Text file
src/runtime/asm_amd64.s
Documentation: runtime
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
87// Defined as ABIInternal since it does not use the stack-based Go ABI (and
88// in addition there are no calls to this entry point from Go code).
89TEXT runtime·rt0_go<ABIInternal>(SB),NOSPLIT,$0
90 // copy arguments forward on an even stack
91 MOVQ DI, AX // argc
92 MOVQ SI, BX // argv
93 SUBQ $(4*8+7), SP // 2args 2auto
94 ANDQ $~15, SP
95 MOVQ AX, 16(SP)
96 MOVQ BX, 24(SP)
97
98 // create istack out of the given (operating system) stack.
99 // _cgo_init may update stackguard.
100 MOVQ $runtime·g0(SB), DI
101 LEAQ (-64*1024+104)(SP), BX
102 MOVQ BX, g_stackguard0(DI)
103 MOVQ BX, g_stackguard1(DI)
104 MOVQ BX, (g_stack+stack_lo)(DI)
105 MOVQ SP, (g_stack+stack_hi)(DI)
106
107 // find out information about the processor we're on
108 MOVL $0, AX
109 CPUID
110 MOVL AX, SI
111 CMPL AX, $0
112 JE nocpuinfo
113
114 // Figure out how to serialize RDTSC.
115 // On Intel processors LFENCE is enough. AMD requires MFENCE.
116 // Don't know about the rest, so let's do MFENCE.
117 CMPL BX, $0x756E6547 // "Genu"
118 JNE notintel
119 CMPL DX, $0x49656E69 // "ineI"
120 JNE notintel
121 CMPL CX, $0x6C65746E // "ntel"
122 JNE notintel
123 MOVB $1, runtime·isIntel(SB)
124 MOVB $1, runtime·lfenceBeforeRdtsc(SB)
125notintel:
126
127 // Load EAX=1 cpuid flags
128 MOVL $1, AX
129 CPUID
130 MOVL AX, runtime·processorVersionInfo(SB)
131
132nocpuinfo:
133 // if there is an _cgo_init, call it.
134 MOVQ _cgo_init(SB), AX
135 TESTQ AX, AX
136 JZ needtls
137 // arg 1: g0, already in DI
138 MOVQ $setg_gcc<>(SB), SI // arg 2: setg_gcc
139#ifdef GOOS_android
140 MOVQ $runtime·tls_g(SB), DX // arg 3: &tls_g
141 // arg 4: TLS base, stored in slot 0 (Android's TLS_SLOT_SELF).
142 // Compensate for tls_g (+16).
143 MOVQ -16(TLS), CX
144#else
145 MOVQ $0, DX // arg 3, 4: not used when using platform's TLS
146 MOVQ $0, CX
147#endif
148#ifdef GOOS_windows
149 // Adjust for the Win64 calling convention.
150 MOVQ CX, R9 // arg 4
151 MOVQ DX, R8 // arg 3
152 MOVQ SI, DX // arg 2
153 MOVQ DI, CX // arg 1
154#endif
155 CALL AX
156
157 // update stackguard after _cgo_init
158 MOVQ $runtime·g0(SB), CX
159 MOVQ (g_stack+stack_lo)(CX), AX
160 ADDQ $const__StackGuard, AX
161 MOVQ AX, g_stackguard0(CX)
162 MOVQ AX, g_stackguard1(CX)
163
164#ifndef GOOS_windows
165 JMP ok
166#endif
167needtls:
168#ifdef GOOS_plan9
169 // skip TLS setup on Plan 9
170 JMP ok
171#endif
172#ifdef GOOS_solaris
173 // skip TLS setup on Solaris
174 JMP ok
175#endif
176#ifdef GOOS_illumos
177 // skip TLS setup on illumos
178 JMP ok
179#endif
180#ifdef GOOS_darwin
181 // skip TLS setup on Darwin
182 JMP ok
183#endif
184#ifdef GOOS_openbsd
185 // skip TLS setup on OpenBSD
186 JMP ok
187#endif
188
189 LEAQ runtime·m0+m_tls(SB), DI
190 CALL runtime·settls(SB)
191
192 // store through it, to make sure it works
193 get_tls(BX)
194 MOVQ $0x123, g(BX)
195 MOVQ runtime·m0+m_tls(SB), AX
196 CMPQ AX, $0x123
197 JEQ 2(PC)
198 CALL runtime·abort(SB)
199ok:
200 // set the per-goroutine and per-mach "registers"
201 get_tls(BX)
202 LEAQ runtime·g0(SB), CX
203 MOVQ CX, g(BX)
204 LEAQ runtime·m0(SB), AX
205
206 // save m->g0 = g0
207 MOVQ CX, m_g0(AX)
208 // save m0 to g0->m
209 MOVQ AX, g_m(CX)
210
211 CLD // convention is D is always left cleared
212 CALL runtime·check(SB)
213
214 MOVL 16(SP), AX // copy argc
215 MOVL AX, 0(SP)
216 MOVQ 24(SP), AX // copy argv
217 MOVQ AX, 8(SP)
218 CALL runtime·args(SB)
219 CALL runtime·osinit(SB)
220 CALL runtime·schedinit(SB)
221
222 // create a new goroutine to start program
223 MOVQ $runtime·mainPC(SB), AX // entry
224 PUSHQ AX
225 PUSHQ $0 // arg size
226 CALL runtime·newproc(SB)
227 POPQ AX
228 POPQ AX
229
230 // start this M
231 CALL runtime·mstart(SB)
232
233 CALL runtime·abort(SB) // mstart should never return
234 RET
235
236 // Prevent dead-code elimination of debugCallV1, which is
237 // intended to be called by debuggers.
238 MOVQ $runtime·debugCallV1<ABIInternal>(SB), AX
239 RET
240
241// mainPC is a function value for runtime.main, to be passed to newproc.
242// The reference to runtime.main is made via ABIInternal, since the
243// actual function (not the ABI0 wrapper) is needed by newproc.
244DATA runtime·mainPC+0(SB)/8,$runtime·main<ABIInternal>(SB)
245GLOBL runtime·mainPC(SB),RODATA,$8
246
247TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
248 BYTE $0xcc
249 RET
250
251TEXT runtime·asminit(SB),NOSPLIT,$0-0
252 // No per-thread init.
253 RET
254
255/*
256 * go-routine
257 */
258
259// func gosave(buf *gobuf)
260// save state in Gobuf; setjmp
261TEXT runtime·gosave(SB), NOSPLIT, $0-8
262 MOVQ buf+0(FP), AX // gobuf
263 LEAQ buf+0(FP), BX // caller's SP
264 MOVQ BX, gobuf_sp(AX)
265 MOVQ 0(SP), BX // caller's PC
266 MOVQ BX, gobuf_pc(AX)
267 MOVQ $0, gobuf_ret(AX)
268 MOVQ BP, gobuf_bp(AX)
269 // Assert ctxt is zero. See func save.
270 MOVQ gobuf_ctxt(AX), BX
271 TESTQ BX, BX
272 JZ 2(PC)
273 CALL runtime·badctxt(SB)
274 get_tls(CX)
275 MOVQ g(CX), BX
276 MOVQ BX, gobuf_g(AX)
277 RET
278
279// func gogo(buf *gobuf)
280// restore state from Gobuf; longjmp
281TEXT runtime·gogo(SB), NOSPLIT, $16-8
282 MOVQ buf+0(FP), BX // gobuf
283 MOVQ gobuf_g(BX), DX
284 MOVQ 0(DX), CX // make sure g != nil
285 get_tls(CX)
286 MOVQ DX, g(CX)
287 MOVQ gobuf_sp(BX), SP // restore SP
288 MOVQ gobuf_ret(BX), AX
289 MOVQ gobuf_ctxt(BX), DX
290 MOVQ gobuf_bp(BX), BP
291 MOVQ $0, gobuf_sp(BX) // clear to help garbage collector
292 MOVQ $0, gobuf_ret(BX)
293 MOVQ $0, gobuf_ctxt(BX)
294 MOVQ $0, gobuf_bp(BX)
295 MOVQ gobuf_pc(BX), BX
296 JMP BX
297
298// func mcall(fn func(*g))
299// Switch to m->g0's stack, call fn(g).
300// Fn must never return. It should gogo(&g->sched)
301// to keep running g.
302TEXT runtime·mcall(SB), NOSPLIT, $0-8
303 MOVQ fn+0(FP), DI
304
305 get_tls(CX)
306 MOVQ g(CX), AX // save state in g->sched
307 MOVQ 0(SP), BX // caller's PC
308 MOVQ BX, (g_sched+gobuf_pc)(AX)
309 LEAQ fn+0(FP), BX // caller's SP
310 MOVQ BX, (g_sched+gobuf_sp)(AX)
311 MOVQ AX, (g_sched+gobuf_g)(AX)
312 MOVQ BP, (g_sched+gobuf_bp)(AX)
313
314 // switch to m->g0 & its stack, call fn
315 MOVQ g(CX), BX
316 MOVQ g_m(BX), BX
317 MOVQ m_g0(BX), SI
318 CMPQ SI, AX // if g == m->g0 call badmcall
319 JNE 3(PC)
320 MOVQ $runtime·badmcall(SB), AX
321 JMP AX
322 MOVQ SI, g(CX) // g = m->g0
323 MOVQ (g_sched+gobuf_sp)(SI), SP // sp = m->g0->sched.sp
324 PUSHQ AX
325 MOVQ DI, DX
326 MOVQ 0(DI), DI
327 CALL DI
328 POPQ AX
329 MOVQ $runtime·badmcall2(SB), AX
330 JMP AX
331 RET
332
333// systemstack_switch is a dummy routine that systemstack leaves at the bottom
334// of the G stack. We need to distinguish the routine that
335// lives at the bottom of the G stack from the one that lives
336// at the top of the system stack because the one at the top of
337// the system stack terminates the stack walk (see topofstack()).
338TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0
339 RET
340
341// func systemstack(fn func())
342TEXT runtime·systemstack(SB), NOSPLIT, $0-8
343 MOVQ fn+0(FP), DI // DI = fn
344 get_tls(CX)
345 MOVQ g(CX), AX // AX = g
346 MOVQ g_m(AX), BX // BX = m
347
348 CMPQ AX, m_gsignal(BX)
349 JEQ noswitch
350
351 MOVQ m_g0(BX), DX // DX = g0
352 CMPQ AX, DX
353 JEQ noswitch
354
355 CMPQ AX, m_curg(BX)
356 JNE bad
357
358 // switch stacks
359 // save our state in g->sched. Pretend to
360 // be systemstack_switch if the G stack is scanned.
361 MOVQ $runtime·systemstack_switch(SB), SI
362 MOVQ SI, (g_sched+gobuf_pc)(AX)
363 MOVQ SP, (g_sched+gobuf_sp)(AX)
364 MOVQ AX, (g_sched+gobuf_g)(AX)
365 MOVQ BP, (g_sched+gobuf_bp)(AX)
366
367 // switch to g0
368 MOVQ DX, g(CX)
369 MOVQ (g_sched+gobuf_sp)(DX), BX
370 // make it look like mstart called systemstack on g0, to stop traceback
371 SUBQ $8, BX
372 MOVQ $runtime·mstart(SB), DX
373 MOVQ DX, 0(BX)
374 MOVQ BX, SP
375
376 // call target function
377 MOVQ DI, DX
378 MOVQ 0(DI), DI
379 CALL DI
380
381 // switch back to g
382 get_tls(CX)
383 MOVQ g(CX), AX
384 MOVQ g_m(AX), BX
385 MOVQ m_curg(BX), AX
386 MOVQ AX, g(CX)
387 MOVQ (g_sched+gobuf_sp)(AX), SP
388 MOVQ $0, (g_sched+gobuf_sp)(AX)
389 RET
390
391noswitch:
392 // already on m stack; tail call the function
393 // Using a tail call here cleans up tracebacks since we won't stop
394 // at an intermediate systemstack.
395 MOVQ DI, DX
396 MOVQ 0(DI), DI
397 JMP DI
398
399bad:
400 // Bad: g is not gsignal, not g0, not curg. What is it?
401 MOVQ $runtime·badsystemstack(SB), AX
402 CALL AX
403 INT $3
404
405
406/*
407 * support for morestack
408 */
409
410// Called during function prolog when more stack is needed.
411//
412// The traceback routines see morestack on a g0 as being
413// the top of a stack (for example, morestack calling newstack
414// calling the scheduler calling newm calling gc), so we must
415// record an argument size. For that purpose, it has no arguments.
416TEXT runtime·morestack(SB),NOSPLIT,$0-0
417 // Cannot grow scheduler stack (m->g0).
418 get_tls(CX)
419 MOVQ g(CX), BX
420 MOVQ g_m(BX), BX
421 MOVQ m_g0(BX), SI
422 CMPQ g(CX), SI
423 JNE 3(PC)
424 CALL runtime·badmorestackg0(SB)
425 CALL runtime·abort(SB)
426
427 // Cannot grow signal stack (m->gsignal).
428 MOVQ m_gsignal(BX), SI
429 CMPQ g(CX), SI
430 JNE 3(PC)
431 CALL runtime·badmorestackgsignal(SB)
432 CALL runtime·abort(SB)
433
434 // Called from f.
435 // Set m->morebuf to f's caller.
436 NOP SP // tell vet SP changed - stop checking offsets
437 MOVQ 8(SP), AX // f's caller's PC
438 MOVQ AX, (m_morebuf+gobuf_pc)(BX)
439 LEAQ 16(SP), AX // f's caller's SP
440 MOVQ AX, (m_morebuf+gobuf_sp)(BX)
441 get_tls(CX)
442 MOVQ g(CX), SI
443 MOVQ SI, (m_morebuf+gobuf_g)(BX)
444
445 // Set g->sched to context in f.
446 MOVQ 0(SP), AX // f's PC
447 MOVQ AX, (g_sched+gobuf_pc)(SI)
448 MOVQ SI, (g_sched+gobuf_g)(SI)
449 LEAQ 8(SP), AX // f's SP
450 MOVQ AX, (g_sched+gobuf_sp)(SI)
451 MOVQ BP, (g_sched+gobuf_bp)(SI)
452 MOVQ DX, (g_sched+gobuf_ctxt)(SI)
453
454 // Call newstack on m->g0's stack.
455 MOVQ m_g0(BX), BX
456 MOVQ BX, g(CX)
457 MOVQ (g_sched+gobuf_sp)(BX), SP
458 CALL runtime·newstack(SB)
459 CALL runtime·abort(SB) // crash if newstack returns
460 RET
461
462// morestack but not preserving ctxt.
463TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0
464 MOVL $0, DX
465 JMP runtime·morestack(SB)
466
467// reflectcall: call a function with the given argument list
468// func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32).
469// we don't have variable-sized frames, so we use a small number
470// of constant-sized-frame functions to encode a few bits of size in the pc.
471// Caution: ugly multiline assembly macros in your future!
472
473#define DISPATCH(NAME,MAXSIZE) \
474 CMPQ CX, $MAXSIZE; \
475 JA 3(PC); \
476 MOVQ $NAME(SB), AX; \
477 JMP AX
478// Note: can't just "JMP NAME(SB)" - bad inlining results.
479
480TEXT ·reflectcall<ABIInternal>(SB), NOSPLIT, $0-32
481 MOVLQZX argsize+24(FP), CX
482 DISPATCH(runtime·call16, 16)
483 DISPATCH(runtime·call32, 32)
484 DISPATCH(runtime·call64, 64)
485 DISPATCH(runtime·call128, 128)
486 DISPATCH(runtime·call256, 256)
487 DISPATCH(runtime·call512, 512)
488 DISPATCH(runtime·call1024, 1024)
489 DISPATCH(runtime·call2048, 2048)
490 DISPATCH(runtime·call4096, 4096)
491 DISPATCH(runtime·call8192, 8192)
492 DISPATCH(runtime·call16384, 16384)
493 DISPATCH(runtime·call32768, 32768)
494 DISPATCH(runtime·call65536, 65536)
495 DISPATCH(runtime·call131072, 131072)
496 DISPATCH(runtime·call262144, 262144)
497 DISPATCH(runtime·call524288, 524288)
498 DISPATCH(runtime·call1048576, 1048576)
499 DISPATCH(runtime·call2097152, 2097152)
500 DISPATCH(runtime·call4194304, 4194304)
501 DISPATCH(runtime·call8388608, 8388608)
502 DISPATCH(runtime·call16777216, 16777216)
503 DISPATCH(runtime·call33554432, 33554432)
504 DISPATCH(runtime·call67108864, 67108864)
505 DISPATCH(runtime·call134217728, 134217728)
506 DISPATCH(runtime·call268435456, 268435456)
507 DISPATCH(runtime·call536870912, 536870912)
508 DISPATCH(runtime·call1073741824, 1073741824)
509 MOVQ $runtime·badreflectcall(SB), AX
510 JMP AX
511
512#define CALLFN(NAME,MAXSIZE) \
513TEXT NAME(SB), WRAPPER, $MAXSIZE-32; \
514 NO_LOCAL_POINTERS; \
515 /* copy arguments to stack */ \
516 MOVQ argptr+16(FP), SI; \
517 MOVLQZX argsize+24(FP), CX; \
518 MOVQ SP, DI; \
519 REP;MOVSB; \
520 /* call function */ \
521 MOVQ f+8(FP), DX; \
522 PCDATA $PCDATA_StackMapIndex, $0; \
523 MOVQ (DX), AX; \
524 CALL AX; \
525 /* copy return values back */ \
526 MOVQ argtype+0(FP), DX; \
527 MOVQ argptr+16(FP), DI; \
528 MOVLQZX argsize+24(FP), CX; \
529 MOVLQZX retoffset+28(FP), BX; \
530 MOVQ SP, SI; \
531 ADDQ BX, DI; \
532 ADDQ BX, SI; \
533 SUBQ BX, CX; \
534 CALL callRet<>(SB); \
535 RET
536
537// callRet copies return values back at the end of call*. This is a
538// separate function so it can allocate stack space for the arguments
539// to reflectcallmove. It does not follow the Go ABI; it expects its
540// arguments in registers.
541TEXT callRet<>(SB), NOSPLIT, $32-0
542 NO_LOCAL_POINTERS
543 MOVQ DX, 0(SP)
544 MOVQ DI, 8(SP)
545 MOVQ SI, 16(SP)
546 MOVQ CX, 24(SP)
547 CALL runtime·reflectcallmove(SB)
548 RET
549
550CALLFN(·call16, 16)
551CALLFN(·call32, 32)
552CALLFN(·call64, 64)
553CALLFN(·call128, 128)
554CALLFN(·call256, 256)
555CALLFN(·call512, 512)
556CALLFN(·call1024, 1024)
557CALLFN(·call2048, 2048)
558CALLFN(·call4096, 4096)
559CALLFN(·call8192, 8192)
560CALLFN(·call16384, 16384)
561CALLFN(·call32768, 32768)
562CALLFN(·call65536, 65536)
563CALLFN(·call131072, 131072)
564CALLFN(·call262144, 262144)
565CALLFN(·call524288, 524288)
566CALLFN(·call1048576, 1048576)
567CALLFN(·call2097152, 2097152)
568CALLFN(·call4194304, 4194304)
569CALLFN(·call8388608, 8388608)
570CALLFN(·call16777216, 16777216)
571CALLFN(·call33554432, 33554432)
572CALLFN(·call67108864, 67108864)
573CALLFN(·call134217728, 134217728)
574CALLFN(·call268435456, 268435456)
575CALLFN(·call536870912, 536870912)
576CALLFN(·call1073741824, 1073741824)
577
578TEXT runtime·procyield(SB),NOSPLIT,$0-0
579 MOVL cycles+0(FP), AX
580again:
581 PAUSE
582 SUBL $1, AX
583 JNZ again
584 RET
585
586
587TEXT ·publicationBarrier(SB),NOSPLIT,$0-0
588 // Stores are already ordered on x86, so this is just a
589 // compile barrier.
