quick_entrypoints_arm64.S revision 5ea536aa4a6414db01beaf6f8bd8cb9adc5cfc92
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 ldr wIP0, [xIP0, RUNTIME_SAVE_ALL_CALLEE_SAVE_FRAME_OFFSET ] 36 37 sub sp, sp, #176 38 .cfi_adjust_cfa_offset 176 39 40 // Ugly compile-time check, but we only have the preprocessor. 41#if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVE != 176) 42#error "SAVE_ALL_CALLEE_SAVE_FRAME(ARM64) size not as expected." 43#endif 44 45 // FP callee-saves 46 stp d8, d9, [sp, #8] 47 stp d10, d11, [sp, #24] 48 stp d12, d13, [sp, #40] 49 stp d14, d15, [sp, #56] 50 51 // Thread register and x19 (callee-save) 52 stp xSELF, x19, [sp, #72] 53 .cfi_rel_offset x18, 72 54 .cfi_rel_offset x19, 80 55 56 // callee-saves 57 stp x20, x21, [sp, #88] 58 .cfi_rel_offset x20, 88 59 .cfi_rel_offset x21, 96 60 61 stp x22, x23, [sp, #104] 62 .cfi_rel_offset x22, 104 63 .cfi_rel_offset x23, 112 64 65 stp x24, x25, [sp, #120] 66 .cfi_rel_offset x24, 120 67 .cfi_rel_offset x25, 128 68 69 stp x26, x27, [sp, #136] 70 .cfi_rel_offset x26, 136 71 .cfi_rel_offset x27, 144 72 73 stp x28, x29, [sp, #152] 74 .cfi_rel_offset x28, 152 75 .cfi_rel_offset x29, 160 76 77 str xLR, [sp, #168] 78 .cfi_rel_offset x30, 168 79 80 // Loads appropriate callee-save-method 81 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 82 // Place sp in Thread::Current()->top_quick_frame. 83 mov xIP0, sp 84 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 85.endm 86 87 /* 88 * Macro that sets up the callee save frame to conform with 89 * Runtime::CreateCalleeSaveMethod(kRefsOnly). 90 */ 91.macro SETUP_REFS_ONLY_CALLEE_SAVE_FRAME 92 adrp xIP0, :got:_ZN3art7Runtime9instance_E 93 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 94 95 // Our registers aren't intermixed - just spill in order. 96 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 97 98 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 99 THIS_LOAD_REQUIRES_READ_BARRIER 100 ldr wIP0, [xIP0, RUNTIME_REFS_ONLY_CALLEE_SAVE_FRAME_OFFSET ] 101 102 sub sp, sp, #112 103 .cfi_adjust_cfa_offset 112 104 105 // Ugly compile-time check, but we only have the preprocessor. 106#if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 112) 107#error "REFS_ONLY_CALLEE_SAVE_FRAME(ARM64) size not as expected." 108#endif 109 110 // Callee-saves 111 stp x19, x20, [sp, #16] 112 .cfi_rel_offset x19, 16 113 .cfi_rel_offset x20, 24 114 115 stp x21, x22, [sp, #32] 116 .cfi_rel_offset x21, 32 117 .cfi_rel_offset x22, 40 118 119 stp x23, x24, [sp, #48] 120 .cfi_rel_offset x23, 48 121 .cfi_rel_offset x24, 56 122 123 stp x25, x26, [sp, #64] 124 .cfi_rel_offset x25, 64 125 .cfi_rel_offset x26, 72 126 127 stp x27, x28, [sp, #80] 128 .cfi_rel_offset x27, 80 129 .cfi_rel_offset x28, 88 130 131 // x29(callee-save) and LR 132 stp x29, xLR, [sp, #96] 133 .cfi_rel_offset x29, 96 134 .cfi_rel_offset x30, 104 135 136 // Save xSELF to xETR. 137 mov xETR, xSELF 138 139 // Loads appropriate callee-save-method 140 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsOnly] 141 // Place sp in Thread::Current()->top_quick_frame. 142 mov xIP0, sp 143 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 144.endm 145 146// TODO: Probably no need to restore registers preserved by aapcs64. 147.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 148 // Restore xSELF. 149 mov xSELF, xETR 150 151 // Callee-saves 152 ldp x19, x20, [sp, #16] 153 .cfi_restore x19 154 .cfi_restore x20 155 156 ldp x21, x22, [sp, #32] 157 .cfi_restore x21 158 .cfi_restore x22 159 160 ldp x23, x24, [sp, #48] 161 .cfi_restore x23 162 .cfi_restore x24 163 164 ldp x25, x26, [sp, #64] 165 .cfi_restore x25 166 .cfi_restore x26 167 168 ldp x27, x28, [sp, #80] 169 .cfi_restore x27 170 .cfi_restore x28 171 172 // x29(callee-save) and LR 173 ldp x29, xLR, [sp, #96] 174 .cfi_restore x29 175 .cfi_restore x30 176 177 add sp, sp, #112 178 .cfi_adjust_cfa_offset -112 179.endm 180 181.macro POP_REFS_ONLY_CALLEE_SAVE_FRAME 182 // Restore xSELF as it might be scratched. 183 mov xSELF, xETR 184 // ETR 185 ldr xETR, [sp, #16] 186 .cfi_restore x21 187 188 add sp, sp, #112 189 .cfi_adjust_cfa_offset -112 190.endm 191 192.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 193 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 194 ret 195.endm 196 197 198.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 199 sub sp, sp, #224 200 .cfi_adjust_cfa_offset 224 201 202 // Ugly compile-time check, but we only have the preprocessor. 203#if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 224) 204#error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(ARM64) size not as expected." 205#endif 206 207 // FP args. 208 stp d0, d1, [sp, #8] 209 stp d2, d3, [sp, #24] 210 stp d4, d5, [sp, #40] 211 stp d6, d7, [sp, #56] 212 213 // Core args. 214 str x1, [sp, 72] 215 .cfi_rel_offset x1, 72 216 217 stp x2, x3, [sp, #80] 218 .cfi_rel_offset x2, 80 219 .cfi_rel_offset x3, 88 220 221 stp x4, x5, [sp, #96] 222 .cfi_rel_offset x4, 96 223 .cfi_rel_offset x5, 104 224 225 stp x6, x7, [sp, #112] 226 .cfi_rel_offset x6, 112 227 .cfi_rel_offset x7, 120 228 229 // Callee-saves. 230 stp x19, x20, [sp, #128] 231 .cfi_rel_offset x19, 128 232 .cfi_rel_offset x20, 136 233 234 stp x21, x22, [sp, #144] 235 .cfi_rel_offset x21, 144 236 .cfi_rel_offset x22, 152 237 238 stp x23, x24, [sp, #160] 239 .cfi_rel_offset x23, 160 240 .cfi_rel_offset x24, 168 241 242 stp x25, x26, [sp, #176] 243 .cfi_rel_offset x25, 176 244 .cfi_rel_offset x26, 184 245 246 stp x27, x28, [sp, #192] 247 .cfi_rel_offset x27, 192 248 .cfi_rel_offset x28, 200 249 250 // x29(callee-save) and LR 251 stp x29, xLR, [sp, #208] 252 .cfi_rel_offset x29, 208 253 .cfi_rel_offset x30, 216 254 255 // Save xSELF to xETR. 256 mov xETR, xSELF 257.endm 258 259 /* 260 * Macro that sets up the callee save frame to conform with 261 * Runtime::CreateCalleeSaveMethod(kRefsAndArgs). 262 * 263 * TODO This is probably too conservative - saving FP & LR. 264 */ 265.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 266 adrp xIP0, :got:_ZN3art7Runtime9instance_E 267 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 268 269 // Our registers aren't intermixed - just spill in order. 270 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 271 272 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 273 THIS_LOAD_REQUIRES_READ_BARRIER 274 ldr wIP0, [xIP0, RUNTIME_REFS_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET ] 275 276 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 277 278 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 279 // Place sp in Thread::Current()->top_quick_frame. 280 mov xIP0, sp 281 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 282.endm 283 284.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 285 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 286 str x0, [sp, #0] // Store ArtMethod* to bottom of stack. 287 // Place sp in Thread::Current()->top_quick_frame. 288 mov xIP0, sp 289 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 290.endm 291 292// TODO: Probably no need to restore registers preserved by aapcs64. 293.macro RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 294 // Restore xSELF. 