Text file
src/runtime/asm_mips64x.s
1 // Copyright 2015 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 //go:build mips64 || mips64le
6
7 #include "go_asm.h"
8 #include "go_tls.h"
9 #include "funcdata.h"
10 #include "textflag.h"
11
12 #define REGCTXT R22
13
14 TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0
15 // R29 = stack; R4 = argc; R5 = argv
16
17 ADDV $-24, R29
18 MOVW R4, 8(R29) // argc
19 MOVV R5, 16(R29) // argv
20
21 // create istack out of the given (operating system) stack.
22 // _cgo_init may update stackguard.
23 MOVV $runtime·g0(SB), g
24 MOVV $(-64*1024), R23
25 ADDV R23, R29, R1
26 MOVV R1, g_stackguard0(g)
27 MOVV R1, g_stackguard1(g)
28 MOVV R1, (g_stack+stack_lo)(g)
29 MOVV R29, (g_stack+stack_hi)(g)
30
31 // if there is a _cgo_init, call it using the gcc ABI.
32 MOVV _cgo_init(SB), R25
33 BEQ R25, nocgo
34
35 MOVV R0, R7 // arg 3: not used
36 MOVV R0, R6 // arg 2: not used
37 MOVV $setg_gcc<>(SB), R5 // arg 1: setg
38 MOVV g, R4 // arg 0: G
39 JAL (R25)
40
41 nocgo:
42 // update stackguard after _cgo_init
43 MOVV (g_stack+stack_lo)(g), R1
44 ADDV $const_stackGuard, R1
45 MOVV R1, g_stackguard0(g)
46 MOVV R1, g_stackguard1(g)
47
48 // set the per-goroutine and per-mach "registers"
49 MOVV $runtime·m0(SB), R1
50
51 // save m->g0 = g0
52 MOVV g, m_g0(R1)
53 // save m0 to g0->m
54 MOVV R1, g_m(g)
55
56 JAL runtime·check(SB)
57
58 // args are already prepared
59 JAL runtime·args(SB)
60 JAL runtime·osinit(SB)
61 JAL runtime·schedinit(SB)
62
63 // create a new goroutine to start program
64 MOVV $runtime·mainPC(SB), R1 // entry
65 ADDV $-16, R29
66 MOVV R1, 8(R29)
67 MOVV R0, 0(R29)
68 JAL runtime·newproc(SB)
69 ADDV $16, R29
70
71 // start this M
72 JAL runtime·mstart(SB)
73
74 MOVV R0, 1(R0)
75 RET
76
77 DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
78 GLOBL runtime·mainPC(SB),RODATA,$8
79
80 TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0
81 MOVV R0, 2(R0) // TODO: TD
82 RET
83
84 TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0
85 RET
86
87 TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0
88 JAL runtime·mstart0(SB)
89 RET // not reached
90
91 /*
92 * go-routine
93 */
94
95 // void gogo(Gobuf*)
96 // restore state from Gobuf; longjmp
97 TEXT runtime·gogo(SB), NOSPLIT|NOFRAME, $0-8
98 MOVV buf+0(FP), R3
99 MOVV gobuf_g(R3), R4
100 MOVV 0(R4), R0 // make sure g != nil
101 JMP gogo<>(SB)
102
103 TEXT gogo<>(SB), NOSPLIT|NOFRAME, $0
104 MOVV R4, g
105 JAL runtime·save_g(SB)
106
107 MOVV 0(g), R2
108 MOVV gobuf_sp(R3), R29
109 MOVV gobuf_lr(R3), R31
110 MOVV gobuf_ret(R3), R1
111 MOVV gobuf_ctxt(R3), REGCTXT
112 MOVV R0, gobuf_sp(R3)
113 MOVV R0, gobuf_ret(R3)
114 MOVV R0, gobuf_lr(R3)
115 MOVV R0, gobuf_ctxt(R3)
116 MOVV gobuf_pc(R3), R4
117 JMP (R4)
118
119 // void mcall(fn func(*g))
120 // Switch to m->g0's stack, call fn(g).
121 // Fn must never return. It should gogo(&g->sched)
122 // to keep running g.
123 TEXT runtime·mcall(SB), NOSPLIT|NOFRAME, $0-8
124 // Save caller state in g->sched
125 MOVV R29, (g_sched+gobuf_sp)(g)
126 MOVV R31, (g_sched+gobuf_pc)(g)
127 MOVV R0, (g_sched+gobuf_lr)(g)
128
129 // Switch to m->g0 & its stack, call fn.
