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the ctr and xer special registers are call-clobbered and
syscall-clobbered. failure to include them in the clobber list may
result in wrong code that attempts to use a value which is no longer
present in the register after the syscall. this has been reported to
manifest newly with gcc 15.
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symbol names and versions obtained from vdso(7) man page.
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without this, the SO_RCVTIMEO and SO_SNDTIMEO socket options would
stop working on pre-5.1 kernels after time_t is switched to 64-bit and
their values are changed to the new time64 versions.
new code is written such that it's statically unreachable on 64-bit
archs, and on existing 32-bit archs until the macro values are changed
to activate 64-bit time_t.
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