src/runtime/asm_wasm.s - go - Git at Google

 // Copyright 2018 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.

 #include "go_asm.h"
 #include "go_tls.h"
 #include "funcdata.h"
 #include "textflag.h"

 TEXT runtime·rt0_go(SB), NOSPLIT|NOFRAME|TOPFRAME, $0
 	// save m->g0 = g0
 	MOVD $runtime·g0(SB), runtime·m0+m_g0(SB)
 	// save m0 to g0->m
 	MOVD $runtime·m0(SB), runtime·g0+g_m(SB)
 	// set g to g0
 	MOVD $runtime·g0(SB), g
 	CALLNORESUME runtime·check(SB)
 	CALLNORESUME runtime·args(SB)
 	CALLNORESUME runtime·osinit(SB)
 	CALLNORESUME runtime·schedinit(SB)
 	MOVD $runtime·mainPC(SB), 0(SP)
 	CALLNORESUME runtime·newproc(SB)
 	CALL runtime·mstart(SB) // WebAssembly stack will unwind when switching to another goroutine
 	UNDEF

 TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0
 	CALL	runtime·mstart0(SB)
 	RET // not reached

 DATA  runtime·mainPC+0(SB)/8,$runtime·main(SB)
 GLOBL runtime·mainPC(SB),RODATA,$8

 // func checkASM() bool
 TEXT ·checkASM(SB), NOSPLIT, $0-1
 	MOVB $1, ret+0(FP)
 	RET

 TEXT runtime·gogo(SB), NOSPLIT, $0-8
 	MOVD buf+0(FP), R0
 	MOVD gobuf_g(R0), R1
 	MOVD 0(R1), R2	// make sure g != nil
 	MOVD R1, g
 	MOVD gobuf_sp(R0), SP

 	// Put target PC at -8(SP), wasm_pc_f_loop will pick it up
 	Get SP
 	I32Const $8
 	I32Sub
 	I64Load gobuf_pc(R0)
 	I64Store $0

 	MOVD gobuf_ret(R0), RET0
 	MOVD gobuf_ctxt(R0), CTXT
 	// clear to help garbage collector
 	MOVD $0, gobuf_sp(R0)
 	MOVD $0, gobuf_ret(R0)
 	MOVD $0, gobuf_ctxt(R0)

 	I32Const $1
 	Return

 // func 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, $0-8
 	// CTXT = fn
 	MOVD fn+0(FP), CTXT
 	// R1 = g.m
 	MOVD g_m(g), R1
 	// R2 = g0
 	MOVD m_g0(R1), R2

 	// save state in g->sched
 	MOVD 0(SP), g_sched+gobuf_pc(g)     // caller's PC
 	MOVD $fn+0(FP), g_sched+gobuf_sp(g) // caller's SP

 	// if g == g0 call badmcall
 	Get g
 	Get R2
 	I64Eq
 	If
 		JMP runtime·badmcall(SB)
 	End

 	// switch to g0's stack
 	I64Load (g_sched+gobuf_sp)(R2)
 	I64Const $8
 	I64Sub
 	I32WrapI64
 	Set SP

 	// set arg to current g
 	MOVD g, 0(SP)

 	// switch to g0
 	MOVD R2, g

 	// call fn
 	Get CTXT
 	I32WrapI64
 	I64Load $0
 	CALL

 	Get SP
 	I32Const $8
 	I32Add
 	Set SP

 	JMP runtime·badmcall2(SB)

 // func systemstack(fn func())
 TEXT runtime·systemstack(SB), NOSPLIT, $0-8
 	// R0 = fn
 	MOVD fn+0(FP), R0
 	// R1 = g.m
 	MOVD g_m(g), R1
 	// R2 = g0
 	MOVD m_g0(R1), R2

 	// if g == g0
 	Get g
 	Get R2
 	I64Eq
 	If
 		// no switch:
 		MOVD R0, CTXT

 		Get CTXT
 		I32WrapI64
 		I64Load $0
 		JMP
 	End

 	// if g != m.curg
 	Get g
 	I64Load m_curg(R1)
 	I64Ne
 	If
 		CALLNORESUME runtime·badsystemstack(SB)
 	End

 	// switch:

 	// save state in g->sched. Pretend to
 	// be systemstack_switch if the G stack is scanned.
 	MOVD $runtime·systemstack_switch(SB), g_sched+gobuf_pc(g)

 	MOVD SP, g_sched+gobuf_sp(g)

