This document provides a brief overview as well as usage information for the GNU* Project Debugger (GDB) based debug solutions shipped with Intel® System Studio 2020. It also provides pointers to where you can find additional product information, technical support, articles and whitepapers.
Please refer to the general Intel® System Studio 2020 release notes for an introduction to the entire suite.
This section provides an overview of recent changes to GDB based debug solutions. For information on what is new in other components of Intel® System Studio 2020, please read the individual component release notes.
Initial Version (Intel® System Studio 2020)
- GDB 8.3 (application debugger)
- Updated to include Python* 3
Please refer to the general Intel® System Studio 2020 release notes for a full list of system requirements. Only host/target systems specified there are supported.
Specific for GDB, the following features require either an Intel Atom® processor, or a 4th generation Intel® Core™ processor or later on the target system:
- Branch Trace Store (btrace)
The following features require a 5th generation Intel® Core™ processor or later on the target system:
- Intel® Processor Trace (Intel® PT)
See below for more information about those features.
To view the documentation of GDB, Intel® System Studio 2020 must be installed first. After installation, the documentations can be found relative to the installation directory <install‑dir> under the following locations:
Further information on how to use the debug solutions can be found here:
The version of GDB provided as part of Intel® System Studio 2020 is based on GDB version 8.3. Notably, it contains the following features added by Intel:
- Data Race Detection (pdbx):
Detect and locate data races for applications threaded using POSIX* threads.
- Open Multi-Processing Debugging (openmp):
Visualize additional information about OpenMP* tasks, locks, barriers, and others.
- Speculative Execution (tsx):
Convert Intel® Transactional Synchronization Extensions (Intel® TSX) abort reasons into human readable format.
- Intel® Processor Trace PTWRITE (ptwrite):
Customized printing of PTWRITE payloads in the instruction history and function-call history.
- Intel® Control-flow Enforcement Technology Debugging (cet):
New commands to display the shadow stack backtrace and CET status information.
Those features are only provided for the command line version and are not supported via the Eclipse* IDE Integration.
The provided GDB documentation (
gdb-ia/gdb.pdf) contains more information in the following chapters:
- “Debugging Data Race Conditions”: pdbx feature
- “Debugging Open Multi-Processing (OpenMP*)”: openmp feature
- “Decoding Abort Reasons of a Speculative Execution”: tsx feature
- “Python* modules: gdb.ptwrite”: ptwrite feature
- “Control-flow Enforcement Debugging”: cet feature
Eclipse* IDE Features
- Function Call History:
Visualizes Branch Trace Store & Intel® Processor Trace data. Available via menu (in Debug perspective):
Window->Show View->Function Call History
In non-Debug perspective:
Window->Show View->Other…, Debug->Function Call History
During the installation process of Intel® System Studio 2020, GNU* GDB 8.3 will be installed by default. Otherwise, make sure it appears in the component list as needed.
In case it is not, or you want to modify the default, select Customize and navigate through the menus to change components:
Continue via button Next and finish the installation.
Please note that the sources for GDB and Python* are not required for normal operation.
The provided debug solution will be automatically integrated into an Eclipse* IDE of your choice. If you do not specify one (default: Install Eclipse* IDE…) it provides an own Eclipse* IDE. This takes place if you continue with the installation of Intel® System Studio 2020. Activate the item Integrate with my existing installation of Eclipse; and provide the path to the Eclipse* IDE installed in the dialog below. Leave the default when you want to use the shipped Eclipse* IDE or turn off integration via third item.
The following issues are known for the current release:
Eclipse* IDE integration requires initial installation
Integration of the provided GDB into Eclipse* IDE is only possible during initial installation. It can neither be changed, nor selected or unselected without entirely uninstalling Intel® System Studio 2020 and rerunning the installation.
CDT 8.0 is not supported for the debugger plug-in
The general Intel® System Studio 2020 release notes list support for CDT 8.0 and higher. However, the GDB-IA (DSF) debugger plug-in is only supported for CDT 8.1 and higher.
Manually installing provided Eclipse* IDE plug-ins requires a certain order
When manually installing Eclipse* IDE plug-ins that come with Intel® System Studio 2020 a certain order must be maintained. The plug-in of the debugger has a dependency on the one of the compiler. Hence, the plug-in of the compiler must be installed prior to the one of the debugger. When removing the compiler (or it’s plug-in), the plug-in of the debugger must be removed first.
We strongly recommend using the Eclipse* IDE integration feature of the Intel® System Studio 2020 installer rather than manually installing the plug-ins.
Security extensions hinder gdbserver to start
Integrity Measurement Architecture (IMA), e.g. Wind River Linux 5:
Start of gdbserver fails with Permission denied. Log file /var/log/syslog reads:
<date>WR-IntelligentDevice kernel: [???] IMA_Measurement: ERROR: <path_to_gdbserver>/gdbserver failed appraisement
To use gdbserver turn off IMA when building the image via --without-layer=wr-srm.
IMA can also be deactivated without a rebuild by specifying ima_appraise=off with the kernel boot options.
Start of gdbserver fails with gdbserver: Cannot call inferior functions, Linux kernel PaX protection forbids return to non-executable pages!
To use gdbserver specify pax_softmode=1 in the kernel boot options ("permit by default" mode). This requires that the gdbserver executable is attributed with the correct permissions. Use the paxctl tool to do so:
$ paxctl –c <path_to_gdbserver>/gdbserver
$ paxctl –perms <path_to_gdbserver>/gdbserver
For more information please refer to the PaX documentation.
Evaluation of expressions with side-effects
The debugger does not evaluate expressions that contain assignments which read memory locations before writing to them (e.g. x = x + 1). Please do not use such assignments when evaluating expressions.
Function Call History in Eclipse* IDE only shown for thread causing event
Displaying the Function Call History in Eclipse* IDE only works for the thread that caused an event (i.e. a stop). It is currently not possible to switch the Function Call History to another thread. This will be fixed in a future release.
This product includes software developed at:
GDB – The GNU* Project Debugger
Copyright Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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This program is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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