4 1474 * | X3 | arg3 1475 * | X2 | arg2 1476 * | X1 | arg1 1477 * | D7 | float arg 8 1478 * | D6 | float arg 7 1479 * | D5 | float arg 6 1480 * | D4 | float arg 5 1481 * | D3 | float arg 4 1482 * | D2 | float arg 3 1483 * | D1 | float arg 2 1484 * | D0 | float arg 1 1485 * | Method* | <- X0 1486 * #-------------------# 1487 * | local ref cookie | // 4B 1488 * | handle scope size | // 4B 1489 * #-------------------# 1490 * | JNI Call Stack | 1491 * #-------------------# <--- SP on native call 1492 * | | 1493 * | Stack for Regs | The trampoline assembly will pop these values 1494 * | | into registers for native call 1495 * #-------------------# 1496 * | Native code ptr | 1497 * #-------------------# 1498 * | Free scratch | 1499 * #-------------------# 1500 * | Ptr to (1) | <--- SP 1501 * #-------------------# 1502 */ 1503 /* 1504 * Called to do a generic JNI down-call 1505 */ 1506ENTRY art_quick_generic_jni_trampoline 1507 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 1508 1509 // Save SP , so we can have static CFI info. 1510 mov x28, sp 1511 .cfi_def_cfa_register x28 1512 1513 // This looks the same, but is different: this will be updated to point to the bottom 1514 // of the frame when the handle scope is inserted. 1515 mov xFP, sp 1516 1517 mov xIP0, #5120 1518 sub sp, sp, xIP0 1519 1520 // prepare for artQuickGenericJniTrampoline call 1521 // (Thread*, SP) 1522 // x0 x1 <= C calling convention 1523 // xSELF xFP <= where they are 1524 1525 mov x0, xSELF // Thread* 1526 mov x1, xFP 1527 bl artQuickGenericJniTrampoline // (Thread*, sp) 1528 1529 // The C call will have registered the complete save-frame on success. 1530 // The result of the call is: 1531 // x0: pointer to native code, 0 on error. 1532 // x1: pointer to the bottom of the used area of the alloca, can restore stack till there. 1533 1534 // Check for error = 0. 1535 cbz x0, .Lexception_in_native 1536 1537 // Release part of the alloca. 1538 mov sp, x1 1539 1540 // Save the code pointer 1541 mov xIP0, x0 1542 1543 // Load parameters from frame into registers. 1544 // TODO Check with artQuickGenericJniTrampoline. 1545 // Also, check again APPCS64 - the stack arguments are interleaved. 1546 ldp x0, x1, [sp] 1547 ldp x2, x3, [sp, #16] 1548 ldp x4, x5, [sp, #32] 1549 ldp x6, x7, [sp, #48] 1550 1551 ldp d0, d1, [sp, #64] 1552 ldp d2, d3, [sp, #80] 1553 ldp d4, d5, [sp, #96] 1554 ldp d6, d7, [sp, #112] 1555 1556 add sp, sp, #128 1557 1558 blr xIP0 // native call. 1559 1560 // result sign extension is handled in C code 1561 // prepare for artQuickGenericJniEndTrampoline call 1562 // (Thread*, result, result_f) 1563 // x0 x1 x2 <= C calling convention 1564 mov x1, x0 // Result (from saved). 1565 mov x0, xSELF // Thread register. 1566 fmov x2, d0 // d0 will contain floating point result, but needs to go into x2 1567 1568 bl artQuickGenericJniEndTrampoline 1569 1570 // Pending exceptions possible. 1571 ldr x2, [xSELF, THREAD_EXCEPTION_OFFSET] 1572 cbnz x2, .Lexception_in_native 1573 1574 // Tear down the alloca. 1575 mov sp, x28 1576 .cfi_def_cfa_register sp 1577 1578 // Tear down the callee-save frame. 1579 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1580 1581 // store into fpr, for when it's a fpr return... 1582 fmov d0, x0 1583 ret 1584 1585.Lexception_in_native: 1586 // Move to x1 then sp to please assembler. 1587 ldr x1, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 1588 mov sp, x1 1589 .cfi_def_cfa_register sp 1590 # This will create a new save-all frame, required by the runtime. 1591 DELIVER_PENDING_EXCEPTION 1592END art_quick_generic_jni_trampoline 1593 1594/* 1595 * Called to bridge from the quick to interpreter ABI. On entry the arguments match those 1596 * of a quick call: 1597 * x0 = method being called/to bridge to. 1598 * x1..x7, d0..d7 = arguments to that method. 