forums.ps2dev.org

[hotter]

I am making a prx in kernel mode and I use it as plugin. After functions such as sin(), cos() or read directory from memory stick, web browser doesnt work, and if I push on XMB videos, then psp hangs (well the wait icon is blinking and thats all, I can still use my prx... just XMB menu hangs). What could be wrong? maybe someone had such bug?
_________________
Pragramming with:
Microsoft Visual C 2008 + pspsdk MINPSPW 0.8.10

[TyRaNiD]

Perhaps blowing away all your memory in kernel space.

[hotter]

Might be. And how I should avoid this?
_________________
Pragramming with:
Microsoft Visual C 2008 + pspsdk MINPSPW 0.8.10

[Torch]

Learn how to program. You're kernel plugin should avoid allocating any extra memory if possible. If you do don't exceed more than 100 or so KiB.

[TyRaNiD]

A touch harsh :)

Try running the command 'psp-size your.prx' and see what its total memory footprint is. Don't allocate large global buffers, don't create many threads with large stack sizes, don't do allocations direct out of kernel memory, all those kinda of things. Also ideally don't use the libc, especially not newlib, you might get away with using libm (though it is probably not recommended). You can use a cut down internal libc by specifying a makefile option to reduce memory size.

[hotter]

This is what I get after psp-size:

[Torch]

Not using kernel libc will bloat your prx by around 84KiB.
However kernel libc is limited. You will just have to make do or write your own functions for those missing ones.

Just use the equivalent sce functions for time and stuff.

[TyRaNiD]

Yah it looks like most of your bloat is in .text which means it is primarily code. 140k is quite large for a kernel executable. You really need to set the kernel libraries only and reimplement as touch says, tbh at least clock and time are implemented by the kernel just not in the libc, do a search :)

[hotter]

well everything seems to work better now, I just have problems with float and double type variables, they are = 0; but when I try to print them I get letter "f". why? :( before adding thouse two lines in make file these variables worked fine....

P.S. what are pros and cons of making a prx in kernel mode, user mode or other? maybe user mode can use more memory? well I guess the first cons would be that just in kernel mode i couldnt use syscall...
_________________
Pragramming with:
Microsoft Visual C 2008 + pspsdk MINPSPW 0.8.10

[TyRaNiD]

The kernel libc's printf doesn't support printing of floats or doubles, you have to write code to convert the float yourself to a string then print that.

As for advantages/disadvantages for plugins while you have more user ram if nothing is using it games will almost always use as much as possible so you will find some games won't run if your plugin was user mode. As for syscalls except for a small set of functions all core stuff should be accessible in kernel mode directly, main think you can't as easily access is networking.

[hotter]

I guess user mode would be better for me because my prx is usable in XMB menu, not in games. But how to disable XMB buttons from user mode? maybe there is a way to start prx in kernel mode and after patchsyscall make it user mode something like that?
_________________
Pragramming with:
Microsoft Visual C 2008 + pspsdk MINPSPW 0.8.10

[Torch]

[hotter]

what if I leave my prx as is in kernel mode and just add PSP_HEAP_SIZE_KB(1024); ? will there be more memory bugs with this?
_________________
Pragramming with:
Microsoft Visual C 2008 + pspsdk MINPSPW 0.8.10

[Torch]

[hotter]

Thx Torch, I am trying to use sceKernelAllocPartition function :)

I allocated memory for some chars..... but how to allocate memory for double array?

[Torch]

It only returns a pointer to a contiguous memory block, so i don't think you can directly call like ar[row][column] after allocation because the compiler won't know the dimensions. There's probably some macro or something to access it like a 2d array but I don't know.

[Bubbletune]