// Copyright 2016 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

//go:build mips || mipsle

#include "go_asm.h"

#include "go_tls.h"

#include "funcdata.h"

#include "textflag.h"

#define REGCTXT R22

TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0

// R29 = stack; R4 = argc; R5 = argv

ADDU $-12, R29

MOVW R4, 4(R29) // argc

MOVW R5, 8(R29) // argv

// create istack out of the given (operating system) stack.

// _cgo_init may update stackguard.

MOVW $runtime·g0(SB), g

MOVW $(-64*1024), R23

ADD R23, R29, R1

MOVW R1, g_stackguard0(g)

MOVW R1, g_stackguard1(g)

MOVW R1, (g_stack+stack_lo)(g)

MOVW R29, (g_stack+stack_hi)(g)

// if there is a _cgo_init, call it using the gcc ABI.

MOVW _cgo_init(SB), R25

BEQ R25, nocgo

ADDU $-16, R29

MOVW R0, R7 // arg 3: not used

MOVW R0, R6 // arg 2: not used

MOVW $setg_gcc<>(SB), R5 // arg 1: setg

MOVW g, R4 // arg 0: G

JAL (R25)

ADDU $16, R29

nocgo:

// update stackguard after _cgo_init

MOVW (g_stack+stack_lo)(g), R1

ADD $const_stackGuard, R1

MOVW R1, g_stackguard0(g)

MOVW R1, g_stackguard1(g)

// set the per-goroutine and per-mach "registers"

MOVW $runtime·m0(SB), R1

// save m->g0 = g0

MOVW g, m_g0(R1)

// save m0 to g0->m

MOVW R1, g_m(g)

JAL runtime·check(SB)

// args are already prepared

JAL runtime·args(SB)

JAL runtime·osinit(SB)

JAL runtime·schedinit(SB)

// create a new goroutine to start program

MOVW $runtime·mainPC(SB), R1 // entry

ADDU $-8, R29

MOVW R1, 4(R29)

MOVW R0, 0(R29)

JAL runtime·newproc(SB)

ADDU $8, R29

// start this M

JAL runtime·mstart(SB)

UNDEF

RET

DATA runtime·mainPC+0(SB)/4,$runtime·main(SB)

GLOBL runtime·mainPC(SB),RODATA,$4

TEXT runtime·breakpoint(SB),NOSPLIT,$0-0

BREAK

RET

TEXT runtime·asminit(SB),NOSPLIT,$0-0

RET

TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0

JAL runtime·mstart0(SB)

RET // not reached

/*

* go-routine

*/

// void gogo(Gobuf*)

// restore state from Gobuf; longjmp

TEXT runtime·gogo(SB),NOSPLIT|NOFRAME,$0-4

MOVW buf+0(FP), R3

MOVW gobuf_g(R3), R4

MOVW 0(R4), R5 // make sure g != nil

JMP gogo<>(SB)

TEXT gogo<>(SB),NOSPLIT|NOFRAME,$0

MOVW R4, g

JAL runtime·save_g(SB)

MOVW gobuf_sp(R3), R29

MOVW gobuf_lr(R3), R31

MOVW gobuf_ret(R3), R1

MOVW gobuf_ctxt(R3), REGCTXT

MOVW R0, gobuf_sp(R3)

MOVW R0, gobuf_ret(R3)

MOVW R0, gobuf_lr(R3)

MOVW R0, gobuf_ctxt(R3)

MOVW gobuf_pc(R3), R4

JMP (R4)

// void mcall(fn func(*g))

// Switch to m->g0's stack, call fn(g).

// Fn must never return. It should gogo(&g->sched)

// to keep running g.

TEXT runtime·mcall(SB),NOSPLIT|NOFRAME,$0-4

// Save caller state in g->sched

MOVW R29, (g_sched+gobuf_sp)(g)

MOVW R31, (g_sched+gobuf_pc)(g)

MOVW R0, (g_sched+gobuf_lr)(g)

// Switch to m->g0 & its stack, call fn.

MOVW g, R1

MOVW g_m(g), R3

MOVW m_g0(R3), g

JAL runtime·save_g(SB)

BNE g, R1, 2(PC)

JMP runtime·badmcall(SB)

MOVW fn+0(FP), REGCTXT // context

MOVW 0(REGCTXT), R4 // code pointer

MOVW (g_sched+gobuf_sp)(g), R29 // sp = m->g0->sched.sp

ADDU $-8, R29 // make room for 1 arg and fake LR

MOVW R1, 4(R29)

MOVW R0, 0(R29)

JAL (R4)

JMP runtime·badmcall2(SB)

// systemstack_switch is a dummy routine that systemstack leaves at the bottom

// of the G stack. We need to distinguish the routine that

// lives at the bottom of the G stack from the one that lives

// at the top of the system stack because the one at the top of

// the system stack terminates the stack walk (see topofstack()).

