quick_entrypoints_arm64.S revision 169489b4f4be8c5dd880ba6f152948324d22ff79
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 x9, :got:_ZN3art7Runtime9instance_E 28 ldr x9, [x9, #:got_lo12:_ZN3art7Runtime9instance_E] 29 30 // Our registers aren't intermixed - just spill in order. 31 ldr x9,[x9] // x9 = & (art::Runtime * art::Runtime.instance_) . 32 33 // x9 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 34 ldr x9, [x9, RUNTIME_SAVE_ALL_CALLEE_SAVE_FRAME_OFFSET ] 35 36 sub sp, sp, #368 37 .cfi_adjust_cfa_offset 368 38 39 // Ugly compile-time check, but we only have the preprocessor. 40#if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVE != 368) 41#error "SAVE_ALL_CALLEE_SAVE_FRAME(ARM64) size not as expected." 42#endif 43 44 // FP args 45 stp d0, d1, [sp, #8] 46 stp d2, d3, [sp, #24] 47 stp d4, d5, [sp, #40] 48 stp d6, d7, [sp, #56] 49 50 // FP callee-saves 51 stp d8, d9, [sp, #72] 52 stp d10, d11, [sp, #88] 53 stp d12, d13, [sp, #104] 54 stp d14, d15, [sp, #120] 55 56 stp d16, d17, [sp, #136] 57 stp d18, d19, [sp, #152] 58 stp d20, d21, [sp, #168] 59 stp d22, d23, [sp, #184] 60 stp d24, d25, [sp, #200] 61 stp d26, d27, [sp, #216] 62 stp d28, d29, [sp, #232] 63 stp d30, d31, [sp, #248] 64 65 66 // Callee saved. 67 stp xSELF, x19, [sp, #264] 68 .cfi_rel_offset x18, 264 69 .cfi_rel_offset x19, 272 70 71 stp x20, x21, [sp, #280] 72 .cfi_rel_offset x20, 280 73 .cfi_rel_offset x21, 288 74 75 stp x22, x23, [sp, #296] 76 .cfi_rel_offset x22, 296 77 .cfi_rel_offset x23, 304 78 79 stp x24, x25, [sp, #312] 80 .cfi_rel_offset x24, 312 81 .cfi_rel_offset x25, 320 82 83 stp x26, x27, [sp, #328] 84 .cfi_rel_offset x26, 328 85 .cfi_rel_offset x27, 336 86 87 stp x28, xFP, [sp, #344] // Save FP. 88 .cfi_rel_offset x28, 344 89 .cfi_rel_offset x29, 352 90 91 str xLR, [sp, #360] 92 .cfi_rel_offset x30, 360 93 94 // Loads appropriate callee-save-method 95 str x9, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 96 97.endm 98 99 /* 100 * Macro that sets up the callee save frame to conform with 101 * Runtime::CreateCalleeSaveMethod(kRefsOnly). 102 */ 103// WIP. 104.macro SETUP_REF_ONLY_CALLEE_SAVE_FRAME 105 adrp x9, :got:_ZN3art7Runtime9instance_E 106 ldr x9, [x9, #:got_lo12:_ZN3art7Runtime9instance_E] 107 108 // Our registers aren't intermixed - just spill in order. 109 ldr x9,[x9] // x9 = & (art::Runtime * art::Runtime.instance_) . 110 111 // x9 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 112 ldr x9, [x9, RUNTIME_REFS_ONLY_CALLEE_SAVE_FRAME_OFFSET ] 113 114 sub sp, sp, #176 115 .cfi_adjust_cfa_offset 176 116 117 // Ugly compile-time check, but we only have the preprocessor. 118#if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 176) 119#error "REFS_ONLY_CALLEE_SAVE_FRAME(ARM64) size not as expected." 120#endif 121 122 // FP callee-saves 123 stp d8, d9, [sp, #8] 124 stp d10, d11, [sp, #24] 125 stp d12, d13, [sp, #40] 126 stp d14, d15, [sp, #56] 127 128 // Callee saved. 129 stp xSELF, x19, [sp, #72] 130 .cfi_rel_offset x18, 72 131 .cfi_rel_offset x19, 80 132 133 stp x20, x21, [sp, #88] 134 .cfi_rel_offset x20, 88 135 .cfi_rel_offset x21, 96 136 137 stp x22, x23, [sp, #104] 138 .cfi_rel_offset x22, 104 139 .cfi_rel_offset x23, 112 140 141 stp x24, x25, [sp, #120] 142 .cfi_rel_offset x24, 120 143 .cfi_rel_offset x25, 128 144 145 stp x26, x27, [sp, #136] 146 .cfi_rel_offset x26, 136 147 .cfi_rel_offset x27, 144 148 149 stp x28, xFP, [sp, #152] // Save FP. 150 .cfi_rel_offset x28, 152 151 .cfi_rel_offset x29, 160 152 153 str xLR, [sp, #168] 154 .cfi_rel_offset x30, 168 155 156 // Loads appropriate callee-save-method 157 str x9, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 158.endm 159 160.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 161 // FP callee saves 162 ldp d8, d9, [sp, #8] 163 ldp d10, d11, [sp, #24] 164 ldp d12, d13, [sp, #40] 165 ldp d14, d15, [sp, #56] 166 167 // Callee saved. 168 ldp xSELF, x19, [sp, #72] 169 .cfi_restore x18 170 .cfi_restore x19 171 172 ldp x20, x21, [sp, #88] 173 .cfi_restore x20 174 .cfi_restore x21 175 176 ldp x22, x23, [sp, #104] 177 .cfi_restore x22 178 .cfi_restore x23 179 180 ldp x24, x25, [sp, #120] 181 .cfi_restore x24 182 .cfi_restore x25 183 184 ldp x26, x27, [sp, #136] 185 .cfi_restore x26 186 .cfi_restore x27 187 188 ldp x28, xFP, [sp, #152] // Save FP. 189 .cfi_restore x28 190 .cfi_restore x29 191 192 ldr xLR, [sp, #168] 193 .cfi_restore x30 194 195 add sp, sp, #176 196 .cfi_adjust_cfa_offset -176 197.endm 198 199.macro POP_REF_ONLY_CALLEE_SAVE_FRAME 200 add sp, sp, #176 201 .cfi_adjust_cfa_offset -176 202.endm 203 204.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 205 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 206 ret 207.endm 208 209 210.macro SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 211 sub sp, sp, #304 212 .cfi_adjust_cfa_offset 304 213 214 // Ugly compile-time check, but we only have the preprocessor. 215#if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 304) 216#error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(ARM64) size not as expected." 217#endif 218 219 stp d0, d1, [sp, #16] 220 stp d2, d3, [sp, #32] 221 stp d4, d5, [sp, #48] 222 stp d6, d7, [sp, #64] 223 stp d8, d9, [sp, #80] 224 stp d10, d11, [sp, #96] 225 stp d12, d13, [sp, #112] 226 stp d14, d15, [sp, #128] 227 228 stp x1, x2, [sp, #144] 229 .cfi_rel_offset x1, 144 230 .cfi_rel_offset x2, 152 231 232 stp x3, x4, [sp, #160] 233 .cfi_rel_offset x3, 160 234 .cfi_rel_offset x4, 168 235 236 stp x5, x6, [sp, #176] 237 .cfi_rel_offset x5, 176 238 .cfi_rel_offset x6, 184 239 240 stp x7, xSELF, [sp, #192] 241 .cfi_rel_offset x7, 192 242 .cfi_rel_offset x18, 200 243 244 stp x19, x20, [sp, #208] 245 .cfi_rel_offset x19, 208 246 .cfi_rel_offset x20, 216 247 248 stp x21, x22, [sp, #224] 249 .cfi_rel_offset x21, 224 250 .cfi_rel_offset x22, 232 251 252 stp x23, x24, [sp, #240] 253 .cfi_rel_offset x23, 240 254 .cfi_rel_offset x24, 248 255 256 stp x25, x26, [sp, #256] 257 .cfi_rel_offset x25, 256 258 .cfi_rel_offset x26, 264 259 260 stp x27, x28, [sp, #272] 261 .cfi_rel_offset x27, 272 262 .cfi_rel_offset x28, 280 263 264 stp xFP, xLR, [sp, #288] 265 .cfi_rel_offset x29, 288 266 .cfi_rel_offset x30, 296 267.endm 268 269 /* 270 * Macro that sets up the callee save frame to conform with 271 * Runtime::CreateCalleeSaveMethod(kRefsAndArgs). 272 * 273 * TODO This is probably too conservative - saving FP & LR. 274 */ 275.macro SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 276 adrp x9, :got:_ZN3art7Runtime9instance_E 277 ldr x9, [x9, #:got_lo12:_ZN3art7Runtime9instance_E] 278 279 // Our registers aren't intermixed - just spill in order. 280 ldr x9,[x9] // x9 = & (art::Runtime * art::Runtime.instance_) . 281 282 // x9 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] . 