ELF .note BSD_SYMTAB

ELF .note BSD_SYMTAB

[Ryan O'Neill]

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Hello. After reading through some of the libelf-loader.c and
libelf-dominfo.c code, it appears that Xen expects BSD guest kernels
to have an ELF .note auxillary entry of type XEN_ELFNOTE_BSD_SYMTAB
that gets parsed in so that Xen knows to allocate room for the kernels
symbol table. I do not see this Note (Or any note segment/section) in
my freebsd guest kernel image (readelf -n). Can someone explain to me
if this Note is still used? If so, then in what case?

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Re: ELF .note BSD_SYMTAB

[Andrew Cooper]

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On 06/08/2014 20:24, Ryan O'Neill wrote:
> Hello. After reading through some of the libelf-loader.c and
> libelf-dominfo.c code, it appears that Xen expects BSD guest kernels
> to have an ELF .note auxillary entry of type XEN_ELFNOTE_BSD_SYMTAB
> that gets parsed in so that Xen knows to allocate room for the kernels
> symbol table. I do not see this Note (Or any note segment/section) in
> my freebsd guest kernel image (readelf -n). Can someone explain to me
> if this Note is still used? If so, then in what case?
>

There is no expectation persay.  Merely alternative actions taken if found.

I seem to recall (or I might be completely confused), it is a somewhat
legacy NetBSDism, so I would not be at all surprised if modern FreeBSD
doesn't use it.

~Andrew

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Re: ELF .note BSD_SYMTAB

[Egger, Christoph]

On 06.08.14 21:31, Andrew Cooper wrote:
> On 06/08/2014 20:24, Ryan O'Neill wrote:
>> Hello. After reading through some of the libelf-loader.c and
>> libelf-dominfo.c code, it appears that Xen expects BSD guest kernels
>> to have an ELF .note auxillary entry of type XEN_ELFNOTE_BSD_SYMTAB
>> that gets parsed in so that Xen knows to allocate room for the kernels
>> symbol table. I do not see this Note (Or any note segment/section) in
>> my freebsd guest kernel image (readelf -n). Can someone explain to me
>> if this Note is still used? If so, then in what case?
>>
> 
> There is no expectation persay.  Merely alternative actions taken if found.
> 
> I seem to recall (or I might be completely confused), it is a somewhat
> legacy NetBSDism, so I would not be at all surprised if modern FreeBSD
> doesn't use it.

I recommend to add port-xen@netbsd.org to this thread to get NetBSD
people in.

Christoph