295 mov xSELF, xETR 296 297 // FP args. 298 ldp d0, d1, [sp, #8] 299 ldp d2, d3, [sp, #24] 300 ldp d4, d5, [sp, #40] 301 ldp d6, d7, [sp, #56] 302 303 // Core args. 304 ldr x1, [sp, 72] 305 .cfi_restore x1 306 307 ldp x2, x3, [sp, #80] 308 .cfi_restore x2 309 .cfi_restore x3 310 311 ldp x4, x5, [sp, #96] 312 .cfi_restore x4 313 .cfi_restore x5 314 315 ldp x6, x7, [sp, #112] 316 .cfi_restore x6 317 .cfi_restore x7 318 319 // Callee-saves. 320 ldp x19, x20, [sp, #128] 321 .cfi_restore x19 322 .cfi_restore x20 323 324 ldp x21, x22, [sp, #144] 325 .cfi_restore x21 326 .cfi_restore x22 327 328 ldp x23, x24, [sp, #160] 329 .cfi_restore x23 330 .cfi_restore x24 331 332 ldp x25, x26, [sp, #176] 333 .cfi_restore x25 334 .cfi_restore x26 335 336 ldp x27, x28, [sp, #192] 337 .cfi_restore x27 338 .cfi_restore x28 339 340 // x29(callee-save) and LR 341 ldp x29, xLR, [sp, #208] 342 .cfi_restore x29 343 .cfi_restore x30 344 345 add sp, sp, #224 346 .cfi_adjust_cfa_offset -224 347.endm 348 349.macro RETURN_IF_RESULT_IS_ZERO 350 cbnz x0, 1f // result non-zero branch over 351 ret // return 3521: 353.endm 354 355.macro RETURN_IF_RESULT_IS_NON_ZERO 356 cbz x0, 1f // result zero branch over 357 ret // return 3581: 359.endm 360 361 /* 362 * Macro that set calls through to artDeliverPendingExceptionFromCode, where the pending 363 * exception is Thread::Current()->exception_ 364 */ 365.macro DELIVER_PENDING_EXCEPTION 366 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 367 mov x0, xSELF 368 369 // Point of no return. 370 b artDeliverPendingExceptionFromCode // artDeliverPendingExceptionFromCode(Thread*) 371 brk 0 // Unreached 372.endm 373 374.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_REG reg 375 ldr \reg, [xSELF, # THREAD_EXCEPTION_OFFSET] // Get exception field. 376 cbnz \reg, 1f 377 ret 3781: 379 DELIVER_PENDING_EXCEPTION 380.endm 381 382.macro RETURN_OR_DELIVER_PENDING_EXCEPTION 383 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG xIP0 384.endm 385 386// Same as above with x1. This is helpful in stubs that want to avoid clobbering another register. 387.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 388 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG x1 389.endm 390 391.macro RETURN_IF_W0_IS_ZERO_OR_DELIVER 392 cbnz w0, 1f // result non-zero branch over 393 ret // return 3941: 395 DELIVER_PENDING_EXCEPTION 396.endm 397 398.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 399 .extern \cxx_name 400ENTRY \c_name 401 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 402 mov x0, xSELF // pass Thread::Current 403 b \cxx_name // \cxx_name(Thread*) 404END \c_name 405.endm 406 407.macro ONE_ARG_RUNTIME_EXCEPTION c_name, cxx_name 408 .extern \cxx_name 409ENTRY \c_name 410 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context. 411 mov x1, xSELF // pass Thread::Current. 412 b \cxx_name // \cxx_name(arg, Thread*). 413 brk 0 414END \c_name 415.endm 416 417.macro TWO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 418 .extern \cxx_name 419ENTRY \c_name 420 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 421 mov x2, xSELF // pass Thread::Current 422 b \cxx_name // \cxx_name(arg1, arg2, Thread*) 423 brk 0 424END \c_name 425.endm 426 427 /* 428 * Called by managed code, saves callee saves and then calls artThrowException 429 * that will place a mock Method* at the bottom of the stack. Arg1 holds the exception. 430 */ 431ONE_ARG_RUNTIME_EXCEPTION art_quick_deliver_exception, artDeliverExceptionFromCode 432 433 /* 434 * Called by managed code to create and deliver a NullPointerException. 435 */ 436NO_ARG_RUNTIME_EXCEPTION art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode 437 438 /* 439 * Called by managed code to create and deliver an ArithmeticException. 440 */ 441NO_ARG_RUNTIME_EXCEPTION art_quick_throw_div_zero, artThrowDivZeroFromCode 442 443 /* 444 * Called by managed code to create and deliver an ArrayIndexOutOfBoundsException. Arg1 holds 445 * index, arg2 holds limit. 446 */ 447TWO_ARG_RUNTIME_EXCEPTION art_quick_throw_array_bounds, artThrowArrayBoundsFromCode 448 449 /* 450 * Called by managed code to create and deliver a StackOverflowError. 451 */ 452NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode 453 454 /* 455 * Called by managed code to create and deliver a NoSuchMethodError. 456 */ 457ONE_ARG_RUNTIME_EXCEPTION art_quick_throw_no_such_method, artThrowNoSuchMethodFromCode 458 459 /* 460 * All generated callsites for interface invokes and invocation slow paths will load arguments 461 * as usual - except instead of loading arg0/x0 with the target Method*, arg0/x0 will contain 462 * the method_idx. This wrapper will save arg1-arg3, load the caller's Method*, align the 463 * stack and call the appropriate C helper. 464 * NOTE: "this" is first visible argument of the target, and so can be found in arg1/x1. 465 * 466 * The helper will attempt to locate the target and return a 128-bit result in x0/x1 consisting 467 * of the target Method* in x0 and method->code_ in x1. 468 * 469 * If unsuccessful, the helper will return null/????. There will be a pending exception in the 470 * thread and we branch to another stub to deliver it. 471 * 472 * On success this wrapper will restore arguments and *jump* to the target, leaving the lr 473 * pointing back to the original caller. 474 * 475 * Adapted from ARM32 code. 476 * 477 * Clobbers xIP0. 478 */ 479.macro INVOKE_TRAMPOLINE c_name, cxx_name 480 .extern \cxx_name 481ENTRY \c_name 482 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME // save callee saves in case allocation triggers GC 483 // Helper signature is always 484 // (method_idx, *this_object, *caller_method, *self, sp) 485 486 ldr w2, [sp, #FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE] // pass caller Method* 487 mov x3, xSELF // pass Thread::Current 488 mov x4, sp 489 bl \cxx_name // (method_idx, this, caller, Thread*, SP) 490 mov xIP0, x1 // save Method*->code_ 491 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 492 cbz x0, 1f // did we find the target? if not go to exception delivery 493 br xIP0 // tail call to target 4941: 495 DELIVER_PENDING_EXCEPTION 496END \c_name 497.endm 498 499INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline, artInvokeInterfaceTrampoline 500INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline_with_access_check, artInvokeInterfaceTrampolineWithAccessCheck 501 502INVOKE_TRAMPOLINE art_quick_invoke_static_trampoline_with_access_check, artInvokeStaticTrampolineWithAccessCheck 503INVOKE_TRAMPOLINE art_quick_invoke_direct_trampoline_with_access_check, artInvokeDirectTrampolineWithAccessCheck 504INVOKE_TRAMPOLINE art_quick_invoke_super_trampoline_with_access_check, artInvokeSuperTrampolineWithAccessCheck 505INVOKE_TRAMPOLINE art_quick_invoke_virtual_trampoline_with_access_check, artInvokeVirtualTrampolineWithAccessCheck 506 507 508.macro INVOKE_STUB_CREATE_FRAME 509 510SAVE_SIZE=15*8 // x4, x5, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, SP, LR, FP saved. 511SAVE_SIZE_AND_METHOD=SAVE_SIZE+STACK_REFERENCE_SIZE 512 513 514 mov x9, sp // Save stack pointer. 515 .cfi_register sp,x9 516 517 add x10, x2, # SAVE_SIZE_AND_METHOD // calculate size of frame. 518 sub x10, sp, x10 // Calculate SP position - saves + ArtMethod* + args 519 and x10, x10, # ~0xf // Enforce 16 byte stack alignment. 