Hi,

Small transcript saved:

On Wed, 2007-08-08 at 09:23 -0400, Andrew Cagney wrote:
> - frysk-asm.h walk through

We wnet over the folliwing files:
$ less frysk-core/frysk/pkglibdir/funit-frameless.S 
$ less frysk-imports/include/funit-util.h 
$ less frysk-imports/include/frysk-asm.h 
$ less frysk-imports/include/frysk-asm.h 
$ less frysk-core/frysk/pkglibdir/funit-symbols.S 

The frysk-asm.h files has lots and lots of comments.

$ info gas
Will give you documentation on the .cif assembler directives used.
* Pseudo Ops::                  Assembler Directives
* CFI directives::              `.cfi_startproc', `.cfi_endproc', etc.
http://sourceware.org/binutils/docs-2.17/as/CFI-directives.html
(I must have missed this before, because I was looking for it, but only
found the gas 2.9 manual online previously, which doesn't seem to
support the cfi directives.)

> - C++ types

Stan was smart and had a premade demo, which is attached.

> - more debuginfo

$ ./frysk-core/frysk/bindir/fhpd $$
Attached to process 5784
(fhpd) de

debuginfo    defset       delete       detach
(fhpd) debuginfo 
/lib/libnss_files-2.6.so /usr/lib/debug/lib/libnss_files-2.6.so.debug
/lib/ld-2.6.so /usr/lib/debug/lib/ld-2.6.so.debug
/lib/libc-2.6.so /usr/lib/debug/lib/libc-2.6.so.debug
/lib/libdl-2.6.so /usr/lib/debug/lib/libdl-2.6.so.debug
/lib/libtinfo.so.5.6 /usr/lib/debug/lib/libtinfo.so.5.6.debug
/bin/bash /usr/lib/debug/bin/bash.debug

(fhpd) quit
Quitting...

$ ./frysk/bindir/fdebuginfo $$
/lib/libnss_files-2.6.so /usr/lib/debug/lib/libnss_files-2.6.so.debug
/lib/ld-2.6.so /usr/lib/debug/lib/ld-2.6.so.debug
/lib/libc-2.6.so /usr/lib/debug/lib/libc-2.6.so.debug
/lib/libdl-2.6.so /usr/lib/debug/lib/libdl-2.6.so.debug
/lib/libtinfo.so.5.6 /usr/lib/debug/lib/libtinfo.so.5.6.debug
/bin/bash /usr/lib/debug/bin/bash.debug

$ ./frysk/bindir/fcore $$

$ ./frysk/bindir/fdebuginfo core.$$
Exception in thread "main" java.lang.StringIndexOutOfBoundsException:
String ind
ex out of range: 0
   at java.lang.String.charAt(libgcj.so.8rh)
   at frysk.util.DebuginfoPaths.getDebuginfo(fdebuginfo)
   at frysk.bindir.fdebuginfo.printDebuginfo(fdebuginfo)
   at frysk.bindir.fdebuginfo.access$0(fdebuginfo)
   at frysk.bindir.fdebuginfo$1.parseCores(fdebuginfo)
   at frysk.util.CommandlineParser.doParse(fdebuginfo)
   at frysk.util.CommandlineParser.parse(fdebuginfo)
   at frysk.bindir.fdebuginfo.main(fdebuginfo)

[... bah! That is no good. After some debugging we came up with ...]

$ cvs diff frysk-core/frysk/util
Index: frysk-core/frysk/util/DebuginfoPaths.java
===================================================================
RCS file: /cvs/frysk/frysk-core/frysk/util/DebuginfoPaths.java,v
retrieving revision 1.1
diff -u -r1.1 DebuginfoPaths.java
--- frysk-core/frysk/util/DebuginfoPaths.java   7 Aug 2007 15:26:24 -0000      1.1
+++ frysk-core/frysk/util/DebuginfoPaths.java   8 Aug 2007 14:49:32 -0000
@@ -77,7 +77,7 @@
         String name = mod.getName();
         
         // Check for valid executables
-        if (name.charAt(0)=='/')
+        if (name.length() != 0 && name.charAt(0)=='/')
           {              
             // Ignore non-binary modules
             if (mod.getElf()==null)  

$ ./frysk/bindir/fdebuginfo core.$$
/lib/ld-linux.so.2 /usr/lib/debug/lib/ld-2.6.so.debug
/lib/libc.so.6 /usr/lib/debug/lib/libc-2.6.so.debug
/lib/libdl.so.2 /usr/lib/debug/lib/libdl-2.6.so.debug
/lib/libtinfo.so.5 /usr/lib/debug/lib/libtinfo.so.5.6.debug
/bin/bash /usr/lib/debug/bin/bash.debug

[... But this is slightly strange, needs investigation, why is the name
 empty in the first place?  Phil and Mark think it might be the vdso
 module name ...]

$ uname  -a
Linux hermans.wildebeest.org 2.6.22.1-41.fc7 #1 SMP Fri Jul 27 18:10:34 EDT 2007 i686 i686 i386 GNU/Linux

$ grep vdso /proc/$$/maps
00110000-00111000 r-xp 00110000 00:00 0          [vdso]