This patch fixes a number of issues in the ARC backend.
- The ARC size_dynamic_sections was trashing dynamic section contents,
in particular the .gnu.version_d contents. Those versions
definitions are therefore lost so they do not drain from the strtab,
resulting in assertion failures.
- The code attempting to set DT_TEXTREL was completely bogus.
- The ARC finish_dynamic_sections would segfault on trying to set
sh_entsize for .rela.plt if that section had been discarded.
- arc_create_dynamic_sections wouldn't have ever created dynamics
sections, which was just as well since the places it was called were
way too late to create dynamic sections. Its usefulness then
devolved down to finding just one dynamic section. All the others
packaged into a struct were unused.
- .interp wasn't set for PIEs.
* elf32-arc.c (struct dynamic_sections): Delete.
(enum dyn_section_types): Delete.
(dyn_section_names): Delete.
(arc_create_dynamic_sections): Delete.
(elf_arc_finish_dynamic_sections): Don't call the above. Don't
segfault on discarded .rela.plt section.
(elf_arc_size_dynamic_sections): Formatting. Don't call
arc_create_dynamic_sections. Don't allocate memory for sections
handled by the generic linker. Correct code finding relocs in
read-only sections. Set SEC_EXCLUDE on zero size .got,
.got.plt, and .dynbss sections. Do set .interp for pies.
PR ld/20815
bfd * elf.c (elf_modify_segment_map): Allow empty LOAD segments if
they contain the program headers.
(_bfd_elf_map_sections_to_segments): If the linker created the
PHDR segment then always attempt to include it in a LOAD segment.
(assign_file_positions_for_non_load_sections): Allow LOAD segments
to overlap PHDR segments.
(phdr_sorter): New function. Sorts program headers.
(assign_file_positions_except_relocs): Sort the program headers
before writing them out. Issue an error if the PHDR segment is
not covered by a LOAD segment, unless the backend allows it.
* elf-bfd.h (struct elf_backend_data): Add
elf_backend_allow_non_load_phdr.
* elfxx-target.h (elf_backend_allow_non_load_phdr): Provide
default definition that returns FALSE.
(elfNN_bed): Initialise the elf_backend_allow_non_load_phdr
field.
* elf64-hppa.c (elf64_hppa_allow_non_load_phdr): New function.
Returns TRUE.
(elf_backend_allow_non_load_phdr): Define.
* elf-m10300.c (_bfd_mn10300_elf_size_dynamic_sections): Do not
place the interpreter string into the .interp section if the
nointerp flag is set in the link info structure.
* elf32-arc.c (elf_arc_size_dynamic_sections): Likewise.
* elf32-score7.c (score_elf_final_link_relocate): Allow for the
_gp symbol not being part of the output.
binutils* readelf.c (process_program_headers): Check PT_LOAD and PT_PHDR
segments for validity.
ld * ld.texinfo: Note that PT_TLS can be used as a segment type.
* testsuite/ld-discard/discard.ld: Add space for program headers.
* testsuite/ld-elf/flags1.ld: Likewise.
* testsuite/ld-elf/maxpage3.t: Likewise.
* testsuite/ld-elf/noload-1.t: Likewise.
* testsuite/ld-elf/orphan.ld: Likewise.
* testsuite/ld-elf/overlay.t: Likewise.
* testsuite/ld-elf/pr14052.t: Likewise.
* testsuite/ld-elf/pr19539.t: Likewise.
* testsuite/ld-elf/provide-hidden-1.ld: Likewise.
* testsuite/ld-elf/provide-hidden-s.ld: Likewise.
* testsuite/ld-elf/weak-dyn-1.ld: Likewise.
* testsuite/ld-i386/pr19539.t: Likewise.
* testsuite/ld-scripts/defined.t: Likewise.
* testsuite/ld-scripts/defined6.t: Likewise.
* testsuite/ld-scripts/dynamic-sections.t: Likewise.
* testsuite/ld-scripts/empty-aligned.t: Likewise.
* testsuite/ld-scripts/provide-2.t: Likewise.
* testsuite/ld-scripts/provide-4.t: Likewise.
* testsuite/ld-vax-elf/plt-local.ld: Likewise.
* testsuite/ld-x86-64/pr19539.t: Likewise.
* testsuite/ld-elf/ehdr_start-missing.d: Do not initialise the
dynamic linker.
* testsuite/ld-elf/ehdr_start-weak.d: Likewise.
* testsuite/ld-elf/elf.exp (pr14170, pr17068): Likewise.
* testsuite/ld-elf/loadaddr1.d: Update expected readelf output.
* testsuite/ld-elf/noload-2.d: Likewise.
