From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: Lukasz Majewski <lukma@denx.de>, Fangrui Song <maskray@google.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Joseph Myers <joseph@codesourcery.com>,
Carlos O'Donell <carlos@redhat.com>,
libc-alpha <libc-alpha@sourceware.org>
Subject: Re: [PATCH] dl: Use "adr" assembler command to get proper load address
Date: Wed, 8 Sep 2021 16:19:46 -0300 [thread overview]
Message-ID: <16812ef5-e21b-ba69-7ee7-a0c5a094ad01@linaro.org> (raw)
In-Reply-To: <20210908170524.4be44bf0@ktm>
On 08/09/2021 12:05, Lukasz Majewski wrote:
>
> The r1 gets the 0xffffee80 (negative offset) value. It is then added to pc
> and used to calculate r2.
>
> For working code (with this patch applied) - there are NO such large
> values (like aforementioned 0xffffee80). The arithmetic is done on
>
> 1690: 00000020 .word 0x00000020
> 1694: 0002be7e .word 0x0002be7e
>
> which seems to work.
>
> This shouldn't be a problem as with U2 the arithmetic shall work.
> However, I've noticed (with passing LD_DEBUG=all) that the
> ld-linux-armhf.so.3 (and init) are relocated twice before execution.
>
> Why do we need to relocate it?
>
> Another question is why on this particular case the large (i.e.
> negative) offset matters?
I think it is highly unlikely the negative offset plays any role here.
Do you have a working example to trigger this issue? I am currently
testing arm for different compilers (gcc 6.2, gcc 10, gcc 11) and
with different configurations (armv5, armv6, armv7, with and without
thumb) and I haven't see any issue so far.
It might binutils related, which version are you using?
next prev parent reply other threads:[~2021-09-08 19:19 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-07 13:16 Lukasz Majewski
2021-09-07 16:49 ` Fangrui Song
2021-09-07 17:32 ` Lukasz Majewski
2021-09-07 17:44 ` Fangrui Song
2021-09-08 15:05 ` Lukasz Majewski
2021-09-08 17:41 ` Fāng-ruì Sòng
2021-09-08 19:19 ` Adhemerval Zanella [this message]
2021-09-08 20:34 ` Lukasz Majewski
2021-09-09 7:18 ` Lukasz Majewski
2021-09-09 9:49 ` Lukasz Majewski
2021-09-10 10:10 ` Lukasz Majewski
2021-09-17 8:29 ` Lukasz Majewski
2021-09-17 13:27 ` Joseph Myers
2021-09-17 16:17 ` Andreas Schwab
2021-09-26 19:58 ` Lukasz Majewski
2021-09-27 16:00 ` Joseph Myers
2021-10-05 7:45 ` Lukasz Majewski
2021-10-06 7:57 ` Fangrui Song
2021-10-06 9:03 ` Lukasz Majewski
2021-10-06 11:43 ` Lukasz Majewski
2021-10-06 12:55 ` Szabolcs Nagy
2021-10-07 9:19 ` Lukasz Majewski
2021-10-07 10:00 ` Lukasz Majewski
2021-10-07 14:15 ` Szabolcs Nagy
2021-10-07 14:58 ` Lukasz Majewski
2021-10-07 14:16 ` Adhemerval Zanella
2021-10-07 14:29 ` H.J. Lu
2021-10-07 15:57 ` Szabolcs Nagy
2021-10-07 16:22 ` H.J. Lu
2021-10-07 16:53 ` Adhemerval Zanella
2021-10-07 17:05 ` H.J. Lu
2021-10-07 17:24 ` Fāng-ruì Sòng
2021-10-08 9:15 ` Szabolcs Nagy
2021-10-11 8:56 ` Lukasz Majewski
2021-10-11 10:18 ` Szabolcs Nagy
2021-10-11 11:47 ` Lukasz Majewski
2021-10-11 12:01 ` H.J. Lu
2021-10-11 13:10 ` Lukasz Majewski
2021-10-11 13:22 ` H.J. Lu
2021-10-11 14:31 ` Lukasz Majewski
2021-10-11 13:34 ` Adhemerval Zanella
2021-10-11 12:48 ` Szabolcs Nagy
2021-10-15 7:54 ` [PATCH v2] dl: Use "adr" assembler command to get proper load address on ARM Lukasz Majewski
2021-10-15 12:09 ` Szabolcs Nagy
2021-10-15 12:21 ` H.J. Lu
2021-10-15 12:59 ` Lukasz Majewski
2021-10-15 23:53 ` Fāng-ruì Sòng
2021-10-18 11:08 ` Szabolcs Nagy
2021-10-18 11:35 ` Florian Weimer
2021-10-19 12:03 ` Lukasz Majewski
2021-10-25 10:18 ` Lukasz Majewski
2021-10-25 10:25 ` Florian Weimer
2021-10-25 10:53 ` Lukasz Majewski
2021-10-25 13:34 ` Szabolcs Nagy
2021-10-25 14:04 ` Lukasz Majewski
2021-10-25 15:09 ` Szabolcs Nagy
2021-10-25 17:26 ` Joseph Myers
2021-10-26 13:52 ` Lukasz Majewski
2021-10-26 20:55 ` Joseph Myers
2021-10-27 9:38 ` Szabolcs Nagy
2021-10-25 18:25 ` Lukasz Majewski
2021-10-15 13:59 ` Lukasz Majewski
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