Does JavaScript stop executing script when a Web Assembly function is called?

I am fairly inexperienced with web development and want to put a lot of time into learning JavaScript and Web Assembly because they both seem like extremely powerful tools when used together. When structuring my projects should I assume that the V8 engine will just stop executing code when I run a wasm function from JS, or will they run simultaneously?

Alguém para dar uma força na em Assembly? [pendente]

Atenção, todos os exercicios precisam que seja inserido no inicio valores constantes para testes. Ainda não estamos entrando com valores pelo teclado.

Todos os números que utilizaremos nestas atividades serão no máximo até 255. ou seja, trabalharemos com apenas 1 registrador por número.

Atividade 1: Somar dois números e salvar em um registrador diferente.

Atividade 2: Ordenar dois números (Os números ordenados deverão ficar no registrador R20 e R21)

Atividade 3: Somar dois números, caso a soma dê mais de 30, subtrair 10, caso contrário, adicionar o valor atual da soma (isso equivale a multiplicar a soma atual por 2). Salvar o resultado no R20.

Atividade 4: Ordenar três números em ordem crescente, Salvar ordenado nos registradores R20, R21 e R22.

Atividade 5: Multiplicar um número por 5 e salvar o valor no registrador R20. Coloque um valor pequeno na entrada, máximo 15 para evitar overflow. Não vale utilizar nesta atividade a instrução de multiplicação. E você deverá utilizar um loop de repetição.

Atividade 6: Carregue valores na memória, começando do endereço $ 100 os valores de 1 a 10. Utilize o comando de repetição para isso.

Atividade 7: Some os valores de $ 100 a $ 10A e coloque em R20. Lembre-se trabalhe com valores pequenos para evitar overflow. Inicie com alguns valores os endereços indicados antes de executar o código.

Atividade 8: Some 8 valores da memória e tire a média (dica, divisão por potência de 2 é só deslocar os bits para a direita)

Atividade 9: Carregue valores na memória, começando do endereço $ 100 os valores de 10 a 20. Depois subtraia de 3 cada endereço de memória

Atividade 10: Carregue 10 valores , começando em $ 100 e ordene estes valores de forma crescente

The application on react + redux + react-dnd does not work after assembly, why?

when running the test script an error occurs

Invariant Violation: Could not find “store” in the context of “Connect (DragD ropContext (App)) “. Either wrap the root component in a, or pass a custom React context provider to and the corresponding React context Consumer Connect (DragDropContext (App)) in connect options.

although everything works in an unassembled project. As I understand it, there are some problems due to the fact that the root component is wrapped in two hocs – one redox, the other dnd.

ReactDOM.render(<DragDropContextProvider backend={HTML5Backend}>                     <Provider store={store}>                         <App />                     </Provider>                 </DragDropContextProvider>, document.getElementById('root')); 

I tried to wrap first in dnd, then in redaks – it did not help, everything is the same.

ASP.Net Core 3, add Identity from external assembly. Failed reference

I am trying to add Identity service from external assembly.

When I do:

using System;     using Microsoft.AspNetCore.Hosting;     using Microsoft.AspNetCore.Identity;     using Microsoft.EntityFrameworkCore;     using Assemblies.IHostingStartupAssembly.IdentityStartup.Data;      [assembly: HostingStartup(typeof(Assemblies.IHostingStartupAssembly.IdentityStartup.IdentityStartupAssembly))]     namespace Assemblies.IHostingStartupAssembly.IdentityStartup     {         public class IdentityStartupAssembly : IHostingStartup         {             public void Configure(IWebHostBuilder builder)             {                 builder.ConfigureServices((services) =>                 {                     services.AddDbContext<ApplicationDbContext>(options =>                    options.UseSqlServer(                        Configuration.GetConnectionString("DefaultConnection")));                     services.AddDefaultIdentity<IdentityUser>()                         .AddEntityFrameworkStores<ApplicationDbContext>();                 });             }            }     } 

I found that

IServiceCollection” does not contain a definition for “AddDbContext” or an accessible extension method “AddDbContext” that accepts a first argument of type “IServiceCollection” (missing any using directive or an assembly reference?)

and the same for AddDefaultIdentity

It is a sample scenario. But why it miss the reference? Here package references:

<ItemGroup>             <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.0.0-preview6.19307.2" /> <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.0.0-preview6.19304.10" />             <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.0.0-preview6.19304.10" />             <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.0.0-preview6.19304.6" />         </ItemGroup>     <ItemGroup>         <Reference Include="Microsoft.AspNetCore.Hosting.Abstractions">           <HintPath>[LONGLOCALROUTE]\netcoreapp3.0\Microsoft.AspNetCore.Hosting.Abstractions.dll         </HintPath>         </Reference>        </ItemGroup> 

Thanks in advance.

