This SWI is obsolete. Use OS_ChangeEnvironment instead.
=> R0 = address of the register save block, 0 to read
R1 = address of the control routine, 0 to read
<= R0 = address of previous register save block
R1 = address of previous control routine
V is always clear
This sets up the address of the BreakPoint handler and the register save block, zero for either value meaning no change - hence you can read the current value. Internally, OS_BreakCtrl just calls OS_ChangeEnvironment.
See PRM 1, page 306.
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