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Editing: rt0_js_wasm.s

// 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 "textflag.h"

// _rt0_wasm_js is not used itself. It only exists to mark the exported functions as alive.
TEXT _rt0_wasm_js(SB),NOSPLIT,$0
	I32Const $wasm_export_run(SB)
	Drop
	I32Const $wasm_export_resume(SB)
	Drop
	I32Const $wasm_export_getsp(SB)
	Drop

// wasm_export_run gets called from JavaScript. It initializes the Go runtime and executes Go code until it needs
// to wait for an event. It does NOT follow the Go ABI. It has two WebAssembly parameters:
// R0: argc (i32)
// R1: argv (i32)
TEXT wasm_export_run(SB),NOSPLIT,$0
	MOVD $runtime·wasmStack+(m0Stack__size-16)(SB), SP

Get SP
	Get R0 // argc
	I64ExtendI32U
	I64Store $0

Get SP
	Get R1 // argv
	I64ExtendI32U
	I64Store $8

I32Const $0 // entry PC_B
	Call runtime·rt0_go(SB)
	Drop
	Call wasm_pc_f_loop(SB)

Return

// wasm_export_resume gets called from JavaScript. It resumes the execution of Go code until it needs to wait for
// an event.
TEXT wasm_export_resume(SB),NOSPLIT,$0
	I32Const $0
	Call runtime·handleEvent(SB)
	Drop
	Call wasm_pc_f_loop(SB)

Return

// wasm_export_getsp gets called from JavaScript to retrieve the SP.
TEXT wasm_export_getsp(SB),NOSPLIT,$0
	Get SP
	Return

TEXT runtime·pause(SB), NOSPLIT, $0-8
	MOVD newsp+0(FP), SP
	I32Const $1
	Set PAUSE
	RETUNWIND

TEXT runtime·exit(SB), NOSPLIT, $0-4
	I32Const $0
	Call runtime·wasmExit(SB)
	I32Const $1
	Set PAUSE
	RETUNWIND

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