The Online LLVM demo page had an option to generate LLVM C++ API code as backend from a source code. However, that demo page is now disabled. I was wondering how we can do it ourselves using the available LLVM tools. I tried the following which gives the following error I am using LLVM/Clang version 3.2. Answ…
Tag: x86-64
Ask GDB to list all functions in a program
How can you list all functions in a program with GDB? Answer info functions prints the names and data types of all defined functions. See 16 Examining the Symbol Table.
Is there any profiler that works with -fomit-frame-pointer on x86_64?
SysProf doesn’t properly generate call stack without it, GProf isn’t accurate at all. And also, are profilers that work without -fno-omit-frame-pointer as accurate as those that rely on it? Answer There are none that I’m aware of. With frame pointers, walking a stack is a fairly simple exerc…
32-bit process’s address space on 64-bit linux
In this answer author states: With the 64-bit x86_64 kernel, a 32-bit process can use the entire 4GB address space, except for a couple pages (8KB) at the end of the 4GB address space which are managed by the kernel. What is the purpose of this kernel-managed memory? Shouldn’t it be in the kernel space, to pr…
x86_64 Assembly Linux System Call Confusion
I am currently learning Assembly language on Linux. I have been using the book ‘Programming From the Ground Up’ and all the examples are 32-bit. My OS is 64-bit and I have been trying to do all the examples in 64-bit. I am having trouble however: This merely just calls the Linux exit System call o…