source: trunk/third/gcc/README.ALTOS @ 8834

Revision 8834, 1.8 KB checked in by ghudson, 28 years ago (diff)
This commit was generated by cvs2svn to compensate for changes in r8833, which included commits to RCS files with non-trunk default branches.
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1Since COFF-encapsulation is obsolete, this may not be needed anymore.
2
3Return-Path: <jkp@sauna.hut.fi>
4Date: Mon, 10 Apr 89 10:13:45 +0300
5From: Jyrki Kuoppala <jkp@sauna.hut.fi>
6Sender: jkp@sauna.hut.fi
7To: info-gcc@prep.ai.mit.edu
8Subject: Kernel fix needed for Altos 3068 to get coff-encapsulation working right
9Organization: Helsinki University of Technology, Finland.
10
11Here's a description how to fix a kernel bug in Altos 3068 and get
12gcc-compiled programs working.
13
14Author: Jyrki Kuoppala (jkp@cs.hut.fi)
15Last modified: Mon Apr 10 09:28:40 1989
16
17There's a bug in the Altos 3068 kernel that causes gcc-compiled
18programs to fail in certain situations when the machine has a heavy
19load and also in some other situations.  The bug exists at least in
20SVR 2.2 1.0gT1 and SVR 2.2 1.0e.
21
22If you have source code to your system, apply the following change to
23os/exec.c (function gethead):
24
25Change the lines containing
26
27                u.u_exdata.ux_tstart = sizeof(struct naout) +
28                        sizeof(struct filhd) + (ep->ef.nscns * sizeof(struct scnhdr));
29
30to
31
32                u.u_exdata.ux_tstart = u.u_exdata.ux_txtorg;
33
34If you only have binary, use sdb to find out the address of the
35previous lines (on our system it's gethead+0x140) and use your
36favourite binary editor to change the bytes '3036 0162 fffc 0002 0280
370000' to '23f9 01fb f4ca 01fb f4c2 6016'.  This may or may not work in
38your case, depending on the version of the operating system and the
39phase of the moon.
40
41Here's what is just before gethead+0x140 to ease finding out the right place:
42
430x9224 (gethead+0x122):         23f9 01fb f4ca 01fb f4ce mov.l &0x1fbf4ca.L,&0
44x1fbf4ce.L      []
450x922e (gethead+0x12c):         23f9 01fb f4c6 01fb f4ca mov.l &0x1fbf4c6.L,&0
46x1fbf4ca.L      []
470x9238 (gethead+0x136):         23f9 01fb f4c2 01fb f4c6 mov.l &0x1fbf4c2.L,&0
48x1fbf4c6.L      []
49
50Good luck !
51
52//Jyrki
53
54jkp@cs.hut.fi
55
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