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Questions tagged [opcodes]

47 questions
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Fetching variable length opcodes and CPU timing

I'm currently trying to write a NES emulator in C++ as a summer programming project to get ready for fall term next school year (I haven't coded in a while). I've already written a Chip8 emulator, so I thought the next step would be to try and…
Sean K
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C++ Translate bytes to opcodes?

I am not sure how to word this question but, I am curious to find out how assemblers and other tools show the opcodes of certain bytes? std::string BytesToOpcode( __in ::BYTE Bytes ); int main( void ) { std::cout << BytesToOpcode( ( ::PBYTE…
Xorr
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Using C# OpCodes to emit method that returns an object

I am creating a dynamic type which has a method that I'd like to return an object. I am failing to understand how to achieve this. Here's what I have so far: // .. stuff to create type builder MethodBuilder builder = …
OnResolve
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Regular expression-like pattern matching on IEnumerable instead of string chars in C#

I am trying to modify a list of CIL code instructions in C#. Common tasks include finding groups or patterns of instructions and replacing them with other instructions while reusing some of the information from the original match. That sounds a lot…
Andreas Pardeike
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Extract opcodes from the entry point of an executable

I am working with the objdump command to decompile an executable and extract the opcodes, I need to know if I can extract the opcodes from the entry point of the file, because now I do it from the sections.
Stone
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Java - write opcodes to .class file (for a custom compiler)

I played a bit around with Compilers. And I want to compile my language into JVM Bytecode but I was wondering how I could write those Opcodes to a .class file. Example: I have my .atan src file and I want to compile this to a .class file. I can…
John E.
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DynamicMethod - Common language runtime detected an invalid program

So I try to call a method from an extern DLL via a dynamicmethod using the ilgenerator. delegate void Write(string text); static void Main(string[] args) { byte[] bytes = File.ReadAllBytes(@"externmethod.dll"); var assembly =…
Justus Bosschieter
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SIGSEGV at executing machine code from array on ARMv6

I'm trying to execute machine code stored in array on first Raspberry Pi under ArchLinux. I've done it under x86, but I can't get what I'm doing wrong under ARMv6. The problem is that it doesn't matter what code is in the array, it will always crash…
cafebabe_t
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Cython: use globals().update(...)?

I am writing a Python bytecode optimizer for a module that previously had a Cython tool-chain. While that may be deprecated by now, I encountered something strange while fiddling with it. Consider this simple piece of code: from opcode import…
hellerve
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Calling A Method That Was Just Created. Error Calculating Max Stack Value

so I was fooling around with DNLIB recently, and I was trying to add methods to a .net file. I got the methods from a previously compiled file, so basically, I was trying to mimic the method. There are 3 methods: GetTheTypes, InvokeIt, and…
Mephobia
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IL Opcode Modification

Language: VB.NET 3.5 IL opcodes: 718 ldarg.0 719 callvirt System.Windows.Forms.Button RClient.RClient::get_cmd1() 724 ldarg.0 725 ldfld System.String[] RClient.RClient::ButtonStrings 730 ldc.i4.5 731 ldelem.ref…
Dacto
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Printing Opcodes to a File

Just curious, if open a hex editor and type opcodes manually and save it. Such as move 1 to register 1 move 2 to register 2 then call add, would that give me working program? Or does some how automating this gives me crappy compiler? EDIT: Forgot…
Hamza Yerlikaya
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How to Convert ASM Code(opcodes) To String

How can I convert assembly codes to string like this in PHP: $shellcode…
user2040816
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Opcode reading of a classfile at runtime with the use of ASM4

Does anybody have any document, which can show me end to end implementation of ASM framework to display opcode of a class file? Or is there any body help me with Hello, World! Program example for ASM frame implementation? I want to display opcodes…
Prathako
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Is there an allocate winapi call in x86 EXEs?

How is allocation handled within a C++ compiled EXE? Is the allocation manager baked into the app making it impossible to track allocations / unallocations if you don't have the code? Or is there a WinAPI call or something similar for memory…
Robin Rodricks
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