 	// switch to g0
 	MOVD R2, g

 	// make it look like mstart called systemstack on g0, to stop traceback
 	I64Load (g_sched+gobuf_sp)(R2)
 	I64Const $8
 	I64Sub
 	Set R3

 	MOVD $runtime·mstart(SB), 0(R3)
 	MOVD R3, SP

 	// call fn
 	MOVD R0, CTXT

 	Get CTXT
 	I32WrapI64
 	I64Load $0
 	CALL

 	// switch back to g
 	MOVD g_m(g), R1
 	MOVD m_curg(R1), R2
 	MOVD R2, g
 	MOVD g_sched+gobuf_sp(R2), SP
 	MOVD $0, g_sched+gobuf_sp(R2)
 	RET

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

 // AES hashing not implemented for wasm
 TEXT runtime·memhash(SB),NOSPLIT|NOFRAME,$0-32
 	JMP	runtime·memhashFallback(SB)
 TEXT runtime·strhash(SB),NOSPLIT|NOFRAME,$0-24
 	JMP	runtime·strhashFallback(SB)
 TEXT runtime·memhash32(SB),NOSPLIT|NOFRAME,$0-24
 	JMP	runtime·memhash32Fallback(SB)
 TEXT runtime·memhash64(SB),NOSPLIT|NOFRAME,$0-24
 	JMP	runtime·memhash64Fallback(SB)

 TEXT runtime·return0(SB), NOSPLIT, $0-0
 	MOVD $0, RET0
 	RET

 TEXT runtime·asminit(SB), NOSPLIT, $0-0
 	// No per-thread init.
 	RET

 TEXT ·publicationBarrier(SB), NOSPLIT, $0-0
 	RET

 TEXT runtime·procyield(SB), NOSPLIT, $0-0 // FIXME
 	RET

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

 // Called during function prolog when more stack is needed.
 //
 // 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, $0-0
 	// R1 = g.m
 	MOVD g_m(g), R1

 	// R2 = g0
 	MOVD m_g0(R1), R2

 	// Cannot grow scheduler stack (m->g0).
 	Get g
 	Get R1
 	I64Eq
 	If
 		CALLNORESUME runtime·badmorestackg0(SB)
 	End

 	// Cannot grow signal stack (m->gsignal).
 	Get g
 	I64Load m_gsignal(R1)
 	I64Eq
 	If
 		CALLNORESUME runtime·badmorestackgsignal(SB)
 	End

 	// Called from f.
 	// Set m->morebuf to f's caller.
 	NOP	SP	// tell vet SP changed - stop checking offsets
 	MOVD 8(SP), m_morebuf+gobuf_pc(R1)
 	MOVD $16(SP), m_morebuf+gobuf_sp(R1) // f's caller's SP
 	MOVD g, m_morebuf+gobuf_g(R1)

 	// Set g->sched to context in f.
 	MOVD 0(SP), g_sched+gobuf_pc(g)
 	MOVD $8(SP), g_sched+gobuf_sp(g) // f's SP
 	MOVD CTXT, g_sched+gobuf_ctxt(g)

 	// Call newstack on m->g0's stack.
 	MOVD R2, g
 	MOVD g_sched+gobuf_sp(R2), SP
 	CALL runtime·newstack(SB)
 	UNDEF // crash if newstack returns

 // morestack but not preserving ctxt.
 TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0
 	MOVD $0, CTXT
 	JMP runtime·morestack(SB)

 TEXT ·asmcgocall(SB), NOSPLIT, $0-0
 	UNDEF

 #define DISPATCH(NAME, MAXSIZE) \
 	Get R0; \
 	I64Const $MAXSIZE; \
 	I64LeU; \
 	If; \
 		JMP NAME(SB); \
 	End

 TEXT ·reflectcall(SB), NOSPLIT, $0-48
 	I64Load fn+8(FP)
 	I64Eqz
 	If
 		CALLNORESUME runtime·sigpanic<ABIInternal>(SB)
 	End

 	MOVW frameSize+32(FP), R0

 	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)
 	JMP runtime·badreflectcall(SB)

