quick_entrypoints_arm64.S revision ec1694ddb034c4b86da59e9ba989ac1d8af2845c
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 xIP0, [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 // Reserved registers 52 stp xSELF, xSUSPEND, [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.endm 83 84 /* 85 * Macro that sets up the callee save frame to conform with 86 * Runtime::CreateCalleeSaveMethod(kRefsOnly). 87 */ 88.macro SETUP_REF_ONLY_CALLEE_SAVE_FRAME 89 adrp xIP0, :got:_ZN3art7Runtime9instance_E 90 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 91 92 // Our registers aren't intermixed - just spill in order. 93 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 94 95 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 96 THIS_LOAD_REQUIRES_READ_BARRIER 97 ldr xIP0, [xIP0, RUNTIME_REFS_ONLY_CALLEE_SAVE_FRAME_OFFSET ] 98 99 sub sp, sp, #96 100 .cfi_adjust_cfa_offset 96 101 102 // Ugly compile-time check, but we only have the preprocessor. 103#if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 96) 104#error "REFS_ONLY_CALLEE_SAVE_FRAME(ARM64) size not as expected." 105#endif 106 107 // Callee-saves 108 stp x20, x21, [sp, #8] 109 .cfi_rel_offset x20, 8 110 .cfi_rel_offset x21, 16 111 112 stp x22, x23, [sp, #24] 113 .cfi_rel_offset x22, 24 114 .cfi_rel_offset x23, 32 115 116 stp x24, x25, [sp, #40] 117 .cfi_rel_offset x24, 40 118 .cfi_rel_offset x25, 48 119 120 stp x26, x27, [sp, #56] 121 .cfi_rel_offset x26, 56 122 .cfi_rel_offset x27, 64 123 124 stp x28, x29, [sp, #72] 125 .cfi_rel_offset x28, 72 126 .cfi_rel_offset x29, 80 127 128 // LR 129 str xLR, [sp, #88] 130 .cfi_rel_offset x30, 88 131 132 // Save xSELF to xETR. 133 mov xETR, xSELF 134 135 // Loads appropriate callee-save-method 136 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 137.endm 138 139// TODO: Probably no need to restore registers preserved by aapcs64. 140.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 141 // Restore xSELF. 142 mov xSELF, xETR 143 144 // Callee-saves 145 ldp x20, x21, [sp, #8] 146 .cfi_restore x20 147 .cfi_restore x21 148 149 ldp x22, x23, [sp, #24] 150 .cfi_restore x22 151 .cfi_restore x23 152 153 ldp x24, x25, [sp, #40] 154 .cfi_restore x24 155 .cfi_restore x25 156 157 ldp x26, x27, [sp, #56] 158 .cfi_restore x26 159 .cfi_restore x27 160 161 ldp x28, x29, [sp, #72] 162 .cfi_restore x28 163 .cfi_restore x29 164 165 // LR 166 ldr xLR, [sp, #88] 167 .cfi_restore x30 168 169 add sp, sp, #96 170 .cfi_adjust_cfa_offset -96 171.endm 172 173.macro POP_REF_ONLY_CALLEE_SAVE_FRAME 174 // Restore xSELF as it might be scratched. 175 mov xSELF, xETR 176 // ETR 177 ldr xETR, [sp, #16] 178 .cfi_restore x21 179 180 add sp, sp, #96 181 .cfi_adjust_cfa_offset -96 182.endm 183 184.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 185 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 186 ret 187.endm 188 189 190.macro SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 191 sub sp, sp, #224 192 .cfi_adjust_cfa_offset 224 193 194 // Ugly compile-time check, but we only have the preprocessor. 195#if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 224) 196#error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(ARM64) size not as expected." 197#endif 198 199 // FP args 200 stp d0, d1, [sp, #16] 201 stp d2, d3, [sp, #32] 202 stp d4, d5, [sp, #48] 203 stp d6, d7, [sp, #64] 204 205 // args and x20(callee-save) 206 stp x1, x2, [sp, #80] 207 .cfi_rel_offset x1, 80 208 .cfi_rel_offset x2, 88 209 210 stp x3, x4, [sp, #96] 211 .cfi_rel_offset x3, 96 212 .cfi_rel_offset x4, 104 213 214 stp x5, x6, [sp, #112] 215 .cfi_rel_offset x5, 112 216 .cfi_rel_offset x6, 120 217 218 stp x7, x20, [sp, #128] 219 .cfi_rel_offset x7, 128 220 .cfi_rel_offset x20, 136 221 222 // Callee-saves. 223 stp x21, x22, [sp, #144] 224 .cfi_rel_offset x21, 144 225 .cfi_rel_offset x22, 152 226 227 stp x23, x24, [sp, #160] 228 .cfi_rel_offset x23, 160 229 .cfi_rel_offset x24, 168 230 231 stp x25, x26, [sp, #176] 232 .cfi_rel_offset x25, 176 233 .cfi_rel_offset x26, 184 234 235 stp x27, x28, [sp, #192] 236 .cfi_rel_offset x27, 192 237 .cfi_rel_offset x28, 200 238 239 // x29(callee-save) and LR 240 stp x29, xLR, [sp, #208] 241 .cfi_rel_offset x29, 208 242 .cfi_rel_offset x30, 216 243 244 // Save xSELF to xETR. 245 mov xETR, xSELF 246.endm 247 248 /* 249 * Macro that sets up the callee save frame to conform with 250 * Runtime::CreateCalleeSaveMethod(kRefsAndArgs). 251 * 252 * TODO This is probably too conservative - saving FP & LR. 253 */ 254.macro SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 255 adrp xIP0, :got:_ZN3art7Runtime9instance_E 256 ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E] 257 258 // Our registers aren't intermixed - just spill in order. 259 ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) . 260 261 // xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 262 THIS_LOAD_REQUIRES_READ_BARRIER 263 ldr xIP0, [xIP0, RUNTIME_REF_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET ] 264 265 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 266 267 str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 268.endm 269 270// TODO: Probably no need to restore registers preserved by aapcs64. 271.macro RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 272 // Restore xSELF. 273 mov xSELF, xETR 274 275 // FP args 276 ldp d0, d1, [sp, #16] 277 ldp d2, d3, [sp, #32] 278 ldp d4, d5, [sp, #48] 279 ldp d6, d7, [sp, #64] 280 281 // args and x20(callee-save) 282 ldp x1, x2, [sp, #80] 283 .cfi_restore x1 284 .cfi_restore x2 285 286 ldp x3, x4, [sp, #96] 287 .cfi_restore x3 288 .cfi_restore x4 289 290 ldp x5, x6, [sp, #112] 291 .cfi_restore x5 292 .cfi_restore x6 293 294 ldp x7, x20, [sp, #128] 295 .cfi_restore x7 296 .cfi_restore x20 297 298 // Callee-saves. 299 ldp x21, x22, [sp, #144] 300 .cfi_restore x21 301 .cfi_restore x22 302 303 ldp x23, x24, [sp, #160] 304 .cfi_restore x23 305 .cfi_restore x24 306 307 ldp x25, x26, [sp, #176] 308 .cfi_restore x25 309 .cfi_restore x26 310 311 ldp x27, x28, [sp, #192] 312 .cfi_restore x27 313 .cfi_restore x28 314 315 // x29(callee-save) and LR 316 ldp x29, xLR, [sp, #208] 317 .cfi_restore x29 318 .cfi_restore x30 319 320 add sp, sp, #224 321 .cfi_adjust_cfa_offset -224 322.endm 323 324.macro RETURN_IF_RESULT_IS_ZERO 325 cbnz x0, 1f // result non-zero branch over 326 ret // return 3271: 328.endm 329 330.macro RETURN_IF_RESULT_IS_NON_ZERO 331 cbz x0, 1f // result zero branch over 332 ret // return 3331: 334.endm 335 336 /* 337 * Macro that set calls through to artDeliverPendingExceptionFromCode, where the pending 338 * exception is Thread::Current()->exception_ 339 */ 340.macro DELIVER_PENDING_EXCEPTION 341 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 342 mov x0, xSELF 343 mov x1, sp 344 345 // Point of no return. 