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  • Assembly Programming and Interrupt Handling

    - by nmr
    I'm writing a program in assembly using MIPS architecture for a class, and I'm having trouble figuring out how to grab an input character by a user and store it in a register to process. The program would open a console, output a message, the user can then input a character and then this determines what is supposed to happen next in the program. Like I said, I'm having trouble figuring out how to grab the character so that I can act upon it in the program. thanks

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  • When should we put an Assembly into GAC?

    - by Amitabh
    I would like to know practically what kind of Assembly should we put in GAC. Case 1. If in my Solution multiple project uses log4net.dll then should it be part of GAC? Case 2. If I have multiple application deployed in a machine each using log4net.dll is this the reason enough to put log4net.dll into GAC?

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  • many "META-INF/ already added, skipping" warnings when building assembly

    - by Tchick
    Hi, when building a jar-with-dependencies with the assembly plugin, I get many, many messages like this: META-INF/ already added, skipping It seems to mee, that maven is warning me, that I already have a META-INF in my to-be-created jar, and therefore the META-INF of the to-be-included dependant jar file is not included in my to-be-created jar. Well, this is exactly what I want, and I want to ged rid of those messages. Is there a way to achieve this? Regards, Martin.

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  • Getting the Assembly Qualified Name of a class in Visual Studio

    - by Alex Marshall
    Hello, I'm writing a customized reflective library for some specialized custom domain logic, and that library is going to use XML configuration files that will dynamically resolve System.Type objects at runtime. However, when writing the XML configuration files, it's a bit of a pain to write the types because they need to be fully qualified assembly names for Type.GetType() to resolve them. Is there a way to find out the AssemblyQualifiedName of an object in Visual Studio without resorting to writing a program to print them out to a file or standard out or anything like that ?

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  • calling c function from assembly

    - by void
    I'm trying to use a function in assembly in a C project, the function is supposed to call a libc function let's say printf() but I keep getting a segmentation fault. In the .c file I have the declaration of the function let's say int do_shit_in_asm() In the .asm file I have .extern printf .section .data printtext: .ascii "test" .section .text .global do_shit_in_asm .type do_shit_in_asm, @function do_shit_in_asm: pushl %ebp movl %esp, %ebp push printtext call printf movl %ebp, %esp pop %ebp ret Any pointers would be appreciated. as func.asm -o func.o gcc prog.c func.o -o prog

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  • Change an array's value in x86 assembly (embedded in C++)

    - by VV
    I am messing around with assembly for the first time, and can't seem to change the index values of an array. Here's the method I am working on int ascending_sort( char arrayOfLetters[], int arraySize ) { char temp; __asm { //??? } } And these are what I tried mov temp, 'X' mov al, temp mov arrayOfLetters[0], al And this gave me an error C2415: improper operand type so I tried mov temp, 'X' mov al, temp mov BYTE PTR arrayOfLetters[0], al This complied, but it didn't change the array...

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  • Assembly GDB Print String

    - by Ken
    So in assembly I declare the following String: Sample db "This is a sample string",0 In GDB I type "p Sample" (without quotes) and it spits out 0x73696854. I want the actual String to print out. So I tried "printf "%s", Sample" (again, without quotes) and it spits out "Cannot access memory at address 0x73696854." Short version: How do I print a string in GDB?

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  • Easy way to convert c code to assembly?

    - by Bob
    Is there an easy way (like a free program) that can covert c/c++ code to x86 assembly? I know that any c compiler does something very similar and that I can just compile the c code and then disassemble the complied executable, but that's kind of an overkill, all I want is to convert a few lines of code. Does anyone know of some program that can do that?

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  • Messing with the stack in assembly and c++

    - by user246100
    I want to do the following: I have a function that is not mine (it really doesn't matter here but just to say that I don't have control over it) and that I want to patch so that it calls a function of mine, preserving the arguments list (jumping is not an option). What I'm trying to do is, to put the stack pointer as it was before that function is called and then call mine (like going back and do again the same thing but with a different function). This doesn't work straight because the stack becomes messed up. I believe that when I do the call it replaces the return address. So, I did a step to preserve the return address saving it in a globally variable and it works but this is not ok because I want it to resist to recursitivy and you know what I mean. Anyway, i'm a newbie in assembly so that's why I'm here. Please, don't tell me about already made software to do this because I want to make things my way. Of course, this code has to be compiler and optimization independent. My code (If it is bigger than what is acceptable please tell me how to post it): // A function that is not mine but to which I have access and want to patch so that it calls a function of mine with its original arguments void real(int a,int b,int c,int d) { } // A function that I want to be called, receiving the original arguments void receiver(int a,int b,int c,int d) { printf("Arguments %d %d %d %d\n",a,b,c,d); } long helper; // A patch to apply in the "real" function and on which I will call "receiver" with the same arguments that "real" received. __declspec( naked ) void patch() { _asm { // This first two instructions save the return address in a global variable // If I don't save and restore, the program won't work correctly. // I want to do this without having to use a global variable mov eax, [ebp+4] mov helper,eax push ebp mov ebp, esp // Make that the stack becomes as it were before the real function was called add esp, 8 // Calls our receiver call receiver mov esp, ebp pop ebp // Restores the return address previously saved mov eax, helper mov [ebp+4],eax ret } } int _tmain(int argc, _TCHAR* argv[]) { FlushInstructionCache(GetCurrentProcess(),&real,5); DWORD oldProtection; VirtualProtect(&real,5,PAGE_EXECUTE_READWRITE,&oldProtection); // Patching the real function to go to my patch ((unsigned char*)real)[0] = 0xE9; *((long*)((long)(real) + sizeof(unsigned char))) = (char*)patch - (char*)real - 5; // calling real function (I'm just calling it with inline assembly because otherwise it seems to works as if it were un patched // that is strange but irrelevant for this _asm { push 666 push 1337 push 69 push 100 call real add esp, 16 } return 0; }

