compiler error or freeze on pspSdkLoadStartModule

[jean]

While writing a VSH module dealing with other PRXs (PSP_MODULE_INFO("piKeyOpenKeyboard", 0x1000, 1, 1);), i found the error

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C:/pspsdk/psp/sdk/lib\libpspsdk.a(loadmodule.o): In function `pspSdkLoadStartMod
uleWithArgs':
: undefined reference to `snprintf'
collect2: ld returned 1 exit status
make: *** [piKeyChatPad.elf] Error 1

After a little digging, i found a post where J.F. was saying not to use USE_KERNEL_LIB* unless strictly necessary, so i tried setting

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USE_KERNEL_LIBS = 0
USE_KERNEL_LIBC = 0

in my makefile: compiled fine, freezed on pspSdkLoadStartModule 's line (found by logfile, log calls removed for sake of readability)

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int main_thread(SceSize args, void *argp) 
{
	int ch;
	
	sceKernelDelayThread(1000000);

	// get current directory
	char modName[256];
	getcwd(modName,240);
	strcat(modName,"/sioDriver.prx");
	// load siodriver
	SceUID mod = pspSdkLoadStartModule(modName, PSP_MEMORY_PARTITION_KERNEL);   // here execution stops, PSP freezes
	
    	if &#40;mod < 0&#41;
	&#123;
		sceKernelDelayThread&#40;3000000&#41;;
		sceKernelExitGame&#40;&#41;;
	&#125;
	.
	.
	.
&#125;

Issue is present in two different sourcecodes of mine, involving both kernel and user mode PRXs.

Some hints? Someone who already faced the problem? Seems like that pointed here http://forums.ps2dev.org/viewtopic.php?t=10467

[jube]

"USE_KERNEL_LIBS = 0
USE_KERNEL_LIBC = 0"

not a good idea, from trial and error with pikey as soon as you do that everything starts to go wrong !!! I am having to code my own graphics handling routine that will work with

USE_KERNEL_LIBS = 1
USE_KERNEL_LIBC = 1

for exactly that same reason, and i know nothing about graphics handling on the psp!! Simply because with

USE_KERNEL_LIBS = 1
USE_KERNEL_LIBC = 1

no pre-made graphics routines will link.

Have no idea why, and no time to learn why properly, when have time will go back to books for a reason.

[jean]

Ok, i had the suspect, too...then let me focus on the first part of the post:
how to solve the "undefined reference to `snprintf'"? I already checked and library containing that function IS linked properly..

[jean]

back to

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USE_KERNEL_LIBS = 1
USE_KERNEL_LIBC = 1

i replaced

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SceUID mod = pspSdkLoadStartModule("ms0:/.../mymodule.prx", PSP_MEMORY_PARTITION_USER);

with

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SceKernelLMOption option;
SceUID mpid = PSP_MEMORY_PARTITION_USER;
memset(&option, 0, sizeof(option));
option.size = sizeof(option);
option.mpidtext = mpid;
option.mpiddata = mpid;
option.position = 0;
option.access = 1;

SceUID mod = sceKernelLoadModule("ms0:/.../mymodule.prx", 0, &option); 
mod = sceKernelStartModule(mod, 0, NULL, 0, &option); 

as adviced here (http://forums.ps2dev.org/viewtopic.php? ... c85cacbc6e)... now i get a blurry

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SCE_KERNEL_ERROR_ERROR = 0x80020001

from sceKernelStartModule: WHY??.
What does really sceKernelStartModule do? Does it simply call "module_start" of supplied module or it is needed to run even if i only want my functions loaded (to hook api ones) and nothing more??
Very confused...

[Torch]

Try this:

For kernel plugins leave the
USE_KERNEL_LIBS = 1
USE_KERNEL_LIBC = 1

Install the M33SDK and include kubridge.h
Then use kuKernelLoadModule for loading.
Start it with the sceKKernelStartModule.

Don't load into user memory but load into kernel memory. Just give NULL for *options it will load into kernel memory automatically.

[jean]

Oh, very thanks, torch...i will surely try your solution. Only thing to hilight is i sometime need user mode to patch user mode functions...oh, and setting null into options appear resulting in "illegal" error from the load module function...anyway i will invesigate in the direction you pointed....thanks again!

jean

[Torch]

Oh, very thanks, torch...i will surely try your solution. Only thing to hilight is i sometime need user mode to patch user mode functions...oh, and setting null into options appear resulting in "illegal" error from the load module function...anyway i will invesigate in the direction you pointed....thanks again!

jean

If you want to load into user memory then you shouldn't pass NULL. You'll have to create an Option structure specifying user memory.

mod = kuKernelLoadModule("flash0:/module.prx", 0, NULL);