346 b artDeliverPendingExceptionFromCode // artDeliverPendingExceptionFromCode(Thread*, SP) 347 brk 0 // Unreached 348.endm 349 350.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_REG reg 351 ldr \reg, [xSELF, # THREAD_EXCEPTION_OFFSET] // Get exception field. 352 cbnz \reg, 1f 353 ret 3541: 355 DELIVER_PENDING_EXCEPTION 356.endm 357 358.macro RETURN_OR_DELIVER_PENDING_EXCEPTION 359 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG xIP0 360.endm 361 362// Same as above with x1. This is helpful in stubs that want to avoid clobbering another register. 363.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 364 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG x1 365.endm 366 367.macro RETURN_IF_W0_IS_ZERO_OR_DELIVER 368 cbnz w0, 1f // result non-zero branch over 369 ret // return 3701: 371 DELIVER_PENDING_EXCEPTION 372.endm 373 374.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 375 .extern \cxx_name 376ENTRY \c_name 377 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 378 mov x0, xSELF // pass Thread::Current 379 mov x1, sp // pass SP 380 b \cxx_name // \cxx_name(Thread*, SP) 381END \c_name 382.endm 383 384.macro ONE_ARG_RUNTIME_EXCEPTION c_name, cxx_name 385 .extern \cxx_name 386ENTRY \c_name 387 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context. 388 mov x1, xSELF // pass Thread::Current. 389 mov x2, sp // pass SP. 390 b \cxx_name // \cxx_name(arg, Thread*, SP). 391 brk 0 392END \c_name 393.endm 394 395.macro TWO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 396 .extern \cxx_name 397ENTRY \c_name 398 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 399 mov x2, xSELF // pass Thread::Current 400 mov x3, sp // pass SP 401 b \cxx_name // \cxx_name(arg1, arg2, Thread*, SP) 402 brk 0 403END \c_name 404.endm 405 406 /* 407 * Called by managed code, saves callee saves and then calls artThrowException 408 * that will place a mock Method* at the bottom of the stack. Arg1 holds the exception. 409 */ 410ONE_ARG_RUNTIME_EXCEPTION art_quick_deliver_exception, artDeliverExceptionFromCode 411 412 /* 413 * Called by managed code to create and deliver a NullPointerException. 414 */ 415NO_ARG_RUNTIME_EXCEPTION art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode 416 417 /* 418 * Called by managed code to create and deliver an ArithmeticException. 419 */ 420NO_ARG_RUNTIME_EXCEPTION art_quick_throw_div_zero, artThrowDivZeroFromCode 421 422 /* 423 * Called by managed code to create and deliver an ArrayIndexOutOfBoundsException. Arg1 holds 424 * index, arg2 holds limit. 425 */ 426TWO_ARG_RUNTIME_EXCEPTION art_quick_throw_array_bounds, artThrowArrayBoundsFromCode 427 428 /* 429 * Called by managed code to create and deliver a StackOverflowError. 430 */ 431NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode 432 433 /* 434 * Called by managed code to create and deliver a NoSuchMethodError. 435 */ 436ONE_ARG_RUNTIME_EXCEPTION art_quick_throw_no_such_method, artThrowNoSuchMethodFromCode 437 438 /* 439 * All generated callsites for interface invokes and invocation slow paths will load arguments 440 * as usual - except instead of loading arg0/x0 with the target Method*, arg0/x0 will contain 441 * the method_idx. This wrapper will save arg1-arg3, load the caller's Method*, align the 442 * stack and call the appropriate C helper. 443 * NOTE: "this" is first visible argument of the target, and so can be found in arg1/x1. 444 * 445 * The helper will attempt to locate the target and return a 128-bit result in x0/x1 consisting 446 * of the target Method* in x0 and method->code_ in x1. 447 * 448 * If unsuccessful, the helper will return NULL/????. There will be a pending exception in the 449 * thread and we branch to another stub to deliver it. 450 * 451 * On success this wrapper will restore arguments and *jump* to the target, leaving the lr 452 * pointing back to the original caller. 453 * 454 * Adapted from ARM32 code. 455 * 456 * Clobbers xIP0. 457 */ 458.macro INVOKE_TRAMPOLINE c_name, cxx_name 459 .extern \cxx_name 460ENTRY \c_name 461 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME // save callee saves in case allocation triggers GC 462 // Helper signature is always 463 // (method_idx, *this_object, *caller_method, *self, sp) 464 465 ldr w2, [sp, #FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE] // pass caller Method* 466 mov x3, xSELF // pass Thread::Current 467 mov x4, sp 468 bl \cxx_name // (method_idx, this, caller, Thread*, SP) 469 mov xIP0, x1 // save Method*->code_ 470 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 471 cbz x0, 1f // did we find the target? if not go to exception delivery 472 br xIP0 // tail call to target 4731: 474 DELIVER_PENDING_EXCEPTION 475END \c_name 476.endm 477 478INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline, artInvokeInterfaceTrampoline 479INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline_with_access_check, artInvokeInterfaceTrampolineWithAccessCheck 480 481INVOKE_TRAMPOLINE art_quick_invoke_static_trampoline_with_access_check, artInvokeStaticTrampolineWithAccessCheck 482INVOKE_TRAMPOLINE art_quick_invoke_direct_trampoline_with_access_check, artInvokeDirectTrampolineWithAccessCheck 483INVOKE_TRAMPOLINE art_quick_invoke_super_trampoline_with_access_check, artInvokeSuperTrampolineWithAccessCheck 484INVOKE_TRAMPOLINE art_quick_invoke_virtual_trampoline_with_access_check, artInvokeVirtualTrampolineWithAccessCheck 485 486 487.macro INVOKE_STUB_CREATE_FRAME 488 489SAVE_SIZE=6*8 // x4, x5, xSUSPEND, SP, LR & FP saved. 490SAVE_SIZE_AND_METHOD=SAVE_SIZE+STACK_REFERENCE_SIZE 491 492 493 mov x9, sp // Save stack pointer. 494 .cfi_register sp,x9 495 496 add x10, x2, # SAVE_SIZE_AND_METHOD // calculate size of frame. 497 sub x10, sp, x10 // Calculate SP position - saves + ArtMethod* + args 498 and x10, x10, # ~0xf // Enforce 16 byte stack alignment. 499 mov sp, x10 // Set new SP. 500 501 sub x10, x9, #SAVE_SIZE // Calculate new FP (later). Done here as we must move SP 502 .cfi_def_cfa_register x10 // before this. 503 .cfi_adjust_cfa_offset SAVE_SIZE 504 505 stp x9, xSUSPEND, [x10, #32] // Save old stack pointer and xSUSPEND 506 .cfi_rel_offset sp, 32 507 .cfi_rel_offset x19, 40 508 509 stp x4, x5, [x10, #16] // Save result and shorty addresses. 510 .cfi_rel_offset x4, 16 511 .cfi_rel_offset x5, 24 512 513 stp xFP, xLR, [x10] // Store LR & FP. 514 .cfi_rel_offset x29, 0 515 .cfi_rel_offset x30, 8 516 517 mov xFP, x10 // Use xFP now, as it's callee-saved. 518 .cfi_def_cfa_register x29 519 mov xSELF, x3 // Move thread pointer into SELF register. 520 mov wSUSPEND, #SUSPEND_CHECK_INTERVAL // reset wSUSPEND to suspend check interval 521 522 // Copy arguments into stack frame. 523 // Use simple copy routine for now. 524 // 4 bytes per slot. 525 // X1 - source address 526 // W2 - args length 527 // X9 - destination address. 