1// Copyright 2009 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5#include "go_asm.h" 6#include "go_tls.h" 7#include "funcdata.h" 8#include "textflag.h" 9 10// _rt0_amd64 is common startup code for most amd64 systems when using 11// internal linking. This is the entry point for the program from the 12// kernel for an ordinary -buildmode=exe program. The stack holds the 13// number of arguments and the C-style argv. 14TEXT _rt0_amd64(SB),NOSPLIT,$-8 15 MOVQ 0(SP), DI // argc 16 LEAQ 8(SP), SI // argv 17 JMP runtime·rt0_go(SB) 18 19// main is common startup code for most amd64 systems when using 20// external linking. The C startup code will call the symbol "main" 21// passing argc and argv in the usual C ABI registers DI and SI. 22TEXT main(SB),NOSPLIT,$-8 23 JMP runtime·rt0_go(SB) 24 25// _rt0_amd64_lib is common startup code for most amd64 systems when 26// using -buildmode=c-archive or -buildmode=c-shared. The linker will 27// arrange to invoke this function as a global constructor (for 28// c-archive) or when the shared library is loaded (for c-shared). 29// We expect argc and argv to be passed in the usual C ABI registers 30// DI and SI. 31TEXT _rt0_amd64_lib(SB),NOSPLIT,$0x50 32 // Align stack per ELF ABI requirements. 33 MOVQ SP, AX 34 ANDQ $~15, SP 35 // Save C ABI callee-saved registers, as caller may need them. 36 MOVQ BX, 0x10(SP) 37 MOVQ BP, 0x18(SP) 38 MOVQ R12, 0x20(SP) 39 MOVQ R13, 0x28(SP) 40 MOVQ R14, 0x30(SP) 41 MOVQ R15, 0x38(SP) 42 MOVQ AX, 0x40(SP) 43 44 MOVQ DI, _rt0_amd64_lib_argc<>(SB) 45 MOVQ SI, _rt0_amd64_lib_argv<>(SB) 46 47 // Synchronous initialization. 48 CALL runtime·libpreinit(SB) 49 50 // Create a new thread to finish Go runtime initialization. 51 MOVQ _cgo_sys_thread_create(SB), AX 52 TESTQ AX, AX 53 JZ nocgo 54 MOVQ $_rt0_amd64_lib_go(SB), DI 55 MOVQ $0, SI 56 CALL AX 57 JMP restore 58 59nocgo: 60 MOVQ $0x800000, 0(SP) // stacksize 61 MOVQ $_rt0_amd64_lib_go(SB), AX 62 MOVQ AX, 8(SP) // fn 63 CALL runtime·newosproc0(SB) 64 65restore: 66 MOVQ 0x10(SP), BX 67 MOVQ 0x18(SP), BP 68 MOVQ 0x20(SP), R12 69 MOVQ 0x28(SP), R13 70 MOVQ 0x30(SP), R14 71 MOVQ 0x38(SP), R15 72 MOVQ 0x40(SP), SP 73 RET 74 75// _rt0_amd64_lib_go initializes the Go runtime. 76// This is started in a separate thread by _rt0_amd64_lib. 77TEXT _rt0_amd64_lib_go(SB),NOSPLIT,$0 78 MOVQ _rt0_amd64_lib_argc<>(SB), DI 79 MOVQ _rt0_amd64_lib_argv<>(SB), SI 80 JMP runtime·rt0_go(SB) 81 82DATA _rt0_amd64_lib_argc<>(SB)/8, $0 83GLOBL _rt0_amd64_lib_argc<>(SB),NOPTR, $8 84DATA _rt0_amd64_lib_argv<>(SB)/8, $0 85GLOBL _rt0_amd64_lib_argv<>(SB),NOPTR, $8 86 87TEXT runtime·rt0_go(SB),NOSPLIT,$0 88 // copy arguments forward on an even stack 89 MOVQ DI, AX // argc 90 MOVQ SI, BX // argv 91 SUBQ $(4*8+7), SP // 2args 2auto 92 ANDQ $~15, SP 93 MOVQ AX, 16(SP) 94 MOVQ BX, 24(SP) 95 96 // create istack out of the given (operating system) stack. 97 // _cgo_init may update stackguard. 98 MOVQ $runtime·g0(SB), DI 99 LEAQ (-64*1024+104)(SP), BX 100 MOVQ BX, g_stackguard0(DI) 101 MOVQ BX, g_stackguard1(DI) 102 MOVQ BX, (g_stack+stack_lo)(DI) 103 MOVQ SP, (g_stack+stack_hi)(DI) 104 105 // find out information about the processor we're on 106 MOVL $0, AX 107 CPUID 108 MOVL AX, SI 109 CMPL AX, $0 110 JE nocpuinfo 111 112 // Figure out how to serialize RDTSC. 113 // On Intel processors LFENCE is enough. AMD requires MFENCE. 114 // Don't know about the rest, so let's do MFENCE. 115 CMPL BX, $0x756E6547 // "Genu" 116 JNE notintel 117 CMPL DX, $0x49656E69 // "ineI" 118 JNE notintel 119 CMPL CX, $0x6C65746E // "ntel" 120 JNE notintel 121 MOVB $1, runtime·isIntel(SB) 122 MOVB $1, runtime·lfenceBeforeRdtsc(SB) 123notintel: 124 125 // Load EAX=1 cpuid flags 126 MOVL $1, AX 127 CPUID 128 MOVL AX, runtime·processorVersionInfo(SB) 129 130nocpuinfo: 131 // if there is an _cgo_init, call it. 132 MOVQ _cgo_init(SB), AX 133 TESTQ AX, AX 134 JZ needtls 135 // g0 already in DI 136 MOVQ DI, CX // Win64 uses CX for first parameter 137 MOVQ $setg_gcc<>(SB), SI 138 CALL AX 139 140 // update stackguard after _cgo_init 141 MOVQ $runtime·g0(SB), CX 142 MOVQ (g_stack+stack_lo)(CX), AX 143 ADDQ $const__StackGuard, AX 144 MOVQ AX, g_stackguard0(CX) 145 MOVQ AX, g_stackguard1(CX) 146 147#ifndef GOOS_windows 148 JMP ok 149#endif 150needtls: 151#ifdef GOOS_plan9 152 // skip TLS setup on Plan 9 153 JMP ok 154#endif 155#ifdef GOOS_solaris 156 // skip TLS setup on Solaris 157 JMP ok 158#endif 159#ifdef GOOS_darwin 160 // skip TLS setup on Darwin 161 JMP ok 162#endif 163 164 LEAQ runtime·m0+m_tls(SB), DI 165 CALL runtime·settls(SB) 166 167 // store through it, to make sure it works 168 get_tls(BX) 169 MOVQ $0x123, g(BX) 170 MOVQ runtime·m0+m_tls(SB), AX 171 CMPQ AX, $0x123 172 JEQ 2(PC) 173 CALL runtime·abort(SB) 174ok: 175 // set the per-goroutine and per-mach "registers" 176 get_tls(BX) 177 LEAQ runtime·g0(SB), CX 178 MOVQ CX, g(BX) 179 LEAQ runtime·m0(SB), AX 180 181 // save m->g0 = g0 182 MOVQ CX, m_g0(AX) 183 // save m0 to g0->m 184 MOVQ AX, g_m(CX) 185 186 CLD // convention is D is always left cleared 187 CALL runtime·check(SB) 188 189 MOVL 16(SP), AX // copy argc 190 MOVL AX, 0(SP) 191 MOVQ 24(SP), AX // copy argv 192 MOVQ AX, 8(SP) 193 CALL runtime·args(SB) 194 CALL runtime·osinit(SB) 195 CALL runtime·schedinit(SB) 196 197 // create a new goroutine to start program 198 MOVQ $runtime·mainPC(SB), AX // entry 199 PUSHQ AX 200 PUSHQ $0 // arg size 201 CALL runtime·newproc(SB) 202 POPQ AX 203 POPQ AX 204 205 // start this M 206 CALL runtime·mstart(SB) 207 208 CALL runtime·abort(SB) // mstart should never return 209 RET 210 211 // Prevent dead-code elimination of debugCallV1, which is 212 // intended to be called by debuggers. 