ARM · Assembly pseudo instructions-EEWORLD

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In the ARM assembler, there are several pseudo instructions:

*Symbol definition directive

*Data definition directives

* Assembly control directives

*Information reporting directive

*Macro instructions and other pseudo instructions

[Symbol definition pseudo instruction]

Define local variables LCLA, LCLL, LCLS

Define global variables GBLA, GBLL, GBLS

Assigning values to variables: SETA, SETL, SETS

[Data definition pseudo instruction]

DCB

DCW/DCWU

DCD/DCDU

DCQ/DCDU

DCFS/DCFSU

DCFD/DCFDU

SPACE

FIELD

MAP

*DCB expression is used to allocate a continuous range of bytes

*DCW/DCWU expressions are used to allocate a continuous half-word

*DCD/DCDU expressions are used to assign a continuous word

*DCQ/DCQU expression is used to allocate 8 consecutive bytes

*DCFD/DCFDU expression is used to allocate a continuous word storage unit for double-precision floating point numbers

*DCFS/DCFSU expression is used to allocate a continuous word storage unit for single-precision floating point numbers

*SPACE expression is used to allocate a continuous storage area and initialize it to 0. The expression is the number of bytes to be allocated.

*MAP FILED

MAP defines the first address of a structured memory table

[MAP 0x100, R0] First address 0x100+R0

FILED defines a data field in a structured memory table

[MAP 0x30000000

A FILED 4

B FILED 4

C FILED 4]

【Assembly control pseudo instructions】

*MACRO MEND macro name

*IF···ELSE···ENDIF [ | ]

*WHILE····WEND

*NEXIT Exit from macro

Some other pseudo instructions

*ASSERT logical expression

This condition must be met to compile

*ALIGN [expression[,offset]]

AREA Init, CODE, READONLY, ALIGN=3

*AREA segment name attribute

The DATA segment is READWRITE by default.

CODE code segment defaults to READONLY

*NOINIT memory unit initialized to 0

*ALIGN

*COMMON Common segment (excluding data segment and code segment)

*ENTRY

*END

*EQU (NUM EQU 100) (equivalent to #define in C language)

*EXPORT declares a global variable

IMPORT IMPORT Main (references the Main variable, but Main is not defined in this program)

EXPORT is the same as IMPORT, but if there is no reference in the source file, the label will not appear

*RN rename the register

temp RN R0

*GET/INCLUDE (equivalent to include in C language)

*INCBIN file name (this instruction will be considered in the program)

INCBIN 2440test.bin

*NOP

【About tags...】

【About the number...】

【Mixed programming of C/C++ and assembly language】

After using the embedded assembler, most ARM instructions and Thumb instructions can be used directly in the C/C++ source program

In ARM C language programs, the keyword _asm is used to identify an assembly instruction.

_asm

{

intstruction[; instrucition]

····

[instruction]

}

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