RealView® ARMulator® ISS User Guide 4.8.7. MRRC

This function is called when an MRRC instruction is recognized for a coprocessor.

The function must return ARMul_CP_CANT if:

unsigned MRRC(void *handle, int type, ARMword instr, ARMword *data)

where:

handle

is the handle from ARMulif_InstallCoprocessorV5.

type

is the type of the coprocessor access. This can be one of:

ARMul_CP_FIRST: indicates that this is the first time the coprocessor model has been called for this instruction.
ARMul_CP_BUSY: indicates that this is a subsequent call, after the first call was busy-waited.
ARMul_CP_INTERRUPT: warns the coprocessor that the ARM processor is about to service an interrupt, so the coprocessor must discard the current instruction. Usually, the instruction is retried later, in which case the type is reset to ARMul_CP_FIRST.
ARMul_CP_DATA: indicates valid data is included in data.

instr

is the current opcode.

data

is a pointer to the data being transferred from the coprocessor.

The function must return one of:

ARMul_CP_DONE, to indicate that the coprocessor operation is complete
ARMul_CP_BUSY, to indicate that the coprocessor is busy
ARMul_CP_CANT, to indicate that the instruction is not supported, or the specified register cannot be accessed.

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