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microsecondsFmt6 dB/'================================================ =========== ', 0dh, 0ah ,/'Simple ASM Program to compute PI with invalid digits. ', 0dh, 0ah ,/'Pi/4 = 12 * arctan (1/18) + 8 * arctan (1/57)-5 * arctan (1/239) (Gauss )',/0dh, 0ah, 'by G-spider @ 2010', 0dh, 0ah ,/'Computation of 10000 digits of PI ', 0dh, 0ah ,/'Total computation time :',/'% 6lld Ms', 0dh, 0ah ,/'================================================ ============ ', 0dh, 0ah, 0 . Data?X dd?Y dd?_ Sizechar dd?Lppi

layout is skipped. Next let's take a look at the virtual function calling Pt-> Foo (); Through the pointer. The resulting assembly code is as follows:01 004230f6 mov eax, dword ptr [EBP + fffff900h]02 004230fc mov edX, dword ptr [eax]03 004230fe mov ESI, ESP04 00423100 mov ECx, dword ptr [EBP + fffff900h]05 00423106 call dword ptr [edX]In row 1st, the address directed by PT is moved into the eax register,

the siteCall makefs4gbsegment; the returned FS segment can be 4 GB memory. EBX =.############# Map the code to a linear address of 80000000 H + CS * 4, avoid NTS not mapped to memory reserved by our code ############MoV eax, FS: [EBX + 800 H]; eax = Linear address up to 10 bits 400 h * 4 = 800 H, determine the location of the page Directory table pointed to in S3.And eax, 0fffff000h; remove the obtained Level 2 page table attribute bit. eax = 80000000h linear address Level 2 page table physical

check_03 sub eax, ebx jmp this_exitcheck_03: CMP Cl, '*' jnz check_04 imul ebx jmp limit: CMP Cl, '/'jnz err XOR edX, EDX idiv ebx jmp this_exiterr: XOR eax, eax this_exit: retcalc endp; var_mode: input parameter,; mode = 1, expression analysis completed, 0: there are currently four Arithmetic Operators; Return Value: none; this procedure work on global array num_arr, op_arr, num_count, op_countdo_calc Pro

Tags: Assembly atampt Addition: . Section. DataVAL: . Quad 3481219651 Val1: . Quad 6678934517 Output: . Asciz "the RES is % QD \ n" . Section. Text. Globl _ start _ Start: Movl Val, % eax Movl Val + 4, % EBX Movl val1, % ECx Movl val1 + 4, % edX Addl % eax, % ECx Adcl % EBX, % edX Pushl %

2eac4 2e9c |. 85c test eax, eax // The registration code is converted to hexadecimal 4b235264 2e9e |. 7c 12 JL short China Communications. 4 2eb24 2ea |> 59 pop ECx // false code 787878784 2ea1 |. 31f6 xor esi, ESI // ESI = 1 2fc59 = 169728894 2ea3 | gt; 8932 mov dword ptr ds: [edX], ESI4 2ea5 |. 5f pop EDI4 2ea6 |. 5E pop ESI4 2ea7 |. 5B pop EBX // EBX = 787878784 2ea8 |. C3 retn 4 A |. 8bf mov ESI, eax // ESI = A eax = 4b235264 A A2 |. 833c24 cmp

. Text: 000387c9 call kegetcurrentirql. Text: 000387c9. Text: 000387ce and eax, 0ffh. Text: 000387d3 test eax, eax. Text: 000387d5 jnz short loc_387ef. Text: 000387d5. Text: 000387d7 call sub_37b5f. Text: 000387d7. Text: 000387dc test eax, eax. Text: 000387de JZ short loc_387ef. Text: 000387de. Text: 000387e0 mov dword_4b258, 0. Text: 000387ea call sub_37b9a. Text: 000387ea. Text: 000387ef. Text: 000387ef loc_387ef:; Code xref: sub_38736 + 91 \ u0018j. Text: 000387ef; sub_38736 + 9f \ u0018j. Te

check whether your input is correct". I think those characters may be nearby, so double-click "registration failed, check whether your input is correct. 00415829 |> 66: C745 A4 D4> mov word ptr ss: [EBP-5C], 0D40036682f |. BA ADEC4900 mov edx, TextDraw.0049ECAD; Registration failed. Please check whether your input is correct00415834 |. 8D45 B8 lea eax, dword ptr ss: [EBP-48] In section 00415829, the "jump from 0000004ed" is displayed in the informat

efficiency, should be converted to assembly, the intermediate results into a separate register40.//Thanks to Menzi11 's article, let me realize that the relevant data in the program will make the CPU can not disorderly execution.41.//Here is replaced by pseudo assemblerTYPE S4 = 0;43.Register TYPE r1 = 0;Register TYPE r2 = 0;for (int i = 0; i R1 + + + a[i++];R2 + = a[i++];49.}50.Wuyi Cout52.} Several of the above versions are reasonable, but these optimizations are based on the assumption that

add eax,0x8; Pptr+2 003cc57c; In C language, the operation of pointers is 003cc57c based on pointer type; An int pointer plus 1 means that the address it points to is moved backward in length to a 003cc57c; The distance of the int size, which is 4 bytes. If it's a word type, move backwards by 2 bytes. 003cc57f Push eax003cc580 mov ecx,[local.7]003cc583 add ecx,0x4; Pptr+1 003cc586 push ecx003cc587 mov edx,[local.7]003cc58a push

