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12012/03/30 - Mark Hatle <mark.hatle@windriver.com>
2 - Initial Version
3
4MIPS currently defines 12 ABIs. Combinations of:
5 *) Big/Little Endian
6 *) Hardware/Software Floating Point
7 *) o32, n32, n64 ABI
8
9TUNE_ARCH, the GNU canonical arch, is defined as:
10
11mips${MIPSPKGSFX_BYTE}${MIPSPKGSFX_ENDIAN}
12
13The package arch is defined in such a way to generated a standard naming
14scheme. The scheme is: <mips variant>[-nf][-n32]
15
16TUNE_PKGARCH is defined as:
17
18${MIPSPKGSFX_VARIANT_tune-${DEFAULTTUNE}}${MIPSPKGSFX_FPU}${MIPSPKGSFX_ABI}
19
20The following is a list of MIPS specific variables:
21
22MIPSPKGSFX_BYTE - This is defined as either blank and "64" for MIPS64 CPUs.
23
24MIPSPKGSFX_ENDIAN - For bigendian hardware this is blank, otherwise it's
25defined as "el".
26
27MIPSPKGSFX_VARIANT_tune-<tune> - In the default tunings it is set to the
28same value as TUNE_ARCH. In custom, optimized tunings, the value should
29be modified to more precisely describe the tuning.
30
31MIPSPKGSFX_FPU - The value is set to "" or "-nf", where "-nf" indicates
32that the tune is using a non-floating point ABI.
33
34MIPSPKGSFX_ABI - This is used to specify an alternative ABI when the previous
35values are not enough to distringuish the package. "-n32" is added when
36building for N32 ABI.