quick_entrypoints_arm64.S revision 3d21bdf8894e780d349c481e5c9e29fe1556051c
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 // Loads appropriate callee-save-method. 36 ldr xIP0, [xIP0, RUNTIME_SAVE_ALL_CALLEE_SAVE_FRAME_OFFSET ] 37 38 sub sp, sp, #176 39 .cfi_adjust_cfa_offset 176 40 41 // Ugly compile-time check, but we only have the preprocessor. 42#if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVE != 176) 43#error "SAVE_ALL_CALLEE_SAVE_FRAME(ARM64) size not as expected." 44#endif 45 46 // FP callee-saves 47 stp d8, d9, [sp, #8] 48 stp d10, d11, [sp, #24] 49 stp d12, d13, [sp, #40] 50 stp d14, d15, [sp, #56] 51 52 // Thread register and x19 (callee-save) 53 stp xSELF, x19, [sp, #72] 54 .cfi_rel_offset x18, 72 55 .cfi_rel_offset x19, 80 56 57 // callee-saves 58 stp x20, x21, [sp, #88] 59 .cfi_rel_offset x20, 88 60 .cfi_rel_offset x21, 96 61 62 stp x22, x23, [sp, #104] 63 .cfi_rel_offset x22, 104 64 .cfi_rel_offset x23, 112 65 66 stp x24, x25, [sp, #120] 67 .cfi_rel_offset x24, 120 68 .cfi_rel_offset x25, 128 69 70 stp x26, x27, [sp, #136] 71 .cfi_rel_offset x26, 136 72 .cfi_rel_offset x27, 144 73 74 stp x28, x29, [sp, #152] 75 .cfi_rel_offset x28, 152 76 .cfi_rel_offset x29, 160 77 78 str xLR, [sp, #168] 79 .cfi_rel_offset x30, 168 80 81 // Loads appropriate callee-save-method 82 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 83 // Place sp in Thread::Current()->top_quick_frame. 84 mov xIP0, sp 85 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 86.endm 87 88 /* 89 * Macro that sets up the callee save frame to conform with 90 * Runtime::CreateCalleeSaveMethod(kRefsOnly). 91 */ 92.macro SETUP_REFS_ONLY_CALLEE_SAVE_FRAME 93 adrp xIP0, :got:_ZN3art7Runtime9instance_E 94 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 95 96 // Our registers aren't intermixed - just spill in order. 97 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 98 99 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 100 THIS_LOAD_REQUIRES_READ_BARRIER 101 // Loads appropriate callee-save-method. 102 ldr xIP0, [xIP0, RUNTIME_REFS_ONLY_CALLEE_SAVE_FRAME_OFFSET ] 103 104 sub sp, sp, #112 105 .cfi_adjust_cfa_offset 112 106 107 // Ugly compile-time check, but we only have the preprocessor. 108#if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 112) 109#error "REFS_ONLY_CALLEE_SAVE_FRAME(ARM64) size not as expected." 110#endif 111 112 // Callee-saves 113 stp x19, x20, [sp, #16] 114 .cfi_rel_offset x19, 16 115 .cfi_rel_offset x20, 24 116 117 stp x21, x22, [sp, #32] 118 .cfi_rel_offset x21, 32 119 .cfi_rel_offset x22, 40 120 121 stp x23, x24, [sp, #48] 122 .cfi_rel_offset x23, 48 123 .cfi_rel_offset x24, 56 124 125 stp x25, x26, [sp, #64] 126 .cfi_rel_offset x25, 64 127 .cfi_rel_offset x26, 72 128 129 stp x27, x28, [sp, #80] 130 .cfi_rel_offset x27, 80 131 .cfi_rel_offset x28, 88 132 133 // x29(callee-save) and LR 134 stp x29, xLR, [sp, #96] 135 .cfi_rel_offset x29, 96 136 .cfi_rel_offset x30, 104 137 138 // Save xSELF to xETR. 139 mov xETR, xSELF 140 141 // Loads appropriate callee-save-method 142 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsOnly] 143 // Place sp in Thread::Current()->top_quick_frame. 144 mov xIP0, sp 145 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 146.endm 147 148// TODO: Probably no need to restore registers preserved by aapcs64. 149.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 150 // Restore xSELF. 151 mov xSELF, xETR 152 153 // Callee-saves 154 ldp x19, x20, [sp, #16] 155 .cfi_restore x19 156 .cfi_restore x20 157 158 ldp x21, x22, [sp, #32] 159 .cfi_restore x21 160 .cfi_restore x22 161 162 ldp x23, x24, [sp, #48] 163 .cfi_restore x23 164 .cfi_restore x24 165 166 ldp x25, x26, [sp, #64] 167 .cfi_restore x25 168 .cfi_restore x26 169 170 ldp x27, x28, [sp, #80] 171 .cfi_restore x27 172 .cfi_restore x28 173 174 // x29(callee-save) and LR 175 ldp x29, xLR, [sp, #96] 176 .cfi_restore x29 177 .cfi_restore x30 178 179 add sp, sp, #112 180 .cfi_adjust_cfa_offset -112 181.endm 182 183.macro POP_REFS_ONLY_CALLEE_SAVE_FRAME 184 // Restore xSELF as it might be scratched. 185 mov xSELF, xETR 186 // ETR 187 ldr xETR, [sp, #32] 188 .cfi_restore x21 189 190 add sp, sp, #112 191 .cfi_adjust_cfa_offset -112 192.endm 193 194.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 195 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 196 ret 197.endm 198 199 200.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 201 sub sp, sp, #224 202 .cfi_adjust_cfa_offset 224 203 204 // Ugly compile-time check, but we only have the preprocessor. 205#if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 224) 206#error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(ARM64) size not as expected." 207#endif 208 209 // FP args. 210 stp d0, d1, [sp, #8] 211 stp d2, d3, [sp, #24] 212 stp d4, d5, [sp, #40] 213 stp d6, d7, [sp, #56] 214 215 // Core args. 216 str x1, [sp, 72] 217 .cfi_rel_offset x1, 72 218 219 stp x2, x3, [sp, #80] 220 .cfi_rel_offset x2, 80 221 .cfi_rel_offset x3, 88 222 223 stp x4, x5, [sp, #96] 224 .cfi_rel_offset x4, 96 225 .cfi_rel_offset x5, 104 226 227 stp x6, x7, [sp, #112] 228 .cfi_rel_offset x6, 112 229 .cfi_rel_offset x7, 120 230 231 // Callee-saves. 232 stp x19, x20, [sp, #128] 233 .cfi_rel_offset x19, 128 234 .cfi_rel_offset x20, 136 235 236 stp x21, x22, [sp, #144] 237 .cfi_rel_offset x21, 144 238 .cfi_rel_offset x22, 152 239 240 stp x23, x24, [sp, #160] 241 .cfi_rel_offset x23, 160 242 .cfi_rel_offset x24, 168 243 244 stp x25, x26, [sp, #176] 245 .cfi_rel_offset x25, 176 246 .cfi_rel_offset x26, 184 247 248 stp x27, x28, [sp, #192] 249 .cfi_rel_offset x27, 192 250 .cfi_rel_offset x28, 200 251 252 // x29(callee-save) and LR 253 stp x29, xLR, [sp, #208] 254 .cfi_rel_offset x29, 208 255 .cfi_rel_offset x30, 216 256 257 // Save xSELF to xETR. 258 mov xETR, xSELF 259.endm 260 261 /* 262 * Macro that sets up the callee save frame to conform with 263 * Runtime::CreateCalleeSaveMethod(kRefsAndArgs). 264 * 265 * TODO This is probably too conservative - saving FP & LR. 266 */ 267.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 268 adrp xIP0, :got:_ZN3art7Runtime9instance_E 269 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 270 271 // Our registers aren't intermixed - just spill in order. 272 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 273 274 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 275 THIS_LOAD_REQUIRES_READ_BARRIER 276 ldr xIP0, [xIP0, RUNTIME_REFS_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET ] 277 278 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 279 280 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 281 // Place sp in Thread::Current()->top_quick_frame. 282 mov xIP0, sp 283 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 284.endm 285 286.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 287 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 288 str x0, [sp, #0] // Store ArtMethod* to bottom of stack. 289 // Place sp in Thread::Current()->top_quick_frame. 290 mov xIP0, sp 291 str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 292.endm 293 294// TODO: Probably no need to restore registers preserved by aapcs64. 295.macro RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 296 // Restore xSELF. 