7.3.10. DCI

In ARM code, the DCI directive allocates one or more words of memory, aligned on 4-byte boundaries, and defines the initial runtime contents of the memory.

In Thumb code, the DCI directive allocates one or more halfwords of memory, aligned on 2-byte boundaries, and defines the initial runtime contents of the memory.

Syntax

{label} DCI expr{,expr}

where:

expr

is a numeric expression (see Numeric expressions).

Usage

The DCI directive is very like the DCD or DCW directives, but the location is marked as code instead of data. Use DCI when writing macros for new instructions not supported by the version of the assembler you are using.

In ARM code, DCI inserts up to three bytes of padding before the first defined word, if necessary, to achieve 4-byte alignment. In Thumb code, DCI inserts an initial byte of padding, if necessary, to achieve 2-byte alignment.

See also DCD and DCDU and DCW and DCWU.

Example

    MACRO           ; this macro translates newinstr Rd,Rm
                    ; to the appropriate machine code
    newinst     $Rd,$Rm
    DCI         0xe16f0f10 :OR: ($Rd:SHL:12) :OR: $Rm
    MEND
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