Skip to content

Latest commit

 

History

History
52 lines (34 loc) · 1.87 KB

kernel_isa_cpu.md

File metadata and controls

52 lines (34 loc) · 1.87 KB
Raw

Kernel ISA

This document describes how to use the Intercept Layer for OpenCL Applications to retrieve kernel ISA for Intel CPU Devices.

Tools

You will need:

  • The Intercept Layer for OpenCL Applications
  • readelf, dd, and objdump Utilities (or equivalents)

Process

Retrieving kernel ISA is a two step process: The first step is to dump program binaries while your application is executing. Then, the program binaries can be disassembled to view the kernel ISA in text form.

Dumping Program Binaries

Dumping program binaries is the easy part! Simply install the Intercept Layer for OpenCL Applications, set DumpProgramBinaries, and execute your application. Then, every time our application calls clBuildProgram, the Intercept Layer for OpenCL Applications will dump the program binary.

NOTE: The control to dump program binaries to disassemble for Intel CPU devices is DumpProgramBinaries, which is different than the control to dump kernel ISA binaries to disassemble for Intel GPU devices!

Disassembling Program Binaries

For the Intel CPU device, the program binary is an ELF file. ELF files consist of multiple "sections". The kernel ISA is stored in the ".ocl.obj" section. So, the steps to dissemble the program binary consists of:

  1. Extracting the kernel ISA from the ".ocl.obj" section of the program binary.
  2. Disassembling the extracted kernel ISA.

There are many possible ways to do this, but the script disassemble_cpu.sh shows one method using the common tools readelf, dd, and objdump.

Disassembling Many Kernel ISA Binaries

The Python script ../scripts/disassemble_all_cpu.py may be useful to disassemble all program binaries in a specified directory.

* Other names and brands may be claimed as the property of others.

Copyright (c) 2018-2024, Intel(R) Corporation