RealView® ARMulator® ISS User Guide 4.8.3. STC

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

unsigned STC(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 that case the type is reset to ARMul_CP_FIRST.
ARMul_CP_DATA: indicates that the coprocessor must return valid data in *data.

instr

is the current opcode.

data

is a pointer to the location of the data being saved to memory.

The function must return one of:

ARMul_CP_INC, to indicate that there is more data to transfer to the core (only in response to ARMul_CP_FIRST, ARMul_CP_BUSY, or ARMul_CP_DATA).
ARMul_CP_DONE, to indicate that the coprocessor operation is complete (only in response to ARMul_CP_DATA).
ARMul_CP_BUSY, to indicate that the coprocessor is busy (only in response to ARMul_CP_FIRST or ARMul_CP_BUSY).
ARMul_CP_CANT, to indicate that the instruction is not supported, or the specified register cannot be accessed (only in response to ARMul_CP_FIRST or ARMul_CP_BUSY).
ARMUL_CP_LAST, to indicate that the next save is the last in the sequence. This is only required for ARM9.

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