MIPS Assembly Language Programming

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Chapter 5 MIPS Assembly Code Examples by Daniel J. Ellard The following sections include the source code for several of the programs referenced by the tutorial. All of this source code is also available online. For the convenience of the reader, the source code is listed here along with line numbers in the left margin. These line numbers do not appear in the original code, and it would be an error to include them in your own code. 69
70 CHAPTER 5. MIPS ASSEMBLY CODE EXAMPLES 5.1 add2.asm This program is described in section 2.4. 1 ## Daniel J. Ellard -- 02/21/94 2 ## add2.asm-- A program that computes and prints the sum 3 ## of two numbers specified at runtime by the user. 4 ## Registers used: 5 ## $t0 - used to hold the first number. 6 ## $t1 - used to hold the second number. 7 ## $t2 - used to hold the sum of the $t1 and $t2. 8 ## $v0 - syscall parameter and return value. 9 ## $a0 - syscall parameter. 10 11 main: 12 ## Get first number from user, put into $t0. 13 li $v0, 5 # load syscall read_int into $v0. 14 syscall # make the syscall. 15 move $t0, $v0 # move the number read into $t0. 16 17 ## Get second number from user, put into $t1. 18 li $v0, 5 # load syscall read_int into $v0. 19 syscall # make the syscall. 20 move $t1, $v0 # move the number read into $t1. 21 22 add $t2, $t0, $t1 # compute the sum. 23 24 ## Print out $t2. 25 move $a0, $t2 # move the number to print into $a0. 26 li $v0, 1 # load syscall print_int into $v0. 27 syscall # make the syscall. 28 29 li $v0, 10 # syscall code 10 is for exit. 30 syscall # make the syscall. 31 32 ## end of add2.asm.
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