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c-user: Split up fatal error manager

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This makes it easier to automatically generate parts of the module
documentation in the future.

Update #3993.
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Sebastian Huber 2021-04-21 09:29:29 +02:00
parent f3262d4074
commit 62ca9c1bc3
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c-user/fatal_error.rst → c-user/fatal-error/background.rst
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@ -2,35 +2,6 @@
.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR) .. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
.. index:: fatal errors
.. _fatal_error_manager:
Fatal Error Manager
*******************
Introduction
============
The fatal error manager processes all fatal or irrecoverable errors and other
sources of system termination (for example after :c:func:`exit()`). Fatal
errors are identified by the (fatal source, error code) pair. The directives
provided by the fatal error manager are:
- rtems_fatal_ - Invoke the fatal error handler
- rtems_panic_ - Print a message and invoke the fatal error handler
- rtems_shutdown_executive_ - Shutdown RTEMS
- rtems_exception_frame_print_ - Print the CPU exception frame
- rtems_fatal_source_text_ - Return the fatal source text
- rtems_internal_error_text_ - Return the error code text
- rtems_fatal_error_occurred_ - Invoke the fatal error handler (deprecated)
Background Background
========== ==========
@ -383,274 +354,3 @@ INTERNAL_ERROR_TOO_LARGE_TLS_SIZE (41)
:ref:`CONFIGURE_MAXIMUM_THREAD_LOCAL_STORAGE_SIZE <CONFIGURE_MAXIMUM_THREAD_LOCAL_STORAGE_SIZE>`. :ref:`CONFIGURE_MAXIMUM_THREAD_LOCAL_STORAGE_SIZE <CONFIGURE_MAXIMUM_THREAD_LOCAL_STORAGE_SIZE>`.
You can get the thread-local storage size of an application using the RTEMS You can get the thread-local storage size of an application using the RTEMS
tool ``rtems-execinfo``. tool ``rtems-execinfo``.
Operations
==========
.. index:: _Terminate
.. _Terminate:
Announcing a Fatal Error
------------------------
The :c:func:`_Terminate()` internal error handler is invoked when the
application or the executive itself determines that a fatal error has occurred
or a final system state is reached (for example after :c:func:`rtems_fatal()`
or :c:func:`exit()`).
The first action of the internal error handler is to call the fatal extension of
the user extensions. For the initial extensions the following conditions are
required
- a valid stack pointer and enough stack space,
- a valid code memory, and
- valid read-only data.
For the initial extensions the read-write data (including .bss segment) is not
required on single processor configurations. In SMP configurations, however,
the read-write data must be initialized since this function must determine the
state of the other processors and request them to shut-down if necessary.
Non-initial extensions require in addition valid read-write data. The board
support package (BSP) may install an initial extension that performs a system
reset. In this case the non-initial extensions will be not called.
The fatal extensions are called with three parameters:
- the fatal source,
- a legacy parameter which is always false, and
- an error code with a fatal source dependent content.
Once all fatal extensions executed, the error information will be stored to
:c:data:`_Internal_errors_What_happened` and the system state is set to
:c:macro:`SYSTEM_STATE_TERMINATED`.
The final step is to call the CPU port specific :c:func:`_CPU_Fatal_halt()`.
Directives
==========
This section details the fatal error manager's directives. A subsection is
dedicated to each of this manager's directives and describes the calling
sequence, related constants, usage, and status codes.
.. raw:: latex
\clearpage
.. index:: announce fatal error
.. index:: fatal error, announce
.. index:: rtems_fatal
.. _rtems_fatal:
FATAL - Invoke the fatal error handler
--------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_fatal(
rtems_fatal_source fatal_source,
rtems_fatal_code error_code
) RTEMS_NO_RETURN;
