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4a2319a4d6
The frame-pointer-based backtrace does not work without enabling -fno-omit-frame-pointer explicitly and in most cases leads to page faults because non-pointer stack values are dereferenced during the walk. The best we can do is to limit the backtrace walk to the stack of the current thread to prevent page faults unrelated to the system state without the use of the backtrace utility. This commit introduces a printable Backtrace class usable in Genode::log(), Genode::trace(), etc. The class is based on the new function for_each_return_address(auto const &fn) that walks the stack in its limits and calls fn() for each discovered return address on the stack in the new os/include/os/backtrace.h. Archtecture-specific stack-pointer retrieval and walk loops are implemented in dedicated os/include/spec/<arch>/os/for_each_return_address.h files. Also, the well-known Genode::backtrace() function (which logs the return-address values) is provided for backwards compatibility. Fixes #5078
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Genode source-code repositories
===============================
This directory contains the source-code repositories of the Genode OS
Framework. Each sub directory has the same principle layout as described in the
build-system manual:
:Build-system manual:
[https://genode.org/documentation/developer-resources/build_system]
The build system uses a configurable selection of those reposities to obtain
the source codes for the build process. The repositories are not independent
but build upon of each other:
:'base':
This directory contains the source-code repository of the fundamental
frameworks and interfaces of Genode. Furthermore, it contains the generic
parts of core.
:'base-<platform>':
These directories contain platform-specific source-code repositories
complementing the 'base' repository. The following platforms are supported:
:'hw':
The hw platform hosts Genode on a custom microkernel specifically
developed for Genode. The name "hw" denotes that Genode is executed on
bare hardware without a 3rd-party kernel underneath.
:'linux':
Linux kernel (both x86_32 and x86_64)
:'nova':
NOVA hypervisor ([https://hypervisor.org])
:'foc':
Fiasco.OC is a modernized version of the Fiasco microkernel with a
completely revised kernel interface fostering capability-based
security. It is not compatible with L4/Fiasco.
:'okl4':
OKL4 kernel (x86_32 and ARM) developed at Open-Kernel-Labs.
:'pistachio':
L4ka::Pistachio kernel developed at University of Karlsruhe.
:'fiasco':
L4/Fiasco kernel developed at University of Technology Dresden.
:'sel4':
seL4 microkernel ([https://sel4.systems/])
:'os':
This directory contains the non-base OS components such as the init
component, device drivers, and basic system services.
:'demo':
This directory contains the source-code repository of various services and
applications that we use for demonstration purposes. For example, a graphical
application launcher called Launchpad and the Scout tutorial browser.
:'hello_tutorial':
Tutorial for creating a simple client-server scenario with Genode. This
repository includes documentation and the complete source code.
:'libports':
This source-code repository contains ports of popular open-source libraries
to Genode, most importantly the C library. The repository contains no
upstream source code but means to download the code and adapt it to Genode.
For instructions about how to use this mechanism, please consult the README
file at the top level of the repository. Among the 3rd-party libraries
are Qt5, freetype, ncurses, and Mesa.
:'dde_linux':
This source-code repository contains the device driver environment for
executing Linux subsystems as Genode components.
:'dde_ipxe':
This source-code repository contains the device-driver environment for
executing network drivers of the iPXE project.
:'dde_bsd':
This source-code repository contains the device-driver environment for
drivers of the OpenBSD operating system.
:'dde_rump':
This source-code repository contains the port of rump kernels, which are
used to execute subsystems of the NetBSD kernel as user level processes.
The repository contains a server that uses a rump kernel to provide
various NetBSD file systems to Genode.
:'pc':
This source-code repository hosts device drivers that are specific for PC
platforms. It depends on the 'dde_linux' repository.
:'ports':
This source-code repository hosts ports of 3rd-party applications to
Genode. The repository does not contain upstream source code but provides
a mechanism for downloading the official source distributions and adapt
them to the Genode environment. The used mechanism is roughly the same
as used for the 'libports' repository. Please consult 'libports/README'
for further information.
:'gems':
This source-code repository contains Genode applications that use
both native Genode interfaces as well as features of other high-level
repositories, in particular shared libraries provided by 'libports'.