(MOV) (An immediate number is actually a constant integer.) different operand type combinations supported by the data transfer Directive What is inside the parentheses represents the memory address. (For example,%eax, which represents a memory address.) Simple addressing mode If we have an operand that accesses memory, then how is the memory address calculated or referred to as how it is addressed. (-Indirect addressing Take Movl (%ECX),%eax as an example: The register ECX inside the value a

The test software is Splish.exe.Bytes ------------------------------------------------------------------------------------------I am sure everyone knows the beginning of searching for an algorithm. I will not talk about it here. Next I will directly discuss the assembly code and comments of the algorithm.Bytes ------------------------------------------------------------------------------------------------004015E4 55 push ebp; algorithm started004015E5 8BEC mov ebp, ESP004015E7 6A 20 PUSH 2000401

dummy1, int dummy2){_ ASM {Push EBPMoV EBP, ESPMoV eax, 152Lea edX, 8 [EBP]Int 0x2ePop EBPRET 9}} It turns out that the user space also has an ntreadfile (), which is executing the self-trapping command "int 0x2e ". Let's take a look at this Assembly Code. Here, 152 is the call number of the System Call ntreadfile (), so when the CPU falls into the system space, the register eax holds the specific system call number. The register

connect them during compilation?In this case, we can conclude that there is another secret. For more information, see ntreadfile () in msvc6/iface/native/syscall/debug/ZW. C: _ Declspec (naked) _ stdcallNtreadfile (INT dummy0, int dummy1, int dummy2){_ ASM {Push EBPMoV EBP, ESPMoV eax, 152Lea edX, 8 [EBP]Int 0x2ePop EBPRET 9}} It turns out that the user space also has an ntreadfile (), which is executing the self-trapping command "int 0x2e ". Let's t

In many network development scenarios, memory conversion is often encountered in the following scenarios: #define PACKAGE_PARSE_ERROR -1#define PACKAGE_PARSE_OK 0int parse_package( int* a, int* b, int* c, int* d, char* buf, int buf_len ){ if( !buf || buf_len This is a call in the Process of network unpacking, and the packet process is a reverse process. An application like this can be replaced by an integer forced conversion, and the efficiency will be at least doubled. To illustrate t

Reading Tips: 《Delphi Image ProcessingThe series focuses on efficiency. The general code is Pascal, and the core code is BaSm. 《C ++ Image ProcessingThe series focuses on code clarity and readability, and all uses C ++ code. Make sure that the two items are consistent and can be compared with each other. The code in this article must include the imagedata. Pas unit in "Delphi Image Processing-data type and public process. The minimum value processing of an image is centered on the current pixel

de facto standard? In other words, thefuck is not very tall. _ (: 3 "outputs) _ list of excellent Python projects (awesome-python) Vinta/awesome-python · GitHub Pycrumbs/pycrumbs. md at master · kirang89/pycrumbs · GitHub Svaksha/pythonidae · GitHub Checkcheckzz/python-github-projects · GitHub Rasbt/python_reference · GitHub Easy-Python And awesome-* Series Bayandin/awesome-awesomeness · GitHub Sqlmap! Goagent! By the way, there are also shadowsocks! Open

Tools:VC 7.0BCB 6.0Compilation options: Maximum Speed Optimization (VC 7.0 turns off the automatic inline function option)Decompilation tool: w32dasm Benchmark Test procedure:Void test (){Int A = 0, B = 1, C = 4;For (INT I = 0; I ++;}} Int main (){_ ASM {MoV edX, EDXNOP};Test ();} Purpose: To test the program's ability to optimize useless functions. Because test does not return any value or modify any external variables,Therefore, for programs, this i

: 77F061F8 _ NtQuerySystemInformation @ 16 In ntdll, the two functions of zw and nt are actually the same subject: . Text: 77F061F8 mov eax, 105 h; NtQuerySystemInformation . Text: 77F061F8; RtlGetNativeSystemInformation . Text: 77F061FD mov edx, 7FFE0300h . Text: 77F06202 call dword ptr [edx] . Text: 77F06204 retn 10 h Then compare the image: Check whether the Mode is usermode or kernelmode. Ntdll. the

Core tips: This experiment demonstrates that when calling a method in a class, all methods imply a self parameter, and this parameter is passed as the first parameter of the object method... First, create an empty form and put a button.The following two methods are declared under implementation: // The external method declares only one parameter. In this case, the standard Object internal event Method tpolicyevent is declared. In this declaration, the sender corresponds to the object pointer