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive terminates the system.
NOTE:
Registered :c:func:`atexit()` or :c:func:`on_exit()` handlers are not
called. Use :c:func:`exit()` in case these handlers should be invoked.
.. raw:: latex
\clearpage
.. index:: panic
.. index:: rtems_panic
.. _rtems_panic:
PANIC - Print a message and invoke the fatal error handler
----------------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_panic(
const char *fmt,
...
) RTEMS_NO_RETURN RTEMS_PRINTFLIKE( 1, 2 );
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive prints a message via :c:func:`printk` specified by the
format and optional parameters and then terminates the system with the
:c:macro:`RTEMS_FATAL_SOURCE_PANIC` fatal source. The fatal code is set to
the format string address.
NOTE:
Registered :c:func:`atexit()` or :c:func:`on_exit()` handlers are not
called. Use :c:func:`exit()` in case these handlers should be invoked.
.. raw:: latex
\clearpage
.. index:: shutdown RTEMS
.. index:: rtems_shutdown_executive
.. _rtems_shutdown_executive:
SHUTDOWN_EXECUTIVE - Shutdown RTEMS
-----------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_shutdown_executive(
uint32_t result
);
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive is called when the application wishes to shutdown RTEMS.
The system is terminated with a fatal source of ``RTEMS_FATAL_SOURCE_EXIT``
and the specified ``result`` code.
NOTES:
This directive *must* be the last RTEMS directive invoked by an application
and it *does not return* to the caller.
This directive may be called any time.
.. raw:: latex
\clearpage
.. index:: exception frame
.. index:: rtems_exception_frame_print
.. _rtems_exception_frame_print:
EXCEPTION_FRAME_PRINT - Prints the exception frame
--------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_exception_frame_print(
const rtems_exception_frame *frame
);
DIRECTIVE STATUS CODES:
NONE
DESCRIPTION:
Prints the exception frame via ``printk()``.
.. raw:: latex
\clearpage
.. index:: fatal error
.. index:: rtems_fatal_source_text
.. _rtems_fatal_source_text:
FATAL_SOURCE_TEXT - Returns a text for a fatal source
-----------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
const char *rtems_fatal_source_text(
rtems_fatal_source source
);
DIRECTIVE STATUS CODES:
The fatal source text or "?" in case the passed fatal source is invalid.
DESCRIPTION:
Returns a text for a fatal source. The text for fatal source is the
enumerator constant.
.. raw:: latex
\clearpage
.. index:: fatal error
.. index:: rtems_internal_error_text
.. _rtems_internal_error_text:
INTERNAL_ERROR_TEXT - Returns a text for an internal error code
---------------------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
const char *rtems_internal_error_text(
rtems_fatal_code error
);
DIRECTIVE STATUS CODES:
The error code text or "?" in case the passed error code is invalid.
DESCRIPTION:
Returns a text for an internal error code. The text for each internal
error code is the enumerator constant.
.. raw:: latex
\clearpage
.. index:: announce fatal error
.. index:: fatal error, announce
.. index:: rtems_fatal_error_occurred
.. _rtems_fatal_error_occurred:
FATAL_ERROR_OCCURRED - Invoke the fatal error handler (deprecated)
------------------------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_fatal_error_occurred(
uint32_t the_error
) RTEMS_NO_RETURN;
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive processes fatal errors. If the FATAL error extension is
defined in the configuration table, then the user-defined error extension
is called. If configured and the provided FATAL error extension returns,
then the RTEMS default error handler is invoked. This directive can be
invoked by RTEMS or by the user's application code including initialization
tasks, other tasks, and ISRs.
NOTES:
This directive is deprecated and should not be used in new code.
This directive supports local operations only.
Unless the user-defined error extension takes special actions such as
restarting the calling task, this directive WILL NOT RETURN to the caller.
The user-defined extension for this directive may wish to initiate a global
shutdown.

