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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5279 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
2012-10-30 19:25:50 +00:00
parent 08404c8492
commit 2965981947
3 changed files with 725 additions and 703 deletions
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Documentation/NuttXBinfmt.html
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<p> <p>
<b>Binary Loaders</b>. <b>Binary Loaders</b>.
The purpose of a <i>binary loader</i> is to load and execute modules in various <i>binary formats</i> that reside in a file system. The purpose of a <i>binary loader</i> is to load and execute modules in various <i>binary formats</i> that reside in a file system.
Loading refers instiating the binary module in some fashion, usually copy all or some of the binary module into memory and then linking the module with other components. Loading refers instantiating the binary module in some fashion, usually copy all or some of the binary module into memory and then linking the module with other components.
In most architectures, it is thebase FLASH code that is the primary component that the binary module must link with because that is where the RTOS and primary tasks reside. In most architectures, it is the base FLASH code that is the primary component that the binary module must link with because that is where the RTOS and primary tasks reside.
Program modules can then be executed after they have been loaded. Program modules can then be executed after they have been loaded.
</p> </p>
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<b>NXFLAT</b>. <b>NXFLAT</b>.
NuttX NXFLAT formatted files. NuttX NXFLAT formatted files.
More information about the NXFLAT binary format can be found in the More information about the NXFLAT binary format can be found in the
<href="NuttXNxFlat.html">NXFLAT documentation</a>. <a href="NuttXNxFlat.html">NXFLAT documentation</a>.
</ul> </ul>
<p> <p>
<b>Executables and Libraries</b> <b>Executables and Libraries</b>
The generic binary loader logic does not care what it is that it being loaded. It could load an executable program or a library. The generic binary loader logic does not care what it is that it being loaded. It could load an executable program or a library.
There are no strict rules, but a library will tend to export symbols and a program will tend to import symbols: The program will use the symbols exported by the library. There are no strict rules, but a library will tend to export symbols and a program will tend to import symbols: The program will use the symbols exported by the library.
However, at this point in time, none of the supported binary formts support exporting of symbols. However, at this point in time, none of the supported binary formats support exporting of symbols.
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<p> <p>
The <code>load</code> method is used to load the binary format into memory. The <code>load</code> method is used to load the binary format into memory.
It returns either <code>OK</code> (0) meaning that the binary object was loaded successfully, or a negater <code>errno</code> indicating why the object was not loaded. It returns either <code>OK</code> (0) meaning that the binary object was loaded successfully, or a negated <code>errno</code> indicating why the object was not loaded.
</p> </p>
<p> <p>
Documentation/NuttxUserGuide.html
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sched/sched_getscheduler.c
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@@ -129,3 +129,4 @@ int sched_getscheduler(pid_t pid)
return SCHED_FIFO; return SCHED_FIFO;
} }
} }