Prep for 0.4.9
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1969 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
parent
7d37927c61
commit
d9c797730c
@ -773,7 +773,7 @@
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* The NXP LPC2148 and STR711 targets can now also be built using the CodeSourcery
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or devkitARM Windows native toolchains.
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0.4.8 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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0.4.9 2009-06-26 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Add strtoll() and strtoull(); Add macros for atol() and atoll().
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* dup() and dup2() will now clone socket descriptors
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@ -802,6 +802,7 @@
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This file has been around for a long time, but I don't think it has
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every been used before (i.e., prior to the NXFLAT logic)
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0.4.10 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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@ -8,7 +8,7 @@
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<tr align="center" bgcolor="#e4e4e4">
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<td>
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<h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
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<p>Last Updated: June 25, 2009</p>
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<p>Last Updated: June 26, 2009</p>
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</td>
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</tr>
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</table>
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@ -411,6 +411,15 @@
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<li>ROMFS filesystem support.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li><a href="NuttXNxFlat.html">NXFLAT</a>.
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A new binary format call NXFLAT that can be used to
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execute separately linked programs in place in a file system.
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</p>
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</tr>
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<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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@ -687,8 +696,8 @@
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</tr>
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</table>
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<p><b>nuttx-0.4.8</b>.
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This 40<sup>th</sup> release of NuttX (nuttx-0.4.8) was made on June 13, 2009
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<p><b>nuttx-0.4.9</b>.
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This 41<sup>st</sup> release of NuttX (nuttx-0.4.9) was made on June 26, 2009
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and is available for download from the
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<a href="http://sourceforge.net/project/showfiles.php?group_id=189573">SourceForge</a>
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website.
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@ -698,21 +707,16 @@
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</p>
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This release adds:
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<ul>
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<li>
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Support for the Olimex STRP711 board. That board is based on the STMicro
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STR711 MCU (ARM7TDMI). Integration is complete on the basic port (boot logic,
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system time, serial console). Two configurations have been verified: (1) The
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board boots and passes the OS test with console output visible on UART0, and
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the NuttShell (NSH) is fully functional with interrupt driven serial console.
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An SPI driver is available but untested (because the Olimex card slot appears
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to accept only MMC cards; I have only SD cards). Additional needed: USB and
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driver, MMC integration.
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</li>
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<li>
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Support for the CodeSourcery and devkitARM Windows-native GNU toolchains.
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Makefiles have been modified for the LM3S6918, LPC2148, and STR711 to support
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these toolchains under Cygwin.
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</li>
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<li>
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Support for a new binary format call NXFLAT that can be used to
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execute separately linked programs in place in a file system.
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See <a href="NuttXNxFlat.html">NXFLAT Documentation</a>
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for detailed information.
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</li>
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<li>
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Several important bugs were files related to networking and ROMFS
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(see the <a href="#currentrelease">ChangeLog</a> for a complete list).
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</li>
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</ul>
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</p>
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@ -1418,57 +1422,7 @@ Other memory:
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</table>
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<pre><ul>
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nuttx-0.4.8 2009-06-13 Gregory Nutt <spudmonkey@racsa.co.cr>
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* lib/lib_*stream.c: Extend internal stream logic to support incoming streams.
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* arch/arm/src/str71x: Serial output is now correct and timer interrupts are
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working. The test at configs/olimex-strp711/ostest passes. This means that
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the basic STR-P711 port is complete.
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* configs/olimex-strp711/nsh: Add and verifed a NuttShell (NSH) configuration
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for the STR-P711.
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* arch/arm/str71x/str71x_serial.c: The STR711 interrupt driven serial driver
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finally works after some extradinary measures to handle missed interrupts.
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NSH is fully functional on the Olimex STR-P711 board.
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* example/nsh: Moved architecture specific files from NSH directory to board-
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specific directories.
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* config/olimex-strp711/src/up_nsh.c: Add an NSH board specific directory for
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for the Olimex STR7P11 board.
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* Fixed build of LM3X6918 using the CodeSourcery Windows native toolchain. There
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were lots of issues with Cygwin paths and Cygwin symbolic links. These changes
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may work with the devarmKIT as well, but that remains untested.
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* The NXP LPC2148 and STR711 targets can now also be built using the CodeSourcery
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or devkitARM Windows native toolchains.
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pascal-0.1.2 2008-02-10 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Add logic to build and link with the ZDS-II toolchain
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use with the z16f.