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c-user/fatal-error/directives.rst Normal file
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@ -0,0 +1,226 @@
.. SPDX-License-Identifier: CC-BY-SA-4.0
.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
Directives
==========
This section details the fatal error manager's directives. A subsection is
dedicated to each of this manager's directives and describes the calling
sequence, related constants, usage, and status codes.
.. raw:: latex
\clearpage
.. index:: announce fatal error
.. index:: fatal error, announce
.. index:: rtems_fatal
.. _rtems_fatal:
FATAL - Invoke the fatal error handler
--------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_fatal(
rtems_fatal_source fatal_source,
rtems_fatal_code error_code
) RTEMS_NO_RETURN;
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive terminates the system.
NOTE:
Registered :c:func:`atexit()` or :c:func:`on_exit()` handlers are not
called. Use :c:func:`exit()` in case these handlers should be invoked.
.. raw:: latex
\clearpage
.. index:: panic
.. index:: rtems_panic
.. _rtems_panic:
PANIC - Print a message and invoke the fatal error handler
----------------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_panic(
const char *fmt,
...
) RTEMS_NO_RETURN RTEMS_PRINTFLIKE( 1, 2 );
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive prints a message via :c:func:`printk` specified by the
format and optional parameters and then terminates the system with the
:c:macro:`RTEMS_FATAL_SOURCE_PANIC` fatal source. The fatal code is set to
the format string address.
NOTE:
Registered :c:func:`atexit()` or :c:func:`on_exit()` handlers are not
called. Use :c:func:`exit()` in case these handlers should be invoked.
.. raw:: latex
\clearpage
.. index:: shutdown RTEMS
.. index:: rtems_shutdown_executive
.. _rtems_shutdown_executive:
SHUTDOWN_EXECUTIVE - Shutdown RTEMS
-----------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_shutdown_executive(
uint32_t result
);
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive is called when the application wishes to shutdown RTEMS.
The system is terminated with a fatal source of ``RTEMS_FATAL_SOURCE_EXIT``
and the specified ``result`` code.
NOTES:
This directive *must* be the last RTEMS directive invoked by an application
and it *does not return* to the caller.
This directive may be called any time.
.. raw:: latex
\clearpage
.. index:: exception frame
.. index:: rtems_exception_frame_print
.. _rtems_exception_frame_print:
EXCEPTION_FRAME_PRINT - Prints the exception frame
--------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_exception_frame_print(
const rtems_exception_frame *frame
);
DIRECTIVE STATUS CODES:
NONE
DESCRIPTION:
Prints the exception frame via ``printk()``.
.. raw:: latex
\clearpage
.. index:: fatal error
.. index:: rtems_fatal_source_text
.. _rtems_fatal_source_text:
FATAL_SOURCE_TEXT - Returns a text for a fatal source
-----------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
const char *rtems_fatal_source_text(
rtems_fatal_source source
);
DIRECTIVE STATUS CODES:
The fatal source text or "?" in case the passed fatal source is invalid.
DESCRIPTION:
Returns a text for a fatal source. The text for fatal source is the
enumerator constant.
.. raw:: latex
\clearpage
.. index:: fatal error
.. index:: rtems_internal_error_text
.. _rtems_internal_error_text:
INTERNAL_ERROR_TEXT - Returns a text for an internal error code
---------------------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
const char *rtems_internal_error_text(
rtems_fatal_code error
);
DIRECTIVE STATUS CODES:
The error code text or "?" in case the passed error code is invalid.
DESCRIPTION:
Returns a text for an internal error code. The text for each internal
error code is the enumerator constant.
.. raw:: latex
\clearpage
.. index:: announce fatal error
.. index:: fatal error, announce
.. index:: rtems_fatal_error_occurred
.. _rtems_fatal_error_occurred:
FATAL_ERROR_OCCURRED - Invoke the fatal error handler (deprecated)
------------------------------------------------------------------
CALLING SEQUENCE:
.. code-block:: c
void rtems_fatal_error_occurred(
uint32_t the_error
) RTEMS_NO_RETURN;
DIRECTIVE STATUS CODES:
NONE - This function will not return to the caller.
DESCRIPTION:
This directive processes fatal errors. If the FATAL error extension is
defined in the configuration table, then the user-defined error extension
is called. If configured and the provided FATAL error extension returns,
then the RTEMS default error handler is invoked. This directive can be
invoked by RTEMS or by the user's application code including initialization
tasks, other tasks, and ISRs.
NOTES:
This directive is deprecated and should not be used in new code.
This directive supports local operations only.
Unless the user-defined error extension takes special actions such as
restarting the calling task, this directive WILL NOT RETURN to the caller.
The user-defined extension for this directive may wish to initiate a global
shutdown.

