[Contents] [Index] [Help] [Retrace] [Browse <] [Browse >]


NAME
    GetCC -- get condition codes in a 68010 compatible way.

SYNOPSIS
    conditions = GetCC()
      D0

    UWORD GetCC(void);

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.

RESULTS
    conditions - the 680XX condition codes

NOTE
    This call is guaranteed to preserve all registers.  This function
    may be implemented as code right in the jump table.


[Back to Amiga Developer Docs]