1599 */ 1600ENTRY art_quick_to_interpreter_bridge 1601 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Set up frame and save arguments. 1602 1603 // x0 will contain mirror::ArtMethod* method. 1604 mov x1, xSELF // How to get Thread::Current() ??? 1605 mov x2, sp 1606 1607 // uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 1608 // mirror::ArtMethod** sp) 1609 bl artQuickToInterpreterBridge 1610 1611 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // TODO: no need to restore arguments in this case. 1612 1613 fmov d0, x0 1614 1615 RETURN_OR_DELIVER_PENDING_EXCEPTION 1616END art_quick_to_interpreter_bridge 1617 1618 1619// 1620// Instrumentation-related stubs 1621// 1622 .extern artInstrumentationMethodEntryFromCode 1623ENTRY art_quick_instrumentation_entry 1624 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1625 1626 mov x20, x0 // Preserve method reference in a callee-save. 1627 1628 mov x2, xSELF 1629 mov x3, xLR 1630 bl artInstrumentationMethodEntryFromCode // (Method*, Object*, Thread*, LR) 1631 1632 mov xIP0, x0 // x0 = result of call. 1633 mov x0, x20 // Reload method reference. 1634 1635 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Note: will restore xSELF 1636 adr xLR, art_quick_instrumentation_exit 1637 br xIP0 // Tail-call method with lr set to art_quick_instrumentation_exit. 1638END art_quick_instrumentation_entry 1639 1640 .extern artInstrumentationMethodExitFromCode 1641ENTRY art_quick_instrumentation_exit 1642 mov xLR, #0 // Clobber LR for later checks. 1643 1644 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME 1645 1646 // We need to save x0 and d0. We could use a callee-save from SETUP_REF_ONLY, but then 1647 // we would need to fully restore it. As there are a lot of callee-save registers, it seems 1648 // easier to have an extra small stack area. 1649 1650 str x0, [sp, #-16]! // Save integer result. 1651 .cfi_adjust_cfa_offset 16 1652 str d0, [sp, #8] // Save floating-point result. 1653 1654 add x1, sp, #16 // Pass SP. 1655 mov x2, x0 // Pass integer result. 1656 fmov x3, d0 // Pass floating-point result. 1657 mov x0, xSELF // Pass Thread. 1658 bl artInstrumentationMethodExitFromCode // (Thread*, SP, gpr_res, fpr_res) 1659 1660 mov xIP0, x0 // Return address from instrumentation call. 1661 mov xLR, x1 // r1 is holding link register if we're to bounce to deoptimize 1662 1663 ldr d0, [sp, #8] // Restore floating-point result. 1664 ldr x0, [sp], 16 // Restore integer result, and drop stack area. 1665 .cfi_adjust_cfa_offset 16 1666 1667 POP_REFS_ONLY_CALLEE_SAVE_FRAME 1668 1669 br xIP0 // Tail-call out. 1670END art_quick_instrumentation_exit 1671 1672 /* 1673 * Instrumentation has requested that we deoptimize into the interpreter. The deoptimization 1674 * will long jump to the upcall with a special exception of -1. 1675 */ 1676 .extern artDeoptimize 1677ENTRY art_quick_deoptimize 1678 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1679 mov x0, xSELF // Pass thread. 1680 bl artDeoptimize // artDeoptimize(Thread*) 1681 brk 0 1682END art_quick_deoptimize 1683 1684 1685 /* 1686 * String's indexOf. 1687 * 1688 * TODO: Not very optimized. 