[PATCH 3/5] omap: Add support for CONFIG_AUTO_ZRELADDR for DEBUG_LL

[Nicolas Pitre]

On Fri, 4 Feb 2011, Tony Lindgren wrote:

> * Nicolas Pitre <nico at fluxnic.net> [110204 12:14]:
> > 
> > Just create a get_config_ptr macro or similar and the trickery will be 
> > nicely encapsulated.  You'd have:
> > 
> > 	.macro get_config_ptr ptr, tmp
> > 	b	9002f
> > 	.align
> > 9001:	.long	.
> > 	.long	uart_param_storage
> > 9002:	adr	\ptr, 9001b
> > 	ldr	\tmp, [\ptr]
> > 	sub	\tmp, \tmp, \ptr
> > 	ldr	\ptr, [\ptr, #4]
> > 	sub	\ptr, \ptr, \tmp
> > 	.endm
> > 
> > 	.macro addruart rp, rv
> > 	get_config_ptr \rv
> > 	ldr	\rp, [\rv]
> > 	ldr	\rv, [\rv, #4]
> > 	.endm
> > 
> > And for the other macros, you get the hardware address to use already, 
> > but you can still use get_config_ptr for extra config values you 
> > need if necessary.
> 
> Thanks, will try that out next week. That might run into problems with
> busyuart as it only has rd register to play with.

With some code auditing we could declare ip as being callee clobberable 
with those macros.


Nicolas