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  1. ; Area Definition and Entry Point
  2. AREA Reset, CODE, READONLY
  3. ENTRY
  4.  
  5. ; Exception Vectors
  6. Vectors     
  7.     LDR PC, Reset_Addr 
  8.     LDR PC, SWI_Addr 
  9.  
  10. Reset_Addr  DCD Reset_Handler 
  11. SWI_Addr    DCD SWI_Handler 
  12.  
  13. ; Reset Handler
  14. Reset_Handler 
  15.     MSR CPSR_C, #0x10          ; Set User mode (unprivileged mode)
  16.     LDR R1, =65090             ; Last 5 digits of BITS ID (65090)
  17.     LDR R2, =65090             ; Last 5 digits of BITS ID (65090)
  18.     SWI 0x090                  ; SWI number in hexadecimal (090 in decimal)
  19.  
  20. STOP    
  21.     B STOP 
  22.  
  23. ; SWI Handler
  24. SWI_Handler 
  25.     LDR SP, =0x40000100        ; Initialize stack pointer
  26.     STMFD SP!, {R1-R2}         ; Push parameters R1 and R2 to the stack
  27.  
  28.     ; Retrieve parameters from the stack
  29.     LDMFD SP!, {R1-R2}         ; Pop parameters from stack into R1 and R2
  30.  
  31.     ADD R3, R1, R2             ; Add values in R1 and R2, store result in R3
  32.  
  33.     MOVS PC, LR                ; Return from SWI, restoring the state
  34.  
  35. STOP1   
  36.     B STOP1 
  37.  
  38. END
  39.  
  40.  
Success #stdin #stdout 0.03s 25728KB
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; Area Definition and Entry Point
AREA Reset, CODE, READONLY
ENTRY

; Exception Vectors
Vectors     
    LDR PC, Reset_Addr 
    LDR PC, SWI_Addr 

Reset_Addr  DCD Reset_Handler 
SWI_Addr    DCD SWI_Handler 

; Reset Handler
Reset_Handler 
    MSR CPSR_C, #0x10          ; Set User mode (unprivileged mode)
    LDR R1, =65090             ; Last 5 digits of BITS ID (65090)
    LDR R2, =65090             ; Last 5 digits of BITS ID (65090)
    SWI 0x090                  ; SWI number in hexadecimal (090 in decimal)

STOP    
    B STOP 

; SWI Handler
SWI_Handler 
    LDR SP, =0x40000100        ; Initialize stack pointer
    STMFD SP!, {R1-R2}         ; Push parameters R1 and R2 to the stack

    ; Retrieve parameters from the stack
    LDMFD SP!, {R1-R2}         ; Pop parameters from stack into R1 and R2

    ADD R3, R1, R2             ; Add values in R1 and R2, store result in R3

    MOVS PC, LR                ; Return from SWI, restoring the state

STOP1   
    B STOP1 

END
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