297 mov xSELF, xETR 298 299 // FP args. 300 ldp d0, d1, [sp, #8] 301 ldp d2, d3, [sp, #24] 302 ldp d4, d5, [sp, #40] 303 ldp d6, d7, [sp, #56] 304 305 // Core args. 306 ldr x1, [sp, 72] 307 .cfi_restore x1 308 309 ldp x2, x3, [sp, #80] 310 .cfi_restore x2 311 .cfi_restore x3 312 313 ldp x4, x5, [sp, #96] 314 .cfi_restore x4 315 .cfi_restore x5 316 317 ldp x6, x7, [sp, #112] 318 .cfi_restore x6 319 .cfi_restore x7 320 321 // Callee-saves. 322 ldp x19, x20, [sp, #128] 323 .cfi_restore x19 324 .cfi_restore x20 325 326 ldp x21, x22, [sp, #144] 327 .cfi_restore x21 328 .cfi_restore x22 329 330 ldp x23, x24, [sp, #160] 331 .cfi_restore x23 332 .cfi_restore x24 333 334 ldp x25, x26, [sp, #176] 335 .cfi_restore x25 336 .cfi_restore x26 337 338 ldp x27, x28, [sp, #192] 339 .cfi_restore x27 340 .cfi_restore x28 341 342 // x29(callee-save) and LR 343 ldp x29, xLR, [sp, #208] 344 .cfi_restore x29 345 .cfi_restore x30 346 347 add sp, sp, #224 348 .cfi_adjust_cfa_offset -224 349.endm 350 351.macro RETURN_IF_RESULT_IS_ZERO 352 cbnz x0, 1f // result non-zero branch over 353 ret // return 3541: 355.endm 356 357.macro RETURN_IF_RESULT_IS_NON_ZERO 358 cbz x0, 1f // result zero branch over 359 ret // return 3601: 361.endm 362 363 /* 364 * Macro that set calls through to artDeliverPendingExceptionFromCode, where the pending 365 * exception is Thread::Current()->exception_ 366 */ 367.macro DELIVER_PENDING_EXCEPTION 368 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 369 mov x0, xSELF 370 371 // Point of no return. 372 b artDeliverPendingExceptionFromCode // artDeliverPendingExceptionFromCode(Thread*) 373 brk 0 // Unreached 374.endm 375 376.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_REG reg 377 ldr \reg, [xSELF, # THREAD_EXCEPTION_OFFSET] // Get exception field. 378 cbnz \reg, 1f 379 ret 3801: 381 DELIVER_PENDING_EXCEPTION 382.endm 383 384.macro RETURN_OR_DELIVER_PENDING_EXCEPTION 385 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG xIP0 386.endm 387 388// Same as above with x1. This is helpful in stubs that want to avoid clobbering another register. 389.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 390 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG x1 391.endm 392 393.macro RETURN_IF_W0_IS_ZERO_OR_DELIVER 394 cbnz w0, 1f // result non-zero branch over 395 ret // return 3961: 397 DELIVER_PENDING_EXCEPTION 398.endm 399 400.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 401 .extern \cxx_name 402ENTRY \c_name 403 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 404 mov x0, xSELF // pass Thread::Current 405 b \cxx_name // \cxx_name(Thread*) 406END \c_name 407.endm 408 409.macro ONE_ARG_RUNTIME_EXCEPTION c_name, cxx_name 410 .extern \cxx_name 411ENTRY \c_name 412 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context. 413 mov x1, xSELF // pass Thread::Current. 414 b \cxx_name // \cxx_name(arg, Thread*). 415 brk 0 416END \c_name 417.endm 418 419.macro TWO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 420 .extern \cxx_name 421ENTRY \c_name 422 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 423 mov x2, xSELF // pass Thread::Current 424 b \cxx_name // \cxx_name(arg1, arg2, Thread*) 425 brk 0 426END \c_name 427.endm 428 429 /* 430 * Called by managed code, saves callee saves and then calls artThrowException 431 * that will place a mock Method* at the bottom of the stack. Arg1 holds the exception. 432 */ 433ONE_ARG_RUNTIME_EXCEPTION art_quick_deliver_exception, artDeliverExceptionFromCode 434 435 /* 436 * Called by managed code to create and deliver a NullPointerException. 437 */ 438NO_ARG_RUNTIME_EXCEPTION art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode 439 440 /* 441 * Called by managed code to create and deliver an ArithmeticException. 442 */ 443NO_ARG_RUNTIME_EXCEPTION art_quick_throw_div_zero, artThrowDivZeroFromCode 444 445 /* 446 * Called by managed code to create and deliver an ArrayIndexOutOfBoundsException. Arg1 holds 447 * index, arg2 holds limit. 448 */ 449TWO_ARG_RUNTIME_EXCEPTION art_quick_throw_array_bounds, artThrowArrayBoundsFromCode 450 451 /* 452 * Called by managed code to create and deliver a StackOverflowError. 453 */ 454NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode 455 456 /* 457 * Called by managed code to create and deliver a NoSuchMethodError. 458 */ 459ONE_ARG_RUNTIME_EXCEPTION art_quick_throw_no_such_method, artThrowNoSuchMethodFromCode 460 461 /* 462 * All generated callsites for interface invokes and invocation slow paths will load arguments 463 * as usual - except instead of loading arg0/x0 with the target Method*, arg0/x0 will contain 464 * the method_idx. This wrapper will save arg1-arg3, load the caller's Method*, align the 465 * stack and call the appropriate C helper. 466 * NOTE: "this" is first visible argument of the target, and so can be found in arg1/x1. 467 * 468 * The helper will attempt to locate the target and return a 128-bit result in x0/x1 consisting 469 * of the target Method* in x0 and method->code_ in x1. 470 * 471 * If unsuccessful, the helper will return null/????. There will be a pending exception in the 472 * thread and we branch to another stub to deliver it. 473 * 474 * On success this wrapper will restore arguments and *jump* to the target, leaving the lr 475 * pointing back to the original caller. 476 * 477 * Adapted from ARM32 code. 478 * 479 * Clobbers xIP0. 480 */ 481.macro INVOKE_TRAMPOLINE c_name, cxx_name 482 .extern \cxx_name 483ENTRY \c_name 484 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME // save callee saves in case allocation triggers GC 485 // Helper signature is always 486 // (method_idx, *this_object, *caller_method, *self, sp) 487 488 ldr x2, [sp, #FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE] // pass caller Method* 489 mov x3, xSELF // pass Thread::Current 490 mov x4, sp 491 bl \cxx_name // (method_idx, this, caller, Thread*, SP) 492 mov xIP0, x1 // save Method*->code_ 493 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 494 cbz x0, 1f // did we find the target? if not go to exception delivery 495 br xIP0 // tail call to target 4961: 497 DELIVER_PENDING_EXCEPTION 498END \c_name 499.endm 500 501INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline, artInvokeInterfaceTrampoline 502INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline_with_access_check, artInvokeInterfaceTrampolineWithAccessCheck 503 504INVOKE_TRAMPOLINE art_quick_invoke_static_trampoline_with_access_check, artInvokeStaticTrampolineWithAccessCheck 505INVOKE_TRAMPOLINE art_quick_invoke_direct_trampoline_with_access_check, artInvokeDirectTrampolineWithAccessCheck 506INVOKE_TRAMPOLINE art_quick_invoke_super_trampoline_with_access_check, artInvokeSuperTrampolineWithAccessCheck 507INVOKE_TRAMPOLINE art_quick_invoke_virtual_trampoline_with_access_check, artInvokeVirtualTrampolineWithAccessCheck 508 509 510.macro INVOKE_STUB_CREATE_FRAME 511 512SAVE_SIZE=15*8 // x4, x5, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, SP, LR, FP saved. 513SAVE_SIZE_AND_METHOD=SAVE_SIZE+8 514 515 516 mov x9, sp // Save stack pointer. 517 .cfi_register sp,x9 518 519 add x10, x2, # SAVE_SIZE_AND_METHOD // calculate size of frame. 520 sub x10, sp, x10 // Calculate SP position - saves + ArtMethod* + args 521 and x10, x10, # ~0xf // Enforce 16 byte stack alignment. 