Created final ch-02 file LongAddition.s

ch-02/LongAddition.s

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+@
+@ Example of 64-bit addition with
+@       the ADD/ADC instructions.
+@
+
+.global _start      @ Provide program starting address
+
+@ Load the registers wit some data.
+@ First 64-bit number is 0x00000003FFFFFFFF
+_start:
+    MOV     R2, #0x00000003
+    MOV     R3, #0xFFFFFFFF     @ as; will change to MVN
+
+@ Second 64-bit number is 0x0000000500000001
+    MOV     R4, #0x00000005
+    MOV     R5, #0x00000001
+
+    ADDS    R1, R3, R5          @ Lower order word
+    ADC     R0, R2, R4          @ Higher order word
+
+@ Set up the parameters to exit the program
+@ and then call Linux to do it.
+@ R0 is the return code and will be wha we
+@ calculated above.
+    MOV     R7, #1              @ Service command code 1
+    SVC     0                   @ Call Linux to terminate