In remote ptrace mode, we currently use PTRACE_PEEKUSER to read the registers.
PTRACE_PEEKUSER only works on x86 or arm 32 bit compatibility mode on linux. On aarch64 system,
it always return -EIO. https://github.com/torvalds/linux/blob/master/kernel/ptrace.c#L885-L1102
PTRACE_GETREGSET is the newer and more supported way of reading registers. Use that if it's available.
2004/11/23 16:59:56-08:00 mostang.com!davidm
(_UPT_access_reg): If the register is out of range, set errno
to EINVAL.
When encountering an error while accessing a register,
print the corresponding error string.
(Logical change 1.290)