TEXT runtime·systemstack_switch(SB),NOSPLIT,$0-0

UNDEF

JAL (R31) // make sure this function is not leaf

RET

// func systemstack(fn func())

TEXT runtime·systemstack(SB),NOSPLIT,$0-4

MOVW fn+0(FP), R1 // R1 = fn

MOVW R1, REGCTXT // context

MOVW g_m(g), R2 // R2 = m

MOVW m_gsignal(R2), R3 // R3 = gsignal

BEQ g, R3, noswitch

MOVW m_g0(R2), R3 // R3 = g0

BEQ g, R3, noswitch

MOVW m_curg(R2), R4

BEQ g, R4, switch

// Bad: g is not gsignal, not g0, not curg. What is it?

// Hide call from linker nosplit analysis.

MOVW $runtime·badsystemstack(SB), R4

JAL (R4)

JAL runtime·abort(SB)

switch:

// save our state in g->sched. Pretend to

// be systemstack_switch if the G stack is scanned.

JAL gosave_systemstack_switch<>(SB)

// switch to g0

MOVW R3, g

JAL runtime·save_g(SB)

MOVW (g_sched+gobuf_sp)(g), R1

MOVW R1, R29

// call target function

MOVW 0(REGCTXT), R4 // code pointer

JAL (R4)

// switch back to g

MOVW g_m(g), R1

MOVW m_curg(R1), g

JAL runtime·save_g(SB)

MOVW (g_sched+gobuf_sp)(g), R29

MOVW R0, (g_sched+gobuf_sp)(g)

RET

noswitch:

// already on m stack, just call directly

// Using a tail call here cleans up tracebacks since we won't stop

// at an intermediate systemstack.

MOVW 0(REGCTXT), R4 // code pointer

MOVW 0(R29), R31 // restore LR

ADD $4, R29

JMP (R4)

// func switchToCrashStack0(fn func())

TEXT runtime·switchToCrashStack0(SB), NOSPLIT, $0-4

MOVW fn+0(FP), REGCTXT // context register

MOVW g_m(g), R2 // curm

// set g to gcrash

MOVW $runtime·gcrash(SB), g // g = &gcrash

CALL runtime·save_g(SB)

MOVW R2, g_m(g) // g.m = curm

MOVW g, m_g0(R2) // curm.g0 = g

// switch to crashstack

MOVW (g_stack+stack_hi)(g), R2

ADDU $(-4*8), R2, R29

// call target function

MOVW 0(REGCTXT), R25

JAL (R25)

// should never return

CALL runtime·abort(SB)

UNDEF

/*

* support for morestack

*/

// Called during function prolog when more stack is needed.

// Caller has already loaded:

// R1: framesize, R2: argsize, R3: LR

//

// The traceback routines see morestack on a g0 as being

// the top of a stack (for example, morestack calling newstack

// calling the scheduler calling newm calling gc), so we must

// record an argument size. For that purpose, it has no arguments.

TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0

// Called from f.

// Set g->sched to context in f.

MOVW R29, (g_sched+gobuf_sp)(g)

MOVW R31, (g_sched+gobuf_pc)(g)

MOVW R3, (g_sched+gobuf_lr)(g)

MOVW REGCTXT, (g_sched+gobuf_ctxt)(g)

// Cannot grow scheduler stack (m->g0).

MOVW g_m(g), R7

MOVW m_g0(R7), R8

BNE g, R8, 3(PC)

JAL runtime·badmorestackg0(SB)

JAL runtime·abort(SB)

// Cannot grow signal stack (m->gsignal).

MOVW m_gsignal(R7), R8

BNE g, R8, 3(PC)

JAL runtime·badmorestackgsignal(SB)

JAL runtime·abort(SB)

// Called from f.

// Set m->morebuf to f's caller.

MOVW R3, (m_morebuf+gobuf_pc)(R7) // f's caller's PC

MOVW R29, (m_morebuf+gobuf_sp)(R7) // f's caller's SP

MOVW g, (m_morebuf+gobuf_g)(R7)

// Call newstack on m->g0's stack.

MOVW m_g0(R7), g

JAL runtime·save_g(SB)

MOVW (g_sched+gobuf_sp)(g), R29

// Create a stack frame on g0 to call newstack.

