forked from KolibriOS/kolibrios
ed25f2c1ca
Kernel - removed unnecessary and rewrote/add some comments, no code changes User (lib/dll.obj) - Introduced new KX header as extension for existing formats - Added staring KX header processing - Improved import table test logic, no reason to kill app for import absence - skip import processing (tnx ProMiNick) - Add ReadMe.txt git-svn-id: svn://kolibrios.org@8709 a494cfbc-eb01-0410-851d-a64ba20cac60
105 lines
3.6 KiB
Plaintext
105 lines
3.6 KiB
Plaintext
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---
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History
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0.1 + First realised, kernel load dll.obj at runtime as starting point berfore app startup
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dll.obj process app import table, but not depended librarys, after that app gots control in his starting point
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0.2 + Introduced new KX header as extension for current format (see decription below)
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+ Add KX header processing
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+ Improved import table test logic, no reason to kill app for import absence - skip import processing (tnx ProMiNick)
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---
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Purpose
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Automatically libraries loads and linking imports.
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---
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Limitations
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1) No error messages are issued if the library or symbol in the library is not found or somthing went wrong
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2) There is no autoloading of dependent libraries (the library format needs to be improved, see intorduction of KX header extension bellow)
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---
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How to use
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- in app:
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1) In the version field of a header, (after MENUET0x) you must specify the number 2
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2) After existing header add KX header extension as descriprion bellow
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3) Specify imported libraries. Currentry format of import table same as in case of using dll.Load
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4) Add code, without connecting dll.inc and, accordingly, without calling dll.Load. The heap initialization function (f. 68.11) does not need to be called either.
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5) Compile the app and run. If everything is done correctly, then on startup the debug board will display the message "App header version 2"
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If the DLL.OBJ library is missing, a message will be displayed, incl. via @NOTIFY. If you get a page error make sure you have completed steps 2 and 3
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- in lib (obj):
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Not supported yet, will be realized later.
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1) Field optHeader of COFF header need set in 8+n*4, where n is count of fields after KX header
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2) After COFF header add KX header extension (in general same as in case for app)
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---
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Descriprion of KX header extension (alpha).
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TBD is meaning that this feature to be determined leter, and not supported yet.
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By default all offsets and sizes given in bytes, for Flags field offsets and size given in bits.
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Offset 4.x meaning offset 4 bit x
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Fields between offset 8 and at end of KX header may be added later.
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Offset Size Field Meaning
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Signature:
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0 2 SigMagic Module identifier with the value "KX"
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2 1 SigRevision This field should be 0.
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In the future, it can take on the revision value
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(but can't take values higher than 64)
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3 1 SigArch This field should be 0.
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4 2 Flags:
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4.0 2b F_ImageType TBD, this field should be 0
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4.2 1b F_SectionMode TBD, this field should be 0
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4.3 1b F_Const TBD, this field should be 0
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4.4 1b F_Data TBD, this field should be 0
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4.5 1b F_Export Module has export table, and pointer after header (see below)
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4.6 1b F_Import Module has import table
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4.7 1b F_Reserved Reserved, this field should be 0
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4.8 1b F_BoundImport TBD, this field should be 0
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4.9 1b F_BSS TBD, this field should be 0
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4.10 1b F_TLS TBD, this field should be 0
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1.11 5b F_Reserved Reserved, this field should be 0
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6 2 Reserved Reserved, this field should be 0
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... TBD Fields in this place may be added later
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if(F_Export) {
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? 4 ExportsHeader Pointer to export header (exists if F_Export=1), KX style export table not supported yet. Currently by backward compatibility reason used legacy style of export table, this field pointed to it
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}
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if(F_Import) {
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? 4 ImportsHeader Pointer to imports header (exists if F_Import=1), KX style import table not supported yet. Currently by backward compatibility reason used legacy style of import table, this field pointed to it
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}
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... TBD Fields in this place may be added later
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---
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EOF |