blob: 722a73d108e7f3d647c77cad7d5b5a5983d8f9d0 [file] [log] [blame]
// 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"
)
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
)
func callbackasm()
// callbackasmAddr returns address of runtime.callbackasm
// function adjusted by i.
// On x86 and amd64, runtime.callbackasm is a series of CALL instructions,
// and we want callback to arrive at
// correspondent call instruction instead of start of
// runtime.callbackasm.
// On ARM, runtime.callbackasm is a series of mov and branch instructions.
// R12 is loaded with the callback index. Each entry is two instructions,
// hence 8 bytes.
func callbackasmAddr(i int) uintptr {
var entrySize int
switch GOARCH {
default:
panic("unsupported architecture")
case "386", "amd64":
entrySize = 5
case "arm":
// On ARM, each entry is a MOV instruction
// followed by a branch instruction
entrySize = 8
}
return funcPC(callbackasm) + uintptr(i*entrySize)
}
//go:linkname compileCallback syscall.compileCallback
func compileCallback(fn eface, cleanstack bool) (code uintptr) {
if fn._type == nil || (fn._type.kind&kindMask) != kindFunc {
panic("compileCallback: expected function with one uintptr-sized result")
}
ft := (*functype)(unsafe.Pointer(fn._type))
if len(ft.out()) != 1 {
panic("compileCallback: expected function with one uintptr-sized result")
}
uintptrSize := unsafe.Sizeof(uintptr(0))
if ft.out()[0].size != uintptrSize {
panic("compileCallback: expected function with one uintptr-sized result")
}
argsize := uintptr(0)
for _, t := range ft.in() {
if t.size > uintptrSize {
panic("compileCallback: argument size is larger than uintptr")
}
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 {
throw("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)
}
const _LOAD_LIBRARY_SEARCH_SYSTEM32 = 0x00000800
// When available, this function will use LoadLibraryEx with the filename
// parameter and the important SEARCH_SYSTEM32 argument. But on systems that
// do not have that option, absoluteFilepath should contain a fallback
// to the full path inside of system32 for use with vanilla LoadLibrary.
//go:linkname syscall_loadsystemlibrary syscall.loadsystemlibrary
//go:nosplit
func syscall_loadsystemlibrary(filename *uint16, absoluteFilepath *uint16) (handle, err uintptr) {
lockOSThread()
c := &getg().m.syscall
if useLoadLibraryEx {
c.fn = getLoadLibraryEx()
c.n = 3
args := struct {
lpFileName *uint16
hFile uintptr // always 0
flags uint32
}{filename, 0, _LOAD_LIBRARY_SEARCH_SYSTEM32}
c.args = uintptr(noescape(unsafe.Pointer(&args)))
} else {
c.fn = getLoadLibrary()
c.n = 1
c.args = uintptr(noescape(unsafe.Pointer(&absoluteFilepath)))
}
cgocall(asmstdcallAddr, unsafe.Pointer(c))
handle = c.r1
if handle == 0 {
err = c.err
}
unlockOSThread() // not defer'd after the lockOSThread above to save stack frame size.
return
}
//go:linkname syscall_loadlibrary syscall.loadlibrary
//go:nosplit
func syscall_loadlibrary(filename *uint16) (handle, err uintptr) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = getLoadLibrary()
c.n = 1
c.args = uintptr(noescape(unsafe.Pointer(&filename)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
handle = c.r1
if handle == 0 {
err = c.err
}
return
}
//go:linkname syscall_getprocaddress syscall.getprocaddress
//go:nosplit
func syscall_getprocaddress(handle uintptr, procname *byte) (outhandle, err uintptr) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = getGetProcAddress()
c.n = 2
c.args = uintptr(noescape(unsafe.Pointer(&handle)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
outhandle = c.r1
if outhandle == 0 {
err = c.err
}
return
}
//go:linkname syscall_Syscall syscall.Syscall
//go:nosplit
func syscall_Syscall(fn, nargs, a1, a2, a3 uintptr) (r1, r2, err uintptr) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = fn
c.n = nargs
c.args = uintptr(noescape(unsafe.Pointer(&a1)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
return c.r1, c.r2, c.err
}
//go:linkname syscall_Syscall6 syscall.Syscall6
//go:nosplit
func syscall_Syscall6(fn, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = fn
c.n = nargs
c.args = uintptr(noescape(unsafe.Pointer(&a1)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
return c.r1, c.r2, c.err
}
//go:linkname syscall_Syscall9 syscall.Syscall9
//go:nosplit
func syscall_Syscall9(fn, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = fn
c.n = nargs
c.args = uintptr(noescape(unsafe.Pointer(&a1)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
return c.r1, c.r2, c.err
}
//go:linkname syscall_Syscall12 syscall.Syscall12
//go:nosplit
func syscall_Syscall12(fn, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12 uintptr) (r1, r2, err uintptr) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = fn
c.n = nargs
c.args = uintptr(noescape(unsafe.Pointer(&a1)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
return c.r1, c.r2, c.err
}
//go:linkname syscall_Syscall15 syscall.Syscall15
//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) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = fn
c.n = nargs
c.args = uintptr(noescape(unsafe.Pointer(&a1)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
return c.r1, c.r2, c.err
}
//go:linkname syscall_Syscall18 syscall.Syscall18
//go:nosplit
func syscall_Syscall18(fn, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18 uintptr) (r1, r2, err uintptr) {
lockOSThread()
defer unlockOSThread()
c := &getg().m.syscall
c.fn = fn
c.n = nargs
c.args = uintptr(noescape(unsafe.Pointer(&a1)))
cgocall(asmstdcallAddr, unsafe.Pointer(c))
return c.r1, c.r2, c.err
}