520 mov sp, x10 // Set new SP. 521 522 sub x10, x9, #SAVE_SIZE // Calculate new FP (later). Done here as we must move SP 523 .cfi_def_cfa_register x10 // before this. 524 .cfi_adjust_cfa_offset SAVE_SIZE 525 526 str x28, [x10, #112] 527 .cfi_rel_offset x28, 112 528 529 stp x26, x27, [x10, #96] 530 .cfi_rel_offset x26, 96 531 .cfi_rel_offset x27, 104 532 533 stp x24, x25, [x10, #80] 534 .cfi_rel_offset x24, 80 535 .cfi_rel_offset x25, 88 536 537 stp x22, x23, [x10, #64] 538 .cfi_rel_offset x22, 64 539 .cfi_rel_offset x23, 72 540 541 stp x20, x21, [x10, #48] 542 .cfi_rel_offset x20, 48 543 .cfi_rel_offset x21, 56 544 545 stp x9, x19, [x10, #32] // Save old stack pointer and x19. 546 .cfi_rel_offset sp, 32 547 .cfi_rel_offset x19, 40 548 549 stp x4, x5, [x10, #16] // Save result and shorty addresses. 550 .cfi_rel_offset x4, 16 551 .cfi_rel_offset x5, 24 552 553 stp xFP, xLR, [x10] // Store LR & FP. 554 .cfi_rel_offset x29, 0 555 .cfi_rel_offset x30, 8 556 557 mov xFP, x10 // Use xFP now, as it's callee-saved. 558 .cfi_def_cfa_register x29 559 mov xSELF, x3 // Move thread pointer into SELF register. 560 561 // Copy arguments into stack frame. 562 // Use simple copy routine for now. 563 // 4 bytes per slot. 564 // X1 - source address 565 // W2 - args length 566 // X9 - destination address. 567 // W10 - temporary 568 add x9, sp, #4 // Destination address is bottom of stack + null. 569 570 // Use \@ to differentiate between macro invocations. 571.LcopyParams\@: 572 cmp w2, #0 573 beq .LendCopyParams\@ 574 sub w2, w2, #4 // Need 65536 bytes of range. 575 ldr w10, [x1, x2] 576 str w10, [x9, x2] 577 578 b .LcopyParams\@ 579 580.LendCopyParams\@: 581 582 // Store null into StackReference<Method>* at bottom of frame. 583 str wzr, [sp] 584 585#if (STACK_REFERENCE_SIZE != 4) 586#error "STACK_REFERENCE_SIZE(ARM64) size not as expected." 587#endif 588.endm 589 590.macro INVOKE_STUB_CALL_AND_RETURN 591 592 // load method-> METHOD_QUICK_CODE_OFFSET 593 ldr x9, [x0 , #MIRROR_ART_METHOD_QUICK_CODE_OFFSET_64] 594 // Branch to method. 595 blr x9 596 597 // Restore return value address and shorty address. 598 ldp x4,x5, [xFP, #16] 599 .cfi_restore x4 600 .cfi_restore x5 601 602 ldr x28, [xFP, #112] 603 .cfi_restore x28 604 605 ldp x26, x27, [xFP, #96] 606 .cfi_restore x26 607 .cfi_restore x27 608 609 ldp x24, x25, [xFP, #80] 610 .cfi_restore x24 611 .cfi_restore x25 612 613 ldp x22, x23, [xFP, #64] 614 .cfi_restore x22 615 .cfi_restore x23 616 617 ldp x20, x21, [xFP, #48] 618 .cfi_restore x20 619 .cfi_restore x21 620 621 // Store result (w0/x0/s0/d0) appropriately, depending on resultType. 622 ldrb w10, [x5] 623 624 // Don't set anything for a void type. 625 cmp w10, #'V' 626 beq .Lexit_art_quick_invoke_stub\@ 627 628 cmp w10, #'D' 629 bne .Lreturn_is_float\@ 630 str d0, [x4] 631 b .Lexit_art_quick_invoke_stub\@ 632 633.Lreturn_is_float\@: 634 cmp w10, #'F' 635 bne .Lreturn_is_int\@ 636 str s0, [x4] 637 b .Lexit_art_quick_invoke_stub\@ 638 639 // Just store x0. Doesn't matter if it is 64 or 32 bits. 640.Lreturn_is_int\@: 641 str x0, [x4] 642 643.Lexit_art_quick_invoke_stub\@: 644 ldp x2, x19, [xFP, #32] // Restore stack pointer and x19. 645 .cfi_restore x19 646 mov sp, x2 647 .cfi_restore sp 648 649 ldp xFP, xLR, [xFP] // Restore old frame pointer and link register. 650 .cfi_restore x29 651 .cfi_restore x30 652 653 ret 654 655.endm 656 657 658/* 659 * extern"C" void art_quick_invoke_stub(ArtMethod *method, x0 660 * uint32_t *args, x1 661 * uint32_t argsize, w2 662 * Thread *self, x3 663 * JValue *result, x4 664 * char *shorty); x5 665 * +----------------------+ 666 * | | 667 * | C/C++ frame | 668 * | LR'' | 669 * | FP'' | <- SP' 670 * +----------------------+ 671 * +----------------------+ 672 * | x28 | <- TODO: Remove callee-saves. 673 * | : | 674 * | x19 | 675 * | SP' | 676 * | X5 | 677 * | X4 | Saved registers 678 * | LR' | 679 * | FP' | <- FP 680 * +----------------------+ 681 * | uint32_t out[n-1] | 682 * | : : | Outs 683 * | uint32_t out[0] | 684 * | StackRef<ArtMethod> | <- SP value=null 685 * +----------------------+ 686 * 687 * Outgoing registers: 688 * x0 - Method* 689 * x1-x7 - integer parameters. 690 * d0-d7 - Floating point parameters. 691 * xSELF = self 692 * SP = & of ArtMethod* 693 * x1 = "this" pointer. 694 * 695 */ 696ENTRY art_quick_invoke_stub 697 // Spill registers as per AACPS64 calling convention. 698 INVOKE_STUB_CREATE_FRAME 699 700 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 701 // Parse the passed shorty to determine which register to load. 702 // Load addresses for routines that load WXSD registers. 703 adr x11, .LstoreW2 704 adr x12, .LstoreX2 705 adr x13, .LstoreS0 706 adr x14, .LstoreD0 707 708 // Initialize routine offsets to 0 for integers and floats. 709 // x8 for integers, x15 for floating point. 710 mov x8, #0 711 mov x15, #0 712 713 add x10, x5, #1 // Load shorty address, plus one to skip return value. 714 ldr w1, [x9],#4 // Load "this" parameter, and increment arg pointer. 715 716 // Loop to fill registers. 717.LfillRegisters: 718 ldrb w17, [x10], #1 // Load next character in signature, and increment. 719 cbz w17, .LcallFunction // Exit at end of signature. Shorty 0 terminated. 720 721 cmp w17, #'F' // is this a float? 722 bne .LisDouble 723 724 cmp x15, # 8*12 // Skip this load if all registers full. 725 beq .Ladvance4 726 727 add x17, x13, x15 // Calculate subroutine to jump to. 728 br x17 729 730.LisDouble: 731 cmp w17, #'D' // is this a double? 732 bne .LisLong 733 734 cmp x15, # 8*12 // Skip this load if all registers full. 735 beq .Ladvance8 736 737 add x17, x14, x15 // Calculate subroutine to jump to. 738 br x17 739 740.LisLong: 741 cmp w17, #'J' // is this a long? 742 bne .LisOther 743 744 cmp x8, # 6*12 // Skip this load if all registers full. 745 beq .Ladvance8 746 747 add x17, x12, x8 // Calculate subroutine to jump to. 748 br x17 749 750.LisOther: // Everything else takes one vReg. 751 cmp x8, # 6*12 // Skip this load if all registers full. 752 beq .Ladvance4 753 754 add x17, x11, x8 // Calculate subroutine to jump to. 755 br x17 756 757.Ladvance4: 758 add x9, x9, #4 759 b .LfillRegisters 760 761.Ladvance8: 762 add x9, x9, #8 763 b .LfillRegisters 764 765// Macro for loading a parameter into a register. 766// counter - the register with offset into these tables 767// size - the size of the register - 4 or 8 bytes. 768// register - the name of the register to be loaded. 769.macro LOADREG counter size register return 770 ldr \register , [x9], #\size 771 add \counter, \counter, 12 772 b \return 773.endm 774 775// Store ints. 776.LstoreW2: 777 LOADREG x8 4 w2 .LfillRegisters 778 LOADREG x8 4 w3 .LfillRegisters 779 LOADREG x8 4 w4 .LfillRegisters 780 LOADREG x8 4 w5 .LfillRegisters 781 LOADREG x8 4 w6 .LfillRegisters 782 LOADREG x8 4 w7 .LfillRegisters 783 784// Store longs. 785.LstoreX2: 786 LOADREG x8 8 x2 .LfillRegisters 787 LOADREG x8 8 x3 .LfillRegisters 788 LOADREG x8 8 x4 .LfillRegisters 789 LOADREG x8 8 x5 .LfillRegisters 790 LOADREG x8 8 x6 .LfillRegisters 791 LOADREG x8 8 x7 .LfillRegisters 792 793// Store singles. 794.LstoreS0: 795 LOADREG x15 4 s0 .LfillRegisters 796 LOADREG x15 4 s1 .LfillRegisters 797 LOADREG x15 4 s2 .LfillRegisters 798 LOADREG x15 4 s3 .LfillRegisters 799 LOADREG x15 4 s4 .LfillRegisters 800 LOADREG x15 4 s5 .LfillRegisters 801 LOADREG x15 4 s6 .LfillRegisters 802 LOADREG x15 4 s7 .LfillRegisters 803 804// Store doubles. 