Re: [uClinux-dev] [PATCH] elf2flt.ld: give .note.ABI-tag its own output section
On Wednesday, December 15, 2010 20:40:14 David McCullough wrote: I thought that if it's not needed in the flat file, perhaps you should have put it lower in the ld script like the .debug sections etc, that way it will not get pushed into the text/data of the flat executable but should still be in the elf file for debugging etc ? i tried that originally, but kept getting linker errors. i think it's because the section has the alloc (A) flag on it since on ELF systems, it does get loaded and possibly checked at runtime. to get the FLAT file to discard it, i think we'd have to be a little more tricky ? perhaps create a new program header named discard and have the elf2flt utility always ignore the last program header ? -mike signature.asc Description: This is a digitally signed message part. ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] [PATCH] elf2flt.ld: give .note.ABI-tag its own output section
Jivin Mike Frysinger lays it down ... On Wednesday, December 15, 2010 20:40:14 David McCullough wrote: I thought that if it's not needed in the flat file, perhaps you should have put it lower in the ld script like the .debug sections etc, that way it will not get pushed into the text/data of the flat executable but should still be in the elf file for debugging etc ? i tried that originally, but kept getting linker errors. i think it's because the section has the alloc (A) flag on it since on ELF systems, it does get loaded and possibly checked at runtime. to get the FLAT file to discard it, i Ok. think we'd have to be a little more tricky ? perhaps create a new program header named discard and have the elf2flt utility always ignore the last program header ? If you are happy with it where it is then I won't complain ;-) Cheers, Davidm -- David McCullough, david_mccullo...@mcafee.com, Ph:+61 734352815 McAfee - SnapGear http://www.mcafee.com http://www.uCdot.org ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] [PATCH] elf2flt.ld: give .note.ABI-tag its own output section
On Thursday, December 16, 2010 16:56:56 David McCullough wrote: On Wednesday, December 15, 2010 20:40:14 David McCullough wrote: I thought that if it's not needed in the flat file, perhaps you should have put it lower in the ld script like the .debug sections etc, that way it will not get pushed into the text/data of the flat executable but should still be in the elf file for debugging etc ? i tried that originally, but kept getting linker errors. i think it's because the section has the alloc (A) flag on it since on ELF systems, it does get loaded and possibly checked at runtime. to get the FLAT file to discard it, i Ok. think we'd have to be a little more tricky ? perhaps create a new program header named discard and have the elf2flt utility always ignore the last program header ? If you are happy with it where it is then I won't complain ;-) i would love to get it discarded from the FLAT file, but i cant think of any simple answers. if you have better ideas, we can take a look ... -mike signature.asc Description: This is a digitally signed message part. ___ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
Re: [uClinux-dev] [PATCH] elf2flt.ld: give .note.ABI-tag its own output section
Jivin Mike Frysinger lays it down ...
On Thursday, December 16, 2010 16:56:56 David McCullough wrote:
On Wednesday, December 15, 2010 20:40:14 David McCullough wrote:
I thought that if it's not needed in the flat file, perhaps you should
have put it lower in the ld script like the .debug sections etc, that
way it will not get pushed into the text/data of the flat executable
but should still be in the elf file for debugging etc ?
i tried that originally, but kept getting linker errors. i think it's
because the section has the alloc (A) flag on it since on ELF systems,
it does get loaded and possibly checked at runtime. to get the FLAT
file to discard it, i
Ok.
think we'd have to be a little more tricky ? perhaps create a new
program header named discard and have the elf2flt utility always
ignore the last program header ?
If you are happy with it where it is then I won't complain ;-)
i would love to get it discarded from the FLAT file, but i cant think of any
simple answers. if you have better ideas, we can take a look ...
Pretty sure you tried this one:
Index: elf2flt.ld.in
===
RCS file: /var/cvs/elf2flt/elf2flt.ld.in,v
retrieving revision 1.5
diff -u -1 -r1.5 elf2flt.ld.in
--- elf2flt.ld.in 16 Dec 2010 01:37:41 - 1.5
+++ elf2flt.ld.in 16 Dec 2010 23:52:42 -
@@ -138,3 +138,2 @@
- .note.ABI-tag : { *(.note.ABI-tag) } flatmem
.eh_frame_hdr : { *(.eh_frame_hdr) } flatmem
@@ -209,2 +208,3 @@
.debug_varnames 0 : { *(.debug_varnames) }
+ .note.ABI-tag 0 : { *(.note.ABI-tag) }
}
Another option may be to leave it out, then add a .note.ABI-tag using
objcopy as part of the ld-elf2flt processing. Bit of a hack I know, but
gets it out of the flatfile, also gives you control over what goes into the
.note.ABI-tag in terms of kernel versions etc.
