From: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] ARM: Fix __bss_start and __bss_end in linker scripts
Date: Fri, 5 Apr 2013 01:05:53 +0200 (CEST) [thread overview]
Message-ID: <436405570.1175811.1365116753714.JavaMail.root@advansee.com> (raw)
In-Reply-To: <1365113633-31281-1-git-send-email-albert.u.boot@aribaud.net>
Hi Albert,
On Friday, April 5, 2013 12:13:53 AM, Albert ARIBAUD wrote:
> Subject: [PATCH] ARM: Fix __bss_start and __bss_end in linker scripts
>
> Commit 3ebd1cbc introduced compiler-generated __bss_start
> and __bss_end__ and commit c23561e7 rewrote all __bss_end__
> as __bss_end. Their merge caused silent and harmless but
> potentially bug-inducing clashes between compiler- and linker-
> enerated __bss_end symbols.
>
> Make __bss_end and __bss_start compiler-only, and create
> __bss_base and __bss_limit for linker-only use.
>
> Reported-by: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
> Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
> ---
> arch/arm/cpu/ixp/u-boot.lds | 14 ++++++++++----
> arch/arm/cpu/u-boot.lds | 14 ++++++++++----
> board/actux1/u-boot.lds | 14 ++++++++++----
> board/actux2/u-boot.lds | 14 ++++++++++----
> board/actux3/u-boot.lds | 14 ++++++++++----
> board/dvlhost/u-boot.lds | 14 ++++++++++----
> board/freescale/mx31ads/u-boot.lds | 14 ++++++++++----
> 7 files changed, 70 insertions(+), 28 deletions(-)
>
> diff --git a/arch/arm/cpu/ixp/u-boot.lds b/arch/arm/cpu/ixp/u-boot.lds
> index 8345b55..c999829 100644
> --- a/arch/arm/cpu/ixp/u-boot.lds
> +++ b/arch/arm/cpu/ixp/u-boot.lds
> @@ -67,17 +67,23 @@ SECTIONS
>
> _end = .;
>
> +/*
> + * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c
> + * __bss_base and __bss_limit are for linker only (overlay ordering)
> + */
> +
> .bss_start __rel_dyn_start (OVERLAY) : {
> KEEP(*(.__bss_start));
> + HIDDEN(__bss_base = .);
> }
>
> - .bss __bss_start (OVERLAY) : {
> + .bss __bss_base (OVERLAY) : {
> *(.bss*)
> . = ALIGN(4);
> - __bss_end = .;
> + HIDDEN(__bss_limit = .);
> }
> - .bss_end __bss_end (OVERLAY) : {
> - KEEP(*(__bss_end));
> + .bss_end __bss_limit (OVERLAY) : {
> + KEEP(*(.__bss_end));
> }
>
> /DISCARD/ : { *(.dynstr*) }
> diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds
> index 3a1083d..0543b06 100644
> --- a/arch/arm/cpu/u-boot.lds
> +++ b/arch/arm/cpu/u-boot.lds
> @@ -81,18 +81,24 @@ SECTIONS
> *(.mmutable)
> }
>
> +/*
> + * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c
> + * __bss_base and __bss_limit are for linker only (overlay ordering)
> + */
> +
> .bss_start __rel_dyn_start (OVERLAY) : {
> KEEP(*(.__bss_start));
> + HIDDEN(__bss_base = .);
> }
>
> - .bss __bss_start (OVERLAY) : {
> + .bss __bss_base (OVERLAY) : {
> *(.bss*)
> . = ALIGN(4);
> - __bss_end = .;
> + HIDDEN(__bss_limit = .);
> }