MOVW R0, -4(R29) // Zero saved LR in frame

ADDU $-4, R29

JAL runtime·newstack(SB)

// Not reached, but make sure the return PC from the call to newstack

// is still in this function, and not the beginning of the next.

UNDEF

TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0-0

// Force SPWRITE. This function doesn't actually write SP,

// but it is called with a special calling convention where

// the caller doesn't save LR on stack but passes it as a

// register (R3), and the unwinder currently doesn't understand.

// Make it SPWRITE to stop unwinding. (See issue 54332)

MOVW R29, R29

MOVW R0, REGCTXT

JMP runtime·morestack(SB)

// reflectcall: call a function with the given argument list

// func call(stackArgsType *_type, f *FuncVal, stackArgs *byte, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs).

// we don't have variable-sized frames, so we use a small number

// of constant-sized-frame functions to encode a few bits of size in the pc.

#define DISPATCH(NAME,MAXSIZE) \

MOVW $MAXSIZE, R23; \

SGTU R1, R23, R23; \

BNE R23, 3(PC); \

MOVW $NAME(SB), R4; \

JMP (R4)

TEXT ·reflectcall(SB),NOSPLIT|NOFRAME,$0-28

MOVW frameSize+20(FP), R1

DISPATCH(runtime·call16, 16)

DISPATCH(runtime·call32, 32)

DISPATCH(runtime·call64, 64)

DISPATCH(runtime·call128, 128)

DISPATCH(runtime·call256, 256)

DISPATCH(runtime·call512, 512)

DISPATCH(runtime·call1024, 1024)

DISPATCH(runtime·call2048, 2048)

DISPATCH(runtime·call4096, 4096)

DISPATCH(runtime·call8192, 8192)

DISPATCH(runtime·call16384, 16384)

DISPATCH(runtime·call32768, 32768)

DISPATCH(runtime·call65536, 65536)

DISPATCH(runtime·call131072, 131072)

DISPATCH(runtime·call262144, 262144)

DISPATCH(runtime·call524288, 524288)

DISPATCH(runtime·call1048576, 1048576)

DISPATCH(runtime·call2097152, 2097152)

DISPATCH(runtime·call4194304, 4194304)

DISPATCH(runtime·call8388608, 8388608)

DISPATCH(runtime·call16777216, 16777216)

DISPATCH(runtime·call33554432, 33554432)

DISPATCH(runtime·call67108864, 67108864)

DISPATCH(runtime·call134217728, 134217728)

DISPATCH(runtime·call268435456, 268435456)

DISPATCH(runtime·call536870912, 536870912)

DISPATCH(runtime·call1073741824, 1073741824)

MOVW $runtime·badreflectcall(SB), R4

JMP (R4)

#define CALLFN(NAME,MAXSIZE) \

TEXT NAME(SB),WRAPPER,$MAXSIZE-28; \

NO_LOCAL_POINTERS; \

/* copy arguments to stack */ \

MOVW stackArgs+8(FP), R1; \

MOVW stackArgsSize+12(FP), R2; \

MOVW R29, R3; \

ADDU $4, R3; \

ADDU R3, R2; \

BEQ R3, R2, 6(PC); \

MOVBU (R1), R4; \

ADDU $1, R1; \

MOVBU R4, (R3); \

ADDU $1, R3; \

JMP -5(PC); \

/* call function */ \

MOVW f+4(FP), REGCTXT; \

MOVW (REGCTXT), R4; \

PCDATA $PCDATA_StackMapIndex, $0; \

JAL (R4); \

/* copy return values back */ \

MOVW stackArgsType+0(FP), R5; \

MOVW stackArgs+8(FP), R1; \

MOVW stackArgsSize+12(FP), R2; \

MOVW stackRetOffset+16(FP), R4; \

ADDU $4, R29, R3; \

ADDU R4, R3; \

ADDU R4, R1; \

SUBU R4, R2; \

JAL callRet<>(SB); \

RET

// callRet copies return values back at the end of call*. This is a

// separate function so it can allocate stack space for the arguments

// to reflectcallmove. It does not follow the Go ABI; it expects its

// arguments in registers.