130 MOVV g, R1
131 MOVV g_m(g), R3
132 MOVV m_g0(R3), g
133 JAL runtime·save_g(SB)
134 BNE g, R1, 2(PC)
135 JMP runtime·badmcall(SB)
136 MOVV fn+0(FP), REGCTXT // context
137 MOVV 0(REGCTXT), R4 // code pointer
138 MOVV (g_sched+gobuf_sp)(g), R29 // sp = m->g0->sched.sp
139 ADDV $-16, R29
140 MOVV R1, 8(R29)
141 MOVV R0, 0(R29)
142 JAL (R4)
143 JMP runtime·badmcall2(SB)
144
145 // systemstack_switch is a dummy routine that systemstack leaves at the bottom
146 // of the G stack. We need to distinguish the routine that
147 // lives at the bottom of the G stack from the one that lives
148 // at the top of the system stack because the one at the top of
149 // the system stack terminates the stack walk (see topofstack()).
150 TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0
151 UNDEF
152 JAL (R31) // make sure this function is not leaf
153 RET
154
155 // func systemstack(fn func())
156 TEXT runtime·systemstack(SB), NOSPLIT, $0-8
157 MOVV fn+0(FP), R1 // R1 = fn
158 MOVV R1, REGCTXT // context
159 MOVV g_m(g), R2 // R2 = m
160
161 MOVV m_gsignal(R2), R3 // R3 = gsignal
162 BEQ g, R3, noswitch
163
164 MOVV m_g0(R2), R3 // R3 = g0
165 BEQ g, R3, noswitch
166
167 MOVV m_curg(R2), R4
168 BEQ g, R4, switch
169
170 // Bad: g is not gsignal, not g0, not curg. What is it?
171 // Hide call from linker nosplit analysis.
172 MOVV $runtime·badsystemstack(SB), R4
173 JAL (R4)
174 JAL runtime·abort(SB)
175
176 switch:
177 // save our state in g->sched. Pretend to
178 // be systemstack_switch if the G stack is scanned.
179 JAL gosave_systemstack_switch<>(SB)
180
181 // switch to g0
182 MOVV R3, g
183 JAL runtime·save_g(SB)
184 MOVV (g_sched+gobuf_sp)(g), R1
185 MOVV R1, R29
186
187 // call target function
188 MOVV 0(REGCTXT), R4 // code pointer
189 JAL (R4)
190
191 // switch back to g
192 MOVV g_m(g), R1
193 MOVV m_curg(R1), g
194 JAL runtime·save_g(SB)
195 MOVV (g_sched+gobuf_sp)(g), R29
196 MOVV R0, (g_sched+gobuf_sp)(g)
197 RET
198
199 noswitch:
200 // already on m stack, just call directly
201 // Using a tail call here cleans up tracebacks since we won't stop
202 // at an intermediate systemstack.
203 MOVV 0(REGCTXT), R4 // code pointer
204 MOVV 0(R29), R31 // restore LR
205 ADDV $8, R29
206 JMP (R4)
207
208 // func switchToCrashStack0(fn func())
209 TEXT runtime·switchToCrashStack0(SB), NOSPLIT, $0-8
210 MOVV fn+0(FP), REGCTXT // context register
211 MOVV g_m(g), R2 // curm
212
213 // set g to gcrash
214 MOVV $runtime·gcrash(SB), g // g = &gcrash
215 CALL runtime·save_g(SB)
216 MOVV R2, g_m(g) // g.m = curm
217 MOVV g, m_g0(R2) // curm.g0 = g
218
219 // switch to crashstack
220 MOVV (g_stack+stack_hi)(g), R2
221 ADDV $(-4*8), R2, R29
222
223 // call target function
224 MOVV 0(REGCTXT), R25
225 JAL (R25)
226
227 // should never return
228 CALL runtime·abort(SB)
229 UNDEF
230
231 /*
232 * support for morestack
233 */
234
235 // Called during function prolog when more stack is needed.
236 // Caller has already loaded:
237 // R1: framesize, R2: argsize, R3: LR
238 //
239 // The traceback routines see morestack on a g0 as being
240 // the top of a stack (for example, morestack calling newstack
241 // calling the scheduler calling newm calling gc), so we must
242 // record an argument size. For that purpose, it has no arguments.
243 TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
244 // Called from f.
245 // Set g->sched to context in f.
246 MOVV R29, (g_sched+gobuf_sp)(g)
247 MOVV R31, (g_sched+gobuf_pc)(g)
248 MOVV R3, (g_sched+gobuf_lr)(g)
249 MOVV REGCTXT, (g_sched+gobuf_ctxt)(g)
250
251 // Cannot grow scheduler stack (m->g0).
252 MOVV g_m(g), R7
253 MOVV m_g0(R7), R8
254 BNE g, R8, 3(PC)
255 JAL runtime·badmorestackg0(SB)
256 JAL runtime·abort(SB)
257
258 // Cannot grow signal stack (m->gsignal).