283 ldr x9, [x9, RUNTIME_REF_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET ] 284 285 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 286 287 str x9, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs] 288.endm 289 290.macro RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 291 292 ldp d0, d1, [sp, #16] 293 ldp d2, d3, [sp, #32] 294 ldp d4, d5, [sp, #48] 295 ldp d6, d7, [sp, #64] 296 ldp d8, d9, [sp, #80] 297 ldp d10, d11, [sp, #96] 298 ldp d12, d13, [sp, #112] 299 ldp d14, d15, [sp, #128] 300 301 // args. 302 ldp x1, x2, [sp, #144] 303 .cfi_restore x1 304 .cfi_restore x2 305 306 ldp x3, x4, [sp, #160] 307 .cfi_restore x3 308 .cfi_restore x4 309 310 ldp x5, x6, [sp, #176] 311 .cfi_restore x5 312 .cfi_restore x6 313 314 ldp x7, xSELF, [sp, #192] 315 .cfi_restore x7 316 .cfi_restore x18 317 318 ldp x19, x20, [sp, #208] 319 .cfi_restore x19 320 .cfi_restore x20 321 322 ldp x21, x22, [sp, #224] 323 .cfi_restore x21 324 .cfi_restore x22 325 326 ldp x23, x24, [sp, #240] 327 .cfi_restore x23 328 .cfi_restore x24 329 330 ldp x25, x26, [sp, #256] 331 .cfi_restore x25 332 .cfi_restore x26 333 334 ldp x27, x28, [sp, #272] 335 .cfi_restore x27 336 .cfi_restore x28 337 338 ldp xFP, xLR, [sp, #288] 339 .cfi_restore x29 340 .cfi_restore x30 341 342 add sp, sp, #304 343 .cfi_adjust_cfa_offset -304 344.endm 345 346.macro RETURN_IF_RESULT_IS_ZERO 347 cbnz x0, 1f // result non-zero branch over 348 ret // return 3491: 350.endm 351 352.macro RETURN_IF_RESULT_IS_NON_ZERO 353 cbz x0, 1f // result zero branch over 354 ret // return 3551: 356.endm 357 358 /* 359 * Macro that set calls through to artDeliverPendingExceptionFromCode, where the pending 360 * exception is Thread::Current()->exception_ 361 */ 362.macro DELIVER_PENDING_EXCEPTION 363 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 364 mov x0, xSELF 365 mov x1, sp 366 367 // Point of no return. 368 b artDeliverPendingExceptionFromCode // artDeliverPendingExceptionFromCode(Thread*, SP) 369 brk 0 // Unreached 370.endm 371 372.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_REG reg 373 ldr \reg, [xSELF, # THREAD_EXCEPTION_OFFSET] // Get exception field. 374 cbnz \reg, 1f 375 ret 3761: 377 DELIVER_PENDING_EXCEPTION 378.endm 379 380.macro RETURN_OR_DELIVER_PENDING_EXCEPTION 381 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG x9 382.endm 383 384// Same as above with x1. This is helpful in stubs that want to avoid clobbering another register. 385.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 386 RETURN_OR_DELIVER_PENDING_EXCEPTION_REG x1 387.endm 388 389.macro RETURN_IF_W0_IS_ZERO_OR_DELIVER 390 cbnz w0, 1f // result non-zero branch over 391 ret // return 3921: 393 DELIVER_PENDING_EXCEPTION 394.endm 395 396.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 397 .extern \cxx_name 398ENTRY \c_name 399 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 400 mov x0, xSELF // pass Thread::Current 401 mov x1, sp // pass SP 402 b \cxx_name // \cxx_name(Thread*, SP) 403END \c_name 404.endm 405 406.macro ONE_ARG_RUNTIME_EXCEPTION c_name, cxx_name 407 .extern \cxx_name 408ENTRY \c_name 409 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context. 410 mov x1, xSELF // pass Thread::Current. 411 mov x2, sp // pass SP. 412 b \cxx_name // \cxx_name(arg, Thread*, SP). 413 brk 0 414END \c_name 415.endm 416 417.macro TWO_ARG_RUNTIME_EXCEPTION c_name, cxx_name 418 .extern \cxx_name 419ENTRY \c_name 420 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 421 mov x2, xSELF // pass Thread::Current 422 mov x3, sp // pass SP 423 b \cxx_name // \cxx_name(arg1, arg2, Thread*, SP) 424 brk 0 425END \c_name 426.endm 427 428 /* 429 * Called by managed code, saves callee saves and then calls artThrowException 430 * that will place a mock Method* at the bottom of the stack. Arg1 holds the exception. 431 */ 432ONE_ARG_RUNTIME_EXCEPTION art_quick_deliver_exception, artDeliverExceptionFromCode 433 434 /* 435 * Called by managed code to create and deliver a NullPointerException. 436 */ 437NO_ARG_RUNTIME_EXCEPTION art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode 438 439 /* 440 * Called by managed code to create and deliver an ArithmeticException. 441 */ 442NO_ARG_RUNTIME_EXCEPTION art_quick_throw_div_zero, artThrowDivZeroFromCode 443 444 /* 445 * Called by managed code to create and deliver an ArrayIndexOutOfBoundsException. Arg1 holds 446 * index, arg2 holds limit. 447 */ 448TWO_ARG_RUNTIME_EXCEPTION art_quick_throw_array_bounds, artThrowArrayBoundsFromCode 449 450 /* 451 * Called by managed code to create and deliver a StackOverflowError. 452 */ 453NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode 454 455 /* 456 * Called by managed code to create and deliver a NoSuchMethodError. 457 */ 458ONE_ARG_RUNTIME_EXCEPTION art_quick_throw_no_such_method, artThrowNoSuchMethodFromCode 459 460 /* 461 * All generated callsites for interface invokes and invocation slow paths will load arguments 462 * as usual - except instead of loading arg0/x0 with the target Method*, arg0/x0 will contain 463 * the method_idx. This wrapper will save arg1-arg3, load the caller's Method*, align the 464 * stack and call the appropriate C helper. 465 * NOTE: "this" is first visible argument of the target, and so can be found in arg1/x1. 466 * 467 * The helper will attempt to locate the target and return a 128-bit result in x0/x1 consisting 468 * of the target Method* in x0 and method->code_ in x1. 469 * 470 * If unsuccessful, the helper will return NULL/????. There will be a pending exception in the 471 * thread and we branch to another stub to deliver it. 472 * 473 * On success this wrapper will restore arguments and *jump* to the target, leaving the lr 474 * pointing back to the original caller. 475 * 476 * Adapted from ARM32 code. 477 * 478 * Clobbers x12. 479 */ 480.macro INVOKE_TRAMPOLINE c_name, cxx_name 481 .extern \cxx_name 482ENTRY \c_name 483 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME // save callee saves in case allocation triggers GC 484 // Helper signature is always 485 // (method_idx, *this_object, *caller_method, *self, sp) 486 487 ldr w2, [sp, #FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE] // pass caller Method* 488 mov x3, xSELF // pass Thread::Current 489 mov x4, sp 490 bl \cxx_name // (method_idx, this, caller, Thread*, SP) 491 mov x12, x1 // save Method*->code_ 492 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 493 cbz x0, 1f // did we find the target? if not go to exception delivery 494 br x12 // tail call to target 4951: 496 DELIVER_PENDING_EXCEPTION 497END \c_name 498.endm 499 500INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline, artInvokeInterfaceTrampoline 501INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline_with_access_check, artInvokeInterfaceTrampolineWithAccessCheck 502 503INVOKE_TRAMPOLINE art_quick_invoke_static_trampoline_with_access_check, artInvokeStaticTrampolineWithAccessCheck 504INVOKE_TRAMPOLINE art_quick_invoke_direct_trampoline_with_access_check, artInvokeDirectTrampolineWithAccessCheck 505INVOKE_TRAMPOLINE art_quick_invoke_super_trampoline_with_access_check, artInvokeSuperTrampolineWithAccessCheck 506INVOKE_TRAMPOLINE art_quick_invoke_virtual_trampoline_with_access_check, artInvokeVirtualTrampolineWithAccessCheck 507 508 509.macro INVOKE_STUB_CREATE_FRAME 510 511SAVE_SIZE=6*8 // x4, x5, x19(wSUSPEND), SP, LR & FP saved. 