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flat assembler > OS Construction > Linking C Code with FASM?

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me239



Joined: 06 Jan 2011
Posts: 200
Hey everyone, I'm just getting back into OS Dev after about a 7 year hiatus... so I thought going into 32 bit PMode would be my new goal! I've written a basic DOS clone before for real mode, but real mode is just so much simpler than 32 bit. I've managed to get my OS to print strings in protected mode, but I've seem to have hit a wall getting beyond that. I'm still clueless as to how to effectively manage virtual memory or get a working IDT. I've been looking at tutorials, but each one seems to use ELF executables written in C and booted by GRUB. Call me old fashioned, but I still prefer booting from a floppy or at least an image of one.

Either way, I see this a good chance to finally learn some C, but I also want to use FASM instead of GAS or GCC. Does anyone know how to seamlessly link FASM code with C like GCC can do? Also, anyone know of any good 'baby step' tutorials I can look at that use FASM (or at least pure assembly) that break down concepts like paging and virtual memory?

Sorry if some questions don't make sense, I'm very new to PMode and programming outside of 16 Bit FASM, BASIC, and dabbling in C.
Post 21 Aug 2019, 00:47
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redsock



Joined: 09 Oct 2009
Posts: 312
Location: Australia
me239 wrote:
Either way, I see this a good chance to finally learn some C, but I also want to use FASM instead of GAS or GCC. Does anyone know how to seamlessly link FASM code with C like GCC can do? Also, anyone know of any good 'baby step' tutorials I can look at that use FASM (or at least pure assembly) that break down concepts like paging and virtual memory?
While I didn't write any of my gcc integration for 32 bit, many of the same principles apply: https://2ton.com.au/rants_and_musings/gcc_integration.html ... Linking with my library is similar/same-as linking with "normal fasm object files" so really, the primary differences with 32 vs 64 will be calling convention, not linking semantics.

HTH Smile

Cheers

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2 Ton Digital - https://2ton.com.au/
Post 21 Aug 2019, 09:09
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