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Re: function symbols before module base address

From: Roland McGrath <roland at redhat dot com>
To: Mark Wielaard <mjw at redhat dot com>
Cc: systemtap at sourceware dot org
Date: Fri, 20 Feb 2009 13:32:59 -0800 (PST)
Subject: Re: function symbols before module base address
References: <1235053878.2311.53.camel@fedora.wildebeest.org> <20090219225333.064B3FC3DE@magilla.sf.frob.com> <1235135755.2290.39.camel@fedora.wildebeest.org>

> We do filter on STT_FUNC && !SHN_UNDEF.

Ok.

> OK, I'll augment the test to be STT_FUNC && !(SHN_UNDEF || SHN_ABS). The
> combination STT_FUNC && SHN_ABS only seems to occur on older i386
> kernels and covers the vDSO "functions" we were seeing.

Ah.  I've rewritten the vDSO build magic enough times that I can't always
recall what there might have been in past iterations.  I probably never
noticed that the symbols from the old way (using ld -R) copied the symbol
type.  The current method (generating constants in linker scripts) does not.


Thanks,
Roland

References:
- function symbols before module base address
  - From: Mark Wielaard
- Re: function symbols before module base address
  - From: Roland McGrath
- Re: function symbols before module base address
  - From: Mark Wielaard

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