512SAVE_SIZE_AND_METHOD=SAVE_SIZE+STACK_REFERENCE_SIZE 513 514 515 mov x9, sp // Save stack pointer. 516 .cfi_register sp,x9 517 518 add x10, x2, # SAVE_SIZE_AND_METHOD // calculate size of frame. 519 sub x10, sp, x10 // Calculate SP position - saves + ArtMethod* + args 520 and x10, x10, # ~0xf // Enforce 16 byte stack alignment. 521 mov sp, x10 // Set new SP. 522 523 sub x10, x9, #SAVE_SIZE // Calculate new FP (later). Done here as we must move SP 524 .cfi_def_cfa_register x10 // before this. 525 .cfi_adjust_cfa_offset SAVE_SIZE 526 527 stp x9, x19, [x10, #32] // Save old stack pointer and x19(wSUSPEND) 528 .cfi_rel_offset sp, 32 529 .cfi_rel_offset x19, 40 530 531 stp x4, x5, [x10, #16] // Save result and shorty addresses. 532 .cfi_rel_offset x4, 16 533 .cfi_rel_offset x5, 24 534 535 stp xFP, xLR, [x10] // Store LR & FP. 536 .cfi_rel_offset x29, 0 537 .cfi_rel_offset x30, 8 538 539 mov xFP, x10 // Use xFP now, as it's callee-saved. 540 .cfi_def_cfa_register x29 541 mov xSELF, x3 // Move thread pointer into SELF register. 542 mov wSUSPEND, #SUSPEND_CHECK_INTERVAL // reset wSUSPEND to suspend check interval 543 544 // Copy arguments into stack frame. 545 // Use simple copy routine for now. 546 // 4 bytes per slot. 547 // X1 - source address 548 // W2 - args length 549 // X9 - destination address. 550 // W10 - temporary 551 add x9, sp, #4 // Destination address is bottom of stack + NULL. 552 553 // Use \@ to differentiate between macro invocations. 554.LcopyParams\@: 555 cmp w2, #0 556 beq .LendCopyParams\@ 557 sub w2, w2, #4 // Need 65536 bytes of range. 558 ldr w10, [x1, x2] 559 str w10, [x9, x2] 560 561 b .LcopyParams\@ 562 563.LendCopyParams\@: 564 565 // Store NULL into StackReference<Method>* at bottom of frame. 566 str wzr, [sp] 567 568#if (STACK_REFERENCE_SIZE != 4) 569#error "STACK_REFERENCE_SIZE(ARM64) size not as expected." 570#endif 571.endm 572 573.macro INVOKE_STUB_CALL_AND_RETURN 574 575 // load method-> METHOD_QUICK_CODE_OFFSET 576 ldr x9, [x0 , #METHOD_QUICK_CODE_OFFSET] 577 // Branch to method. 578 blr x9 579 580 // Restore return value address and shorty address. 581 ldp x4,x5, [xFP, #16] 582 .cfi_restore x4 583 .cfi_restore x5 584 585 // Store result (w0/x0/s0/d0) appropriately, depending on resultType. 586 ldrb w10, [x5] 587 588 // Don't set anything for a void type. 589 cmp w10, #'V' 590 beq .Lexit_art_quick_invoke_stub\@ 591 592 cmp w10, #'D' 593 bne .Lreturn_is_float\@ 594 str d0, [x4] 595 b .Lexit_art_quick_invoke_stub\@ 596 597.Lreturn_is_float\@: 598 cmp w10, #'F' 599 bne .Lreturn_is_int\@ 600 str s0, [x4] 601 b .Lexit_art_quick_invoke_stub\@ 602 603 // Just store x0. Doesn't matter if it is 64 or 32 bits. 604.Lreturn_is_int\@: 605 str x0, [x4] 606 607.Lexit_art_quick_invoke_stub\@: 608 ldp x2, x19, [xFP, #32] // Restore stack pointer and x19. 609 .cfi_restore x19 610 mov sp, x2 611 .cfi_restore sp 612 613 ldp xFP, xLR, [xFP] // Restore old frame pointer and link register. 614 .cfi_restore x29 615 .cfi_restore x30 616 617 ret 618 619.endm 620 621 622/* 623 * extern"C" void art_quick_invoke_stub(ArtMethod *method, x0 624 * uint32_t *args, x1 625 * uint32_t argsize, w2 626 * Thread *self, x3 627 * JValue *result, x4 628 * char *shorty); x5 629 * +----------------------+ 630 * | | 631 * | C/C++ frame | 632 * | LR'' | 633 * | FP'' | <- SP' 634 * +----------------------+ 635 * +----------------------+ 636 * | SP' | 637 * | X5 | 638 * | X4 | Saved registers 639 * | LR' | 640 * | FP' | <- FP 641 * +----------------------+ 642 * | uint32_t out[n-1] | 643 * | : : | Outs 644 * | uint32_t out[0] | 645 * | StackRef<ArtMethod> | <- SP value=null 646 * +----------------------+ 647 * 648 * Outgoing registers: 649 * x0 - Method* 650 * x1-x7 - integer parameters. 651 * d0-d7 - Floating point parameters. 652 * xSELF = self 653 * wSUSPEND = suspend count 654 * SP = & of ArtMethod* 655 * x1 = "this" pointer. 656 * 657 */ 658ENTRY art_quick_invoke_stub 659 // Spill registers as per AACPS64 calling convention. 660 INVOKE_STUB_CREATE_FRAME 661 662 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 663 // Parse the passed shorty to determine which register to load. 664 // Load addresses for routines that load WXSD registers. 665 adr x11, .LstoreW2 666 adr x12, .LstoreX2 667 adr x13, .LstoreS0 668 adr x14, .LstoreD0 669 670 // Initialize routine offsets to 0 for integers and floats. 671 // x8 for integers, x15 for floating point. 672 mov x8, #0 673 mov x15, #0 674 675 add x10, x5, #1 // Load shorty address, plus one to skip return value. 676 ldr w1, [x9],#4 // Load "this" parameter, and increment arg pointer. 677 678 // Loop to fill registers. 679.LfillRegisters: 680 ldrb w17, [x10], #1 // Load next character in signature, and increment. 681 cbz w17, .LcallFunction // Exit at end of signature. Shorty 0 terminated. 682 683 cmp w17, #'F' // is this a float? 684 bne .LisDouble 685 686 cmp x15, # 8*12 // Skip this load if all registers full. 687 beq .Ladvance4 688 689 add x17, x13, x15 // Calculate subroutine to jump to. 690 br x17 691 692.LisDouble: 693 cmp w17, #'D' // is this a double? 694 bne .LisLong 695 696 cmp x15, # 8*12 // Skip this load if all registers full. 697 beq .Ladvance8 698 699 add x17, x14, x15 // Calculate subroutine to jump to. 700 br x17 701 702.LisLong: 703 cmp w17, #'J' // is this a long? 704 bne .LisOther 705 706 cmp x8, # 6*12 // Skip this load if all registers full. 707 beq .Ladvance8 708 709 add x17, x12, x8 // Calculate subroutine to jump to. 710 br x17 711 712.LisOther: // Everything else takes one vReg. 713 cmp x8, # 6*12 // Skip this load if all registers full. 714 beq .Ladvance4 715 716 add x17, x11, x8 // Calculate subroutine to jump to. 717 br x17 718 719.Ladvance4: 720 add x9, x9, #4 721 b .LfillRegisters 722 723.Ladvance8: 724 add x9, x9, #8 725 b .LfillRegisters 726 727// Macro for loading a parameter into a register. 728// counter - the register with offset into these tables 729// size - the size of the register - 4 or 8 bytes. 730// register - the name of the register to be loaded. 731.macro LOADREG counter size register return 732 ldr \register , [x9], #\size 733 add \counter, \counter, 12 734 b \return 735.endm 736 737// Store ints. 738.LstoreW2: 739 LOADREG x8 4 w2 .LfillRegisters 740 LOADREG x8 4 w3 .LfillRegisters 741 LOADREG x8 4 w4 .LfillRegisters 742 LOADREG x8 4 w5 .LfillRegisters 743 LOADREG x8 4 w6 .LfillRegisters 744 LOADREG x8 4 w7 .LfillRegisters 745 746// Store longs. 747.LstoreX2: 748 LOADREG x8 8 x2 .LfillRegisters 749 LOADREG x8 8 x3 .LfillRegisters 750 LOADREG x8 8 x4 .LfillRegisters 751 LOADREG x8 8 x5 .LfillRegisters 752 LOADREG x8 8 x6 .LfillRegisters 753 LOADREG x8 8 x7 .LfillRegisters 754 755// Store singles. 