Reverse Engineering for Beginners
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES This is an example where the branch delay slots can confuse us. For example, there ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES add eax, 1900 mov [esp+30h+var_2C], eax mov [esp+30h+var_30], offset aYearD ; "Yea ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES We justcasta pointer to structure to an array ofint’s. And that works! We run the ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES include <stdio.h> include <time.h> void main() { struct tm t; time_t u ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES ; print carriage return character (CR) mov dword ptr [esp], 0Ah ; c add esi, 4 cal ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES 13 mov DWORD PTR [eax], ecx 14 mov edx, DWORD PTR _tmp$[ebp+4] 15 mov DWORD PTR [e ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES 22 ret 0 23 _main ENDP 24 25 _TEXT SEGMENT 26 _s$ = 8 ; size = 10 27 ?f@@YAXUs@@@Z ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES OllyDbg + fields are packed by default Let’s try our example (where the fields are ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES OllyDbg + fields aligning on 1 byte boundary Things are much clearer here: 4 field ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES ARM + Optimizing Xcode 4.6.3 (LLVM) (Thumb-2 mode) Listing 21.22: Optimizing Xcode ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES 42 $LC0: .ascii "a=%d; b=%d; c=%d; d=%d\n" Structure fields come in registers $A0. ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES _TEXT SEGMENT _s$ = 8 _f PROC mov eax, DWORD PTR _s$[esp+16] movsx ecx, BYTE PTR _ ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES 21.5.1 OllyDbg. Let’s load the example into OllyDbg and take a look atouter_struct ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES endif ifdef _MSC_VER include <intrin.h> endif struct CPUID_1_EAX { unsigned ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES mov eax, esi and eax, 15 push eax push OFFSET $SG15435 ; 'stepping=%d', 0aH, 00H c ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES MSVC + OllyDbg Let’s load our example into OllyDbg and see, what values are set in ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES mov esi, 1 push ebx mov eax, esi sub esp, 18h cpuid mov esi, eax and eax, 0Fh mov ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES include <assert.h> include <stdlib.h> include <memory.h> struct ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES mov ecx, DWORD PTR _t$[ebp] and ecx, -2139095041 ; 807fffffH - drop exponent ; add ...
CHAPTER 21. STRUCTURES CHAPTER 21. STRUCTURES Thef()function is almost understandable. However, what is interesting is that GCC ...
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