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/ * -- HelloWorld -- */

.global _start

_start:

mov r0, #1

ldr r1, =string1

mov r2, #13

mov r7, #4

swi 0

mov r7, #1

swi 0

.data

string1:

.ascii "Hello World! "

------------------------------------------------------------------------------

Modify theHello World program above so that it asks the user for their first initial (e.g. T) and then responds with Hi _! (e.g. Hi T!). The Linux system call to read is Syscall 3, just as with the other calls you put 3 into R7 to indicate the system call number. When you use this call, the system looks for the device to read from in R0 (0 = keyboard), looks to R2 for the number of characters to read (in this case 1) and places the characters into memory starting with the address in R1