528 // W10 - temporary 529 add x9, sp, #4 // Destination address is bottom of stack + NULL. 530 531 // Use \@ to differentiate between macro invocations. 532.LcopyParams\@: 533 cmp w2, #0 534 beq .LendCopyParams\@ 535 sub w2, w2, #4 // Need 65536 bytes of range. 536 ldr w10, [x1, x2] 537 str w10, [x9, x2] 538 539 b .LcopyParams\@ 540 541.LendCopyParams\@: 542 543 // Store NULL into StackReference<Method>* at bottom of frame. 544 str wzr, [sp] 545 546#if (STACK_REFERENCE_SIZE != 4) 547#error "STACK_REFERENCE_SIZE(ARM64) size not as expected." 548#endif 549.endm 550 551.macro INVOKE_STUB_CALL_AND_RETURN 552 553 // load method-> METHOD_QUICK_CODE_OFFSET 554 ldr x9, [x0 , #METHOD_QUICK_CODE_OFFSET] 555 // Branch to method. 556 blr x9 557 558 // Restore return value address and shorty address. 559 ldp x4,x5, [xFP, #16] 560 .cfi_restore x4 561 .cfi_restore x5 562 563 // Store result (w0/x0/s0/d0) appropriately, depending on resultType. 564 ldrb w10, [x5] 565 566 // Don't set anything for a void type. 567 cmp w10, #'V' 568 beq .Lexit_art_quick_invoke_stub\@ 569 570 cmp w10, #'D' 571 bne .Lreturn_is_float\@ 572 str d0, [x4] 573 b .Lexit_art_quick_invoke_stub\@ 574 575.Lreturn_is_float\@: 576 cmp w10, #'F' 577 bne .Lreturn_is_int\@ 578 str s0, [x4] 579 b .Lexit_art_quick_invoke_stub\@ 580 581 // Just store x0. Doesn't matter if it is 64 or 32 bits. 582.Lreturn_is_int\@: 583 str x0, [x4] 584 585.Lexit_art_quick_invoke_stub\@: 586 ldp x2, xSUSPEND, [xFP, #32] // Restore stack pointer and xSUSPEND. 587 .cfi_restore x19 588 mov sp, x2 589 .cfi_restore sp 590 591 ldp xFP, xLR, [xFP] // Restore old frame pointer and link register. 592 .cfi_restore x29 593 .cfi_restore x30 594 595 ret 596 597.endm 598 599 600/* 601 * extern"C" void art_quick_invoke_stub(ArtMethod *method, x0 602 * uint32_t *args, x1 603 * uint32_t argsize, w2 604 * Thread *self, x3 605 * JValue *result, x4 606 * char *shorty); x5 607 * +----------------------+ 608 * | | 609 * | C/C++ frame | 610 * | LR'' | 611 * | FP'' | <- SP' 612 * +----------------------+ 613 * +----------------------+ 614 * | x19 | <- Used as wSUSPEND, won't be restored by managed code. 615 * | SP' | 616 * | X5 | 617 * | X4 | Saved registers 618 * | LR' | 619 * | FP' | <- FP 620 * +----------------------+ 621 * | uint32_t out[n-1] | 622 * | : : | Outs 623 * | uint32_t out[0] | 624 * | StackRef<ArtMethod> | <- SP value=null 625 * +----------------------+ 626 * 627 * Outgoing registers: 628 * x0 - Method* 629 * x1-x7 - integer parameters. 630 * d0-d7 - Floating point parameters. 631 * xSELF = self 632 * wSUSPEND = suspend count 633 * SP = & of ArtMethod* 634 * x1 = "this" pointer. 635 * 636 */ 637ENTRY art_quick_invoke_stub 638 // Spill registers as per AACPS64 calling convention. 639 INVOKE_STUB_CREATE_FRAME 640 641 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 642 // Parse the passed shorty to determine which register to load. 643 // Load addresses for routines that load WXSD registers. 644 adr x11, .LstoreW2 645 adr x12, .LstoreX2 646 adr x13, .LstoreS0 647 adr x14, .LstoreD0 648 649 // Initialize routine offsets to 0 for integers and floats. 650 // x8 for integers, x15 for floating point. 651 mov x8, #0 652 mov x15, #0 653 654 add x10, x5, #1 // Load shorty address, plus one to skip return value. 655 ldr w1, [x9],#4 // Load "this" parameter, and increment arg pointer. 656 657 // Loop to fill registers. 658.LfillRegisters: 659 ldrb w17, [x10], #1 // Load next character in signature, and increment. 660 cbz w17, .LcallFunction // Exit at end of signature. Shorty 0 terminated. 661 662 cmp w17, #'F' // is this a float? 663 bne .LisDouble 664 665 cmp x15, # 8*12 // Skip this load if all registers full. 666 beq .Ladvance4 667 668 add x17, x13, x15 // Calculate subroutine to jump to. 669 br x17 670 671.LisDouble: 672 cmp w17, #'D' // is this a double? 673 bne .LisLong 674 675 cmp x15, # 8*12 // Skip this load if all registers full. 676 beq .Ladvance8 677 678 add x17, x14, x15 // Calculate subroutine to jump to. 679 br x17 680 681.LisLong: 682 cmp w17, #'J' // is this a long? 683 bne .LisOther 684 685 cmp x8, # 6*12 // Skip this load if all registers full. 686 beq .Ladvance8 687 688 add x17, x12, x8 // Calculate subroutine to jump to. 689 br x17 690 691.LisOther: // Everything else takes one vReg. 692 cmp x8, # 6*12 // Skip this load if all registers full. 693 beq .Ladvance4 694 695 add x17, x11, x8 // Calculate subroutine to jump to. 696 br x17 697 698.Ladvance4: 699 add x9, x9, #4 700 b .LfillRegisters 701 702.Ladvance8: 703 add x9, x9, #8 704 b .LfillRegisters 705 706// Macro for loading a parameter into a register. 707// counter - the register with offset into these tables 708// size - the size of the register - 4 or 8 bytes. 709// register - the name of the register to be loaded. 710.macro LOADREG counter size register return 711 ldr \register , [x9], #\size 712 add \counter, \counter, 12 713 b \return 714.endm 715 716// Store ints. 717.LstoreW2: 718 LOADREG x8 4 w2 .LfillRegisters 719 LOADREG x8 4 w3 .LfillRegisters 720 LOADREG x8 4 w4 .LfillRegisters 721 LOADREG x8 4 w5 .LfillRegisters 722 LOADREG x8 4 w6 .LfillRegisters 723 LOADREG x8 4 w7 .LfillRegisters 724 725// Store longs. 726.LstoreX2: 727 LOADREG x8 8 x2 .LfillRegisters 728 LOADREG x8 8 x3 .LfillRegisters 729 LOADREG x8 8 x4 .LfillRegisters 730 LOADREG x8 8 x5 .LfillRegisters 731 LOADREG x8 8 x6 .LfillRegisters 732 LOADREG x8 8 x7 .LfillRegisters 733 734// Store singles. 735.LstoreS0: 736 LOADREG x15 4 s0 .LfillRegisters 737 LOADREG x15 4 s1 .LfillRegisters 738 LOADREG x15 4 s2 .LfillRegisters 739 LOADREG x15 4 s3 .LfillRegisters 740 LOADREG x15 4 s4 .LfillRegisters 741 LOADREG x15 4 s5 .LfillRegisters 742 LOADREG x15 4 s6 .LfillRegisters 743 LOADREG x15 4 s7 .LfillRegisters 744 745// Store doubles. 746.LstoreD0: 747 LOADREG x15 8 d0 .LfillRegisters 748 LOADREG x15 8 d1 .LfillRegisters 749 LOADREG x15 8 d2 .LfillRegisters 750 LOADREG x15 8 d3 .LfillRegisters 751 LOADREG x15 8 d4 .LfillRegisters 752 LOADREG x15 8 d5 .LfillRegisters 753 LOADREG x15 8 d6 .LfillRegisters 754 LOADREG x15 8 d7 .LfillRegisters 755 756 757.LcallFunction: 758 759 INVOKE_STUB_CALL_AND_RETURN 760 761END art_quick_invoke_stub 762 763/* extern"C" 764 * void art_quick_invoke_static_stub(ArtMethod *method, x0 765 * uint32_t *args, x1 766 * uint32_t argsize, w2 767 * Thread *self, x3 768 * JValue *result, x4 769 * char *shorty); x5 770 */ 771ENTRY art_quick_invoke_static_stub 772 // Spill registers as per AACPS64 calling convention. 773 INVOKE_STUB_CREATE_FRAME 774 775 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 776 // Parse the passed shorty to determine which register to load. 777 // Load addresses for routines that load WXSD registers. 778 adr x11, .LstoreW1_2 779 adr x12, .LstoreX1_2 780 adr x13, .LstoreS0_2 781 adr x14, .LstoreD0_2 782 783 // Initialize routine offsets to 0 for integers and floats. 784 // x8 for integers, x15 for floating point. 785 mov x8, #0 786 mov x15, #0 787 788 add x10, x5, #1 // Load shorty address, plus one to skip return value. 789 790 // Loop to fill registers. 791.LfillRegisters2: 792 ldrb w17, [x10], #1 // Load next character in signature, and increment. 793 cbz w17, .LcallFunction2 // Exit at end of signature. Shorty 0 terminated. 794 795 cmp w17, #'F' // is this a float? 796 bne .LisDouble2 797 798 cmp x15, # 8*12 // Skip this load if all registers full. 799 beq .Ladvance4_2 800 801 add x17, x13, x15 // Calculate subroutine to jump to. 802 br x17 803 804.LisDouble2: 805 cmp w17, #'D' // is this a double? 806 bne .LisLong2 807 808 cmp x15, # 8*12 // Skip this load if all registers full. 809 beq .Ladvance8_2 810 811 add x17, x14, x15 // Calculate subroutine to jump to. 812 br x17 813 814.LisLong2: 815 cmp w17, #'J' // is this a long? 816 bne .LisOther2 817 818 cmp x8, # 7*12 // Skip this load if all registers full. 819 beq .Ladvance8_2 820 821 add x17, x12, x8 // Calculate subroutine to jump to. 822 br x17 823 824.LisOther2: // Everything else takes one vReg. 825 cmp x8, # 7*12 // Skip this load if all registers full. 826 beq .Ladvance4_2 827 828 add x17, x11, x8 // Calculate subroutine to jump to. 829 br x17 830 831.Ladvance4_2: 832 add x9, x9, #4 833 b .LfillRegisters2 834 835.Ladvance8_2: 836 add x9, x9, #8 837 b .LfillRegisters2 838 839// Store ints. 840.LstoreW1_2: 841 LOADREG x8 4 w1 .LfillRegisters2 842 LOADREG x8 4 w2 .LfillRegisters2 843 LOADREG x8 4 w3 .LfillRegisters2 844 LOADREG x8 4 w4 .LfillRegisters2 845 LOADREG x8 4 w5 .LfillRegisters2 846 LOADREG x8 4 w6 .LfillRegisters2 847 LOADREG x8 4 w7 .LfillRegisters2 848 849// Store longs. 850.LstoreX1_2: 851 LOADREG x8 8 x1 .LfillRegisters2 852 LOADREG x8 8 x2 .LfillRegisters2 853 LOADREG x8 8 x3 .LfillRegisters2 854 LOADREG x8 8 x4 .LfillRegisters2 855 LOADREG x8 8 x5 .LfillRegisters2 856 LOADREG x8 8 x6 .LfillRegisters2 857 LOADREG x8 8 x7 .LfillRegisters2 858 859// Store singles. 860.LstoreS0_2: 861 LOADREG x15 4 s0 .LfillRegisters2 862 LOADREG x15 4 s1 .LfillRegisters2 863 LOADREG x15 4 s2 .LfillRegisters2 864 LOADREG x15 4 s3 .LfillRegisters2 865 LOADREG x15 4 s4 .LfillRegisters2 866 LOADREG x15 4 s5 .LfillRegisters2 867 LOADREG x15 4 s6 .LfillRegisters2 868 LOADREG x15 4 s7 .LfillRegisters2 869 870// Store doubles. 871.LstoreD0_2: 872 LOADREG x15 8 d0 .LfillRegisters2 873 LOADREG x15 8 d1 .LfillRegisters2 874 LOADREG x15 8 d2 .LfillRegisters2 875 LOADREG x15 8 d3 .LfillRegisters2 876 LOADREG x15 8 d4 .LfillRegisters2 877 LOADREG x15 8 d5 .LfillRegisters2 878 LOADREG x15 8 d6 .LfillRegisters2 879 LOADREG x15 8 d7 .LfillRegisters2 880 881 882.LcallFunction2: 883 884 INVOKE_STUB_CALL_AND_RETURN 885 886END art_quick_invoke_static_stub 887 888 889 890 /* 891 * On entry x0 is uintptr_t* gprs_ and x1 is uint64_t* fprs_ 892 */ 893 894ENTRY art_quick_do_long_jump 895 // Load FPRs 896 ldp d0, d1, [x1], #16 897 ldp d2, d3, [x1], #16 898 ldp d4, d5, [x1], #16 899 ldp d6, d7, [x1], #16 900 ldp d8, d9, [x1], #16 901 ldp d10, d11, [x1], #16 902 ldp d12, d13, [x1], #16 903 ldp d14, d15, [x1], #16 904 ldp d16, d17, [x1], #16 905 ldp d18, d19, [x1], #16 906 ldp d20, d21, [x1], #16 907 ldp d22, d23, [x1], #16 908 ldp d24, d25, [x1], #16 909 ldp d26, d27, [x1], #16 910 ldp d28, d29, [x1], #16 911 ldp d30, d31, [x1] 912 913 // Load GPRs 914 // TODO: lots of those are smashed, could optimize. 915 add x0, x0, #30*8 916 ldp x30, x1, [x0], #-16 917 ldp x28, x29, [x0], #-16 918 ldp x26, x27, [x0], #-16 919 ldp x24, x25, [x0], #-16 920 ldp x22, x23, [x0], #-16 921 ldp x20, x21, [x0], #-16 922 ldp x18, x19, [x0], #-16 923 ldp x16, x17, [x0], #-16 924 ldp x14, x15, [x0], #-16 925 ldp x12, x13, [x0], #-16 926 ldp x10, x11, [x0], #-16 927 ldp x8, x9, [x0], #-16 928 ldp x6, x7, [x0], #-16 929 ldp x4, x5, [x0], #-16 930 ldp x2, x3, [x0], #-16 931 mov sp, x1 932 933 // TODO: Is it really OK to use LR for the target PC? 934 mov x0, #0 935 mov x1, #0 936 br xLR 937END art_quick_do_long_jump 938 939 /* 940 * Entry from managed code that calls artLockObjectFromCode, may block for GC. x0 holds the 941 * possibly null object to lock. 942 * 943 * Derived from arm32 code. 944 */ 945 .extern artLockObjectFromCode 946ENTRY art_quick_lock_object 947 cbz w0, .Lslow_lock 948 add x4, x0, #LOCK_WORD_OFFSET // exclusive load/store had no immediate anymore 949.Lretry_lock: 950 ldr w2, [xSELF, #THREAD_ID_OFFSET] // TODO: Can the thread ID really change during the loop? 951 ldxr w1, [x4] 952 cbnz w1, .Lnot_unlocked // already thin locked 953 stxr w3, w2, [x4] 954 cbnz w3, .Lstrex_fail // store failed, retry 955 dmb ishld // full (LoadLoad|LoadStore) memory barrier 956 ret 957.Lstrex_fail: 958 b .Lretry_lock // unlikely forward branch, need to reload and recheck r1/r2 959.Lnot_unlocked: 960 lsr w3, w1, 30 961 cbnz w3, .Lslow_lock // if either of the top two bits are set, go slow path 962 eor w2, w1, w2 // lock_word.ThreadId() ^ self->ThreadId() 963 uxth w2, w2 // zero top 16 bits 964 cbnz w2, .Lslow_lock // lock word and self thread id's match -> recursive lock 965 // else contention, go to slow path 966 add w2, w1, #65536 // increment count in lock word placing in w2 for storing 967 lsr w1, w2, 30 // if either of the top two bits are set, we overflowed. 968 cbnz w1, .Lslow_lock // if we overflow the count go slow path 969 str w2, [x0, #LOCK_WORD_OFFSET]// no need for stxr as we hold the lock 970 ret 971.Lslow_lock: 972 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case we block 973 mov x1, xSELF // pass Thread::Current 974 mov x2, sp // pass SP 975 bl artLockObjectFromCode // (Object* obj, Thread*, SP) 976 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 977 RETURN_IF_W0_IS_ZERO_OR_DELIVER 978END art_quick_lock_object 979 980 /* 981 * Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure. 982 * x0 holds the possibly null object to lock. 983 * 984 * Derived from arm32 code. 985 */ 986 .extern artUnlockObjectFromCode 987ENTRY art_quick_unlock_object 988 cbz x0, .Lslow_unlock 989 ldr w1, [x0, #LOCK_WORD_OFFSET] 990 lsr w2, w1, 30 991 cbnz w2, .Lslow_unlock // if either of the top two bits are set, go slow path 992 ldr w2, [xSELF, #THREAD_ID_OFFSET] 993 eor w3, w1, w2 // lock_word.ThreadId() ^ self->ThreadId() 994 uxth w3, w3 // zero top 16 bits 995 cbnz w3, .Lslow_unlock // do lock word and self thread id's match? 