forked from mirrors/gotosocial
35 lines
1.2 KiB
Go
35 lines
1.2 KiB
Go
// Copyright 2009 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-GO file.
|
|
|
|
//go:build linux && (386 || arm || mips || mipsle)
|
|
// +build linux
|
|
// +build 386 arm mips mipsle
|
|
|
|
package memory
|
|
|
|
import (
|
|
"syscall"
|
|
)
|
|
|
|
// Function syscall.mmap and syscall.mmap2 are same for linux/386, linux/arm,
|
|
// linux/mips and linux/mipsle
|
|
|
|
// https://cs.opensource.google/go/go/+/refs/tags/go1.17.8:src/syscall/syscall_linux_386.go;l=99-105
|
|
func mmapSyscall(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
|
|
page := uintptr(offset / 4096)
|
|
if offset != int64(page)*4096 {
|
|
return 0, syscall.EINVAL
|
|
}
|
|
return mmap2Syscall(addr, length, prot, flags, fd, page)
|
|
}
|
|
|
|
// https://cs.opensource.google/go/go/+/refs/tags/go1.17.8:src/syscall/zsyscall_linux_386.go;l=1361-1370
|
|
func mmap2Syscall(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) {
|
|
r0, _, e1 := syscall.Syscall6(syscall.SYS_MMAP2, uintptr(addr), uintptr(length), uintptr(prot), uintptr(flags), uintptr(fd), uintptr(pageOffset))
|
|
xaddr = uintptr(r0)
|
|
if e1 != 0 {
|
|
err = e1
|
|
}
|
|
return
|
|
}
|