2012/03/30 - Mark Hatle <mark.hatle@windriver.com>
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- Initial Revision
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The ARM architecture definitions are split among a number of files.
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The primary definitions for the variables are handled by the core
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arch-arm.inc file.
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TUNE_ARCH is set to either "arm" or "armeb" depending on the value
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of the existence of the "bigendian" feature in a given tune.
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A small set of ARM specific variables have been defined to allow
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TUNE_PKGARCH to be automatically defined. Optimized tunings must NOT
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change the definiton of TUNE_PKGARCH. TUNE_PKGACH:tune-<tune> will be
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ignored. The format of the package arch is enforced by the TUNE_PKGARCH
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default. The format must be of the form:
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<armversion>[t][e][hf][b][-vfp][-neon]
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TUNE_PKGARCH is defined as:
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${ARMPKGARCH}${ARMPKGSFX_THUMB}${ARMPKGSFX_DSP}${ARMPKGSFX_EABI}${ARMPKGSFX_ENDIAN}${ARMPKGSFX_FPU}
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ARMPKGARCH - This is the core package arch component specified by each
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tuning. This is the primary identifier of a tuning. Usual values are:
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arm, armv4, armv5, armv6, armv7a, etc.
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ARMPKGSFX_THUMB - This is the thumb specific suffix. Curently it is
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defined in feature-arm-thumb.inc.
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ARMPKGSFX_DSP - This is the DSP specific suffix. Currently this is set
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to 'e' when on armv5 and the dsp feature is enabled.
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ARMPKGSFX_EABI - This is the eabi specific suffix. There are currently
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two defined ABIs specificed, standard EABI and Hard Float (VFP) EABI.
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When the callconvention-hard is enabled, "hf" is specified, otherwise it
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is blank.
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ARMPKGSFX_ENDIAN - This is the endian specific suffix. It is defined in
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the core arch-arm.inc file.
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ARMPKGSFX_FPU - This is the FPU specific suffix. The suffix indicates
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specific FPU optimizations. 'vfp' and 'neon' are both defined.
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