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* Make sure that POFF header structures are aligned
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* Standardized POFF file format to big-endian
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* Break up large switch statements to lower complexity
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and eliminate a compiler bug
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* Changes so that runtime compiles with SDCC.
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buildroot-0.1.6 2009-xx-xx <spudmonkey@racsa.co.cr>
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* Added config/arm7tdmi-defconfig-4.2.4
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* Added config/arm920t-defconfig-4.3.3
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* Correct error in arm-defconfig gcc-3.4.6 build. The gcc-3.4.6 configuration
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does not not take --with-abi
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* Correct error in gcc-3.4.6/gcc/collect.c. Calls open with O_CREAT but
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does not specify mode. Newer host compilers can error out on this.
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</pre></ul>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="pendingchanges">Unreleased Changes</a>
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</td>
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</tr>
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</table>
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<pre><ul>
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nuttx-0.4.9 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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nuttx-0.4.9 2009-06-26 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Add strtoll() and strtoull(); Add macros for atol() and atoll().
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* dup() and dup2() will now clone socket descriptors
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@ -1494,9 +1448,17 @@ nuttx-0.4.9 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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This file has been around for a long time, but I don't think it has
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every been used before (i.e., prior to the NXFLAT logic)
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pascal-0.1.3 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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pascal-0.1.2 2008-02-10 Gregory Nutt <spudmonkey@racsa.co.cr>
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buildroot-0.1.7 2009-xx-xx <spudmonkey@racsa.co.cr>
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* Add logic to build and link with the ZDS-II toolchain
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use with the z16f.
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* Make sure that POFF header structures are aligned
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* Standardized POFF file format to big-endian
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* Break up large switch statements to lower complexity
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and eliminate a compiler bug
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* Changes so that runtime compiles with SDCC.
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buildroot-0.1.7 2009-06-26 <spudmonkey@racsa.co.cr>
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* configs/avr-defconfig-4.3.3: Added support for AVR to support a NuttX
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port of the ATmega128.
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@ -1504,6 +1466,24 @@ buildroot-0.1.7 2009-xx-xx <spudmonkey@racsa.co.cr>
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* toolchain/genromfs: Added support for the genromfs tool
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</pre></ul>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="pendingchanges">Unreleased Changes</a>
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</td>
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</tr>
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</table>
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<pre><ul>
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nuttx-0.4.10 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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nuttx-0.4.10 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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pascal-0.1.3 2009-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
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buildroot-0.1.8 2009-xx-xx <spudmonkey@racsa.co.cr>
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</pre></ul>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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@ -1539,6 +1519,10 @@ buildroot-0.1.7 2009-xx-xx <spudmonkey@racsa.co.cr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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<td><a href="NuttShell.html">NuttShell (NSH)</a></td>
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</tr>
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<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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<td><a href="NuttXNxFlat.html">NXFLAT</a> Binary Format</td>
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</tr>
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<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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<td><a href="NXGraphicsSubsystem.html">NX Graphics Subsystem</a></td>
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549
Documentation/NuttXNxFlat.html
Normal file
549
Documentation/NuttXNxFlat.html
Normal file
@ -0,0 +1,549 @@
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<html>
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<head>
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<title>NXFLAT</title>
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</head>
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<body background="backgd.gif">
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<hr><hr>
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<table width ="100%">
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<tr align="center" bgcolor="#e4e4e4">
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||||
<td>
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<h1><big><font color="#3c34ec"><i>NXFLAT</i></font></big></h1>
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<h2><font color="#dc143c">>>> Under Construction <<<</font></h2>
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<p>Last Updated: June 26, 2009</p>
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</td>
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</tr>
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</table>
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<hr><hr>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<h1>Table of Contents</h1>
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</td>
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</tr>
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</table>
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<center><table width ="80%">
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<tr>
