Arti Zirk
2de3a91b0a
subrepo: subdir: "libopencm3" merged: "88e91c9a7cce" upstream: origin: "https://github.com/libopencm3/libopencm3.git" branch: "master" commit: "88e91c9a7cce" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
145 lines
5.2 KiB
Plaintext
145 lines
5.2 KiB
Plaintext
------------------------------------------------------------------------------
|
|
README
|
|
------------------------------------------------------------------------------
|
|
|
|
LIBOPENCM3 LINKER SCRIPT GENERATOR
|
|
----------------------------------
|
|
|
|
This folder contains files needed for the automatic linker script generation
|
|
mechanism developed for libopencm3 library.
|
|
|
|
File contents
|
|
-------------
|
|
|
|
* {ROOT}/ld/tests/* - Prepared tests for the testing of the script
|
|
* {ROOT}/ld/devices.data - Device database file
|
|
* {ROOT}/ld/linker.ld.S - Linker script template
|
|
* {ROOT}/scripts/genlink.py - Device database file search script
|
|
* {ROOT}/scripts/genlinktest.sh - Device database file search test script
|
|
|
|
Principle of operation
|
|
----------------------
|
|
|
|
The user specifies in the project Makefile the device part name the project is
|
|
using, in the variable DEVICE. Note that full device part name must be
|
|
specified, because the device specific features is usually dependent on the
|
|
last characters of device name string. Note that the device name string search
|
|
is case insensitive.
|
|
|
|
DEVICE=stm32f407vgt6
|
|
|
|
Device database contains definitions of common sections and its origins for
|
|
the linker preprocessor. Every definition is interpreted in the linker script
|
|
template as a macro, and it can be used for conditional insertion of the device
|
|
dependent stuff.
|
|
|
|
The search in the device database is pattern-based, and using python script
|
|
genlink.py. The python script traverses the file as a tree, joining the options
|
|
for the preprocessor together by single space. The python script adds -D to
|
|
each parameter for you.
|
|
|
|
Testing
|
|
-------
|
|
|
|
The testing of feature is done by executing in the root of libopencm3 library.
|
|
|
|
make genlinktests
|
|
|
|
The test cases are defined in subdirectory {ROOT}/ld/tests/. Each test contains
|
|
two files, the database file *.data and the expected result *.result file. If
|
|
the particular test fails, the file *.out containing output of the script is
|
|
not deleted to help resolving problem with the script.
|
|
|
|
The search pattern for the test is the base filename of particular test.
|
|
|
|
The testing stops after all test cases are valid, or at first error found.
|
|
|
|
Example of use
|
|
--------------
|
|
|
|
* Check the documentation for the genlink module in /mk/README.
|
|
|
|
Device database file structure
|
|
------------------------------
|
|
|
|
Line description:
|
|
<pattern> <parent> (<data> ...)
|
|
|
|
<pattern>: is the pattern for the chip description to be searched for.
|
|
The case of the pattern string is ignored.
|
|
Pattern match symbols:
|
|
? - matches exactly one character
|
|
* - matches none or more characters
|
|
+ - matches single or more characters
|
|
|
|
<parent>: is the parent group name, where the search will continue.
|
|
There are special parents names that controls traversing:
|
|
"END" - Exit traversal.
|
|
"+" - Don't change the parent. Use for split long line to two.
|
|
|
|
<data>: space-separated list of preprocessor symbols supplied to the linker.
|
|
-D option name with single underscore is automatically prepended to each
|
|
symbol definition
|
|
if the symbol starts with dash "-", it is interpreted as parameter to
|
|
linker, and no -D or underscore is generated.
|
|
|
|
All lines starting with # symbol are treated as Comments
|
|
|
|
Recommended tree hierarchy:
|
|
|
|
<device name> <family group> <device specific params>
|
|
+- <family group> <family> <family group specific params>
|
|
+- <family> <architecture> <device family specific params>
|
|
+- <architecture> END <architecture specific params>
|
|
|
|
You can split the long line into two or more by using "+" in the parent field,
|
|
and defining same regex with appropriate parent on the next line. Example:
|
|
|
|
device + PARAM1=aaa PARAM2=bbbb PARAM3=ccc PARAM4=dddd PARAM5=eeee
|
|
device parent PARAM6=ffff PARAM7=gggg PARAM8=hhhh
|
|
parent END
|
|
|
|
The order of the lines is important. After the regex match, its parent will
|
|
be used for match on the next line. If two regexp lines matches input, only
|
|
the first will be evaluated, except special group definition "+"
|
|
|
|
The regex matches entire sym
|
|
|
|
Example:
|
|
|
|
--- devices.data file ---
|
|
stm32f05[01]?4* stm32f0 ROM=16K RAM=4K
|
|
stm32f0 stm32 ROM_OFF=0x08000000 RAM_OFF=0x20000000 -mcpu=cortex-m0 -mthumb
|
|
stm32 END
|
|
|
|
--- queried chip name ---
|
|
stm32f051c4t6
|
|
|
|
--- output of the python script ---
|
|
-D_ROM=16K -D_RAM=4K -D_ROM_OFF=0x08000000 -D_RAM_OFF=0x20000000
|
|
|
|
The generated linker script file will contain sections rom and ram with
|
|
appropriate initialization code, specified in linker file source linker.ld.S
|
|
|
|
|
|
Copyright
|
|
---------
|
|
|
|
This file is part of the libopencm3 project.
|
|
|
|
Copyright (C) 2013 Frantisek Burian <Bufran@seznam.cz>
|
|
Copyright (C) 2013 Werner Almesberger <wpwrak>
|
|
|
|
This library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this library. If not, see <http://www.gnu.org/licenses/>.
|