805.LstoreD0: 806 LOADREG x15 8 d0 .LfillRegisters 807 LOADREG x15 8 d1 .LfillRegisters 808 LOADREG x15 8 d2 .LfillRegisters 809 LOADREG x15 8 d3 .LfillRegisters 810 LOADREG x15 8 d4 .LfillRegisters 811 LOADREG x15 8 d5 .LfillRegisters 812 LOADREG x15 8 d6 .LfillRegisters 813 LOADREG x15 8 d7 .LfillRegisters 814 815 816.LcallFunction: 817 818 INVOKE_STUB_CALL_AND_RETURN 819 820END art_quick_invoke_stub 821 822/* extern"C" 823 * void art_quick_invoke_static_stub(ArtMethod *method, x0 824 * uint32_t *args, x1 825 * uint32_t argsize, w2 826 * Thread *self, x3 827 * JValue *result, x4 828 * char *shorty); x5 829 */ 830ENTRY art_quick_invoke_static_stub 831 // Spill registers as per AACPS64 calling convention. 832 INVOKE_STUB_CREATE_FRAME 833 834 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 835 // Parse the passed shorty to determine which register to load. 836 // Load addresses for routines that load WXSD registers. 837 adr x11, .LstoreW1_2 838 adr x12, .LstoreX1_2 839 adr x13, .LstoreS0_2 840 adr x14, .LstoreD0_2 841 842 // Initialize routine offsets to 0 for integers and floats. 843 // x8 for integers, x15 for floating point. 844 mov x8, #0 845 mov x15, #0 846 847 add x10, x5, #1 // Load shorty address, plus one to skip return value. 848 849 // Loop to fill registers. 850.LfillRegisters2: 851 ldrb w17, [x10], #1 // Load next character in signature, and increment. 852 cbz w17, .LcallFunction2 // Exit at end of signature. Shorty 0 terminated. 853 854 cmp w17, #'F' // is this a float? 855 bne .LisDouble2 856 857 cmp x15, # 8*12 // Skip this load if all registers full. 858 beq .Ladvance4_2 859 860 add x17, x13, x15 // Calculate subroutine to jump to. 861 br x17 862 863.LisDouble2: 864 cmp w17, #'D' // is this a double? 865 bne .LisLong2 866 867 cmp x15, # 8*12 // Skip this load if all registers full. 868 beq .Ladvance8_2 869 870 add x17, x14, x15 // Calculate subroutine to jump to. 871 br x17 872 873.LisLong2: 874 cmp w17, #'J' // is this a long? 875 bne .LisOther2 876 877 cmp x8, # 7*12 // Skip this load if all registers full. 878 beq .Ladvance8_2 879 880 add x17, x12, x8 // Calculate subroutine to jump to. 881 br x17 882 883.LisOther2: // Everything else takes one vReg. 884 cmp x8, # 7*12 // Skip this load if all registers full. 885 beq .Ladvance4_2 886 887 add x17, x11, x8 // Calculate subroutine to jump to. 888 br x17 889 890.Ladvance4_2: 891 add x9, x9, #4 892 b .LfillRegisters2 893 894.Ladvance8_2: 895 add x9, x9, #8 896 b .LfillRegisters2 897 898// Store ints. 899.LstoreW1_2: 900 LOADREG x8 4 w1 .LfillRegisters2 901 LOADREG x8 4 w2 .LfillRegisters2 902 LOADREG x8 4 w3 .LfillRegisters2 903 LOADREG x8 4 w4 .LfillRegisters2 904 LOADREG x8 4 w5 .LfillRegisters2 905 LOADREG x8 4 w6 .LfillRegisters2 906 LOADREG x8 4 w7 .LfillRegisters2 907 908// Store longs. 909.LstoreX1_2: 910 LOADREG x8 8 x1 .LfillRegisters2 911 LOADREG x8 8 x2 .LfillRegisters2 912 LOADREG x8 8 x3 .LfillRegisters2 913 LOADREG x8 8 x4 .LfillRegisters2 914 LOADREG x8 8 x5 .LfillRegisters2 915 LOADREG x8 8 x6 .LfillRegisters2 916 LOADREG x8 8 x7 .LfillRegisters2 917 918// Store singles. 919.LstoreS0_2: 920 LOADREG x15 4 s0 .LfillRegisters2 921 LOADREG x15 4 s1 .LfillRegisters2 922 LOADREG x15 4 s2 .LfillRegisters2 923 LOADREG x15 4 s3 .LfillRegisters2 924 LOADREG x15 4 s4 .LfillRegisters2 925 LOADREG x15 4 s5 .LfillRegisters2 926 LOADREG x15 4 s6 .LfillRegisters2 927 LOADREG x15 4 s7 .LfillRegisters2 928 929// Store doubles. 930.LstoreD0_2: 931 LOADREG x15 8 d0 .LfillRegisters2 932 LOADREG x15 8 d1 .LfillRegisters2 933 LOADREG x15 8 d2 .LfillRegisters2 934 LOADREG x15 8 d3 .LfillRegisters2 935 LOADREG x15 8 d4 .LfillRegisters2 936 LOADREG x15 8 d5 .LfillRegisters2 937 LOADREG x15 8 d6 .LfillRegisters2 938 LOADREG x15 8 d7 .LfillRegisters2 939 940 941.LcallFunction2: 942 943 INVOKE_STUB_CALL_AND_RETURN 944 945END art_quick_invoke_static_stub 946 947 948 949 /* 950 * On entry x0 is uintptr_t* gprs_ and x1 is uint64_t* fprs_ 951 */ 952 953ENTRY art_quick_do_long_jump 954 // Load FPRs 955 ldp d0, d1, [x1], #16 956 ldp d2, d3, [x1], #16 957 ldp d4, d5, [x1], #16 958 ldp d6, d7, [x1], #16 959 ldp d8, d9, [x1], #16 960 ldp d10, d11, [x1], #16 961 ldp d12, d13, [x1], #16 962 ldp d14, d15, [x1], #16 963 ldp d16, d17, [x1], #16 964 ldp d18, d19, [x1], #16 965 ldp d20, d21, [x1], #16 966 ldp d22, d23, [x1], #16 967 ldp d24, d25, [x1], #16 968 ldp d26, d27, [x1], #16 969 ldp d28, d29, [x1], #16 970 ldp d30, d31, [x1] 971 972 // Load GPRs 973 // TODO: lots of those are smashed, could optimize. 974 add x0, x0, #30*8 975 ldp x30, x1, [x0], #-16 976 ldp x28, x29, [x0], #-16 977 ldp x26, x27, [x0], #-16 978 ldp x24, x25, [x0], #-16 979 ldp x22, x23, [x0], #-16 980 ldp x20, x21, [x0], #-16 981 ldp x18, x19, [x0], #-16 982 ldp x16, x17, [x0], #-16 983 ldp x14, x15, [x0], #-16 984 ldp x12, x13, [x0], #-16 985 ldp x10, x11, [x0], #-16 986 ldp x8, x9, [x0], #-16 987 ldp x6, x7, [x0], #-16 988 ldp x4, x5, [x0], #-16 989 ldp x2, x3, [x0], #-16 990 mov sp, x1 991 992 // TODO: Is it really OK to use LR for the target PC? 993 mov x0, #0 994 mov x1, #0 995 br xLR 996END art_quick_do_long_jump 997 998 /* 999 * Entry from managed code that calls artLockObjectFromCode, may block for GC. x0 holds the 1000 * possibly null object to lock. 1001 * 1002 * Derived from arm32 code. 1003 */ 1004 .extern artLockObjectFromCode 1005ENTRY art_quick_lock_object 1006 cbz w0, .Lslow_lock 1007 add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore 1008.Lretry_lock: 1009 ldr w2, [xSELF, #THREAD_ID_OFFSET] // TODO: Can the thread ID really change during the loop? 1010 ldxr w1, [x4] 1011 mov x3, x1 1012 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1013 cbnz w3, .Lnot_unlocked // already thin locked 1014 // unlocked case - x1: original lock word that's zero except for the read barrier bits. 1015 orr x2, x1, x2 // x2 holds thread id with count of 0 with preserved read barrier bits 1016 stxr w3, w2, [x4] 1017 cbnz w3, .Llock_stxr_fail // store failed, retry 1018 dmb ishld // full (LoadLoad|LoadStore) memory barrier 1019 ret 1020.Lnot_unlocked: // x1: original lock word 1021 lsr w3, w1, LOCK_WORD_STATE_SHIFT 1022 cbnz w3, .Lslow_lock // if either of the top two bits are set, go slow path 1023 eor w2, w1, w2 // lock_word.ThreadId() ^ self->ThreadId() 1024 uxth w2, w2 // zero top 16 bits 1025 cbnz w2, .Lslow_lock // lock word and self thread id's match -> recursive lock 1026 // else contention, go to slow path 1027 mov x3, x1 // copy the lock word to check count overflow. 1028 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits. 1029 add w2, w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count in lock word placing in w2 to check overflow 1030 lsr w3, w2, LOCK_WORD_READ_BARRIER_STATE_SHIFT // if either of the upper two bits (28-29) are set, we overflowed. 