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||||
<td>
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||||
<table>
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||||
<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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<td>
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<a href="#overview">1.0 Overview</a>
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</td>
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||||
</tr>
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<tr>
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<td><br></td>
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<td>
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<a href="#functionality">1.1 Functionality</a>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<a href="#background">1.2 Background</a>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<a href="#limitations">1.3 Limitations</a>
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</td>
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</tr>
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<tr>
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<td><br></td>
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||||
<td>
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<a href="#supported">1.4 Supported Processors</a>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<a href="#status">1.5 Development Status</a>
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</td>
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</tr>
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<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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<td>
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<a href="#toolchain">2.0 NXFLAT Toolchain</a>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<a href="#building">1.2 Building the NXFLAT Toolchain</a>
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</td>
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</tr>
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<tr>
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<td><br></td>
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||||
<td>
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<a href="#mknxflat">1.2 mknxflat</a>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<a href="#ldnxflat">1.3 ldnxflat</a>
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</td>
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||||
</tr>
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<tr>
|
||||
<td><br></td>
|
||||
<td>
|
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<a href="#making">1.4 Making an NXFLAT module</a>
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</td>
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</tr>
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<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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<td>
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<a href="#nogot">Appendix A. No GOT Operation</a>
|
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</td>
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</tr>
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<tr>
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<td valign="top" width="22"><img height="20" width="20" src="favicon.ico"></td>
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<td>
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<a href="#pictext">Appendix B. PIC Text Workaround</a>
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</td>
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</tr>
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</table>
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</td>
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||||
</tr>
|
||||
</table></center>
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||||
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<table width ="100%">
|
||||
<tr bgcolor="#e4e4e4">
|
||||
<td>
|
||||
<a name="overview"><h1>1.0 Overview</h1></a>
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</td>
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||||
</tr>
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</table>f
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<a name="functionality"><h2>1.1 Functionality</h2></a>
|
||||
|
||||
<p>
|
||||
NXFLAT is a customized and simplified version of binary format implemented a few years ago called
|
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<a HREF="http://xflat.sourceforge.net/">XFLAT</A>
|
||||
With the NXFLAT binary format you will be able to do the following:
|
||||
</p>
|
||||
<ul>
|
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<li>Place separately linked programs in a file system, and</li>
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<li>Execute those programs by dynamically linking them to the base NuttX code.</li>
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||||
</ul>
|
||||
<p>
|
||||
This allows you to extend the NuttX base code after it has been written into FLASH.
|
||||
One motivation for implementing NXFLAT is support clean CGI under an HTTPD server.
|
||||
</p>
|
||||
<p>
|
||||
This feature is especially attractive when combined with the NuttX ROMFS support:
|
||||
ROMFS allows you to execute programs in place (XIP) in flash without copying anything
|
||||
other than the .data section to RAM.
|
||||
In fact, the initial NXFLAT release will work only on ROMFS.
|
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</p>
|
||||
<p>
|
||||
This NuttX feature includes:
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||||
</p>
|
||||
<ul>
|
||||
<li>
|
||||
A dynamic loader that is built into the NuttX core
|
||||
(See <a href="http://nuttx.cvs.sourceforge.net/viewvc/nuttx/nuttx/binfmt/">CVS</a>).
|
||||
</li>
|
||||
<li>
|
||||
Minor changes to RTOS to support position independent code, and
|
||||
</li>
|
||||
<li>
|
||||
A linker to bind ELF binaries to produce the NXFLAT binary format
|
||||
(See <a href="http://nuttx.cvs.sourceforge.net/viewvc/nuttx/misc/buildroot/toolchain/nxflat">CVS).
|
||||
</li>
|
||||
</ul>
|
||||
|
||||
<a name="background"><h2>1.2 Background</h2></a>
|
||||
|
||||
<p>
|
||||
NXFLAT is derived from <a href="http://xflat.sourceforge.net/">XFLAT</a>.
|
||||
XFLAT is a toolchain add that provides full shared library and XIP executable
|
||||
support for processors that have no Memory Management Unit (MMU).
|
||||
NXFLAT is greatly simplified for the deeply embedded environment targeted by Nuttx:
|
||||
</p>
|
||||
<ul>
|
||||
<li>NXFLAT does not support shared libraries, because</li>
|
||||
<li>NXFLAT does not support <i>exportation</i> of symbol values from a module</li>
|
||||
</ul>
|
||||
<p>
|
||||
Rather, the NXFLAT module only <i>imports</i> symbol values.
|
||||
In the NXFLAT model, the (PIC<sup>1</sup>) NXFLAT module resides in a FLASH file system and
|
||||
when it is loaded at run time, it is dynamically linked only to the (non-PIC) base NuttX
|
||||
code:
|
||||
The base NuttX <i>exports</i> a symbol table; the NXFLAT module <i>imports</i> those symbol value
|
||||
to dynamically bind the module to the base code.
|
||||
</p>
|
||||
<p><sup>1</sup><small>"Position Independent Code"</small></p>
|
||||
|
||||
<a name="limitations"><h2>1.3 Limitations</h2></a>
|
||||
|
||||
<ul>
|
||||
<li><b>ROMFS Only</b>.
