Comments on: Handcrafting object files

By: Karsten

Karsten — Fri, 01 Oct 2010 06:43:04 +0000

awesome info, thanks!

By: ken

ken — Thu, 30 Sep 2010 22:21:48 +0000

Try ‘man getsectdata’ for the suite of functions. It returns the data and the size.

By: Karsten

Karsten — Thu, 30 Sep 2010 05:35:05 +0000

good point, but how do you set a veriable to the start of a section? Isn’t that involving some mach-api stuff? Same goes with the size of the segment. How do you easily get the size of that segment?

By: ken

ken — Wed, 29 Sep 2010 20:56:23 +0000

Another thing you can do is tack on a binary file as a mach segment using a linker argument.

See http://stackoverflow.com/questions/1604673/how-do-i-embed-data-into-a-mac-os-x-mach-o-binary-files-text-section/1605237#1605237

By: Marko

Marko — Wed, 29 Sep 2010 08:19:59 +0000

If your goal is simply to create an object file which contains a reserved location where you can put the data, couldn’t you simply create a c file with a global initialized char array so that you can reserve the space in the .data section without having to fiddle with as?

char data[1024*1024*100] = {1};

will create a 100Mb object file.

By: Karsten

Karsten — Wed, 29 Sep 2010 08:12:59 +0000

ha, nice find… didn’t see this directive. I think that could remove the need to search/replace the bytes manually. thanks a lot!

By: Paul

Paul — Wed, 29 Sep 2010 07:17:45 +0000

Ermmm, can you use the incbin directive in an asm file?