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// 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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