213 MOVQ $runtime·debugCallV1(SB), AX 214 RET 215 216DATA runtime·mainPC+0(SB)/8,$runtime·main(SB) 217GLOBL runtime·mainPC(SB),RODATA,$8 218 219TEXT runtime·breakpoint(SB),NOSPLIT,$0-0 220 BYTE $0xcc 221 RET 222 223TEXT runtime·asminit(SB),NOSPLIT,$0-0 224 // No per-thread init. 225 RET 226 227/* 228 * go-routine 229 */ 230 231// func gosave(buf *gobuf) 232// save state in Gobuf; setjmp 233TEXT runtime·gosave(SB), NOSPLIT, $0-8 234 MOVQ buf+0(FP), AX // gobuf 235 LEAQ buf+0(FP), BX // caller's SP 236 MOVQ BX, gobuf_sp(AX) 237 MOVQ 0(SP), BX // caller's PC 238 MOVQ BX, gobuf_pc(AX) 239 MOVQ $0, gobuf_ret(AX) 240 MOVQ BP, gobuf_bp(AX) 241 // Assert ctxt is zero. See func save. 242 MOVQ gobuf_ctxt(AX), BX 243 TESTQ BX, BX 244 JZ 2(PC) 245 CALL runtime·badctxt(SB) 246 get_tls(CX) 247 MOVQ g(CX), BX 248 MOVQ BX, gobuf_g(AX) 249 RET 250 251// func gogo(buf *gobuf) 252// restore state from Gobuf; longjmp 253TEXT runtime·gogo(SB), NOSPLIT, $16-8 254 MOVQ buf+0(FP), BX // gobuf 255 MOVQ gobuf_g(BX), DX 256 MOVQ 0(DX), CX // make sure g != nil 257 get_tls(CX) 258 MOVQ DX, g(CX) 259 MOVQ gobuf_sp(BX), SP // restore SP 260 MOVQ gobuf_ret(BX), AX 261 MOVQ gobuf_ctxt(BX), DX 262 MOVQ gobuf_bp(BX), BP 263 MOVQ $0, gobuf_sp(BX) // clear to help garbage collector 264 MOVQ $0, gobuf_ret(BX) 265 MOVQ $0, gobuf_ctxt(BX) 266 MOVQ $0, gobuf_bp(BX) 267 MOVQ gobuf_pc(BX), BX 268 JMP BX 269 270// func mcall(fn func(*g)) 271// Switch to m->g0's stack, call fn(g). 272// Fn must never return. It should gogo(&g->sched) 273// to keep running g. 274TEXT runtime·mcall(SB), NOSPLIT, $0-8 275 MOVQ fn+0(FP), DI 276 277 get_tls(CX) 278 MOVQ g(CX), AX // save state in g->sched 279 MOVQ 0(SP), BX // caller's PC 280 MOVQ BX, (g_sched+gobuf_pc)(AX) 281 LEAQ fn+0(FP), BX // caller's SP 282 MOVQ BX, (g_sched+gobuf_sp)(AX) 283 MOVQ AX, (g_sched+gobuf_g)(AX) 284 MOVQ BP, (g_sched+gobuf_bp)(AX) 285 286 // switch to m->g0 & its stack, call fn 287 MOVQ g(CX), BX 288 MOVQ g_m(BX), BX 289 MOVQ m_g0(BX), SI 290 CMPQ SI, AX // if g == m->g0 call badmcall 291 JNE 3(PC) 292 MOVQ $runtime·badmcall(SB), AX 293 JMP AX 294 MOVQ SI, g(CX) // g = m->g0 295 MOVQ (g_sched+gobuf_sp)(SI), SP // sp = m->g0->sched.sp 296 PUSHQ AX 297 MOVQ DI, DX 298 MOVQ 0(DI), DI 299 CALL DI 300 POPQ AX 301 MOVQ $runtime·badmcall2(SB), AX 302 JMP AX 303 RET 304 305// systemstack_switch is a dummy routine that systemstack leaves at the bottom 306// of the G stack. We need to distinguish the routine that 307// lives at the bottom of the G stack from the one that lives 308// at the top of the system stack because the one at the top of 309// the system stack terminates the stack walk (see topofstack()). 310TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0 311 RET 312 313// func systemstack(fn func()) 314TEXT runtime·systemstack(SB), NOSPLIT, $0-8 315 MOVQ fn+0(FP), DI // DI = fn 316 get_tls(CX) 317 MOVQ g(CX), AX // AX = g 318 MOVQ g_m(AX), BX // BX = m 319 320 CMPQ AX, m_gsignal(BX) 321 JEQ noswitch 322 323 MOVQ m_g0(BX), DX // DX = g0 324 CMPQ AX, DX 325 JEQ noswitch 326 327 CMPQ AX, m_curg(BX) 328 JNE bad 329 330 // switch stacks 331 // save our state in g->sched. Pretend to 332 // be systemstack_switch if the G stack is scanned. 333 MOVQ $runtime·systemstack_switch(SB), SI 334 MOVQ SI, (g_sched+gobuf_pc)(AX) 335 MOVQ SP, (g_sched+gobuf_sp)(AX) 336 MOVQ AX, (g_sched+gobuf_g)(AX) 337 MOVQ BP, (g_sched+gobuf_bp)(AX) 338 339 // switch to g0 340 MOVQ DX, g(CX) 341 MOVQ (g_sched+gobuf_sp)(DX), BX 342 // make it look like mstart called systemstack on g0, to stop traceback 343 SUBQ $8, BX 344 MOVQ $runtime·mstart(SB), DX 345 MOVQ DX, 0(BX) 346 MOVQ BX, SP 347 348 // call target function 349 MOVQ DI, DX 350 MOVQ 0(DI), DI 351 CALL DI 352 353 // switch back to g 354 get_tls(CX) 355 MOVQ g(CX), AX 356 MOVQ g_m(AX), BX 357 MOVQ m_curg(BX), AX 358 MOVQ AX, g(CX) 359 MOVQ (g_sched+gobuf_sp)(AX), SP 360 MOVQ $0, (g_sched+gobuf_sp)(AX) 361 RET 362 363noswitch: 364 // already on m stack; tail call the function 365 // Using a tail call here cleans up tracebacks since we won't stop 366 // at an intermediate systemstack. 367 MOVQ DI, DX 368 MOVQ 0(DI), DI 369 JMP DI 370 371bad: 372 // Bad: g is not gsignal, not g0, not curg. What is it? 373 MOVQ $runtime·badsystemstack(SB), AX 374 CALL AX 375 INT $3 376 377 378/* 379 * support for morestack 380 */ 381 382// Called during function prolog when more stack is needed. 383// 384// The traceback routines see morestack on a g0 as being 385// the top of a stack (for example, morestack calling newstack 386// calling the scheduler calling newm calling gc), so we must 387// record an argument size. For that purpose, it has no arguments. 388TEXT runtime·morestack(SB),NOSPLIT,$0-0 389 // Cannot grow scheduler stack (m->g0). 390 get_tls(CX) 391 MOVQ g(CX), BX 392 MOVQ g_m(BX), BX 393 MOVQ m_g0(BX), SI 394 CMPQ g(CX), SI 395 JNE 3(PC) 396 CALL runtime·badmorestackg0(SB) 397 CALL runtime·abort(SB) 398 399 // Cannot grow signal stack (m->gsignal). 400 MOVQ m_gsignal(BX), SI 401 CMPQ g(CX), SI 402 JNE 3(PC) 403 CALL runtime·badmorestackgsignal(SB) 404 CALL runtime·abort(SB) 405 406 // Called from f. 407 // Set m->morebuf to f's caller. 408 MOVQ 8(SP), AX // f's caller's PC 409 MOVQ AX, (m_morebuf+gobuf_pc)(BX) 410 LEAQ 16(SP), AX // f's caller's SP 411 MOVQ AX, (m_morebuf+gobuf_sp)(BX) 412 get_tls(CX) 413 MOVQ g(CX), SI 414 MOVQ SI, (m_morebuf+gobuf_g)(BX) 415 416 // Set g->sched to context in f. 417 MOVQ 0(SP), AX // f's PC 418 MOVQ AX, (g_sched+gobuf_pc)(SI) 419 MOVQ SI, (g_sched+gobuf_g)(SI) 420 LEAQ 8(SP), AX // f's SP 421 MOVQ AX, (g_sched+gobuf_sp)(SI) 422 MOVQ BP, (g_sched+gobuf_bp)(SI) 423 MOVQ DX, (g_sched+gobuf_ctxt)(SI) 424 425 // Call newstack on m->g0's stack. 426 MOVQ m_g0(BX), BX 427 MOVQ BX, g(CX) 428 MOVQ (g_sched+gobuf_sp)(BX), SP 429 CALL runtime·newstack(SB) 430 CALL runtime·abort(SB) // crash if newstack returns 431 RET 432 433// morestack but not preserving ctxt. 434TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0 435 MOVL $0, DX 436 JMP runtime·morestack(SB) 437 438// reflectcall: call a function with the given argument list 439// func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32). 440// we don't have variable-sized frames, so we use a small number 441// of constant-sized-frame functions to encode a few bits of size in the pc. 442// Caution: ugly multiline assembly macros in your future! 