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[Pirata Nervo]

Is it possible or not? I have tried multiple ways and I can't seem to get it working :/

I really need to export a function from user mode as the kernel LIBC is not the same as the user LIBC and some of the functions I Need are not included in the kernel LIBC.

I have two options, create my own functions or export the function from user mode.
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[ne0h]

I know that 0x0001 attrib is for export a function from kernel to kernel or user to user, and 0x4001 for export kernel to user!
I've never tried to export a function from a user to a kernel prx module...
Have you tried with these flags?
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[Pirata Nervo]

Where do I use them?
The Only place I think of is the mode attribute
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[phobox]

in the exports file.
PSP_EXPORT_START(libName, 0, 0x4001)

the 3rd param is where to put your flags
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[Torch]

[Pirata Nervo]

oops forgot about that.
Yeah it's currently set for kernel to user.

so 0x0001 is kernel > kernel and 0x4001 is kernel -> user, then 0x4000 should be user -> user ? tried it and did not work either

EDit:
torch I am exporting from a prx i made to another prx I made :)
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[Torch]

I guess you could do it like this:

Code the original function in a kernel PRX as kernel to kernel export. Then make a wrapper function for it in the same PRX as a kernel to user export.

Then you can call the kernel version from other kernel PRXs, as well as the user wrapper from other user PRXs.

Its impossible to directly call a kernel function from a user prx, so I assume the reverse is true as well. When you have a kernel to user export, it uses syscalls. I don't know if user to kernel export is possible like the way you want..

[phobox]

[Torch]

0x0001 means direct jump to address. It works for user to user or kernel to kernel I think.

0x4001 means use syscall. AFAIK this is only for calling a kernel to user export from a user prx.

[Pirata Nervo]

I think you haven't read my first pos torch.
kernel LIBC does not have fopen, fwrite, fclose, fprintf, etc and I need them for my function as the library I am using makes of those functions.

The only way to use that function is exporting from a user prx to a kernel prx (which needs kernel mode to work).

Of course I can the user prx to execute the function when it gets loaded but that's not what I want.

@phobox I already read that file some time ago :) but of course I don't remember everything
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[Torch]

Does it compiles with USE_KERNEL_LIBC=0 ? That might provide the functions you need.

Are you writing a plugin or an EBOOT?
You only need to worry about user modules if you are writing a plugin.

If you are writing an EBOOT, the correct way IS to have the function executed from a user module. All your main working code should be user mode. You only need to load a kernel prx to do, well, kernel stuff.

If you are writing a plugin however, then you have no choice but to use various tricks to get user mode code working.

Have the user module continuously 'poll' the kernel prx for various commands. I mean export a function get_commands() from your kernel prx. The user prx should keep calling this function to see if the kernel prx needs something done.

[Pirata Nervo]

I am writing a prx of course, otherwise I would not need to export a user function from a user prx and I could do it a from a EBOOT.PBP (as it must be user mode to be executed).

graphics.prx is the user prx.
patchexit_driver.prx is the kernel prx.

patchexit_driver.prx works perfectly since NervOS 2.1 (it's a shell) but now for 2.3 I am working on some new features and I need patchexit_driver.prx to call a user mode function.
patchexit_driver.prx only works with KERNEL_LIBC and KERNEL_LIBS set to 1.
This means I cannot use the stdio.h functions. I have already created the stdio.c and stdio.h and malloc.c and malloc.h with the necessary functions but I still need time() and I couldn't find time.c anywhere so I gave up and deleted my new code.

I am trying graphics.prx in kernel mode with user LIBC but with kernel LIBS and the only error I am getting is:

[Torch]

Delete the output files every time you recompile. Usually when you change the makefile, it doesn't reflect the next time you compile it unless you clean up previous output files.

[Pirata Nervo]

that's why I use do make clean before make :P

It exports the function :now, it crashed when doing fopen I think but no problem, I will find a way to fix it.
Thank you all
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[Torch]

Can you give me you're "clean" section of the makefile?
I've tried to write one before but failed.

[Pirata Nervo]

I am not using user mode anymore. I just managed to get graphics.prx (in kernel mode) using standard I/O functions and exporting functions at the same time.

Here's my makefile:

[moonlight]

I don't know if it works in latest firmwares but I remember long ago it worked using flags 0x0001, which causes functions to resolve as jumps. But that is very propense to cause inestability and finally crash, as the user functions are being executed in kernel mode and they are programmed as user functions.

I remember I did the first version of nethostfs like that, it was a kernel prx that called user functions (net ones), and that's probably the reason why it was so unstable. Later Ahman improved it and I think he used user mode.

Anyways, I don't know if since then Sony has made more checks to make this not possible.

[Pirata Nervo]

Ok thanks moonlight. Did Ahman ever released the source for NetHostFS PC and PSP ? I know you did but I don't know about him
I managed to get the standard I/O to work anyway :)
Using a custom stdio.c and stdio.h
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[KickinAezz]

LOL!

pspiofilemgr_kernel.h.

LIBS = -lpspiofilemgr_kernel (not required since it's already in BUILD.MAK)
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Intrigued by PSP system Since December 2006.
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[Pirata Nervo]

[whistler]

[Pirata Nervo]

I thought he meant "clean" as makefile without unneeded things lol.
not the clean "section"
"make clean" is a linux command Torch. Sorry for misunderstanding

Edit:
you can also use this:

[Torch]

No I meant sometimes the makefile has a section "clean:' just like "all:" which is used to remove specific files if a general rm -f *.o isn't sufficient.

[ne0h]

A simple make clean remove all the objs file, the target and the extra targets like pbp's and related sfo...

[Pirata Nervo]

@torch I think you cannot use clean: anymore.
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