259 MOVV m_gsignal(R7), R8
260 BNE g, R8, 3(PC)
261 JAL runtime·badmorestackgsignal(SB)
262 JAL runtime·abort(SB)
263
264 // Called from f.
265 // Set m->morebuf to f's caller.
266 MOVV R3, (m_morebuf+gobuf_pc)(R7) // f's caller's PC
267 MOVV R29, (m_morebuf+gobuf_sp)(R7) // f's caller's SP
268 MOVV g, (m_morebuf+gobuf_g)(R7)
269
270 // Call newstack on m->g0's stack.
271 MOVV m_g0(R7), g
272 JAL runtime·save_g(SB)
273 MOVV (g_sched+gobuf_sp)(g), R29
274 // Create a stack frame on g0 to call newstack.
275 MOVV R0, -8(R29) // Zero saved LR in frame
276 ADDV $-8, R29
277 JAL runtime·newstack(SB)
278
279 // Not reached, but make sure the return PC from the call to newstack
280 // is still in this function, and not the beginning of the next.
281 UNDEF
282
283 TEXT runtime·morestack_noctxt(SB),NOSPLIT|NOFRAME,$0-0
284 // Force SPWRITE. This function doesn't actually write SP,
285 // but it is called with a special calling convention where
286 // the caller doesn't save LR on stack but passes it as a
287 // register (R3), and the unwinder currently doesn't understand.
288 // Make it SPWRITE to stop unwinding. (See issue 54332)
289 MOVV R29, R29
290
291 MOVV R0, REGCTXT
292 JMP runtime·morestack(SB)
293
294 // reflectcall: call a function with the given argument list
295 // func call(stackArgsType *_type, f *FuncVal, stackArgs *byte, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs).
296 // we don't have variable-sized frames, so we use a small number
297 // of constant-sized-frame functions to encode a few bits of size in the pc.
298 // Caution: ugly multiline assembly macros in your future!
299
300 #define DISPATCH(NAME,MAXSIZE) \
301 MOVV $MAXSIZE, R23; \
302 SGTU R1, R23, R23; \
303 BNE R23, 3(PC); \
304 MOVV $NAME(SB), R4; \
305 JMP (R4)
306 // Note: can't just "BR NAME(SB)" - bad inlining results.
307
308 TEXT ·reflectcall(SB), NOSPLIT|NOFRAME, $0-48
309 MOVWU frameSize+32(FP), R1
310 DISPATCH(runtime·call16, 16)
311 DISPATCH(runtime·call32, 32)
312 DISPATCH(runtime·call64, 64)
313 DISPATCH(runtime·call128, 128)
314 DISPATCH(runtime·call256, 256)
315 DISPATCH(runtime·call512, 512)
316 DISPATCH(runtime·call1024, 1024)
317 DISPATCH(runtime·call2048, 2048)
318 DISPATCH(runtime·call4096, 4096)
319 DISPATCH(runtime·call8192, 8192)
320 DISPATCH(runtime·call16384, 16384)
321 DISPATCH(runtime·call32768, 32768)
322 DISPATCH(runtime·call65536, 65536)
323 DISPATCH(runtime·call131072, 131072)
324 DISPATCH(runtime·call262144, 262144)
325 DISPATCH(runtime·call524288, 524288)
326 DISPATCH(runtime·call1048576, 1048576)
327 DISPATCH(runtime·call2097152, 2097152)
328 DISPATCH(runtime·call4194304, 4194304)
329 DISPATCH(runtime·call8388608, 8388608)
330 DISPATCH(runtime·call16777216, 16777216)
331 DISPATCH(runtime·call33554432, 33554432)
332 DISPATCH(runtime·call67108864, 67108864)
333 DISPATCH(runtime·call134217728, 134217728)
334 DISPATCH(runtime·call268435456, 268435456)
335 DISPATCH(runtime·call536870912, 536870912)
336 DISPATCH(runtime·call1073741824, 1073741824)
337 MOVV $runtime·badreflectcall(SB), R4
338 JMP (R4)
339
340 #define CALLFN(NAME,MAXSIZE) \
341 TEXT NAME(SB), WRAPPER, $MAXSIZE-48; \
342 NO_LOCAL_POINTERS; \
343 /* copy arguments to stack */ \
344 MOVV stackArgs+16(FP), R1; \
345 MOVWU stackArgsSize+24(FP), R2; \
346 MOVV R29, R3; \
347 ADDV $8, R3; \
348 ADDV R3, R2; \
349 BEQ R3, R2, 6(PC); \
350 MOVBU (R1), R4; \
351 ADDV $1, R1; \
352 MOVBU R4, (R3); \
353 ADDV $1, R3; \
354 JMP -5(PC); \
355 /* call function */ \
356 MOVV f+8(FP), REGCTXT; \
357 MOVV (REGCTXT), R4; \
358 PCDATA $PCDATA_StackMapIndex, $0; \
359 JAL (R4); \
360 /* copy return values back */ \
361 MOVV stackArgsType+0(FP), R5; \
362 MOVV stackArgs+16(FP), R1; \
363 MOVWU stackArgsSize+24(FP), R2; \
364 MOVWU stackRetOffset+28(FP), R4; \
365 ADDV $8, R29, R3; \
366 ADDV R4, R3; \
367 ADDV R4, R1; \
368 SUBVU R4, R2; \
369 JAL callRet<>(SB); \
370 RET
371
372 // callRet copies return values back at the end of call*. This is a
373 // separate function so it can allocate stack space for the arguments
374 // to reflectcallmove. It does not follow the Go ABI; it expects its
375 // arguments in registers.