|
||||
The initial NXFLAT release will work only with executable modules residing on a ROMFS
|
||||
file system.
|
||||
That is because the loader depends on the capability to <code>mmap()</code> the code segment.
|
||||
NUTTX does not provide any general kind of file mapping capability.
|
||||
In fact, <i>true </i>file mapping is only possible with RTOSs and MCUs that provide an MMU<sup>1</sup>
|
||||
and only ROMFS supports that kind of XIP execution from FLASH.
|
||||
It is possible to simulate file mapping by allocating memory and copy the file into memory.
|
||||
NXFLAT would work that kind of file mapping to and that feature could easily be added to NuttX.
|
||||
</li>
|
||||
<li><b>GCC/ARM/Cortex-M3 Only</b>
|
||||
At present, the NXFLAT toolchain is only available for ARM and Cortex-M3 (thumb2) targets.
|
||||
</li>
|
||||
<li><b>Read-Only Data in RAM</b>
|
||||
Read-only data must reside in RAM.
|
||||
In code generated by GCC, all data references are indexed by the PIC<sup>2</sup> base register
|
||||
(that is usually R10 or <i>sl</i> for the ARM processors).
|
||||
The includes read-only data (<code>.rodata</code>).
|
||||
Embedded firmware developers normally like to keep <code>.rodata</code> in FLASH with the code sections.
|
||||
But because all data is referenced with the PIC base register, all of that data must lie in RAM.
|
||||
A NXFLAT change to work around this is under investigation<sup>3</sup>.
|
||||
</li>
|
||||
<li><b>Globally Scoped Function Function Pointers</b>
|
||||
If a function pointer is taken to a statically defined function, then (at least for ARM) GCC will
|
||||
generate a relocation that NXFLAT cannot handle.
|
||||
The workaround is make all such functions global in scope.
|
||||
A fix would involve a change to the GCC compiler as described in <a href="#pictext">Appendix B</a>.
|
||||
</li>
|
||||
<li><b>No Callbacks</b>
|
||||
Callbacks through function pointers must be avoided or, when then cannot be avoided, handled very specially.
|
||||
The reason for this is that the PIC module requires setting of a special value in a PIC register.
|
||||
If the callback does not set the PIC register, then the called back function will fail because
|
||||
it will be unable to correct access data memory.
|
||||
Special logic is in place to handle: Signal callbacks, watchdog timer callbacks.
|
||||
But other callbacks (like those used with <code>qsort()</code> must be avoided in an NXFLAT module.
|
||||
</li>
|
||||
</ul>
|
||||
|
||||
<ul><p>
|
||||
<sup>1</sup><small>"Memory Management Unit"</small><br>
|
||||
<sup>2</sup><small>"Position Independent Code"</small><br>
|
||||
<sup>3</sup><small>A work around is under consideration:
|
||||
At run time, the <code>.rodata</code> offsets will be indexed by a RAM address.
|
||||
If the dynamic loader were to offset those <code>.rodata</code> offsets properly, it
|
||||
still might be possible to reference <code>.rodata</code> in ROM.
|
||||
That work around is still a top of investigation at this time.</small>
|
||||
</p></ul>
|
||||
|
||||
<a name="supported"><h2>1.4 Supported Processors</h2></a>
|
||||
|
||||
<p>
|
||||
As mentioned <a href="#limitations">above</a>, the NXFLAT toolchain is only available for ARM and
|
||||
Cortex-M3 (thumb2) targets.
|
||||
Furthermore, NXFLAT has only been tested on the Eagle-100 LMS6918 Cortex-M3 board.
|
||||
</p>
|
||||
|
||||
<a name="status"><h2>1.5 Development Status</h2></a>
|
||||
|
||||
<p>
|
||||
The initial release of NXFLAT was made in NuttX version 0.4.9.
|
||||
Testing is limited to the tests found under <code>examples/nxflat</code> in the source tree.
|
||||
Some known problems exist
|
||||
(see the <a href="http://nuttx.cvs.sourceforge.net/*checkout*/nuttx/nuttx/TODO">TODO</a> list).
|
||||
As such, NXFLAT is currently in an early alpha phase.
