How to install exception handler for DSP

HardikShah

Mastermind 20245 points

Other Parts Discussed in Thread: SYSBIOS

Hi,

I have installed exception handler for M4 using following way.

Void Utils_exceptionHookFxn(ti_sysbios_family_arm_m3_Hwi_ExcContext *excCtx)

where about function is registered in .cfg file as below

/* Exception hook function */
var HwiM3 = xdc.useModule('ti.sysbios.family.arm.m3.Hwi');

/* enable print of exception handing info */
HwiM3.enableException = true;
HwiM3.excHookFunc = '&Utils_exceptionHookFxn';

Again how to install XDC run time handler for DSP. I have done same for M3 as below

Void Utils_errorRaiseHook(Error_Block *eb)

Above function is registered in .cfg file as

/* XDC runtime function */
var Error = xdc.useModule("xdc.runtime.Error");
Error.raiseHook = "&Utils_errorRaiseHook";

Regards,

Hardik Shah

over 12 years ago

0 ToddMullanix over 12 years ago

TI__Guru* 96960 points

What version of SYS/BIOS are you using? What device are you on?

Todd

0 HardikShah over 12 years ago in reply to ToddMullanix

TI__Mastermind 20245 points

Hi,

BIOS Version I am using is 6.35.01.29. I am using Vayu device which has C66 DSP. I have same question for eve as well. Do you have something similar for eve as well.

Regards,

Hardik Shah

0 ToddMullanix over 12 years ago in reply to HardikShah

TI__Guru* 96960 points

A difference for the 64p Exception handler is that there are several types of Exception hooks:

* (1) exceptionHook - called whenever an exception occurs.
* (2) internalHook - called only when an internal exception occurs.
* (3) externalHook - called only when an external exception occurs.
* (4) nmiHook - called only when a legacy NMI occurs.
* (5) returnHook - called whenever an exception occurs.

Here's an example of plugging the exceptionHook and internalHook:

var Exception = xdc.useModule('ti.sysbios.family.c64p.Exception');

Exception.exceptionHook = '&myExceptionHook';
Exception.internalHook = '&myInternalHook';

0 HardikShah over 12 years ago in reply to ToddMullanix

TI__Mastermind 20245 points

Hi,

I assume that exception hook will handle everything and is a super set.. Only problem i have with hook function is that it doesnt have any arguments. So if i want to dump registers into my handler how will I do that. Registers are available for M3 and M4 exception handler but not for DSP. This is a requirement since if DSP crashes we can get the debug prints and registers onto M3 since M3 is a host. We dump registers onto shared buffer which is then read by M3 for reporting any exceptions.

0 ToddMullanix over 12 years ago in reply to HardikShah

TI__Guru* 96960 points

The hook function can call Exception_getStatus() to get the register context at the time of the exception. For instance:

Void myInternalHook(Void)
{
    Exception_Status status;
    Ptr a31, a30;
    Ptr b31, b30;

Exception_getLastStatus(&status);

    System_printf("myInternalHook:\n");
    System_printf(" efr=0x%x\n", status.efr);
    System_printf(" nrp=0x%x\n", status.nrp);
    System_printf(" ntsr=0x%x\n", status.ntsr);
    System_printf(" ierr=0x%x\n", status.ierr);
    System_printf(" excContext=0x%x\n", status.excContext);
    a31 = status.excContext->A31;
    a30 = status.excContext->A30;
    b31 = status.excContext->B31;
    b30 = status.excContext->B30;
    System_printf(" A31_A30=0x%08x%08x\n",
                  (UInt)(a31),
                  (UInt)(a30));
    System_printf(" B31_B30=0x%08x%08x\n",
                  (UInt)(b31),
                  (UInt)(b30));
}

The 'status' structure is filled with exception info.

See the Exception module documentation for details.

0 HardikShah over 12 years ago in reply to ToddMullanix

TI__Mastermind 20245 points

Ok,

thanks a lot for information. Do you have similar things available for EVE also.

0 Ashish Kapania over 12 years ago in reply to HardikShah

TI__Mastermind 21645 points

Hi Hardik,

SYS/BIOS does not have Exception support for ARP32/EVE.

Best,

Ashish

0 HardikShah over 12 years ago in reply to Ashish Kapania

TI__Mastermind 20245 points

Hi,

Is there any plan of adding this. Or how can we raise the request to BIOS team to add this. This will be a required feature from both customer and vision_sdk point of view.

0 Ashish Kapania over 12 years ago in reply to HardikShah

TI__Mastermind 21645 points

Hi Hardik,

I have filed an enhancement request to add Exception support for ARP32.

Here's the CQ link:

https://cqweb.ext.ti.com/cqweb/main?command=GenerateMainFrame&service=CQ&schema=SDO-Web&contextid=SDOWP&entityID=SDOCM00103008&entityDefName=IncidentReport&username=readonly&password=readonly

Best,

Ashish

Processors

Processors forum

How to install exception handler for DSP