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