A target that sets EMBEDDED non-empty is one that doesn't want to put
the ELF file header or program header in a memory image. Likely the
target isn't interested in supporting dynamically loaded executables,
shared libraries, or PIEs, because loaders for such binaries generally
require program headers to be present. This isn't 100% true though.
The target might be one where the loader accesses the file system in
order to retrieve headers.
Also, note that not all "shared libraries" require gcc -shared or the
shared library support in the linker. I believe one implementation of
shared libraries on uclinux is like this.
So, this patch removes GENERATE_SHLIB_SCRIPT and GENERATE_PIE_SCRIPT
in most emulparams files where EMBEDDED is set, restoring the shared
lib and pie support in emulparams files that unset EMBEDDED after
including a file where the support is removed.
Exceptions to the general rule that EMBEDDED disables shared libs are:
arm*-*-symbianelf*, where the OS wants shared library support
without ELF program headers in the image, and
sh*-*-uclinux*, where I've left things as they were, ie. both
EMBEDDED and GENERATE_SHLIB_SCRIPT because I'm unsure as to the
shared library scheme.
* emulparams/aarch64elf.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Don't set.
* emulparams/aarch64elf32.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Don't set.
* emulparams/arcelf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/armelf.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Don't set.
* emulparams/armelf_fbsd.sh (GENERATE_SHLIB_SCRIPT): Set.
* emulparams/armelf_nbsd.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Set.
* emulparams/armelf_vxworks.sh (GENERATE_SHLIB_SCRIPT): Set.
* emulparams/armsymbian.sh (GENERATE_SHLIB_SCRIPT): Set.
* emulparams/elf32bfin.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/elf32microblaze.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/score3_elf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/shelf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/shelf_nbsd.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Set.
* emulparams/shelf_uclinux.sh (GENERATE_SHLIB_SCRIPT): Set.
SymbianOS.
* emulparams/armsymbian.sh (OTHER_READONLY_SECTIONS): Define, so
as to include .ARM.exidx$${Base,Limit}.
* ld/scripttempl/armbpabi.sc: Move .plt to end of text segment.
Define IMAGE$$ER_RO$${Base,Limit} and SHT$$INIT_ARRAY$${Base,Limit}.
Put .init_array, .fini_array, etc. into the read-only data
segment.
* ldexp.h (segment_type): New type.
(segments): New variable.
* ldexp.c (segments): New variable.
(exp_print_token): Handle SEGMENT_START.
(fold_binary): Likewise.
* ldgram.y (SEGMENT_START): Declare it as a token.
(exp): Handle SEGMENT_START.
* ldlang.h (lang_address_statement_type): Add segment field.
(lang_section_start): Change prototype.
* ldlang.c (map_input_to_output_sections): Do not process section
assignments if a corresponding SEGMENT_START has already been
seen.
(lang_section_start): Add segment parameter.
* ldlex.l (SEGMENT_START): Add it.
* lexsup.c (seg_segment_start): New function.
(parse_args): Use it for -Tbss, -Tdata, and -Ttext.
* ld.texinfo (SEGMENT_START): Document it.
* emulparams/armsymbian.sh (EMBEDDED): Set it.
* scripttempl/armbpabi.sc: Use SEGMENT_START to control segment
base addresses. Do not map relocations.
* NEWS: Mention SEGMENT_START.
* elf.c (_bfd_elf_make_dynamic_segment): New function, split out
from ...
(map_sections_to_segments): ... here. Use it. Assign a file
position to the .dynamic section if it is not loadable, but part
of the PT_DYNAMIC segment.
* elf32-arm.h (elf32_arm_finish_dynamic_sections): Use file
offsets, not VMAs, for the BPABI. Do not fill in the header in
the .got.plt section for the BPABI.
* elfarm-nabi.c (elf32_arm_symbian_modify_segment_map): Add a
PT_DYNAMIC segment.
(elf_backend_want_got_plt): Define to zero for Symbian OS.
* emulparams/armsymbian.sh: Use armbpabi script.
* scripttempl/armbpabi.sc: New script.
* configure.in (bfd_elf32_bigarm_symbian_vec): Add it.
(bfd_elf32_littlearm_symbian_vec): Likewise.
* configure: Regenerated.
* elf-bfd.h (elf_backend_data): Add dynamic_sec_flags.
* elf32-arm.h (PLT_HEADER_SIZE): Do not define.
(PLT_ENTRY_SIZE): Likewise.
(bfd_vma_elf32_arm_symbian_plt_entry): New
variable.
(elf32_arm_link_hash_table): Add plt_header_size, plt_entry_size,
and symbian_p.
(create_got_section): Don't create sections when generating BPABI
objects.
(elf32_arm_create_dynamic_sections): Tidy.
(elf32_arm_link_hash_table_create): Set plt_header_size,
plt_entry_size, and symbian_p.
(elf32_arm_check_relocs): Do not mark .rel.dyn as loadable when
generating BPABI objects.
(allocate_dynrelocs): Use htab->plt_header_size, not
PLT_HEADER_SIZE. Do not add to .got.plt when
generating BPABI objects.
(elf32_arm_finish_dynamic_symbol): Generate Symbian OS PLTs.
* elfarm-nabi.c: Add SymbianOS target vectors.
* elflink.c (_bfd_elf_create_got_section): Use dynamic_sec_flags.
(_bfd_elf_link_create_dynamic_sections): Likewise.
* elfxx-target.h (ELF_DYNAMIC_SEC_FLAGS): New macro.
(elfNN_bed): Use it.
* targets.c (bfd_elf32_bigarm_symbian_vec): New variable.
(bfd_elf32_littlearm_symbian_vec): Likewise.
(_bfd_target_vector): Add them.
* Makefile.am (TARG_ENV_HFILES): Add te-symbian.h.
* Makefile.in: Regenerated.
* configure.in: Set em for arm*-*-symbianelf*.
* configure: Regenerated.
* config/tc-arm.c (elf32_arm_target_format): Use Symbian target
vectors when appropriate.
* config/te-symbian.h: New file.
* Makefile.am (ALL_EMULATIONS): Add earmsymbian.o.
(earmsymbian.c): New target.
* configure.tgt: Use armsymbian emulation for arm*-*-symbianelf*.
* Makefile.in: Regenerated.
* aclocal.m4: Likewise.
* configure: Likewise.
* emulparams/armsymbian.sh: New file.