1031 cbnz w3, .Lslow_lock // if we overflow the count go slow path 1032 add w2, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count for real 1033 stxr w3, w2, [x4] 1034 cbnz w3, .Llock_stxr_fail // store failed, retry 1035 ret 1036.Llock_stxr_fail: 1037 b .Lretry_lock // retry 1038.Lslow_lock: 1039 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case we block 1040 mov x1, xSELF // pass Thread::Current 1041 bl artLockObjectFromCode // (Object* obj, Thread*) 1042 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1043 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1044END art_quick_lock_object 1045 1046 /* 1047 * Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure. 1048 * x0 holds the possibly null object to lock. 1049 * 1050 * Derived from arm32 code. 1051 */ 1052 .extern artUnlockObjectFromCode 1053ENTRY art_quick_unlock_object 1054 cbz x0, .Lslow_unlock 1055 add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore 1056.Lretry_unlock: 1057#ifndef USE_READ_BARRIER 1058 ldr w1, [x4] 1059#else 1060 ldxr w1, [x4] // Need to use atomic instructions for read barrier 1061#endif 1062 lsr w2, w1, LOCK_WORD_STATE_SHIFT 1063 cbnz w2, .Lslow_unlock // if either of the top two bits are set, go slow path 1064 ldr w2, [xSELF, #THREAD_ID_OFFSET] 1065 mov x3, x1 // copy lock word to check thread id equality 1066 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1067 eor w3, w3, w2 // lock_word.ThreadId() ^ self->ThreadId() 1068 uxth w3, w3 // zero top 16 bits 1069 cbnz w3, .Lslow_unlock // do lock word and self thread id's match? 1070 mov x3, x1 // copy lock word to detect transition to unlocked 1071 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1072 cmp w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE 1073 bpl .Lrecursive_thin_unlock 1074 // transition to unlocked 1075 mov x3, x1 1076 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK // w3: zero except for the preserved read barrier bits 1077 dmb ish // full (LoadStore|StoreStore) memory barrier 1078#ifndef USE_READ_BARRIER 1079 str w3, [x4] 1080#else 1081 stxr w2, w3, [x4] // Need to use atomic instructions for read barrier 1082 cbnz w2, .Lunlock_stxr_fail // store failed, retry 1083#endif 1084 ret 1085.Lrecursive_thin_unlock: // w1: original lock word 1086 sub w1, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // decrement count 1087#ifndef USE_READ_BARRIER 1088 str w1, [x4] 1089#else 1090 stxr w2, w1, [x4] // Need to use atomic instructions for read barrier 1091 cbnz w2, .Lunlock_stxr_fail // store failed, retry 1092#endif 1093 ret 1094.Lunlock_stxr_fail: 1095 b .Lretry_unlock // retry 1096.Lslow_unlock: 1097 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case exception allocation triggers GC 1098 mov x1, xSELF // pass Thread::Current 1099 bl artUnlockObjectFromCode // (Object* obj, Thread*) 1100 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1101 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1102END art_quick_unlock_object 1103 1104 /* 1105 * Entry from managed code that calls artIsAssignableFromCode and on failure calls 1106 * artThrowClassCastException. 1107 */ 1108 .extern artThrowClassCastException 1109ENTRY art_quick_check_cast 1110 // Store arguments and link register 1111 sub sp, sp, #32 // Stack needs to be 16b aligned on calls 1112 .cfi_adjust_cfa_offset 32 1113 stp x0, x1, [sp] 1114 .cfi_rel_offset x0, 0 1115 .cfi_rel_offset x1, 8 1116 stp xSELF, xLR, [sp, #16] 1117 .cfi_rel_offset x18, 16 1118 .cfi_rel_offset x30, 24 1119 1120 // Call runtime code 1121 bl artIsAssignableFromCode 1122 1123 // Check for exception 1124 cbz x0, .Lthrow_class_cast_exception 1125 1126 // Restore and return 1127 ldp x0, x1, [sp] 1128 .cfi_restore x0 1129 .cfi_restore x1 1130 ldp xSELF, xLR, [sp, #16] 1131 .cfi_restore x18 1132 .cfi_restore x30 1133 add sp, sp, #32 1134 .cfi_adjust_cfa_offset -32 1135 ret 1136 1137.Lthrow_class_cast_exception: 1138 // Restore 1139 ldp x0, x1, [sp] 1140 .cfi_restore x0 1141 .cfi_restore x1 1142 ldp xSELF, xLR, [sp, #16] 1143 .cfi_restore x18 1144 .cfi_restore x30 1145 add sp, sp, #32 1146 .cfi_adjust_cfa_offset -32 1147 1148 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 1149 mov x2, xSELF // pass Thread::Current 1150 b artThrowClassCastException // (Class*, Class*, Thread*) 1151 brk 0 // We should not return here... 1152END art_quick_check_cast 1153 1154 /* 1155 * Entry from managed code for array put operations of objects where the value being stored 1156 * needs to be checked for compatibility. 1157 * x0 = array, x1 = index, x2 = value 1158 * 1159 * Currently all values should fit into w0/w1/w2, and w1 always will as indices are 32b. We 1160 * assume, though, that the upper 32b are zeroed out. At least for x1/w1 we can do better by 1161 * using index-zero-extension in load/stores. 1162 * 1163 * Temporaries: x3, x4 1164 * TODO: x4 OK? ip seems wrong here. 1165 */ 1166ENTRY art_quick_aput_obj_with_null_and_bound_check 1167 tst x0, x0 1168 bne art_quick_aput_obj_with_bound_check 1169 b art_quick_throw_null_pointer_exception 1170END art_quick_aput_obj_with_null_and_bound_check 1171 1172ENTRY art_quick_aput_obj_with_bound_check 1173 ldr w3, [x0, #MIRROR_ARRAY_LENGTH_OFFSET] 1174 cmp w3, w1 1175 bhi art_quick_aput_obj 1176 mov x0, x1 1177 mov x1, x3 1178 b art_quick_throw_array_bounds 1179END art_quick_aput_obj_with_bound_check 1180 1181ENTRY art_quick_aput_obj 1182 cbz x2, .Ldo_aput_null 1183 ldr w3, [x0, #MIRROR_OBJECT_CLASS_OFFSET] // Heap reference = 32b 1184 // This also zero-extends to x3 1185 ldr w4, [x2, #MIRROR_OBJECT_CLASS_OFFSET] // Heap reference = 32b 1186 // This also zero-extends to x4 1187 ldr w3, [x3, #MIRROR_CLASS_COMPONENT_TYPE_OFFSET] // Heap reference = 32b 1188 // This also zero-extends to x3 1189 cmp w3, w4 // value's type == array's component type - trivial assignability 1190 bne .Lcheck_assignability 1191.Ldo_aput: 1192 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1193 // "Compress" = do nothing 1194 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1195 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1196 lsr x0, x0, #7 1197 strb w3, [x3, x0] 1198 ret 1199.Ldo_aput_null: 1200 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1201 // "Compress" = do nothing 1202 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1203 ret 1204.Lcheck_assignability: 1205 // Store arguments and link register 1206 sub sp, sp, #48 // Stack needs to be 16b aligned on calls 1207 .cfi_adjust_cfa_offset 48 1208 stp x0, x1, [sp] 1209 .cfi_rel_offset x0, 0 1210 .cfi_rel_offset x1, 8 1211 stp x2, xSELF, [sp, #16] 1212 .cfi_rel_offset x2, 16 1213 .cfi_rel_offset x18, 24 1214 str xLR, [sp, #32] 1215 .cfi_rel_offset x30, 32 1216 1217 // Call runtime code 1218 mov x0, x3 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1219 mov x1, x4 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1220 bl artIsAssignableFromCode 1221 1222 // Check for exception 1223 cbz x0, .Lthrow_array_store_exception 1224 1225 // Restore 1226 ldp x0, x1, [sp] 1227 .cfi_restore x0 1228 .cfi_restore x1 1229 ldp x2, xSELF, [sp, #16] 1230 .cfi_restore x2 1231 .cfi_restore x18 1232 ldr xLR, [sp, #32] 1233 .cfi_restore x30 1234 add sp, sp, #48 1235 .cfi_adjust_cfa_offset -48 1236 1237 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1238 // "Compress" = do nothing 1239 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1240 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1241 lsr x0, x0, #7 1242 strb w3, [x3, x0] 1243 ret 1244.Lthrow_array_store_exception: 1245 ldp x0, x1, [sp] 1246 .cfi_restore x0 1247 .cfi_restore x1 1248 ldp x2, xSELF, [sp, #16] 1249 .cfi_restore x2 1250 .cfi_restore x18 1251 ldr xLR, [sp, #32] 1252 .cfi_restore x30 1253 add sp, sp, #48 1254 .cfi_adjust_cfa_offset -48 1255 1256 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1257 mov x1, x2 // Pass value. 1258 mov x2, xSELF // Pass Thread::Current. 1259 b artThrowArrayStoreException // (Object*, Object*, Thread*). 1260 brk 0 // Unreached. 1261END art_quick_aput_obj 1262 1263// Macro to facilitate adding new allocation entrypoints. 