Commits on Jul 28, 2022

1. SingleRegisterAccess: Support unavailable regs …

   Enable an implementation of SingleRegisterAccess to signal to gdbstub
   that a read register is recognized (as per RegId::from_raw_id()) but
   is unavailable by reporting a 0-byte read.
   
   In that case, make gdbstub report to the GDB client the state of the
   unavailable register by following the registers packet protocol:
   
   > [...] the stub may also return a string of literal `x`s in place of
   > the register data digits, to indicate that the corresponding register
   > has not been collected, thus its value is unavailable.
   
   Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>

   

   ptosi committed Jul 28, 2022
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