Computer Systems: A Programmer's Perspective (3rd Edition)
Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 11.3, Problem 11.1PP
Program Plan Intro

IP addresses:

  • The IP address denotes an unsigned integer that is 32-bit.
  • The IP addresses is been stored by network programs in IP address structure.
  • The addresses present in IP address structure are stored in network byte order.
  •  An unsigned 32-bit integer is converted from host byte order to network byte order by “htonl” function.
  • An unsigned 32-bit integer is converted from network byte order host byte order by “ntohl” function.
  • The IP address is presented to humans in a form known as “dotted-decimal” notation.
    • Each byte is been represented by its corresponding decimal value and is separated by a period from other bytes.

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(c) The following Sigma 16 program has been loaded into memory at address 0000: load R3,y[RO] load R4,x[RO] lea R5, 2[RO] sub R1,R4,R3 mul R2,R1,R5 store R2,w[RO] trap RO,RO,RO x data 10 y data 12 w data 0 Show the content of the memory writing hexadecimal representation and using a table with 3 columns: the memory address, the contents of that memory address, and an explanation of what "the content (of that memory address) means". As a reference, here are the opcodes for RRR instructions: add 0, sub 1, mul 2, trap c. And here the opcodes for RX instructions: lea 0, load 1, store 2. [7]
4. The following problems deal with translating from C code to MIPS code or MIPS code to C code. Assume that the signed variables f, g, h and i are assigned to registers $s0, $1, $2, $3 respectively. Assume the base address of the integer arrays A and B are in registers $s4 and $55 respectively. Translate the following MIPS code to C code. Please indicate which elements of integer array A and B are modified by this code. addi $t0, $1, 6 sll $t0, $t0, 4 add $t0, $t0, $5 Iw $t0, 0($t0) sw $t0, 4($4)
Problem 1. This problem is about operand modes, in particular about memory addressing using the operand modes described in lecture and the textbook. The following shows the contents of a portion of the program memory (locations Ox10000 through 0x10040), and certain registers. All contents are 64-bit quantities. Address Memory Contents 0x10040 0x10038 0x10030 0x10028 0x10020 0x10018 0x10010 0x10008 0x10000 a. movq (%rdi), %rax b. movq (%rdi,%rsi), %rax 100 0x10040 200 25 0x10028 0x10020 c. movq 8(%rdi, %rcx, 4) %r8 d. movq -8(%rdi,%rsi), rbx 500 0x10018 2 Register Contents %rdi 0x10008 %rsi %rdx %rcx For each of the following instructions, say what value ends up in the destination register. Each instruction starts with the state shown above, i.e., the effects do not accumulate. 0x20 8 4
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