----- Original Message -----
> From: "Jan Stancek" <[email protected]>
> To: "Petr Holasek" <[email protected]>
> Cc: [email protected], "Eric B Munson"
> <[email protected]>
> Sent: Wednesday, 26 November, 2014 10:14:42 AM
> Subject: Re: [PATCH] put address of zero size file segment above 0x80000000
>
>
>
>
>
> ----- Original Message -----
> > From: "Petr Holasek" <[email protected]>
> > To: [email protected]
> > Cc: "Jan Stancek" <[email protected]>, "Eric B Munson"
> > <[email protected]>, [email protected]
> > 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.
Scratch that, it doesn't work everywhere, e.g. RHEL6.5. The binary is fine
with the exception, that ".empty" section is not in separate segment:
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .note.ABI-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr
.gnu.version .gnu.version_r .rela.dyn .rela.plt .init .plt .text .empty
Regards,
Jan
>
> 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 <[email protected]>
> > ---
> > 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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