756.LstoreS0: 757 LOADREG x15 4 s0 .LfillRegisters 758 LOADREG x15 4 s1 .LfillRegisters 759 LOADREG x15 4 s2 .LfillRegisters 760 LOADREG x15 4 s3 .LfillRegisters 761 LOADREG x15 4 s4 .LfillRegisters 762 LOADREG x15 4 s5 .LfillRegisters 763 LOADREG x15 4 s6 .LfillRegisters 764 LOADREG x15 4 s7 .LfillRegisters 765 766// Store doubles. 767.LstoreD0: 768 LOADREG x15 8 d0 .LfillRegisters 769 LOADREG x15 8 d1 .LfillRegisters 770 LOADREG x15 8 d2 .LfillRegisters 771 LOADREG x15 8 d3 .LfillRegisters 772 LOADREG x15 8 d4 .LfillRegisters 773 LOADREG x15 8 d5 .LfillRegisters 774 LOADREG x15 8 d6 .LfillRegisters 775 LOADREG x15 8 d7 .LfillRegisters 776 777 778.LcallFunction: 779 780 INVOKE_STUB_CALL_AND_RETURN 781 782END art_quick_invoke_stub 783 784/* extern"C" 785 * void art_quick_invoke_static_stub(ArtMethod *method, x0 786 * uint32_t *args, x1 787 * uint32_t argsize, w2 788 * Thread *self, x3 789 * JValue *result, x4 790 * char *shorty); x5 791 */ 792ENTRY art_quick_invoke_static_stub 793 // Spill registers as per AACPS64 calling convention. 794 INVOKE_STUB_CREATE_FRAME 795 796 // Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters. 797 // Parse the passed shorty to determine which register to load. 798 // Load addresses for routines that load WXSD registers. 799 adr x11, .LstoreW1_2 800 adr x12, .LstoreX1_2 801 adr x13, .LstoreS0_2 802 adr x14, .LstoreD0_2 803 804 // Initialize routine offsets to 0 for integers and floats. 805 // x8 for integers, x15 for floating point. 806 mov x8, #0 807 mov x15, #0 808 809 add x10, x5, #1 // Load shorty address, plus one to skip return value. 810 811 // Loop to fill registers. 812.LfillRegisters2: 813 ldrb w17, [x10], #1 // Load next character in signature, and increment. 814 cbz w17, .LcallFunction2 // Exit at end of signature. Shorty 0 terminated. 815 816 cmp w17, #'F' // is this a float? 817 bne .LisDouble2 818 819 cmp x15, # 8*12 // Skip this load if all registers full. 820 beq .Ladvance4_2 821 822 add x17, x13, x15 // Calculate subroutine to jump to. 823 br x17 824 825.LisDouble2: 826 cmp w17, #'D' // is this a double? 827 bne .LisLong2 828 829 cmp x15, # 8*12 // Skip this load if all registers full. 830 beq .Ladvance8_2 831 832 add x17, x14, x15 // Calculate subroutine to jump to. 833 br x17 834 835.LisLong2: 836 cmp w17, #'J' // is this a long? 837 bne .LisOther2 838 839 cmp x8, # 7*12 // Skip this load if all registers full. 840 beq .Ladvance8_2 841 842 add x17, x12, x8 // Calculate subroutine to jump to. 843 br x17 844 845.LisOther2: // Everything else takes one vReg. 846 cmp x8, # 7*12 // Skip this load if all registers full. 847 beq .Ladvance4_2 848 849 add x17, x11, x8 // Calculate subroutine to jump to. 850 br x17 851 852.Ladvance4_2: 853 add x9, x9, #4 854 b .LfillRegisters2 855 856.Ladvance8_2: 857 add x9, x9, #8 858 b .LfillRegisters2 859 860// Store ints. 861.LstoreW1_2: 862 LOADREG x8 4 w1 .LfillRegisters2 863 LOADREG x8 4 w2 .LfillRegisters2 864 LOADREG x8 4 w3 .LfillRegisters2 865 LOADREG x8 4 w4 .LfillRegisters2 866 LOADREG x8 4 w5 .LfillRegisters2 867 LOADREG x8 4 w6 .LfillRegisters2 868 LOADREG x8 4 w7 .LfillRegisters2 869 870// Store longs. 871.LstoreX1_2: 872 LOADREG x8 8 x1 .LfillRegisters2 873 LOADREG x8 8 x2 .LfillRegisters2 874 LOADREG x8 8 x3 .LfillRegisters2 875 LOADREG x8 8 x4 .LfillRegisters2 876 LOADREG x8 8 x5 .LfillRegisters2 877 LOADREG x8 8 x6 .LfillRegisters2 878 LOADREG x8 8 x7 .LfillRegisters2 879 880// Store singles. 881.LstoreS0_2: 882 LOADREG x15 4 s0 .LfillRegisters2 883 LOADREG x15 4 s1 .LfillRegisters2 884 LOADREG x15 4 s2 .LfillRegisters2 885 LOADREG x15 4 s3 .LfillRegisters2 886 LOADREG x15 4 s4 .LfillRegisters2 887 LOADREG x15 4 s5 .LfillRegisters2 888 LOADREG x15 4 s6 .LfillRegisters2 889 LOADREG x15 4 s7 .LfillRegisters2 890 891// Store doubles. 892.LstoreD0_2: 893 LOADREG x15 8 d0 .LfillRegisters2 894 LOADREG x15 8 d1 .LfillRegisters2 895 LOADREG x15 8 d2 .LfillRegisters2 896 LOADREG x15 8 d3 .LfillRegisters2 897 LOADREG x15 8 d4 .LfillRegisters2 898 LOADREG x15 8 d5 .LfillRegisters2 899 LOADREG x15 8 d6 .LfillRegisters2 900 LOADREG x15 8 d7 .LfillRegisters2 901 902 903.LcallFunction2: 904 905 INVOKE_STUB_CALL_AND_RETURN 906 907END art_quick_invoke_static_stub 908 909 910 911 /* 912 * On entry x0 is uintptr_t* gprs_ and x1 is uint64_t* fprs_ 913 */ 914 915ENTRY art_quick_do_long_jump 916 // Load FPRs 917 ldp d0, d1, [x1], #16 918 ldp d2, d3, [x1], #16 919 ldp d4, d5, [x1], #16 920 ldp d6, d7, [x1], #16 921 ldp d8, d9, [x1], #16 922 ldp d10, d11, [x1], #16 923 ldp d12, d13, [x1], #16 924 ldp d14, d15, [x1], #16 925 ldp d16, d17, [x1], #16 926 ldp d18, d19, [x1], #16 927 ldp d20, d21, [x1], #16 928 ldp d22, d23, [x1], #16 929 ldp d24, d25, [x1], #16 930 ldp d26, d27, [x1], #16 931 ldp d28, d29, [x1], #16 932 ldp d30, d31, [x1] 933 934 // Load GPRs 935 // TODO: lots of those are smashed, could optimize. 936 add x0, x0, #30*8 937 ldp x30, x1, [x0], #-16 938 ldp x28, x29, [x0], #-16 939 ldp x26, x27, [x0], #-16 940 ldp x24, x25, [x0], #-16 941 ldp x22, x23, [x0], #-16 942 ldp x20, x21, [x0], #-16 943 ldp x18, x19, [x0], #-16 944 ldp x16, x17, [x0], #-16 945 ldp x14, x15, [x0], #-16 946 ldp x12, x13, [x0], #-16 947 ldp x10, x11, [x0], #-16 948 ldp x8, x9, [x0], #-16 949 ldp x6, x7, [x0], #-16 950 ldp x4, x5, [x0], #-16 951 ldp x2, x3, [x0], #-16 952 mov sp, x1 953 954 // TODO: Is it really OK to use LR for the target PC? 955 mov x0, #0 956 mov x1, #0 957 br xLR 958END art_quick_do_long_jump 959 960 /* 961 * Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on 962 * failure. 963 */ 964 .extern artHandleFillArrayDataFromCode 965ENTRY art_quick_handle_fill_data 966 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // Save callee saves in case exception allocation triggers GC. 967 mov x2, xSELF // Pass Thread::Current. 968 mov x3, sp // Pass SP. 969 bl artHandleFillArrayDataFromCode // (Array*, const DexFile::Payload*, Thread*, SP) 970 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 971 RETURN_IF_RESULT_IS_ZERO 972 DELIVER_PENDING_EXCEPTION 973END art_quick_handle_fill_data 974 975 /* 976 * Entry from managed code that calls artLockObjectFromCode, may block for GC. x0 holds the 977 * possibly null object to lock. 978 * 979 * Derived from arm32 code. 980 */ 981 .extern artLockObjectFromCode 982ENTRY art_quick_lock_object 983 cbz w0, .Lslow_lock 984 add x4, x0, #LOCK_WORD_OFFSET // exclusive load/store had no immediate anymore 985.Lretry_lock: 986 ldr w2, [xSELF, #THREAD_ID_OFFSET] // TODO: Can the thread ID really change during the loop? 987 ldxr w1, [x4] 988 cbnz w1, .Lnot_unlocked // already thin locked 989 stxr w3, w2, [x4] 990 cbnz w3, .Lstrex_fail // store failed, retry 991 dmb ishld // full (LoadLoad|LoadStore) memory barrier 992 ret 993.Lstrex_fail: 994 b .Lretry_lock // unlikely forward branch, need to reload and recheck r1/r2 995.Lnot_unlocked: 996 lsr w3, w1, 30 997 cbnz w3, .Lslow_lock // if either of the top two bits are set, go slow path 998 eor w2, w1, w2 // lock_word.ThreadId() ^ self->ThreadId() 999 uxth w2, w2 // zero top 16 bits 1000 cbnz w2, .Lslow_lock // lock word and self thread id's match -> recursive lock 1001 // else contention, go to slow path 1002 add w2, w1, #65536 // increment count in lock word placing in w2 for storing 1003 lsr w1, w2, 30 // if either of the top two bits are set, we overflowed. 