Datasheet

ARMulator Reference
4-18 Copyright © 1999-2001 ARM Limited. All rights reserved. ARM DUI0058D
4.4.3 STC
This function is called when an
STC instruction is recognized for a coprocessor.
Syntax
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 is about to
service an interrupt, so the coprocessor must
discard the current instruction. Usually, the
instruction will be retried later. In that case the
type
will be 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.
Return
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 needed for ARM9.