996 cmp w1, #65536 997 bpl .Lrecursive_thin_unlock 998 // transition to unlocked, w3 holds 0 999 dmb ish // full (LoadStore|StoreStore) memory barrier 1000 str w3, [x0, #LOCK_WORD_OFFSET] 1001 ret 1002.Lrecursive_thin_unlock: 1003 sub w1, w1, #65536 1004 str w1, [x0, #LOCK_WORD_OFFSET] 1005 ret 1006.Lslow_unlock: 1007 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case exception allocation triggers GC 1008 mov x1, xSELF // pass Thread::Current 1009 mov x2, sp // pass SP 1010 bl artUnlockObjectFromCode // (Object* obj, Thread*, SP) 1011 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1012 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1013END art_quick_unlock_object 1014 1015 /* 1016 * Entry from managed code that calls artIsAssignableFromCode and on failure calls 1017 * artThrowClassCastException. 1018 */ 1019 .extern artThrowClassCastException 1020ENTRY art_quick_check_cast 1021 // Store arguments and link register 1022 sub sp, sp, #32 // Stack needs to be 16b aligned on calls 1023 .cfi_adjust_cfa_offset 32 1024 stp x0, x1, [sp] 1025 .cfi_rel_offset x0, 0 1026 .cfi_rel_offset x1, 8 1027 stp xSELF, xLR, [sp, #16] 1028 .cfi_rel_offset x18, 16 1029 .cfi_rel_offset x30, 24 1030 1031 // Call runtime code 1032 bl artIsAssignableFromCode 1033 1034 // Check for exception 1035 cbz x0, .Lthrow_class_cast_exception 1036 1037 // Restore and return 1038 ldp x0, x1, [sp] 1039 .cfi_restore x0 1040 .cfi_restore x1 1041 ldp xSELF, xLR, [sp, #16] 1042 .cfi_restore x18 1043 .cfi_restore x30 1044 add sp, sp, #32 1045 .cfi_adjust_cfa_offset -32 1046 ret 1047 1048.Lthrow_class_cast_exception: 1049 // Restore 1050 ldp x0, x1, [sp] 1051 .cfi_restore x0 1052 .cfi_restore x1 1053 ldp xSELF, xLR, [sp, #16] 1054 .cfi_restore x18 1055 .cfi_restore x30 1056 add sp, sp, #32 1057 .cfi_adjust_cfa_offset -32 1058 1059 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 1060 mov x2, xSELF // pass Thread::Current 1061 mov x3, sp // pass SP 1062 b artThrowClassCastException // (Class*, Class*, Thread*, SP) 1063 brk 0 // We should not return here... 1064END art_quick_check_cast 1065 1066 /* 1067 * Entry from managed code for array put operations of objects where the value being stored 1068 * needs to be checked for compatibility. 1069 * x0 = array, x1 = index, x2 = value 1070 * 1071 * Currently all values should fit into w0/w1/w2, and w1 always will as indices are 32b. We 1072 * assume, though, that the upper 32b are zeroed out. At least for x1/w1 we can do better by 1073 * using index-zero-extension in load/stores. 1074 * 1075 * Temporaries: x3, x4 1076 * TODO: x4 OK? ip seems wrong here. 1077 */ 1078ENTRY art_quick_aput_obj_with_null_and_bound_check 1079 tst x0, x0 1080 bne art_quick_aput_obj_with_bound_check 1081 b art_quick_throw_null_pointer_exception 1082END art_quick_aput_obj_with_null_and_bound_check 1083 1084ENTRY art_quick_aput_obj_with_bound_check 1085 ldr w3, [x0, #ARRAY_LENGTH_OFFSET] 1086 cmp w3, w1 1087 bhi art_quick_aput_obj 1088 mov x0, x1 1089 mov x1, x3 1090 b art_quick_throw_array_bounds 1091END art_quick_aput_obj_with_bound_check 1092 1093ENTRY art_quick_aput_obj 1094 cbz x2, .Ldo_aput_null 1095 ldr w3, [x0, #CLASS_OFFSET] // Heap reference = 32b 1096 // This also zero-extends to x3 1097 ldr w4, [x2, #CLASS_OFFSET] // Heap reference = 32b 1098 // This also zero-extends to x4 1099 ldr w3, [x3, #CLASS_COMPONENT_TYPE_OFFSET] // Heap reference = 32b 1100 // This also zero-extends to x3 1101 cmp w3, w4 // value's type == array's component type - trivial assignability 1102 bne .Lcheck_assignability 1103.Ldo_aput: 1104 add x3, x0, #OBJECT_ARRAY_DATA_OFFSET 1105 // "Compress" = do nothing 1106 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1107 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1108 lsr x0, x0, #7 1109 strb w3, [x3, x0] 1110 ret 1111.Ldo_aput_null: 1112 add x3, x0, #OBJECT_ARRAY_DATA_OFFSET 1113 // "Compress" = do nothing 1114 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1115 ret 1116.Lcheck_assignability: 1117 // Store arguments and link register 1118 sub sp, sp, #48 // Stack needs to be 16b aligned on calls 1119 .cfi_adjust_cfa_offset 48 1120 stp x0, x1, [sp] 1121 .cfi_rel_offset x0, 0 1122 .cfi_rel_offset x1, 8 1123 stp x2, xSELF, [sp, #16] 1124 .cfi_rel_offset x2, 16 1125 .cfi_rel_offset x18, 24 1126 str xLR, [sp, #32] 1127 .cfi_rel_offset x30, 32 1128 1129 // Call runtime code 1130 mov x0, x3 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1131 mov x1, x4 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1132 bl artIsAssignableFromCode 1133 1134 // Check for exception 1135 cbz x0, .Lthrow_array_store_exception 1136 1137 // Restore 1138 ldp x0, x1, [sp] 1139 .cfi_restore x0 1140 .cfi_restore x1 1141 ldp x2, xSELF, [sp, #16] 1142 .cfi_restore x2 1143 .cfi_restore x18 1144 ldr xLR, [sp, #32] 1145 .cfi_restore x30 1146 add sp, sp, #48 1147 .cfi_adjust_cfa_offset -48 1148 1149 add x3, x0, #OBJECT_ARRAY_DATA_OFFSET 1150 // "Compress" = do nothing 1151 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1152 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1153 lsr x0, x0, #7 1154 strb w3, [x3, x0] 1155 ret 1156.Lthrow_array_store_exception: 1157 ldp x0, x1, [sp] 1158 .cfi_restore x0 1159 .cfi_restore x1 1160 ldp x2, xSELF, [sp, #16] 1161 .cfi_restore x2 1162 .cfi_restore x18 1163 ldr xLR, [sp, #32] 1164 .cfi_restore x30 1165 add sp, sp, #48 1166 .cfi_adjust_cfa_offset -48 1167 1168 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1169 mov x1, x2 // Pass value. 1170 mov x2, xSELF // Pass Thread::Current. 1171 mov x3, sp // Pass SP. 1172 b artThrowArrayStoreException // (Object*, Object*, Thread*, SP). 1173 brk 0 // Unreached. 1174END art_quick_aput_obj 1175 1176// Macro to facilitate adding new allocation entrypoints. 1177.macro TWO_ARG_DOWNCALL name, entrypoint, return 1178 .extern \entrypoint 1179ENTRY \name 1180 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1181 mov x2, xSELF // pass Thread::Current 1182 mov x3, sp // pass SP 1183 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP) 1184 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1185 \return 1186 DELIVER_PENDING_EXCEPTION 1187END \name 1188.endm 1189 1190// Macro to facilitate adding new array allocation entrypoints. 1191.macro THREE_ARG_DOWNCALL name, entrypoint, return 1192 .extern \entrypoint 1193ENTRY \name 1194 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1195 mov x3, xSELF // pass Thread::Current 1196 mov x4, sp // pass SP 1197 bl \entrypoint 1198 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1199 \return 1200 DELIVER_PENDING_EXCEPTION 1201END \name 1202.endm 1203 1204// Macros taking opportunity of code similarities for downcalls with referrer. 1205.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return 1206 .extern \entrypoint 1207ENTRY \name 1208 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1209 ldr w1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1210 mov x2, xSELF // pass Thread::Current 1211 mov x3, sp // pass SP 1212 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP) 1213 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1214 \return 1215END \name 1216.endm 1217 1218.