[PATCH] sh: pread/pwrite doesn't handle negative offset correctly

[Carmelo AMOROSO]

Hi All,
running LTP test suite on uClibc-nptl for sh4 I found a bug into pread 
and pwrite
functions.
When the offset is negative it is not correctly handled due to a missing 
shift operation,
so it is passed to the syscall as the highest unsigned positive value.
Same bug occurs into trunk.
Attached patch fixes the trunk code (libc/sysdeps/linux/sh/pread_write.c)

Regards,
Carmelo
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