590 RET
591
592// func jmpdefer(fv *funcval, argp uintptr)
593// argp is a caller SP.
594// called from deferreturn.
595// 1. pop the caller
596// 2. sub 5 bytes from the callers return
597// 3. jmp to the argument
598TEXT runtime·jmpdefer(SB), NOSPLIT, $0-16
599 MOVQ fv+0(FP), DX // fn
600 MOVQ argp+8(FP), BX // caller sp
601 LEAQ -8(BX), SP // caller sp after CALL
602 MOVQ -8(SP), BP // restore BP as if deferreturn returned (harmless if framepointers not in use)
603 SUBQ $5, (SP) // return to CALL again
604 MOVQ 0(DX), BX
605 JMP BX // but first run the deferred function
606
607// Save state of caller into g->sched. Smashes R8, R9.
608TEXT gosave<>(SB),NOSPLIT,$0
609 get_tls(R8)
610 MOVQ g(R8), R8
611 MOVQ 0(SP), R9
612 MOVQ R9, (g_sched+gobuf_pc)(R8)
613 LEAQ 8(SP), R9
614 MOVQ R9, (g_sched+gobuf_sp)(R8)
615 MOVQ $0, (g_sched+gobuf_ret)(R8)
616 MOVQ BP, (g_sched+gobuf_bp)(R8)
617 // Assert ctxt is zero. See func save.
618 MOVQ (g_sched+gobuf_ctxt)(R8), R9
619 TESTQ R9, R9
620 JZ 2(PC)
621 CALL runtime·badctxt(SB)
622 RET
623
624// func asmcgocall(fn, arg unsafe.Pointer) int32
625// Call fn(arg) on the scheduler stack,
626// aligned appropriately for the gcc ABI.
627// See cgocall.go for more details.
628TEXT ·asmcgocall(SB),NOSPLIT,$0-20
629 MOVQ fn+0(FP), AX
630 MOVQ arg+8(FP), BX
631
632 MOVQ SP, DX
633
634 // Figure out if we need to switch to m->g0 stack.
635 // We get called to create new OS threads too, and those
636 // come in on the m->g0 stack already.
637 get_tls(CX)
638 MOVQ g(CX), R8
639 CMPQ R8, $0
640 JEQ nosave
641 MOVQ g_m(R8), R8
642 MOVQ m_g0(R8), SI
643 MOVQ g(CX), DI
644 CMPQ SI, DI
645 JEQ nosave
646 MOVQ m_gsignal(R8), SI
647 CMPQ SI, DI
648 JEQ nosave
649
650 // Switch to system stack.
651 MOVQ m_g0(R8), SI
652 CALL gosave<>(SB)
653 MOVQ SI, g(CX)
654 MOVQ (g_sched+gobuf_sp)(SI), SP
655
656 // Now on a scheduling stack (a pthread-created stack).
657 // Make sure we have enough room for 4 stack-backed fast-call
658 // registers as per windows amd64 calling convention.
659 SUBQ $64, SP
660 ANDQ $~15, SP // alignment for gcc ABI
661 MOVQ DI, 48(SP) // save g
662 MOVQ (g_stack+stack_hi)(DI), DI
663 SUBQ DX, DI
664 MOVQ DI, 40(SP) // save depth in stack (can't just save SP, as stack might be copied during a callback)
665 MOVQ BX, DI // DI = first argument in AMD64 ABI
666 MOVQ BX, CX // CX = first argument in Win64
667 CALL AX
668
669 // Restore registers, g, stack pointer.
670 get_tls(CX)
671 MOVQ 48(SP), DI
672 MOVQ (g_stack+stack_hi)(DI), SI
673 SUBQ 40(SP), SI
674 MOVQ DI, g(CX)
675 MOVQ SI, SP
676
677 MOVL AX, ret+16(FP)
678 RET
679
680nosave:
681 // Running on a system stack, perhaps even without a g.
682 // Having no g can happen during thread creation or thread teardown
683 // (see needm/dropm on Solaris, for example).
684 // This code is like the above sequence but without saving/restoring g
685 // and without worrying about the stack moving out from under us
686 // (because we're on a system stack, not a goroutine stack).
687 // The above code could be used directly if already on a system stack,
688 // but then the only path through this code would be a rare case on Solaris.
689 // Using this code for all "already on system stack" calls exercises it more,
690 // which should help keep it correct.
691 SUBQ $64, SP
692 ANDQ $~15, SP
693 MOVQ $0, 48(SP) // where above code stores g, in case someone looks during debugging
694 MOVQ DX, 40(SP) // save original stack pointer
695 MOVQ BX, DI // DI = first argument in AMD64 ABI
696 MOVQ BX, CX // CX = first argument in Win64
697 CALL AX
698 MOVQ 40(SP), SI // restore original stack pointer
699 MOVQ SI, SP
700 MOVL AX, ret+16(FP)
701 RET
702
703// func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
704// See cgocall.go for more details.
705TEXT ·cgocallback(SB),NOSPLIT,$24-24
706 NO_LOCAL_POINTERS
707
708 // If g is nil, Go did not create the current thread.
709 // Call needm to obtain one m for temporary use.
710 // In this case, we're running on the thread stack, so there's
711 // lots of space, but the linker doesn't know. Hide the call from
712 // the linker analysis by using an indirect call through AX.
713 get_tls(CX)
714#ifdef GOOS_windows
715 MOVL $0, BX
716 CMPQ CX, $0
717 JEQ 2(PC)
718#endif
719 MOVQ g(CX), BX
720 CMPQ BX, $0
721 JEQ needm
722 MOVQ g_m(BX), BX
723 MOVQ BX, savedm-8(SP) // saved copy of oldm
724 JMP havem
725needm:
726 MOVQ $runtime·needm(SB), AX
727 CALL AX
728 MOVQ $0, savedm-8(SP) // dropm on return
729 get_tls(CX)
730 MOVQ g(CX), BX
731 MOVQ g_m(BX), BX
732
733 // Set m->sched.sp = SP, so that if a panic happens
734 // during the function we are about to execute, it will
735 // have a valid SP to run on the g0 stack.
736 // The next few lines (after the havem label)
737 // will save this SP onto the stack and then write
738 // the same SP back to m->sched.sp. That seems redundant,
739 // but if an unrecovered panic happens, unwindm will
740 // restore the g->sched.sp from the stack location
741 // and then systemstack will try to use it. If we don't set it here,
742 // that restored SP will be uninitialized (typically 0) and
743 // will not be usable.
744 MOVQ m_g0(BX), SI
745 MOVQ SP, (g_sched+gobuf_sp)(SI)
746
747havem:
748 // Now there's a valid m, and we're running on its m->g0.
749 // Save current m->g0->sched.sp on stack and then set it to SP.
750 // Save current sp in m->g0->sched.sp in preparation for
751 // switch back to m->curg stack.
752 // NOTE: unwindm knows that the saved g->sched.sp is at 0(SP).
753 MOVQ m_g0(BX), SI
754 MOVQ (g_sched+gobuf_sp)(SI), AX
755 MOVQ AX, 0(SP)
756 MOVQ SP, (g_sched+gobuf_sp)(SI)
757
758 // Switch to m->curg stack and call runtime.cgocallbackg.
759 // Because we are taking over the execution of m->curg
760 // but *not* resuming what had been running, we need to
761 // save that information (m->curg->sched) so we can restore it.
762 // We can restore m->curg->sched.sp easily, because calling
763 // runtime.cgocallbackg leaves SP unchanged upon return.
764 // To save m->curg->sched.pc, we push it onto the curg stack and
765 // open a frame the same size as cgocallback's g0 frame.
766 // Once we switch to the curg stack, the pushed PC will appear
767 // to be the return PC of cgocallback, so that the traceback
768 // will seamlessly trace back into the earlier calls.
769 MOVQ m_curg(BX), SI
770 MOVQ SI, g(CX)
771 MOVQ (g_sched+gobuf_sp)(SI), DI // prepare stack as DI
772 MOVQ (g_sched+gobuf_pc)(SI), BX
773 MOVQ BX, -8(DI) // "push" return PC on the g stack
774 // Gather our arguments into registers.
775 MOVQ fn+0(FP), BX
776 MOVQ frame+8(FP), CX
777 MOVQ ctxt+16(FP), DX
778 // Compute the size of the frame, including return PC and, if
779 // GOEXPERIMENT=framepointer, the saved base pointer
780 LEAQ fn+0(FP), AX
781 SUBQ SP, AX // AX is our actual frame size
782 SUBQ AX, DI // Allocate the same frame size on the g stack
783 MOVQ DI, SP
784
785 MOVQ BX, 0(SP)
786 MOVQ CX, 8(SP)
787 MOVQ DX, 16(SP)
788 CALL runtime·cgocallbackg(SB)
789
790 // Compute the size of the frame again. FP and SP have
791 // completely different values here than they did above,
792 // but only their difference matters.
