When this is executed, all user mode registers are saved into a block and the BreakPoint handler is called. The saved registers are only guaranteed to be correct for user mode. The default handler displays the message 'Break point at &xxxxx' and calls OS_Exit. This SWI would be placed in code by the debugger at required breakpoints.
The handler can be changed with OS_ChangeEnvironment.
See PRM 1, page 305.
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