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return 1219 .extern \entrypoint 1220ENTRY \name 1221 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1222 ldr w2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1223 mov x3, xSELF // pass Thread::Current 1224 mov x4, sp // pass SP 1225 bl \entrypoint 1226 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1227 \return 1228END \name 1229.endm 1230 1231.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return 1232 .extern \entrypoint 1233ENTRY \name 1234 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1235 ldr w3, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1236 mov x4, xSELF // pass Thread::Current 1237 mov x5, sp // pass SP 1238 bl \entrypoint 1239 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1240 \return 1241END \name 1242.endm 1243 1244 /* 1245 * Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on 1246 * failure. 1247 */ 1248TWO_ARG_REF_DOWNCALL art_quick_handle_fill_data, artHandleFillArrayDataFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1249 1250 /* 1251 * Entry from managed code when uninitialized static storage, this stub will run the class 1252 * initializer and deliver the exception on error. On success the static storage base is 1253 * returned. 1254 */ 1255TWO_ARG_DOWNCALL art_quick_initialize_static_storage, artInitializeStaticStorageFromCode, RETURN_IF_RESULT_IS_NON_ZERO 1256 1257TWO_ARG_DOWNCALL art_quick_initialize_type, artInitializeTypeFromCode, RETURN_IF_RESULT_IS_NON_ZERO 1258TWO_ARG_DOWNCALL art_quick_initialize_type_and_verify_access, artInitializeTypeAndVerifyAccessFromCode, RETURN_IF_RESULT_IS_NON_ZERO 1259 1260ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1261ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1262ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1263ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1264ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1265ONE_ARG_REF_DOWNCALL art_quick_get64_static, artGet64StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1266ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1267 1268TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1269TWO_ARG_REF_DOWNCALL art_quick_get_byte_instance, artGetByteInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1270TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1271TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1272TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1273TWO_ARG_REF_DOWNCALL art_quick_get64_instance, artGet64InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1274TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1275 1276TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1277TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1278TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1279TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1280 1281THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1282THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1283THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1284THREE_ARG_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1285THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1286 1287// This is separated out as the argument order is different. 1288 .extern artSet64StaticFromCode 1289ENTRY art_quick_set64_static 1290 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1291 mov x3, x1 // Store value 1292 ldr w1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1293 mov x2, x3 // Put value param 1294 mov x3, xSELF // pass Thread::Current 1295 mov x4, sp // pass SP 1296 bl artSet64StaticFromCode 1297 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1298 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1299END art_quick_set64_static 1300 1301 /* 1302 * Entry from managed code to resolve a string, this stub will allocate a String and deliver an 1303 * exception on error. On success the String is returned. x0 holds the referring method, 1304 * w1 holds the string index. The fast path check for hit in strings cache has already been 1305 * performed. 1306 */ 1307TWO_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO 1308 1309// Generate the allocation entrypoints for each allocator. 1310GENERATE_ALL_ALLOC_ENTRYPOINTS 1311 1312 /* 1313 * Called by managed code when the value in wSUSPEND has been decremented to 0. 1314 */ 1315 .extern artTestSuspendFromCode 1316ENTRY art_quick_test_suspend 1317 ldrh w0, [xSELF, #THREAD_FLAGS_OFFSET] // get xSELF->state_and_flags.as_struct.flags 1318 mov wSUSPEND, #SUSPEND_CHECK_INTERVAL // reset wSUSPEND to SUSPEND_CHECK_INTERVAL 1319 cbnz w0, .Lneed_suspend // check flags == 0 1320 ret // return if flags == 0 1321.Lneed_suspend: 1322 mov x0, xSELF 1323 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1324 mov x1, sp 1325 bl artTestSuspendFromCode // (Thread*, SP) 1326 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1327END art_quick_test_suspend 1328 1329ENTRY art_quick_implicit_suspend 1330 mov x0, xSELF 1331 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1332 mov x1, sp 1333 bl artTestSuspendFromCode // (Thread*, SP) 1334 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1335END art_quick_implicit_suspend 1336 1337 /* 1338 * Called by managed code that is attempting to call a method on a proxy class. On entry 1339 * x0 holds the proxy method and x1 holds the receiver; The frame size of the invoked proxy 1340 * method agrees with a ref and args callee save frame. 1341 */ 1342 .extern artQuickProxyInvokeHandler 1343ENTRY art_quick_proxy_invoke_handler 1344 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 1345 str x0, [sp, #0] // place proxy method at bottom of frame 1346 mov x2, xSELF // pass Thread::Current 1347 mov x3, sp // pass SP 1348 bl artQuickProxyInvokeHandler // (Method* proxy method, receiver, Thread*, SP) 1349 // Use xETR as xSELF might be scratched by native function above. 1350 ldr x2, [xETR, THREAD_EXCEPTION_OFFSET] 1351 cbnz x2, .Lexception_in_proxy // success if no exception is pending 1352 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME // Restore frame 1353 fmov d0, x0 // Store result in d0 in case it was float or double 1354 ret // return on success 1355.Lexception_in_proxy: 1356 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1357 DELIVER_PENDING_EXCEPTION 1358END art_quick_proxy_invoke_handler 1359 1360 /* 1361 * Called to resolve an imt conflict. xIP1 is a hidden argument that holds the target method's 1362 * dex method index. 