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Re: new syscall stub support for ia64 libc

From: David Mosberger <davidm at napali dot hpl dot hp dot com>
To: Jakub Jelinek <jakub at redhat dot com>
Cc: davidm at hpl dot hp dot com, Ulrich Drepper <drepper at redhat dot com>,libc-hacker at sources dot redhat dot com
Date: Mon, 8 Dec 2003 20:41:54 -0800
Subject: Re: new syscall stub support for ia64 libc
References: <16309.13147.182193.889647@napali.hpl.hp.com><3FB53B28.5010102@redhat.com><16309.62461.395811.966659@napali.hpl.hp.com><3FB90F86.3060908@redhat.com><16313.53298.919379.719647@napali.hpl.hp.com><3FB9D475.7020005@redhat.com><16324.23316.792750.173666@napali.hpl.hp.com><16333.36844.428517.980589@napali.hpl.hp.com><20031208160844.GZ12344@sunsite.ms.mff.cuni.cz><16340.52359.848497.31536@napali.hpl.hp.com><20031208190958.GA12344@sunsite.ms.mff.cuni.cz>
Reply-to: davidm at hpl dot hp dot com

>>>>> On Mon, 8 Dec 2003 20:09:58 +0100, Jakub Jelinek <jakub@redhat.com> said:

  Jakub> In 2.4.x kernels the signal trampoline indeed lived between
  Jakub> 0xa000000000010000 and 0xa000000000020000, but with the VDSO
  Jakub> changes it now is at 0xa0000000000207e0 though.

It occurred to me that another (much simpler) approach would be to
simply remove the guard-page and then move the DSO mappings down by
64KB.  The combination of READONLY and EXECUTEONLY DSO mappings should
have the same effect as the single NOPROT guard-page, so it's not
strictly needed anymore.

	--david

References:
- Re: new syscall stub support for ia64 libc
  - From: David Mosberger
- Re: new syscall stub support for ia64 libc
  - From: Jakub Jelinek
- Re: new syscall stub support for ia64 libc
  - From: David Mosberger
- Re: new syscall stub support for ia64 libc
  - From: Jakub Jelinek

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