522 mov sp, x10 // Set new SP. 523 524 sub x10, x9, #SAVE_SIZE // Calculate new FP (later). Done here as we must move SP 525 .cfi_def_cfa_register x10 // before this. 526 .cfi_adjust_cfa_offset SAVE_SIZE 527 528 str x28, [x10, #112] 529 .cfi_rel_offset x28, 112 530 531 stp x26, x27, [x10, #96] 532 .cfi_rel_offset x26, 96 533 .cfi_rel_offset x27, 104 534 535 stp x24, x25, [x10, #80] 536 .cfi_rel_offset x24, 80 537 .cfi_rel_offset x25, 88 538 539 stp x22, x23, [x10, #64] 540 .cfi_rel_offset x22, 64 541 .cfi_rel_offset x23, 72 542 543 stp x20, x21, [x10, #48] 544 .cfi_rel_offset x20, 48 545 .cfi_rel_offset x21, 56 546 547 stp x9, x19, [x10, #32] // Save old stack pointer and x19. 548 .cfi_rel_offset sp, 32 549 .cfi_rel_offset x19, 40 550 551 stp x4, x5, [x10, #16] // Save result and shorty addresses. 552 .cfi_rel_offset x4, 16 553 .cfi_rel_offset x5, 24 554 555 stp xFP, xLR, [x10] // Store LR & FP. 556 .cfi_rel_offset x29, 0 557 .cfi_rel_offset x30, 8 558 559 mov xFP, x10 // Use xFP now, as it's callee-saved. 560 .cfi_def_cfa_register x29 561 mov xSELF, x3 // Move thread pointer into SELF register. 562 563 // Copy arguments into stack frame. 564 // Use simple copy routine for now. 565 // 4 bytes per slot. 566 // X1 - source address 567 // W2 - args length 568 // X9 - destination address. 569 // W10 - temporary 570 add x9, sp, #8 // Destination address is bottom of stack + null. 571 572 // Use \@ to differentiate between macro invocations. 573.LcopyParams\@: 574 cmp w2, #0 575 beq .LendCopyParams\@ 576 sub w2, w2, #4 // Need 65536 bytes of range. 577 ldr w10, [x1, x2] 578 str w10, [x9, x2] 579 580 b .LcopyParams\@ 581 582.LendCopyParams\@: 583 584 // Store null into ArtMethod* at bottom of frame. 585 str xzr, [sp] 586.endm 587 588.macro INVOKE_STUB_CALL_AND_RETURN 589 590 // load method-> METHOD_QUICK_CODE_OFFSET 591 ldr x9, [x0, #ART_METHOD_QUICK_CODE_OFFSET_64] 592 // Branch to method. 593 blr x9 594 595 // Restore return value address and shorty address. 596 ldp x4,x5, [xFP, #16] 597 .cfi_restore x4 598 .cfi_restore x5 599 600 ldr x28, [xFP, #112] 601 .cfi_restore x28 602 603 ldp x26, x27, [xFP, #96] 604 .cfi_restore x26 605 .cfi_restore x27 606 607 ldp x24, x25, [xFP, #80] 608 .cfi_restore x24 609 .cfi_restore x25 610 611 ldp x22, x23, [xFP, #64] 612 .cfi_restore x22 613 .cfi_restore x23 614 615 ldp x20, x21, [xFP, #48] 616 .cfi_restore x20 617 .cfi_restore x21 618 619 // Store result (w0/x0/s0/d0) appropriately, depending on resultType. 620 ldrb w10, [x5] 621 622 // Don't set anything for a void type. 623 cmp w10, #'V' 624 beq .Lexit_art_quick_invoke_stub\@ 625 626 cmp w10, #'D' 627 bne .Lreturn_is_float\@ 628 str d0, [x4] 629 b .Lexit_art_quick_invoke_stub\@ 630 631.Lreturn_is_float\@: 632 cmp w10, #'F' 633 bne .Lreturn_is_int\@ 634 str s0, [x4] 635 b .Lexit_art_quick_invoke_stub\@ 636 637 // Just store x0. Doesn't matter if it is 64 or 32 bits. 638.Lreturn_is_int\@: 639 str x0, [x4] 640 641.Lexit_art_quick_invoke_stub\@: 642 ldp x2, x19, [xFP, #32] // Restore stack pointer and x19. 643 .cfi_restore x19 644 mov sp, x2 645 .cfi_restore sp 646 647 ldp xFP, xLR, [xFP] // Restore old frame pointer and link register. 648 .cfi_restore x29 649 .cfi_restore x30 650 651 ret 652 653.endm 654 655 656/* 657 * extern"C" void art_quick_invoke_stub(ArtMethod *method, x0 658 * uint32_t *args, x1 659 * uint32_t argsize, w2 660 * Thread *self, x3 661 * JValue *result, x4 662 * char *shorty); x5 663 * +----------------------+ 664 * | | 665 * | C/C++ frame | 666 * | LR'' | 667 * | FP'' | <- SP' 668 * +----------------------+ 669 * +----------------------+ 670 * | x28 | <- TODO: Remove callee-saves. 671 * | : | 672 * | x19 | 673 * | SP' | 674 * | X5 | 675 * | X4 | Saved registers 676 * | LR' | 677 * | FP' | <- FP 678 * +----------------------+ 679 * | uint32_t out[n-1] | 680 * | : : | Outs 681 * | uint32_t out[0] | 682 * | ArtMethod* | <- SP value=null 683 * +----------------------+ 684 * 685 * Outgoing registers: 686 * x0 - Method* 687 * x1-x7 - integer parameters. 688 * d0-d7 - Floating point parameters. 689 * xSELF = self 690 * SP = & of ArtMethod* 691 * x1 = "this" pointer. 692 * 693 */ 694ENTRY art_quick_invoke_stub 695 // Spill registers as per AACPS64 calling convention. 696 INVOKE_STUB_CREATE_FRAME 697 698 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 699 // Parse the passed shorty to determine which register to load. 700 // Load addresses for routines that load WXSD registers. 701 adr x11, .LstoreW2 702 adr x12, .LstoreX2 703 adr x13, .LstoreS0 704 adr x14, .LstoreD0 705 706 // Initialize routine offsets to 0 for integers and floats. 707 // x8 for integers, x15 for floating point. 708 mov x8, #0 709 mov x15, #0 710 711 add x10, x5, #1 // Load shorty address, plus one to skip return value. 712 ldr w1, [x9],#4 // Load "this" parameter, and increment arg pointer. 713 714 // Loop to fill registers. 715.LfillRegisters: 716 ldrb w17, [x10], #1 // Load next character in signature, and increment. 717 cbz w17, .LcallFunction // Exit at end of signature. Shorty 0 terminated. 718 719 cmp w17, #'F' // is this a float? 720 bne .LisDouble 721 722 cmp x15, # 8*12 // Skip this load if all registers full. 723 beq .Ladvance4 724 725 add x17, x13, x15 // Calculate subroutine to jump to. 726 br x17 727 728.LisDouble: 729 cmp w17, #'D' // is this a double? 730 bne .LisLong 731 732 cmp x15, # 8*12 // Skip this load if all registers full. 733 beq .Ladvance8 734 735 add x17, x14, x15 // Calculate subroutine to jump to. 736 br x17 737 738.LisLong: 739 cmp w17, #'J' // is this a long? 740 bne .LisOther 741 742 cmp x8, # 6*12 // Skip this load if all registers full. 743 beq .Ladvance8 744 745 add x17, x12, x8 // Calculate subroutine to jump to. 746 br x17 747 748.LisOther: // Everything else takes one vReg. 749 cmp x8, # 6*12 // Skip this load if all registers full. 750 beq .Ladvance4 751 752 add x17, x11, x8 // Calculate subroutine to jump to. 753 br x17 754 755.Ladvance4: 756 add x9, x9, #4 757 b .LfillRegisters 758 759.Ladvance8: 760 add x9, x9, #8 761 b .LfillRegisters 762 763// Macro for loading a parameter into a register. 764// counter - the register with offset into these tables 765// size - the size of the register - 4 or 8 bytes. 766// register - the name of the register to be loaded. 767.macro LOADREG counter size register return 768 ldr \register , [x9], #\size 769 add \counter, \counter, 12 770 b \return 771.endm 772 773// Store ints. 774.LstoreW2: 775 LOADREG x8 4 w2 .LfillRegisters 776 LOADREG x8 4 w3 .LfillRegisters 777 LOADREG x8 4 w4 .LfillRegisters 778 LOADREG x8 4 w5 .LfillRegisters 779 LOADREG x8 4 w6 .LfillRegisters 780 LOADREG x8 4 w7 .LfillRegisters 781 782// Store longs. 783.LstoreX2: 784 LOADREG x8 8 x2 .LfillRegisters 785 LOADREG x8 8 x3 .LfillRegisters 786 LOADREG x8 8 x4 .LfillRegisters 787 LOADREG x8 8 x5 .LfillRegisters 788 LOADREG x8 8 x6 .LfillRegisters 789 LOADREG x8 8 x7 .LfillRegisters 790 791// Store singles. 792.LstoreS0: 793 LOADREG x15 4 s0 .LfillRegisters 794 LOADREG x15 4 s1 .LfillRegisters 795 LOADREG x15 4 s2 .LfillRegisters 796 LOADREG x15 4 s3 .LfillRegisters 797 LOADREG x15 4 s4 .LfillRegisters 798 LOADREG x15 4 s5 .LfillRegisters 799 LOADREG x15 4 s6 .LfillRegisters 800 LOADREG x15 4 s7 .LfillRegisters 801 802// Store doubles. 