793 LEAQ fn+0(FP), AX
794 SUBQ SP, AX
795
796 // Restore g->sched (== m->curg->sched) from saved values.
797 get_tls(CX)
798 MOVQ g(CX), SI
799 MOVQ SP, DI
800 ADDQ AX, DI
801 MOVQ -8(DI), BX
802 MOVQ BX, (g_sched+gobuf_pc)(SI)
803 MOVQ DI, (g_sched+gobuf_sp)(SI)
804
805 // Switch back to m->g0's stack and restore m->g0->sched.sp.
806 // (Unlike m->curg, the g0 goroutine never uses sched.pc,
807 // so we do not have to restore it.)
808 MOVQ g(CX), BX
809 MOVQ g_m(BX), BX
810 MOVQ m_g0(BX), SI
811 MOVQ SI, g(CX)
812 MOVQ (g_sched+gobuf_sp)(SI), SP
813 MOVQ 0(SP), AX
814 MOVQ AX, (g_sched+gobuf_sp)(SI)
815
816 // If the m on entry was nil, we called needm above to borrow an m
817 // for the duration of the call. Since the call is over, return it with dropm.
818 MOVQ savedm-8(SP), BX
819 CMPQ BX, $0
820 JNE 3(PC)
821 MOVQ $runtime·dropm(SB), AX
822 CALL AX
823
824 // Done!
825 RET
826
827// func setg(gg *g)
828// set g. for use by needm.
829TEXT runtime·setg(SB), NOSPLIT, $0-8
830 MOVQ gg+0(FP), BX
831#ifdef GOOS_windows
832 CMPQ BX, $0
833 JNE settls
834 MOVQ $0, 0x28(GS)
835 RET
836settls:
837 MOVQ g_m(BX), AX
838 LEAQ m_tls(AX), AX
839 MOVQ AX, 0x28(GS)
840#endif
841 get_tls(CX)
842 MOVQ BX, g(CX)
843 RET
844
845// void setg_gcc(G*); set g called from gcc.
846TEXT setg_gcc<>(SB),NOSPLIT,$0
847 get_tls(AX)
848 MOVQ DI, g(AX)
849 RET
850
851TEXT runtime·abort(SB),NOSPLIT,$0-0
852 INT $3
853loop:
854 JMP loop
855
856// check that SP is in range [g->stack.lo, g->stack.hi)
857TEXT runtime·stackcheck(SB), NOSPLIT, $0-0
858 get_tls(CX)
859 MOVQ g(CX), AX
860 CMPQ (g_stack+stack_hi)(AX), SP
861 JHI 2(PC)
862 CALL runtime·abort(SB)
863 CMPQ SP, (g_stack+stack_lo)(AX)
864 JHI 2(PC)
865 CALL runtime·abort(SB)
866 RET
867
868// func cputicks() int64
869TEXT runtime·cputicks(SB),NOSPLIT,$0-0
870 CMPB runtime·lfenceBeforeRdtsc(SB), $1
871 JNE mfence
872 LFENCE
873 JMP done
874mfence:
875 MFENCE
876done:
877 RDTSC
878 SHLQ $32, DX
879 ADDQ DX, AX
880 MOVQ AX, ret+0(FP)
881 RET
882
883// func memhash(p unsafe.Pointer, h, s uintptr) uintptr
884// hash function using AES hardware instructions
885TEXT runtime·memhash(SB),NOSPLIT,$0-32
886 CMPB runtime·useAeshash(SB), $0
887 JEQ noaes
888 MOVQ p+0(FP), AX // ptr to data
889 MOVQ s+16(FP), CX // size
890 LEAQ ret+24(FP), DX
891 JMP aeshashbody<>(SB)
892noaes:
893 JMP runtime·memhashFallback(SB)
894
895// func strhash(p unsafe.Pointer, h uintptr) uintptr
896TEXT runtime·strhash(SB),NOSPLIT,$0-24
897 CMPB runtime·useAeshash(SB), $0
898 JEQ noaes
899 MOVQ p+0(FP), AX // ptr to string struct
900 MOVQ 8(AX), CX // length of string
901 MOVQ (AX), AX // string data
902 LEAQ ret+16(FP), DX
903 JMP aeshashbody<>(SB)
904noaes:
905 JMP runtime·strhashFallback(SB)
906
907// AX: data
908// CX: length
909// DX: address to put return value
910TEXT aeshashbody<>(SB),NOSPLIT,$0-0
911 // Fill an SSE register with our seeds.
912 MOVQ h+8(FP), X0 // 64 bits of per-table hash seed
913 PINSRW $4, CX, X0 // 16 bits of length
914 PSHUFHW $0, X0, X0 // repeat length 4 times total
915 MOVO X0, X1 // save unscrambled seed
916 PXOR runtime·aeskeysched(SB), X0 // xor in per-process seed
917 AESENC X0, X0 // scramble seed
918
919 CMPQ CX, $16
920 JB aes0to15
921 JE aes16
922 CMPQ CX, $32
923 JBE aes17to32
924 CMPQ CX, $64
925 JBE aes33to64
926 CMPQ CX, $128
927 JBE aes65to128
928 JMP aes129plus
929
930aes0to15:
931 TESTQ CX, CX
932 JE aes0
933
934 ADDQ $16, AX
935 TESTW $0xff0, AX
936 JE endofpage
937
938 // 16 bytes loaded at this address won't cross
939 // a page boundary, so we can load it directly.
940 MOVOU -16(AX), X1
941 ADDQ CX, CX
942 MOVQ $masks<>(SB), AX
943 PAND (AX)(CX*8), X1
944final1:
945 PXOR X0, X1 // xor data with seed
946 AESENC X1, X1 // scramble combo 3 times
947 AESENC X1, X1
948 AESENC X1, X1
949 MOVQ X1, (DX)
950 RET
951
952endofpage:
953 // address ends in 1111xxxx. Might be up against
954 // a page boundary, so load ending at last byte.
955 // Then shift bytes down using pshufb.
956 MOVOU -32(AX)(CX*1), X1
957 ADDQ CX, CX
958 MOVQ $shifts<>(SB), AX
959 PSHUFB (AX)(CX*8), X1
960 JMP final1
961
962aes0:
963 // Return scrambled input seed
964 AESENC X0, X0
965 MOVQ X0, (DX)
966 RET
967
968aes16:
969 MOVOU (AX), X1
970 JMP final1
971
972aes17to32:
973 // make second starting seed
974 PXOR runtime·aeskeysched+16(SB), X1
975 AESENC X1, X1
976
977 // load data to be hashed
978 MOVOU (AX), X2
979 MOVOU -16(AX)(CX*1), X3
980
981 // xor with seed
982 PXOR X0, X2
983 PXOR X1, X3
984
985 // scramble 3 times
986 AESENC X2, X2
987 AESENC X3, X3
988 AESENC X2, X2
989 AESENC X3, X3
990 AESENC X2, X2
991 AESENC X3, X3
992
993 // combine results
994 PXOR X3, X2
995 MOVQ X2, (DX)
996 RET
997
998aes33to64:
999 // make 3 more starting seeds
1000 MOVO X1, X2
1001 MOVO X1, X3
1002 PXOR runtime·aeskeysched+16(SB), X1
1003 PXOR runtime·aeskeysched+32(SB), X2
1004 PXOR runtime·aeskeysched+48(SB), X3
1005 AESENC X1, X1
1006 AESENC X2, X2
1007 AESENC X3, X3
1008
1009 MOVOU (AX), X4
1010 MOVOU 16(AX), X5
1011 MOVOU -32(AX)(CX*1), X6
1012 MOVOU -16(AX)(CX*1), X7
1013
1014 PXOR X0, X4
1015 PXOR X1, X5
1016 PXOR X2, X6
1017 PXOR X3, X7
1018
1019 AESENC X4, X4
1020 AESENC X5, X5
1021 AESENC X6, X6
1022 AESENC X7, X7
1023
1024 AESENC X4, X4
1025 AESENC X5, X5
1026 AESENC X6, X6
1027 AESENC X7, X7
1028
1029 AESENC X4, X4
1030 AESENC X5, X5
1031 AESENC X6, X6
1032 AESENC X7, X7
1033
1034 PXOR X6, X4
1035 PXOR X7, X5
1036 PXOR X5, X4
1037 MOVQ X4, (DX)
1038 RET
1039
1040aes65to128:
1041 // make 7 more starting seeds
1042 MOVO X1, X2
1043 MOVO X1, X3
1044 MOVO X1, X4
1045 MOVO X1, X5
1046 MOVO X1, X6
1047 MOVO X1, X7
1048 PXOR runtime·aeskeysched+16(SB), X1
1049 PXOR runtime·aeskeysched+32(SB), X2
1050 PXOR runtime·aeskeysched+48(SB), X3
1051 PXOR runtime·aeskeysched+64(SB), X4
1052 PXOR runtime·aeskeysched+80(SB), X5
1053 PXOR runtime·aeskeysched+96(SB), X6
1054 PXOR runtime·aeskeysched+112(SB), X7
1055 AESENC X1, X1
1056 AESENC X2, X2
1057 AESENC X3, X3
1058 AESENC X4, X4
1059 AESENC X5, X5
1060 AESENC X6, X6
1061 AESENC X7, X7
1062
1063 // load data
1064 MOVOU (AX), X8
1065 MOVOU 16(AX), X9
1066 MOVOU 32(AX), X10
1067 MOVOU 48(AX), X11
1068 MOVOU -64(AX)(CX*1), X12
1069 MOVOU -48(AX)(CX*1), X13
1070 MOVOU -32(AX)(CX*1), X14
1071 MOVOU -16(AX)(CX*1), X15
1072
1073 // xor with seed
1074 PXOR X0, X8
1075 PXOR X1, X9
