Use any ARM assembly program you like but the Keil simulator would be nice.

Sample code:

;;; Directives

PRESERVE8

THUMB

; Vector Table Mapped to Address 0 at Reset

; Linker requires __Vectors to be exported

AREA RESET, DATA, READONLY

EXPORT __Vectors

__Vectors

DCD 0x20001000 ; stack pointer value when stack is empty

DCD Reset_Handler ; reset vector

ALIGN

; The program

; Linker requires Reset_Handler

AREA MYCODE, CODE, READONLY

ENTRY

EXPORT Reset_Handler

Reset_Handler

;;;;;;;;;;User Code Starts from the next line;;;;;;;;;;;;

MOV R0, #12

STOP

ADD R0, R0, #4

B STOP

END ;End of the program

;;; Directives PRESERVES THUMB ; Vector Table Mapped to Address O at Reset ; Linker requires Vectors to be exported AREA EXPORT RESET, DATA, READONLY Vectors Vectors DCD DCD Ox20001000 Reset Handler ; stack pointer value when stack is empty reset vector ALIGN ; The program ; Linker requires Reset_Handler AREA MYCODE, CODE, READONLY ENTRY EXPORT Reset_Handler Reset_Handler ;;;;;; User Code Starts from the next line; ; ; ; ; MOV RO, #12 STOP ADD RO, RO, #4 B STOP END ; End of the program ;;; Directives PRESERVES THUMB ; Vector Table Mapped to Address O at Reset ; Linker requires Vectors to be exported AREA EXPORT RESET, DATA, READONLY Vectors Vectors DCD DCD Ox20001000 Reset Handler ; stack pointer value when stack is empty reset vector ALIGN ; The program ; Linker requires Reset_Handler AREA MYCODE, CODE, READONLY ENTRY EXPORT Reset_Handler Reset_Handler ;;;;;; User Code Starts from the next line; ; ; ; ; MOV RO, #12 STOP ADD RO, RO, #4 B STOP END ; End of the program