803.LstoreD0: 804 LOADREG x15 8 d0 .LfillRegisters 805 LOADREG x15 8 d1 .LfillRegisters 806 LOADREG x15 8 d2 .LfillRegisters 807 LOADREG x15 8 d3 .LfillRegisters 808 LOADREG x15 8 d4 .LfillRegisters 809 LOADREG x15 8 d5 .LfillRegisters 810 LOADREG x15 8 d6 .LfillRegisters 811 LOADREG x15 8 d7 .LfillRegisters 812 813 814.LcallFunction: 815 816 INVOKE_STUB_CALL_AND_RETURN 817 818END art_quick_invoke_stub 819 820/* extern"C" 821 * void art_quick_invoke_static_stub(ArtMethod *method, x0 822 * uint32_t *args, x1 823 * uint32_t argsize, w2 824 * Thread *self, x3 825 * JValue *result, x4 826 * char *shorty); x5 827 */ 828ENTRY art_quick_invoke_static_stub 829 // Spill registers as per AACPS64 calling convention. 830 INVOKE_STUB_CREATE_FRAME 831 832 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 833 // Parse the passed shorty to determine which register to load. 834 // Load addresses for routines that load WXSD registers. 835 adr x11, .LstoreW1_2 836 adr x12, .LstoreX1_2 837 adr x13, .LstoreS0_2 838 adr x14, .LstoreD0_2 839 840 // Initialize routine offsets to 0 for integers and floats. 841 // x8 for integers, x15 for floating point. 842 mov x8, #0 843 mov x15, #0 844 845 add x10, x5, #1 // Load shorty address, plus one to skip return value. 846 847 // Loop to fill registers. 848.LfillRegisters2: 849 ldrb w17, [x10], #1 // Load next character in signature, and increment. 850 cbz w17, .LcallFunction2 // Exit at end of signature. Shorty 0 terminated. 851 852 cmp w17, #'F' // is this a float? 853 bne .LisDouble2 854 855 cmp x15, # 8*12 // Skip this load if all registers full. 856 beq .Ladvance4_2 857 858 add x17, x13, x15 // Calculate subroutine to jump to. 859 br x17 860 861.LisDouble2: 862 cmp w17, #'D' // is this a double? 863 bne .LisLong2 864 865 cmp x15, # 8*12 // Skip this load if all registers full. 866 beq .Ladvance8_2 867 868 add x17, x14, x15 // Calculate subroutine to jump to. 869 br x17 870 871.LisLong2: 872 cmp w17, #'J' // is this a long? 873 bne .LisOther2 874 875 cmp x8, # 7*12 // Skip this load if all registers full. 876 beq .Ladvance8_2 877 878 add x17, x12, x8 // Calculate subroutine to jump to. 879 br x17 880 881.LisOther2: // Everything else takes one vReg. 882 cmp x8, # 7*12 // Skip this load if all registers full. 883 beq .Ladvance4_2 884 885 add x17, x11, x8 // Calculate subroutine to jump to. 886 br x17 887 888.Ladvance4_2: 889 add x9, x9, #4 890 b .LfillRegisters2 891 892.Ladvance8_2: 893 add x9, x9, #8 894 b .LfillRegisters2 895 896// Store ints. 897.LstoreW1_2: 898 LOADREG x8 4 w1 .LfillRegisters2 899 LOADREG x8 4 w2 .LfillRegisters2 900 LOADREG x8 4 w3 .LfillRegisters2 901 LOADREG x8 4 w4 .LfillRegisters2 902 LOADREG x8 4 w5 .LfillRegisters2 903 LOADREG x8 4 w6 .LfillRegisters2 904 LOADREG x8 4 w7 .LfillRegisters2 905 906// Store longs. 907.LstoreX1_2: 908 LOADREG x8 8 x1 .LfillRegisters2 909 LOADREG x8 8 x2 .LfillRegisters2 910 LOADREG x8 8 x3 .LfillRegisters2 911 LOADREG x8 8 x4 .LfillRegisters2 912 LOADREG x8 8 x5 .LfillRegisters2 913 LOADREG x8 8 x6 .LfillRegisters2 914 LOADREG x8 8 x7 .LfillRegisters2 915 916// Store singles. 917.LstoreS0_2: 918 LOADREG x15 4 s0 .LfillRegisters2 919 LOADREG x15 4 s1 .LfillRegisters2 920 LOADREG x15 4 s2 .LfillRegisters2 921 LOADREG x15 4 s3 .LfillRegisters2 922 LOADREG x15 4 s4 .LfillRegisters2 923 LOADREG x15 4 s5 .LfillRegisters2 924 LOADREG x15 4 s6 .LfillRegisters2 925 LOADREG x15 4 s7 .LfillRegisters2 926 927// Store doubles. 928.LstoreD0_2: 929 LOADREG x15 8 d0 .LfillRegisters2 930 LOADREG x15 8 d1 .LfillRegisters2 931 LOADREG x15 8 d2 .LfillRegisters2 932 LOADREG x15 8 d3 .LfillRegisters2 933 LOADREG x15 8 d4 .LfillRegisters2 934 LOADREG x15 8 d5 .LfillRegisters2 935 LOADREG x15 8 d6 .LfillRegisters2 936 LOADREG x15 8 d7 .LfillRegisters2 937 938 939.LcallFunction2: 940 941 INVOKE_STUB_CALL_AND_RETURN 942 943END art_quick_invoke_static_stub 944 945 946 947 /* 948 * On entry x0 is uintptr_t* gprs_ and x1 is uint64_t* fprs_ 949 */ 950 951ENTRY art_quick_do_long_jump 952 // Load FPRs 953 ldp d0, d1, [x1], #16 954 ldp d2, d3, [x1], #16 955 ldp d4, d5, [x1], #16 956 ldp d6, d7, [x1], #16 957 ldp d8, d9, [x1], #16 958 ldp d10, d11, [x1], #16 959 ldp d12, d13, [x1], #16 960 ldp d14, d15, [x1], #16 961 ldp d16, d17, [x1], #16 962 ldp d18, d19, [x1], #16 963 ldp d20, d21, [x1], #16 964 ldp d22, d23, [x1], #16 965 ldp d24, d25, [x1], #16 966 ldp d26, d27, [x1], #16 967 ldp d28, d29, [x1], #16 968 ldp d30, d31, [x1] 969 970 // Load GPRs 971 // TODO: lots of those are smashed, could optimize. 972 add x0, x0, #30*8 973 ldp x30, x1, [x0], #-16 974 ldp x28, x29, [x0], #-16 975 ldp x26, x27, [x0], #-16 976 ldp x24, x25, [x0], #-16 977 ldp x22, x23, [x0], #-16 978 ldp x20, x21, [x0], #-16 979 ldp x18, x19, [x0], #-16 980 ldp x16, x17, [x0], #-16 981 ldp x14, x15, [x0], #-16 982 ldp x12, x13, [x0], #-16 983 ldp x10, x11, [x0], #-16 984 ldp x8, x9, [x0], #-16 985 ldp x6, x7, [x0], #-16 986 ldp x4, x5, [x0], #-16 987 ldp x2, x3, [x0], #-16 988 mov sp, x1 989 990 // TODO: Is it really OK to use LR for the target PC? 991 mov x0, #0 992 mov x1, #0 993 br xLR 994END art_quick_do_long_jump 995 996 /* 997 * Entry from managed code that calls artLockObjectFromCode, may block for GC. x0 holds the 998 * possibly null object to lock. 999 * 1000 * Derived from arm32 code. 1001 */ 1002 .extern artLockObjectFromCode 1003ENTRY art_quick_lock_object 1004 cbz w0, .Lslow_lock 1005 add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore 1006.Lretry_lock: 1007 ldr w2, [xSELF, #THREAD_ID_OFFSET] // TODO: Can the thread ID really change during the loop? 1008 ldxr w1, [x4] 1009 mov x3, x1 1010 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1011 cbnz w3, .Lnot_unlocked // already thin locked 1012 // unlocked case - x1: original lock word that's zero except for the read barrier bits. 1013 orr x2, x1, x2 // x2 holds thread id with count of 0 with preserved read barrier bits 1014 stxr w3, w2, [x4] 1015 cbnz w3, .Llock_stxr_fail // store failed, retry 1016 dmb ishld // full (LoadLoad|LoadStore) memory barrier 1017 ret 1018.Lnot_unlocked: // x1: original lock word 1019 lsr w3, w1, LOCK_WORD_STATE_SHIFT 1020 cbnz w3, .Lslow_lock // if either of the top two bits are set, go slow path 1021 eor w2, w1, w2 // lock_word.ThreadId() ^ self->ThreadId() 1022 uxth w2, w2 // zero top 16 bits 1023 cbnz w2, .Lslow_lock // lock word and self thread id's match -> recursive lock 1024 // else contention, go to slow path 1025 mov x3, x1 // copy the lock word to check count overflow. 1026 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits. 1027 add w2, w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count in lock word placing in w2 to check overflow 1028 lsr w3, w2, LOCK_WORD_READ_BARRIER_STATE_SHIFT // if either of the upper two bits (28-29) are set, we overflowed. 