|
||||
</p>
|
||||
|
||||
<table width ="100%">
|
||||
<tr bgcolor="#e4e4e4">
|
||||
<td>
|
||||
<a name="toolchain"><h1>2.0 NXFLAT Toolchain</h1></a>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<a name="building"><h2>1.2 Building the NXFLAT Toolchain</h2></a>
|
||||
|
||||
<p>
|
||||
In order to use NXFLAT, you must use special NXFLAT tools to create the binary module in FLASH.
|
||||
To do this, you will need to download the buildroot package and build it on your Linux or Cygwin machine.
|
||||
The buildroot can be downloaded from
|
||||
<a https://sourceforge.net/project/showfiles.php?group_id=189573&package_id=224585">Sourceforge</a>.
|
||||
You will need version 0.1.7 or later.
|
||||
</p>
|
||||
<p>
|
||||
Here are some general build instructions:
|
||||
</p>
|
||||
<ul>
|
||||
|
||||
<li>
|
||||
You must have already configured Nuttx in <code><some-dir>/nuttx</code>
|
||||
<li>
|
||||
<li>
|
||||
Download the buildroot package <code>buildroot-0.x.y</code> into <code><some-dir></code>
|
||||
<li>
|
||||
<li>
|
||||
Unpack <code><some-dir>/buildroot-0.x.y.tar.gz</code> using a command like <code>tar zxf buildroot-0.x.y</code>.
|
||||
This will result in a new directory like <code><some-dir>/misc/buildroot-0.x.y</code>
|
||||
</li>
|
||||
<li>
|
||||
Move this into position: <code>mv <some-dir>/misc/buildroot-0.x.y <code><some-dir>/buildroot</code>
|
||||
</li>
|
||||
<li>
|
||||
<code>cd <code><some-dir>/buildroot</code>
|
||||
</li>
|
||||
<li>
|
||||
Copy a configuration file into the top buildroot directory: <code>cp configs/abc-defconfig-x.y.z .config</code>.
|
||||
</li>
|
||||
<li>
|
||||
Enable building of the NXFLAT tools by <code>make menuconfig</code>.
|
||||
Select to build the NXFLAT toolchain with GCC (you can also select omit building GCC with and only build the
|
||||
NXFLAT toolchain for use with your own GCC toolchain).
|
||||
</li>
|
||||
<li>
|
||||
Make the toolchain: <code>make</code>.
|
||||
When the make completes, the tool binaries will be available under
|
||||
<code><some-dir>/buildroot/build_abc/staging_dir/bin</code>
|
||||
</li>
|
||||
</ul>
|
||||
|
||||
<a name="mknxflat"><h2>1.2 mknxflat</h2></a>
|
||||
|
||||
<p>
|
||||
<code>mknxflat</code> is used to build a <i>thunk</i> file.
|
||||
See <a href="#making">below</a> for usage.
|
||||
|
||||
<ul><pre>
|
||||
Usage: mknxflat [options] <bfd-filename>
|
||||
|
||||
Where options are one or more of the following. Note
|
||||
that a space is always required between the option and
|
||||
any following arguments.
|
||||
|
||||
-d Use dynamic symbol table. [symtab]
|
||||
-f <cmd-filename>
|
||||
Take next commands from <cmd-filename> [cmd-line]
|
||||
-o <out-filename>
|
||||
Output to <out-filename> [stdout]
|
||||
-v Verbose output [no output]
|
||||
-w Import weakly declared functions, i.e., weakly
|
||||
declared functions are expected to be provided at
|
||||
load-time [not imported]
|
||||
</pre></ul>
|
||||
|
||||
<a name="ldnxflat"><h2>1.3 ldnxflat</h2></a>
|
||||
|
||||
<p>
|
||||
<code>ldnxflat</code> is use to link your object files along with the <i>thunk</i> file
|
||||
generated by <a href="#mknxflat"><code>mknxflat<code></a> to produce the NXFLAT binary module.
|
||||
See <a href="#making">below</a> for usage.
|
||||
</p>
|
||||
|
||||
<ul><pre>
|
||||
Usage: ldnxflat [options] <bfd-filename>
|
||||
|
||||
Where options are one or more of the following. Note
|
||||
that a space is always required between the option and
|
||||
any following arguments.
|
||||
|
||||
-d Use dynamic symbol table [Default: symtab]
|
||||
-e <entry-point>
|
||||
Entry point to module [Default: _start]
|
||||
-o <out-filename>
|
||||
Output to <out-filename> [Default: <bfd-filename>.nxf]
|
||||
-s <stack-size>
|
||||
Set stack size to <stack-size> [Default: 4096]
|
||||
-v Verbose output. If -v is applied twice, additional
|
||||
debug output is enabled [Default: no verbose output].
