[PATCH 0/3] target/m68k: Fix a few semihosting bugs

[Keith Packard]

The first two patches mirror similar patches I recently sent for nios2.

 1. Use correct parameter for EXIT (d1 instead of d0)
 2. Fix use of deposit64 in LSEEK (argument order was incorrect)

The second patch has also been submitted by Peter Maydell, it's
included here because it was required to get things working.

The final patch adds semihosting support for non-ColdFire processors
(which don't support the HALT instruction) by using BKPT #0 instead
(as per the m68k semihosting docs).

All of these have been tested using picolibc (patches for m68k support
there are moving upstream as well).