Exceptions - DCE FEL ČVUT v Praze

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Y35PES – 7th lecture Writing an Interrupt Handler (5) void __irq irq_handler ( ) { } ... void main ( ) { } unsigned old_vec; unsigned *irq_vec = (unsigned *) 0x18; old_vec = install_handler ( (unsigned) irq_handler, (unsigned) irq_vec ); … 9/7/2010 © Ondřej Špinka 2007
Y35PES – 7th lecture Writing an Interrupt Handler (6) Registering a FIQ handler: To allow fastest possible FIQ reception and servicing, the FIQ vector is located at the very end of the vector table. Hence there is no need to perform any branch to the handler, instead the FIQ handler can (and should) begin directly at the FIQ vector address. This is achieved by copying the handler code directly to the address 0x1C. The ARM code is inherently relocatable, however, it must use PC relative addressing only (and therefore the data it uses must be relocated too). 9/7/2010 © Ondřej Špinka 2007
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Exceptions - DCE FEL ČVUT v Praze

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