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Always create dynamic sections for -E/--dynamic-list 

In embedded environments, including boot loaders, the non-PIC executable
needs to export its symbols to modules loaded in the future.  We should
always create dynamic sections for -E/--dynamic-list.

bfd/

	PR ld/19617
	* elflink.c (elf_link_add_object_symbols): Always create dynamic
	sections for -E/--dynamic-list.

ld/

	PR ld/19617
	* testsuite/ld-elf/pr19617.s: New file.
	* testsuite/ld-elf/pr19617a.d: Likewise.
	* testsuite/ld-elf/pr19617b.d: Likewise.
	* testsuite/ld-elf/pr19617c.d: Likewise.
This commit is contained in:
H.J. Lu 2016-02-18 03:13:19 -08:00
parent 06ea285dcb
commit bf89386a86
7 changed files with 68 additions and 2 deletions
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6
bfd/ChangeLog
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@ -1,3 +1,9 @@
2016-02-18 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19617
* elflink.c (elf_link_add_object_symbols): Always create dynamic
sections for -E/--dynamic-list.
2016-02-17 H.J. Lu <hongjiu.lu@intel.com>
* elf64-x86-64.c (elf_backend_omit_section_dynsym): New. Defined

7
bfd/elflink.c
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@ -3598,11 +3598,14 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
/* If we are creating a shared library, create all the dynamic
sections immediately. We need to attach them to something,
so we attach them to this BFD, provided it is the right
format and is not from ld --just-symbols. FIXME: If there
format and is not from ld --just-symbols. Always create the
dynamic sections for -E/--dynamic-list. FIXME: If there
are no input BFD's of the same format as the output, we can't
make a shared library. */
if (!just_syms
&& bfd_link_pic (info)
&& (bfd_link_pic (info)
|| info->export_dynamic
|| info->dynamic)
&& is_elf_hash_table (htab)
&& info->output_bfd->xvec == abfd->xvec
&& !htab->dynamic_sections_created)

8
ld/ChangeLog
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@ -1,3 +1,11 @@
2016-02-18 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19617
* testsuite/ld-elf/pr19617.s: New file.
* testsuite/ld-elf/pr19617a.d: Likewise.
* testsuite/ld-elf/pr19617b.d: Likewise.
* testsuite/ld-elf/pr19617c.d: Likewise.
2016-02-18 Nick Clifton <nickc@redhat.com>
* Makefile.am (CXX_FOR_TARGET): Check for the presence of an

19
ld/testsuite/ld-elf/pr19617.s Normal file
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@ -0,0 +1,19 @@
.data
.global bar
bar:
.type bar,"object"
.long 0
.text
.type start,"function"
.global start
start:
.type _start,"function"
.global _start
_start:
.type __start,"function"
.global __start
__start:
.type main,"function"
.global main
main:
.long 0

12
ld/testsuite/ld-elf/pr19617a.d Normal file
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@ -0,0 +1,12 @@
#source: pr19617.s
#ld: -E
#readelf : --dyn-syms --wide
Symbol table '\.dynsym' contains [0-9]+ entries:
+Num: +Value +Size Type +Bind +Vis +Ndx Name
+0: 0+ +0 +NOTYPE +LOCAL +DEFAULT +UND +
#...
+[0-9]+: +[a-f0-9]+ +0 +FUNC +GLOBAL +DEFAULT +[0-9]+ +start
#...
+[0-9]+: +[a-f0-9]+ +0 +OBJECT +GLOBAL +DEFAULT +[0-9]+ +bar
#pass

10
ld/testsuite/ld-elf/pr19617b.d Normal file
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@ -0,0 +1,10 @@
#source: pr19617.s
#ld: --dynamic-list-data
#readelf : --dyn-syms --wide
Symbol table '\.dynsym' contains [0-9]+ entries:
+Num: +Value +Size Type +Bind +Vis +Ndx Name
+0: 0+ +0 +NOTYPE +LOCAL +DEFAULT +UND +
#...
+[0-9]+: +[a-f0-9]+ +0 +OBJECT +GLOBAL +DEFAULT +[0-9]+ +bar
#pass

8
ld/testsuite/ld-elf/pr19617c.d Normal file
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@ -0,0 +1,8 @@
#source: pr19617.s
#ld: --dynamic-list-data
#readelf : --dyn-syms --wide
#failif
#...
+[0-9]+: +[a-f0-9]+ +0 +FUNC +GLOBAL +DEFAULT +[0-9]+ +start
#...