1029 cbnz w3, .Lslow_lock // if we overflow the count go slow path 1030 add w2, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count for real 1031 stxr w3, w2, [x4] 1032 cbnz w3, .Llock_stxr_fail // store failed, retry 1033 ret 1034.Llock_stxr_fail: 1035 b .Lretry_lock // retry 1036.Lslow_lock: 1037 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case we block 1038 mov x1, xSELF // pass Thread::Current 1039 bl artLockObjectFromCode // (Object* obj, Thread*) 1040 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1041 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1042END art_quick_lock_object 1043 1044 /* 1045 * Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure. 1046 * x0 holds the possibly null object to lock. 1047 * 1048 * Derived from arm32 code. 1049 */ 1050 .extern artUnlockObjectFromCode 1051ENTRY art_quick_unlock_object 1052 cbz x0, .Lslow_unlock 1053 add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore 1054.Lretry_unlock: 1055#ifndef USE_READ_BARRIER 1056 ldr w1, [x4] 1057#else 1058 ldxr w1, [x4] // Need to use atomic instructions for read barrier 1059#endif 1060 lsr w2, w1, LOCK_WORD_STATE_SHIFT 1061 cbnz w2, .Lslow_unlock // if either of the top two bits are set, go slow path 1062 ldr w2, [xSELF, #THREAD_ID_OFFSET] 1063 mov x3, x1 // copy lock word to check thread id equality 1064 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1065 eor w3, w3, w2 // lock_word.ThreadId() ^ self->ThreadId() 1066 uxth w3, w3 // zero top 16 bits 1067 cbnz w3, .Lslow_unlock // do lock word and self thread id's match? 1068 mov x3, x1 // copy lock word to detect transition to unlocked 1069 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits 1070 cmp w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE 1071 bpl .Lrecursive_thin_unlock 1072 // transition to unlocked 1073 mov x3, x1 1074 and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK // w3: zero except for the preserved read barrier bits 1075 dmb ish // full (LoadStore|StoreStore) memory barrier 1076#ifndef USE_READ_BARRIER 1077 str w3, [x4] 1078#else 1079 stxr w2, w3, [x4] // Need to use atomic instructions for read barrier 1080 cbnz w2, .Lunlock_stxr_fail // store failed, retry 1081#endif 1082 ret 1083.Lrecursive_thin_unlock: // w1: original lock word 1084 sub w1, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // decrement count 1085#ifndef USE_READ_BARRIER 1086 str w1, [x4] 1087#else 1088 stxr w2, w1, [x4] // Need to use atomic instructions for read barrier 1089 cbnz w2, .Lunlock_stxr_fail // store failed, retry 1090#endif 1091 ret 1092.Lunlock_stxr_fail: 1093 b .Lretry_unlock // retry 1094.Lslow_unlock: 1095 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case exception allocation triggers GC 1096 mov x1, xSELF // pass Thread::Current 1097 bl artUnlockObjectFromCode // (Object* obj, Thread*) 1098 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1099 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1100END art_quick_unlock_object 1101 1102 /* 1103 * Entry from managed code that calls artIsAssignableFromCode and on failure calls 1104 * artThrowClassCastException. 1105 */ 1106 .extern artThrowClassCastException 1107ENTRY art_quick_check_cast 1108 // Store arguments and link register 1109 sub sp, sp, #32 // Stack needs to be 16b aligned on calls 1110 .cfi_adjust_cfa_offset 32 1111 stp x0, x1, [sp] 1112 .cfi_rel_offset x0, 0 1113 .cfi_rel_offset x1, 8 1114 stp xSELF, xLR, [sp, #16] 1115 .cfi_rel_offset x18, 16 1116 .cfi_rel_offset x30, 24 1117 1118 // Call runtime code 1119 bl artIsAssignableFromCode 1120 1121 // Check for exception 1122 cbz x0, .Lthrow_class_cast_exception 1123 1124 // Restore and return 1125 ldp x0, x1, [sp] 1126 .cfi_restore x0 1127 .cfi_restore x1 1128 ldp xSELF, xLR, [sp, #16] 1129 .cfi_restore x18 1130 .cfi_restore x30 1131 add sp, sp, #32 1132 .cfi_adjust_cfa_offset -32 1133 ret 1134 1135.Lthrow_class_cast_exception: 1136 // Restore 1137 ldp x0, x1, [sp] 1138 .cfi_restore x0 1139 .cfi_restore x1 1140 ldp xSELF, xLR, [sp, #16] 1141 .cfi_restore x18 1142 .cfi_restore x30 1143 add sp, sp, #32 1144 .cfi_adjust_cfa_offset -32 1145 1146 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 1147 mov x2, xSELF // pass Thread::Current 1148 b artThrowClassCastException // (Class*, Class*, Thread*) 1149 brk 0 // We should not return here... 1150END art_quick_check_cast 1151 1152 /* 1153 * Entry from managed code for array put operations of objects where the value being stored 1154 * needs to be checked for compatibility. 1155 * x0 = array, x1 = index, x2 = value 1156 * 1157 * Currently all values should fit into w0/w1/w2, and w1 always will as indices are 32b. We 1158 * assume, though, that the upper 32b are zeroed out. At least for x1/w1 we can do better by 1159 * using index-zero-extension in load/stores. 1160 * 1161 * Temporaries: x3, x4 1162 * TODO: x4 OK? ip seems wrong here. 1163 */ 1164ENTRY art_quick_aput_obj_with_null_and_bound_check 1165 tst x0, x0 1166 bne art_quick_aput_obj_with_bound_check 1167 b art_quick_throw_null_pointer_exception 1168END art_quick_aput_obj_with_null_and_bound_check 1169 1170ENTRY art_quick_aput_obj_with_bound_check 1171 ldr w3, [x0, #MIRROR_ARRAY_LENGTH_OFFSET] 1172 cmp w3, w1 1173 bhi art_quick_aput_obj 1174 mov x0, x1 1175 mov x1, x3 1176 b art_quick_throw_array_bounds 1177END art_quick_aput_obj_with_bound_check 1178 1179ENTRY art_quick_aput_obj 1180 cbz x2, .Ldo_aput_null 1181 ldr w3, [x0, #MIRROR_OBJECT_CLASS_OFFSET] // Heap reference = 32b 1182 // This also zero-extends to x3 1183 ldr w4, [x2, #MIRROR_OBJECT_CLASS_OFFSET] // Heap reference = 32b 1184 // This also zero-extends to x4 1185 ldr w3, [x3, #MIRROR_CLASS_COMPONENT_TYPE_OFFSET] // Heap reference = 32b 1186 // This also zero-extends to x3 1187 cmp w3, w4 // value's type == array's component type - trivial assignability 1188 bne .Lcheck_assignability 1189.Ldo_aput: 1190 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1191 // "Compress" = do nothing 1192 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1193 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1194 lsr x0, x0, #7 1195 strb w3, [x3, x0] 1196 ret 1197.Ldo_aput_null: 1198 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1199 // "Compress" = do nothing 1200 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1201 ret 1202.Lcheck_assignability: 1203 // Store arguments and link register 1204 sub sp, sp, #48 // Stack needs to be 16b aligned on calls 1205 .cfi_adjust_cfa_offset 48 1206 stp x0, x1, [sp] 1207 .cfi_rel_offset x0, 0 1208 .cfi_rel_offset x1, 8 1209 stp x2, xSELF, [sp, #16] 1210 .cfi_rel_offset x2, 16 1211 .cfi_rel_offset x18, 24 1212 str xLR, [sp, #32] 1213 .cfi_rel_offset x30, 32 1214 1215 // Call runtime code 1216 mov x0, x3 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1217 mov x1, x4 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1218 bl artIsAssignableFromCode 1219 1220 // Check for exception 1221 cbz x0, .Lthrow_array_store_exception 1222 1223 // Restore 1224 ldp x0, x1, [sp] 1225 .cfi_restore x0 1226 .cfi_restore x1 1227 ldp x2, xSELF, [sp, #16] 1228 .cfi_restore x2 1229 .cfi_restore x18 1230 ldr xLR, [sp, #32] 1231 .cfi_restore x30 1232 add sp, sp, #48 1233 .cfi_adjust_cfa_offset -48 1234 1235 add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET 1236 // "Compress" = do nothing 1237 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1238 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1239 lsr x0, x0, #7 1240 strb w3, [x3, x0] 1241 ret 1242.Lthrow_array_store_exception: 1243 ldp x0, x1, [sp] 1244 .cfi_restore x0 1245 .cfi_restore x1 1246 ldp x2, xSELF, [sp, #16] 1247 .cfi_restore x2 1248 .cfi_restore x18 1249 ldr xLR, [sp, #32] 1250 .cfi_restore x30 1251 add sp, sp, #48 1252 .cfi_adjust_cfa_offset -48 1253 1254 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1255 mov x1, x2 // Pass value. 1256 mov x2, xSELF // Pass Thread::Current. 1257 b artThrowArrayStoreException // (Object*, Object*, Thread*). 