How to add standard symbolic constants with bitwise operators (like ORs)

Question

I am working with IDA and I have the OpenProcess function receiving dwDesireAccess of 0x410:

According to MSDN we can see that 0x410 is the result of OR between two access rights:

PROCESS_QUERY_INFORMATION (0x0400)
PROCESS_VM_READ (0x0010)

How can I set a standard symbolic constant such as
PROCESS_QUERY_INFORMATION | PROCESS_VM_READ ?

I must do it manually (with "Manual...")?

This is only what I have:

Answer 1

You could create a bitfield enum. Since the enum containing PROCESS_VM_READ already exists in the MSSDK type library, we are going to copy that and modify it to become a bitfield.

1. Go to the enums subview, then right click and Add enum... (press Insert on Windows).

2. Click Add standard enum by symbol name.
   

3. Find PROCESS_VM_READ, then click OK.
   

4. A new enum called MACRO_PROCESS should be added. Expand it (CtrlNumpad + or right click → Unhide)

5. Delete the enum member PROCESS_ALL_ACCESS (press U when selecting it).
   

6. Right click and choose Edit enum... (CtrlE).

7. Check Bitfield, then click OK. (This step will fail if you don't perform step 5)

Now the MACRO_PROCESS bitfield should appear when you hit M on 410h, and should appear as something like

mov     eax, PROCESS_VM_READ or PROCESS_QUERY_INFORMATION