Datasheet

ARMulator Reference
ARM DUI0058D Copyright © 1999-2001 ARM Limited. All rights reserved. 4-17
4.4.2 LDC
This function is called when an
LDC instruction is recognized for a coprocessor.
Syntax
unsigned LDC(void *handle, int type, ARMword instr, ARMword *data)
where:
handle is the handle from ARMulif_InstallCoprocessorV5 .
type is the type of 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_TRANSFER
indicates that the ARM is about to perform the load.
ARMul_CP_DATA indicates that valid data is included in data .
instr the current opcode.
data is a pointer to the data being loaded to the coprocessor from memory.
Return
The function must return one of:
•
ARMul_CP_INC , to request more data from 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 load is the last in the sequence. This is only
needed for ARM9.