Re: [PATCH 1/2] elf loader support for auxvec base platform string

On Thu, 2008-07-03 at 19:19 -0700, Roland McGrath wrote:

Why not just use ELF_HWCAP for this?  It looks like powerpc only has 3 bits
left there (keeping it to 32), but 3 is not 0.  If not that, why not use
dsocaps?  That is, some magic in the vDSO, which glibc already supports on
all machines where it uses the vDSO.  (For how it works, see the use in
arch/x86/vdso/vdso32/note.S for CONFIG_XEN.)

Well, we use strings to represent the platforms already (ie, the actual
CPU microarchitecture). Fitting those into bits would be annoying, it
makes sense to have AT_BASE_PLATFORM to be the "base" variant of
AT_PLATFORM.

_However_ there is a bug in that this patch adds an entry without
bumping the number of entries in the cached array (ie.
AT_VECTOR_SIZE_BASE needs to be updated).

Ben.