ARM Assembly and Shellcode (using recv)

I am starting to learn about ARM assembly from and I want to practise receiving data from a socket. This is a code snippet of what I have written so far. The testing is done on a mobile device.

Network client code

    @socket syscall     movw r7,#281     mov r0,#2     mov r1,#1     sub r2,r2,r2     svc #1     mov r6,r0      @connect syscall     movw r7,#283     adr r1,struct     strb r2,[r1,#1]     mov r2,#16     mov r0,r6     svc #1      @recv syscall     mov r0,r6     mov r3, #100     adr r1,to_receive     mov r2,#receive_size     svc #1      @write syscall     mov r7,#4     mov r0,#1     adr r1,to_receive     mov r2,#receive_size     svc #1      @exit with error code from last syscall     mov r7,#1     svc #1      struct:     .ascii "\x02\xff" @AF_INET     .ascii "\x11\x5c" @port 4444     .byte 127,0,0,1   @ip      to_receive: .skip 40     after_to_receive:     .set receive_size, after_to_receive - to_receive 

At the other end of the network connection, I configured nc to listen and pipe some text data to a successful connection.

Network listener (server)

toybox nc -Lp 4444 < file_to_send.txt 

However, I am not seeing any output to the client’s console screen. I suspect that either the recv syscall is not receiving the data or that the write syscall is not working as I intended.

I don’t see any error messages so I am not sure if I am doing it right. Any advice is appreciated.

Segmentation fault (core dumped) when trying to call assembly functions from C

after running this program i got a bug ‘Segmentation fault (core dumped)’ im using Ubuntu 14.04 can someone tell me what kind of error this is and how to solve it? here is the code:

#include<stdlib.h> #include<stdio.h>  typedef struct {   char hex[17];   char dezimal[21]; }Stu;  extern Stu* _structfunc(int n); int main(int argc, char *argv[]) {         Stu* a = _structfunc(123456);         printf("%s,%s",a->hex,a->dezimal);         free (a);         return 0; }   
LEN_HEX equ 16 LEN_DEZ equ 10 LEN_STRUCT equ LEN_HEX + 1 + LEN_DEZ + 1 SECTION .data base10 dq 10 base16 dq 16 SECTION .text global _structfunc extern malloc extern free _structfunc:         push rbp         mov rbp,rsp         push rbx ;save the previous value in rdi          push rdi ;s.o.         mov rdi,LEN_STRUCT         call malloc ;adress in rax         mov rbx,rax         mov rax,[rsp]         mov rcx,LEN_HEX hex:         mov rdx,0         div qword [base16]         cmp rdx,10         jae hex_charactor         add rdx,0x30         jmp hex_end hex_charactor:         add rdx,0x37 hex_end:         mov [rbx+rcx-1],dl         loop hex         mov byte [rbx+LEN_HEX],0         mov rax,[rsp]         mov rcx, LEN_DEZ dez:         mov rdx,0         div qword [base10]         add rdx,0x30 dez_end:         mov [rbx+LEN_HEX+1+rcx-1],dl         loop dez         mov byte [rbx+LEN_STRUCT-1],0         add rsp,8         pop rbx         pop rbp         ret     

Print out an number without knowing its length firstly in LC-3 Assembly language

enter image description here

The picture above is my homework. I just don’t know how to solve the problem when printing out a number when it contains a vary of numbers which can lead to 5,6 or 7 characters per number. I think we must have a general solution for that case, if there’re only 2 characters then I can do it, but when I has a random number, I can’t do it. Here is my uncompleted answer. The blank line between AND R0,R0,#0 and OUT is that’s where I stuck

       .ORIG x3100        LD R1,ASCII        LD R2,BEGIN        AND R5,R5,#0        LDR R5,R2,#0        NOT R5,R5        ADD R5,R5,#1        AND R3,R3,#0        ADD R3,R3,#15        ADD R3,R3,#7 LOOP   ADD R3,R3,#-1        BRz DONE        ADD R2,R2,#1        LDR R6,R2,#0        ADD R4,R6,R5        BRn LOOP        ADD R5,R6,#0        NOT R5,R5        ADD R5,R5,#1        BRnzp LOOP DONE   LEA R0, P_OUT        PUTS        AND R0,R0,#0         OUT        HALT ASCII  .FILL x30 BEGIN  .FILL x3150 P_OUT  .STRINGZ "THE MAXIMUM IS: "        .END ``` 

How is an Assembly Language Processed by a CPU’s Circuitry?

