Computer Systems: A Programmer's Perspective339/ 1078267%+3.66You are charged with maintaining a large C program, and you come across thefollowing code:1typedef struct {2int left;a_struct a [CNT];int right;345} b_struct;7void test (int i, b_struct *bp)8{bp->left + bp->right;&bp->a[i];9.int n =10a_struct *ap =ap->x [ap->idx] = n;1112}II Computer Systems: A Programmer's Perspective340/ 1078231%+100000000 :%ebp%esp,%ebpOx8(%ebp),%eaxOxc (%ebp),%ecx(%eax,%eax,4),%eax20:55push1:89 e5mov43:8b 45 08mov6:8b 4d Ocmov9:8d 04 80leaОх4 (%eсx, %eaах, 4) ,%eaxOxb8 (%ecx),%edx(%ecx),%edx%edx,0x8 (%ecх,%eax,4)%ebp03 44 81 048b 91 b8 00 00 007C:add810:mov16:03 11add1018:89 54 81 O8mov111c:5dроp121d:c3retFigure 3.45 Disassembled code for Problem 3.66.The declarations of the compile-time constant CNT and the structure a_structare in a file for which you do not have the necessary access privilege. Fortunately,you have a copy of the .o' version of code, which you are able to disassemble withthe OBJDUMP program, yielding the disassembly shown in Figure 3.45.Using your reverse engineering skills, deduce the following.A. The value of CNT.B. A complete declaration of structure a_struct. Assume that the only fieldsin this structure are idx and x.II

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1 00000000 : %ebp %esp,%ebp Ox8(%ebp),%eax Oxc(%ebp),%ecx (%eax,%eax,4),%eax Ox4 (%ecx,%eax,4),%eax Oxb8 (%ecx),%edx (%ecx),%edx %edx,0x8(%ecx,%eax,4) %ebp 0: 55 push 3 1: 89 e5 mov 4 3: 8b 45 08 mov 5 6: 8b 4d Oc mov 6 9: 8d 04 80 lea 7 C: 03 44 81 04 add 8 10: 8b 91 b8 0o 00 00 mov 16: 03 11 add 10 18: 89 54 81 08 mov 11 1с: 5d pop 12 1d: c3 ret Figure 3.45 Disassembled code for Problem 3.66. The declarations of the compile-time constant CNT and the structure a_struct are in a file for which you do not have the necessary access privilege. Fortunately, you have a copy of the .o' version of code, which you are able to disassemble with the OBJDUMP program, yielding the disassembly shown in Figure 3.45. Using your reverse engineering skills, deduce the following. A. The value of CNT. B. A complete declaration of structure a_struct. Assume that the only fields in this structure are idx and x. 2.

1 00000000 : %ebp %esp,%ebp Ox8(%ebp),%eax Oxc(%ebp),%ecx (%eax,%eax,4),%eax Ox4 (%ecx,%eax,4),%eax Oxb8 (%ecx),%edx (%ecx),%edx %edx,0x8(%ecx,%eax,4) %ebp 0: 55 push 3 1: 89 e5 mov 4 3: 8b 45 08 mov 5 6: 8b 4d Oc mov 6 9: 8d 04 80 lea 7 C: 03 44 81 04 add 8 10: 8b 91 b8 0o 00 00 mov 16: 03 11 add 10 18: 89 54 81 08 mov 11 1с: 5d pop 12 1d: c3 ret Figure 3.45 Disassembled code for Problem 3.66. The declarations of the compile-time constant CNT and the structure a_struct are in a file for which you do not have the necessary access privilege. Fortunately, you have a copy of the .o' version of code, which you are able to disassemble with the OBJDUMP program, yielding the disassembly shown in Figure 3.45. Using your reverse engineering skills, deduce the following. A. The value of CNT. B. A complete declaration of structure a_struct. Assume that the only fields in this structure are idx and x. 2.

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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