TEXT callRet<>(SB), NOSPLIT, $20-0

MOVW R5, 4(R29)

MOVW R1, 8(R29)

MOVW R3, 12(R29)

MOVW R2, 16(R29)

MOVW $0, 20(R29)

JAL runtime·reflectcallmove(SB)

RET

CALLFN(·call16, 16)

CALLFN(·call32, 32)

CALLFN(·call64, 64)

CALLFN(·call128, 128)

CALLFN(·call256, 256)

CALLFN(·call512, 512)

CALLFN(·call1024, 1024)

CALLFN(·call2048, 2048)

CALLFN(·call4096, 4096)

CALLFN(·call8192, 8192)

CALLFN(·call16384, 16384)

CALLFN(·call32768, 32768)

CALLFN(·call65536, 65536)

CALLFN(·call131072, 131072)

CALLFN(·call262144, 262144)

CALLFN(·call524288, 524288)

CALLFN(·call1048576, 1048576)

CALLFN(·call2097152, 2097152)

CALLFN(·call4194304, 4194304)

CALLFN(·call8388608, 8388608)

CALLFN(·call16777216, 16777216)

CALLFN(·call33554432, 33554432)

CALLFN(·call67108864, 67108864)

CALLFN(·call134217728, 134217728)

CALLFN(·call268435456, 268435456)

CALLFN(·call536870912, 536870912)

CALLFN(·call1073741824, 1073741824)

TEXT runtime·procyield(SB),NOSPLIT,$0-4

RET

// Save state of caller into g->sched,

// but using fake PC from systemstack_switch.

// Must only be called from functions with no locals ($0)

// or else unwinding from systemstack_switch is incorrect.

// Smashes R1.

TEXT gosave_systemstack_switch<>(SB),NOSPLIT|NOFRAME,$0

MOVW $runtime·systemstack_switch(SB), R1

ADDU $8, R1 // get past prologue

MOVW R1, (g_sched+gobuf_pc)(g)

MOVW R29, (g_sched+gobuf_sp)(g)

MOVW R0, (g_sched+gobuf_lr)(g)

MOVW R0, (g_sched+gobuf_ret)(g)

// Assert ctxt is zero. See func save.

MOVW (g_sched+gobuf_ctxt)(g), R1

BEQ R1, 2(PC)

JAL runtime·abort(SB)

RET

// func asmcgocall(fn, arg unsafe.Pointer) int32

// Call fn(arg) on the scheduler stack,

// aligned appropriately for the gcc ABI.

// See cgocall.go for more details.

TEXT ·asmcgocall(SB),NOSPLIT,$0-12

MOVW fn+0(FP), R25

MOVW arg+4(FP), R4

MOVW R29, R3 // save original stack pointer

MOVW g, R2

// Figure out if we need to switch to m->g0 stack.

// We get called to create new OS threads too, and those

// come in on the m->g0 stack already. Or we might already

// be on the m->gsignal stack.

MOVW g_m(g), R5

MOVW m_gsignal(R5), R6

BEQ R6, g, g0

MOVW m_g0(R5), R6

BEQ R6, g, g0

JAL gosave_systemstack_switch<>(SB)

MOVW R6, g

JAL runtime·save_g(SB)

MOVW (g_sched+gobuf_sp)(g), R29

// Now on a scheduling stack (a pthread-created stack).

g0:

// Save room for two of our pointers and O32 frame.

ADDU $-24, R29

AND $~7, R29 // O32 ABI expects 8-byte aligned stack on function entry

MOVW R2, 16(R29) // save old g on stack

MOVW (g_stack+stack_hi)(R2), R2

SUBU R3, R2

MOVW R2, 20(R29) // save depth in old g stack (can't just save SP, as stack might be copied during a callback)

JAL (R25)

// Restore g, stack pointer. R2 is return value.

MOVW 16(R29), g

JAL runtime·save_g(SB)

MOVW (g_stack+stack_hi)(g), R5

MOVW 20(R29), R6

SUBU R6, R5

MOVW R5, R29

MOVW R2, ret+8(FP)

RET

// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr)

// See cgocall.go for more details.

TEXT ·cgocallback(SB),NOSPLIT,$12-12

NO_LOCAL_POINTERS

// Skip cgocallbackg, just dropm when fn is nil, and frame is the saved g.

// It is used to dropm while thread is exiting.

MOVW fn+0(FP), R5

BNE R5, loadg

// Restore the g from frame.

MOVW frame+4(FP), g

JMP dropm

loadg:

// Load m and g from thread-local storage.

MOVB runtime·iscgo(SB), R1

BEQ R1, nocgo

JAL runtime·load_g(SB)

nocgo:

// If g is nil, Go did not create the current thread,

// or if this thread never called into Go on pthread platforms.

// Call needm to obtain one for temporary use.

// In this case, we're running on the thread stack, so there's

// lots of space, but the linker doesn't know. Hide the call from

// the linker analysis by using an indirect call.

BEQ g, needm

MOVW g_m(g), R3

MOVW R3, savedm-4(SP)

JMP havem

needm:

MOVW g, savedm-4(SP) // g is zero, so is m.

