http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=GOFF 2026-05-17T07:47:24Z Revision history for this page on the wiki MediaWiki 1.19.2 http://fileformats.archiveteam.org/index.php?title=GOFF&diff=48142&oldid=prev 2024-03-03T02:02:13Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 02:02, 3 March 2024</td> </tr><tr><td colspan="2" class="diff-lineno">Line 5:</td> <td colspan="2" class="diff-lineno">Line 5:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>''GOFF'' (Generalized Object File Format) is the current executable format for the IBM mainframe operating systems z/OS and z/VM. It supersedes the original [[OS/360 Object File Format]], although the later is still supported.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>''GOFF'' (Generalized Object File Format) is the current executable format for the IBM mainframe operating systems z/OS and z/VM. It supersedes the original [[OS/360 Object File Format]], although the later is still supported.</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">On z/OS, GOFF exists in two subtypes:</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* '''load module''': this is code which can be dynamically loaded into memory – similar in concept to a DLL or shared library on other operating systems. GOFF is the successor to XOBJ, the earlier object format for load modules, which in turn was successor to OBJ</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* '''program object''': this is an executable format</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">=== Program Objects ===</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Note the &quot;program object&quot; format has never been fully and officially documented outside of IBM confidential materials (possibly available under NDA, but certainly not to the general public). That said, significant chunks of it are composed out of data structures which are documented in public z/OS manuals. The biggest missing component is the initial &quot;IEWPLMH&quot; header. However, several of those non-public bits have been revealed in an open source project, an incomplete port of GNU binutils/GDB to z/OS: </ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">There is an [https://github.com/ambitus/binutils incomplete port of GNU binutils to z/OS]. The most important files are [https://github.com/ambitus/binutils/blob/program-object/bfd/po64-s390.c po64-s390.c] and [https://github.com/ambitus/binutils/blob/program-object/include/po/external.h po/external.h]</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The file starts with an 8-byte EBCDIC header (&quot;eyecatcher&quot; in IBM-speak) which is &quot;IEWPLMH&quot; followed by a single EBCDIC space. In hex that is c9c5e6d7d3d4c840.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">z/OS has two main filesystems: the traditional &quot;dataset&quot; filesystem, and a POSIX filesystem (originally HFS, more recently replaced by zFS; also supporting network file systems such as NFS and previously others such as DCE DFS). The traditional filesystem is based on very different concepts from POSIX; instead of files, it has &quot;datasets&quot;, which have explicit record structure (such as fixed vs variable). One type of dataset is known as a &quot;partitioned dataset&quot; (PDS), later also PDSE (Partitioned Data Set Extended), which is like a ZIP file. Anyway, traditional z/OS load modules could not be stored directly in the POSIX filesystem, only in partitioned datasets; you could archive the partitioned dataset into a POSIX file (using utilities such as IEBCOPY and XMIT), but z/OS could not actually use it until it was turned back into a partitioned dataset. By contrast, z/OS Program Objects can be stored in a Unix file directly, as well as in partitioned datasets (which have to be the new PDSE format)</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td></tr> </table>

SJK http://fileformats.archiveteam.org/index.php?title=GOFF&diff=38975&oldid=prev 2021-01-02T12:59:35Z

<p>Created page with &quot;{{FormatInfo |formattype=electronic |subcat=Executables |released=~1995 }} &#039;&#039;GOFF&#039;&#039; (Generalized Object File Format) is the current executable format for the IBM mainframe ope...&quot;</p> <p><b>New page</b></p><div>{{FormatInfo<br /> |formattype=electronic<br /> |subcat=Executables<br /> |released=~1995<br /> }}<br /> ''GOFF'' (Generalized Object File Format) is the current executable format for the IBM mainframe operating systems z/OS and z/VM. It supersedes the original [[OS/360 Object File Format]], although the later is still supported.<br /> <br /> == Links ==<br /> *[[Wikipedia:GOFF|Wikipedia article]]<br /> <br /> [[Category:IBM mainframe]]</div>

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