17
c-user/fatal-error/index.rst Normal file
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@ -0,0 +1,17 @@
.. SPDX-License-Identifier: CC-BY-SA-4.0
.. Copyright (C) 2021 embedded brains GmbH (http://www.embedded-brains.de)
.. index:: fatal errors
.. _RTEMSAPIClassicFatal:
Fatal Error Manager
*******************
.. toctree::
introduction
background
operations
directives

25
c-user/fatal-error/introduction.rst Normal file
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@ -0,0 +1,25 @@
.. SPDX-License-Identifier: CC-BY-SA-4.0
.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
Introduction
============
The fatal error manager processes all fatal or irrecoverable errors and other
sources of system termination (for example after :c:func:`exit()`). Fatal
errors are identified by the (fatal source, error code) pair. The directives
provided by the fatal error manager are:
- :ref:`rtems_fatal`
- :ref:`rtems_panic`
- :ref:`rtems_shutdown_executive`
- :ref:`rtems_exception_frame_print`
- :ref:`rtems_fatal_source_text`
- :ref:`rtems_internal_error_text`
- :ref:`rtems_fatal_error_occurred`

51
c-user/fatal-error/operations.rst Normal file
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@ -0,0 +1,51 @@
.. SPDX-License-Identifier: CC-BY-SA-4.0
.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
Operations
==========
.. index:: _Terminate
.. _Terminate:
Announcing a Fatal Error
------------------------
The :c:func:`_Terminate()` internal error handler is invoked when the
application or the executive itself determines that a fatal error has occurred
or a final system state is reached (for example after :c:func:`rtems_fatal()`
or :c:func:`exit()`).
The first action of the internal error handler is to call the fatal extension of
the user extensions. For the initial extensions the following conditions are
required
- a valid stack pointer and enough stack space,
- a valid code memory, and
- valid read-only data.
For the initial extensions the read-write data (including .bss segment) is not
required on single processor configurations. In SMP configurations, however,
the read-write data must be initialized since this function must determine the
state of the other processors and request them to shut-down if necessary.
Non-initial extensions require in addition valid read-write data. The board
support package (BSP) may install an initial extension that performs a system
reset. In this case the non-initial extensions will be not called.
The fatal extensions are called with three parameters:
- the fatal source,
- a legacy parameter which is always false, and
- an error code with a fatal source dependent content.
Once all fatal extensions executed, the error information will be stored to
:c:data:`_Internal_errors_What_happened` and the system state is set to
:c:macro:`SYSTEM_STATE_TERMINATED`.
The final step is to call the CPU port specific :c:func:`_CPU_Fatal_halt()`.

2
c-user/index.rst
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@ -44,7 +44,7 @@ RTEMS Classic API Guide (|version|).
region/index region/index
dual-ported-memory/index dual-ported-memory/index
io/index io/index
fatal_error fatal-error/index
board_support_packages board_support_packages
user-extensions/index user-extensions/index
config/index config/index

2
c-user/initialization/introduction.rst
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@ -7,7 +7,7 @@ Introduction
The Initialization Manager is responsible for initializing the Board Support The Initialization Manager is responsible for initializing the Board Support
Package, RTEMS, device drivers, the root filesystem and the application. The Package, RTEMS, device drivers, the root filesystem and the application. The
:ref:`Fatal Error Manager <fatal_error_manager>` is responsible for the system :ref:`RTEMSAPIClassicFatal` is responsible for the system
shutdown. shutdown.
The Initialization Manager provides only one directive: The Initialization Manager provides only one directive: