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Hello,

On Oct 6, 2007, at 02:49, Allen Wong wrote:

> -> To verify it's the same problem please load the core file into gdb
> -> and disassemble what's at the fault address:
> -> gdb -c whatever.core /path/to/whatever
> -> disassemble 0xwhereveritborked
> ->
> -> If the disassembly dump looks like this:
> -> li r11,something
> -> b somewhere
> -> li r11, somethingelse
> -> b elsewhere
> -> or something like that ( just a long list of loads and branches )
> -> then it's the same problem.
> ->
>
> I don't get anything from gdb:
...
> Program terminated with signal 4, Illegal instruction.
...
> #0  0xeff7cf74 in ?? () from /lib/libc.so.12
> (gdb) disassemble 0xeff7cf74
> No function contains specified address.

Might be a different issue.
Although, a miscached PLT entry doesn't necessarily give a SIGILL  
right away, the cache might contain some valid instruction that could  
do pretty much anything before faulting somewhere. Is the stack valid  
( eg, does the bt command give a useful stack trace? )

> -> >I'll build the userland in a UP kernel tonight and let you know.
> -> >My iMac G3
> -> >has never had this problem and is extremely stable.
> ->
> -> That sounds indeed like the problem I'm talking about.
> ->
>
> A UP kernel builds the userland with no problems.

Yeah, there are probably more cache syncing problems left.

> -> It probably won't work in 4.0, I'll build you one that does.
> ->
>
> Can you please build one for 3.1 as well?  I'm still working on  
> booting 4.0
> on an ide drive.  Thanks!

That might take some time, I need to download the source first. If  
you have the source handy, the patch is small, changes only a handful  
lines in a single file. See attachment.

have fun
Michael


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Index: ppc_reloc.c
===================================================================
RCS file: /cvsroot/src/libexec/ld.elf_so/arch/powerpc/ppc_reloc.c,v
retrieving revision 1.40
diff -u -w -r1.40 ppc_reloc.c
--- ppc_reloc.c	23 May 2006 16:27:41 -0000	1.40
+++ ppc_reloc.c	5 Oct 2007 23:12:00 -0000
@@ -239,7 +239,7 @@
 		 * in _rtld_setup_pltgot() after all the entries have been
 		 * initialized.
 		 */
-		/* __syncicache(where - 3, 12); */
+		__syncicache(where - 3, 12);
 	}
 
 	return 0;
@@ -271,6 +271,7 @@
 		__syncicache(where, 4);
 	} else {
 		Elf_Addr *pltcall, *jmptab;
+		Elf_Word *start = where;
 		int N = obj->pltrelalim - obj->pltrela;
 	
 		/* Entries beyond 8192 take twice as much space. */
@@ -294,7 +295,7 @@
 		/* b	pltcall	*/
 		distance = (Elf_Addr)pltcall - (Elf_Addr)where;
 		*where++ = 0x48000000 | (distance & 0x03fffffc);
-		__syncicache(where - 3, 12);
+		__syncicache(start, 12);
 	}
 
 	if (tp)

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