Initial commit: Go 1.23 release state

src/runtime/rt0_js_wasm.s

@@ -0,0 +1,67 @@
+// 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