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// Copyright 2014 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.
package runtime
import (
"unsafe"
)
const _SIGPROF = 0 // dummy value for badsignal
type callbacks struct {
lock mutex
ctxt [cb_max]*wincallbackcontext
n int
}
func (c *wincallbackcontext) isCleanstack() bool {
return c.cleanstack
}
func (c *wincallbackcontext) setCleanstack(cleanstack bool) {
c.cleanstack = cleanstack
}
var (
cbs callbacks
cbctxts **wincallbackcontext = &cbs.ctxt[0] // to simplify access to cbs.ctxt in sys_windows_*.s
callbackasm byte // type isn't really byte, it's code in runtime
)
// callbackasmAddr returns address of runtime.callbackasm
// function adjusted by i.
// runtime.callbackasm is just a series of CALL instructions
// (each is 5 bytes long), and we want callback to arrive at
// correspondent call instruction instead of start of
// runtime.callbackasm.
func callbackasmAddr(i int) uintptr {
return uintptr(add(unsafe.Pointer(&callbackasm), uintptr(i*5)))
}
func compileCallback(fn eface, cleanstack bool) (code uintptr) {
if fn._type == nil || (fn._type.kind&kindMask) != kindFunc {
panic("compilecallback: not a function")
}
ft := (*functype)(unsafe.Pointer(fn._type))
if len(ft.out) != 1 {
panic("compilecallback: function must have one output parameter")
}
uintptrSize := unsafe.Sizeof(uintptr(0))
if t := (**_type)(unsafe.Pointer(&ft.out[0])); (*t).size != uintptrSize {
panic("compilecallback: output parameter size is wrong")
}
argsize := uintptr(0)
for _, t := range (*[1024](*_type))(unsafe.Pointer(&ft.in[0]))[:len(ft.in)] {
if (*t).size > uintptrSize {
panic("compilecallback: input parameter size is wrong")
}
argsize += uintptrSize
}
lock(&cbs.lock)
defer unlock(&cbs.lock)
n := cbs.n
for i := 0; i < n; i++ {
if cbs.ctxt[i].gobody == fn.data && cbs.ctxt[i].isCleanstack() == cleanstack {
return callbackasmAddr(i)
}
}
if n >= cb_max {
gothrow("too many callback functions")
}
c := new(wincallbackcontext)
c.gobody = fn.data
c.argsize = argsize
c.setCleanstack(cleanstack)
if cleanstack && argsize != 0 {
c.restorestack = argsize
} else {
c.restorestack = 0
}
cbs.ctxt[n] = c
cbs.n++
return callbackasmAddr(n)
}
func getLoadLibrary() uintptr
//go:nosplit
func syscall_loadlibrary(filename *uint16) (handle, err uintptr) {
var c libcall
c.fn = getLoadLibrary()
c.n = 1
c.args = uintptr(unsafe.Pointer(&filename))
cgocall_errno(unsafe.Pointer(funcPC(asmstdcall)), unsafe.Pointer(&c))
handle = c.r1
if handle == 0 {
err = c.err
}
return
}
func getGetProcAddress() uintptr
//go:nosplit
func syscall_getprocaddress(handle uintptr, procname *byte) (outhandle, err uintptr) {
var c libcall
c.fn = getGetProcAddress()
c.n = 2
c.args = uintptr(unsafe.Pointer(&handle))
cgocall_errno(unsafe.Pointer(funcPC(asmstdcall)), unsafe.Pointer(&c))
outhandle = c.r1
if outhandle == 0 {
err = c.err
}
return
}
//go:nosplit
func syscall_Syscall(fn, nargs, a1, a2, a3 uintptr) (r1, r2, err uintptr) {
var c libcall
c.fn = fn
c.n = nargs
c.args = uintptr(unsafe.Pointer(&a1))
cgocall_errno(unsafe.Pointer(funcPC(asmstdcall)), unsafe.Pointer(&c))
return c.r1, c.r2, c.err
}
//go:nosplit
func syscall_Syscall6(fn, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) {
var c libcall
c.fn = fn
c.n = nargs
c.args = uintptr(unsafe.Pointer(&a1))
cgocall_errno(unsafe.Pointer(funcPC(asmstdcall)), unsafe.Pointer(&c))
return c.r1, c.r2, c.err
}
//go:nosplit
func syscall_Syscall9(fn, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr) {
var c libcall
c.fn = fn
c.n = nargs
c.args = uintptr(unsafe.Pointer(&a1))
cgocall_errno(unsafe.Pointer(funcPC(asmstdcall)), unsafe.Pointer(&c))
return c.r1, c.r2, c.err
}
//go:nosplit
func syscall_Syscall12(fn, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12 uintptr) (r1, r2, err uintptr) {
var c libcall
c.fn = fn
c.n = nargs
c.args = uintptr(unsafe.Pointer(&a1))
cgocall_errno(unsafe.Pointer(funcPC(asmstdcall)), unsafe.Pointer(&c))
return c.r1, c.r2, c.err
}
//go:nosplit
func syscall_Syscall15(fn, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15 uintptr) (r1, r2, err uintptr) {
var c libcall
c.fn = fn
c.n = nargs
c.args = uintptr(unsafe.Pointer(&a1))
cgocall_errno(unsafe.Pointer(funcPC(asmstdcall)), unsafe.Pointer(&c))
return c.r1, c.r2, c.err
}
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