Hi there,

since I am new to the project i am using the preinstalled environment provided in the virtual box image. Since yesterday I am trying to find a simple way for profiling parts of c-code. I am a bit overwhelmed by the vast amount of documentation.
Yet I haven't found a way how to enable profiling for a certain c-funktion oder code segment.
Does the OR1200 provide a clock counter that can be read out by software ?
Do I have to rebuild the ork1sim with another config ? What config should I use?

Best regards,
Marten

At the low level, there is the tick timer register: SPR_TTMR (mode) and SPR_TTCR (count). You will want to reference the OR1000 architecture reference manual section on the "Tick Timer Facility". You could also look at how the architecture support code for newlib or Linux gets timing information.

Thanks so far! I had a look into the document and found out that I am able to read out the tick register with "l.mfspr". But I am not sure how to adress the registers and how to write code for accessing via a c program. Is there a macro available which allows embedding asm code into c code ?

Kind regards

Easiest is to use inline asm to read/write mfspr/mtspr
Example:
http://git.openrisc.net/cgit.cgi/stefan/u-boot/tree/arch/openrisc/include/asm/system.h

If you are using newlib/libgloss, there are some helper-functions you can use
Example:
http://git.chokladfabriken.org/?p=membenchmark.git;a=blob;f=main.c;h=64b1ce8c613ca415e5b4d56a04d295a9d2e59fad;hb=HEAD

Maybe the tick timer does not work within the or1k-sim ? Here is the code i used for profiling a C-CodeBlock:

int timerState = 0;
int numCycles= 0;
//Enabling the Timer:
or1k_mtspr(SPR_TTMR, SPR_TTMR_CR);

//saving the timerstate:
timerState = or1k_mfspr(SPR_TTCR);

//Do some printf() and computation;

numCycles = timerState - or1k_mfspr(SPR_TTCR);


timerState always remains 0, what is wrong there? Does or1ksim not simulate the ticktimer?