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1.1       root        1: Return-Path: <[email protected]>
                      2: Date: Mon, 10 Apr 89 10:13:45 +0300
                      3: From: Jyrki Kuoppala <[email protected]>
                      4: Sender: [email protected]
                      5: To: [email protected]
                      6: Subject: Kernel fix needed for Altos 3068 to get coff-encapsulation working right
                      7: Organization: Helsinki University of Technology, Finland.
                      8: 
                      9: Here's a description how to fix a kernel bug in Altos 3068 and get
                     10: gcc-compiled programs working.
                     11: 
                     12: Author: Jyrki Kuoppala ([email protected])
                     13: Last modified: Mon Apr 10 09:28:40 1989
                     14: 
                     15: There's a bug in the Altos 3068 kernel that causes gcc-compiled
                     16: programs to fail in certain situations when the machine has a heavy
                     17: load and also in some other situations.  The bug exists at least in
                     18: SVR 2.2 1.0gT1 and SVR 2.2 1.0e.
                     19: 
                     20: If you have source code to your system, apply the following change to
                     21: os/exec.c (function gethead):
                     22: 
                     23: Change the lines containing
                     24: 
                     25:                u.u_exdata.ux_tstart = sizeof(struct naout) +
                     26:                        sizeof(struct filhd) + (ep->ef.nscns * sizeof(struct scnhdr));
                     27: 
                     28: to
                     29: 
                     30:                u.u_exdata.ux_tstart = u.u_exdata.ux_txtorg;
                     31: 
                     32: If you only have binary, use sdb to find out the address of the
                     33: previous lines (on our system it's gethead+0x140) and use your
                     34: favourite binary editor to change the bytes '3036 0162 fffc 0002 0280
                     35: 0000' to '23f9 01fb f4ca 01fb f4c2 6016'.  This may or may not work in
                     36: your case, depending on the version of the operating system and the
                     37: phase of the moon.
                     38: 
                     39: Here's what is just before gethead+0x140 to ease finding out the right place:
                     40: 
                     41: 0x9224 (gethead+0x122):         23f9 01fb f4ca 01fb f4ce mov.l &0x1fbf4ca.L,&0
                     42: x1fbf4ce.L      []
                     43: 0x922e (gethead+0x12c):         23f9 01fb f4c6 01fb f4ca mov.l &0x1fbf4c6.L,&0
                     44: x1fbf4ca.L      []
                     45: 0x9238 (gethead+0x136):         23f9 01fb f4c2 01fb f4c6 mov.l &0x1fbf4c2.L,&0
                     46: x1fbf4c6.L      []
                     47: 
                     48: Good luck !
                     49: 
                     50: //Jyrki
                     51: 
                     52: [email protected]
                     53: 

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