[PATCH v3] score: PR1607: Add and use CPU_SIZEOF_POINTER

Sebastian Huber sebastian.huber at embedded-brains.de
Thu Nov 8 10:02:22 UTC 2012


On 11/08/2012 10:33 AM, Ralf Corsepius wrote:
> On 11/08/2012 09:27 AM, Sebastian Huber wrote:
>> Add and use new CPU port define CPU_SIZEOF_POINTER.  It must be an
>> integer literal that can be used by the assembler.  This value will be
>> used to calculate offsets of structure members.  These offsets will be
>> used in assembler code.
>>
>> The size of a pointer is part of the application binary interface (ABI)
>> and thus independent of the actual programming language.  The compiler
>> will provide defines to determine the current ABI.  We use these defines
>> to select the appropriate CPU_SIZEOF_POINTER value.
>>
>> Static assertions in the new file "cpukit/score/src/percpuasm.c" will
>> ensure that the value of CPU_SIZEOF_POINTER is consistent with the
>> current compiler settings.  Also the offset values used by assembler
>> code are verfied.
[...]
> It's just a random accident it appears to work for some targets.
[...]

In particular I am interested to know how you justify "random accident" if you 
look at the static assertions.

-- 
Sebastian Huber, embedded brains GmbH

Address : Obere Lagerstr. 30, D-82178 Puchheim, Germany
Phone   : +49 89 18 90 80 79-6
Fax     : +49 89 18 90 80 79-9
E-Mail  : sebastian.huber at embedded-brains.de
PGP     : Public key available on request.

Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.





More information about the devel mailing list