GDB default breakpoint instruction for SuperH

Hi,

I looked at this GDB (v6.4) source file: 
gdb/config/sh/tm-sh.h . In 
side, it specifies the default breakpoint instruction for
SH, which 
causes GDB to insert 0xc320 (trapa #32) into target when
breakpoint is 
set. See below:

#define DEPRECATED_BIG_REMOTE_BREAKPOINT    { 0xc3, 0x20 }
/* Used in 
remote.c *
/
#define DEPRECATED_LITTLE_REMOTE_BREAKPOINT { 0x20, 0xc3 }
/* Used in 
remote.c *
/

I wonder why by default 0x20 is used instead of other number
without 
knowing the target SuperH processor type ?

Thanks!

-- 
Best regards,
Min