 #define CALLFN(NAME, MAXSIZE) \
 TEXT NAME(SB), WRAPPER, $MAXSIZE-48; \
 	NO_LOCAL_POINTERS; \
 	MOVW stackArgsSize+24(FP), R0; \
 	\
 	Get R0; \
 	I64Eqz; \
 	Not; \
 	If; \
 		Get SP; \
 		I64Load stackArgs+16(FP); \
 		I32WrapI64; \
 		I64Load stackArgsSize+24(FP); \
 		I32WrapI64; \
 		MemoryCopy; \
 	End; \
 	\
 	MOVD f+8(FP), CTXT; \
 	Get CTXT; \
 	I32WrapI64; \
 	I64Load $0; \
 	CALL; \
 	\
 	I64Load32U stackRetOffset+28(FP); \
 	Set R0; \
 	\
 	MOVD stackArgsType+0(FP), RET0; \
 	\
 	I64Load stackArgs+16(FP); \
 	Get R0; \
 	I64Add; \
 	Set RET1; \
 	\
 	Get SP; \
 	I64ExtendI32U; \
 	Get R0; \
 	I64Add; \
 	Set RET2; \
 	\
 	I64Load32U stackArgsSize+24(FP); \
 	Get R0; \
 	I64Sub; \
 	Set RET3; \
 	\
 	CALL 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, $40-0
 	NO_LOCAL_POINTERS
 	MOVD RET0, 0(SP)
 	MOVD RET1, 8(SP)
 	MOVD RET2, 16(SP)
 	MOVD RET3, 24(SP)
 	MOVD $0,   32(SP)
 	CALL 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·goexit(SB), NOSPLIT|TOPFRAME, $0-0
 	NOP // first PC of goexit is skipped
 	CALL runtime·goexit1(SB) // does not return
 	UNDEF

 TEXT runtime·cgocallback(SB), NOSPLIT, $0-24
 	UNDEF

 // gcWriteBarrier performs a heap pointer write and informs the GC.
 //
 // gcWriteBarrier does NOT follow the Go ABI. It has two WebAssembly parameters:
 // R0: the destination of the write (i64)
 // R1: the value being written (i64)
 TEXT runtime·gcWriteBarrier(SB), NOSPLIT, $16
 	// R3 = g.m
 	MOVD g_m(g), R3
 	// R4 = p
 	MOVD m_p(R3), R4
 	// R5 = wbBuf.next
 	MOVD p_wbBuf+wbBuf_next(R4), R5

 	// Record value
 	MOVD R1, 0(R5)
 	// Record *slot
 	MOVD (R0), 8(R5)

 	// Increment wbBuf.next
 	Get R5
 	I64Const $16
 	I64Add
 	Set R5
 	MOVD R5, p_wbBuf+wbBuf_next(R4)

 	Get R5
 	I64Load (p_wbBuf+wbBuf_end)(R4)
 	I64Eq
 	If
 		// Flush
 		MOVD R0, 0(SP)
 		MOVD R1, 8(SP)
 		CALLNORESUME runtime·wbBufFlush(SB)
 	End

 	// Do the write
 	MOVD R1, (R0)

 	RET
	// Copyright 2018 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.

	#include "go_asm.h"
	#include "go_tls.h"
	#include "funcdata.h"
	#include "textflag.h"

	TEXT runtime·rt0_go(SB), NOSPLIT\|NOFRAME\|TOPFRAME, $0
	// save m->g0 = g0
	MOVD $runtime·g0(SB), runtime·m0+m_g0(SB)
	// save m0 to g0->m
	MOVD $runtime·m0(SB), runtime·g0+g_m(SB)
	// set g to g0
	MOVD $runtime·g0(SB), g
	CALLNORESUME runtime·check(SB)
	CALLNORESUME runtime·args(SB)
	CALLNORESUME runtime·osinit(SB)
	CALLNORESUME runtime·schedinit(SB)
	MOVD $runtime·mainPC(SB), 0(SP)
	CALLNORESUME runtime·newproc(SB)
	CALL runtime·mstart(SB) // WebAssembly stack will unwind when switching to another goroutine
	UNDEF

	TEXT runtime·mstart(SB),NOSPLIT\|TOPFRAME,$0
	CALL runtime·mstart0(SB)
	RET // not reached

	DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
	GLOBL runtime·mainPC(SB),RODATA,$8

	// func checkASM() bool
	TEXT ·checkASM(SB), NOSPLIT, $0-1
	MOVB $1, ret+0(FP)
	RET

	TEXT runtime·gogo(SB), NOSPLIT, $0-8
	MOVD buf+0(FP), R0
	MOVD gobuf_g(R0), R1
	MOVD 0(R1), R2 // make sure g != nil
	MOVD R1, g
	MOVD gobuf_sp(R0), SP

	// Put target PC at -8(SP), wasm_pc_f_loop will pick it up
	Get SP
	I32Const $8
	I32Sub
	I64Load gobuf_pc(R0)
	I64Store $0

