patch to add semihosting control for remote arm targets

[Vadim Lebedev]

When debugging remote arm targets using  devices such as JEENI  from epitools 
the semihosting function slows execution by the target of SWI instruction 
nearly 100-fold.  This is especially annoying when you try to debug  linux 
kernel on the target as it uses SWI to implement system calls.  
The attached patch adds a set rdisemihosting {on/off/1/0/true/false} command 
to the gdb which allows one to enable or disable semihosting suppport.
the command shoud be executed before target rdi ....  command
The patch is against gdb 5.3 but i think will apply to older versions cleanly 
too.




Chang log entry

 Wed Mar 12 13:00:00 2003  Vadim Lebedev  (vadim at 7chips.com)

	* remote-rdi.c 		add set rdisemihosting command



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