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From: "htm at lavabit dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug sim/14935] New: printf/swiwrite with arm-none-eabi target
 simulator only working on first run
Date: Sun, 09 Dec 2012 01:11:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14935

             Bug #: 14935
           Summary: printf/swiwrite with arm-none-eabi target simulator
                    only working on first run
           Product: gdb
           Version: 7.5
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sim
        AssignedTo: unassigned@sourceware.org
        ReportedBy: htm@lavabit.com
    Classification: Unclassified


Hello,
the printf behaviour with 7.5 and arm-none-eabi simulator is strange.
It will only show output on the very first run of the programm. Running it
again will show no further output.
To make it worse there seem to be two bugs:
SWIWrite (from armos.c) is only called after the first "run" after "load".
"run" again after a finished inferior will not call SWIWrite again.
This is workaroundable by calling "load" again, but then at the second run the
file descriptor is wrong:
armos.c:
res = sim_callback->write (sim_callback, f, local, len);
this will call through
callback.c
os_write
where a call to
fdbad
will return -1 and set error to EBADF because 
p->fd_buddy[fd] < 0

Until a real fix (the simulator seems to be not reinitialized well)
sim_callback->write_stdout (sim_callback, local, len);
can be substituted for the write.
But this still only works on the first run.

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