	MOVD gobuf_ret(R0), RET0
	MOVD gobuf_ctxt(R0), CTXT
	// clear to help garbage collector
	MOVD $0, gobuf_sp(R0)
	MOVD $0, gobuf_ret(R0)
	MOVD $0, gobuf_ctxt(R0)

	I32Const $1
	Return

	// func 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, $0-8
	// CTXT = fn
	MOVD fn+0(FP), CTXT
	// R1 = g.m
	MOVD g_m(g), R1
	// R2 = g0
	MOVD m_g0(R1), R2

	// save state in g->sched
	MOVD 0(SP), g_sched+gobuf_pc(g) // caller's PC
	MOVD $fn+0(FP), g_sched+gobuf_sp(g) // caller's SP

	// if g == g0 call badmcall
	Get g
	Get R2
	I64Eq
	If
	JMP runtime·badmcall(SB)
	End

	// switch to g0's stack
	I64Load (g_sched+gobuf_sp)(R2)
	I64Const $8
	I64Sub
	I32WrapI64
	Set SP

	// set arg to current g
	MOVD g, 0(SP)

	// switch to g0
	MOVD R2, g

	// call fn
	Get CTXT
	I32WrapI64
	I64Load $0
	CALL

	Get SP
	I32Const $8
	I32Add
	Set SP

	JMP runtime·badmcall2(SB)

	// func systemstack(fn func())
	TEXT runtime·systemstack(SB), NOSPLIT, $0-8
	// R0 = fn
	MOVD fn+0(FP), R0
	// R1 = g.m
	MOVD g_m(g), R1
	// R2 = g0
	MOVD m_g0(R1), R2

	// if g == g0
	Get g
	Get R2
	I64Eq
	If
	// no switch:
	MOVD R0, CTXT

	Get CTXT
	I32WrapI64
	I64Load $0
	JMP
	End

	// if g != m.curg
	Get g
	I64Load m_curg(R1)
	I64Ne
	If
	CALLNORESUME runtime·badsystemstack(SB)
	End

	// switch:

	// save state in g->sched. Pretend to
	// be systemstack_switch if the G stack is scanned.
	MOVD $runtime·systemstack_switch(SB), g_sched+gobuf_pc(g)

	MOVD SP, g_sched+gobuf_sp(g)

	// switch to g0
	MOVD R2, g

	// make it look like mstart called systemstack on g0, to stop traceback
	I64Load (g_sched+gobuf_sp)(R2)
	I64Const $8
	I64Sub
	Set R3

	MOVD $runtime·mstart(SB), 0(R3)
	MOVD R3, SP

	// call fn
	MOVD R0, CTXT

	Get CTXT
	I32WrapI64
	I64Load $0
	CALL

	// switch back to g
	MOVD g_m(g), R1
	MOVD m_curg(R1), R2
	MOVD R2, g
	MOVD g_sched+gobuf_sp(R2), SP
	MOVD $0, g_sched+gobuf_sp(R2)
	RET

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

	// AES hashing not implemented for wasm
	TEXT runtime·memhash(SB),NOSPLIT\|NOFRAME,$0-32
	JMP runtime·memhashFallback(SB)
	TEXT runtime·strhash(SB),NOSPLIT\|NOFRAME,$0-24
	JMP runtime·strhashFallback(SB)
	TEXT runtime·memhash32(SB),NOSPLIT\|NOFRAME,$0-24
	JMP runtime·memhash32Fallback(SB)
	TEXT runtime·memhash64(SB),NOSPLIT\|NOFRAME,$0-24
	JMP runtime·memhash64Fallback(SB)

	TEXT runtime·return0(SB), NOSPLIT, $0-0
	MOVD $0, RET0
	RET

	TEXT runtime·asminit(SB), NOSPLIT, $0-0
	// No per-thread init.
	RET

	TEXT ·publicationBarrier(SB), NOSPLIT, $0-0
	RET

	TEXT runtime·procyield(SB), NOSPLIT, $0-0 // FIXME
	RET

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

	// Called during function prolog when more stack is needed.
	//
	// 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, $0-0
	// R1 = g.m
	MOVD g_m(g), R1

	// R2 = g0
	MOVD m_g0(R1), R2

	// Cannot grow scheduler stack (m->g0).
	Get g
	Get R1
	I64Eq
	If
	CALLNORESUME runtime·badmorestackg0(SB)
	End

	// Cannot grow signal stack (m->gsignal).
	Get g
	I64Load m_gsignal(R1)
	I64Eq
	If
	CALLNORESUME runtime·badmorestackgsignal(SB)
	End