376 TEXT callRet<>(SB), NOSPLIT, $40-0
377 MOVV R5, 8(R29)
378 MOVV R1, 16(R29)
379 MOVV R3, 24(R29)
380 MOVV R2, 32(R29)
381 MOVV $0, 40(R29)
382 JAL runtime·reflectcallmove(SB)
383 RET
384
385 CALLFN(·call16, 16)
386 CALLFN(·call32, 32)
387 CALLFN(·call64, 64)
388 CALLFN(·call128, 128)
389 CALLFN(·call256, 256)
390 CALLFN(·call512, 512)
391 CALLFN(·call1024, 1024)
392 CALLFN(·call2048, 2048)
393 CALLFN(·call4096, 4096)
394 CALLFN(·call8192, 8192)
395 CALLFN(·call16384, 16384)
396 CALLFN(·call32768, 32768)
397 CALLFN(·call65536, 65536)
398 CALLFN(·call131072, 131072)
399 CALLFN(·call262144, 262144)
400 CALLFN(·call524288, 524288)
401 CALLFN(·call1048576, 1048576)
402 CALLFN(·call2097152, 2097152)
403 CALLFN(·call4194304, 4194304)
404 CALLFN(·call8388608, 8388608)
405 CALLFN(·call16777216, 16777216)
406 CALLFN(·call33554432, 33554432)
407 CALLFN(·call67108864, 67108864)
408 CALLFN(·call134217728, 134217728)
409 CALLFN(·call268435456, 268435456)
410 CALLFN(·call536870912, 536870912)
411 CALLFN(·call1073741824, 1073741824)
412
413 TEXT runtime·procyield(SB),NOSPLIT,$0-0
414 RET
415
416 // Save state of caller into g->sched,
417 // but using fake PC from systemstack_switch.
418 // Must only be called from functions with no locals ($0)
419 // or else unwinding from systemstack_switch is incorrect.
420 // Smashes R1.
421 TEXT gosave_systemstack_switch<>(SB),NOSPLIT|NOFRAME,$0
422 MOVV $runtime·systemstack_switch(SB), R1
423 ADDV $8, R1 // get past prologue
424 MOVV R1, (g_sched+gobuf_pc)(g)
425 MOVV R29, (g_sched+gobuf_sp)(g)
426 MOVV R0, (g_sched+gobuf_lr)(g)
427 MOVV R0, (g_sched+gobuf_ret)(g)
428 // Assert ctxt is zero. See func save.
429 MOVV (g_sched+gobuf_ctxt)(g), R1
430 BEQ R1, 2(PC)
431 JAL runtime·abort(SB)
432 RET
433
434 // func asmcgocall_no_g(fn, arg unsafe.Pointer)
435 // Call fn(arg) aligned appropriately for the gcc ABI.
436 // Called on a system stack, and there may be no g yet (during needm).
437 TEXT ·asmcgocall_no_g(SB),NOSPLIT,$0-16
438 MOVV fn+0(FP), R25
439 MOVV arg+8(FP), R4
440 JAL (R25)
441 RET
442
443 // func asmcgocall(fn, arg unsafe.Pointer) int32
444 // Call fn(arg) on the scheduler stack,
445 // aligned appropriately for the gcc ABI.
446 // See cgocall.go for more details.
447 TEXT ·asmcgocall(SB),NOSPLIT,$0-20
448 MOVV fn+0(FP), R25
449 MOVV arg+8(FP), R4
450
451 MOVV R29, R3 // save original stack pointer
452 MOVV g, R2
453
454 // Figure out if we need to switch to m->g0 stack.
455 // We get called to create new OS threads too, and those
456 // come in on the m->g0 stack already. Or we might already
457 // be on the m->gsignal stack.
