Assembly Function

[chris]

I am having trouble with my assembly function for changing ISR's. It is called "change_isr", and when I link my kernel it says:

undefined reference to 'change_isr'

I've got the prototype in a header file and it is included. I've also tryed putting it directly in the C file, but it shows no difference.

[Therx]

C Functions need a leading underscore so in the assembly source rename the function to _change_isr. Like wise if you try to call a C function from asm then prefix an underscore to the function name eg

ASM

Code: Select all

global _sharethis
extern _getthis

_sharethis: jmp _getthis

C

Code: Select all

extern void sharethis();
void gethis();

...
sharethis();
...

void getthis()
{
 ...
}

pete

[chris]

Thanks I got it working now

[Candy]

This (afaik) doesn't work under linux, as GCC does not prepend the _'s.

[chris]

Yeah, it wasn't the _'s, I messed up the [global <func>].