MOVW $runtime·needAndBindM(SB), R4

JAL (R4)

// Set m->sched.sp = SP, so that if a panic happens

// during the function we are about to execute, it will

// have a valid SP to run on the g0 stack.

// The next few lines (after the havem label)

// will save this SP onto the stack and then write

// the same SP back to m->sched.sp. That seems redundant,

// but if an unrecovered panic happens, unwindm will

// restore the g->sched.sp from the stack location

// and then systemstack will try to use it. If we don't set it here,

// that restored SP will be uninitialized (typically 0) and

// will not be usable.

MOVW g_m(g), R3

MOVW m_g0(R3), R1

MOVW R29, (g_sched+gobuf_sp)(R1)

havem:

// Now there's a valid m, and we're running on its m->g0.

// Save current m->g0->sched.sp on stack and then set it to SP.

// Save current sp in m->g0->sched.sp in preparation for

// switch back to m->curg stack.

// NOTE: unwindm knows that the saved g->sched.sp is at 4(R29) aka savedsp-8(SP).

MOVW m_g0(R3), R1

MOVW (g_sched+gobuf_sp)(R1), R2

MOVW R2, savedsp-12(SP) // must match frame size

MOVW R29, (g_sched+gobuf_sp)(R1)

// Switch to m->curg stack and call runtime.cgocallbackg.

// Because we are taking over the execution of m->curg

// but *not* resuming what had been running, we need to

// save that information (m->curg->sched) so we can restore it.

// We can restore m->curg->sched.sp easily, because calling

// runtime.cgocallbackg leaves SP unchanged upon return.

// To save m->curg->sched.pc, we push it onto the curg stack and

// open a frame the same size as cgocallback's g0 frame.

// Once we switch to the curg stack, the pushed PC will appear

// to be the return PC of cgocallback, so that the traceback

// will seamlessly trace back into the earlier calls.

MOVW m_curg(R3), g

JAL runtime·save_g(SB)

MOVW (g_sched+gobuf_sp)(g), R2 // prepare stack as R2

MOVW (g_sched+gobuf_pc)(g), R4

MOVW R4, -(12+4)(R2) // "saved LR"; must match frame size

// Gather our arguments into registers.

MOVW fn+0(FP), R5

MOVW frame+4(FP), R6

MOVW ctxt+8(FP), R7

MOVW $-(12+4)(R2), R29 // switch stack; must match frame size

MOVW R5, 4(R29)

MOVW R6, 8(R29)

MOVW R7, 12(R29)

JAL runtime·cgocallbackg(SB)

// Restore g->sched (== m->curg->sched) from saved values.

MOVW 0(R29), R4

MOVW R4, (g_sched+gobuf_pc)(g)

MOVW $(12+4)(R29), R2 // must match frame size

MOVW R2, (g_sched+gobuf_sp)(g)

// Switch back to m->g0's stack and restore m->g0->sched.sp.

// (Unlike m->curg, the g0 goroutine never uses sched.pc,

// so we do not have to restore it.)

MOVW g_m(g), R3

MOVW m_g0(R3), g

JAL runtime·save_g(SB)

MOVW (g_sched+gobuf_sp)(g), R29

MOVW savedsp-12(SP), R2 // must match frame size

MOVW R2, (g_sched+gobuf_sp)(g)

// If the m on entry was nil, we called needm above to borrow an m,

// 1. for the duration of the call on non-pthread platforms,

// 2. or the duration of the C thread alive on pthread platforms.

// If the m on entry wasn't nil,

// 1. the thread might be a Go thread,

// 2. or it wasn't the first call from a C thread on pthread platforms,

// since then we skip dropm to reuse the m in the first call.

MOVW savedm-4(SP), R3

BNE R3, droppedm

// Skip dropm to reuse it in the next call, when a pthread key has been created.

MOVW _cgo_pthread_key_created(SB), R3

// It means cgo is disabled when _cgo_pthread_key_created is a nil pointer, need dropm.

BEQ R3, dropm

MOVW (R3), R3

BNE R3, droppedm

dropm:

MOVW $runtime·dropm(SB), R4

JAL (R4)

droppedm:

// Done!

RET

// void setg(G*); set g. for use by needm.

// This only happens if iscgo, so jump straight to save_g

TEXT runtime·setg(SB),NOSPLIT,$0-4

MOVW gg+0(FP), g

JAL runtime·save_g(SB)

RET

// void setg_gcc(G*); set g in C TLS.

// Must obey the gcc calling convention.

