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45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
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// Copyright 2025 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package windows provides the syscall primitives required for the runtime.
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package windows
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import (
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"internal/abi"
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)
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// MaxArgs should be divisible by 2, as Windows stack
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// must be kept 16-byte aligned on syscall entry.
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//
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// Although it only permits maximum 42 parameters, it
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// is arguably large enough.
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const MaxArgs = 42
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// StdCallInfo is a structure used to pass parameters to the system call.
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type StdCallInfo struct {
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Fn uintptr
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N uintptr // number of parameters
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Args uintptr // parameters
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R1 uintptr // return values
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R2 uintptr
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Err uintptr // error number
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}
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// StdCall calls a function using Windows' stdcall convention.
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//
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//go:noescape
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func StdCall(fn *StdCallInfo)
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// asmstdcall is the function pointer for [AsmStdCallAddr].
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func asmstdcall(fn *StdCallInfo)
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// AsmStdCallAddr is the address of a function that accepts a pointer
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// to [StdCallInfo] stored on the stack following the C calling convention,
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// and calls the function using Windows' stdcall calling convention.
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// Shouldn't be called directly from Go.
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func AsmStdCallAddr() uintptr {
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return abi.FuncPCABI0(asmstdcall)
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}
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