1004 cbnz w1, .Lslow_lock // if we overflow the count go slow path 1005 str w2, [x0, #LOCK_WORD_OFFSET]// no need for stxr as we hold the lock 1006 ret 1007.Lslow_lock: 1008 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case we block 1009 mov x1, xSELF // pass Thread::Current 1010 mov x2, sp // pass SP 1011 bl artLockObjectFromCode // (Object* obj, Thread*, SP) 1012 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1013 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1014END art_quick_lock_object 1015 1016 /* 1017 * Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure. 1018 * x0 holds the possibly null object to lock. 1019 * 1020 * Derived from arm32 code. 1021 */ 1022 .extern artUnlockObjectFromCode 1023ENTRY art_quick_unlock_object 1024 cbz x0, .Lslow_unlock 1025 ldr w1, [x0, #LOCK_WORD_OFFSET] 1026 lsr w2, w1, 30 1027 cbnz w2, .Lslow_unlock // if either of the top two bits are set, go slow path 1028 ldr w2, [xSELF, #THREAD_ID_OFFSET] 1029 eor w3, w1, w2 // lock_word.ThreadId() ^ self->ThreadId() 1030 uxth w3, w3 // zero top 16 bits 1031 cbnz w3, .Lslow_unlock // do lock word and self thread id's match? 1032 cmp w1, #65536 1033 bpl .Lrecursive_thin_unlock 1034 // transition to unlocked, w3 holds 0 1035 dmb ish // full (LoadStore|StoreStore) memory barrier 1036 str w3, [x0, #LOCK_WORD_OFFSET] 1037 ret 1038.Lrecursive_thin_unlock: 1039 sub w1, w1, #65536 1040 str w1, [x0, #LOCK_WORD_OFFSET] 1041 ret 1042.Lslow_unlock: 1043 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case exception allocation triggers GC 1044 mov x1, xSELF // pass Thread::Current 1045 mov x2, sp // pass SP 1046 bl artUnlockObjectFromCode // (Object* obj, Thread*, SP) 1047 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1048 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1049END art_quick_unlock_object 1050 1051 /* 1052 * Entry from managed code that calls artIsAssignableFromCode and on failure calls 1053 * artThrowClassCastException. 1054 */ 1055 .extern artThrowClassCastException 1056ENTRY art_quick_check_cast 1057 // Store arguments and link register 1058 sub sp, sp, #32 // Stack needs to be 16b aligned on calls 1059 .cfi_adjust_cfa_offset 32 1060 stp x0, x1, [sp] 1061 .cfi_rel_offset x0, 0 1062 .cfi_rel_offset x1, 8 1063 stp xSELF, xLR, [sp, #16] 1064 .cfi_rel_offset x18, 16 1065 .cfi_rel_offset x30, 24 1066 1067 // Call runtime code 1068 bl artIsAssignableFromCode 1069 1070 // Check for exception 1071 cbz x0, .Lthrow_class_cast_exception 1072 1073 // Restore and return 1074 ldp x0, x1, [sp] 1075 .cfi_restore x0 1076 .cfi_restore x1 1077 ldp xSELF, xLR, [sp, #16] 1078 .cfi_restore x18 1079 .cfi_restore x30 1080 add sp, sp, #32 1081 .cfi_adjust_cfa_offset -32 1082 ret 1083 1084.Lthrow_class_cast_exception: 1085 // Restore 1086 ldp x0, x1, [sp] 1087 .cfi_restore x0 1088 .cfi_restore x1 1089 ldp xSELF, xLR, [sp, #16] 1090 .cfi_restore x18 1091 .cfi_restore x30 1092 add sp, sp, #32 1093 .cfi_adjust_cfa_offset -32 1094 1095 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context 1096 mov x2, xSELF // pass Thread::Current 1097 mov x3, sp // pass SP 1098 b artThrowClassCastException // (Class*, Class*, Thread*, SP) 1099 brk 0 // We should not return here... 1100END art_quick_check_cast 1101 1102 /* 1103 * Entry from managed code for array put operations of objects where the value being stored 1104 * needs to be checked for compatibility. 1105 * x0 = array, x1 = index, x2 = value 1106 * 1107 * Currently all values should fit into w0/w1/w2, and w1 always will as indices are 32b. We 1108 * assume, though, that the upper 32b are zeroed out. At least for x1/w1 we can do better by 1109 * using index-zero-extension in load/stores. 1110 * 1111 * Temporaries: x3, x4 1112 * TODO: x4 OK? ip seems wrong here. 1113 */ 1114ENTRY art_quick_aput_obj_with_null_and_bound_check 1115 tst x0, x0 1116 bne art_quick_aput_obj_with_bound_check 1117 b art_quick_throw_null_pointer_exception 1118END art_quick_aput_obj_with_null_and_bound_check 1119 1120ENTRY art_quick_aput_obj_with_bound_check 1121 ldr w3, [x0, #ARRAY_LENGTH_OFFSET] 1122 cmp w3, w1 1123 bhi art_quick_aput_obj 1124 mov x0, x1 1125 mov x1, x3 1126 b art_quick_throw_array_bounds 1127END art_quick_aput_obj_with_bound_check 1128 1129ENTRY art_quick_aput_obj 1130 cbz x2, .Ldo_aput_null 1131 ldr w3, [x0, #CLASS_OFFSET] // Heap reference = 32b 1132 // This also zero-extends to x3 1133 ldr w4, [x2, #CLASS_OFFSET] // Heap reference = 32b 1134 // This also zero-extends to x4 1135 ldr w3, [x3, #CLASS_COMPONENT_TYPE_OFFSET] // Heap reference = 32b 1136 // This also zero-extends to x3 1137 cmp w3, w4 // value's type == array's component type - trivial assignability 1138 bne .Lcheck_assignability 1139.Ldo_aput: 1140 add x3, x0, #OBJECT_ARRAY_DATA_OFFSET 1141 // "Compress" = do nothing 1142 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1143 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1144 lsr x0, x0, #7 1145 strb w3, [x3, x0] 1146 ret 1147.Ldo_aput_null: 1148 add x3, x0, #OBJECT_ARRAY_DATA_OFFSET 1149 // "Compress" = do nothing 1150 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1151 ret 1152.Lcheck_assignability: 1153 // Store arguments and link register 1154 sub sp, sp, #48 // Stack needs to be 16b aligned on calls 1155 .cfi_adjust_cfa_offset 48 1156 stp x0, x1, [sp] 1157 .cfi_rel_offset x0, 0 1158 .cfi_rel_offset x1, 8 1159 stp x2, xSELF, [sp, #16] 1160 .cfi_rel_offset x2, 16 1161 .cfi_rel_offset x18, 24 1162 str xLR, [sp, #32] 1163 .cfi_rel_offset x30, 32 1164 1165 // Call runtime code 1166 mov x0, x3 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1167 mov x1, x4 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended 1168 bl artIsAssignableFromCode 1169 1170 // Check for exception 1171 cbz x0, .Lthrow_array_store_exception 1172 1173 // Restore 1174 ldp x0, x1, [sp] 1175 .cfi_restore x0 1176 .cfi_restore x1 1177 ldp x2, xSELF, [sp, #16] 1178 .cfi_restore x2 1179 .cfi_restore x18 1180 ldr xLR, [sp, #32] 1181 .cfi_restore x30 1182 add sp, sp, #48 1183 .cfi_adjust_cfa_offset -48 1184 1185 add x3, x0, #OBJECT_ARRAY_DATA_OFFSET 1186 // "Compress" = do nothing 1187 str w2, [x3, x1, lsl #2] // Heap reference = 32b 1188 ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET] 1189 lsr x0, x0, #7 1190 strb w3, [x3, x0] 1191 ret 1192.Lthrow_array_store_exception: 1193 ldp x0, x1, [sp] 1194 .cfi_restore x0 1195 .cfi_restore x1 1196 ldp x2, xSELF, [sp, #16] 1197 .cfi_restore x2 1198 .cfi_restore x18 1199 ldr xLR, [sp, #32] 1200 .cfi_restore x30 1201 add sp, sp, #48 1202 .cfi_adjust_cfa_offset -48 1203 1204 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1205 mov x1, x2 // Pass value. 