1258 brk 0 // Unreached. 1259END art_quick_aput_obj 1260 1261// Macro to facilitate adding new allocation entrypoints. 1262.macro ONE_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 x1, xSELF // pass Thread::Current 1267 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*) 1268 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1269 \return 1270END \name 1271.endm 1272 1273// Macro to facilitate adding new allocation entrypoints. 1274.macro TWO_ARG_DOWNCALL name, entrypoint, return 1275 .extern \entrypoint 1276ENTRY \name 1277 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1278 mov x2, xSELF // pass Thread::Current 1279 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*) 1280 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1281 \return 1282END \name 1283.endm 1284 1285// Macro to facilitate adding new allocation entrypoints. 1286.macro THREE_ARG_DOWNCALL name, entrypoint, return 1287 .extern \entrypoint 1288ENTRY \name 1289 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1290 mov x3, xSELF // pass Thread::Current 1291 bl \entrypoint 1292 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1293 \return 1294END \name 1295.endm 1296 1297// Macro to facilitate adding new allocation entrypoints. 1298.macro FOUR_ARG_DOWNCALL name, entrypoint, return 1299 .extern \entrypoint 1300ENTRY \name 1301 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1302 mov x4, xSELF // pass Thread::Current 1303 bl \entrypoint // 1304 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1305 \return 1306 DELIVER_PENDING_EXCEPTION 1307END \name 1308.endm 1309 1310// Macros taking opportunity of code similarities for downcalls with referrer. 1311.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return 1312 .extern \entrypoint 1313ENTRY \name 1314 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1315 ldr x1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1316 mov x2, xSELF // pass Thread::Current 1317 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP) 1318 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1319 \return 1320END \name 1321.endm 1322 1323.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return 1324 .extern \entrypoint 1325ENTRY \name 1326 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1327 ldr x2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1328 mov x3, xSELF // pass Thread::Current 1329 bl \entrypoint 1330 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1331 \return 1332END \name 1333.endm 1334 1335.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return 1336 .extern \entrypoint 1337ENTRY \name 1338 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1339 ldr x3, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1340 mov x4, xSELF // pass Thread::Current 1341 bl \entrypoint 1342 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1343 \return 1344END \name 1345.endm 1346 1347.macro RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1348 cbz w0, 1f // result zero branch over 1349 ret // return 13501: 1351 DELIVER_PENDING_EXCEPTION 1352.endm 1353 1354 /* 1355 * Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on 1356 * failure. 1357 */ 1358TWO_ARG_REF_DOWNCALL art_quick_handle_fill_data, artHandleFillArrayDataFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1359 1360 /* 1361 * Entry from managed code when uninitialized static storage, this stub will run the class 1362 * initializer and deliver the exception on error. On success the static storage base is 1363 * returned. 1364 */ 1365ONE_ARG_DOWNCALL art_quick_initialize_static_storage, artInitializeStaticStorageFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1366 1367ONE_ARG_DOWNCALL art_quick_initialize_type, artInitializeTypeFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1368ONE_ARG_DOWNCALL art_quick_initialize_type_and_verify_access, artInitializeTypeAndVerifyAccessFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1369 1370ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1371ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1372ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1373ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1374ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1375ONE_ARG_REF_DOWNCALL art_quick_get64_static, artGet64StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1376ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1377 1378TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1379TWO_ARG_REF_DOWNCALL art_quick_get_byte_instance, artGetByteInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1380TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1381TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1382TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1383TWO_ARG_REF_DOWNCALL art_quick_get64_instance, artGet64InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1384TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1385 1386TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1387TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1388TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1389TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1390 1391THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1392THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1393THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1394THREE_ARG_REF_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1395THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1396 1397// This is separated out as the argument order is different. 1398 .extern artSet64StaticFromCode 1399ENTRY art_quick_set64_static 1400 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1401 mov x3, x1 // Store value 1402 ldr x1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1403 mov x2, x3 // Put value param 1404 mov x3, xSELF // pass Thread::Current 1405 bl artSet64StaticFromCode 1406 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME 1407 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1408END art_quick_set64_static 1409 1410 /* 1411 * Entry from managed code to resolve a string, this stub will allocate a String and deliver an 1412 * exception on error. On success the String is returned. w0 holds the string index. The fast 1413 * path check for hit in strings cache has already been performed. 1414 */ 1415ONE_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER 1416 1417// Generate the allocation entrypoints for each allocator. 1418GENERATE_ALL_ALLOC_ENTRYPOINTS 1419 1420 /* 1421 * Called by managed code when the thread has been asked to suspend. 1422 */ 1423 .extern artTestSuspendFromCode 1424ENTRY art_quick_test_suspend 1425 ldrh w0, [xSELF, #THREAD_FLAGS_OFFSET] // get xSELF->state_and_flags.as_struct.flags 1426 cbnz w0, .Lneed_suspend // check flags == 0 1427 ret // return if flags == 0 1428.Lneed_suspend: 1429 mov x0, xSELF 1430 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1431 bl artTestSuspendFromCode // (Thread*) 1432 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1433END art_quick_test_suspend 1434 1435ENTRY art_quick_implicit_suspend 1436 mov x0, xSELF 1437 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1438 bl artTestSuspendFromCode // (Thread*) 1439 RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1440END art_quick_implicit_suspend 1441 1442 /* 1443 * Called by managed code that is attempting to call a method on a proxy class. On entry 1444 * x0 holds the proxy method and x1 holds the receiver; The frame size of the invoked proxy 1445 * method agrees with a ref and args callee save frame. 