[U-Boot] [PATCH 1/4] ARM: Add ARMv7-M support

[Tom Rini]

On Tue, Mar 31, 2015 at 12:06:29AM +0200, Andreas Färber wrote:
> Am 05.03.2015 um 16:32 schrieb Tom Rini:
> > On Sun, Mar 01, 2015 at 12:44:39PM +0100, Kamil Lulko wrote:
> > 
> >> Signed-off-by: Kamil Lulko <rev13 at wp.pl>
> > [snip]
> >> diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S
> > [snip]
> >> @@ -66,15 +69,30 @@ ENTRY(_main)
> >>  #else
> >>  	ldr	sp, =(CONFIG_SYS_INIT_SP_ADDR)
> >>  #endif
> >> +#if defined(CONFIG_CPU_V7M)	/* v7M forbids using SP as BIC destination */
> >> +	mov	r3, sp
> >> +	bic	r3, r3, #7
> >> +	mov	sp, r3
> >> +#else
> >>  	bic	sp, sp, #7	/* 8-byte alignment for ABI compliance */
> >> +#endif
> > 
> > There's 4 places where this change comes in.  Albert, what do you think
> > about always just doing this in 3 instructions with a comment in the
> > first instance about v7-M support?
> 
> I remember running into problems like these when working on STM32F429
> support late last year and I adopted some helper macros from Linux, I
> believe. The same problem existed in U-Boot's private libgcc code.

What macros did you use from the kernel?  Thanks!

-- 
Tom
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