458 MOVV g_m(g), R5
459 MOVV m_gsignal(R5), R6
460 BEQ R6, g, g0
461 MOVV m_g0(R5), R6
462 BEQ R6, g, g0
463
464 JAL gosave_systemstack_switch<>(SB)
465 MOVV R6, g
466 JAL runtime·save_g(SB)
467 MOVV (g_sched+gobuf_sp)(g), R29
468
469 // Now on a scheduling stack (a pthread-created stack).
470 g0:
471 // Save room for two of our pointers.
472 ADDV $-16, R29
473 MOVV R2, 0(R29) // save old g on stack
474 MOVV (g_stack+stack_hi)(R2), R2
475 SUBVU R3, R2
476 MOVV R2, 8(R29) // save depth in old g stack (can't just save SP, as stack might be copied during a callback)
477 JAL (R25)
478
479 // Restore g, stack pointer. R2 is return value.
480 MOVV 0(R29), g
481 JAL runtime·save_g(SB)
482 MOVV (g_stack+stack_hi)(g), R5
483 MOVV 8(R29), R6
484 SUBVU R6, R5
485 MOVV R5, R29
486
487 MOVW R2, ret+16(FP)
488 RET
489
490 // func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)
491 // See cgocall.go for more details.
492 TEXT ·cgocallback(SB),NOSPLIT,$24-24
493 NO_LOCAL_POINTERS
494
495 // Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.
496 // It is used to dropm while thread is exiting.
497 MOVV fn+0(FP), R5
498 BNE R5, loadg
499 // Restore the g from frame.
500 MOVV frame+8(FP), g
501 JMP dropm
502
503 loadg:
504 // Load m and g from thread-local storage.
505 MOVB runtime·iscgo(SB), R1
506 BEQ R1, nocgo
507 JAL runtime·load_g(SB)
508 nocgo:
509
510 // If g is nil, Go did not create the current thread,
511 // or if this thread never called into Go on pthread platforms.
512 // Call needm to obtain one for temporary use.
513 // In this case, we're running on the thread stack, so there's
514 // lots of space, but the linker doesn't know. Hide the call from
515 // the linker analysis by using an indirect call.
516 BEQ g, needm
517
518 MOVV g_m(g), R3
519 MOVV R3, savedm-8(SP)
520 JMP havem
521
522 needm:
523 MOVV g, savedm-8(SP) // g is zero, so is m.
524 MOVV $runtime·needAndBindM(SB), R4
525 JAL (R4)
526
527 // Set m->sched.sp = SP, so that if a panic happens
528 // during the function we are about to execute, it will
529 // have a valid SP to run on the g0 stack.
530 // The next few lines (after the havem label)
531 // will save this SP onto the stack and then write
532 // the same SP back to m->sched.sp. That seems redundant,
533 // but if an unrecovered panic happens, unwindm will
534 // restore the g->sched.sp from the stack location
535 // and then systemstack will try to use it. If we don't set it here,
536 // that restored SP will be uninitialized (typically 0) and
537 // will not be usable.
538 MOVV g_m(g), R3
539 MOVV m_g0(R3), R1
540 MOVV R29, (g_sched+gobuf_sp)(R1)
541
542 havem:
543 // Now there's a valid m, and we're running on its m->g0.
544 // Save current m->g0->sched.sp on stack and then set it to SP.
545 // Save current sp in m->g0->sched.sp in preparation for
546 // switch back to m->curg stack.
547 // NOTE: unwindm knows that the saved g->sched.sp is at 8(R29) aka savedsp-16(SP).
548 MOVV m_g0(R3), R1
549 MOVV (g_sched+gobuf_sp)(R1), R2
550 MOVV R2, savedsp-24(SP) // must match frame size
551 MOVV R29, (g_sched+gobuf_sp)(R1)
552
553 // Switch to m->curg stack and call runtime.cgocallbackg.
554 // Because we are taking over the execution of m->curg
555 // but *not* resuming what had been running, we need to
556 // save that information (m->curg->sched) so we can restore it.
557 // We can restore m->curg->sched.sp easily, because calling
558 // runtime.cgocallbackg leaves SP unchanged upon return.
559 // To save m->curg->sched.pc, we push it onto the curg stack and
560 // open a frame the same size as cgocallback's g0 frame.
561 // Once we switch to the curg stack, the pushed PC will appear
562 // to be the return PC of cgocallback, so that the traceback
563 // will seamlessly trace back into the earlier calls.
564 MOVV m_curg(R3), g
565 JAL runtime·save_g(SB)
566 MOVV (g_sched+gobuf_sp)(g), R2 // prepare stack as R2
567 MOVV (g_sched+gobuf_pc)(g), R4
568 MOVV R4, -(24+8)(R2) // "saved LR"; must match frame size
569 // Gather our arguments into registers.