443 444#define DISPATCH(NAME,MAXSIZE) \ 445 CMPQ CX, $MAXSIZE; \ 446 JA 3(PC); \ 447 MOVQ $NAME(SB), AX; \ 448 JMP AX 449// Note: can't just "JMP NAME(SB)" - bad inlining results. 450 451TEXT ·reflectcall(SB), NOSPLIT, $0-32 452 MOVLQZX argsize+24(FP), CX 453 DISPATCH(runtime·call32, 32) 454 DISPATCH(runtime·call64, 64) 455 DISPATCH(runtime·call128, 128) 456 DISPATCH(runtime·call256, 256) 457 DISPATCH(runtime·call512, 512) 458 DISPATCH(runtime·call1024, 1024) 459 DISPATCH(runtime·call2048, 2048) 460 DISPATCH(runtime·call4096, 4096) 461 DISPATCH(runtime·call8192, 8192) 462 DISPATCH(runtime·call16384, 16384) 463 DISPATCH(runtime·call32768, 32768) 464 DISPATCH(runtime·call65536, 65536) 465 DISPATCH(runtime·call131072, 131072) 466 DISPATCH(runtime·call262144, 262144) 467 DISPATCH(runtime·call524288, 524288) 468 DISPATCH(runtime·call1048576, 1048576) 469 DISPATCH(runtime·call2097152, 2097152) 470 DISPATCH(runtime·call4194304, 4194304) 471 DISPATCH(runtime·call8388608, 8388608) 472 DISPATCH(runtime·call16777216, 16777216) 473 DISPATCH(runtime·call33554432, 33554432) 474 DISPATCH(runtime·call67108864, 67108864) 475 DISPATCH(runtime·call134217728, 134217728) 476 DISPATCH(runtime·call268435456, 268435456) 477 DISPATCH(runtime·call536870912, 536870912) 478 DISPATCH(runtime·call1073741824, 1073741824) 479 MOVQ $runtime·badreflectcall(SB), AX 480 JMP AX 481 482#define CALLFN(NAME,MAXSIZE) \ 483TEXT NAME(SB), WRAPPER, $MAXSIZE-32; \ 484 NO_LOCAL_POINTERS; \ 485 /* copy arguments to stack */ \ 486 MOVQ argptr+16(FP), SI; \ 487 MOVLQZX argsize+24(FP), CX; \ 488 MOVQ SP, DI; \ 489 REP;MOVSB; \ 490 /* call function */ \ 491 MOVQ f+8(FP), DX; \ 492 PCDATA $PCDATA_StackMapIndex, $0; \ 493 CALL (DX); \ 494 /* copy return values back */ \ 495 MOVQ argtype+0(FP), DX; \ 496 MOVQ argptr+16(FP), DI; \ 497 MOVLQZX argsize+24(FP), CX; \ 498 MOVLQZX retoffset+28(FP), BX; \ 499 MOVQ SP, SI; \ 500 ADDQ BX, DI; \ 501 ADDQ BX, SI; \ 502 SUBQ BX, CX; \ 503 CALL callRet<>(SB); \ 504 RET 505 506// callRet copies return values back at the end of call*. This is a 507// separate function so it can allocate stack space for the arguments 508// to reflectcallmove. It does not follow the Go ABI; it expects its 509// arguments in registers. 510TEXT callRet<>(SB), NOSPLIT, $32-0 511 NO_LOCAL_POINTERS 512 MOVQ DX, 0(SP) 513 MOVQ DI, 8(SP) 514 MOVQ SI, 16(SP) 515 MOVQ CX, 24(SP) 516 CALL runtime·reflectcallmove(SB) 517 RET 518 519CALLFN(·call32, 32) 520CALLFN(·call64, 64) 521CALLFN(·call128, 128) 522CALLFN(·call256, 256) 523CALLFN(·call512, 512) 524CALLFN(·call1024, 1024) 525CALLFN(·call2048, 2048) 526CALLFN(·call4096, 4096) 527CALLFN(·call8192, 8192) 528CALLFN(·call16384, 16384) 529CALLFN(·call32768, 32768) 530CALLFN(·call65536, 65536) 531CALLFN(·call131072, 131072) 532CALLFN(·call262144, 262144) 533CALLFN(·call524288, 524288) 534CALLFN(·call1048576, 1048576) 535CALLFN(·call2097152, 2097152) 536CALLFN(·call4194304, 4194304) 537CALLFN(·call8388608, 8388608) 538CALLFN(·call16777216, 16777216) 539CALLFN(·call33554432, 33554432) 540CALLFN(·call67108864, 67108864) 541CALLFN(·call134217728, 134217728) 542CALLFN(·call268435456, 268435456) 543CALLFN(·call536870912, 536870912) 544CALLFN(·call1073741824, 1073741824) 545 546TEXT runtime·procyield(SB),NOSPLIT,$0-0 547 MOVL cycles+0(FP), AX 548again: 549 PAUSE 550 SUBL $1, AX 551 JNZ again 552 RET 553 554 555TEXT ·publicationBarrier(SB),NOSPLIT,$0-0 556 // Stores are already ordered on x86, so this is just a 557 // compile barrier. 558 RET 559 560// func jmpdefer(fv *funcval, argp uintptr) 561// argp is a caller SP. 562// called from deferreturn. 563// 1. pop the caller 564// 2. sub 5 bytes from the callers return 565// 3. jmp to the argument 566TEXT runtime·jmpdefer(SB), NOSPLIT, $0-16 567 MOVQ fv+0(FP), DX // fn 568 MOVQ argp+8(FP), BX // caller sp 569 LEAQ -8(BX), SP // caller sp after CALL 570 MOVQ -8(SP), BP // restore BP as if deferreturn returned (harmless if framepointers not in use) 571 SUBQ $5, (SP) // return to CALL again 572 MOVQ 0(DX), BX 573 JMP BX // but first run the deferred function 574 575// Save state of caller into g->sched. Smashes R8, R9. 576TEXT gosave<>(SB),NOSPLIT,$0 577 get_tls(R8) 578 MOVQ g(R8), R8 579 MOVQ 0(SP), R9 580 MOVQ R9, (g_sched+gobuf_pc)(R8) 581 LEAQ 8(SP), R9 582 MOVQ R9, (g_sched+gobuf_sp)(R8) 583 MOVQ $0, (g_sched+gobuf_ret)(R8) 584 MOVQ BP, (g_sched+gobuf_bp)(R8) 585 // Assert ctxt is zero. See func save. 586 MOVQ (g_sched+gobuf_ctxt)(R8), R9 587 TESTQ R9, R9 588 JZ 2(PC) 589 CALL runtime·badctxt(SB) 590 RET 591 592// func asmcgocall(fn, arg unsafe.Pointer) int32 593// Call fn(arg) on the scheduler stack, 594// aligned appropriately for the gcc ABI. 595// See cgocall.go for more details. 596TEXT ·asmcgocall(SB),NOSPLIT,$0-20 597 MOVQ fn+0(FP), AX 598 MOVQ arg+8(FP), BX 599 600 MOVQ SP, DX 601 602 // Figure out if we need to switch to m->g0 stack. 603 // We get called to create new OS threads too, and those 604 // come in on the m->g0 stack already. 605 get_tls(CX) 606 MOVQ g(CX), R8 607 CMPQ R8, $0 608 JEQ nosave 609 MOVQ g_m(R8), R8 610 MOVQ m_g0(R8), SI 611 MOVQ g(CX), DI 612 CMPQ SI, DI 613 JEQ nosave 614 MOVQ m_gsignal(R8), SI 615 CMPQ SI, DI 616 JEQ nosave 617 618 // Switch to system stack. 619 MOVQ m_g0(R8), SI 620 CALL gosave<>(SB) 621 MOVQ SI, g(CX) 622 MOVQ (g_sched+gobuf_sp)(SI), SP 623 624 // Now on a scheduling stack (a pthread-created stack). 625 // Make sure we have enough room for 4 stack-backed fast-call 626 // registers as per windows amd64 calling convention. 627 SUBQ $64, SP 628 ANDQ $~15, SP // alignment for gcc ABI 629 MOVQ DI, 48(SP) // save g 630 MOVQ (g_stack+stack_hi)(DI), DI 631 SUBQ DX, DI 632 MOVQ DI, 40(SP) // save depth in stack (can't just save SP, as stack might be copied during a callback) 633 MOVQ BX, DI // DI = first argument in AMD64 ABI 634 MOVQ BX, CX // CX = first argument in Win64 635 CALL AX 636 637 // Restore registers, g, stack pointer. 638 get_tls(CX) 639 MOVQ 48(SP), DI 640 MOVQ (g_stack+stack_hi)(DI), SI 641 SUBQ 40(SP), SI 642 MOVQ DI, g(CX) 643 MOVQ SI, SP 644 645 MOVL AX, ret+16(FP) 646 RET 647 648nosave: 649 // Running on a system stack, perhaps even without a g. 650 // Having no g can happen during thread creation or thread teardown 651 // (see needm/dropm on Solaris, for example). 