TEXT setg_gcc<>(SB),NOSPLIT,$0

MOVW R4, g

JAL runtime·save_g(SB)

RET

TEXT runtime·abort(SB),NOSPLIT,$0-0

UNDEF

// AES hashing not implemented for mips

TEXT runtime·memhash(SB),NOSPLIT|NOFRAME,$0-16

JMP runtime·memhashFallback(SB)

TEXT runtime·strhash(SB),NOSPLIT|NOFRAME,$0-12

JMP runtime·strhashFallback(SB)

TEXT runtime·memhash32(SB),NOSPLIT|NOFRAME,$0-12

JMP runtime·memhash32Fallback(SB)

TEXT runtime·memhash64(SB),NOSPLIT|NOFRAME,$0-12

JMP runtime·memhash64Fallback(SB)

TEXT runtime·return0(SB),NOSPLIT,$0

MOVW $0, R1

RET

// Called from cgo wrappers, this function returns g->m->curg.stack.hi.

// Must obey the gcc calling convention.

TEXT _cgo_topofstack(SB),NOSPLIT|NOFRAME,$0

// g (R30), R3 and REGTMP (R23) might be clobbered by load_g. R30 and R23

// are callee-save in the gcc calling convention, so save them.

MOVW R23, R8

MOVW g, R9

MOVW R31, R10 // this call frame does not save LR

JAL runtime·load_g(SB)

MOVW g_m(g), R1

MOVW m_curg(R1), R1

MOVW (g_stack+stack_hi)(R1), R2 // return value in R2

MOVW R8, R23

MOVW R9, g

MOVW R10, R31

RET

// The top-most function running on a goroutine

// returns to goexit+PCQuantum.

TEXT runtime·goexit(SB),NOSPLIT|NOFRAME|TOPFRAME,$0-0

NOR R0, R0 // NOP

JAL runtime·goexit1(SB) // does not return

// traceback from goexit1 must hit code range of goexit

NOR R0, R0 // NOP

TEXT ·checkASM(SB),NOSPLIT,$0-1

MOVW $1, R1

MOVB R1, ret+0(FP)

RET

// gcWriteBarrier informs the GC about heap pointer writes.

//

// gcWriteBarrier does NOT follow the Go ABI. It accepts the

// number of bytes of buffer needed in R25, and returns a pointer

// to the buffer space in R25.

// It clobbers R23 (the linker temp register).

// The act of CALLing gcWriteBarrier will clobber R31 (LR).

// It does not clobber any other general-purpose registers,

// but may clobber others (e.g., floating point registers).

TEXT gcWriteBarrier<>(SB),NOSPLIT,$104

// Save the registers clobbered by the fast path.

MOVW R1, 100(R29)

MOVW R2, 104(R29)

retry:

MOVW g_m(g), R1

MOVW m_p(R1), R1

MOVW (p_wbBuf+wbBuf_next)(R1), R2

MOVW (p_wbBuf+wbBuf_end)(R1), R23 // R23 is linker temp register

// Increment wbBuf.next position.

ADD R25, R2

// Is the buffer full?

SGTU R2, R23, R23

BNE R23, flush

// Commit to the larger buffer.

MOVW R2, (p_wbBuf+wbBuf_next)(R1)

// Make return value (the original next position)

SUB R25, R2, R25

// Restore registers.

MOVW 100(R29), R1

MOVW 104(R29), R2

RET

flush:

// Save all general purpose registers since these could be

// clobbered by wbBufFlush and were not saved by the caller.

MOVW R20, 4(R29)

MOVW R21, 8(R29)

// R1 already saved

// R2 already saved

MOVW R3, 12(R29)

MOVW R4, 16(R29)

MOVW R5, 20(R29)

MOVW R6, 24(R29)

MOVW R7, 28(R29)

MOVW R8, 32(R29)

MOVW R9, 36(R29)

MOVW R10, 40(R29)

MOVW R11, 44(R29)

MOVW R12, 48(R29)

MOVW R13, 52(R29)

MOVW R14, 56(R29)

MOVW R15, 60(R29)

MOVW R16, 64(R29)

MOVW R17, 68(R29)

MOVW R18, 72(R29)

MOVW R19, 76(R29)

MOVW R20, 80(R29)

// R21 already saved

// R22 already saved.

MOVW R22, 84(R29)

// R23 is tmp register.

MOVW R24, 88(R29)

MOVW R25, 92(R29)

// R26 is reserved by kernel.

// R27 is reserved by kernel.

MOVW R28, 96(R29)

// R29 is SP.

// R30 is g.

// R31 is LR, which was saved by the prologue.

