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33 There is an ENTRY instruction that does the rotation. It adds CALLINC
36 immediate offset from it to make space for the new frame.
38 There is a RETW instruction that undoes the rotation. It reads the
44 return value format and is used immediately, so it makes more sense
45 for it to use processor state instead.
51 WINDOWSTART stores a bitmask with one bit per hardware quad (so it's 8
56 each call frame that is live in hardware registers, and it will be
62 indicating it's valid. If it does not, the registers must have been
69 registers, but it's possible to hit registers 12 out from WINDOWBASE,
70 so it's actually possible to trap again when the instruction restarts
80 The advantage of the scheme above is that it allows the registers to
87 stack frame. It lies in the 16 bytes below its CALLEE's stack
100 depending on whether the call was made with CALL8/CALL12. It is legal