Explanation of the disassembly of the simplest program (x86)
- by noname
The following code
int _main() {return 0;}
Compiled using the command:
gcc -s -nostdlib -nostartfiles 01-simple.c -o01-simple.exe
gcc version 4.4.1 (TDM-1 mingw32)
OllyDbg produced this output:
http://imgur.com/g81vK.png
Can you explain what happens here?
Analysis so far:
// these two seems to be an idiom:
PUSH EBP // places EBP on stack
MOV EBP, ESP // overwrites EBP with ESP
MOV EAX, 0 // EAX = 0
LEAVE // == mov esp, ebp
// pop ebp
// according to
// http://en.wikipedia.org/wiki/X86_instruction_listings
What is the meaning of all this?
