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the alias fp is only supported on some assemblers. use the actual
register name x29 instead.
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This just mirrors what is done in the start code for the affected
ports, as well as what is already done for the three x86 ports.
Clearing the frame pointer helps protect FP-based unwinders from
wrongly attempting to traverse into the parent thread's call frame
stack.
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these are not a public interface and are not intended to be callable
from anywhere but the public clone function or other places in libc.
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This adds complete aarch64 target support including bigendian subarch.
Some of the long double math functions are known to be broken otherwise
interfaces should be fully functional, but at this point consider this
port experimental.
Initial work on this port was done by Sireesh Tripurari and Kevin Bortis.
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