1264.macro ONE_ARG_DOWNCALL name, entrypoint, return 1265 .extern \entrypoint 1266ENTRY \name 1267 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1268 mov x1, xSELF // pass Thread::Current 1269 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*) 1270 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1271 \return 1272END \name 1273.endm 1274 1275// Macro to facilitate adding new allocation entrypoints. 1276.macro TWO_ARG_DOWNCALL name, entrypoint, return 1277 .extern \entrypoint 1278ENTRY \name 1279 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1280 mov x2, xSELF // pass Thread::Current 1281 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*) 1282 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1283 \return 1284END \name 1285.endm 1286 1287// Macro to facilitate adding new array allocation entrypoints. 1288.macro THREE_ARG_DOWNCALL name, entrypoint, return 1289 .extern \entrypoint 1290ENTRY \name 1291 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 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// Macros taking opportunity of code similarities for downcalls with referrer. 1300.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return 1301 .extern \entrypoint 1302ENTRY \name 1303 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1304 ldr w1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1305 mov x2, xSELF // pass Thread::Current 1306 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP) 1307 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1308 \return 1309END \name 1310.endm 1311 1312.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return 1313 .extern \entrypoint 1314ENTRY \name 1315 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1316 ldr w2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1317 mov x3, xSELF // pass Thread::Current 1318 bl \entrypoint 1319 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1320 \return 1321END \name 1322.endm 1323 1324.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return 1325 .extern \entrypoint 1326ENTRY \name 1327 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1328 ldr w3, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1329 mov x4, xSELF // pass Thread::Current 1330 bl \entrypoint 1331 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1332 \return 1333END \name 1334.endm 1335 1336.macro RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1337 cbz w0, 1f // result zero branch over 1338 ret // return 13391: 1340 DELIVER_PENDING_EXCEPTION 1341.endm 1342 1343 /* 1344 * Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on 1345 * failure. 1346 */ 1347TWO_ARG_REF_DOWNCALL art_quick_handle_fill_data, artHandleFillArrayDataFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1348 1349 /* 1350 * Entry from managed code when uninitialized static storage, this stub will run the class 1351 * initializer and deliver the exception on error. On success the static storage base is 1352 * returned. 1353 */ 1354ONE_ARG_DOWNCALL art_quick_initialize_static_storage, artInitializeStaticStorageFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1355 1356ONE_ARG_DOWNCALL art_quick_initialize_type, artInitializeTypeFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1357ONE_ARG_DOWNCALL art_quick_initialize_type_and_verify_access, artInitializeTypeAndVerifyAccessFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1358 1359ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1360ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1361ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1362ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1363ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1364ONE_ARG_REF_DOWNCALL art_quick_get64_static, artGet64StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1365ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1366 1367TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1368TWO_ARG_REF_DOWNCALL art_quick_get_byte_instance, artGetByteInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1369TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1370TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1371TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1372TWO_ARG_REF_DOWNCALL art_quick_get64_instance, artGet64InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1373TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1374 1375TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1376TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1377TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1378TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1379 1380THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1381THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1382THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1383THREE_ARG_REF_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1384THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1385 1386// This is separated out as the argument order is different. 1387 .extern artSet64StaticFromCode 1388ENTRY art_quick_set64_static 1389 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1390 mov x3, x1 // Store value 1391 ldr w1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1392 mov x2, x3 // Put value param 1393 mov x3, xSELF // pass Thread::Current 1394 bl artSet64StaticFromCode 1395 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1396 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1397END art_quick_set64_static 1398 1399 /* 1400 * Entry from managed code to resolve a string, this stub will allocate a String and deliver an 1401 * exception on error. On success the String is returned. w0 holds the string index. The fast 1402 * path check for hit in strings cache has already been performed. 1403 */ 1404ONE_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1405 1406// Generate the allocation entrypoints for each allocator. 1407GENERATE_ALL_ALLOC_ENTRYPOINTS 1408 1409 /* 1410 * Called by managed code when the thread has been asked to suspend. 1411 */ 1412 .extern artTestSuspendFromCode 1413ENTRY art_quick_test_suspend 1414 ldrh w0, [xSELF, #THREAD_FLAGS_OFFSET] // get xSELF->state_and_flags.as_struct.flags 1415 cbnz w0, .Lneed_suspend // check flags == 0 1416 ret // return if flags == 0 1417.Lneed_suspend: 1418 mov x0, xSELF 1419 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1420 bl artTestSuspendFromCode // (Thread*) 1421 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1422END art_quick_test_suspend 1423 1424ENTRY art_quick_implicit_suspend 1425 mov x0, xSELF 1426 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1427 bl artTestSuspendFromCode // (Thread*) 1428 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1429END art_quick_implicit_suspend 1430 1431 /* 1432 * Called by managed code that is attempting to call a method on a proxy class. On entry 1433 * x0 holds the proxy method and x1 holds the receiver; The frame size of the invoked proxy 1434 * method agrees with a ref and args callee save frame. 1435 */ 1436 .extern artQuickProxyInvokeHandler 1437ENTRY art_quick_proxy_invoke_handler 1438 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 1439 mov x2, xSELF // pass Thread::Current 1440 mov x3, sp // pass SP 1441 bl artQuickProxyInvokeHandler // (Method* proxy method, receiver, Thread*, SP) 1442 // Use xETR as xSELF might be scratched by native function above. 