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  • interpreting assembly instructions

    - by David Lee
    I am trying to translate the following: Action: pushl %ebp movl %esp, %eax subl $32, %esp movl $0, -8(%eax) movl $0, -4(%eax) movl -4(%eax), %eax cmpl 32(%eax), %ebp movl -4(%ebp), %eax sall $2, %ebp addl 8(%ebp), %ebp movl (%ebp), %ebp addl %ebp, -8(%eax) addl $1, -4(%eax) What is the best way to learn assembly and translating this code?

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  • Error: type or namespace name 'AssemblyKeyFileAttribute' and 'AssemblyKeyFile' could not be found

    To associate an assembly with a strong key file to store it to GAC, we use should include following line after all the imports and before defing namespace. For VB.NET:  <Assembly: AssemblyKeyFile("c:\path\mykey.snk")> For C#:    [assembly: AssemblyKeyFile(@"c:\path\mykey.snk")] but, you might encounter following two errors at the time of creating Assembly for GAC. 1. The type or namespace name 'AssemblyKeyFileAttribute' could not be found (are you missing a using directive or an assembly reference?) 2. The type or namespace name 'AssemblyKeyFile' could not be found (are you missing a using directive or an assembly reference?) How to resolve these errors: Just include "System.Reflection" namespace. It resolve above two errors. span.fullpost {display:none;}

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  • Beginner learning assembly preserving esp after function calls

    - by Daniel
    I'm a beginner learning some assembly, when preserving the ESP register before a function call does it matter if you do it by adding or subtracting? hard to explain, consider the following mov esi, esp sub esp, 12 // on 32bit OS this would mean that there are 3 arguments to the function // push, function call etc cmp esi, esp // should be the same or mov esi, esp // push, function call etc add esp, 12 cmp esi, esp // should be the same Also if for some reason the cmp fails, is it safe to do mov esp, esi to re-align the stack? Thanks EDIT: Also how come i need to do this for a call like sprintf, but MessageBox seems to fix ESP for me? How am i to know what function needs this and what doesn't?

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  • conversion of assembly

    - by lego69
    hello, can somebody please explain is it possible to convert this snippet of the code to assembly of pdp11? movq %rdi, -8(%rbp) movl %esi, -12(%rbp) movl %edx, -16(%rbp) movl -16(%rbp), %eax cltq leaq 0(,%rax,4), %rdi movq -8(%rbp), %r8 movl -12(%rbp), %eax cltq leaq 0(,%rax,4), %rcx movq -8(%rbp), %rsi movl -16(%rbp), %eax cltq leaq 0(,%rax,4), %rdx movq -8(%rbp), %rax movl (%rdx,%rax), %eax addl (%rcx,%rsi), %eax movl %eax, (%rdi,%r8) movl -12(%rbp), %eax cltq leaq 0(,%rax,4), %rdi movq -8(%rbp), %r8 movl -16(%rbp), %eax cltq leaq 0(,%rax,4), %rcx movq -8(%rbp), %rsi movl -12(%rbp), %eax cltq leaq 0(,%rax,4), %rdx movq -8(%rbp), %rax movl (%rdx,%rax), %edx movl (%rcx,%rsi), %eax subl %edx, %eax movl %eax, (%rdi,%r8) movl -16(%rbp), %eax cltq leaq 0(,%rax,4), %rdi movq -8(%rbp), %r8 movl -16(%rbp), %eax cltq leaq 0(,%rax,4), %rcx movq -8(%rbp), %rsi movl -12(%rbp), %eax cltq leaq 0(,%rax,4), %rdx movq -8(%rbp), %rax movl (%rdx,%rax), %edx movl (%rcx,%rsi), %eax subl %edx, %eax movl %eax, (%rdi,%r8) leave ret it is only small part of all code that I have...

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  • Test assembly code on a mac

    - by happyCoding25
    Hello, A while back I was following some tutorials an assembly. I was running it all on a windows machine, compiling with NASM and then writing the compiled code to a floppy disk, then reboot and try the code. This process was long and time consuming and sadly was not on a mac. When I found out that Xcode for mac installed NASM I immediately tried to compile some code. The code compiled fine. The issue is testing it. On a mac I have no floppy (not like I want to use one) so Im not sure how to test this. I looked in to Q (kju) and found it would only emulate things on an ISO file. So I guess what Im asking is is it possible to install the compiled code on an ISO file for testing? (Note: the code when compiled forms a .bin file) Thanks for any help

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