gdb.info: Pointer values

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Pointer values

Pointers to target data are transmitted as they are.  An exception is
made for pointers to buffers for which the length isn't transmitted as
part of the function call, namely strings.  Strings are transmitted as
a pointer/length pair, both as hex values, e.g.
     `1aaf/12'
which is a pointer to data of length 18 bytes at position 0x1aaf.  The
length is defined as the full string length in bytes, including the
trailing null byte.  Example:
     ``hello, world'' at address 0x123456
is transmitted as
     `123456/d'