Launching an homebrew within another homebrew

Phantom8 · Post by **Phantom8** » Fri Feb 10, 2006 3:46 pm

I'm working on a screen shot tool which allows you to take screen shots from other UMD games/homebrew. I know there are a couple available, but I want to make my own.

I have not much problem in getting screenshots for UMD games, but I can't seem to get any homebrew to load properly within my screen shot program. I used sceKernelLoadModule, but it always returns with memory block allocation failure when loading homebrew. I checked I still have 24MB of total free memory left before launching another homebrew. Anyone has any ideas? TIA!

groepaz · Post by **groepaz** » Fri Feb 10, 2006 4:18 pm

you'll have to create a program that loads into kernel space - look how psplink does that by using a small bootstrap loader and a prx which contains the actual program.

Phantom8 · Post by **Phantom8** » Sat Feb 11, 2006 12:41 pm

groepaz, thanks for the suggestion! Is creating a prx in kernel space the only way to solve the problem? Will it still work if the prx run under user space?

Post by **TyRaNiD** » Sat Feb 11, 2006 12:45 pm

A possible alternative is to link your elf at a really low address (think 0x88004000 is the lowest you can go and still run), look at psp-packer's stub source for ideas how to relink an elf to a different address. However the kernel mode prx is the best solution as it moves your code completely out of user memory, although if you are making screenshots using png you will be tight for space as that lib is _big_ :)

Phantom8 · Post by **Phantom8** » Mon Feb 13, 2006 5:28 pm

Thanks for the hint, TyRaNiD! I think I'll stick with the kernel prx approach if I can get it to work. lol.