1443 ldr x2, [xETR, THREAD_EXCEPTION_OFFSET] 1444 cbnz x2, .Lexception_in_proxy // success if no exception is pending 1445 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Restore frame 1446 fmov d0, x0 // Store result in d0 in case it was float or double 1447 ret // return on success 1448.Lexception_in_proxy: 1449 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1450 DELIVER_PENDING_EXCEPTION 1451END art_quick_proxy_invoke_handler 1452 1453 /* 1454 * Called to resolve an imt conflict. xIP1 is a hidden argument that holds the target method's 1455 * dex method index. 1456 */ 1457ENTRY art_quick_imt_conflict_trampoline 1458 ldr w0, [sp, #0] // load caller Method* 1459 ldr w0, [x0, #MIRROR_ART_METHOD_DEX_CACHE_METHODS_OFFSET] // load dex_cache_resolved_methods 1460 add x0, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET // get starting address of data 1461 ldr w0, [x0, xIP1, lsl 2] // load the target method 1462 b art_quick_invoke_interface_trampoline 1463END art_quick_imt_conflict_trampoline 1464 1465ENTRY art_quick_resolution_trampoline 1466 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1467 mov x2, xSELF 1468 mov x3, sp 1469 bl artQuickResolutionTrampoline // (called, receiver, Thread*, SP) 1470 cbz x0, 1f 1471 mov xIP0, x0 // Remember returned code pointer in xIP0. 1472 ldr w0, [sp, #0] // artQuickResolutionTrampoline puts called method in *SP. 1473 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1474 br xIP0 14751: 1476 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1477 DELIVER_PENDING_EXCEPTION 1478END art_quick_resolution_trampoline 1479 1480/* 1481 * Generic JNI frame layout: 1482 * 1483 * #-------------------# 1484 * | | 1485 * | caller method... | 1486 * #-------------------# <--- SP on entry 1487 * | Return X30/LR | 1488 * | X29/FP | callee save 1489 * | X28 | callee save 1490 * | X27 | callee save 1491 * | X26 | callee save 1492 * | X25 | callee save 1493 * | X24 | callee save 1494 * | X23 | callee save 1495 * | X22 | callee save 1496 * | X21 | callee save 1497 * | X20 | callee save 1498 * | X19 | callee save 1499 * | X7 | arg7 1500 * | X6 | arg6 1501 * | X5 | arg5 1502 * | X4 | arg4 1503 * | X3 | arg3 1504 * | X2 | arg2 1505 * | X1 | arg1 1506 * | D7 | float arg 8 1507 * | D6 | float arg 7 1508 * | D5 | float arg 6 1509 * | D4 | float arg 5 1510 * | D3 | float arg 4 1511 * | D2 | float arg 3 1512 * | D1 | float arg 2 1513 * | D0 | float arg 1 1514 * | Method* | <- X0 1515 * #-------------------# 1516 * | local ref cookie | // 4B 1517 * | handle scope size | // 4B 1518 * #-------------------# 1519 * | JNI Call Stack | 1520 * #-------------------# <--- SP on native call 1521 * | | 1522 * | Stack for Regs | The trampoline assembly will pop these values 1523 * | | into registers for native call 1524 * #-------------------# 1525 * | Native code ptr | 1526 * #-------------------# 1527 * | Free scratch | 1528 * #-------------------# 1529 * | Ptr to (1) | <--- SP 1530 * #-------------------# 1531 */ 1532 /* 1533 * Called to do a generic JNI down-call 1534 */ 1535ENTRY art_quick_generic_jni_trampoline 1536 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 1537 1538 // Save SP , so we can have static CFI info. 1539 mov x28, sp 1540 .cfi_def_cfa_register x28 1541 1542 // This looks the same, but is different: this will be updated to point to the bottom 1543 // of the frame when the handle scope is inserted. 1544 mov xFP, sp 1545 1546 mov xIP0, #5120 1547 sub sp, sp, xIP0 1548 1549 // prepare for artQuickGenericJniTrampoline call 1550 // (Thread*, SP) 1551 // x0 x1 <= C calling convention 1552 // xSELF xFP <= where they are 1553 1554 mov x0, xSELF // Thread* 1555 mov x1, xFP 1556 bl artQuickGenericJniTrampoline // (Thread*, sp) 1557 1558 // The C call will have registered the complete save-frame on success. 1559 // The result of the call is: 1560 // x0: pointer to native code, 0 on error. 1561 // x1: pointer to the bottom of the used area of the alloca, can restore stack till there. 1562 1563 // Check for error = 0. 1564 cbz x0, .Lexception_in_native 1565 1566 // Release part of the alloca. 1567 mov sp, x1 1568 1569 // Save the code pointer 1570 mov xIP0, x0 1571 1572 // Load parameters from frame into registers. 1573 // TODO Check with artQuickGenericJniTrampoline. 1574 // Also, check again APPCS64 - the stack arguments are interleaved. 1575 ldp x0, x1, [sp] 1576 ldp x2, x3, [sp, #16] 1577 ldp x4, x5, [sp, #32] 1578 ldp x6, x7, [sp, #48] 1579 1580 ldp d0, d1, [sp, #64] 1581 ldp d2, d3, [sp, #80] 1582 ldp d4, d5, [sp, #96] 1583 ldp d6, d7, [sp, #112] 1584 1585 add sp, sp, #128 1586 1587 blr xIP0 // native call. 1588 1589 // result sign extension is handled in C code 1590 // prepare for artQuickGenericJniEndTrampoline call 1591 // (Thread*, result, result_f) 1592 // x0 x1 x2 <= C calling convention 1593 mov x1, x0 // Result (from saved) 1594 mov x0, xETR // Thread register, original xSELF might be scratched by native code. 1595 fmov x2, d0 // d0 will contain floating point result, but needs to go into x2 1596 1597 bl artQuickGenericJniEndTrampoline 1598 1599 // Pending exceptions possible. 1600 // Use xETR as xSELF might be scratched by native code 1601 ldr x2, [xETR, THREAD_EXCEPTION_OFFSET] 1602 cbnz x2, .Lexception_in_native 1603 1604 // Tear down the alloca. 1605 mov sp, x28 1606 .cfi_def_cfa_register sp 1607 1608 // Tear down the callee-save frame. 1609 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1610 1611 // store into fpr, for when it's a fpr return... 1612 fmov d0, x0 1613 ret 1614 1615.Lexception_in_native: 1616 // Restore xSELF. It might have been scratched by native code. 1617 mov xSELF, xETR 1618 // Move to x1 then sp to please assembler. 1619 ldr x1, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 1620 mov sp, x1 1621 .cfi_def_cfa_register sp 1622 # This will create a new save-all frame, required by the runtime. 1623 DELIVER_PENDING_EXCEPTION 1624END art_quick_generic_jni_trampoline 1625 1626/* 1627 * Called to bridge from the quick to interpreter ABI. On entry the arguments match those 1628 * of a quick call: 1629 * x0 = method being called/to bridge to. 1630 * x1..x7, d0..d7 = arguments to that method. 1631 */ 1632ENTRY art_quick_to_interpreter_bridge 1633 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Set up frame and save arguments. 1634 1635 // x0 will contain mirror::ArtMethod* method. 1636 mov x1, xSELF // How to get Thread::Current() ??? 1637 mov x2, sp 1638 1639 // uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 1640 // mirror::ArtMethod** sp) 1641 bl artQuickToInterpreterBridge 1642 1643 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // TODO: no need to restore arguments in this case. 1644 1645 fmov d0, x0 1646 1647 RETURN_OR_DELIVER_PENDING_EXCEPTION 1648END art_quick_to_interpreter_bridge 1649 1650 1651// 1652// Instrumentation-related stubs 1653// 1654 .extern artInstrumentationMethodEntryFromCode 1655ENTRY art_quick_instrumentation_entry 1656 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1657 1658 mov x20, x0 // Preserve method reference in a callee-save. 1659 1660 mov x2, xSELF 1661 mov x3, xLR 1662 bl artInstrumentationMethodEntryFromCode // (Method*, Object*, Thread*, LR) 1663 1664 mov xIP0, x0 // x0 = result of call. 1665 mov x0, x20 // Reload method reference. 