Reverse Engineering for Beginners

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS for (y=0; y<4; y++) a[x][y]=0; // fill second row by 0..3: for (y=0; y<4; y++) a[1][ ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS }; char get_by_coordinates2 (char array, int a, int b) { // treat input array as one-dimen ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS GCC also generates equivalent routines, but slightly different: Listing 18.23: Optimizing ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS _y$ = 12 ; size = 4 _z$ = 16 ; size = 4 _value$ = 20 ; size = 4 _insert PROC push ebp mov ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS ; allocate place in local stack for 4 values of int type SUB SP, SP, #0x10 MOV R9, 0xFC2 ; ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS ; $a3=value sll $v0, $a0, 5 ; $v0 = $a0<<5 = x32 sll $a0, 3 ; $a0 = $a0<<3 = x ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS { return &month2[month][0]; }; Here is what we’ve get: Listing 18.30: Optimizing MSVC ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS pop rbp ret Non-optimizing MSVC just usesIMULinstruction: Listing 18.33: Non-optimizing MS ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS Listing 18.36: Optimizing GCC 4.9 ARM64 ; W0 = month sxtw x0, w0 ; X0 = sign-extended inpu ...

CHAPTER 18. ARRAYS CHAPTER 18. ARRAYS 18.8 Conclusion. An array is a pack of values in memory located adjacently. It’s true for ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) Chapter 19 Manipulating specific bit(s) A lot ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) Here we see theTESTinstruction, however it doe ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) The Linux 2.6 kernel is compiled with-mregparm ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) } static int do_last(struct nameidata nd, stru ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) define REMOVE_BIT(var, bit) ((var) &= ~(bi ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) OllyDbg Let’s try this example in OllyDbg. Fir ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) ORgot executed: Figure 19.2:OllyDbg:ORexecuted ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) The value is reloaded again (because the compi ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) ANDgot executed: Figure 19.4:OllyDbg:ANDexecut ...

CHAPTER 19. MANIPULATING SPECIFIC BIT(S) CHAPTER 19. MANIPULATING SPECIFIC BIT(S) Optimizing GCC Listing 19.13: Optimizing GCC p ...