pubg esp

This article will analyze the running process of C program on IA-32 system pc through compiler generated assembly code.Experimental environment: GCC 4.8.2Memory structure of C language programC code is as followsint g(int x){ return x + 1;}int f(int x){ return g(x);}int main(void){ return f(2) + 3;}Compile gcc -S -O0 -o main.s main.c -m32 The assembly file using the Compile command, as followsg: pushl %ebp movl %esp, %ebp movl

What is the code after this code Disassembly? # Include Long test (int a, int B){A = a + 3;B = B + 5;Return a + B;} Int main (int argc, char * argv []){Printf ("% d", test (10, 90 ));Return 0;} Let's look at an overview. 16: int main (int argc, char * argv [])17 :{00401070 push ebp00401071 mov ebp, esp00401073 sub esp, 40 h00401076 push ebx00401077 push esi00401078 push edi00401079 lea edi, [ebp-40h]00401_c mov ecx, 10 h00401081 mov eax, 0 CCCCCCCCh0

WusiDeep understanding of the function call stackA stack is a space that the C language program must run with a record call path and parametersThe role of the stack Function call Framework Passing parameters Save return address Provides local variable space Stack-related registers ESP, stack pointer, pointing to the top of the stack EBP, base point pointer, to the bottom of the stack, used in C to record the curr

In the Win32 assembly, we often have to deal with the API, but also will often use their own API-like with the parameters of the subroutine, this article is about the subroutine call in the process of the concept and analysis of parameter transfer. Generally in a program, the passing of parameters is carried out through the stack, that is, the caller presses the parameters to be passed to the subroutine (or the callee), and the subroutine takes the corresponding value out of the stack and uses i

When one function calls another function, you must first prepare the parameters of the called function. Then, the call command is executed to complete two tasks: 1. The next instruction of the called function is loaded into the stack. After the called function is returned, the instruction is taken to continue execution. 2. Modify the eip value of the instruction pointer register to point to the execution position of the called function. To call a function, you must first create a new stack fram

In Windows 7x86, the implementation of the kernel module NT (that is, the ntkrpamp module: Offset machine code command nt! Memset: 83c8ce40 8b54240c mov edX, dword ptr [esp + 0ch] 83c8ce44 8b4c2404 mov ECx, dword ptr [esp + 4] 83c8ce48 85d2 test edX, edx83c8ce4a 744f je nt! Memset + 0x5b (83c8ce9b) 83c8ce4c 33c0 XOR eax, eax83c8ce4e 8a442408 mov Al, byte PTR [esp

the program73d311ab 817e 38 6a030000 cmp dword ptr ds: [ESI + 38], 36a73d311b2 74 1A je short mfc42.73d311ce73D311B4 8B06 mov eax, dword ptr ds: [ESI]73D311B6 57 PUSH EDI73D311B7 8BCE mov ecx, ESI73D311B9 FF50 60 call dword ptr ds: [EAX + 60]; PreTranslateMessage (Message preprocessing)73D311BC 85C0 test eax, EAX73D311BE 75 0E jnz short MFC42.73D311CE73D311C0 57 push edi; message preprocessing returns FALSE73D311C1 FF15 ACB6DC73 call dword ptr ds: [73D311C7 57 PUSH EDI73d311c8 ff15 30b6dc73 cal

task */Structthread {unsignedlongip;// the EIP used to save the process unsignedlongsp;// The user save process esp};ID number of the typedefstructpcb{intpid;//processVolatilelongstate; /* Status of Process:-1 unrunnable, 0 runnable, >0 stopped * /the stack of charstack[kernel_stack_size];//processes has only one core stack. /* cpu-specific State of this task * /Structthread thread;// Only one thread per process. The starting entry address of the uns

1. Call and return of C functionsTo understand the implementation of the C + + exception mechanism, first understand the call and return mechanism of a function, which involves the ESP and EBP registers. Let's take a look at the function call and the return process.The following is the call convention __stdcall calling function test (intP1,intp2) Assembly code assumes that the function is executed before the stack pointer