570 MOVV fn+0(FP), R5
571 MOVV frame+8(FP), R6
572 MOVV ctxt+16(FP), R7
573 MOVV $-(24+8)(R2), R29 // switch stack; must match frame size
574 MOVV R5, 8(R29)
575 MOVV R6, 16(R29)
576 MOVV R7, 24(R29)
577 JAL runtime·cgocallbackg(SB)
578
579 // Restore g->sched (== m->curg->sched) from saved values.
580 MOVV 0(R29), R4
581 MOVV R4, (g_sched+gobuf_pc)(g)
582 MOVV $(24+8)(R29), R2 // must match frame size
583 MOVV R2, (g_sched+gobuf_sp)(g)
584
585 // Switch back to m->g0's stack and restore m->g0->sched.sp.
586 // (Unlike m->curg, the g0 goroutine never uses sched.pc,
587 // so we do not have to restore it.)
588 MOVV g_m(g), R3
589 MOVV m_g0(R3), g
590 JAL runtime·save_g(SB)
591 MOVV (g_sched+gobuf_sp)(g), R29
592 MOVV savedsp-24(SP), R2 // must match frame size
593 MOVV R2, (g_sched+gobuf_sp)(g)
594
595 // If the m on entry was nil, we called needm above to borrow an m,
596 // 1. for the duration of the call on non-pthread platforms,
597 // 2. or the duration of the C thread alive on pthread platforms.
598 // If the m on entry wasn't nil,
599 // 1. the thread might be a Go thread,
600 // 2. or it wasn't the first call from a C thread on pthread platforms,
601 // since then we skip dropm to reuse the m in the first call.
602 MOVV savedm-8(SP), R3
603 BNE R3, droppedm
604
605 // Skip dropm to reuse it in the next call, when a pthread key has been created.
606 MOVV _cgo_pthread_key_created(SB), R3
607 // It means cgo is disabled when _cgo_pthread_key_created is a nil pointer, need dropm.
608 BEQ R3, dropm
609 MOVV (R3), R3
610 BNE R3, droppedm
611
612 dropm:
613 MOVV $runtime·dropm(SB), R4
614 JAL (R4)
615 droppedm:
616
617 // Done!
618 RET
619
620 // void setg(G*); set g. for use by needm.
621 TEXT runtime·setg(SB), NOSPLIT, $0-8
622 MOVV gg+0(FP), g
623 // This only happens if iscgo, so jump straight to save_g
624 JAL runtime·save_g(SB)
625 RET
626
627 // void setg_gcc(G*); set g called from gcc with g in R1
628 TEXT setg_gcc<>(SB),NOSPLIT,$0-0
629 MOVV R1, g
630 JAL runtime·save_g(SB)
631 RET
632
633 TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0
634 MOVW (R0), R0
635 UNDEF
636
637 // AES hashing not implemented for mips64
638 TEXT runtime·memhash(SB),NOSPLIT|NOFRAME,$0-32
639 JMP runtime·memhashFallback(SB)
640 TEXT runtime·strhash(SB),NOSPLIT|NOFRAME,$0-24
641 JMP runtime·strhashFallback(SB)
642 TEXT runtime·memhash32(SB),NOSPLIT|NOFRAME,$0-24
643 JMP runtime·memhash32Fallback(SB)
644 TEXT runtime·memhash64(SB),NOSPLIT|NOFRAME,$0-24
645 JMP runtime·memhash64Fallback(SB)
646
647 TEXT runtime·return0(SB), NOSPLIT, $0
648 MOVW $0, R1
649 RET
650
651 // Called from cgo wrappers, this function returns g->m->curg.stack.hi.
652 // Must obey the gcc calling convention.
653 TEXT _cgo_topofstack(SB),NOSPLIT,$16
654 // g (R30) and REGTMP (R23) might be clobbered by load_g. They
655 // are callee-save in the gcc calling convention, so save them.
656 MOVV R23, savedR23-16(SP)
657 MOVV g, savedG-8(SP)
658
659 JAL runtime·load_g(SB)
660 MOVV g_m(g), R1
661 MOVV m_curg(R1), R1
662 MOVV (g_stack+stack_hi)(R1), R2 // return value in R2
663
664 MOVV savedG-8(SP), g
665 MOVV savedR23-16(SP), R23
666 RET
667
668 // The top-most function running on a goroutine
669 // returns to goexit+PCQuantum.
670 TEXT runtime·goexit(SB),NOSPLIT|NOFRAME|TOPFRAME,$0-0
671 NOR R0, R0 // NOP
672 JAL runtime·goexit1(SB) // does not return
673 // traceback from goexit1 must hit code range of goexit
674 NOR R0, R0 // NOP
675
676 TEXT ·checkASM(SB),NOSPLIT,$0-1
677 MOVW $1, R1
678 MOVB R1, ret+0(FP)
679 RET
680
681 // gcWriteBarrier informs the GC about heap pointer writes.
