This SWI is obsolete. Use OS_ChangeEnvironment instead.
=> R0 = address of the handler for OS_Exit, 0 to read
R1 = address of the memory limit for OS_GetEnv, 0 to read
R4 = address for undefined instructions, 0 to read
R5 = address for prefetch abort, 0 to read
R6 = address for handler for data abort, 0 to read
R7 = address for handler for address exceptions, 0 to read
<= The used registers contain the previous handlers.
Internally, OS_SetEnv just calls OS_ChangeEnvironment.
See PRM 1, page 302.
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