1206 mov x2, xSELF // Pass Thread::Current. 1207 mov x3, sp // Pass SP. 1208 b artThrowArrayStoreException // (Object*, Object*, Thread*, SP). 1209 brk 0 // Unreached. 1210END art_quick_aput_obj 1211 1212// Macro to facilitate adding new allocation entrypoints. 1213.macro TWO_ARG_DOWNCALL name, entrypoint, return 1214 .extern \entrypoint 1215ENTRY \name 1216 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1217 mov x2, xSELF // pass Thread::Current 1218 mov x3, sp // pass SP 1219 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP) 1220 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1221 \return 1222 DELIVER_PENDING_EXCEPTION 1223END \name 1224.endm 1225 1226// Macro to facilitate adding new array allocation entrypoints. 1227.macro THREE_ARG_DOWNCALL name, entrypoint, return 1228 .extern \entrypoint 1229ENTRY \name 1230 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1231 mov x3, xSELF // pass Thread::Current 1232 mov x4, sp // pass SP 1233 bl \entrypoint 1234 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1235 \return 1236 DELIVER_PENDING_EXCEPTION 1237END \name 1238.endm 1239 1240// Macros taking opportunity of code similarities for downcalls with referrer. 1241 1242// TODO: xSELF -> x19. Temporarily rely on xSELF being saved in REF_ONLY 1243.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return 1244 .extern \entrypoint 1245ENTRY \name 1246 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1247 ldr w1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1248 mov x2, xSELF // pass Thread::Current 1249 mov x3, sp // pass SP 1250 bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP) 1251 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1252 \return 1253END \name 1254.endm 1255 1256// TODO: xSELF -> x19. Temporarily rely on xSELF being saved in REF_ONLY 1257.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return 1258 .extern \entrypoint 1259ENTRY \name 1260 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1261 ldr w2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1262 mov x3, xSELF // pass Thread::Current 1263 mov x4, sp // pass SP 1264 bl \entrypoint 1265 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1266 \return 1267END \name 1268.endm 1269 1270// TODO: xSELF -> x19. Temporarily rely on xSELF being saved in REF_ONLY 1271.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return 1272 .extern \entrypoint 1273ENTRY \name 1274 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1275 ldr w3, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1276 mov x4, xSELF // pass Thread::Current 1277 mov x5, sp // pass SP 1278 bl \entrypoint 1279 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1280 \return 1281END \name 1282.endm 1283 1284 /* 1285 * Entry from managed code when uninitialized static storage, this stub will run the class 1286 * initializer and deliver the exception on error. On success the static storage base is 1287 * returned. 1288 */ 1289TWO_ARG_DOWNCALL art_quick_initialize_static_storage, artInitializeStaticStorageFromCode, RETURN_IF_RESULT_IS_NON_ZERO 1290 1291UNIMPLEMENTED art_quick_initialize_type 1292UNIMPLEMENTED art_quick_initialize_type_and_verify_access 1293 1294ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1295ONE_ARG_REF_DOWNCALL art_quick_get64_static, artGet64StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1296ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1297 1298TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1299TWO_ARG_REF_DOWNCALL art_quick_get64_instance, artGet64InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1300TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1 1301 1302TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1303TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1304 1305THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1306THREE_ARG_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1307THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER 1308 1309// This is separated out as the argument order is different. 1310 .extern artSet64StaticFromCode 1311ENTRY art_quick_set64_static 1312 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC 1313 mov x3, x1 // Store value 1314 ldr w1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer 1315 mov x2, x3 // Put value param 1316 mov x3, xSELF // pass Thread::Current 1317 mov x4, sp // pass SP 1318 bl artSet64StaticFromCode 1319 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME 1320 RETURN_IF_W0_IS_ZERO_OR_DELIVER 1321END art_quick_set64_static 1322 1323 /* 1324 * Entry from managed code to resolve a string, this stub will allocate a String and deliver an 1325 * exception on error. On success the String is returned. x0 holds the referring method, 1326 * w1 holds the string index. The fast path check for hit in strings cache has already been 1327 * performed. 1328 */ 1329TWO_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO 1330 1331// Generate the allocation entrypoints for each allocator. 1332GENERATE_ALL_ALLOC_ENTRYPOINTS 1333 1334 /* 1335 * Called by managed code when the value in wSUSPEND has been decremented to 0. 1336 */ 1337 .extern artTestSuspendFromCode 1338ENTRY art_quick_test_suspend 1339 ldrh w0, [xSELF, #THREAD_FLAGS_OFFSET] // get xSELF->state_and_flags.as_struct.flags 1340 mov wSUSPEND, #SUSPEND_CHECK_INTERVAL // reset wSUSPEND to SUSPEND_CHECK_INTERVAL 1341 cbnz w0, .Lneed_suspend // check flags == 0 1342 ret // return if flags == 0 1343.Lneed_suspend: 1344 mov x0, xSELF 1345 SETUP_REF_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl 1346 mov x1, sp 1347 bl artTestSuspendFromCode // (Thread*, SP) 1348 RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN 1349END art_quick_test_suspend 1350 1351 /* 1352 * Called by managed code that is attempting to call a method on a proxy class. On entry 1353 * x0 holds the proxy method and x1 holds the receiver; The frame size of the invoked proxy 1354 * method agrees with a ref and args callee save frame. 1355 */ 1356 .extern artQuickProxyInvokeHandler 1357ENTRY art_quick_proxy_invoke_handler 1358 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 1359 str x0, [sp, #0] // place proxy method at bottom of frame 1360 mov x2, xSELF // pass Thread::Current 1361 mov x3, sp // pass SP 1362 bl artQuickProxyInvokeHandler // (Method* proxy method, receiver, Thread*, SP) 1363 ldr xSELF, [sp, #200] // Restore self pointer. 