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diff --git a/docs/part-2/4_xds-gdb.md b/docs/part-2/4_xds-gdb.md new file mode 100644 index 0000000..5fe0ab9 --- /dev/null +++ b/docs/part-2/4_xds-gdb.md @@ -0,0 +1,201 @@ +# xds-gdb: wrapper on gdb for XDS + +`xds-gdb` is a wrapper on gdb debugger for X(cross) Development System. + +This tool allows you to debug an application built with an xds-server without +the need to install gdb or any cross tool. + +Two debugging models are supported: + +1. native debugging + +1. XDS remote debugging requiring an XDS server and allowing cross debug your + application. + + + By default XDS remote debug is used and you need to define `XDS_NATIVE_GDB` +variable to use native gdb debug mode instead. + +> **SEE ALSO**: [xds-server](https://github.com/iotbzh/xds-server), a web server +used to remotely cross build applications. +> **SEE ALSO**: [xds-exec](https://github.com/iotbzh/xds-exec), +wrappers on `exec` command that allows to cross build your application through `xds-server`. + +## Getting Started + +## Installing xds-gdb + +Download latest `xds-gdb` release on [https://github.com/iotbzh/xds-gdb/releases](https://github.com/iotbzh/xds-gdb/releases). + +Extract the tarball anywhere you want, for example: + +```bash +mkdir -p ~/opt/bin +unzip -j $DOWNLOAD_DIR/xds-gdb_linux-amd64-v1.0.0.zip xds-gdb/xds-gdb ~/opt/bin +``` + +## Configuration + + `xds-gdb` configuration is defined by variables (see listed below). + These variables may be set using : + +- environment variables (inherited), +- or a config file set with `XDS_CONFIG` environment variable, for example: + `XDS_CONFIG=/tmp/my_xds_gdb_config.env xds-gdb` +- or by setting variables within a gdb ini file (see details below), +- or a "user" config file located in following directory (first found is taken): + 1. $(CURRENT_DIRECTORY)/.xds-gdb.env + 1. $(CURRENT_DIRECTORY)/../xds-gdb.env + 1. $(CURRENT_DIRECTORY)/target/xds-gdb.env + 1. $(HOME)/.config/xds/xds-gdb.env + +### Configuration Variables + + `XDS_CONFIG` : + Config file defining `XDS_xxx` configuration variables. Variables of this file + will overwrite inherited environment variables. Variables definition may be + prefixed or not by "export" keyword. + Here is an example of + +```bash +cat $HOME/myProject/xds-gdb.env + +export XDS_SERVER_URL=http://xds-docker:8000 +export XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject +export XDS_SDK_ID=poky-agl_aarch64_4.0.1 +``` + +`XDS_LOGLEVEL` : +Set logging level (supported levels: panic, fatal, error, warn, info, debug) + +`XDS_LOGFILE` : +Set logging file, default `/tmp/xds-gdb.log`. + +`XDS_NATIVE_GDB` : +Use native gdb mode instead of remote XDS server mode. + +`XDS_PROJECT_ID` : *(mandatory with XDS server mode)* +Project ID you want to build + +`XDS_RPATH` : +Relative path into project + +`XDS_SDK_ID` : *(mandatory with XDS server mode)* +Cross Sdk ID to use to build project + +`XDS_SERVER_URL` : *(mandatory with XDS server mode)* +Remote XDS server url + +### Configuration variables set within gdb init command file + +Above `XDS_xxx` variables may also be defined within gdb init command file +(see --command or -x option of genuine Gdb). +You must respect the following syntax: commented line including `:XDS-ENV:` tag + +Example of gdb init file where we define project and sdk ID: + +```bash + # :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject + # :XDS-ENV: XDS_SDK_ID=poky-agl_aarch64_4.0.1 +``` + +## Using xds-gdb from command line + +### XDS remote debugging mode + +First the project you want to debug must be declared on an xds-server and this +project may also has been built using this xds-server (see [xds-server](https://github.com/iotbzh/xds-server) for more details). + +So to debug it you need to know the xds-server url (eg. <http://xds-docker:8000>), +you also need the project and sdk unique id. You can find these IDs in project +page of XDS dashboard or you can get them from command line using the `--list` +option. +This option lists all existing projects ID: + +```bash +XDS_SERVER_URL=http://xds-docker:8000 xds-gdb --list +``` + +Now to refer your project, just set `XDS_PROJECT_ID` and `XDS_SDK_ID` variables. + +You are now ready to use `xds-gdb` to for example cross debug your project. +Here is an example to build and debug a project based on CMakefile and +[AGL app-templates](https://git.automotivelinux.org/apps/app-templates/): + +```bash +# Go into your project directory (for example helloworld-service) +git clone https://github.com/iotbzh/helloworld-service.git +cd helloworld-service + +# Declare your project on xds-server +# <for now, you can only do this step using xds HTML dashboard (see xds-server doc)> + +# Define XDS config +cat <<EOF >./xds-config.env +XDS_SERVER_URL=http://xds-docker:8000 +XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject +XDS_SDK_ID=poky-agl_aarch64_4.0.1 +EOF + +# Tell to xds-exec and xds-gdb which is your config file +export XDS_CONFIG=../xds-config.env + +# Create a new build directory +mkdir build && cd build + +# Start remote cross build +xds-exec -- cmake .. +xds-exec -- make +xds-exec -- make remote-target-populate + +# Start debugging +xds-gdb -x target/gdb-on-root@myTarget.ini +``` + +> **Notes** : [Helloworld-service project](https://github.com/iotbzh/helloworld-service) +is an AGL project based on app-templates that can be build and debug using XDS. + +### Native debugging + +To enable native debugging mode, you need to define `XDS_NATIVE_GDB` variable. + +## Using xds-gdb within an IDE + +### Netbeans + +__Netbeans 8.x :__ +Open menu Tools -> Options +Then open C/C++ tab, in "Build Tools" sub-tab, click on "Add" button: + + +Then, you should set *Debugger Command* to point to xds-gdb + + + +### Others IDE + +*Coming soon...* + +## How to build xds-gdb from scratch + +### Prerequisites + + You must install and setup [Go](https://golang.org/doc/install) version 1.7 or + higher to compile this tool. + +### Building + +Clone this repo into your `$GOPATH/src/github.com/iotbzh` and use delivered Makefile: + +```bash + export GOPATH=$(realpath ~/workspace_go) + mkdir -p $GOPATH/src/github.com/iotbzh + cd $GOPATH/src/github.com/iotbzh + git clone https://github.com/iotbzh/xds-gdb.git + cd xds-gdb + make +``` + +## Debug + +Visual Studio Code launcher settings can be found into `.vscode/launch.json`. |