1446 */ 1447 .extern artQuickProxyInvokeHandler 1448ENTRY art_quick_proxy_invoke_handler 1449 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 1450 mov x2, xSELF // pass Thread::Current 1451 mov x3, sp // pass SP 1452 bl artQuickProxyInvokeHandler // (Method* proxy method, receiver, Thread*, SP) 1453 // Use xETR as xSELF might be scratched by native function above. 1454 ldr x2, [xETR, THREAD_EXCEPTION_OFFSET] 1455 cbnz x2, .Lexception_in_proxy // success if no exception is pending 1456 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Restore frame 1457 fmov d0, x0 // Store result in d0 in case it was float or double 1458 ret // return on success 1459.Lexception_in_proxy: 1460 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1461 DELIVER_PENDING_EXCEPTION 1462END art_quick_proxy_invoke_handler 1463 1464 /* 1465 * Called to resolve an imt conflict. xIP1 is a hidden argument that holds the target method's 1466 * dex method index. 1467 */ 1468ENTRY art_quick_imt_conflict_trampoline 1469 ldr x0, [sp, #0] // load caller Method* 1470 ldr w0, [x0, #ART_METHOD_DEX_CACHE_METHODS_OFFSET] // load dex_cache_resolved_methods 1471 add x0, x0, #MIRROR_LONG_ARRAY_DATA_OFFSET // get starting address of data 1472 ldr x0, [x0, xIP1, lsl 3] // load the target method 1473 b art_quick_invoke_interface_trampoline 1474END art_quick_imt_conflict_trampoline 1475 1476ENTRY art_quick_resolution_trampoline 1477 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1478 mov x2, xSELF 1479 mov x3, sp 1480 bl artQuickResolutionTrampoline // (called, receiver, Thread*, SP) 1481 cbz x0, 1f 1482 mov xIP0, x0 // Remember returned code pointer in xIP0. 1483 ldr x0, [sp, #0] // artQuickResolutionTrampoline puts called method in *SP. 1484 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1485 br xIP0 14861: 1487 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1488 DELIVER_PENDING_EXCEPTION 1489END art_quick_resolution_trampoline 1490 1491/* 1492 * Generic JNI frame layout: 1493 * 1494 * #-------------------# 1495 * | | 1496 * | caller method... | 1497 * #-------------------# <--- SP on entry 1498 * | Return X30/LR | 1499 * | X29/FP | callee save 1500 * | X28 | callee save 1501 * | X27 | callee save 1502 * | X26 | callee save 1503 * | X25 | callee save 1504 * | X24 | callee save 1505 * | X23 | callee save 1506 * | X22 | callee save 1507 * | X21 | callee save 1508 * | X20 | callee save 1509 * | X19 | callee save 1510 * | X7 | arg7 1511 * | X6 | arg6 1512 * | X5 | arg5 1513 * | X4 | arg4 1514 * | X3 | arg3 1515 * | X2 | arg2 1516 * | X1 | arg1 1517 * | D7 | float arg 8 1518 * | D6 | float arg 7 1519 * | D5 | float arg 6 1520 * | D4 | float arg 5 1521 * | D3 | float arg 4 1522 * | D2 | float arg 3 1523 * | D1 | float arg 2 1524 * | D0 | float arg 1 1525 * | Method* | <- X0 1526 * #-------------------# 1527 * | local ref cookie | // 4B 1528 * | handle scope size | // 4B 1529 * #-------------------# 1530 * | JNI Call Stack | 1531 * #-------------------# <--- SP on native call 1532 * | | 1533 * | Stack for Regs | The trampoline assembly will pop these values 1534 * | | into registers for native call 1535 * #-------------------# 1536 * | Native code ptr | 1537 * #-------------------# 1538 * | Free scratch | 1539 * #-------------------# 1540 * | Ptr to (1) | <--- SP 1541 * #-------------------# 1542 */ 1543 /* 1544 * Called to do a generic JNI down-call 1545 */ 1546ENTRY art_quick_generic_jni_trampoline 1547 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0 1548 1549 // Save SP , so we can have static CFI info. 1550 mov x28, sp 1551 .cfi_def_cfa_register x28 1552 1553 // This looks the same, but is different: this will be updated to point to the bottom 1554 // of the frame when the handle scope is inserted. 1555 mov xFP, sp 1556 1557 mov xIP0, #5120 1558 sub sp, sp, xIP0 1559 1560 // prepare for artQuickGenericJniTrampoline call 1561 // (Thread*, SP) 1562 // x0 x1 <= C calling convention 1563 // xSELF xFP <= where they are 1564 1565 mov x0, xSELF // Thread* 1566 mov x1, xFP 1567 bl artQuickGenericJniTrampoline // (Thread*, sp) 1568 1569 // The C call will have registered the complete save-frame on success. 1570 // The result of the call is: 1571 // x0: pointer to native code, 0 on error. 1572 // x1: pointer to the bottom of the used area of the alloca, can restore stack till there. 1573 1574 // Check for error = 0. 1575 cbz x0, .Lexception_in_native 1576 1577 // Release part of the alloca. 1578 mov sp, x1 1579 1580 // Save the code pointer 1581 mov xIP0, x0 1582 1583 // Load parameters from frame into registers. 1584 // TODO Check with artQuickGenericJniTrampoline. 1585 // Also, check again APPCS64 - the stack arguments are interleaved. 1586 ldp x0, x1, [sp] 1587 ldp x2, x3, [sp, #16] 1588 ldp x4, x5, [sp, #32] 1589 ldp x6, x7, [sp, #48] 1590 1591 ldp d0, d1, [sp, #64] 1592 ldp d2, d3, [sp, #80] 1593 ldp d4, d5, [sp, #96] 1594 ldp d6, d7, [sp, #112] 1595 1596 add sp, sp, #128 1597 1598 blr xIP0 // native call. 1599 1600 // result sign extension is handled in C code 1601 // prepare for artQuickGenericJniEndTrampoline call 1602 // (Thread*, result, result_f) 1603 // x0 x1 x2 <= C calling convention 1604 mov x1, x0 // Result (from saved) 1605 mov x0, xETR // Thread register, original xSELF might be scratched by native code. 1606 fmov x2, d0 // d0 will contain floating point result, but needs to go into x2 1607 1608 bl artQuickGenericJniEndTrampoline 1609 1610 // Pending exceptions possible. 1611 // Use xETR as xSELF might be scratched by native code 1612 ldr x2, [xETR, THREAD_EXCEPTION_OFFSET] 1613 cbnz x2, .Lexception_in_native 1614 1615 // Tear down the alloca. 1616 mov sp, x28 1617 .cfi_def_cfa_register sp 1618 1619 // Tear down the callee-save frame. 1620 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1621 1622 // store into fpr, for when it's a fpr return... 1623 fmov d0, x0 1624 ret 1625 1626.Lexception_in_native: 1627 // Restore xSELF. It might have been scratched by native code. 1628 mov xSELF, xETR 1629 // Move to x1 then sp to please assembler. 1630 ldr x1, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET] 1631 mov sp, x1 1632 .cfi_def_cfa_register sp 1633 # This will create a new save-all frame, required by the runtime. 1634 DELIVER_PENDING_EXCEPTION 1635END art_quick_generic_jni_trampoline 1636 1637/* 1638 * Called to bridge from the quick to interpreter ABI. On entry the arguments match those 1639 * of a quick call: 1640 * x0 = method being called/to bridge to. 1641 * x1..x7, d0..d7 = arguments to that method. 1642 */ 1643ENTRY art_quick_to_interpreter_bridge 1644 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Set up frame and save arguments. 1645 1646 // x0 will contain mirror::ArtMethod* method. 1647 mov x1, xSELF // How to get Thread::Current() ??? 