omjavaid added a comment.

I am wondering whats the reason of replacing arm ptrace calls with aarch64 
specific calls that use iovec parameters.

If arm calls can work then may be dont use aarch64 specific calls at all. If 
they dont work kindly make relevant changes to 
NativeRegisterContextLinux_arm::WriteHardwareDebugRegs and 
NativeRegisterContextLinux_arm::ReadHardwareDebugInfo().
I guess these functions will throw same errors in case calls propagated using 
aarch64 lib interface and not backward compaitible with arm specific interface.


http://reviews.llvm.org/D15533



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