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sherlock 2025-08-28 10:11:40 +05:30
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ES/Lab/Lab1/Init2/DATATRANSFER.asm
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AREA RESET,DATA,READONLY
EXPORT __Vectors
; ========================================================================================
; DATATRANSFER.asm - Memory-Based Data Transfer Operations Demonstration
; ========================================================================================
; This program demonstrates how to transfer data from memory locations to registers
; using ARM load instructions. It shows the difference between loading an address
; and loading the actual data stored at that address.
__Vectors
DCD 0x10001000
DCD Reset_Handler
ALIGN
AREA mycode,CODE,READONLY
ENTRY
EXPORT Reset_Handler
AREA RESET,DATA,READONLY ; Define a read-only data section for the vector table
EXPORT __Vectors ; Export the vector table for external linking
__Vectors ; Start of the vector table
DCD 0x10001000 ; Stack pointer initial value (points to top of stack)
DCD Reset_Handler ; Address of the reset handler (program entry point)
ALIGN ; Ensure proper alignment for the next section
AREA mycode,CODE,READONLY ; Define the code section as read-only
ENTRY ; Mark the entry point of the program
EXPORT Reset_Handler ; Export the reset handler function
; ========================================================================================
; Reset_Handler - Main program execution
; ========================================================================================
; This function demonstrates memory data transfer operations:
; 1. Load the address of a data array into a register
; 2. Load the actual data from that memory location
; 3. Load an immediate negative value for comparison
Reset_Handler
LDR R0, =SRC ; gives memory address of SRC array
LDR R1, [R0] ; writes from first location of SRC array
MOV R5, -8;
; Step 1: Load memory address into register
; LDR with = syntax loads the address of the SRC array into R0
; This gives us a pointer to the beginning of the data array
LDR R0, =SRC ; R0 = address of SRC array
; Step 2: Load data from memory location
; LDR with [] syntax loads the actual data stored at the address in R0
; This reads the first 32-bit word from the SRC array (0x12345678)
LDR R1, [R0] ; R1 = data at address in R0 (first element of SRC)
; Step 3: Load immediate negative value
; MOV instruction loads the immediate negative value -8 into R5
; This demonstrates mixing memory loads with immediate loads
MOV R5, -8 ; R5 = -8 (immediate negative value)
; Step 4: Program termination
; Create an infinite loop to stop program execution
STOP
B STOP
ALIGN;
B STOP ; Branch to STOP label (infinite loop)
ALIGN ; Ensure proper alignment for data section
; ========================================================================================
; Data Section - Source data array
; ========================================================================================
; SRC array contains three 32-bit words in hexadecimal format:
; - First word: 0x12345678 (305419896 in decimal)
; - Second word: 0xABCDEF55 (2882400341 in decimal)
; - Third word: 0x55 (85 in decimal)
SRC DCD 0x12345678, 0xABCDEF55, 0x55
END ;
END ; End of the assembly program