682 //
683 // gcWriteBarrier does NOT follow the Go ABI. It accepts the
684 // number of bytes of buffer needed in R25, and returns a pointer
685 // to the buffer space in R25.
686 // It clobbers R23 (the linker temp register).
687 // The act of CALLing gcWriteBarrier will clobber R31 (LR).
688 // It does not clobber any other general-purpose registers,
689 // but may clobber others (e.g., floating point registers).
690 TEXT gcWriteBarrier<>(SB),NOSPLIT,$192
691 // Save the registers clobbered by the fast path.
692 MOVV R1, 184(R29)
693 MOVV R2, 192(R29)
694 retry:
695 MOVV g_m(g), R1
696 MOVV m_p(R1), R1
697 MOVV (p_wbBuf+wbBuf_next)(R1), R2
698 MOVV (p_wbBuf+wbBuf_end)(R1), R23 // R23 is linker temp register
699 // Increment wbBuf.next position.
700 ADDV R25, R2
701 // Is the buffer full?
702 SGTU R2, R23, R23
703 BNE R23, flush
704 // Commit to the larger buffer.
705 MOVV R2, (p_wbBuf+wbBuf_next)(R1)
706 // Make return value (the original next position)
707 SUBV R25, R2, R25
708 // Restore registers.
709 MOVV 184(R29), R1
710 MOVV 192(R29), R2
711 RET
712
713 flush:
714 // Save all general purpose registers since these could be
715 // clobbered by wbBufFlush and were not saved by the caller.
716 MOVV R20, 8(R29)
717 MOVV R21, 16(R29)
718 // R1 already saved
719 // R2 already saved
720 MOVV R3, 24(R29)
721 MOVV R4, 32(R29)
722 MOVV R5, 40(R29)
723 MOVV R6, 48(R29)
724 MOVV R7, 56(R29)
725 MOVV R8, 64(R29)
726 MOVV R9, 72(R29)
727 MOVV R10, 80(R29)
728 MOVV R11, 88(R29)
729 MOVV R12, 96(R29)
730 MOVV R13, 104(R29)
731 MOVV R14, 112(R29)
732 MOVV R15, 120(R29)
733 MOVV R16, 128(R29)
734 MOVV R17, 136(R29)
735 MOVV R18, 144(R29)
736 MOVV R19, 152(R29)
737 // R20 already saved
738 // R21 already saved.
739 MOVV R22, 160(R29)
740 // R23 is tmp register.
741 MOVV R24, 168(R29)
742 MOVV R25, 176(R29)
743 // R26 is reserved by kernel.
744 // R27 is reserved by kernel.
745 // R28 is REGSB (not modified by Go code).
746 // R29 is SP.
747 // R30 is g.
748 // R31 is LR, which was saved by the prologue.
749
750 CALL runtime·wbBufFlush(SB)
751
752 MOVV 8(R29), R20
753 MOVV 16(R29), R21
754 MOVV 24(R29), R3
755 MOVV 32(R29), R4
756 MOVV 40(R29), R5
757 MOVV 48(R29), R6
758 MOVV 56(R29), R7
759 MOVV 64(R29), R8
760 MOVV 72(R29), R9
761 MOVV 80(R29), R10
762 MOVV 88(R29), R11
763 MOVV 96(R29), R12
764 MOVV 104(R29), R13
765 MOVV 112(R29), R14
766 MOVV 120(R29), R15
767 MOVV 128(R29), R16
768 MOVV 136(R29), R17
769 MOVV 144(R29), R18
770 MOVV 152(R29), R19
771 MOVV 160(R29), R22
772 MOVV 168(R29), R24
773 MOVV 176(R29), R25
774 JMP retry
775
776 TEXT runtime·gcWriteBarrier1<ABIInternal>(SB),NOSPLIT,$0
777 MOVV $8, R25
778 JMP gcWriteBarrier<>(SB)
779 TEXT runtime·gcWriteBarrier2<ABIInternal>(SB),NOSPLIT,$0
780 MOVV $16, R25
781 JMP gcWriteBarrier<>(SB)
782 TEXT runtime·gcWriteBarrier3<ABIInternal>(SB),NOSPLIT,$0
783 MOVV $24, R25
784 JMP gcWriteBarrier<>(SB)
785 TEXT runtime·gcWriteBarrier4<ABIInternal>(SB),NOSPLIT,$0
786 MOVV $32, R25
787 JMP gcWriteBarrier<>(SB)
788 TEXT runtime·gcWriteBarrier5<ABIInternal>(SB),NOSPLIT,$0
789 MOVV $40, R25
790 JMP gcWriteBarrier<>(SB)
791 TEXT runtime·gcWriteBarrier6<ABIInternal>(SB),NOSPLIT,$0
792 MOVV $48, R25
793 JMP gcWriteBarrier<>(SB)
794 TEXT runtime·gcWriteBarrier7<ABIInternal>(SB),NOSPLIT,$0
795 MOVV $56, R25
796 JMP gcWriteBarrier<>(SB)
797 TEXT runtime·gcWriteBarrier8<ABIInternal>(SB),NOSPLIT,$0
798 MOVV $64, R25
799 JMP gcWriteBarrier<>(SB)
800
801 // Note: these functions use a special calling convention to save generated code space.