): Access violation - code c0000005 (!!! second chance !!!)*** ERROR: Symbol file could not be found. Defaulted to export symbols for F:\Program Files (x86)\Amazon\Kindle\Kindle.exe - eax=000000dd ebx=000004e4 ecx=00000000 edx=0022ed44 esi=0022ed68 edi=000000ddeip=0197383f esp=0022ed14 ebp=05920448 iopl=0 nv up ei pl nz na po nccs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210202Kindle!std::_Init_locks::operator=+0x13

process the preprocessing part of the source program. After the processing is completed, the system will automatically compile the source program. 2.2 compile The compilation result is the compilation code. gcc -S Example.c -o Example.s The. s file is generated as follows: . File "example. C ". text. globlg. typeg, @ functiong :. lfb0 :. cfi_startprocpushl % EBP; EBP register content pressure stack. cfi_def_cfa_offset 8. cfi_offset 5,-8 movl % ESP,

;int *p;var1 = Arg1;var2 = Arg2;var3 = Arg3;p = (int *) arg4;*p = M_var1;return 0;}There are also portals and global functions:Main.cpp #include The following is a look at the call procedure under Debug, note that if VS.NET,VC is compiled, a DWORD is added before and after each variable to detect a buffer overflowThe first is to call the void function with no return value, which is __cdecl called by default:: fnvoid (1, 2, 3); 0040135D push 30040135F push 200401361 push

instruction ' jnz. L003nohalt ' X86cpuid-elf.s:97:error:bad instruction ' PUSHFL ' X86cpuid-elf.s:98:error:bad instruction ' popl%eax ' X86cpuid-elf.s:99:error:bad instruction ' BTL $9,%eax ' X86cpuid-elf.s:100:error:bad instruction ' Jnc. L003nohalt ' X86cpuid-elf.s:102:error:bad instruction ' PUSHL%edx ' X86cpuid-elf.s:103:error:bad instruction ' PUSHL%eax ' X86cpuid-elf.s:104:error:bad instruction ' hlt ' X86cpuid-elf.s:106:error:bad instruction ' Subl (%

There has always been a vague concept, so we use an example to strengthen memory. Linux x86 gcc3.2.3 att format Compilation The Code is as follows: Void Fun () { Int A = 'a '; } Void Main () { Int B; Fun (); Return; } Start debugging [Sanool @ sanool ex2] $ gdb a. Out Gnu gdb Red Hat Linux (6.0post-0.20031117.6rh) Copyright 2003 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are Welcome to change it and/or distribute copies of it un

Obtain the dialog box data and determine the length: 004011b5 |. 6a 14 push 0x14;/COUNT = 14 (20 .) 004011b7 |. 51 push ECx; | buffer = 0018f8b8004011b8 |. 66: 894424 2D mov word PTR [esp + 0x2d], ax; | 004011bd |. 68 e8030000 push 0x3e8; | controlid = 3e8 (1000 .) 004011c2 |. 52 push edX; | hwnd004011c3 |. c64424 20 00 mov byte PTR [esp + 0x20], 0x0; | 004011c8 |. 884424 37 mov byte PTR [

Monensin "Linux kernel Analysis" first week experimentZou LeOriginal works reproduced please indicate the source.Course Information:"Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000---------------------------the body of the experiment---------------------------This experiment is carried out under the 64-bit liinux virtual machine in the experimental building.The C code is as follows:int increment5 (int x) { return5;} int Solve (int x) { return2;} int Main (

represents the current EIP execution position) 1. At the beginning, the EIP points to 19 lines, EBP ESP is in 0 position (01234 on the right is set for convenient analysis) 2.PUSHL%ebp, the EBP value stack 3.movl%esp,%ebp, Assign ESP value to EBP 4.subl $4,%esp, move esp