Answered: Command line arguments are passed to…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Command line arguments are passed to int main(int argc, char** argv) as arguments argc and argv. You should assume that argc is at ebp+8 and argv is at ebp+12.

00000000 <what>:
0: push %ebp
1: mov %esp,%ebp
3: sub $0x10,%esp
6: mov 0x8(%ebp),%eax
9: add $0x4,%eax
c: mov %eax,-0x4(%ebp)
f: mov 0x8(%ebp),%eax
12: imul 0xc(%ebp),%eax
16: mov %eax,-0x8(%ebp)
19: mov 0x8(%ebp),%eax
1c: sub 0xc(%ebp),%eax
1f: mov %eax,-0xc(%ebp)
22: mov -0x4(%ebp),%edx
25: mov -0x8(%ebp),%eax
28: add %eax,%edx
2a: mov -0xc(%ebp),%eax
2d: add %edx,%eax
2f: leave
30: ret
00000031 <main>:
31: lea 0x4(%esp),%ecx
35: and $0xfffffff0,%esp
38: pushl -0x4(%ecx)
3b: push %ebp
3c: mov %esp,%ebp
3e: push %ebx
3f: push %ecx
40: sub $0x10,%esp
43: mov %ecx,%ebx
45: mov 0x4(%ebx),%eax
48: add $0x4,%eax
4b: mov (%eax),%eax
4d: sub $0xc,%esp
50: push %eax
51: call 52 <main+0x21>
56: add $0x10,%esp
59: mov %eax,-0xc(%ebp)
5c: mov 0x4(%ebx),%eax
5f: add $0x8,%eax
62: mov (%eax),%eax
64: sub $0xc,%esp
67: push %eax
68: call 69 <main+0x38>
6d: add $0x10,%esp
70: mov %eax,-0x10(%ebp)
73: mov -0x10(%ebp),%eax
76: lea 0x1(%eax),%edx
79: mov -0xc(%ebp),%eax
7c: add $0x2,%eax
7f: sub $0x8,%esp
82: push %edx
83: push %eax
84: call 85 <main+0x54>
89: add $0x10,%esp
8c: mov %eax,-0x14(%ebp)
8f: sub $0x8,%esp
92: pushl -0x14(%ebp)
95: push $0x0
9a: call 9b <main+0x6a>
9f: add $0x10,%esp
a2: mov $0x0,%eax
a7: lea -0x8(%ebp),%esp
aa: pop %ecx
ab: pop %ebx
ac: pop %ebp
ad: lea -0x4(%ecx),%esp
b0: ret

This program is invoked from the command line as shown:

./program 5 7

The procedure named what is called from main, and returns to main with the value:

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