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7-18 Copyright © 2000, 2001 ARM Limited. All rights reserved. ARM DUI 0068B
7.3.5 DCB
The
DCB
directive allocates one or more bytes of memory, and defines the initial runtime
contents of the memory.
=
is a synonym for
DCB
.
Syntax
{label} DCB expr{,expr}...
where:
expr
is either:
• A numeric expression that evaluates to an integer in the range –128
to 255 (see Numeric expressions on page 3-20).
• A quoted string. The characters of the string are loaded into
consecutive bytes of store.
Usage
If
DCB
is followed by an instruction, use an
ALIGN
directive to ensure that the instruction
is aligned. See ALIGN on page 7-50 for more information.
See also:
• DCD and DCDU on page 7-19
• DCQ and DCQU on page 7-24
• DCW and DCWU on page 7-25
• SPACE on page 7-17.
Example
Unlike C strings, ARM assembler strings are not null-terminated. You can construct a
null-terminated C string using
DCB
as follows:
C_string DCB "C_string",0