From mboxrd@z Thu Jan 1 00:00:00 1970 From: Albert ARIBAUD Date: Thu, 11 Apr 2013 17:30:05 +0200 Subject: [U-Boot] [PATCH] ARM: Fix __bss_start and __bss_end in linker scripts In-Reply-To: <1365113633-31281-1-git-send-email-albert.u.boot@aribaud.net> References: <1365113633-31281-1-git-send-email-albert.u.boot@aribaud.net> Message-ID: <20130411173005.7c771307@lilith> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Fri, 5 Apr 2013 00:13:53 +0200, Albert ARIBAUD wrote: > 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 > Signed-off-by: Albert ARIBAUD > --- > 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*) } Officially, HIDDEN() is known only from binutils 2.23 up, even though Ubuntu/Linaro ARM binutils 2.22.90.20120919 knows about it. HIDDEN() fails for ELDK 4.2 and 5.2.1 as well as Ubuntu/Linaro 2.23.52.20120713. Amicalement, -- Albert.