1648 mov x2, sp 1649 1650 // uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 1651 // mirror::ArtMethod** sp) 1652 bl artQuickToInterpreterBridge 1653 1654 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // TODO: no need to restore arguments in this case. 1655 1656 fmov d0, x0 1657 1658 RETURN_OR_DELIVER_PENDING_EXCEPTION 1659END art_quick_to_interpreter_bridge 1660 1661 1662// 1663// Instrumentation-related stubs 1664// 1665 .extern artInstrumentationMethodEntryFromCode 1666ENTRY art_quick_instrumentation_entry 1667 SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME 1668 1669 mov x20, x0 // Preserve method reference in a callee-save. 1670 1671 mov x2, xSELF 1672 mov x3, xLR 1673 bl artInstrumentationMethodEntryFromCode // (Method*, Object*, Thread*, LR) 1674 1675 mov xIP0, x0 // x0 = result of call. 1676 mov x0, x20 // Reload method reference. 1677 1678 RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Note: will restore xSELF 1679 adr xLR, art_quick_instrumentation_exit 1680 br xIP0 // Tail-call method with lr set to art_quick_instrumentation_exit. 1681END art_quick_instrumentation_entry 1682 1683 .extern artInstrumentationMethodExitFromCode 1684ENTRY art_quick_instrumentation_exit 1685 mov xLR, #0 // Clobber LR for later checks. 1686 1687 SETUP_REFS_ONLY_CALLEE_SAVE_FRAME 1688 1689 // We need to save x0 and d0. We could use a callee-save from SETUP_REF_ONLY, but then 1690 // we would need to fully restore it. As there are a lot of callee-save registers, it seems 1691 // easier to have an extra small stack area. 1692 1693 str x0, [sp, #-16]! // Save integer result. 1694 .cfi_adjust_cfa_offset 16 1695 str d0, [sp, #8] // Save floating-point result. 1696 1697 add x1, sp, #16 // Pass SP. 1698 mov x2, x0 // Pass integer result. 1699 fmov x3, d0 // Pass floating-point result. 1700 mov x0, xSELF // Pass Thread. 1701 bl artInstrumentationMethodExitFromCode // (Thread*, SP, gpr_res, fpr_res) 1702 1703 mov xIP0, x0 // Return address from instrumentation call. 1704 mov xLR, x1 // r1 is holding link register if we're to bounce to deoptimize 1705 1706 ldr d0, [sp, #8] // Restore floating-point result. 1707 ldr x0, [sp], 16 // Restore integer result, and drop stack area. 1708 .cfi_adjust_cfa_offset 16 1709 1710 POP_REFS_ONLY_CALLEE_SAVE_FRAME 1711 1712 br xIP0 // Tail-call out. 1713END art_quick_instrumentation_exit 1714 1715 /* 1716 * Instrumentation has requested that we deoptimize into the interpreter. The deoptimization 1717 * will long jump to the upcall with a special exception of -1. 1718 */ 1719 .extern artDeoptimize 1720ENTRY art_quick_deoptimize 1721 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1722 mov x0, xSELF // Pass thread. 1723 bl artDeoptimize // artDeoptimize(Thread*) 1724 brk 0 1725END art_quick_deoptimize 1726 1727 1728 /* 1729 * String's indexOf. 1730 * 1731 * TODO: Not very optimized. 1732 * On entry: 1733 * x0: string object (known non-null) 1734 * w1: char to match (known <= 0xFFFF) 1735 * w2: Starting offset in string data 1736 */ 1737ENTRY art_quick_indexof 1738 ldr w3, [x0, #MIRROR_STRING_COUNT_OFFSET] 1739 add x0, x0, #MIRROR_STRING_VALUE_OFFSET 1740 1741 /* Clamp start to [0..count] */ 1742 cmp w2, #0 1743 csel w2, wzr, w2, lt 1744 cmp w2, w3 1745 csel w2, w3, w2, gt 1746 1747 /* Save a copy to compute result */ 1748 mov x5, x0 1749 1750 /* Build pointer to start of data to compare and pre-bias */ 1751 add x0, x0, x2, lsl #1 1752 sub x0, x0, #2 1753 1754 /* Compute iteration count */ 1755 sub w2, w3, w2 1756 1757 /* 1758 * At this point we have: 1759 * x0: start of the data to test 1760 * w1: char to compare 1761 * w2: iteration count 1762 * x5: original start of string data 1763 */ 1764 1765 subs w2, w2, #4 1766 b.lt .Lindexof_remainder 1767 1768.Lindexof_loop4: 1769 ldrh w6, [x0, #2]! 1770 ldrh w7, [x0, #2]! 1771 ldrh wIP0, [x0, #2]! 1772 ldrh wIP1, [x0, #2]! 1773 cmp w6, w1 1774 b.eq .Lmatch_0 1775 cmp w7, w1 1776 b.eq .Lmatch_1 1777 cmp wIP0, w1 1778 b.eq .Lmatch_2 1779 cmp wIP1, w1 1780 b.eq .Lmatch_3 1781 subs w2, w2, #4 1782 b.ge .Lindexof_loop4 1783 1784.Lindexof_remainder: 1785 adds w2, w2, #4 1786 b.eq .Lindexof_nomatch 1787 1788.Lindexof_loop1: 1789 ldrh w6, [x0, #2]! 1790 cmp w6, w1 1791 b.eq .Lmatch_3 1792 subs w2, w2, #1 1793 b.ne .Lindexof_loop1 1794 1795.Lindexof_nomatch: 1796 mov x0, #-1 1797 ret 1798 1799.Lmatch_0: 1800 sub x0, x0, #6 1801 sub x0, x0, x5 1802 asr x0, x0, #1 1803 ret 1804.Lmatch_1: 1805 sub x0, x0, #4 1806 sub x0, x0, x5 1807 asr x0, x0, #1 1808 ret 1809.Lmatch_2: 1810 sub x0, x0, #2 1811 sub x0, x0, x5 1812 asr x0, x0, #1 1813 ret 1814.Lmatch_3: 1815 sub x0, x0, x5 1816 asr x0, x0, #1 1817 ret 1818END art_quick_indexof 1819 1820 /* 1821 * String's compareTo. 1822 * 1823 * TODO: Not very optimized. 1824 * 1825 * On entry: 1826 * x0: this object pointer 1827 * x1: comp object pointer 1828 * 1829 */ 1830 .extern __memcmp16 1831ENTRY art_quick_string_compareto 1832 mov x2, x0 // x0 is return, use x2 for first input. 1833 sub x0, x2, x1 // Same string object? 1834 cbnz x0,1f 1835 ret 18361: // Different string objects. 1837 1838 ldr w4, [x2, #MIRROR_STRING_COUNT_OFFSET] 1839 ldr w3, [x1, #MIRROR_STRING_COUNT_OFFSET] 1840 add x2, x2, #MIRROR_STRING_VALUE_OFFSET 1841 add x1, x1, #MIRROR_STRING_VALUE_OFFSET 1842 1843 /* 1844 * Now: Data* Count 1845 * first arg x2 w4 1846 * second arg x1 w3 1847 */ 1848 1849 // x0 := str1.length(w4) - str2.length(w3). ldr zero-extended w3/w4 into x3/x4. 1850 subs x0, x4, x3 1851 // Min(count1, count2) into w3. 1852 csel x3, x3, x4, ge 1853 1854 // TODO: Tune this value. 1855 // Check for long string, do memcmp16 for them. 1856 cmp w3, #28 // Constant from arm32. 1857 bgt .Ldo_memcmp16 1858 1859 /* 1860 * Now: 1861 * x2: *first string data 1862 * x1: *second string data 1863 * w3: iteration count 1864 * x0: return value if comparison equal 1865 * x4, x5, x6, x7: free 1866 */ 1867 1868 // Do a simple unrolled loop. 1869.Lloop: 1870 // At least two more elements? 1871 subs w3, w3, #2 1872 b.lt .Lremainder_or_done 1873 1874 ldrh w4, [x2], #2 1875 ldrh w5, [x1], #2 1876 1877 ldrh w6, [x2], #2 1878 ldrh w7, [x1], #2 1879 1880 subs w4, w4, w5 1881 b.ne .Lw4_result 1882 1883 subs w6, w6, w7 1884 b.ne .Lw6_result 1885 1886 b .Lloop 1887 1888.Lremainder_or_done: 1889 adds w3, w3, #1 1890 b.eq .Lremainder 1891 ret 1892 1893.Lremainder: 1894 ldrh w4, [x2], #2 1895 ldrh w5, [x1], #2 1896 subs w4, w4, w5 1897 b.ne .Lw4_result 1898 ret 1899 1900// Result is in w4 1901.Lw4_result: 1902 sxtw x0, w4 1903 ret 1904 1905// Result is in w6 1906.Lw6_result: 1907 sxtw x0, w6 1908 ret 1909 1910.Ldo_memcmp16: 1911 mov x14, x0 // Save x0 and LR. __memcmp16 does not use these temps. 1912 mov x15, xLR // TODO: Codify and check that? 1913 1914 mov x0, x2 1915 uxtw x2, w3 1916 bl __memcmp16 1917 1918 mov xLR, x15 // Restore LR. 1919 1920 cmp x0, #0 // Check the memcmp difference. 1921 csel x0, x0, x14, ne // x0 := x0 != 0 ? x14(prev x0=length diff) : x1. 1922 ret 1923END art_quick_string_compareto 1924 1925// Macro to facilitate adding new entrypoints which call to native function directly. 1926// Currently, xSELF is the only thing we need to take care of between managed code and AAPCS. 1927// But we might introduce more differences. 1928.macro NATIVE_DOWNCALL name, entrypoint 1929 .extern \entrypoint 1930ENTRY \name 1931 stp xSELF, xLR, [sp, #-16]! 1932 bl \entrypoint 1933 ldp xSELF, xLR, [sp], #16 1934 ret 1935END \name 1936.endm 1937 1938NATIVE_DOWNCALL art_quick_fmod fmod 1939NATIVE_DOWNCALL art_quick_fmodf fmodf 1940NATIVE_DOWNCALL art_quick_memcpy memcpy 1941NATIVE_DOWNCALL art_quick_assignable_from_code artIsAssignableFromCode 1942