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Re: [PATCH 00/12] S390: Implement __fentry__

On 08/02/2018 09:57 AM, Ilya Leoshkevich wrote:

This patch series adds the runtime support in glibc for the -mfentry
gcc feature introduced in [1] and [2].

Patches 1-9 deal with avoiding clobbering %r0 when calling lazily bound
functions, so that the new __fentry__ symbol could be called with return
address in that register.
Should GCC arrange for suitable ABI markup if -mfentry is used? I'm worried that unexpected clobbers of r0 could be quite difficult to figure out otherwise. 

Thanks,
Florian
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