>
> - .bss_end __bss_end (OVERLAY) : {
> - KEEP(*(__bss_end));
> + .bss_end __bss_limit (OVERLAY) : {
> + KEEP(*(.__bss_end));
> }
>
> /DISCARD/ : { *(.dynstr*) }
> diff --git a/board/actux1/u-boot.lds b/board/actux1/u-boot.lds
> index c76728a..7e5c4d8 100644
> --- a/board/actux1/u-boot.lds
> +++ b/board/actux1/u-boot.lds
> @@ -74,17 +74,23 @@ SECTIONS
>
> _end = .;
>
> +/*
> + * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c
> + * __bss_base and __bss_limit are for linker only (overlay ordering)
> + */
> +
> .bss_start __rel_dyn_start (OVERLAY) : {
> KEEP(*(.__bss_start));
> + HIDDEN(__bss_base = .);
> }
>
> - .bss __bss_start (OVERLAY) : {
> + .bss __bss_base (OVERLAY) : {
> *(.bss*)
> . = ALIGN(4);
> - __bss_end = .;
> + HIDDEN(__bss_limit = .);
> }
> - .bss_end __bss_end (OVERLAY) : {
> - KEEP(*(__bss_end));
> + .bss_end __bss_limit (OVERLAY) : {
> + KEEP(*(.__bss_end));
> }
>
> /DISCARD/ : { *(.dynstr*) }
> diff --git a/board/actux2/u-boot.lds b/board/actux2/u-boot.lds
> index 984f70e..ce1b7c9 100644
> --- a/board/actux2/u-boot.lds
> +++ b/board/actux2/u-boot.lds
> @@ -74,17 +74,23 @@ SECTIONS
>
> _end = .;
>
> +/*
> + * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c
> + * __bss_base and __bss_limit are for linker only (overlay ordering)
> + */
> +
> .bss_start __rel_dyn_start (OVERLAY) : {
> KEEP(*(.__bss_start));
> + HIDDEN(__bss_base = .);
> }
>
> - .bss __bss_start (OVERLAY) : {
> + .bss __bss_base (OVERLAY) : {
> *(.bss*)
> . = ALIGN(4);
> - __bss_end = .;
> + HIDDEN(__bss_limit = .);
> }
> - .bss_end __bss_end (OVERLAY) : {
> - KEEP(*(__bss_end));
> + .bss_end __bss_limit (OVERLAY) : {
> + KEEP(*(.__bss_end));
> }
>
> /DISCARD/ : { *(.dynstr*) }
> diff --git a/board/actux3/u-boot.lds b/board/actux3/u-boot.lds
> index fc48cf0..3e091dd 100644
> --- a/board/actux3/u-boot.lds
> +++ b/board/actux3/u-boot.lds
> @@ -74,17 +74,23 @@ SECTIONS
>
> _end = .;
>
> +/*
> + * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c
> + * __bss_base and __bss_limit are for linker only (overlay ordering)
> + */
> +
> .bss_start __rel_dyn_start (OVERLAY) : {
> KEEP(*(.__bss_start));
> + HIDDEN(__bss_base = .);
> }
>
> - .bss __bss_start (OVERLAY) : {
> + .bss __bss_base (OVERLAY) : {
> *(.bss*)
> . = ALIGN(4);
> - __bss_end = .;
> + HIDDEN(__bss_limit = .);
> }
> - .bss_end __bss_end (OVERLAY) : {
> - KEEP(*(__bss_end));
> + .bss_end __bss_limit (OVERLAY) : {
> + KEEP(*(.__bss_end));
> }
>
> /DISCARD/ : { *(.dynstr*) }
> diff --git a/board/dvlhost/u-boot.lds b/board/dvlhost/u-boot.lds
> index b13d3e1..fe3c21b 100644
> --- a/board/dvlhost/u-boot.lds
> +++ b/board/dvlhost/u-boot.lds
> @@ -74,17 +74,23 @@ SECTIONS
>
> _end = .;
>
> +/*
> + * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c
