📄 icall32.asm
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;******************************************************************************
;* ICALL32.ASM - 32 BIT STATE - v2.54 *
;* Copyright (c) 1996-2004 Texas Instruments Incorporated *
;******************************************************************************
;****************************************************************************
;* IND_CALL - PERFORM INDIRECT CALL, SUPPORTING DUAL STATE INTERWORKING
;*
;****************************************************************************
;*
;* o ADDRESS OF CALLED FUNCTION IS IN r4
;* o r4 GETS DESTROYED
;*
;****************************************************************************
.state32
.global IND_CALL
IND_CALL: .asmfunc
TST r4, #1 ; TEST STATE OF DESTINATION
BNE ep_16 ;
BX r4 ; INDIRECT CALL TO 32BIS ENTRY POINT
ep_16: MOV ip, r4 ; FREE r4 BY STORING ITS VALUE IN ip
MOV r4, lr ; STORE RETURN ADDRESS IN r4
ADD lr, pc, #1 ; SETUP NEW RETURN ADDRESS
BX ip ; INDIRECT CALL TO 16BIS ENTRY POINT
.state16
BX r4 ; RETURN
NOP ;
.state32
.endasmfunc
.end
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