AMD ROCm Debugger

The AMD ROCm Debugger (ROCgdb) is the AMD ROCm source-level debugger for Linux based on the GNU Debugger (GDB). It enables heterogeneous debugging on the AMD ROCm platform of an x86-based host architecture along with AMD GPU architectures and supported by the AMD Debugger API.

The AMD ROCm Debugger is installed by the rocm-gdb package. The rocm-gdb package is part of the rocm-dev meta-package, which is in the rocm-dkms package.

The current AMD ROCm Debugger (ROCgdb) is an initial prototype that focuses on source line debugging. Note, symbolic variable debugging capabilities are not currently supported.

You can use the standard GDB commands for both CPU and GPU code debugging. For more information about ROCgdb, refer to the ROCgdb User Guide, which is installed at:

  • /opt/rocm/share/info/gdb.info as a texinfo file

  • /opt/rocm/share/doc/gdb/gdb.pdf as a PDF file

The AMD ROCm Debugger User Guide is available as a PDF at:

https://github.com/RadeonOpenCompute/ROCm/blob/master/gdb.pdf

For more information about GNU Debugger (GDB), refer to the GNU Debugger (GDB) web site at: http://www.gnu.org/software/gdb

AMD Debugger API

Introduction

The AMD Debugger API (ROCdbgapi) is a library that provides all the support necessary for a debugger and other tools to perform low level control of the execution and inspection of execution state of AMD™ commercially available GPU architectures.

For more information about the AMD ROCm ecosystem, see:

Build the AMD Debugger API Library

The ROCdbgapi library can be built on Ubuntu 16.04, Ubuntu 18.04, Centos 8.1, RHEL 8.1, and SLES 15 Service Pack 1.

Building the ROCdbgapi library has the following prerequisites:

  1. A C++14 compiler such as GCC 5 or Clang 3.4.

  2. AMD Code Object Manager Library (ROCcomgr) which can be installed as part of the AMD ROCm release by the comgr package.

  3. ROCm CMake modules which can be installed as part of the AMD ROCm release by the rocm-cmake package.

An example command-line to build and install the ROCdbgapi library on Linux is:

cd rocdbgapi
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../install ..
make

You may substitute a path of your own choosing for CMAKE_INSTALL_PREFIX.

The built ROCdbgapi library will be placed in:

  • build/include/amd-dbgapi.h

  • build/librocm-dbgapi.so*

To install the ROCdbgapi library:

make install

The installed ROCdbgapi library will be placed in:

  • ../install/include/amd-dbgapi.h

  • ../install/lib/librocm-dbgapi.so*

  • ../install/share/amd-dbgapi/LICENSE.txt

  • ../install/share/amd-dbgapi/README.md

To use the ROCdbgapi library, the ROCcomgr library must be installed. This can be installed as part of the AMD ROCm release by the comgr package:

  • libamd_comgr.so.1

Build the AMD Debugger API Specification Documentation

Generating the AMD Debugger API Specification documentation has the following prerequisites:

  1. For Ubuntu 16.04 and Ubuntu 18.04 the following adds the needed packages:

    apt install doxygen graphviz texlive-full
    

    NOTE: The doxygen 1.8.13 that is installed by Ubuntu 18.04 has a bug that prevents the PDF from being created. doxygen 1.8.11 can be built from source to avoid the issue.

  2. For CentOS 8.1 and RHEL 8.1 the following adds the needed packages:

    yum install -y doxygen graphviz texlive texlive-xtab texlive-multirow \
      texlive-sectsty texlive-tocloft texlive-tabu texlive-adjustbox
    

    NOTE: The doxygen 1.8.14 that is installed by CentOS 8.1 and RHEL 8.1, has a bug that prevents the PDF from being created. doxygen 1.8.11 can be built from source to avoid the issue.

  3. For SLES 15 Service Pack 15 the following adds the needed packages:

    zypper in doxygen graphviz texlive-scheme-medium texlive-hanging \
      texlive-stackengine texlive-tocloft texlive-etoc texlive-tabu
    

An example command-line to generate the HTML and PDF documentation after running the above cmake is:

make doc

The generated ROCdbgapi library documentation is put in:

  • doc/html/index.html

  • doc/latex/refman.pdf

If the ROCdbgapi library PDF documentation has been generated, make install will place it in:

  • ../install/share/doc/amd-dbgapi/amd-dbgapi.pdf

Known Limitations and Restrictions

You can refer to the following sections in the AMD Debugger API Specification documentation for:

  • Supported AMD GPU Architectures provides the list of supported AMD GPU architectures.

  • Known Limitations and Restrictions provides information about known limitations and restrictions.

The ROCdbgapi library is compatible with the following interface versions:

  • AMD GPU Driver Version

    • See KFD_IOCTL_MAJOR_VERSION and KFD_IOCTL_MINOR_VERSION in src/linux/kfd_ioctl.h which conform to semver.

  • AMD GPU Driver Debug ioctl Version

    • See KFD_IOCTL_DBG_MAJOR_VERSION and KFD_IOCTL_DBG_MINOR_VERSION in src/linux/kfd_ioctl.h which conform to semver.

  • ROCm Runtime r_debug ABI Version

    • See ROCR_RDEBUG_VERSION in src/rocr_rdebug.h.

  • Architectures and Firmware Versions

    • See s_gfxip_lookup_table in src/os_driver.cpp.

Disclaimer

The information contained herein is for informational purposes only and is subject to change without notice. While every precaution has been taken in the preparation of this document, it may contain technical inaccuracies, omissions and typographical errors, and AMD is under no obligation to update or otherwise correct this information. Advanced Micro Devices, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this document, and assumes no liability of any kind, including the implied warranties of noninfringement, merchantability or fitness for particular purposes, with respect to the operation or use of AMD hardware, software or other products described herein. No license, including implied or arising by estoppel, to any intellectual property rights is granted by this document. Terms and limitations applicable to the purchase or use of AMD products are as set forth in a signed agreement between the parties or in AMD™ Standard Terms and Conditions of Sale.

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