|
||||
</pre></ul>
|
||||
|
||||
<a name="making"><h2>1.4 Making an NXFLAT module</h2></a>
|
||||
|
||||
<p>
|
||||
Below is a snippet from an NXFLAT make file (simplified from NuttX
|
||||
<a href="http://nuttx.cvs.sourceforge.net/viewvc/*checkout*/nuttx/nuttx/examples/nxflat/tests/hello/Makefile?revision=1.6">
|
||||
Hello, World!</a> example.
|
||||
<p>
|
||||
<ul><table width="50%">
|
||||
|
||||
<ul><table>
|
||||
<tr>
|
||||
<th>Target 1</th>
|
||||
<td><code>hello.r1:</code></td>
|
||||
<td><code>hello.o</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><br></td>
|
||||
<td><br></td>
|
||||
<td><code>abc-elf-ld -r -d -warn-common -o $@ $^</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<th>Target 2</th>
|
||||
<td><code>hello-thunk.S:</code></td>
|
||||
<td><code>hello.r1</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><br></td>
|
||||
<td><br></td>
|
||||
<td><code>mknxflat -o $@ $^</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<th>Target 3</th>
|
||||
<td><code>hello.r2:</code></td>
|
||||
<td><code>hello-thunk.S</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><br></td>
|
||||
<td><br></td>
|
||||
<td>
|
||||
<code>abc-elf-ld -r -d -warn-common -T binfmt/libnxflat/gnu-nxflat.ld -no-check-sections -o $@ hello.o hello-thunk.o</code>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<th>Target 4</th>
|
||||
<td><code>hello:</code></td>
|
||||
<td><code>hello.r2</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><br></td>
|
||||
<td><br></td>
|
||||
<td><code>ldnxflat -e main -s 2048 -o $@ $^</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
</table></ul>
|
||||
|
||||
<p><b>Target 1</b>.
|
||||
This target links all of the object files together into one relocation object.
|
||||
In this case, there is only a single object file, <code>hello.o</code>, and it is linked to produce <code>hello.r1</code>.
|
||||
</p>
|
||||
|
||||
<p><b>Target 2</b>.
|
||||
Given <code>hello.r1</code>, this target will invoke <a href="#mknxflat"><code>mknxflat</code></a>
|
||||
to make the <i>thunk</i> file, <code>hello-thunk.S</code>.
|
||||
This <i>thunk</i> contains all of the information needed to create the imported function list.
|
||||
</p>
|
||||
|
||||
<p><b>Target 3</b>
|
||||
This this target is similar to <b>Target 1</b>.
|
||||
In this case, it will link together the object file, <code>hello.o</code> along with the assembled <i>thunk</i> file,
|
||||
<code>hello-thunk.o</code> to create another, single relocatable object, <code>hello.r2</code>.
|
||||
The linker script, <code>gnu-nxflat.ld</code> is required at this point to correctly position the sections.
|
||||
</p>
|
||||
|
||||
<p><b>Target 4</b>.
|
||||
Finally, this target will use the <code>hello.r2</code> relocatable object to create the final, NXFLAT module
|
||||
<code>hello</code> by calling <a href="#ldnxflat"><code>ldnxflat</code></a>.
|
||||
</p>
|
||||
|
||||
<table width ="100%">
|
||||
<tr bgcolor="#e4e4e4">
|
||||
<td>
|
||||
<a name="nogot"><h1>Appendix A. No GOT Operation</h1></a>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>
|
||||
When GCC generate position independent code, new code sections will appear in your programs.
|
||||
One of these the the GOT (Global Offset Table) and, in ELF environments, the PLT (Procedure
|
||||
Lookup Table.
|
||||
For example, if your C code generated (ARM) assembly language like this without PIC:
|
||||
<p>
|
||||
<ul><pre>
|
||||
ldr r1, .L0 <-- Fetch the offset to 'x'
|
||||
ldr r0, [r10, r1] <-- Load the value of 'x' with PIC
|
||||
offset
|
||||
...
|
||||
.L0: .word x <-- Offset to 'x'
|
||||
</pre></ul>
|
||||
|
||||
<p>
|
||||
Then when PIC is enabled (say with the -fpic compiler option), it will generate code like
|
||||
this:
|
||||
</p>
|
||||
|
||||
<ul><pre>
|
||||
ldr r1, .L0 <-- Fetch the offset to the GOT entry
|
||||
ldr r1, [r10,r1] <-- Fetch the (relocated) address
|
||||
of 'x' from the GOT
|
||||
ldr r0, [r1, #0] <-- Fetch the value of 'x'
|
||||
...