1076 PXOR X2, X10
1077 PXOR X3, X11
1078 PXOR X4, X12
1079 PXOR X5, X13
1080 PXOR X6, X14
1081 PXOR X7, X15
1082
1083 // scramble 3 times
1084 AESENC X8, X8
1085 AESENC X9, X9
1086 AESENC X10, X10
1087 AESENC X11, X11
1088 AESENC X12, X12
1089 AESENC X13, X13
1090 AESENC X14, X14
1091 AESENC X15, X15
1092
1093 AESENC X8, X8
1094 AESENC X9, X9
1095 AESENC X10, X10
1096 AESENC X11, X11
1097 AESENC X12, X12
1098 AESENC X13, X13
1099 AESENC X14, X14
1100 AESENC X15, X15
1101
1102 AESENC X8, X8
1103 AESENC X9, X9
1104 AESENC X10, X10
1105 AESENC X11, X11
1106 AESENC X12, X12
1107 AESENC X13, X13
1108 AESENC X14, X14
1109 AESENC X15, X15
1110
1111 // combine results
1112 PXOR X12, X8
1113 PXOR X13, X9
1114 PXOR X14, X10
1115 PXOR X15, X11
1116 PXOR X10, X8
1117 PXOR X11, X9
1118 PXOR X9, X8
1119 MOVQ X8, (DX)
1120 RET
1121
1122aes129plus:
1123 // make 7 more starting seeds
1124 MOVO X1, X2
1125 MOVO X1, X3
1126 MOVO X1, X4
1127 MOVO X1, X5
1128 MOVO X1, X6
1129 MOVO X1, X7
1130 PXOR runtime·aeskeysched+16(SB), X1
1131 PXOR runtime·aeskeysched+32(SB), X2
1132 PXOR runtime·aeskeysched+48(SB), X3
1133 PXOR runtime·aeskeysched+64(SB), X4
1134 PXOR runtime·aeskeysched+80(SB), X5
1135 PXOR runtime·aeskeysched+96(SB), X6
1136 PXOR runtime·aeskeysched+112(SB), X7
1137 AESENC X1, X1
1138 AESENC X2, X2
1139 AESENC X3, X3
1140 AESENC X4, X4
1141 AESENC X5, X5
1142 AESENC X6, X6
1143 AESENC X7, X7
1144
1145 // start with last (possibly overlapping) block
1146 MOVOU -128(AX)(CX*1), X8
1147 MOVOU -112(AX)(CX*1), X9
1148 MOVOU -96(AX)(CX*1), X10
1149 MOVOU -80(AX)(CX*1), X11
1150 MOVOU -64(AX)(CX*1), X12
1151 MOVOU -48(AX)(CX*1), X13
1152 MOVOU -32(AX)(CX*1), X14
1153 MOVOU -16(AX)(CX*1), X15
1154
1155 // xor in seed
1156 PXOR X0, X8
1157 PXOR X1, X9
1158 PXOR X2, X10
1159 PXOR X3, X11
1160 PXOR X4, X12
1161 PXOR X5, X13
1162 PXOR X6, X14
1163 PXOR X7, X15
1164
1165 // compute number of remaining 128-byte blocks
1166 DECQ CX
1167 SHRQ $7, CX
1168
1169aesloop:
1170 // scramble state
1171 AESENC X8, X8
1172 AESENC X9, X9
1173 AESENC X10, X10
1174 AESENC X11, X11
1175 AESENC X12, X12
1176 AESENC X13, X13
1177 AESENC X14, X14
1178 AESENC X15, X15
1179
1180 // scramble state, xor in a block
1181 MOVOU (AX), X0
1182 MOVOU 16(AX), X1
1183 MOVOU 32(AX), X2
1184 MOVOU 48(AX), X3
1185 AESENC X0, X8
1186 AESENC X1, X9
1187 AESENC X2, X10
1188 AESENC X3, X11
1189 MOVOU 64(AX), X4
1190 MOVOU 80(AX), X5
1191 MOVOU 96(AX), X6
1192 MOVOU 112(AX), X7
1193 AESENC X4, X12
1194 AESENC X5, X13
1195 AESENC X6, X14
1196 AESENC X7, X15
1197
1198 ADDQ $128, AX
1199 DECQ CX
1200 JNE aesloop
1201
1202 // 3 more scrambles to finish
1203 AESENC X8, X8
1204 AESENC X9, X9
1205 AESENC X10, X10
1206 AESENC X11, X11
1207 AESENC X12, X12
1208 AESENC X13, X13
1209 AESENC X14, X14
1210 AESENC X15, X15
1211 AESENC X8, X8
1212 AESENC X9, X9
1213 AESENC X10, X10
1214 AESENC X11, X11
1215 AESENC X12, X12
1216 AESENC X13, X13
1217 AESENC X14, X14
1218 AESENC X15, X15
1219 AESENC X8, X8
1220 AESENC X9, X9
1221 AESENC X10, X10
1222 AESENC X11, X11
1223 AESENC X12, X12
1224 AESENC X13, X13
1225 AESENC X14, X14
1226 AESENC X15, X15
1227
1228 PXOR X12, X8
1229 PXOR X13, X9
1230 PXOR X14, X10
1231 PXOR X15, X11
1232 PXOR X10, X8
1233 PXOR X11, X9
1234 PXOR X9, X8
1235 MOVQ X8, (DX)
1236 RET
1237
1238// func memhash32(p unsafe.Pointer, h uintptr) uintptr
1239TEXT runtime·memhash32(SB),NOSPLIT,$0-24
1240 CMPB runtime·useAeshash(SB), $0
1241 JEQ noaes
1242 MOVQ p+0(FP), AX // ptr to data
1243 MOVQ h+8(FP), X0 // seed
1244 PINSRD $2, (AX), X0 // data
1245 AESENC runtime·aeskeysched+0(SB), X0
1246 AESENC runtime·aeskeysched+16(SB), X0
1247 AESENC runtime·aeskeysched+32(SB), X0
1248 MOVQ X0, ret+16(FP)
1249 RET
1250noaes:
1251 JMP runtime·memhash32Fallback(SB)
1252
1253// func memhash64(p unsafe.Pointer, h uintptr) uintptr
1254TEXT runtime·memhash64(SB),NOSPLIT,$0-24
1255 CMPB runtime·useAeshash(SB), $0
1256 JEQ noaes
1257 MOVQ p+0(FP), AX // ptr to data
1258 MOVQ h+8(FP), X0 // seed
1259 PINSRQ $1, (AX), X0 // data
1260 AESENC runtime·aeskeysched+0(SB), X0
1261 AESENC runtime·aeskeysched+16(SB), X0
1262 AESENC runtime·aeskeysched+32(SB), X0
1263 MOVQ X0, ret+16(FP)
1264 RET
1265noaes:
1266 JMP runtime·memhash64Fallback(SB)
1267
1268// simple mask to get rid of data in the high part of the register.
1269DATA masks<>+0x00(SB)/8, $0x0000000000000000
1270DATA masks<>+0x08(SB)/8, $0x0000000000000000
1271DATA masks<>+0x10(SB)/8, $0x00000000000000ff
1272DATA masks<>+0x18(SB)/8, $0x0000000000000000
1273DATA masks<>+0x20(SB)/8, $0x000000000000ffff
1274DATA masks<>+0x28(SB)/8, $0x0000000000000000
1275DATA masks<>+0x30(SB)/8, $0x0000000000ffffff
1276DATA masks<>+0x38(SB)/8, $0x0000000000000000
1277DATA masks<>+0x40(SB)/8, $0x00000000ffffffff
1278DATA masks<>+0x48(SB)/8, $0x0000000000000000
1279DATA masks<>+0x50(SB)/8, $0x000000ffffffffff
1280DATA masks<>+0x58(SB)/8, $0x0000000000000000
1281DATA masks<>+0x60(SB)/8, $0x0000ffffffffffff
1282DATA masks<>+0x68(SB)/8, $0x0000000000000000
1283DATA masks<>+0x70(SB)/8, $0x00ffffffffffffff
1284DATA masks<>+0x78(SB)/8, $0x0000000000000000
1285DATA masks<>+0x80(SB)/8, $0xffffffffffffffff
1286DATA masks<>+0x88(SB)/8, $0x0000000000000000
1287DATA masks<>+0x90(SB)/8, $0xffffffffffffffff
1288DATA masks<>+0x98(SB)/8, $0x00000000000000ff
1289DATA masks<>+0xa0(SB)/8, $0xffffffffffffffff
1290DATA masks<>+0xa8(SB)/8, $0x000000000000ffff
1291DATA masks<>+0xb0(SB)/8, $0xffffffffffffffff
1292DATA masks<>+0xb8(SB)/8, $0x0000000000ffffff
1293DATA masks<>+0xc0(SB)/8, $0xffffffffffffffff
1294DATA masks<>+0xc8(SB)/8, $0x00000000ffffffff
1295DATA masks<>+0xd0(SB)/8, $0xffffffffffffffff
1296DATA masks<>+0xd8(SB)/8, $0x000000ffffffffff
1297DATA masks<>+0xe0(SB)/8, $0xffffffffffffffff
1298DATA masks<>+0xe8(SB)/8, $0x0000ffffffffffff
1299DATA masks<>+0xf0(SB)/8, $0xffffffffffffffff
1300DATA masks<>+0xf8(SB)/8, $0x00ffffffffffffff
1301GLOBL masks<>(SB),RODATA,$256
1302
1303// func checkASM() bool
1304TEXT ·checkASM(SB),NOSPLIT,$0-1
1305 // check that masks<>(SB) and shifts<>(SB) are aligned to 16-byte
1306 MOVQ $masks<>(SB), AX
1307 MOVQ $shifts<>(SB), BX
1308 ORQ BX, AX
1309 TESTQ $15, AX
1310 SETEQ ret+0(FP)
1311 RET
1312
1313// these are arguments to pshufb. They move data down from
1314// the high bytes of the register to the low bytes of the register.
