panic: permission denied

[dgofman]

I have implemented monkey_arm64.go jmpToFunctionValue. Now trying to compile and execute my code on a Mac M1.
I am getting an exception when making a call to syscall.Mprotect (syscall.PROT_WRITE). Do you know how to fix this problem?

func mprotectCrossPage(addr uintptr, length int, prot int) {
	pageSize := syscall.Getpagesize()
	for p := pageStart(addr); p < addr+uintptr(length); p += uintptr(pageSize) {
		page := rawMemoryAccess(p, pageSize)

	        err := syscall.Mprotect(page, prot) //syscall.PROT_READ|syscall.PROT_WRITE|syscall.PROT_EXEC

		if err != nil {
			panic(err)
		}
	}
}

func jmpToFunctionValue(to uintptr) []byte {
	/*return []byte{
		0x48, 0xBA,
		byte(to),
		byte(to >> 8),
		byte(to >> 16),
		byte(to >> 24),
		byte(to >> 32),
		byte(to >> 40),
		byte(to >> 48),
		byte(to >> 56), // movabs rdx,to
		0xFF, 0x22,     // jmp QWORD PTR [rdx]
	}*/
	raw := []uint32{
		uint32((((to) & 0xffff) << 5) | 0xD2800000),       // MOVZ X0, <bytes 0,1>
		uint32((((to >> 16) & 0xffff) << 5) | 0xF2A00000), // MOVK X0, <bytes 2,4>, LSL 16
		uint32((((to >> 32) & 0xffff) << 5) | 0xF2C00000), // MOVK X0, <bytes 4,5>, LSL 32
		uint32((((to >> 48) & 0xffff) << 5) | 0xF2E00000), // MOVK X0, <bytes 6,7>, LSL 48
		0xD63F0000, // BLR X0
	}

	// Get the slice header
	header := *(*reflect.SliceHeader)(unsafe.Pointer(&raw))

	header.Len *= 4 // 4 bytes in uint32
	header.Cap *= 4 // 4 bytes in uint32

	// Convert slice header to an []byte
	data := *(*[]byte)(unsafe.Pointer(&header))
	return data
}

[dgofman]

It looks like this is a bug

https://developer.apple.com/forums/thread/672804

https://gitlab.com/qemu-project/qemu/-/commit/c118881ee607dcac

zherczeg/sljit#99

[agiledragon]

Please refer to this issue that has been closed, #10.

[agiledragon]

Arm64 is fully supported in the v2.2.0.