50 lines
890 B
Go
50 lines
890 B
Go
//go:build unix && !disable_jit
|
|
|
|
package randomx
|
|
|
|
import (
|
|
"golang.org/x/sys/unix"
|
|
"unsafe"
|
|
)
|
|
|
|
func (f ProgramFunc) Execute(rl *RegisterLine) {
|
|
if f == nil {
|
|
panic("program is nil")
|
|
}
|
|
memoryPtr := &f
|
|
fun := *(*func(rl *RegisterLine))(unsafe.Pointer(&memoryPtr))
|
|
|
|
fun(rl)
|
|
}
|
|
|
|
func (f ProgramFunc) Close() error {
|
|
return unix.Munmap(f)
|
|
}
|
|
|
|
func mapProgram(program []byte) ProgramFunc {
|
|
// Write only
|
|
execFunc, err := unix.Mmap(-1, 0, len(program), unix.PROT_WRITE, unix.MAP_PRIVATE|unix.MAP_ANONYMOUS)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Introduce machine code into the memory region
|
|
copy(execFunc, program)
|
|
|
|
// uphold W^X
|
|
|
|
// Read and Exec only
|
|
err = unix.Mprotect(execFunc, unix.PROT_READ|unix.PROT_EXEC)
|
|
if err != nil {
|
|
defer func() {
|
|
// unmap if we err
|
|
err := unix.Munmap(execFunc)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}()
|
|
panic(err)
|
|
}
|
|
|
|
return execFunc
|
|
}
|