1364 ldr x2, [xSELF, THREAD_EXCEPTION_OFFSET] 1365 cbnz x2, .Lexception_in_proxy // success if no exception is pending 1366 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME // Restore frame 1367 fmov d0, x0 // Store result in d0 in case it was float or double 1368 ret // return on success 1369.Lexception_in_proxy: 1370 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1371 DELIVER_PENDING_EXCEPTION 1372END art_quick_proxy_invoke_handler 1373 1374 /* 1375 * Called to resolve an imt conflict. x12 is a hidden argument that holds the target method's 1376 * dex method index. 1377 */ 1378ENTRY art_quick_imt_conflict_trampoline 1379 ldr w0, [sp, #0] // load caller Method* 1380 ldr w0, [x0, #METHOD_DEX_CACHE_METHODS_OFFSET] // load dex_cache_resolved_methods 1381 add x0, x0, #OBJECT_ARRAY_DATA_OFFSET // get starting address of data 1382 ldr w0, [x0, x12, lsl 2] // load the target method 1383 b art_quick_invoke_interface_trampoline 1384END art_quick_imt_conflict_trampoline 1385 1386ENTRY art_quick_resolution_trampoline 1387 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 1388 mov x2, xSELF 1389 mov x3, sp 1390 bl artQuickResolutionTrampoline // (called, receiver, Thread*, SP) 1391 cbz x0, 1f 1392 mov x9, x0 // Remember returned code pointer in x9. 1393 ldr w0, [sp, #0] // artQuickResolutionTrampoline puts called method in *SP. 1394 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1395 br x9 13961: 1397 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1398 DELIVER_PENDING_EXCEPTION 1399END art_quick_resolution_trampoline 1400 1401/* 1402 * Generic JNI frame layout: 1403 * 1404 * #-------------------# 1405 * | | 1406 * | caller method... | 1407 * #-------------------# <--- SP on entry 1408 * | Return X30/LR | 1409 * | X29/FP | callee save 1410 * | X28 | callee save 1411 * | X27 | callee save 1412 * | X26 | callee save 1413 * | X25 | callee save 1414 * | X24 | callee save 1415 * | X23 | callee save 1416 * | X22 | callee save 1417 * | X21 | callee save 1418 * | X20 | callee save 1419 * | X19 | callee save 1420 * | X7 | arg7 1421 * | X6 | arg6 1422 * | X5 | arg5 1423 * | X4 | arg4 1424 * | X3 | arg3 1425 * | X2 | arg2 1426 * | X1 | arg1 1427 * | D15 | float arg 8 1428 * | D14 | float arg 8 1429 * | D13 | float arg 8 1430 * | D12 | callee save 1431 * | D11 | callee save 1432 * | D10 | callee save 1433 * | D9 | callee save 1434 * | D8 | callee save 1435 * | D7 | float arg 8 1436 * | D6 | float arg 7 1437 * | D5 | float arg 6 1438 * | D4 | float arg 5 1439 * | D3 | float arg 4 1440 * | D2 | float arg 3 1441 * | D1 | float arg 2 1442 * | D0 | float arg 1 1443 * | Method* | <- X0 1444 * #-------------------# 1445 * | local ref cookie | // 4B 1446 * | handle scope size | // 4B 1447 * #-------------------# 1448 * | JNI Call Stack | 1449 * #-------------------# <--- SP on native call 1450 * | | 1451 * | Stack for Regs | The trampoline assembly will pop these values 1452 * | | into registers for native call 1453 * #-------------------# 1454 * | Native code ptr | 1455 * #-------------------# 1456 * | Free scratch | 1457 * #-------------------# 1458 * | Ptr to (1) | <--- SP 1459 * #-------------------# 1460 */ 1461 /* 1462 * Called to do a generic JNI down-call 1463 */ 1464ENTRY art_quick_generic_jni_trampoline 1465 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL 1466 str x0, [sp, #0] // Store native ArtMethod* to bottom of stack. 1467 1468 // Save SP , so we can have static CFI info. 1469 mov x28, sp 1470 .cfi_def_cfa_register x28 1471 1472 // This looks the same, but is different: this will be updated to point to the bottom 1473 // of the frame when the handle scope is inserted. 1474 mov xFP, sp 1475 1476 mov x8, #5120 1477 sub sp, sp, x8 1478 1479 // prepare for artQuickGenericJniTrampoline call 1480 // (Thread*, SP) 1481 // x0 x1 <= C calling convention 1482 // xSELF xFP <= where they are 1483 1484 mov x0, xSELF // Thread* 1485 mov x1, xFP 1486 bl artQuickGenericJniTrampoline // (Thread*, sp) 1487 1488 // Get the updated pointer. This is the bottom of the frame _with_ handle scope. 1489 ldr xFP, [sp] 1490 add x9, sp, #8 1491 1492 cmp x0, #0 1493 b.mi .Lentry_error // Check for error, negative value. 1494 1495 // release part of the alloca. 1496 add x9, x9, x0 1497 1498 // Get the code pointer 1499 ldr xIP0, [x9, #0] 1500 1501 // Load parameters from frame into registers. 1502 // TODO Check with artQuickGenericJniTrampoline. 1503 // Also, check again APPCS64 - the stack arguments are interleaved. 1504 ldp x0, x1, [x9, #8] 1505 ldp x2, x3, [x9, #24] 1506 ldp x4, x5, [x9, #40] 1507 ldp x6, x7, [x9, #56] 1508 1509 ldp d0, d1, [x9, #72] 1510 ldp d2, d3, [x9, #88] 1511 ldp d4, d5, [x9, #104] 1512 ldp d6, d7, [x9, #120] 1513 1514 add sp, x9, #136 1515 1516 blr xIP0 // native call. 1517 1518 // Restore self pointer. 1519 ldr xSELF, [x28, #200] 1520 1521 // result sign extension is handled in C code 1522 // prepare for artQuickGenericJniEndTrampoline call 1523 // (Thread*, SP, result, result_f) 1524 // x0 x1 x2 x3 <= C calling convention 1525 mov x5, x0 // Save return value 1526 mov x0, xSELF // Thread register 1527 mov x1, xFP // Stack pointer 1528 mov x2, x5 // Result (from saved) 1529 fmov x3, d0 // d0 will contain floating point result, but needs to go into x3 1530 1531 bl artQuickGenericJniEndTrampoline 1532 1533 // Tear down the alloca. 1534 mov sp, x28 1535 .cfi_def_cfa_register sp 1536 1537 // Restore self pointer. 1538 ldr xSELF, [x28, #200] 1539 1540 // Pending exceptions possible. 1541 ldr x1, [xSELF, THREAD_EXCEPTION_OFFSET] 1542 cbnz x1, .Lexception_in_native 1543 1544 // Tear down the callee-save frame. 1545 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1546 1547 // store into fpr, for when it's a fpr return... 1548 fmov d0, x0 1549 ret 1550 1551.Lentry_error: 1552 mov sp, x28 1553 .cfi_def_cfa_register sp 1554 ldr xSELF, [x28, #200] 1555.Lexception_in_native: 1556 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME 1557 DELIVER_PENDING_EXCEPTION 1558 1559END art_quick_generic_jni_trampoline 1560 1561/* 1562 * Called to bridge from the quick to interpreter ABI. On entry the arguments match those 1563 * of a quick call: 1564 * x0 = method being called/to bridge to. 1565 * x1..x7, d0..d7 = arguments to that method. 1566 */ 1567ENTRY art_quick_to_interpreter_bridge 1568 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME // Set up frame and save arguments. 1569 1570 // x0 will contain mirror::ArtMethod* method. 1571 mov x1, xSELF // How to get Thread::Current() ??? 1572 mov x2, sp 1573 1574 // uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self, 1575 // mirror::ArtMethod** sp) 1576 bl artQuickToInterpreterBridge 1577 1578 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME // TODO: no need to restore arguments in this case. 1579 1580 fmov d0, x0 1581 1582 RETURN_OR_DELIVER_PENDING_EXCEPTION 1583END art_quick_to_interpreter_bridge 1584 1585 1586// 1587// Instrumentation-related stubs 1588// 1589 .extern artInstrumentationMethodEntryFromCode 1590ENTRY art_quick_instrumentation_entry 1591 SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME 1592 1593 mov x19, x0 // Preserve method reference in a callee-save. 1594 1595 mov x2, xSELF 1596 mov x3, sp 1597 mov x4, xLR 1598 bl artInstrumentationMethodEntryFromCode // (Method*, Object*, Thread*, SP, LR) 1599 1600 mov x9, x0 // x0 = result of call. 1601 mov x0, x19 // Reload method reference. 