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NAME
- GetCC
-
get condition codes in a 68010 compatible way.
SYNOPSIS
conditions = GetCC()
UWORD GetCC(void);
D0
FUNCTION
The 68000 processor has a "MOVE SR,<ea>" instruction which gets a copy of the processor condition codes.
On the 68010,20 and 30 CPUs, "MOVE SR,<ea>" is privileged. User code will trap if it is attempted. These processors need to use the "MOVE CCR,<ea>" instruction instead.
This function provides a means of obtaining the CPU condition codes in a manner that will make upgrades transparent. This function is VERY short and quick.
On the 68010,20 and 30 CPUs, "MOVE SR,<ea>" is privileged. User code will trap if it is attempted. These processors need to use the "MOVE CCR,<ea>" instruction instead.
This function provides a means of obtaining the CPU condition codes in a manner that will make upgrades transparent. This function is VERY short and quick.
RESULT
- conditions
-
the 680XX condition codes
NOTES
This call is guaranteed to preserve all registers. This function may be implemented as code right in the jump table.