=> R0 = context pointer (-2 for current context)
R1 = pointer to 25-word register dump
R2 = PC value associated with the context
<= R0 = non-zero if there is a pending or incompletely processed exception associated with the context, zero if there isn't
This call saves the register and FPSR values held in a floating point context to a specified 25-word area of memory, in the following format:
Offset Value
0 FPSR value
4 F0 value, as an extended precision number
16 F1 value, as an extended precision number
28 F2 value, as an extended precision number
40 F3 value, as an extended precision number
52 F4 value, as an extended precision number
64 F5 value, as an extended precision number
76 F6 value, as an extended precision number
88 F7 value, as an extended precision number
Note that it does this without processing any pending exceptions
associated with the context, or completing the processing of any
exception which is currently being processed. The routine returns a hint
about whether there is a pending or incompletely processed exception
associated with the context: if there is, the values returned may be
rather odd and should not be relied upon as an accurate reflection of
reality. For instance, if the FPA has a pending overflow exception, the
destination register of the instruction concerned will often read as
containing a very small number!
This call might be used by a debugger to view the current FP register
contents. The PC value passed in would then be the address at which
execution was interrupted - it is used to detect whether the
floating point system was interrupted in the middle of processing an
exception.
Contexts are only available from FPEmulator 4.12 and later.
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