getting C function adresses in ASM

[stonedzealot]

I'm trying to get the offset of a C function so I can fill out the IDTR all right, but I can't seem to get there. The Xsism code (using C) just used (dword)nameofhandler to get the offset so I thought something along the lines of:

Code: Select all

[extern _testint] ; function defined in C
   offset dd 0
...
   mov dword offset, _testint

And, of course (or I wouldn't be writing this) it didn't work. NASM doesn't like the mov statement (invalid combo of opcode and operand) but I'm not quite sure how to cast _testint as a dword or if I'm even on the right track. Can someone give me a nudge in the right direction?

[Tim]

This looks like MASM syntax. In NASM, you want:

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mov dword [offset], _testint

[stonedzealot]

Agh, okay, thanks. It works now!