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Re: [avr-gcc-list] 2 tricky questions
From: |
Christian Vogel |
Subject: |
Re: [avr-gcc-list] 2 tricky questions |
Date: |
Wed, 18 Jun 2003 18:00:50 +0200 |
User-agent: |
Mutt/1.2.5.1i |
On Tue, Jun 17, 2003 at 10:44:04PM +0800, Kang Tin LAI wrote:
> 2) Is it possible to link user defined (my) interrupt prologue and epilogue
> functions instead of the integrated ones ?
You can declare the function with the "naked" attribute.
__attribute__((naked)) SIGNAL(XXX){
asm("..."); /* <--- your prologue */
/* your code */
asm("..."); /* <--- your epilogue */
}
Which will leave the usual prologue (push r0, in r0,0x3f, ...)
and epilogue ("..., pop r0, reti") out of the compiler-generated
assembly-code.
*BUT*: You will have to take care of all register the
compiler might decide to use in /* your code */ and save
them to the stack... and those registers might change
whenever you install a new version of gcc for example. So one can
argue that it does not make much sense to mix a naked function
with c-code but rather write the whole routine in assembler then...
So in consequence you might even declare this function in a
external assembler-file which can be easier to maintain...
Chris
- Re: [avr-gcc-list] 2 tricky questions, (continued)
- Re: [avr-gcc-list] 2 tricky questions, Joerg Wunsch, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Marko Panger AGB Lab, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Joerg Wunsch, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Marko Panger AGB Lab, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Iztok Zupet, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Marko Panger AGB Lab, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Joerg Wunsch, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Marko Panger AGB Lab, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Joerg Wunsch, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions, Kang Tin LAI, 2003/06/17
- Re: [avr-gcc-list] 2 tricky questions,
Christian Vogel <=
- Re: [avr-gcc-list] 2 tricky questions, Joerg Wunsch, 2003/06/17
Re: [avr-gcc-list] 2 tricky questions, Julius Luukko, 2003/06/17