1689 * On entry: 1690 * x0: string object (known non-null) 1691 * w1: char to match (known <= 0xFFFF) 1692 * w2: Starting offset in string data 1693 */ 1694ENTRY art_quick_indexof 1695 ldr w3, [x0, #MIRROR_STRING_COUNT_OFFSET] 1696 add x0, x0, #MIRROR_STRING_VALUE_OFFSET 1697 1698 /* Clamp start to [0..count] */ 1699 cmp w2, #0 1700 csel w2, wzr, w2, lt 1701 cmp w2, w3 1702 csel w2, w3, w2, gt 1703 1704 /* Save a copy to compute result */ 1705 mov x5, x0 1706 1707 /* Build pointer to start of data to compare and pre-bias */ 1708 add x0, x0, x2, lsl #1 1709 sub x0, x0, #2 1710 1711 /* Compute iteration count */ 1712 sub w2, w3, w2 1713 1714 /* 1715 * At this point we have: 1716 * x0: start of the data to test 1717 * w1: char to compare 1718 * w2: iteration count 1719 * x5: original start of string data 1720 */ 1721 1722 subs w2, w2, #4 1723 b.lt .Lindexof_remainder 1724 1725.Lindexof_loop4: 1726 ldrh w6, [x0, #2]! 1727 ldrh w7, [x0, #2]! 1728 ldrh wIP0, [x0, #2]! 1729 ldrh wIP1, [x0, #2]! 1730 cmp w6, w1 1731 b.eq .Lmatch_0 1732 cmp w7, w1 1733 b.eq .Lmatch_1 1734 cmp wIP0, w1 1735 b.eq .Lmatch_2 1736 cmp wIP1, w1 1737 b.eq .Lmatch_3 1738 subs w2, w2, #4 1739 b.ge .Lindexof_loop4 1740 1741.Lindexof_remainder: 1742 adds w2, w2, #4 1743 b.eq .Lindexof_nomatch 1744 1745.Lindexof_loop1: 1746 ldrh w6, [x0, #2]! 1747 cmp w6, w1 1748 b.eq .Lmatch_3 1749 subs w2, w2, #1 1750 b.ne .Lindexof_loop1 1751 1752.Lindexof_nomatch: 1753 mov x0, #-1 1754 ret 1755 1756.Lmatch_0: 1757 sub x0, x0, #6 1758 sub x0, x0, x5 1759 asr x0, x0, #1 1760 ret 1761.Lmatch_1: 1762 sub x0, x0, #4 1763 sub x0, x0, x5 1764 asr x0, x0, #1 1765 ret 1766.Lmatch_2: 1767 sub x0, x0, #2 1768 sub x0, x0, x5 1769 asr x0, x0, #1 1770 ret 1771.Lmatch_3: 1772 sub x0, x0, x5 1773 asr x0, x0, #1 1774 ret 1775END art_quick_indexof 1776 1777 /* 1778 * String's compareTo. 1779 * 1780 * TODO: Not very optimized. 1781 * 1782 * On entry: 1783 * x0: this object pointer 1784 * x1: comp object pointer 1785 * 1786 */ 1787 .extern __memcmp16 1788ENTRY art_quick_string_compareto 1789 mov x2, x0 // x0 is return, use x2 for first input. 1790 sub x0, x2, x1 // Same string object? 1791 cbnz x0,1f 1792 ret 17931: // Different string objects. 1794 1795 ldr w4, [x2, #MIRROR_STRING_COUNT_OFFSET] 1796 ldr w3, [x1, #MIRROR_STRING_COUNT_OFFSET] 1797 add x2, x2, #MIRROR_STRING_VALUE_OFFSET 1798 add x1, x1, #MIRROR_STRING_VALUE_OFFSET 1799 1800 /* 1801 * Now: Data* Count 1802 * first arg x2 w4 1803 * second arg x1 w3 1804 */ 1805 1806 // x0 := str1.length(w4) - str2.length(w3). ldr zero-extended w3/w4 into x3/x4. 1807 subs x0, x4, x3 1808 // Min(count1, count2) into w3. 1809 csel x3, x3, x4, ge 1810 1811 // TODO: Tune this value. 1812 // Check for long string, do memcmp16 for them. 1813 cmp w3, #28 // Constant from arm32. 1814 bgt .Ldo_memcmp16 1815 1816 /* 1817 * Now: 1818 * x2: *first string data 1819 * x1: *second string data 1820 * w3: iteration count 1821 * x0: return value if comparison equal 1822 * x4, x5, x6, x7: free 1823 */ 1824 1825 // Do a simple unrolled loop. 1826.Lloop: 1827 // At least two more elements? 1828 subs w3, w3, #2 1829 b.lt .Lremainder_or_done 1830 1831 ldrh w4, [x2], #2 1832 ldrh w5, [x1], #2 1833 1834 ldrh w6, [x2], #2 1835 ldrh w7, [x1], #2 1836 1837 subs w4, w4, w5 1838 b.ne .Lw4_result 1839 1840 subs w6, w6, w7 1841 b.ne .Lw6_result 1842 1843 b .Lloop 1844 1845.Lremainder_or_done: 1846 adds w3, w3, #1 1847 b.eq .Lremainder 1848 ret 1849 1850.Lremainder: 1851 ldrh w4, [x2], #2 1852 ldrh w5, [x1], #2 1853 subs w4, w4, w5 1854 b.ne .Lw4_result 1855 ret 1856 1857// Result is in w4 1858.Lw4_result: 1859 sxtw x0, w4 1860 ret 1861 1862// Result is in w6 1863.Lw6_result: 1864 sxtw x0, w6 1865 ret 1866 1867.Ldo_memcmp16: 1868 mov x14, x0 // Save x0 and LR. __memcmp16 does not use these temps. 1869 mov x15, xLR // TODO: Codify and check that? 1870 1871 mov x0, x2 1872 uxtw x2, w3 1873 bl __memcmp16 1874 1875 mov xLR, x15 // Restore LR. 1876 1877 cmp x0, #0 // Check the memcmp difference. 1878 csel x0, x0, x14, ne // x0 := x0 != 0 ? x14(prev x0=length diff) : x1. 1879 ret 1880END art_quick_string_compareto 1881