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

On Fri, 4 Feb 2011, Tony Lindgren wrote:

* Nicolas Pitre [off-list ref] [110204 12:14]:

quoted

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