652 // This code is like the above sequence but without saving/restoring g 653 // and without worrying about the stack moving out from under us 654 // (because we're on a system stack, not a goroutine stack). 655 // The above code could be used directly if already on a system stack, 656 // but then the only path through this code would be a rare case on Solaris. 657 // Using this code for all "already on system stack" calls exercises it more, 658 // which should help keep it correct. 659 SUBQ $64, SP 660 ANDQ $~15, SP 661 MOVQ $0, 48(SP) // where above code stores g, in case someone looks during debugging 662 MOVQ DX, 40(SP) // save original stack pointer 663 MOVQ BX, DI // DI = first argument in AMD64 ABI 664 MOVQ BX, CX // CX = first argument in Win64 665 CALL AX 666 MOVQ 40(SP), SI // restore original stack pointer 667 MOVQ SI, SP 668 MOVL AX, ret+16(FP) 669 RET 670 671// func cgocallback(fn, frame unsafe.Pointer, framesize, ctxt uintptr) 672// Turn the fn into a Go func (by taking its address) and call 673// cgocallback_gofunc. 674TEXT runtime·cgocallback(SB),NOSPLIT,$32-32 675 LEAQ fn+0(FP), AX 676 MOVQ AX, 0(SP) 677 MOVQ frame+8(FP), AX 678 MOVQ AX, 8(SP) 679 MOVQ framesize+16(FP), AX 680 MOVQ AX, 16(SP) 681 MOVQ ctxt+24(FP), AX 682 MOVQ AX, 24(SP) 683 MOVQ $runtime·cgocallback_gofunc(SB), AX 684 CALL AX 685 RET 686 687// func cgocallback_gofunc(fn, frame, framesize, ctxt uintptr) 688// See cgocall.go for more details. 689TEXT ·cgocallback_gofunc(SB),NOSPLIT,$16-32 690 NO_LOCAL_POINTERS 691 692 // If g is nil, Go did not create the current thread. 693 // Call needm to obtain one m for temporary use. 694 // In this case, we're running on the thread stack, so there's 695 // lots of space, but the linker doesn't know. Hide the call from 696 // the linker analysis by using an indirect call through AX. 697 get_tls(CX) 698#ifdef GOOS_windows 699 MOVL $0, BX 700 CMPQ CX, $0 701 JEQ 2(PC) 702#endif 703 MOVQ g(CX), BX 704 CMPQ BX, $0 705 JEQ needm 706 MOVQ g_m(BX), BX 707 MOVQ BX, R8 // holds oldm until end of function 708 JMP havem 709needm: 710 MOVQ $0, 0(SP) 711 MOVQ $runtime·needm(SB), AX 712 CALL AX 713 MOVQ 0(SP), R8 714 get_tls(CX) 715 MOVQ g(CX), BX 716 MOVQ g_m(BX), BX 717 718 // Set m->sched.sp = SP, so that if a panic happens 719 // during the function we are about to execute, it will 720 // have a valid SP to run on the g0 stack. 721 // The next few lines (after the havem label) 722 // will save this SP onto the stack and then write 723 // the same SP back to m->sched.sp. That seems redundant, 724 // but if an unrecovered panic happens, unwindm will 725 // restore the g->sched.sp from the stack location 726 // and then systemstack will try to use it. If we don't set it here, 727 // that restored SP will be uninitialized (typically 0) and 728 // will not be usable. 729 MOVQ m_g0(BX), SI 730 MOVQ SP, (g_sched+gobuf_sp)(SI) 731 732havem: 733 // Now there's a valid m, and we're running on its m->g0. 734 // Save current m->g0->sched.sp on stack and then set it to SP. 735 // Save current sp in m->g0->sched.sp in preparation for 736 // switch back to m->curg stack. 737 // NOTE: unwindm knows that the saved g->sched.sp is at 0(SP). 738 MOVQ m_g0(BX), SI 739 MOVQ (g_sched+gobuf_sp)(SI), AX 740 MOVQ AX, 0(SP) 741 MOVQ SP, (g_sched+gobuf_sp)(SI) 742 743 // Switch to m->curg stack and call runtime.cgocallbackg. 744 // Because we are taking over the execution of m->curg 745 // but *not* resuming what had been running, we need to 746 // save that information (m->curg->sched) so we can restore it. 747 // We can restore m->curg->sched.sp easily, because calling 748 // runtime.cgocallbackg leaves SP unchanged upon return. 749 // To save m->curg->sched.pc, we push it onto the stack. 750 // This has the added benefit that it looks to the traceback 751 // routine like cgocallbackg is going to return to that 752 // PC (because the frame we allocate below has the same 753 // size as cgocallback_gofunc's frame declared above) 754 // so that the traceback will seamlessly trace back into 755 // the earlier calls. 756 // 757 // In the new goroutine, 8(SP) holds the saved R8. 758 MOVQ m_curg(BX), SI 759 MOVQ SI, g(CX) 760 MOVQ (g_sched+gobuf_sp)(SI), DI // prepare stack as DI 761 MOVQ (g_sched+gobuf_pc)(SI), BX 762 MOVQ BX, -8(DI) 763 // Compute the size of the frame, including return PC and, if 764 // GOEXPERIMENT=framepointer, the saved base pointer 765 MOVQ ctxt+24(FP), BX 766 LEAQ fv+0(FP), AX 767 SUBQ SP, AX 768 SUBQ AX, DI 769 MOVQ DI, SP 770 771 MOVQ R8, 8(SP) 772 MOVQ BX, 0(SP) 773 CALL runtime·cgocallbackg(SB) 774 MOVQ 8(SP), R8 775 776 // Compute the size of the frame again. FP and SP have 777 // completely different values here than they did above, 778 // but only their difference matters. 779 LEAQ fv+0(FP), AX 780 SUBQ SP, AX 781 782 // Restore g->sched (== m->curg->sched) from saved values. 783 get_tls(CX) 784 MOVQ g(CX), SI 785 MOVQ SP, DI 786 ADDQ AX, DI 787 MOVQ -8(DI), BX 788 MOVQ BX, (g_sched+gobuf_pc)(SI) 789 MOVQ DI, (g_sched+gobuf_sp)(SI) 790 791 // Switch back to m->g0's stack and restore m->g0->sched.sp. 792 // (Unlike m->curg, the g0 goroutine never uses sched.pc, 793 // so we do not have to restore it.) 794 MOVQ g(CX), BX 795 MOVQ g_m(BX), BX 796 MOVQ m_g0(BX), SI 797 MOVQ SI, g(CX) 798 MOVQ (g_sched+gobuf_sp)(SI), SP 799 MOVQ 0(SP), AX 800 MOVQ AX, (g_sched+gobuf_sp)(SI) 801 802 // If the m on entry was nil, we called needm above to borrow an m 803 // for the duration of the call. Since the call is over, return it with dropm. 804 CMPQ R8, $0 805 JNE 3(PC) 806 MOVQ $runtime·dropm(SB), AX 807 CALL AX 808 809 // Done! 810 RET 811 812// func setg(gg *g) 813// set g. for use by needm. 