Re: go vs. NetBSD ELF

[christos%zoulas.com@localhost (Christos Zoulas)]

On Nov 1, 11:54pm, kre%munnari.OZ.AU@localhost (Robert Elz) wrote:
-- Subject: Re: go vs. NetBSD ELF

| Is it really rational to keep adding cases for every new note that
| gets discovered (to ignore them), just so that the kernel can print a
| message (and otherwise ignore) notes that it hasn't yet been told
| about ?

It is just for DIAGNOSTIC; production kernels don't print anything.
Now if we want DIAGNOSTIC to print less stuff we can change it to
DEBUG_ELF_NOTES or something.

| Does the message really accomplish anything, other than annoying people?

It makes sure that we don't break our own notes and notifies about new
ones.

| For what it's worth, I see that message from a binary, which readelf
| decodes as ...
| 
| andromeda$ readelf -n ~/bin/cv
| 
| Notes at offset 0x0000010c with length 0x00000034:
|   Owner                 Data size       Description
|   NetBSD        0x00000004      IDENT 199905 (0.0T)
|   NetBSD        0x00000007      Unknown note type: (0x00000002)
| 
| Notes at offset 0x000010ac with length 0x00000050:
|   Owner                 Data size       Description
|   01.01                0x00000000       NT_VERSION (version)
|   01.01                0x00000000       NT_VERSION (version)
|   01.01                0x00000000       NT_VERSION (version)
|   01.01                0x00000000       NT_VERSION (version)
| 
| (I'm pretty that was compiled on at least 1.3, maybe even 1.6 NetBSD,
| I have no idea what 0.0T was!)
| 
| Every time I run it, I get on the console (and in messages) ...
| 
| /home/kre/bin/cv: Unknown elf note type 1 (NetBSD tag): [namesz=8, descsz=0 name=01.01   ]
| 
| The program (continues to) work fine, including running this old 32 bit i386
| binary on an amd64 system, with no particular 32 bit support (other
| than /emul/linux32) added.
| 
| andromeda$ file ~/bin/cv
| /home/kre/bin/cv: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for NetBSD, not stripped

Now I know what it is I can fix it.

christos