|
||||
.L1 .word x(GOT) <-- Offset to entry in the GOT
|
||||
</pre></ul>
|
||||
|
||||
<p>See <a href="http://xflat.sourceforge.net/NoMMUSharedLibs.html#shlibsgot">reference</a></p>
|
||||
|
||||
<p>
|
||||
Notice that the generates an extra level of indirection through the GOT.
|
||||
This indirection is not needed by NXFLAT and only adds more RAM usage and
|
||||
execution time.
|
||||
</p>
|
||||
<p>
|
||||
NXFLAT (like <a href="http://xflat.sourceforge.net/">XFLAT</a>) can work even better with
|
||||
the GOT.
|
||||
Patches again older version of GCC exist to eliminate the GOT indirections.
|
||||
Several are available <a href="http://xflat.cvs.sourceforge.net/viewvc/xflat/xflat/gcc/">here</a>
|
||||
if you are inspired to port them to a new GCC version.
|
||||
</p>
|
||||
|
||||
|
||||
<table width ="100%">
|
||||
<tr bgcolor="#e4e4e4">
|
||||
<td>
|
||||
<a name="pictext"><h1>Appendix B. PIC Text Workaround</h1></a>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<p>
|
||||
There is a problem with the memory model in GCC that prevents it from
|
||||
being used as you need to use it in the NXFLAT context.
|
||||
The problem is that GCC PIC model assumes that the executable lies in a flat, contiguous (virtual) address space like:
|
||||
<p>
|
||||
<ul><table width="15%">
|
||||
<tr><th>Virtual</th></td>
|
||||
<tr>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.text</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.got</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.data</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.bss</code></td>
|
||||
</tr>
|
||||
</table></ul>
|
||||
<p>
|
||||
It assumes that the PIC base register (usually r10 for ARM) points to the base of <code>.text</code>
|
||||
so that any address in <code>.text</code>, <code>.got</code>, <code>.data</code>, <code>.bss</code>
|
||||
can be found with an offset from the same base address.
|
||||
But that is not the memory arrangement that we need in the XIP embedded environment.
|
||||
We need two memory regions, one in FLASH containing shared code and on per task in RAM containing task-specific data:
|
||||
</p>
|
||||
|
||||
<ul><table width="30%">
|
||||
<tr><th>Flash</th><th>RAM</th></td>
|
||||
<tr>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.text</code></td>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.got</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td bgcolor="#e4e4e4"><br></td>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.data</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td bgcolor="#e4e4e4"><br></td>
|
||||
<td align="center" bgcolor="#e4e4e4"><code>.bss</code></td>
|
||||
</tr>
|
||||
</table></ul>
|
||||
|
||||
<p>
|
||||
The PIC base register needs to point to the base of the <code>.got</code> and only
|
||||
addresses in the <code>.got</code>, <code>.data</code>, and <code>.bss</code>
|
||||
sections can be accessed as an offset from the PIC base register.
|
||||
See also this
|
||||
<a href="http://xflat.cvs.sourceforge.net/viewvc/*checkout*/xflat/xflat/gcc/README?revision=1.1.1.1">XFLAT discussion</a>.
|
||||
</p>
|
||||
<p>
|
||||
Patches again older version of GCC exist to correct this GCC behavior.
|
||||
Several are available <a href="http://xflat.cvs.sourceforge.net/viewvc/xflat/xflat/gcc/">here</a>
|
||||
if you are inspired to port them to a new GCC version.
|
||||
</p>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
14
ReleaseNotes
14
ReleaseNotes
@ -923,3 +923,17 @@ This is the 40th release of NuttX. This release adds:
|
||||
|
||||
This tarball contains a complete CVS snapshot from June 13, 2009.
|
||||
|
||||
nuttx-0.4.9
|
||||
^^^^^^^^^^^
|
||||
|
||||
This is the 41st release of NuttX. This release adds:
|
||||
|
||||
* Support for a new binary format call NXFLAT that can be used to
|
||||
execute separately linked programs in place in a file system.
|
||||
See http://www.nuttx.org/NuttXNxFlat.html.
|
||||
|
||||
* Several important bugs were files related to networking and ROMFS
|
||||
(see the ChangeLog for a complete list).
