hw7_csUML

COMP.2030 HW 7 Due 11/20 (Mon) Midnight For this assignment, which is a preparatory step to HW8 (binary bomb project), you need an account in the CS system. The CS account has the domain of cs.uml.edu, and looks like yourCSusername@cs.uml.edu (e.g. kim@cs.uml.edu ). Your UML account ??????@student.uml.edu would NOT work. 1. If you do not have a CS account, send an email to help@cs.uml.edu , indicating that you are in COMP.2030, or stop at DAN405 to sign up. 2. You can log into mercury server directly if you are on campus, but need to use a VPN if you access from home. The procedure for installing GlobalProtect is at https://www.uml.edu/it/services/get-connected/remote-access/ . 3. Login to mercury by typing in Power Shell (or putty in Windows) or MAC Terminal ssh -l yourCSusername mercury.cs.uml.edu Assignment a) Assignment b) What to submit: Merge two text files in Assignments a & b into a single file, and submit in BB. 1. Create a new file (emacs or vi) and enter the following function, and save it as sum.c . 2. Compile the file with ‘ gcc -S sum.c ’ command and check out if sum.s file is generated. 3. Copy the .s file into .txt file: ‘ cp sum.s sum.txt ’ 4. In the sum.txt file, remove all directives and keep only x86 executable instructions. 5. In the sum.txt file, add comments after most x86 instructionsn the pseudo-C style as you did in MIPS programs. int get_sum(int X[], int n){ int sum = 0; int i = 0; while (i < n){ sum = sum + X[i]; i++; } return sum; long switch_eg (long x, long y, long z) { long w = 1; switch(x) { case 1: w = y*z; break; case 2: w = y/z; /* Fall Through */ case 3: w += z; break; case 5: case 6: w -= z; break; default: w = 2; } return w; } Repeat the five steps in Assignment a) above for the function switch_eg on the right.