I’d like to have a bit more understanding of how, on a circuitry/hardware level, an assembler program works.

I think I have a very broad-brush understanding of how a CPU would process machine code on a hardware level. Please bear with me for this very generalised, hypothetical example:

If you took 00101110 in machine code, with the first part 0010 as an opcode and the second part 1110 as location address…

I think I understand, broadly, how those 8 bits of data would be fed along 8 wires to an instruction register, and how from there, the opcode 0010 gets fed along 4 wires into a variety of checking circuits to check the opcode, and a checking circuit would output true if if the opcode corresponded to the configuration of that circuit. Like this (yes I’ve been watching crash course computer science):

enter image description here

And i think I understand how, in broad terms, the location address 0111 would be sent along 4 wires that feed into multiplexors attached to four latch matrices, causing address location 0111 to be accessed in each of those matrices, each of which then feeds back whether its data bit at the location was a 1 or 0 / on or off.

What I’m saying is that I think I can begin to see, or at least imagine, how a processor ‘processes’ a binary number, on the level of hardware/circuitry, without it seeming like magic.

My question is, can someone explain to me on this level how a CPU, as part of an assembler, would translate assembly code?

For example, how would the circuitry take MOV EAX [EBX] and act on that as an instruction? I know that it would parse it, etc., but HOW does it parse it, on the level of wiring? Like how does it take a ‘MOV’ and translate that into the correct configuration of on/off wires?

On a related note, obviously the ‘MOV’ isn’t stored as ‘MOV’ in the computer’s memory – it’s stored in binary. So if it’s already stored in binary, why do we need to bother to translate it to a different binary configuration using an assembler?

This is a plain swap of 64-bit integers on 64-bit ARM, using inline assembly in gcc, but it needs to be in clang

I’d like to get an opinion for this, which I found in BDE and modified.

I need the fastest 64-bit integer swap possible. This is for a mobile application used by a lot of people, so I want to create a template specialization for this (in addition to std::swap() ) and integrate it into the C++ std library for our platform.

I’m not sure about how to port this to clang 7. It builds fine with gcc. Any advice would be appreciated..

inline int64_t swapInt64(int64_t *atomicInt,               int64_t swapValue) {     int64_t oldValue;     int rc;      // Clang doesn't support register     // pairs that represent a 64bit value.  So instead of 'ldrexd %1, %H1, [%3]'     // the exact registers have to be specified, as in 'ldrexd r2, r3, [%3]'.      asm volatile (         "1:     ldrexd  r2, r3, [%4]           \n\t"         "       mov     %[old1], r2            \n\t"         "       mov     %[old2], r3            \n\t"         "       mov     r2, %[val1]            \n\t"         "       mov     r3, %[val2]            \n\t"         "       strexd  %[rc], r2, r3, [%4]    \n\t"                 : [rc]   "=&r" (rc),                   [old1] "=&r" (((Int64_Words &) oldValue).w1),                   [old2] "=&r" (((Int64_Words &) oldValue).w2),                          "+Qo" (*atomicInt)                 :        "r"   (atomicInt),                   [val1] "r"   (((Int64_Words &) swapValue).w1),                   [val2] "r"   (((Int64_Words &) swapValue).w2)                 : "r2", "r3", "cc", "memory");      return oldValue; }  

Como posso printar uma string digitada pelo usuário em Assembly 8086?

Estou com dificuldades para conseguir printar uma string que foi posteriormente digitada pelo usuário através do INT 21h/AH 0Ah. Não tenho ideia de como posso fazer para printar a string que foi arquivada em AL.

mov ah, 0Ah int 21h 

Já tentei utilizar o INT 21h/AH 09h, porém acho que não soube utilizar de maneira correta.