|
||||
|
||||
This tarball contains a complete CVS snapshot from June 26, 2009.
|
||||
|
||||
|
||||
48
TODO
48
TODO
@ -1,4 +1,4 @@
|
||||
NuttX TODO List (Last updated June 19, 2009)
|
||||
NuttX TODO List (Last updated June 26, 2009)
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
(5) Task/Scheduler (sched/)
|
||||
@ -6,15 +6,16 @@ NuttX TODO List (Last updated June 19, 2009)
|
||||
(1) Signals (sched/, arch/)
|
||||
(1) pthreads (sched/)
|
||||
(1) C++ Support
|
||||
(5) Binary loaders (binfmt/)
|
||||
(12) Network (net/, netutils/)
|
||||
(1) USB (drivers/usbdev)
|
||||
(4) Libraries (lib/)
|
||||
(8) File system/Generic drivers (fs/, drivers/)
|
||||
(2) Graphics subystem (graphics/)
|
||||
(1) Pascal add-on (pcode/)
|
||||
(0) Documentation (Documentation/)
|
||||
(2) Documentation (Documentation/)
|
||||
(6) Build system / Toolchains
|
||||
(2) NuttShell (NSH) (examples/nsh)
|
||||
(3) NuttShell (NSH) (examples/nsh)
|
||||
(3) Other Applications & Tests (examples/)
|
||||
(2) Linux/Cywgin simulation (arch/sim)
|
||||
(3) ARM (arch/arm/)
|
||||
@ -102,6 +103,39 @@ o C++ Support
|
||||
constructor logic will probably have to be performed by
|
||||
user logic in user_start().
|
||||
|
||||
o Binary loaders (binfmt/)
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
Description: Not all of the NXFLAT test under examples/nxflat are working.
|
||||
Most simply do not compile yet. tests/mutex runs okay but
|
||||
outputs garbage on completion.
|
||||
Status: Open
|
||||
Priority: High
|
||||
|
||||
Description: The ARM up_getpicbase() does not seem to work. This means
|
||||
the some features like wdog's might not work in NXFLAT modules.
|
||||
Status: Open
|
||||
Priority: Medium-High
|
||||
|
||||
Description: At present, all .rodata must be put into RAM. There is a
|
||||
tentative design change that might allow .rodata to be placed
|
||||
in FLASH (see Documentation/NuttXNxFlat.html).
|
||||
Status: Open
|
||||
Priority: Medium
|
||||
|
||||
Description: If the function pointer to a statically defined function is
|
||||
taken, then GCC generates a relocation that cannot be handled
|
||||
by NXFLAT. There is a solution described in Documentataion/NuttXNxFlat.html,
|
||||
by that would require a compiler change (which we want to avoid).
|
||||
The simple workaround is to make such functions global in scope.
|
||||
Status: Open
|
||||
Priority: Low (probably will not fix)
|
||||
|
||||
Description: In the NXFLAT symbol tables... Using a 32-bit hash value instead
|
||||
of a string to identify a symbol should result in a smaller footprint.
|
||||
Status: Open
|
||||
Priority: Low
|
||||
|
||||
o Network (net/, netutils/)
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
@ -325,6 +359,10 @@ o Documentation (Documentation/)
|
||||
Status: Open
|
||||
Priority: Low
|
||||
|
||||
Description: Need to document binary loader APIs
|
||||
Status: Open
|
||||
Priority: Low
|
||||
|
||||
o Build system
|
||||
^^^^^^^^^^^^
|
||||
|
||||
@ -378,6 +416,10 @@ o NuttShell (NSH) (examples/nsh)
|
||||
Status: Open
|
||||
Priority: Med-High
|
||||
|
||||
Description: Add support to NSH to run NXFLAT programs from a ROMFS file system
|
||||
Status: Open
|
||||
Priority: Low
|
||||
|
||||
o Other Applications & Tests (examples/)
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
|
||||
@ -143,7 +143,7 @@ examples/nxflat
|
||||
This example builds a small NXFLAT test case. This includes several
|
||||
test programs under examples/nxflat tests. These tests are build using
|
||||
the NXFLAT format and installed in a ROMFS file system. At run time,
|
||||
each program int eh ROMFS file system is executed.
|
||||
each program in the ROMFS file system is executed. Requires CONFIG_NXFLAT.
|
||||
|
||||
examples/null
|
||||
^^^^^^^^^^^^^
|
||||
|
||||
Loading…
Reference in New Issue
Block a user