814TEXT runtime·setg(SB), NOSPLIT, $0-8 815 MOVQ gg+0(FP), BX 816#ifdef GOOS_windows 817 CMPQ BX, $0 818 JNE settls 819 MOVQ $0, 0x28(GS) 820 RET 821settls: 822 MOVQ g_m(BX), AX 823 LEAQ m_tls(AX), AX 824 MOVQ AX, 0x28(GS) 825#endif 826 get_tls(CX) 827 MOVQ BX, g(CX) 828 RET 829 830// void setg_gcc(G*); set g called from gcc. 831TEXT setg_gcc<>(SB),NOSPLIT,$0 832 get_tls(AX) 833 MOVQ DI, g(AX) 834 RET 835 836TEXT runtime·abort(SB),NOSPLIT,$0-0 837 INT $3 838loop: 839 JMP loop 840 841// check that SP is in range [g->stack.lo, g->stack.hi) 842TEXT runtime·stackcheck(SB), NOSPLIT, $0-0 843 get_tls(CX) 844 MOVQ g(CX), AX 845 CMPQ (g_stack+stack_hi)(AX), SP 846 JHI 2(PC) 847 CALL runtime·abort(SB) 848 CMPQ SP, (g_stack+stack_lo)(AX) 849 JHI 2(PC) 850 CALL runtime·abort(SB) 851 RET 852 853// func cputicks() int64 854TEXT runtime·cputicks(SB),NOSPLIT,$0-0 855 CMPB runtime·lfenceBeforeRdtsc(SB), $1 856 JNE mfence 857 LFENCE 858 JMP done 859mfence: 860 MFENCE 861done: 862 RDTSC 863 SHLQ $32, DX 864 ADDQ DX, AX 865 MOVQ AX, ret+0(FP) 866 RET 867 868// func aeshash(p unsafe.Pointer, h, s uintptr) uintptr 869// hash function using AES hardware instructions 870TEXT runtime·aeshash(SB),NOSPLIT,$0-32 871 MOVQ p+0(FP), AX // ptr to data 872 MOVQ s+16(FP), CX // size 873 LEAQ ret+24(FP), DX 874 JMP runtime·aeshashbody(SB) 875 876// func aeshashstr(p unsafe.Pointer, h uintptr) uintptr 877TEXT runtime·aeshashstr(SB),NOSPLIT,$0-24 878 MOVQ p+0(FP), AX // ptr to string struct 879 MOVQ 8(AX), CX // length of string 880 MOVQ (AX), AX // string data 881 LEAQ ret+16(FP), DX 882 JMP runtime·aeshashbody(SB) 883 884// AX: data 885// CX: length 886// DX: address to put return value 887TEXT runtime·aeshashbody(SB),NOSPLIT,$0-0 888 // Fill an SSE register with our seeds. 889 MOVQ h+8(FP), X0 // 64 bits of per-table hash seed 890 PINSRW $4, CX, X0 // 16 bits of length 891 PSHUFHW $0, X0, X0 // repeat length 4 times total 892 MOVO X0, X1 // save unscrambled seed 893 PXOR runtime·aeskeysched(SB), X0 // xor in per-process seed 894 AESENC X0, X0 // scramble seed 895 896 CMPQ CX, $16 897 JB aes0to15 898 JE aes16 899 CMPQ CX, $32 900 JBE aes17to32 901 CMPQ CX, $64 902 JBE aes33to64 903 CMPQ CX, $128 904 JBE aes65to128 905 JMP aes129plus 906 907aes0to15: 908 TESTQ CX, CX 909 JE aes0 910 911 ADDQ $16, AX 912 TESTW $0xff0, AX 913 JE endofpage 914 915 // 16 bytes loaded at this address won't cross 916 // a page boundary, so we can load it directly. 917 MOVOU -16(AX), X1 918 ADDQ CX, CX 919 MOVQ $masks<>(SB), AX 920 PAND (AX)(CX*8), X1 921final1: 922 PXOR X0, X1 // xor data with seed 923 AESENC X1, X1 // scramble combo 3 times 924 AESENC X1, X1 925 AESENC X1, X1 926 MOVQ X1, (DX) 927 RET 928 929endofpage: 930 // address ends in 1111xxxx. Might be up against 931 // a page boundary, so load ending at last byte. 932 // Then shift bytes down using pshufb. 933 MOVOU -32(AX)(CX*1), X1 934 ADDQ CX, CX 935 MOVQ $shifts<>(SB), AX 936 PSHUFB (AX)(CX*8), X1 937 JMP final1 938 939aes0: 940 // Return scrambled input seed 941 AESENC X0, X0 942 MOVQ X0, (DX) 943 RET 944 945aes16: 946 MOVOU (AX), X1 947 JMP final1 948 949aes17to32: 950 // make second starting seed 951 PXOR runtime·aeskeysched+16(SB), X1 952 AESENC X1, X1 953 954 // load data to be hashed 955 MOVOU (AX), X2 956 MOVOU -16(AX)(CX*1), X3 957 958 // xor with seed 959 PXOR X0, X2 960 PXOR X1, X3 961 962 // scramble 3 times 963 AESENC X2, X2 964 AESENC X3, X3 965 AESENC X2, X2 966 AESENC X3, X3 967 AESENC X2, X2 968 AESENC X3, X3 969 970 // combine results 971 PXOR X3, X2 972 MOVQ X2, (DX) 973 RET 974 975aes33to64: 976 // make 3 more starting seeds 977 MOVO X1, X2 978 MOVO X1, X3 979 PXOR runtime·aeskeysched+16(SB), X1 980 PXOR runtime·aeskeysched+32(SB), X2 981 PXOR runtime·aeskeysched+48(SB), X3 982 AESENC X1, X1 983 AESENC X2, X2 984 AESENC X3, X3 985 986 MOVOU (AX), X4 987 MOVOU 16(AX), X5 988 MOVOU -32(AX)(CX*1), X6 989 MOVOU -16(AX)(CX*1), X7 990 991 PXOR X0, X4 992 PXOR X1, X5 993 PXOR X2, X6 994 PXOR X3, X7 995 996 AESENC X4, X4 997 AESENC X5, X5 998 AESENC X6, X6 999 AESENC X7, X7 1000 1001 AESENC X4, X4 1002 AESENC X5, X5 1003 AESENC X6, X6 1004 AESENC X7, X7 1005 1006 AESENC X4, X4 1007 AESENC X5, X5 1008 AESENC X6, X6 1009 AESENC X7, X7 1010 1011 PXOR X6, X4 1012 PXOR X7, X5 1013 PXOR X5, X4 1014 MOVQ X4, (DX) 1015 RET 1016 1017aes65to128: 1018 // make 7 more starting seeds 1019 MOVO X1, X2 1020 MOVO X1, X3 1021 MOVO X1, X4 1022 MOVO X1, X5 1023 MOVO X1, X6 1024 MOVO X1, X7 1025 PXOR runtime·aeskeysched+16(SB), X1 1026 PXOR runtime·aeskeysched+32(SB), X2 1027 PXOR runtime·aeskeysched+48(SB), X3 1028 PXOR runtime·aeskeysched+64(SB), X4 1029 PXOR runtime·aeskeysched+80(SB), X5 1030 PXOR runtime·aeskeysched+96(SB), X6 1031 PXOR runtime·aeskeysched+112(SB), X7 1032 AESENC X1, X1 1033 AESENC X2, X2 1034 AESENC X3, X3 1035 AESENC X4, X4 1036 AESENC X5, X5 1037 AESENC X6, X6 1038 AESENC X7, X7 1039 1040 // load data 1041 MOVOU (AX), X8 1042 MOVOU 16(AX), X9 1043 MOVOU 32(AX), X10 1044 MOVOU 48(AX), X11 1045 MOVOU -64(AX)(CX*1), X12 1046 MOVOU -48(AX)(CX*1), X13 1047 MOVOU -32(AX)(CX*1), X14 1048 MOVOU -16(AX)(CX*1), X15 1049 1050 // xor with seed 1051 PXOR X0, X8 1052 PXOR X1, X9 1053 PXOR X2, X10 1054 PXOR X3, X11 1055 PXOR X4, X12 1056 PXOR X5, X13 1057 PXOR X6, X14 1058 PXOR X7, X15 1059 1060 // scramble 3 times 1061 AESENC X8, X8 1062 AESENC X9, X9 1063 AESENC X10, X10 1064 AESENC X11, X11 1065 AESENC X12, X12 1066 AESENC X13, X13 1067 AESENC X14, X14 1068 AESENC X15, X15 1069 1070 AESENC X8, X8 1071 AESENC X9, X9 1072 AESENC X10, X10 1073 AESENC X11, X11 1074 AESENC X12, X12 1075 AESENC X13, X13 1076 AESENC X14, X14 1077 AESENC X15, X15 1078 1079 AESENC X8, X8 1080 AESENC X9, X9 1081 AESENC X10, X10 1082 AESENC X11, X11 1083 AESENC X12, X12 1084 AESENC X13, X13 1085 AESENC X14, X14 1086 AESENC X15, X15 1087 1088 // combine results 1089 PXOR X12, X8 1090 PXOR X13, X9 1091 PXOR X14, X10 1092 PXOR X15, X11 1093 PXOR X10, X8 1094 PXOR X11, X9 1095 PXOR X9, X8 1096 MOVQ X8, (DX) 1097 RET 1098 1099aes129plus: 1100 // make 7 more starting seeds 1101 MOVO X1, X2 1102 MOVO X1, X3 1103 MOVO X1, X4 1104 MOVO X1, X5 1105 MOVO X1, X6 1106 MOVO X1, X7 1107 PXOR runtime·aeskeysched+16(SB), X1 1108 PXOR runtime·aeskeysched+32(SB), X2 1109 PXOR runtime·aeskeysched+48(SB), X3 1110 PXOR runtime·aeskeysched+64(SB), X4 