I'm in the process of porting a graphics library downloaded from avrfeaks.net from AVR Assembler to avr-as.
I'm now getting undefined references to PC. Does GAS not have a PC symbol defined? Can anyone point me to something that I'm doing wrong that would keep PC from not being defined? Can anyone suggest a work- around?
Thanks,
K
I know nothing about WINAVR, but PC is normally used to refer to the ProgramCounter. I suggest you read the source and see if this makes sense.
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[mail]: Chuck F (cbfalconer at maineline dot net)
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Try the download section.
On Sun, 03 Aug 2008 05:16:08 -0400, CBFalconer posted:
I just went through the user manual and didn't see a reference to PC, this despite a heckuva lot of windows stuff in there. When I read the original post, I was worried that winavr was going to make itself unaware of its own operating system. I think 'PC' is undefined in winavr.
-- What men value in this world is not rights but privileges. 7 H. L. Mencken
Are there any instructions that allow you to access the PC directly in any case?
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The PC (program counter) register is sometimes referred to as IP (instruction pointer). Same thing, different mnemonic traditions --- gas mostly follows the AT&T assembly syntax rather than the Intel assembly syntax, but I think for register names gas tries to follow the chip vendor's conventions, whatever they are for that particular CPU.
But as Richard/FreeRTOS says, is the PC (or IP) register even visible on AVRs? I don't think it is. What's the instruction you're running into trouble with?
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