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Re: [RFC PATCH] ld/ARM: Increase maximum page size to 64kB

From: Kyrill Tkachov <kyrylo dot tkachov at arm dot com>
To: Will Newton <will dot newton at linaro dot org>
Cc: "nickc at redhat dot com" <nickc at redhat dot com>, "binutils at sourceware dot org" <binutils at sourceware dot org>
Date: Wed, 16 Jul 2014 09:18:38 +0100
Subject: Re: [RFC PATCH] ld/ARM: Increase maximum page size to 64kB
Authentication-results: sourceware.org; auth=none
References: <1403795923-24306-1-git-send-email-will dot newton at linaro dot org> <53B2893F dot 1010207 at redhat dot com> <CANu=DmgS86Tgy=Wu=dGNMdgckxjDxVoxXsp2OmvTkENBd-uoeg at mail dot gmail dot com> <53BE5454 dot 1040800 at arm dot com> <CANu=Dmhm3Uyrep1eTZzTmVJeWrCemCc4c06Eyg_g4Y7Jd9CZMg at mail dot gmail dot com>


On 10/07/14 12:00, Will Newton wrote:

On 10 July 2014 09:52, Kyrill Tkachov <kyrylo.tkachov@arm.com> wrote:

On 08/07/14 15:02, Will Newton wrote:

On 1 July 2014 11:11, Nicholas Clifton <nickc@redhat.com> wrote:

Hi Will,

bfd/ChangeLog:

2014-06-26  Will Newton  <will.newton@linaro.org>

          * elf32-arm.c (ELF_MAXPAGESIZE): Increase the default
          value to 64kB and remove custom setting for NaCl.

ld/ChangeLog:

2014-06-26  Will Newton  <will.newton@linaro.org>

          * emulparams/armelf_linux.sh (TEXT_START_ADDR): Increase
          alignment to 64kB boundary.

ld/testsuite/ChangeLog:

2014-06-26  Will Newton  <will.newton@linaro.org>

          * ld-arm/arm-lib.ld: Increase MAXPAGESIZE value to
          match bfd.
          * ld-arm/cortex-a8-fix-bl-rel-plt.d: Update offsets to
          take into account increased segment alignment.
          * ld-arm/ifunc-gdesc.r: Likewise.
          * ld-arm/tls-lib.d: Likewise.


Approved - please apply.

Thanks. If anybody sees any breakage then please shout.

Hi Will,

In the libstdc++ tetsuite I'm seeing some failures of the sort:

/arm-none-eabi/install/arm-none-eabi/bin/ld: warning: address of
`text-segment' isn't multiple of maximum page size

FAIL: 17_intro/freestanding.cc (test for excess errors)

I haven't dug into it yet, but your patch is the first that came to mind
when seeing this.
Is that a problem in gcc/libstdc++?

I'm not sure, but it would be interesting to find out. Do you have any
more information e.g. command line or linker script being used?


Hi Will,

Sorry for the delay. The warning I was seeing was due to some bare-metalspecs files that I was using placing the text segment at anon-64k-aligned position.

That's not a problem with this patch.

Kyrill


It seems that building libstdc++ involves building the whole of gcc. :-/

References:
- Re: [RFC PATCH] ld/ARM: Increase maximum page size to 64kB
  - From: Nicholas Clifton
- Re: [RFC PATCH] ld/ARM: Increase maximum page size to 64kB
  - From: Will Newton
- Re: [RFC PATCH] ld/ARM: Increase maximum page size to 64kB
  - From: Kyrill Tkachov
- Re: [RFC PATCH] ld/ARM: Increase maximum page size to 64kB
  - From: Will Newton

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