CALL runtime·wbBufFlush(SB)

MOVW 4(R29), R20

MOVW 8(R29), R21

MOVW 12(R29), R3

MOVW 16(R29), R4

MOVW 20(R29), R5

MOVW 24(R29), R6

MOVW 28(R29), R7

MOVW 32(R29), R8

MOVW 36(R29), R9

MOVW 40(R29), R10

MOVW 44(R29), R11

MOVW 48(R29), R12

MOVW 52(R29), R13

MOVW 56(R29), R14

MOVW 60(R29), R15

MOVW 64(R29), R16

MOVW 68(R29), R17

MOVW 72(R29), R18

MOVW 76(R29), R19

MOVW 80(R29), R20

MOVW 84(R29), R22

MOVW 88(R29), R24

MOVW 92(R29), R25

MOVW 96(R29), R28

JMP retry

TEXT runtime·gcWriteBarrier1<ABIInternal>(SB),NOSPLIT,$0

MOVW $4, R25

JMP gcWriteBarrier<>(SB)

TEXT runtime·gcWriteBarrier2<ABIInternal>(SB),NOSPLIT,$0

MOVW $8, R25

JMP gcWriteBarrier<>(SB)

TEXT runtime·gcWriteBarrier3<ABIInternal>(SB),NOSPLIT,$0

MOVW $12, R25

JMP gcWriteBarrier<>(SB)

TEXT runtime·gcWriteBarrier4<ABIInternal>(SB),NOSPLIT,$0

MOVW $16, R25

JMP gcWriteBarrier<>(SB)

TEXT runtime·gcWriteBarrier5<ABIInternal>(SB),NOSPLIT,$0

MOVW $20, R25

JMP gcWriteBarrier<>(SB)

TEXT runtime·gcWriteBarrier6<ABIInternal>(SB),NOSPLIT,$0

MOVW $24, R25

JMP gcWriteBarrier<>(SB)

TEXT runtime·gcWriteBarrier7<ABIInternal>(SB),NOSPLIT,$0

MOVW $28, R25

JMP gcWriteBarrier<>(SB)

TEXT runtime·gcWriteBarrier8<ABIInternal>(SB),NOSPLIT,$0

MOVW $32, R25

JMP gcWriteBarrier<>(SB)

// Note: these functions use a special calling convention to save generated code space.

// Arguments are passed in registers, but the space for those arguments are allocated

// in the caller's stack frame. These stubs write the args into that stack space and

// then tail call to the corresponding runtime handler.

// The tail call makes these stubs disappear in backtraces.

TEXT runtime·panicIndex(SB),NOSPLIT,$0-8

MOVW R1, x+0(FP)

MOVW R2, y+4(FP)

JMP runtime·goPanicIndex(SB)

TEXT runtime·panicIndexU(SB),NOSPLIT,$0-8

MOVW R1, x+0(FP)

MOVW R2, y+4(FP)

JMP runtime·goPanicIndexU(SB)

TEXT runtime·panicSliceAlen(SB),NOSPLIT,$0-8

MOVW R2, x+0(FP)

MOVW R3, y+4(FP)

JMP runtime·goPanicSliceAlen(SB)

TEXT runtime·panicSliceAlenU(SB),NOSPLIT,$0-8

MOVW R2, x+0(FP)

MOVW R3, y+4(FP)

JMP runtime·goPanicSliceAlenU(SB)

TEXT runtime·panicSliceAcap(SB),NOSPLIT,$0-8

MOVW R2, x+0(FP)

MOVW R3, y+4(FP)

JMP runtime·goPanicSliceAcap(SB)

TEXT runtime·panicSliceAcapU(SB),NOSPLIT,$0-8

MOVW R2, x+0(FP)

MOVW R3, y+4(FP)

JMP runtime·goPanicSliceAcapU(SB)

TEXT runtime·panicSliceB(SB),NOSPLIT,$0-8

MOVW R1, x+0(FP)

MOVW R2, y+4(FP)

JMP runtime·goPanicSliceB(SB)

TEXT runtime·panicSliceBU(SB),NOSPLIT,$0-8

MOVW R1, x+0(FP)

MOVW R2, y+4(FP)

JMP runtime·goPanicSliceBU(SB)

TEXT runtime·panicSlice3Alen(SB),NOSPLIT,$0-8

MOVW R3, x+0(FP)

MOVW R4, y+4(FP)

JMP runtime·goPanicSlice3Alen(SB)

TEXT runtime·panicSlice3AlenU(SB),NOSPLIT,$0-8

MOVW R3, x+0(FP)

MOVW R4, y+4(FP)

