linuxlinux-kernelshared-librariesvdso

What is the difference between vdso32 amd vdsox32?

I apologize if the answer to this question is apparent, but why are there two versions[1] of the vdso for 32-bit executables on linux systems, and what is the criteria used to select among them?

* as can be found in /lib/modules/KERNEL_NAME/vdso

Solution

  • x32 is a Linux ABI which is kind of a mix between x86 and x64. It uses 32-bit address size but runs in full 64-bit mode, including all 64-bit instructions and registers available.