1602 1603 RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME // Note: will restore xSELF 1604 adr xLR, art_quick_instrumentation_exit 1605 br x9 // Tail-call method with lr set to art_quick_instrumentation_exit. 1606END art_quick_instrumentation_entry 1607 1608 .extern artInstrumentationMethodExitFromCode 1609ENTRY art_quick_instrumentation_exit 1610 mov xLR, #0 // Clobber LR for later checks. 1611 1612 SETUP_REF_ONLY_CALLEE_SAVE_FRAME 1613 1614 // We need to save x0 and d0. We could use a callee-save from SETUP_REF_ONLY, but then 1615 // we would need to fully restore it. As there are a lot of callee-save registers, it seems 1616 // easier to have an extra small stack area. 1617 1618 str x19, [sp, #-16]! // Save integer result. 1619 .cfi_adjust_cfa_offset 16 1620 str d0, [sp, #8] // Save floating-point result. 1621 1622 mov x0, xSELF // Pass Thread. 1623 add x1, sp, #16 // Pass SP. 1624 mov x2, x0 // Pass integer result. 1625 fmov x3, d0 // Pass floating-point result. 1626 bl artInstrumentationMethodExitFromCode // (Thread*, SP, gpr_res, fpr_res) 1627 1628 mov x9, x0 // Return address from instrumentation call. 1629 mov xLR, x1 // r1 is holding link register if we're to bounce to deoptimize 1630 1631 ldr d0, [sp, #8] // Restore floating-point result. 1632 ldr x0, [sp], 16 // Restore integer result, and drop stack area. 1633 .cfi_adjust_cfa_offset 16 1634 1635 POP_REF_ONLY_CALLEE_SAVE_FRAME 1636 1637 br x9 // Tail-call out. 1638END art_quick_instrumentation_exit 1639 1640 /* 1641 * Instrumentation has requested that we deoptimize into the interpreter. The deoptimization 1642 * will long jump to the upcall with a special exception of -1. 1643 */ 1644 .extern artDeoptimize 1645ENTRY art_quick_deoptimize 1646 SETUP_SAVE_ALL_CALLEE_SAVE_FRAME 1647 mov x0, xSELF // Pass thread. 1648 mov x1, sp // Pass SP. 1649 bl artDeoptimize // artDeoptimize(Thread*, SP) 1650END art_quick_deoptimize 1651 1652 1653 /* 1654 * String's indexOf. 1655 * 1656 * TODO: Not very optimized. 1657 * On entry: 1658 * x0: string object (known non-null) 1659 * w1: char to match (known <= 0xFFFF) 1660 * w2: Starting offset in string data 1661 */ 1662ENTRY art_quick_indexof 1663 ldr w3, [x0, #STRING_COUNT_OFFSET] 1664 ldr w4, [x0, #STRING_OFFSET_OFFSET] 1665 ldr w0, [x0, #STRING_VALUE_OFFSET] // x0 ? 1666 1667 /* Clamp start to [0..count] */ 1668 cmp w2, #0 1669 csel w2, wzr, w2, lt 1670 cmp w2, w3 1671 csel w2, w3, w2, gt 1672 1673 /* Build a pointer to the start of the string data */ 1674 add x0, x0, #STRING_DATA_OFFSET 1675 add x0, x0, x4, lsl #1 1676 1677 /* Save a copy to compute result */ 1678 mov x5, x0 1679 1680 /* Build pointer to start of data to compare and pre-bias */ 1681 add x0, x0, x2, lsl #1 1682 sub x0, x0, #2 1683 1684 /* Compute iteration count */ 1685 sub w2, w3, w2 1686 1687 /* 1688 * At this point we have: 1689 * x0: start of the data to test 1690 * w1: char to compare 1691 * w2: iteration count 1692 * x5: original start of string data 1693 */ 1694 1695 subs w2, w2, #4 1696 b.lt .Lindexof_remainder 1697 1698.Lindexof_loop4: 1699 ldrh w6, [x0, #2]! 1700 ldrh w7, [x0, #2]! 1701 ldrh w8, [x0, #2]! 1702 ldrh w9, [x0, #2]! 1703 cmp w6, w1 1704 b.eq .Lmatch_0 1705 cmp w7, w1 1706 b.eq .Lmatch_1 1707 cmp w8, w1 1708 b.eq .Lmatch_2 1709 cmp w9, w1 1710 b.eq .Lmatch_3 1711 subs w2, w2, #4 1712 b.ge .Lindexof_loop4 1713 1714.Lindexof_remainder: 1715 adds w2, w2, #4 1716 b.eq .Lindexof_nomatch 1717 1718.Lindexof_loop1: 1719 ldrh w6, [x0, #2]! 1720 cmp w6, w1 1721 b.eq .Lmatch_3 1722 subs w2, w2, #1 1723 b.ne .Lindexof_loop1 1724 1725.Lindexof_nomatch: 1726 mov x0, #-1 1727 ret 1728 1729.Lmatch_0: 1730 sub x0, x0, #6 1731 sub x0, x0, x5 1732 asr x0, x0, #1 1733 ret 1734.Lmatch_1: 1735 sub x0, x0, #4 1736 sub x0, x0, x5 1737 asr x0, x0, #1 1738 ret 1739.Lmatch_2: 1740 sub x0, x0, #2 1741 sub x0, x0, x5 1742 asr x0, x0, #1 1743 ret 1744.Lmatch_3: 1745 sub x0, x0, x5 1746 asr x0, x0, #1 1747 ret 1748END art_quick_indexof 1749 1750 /* 1751 * String's compareTo. 1752 * 1753 * TODO: Not very optimized. 1754 * 1755 * On entry: 1756 * x0: this object pointer 1757 * x1: comp object pointer 1758 * 1759 */ 1760 .extern memcmp16_generic_static 1761ENTRY art_quick_string_compareto 1762 mov x2, x0 // x0 is return, use x2 for first input. 1763 sub x0, x2, x1 // Same string object? 1764 cbnz x0,1f 1765 ret 17661: // Different string objects. 1767 1768 ldr w6, [x2, #STRING_OFFSET_OFFSET] 1769 ldr w5, [x1, #STRING_OFFSET_OFFSET] 1770 ldr w4, [x2, #STRING_COUNT_OFFSET] 1771 ldr w3, [x1, #STRING_COUNT_OFFSET] 1772 ldr w2, [x2, #STRING_VALUE_OFFSET] 1773 ldr w1, [x1, #STRING_VALUE_OFFSET] 1774 1775 /* 1776 * Now: CharArray* Offset Count 1777 * first arg x2 w6 w4 1778 * second arg x1 w5 w3 1779 */ 1780 1781 // x0 := str1.length(w4) - str2.length(w3). ldr zero-extended w3/w4 into x3/x4. 1782 subs x0, x4, x3 1783 // Min(count1, count2) into w3. 1784 csel x3, x3, x4, ge 1785 1786 // Build pointer into string data. 1787 1788 // Add offset in array (substr etc.) (sign extend and << 1). 1789 add x2, x2, w6, sxtw #1 1790 add x1, x1, w5, sxtw #1 1791 1792 // Add offset in CharArray to array. 1793 add x2, x2, #STRING_DATA_OFFSET 1794 add x1, x1, #STRING_DATA_OFFSET 1795 1796 // TODO: Tune this value. 1797 // Check for long string, do memcmp16 for them. 1798 cmp w3, #28 // Constant from arm32. 1799 bgt .Ldo_memcmp16 1800 1801 /* 1802 * Now: 1803 * x2: *first string data 1804 * x1: *second string data 1805 * w3: iteration count 1806 * x0: return value if comparison equal 1807 * x4, x5, x6, x7: free 1808 */ 1809 1810 // Do a simple unrolled loop. 1811.Lloop: 1812 // At least two more elements? 1813 subs w3, w3, #2 1814 b.lt .Lremainder_or_done 1815 1816 ldrh w4, [x2], #2 1817 ldrh w5, [x1], #2 1818 1819 ldrh w6, [x2], #2 1820 ldrh w7, [x1], #2 1821 1822 subs w4, w4, w5 1823 b.ne .Lw4_result 1824 1825 subs w6, w6, w7 1826 b.ne .Lw6_result 1827 1828 b .Lloop 1829 1830.Lremainder_or_done: 1831 adds w3, w3, #1 1832 b.eq .Lremainder 1833 ret 1834 1835.Lremainder: 1836 ldrh w4, [x2], #2 1837 ldrh w5, [x1], #2 1838 subs w4, w4, w5 1839 b.ne .Lw4_result 1840 ret 1841 1842// Result is in w4 1843.Lw4_result: 1844 sxtw x0, w4 1845 ret 1846 1847// Result is in w6 1848.Lw6_result: 1849 sxtw x0, w6 1850 ret 1851 1852.Ldo_memcmp16: 1853 str x0, [sp,#-16]! // Save x0 1854 1855 mov x0, x2 1856 uxtw x2, w3 1857 bl memcmp16_generic_static 1858 1859 ldr x1, [sp], #16 // Restore old x0 = length diff 1860 1861 cmp x0, #0 // Check the memcmp difference 1862 csel x0, x0, x1, ne // x0 := x0 != 0 ? x0 : x1 1863 ret 1864END art_quick_string_compareto 1865