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1 The Mercurial tree you are looking at is a kit for applying patches to those
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2 parts of TCS211 Calypso GSM firmware that came as binary object libraries
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3 without complete corresponding source.
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4
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5 TI's TCS211 fw build system expects all prebuilt objects (i.e., those which it
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6 should not or cannot recompile from source) to be packaged in libraries (*.lib);
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7 TI's *.lib format is a variant of classic UNIX ar(5) with COFF objects inside.
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8 One can use the standard ar command on a GNU/Linux machine to extract the *.obj
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9 files from TI's *.lib, but I wasn't comfortable with the idea of patching these
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10 *.obj files in their extracted form and then using GNU/Linux version of ar to
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11 repackage them back into *.lib, so instead I wrote a tool that processes a *.lib
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12 archive and applies a specified set of patches to one or more member objects
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13 contained therein.
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14
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15 The libs, gpflibs and oslibs subdirectories contain the set of *.lib files that
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16 constitute our starting point, i.e., the baseline to which patches are to be
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17 applied; the tool subdirectory contains the library patching tool and the
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18 patches subdirectory contains some example patches. The patched libraries
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19 built in the patches directory can then be plopped directly into a TCS211
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20 project tree in the place of the original without any manual splitting or
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21 repackaging.
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22
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23 The leo-obj subtree in the freecalypso-reveng repository contains a specialized
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24 object format parser and disassembler for TI's version of COFF in question, as
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25 well as some already prepared disassembly hints for some parts of the TCS211
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26 binary deliverable we are working with. The present library patching tool
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27 allows one to patch any given byte in any section in any member object in an
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28 archive library; disassembly with tiobjd should be used to figure out which
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29 byte(s) one needs to patch in order to effect the desired change.
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