JMP runtime·goPanicSlice3AlenU(SB)

TEXT runtime·panicSlice3Acap(SB),NOSPLIT,$0-8

MOVW R3, x+0(FP)

MOVW R4, y+4(FP)

JMP runtime·goPanicSlice3Acap(SB)

TEXT runtime·panicSlice3AcapU(SB),NOSPLIT,$0-8

MOVW R3, x+0(FP)

MOVW R4, y+4(FP)

JMP runtime·goPanicSlice3AcapU(SB)

TEXT runtime·panicSlice3B(SB),NOSPLIT,$0-8

MOVW R2, x+0(FP)

MOVW R3, y+4(FP)

JMP runtime·goPanicSlice3B(SB)

TEXT runtime·panicSlice3BU(SB),NOSPLIT,$0-8

MOVW R2, x+0(FP)

MOVW R3, y+4(FP)

JMP runtime·goPanicSlice3BU(SB)

TEXT runtime·panicSlice3C(SB),NOSPLIT,$0-8

MOVW R1, x+0(FP)

MOVW R2, y+4(FP)

JMP runtime·goPanicSlice3C(SB)

TEXT runtime·panicSlice3CU(SB),NOSPLIT,$0-8

MOVW R1, x+0(FP)

MOVW R2, y+4(FP)

JMP runtime·goPanicSlice3CU(SB)

TEXT runtime·panicSliceConvert(SB),NOSPLIT,$0-8

MOVW R3, x+0(FP)

MOVW R4, y+4(FP)

JMP runtime·goPanicSliceConvert(SB)

// Extended versions for 64-bit indexes.

TEXT runtime·panicExtendIndex(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R1, lo+4(FP)

MOVW R2, y+8(FP)

JMP runtime·goPanicExtendIndex(SB)

TEXT runtime·panicExtendIndexU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R1, lo+4(FP)

MOVW R2, y+8(FP)

JMP runtime·goPanicExtendIndexU(SB)

TEXT runtime·panicExtendSliceAlen(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R2, lo+4(FP)

MOVW R3, y+8(FP)

JMP runtime·goPanicExtendSliceAlen(SB)

TEXT runtime·panicExtendSliceAlenU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R2, lo+4(FP)

MOVW R3, y+8(FP)

JMP runtime·goPanicExtendSliceAlenU(SB)

TEXT runtime·panicExtendSliceAcap(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R2, lo+4(FP)

MOVW R3, y+8(FP)

JMP runtime·goPanicExtendSliceAcap(SB)

TEXT runtime·panicExtendSliceAcapU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R2, lo+4(FP)

MOVW R3, y+8(FP)

JMP runtime·goPanicExtendSliceAcapU(SB)

TEXT runtime·panicExtendSliceB(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R1, lo+4(FP)

MOVW R2, y+8(FP)

JMP runtime·goPanicExtendSliceB(SB)

TEXT runtime·panicExtendSliceBU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R1, lo+4(FP)

MOVW R2, y+8(FP)

JMP runtime·goPanicExtendSliceBU(SB)

TEXT runtime·panicExtendSlice3Alen(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R3, lo+4(FP)

MOVW R4, y+8(FP)

JMP runtime·goPanicExtendSlice3Alen(SB)

TEXT runtime·panicExtendSlice3AlenU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R3, lo+4(FP)

MOVW R4, y+8(FP)

JMP runtime·goPanicExtendSlice3AlenU(SB)

TEXT runtime·panicExtendSlice3Acap(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R3, lo+4(FP)

MOVW R4, y+8(FP)

JMP runtime·goPanicExtendSlice3Acap(SB)

TEXT runtime·panicExtendSlice3AcapU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R3, lo+4(FP)

MOVW R4, y+8(FP)

JMP runtime·goPanicExtendSlice3AcapU(SB)

TEXT runtime·panicExtendSlice3B(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R2, lo+4(FP)

MOVW R3, y+8(FP)

JMP runtime·goPanicExtendSlice3B(SB)

TEXT runtime·panicExtendSlice3BU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R2, lo+4(FP)

MOVW R3, y+8(FP)

JMP runtime·goPanicExtendSlice3BU(SB)

TEXT runtime·panicExtendSlice3C(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R1, lo+4(FP)

MOVW R2, y+8(FP)

JMP runtime·goPanicExtendSlice3C(SB)

TEXT runtime·panicExtendSlice3CU(SB),NOSPLIT,$0-12

MOVW R5, hi+0(FP)

MOVW R1, lo+4(FP)

MOVW R2, y+8(FP)

JMP runtime·goPanicExtendSlice3CU(SB)