x86-64 Questions

Ubuntu – GCC Output Symbol not Relocatable with -fPIC

November 14, 2024
TheAhmad
2 Answers

On an Ubuntu 24.04, using the default GCC-13.2 compiler I compiled a source file with -fPIC option to produce relocatable binary: /usr/bin/c++ -v -DBPFTIME_BUILD_WITH_LIBBPF=1 -DSPDLOG_COMPILED_LIB -Dbpftime_text_segment_transformer_EXPORTS -I/home/ahmad/Programs/bpftime/build/build/FridaGum-prefix/src/FridaGum -I/home/ahmad/Programs/bpftime/third_party/spdlog/include -fno-omit-frame-pointer -O3 -DNDEBUG -std=gnu++20 -fPIC -o text_segment_transformer.cpp.o -c /home/ahmad/Programs/bpftime/attach/text_segment_transformer/text_segment_transformer.cpp The compiler output…

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Debian – Truncating floats to int on x86 vs x86_64 has different rounding error

October 27, 2024
umläute
2 Answers

I stumbled upon a failing unit-test, that involves converting doubles to integers. The actual number that is converted is 1.234 * 1000., and the code basically boils down to: #include <iostream> #include <cstdint> int64_t deltatime(double numSeconds) { return (int64_t) (numSeconds…

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Visual Studio Code – Why does it seem as though the compiler is repurposing Argc and Argv in my function?

October 7, 2024
Edward Severinsen
2 Answers

main.cpp code: #include <iostream> int main() { std::cout << "Hello World!n"; } Dissasembly in Ghidra: ************************************************************* * FUNCTION ************************************************************* int __cdecl main (int _Argc , char * * _Argv , char * * _E assume GS_OFFSET = 0xff00000000 int EAX:4…

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Unable to Install TensorFlow 2.16.1 on Ubuntu 22.04 with Python 3.10.12

June 9, 2024
Aria
2 Answers

I am trying to install TensorFlow 2.16.1 on my Ubuntu 22.04 system using pip, but I keep encountering an error saying that no matching distribution is found. Below are the details of my system: OS: Ubuntu 22.04.4 LTS Python Version:…

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Visual Studio Code – Ensuring x64 compliance of custom ASM-function in clang-cl

March 21, 2024
Juliean
2 Answers

For my custom compiled native x64 JIT-code, I have certain instrinsic functions. A lot of them are just called from my code, thus I will generate with my own compiler. Some of them however are directly called from c++-code, and…

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Running 32-bit Programs in CentOS 7 Container on OpenWrt: Troubleshooting Steamcmd Issue

January 31, 2024
Conc Tsai
2 Answers

I'm running a CentOS 7 container inside a Docker on OpenWrt with the following kernel version: Linux iStoreOS 5.10.176 #0 SMP Tue Jul 25 05:14:16 2023 x86_64 GNU/Linux. However, no matter what I try, I can't run the 32-bit version…

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Does the System V ABI on Ubuntu place the return address within the caller function's frame or the callee function's frame?

August 28, 2023
alessio solari
2 Answers

My system : Ubuntu 22.04.3 running on x86_64. GCC version 11.4.0 I'm asking this because it seems like there are two different representations of the return address as far as the frame it is within ( caller or callee )…

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Is it correct to compile a C program with the gcc flag -fno-stack-protector in Ubuntu?

August 23, 2023
alessio solari
2 Answers

*I'm on an Ubuntu x86_64 system, gcc 11.4.0 I have this C program in a file test.c : int fx( int a, int* b ){ *b = 12; return a; } int main(){ int a = 20; int b =…

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Ubuntu – Do the disassemblers otool and objdump output the exact machine instructions contained in an executable?

August 15, 2023
alessio solari
2 Answers

I have this simple C program in a file named test.c : void fx2(){ int c = 30; c++; } void fx1(){ int b = 20; b++; fx2(); } int main(){ int a = 10; a++; fx1(); } I've compiled…

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Centos – How to shell_exec program_linux_i386 from PHP

July 20, 2023
Kane Pro
2 Answers

I downloaded (mdldec_linux_amd64) and (mdldec_linux_i386) and placed them somewhere in cPanel / Files Manager / HTML folder How to call this program from Call.PHP ? I try something like below shell_exec ("mdldec_linux_amd64 parameter1 parameter2"); can someone help me on this?

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