1111 PXOR runtime·aeskeysched+80(SB), X5 1112 PXOR runtime·aeskeysched+96(SB), X6 1113 PXOR runtime·aeskeysched+112(SB), X7 1114 AESENC X1, X1 1115 AESENC X2, X2 1116 AESENC X3, X3 1117 AESENC X4, X4 1118 AESENC X5, X5 1119 AESENC X6, X6 1120 AESENC X7, X7 1121 1122 // start with last (possibly overlapping) block 1123 MOVOU -128(AX)(CX*1), X8 1124 MOVOU -112(AX)(CX*1), X9 1125 MOVOU -96(AX)(CX*1), X10 1126 MOVOU -80(AX)(CX*1), X11 1127 MOVOU -64(AX)(CX*1), X12 1128 MOVOU -48(AX)(CX*1), X13 1129 MOVOU -32(AX)(CX*1), X14 1130 MOVOU -16(AX)(CX*1), X15 1131 1132 // xor in seed 1133 PXOR X0, X8 1134 PXOR X1, X9 1135 PXOR X2, X10 1136 PXOR X3, X11 1137 PXOR X4, X12 1138 PXOR X5, X13 1139 PXOR X6, X14 1140 PXOR X7, X15 1141 1142 // compute number of remaining 128-byte blocks 1143 DECQ CX 1144 SHRQ $7, CX 1145 1146aesloop: 1147 // scramble state 1148 AESENC X8, X8 1149 AESENC X9, X9 1150 AESENC X10, X10 1151 AESENC X11, X11 1152 AESENC X12, X12 1153 AESENC X13, X13 1154 AESENC X14, X14 1155 AESENC X15, X15 1156 1157 // scramble state, xor in a block 1158 MOVOU (AX), X0 1159 MOVOU 16(AX), X1 1160 MOVOU 32(AX), X2 1161 MOVOU 48(AX), X3 1162 AESENC X0, X8 1163 AESENC X1, X9 1164 AESENC X2, X10 1165 AESENC X3, X11 1166 MOVOU 64(AX), X4 1167 MOVOU 80(AX), X5 1168 MOVOU 96(AX), X6 1169 MOVOU 112(AX), X7 1170 AESENC X4, X12 1171 AESENC X5, X13 1172 AESENC X6, X14 1173 AESENC X7, X15 1174 1175 ADDQ $128, AX 1176 DECQ CX 1177 JNE aesloop 1178 1179 // 3 more scrambles to finish 1180 AESENC X8, X8 1181 AESENC X9, X9 1182 AESENC X10, X10 1183 AESENC X11, X11 1184 AESENC X12, X12 1185 AESENC X13, X13 1186 AESENC X14, X14 1187 AESENC X15, X15 1188 AESENC X8, X8 1189 AESENC X9, X9 1190 AESENC X10, X10 1191 AESENC X11, X11 1192 AESENC X12, X12 1193 AESENC X13, X13 1194 AESENC X14, X14 1195 AESENC X15, X15 1196 AESENC X8, X8 1197 AESENC X9, X9 1198 AESENC X10, X10 1199 AESENC X11, X11 1200 AESENC X12, X12 1201 AESENC X13, X13 1202 AESENC X14, X14 1203 AESENC X15, X15 1204 1205 PXOR X12, X8 1206 PXOR X13, X9 1207 PXOR X14, X10 1208 PXOR X15, X11 1209 PXOR X10, X8 1210 PXOR X11, X9 1211 PXOR X9, X8 1212 MOVQ X8, (DX) 1213 RET 1214 1215// func aeshash32(p unsafe.Pointer, h uintptr) uintptr 1216TEXT runtime·aeshash32(SB),NOSPLIT,$0-24 1217 MOVQ p+0(FP), AX // ptr to data 1218 MOVQ h+8(FP), X0 // seed 1219 PINSRD $2, (AX), X0 // data 1220 AESENC runtime·aeskeysched+0(SB), X0 1221 AESENC runtime·aeskeysched+16(SB), X0 1222 AESENC runtime·aeskeysched+32(SB), X0 1223 MOVQ X0, ret+16(FP) 1224 RET 1225 1226// func aeshash64(p unsafe.Pointer, h uintptr) uintptr 1227TEXT runtime·aeshash64(SB),NOSPLIT,$0-24 1228 MOVQ p+0(FP), AX // ptr to data 1229 MOVQ h+8(FP), X0 // seed 1230 PINSRQ $1, (AX), X0 // data 1231 AESENC runtime·aeskeysched+0(SB), X0 1232 AESENC runtime·aeskeysched+16(SB), X0 1233 AESENC runtime·aeskeysched+32(SB), X0 1234 MOVQ X0, ret+16(FP) 1235 RET 1236 1237// simple mask to get rid of data in the high part of the register. 1238DATA masks<>+0x00(SB)/8, $0x0000000000000000 1239DATA masks<>+0x08(SB)/8, $0x0000000000000000 1240DATA masks<>+0x10(SB)/8, $0x00000000000000ff 1241DATA masks<>+0x18(SB)/8, $0x0000000000000000 1242DATA masks<>+0x20(SB)/8, $0x000000000000ffff 1243DATA masks<>+0x28(SB)/8, $0x0000000000000000 1244DATA masks<>+0x30(SB)/8, $0x0000000000ffffff 1245DATA masks<>+0x38(SB)/8, $0x0000000000000000 1246DATA masks<>+0x40(SB)/8, $0x00000000ffffffff 1247DATA masks<>+0x48(SB)/8, $0x0000000000000000 1248DATA masks<>+0x50(SB)/8, $0x000000ffffffffff 1249DATA masks<>+0x58(SB)/8, $0x0000000000000000 1250DATA masks<>+0x60(SB)/8, $0x0000ffffffffffff 1251DATA masks<>+0x68(SB)/8, $0x0000000000000000 1252DATA masks<>+0x70(SB)/8, $0x00ffffffffffffff 1253DATA masks<>+0x78(SB)/8, $0x0000000000000000 1254DATA masks<>+0x80(SB)/8, $0xffffffffffffffff 1255DATA masks<>+0x88(SB)/8, $0x0000000000000000 1256DATA masks<>+0x90(SB)/8, $0xffffffffffffffff 1257DATA masks<>+0x98(SB)/8, $0x00000000000000ff 1258DATA masks<>+0xa0(SB)/8, $0xffffffffffffffff 1259DATA masks<>+0xa8(SB)/8, $0x000000000000ffff 1260DATA masks<>+0xb0(SB)/8, $0xffffffffffffffff 1261DATA masks<>+0xb8(SB)/8, $0x0000000000ffffff 1262DATA masks<>+0xc0(SB)/8, $0xffffffffffffffff 1263DATA masks<>+0xc8(SB)/8, $0x00000000ffffffff 1264DATA masks<>+0xd0(SB)/8, $0xffffffffffffffff 1265DATA masks<>+0xd8(SB)/8, $0x000000ffffffffff 1266DATA masks<>+0xe0(SB)/8, $0xffffffffffffffff 1267DATA masks<>+0xe8(SB)/8, $0x0000ffffffffffff 1268DATA masks<>+0xf0(SB)/8, $0xffffffffffffffff 1269DATA masks<>+0xf8(SB)/8, $0x00ffffffffffffff 1270GLOBL masks<>(SB),RODATA,$256 1271 1272// func checkASM() bool 1273TEXT ·checkASM(SB),NOSPLIT,$0-1 1274 // check that masks<>(SB) and shifts<>(SB) are aligned to 16-byte 1275 MOVQ $masks<>(SB), AX 1276 MOVQ $shifts<>(SB), BX 1277 ORQ BX, AX 1278 TESTQ $15, AX 1279 SETEQ ret+0(FP) 1280 RET 1281 1282// these are arguments to pshufb. They move data down from 1283// the high bytes of the register to the low bytes of the register. 1284// index is how many bytes to move. 1285DATA shifts<>+0x00(SB)/8, $0x0000000000000000 1286DATA shifts<>+0x08(SB)/8, $0x0000000000000000 1287DATA shifts<>+0x10(SB)/8, $0xffffffffffffff0f 1288DATA shifts<>+0x18(SB)/8, $0xffffffffffffffff 1289DATA shifts<>+0x20(SB)/8, $0xffffffffffff0f0e 1290DATA shifts<>+0x28(SB)/8, $0xffffffffffffffff 1291DATA shifts<>+0x30(SB)/8, $0xffffffffff0f0e0d 1292DATA shifts<>+0x38(SB)/8, $0xffffffffffffffff 1293DATA shifts<>+0x40(SB)/8, $0xffffffff0f0e0d0c 1294DATA shifts<>+0x48(SB)/8, $0xffffffffffffffff 1295DATA shifts<>+0x50(SB)/8, $0xffffff0f0e0d0c0b 1296DATA shifts<>+0x58(SB)/8, $0xffffffffffffffff 1297DATA shifts<>+0x60(SB)/8, $0xffff0f0e0d0c0b0a 1298DATA shifts<>+0x68(SB)/8, $0xffffffffffffffff 1299DATA shifts<>+0x70(SB)/8, $0xff0f0e0d0c0b0a09 1300DATA shifts<>+0x78(SB)/8, $0xffffffffffffffff 1301DATA shifts<>+0x80(SB)/8, $0x0f0e0d0c0b0a0908 1302DATA shifts<>+0x88(SB)/8, $0xffffffffffffffff 1303DATA shifts<>+0x90(SB)/8, $0x0e0d0c0b0a090807 1304DATA shifts<>+0x98(SB)/8, $0xffffffffffffff0f 1305DATA shifts<>+0xa0(SB)/8, $0x0d0c0b0a09080706 1306DATA shifts<>+0xa8(SB)/8, $0xffffffffffff0f0e 1307DATA shifts<>+0xb0(SB)/8, $0x0c0b0a0908070605 1308DATA shifts<>+0xb8(SB)/8, $0xffffffffff0f0e0d 1309DATA shifts<>+0xc0(SB)/8, $0x0b0a090807060504 1310DATA shifts<>+0xc8(SB)/8, $0xffffffff0f0e0d0c 1311DATA shifts<>+0xd0(SB)/8, $0x0a09080706050403 1312DATA shifts<>+0xd8(SB)/8, $0xffffff0f0e0d0c0b 1313DATA shifts<>+0xe0(SB)/8, $0x0908070605040302 1314DATA shifts<>+0xe8(SB)/8, $0xffff0f0e0d0c0b0a 1315DATA shifts<>+0xf0(SB)/8, $0x0807060504030201 1316DATA shifts<>+0xf8(SB)/8, $0xff0f0e0d0c0b0a09 1317GLOBL shifts<>(SB),RODATA,$256 1318 1319TEXT runtime·return0(SB), NOSPLIT, $0 1320 MOVL $0, AX 1321 RET 1322 1323 1324// Called from cgo wrappers, this function returns g->m->curg.stack.hi. 1325// Must obey the gcc calling convention. 