1315// index is how many bytes to move.
1316DATA shifts<>+0x00(SB)/8, $0x0000000000000000
1317DATA shifts<>+0x08(SB)/8, $0x0000000000000000
1318DATA shifts<>+0x10(SB)/8, $0xffffffffffffff0f
1319DATA shifts<>+0x18(SB)/8, $0xffffffffffffffff
1320DATA shifts<>+0x20(SB)/8, $0xffffffffffff0f0e
1321DATA shifts<>+0x28(SB)/8, $0xffffffffffffffff
1322DATA shifts<>+0x30(SB)/8, $0xffffffffff0f0e0d
1323DATA shifts<>+0x38(SB)/8, $0xffffffffffffffff
1324DATA shifts<>+0x40(SB)/8, $0xffffffff0f0e0d0c
1325DATA shifts<>+0x48(SB)/8, $0xffffffffffffffff
1326DATA shifts<>+0x50(SB)/8, $0xffffff0f0e0d0c0b
1327DATA shifts<>+0x58(SB)/8, $0xffffffffffffffff
1328DATA shifts<>+0x60(SB)/8, $0xffff0f0e0d0c0b0a
1329DATA shifts<>+0x68(SB)/8, $0xffffffffffffffff
1330DATA shifts<>+0x70(SB)/8, $0xff0f0e0d0c0b0a09
1331DATA shifts<>+0x78(SB)/8, $0xffffffffffffffff
1332DATA shifts<>+0x80(SB)/8, $0x0f0e0d0c0b0a0908
1333DATA shifts<>+0x88(SB)/8, $0xffffffffffffffff
1334DATA shifts<>+0x90(SB)/8, $0x0e0d0c0b0a090807
1335DATA shifts<>+0x98(SB)/8, $0xffffffffffffff0f
1336DATA shifts<>+0xa0(SB)/8, $0x0d0c0b0a09080706
1337DATA shifts<>+0xa8(SB)/8, $0xffffffffffff0f0e
1338DATA shifts<>+0xb0(SB)/8, $0x0c0b0a0908070605
1339DATA shifts<>+0xb8(SB)/8, $0xffffffffff0f0e0d
1340DATA shifts<>+0xc0(SB)/8, $0x0b0a090807060504
1341DATA shifts<>+0xc8(SB)/8, $0xffffffff0f0e0d0c
1342DATA shifts<>+0xd0(SB)/8, $0x0a09080706050403
1343DATA shifts<>+0xd8(SB)/8, $0xffffff0f0e0d0c0b
1344DATA shifts<>+0xe0(SB)/8, $0x0908070605040302
1345DATA shifts<>+0xe8(SB)/8, $0xffff0f0e0d0c0b0a
1346DATA shifts<>+0xf0(SB)/8, $0x0807060504030201
1347DATA shifts<>+0xf8(SB)/8, $0xff0f0e0d0c0b0a09
1348GLOBL shifts<>(SB),RODATA,$256
1349
1350TEXT runtime·return0(SB), NOSPLIT, $0
1351 MOVL $0, AX
1352 RET
1353
1354
1355// Called from cgo wrappers, this function returns g->m->curg.stack.hi.
1356// Must obey the gcc calling convention.
1357TEXT _cgo_topofstack(SB),NOSPLIT,$0
1358 get_tls(CX)
1359 MOVQ g(CX), AX
1360 MOVQ g_m(AX), AX
1361 MOVQ m_curg(AX), AX
1362 MOVQ (g_stack+stack_hi)(AX), AX
1363 RET
1364
1365// The top-most function running on a goroutine
1366// returns to goexit+PCQuantum. Defined as ABIInternal
1367// so as to make it identifiable to traceback (this
1368// function it used as a sentinel; traceback wants to
1369// see the func PC, not a wrapper PC).
1370TEXT runtime·goexit<ABIInternal>(SB),NOSPLIT,$0-0
1371 BYTE $0x90 // NOP
1372 CALL runtime·goexit1(SB) // does not return
1373 // traceback from goexit1 must hit code range of goexit
1374 BYTE $0x90 // NOP
1375
1376// This is called from .init_array and follows the platform, not Go, ABI.
1377TEXT runtime·addmoduledata(SB),NOSPLIT,$0-0
1378 PUSHQ R15 // The access to global variables below implicitly uses R15, which is callee-save
1379 MOVQ runtime·lastmoduledatap(SB), AX
1380 MOVQ DI, moduledata_next(AX)
1381 MOVQ DI, runtime·lastmoduledatap(SB)
1382 POPQ R15
1383 RET
1384
1385// gcWriteBarrier performs a heap pointer write and informs the GC.
1386//
1387// gcWriteBarrier does NOT follow the Go ABI. It takes two arguments:
1388// - DI is the destination of the write
1389// - AX is the value being written at DI
1390// It clobbers FLAGS. It does not clobber any general-purpose registers,
1391// but may clobber others (e.g., SSE registers).
1392// Defined as ABIInternal since it does not use the stack-based Go ABI.
1393TEXT runtime·gcWriteBarrier<ABIInternal>(SB),NOSPLIT,$120
1394 // Save the registers clobbered by the fast path. This is slightly
1395 // faster than having the caller spill these.
1396 MOVQ R14, 104(SP)
1397 MOVQ R13, 112(SP)
1398 // TODO: Consider passing g.m.p in as an argument so they can be shared
1399 // across a sequence of write barriers.
1400 get_tls(R13)
1401 MOVQ g(R13), R13
1402 MOVQ g_m(R13), R13
1403 MOVQ m_p(R13), R13
1404 MOVQ (p_wbBuf+wbBuf_next)(R13), R14
1405 // Increment wbBuf.next position.
1406 LEAQ 16(R14), R14
1407 MOVQ R14, (p_wbBuf+wbBuf_next)(R13)
1408 CMPQ R14, (p_wbBuf+wbBuf_end)(R13)
1409 // Record the write.
1410 MOVQ AX, -16(R14) // Record value
1411 // Note: This turns bad pointer writes into bad
1412 // pointer reads, which could be confusing. We could avoid
1413 // reading from obviously bad pointers, which would
1414 // take care of the vast majority of these. We could
1415 // patch this up in the signal handler, or use XCHG to
1416 // combine the read and the write.
1417 MOVQ (DI), R13
1418 MOVQ R13, -8(R14) // Record *slot
1419 // Is the buffer full? (flags set in CMPQ above)
1420 JEQ flush
1421ret:
1422 MOVQ 104(SP), R14
1423 MOVQ 112(SP), R13
1424 // Do the write.
1425 MOVQ AX, (DI)
1426 RET
1427
1428flush:
1429 // Save all general purpose registers since these could be
1430 // clobbered by wbBufFlush and were not saved by the caller.
1431 // It is possible for wbBufFlush to clobber other registers
1432 // (e.g., SSE registers), but the compiler takes care of saving
1433 // those in the caller if necessary. This strikes a balance
1434 // with registers that are likely to be used.
1435 //
1436 // We don't have type information for these, but all code under
1437 // here is NOSPLIT, so nothing will observe these.
1438 //
1439 // TODO: We could strike a different balance; e.g., saving X0
1440 // and not saving GP registers that are less likely to be used.
1441 MOVQ DI, 0(SP) // Also first argument to wbBufFlush
1442 MOVQ AX, 8(SP) // Also second argument to wbBufFlush
1443 MOVQ BX, 16(SP)
1444 MOVQ CX, 24(SP)
1445 MOVQ DX, 32(SP)
1446 // DI already saved
1447 MOVQ SI, 40(SP)
1448 MOVQ BP, 48(SP)
1449 MOVQ R8, 56(SP)
1450 MOVQ R9, 64(SP)
1451 MOVQ R10, 72(SP)
1452 MOVQ R11, 80(SP)
1453 MOVQ R12, 88(SP)
1454 // R13 already saved
1455 // R14 already saved
1456 MOVQ R15, 96(SP)
1457
1458 // This takes arguments DI and AX
1459 CALL runtime·wbBufFlush(SB)
1460
1461 MOVQ 0(SP), DI
1462 MOVQ 8(SP), AX
1463 MOVQ 16(SP), BX
1464 MOVQ 24(SP), CX
1465 MOVQ 32(SP), DX
1466 MOVQ 40(SP), SI
1467 MOVQ 48(SP), BP
1468 MOVQ 56(SP), R8
1469 MOVQ 64(SP), R9
1470 MOVQ 72(SP), R10
1471 MOVQ 80(SP), R11
1472 MOVQ 88(SP), R12
1473 MOVQ 96(SP), R15
1474 JMP ret
1475
1476// gcWriteBarrierCX is gcWriteBarrier, but with args in DI and CX.
1477// Defined as ABIInternal since it does not use the stable Go ABI.
1478TEXT runtime·gcWriteBarrierCX<ABIInternal>(SB),NOSPLIT,$0
1479 XCHGQ CX, AX
1480 CALL runtime·gcWriteBarrier<ABIInternal>(SB)
1481 XCHGQ CX, AX
1482 RET
1483
1484// gcWriteBarrierDX is gcWriteBarrier, but with args in DI and DX.
1485// Defined as ABIInternal since it does not use the stable Go ABI.
1486TEXT runtime·gcWriteBarrierDX<ABIInternal>(SB),NOSPLIT,$0
1487 XCHGQ DX, AX
1488 CALL runtime·gcWriteBarrier<ABIInternal>(SB)
1489 XCHGQ DX, AX
1490 RET
1491
1492// gcWriteBarrierBX is gcWriteBarrier, but with args in DI and BX.
