[MIPS sim patch] sim_monitor cleanup

[Ben Elliston]

>>>>> "Andrew" == Andrew Cagney <ac131313@cygnus.com> writes:

  Andrew> Almost.  I'm fine with the theory just not the implementation.  Reading:

  Andrew> !          int reason = (instruction >> RSVD_INSTRUCTION_ARG_SHIFT) &
  Andrew> RSVD_INSTRUCTION_ARG_MASK;
  Andrew> !          if (sim_monitor (SD, CPU, cia, reason))
  Andrew> !            sim_io_error (sd, "TODO sim_monitor: reason = %d, pc =
  Andrew> 0x%s\n", reason, pr_addr (cia));

  Andrew> just looks wierd.

  Andrew> Could sim_monitor() return zero or negative to indicate fail (both are
  Andrew> more common conventions) and perhaphs change ``TODO'' to something more
  Andrew> meanginful :-)

Done.  I've negated the sense of sim_monitor()'s result and the error
message now reads:

  "sim_monitor: unhandled reason = %d, pc = 0x%s\n", reason, pr_addr (cia)

Okay to commit?

Ben