From: Gerald Pfeifer <gerald@pfeifer.com>
To: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Cc: Paolo Bonzini <bonzini@gnu.org>,
gcc-patches@gcc.gnu.org,
"Joseph S. Myers" <joseph@codesourcery.com>,
Ralf Wildenhues <Ralf.Wildenhues@gmx.de>,
Mike Stump <mikestump@comcast.net>,
"Loren J. Rittle" <ljrittle@acm.org>,
Kai Tietz <ktietz@redhat.com>,
Dave Korn <dave.korn.cygwin@gmail.com>,
Jason Thorpe <thorpej@netbsd.org>,
Krister Walfridsson <krister.walfridsson@gmail.com>,
Uros Bizjak <ubizjak@gmail.com>,
Richard Henderson <rth@redhat.com>,
Eric Botcazou <ebotcazou@adacore.com>
Subject: Re: [build] Move ENABLE_EXECUTE_STACK to toplevel libgcc
Date: Sat, 04 Jun 2011 11:00:00 -0000 [thread overview]
Message-ID: <alpine.LNX.2.00.1106041258330.3492@gerinyyl.fvgr> (raw)
In-Reply-To: <yddvcwmrkaj.fsf@manam.CeBiTec.Uni-Bielefeld.DE>
On Fri, 3 Jun 2011, Rainer Orth wrote:
> * FreeBSD uses the unmodified address passed to __enable_execute_stack
> to call mprocted, while all others round both address and size to a
> pagesize boundary. I cannot imagine that FreeBSD supports
> byte-granularity mprotect, so this seems an oversight.
The man page of mprotect on FreeBSD 9 (the next release) states the
following which seems supportive of your theory:
NAME
mprotect -- control the protection of pages
:
DESCRIPTION
The mprotect() system call changes the specified pages to have protection
prot. Not all implementations will guarantee protection on a page basis;
the granularity of protection changes may be as large as an entire
region. A region is the virtual address space defined by the start and
end addresses of a struct vm_map_entry.
Gerald
next prev parent reply other threads:[~2011-06-04 11:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 18:09 Rainer Orth
2011-05-30 20:09 ` Kai Tietz
2011-05-31 9:45 ` Paolo Bonzini
2011-05-31 16:40 ` Rainer Orth
2011-05-31 16:57 ` Paolo Bonzini
2011-06-03 15:45 ` Rainer Orth
2011-06-03 16:01 ` Paolo Bonzini
2011-06-06 9:18 ` Rainer Orth
2011-06-06 9:23 ` Paolo Bonzini
2011-06-07 15:20 ` Joseph S. Myers
2011-06-07 15:31 ` Rainer Orth
2011-06-07 15:45 ` Paolo Bonzini
2011-06-07 19:17 ` Joseph S. Myers
2011-06-09 7:50 ` Rainer Orth
2011-06-09 9:57 ` Joseph S. Myers
2011-06-09 12:06 ` Bernd Schmidt
2011-06-04 11:00 ` Gerald Pfeifer [this message]
2011-06-04 11:17 ` Andreas Schwab
2011-06-07 14:00 ` Joseph S. Myers
2011-06-07 14:57 ` Rainer Orth
2011-05-31 18:11 ` Mike Stump
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