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SWI interrupt (SVC) on ARM Cortex A9

Note: This was originally posted on 9th February 2011 at http://forums.arm.com

Hi,
Right now I'm trying to access some CP15 registers (ARM Cortex A9). And these registers can be accessed only in privileged mode which is normal. Actually I dont know how to change from user mode to svc mode easily. I read that we can use SW interrupt but how can I attach my handler function to the SWI? can I just write to the address 0x08 the pointer to the handler?
Thanks for your time.

Dhananjay Ransing over 12 years ago

Note: This was originally posted on 16th March 2011 at http://forums.arm.com

That means we have to branch to any perticular handler (system / supervisor mode) from location 0x08 again, right??
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Martin Weidmann over 12 years ago

Note: This was originally posted on 9th February 2011 at http://forums.arm.com

Pretty much.

When execute an SVC instruction (SWI is the old name) the processor will switch to Supervisor mode, and branch to address 0x8*. So at address 0x8 you need a branch to your handler code.

* Technically it will be vector base address +0x8. The default location is 0x0.
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Martin Weidmann over 12 years ago

Note: This was originally posted on 16th March 2011 at http://forums.arm.com

yes
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