mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-05-20 09:18:13 +00:00
75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
//go:build darwin || linux
|
|
// +build darwin linux
|
|
|
|
/*
|
|
* Copyright 2021 ByteDance Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package loader
|
|
|
|
import (
|
|
`fmt`
|
|
`os`
|
|
`reflect`
|
|
`syscall`
|
|
`unsafe`
|
|
)
|
|
|
|
const (
|
|
_AP = syscall.MAP_ANON | syscall.MAP_PRIVATE
|
|
_RX = syscall.PROT_READ | syscall.PROT_EXEC
|
|
_RW = syscall.PROT_READ | syscall.PROT_WRITE
|
|
)
|
|
|
|
type Loader []byte
|
|
type Function unsafe.Pointer
|
|
|
|
func (self Loader) Load(fn string, fp int, args int, argPtrs []bool, localPtrs []bool) (f Function) {
|
|
p := os.Getpagesize()
|
|
n := (((len(self) - 1) / p) + 1) * p
|
|
|
|
/* register the function */
|
|
m := mmap(n)
|
|
v := fmt.Sprintf("runtime.__%s_%x", fn, m)
|
|
|
|
registerFunction(v, m, uintptr(n), fp, args, uintptr(len(self)), argPtrs, localPtrs)
|
|
|
|
/* reference as a slice */
|
|
s := *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader {
|
|
Data : m,
|
|
Cap : n,
|
|
Len : len(self),
|
|
}))
|
|
|
|
/* copy the machine code, and make it executable */
|
|
copy(s, self)
|
|
mprotect(m, n)
|
|
return Function(&m)
|
|
}
|
|
|
|
func mmap(nb int) uintptr {
|
|
if m, _, e := syscall.RawSyscall6(syscall.SYS_MMAP, 0, uintptr(nb), _RW, _AP, 0, 0); e != 0 {
|
|
panic(e)
|
|
} else {
|
|
return m
|
|
}
|
|
}
|
|
|
|
func mprotect(p uintptr, nb int) {
|
|
if _, _, err := syscall.RawSyscall(syscall.SYS_MPROTECT, p, uintptr(nb), _RX); err != 0 {
|
|
panic(err)
|
|
}
|
|
}
|