802 // Arguments are passed in registers, but the space for those arguments are allocated
803 // in the caller's stack frame. These stubs write the args into that stack space and
804 // then tail call to the corresponding runtime handler.
805 // The tail call makes these stubs disappear in backtraces.
806 TEXT runtime·panicIndex(SB),NOSPLIT,$0-16
807 MOVV R1, x+0(FP)
808 MOVV R2, y+8(FP)
809 JMP runtime·goPanicIndex(SB)
810 TEXT runtime·panicIndexU(SB),NOSPLIT,$0-16
811 MOVV R1, x+0(FP)
812 MOVV R2, y+8(FP)
813 JMP runtime·goPanicIndexU(SB)
814 TEXT runtime·panicSliceAlen(SB),NOSPLIT,$0-16
815 MOVV R2, x+0(FP)
816 MOVV R3, y+8(FP)
817 JMP runtime·goPanicSliceAlen(SB)
818 TEXT runtime·panicSliceAlenU(SB),NOSPLIT,$0-16
819 MOVV R2, x+0(FP)
820 MOVV R3, y+8(FP)
821 JMP runtime·goPanicSliceAlenU(SB)
822 TEXT runtime·panicSliceAcap(SB),NOSPLIT,$0-16
823 MOVV R2, x+0(FP)
824 MOVV R3, y+8(FP)
825 JMP runtime·goPanicSliceAcap(SB)
826 TEXT runtime·panicSliceAcapU(SB),NOSPLIT,$0-16
827 MOVV R2, x+0(FP)
828 MOVV R3, y+8(FP)
829 JMP runtime·goPanicSliceAcapU(SB)
830 TEXT runtime·panicSliceB(SB),NOSPLIT,$0-16
831 MOVV R1, x+0(FP)
832 MOVV R2, y+8(FP)
833 JMP runtime·goPanicSliceB(SB)
834 TEXT runtime·panicSliceBU(SB),NOSPLIT,$0-16
835 MOVV R1, x+0(FP)
836 MOVV R2, y+8(FP)
837 JMP runtime·goPanicSliceBU(SB)
838 TEXT runtime·panicSlice3Alen(SB),NOSPLIT,$0-16
839 MOVV R3, x+0(FP)
840 MOVV R4, y+8(FP)
841 JMP runtime·goPanicSlice3Alen(SB)
842 TEXT runtime·panicSlice3AlenU(SB),NOSPLIT,$0-16
843 MOVV R3, x+0(FP)
844 MOVV R4, y+8(FP)
845 JMP runtime·goPanicSlice3AlenU(SB)
846 TEXT runtime·panicSlice3Acap(SB),NOSPLIT,$0-16
847 MOVV R3, x+0(FP)
848 MOVV R4, y+8(FP)
849 JMP runtime·goPanicSlice3Acap(SB)
850 TEXT runtime·panicSlice3AcapU(SB),NOSPLIT,$0-16
851 MOVV R3, x+0(FP)
852 MOVV R4, y+8(FP)
853 JMP runtime·goPanicSlice3AcapU(SB)
854 TEXT runtime·panicSlice3B(SB),NOSPLIT,$0-16
855 MOVV R2, x+0(FP)
856 MOVV R3, y+8(FP)
857 JMP runtime·goPanicSlice3B(SB)
858 TEXT runtime·panicSlice3BU(SB),NOSPLIT,$0-16
859 MOVV R2, x+0(FP)
860 MOVV R3, y+8(FP)
861 JMP runtime·goPanicSlice3BU(SB)
862 TEXT runtime·panicSlice3C(SB),NOSPLIT,$0-16
863 MOVV R1, x+0(FP)
864 MOVV R2, y+8(FP)
865 JMP runtime·goPanicSlice3C(SB)
866 TEXT runtime·panicSlice3CU(SB),NOSPLIT,$0-16
867 MOVV R1, x+0(FP)
868 MOVV R2, y+8(FP)
869 JMP runtime·goPanicSlice3CU(SB)
870 TEXT runtime·panicSliceConvert(SB),NOSPLIT,$0-16
871 MOVV R3, x+0(FP)
872 MOVV R4, y+8(FP)
873 JMP runtime·goPanicSliceConvert(SB)
874
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