1493// Defined as ABIInternal since it does not use the stable Go ABI.
1494TEXT runtime·gcWriteBarrierBX<ABIInternal>(SB),NOSPLIT,$0
1495 XCHGQ BX, AX
1496 CALL runtime·gcWriteBarrier<ABIInternal>(SB)
1497 XCHGQ BX, AX
1498 RET
1499
1500// gcWriteBarrierBP is gcWriteBarrier, but with args in DI and BP.
1501// Defined as ABIInternal since it does not use the stable Go ABI.
1502TEXT runtime·gcWriteBarrierBP<ABIInternal>(SB),NOSPLIT,$0
1503 XCHGQ BP, AX
1504 CALL runtime·gcWriteBarrier<ABIInternal>(SB)
1505 XCHGQ BP, AX
1506 RET
1507
1508// gcWriteBarrierSI is gcWriteBarrier, but with args in DI and SI.
1509// Defined as ABIInternal since it does not use the stable Go ABI.
1510TEXT runtime·gcWriteBarrierSI<ABIInternal>(SB),NOSPLIT,$0
1511 XCHGQ SI, AX
1512 CALL runtime·gcWriteBarrier<ABIInternal>(SB)
1513 XCHGQ SI, AX
1514 RET
1515
1516// gcWriteBarrierR8 is gcWriteBarrier, but with args in DI and R8.
1517// Defined as ABIInternal since it does not use the stable Go ABI.
1518TEXT runtime·gcWriteBarrierR8<ABIInternal>(SB),NOSPLIT,$0
1519 XCHGQ R8, AX
1520 CALL runtime·gcWriteBarrier<ABIInternal>(SB)
1521 XCHGQ R8, AX
1522 RET
1523
1524// gcWriteBarrierR9 is gcWriteBarrier, but with args in DI and R9.
1525// Defined as ABIInternal since it does not use the stable Go ABI.
1526TEXT runtime·gcWriteBarrierR9<ABIInternal>(SB),NOSPLIT,$0
1527 XCHGQ R9, AX
1528 CALL runtime·gcWriteBarrier<ABIInternal>(SB)
1529 XCHGQ R9, AX
1530 RET
1531
1532DATA debugCallFrameTooLarge<>+0x00(SB)/20, $"call frame too large"
1533GLOBL debugCallFrameTooLarge<>(SB), RODATA, $20 // Size duplicated below
1534
1535// debugCallV1 is the entry point for debugger-injected function
1536// calls on running goroutines. It informs the runtime that a
1537// debug call has been injected and creates a call frame for the
1538// debugger to fill in.
1539//
1540// To inject a function call, a debugger should:
1541// 1. Check that the goroutine is in state _Grunning and that
1542// there are at least 256 bytes free on the stack.
1543// 2. Push the current PC on the stack (updating SP).
1544// 3. Write the desired argument frame size at SP-16 (using the SP
1545// after step 2).
1546// 4. Save all machine registers (including flags and XMM reigsters)
1547// so they can be restored later by the debugger.
1548// 5. Set the PC to debugCallV1 and resume execution.
1549//
1550// If the goroutine is in state _Grunnable, then it's not generally
1551// safe to inject a call because it may return out via other runtime
1552// operations. Instead, the debugger should unwind the stack to find
1553// the return to non-runtime code, add a temporary breakpoint there,
1554// and inject the call once that breakpoint is hit.
1555//
1556// If the goroutine is in any other state, it's not safe to inject a call.
1557//
1558// This function communicates back to the debugger by setting RAX and
1559// invoking INT3 to raise a breakpoint signal. See the comments in the
1560// implementation for the protocol the debugger is expected to
1561// follow. InjectDebugCall in the runtime tests demonstrates this protocol.
1562//
1563// The debugger must ensure that any pointers passed to the function
1564// obey escape analysis requirements. Specifically, it must not pass
1565// a stack pointer to an escaping argument. debugCallV1 cannot check
1566// this invariant.
1567//
1568// This is ABIInternal because Go code injects its PC directly into new
1569// goroutine stacks.
1570TEXT runtime·debugCallV1<ABIInternal>(SB),NOSPLIT,$152-0
1571 // Save all registers that may contain pointers so they can be
1572 // conservatively scanned.
1573 //
1574 // We can't do anything that might clobber any of these
1575 // registers before this.
1576 MOVQ R15, r15-(14*8+8)(SP)
1577 MOVQ R14, r14-(13*8+8)(SP)
1578 MOVQ R13, r13-(12*8+8)(SP)
1579 MOVQ R12, r12-(11*8+8)(SP)
1580 MOVQ R11, r11-(10*8+8)(SP)
1581 MOVQ R10, r10-(9*8+8)(SP)
1582 MOVQ R9, r9-(8*8+8)(SP)
1583 MOVQ R8, r8-(7*8+8)(SP)
1584 MOVQ DI, di-(6*8+8)(SP)
1585 MOVQ SI, si-(5*8+8)(SP)
1586 MOVQ BP, bp-(4*8+8)(SP)
1587 MOVQ BX, bx-(3*8+8)(SP)
1588 MOVQ DX, dx-(2*8+8)(SP)
1589 // Save the frame size before we clobber it. Either of the last
1590 // saves could clobber this depending on whether there's a saved BP.
1591 MOVQ frameSize-24(FP), DX // aka -16(RSP) before prologue
1592 MOVQ CX, cx-(1*8+8)(SP)
1593 MOVQ AX, ax-(0*8+8)(SP)
1594
1595 // Save the argument frame size.
1596 MOVQ DX, frameSize-128(SP)
1597
1598 // Perform a safe-point check.
1599 MOVQ retpc-8(FP), AX // Caller's PC
1600 MOVQ AX, 0(SP)
1601 CALL runtime·debugCallCheck(SB)
1602 MOVQ 8(SP), AX
1603 TESTQ AX, AX
1604 JZ good
1605 // The safety check failed. Put the reason string at the top
1606 // of the stack.
1607 MOVQ AX, 0(SP)
1608 MOVQ 16(SP), AX
1609 MOVQ AX, 8(SP)
1610 // Set AX to 8 and invoke INT3. The debugger should get the
1611 // reason a call can't be injected from the top of the stack
1612 // and resume execution.
1613 MOVQ $8, AX
1614 BYTE $0xcc
1615 JMP restore
1616
1617good:
1618 // Registers are saved and it's safe to make a call.
1619 // Open up a call frame, moving the stack if necessary.
1620 //
1621 // Once the frame is allocated, this will set AX to 0 and
1622 // invoke INT3. The debugger should write the argument
1623 // frame for the call at SP, push the trapping PC on the
1624 // stack, set the PC to the function to call, set RCX to point
1625 // to the closure (if a closure call), and resume execution.
1626 //
1627 // If the function returns, this will set AX to 1 and invoke
1628 // INT3. The debugger can then inspect any return value saved
1629 // on the stack at SP and resume execution again.
1630 //
1631 // If the function panics, this will set AX to 2 and invoke INT3.
1632 // The interface{} value of the panic will be at SP. The debugger
1633 // can inspect the panic value and resume execution again.
1634#define DEBUG_CALL_DISPATCH(NAME,MAXSIZE) \
1635 CMPQ AX, $MAXSIZE; \
1636 JA 5(PC); \
1637 MOVQ $NAME(SB), AX; \
1638 MOVQ AX, 0(SP); \
1639 CALL runtime·debugCallWrap(SB); \
1640 JMP restore
1641
1642 MOVQ frameSize-128(SP), AX
1643 DEBUG_CALL_DISPATCH(debugCall32<>, 32)
1644 DEBUG_CALL_DISPATCH(debugCall64<>, 64)
1645 DEBUG_CALL_DISPATCH(debugCall128<>, 128)
1646 DEBUG_CALL_DISPATCH(debugCall256<>, 256)
1647 DEBUG_CALL_DISPATCH(debugCall512<>, 512)
1648 DEBUG_CALL_DISPATCH(debugCall1024<>, 1024)
1649 DEBUG_CALL_DISPATCH(debugCall2048<>, 2048)
1650 DEBUG_CALL_DISPATCH(debugCall4096<>, 4096)
1651 DEBUG_CALL_DISPATCH(debugCall8192<>, 8192)
1652 DEBUG_CALL_DISPATCH(debugCall16384<>, 16384)
1653 DEBUG_CALL_DISPATCH(debugCall32768<>, 32768)
1654 DEBUG_CALL_DISPATCH(debugCall65536<>, 65536)
1655 // The frame size is too large. Report the error.
1656 MOVQ $debugCallFrameTooLarge<>(SB), AX
1657 MOVQ AX, 0(SP)
1658 MOVQ $20, 8(SP) // length of debugCallFrameTooLarge string
1659 MOVQ $8, AX
1660 BYTE $0xcc
1661 JMP restore
1662
1663restore:
1664 // Calls and failures resume here.
1665 //
1666 // Set AX to 16 and invoke INT3. The debugger should restore
1667 // all registers except RIP and RSP and resume execution.
1668 MOVQ $16, AX
1669 BYTE $0xcc
1670 // We must not modify flags after this point.
1671
1672 // Restore pointer-containing registers, which may have been
1673 // modified from the debugger's copy by stack copying.