1363 */ 1364ENTRY art_quick_imt_conflict_trampoline 1365 ldr w0, [sp, #0] // load caller Method* 1366 ldr w0, [x0, #METHOD_DEX_CACHE_METHODS_OFFSET] // load dex_cache_resolved_methods 1367 add x0, x0, #OBJECT_ARRAY_DATA_OFFSET // get starting address of data 1368 ldr w0, [x0, xIP1, lsl 2] // load the target method 1369 b art_quick_invoke_interface_trampoline 1370END art_quick_imt_conflict_trampoline 1371 1372ENTRY art_quick_resolution_trampoline 1373 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 1374 mov x2, xSELF 1375 mov x3, sp 1376 bl artQuickResolutionTrampoline // (called, receiver, Thread*, SP) 1377 cbz x0, 1f 1378 mov xIP0, x0 // Remember returned code pointer in xIP0. 1379 ldr w0, [sp, #0] // artQuickResolutionTrampoline puts called method in *SP. 1380 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1381 br xIP0 13821: 1383 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1384 DELIVER_PENDING_EXCEPTION 1385END art_quick_resolution_trampoline 1386 1387/* 1388 * Generic JNI frame layout: 1389 * 1390 * #-------------------# 1391 * | | 1392 * | caller method... | 1393 * #-------------------# <--- SP on entry 1394 * | Return X30/LR | 1395 * | X29/FP | callee save 1396 * | X28 | callee save 1397 * | X27 | callee save 1398 * | X26 | callee save 1399 * | X25 | callee save 1400 * | X24 | callee save 1401 * | X23 | callee save 1402 * | X22 | callee save 1403 * | X21 | callee save 1404 * | X20 | callee save 1405 * | X7 | arg7 1406 * | X6 | arg6 1407 * | X5 | arg5 1408 * | X4 | arg4 1409 * | X3 | arg3 1410 * | X2 | arg2 1411 * | X1 | arg1 1412 * | D7 | float arg 8 1413 * | D6 | float arg 7 1414 * | D5 | float arg 6 1415 * | D4 | float arg 5 1416 * | D3 | float arg 4 1417 * | D2 | float arg 3 1418 * | D1 | float arg 2 1419 * | D0 | float arg 1 1420 * | Method* | <- X0 1421 * #-------------------# 1422 * | local ref cookie | // 4B 1423 * | handle scope size | // 4B 1424 * #-------------------# 1425 * | JNI Call Stack | 1426 * #-------------------# <--- SP on native call 1427 * | | 1428 * | Stack for Regs | The trampoline assembly will pop these values 1429 * | | into registers for native call 1430 * #-------------------# 1431 * | Native code ptr | 1432 * #-------------------# 1433 * | Free scratch | 1434 * #-------------------# 1435 * | Ptr to (1) | <--- SP 1436 * #-------------------# 1437 */ 1438 /* 1439 * Called to do a generic JNI down-call 1440 */ 1441ENTRY_NO_HIDE art_quick_generic_jni_trampoline 1442 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 1443 str x0, [sp, #0] // Store native ArtMethod* to bottom of stack. 1444 1445 // Save SP , so we can have static CFI info. 1446 mov x28, sp 1447 .cfi_def_cfa_register x28 1448 1449 // This looks the same, but is different: this will be updated to point to the bottom 1450 // of the frame when the handle scope is inserted. 1451 mov xFP, sp 1452 1453 mov xIP0, #5120 1454 sub sp, sp, xIP0 1455 1456 // prepare for artQuickGenericJniTrampoline call 1457 // (Thread*, SP) 1458 // x0 x1 <= C calling convention 1459 // xSELF xFP <= where they are 1460 1461 mov x0, xSELF // Thread* 1462 mov x1, xFP 1463 bl artQuickGenericJniTrampoline // (Thread*, sp) 1464 1465 // The C call will have registered the complete save-frame on success. 1466 // The result of the call is: 1467 // x0: pointer to native code, 0 on error. 1468 // x1: pointer to the bottom of the used area of the alloca, can restore stack till there. 1469 1470 // Check for error = 0. 1471 cbz x0, .Lentry_error 1472 1473 // Release part of the alloca. 1474 mov sp, x1 1475 1476 // Save the code pointer 1477 mov xIP0, x0 1478 1479 // Load parameters from frame into registers. 1480 // TODO Check with artQuickGenericJniTrampoline. 1481 // Also, check again APPCS64 - the stack arguments are interleaved. 1482 ldp x0, x1, [sp] 1483 ldp x2, x3, [sp, #16] 1484 ldp x4, x5, [sp, #32] 1485 ldp x6, x7, [sp, #48] 1486 1487 ldp d0, d1, [sp, #64] 1488 ldp d2, d3, [sp, #80] 1489 ldp d4, d5, [sp, #96] 1490 ldp d6, d7, [sp, #112] 1491 1492 add sp, sp, #128 1493 1494 blr xIP0 // native call. 1495 1496 // result sign extension is handled in C code 1497 // prepare for artQuickGenericJniEndTrampoline call 1498 // (Thread*, result, result_f) 1499 // x0 x1 x2 <= C calling convention 1500 mov x1, x0 // Result (from saved) 1501 mov x0, xETR // Thread register, original xSELF might be scratched by native code. 1502 fmov x2, d0 // d0 will contain floating point result, but needs to go into x2 1503 1504 bl artQuickGenericJniEndTrampoline 1505 1506 // Tear down the alloca. 1507 mov sp, x28 1508 .cfi_def_cfa_register sp 1509 1510 // Pending exceptions possible. 1511 // Use xETR as xSELF might be scratched by native code 1512 ldr x1, [xETR, THREAD_EXCEPTION_OFFSET] 1513 cbnz x1, .Lexception_in_native 1514 1515 // Tear down the callee-save frame. 1516 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1517 1518 // store into fpr, for when it's a fpr return... 1519 fmov d0, x0 1520 ret 1521 1522.Lentry_error: 1523 mov sp, x28 1524 .cfi_def_cfa_register sp 1525.Lexception_in_native: 1526 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1527 DELIVER_PENDING_EXCEPTION 1528 1529END art_quick_generic_jni_trampoline 1530 1531/* 1532 * Called to bridge from the quick to interpreter ABI. On entry the arguments match those 1533 * of a quick call: 1534 * x0 = method being called/to bridge to. 1535 * x1..x7, d0..d7 = arguments to that method. 1536 */ 1537ENTRY_NO_HIDE art_quick_to_interpreter_bridge 1538 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME // Set up frame and save arguments. 1539 1540 // x0 will contain mirror::ArtMethod* method. 1541 mov x1, xSELF // How to get Thread::Current() ??? 1542 mov x2, sp 1543 1544 // uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 1545 // mirror::ArtMethod** sp) 1546 bl artQuickToInterpreterBridge 1547 1548 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME // TODO: no need to restore arguments in this case. 1549 1550 fmov d0, x0 1551 1552 RETURN_OR_DELIVER_PENDING_EXCEPTION 1553END art_quick_to_interpreter_bridge 1554 1555 1556// 1557// Instrumentation-related stubs 1558// 1559 .extern artInstrumentationMethodEntryFromCode 1560ENTRY art_quick_instrumentation_entry 1561 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 1562 1563 mov x20, x0 // Preserve method reference in a callee-save. 1564 1565 mov x2, xSELF 1566 mov x3, sp 1567 mov x4, xLR 1568 bl artInstrumentationMethodEntryFromCode // (Method*, Object*, Thread*, SP, LR) 1569 1570 mov xIP0, x0 // x0 = result of call. 1571 mov x0, x20 // Reload method reference. 1572 1573 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME // Note: will restore xSELF 1574 adr xLR, art_quick_instrumentation_exit 1575 br xIP0 // Tail-call method with lr set to art_quick_instrumentation_exit. 1576END art_quick_instrumentation_entry 1577 1578 .extern artInstrumentationMethodExitFromCode 1579ENTRY art_quick_instrumentation_exit 1580 mov xLR, #0 // Clobber LR for later checks. 