----- Original Message -----
> From: "Petr Holasek" <phola...@redhat.com>
> To: libhugetlbfs-devel@lists.sourceforge.net
> Cc: "Jan Stancek" <jstan...@redhat.com>, "Eric B Munson" <emun...@mgebm.net>,
> phola...@redhat.com
> Sent: Tuesday, 25 November, 2014 3:00:40 PM
> Subject: [PATCH] put address of zero size file segment above 0x80000000
>
> zero_filesize_segment tescase fails on s390x with segfault because program
> header virtual address is set to very low value below zSeries default
> 0x80000000 address.
>
> I haven't found a way how to set custom virtual base address on s390x since
> ld
> option --image-base is not supported there.
>
> When the address of file segment is set above 0x80000000, binary is linked
> properly and testcase passes.
Petr,
This fixes it for me on 64bit:
# ldd ./tests/obj64/zero_filesize_segment
libpthread.so.0 => /lib64/libpthread.so.0 (0x000003fffd54e000)
libdl.so.2 => /lib64/libdl.so.2 (0x000003fffd548000)
libhugetlbfs_privutils.so => /lib64/libhugetlbfs_privutils.so
(0x000003fffd535000)
libc.so.6 => /lib64/libc.so.6 (0x000003fffd394000)
/lib/ld64.so.1 (0x000002aab7cd5000)
but output from ldd on 32bit is not what I expected:
# ldd ./tests/obj32/zero_filesize_segment
not a dynamic executable
As another clue for people on list, I'm attaching alternative patch
from bug report, which can avoid the issue by replacing absolute
address with one relative to .text.
Regards,
Jan
diff --git a/tests/Makefile b/tests/Makefile
index e2e1156..8487cfe 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -179,11 +179,11 @@ obj64/%.ldscript: obj64/%.o obj64/testutils.o
$(LDSCRIPT_TESTS:%=obj32/%): obj32/%: %.ld obj32/%.o obj32/testutils.o
@$(VECHO) LD32 "(preload test)" $@
- $(CC32) $(LDFLAGS) $(LDFLAGS32) -o $@ -Lobj32 $^ $(LDLIBS) || cp
$(BADTOOLCHAIN) $@
+ $(CC32) $(LDFLAGS) $(LDFLAGS32) -o $@ -Lobj32 $(filter-out *.ld,$^) -T
$*.ld $(LDLIBS) || cp $(BADTOOLCHAIN) $@
$(LDSCRIPT_TESTS:%=obj64/%): obj64/%: %.ld obj64/%.o obj64/testutils.o
@$(VECHO) LD64 "(preload test)" $@
- $(CC64) $(LDFLAGS) $(LDFLAGS64) -o $@ -Lobj64 $^ $(LDLIBS) || cp
$(BADTOOLCHAIN) $@
+ $(CC64) $(LDFLAGS) $(LDFLAGS64) -o $@ -Lobj64 $(filter-out *.ld,$^) -T
$*.ld $(LDLIBS) || cp $(BADTOOLCHAIN) $@
$(HUGELINK_TESTS:%=obj32/%): %: %.o obj32/testutils.o
@$(VECHO) LD32 "(hugelink test)" $@
diff --git a/tests/zero_filesize_segment.ld b/tests/zero_filesize_segment.ld
index 7f2fe12..21977e5 100644
--- a/tests/zero_filesize_segment.ld
+++ b/tests/zero_filesize_segment.ld
@@ -1,7 +1,9 @@
SECTIONS
{
- .empty (0x20000000) : {
+ . = . + 0x4000;
+ .empty : {
__empty_segment = .;
- . = . + 4;
+ . = . + 0x4000;
}
}
+INSERT AFTER .text;
>
> Signed-off-by: Petr Holasek <phola...@redhat.com>
> ---
> tests/zero_filesize_segment.ld | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tests/zero_filesize_segment.ld b/tests/zero_filesize_segment.ld
> index 7f2fe12..813a92f 100644
> --- a/tests/zero_filesize_segment.ld
> +++ b/tests/zero_filesize_segment.ld
> @@ -1,6 +1,6 @@
> SECTIONS
> {
> - .empty (0x20000000) : {
> + .empty (0x90000000) : {
> __empty_segment = .;
> . = . + 4;
> }
> --
> 1.9.3
>
>
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