multiple runs with sim target

[Mike Frysinger <vapier at gentoo dot org>]

i'm wondering if it's expected behavior that "run" with the sim target isnt 
terribly useful for multiple execution.

for example, the simple program:
main(int argc, char *argv[]) { puts(argv[0]); }

loaded up as so:
$ gdb ./a.out
(gdb) target sim
(gdb) load
(gdb) run
<works fine>
(gdb) run
<does not work fine>

this can be attributed to the "load" loading up the ELF contents into the 
relevant memory regions, but "run" only executes it.  so if the program 
modifies memory (such as .data), things dont get reloaded and behavior is not 
so nice.

based on the code, i guess this is expected behavior.  the trouble comes in 
with the gdb testsuites that explicitly try and verify that this works.  such 
as gdb.base/a2-run.exp.
-mike

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