1666 1667 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Note: will restore xSELF 1668 adr xLR, art_quick_instrumentation_exit 1669 br xIP0 // Tail-call method with lr set to art_quick_instrumentation_exit. 1670END art_quick_instrumentation_entry 1671 1672 .extern artInstrumentationMethodExitFromCode 1673ENTRY art_quick_instrumentation_exit 1674 mov xLR, #0 // Clobber LR for later checks. 1675 1676 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME 1677 1678 // We need to save x0 and d0. We could use a callee-save from SETUP_REF_ONLY, but then 1679 // we would need to fully restore it. As there are a lot of callee-save registers, it seems 1680 // easier to have an extra small stack area. 1681 1682 str x0, [sp, #-16]! // Save integer result. 1683 .cfi_adjust_cfa_offset 16 1684 str d0, [sp, #8] // Save floating-point result. 1685 1686 add x1, sp, #16 // Pass SP. 1687 mov x2, x0 // Pass integer result. 1688 fmov x3, d0 // Pass floating-point result. 1689 mov x0, xSELF // Pass Thread. 1690 bl artInstrumentationMethodExitFromCode // (Thread*, SP, gpr_res, fpr_res) 1691 1692 mov xIP0, x0 // Return address from instrumentation call. 1693 mov xLR, x1 // r1 is holding link register if we're to bounce to deoptimize 1694 1695 ldr d0, [sp, #8] // Restore floating-point result. 1696 ldr x0, [sp], 16 // Restore integer result, and drop stack area. 1697 .cfi_adjust_cfa_offset 16 1698 1699 POP_REFS_ONLY_CALLEE_SAVE_FRAME 1700 1701 br xIP0 // Tail-call out. 1702END art_quick_instrumentation_exit 1703 1704 /* 1705 * Instrumentation has requested that we deoptimize into the interpreter. The deoptimization 1706 * will long jump to the upcall with a special exception of -1. 1707 */ 1708 .extern artDeoptimize 1709ENTRY art_quick_deoptimize 1710 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1711 mov x0, xSELF // Pass thread. 1712 bl artDeoptimize // artDeoptimize(Thread*) 1713 brk 0 1714END art_quick_deoptimize 1715 1716 1717 /* 1718 * String's indexOf. 1719 * 1720 * TODO: Not very optimized. 1721 * On entry: 1722 * x0: string object (known non-null) 1723 * w1: char to match (known <= 0xFFFF) 1724 * w2: Starting offset in string data 1725 */ 1726ENTRY art_quick_indexof 1727 ldr w3, [x0, #MIRROR_STRING_COUNT_OFFSET] 1728 ldr w4, [x0, #MIRROR_STRING_OFFSET_OFFSET] 1729 ldr w0, [x0, #MIRROR_STRING_VALUE_OFFSET] // x0 ? 1730 1731 /* Clamp start to [0..count] */ 1732 cmp w2, #0 1733 csel w2, wzr, w2, lt 1734 cmp w2, w3 1735 csel w2, w3, w2, gt 1736 1737 /* Build a pointer to the start of the string data */ 1738 add x0, x0, #MIRROR_CHAR_ARRAY_DATA_OFFSET 1739 add x0, x0, x4, lsl #1 1740 1741 /* Save a copy to compute result */ 1742 mov x5, x0 1743 1744 /* Build pointer to start of data to compare and pre-bias */ 1745 add x0, x0, x2, lsl #1 1746 sub x0, x0, #2 1747 1748 /* Compute iteration count */ 1749 sub w2, w3, w2 1750 1751 /* 1752 * At this point we have: 1753 * x0: start of the data to test 1754 * w1: char to compare 1755 * w2: iteration count 1756 * x5: original start of string data 1757 */ 1758 1759 subs w2, w2, #4 1760 b.lt .Lindexof_remainder 1761 1762.Lindexof_loop4: 1763 ldrh w6, [x0, #2]! 1764 ldrh w7, [x0, #2]! 1765 ldrh wIP0, [x0, #2]! 1766 ldrh wIP1, [x0, #2]! 1767 cmp w6, w1 1768 b.eq .Lmatch_0 1769 cmp w7, w1 1770 b.eq .Lmatch_1 1771 cmp wIP0, w1 1772 b.eq .Lmatch_2 1773 cmp wIP1, w1 1774 b.eq .Lmatch_3 1775 subs w2, w2, #4 1776 b.ge .Lindexof_loop4 1777 1778.Lindexof_remainder: 1779 adds w2, w2, #4 1780 b.eq .Lindexof_nomatch 1781 1782.Lindexof_loop1: 1783 ldrh w6, [x0, #2]! 1784 cmp w6, w1 1785 b.eq .Lmatch_3 1786 subs w2, w2, #1 1787 b.ne .Lindexof_loop1 1788 1789.Lindexof_nomatch: 1790 mov x0, #-1 1791 ret 1792 1793.Lmatch_0: 1794 sub x0, x0, #6 1795 sub x0, x0, x5 1796 asr x0, x0, #1 1797 ret 1798.Lmatch_1: 1799 sub x0, x0, #4 1800 sub x0, x0, x5 1801 asr x0, x0, #1 1802 ret 1803.Lmatch_2: 1804 sub x0, x0, #2 1805 sub x0, x0, x5 1806 asr x0, x0, #1 1807 ret 1808.Lmatch_3: 1809 sub x0, x0, x5 1810 asr x0, x0, #1 1811 ret 1812END art_quick_indexof 1813 1814 /* 1815 * String's compareTo. 1816 * 1817 * TODO: Not very optimized. 1818 * 1819 * On entry: 1820 * x0: this object pointer 1821 * x1: comp object pointer 1822 * 1823 */ 1824 .extern __memcmp16 1825ENTRY art_quick_string_compareto 1826 mov x2, x0 // x0 is return, use x2 for first input. 1827 sub x0, x2, x1 // Same string object? 1828 cbnz x0,1f 1829 ret 18301: // Different string objects. 1831 1832 ldr w6, [x2, #MIRROR_STRING_OFFSET_OFFSET] 1833 ldr w5, [x1, #MIRROR_STRING_OFFSET_OFFSET] 1834 ldr w4, [x2, #MIRROR_STRING_COUNT_OFFSET] 1835 ldr w3, [x1, #MIRROR_STRING_COUNT_OFFSET] 1836 ldr w2, [x2, #MIRROR_STRING_VALUE_OFFSET] 1837 ldr w1, [x1, #MIRROR_STRING_VALUE_OFFSET] 1838 1839 /* 1840 * Now: CharArray* Offset Count 1841 * first arg x2 w6 w4 1842 * second arg x1 w5 w3 1843 */ 1844 1845 // x0 := str1.length(w4) - str2.length(w3). ldr zero-extended w3/w4 into x3/x4. 1846 subs x0, x4, x3 1847 // Min(count1, count2) into w3. 1848 csel x3, x3, x4, ge 1849 1850 // Build pointer into string data. 1851 1852 // Add offset in array (substr etc.) (sign extend and << 1). 1853 add x2, x2, w6, sxtw #1 1854 add x1, x1, w5, sxtw #1 1855 1856 // Add offset in CharArray to array. 1857 add x2, x2, #MIRROR_CHAR_ARRAY_DATA_OFFSET 1858 add x1, x1, #MIRROR_CHAR_ARRAY_DATA_OFFSET 1859 1860 // TODO: Tune this value. 1861 // Check for long string, do memcmp16 for them. 1862 cmp w3, #28 // Constant from arm32. 1863 bgt .Ldo_memcmp16 1864 1865 /* 1866 * Now: 1867 * x2: *first string data 1868 * x1: *second string data 1869 * w3: iteration count 1870 * x0: return value if comparison equal 1871 * x4, x5, x6, x7: free 1872 */ 1873 1874 // Do a simple unrolled loop. 1875.Lloop: 1876 // At least two more elements? 1877 subs w3, w3, #2 1878 b.lt .Lremainder_or_done 1879 1880 ldrh w4, [x2], #2 1881 ldrh w5, [x1], #2 1882 1883 ldrh w6, [x2], #2 1884 ldrh w7, [x1], #2 1885 1886 subs w4, w4, w5 1887 b.ne .Lw4_result 1888 1889 subs w6, w6, w7 1890 b.ne .Lw6_result 1891 1892 b .Lloop 1893 1894.Lremainder_or_done: 1895 adds w3, w3, #1 1896 b.eq .Lremainder 1897 ret 1898 1899.Lremainder: 1900 ldrh w4, [x2], #2 1901 ldrh w5, [x1], #2 1902 subs w4, w4, w5 1903 b.ne .Lw4_result 1904 ret 1905 1906// Result is in w4 1907.Lw4_result: 1908 sxtw x0, w4 1909 ret 1910 1911// Result is in w6 1912.Lw6_result: 1913 sxtw x0, w6 1914 ret 1915 1916.Ldo_memcmp16: 1917 mov x14, x0 // Save x0 and LR. __memcmp16 does not use these temps. 1918 mov x15, xLR // TODO: Codify and check that? 1919 1920 mov x0, x2 1921 uxtw x2, w3 1922 bl __memcmp16 1923 1924 mov xLR, x15 // Restore LR. 1925 1926 cmp x0, #0 // Check the memcmp difference. 1927 csel x0, x0, x14, ne // x0 := x0 != 0 ? x14(prev x0=length diff) : x1. 1928 ret 1929END art_quick_string_compareto 1930 1931// Macro to facilitate adding new entrypoints which call to native function directly. 1932// Currently, xSELF is the only thing we need to take care of between managed code and AAPCS. 1933// But we might introduce more differences. 1934.macro NATIVE_DOWNCALL name, entrypoint 1935 .extern \entrypoint 1936ENTRY \name 1937 stp xSELF, xLR, [sp, #-16]! 1938 bl \entrypoint 1939 ldp xSELF, xLR, [sp], #16 1940 ret 1941END \name 1942.endm 1943 1944NATIVE_DOWNCALL art_quick_fmod fmod 1945NATIVE_DOWNCALL art_quick_fmodf fmodf 1946NATIVE_DOWNCALL art_quick_memcpy memcpy 1947NATIVE_DOWNCALL art_quick_assignable_from_code artIsAssignableFromCode 1948