Date: Fri, 23 Feb 2007 17:47:40 +0800 From: Mayank Kumar <mayank@microsoft.com> To: Dan Nelson <dnelson@allantgroup.com>, Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: RE: what does _eprol mean and how is it compututed Message-ID: <76EBE649FB0E0E4DA883B5840459059F143A1828E9@AA-EXMSG-C412.southpacific.corp.microsoft.com> In-Reply-To: <20070223054321.GB43770@dan.emsphone.com> References: <76EBE649FB0E0E4DA883B5840459059F143A182705@AA-EXMSG-C412.southpacific.corp.microsoft.com> <20070223010358.GA4946@kobe.laptop> <20070223054321.GB43770@dan.emsphone.com>
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Hi Dan,
Cool, thnks for the information. That's exactly what I was looking for. But the cvs webaccess shows me crt0.c which actually contains _eprol and _etext. Anyways I now understand what eprol means.
Thanks
Mayank
-----Original Message-----
From: Dan Nelson [mailto:dnelson@allantgroup.com]
Sent: Friday, February 23, 2007 11:13 AM
To: Giorgos Keramidas
Cc: Mayank Kumar; freebsd-current@freebsd.org
Subject: Re: what does _eprol mean and how is it compututed
In the last episode (Feb 23), Giorgos Keramidas said:
> On 2007-02-22 04:20, Mayank Kumar <mayank@microsoft.com> wrote:
> > While calling monstartup in crt0.c, _eprol and _etext are passed to
> > monstartup. _etext means end of segment, what does _eprol mean and
> > how is it computed
>
> Are you sure you are talking about FreeBSD?
>
> build@kobe:/home/build/src$ egrep -r -e '_eprol|_etext' *
> build@kobe:/home/build/src$
>
> I don't see any reference to '_eprol' or '_etext' in our source tree,
> and 'monstartup' doesn't really ring any bells.
It's actually "eprol" and "etext", and the source file is crt1.c,
located at /usr/src/lib/csu/<arch>/crt1.c . The monstartup function
has a manpage that describes its arguments. eprol is declared via some
__asm__() code in crt1.c to ensure that it's the first symbol in
gcrt1.o's text segment, which ensures that it's the first symbol in a
program's text segment (since gcrt1.o is the first thing linked into a
profiled binary).
--
Dan Nelson
dnelson@allantgroup.com
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