	// Called from f.
	// Set m->morebuf to f's caller.
	NOP SP // tell vet SP changed - stop checking offsets
	MOVD 8(SP), m_morebuf+gobuf_pc(R1)
	MOVD $16(SP), m_morebuf+gobuf_sp(R1) // f's caller's SP
	MOVD g, m_morebuf+gobuf_g(R1)

	// Set g->sched to context in f.
	MOVD 0(SP), g_sched+gobuf_pc(g)
	MOVD $8(SP), g_sched+gobuf_sp(g) // f's SP
	MOVD CTXT, g_sched+gobuf_ctxt(g)

	// Call newstack on m->g0's stack.
	MOVD R2, g
	MOVD g_sched+gobuf_sp(R2), SP
	CALL runtime·newstack(SB)
	UNDEF // crash if newstack returns

	// morestack but not preserving ctxt.
	TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0
	MOVD $0, CTXT
	JMP runtime·morestack(SB)

	TEXT ·asmcgocall(SB), NOSPLIT, $0-0
	UNDEF

	#define DISPATCH(NAME, MAXSIZE) \
	Get R0; \
	I64Const $MAXSIZE; \
	I64LeU; \
	If; \
	JMP NAME(SB); \
	End

	TEXT ·reflectcall(SB), NOSPLIT, $0-48
	I64Load fn+8(FP)
	I64Eqz
	If
	CALLNORESUME runtime·sigpanic<ABIInternal>(SB)
	End

	MOVW frameSize+32(FP), R0

	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)
	JMP runtime·badreflectcall(SB)

	#define CALLFN(NAME, MAXSIZE) \
	TEXT NAME(SB), WRAPPER, $MAXSIZE-48; \
	NO_LOCAL_POINTERS; \
	MOVW stackArgsSize+24(FP), R0; \
	\
	Get R0; \
	I64Eqz; \
	Not; \
	If; \
	Get SP; \
	I64Load stackArgs+16(FP); \
	I32WrapI64; \
	I64Load stackArgsSize+24(FP); \
	I32WrapI64; \
	MemoryCopy; \
	End; \
	\
	MOVD f+8(FP), CTXT; \
	Get CTXT; \
	I32WrapI64; \
	I64Load $0; \
	CALL; \
	\
	I64Load32U stackRetOffset+28(FP); \
	Set R0; \
	\
	MOVD stackArgsType+0(FP), RET0; \
	\
	I64Load stackArgs+16(FP); \
	Get R0; \
	I64Add; \
	Set RET1; \
	\
	Get SP; \
	I64ExtendI32U; \
	Get R0; \
	I64Add; \
	Set RET2; \
	\
	I64Load32U stackArgsSize+24(FP); \
	Get R0; \
	I64Sub; \
	Set RET3; \
	\
	CALL 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, $40-0
	NO_LOCAL_POINTERS
	MOVD RET0, 0(SP)
	MOVD RET1, 8(SP)
	MOVD RET2, 16(SP)
	MOVD RET3, 24(SP)
	MOVD $0, 32(SP)
	CALL 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·goexit(SB), NOSPLIT\|TOPFRAME, $0-0
	NOP // first PC of goexit is skipped
	CALL runtime·goexit1(SB) // does not return
	UNDEF

	TEXT runtime·cgocallback(SB), NOSPLIT, $0-24
	UNDEF

	// gcWriteBarrier performs a heap pointer write and informs the GC.
	//
	// gcWriteBarrier does NOT follow the Go ABI. It has two WebAssembly parameters:
	// R0: the destination of the write (i64)
	// R1: the value being written (i64)
	TEXT runtime·gcWriteBarrier(SB), NOSPLIT, $16
	// R3 = g.m
	MOVD g_m(g), R3
	// R4 = p
	MOVD m_p(R3), R4
	// R5 = wbBuf.next
	MOVD p_wbBuf+wbBuf_next(R4), R5

	// Record value
	MOVD R1, 0(R5)
	// Record *slot
	MOVD (R0), 8(R5)

	// Increment wbBuf.next
	Get R5
	I64Const $16
	I64Add
	Set R5
	MOVD R5, p_wbBuf+wbBuf_next(R4)

	Get R5
	I64Load (p_wbBuf+wbBuf_end)(R4)
	I64Eq
	If
	// Flush
	MOVD R0, 0(SP)
	MOVD R1, 8(SP)
	CALLNORESUME runtime·wbBufFlush(SB)
	End

	// Do the write
	MOVD R1, (R0)

	RET