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Diffstat (limited to '')
| -rw-r--r-- | src/runtime/rt0_js_wasm.s | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/runtime/rt0_js_wasm.s b/src/runtime/rt0_js_wasm.s new file mode 100644 index 0000000..34a6047 --- /dev/null +++ b/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 |