1674 MOVQ ax-(0*8+8)(SP), AX
1675 MOVQ cx-(1*8+8)(SP), CX
1676 MOVQ dx-(2*8+8)(SP), DX
1677 MOVQ bx-(3*8+8)(SP), BX
1678 MOVQ bp-(4*8+8)(SP), BP
1679 MOVQ si-(5*8+8)(SP), SI
1680 MOVQ di-(6*8+8)(SP), DI
1681 MOVQ r8-(7*8+8)(SP), R8
1682 MOVQ r9-(8*8+8)(SP), R9
1683 MOVQ r10-(9*8+8)(SP), R10
1684 MOVQ r11-(10*8+8)(SP), R11
1685 MOVQ r12-(11*8+8)(SP), R12
1686 MOVQ r13-(12*8+8)(SP), R13
1687 MOVQ r14-(13*8+8)(SP), R14
1688 MOVQ r15-(14*8+8)(SP), R15
1689
1690 RET
1691
1692// runtime.debugCallCheck assumes that functions defined with the
1693// DEBUG_CALL_FN macro are safe points to inject calls.
1694#define DEBUG_CALL_FN(NAME,MAXSIZE) \
1695TEXT NAME(SB),WRAPPER,$MAXSIZE-0; \
1696 NO_LOCAL_POINTERS; \
1697 MOVQ $0, AX; \
1698 BYTE $0xcc; \
1699 MOVQ $1, AX; \
1700 BYTE $0xcc; \
1701 RET
1702DEBUG_CALL_FN(debugCall32<>, 32)
1703DEBUG_CALL_FN(debugCall64<>, 64)
1704DEBUG_CALL_FN(debugCall128<>, 128)
1705DEBUG_CALL_FN(debugCall256<>, 256)
1706DEBUG_CALL_FN(debugCall512<>, 512)
1707DEBUG_CALL_FN(debugCall1024<>, 1024)
1708DEBUG_CALL_FN(debugCall2048<>, 2048)
1709DEBUG_CALL_FN(debugCall4096<>, 4096)
1710DEBUG_CALL_FN(debugCall8192<>, 8192)
1711DEBUG_CALL_FN(debugCall16384<>, 16384)
1712DEBUG_CALL_FN(debugCall32768<>, 32768)
1713DEBUG_CALL_FN(debugCall65536<>, 65536)
1714
1715// func debugCallPanicked(val interface{})
1716TEXT runtime·debugCallPanicked(SB),NOSPLIT,$16-16
1717 // Copy the panic value to the top of stack.
1718 MOVQ val_type+0(FP), AX
1719 MOVQ AX, 0(SP)
1720 MOVQ val_data+8(FP), AX
1721 MOVQ AX, 8(SP)
1722 MOVQ $2, AX
1723 BYTE $0xcc
1724 RET
1725
1726// Note: these functions use a special calling convention to save generated code space.
1727// Arguments are passed in registers, but the space for those arguments are allocated
1728// in the caller's stack frame. These stubs write the args into that stack space and
1729// then tail call to the corresponding runtime handler.
1730// The tail call makes these stubs disappear in backtraces.
1731// Defined as ABIInternal since they do not use the stack-based Go ABI.
1732TEXT runtime·panicIndex<ABIInternal>(SB),NOSPLIT,$0-16
1733 MOVQ AX, x+0(FP)
1734 MOVQ CX, y+8(FP)
1735 JMP runtime·goPanicIndex(SB)
1736TEXT runtime·panicIndexU<ABIInternal>(SB),NOSPLIT,$0-16
1737 MOVQ AX, x+0(FP)
1738 MOVQ CX, y+8(FP)
1739 JMP runtime·goPanicIndexU(SB)
1740TEXT runtime·panicSliceAlen<ABIInternal>(SB),NOSPLIT,$0-16
1741 MOVQ CX, x+0(FP)
1742 MOVQ DX, y+8(FP)
1743 JMP runtime·goPanicSliceAlen(SB)
1744TEXT runtime·panicSliceAlenU<ABIInternal>(SB),NOSPLIT,$0-16
1745 MOVQ CX, x+0(FP)
1746 MOVQ DX, y+8(FP)
1747 JMP runtime·goPanicSliceAlenU(SB)
1748TEXT runtime·panicSliceAcap<ABIInternal>(SB),NOSPLIT,$0-16
1749 MOVQ CX, x+0(FP)
1750 MOVQ DX, y+8(FP)
1751 JMP runtime·goPanicSliceAcap(SB)
1752TEXT runtime·panicSliceAcapU<ABIInternal>(SB),NOSPLIT,$0-16
1753 MOVQ CX, x+0(FP)
1754 MOVQ DX, y+8(FP)
1755 JMP runtime·goPanicSliceAcapU(SB)
1756TEXT runtime·panicSliceB<ABIInternal>(SB),NOSPLIT,$0-16
1757 MOVQ AX, x+0(FP)
1758 MOVQ CX, y+8(FP)
1759 JMP runtime·goPanicSliceB(SB)
1760TEXT runtime·panicSliceBU<ABIInternal>(SB),NOSPLIT,$0-16
1761 MOVQ AX, x+0(FP)
1762 MOVQ CX, y+8(FP)
1763 JMP runtime·goPanicSliceBU(SB)
1764TEXT runtime·panicSlice3Alen<ABIInternal>(SB),NOSPLIT,$0-16
1765 MOVQ DX, x+0(FP)
1766 MOVQ BX, y+8(FP)
1767 JMP runtime·goPanicSlice3Alen(SB)
1768TEXT runtime·panicSlice3AlenU<ABIInternal>(SB),NOSPLIT,$0-16
1769 MOVQ DX, x+0(FP)
1770 MOVQ BX, y+8(FP)
1771 JMP runtime·goPanicSlice3AlenU(SB)
1772TEXT runtime·panicSlice3Acap<ABIInternal>(SB),NOSPLIT,$0-16
1773 MOVQ DX, x+0(FP)
1774 MOVQ BX, y+8(FP)
1775 JMP runtime·goPanicSlice3Acap(SB)
1776TEXT runtime·panicSlice3AcapU<ABIInternal>(SB),NOSPLIT,$0-16
1777 MOVQ DX, x+0(FP)
1778 MOVQ BX, y+8(FP)
1779 JMP runtime·goPanicSlice3AcapU(SB)
1780TEXT runtime·panicSlice3B<ABIInternal>(SB),NOSPLIT,$0-16
1781 MOVQ CX, x+0(FP)
1782 MOVQ DX, y+8(FP)
1783 JMP runtime·goPanicSlice3B(SB)
1784TEXT runtime·panicSlice3BU<ABIInternal>(SB),NOSPLIT,$0-16
1785 MOVQ CX, x+0(FP)
1786 MOVQ DX, y+8(FP)
1787 JMP runtime·goPanicSlice3BU(SB)
1788TEXT runtime·panicSlice3C<ABIInternal>(SB),NOSPLIT,$0-16
1789 MOVQ AX, x+0(FP)
1790 MOVQ CX, y+8(FP)
1791 JMP runtime·goPanicSlice3C(SB)
1792TEXT runtime·panicSlice3CU<ABIInternal>(SB),NOSPLIT,$0-16
1793 MOVQ AX, x+0(FP)
1794 MOVQ CX, y+8(FP)
1795 JMP runtime·goPanicSlice3CU(SB)
1796
1797#ifdef GOOS_android
1798// Use the free TLS_SLOT_APP slot #2 on Android Q.
1799// Earlier androids are set up in gcc_android.c.
1800DATA runtime·tls_g+0(SB)/8, $16
1801GLOBL runtime·tls_g+0(SB), NOPTR, $8
1802#endif
1803
1804// The compiler and assembler's -spectre=ret mode rewrites
1805// all indirect CALL AX / JMP AX instructions to be
1806// CALL retpolineAX / JMP retpolineAX.
1807// See https://support.google.com/faqs/answer/7625886.
1808#define RETPOLINE(reg) \
1809 /* CALL setup */ BYTE $0xE8; BYTE $(2+2); BYTE $0; BYTE $0; BYTE $0; \
1810 /* nospec: */ \
1811 /* PAUSE */ BYTE $0xF3; BYTE $0x90; \
1812 /* JMP nospec */ BYTE $0xEB; BYTE $-(2+2); \
1813 /* setup: */ \
1814 /* MOVQ AX, 0(SP) */ BYTE $0x48|((reg&8)>>1); BYTE $0x89; \
1815 BYTE $0x04|((reg&7)<<3); BYTE $0x24; \
1816 /* RET */ BYTE $0xC3
1817
1818TEXT runtime·retpolineAX(SB),NOSPLIT,$0; RETPOLINE(0)
1819TEXT runtime·retpolineCX(SB),NOSPLIT,$0; RETPOLINE(1)
1820TEXT runtime·retpolineDX(SB),NOSPLIT,$0; RETPOLINE(2)
1821TEXT runtime·retpolineBX(SB),NOSPLIT,$0; RETPOLINE(3)
1822/* SP is 4, can't happen / magic encodings */
1823TEXT runtime·retpolineBP(SB),NOSPLIT,$0; RETPOLINE(5)
1824TEXT runtime·retpolineSI(SB),NOSPLIT,$0; RETPOLINE(6)
1825TEXT runtime·retpolineDI(SB),NOSPLIT,$0; RETPOLINE(7)
1826TEXT runtime·retpolineR8(SB),NOSPLIT,$0; RETPOLINE(8)
1827TEXT runtime·retpolineR9(SB),NOSPLIT,$0; RETPOLINE(9)
1828TEXT runtime·retpolineR10(SB),NOSPLIT,$0; RETPOLINE(10)
1829TEXT runtime·retpolineR11(SB),NOSPLIT,$0; RETPOLINE(11)
1830TEXT runtime·retpolineR12(SB),NOSPLIT,$0; RETPOLINE(12)
1831TEXT runtime·retpolineR13(SB),NOSPLIT,$0; RETPOLINE(13)
1832TEXT runtime·retpolineR14(SB),NOSPLIT,$0; RETPOLINE(14)
1833TEXT runtime·retpolineR15(SB),NOSPLIT,$0; RETPOLINE(15)
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