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

[Andreas Färber]

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.

Regards,
Andreas

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