1326TEXT _cgo_topofstack(SB),NOSPLIT,$0 1327 get_tls(CX) 1328 MOVQ g(CX), AX 1329 MOVQ g_m(AX), AX 1330 MOVQ m_curg(AX), AX 1331 MOVQ (g_stack+stack_hi)(AX), AX 1332 RET 1333 1334// The top-most function running on a goroutine 1335// returns to goexit+PCQuantum. 1336TEXT runtime·goexit(SB),NOSPLIT,$0-0 1337 BYTE $0x90 // NOP 1338 CALL runtime·goexit1(SB) // does not return 1339 // traceback from goexit1 must hit code range of goexit 1340 BYTE $0x90 // NOP 1341 1342// This is called from .init_array and follows the platform, not Go, ABI. 1343TEXT runtime·addmoduledata(SB),NOSPLIT,$0-0 1344 PUSHQ R15 // The access to global variables below implicitly uses R15, which is callee-save 1345 MOVQ runtime·lastmoduledatap(SB), AX 1346 MOVQ DI, moduledata_next(AX) 1347 MOVQ DI, runtime·lastmoduledatap(SB) 1348 POPQ R15 1349 RET 1350 1351// gcWriteBarrier performs a heap pointer write and informs the GC. 1352// 1353// gcWriteBarrier does NOT follow the Go ABI. It takes two arguments: 1354// - DI is the destination of the write 1355// - AX is the value being written at DI 1356// It clobbers FLAGS. It does not clobber any general-purpose registers, 1357// but may clobber others (e.g., SSE registers). 1358TEXT runtime·gcWriteBarrier(SB),NOSPLIT,$120 1359 // Save the registers clobbered by the fast path. This is slightly 1360 // faster than having the caller spill these. 1361 MOVQ R14, 104(SP) 1362 MOVQ R13, 112(SP) 1363 // TODO: Consider passing g.m.p in as an argument so they can be shared 1364 // across a sequence of write barriers. 1365 get_tls(R13) 1366 MOVQ g(R13), R13 1367 MOVQ g_m(R13), R13 1368 MOVQ m_p(R13), R13 1369 MOVQ (p_wbBuf+wbBuf_next)(R13), R14 1370 // Increment wbBuf.next position. 1371 LEAQ 16(R14), R14 1372 MOVQ R14, (p_wbBuf+wbBuf_next)(R13) 1373 CMPQ R14, (p_wbBuf+wbBuf_end)(R13) 1374 // Record the write. 1375 MOVQ AX, -16(R14) // Record value 1376 // Note: This turns bad pointer writes into bad 1377 // pointer reads, which could be confusing. We could avoid 1378 // reading from obviously bad pointers, which would 1379 // take care of the vast majority of these. We could 1380 // patch this up in the signal handler, or use XCHG to 1381 // combine the read and the write. 1382 MOVQ (DI), R13 1383 MOVQ R13, -8(R14) // Record *slot 1384 // Is the buffer full? (flags set in CMPQ above) 1385 JEQ flush 1386ret: 1387 MOVQ 104(SP), R14 1388 MOVQ 112(SP), R13 1389 // Do the write. 1390 MOVQ AX, (DI) 1391 RET 1392 1393flush: 1394 // Save all general purpose registers since these could be 1395 // clobbered by wbBufFlush and were not saved by the caller. 1396 // It is possible for wbBufFlush to clobber other registers 1397 // (e.g., SSE registers), but the compiler takes care of saving 1398 // those in the caller if necessary. This strikes a balance 1399 // with registers that are likely to be used. 1400 // 1401 // We don't have type information for these, but all code under 1402 // here is NOSPLIT, so nothing will observe these. 1403 // 1404 // TODO: We could strike a different balance; e.g., saving X0 1405 // and not saving GP registers that are less likely to be used. 1406 MOVQ DI, 0(SP) // Also first argument to wbBufFlush 1407 MOVQ AX, 8(SP) // Also second argument to wbBufFlush 1408 MOVQ BX, 16(SP) 1409 MOVQ CX, 24(SP) 1410 MOVQ DX, 32(SP) 1411 // DI already saved 1412 MOVQ SI, 40(SP) 1413 MOVQ BP, 48(SP) 1414 MOVQ R8, 56(SP) 1415 MOVQ R9, 64(SP) 1416 MOVQ R10, 72(SP) 1417 MOVQ R11, 80(SP) 1418 MOVQ R12, 88(SP) 1419 // R13 already saved 1420 // R14 already saved 1421 MOVQ R15, 96(SP) 1422 1423 // This takes arguments DI and AX 1424 CALL runtime·wbBufFlush(SB) 1425 1426 MOVQ 0(SP), DI 1427 MOVQ 8(SP), AX 1428 MOVQ 16(SP), BX 1429 MOVQ 24(SP), CX 1430 MOVQ 32(SP), DX 1431 MOVQ 40(SP), SI 1432 MOVQ 48(SP), BP 1433 MOVQ 56(SP), R8 1434 MOVQ 64(SP), R9 1435 MOVQ 72(SP), R10 1436 MOVQ 80(SP), R11 1437 MOVQ 88(SP), R12 1438 MOVQ 96(SP), R15 1439 JMP ret 1440 1441DATA debugCallFrameTooLarge<>+0x00(SB)/8, $"call fra" 1442DATA debugCallFrameTooLarge<>+0x08(SB)/8, $"me too l" 1443DATA debugCallFrameTooLarge<>+0x10(SB)/4, $"arge" 1444GLOBL debugCallFrameTooLarge<>(SB), RODATA, $0x14 // Size duplicated below 1445 1446// debugCallV1 is the entry point for debugger-injected function 1447// calls on running goroutines. It informs the runtime that a 1448// debug call has been injected and creates a call frame for the 1449// debugger to fill in. 1450// 1451// To inject a function call, a debugger should: 1452// 1. Check that the goroutine is in state _Grunning and that 1453// there are at least 256 bytes free on the stack. 1454// 2. Push the current PC on the stack (updating SP). 1455// 3. Write the desired argument frame size at SP-16 (using the SP 1456// after step 2). 1457// 4. Save all machine registers (including flags and XMM reigsters) 1458// so they can be restored later by the debugger. 1459// 5. Set the PC to debugCallV1 and resume execution. 1460// 1461// If the goroutine is in state _Grunnable, then it's not generally 1462// safe to inject a call because it may return out via other runtime 1463// operations. Instead, the debugger should unwind the stack to find 1464// the return to non-runtime code, add a temporary breakpoint there, 1465// and inject the call once that breakpoint is hit. 1466// 1467// If the goroutine is in any other state, it's not safe to inject a call. 1468// 1469// This function communicates back to the debugger by setting RAX and 1470// invoking INT3 to raise a breakpoint signal. See the comments in the 1471// implementation for the protocol the debugger is expected to 1472// follow. InjectDebugCall in the runtime tests demonstrates this protocol. 