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Assembler User Guide
Preface
Overview of the Assembler
Overview of the ARM Architecture
Structure of Assembly Language Modules
Writing ARM Assembly Language
Condition Codes
Using the Assembler
Symbols, Literals, Expressions, and Operators
VFP Programming
Assembler Command-line Options
ARM and Thumb Instructions
VFP Instructions
Directives Reference
Alphabetical list of directives
About assembly control directives
About frame directives
ALIAS
ALIGN
AREA
ARM or CODE32
ASSERT
ATTR
CN
CODE16
COMMON
CP
DATA
DCB
DCD and DCDU
DCDO
DCFD and DCFDU
DCFS and DCFSU
DCI
DCQ and DCQU
DCW and DCWU
DN and SN
END
ENDFUNC or ENDP
ENTRY
EQU
EXPORT or GLOBAL
EXPORTAS
FIELD
FRAME ADDRESS
FRAME POP
FRAME PUSH
FRAME REGISTER
FRAME RESTORE
FRAME RETURN ADDRESS
FRAME SAVE
FRAME STATE REMEMBER
FRAME STATE RESTORE
FRAME UNWIND ON
FRAME UNWIND OFF
FUNCTION or PROC
GBLA, GBLL, and GBLS
GET or INCLUDE
IF, ELSE, ENDIF, and ELIF
IMPORT and EXTERN
INCBIN
INFO
KEEP
LCLA, LCLL, and LCLS
LTORG
MACRO and MEND
MAP
MEXIT
NOFP
OPT
RELOC
REQUIRE
REQUIRE8 and PRESERVE8
RLIST
RN
ROUT
SETA, SETL, and SETS
SPACE or FILL
THUMB
THUMBX
TTL and SUBT
WHILE and WEND
Via File Syntax
SPACE or FILL
| Non-Confidential |  PDF version | ARM DUI0379H | ||
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12.64 SPACE or FILL
The SPACE directive reserves a zeroed block of memory. The FILL directive reserves a block of memory to fill with a given value.
Syntax
{labelSPACE expr
{labelFILL expr{,value{,valuesize}} where:
label- is an optional label.
expr- evaluates to the number of bytes to fill or zero.
value- evaluates to the value to fill the reserved bytes with.
valueis optional and if omitted, it is 0.valuemust be 0 in aNOINITarea. valuesize- is the size, in bytes, of
value. It can be any of 1, 2, or 4.valuesizeis optional and if omitted, it is 1.
Usage
Use the
ALIGN directive to align any
code following a SPACE or FILL directive.% is a synonym for SPACE.Example
AREA MyData, DATA, READWRITE data1 SPACE 255 ; defines 255 bytes of zeroed store data2 FILL 50,0xAB,1 ; defines 50 bytes containing 0xAB
Related concepts
| Non-Confidential | PDF version | ARM DUI0379H |
| Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved. |
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