> + * __bss_base and __bss_limit are for linker only (overlay ordering)
> + */
> +
> .bss_start __rel_dyn_start (OVERLAY) : {
> KEEP(*(.__bss_start));
> + HIDDEN(__bss_base = .);
> }
>
> - .bss __bss_start (OVERLAY) : {
> + .bss __bss_base (OVERLAY) : {
> *(.bss*)
> . = ALIGN(4);
> - __bss_end = .;
> + HIDDEN(__bss_limit = .);
> }
> - .bss_end __bss_end (OVERLAY) : {
> - KEEP(*(__bss_end));
> + .bss_end __bss_limit (OVERLAY) : {
> + KEEP(*(.__bss_end));
> }
>
> /DISCARD/ : { *(.dynstr*) }
> diff --git a/board/freescale/mx31ads/u-boot.lds
> b/board/freescale/mx31ads/u-boot.lds
> index 264c4e8..e6885a5 100644
> --- a/board/freescale/mx31ads/u-boot.lds
> +++ b/board/freescale/mx31ads/u-boot.lds
> @@ -80,17 +80,23 @@ SECTIONS
>
> _end = .;
>
> +/*
> + * Compiler-generated __bss_start and __bss_end, see arch/arm/lib/bss.c
> + * __bss_base and __bss_limit are for linker only (overlay ordering)
> + */
> +
> .bss_start __rel_dyn_start (OVERLAY) : {
> KEEP(*(.__bss_start));
> + HIDDEN(__bss_base = .);
> }
>
> - .bss __bss_start (OVERLAY) : {
> + .bss __bss_base (OVERLAY) : {
> *(.bss*)
> . = ALIGN(4);
> - __bss_end = .;
> + HIDDEN(__bss_limit = .);
> }
> - .bss_end __bss_end (OVERLAY) : {
> - KEEP(*(__bss_end));
> + .bss_end __bss_limit (OVERLAY) : {
> + KEEP(*(.__bss_end));
> }
>
> /DISCARD/ : { *(.bss*) }
> --
> 1.7.10.4
>
>
Looks good, but what about the __bss_end in
ASSERT(__bss_end < (CONFIG_SPL_TEXT_BASE + CONFIG_SPL_MAX_SIZE), "SPL image too big");
?
Shouldn't it be replaced with __bss_limit, or even better, with __image_copy_end
(why should BSS be taken into account for SPL image size?)?
Best regards,
Beno?t
next prev parent reply other threads:[~2013-04-04 23:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 22:13 [U-Boot] [PATCH] ARM: Fix __bss_start and __bss_end in linker scripts Albert ARIBAUD
2013-04-04 23:05 ` Benoît Thébaudeau [this message]
2013-04-04 23:13 ` Benoît Thébaudeau
2013-04-04 23:54 ` Albert ARIBAUD
2013-04-05 3:44 ` Benoît Thébaudeau
2013-04-05 6:00 ` Albert ARIBAUD
2013-04-05 13:53 ` Tom Rini
2013-04-05 15:59 ` Stephen Warren
2013-04-11 17:52 ` Tom Warren
2013-04-11 17:59 ` Albert ARIBAUD
2013-04-11 18:13 ` Tom Warren
2013-04-05 13:56 ` Benoît Thébaudeau
2013-04-05 16:00 ` Tom Rini
2013-04-05 17:32 ` Benoît Thébaudeau
2013-04-05 17:55 ` Tom Rini
2013-04-05 19:17 ` Albert ARIBAUD
2013-04-05 19:28 ` Albert ARIBAUD
2013-04-05 19:44 ` Tom Rini
2013-04-05 20:04 ` Albert ARIBAUD
2013-04-05 20:23 ` Tom Rini
2013-04-08 19:03 ` Albert ARIBAUD
2013-04-08 19:56 ` Tom Rini
2013-04-08 20:05 ` Albert ARIBAUD
2013-04-04 23:12 ` Albert ARIBAUD
2013-04-11 15:30 ` Albert ARIBAUD
2013-04-11 15:43 ` [U-Boot] [PATCH V2] " Albert ARIBAUD
2013-04-12 16:34 ` Albert ARIBAUD
2013-04-13 21:16 ` Albert ARIBAUD
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