Datasheet

ARMulator Reference
ARM DUI0058D Copyright © 1999-2001 ARM Limited. All rights reserved. 4-21
4.4.6 MCRR
This function is called when an
MCRR instruction is recognized for a coprocessor.
The function must return
ARMul_CP_CANT if:
• the requested coprocessor register does not exist
• the requested coprocessor register cannot be written to
• the coprocessor is ARM architecture v4T or earlier.
Syntax
unsigned MCRR(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 is about to
service an interrupt, so the coprocessor must
discard the current instruction. Usually, the
instruction will be retried later, in which case the
type will be 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 to the coprocessor.
Return
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.