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6.6 Nested Millicode Calls

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Millicode routines may call other millicode routines, but (at present) cannot call other standard user-defined routines. In order for nested millicode calls to occur, however, the millicaller must allocate a stack frame and save the MRP in the current RP word (SP-20) and sr0 in the static link word (SP-16) of the frame marker area of the new frame. The layout of a frame generated for a nested millicode call is shown in Figure 6-2.

Figure 6-2 Millicode Stack Storage Layout

[Figure 6-2]



6.5 Making a Millicode Call

Chapter 7 Stack Unwinding