1581 1582 SETUP_REF_ONLY_CALLEE_SAVE_FRAME 1583 1584 // We need to save x0 and d0. We could use a callee-save from SETUP_REF_ONLY, but then 1585 // we would need to fully restore it. As there are a lot of callee-save registers, it seems 1586 // easier to have an extra small stack area. 1587 1588 str x0, [sp, #-16]! // Save integer result. 1589 .cfi_adjust_cfa_offset 16 1590 str d0, [sp, #8] // Save floating-point result. 1591 1592 add x1, sp, #16 // Pass SP. 1593 mov x2, x0 // Pass integer result. 1594 fmov x3, d0 // Pass floating-point result. 1595 mov x0, xSELF // Pass Thread. 1596 bl artInstrumentationMethodExitFromCode // (Thread*, SP, gpr_res, fpr_res) 1597 1598 mov xIP0, x0 // Return address from instrumentation call. 1599 mov xLR, x1 // r1 is holding link register if we're to bounce to deoptimize 1600 1601 ldr d0, [sp, #8] // Restore floating-point result. 1602 ldr x0, [sp], 16 // Restore integer result, and drop stack area. 1603 .cfi_adjust_cfa_offset 16 1604 1605 POP_REF_ONLY_CALLEE_SAVE_FRAME 1606 1607 br xIP0 // Tail-call out. 1608END art_quick_instrumentation_exit 1609 1610 /* 1611 * Instrumentation has requested that we deoptimize into the interpreter. The deoptimization 1612 * will long jump to the upcall with a special exception of -1. 1613 */ 1614 .extern artDeoptimize 1615ENTRY art_quick_deoptimize 1616 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1617 mov x0, xSELF // Pass thread. 1618 mov x1, sp // Pass SP. 1619 bl artDeoptimize // artDeoptimize(Thread*, SP) 1620 brk 0 1621END art_quick_deoptimize 1622 1623 1624 /* 1625 * String's indexOf. 1626 * 1627 * TODO: Not very optimized. 1628 * On entry: 1629 * x0: string object (known non-null) 1630 * w1: char to match (known <= 0xFFFF) 1631 * w2: Starting offset in string data 1632 */ 1633ENTRY art_quick_indexof 1634 ldr w3, [x0, #STRING_COUNT_OFFSET] 1635 ldr w4, [x0, #STRING_OFFSET_OFFSET] 1636 ldr w0, [x0, #STRING_VALUE_OFFSET] // x0 ? 1637 1638 /* Clamp start to [0..count] */ 1639 cmp w2, #0 1640 csel w2, wzr, w2, lt 1641 cmp w2, w3 1642 csel w2, w3, w2, gt 1643 1644 /* Build a pointer to the start of the string data */ 1645 add x0, x0, #STRING_DATA_OFFSET 1646 add x0, x0, x4, lsl #1 1647 1648 /* Save a copy to compute result */ 1649 mov x5, x0 1650 1651 /* Build pointer to start of data to compare and pre-bias */ 1652 add x0, x0, x2, lsl #1 1653 sub x0, x0, #2 1654 1655 /* Compute iteration count */ 1656 sub w2, w3, w2 1657 1658 /* 1659 * At this point we have: 1660 * x0: start of the data to test 1661 * w1: char to compare 1662 * w2: iteration count 1663 * x5: original start of string data 1664 */ 1665 1666 subs w2, w2, #4 1667 b.lt .Lindexof_remainder 1668 1669.Lindexof_loop4: 1670 ldrh w6, [x0, #2]! 1671 ldrh w7, [x0, #2]! 1672 ldrh wIP0, [x0, #2]! 1673 ldrh wIP1, [x0, #2]! 1674 cmp w6, w1 1675 b.eq .Lmatch_0 1676 cmp w7, w1 1677 b.eq .Lmatch_1 1678 cmp wIP0, w1 1679 b.eq .Lmatch_2 1680 cmp wIP1, w1 1681 b.eq .Lmatch_3 1682 subs w2, w2, #4 1683 b.ge .Lindexof_loop4 1684 1685.Lindexof_remainder: 1686 adds w2, w2, #4 1687 b.eq .Lindexof_nomatch 1688 1689.Lindexof_loop1: 1690 ldrh w6, [x0, #2]! 1691 cmp w6, w1 1692 b.eq .Lmatch_3 1693 subs w2, w2, #1 1694 b.ne .Lindexof_loop1 1695 1696.Lindexof_nomatch: 1697 mov x0, #-1 1698 ret 1699 1700.Lmatch_0: 1701 sub x0, x0, #6 1702 sub x0, x0, x5 1703 asr x0, x0, #1 1704 ret 1705.Lmatch_1: 1706 sub x0, x0, #4 1707 sub x0, x0, x5 1708 asr x0, x0, #1 1709 ret 1710.Lmatch_2: 1711 sub x0, x0, #2 1712 sub x0, x0, x5 1713 asr x0, x0, #1 1714 ret 1715.Lmatch_3: 1716 sub x0, x0, x5 1717 asr x0, x0, #1 1718 ret 1719END art_quick_indexof 1720 1721 /* 1722 * String's compareTo. 1723 * 1724 * TODO: Not very optimized. 1725 * 1726 * On entry: 1727 * x0: this object pointer 1728 * x1: comp object pointer 1729 * 1730 */ 1731 .extern __memcmp16 1732ENTRY art_quick_string_compareto 1733 mov x2, x0 // x0 is return, use x2 for first input. 1734 sub x0, x2, x1 // Same string object? 1735 cbnz x0,1f 1736 ret 17371: // Different string objects. 1738 1739 ldr w6, [x2, #STRING_OFFSET_OFFSET] 1740 ldr w5, [x1, #STRING_OFFSET_OFFSET] 1741 ldr w4, [x2, #STRING_COUNT_OFFSET] 1742 ldr w3, [x1, #STRING_COUNT_OFFSET] 1743 ldr w2, [x2, #STRING_VALUE_OFFSET] 1744 ldr w1, [x1, #STRING_VALUE_OFFSET] 1745 1746 /* 1747 * Now: CharArray* Offset Count 1748 * first arg x2 w6 w4 1749 * second arg x1 w5 w3 1750 */ 1751 1752 // x0 := str1.length(w4) - str2.length(w3). ldr zero-extended w3/w4 into x3/x4. 1753 subs x0, x4, x3 1754 // Min(count1, count2) into w3. 1755 csel x3, x3, x4, ge 1756 1757 // Build pointer into string data. 1758 1759 // Add offset in array (substr etc.) (sign extend and << 1). 1760 add x2, x2, w6, sxtw #1 1761 add x1, x1, w5, sxtw #1 1762 1763 // Add offset in CharArray to array. 1764 add x2, x2, #STRING_DATA_OFFSET 1765 add x1, x1, #STRING_DATA_OFFSET 1766 1767 // TODO: Tune this value. 1768 // Check for long string, do memcmp16 for them. 1769 cmp w3, #28 // Constant from arm32. 1770 bgt .Ldo_memcmp16 1771 1772 /* 1773 * Now: 1774 * x2: *first string data 1775 * x1: *second string data 1776 * w3: iteration count 1777 * x0: return value if comparison equal 1778 * x4, x5, x6, x7: free 1779 */ 1780 1781 // Do a simple unrolled loop. 1782.Lloop: 1783 // At least two more elements? 1784 subs w3, w3, #2 1785 b.lt .Lremainder_or_done 1786 1787 ldrh w4, [x2], #2 1788 ldrh w5, [x1], #2 1789 1790 ldrh w6, [x2], #2 1791 ldrh w7, [x1], #2 1792 1793 subs w4, w4, w5 1794 b.ne .Lw4_result 1795 1796 subs w6, w6, w7 1797 b.ne .Lw6_result 1798 1799 b .Lloop 1800 1801.Lremainder_or_done: 1802 adds w3, w3, #1 1803 b.eq .Lremainder 1804 ret 1805 1806.Lremainder: 1807 ldrh w4, [x2], #2 1808 ldrh w5, [x1], #2 1809 subs w4, w4, w5 1810 b.ne .Lw4_result 1811 ret 1812 1813// Result is in w4 1814.Lw4_result: 1815 sxtw x0, w4 1816 ret 1817 1818// Result is in w6 1819.Lw6_result: 1820 sxtw x0, w6 1821 ret 1822 1823.Ldo_memcmp16: 1824 mov x14, x0 // Save x0 and LR. __memcmp16 does not use these temps. 1825 mov x15, xLR // TODO: Codify and check that? 1826 1827 mov x0, x2 1828 uxtw x2, w3 1829 bl __memcmp16 1830 1831 mov xLR, x15 // Restore LR. 1832 1833 cmp x0, #0 // Check the memcmp difference. 1834 csel x0, x0, x14, ne // x0 := x0 != 0 ? x14(prev x0=length diff) : x1. 1835 ret 1836END art_quick_string_compareto 1837 1838// Macro to facilitate adding new entrypoints which call to native function directly. 1839// Currently, xSELF is the only thing we need to take care of between managed code and AAPCS. 1840// But we might introduce more differences. 1841.macro NATIVE_DOWNCALL name, entrypoint 1842 .extern \entrypoint 1843ENTRY \name 1844 stp xSELF, xLR, [sp, #-16]! 1845 bl \entrypoint 1846 ldp xSELF, xLR, [sp], #16 1847 ret 1848END \name 1849.endm 1850 1851NATIVE_DOWNCALL art_quick_fmod fmod 1852NATIVE_DOWNCALL art_quick_fmodf fmodf 1853NATIVE_DOWNCALL art_quick_memcpy memcpy 1854NATIVE_DOWNCALL art_quick_assignable_from_code artIsAssignableFromCode 1855