OpenEuphoria

Calling a euphoria func from asm

• Posted by Alexander Toresson <toressonodakra at swipnet.se> Jul 06, 2004
• 497 views

I've been trying to call a function written in euphoria from some asm 
code, though I've had little success. I'm first trying to call a func 
with no arguments, and I'll expand it later. Here's the code:

include machine.e
include dll.e
include asm.e
atom caller, hiproc

function HelloWorld(integer a)
    puts(1, "Hello World!\n")
    return 0
end function

hiproc = call_back(routine_id("HelloWorld"))
caller = get_asm("pushad\n" &
                 "call near #" & sprintf("%x", hiproc) & "\n" &
                 "popad\n" &
                 "ret")

call(caller)

if wait_key() then end if

As far as I know, nothing should be pushed when calling a function which
doesn't have any arguments. I've looked up the calling convention and
I've not found any info about something that should be pushed in this 
case. An interesting thing is that if you change "call(caller)" to
"call(hiproc)" you'll get the "Hello World" printed, though the program
crashes after that. Maybe because of that call() doesn't save any 
registers?

Regards, Alexander Toresson

Shhh! Be vewy quiet! I'm hunting wuntime ewwows!