Actually, that probably won't work as you said linker errors. How about
using a copy of the XYZ.elf file in ld-elf2flt that has the .note.ABI-tag
removed ?
Cheers,
Davidm
--
David McCullough, david_mccullo...@mcafee.com, Ph:+61 734352815
McAfee - SnapGear http://www.mcafee.com http://www.uCdot.org
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[uClinux-dev] [PATCH] elf2flt.ld: give .note.ABI-tag its own output section
The .note.ABI-tag section exists to indicate to other projects (like gdb
or library loaders) information about the target OS. It doesn't actually
contain anything that is used at runtime. So while the current linker
script gathers this into the .data section, the final FLAT doesn't include
anything from it. But tools expect to find a dedicated section in ELFs
which the current section merge prevents.
So give .note.ABI-tag its own output section so gdb can locate and use it.
This shouldn't change the FLAT files produced in any way.
Signed-off-by: Mike Frysinger vap...@gentoo.org
---
elf2flt.ld.in |2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/elf2flt.ld.in b/elf2flt.ld.in
index 6871ae9..c7e01a6 100644
--- a/elf2flt.ld.in
+++ b/elf2flt.ld.in
@@ -81,7 +81,6 @@ R_RODAT *(.gnu.linkonce.r*)
*(__libc_atexit)
*(__libc_subinit)
*(__libc_subfreeres)
- *(.note.ABI-tag)
/* microblaze-specific read-only small data area
and associated locating symbols */
@@ -137,6 +136,7 @@ TOR:@symbol_pre...@__dtor_end__ = .;
PROVIDE (@symbol_pre...@__fini_array_end = .);
} flatmem :data
+ .note.ABI-tag : { *(.note.ABI-tag) } flatmem
.eh_frame_hdr : { *(.eh_frame_hdr) } flatmem
.eh_frame : { KEEP(*(.eh_frame)) } flatmem
.gcc_except_table : {
--
1.7.3.3
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Re: [uClinux-dev] [PATCH] elf2flt.ld: give .note.ABI-tag its own output section
Jivin Mike Frysinger lays it down ...
The .note.ABI-tag section exists to indicate to other projects (like gdb
or library loaders) information about the target OS. It doesn't actually
contain anything that is used at runtime. So while the current linker
script gathers this into the .data section, the final FLAT doesn't include
anything from it. But tools expect to find a dedicated section in ELFs
which the current section merge prevents.
So give .note.ABI-tag its own output section so gdb can locate and use it.
This shouldn't change the FLAT files produced in any way.
Signed-off-by: Mike Frysinger vap...@gentoo.org
---
elf2flt.ld.in |2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/elf2flt.ld.in b/elf2flt.ld.in
index 6871ae9..c7e01a6 100644
--- a/elf2flt.ld.in
+++ b/elf2flt.ld.in
@@ -81,7 +81,6 @@ R_RODAT *(.gnu.linkonce.r*)
*(__libc_atexit)
*(__libc_subinit)
*(__libc_subfreeres)
- *(.note.ABI-tag)
/* microblaze-specific read-only small data area
and associated locating symbols */
@@ -137,6 +136,7 @@ TOR: @symbol_pre...@__dtor_end__ = .;
PROVIDE (@symbol_pre...@__fini_array_end = .);
} flatmem :data
+ .note.ABI-tag : { *(.note.ABI-tag) } flatmem
.eh_frame_hdr : { *(.eh_frame_hdr) } flatmem
.eh_frame : { KEEP(*(.eh_frame)) } flatmem
.gcc_except_table : {
Applied.
I thought that if it's not needed in the flat file, perhaps you should
have put it lower in the ld script like the .debug sections etc, that way
it will not get pushed into the text/data of the flat executable but should
still be in the elf file for debugging etc ?
Cheers,
Davidm
--
David McCullough, david_mccullo...@mcafee.com, Ph:+61 734352815
McAfee - SnapGear http://www.mcafee.com http://www.uCdot.org
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