1473// 1474// The debugger must ensure that any pointers passed to the function 1475// obey escape analysis requirements. Specifically, it must not pass 1476// a stack pointer to an escaping argument. debugCallV1 cannot check 1477// this invariant. 1478TEXT runtime·debugCallV1(SB),NOSPLIT,$152-0 1479 // Save all registers that may contain pointers in GC register 1480 // map order (see ssa.registersAMD64). This makes it possible 1481 // to copy the stack while updating pointers currently held in 1482 // registers, and for the GC to find roots in registers. 1483 // 1484 // We can't do anything that might clobber any of these 1485 // registers before this. 1486 MOVQ R15, r15-(14*8+8)(SP) 1487 MOVQ R14, r14-(13*8+8)(SP) 1488 MOVQ R13, r13-(12*8+8)(SP) 1489 MOVQ R12, r12-(11*8+8)(SP) 1490 MOVQ R11, r11-(10*8+8)(SP) 1491 MOVQ R10, r10-(9*8+8)(SP) 1492 MOVQ R9, r9-(8*8+8)(SP) 1493 MOVQ R8, r8-(7*8+8)(SP) 1494 MOVQ DI, di-(6*8+8)(SP) 1495 MOVQ SI, si-(5*8+8)(SP) 1496 MOVQ BP, bp-(4*8+8)(SP) 1497 MOVQ BX, bx-(3*8+8)(SP) 1498 MOVQ DX, dx-(2*8+8)(SP) 1499 // Save the frame size before we clobber it. Either of the last 1500 // saves could clobber this depending on whether there's a saved BP. 1501 MOVQ frameSize-24(FP), DX // aka -16(RSP) before prologue 1502 MOVQ CX, cx-(1*8+8)(SP) 1503 MOVQ AX, ax-(0*8+8)(SP) 1504 1505 // Save the argument frame size. 1506 MOVQ DX, frameSize-128(SP) 1507 1508 // Perform a safe-point check. 1509 MOVQ retpc-8(FP), AX // Caller's PC 1510 MOVQ AX, 0(SP) 1511 CALL runtime·debugCallCheck(SB) 1512 MOVQ 8(SP), AX 1513 TESTQ AX, AX 1514 JZ good 1515 // The safety check failed. Put the reason string at the top 1516 // of the stack. 1517 MOVQ AX, 0(SP) 1518 MOVQ 16(SP), AX 1519 MOVQ AX, 8(SP) 1520 // Set AX to 8 and invoke INT3. The debugger should get the 1521 // reason a call can't be injected from the top of the stack 1522 // and resume execution. 1523 MOVQ $8, AX 1524 BYTE $0xcc 1525 JMP restore 1526 1527good: 1528 // Registers are saved and it's safe to make a call. 1529 // Open up a call frame, moving the stack if necessary. 1530 // 1531 // Once the frame is allocated, this will set AX to 0 and 1532 // invoke INT3. The debugger should write the argument 1533 // frame for the call at SP, push the trapping PC on the 1534 // stack, set the PC to the function to call, set RCX to point 1535 // to the closure (if a closure call), and resume execution. 1536 // 1537 // If the function returns, this will set AX to 1 and invoke 1538 // INT3. The debugger can then inspect any return value saved 1539 // on the stack at SP and resume execution again. 1540 // 1541 // If the function panics, this will set AX to 2 and invoke INT3. 1542 // The interface{} value of the panic will be at SP. The debugger 1543 // can inspect the panic value and resume execution again. 1544#define DEBUG_CALL_DISPATCH(NAME,MAXSIZE) \ 1545 CMPQ AX, $MAXSIZE; \ 1546 JA 5(PC); \ 1547 MOVQ $NAME(SB), AX; \ 1548 MOVQ AX, 0(SP); \ 1549 CALL runtime·debugCallWrap(SB); \ 1550 JMP restore 1551 1552 MOVQ frameSize-128(SP), AX 1553 DEBUG_CALL_DISPATCH(debugCall32<>, 32) 1554 DEBUG_CALL_DISPATCH(debugCall64<>, 64) 1555 DEBUG_CALL_DISPATCH(debugCall128<>, 128) 1556 DEBUG_CALL_DISPATCH(debugCall256<>, 256) 1557 DEBUG_CALL_DISPATCH(debugCall512<>, 512) 1558 DEBUG_CALL_DISPATCH(debugCall1024<>, 1024) 1559 DEBUG_CALL_DISPATCH(debugCall2048<>, 2048) 1560 DEBUG_CALL_DISPATCH(debugCall4096<>, 4096) 1561 DEBUG_CALL_DISPATCH(debugCall8192<>, 8192) 1562 DEBUG_CALL_DISPATCH(debugCall16384<>, 16384) 1563 DEBUG_CALL_DISPATCH(debugCall32768<>, 32768) 1564 DEBUG_CALL_DISPATCH(debugCall65536<>, 65536) 1565 // The frame size is too large. Report the error. 1566 MOVQ $debugCallFrameTooLarge<>(SB), AX 1567 MOVQ AX, 0(SP) 1568 MOVQ $0x14, 8(SP) 1569 MOVQ $8, AX 1570 BYTE $0xcc 1571 JMP restore 1572 1573restore: 1574 // Calls and failures resume here. 1575 // 1576 // Set AX to 16 and invoke INT3. The debugger should restore 1577 // all registers except RIP and RSP and resume execution. 1578 MOVQ $16, AX 1579 BYTE $0xcc 1580 // We must not modify flags after this point. 1581 1582 // Restore pointer-containing registers, which may have been 1583 // modified from the debugger's copy by stack copying. 1584 MOVQ ax-(0*8+8)(SP), AX 1585 MOVQ cx-(1*8+8)(SP), CX 1586 MOVQ dx-(2*8+8)(SP), DX 1587 MOVQ bx-(3*8+8)(SP), BX 1588 MOVQ bp-(4*8+8)(SP), BP 1589 MOVQ si-(5*8+8)(SP), SI 1590 MOVQ di-(6*8+8)(SP), DI 1591 MOVQ r8-(7*8+8)(SP), R8 1592 MOVQ r9-(8*8+8)(SP), R9 1593 MOVQ r10-(9*8+8)(SP), R10 1594 MOVQ r11-(10*8+8)(SP), R11 1595 MOVQ r12-(11*8+8)(SP), R12 1596 MOVQ r13-(12*8+8)(SP), R13 1597 MOVQ r14-(13*8+8)(SP), R14 1598 MOVQ r15-(14*8+8)(SP), R15 1599 1600 RET 1601 1602#define DEBUG_CALL_FN(NAME,MAXSIZE) \ 1603TEXT NAME(SB),WRAPPER,$MAXSIZE-0; \ 1604 NO_LOCAL_POINTERS; \ 1605 MOVQ $0, AX; \ 1606 BYTE $0xcc; \ 1607 MOVQ $1, AX; \ 1608 BYTE $0xcc; \ 1609 RET 1610DEBUG_CALL_FN(debugCall32<>, 32) 1611DEBUG_CALL_FN(debugCall64<>, 64) 1612DEBUG_CALL_FN(debugCall128<>, 128) 1613DEBUG_CALL_FN(debugCall256<>, 256) 1614DEBUG_CALL_FN(debugCall512<>, 512) 1615DEBUG_CALL_FN(debugCall1024<>, 1024) 1616DEBUG_CALL_FN(debugCall2048<>, 2048) 1617DEBUG_CALL_FN(debugCall4096<>, 4096) 1618DEBUG_CALL_FN(debugCall8192<>, 8192) 1619DEBUG_CALL_FN(debugCall16384<>, 16384) 1620DEBUG_CALL_FN(debugCall32768<>, 32768) 1621DEBUG_CALL_FN(debugCall65536<>, 65536) 1622 1623// func debugCallPanicked(val interface{}) 1624TEXT runtime·debugCallPanicked(SB),NOSPLIT,$16-16 1625 // Copy the panic value to the top of stack. 1626 MOVQ val_type+0(FP), AX 1627 MOVQ AX, 0(SP) 1628 MOVQ val_data+8(FP), AX 1629 MOVQ AX, 8(SP) 1630 MOVQ $2, AX 1631 BYTE $0xcc 1632 RET
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