[syslinux] Comboot Menu

[ganapathy murali krishnan]

What I have found so far....

1. Create a .C file and rename "int main(void)" with "int start(void)"
2. Compile into obj (and dont link) using
     wcl -3 -mt -osx -c -cc main.c
3. Compile the asm snippet below using
     wasm -3 -mt snippet.asm
4. Finally link all of them together using
     wlink FORMAT DOS COM FILE snippet FILE main OP nodefaultlibs

All works except I see an undefined reference for _small_code_. I still 
need to see what I am doing wrong.

- Murali

ganapathy murali krishnan wrote:
> I seem to see some sunlight :-)
> 
> I also wrote to Kendall (a developer of OpenWatcom) with this question. 
> This was his reply... Before I try this I just want to pass it by this 
> list. May be there needs to be more changes to the .asm file which 
> Kendall proposed.
> 
> If this works out, this should be added with SYSLINUX documentation, so 
> others dont hit this road block.
> 
> ------ BEGIN EMAIL -------
> 
> Basically you need to link the very first object module in your program
> list as a special assembler stub that has the 'START' entry point defined
> (by default this is the runtime library). You also need to tell the
> linker NOT to use any default runtime libraries, so you will not be able
> to link until you provide this file. The linker option you want is:
> 
> OP nodefaultlibs
> 
> Below is some WASM assembler code that will set the startup entry point
> and do nothing but return, which you need to link as the very first
> object file in your object file list (actually I think Watcom may accept
> this anywhere in the list - Borland used to require it first in the
> list). The key is the very last line that tells the object record where
> the program entry point should be:
> 
>         name    cstart
>         assume  nothing
> 
> _TEXT   segment use16 para public 'CODE'
> 
>         assume  cs:_TEXT
> 
> _start proc near
> 
>         ret
> 
> _start endp
> 
> _TEXT   ends
> 
>         end     _start
> 
> ----- END EMAIL -----
> 
> 
> - Murali
> 
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