* testsuite/ld-powerpc/vxworks2.sd: Likewise.
* testsuite/ld-scripts/phdrs3a.d: Likewise.
* testsuite/ld-scripts/size-2.d: Likewise.
* testsuite/ld-elf/group.ld: Add program headers.
* testsuite/ld-elf/overlay.d: Skip for SPU.
* testsuite/ld-elf/flags1.d: Skip for RX.
* testsuite/ld-elf/pr19162.d: Skip for HPPA64.
* testsuite/ld-elf/pr19539.d: Skip for ALPHA.
* testsuite/ld-scripts/empty-orphan.t: Update program headers.
* testsuite/ld-scripts/size-2.t: Likewise.
Forgot to set should_relocate to TRUE in case of GOT and TLS relocations of
undefined symbols for shared libraries.
In dynamic libraries if symbol is not known the instruction relocation would
not be resolved to point to the respective .got entry.
A test was created to detect similar future mistakes.
bfd/ChangeLog:
Cupertino Miranda <cmiranda@synopsys.com>
* elf32-arc.c (elf_arc_relocate_section): Changed. Set should_relocate
to TRUE for GOT and TLS relocs.
ld/ChangeLog:
Cupertino Miranda <cmiranda@synopsys.com>
* ld/testsuite/ld-arc/tls_gd-01.s: Added a testcase for this patch.
* ld/testsuite/ld-arc/tls_gd-01.d: Likewise.
ARC was overloading this options by forcing DT_INIT AND DT_FINI
to always point to _init and _fini, respectively.
bfd/ChangeLog:
Cupertino Miranda <cmiranda@synospsys.com>
* elf32-arc.c (elf_arc_finish_dynamic_sections): Changed.
Fixed conditions related to dynamic relocs relative offset patching.
Added arc_link_hash_table to be able to always generate and track
.rela.bss section.
bfd/ChangeLog:
Cupertino Miranda <cmiranda@synopsys.com>
* elf-bfd.h: Added ARC_ELF_DATA to enum elf_target_id.
* elf32-arc.c (struct elf_arc_link_hash_entry): Added.
(struct elf_arc_link_hash_table): Likewise.
(elf_arc_link_hash_newfunc): Likewise.
(elf_arc_link_hash_table_free): Likewise.
(arc_elf_link_hash_table_create): Likewise.
(elf_arc_relocate_section): Fixed conditions related to dynamic
(elf_arc_check_relocs): Likewise.
(arc_elf_create_dynamic_sections): Added
(elf_arc_adjust_dynamic_symbol): Changed access to .rela.bss to be done
through the hash table.
This patch adds function elf32_arc_grok_parse to parse NOTE section of core
dump files. GDB requires this to work properly with core dumps.
bfd/
2016-08-24 Anton Kolesov <Anton.Kolesov@synopsys.com>
* elf32-arc.c (elf32_arc_grok_prstatus): New function.
Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
bfd * elf32-arc.c (PR_DEBUG): Delete.
Fix printing of debug information. Fix formatting of debug
statements.
(debug_arc_reloc): Handle symbols that are not from an input file.
(arc_do_relocation): Remove excessive exclamation points.
(elf_arc_relocate_section): Print an informative message if the
relocation fails, even if debugging is not enabled.
* arc-got.h: Fix formatting. Fix printing of debug information.
(new_got_entry_to_list): Use xmalloc.
* config.bfd: use the big-endian arc vector as the default vector
for big-endian arc targets.
ld * testsuite/ld-arc/arc.exp: Always run the sda-relocs test in
little endian mode.
TLS relocations did not support multiple TLS modes for the same
symbol in a single object file.
Refactored how GOT and TLS is implemented. Removed code duplications between
local and global symbols conditioning.
bfd/ChangeLog:
2016-06-14 Cupertino Miranda <cmiranda@synopsys.com>
* arc-got.h: Moved got related structures from elf32-arc.c to
this file. More precisely, tls_type_e, tls_got_entries, got_entry.
* (arc_get_local_got_ents,
got_entry_for_type,
new_got_entry_to_list,
tls_type_for_reloc,
symbol_has_entry_of_type,
get_got_entry_list_for_symbol,
arc_got_entry_type_for_reloc,
ADD_SYMBOL_REF_SEC_AND_RELOC,
arc_fill_got_info_for_reloc,
relocate_fix_got_relocs_for_got_info,
create_got_dynrelocs_for_single_entry,
create_got_dynrelocs_for_got_info): Added to file.
* elf32-arc.c: Removed GOT & TLS related structs and functions to
arc-got.h.
Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
- Correctly solved relocations on the .got header.
- This bug arrised from enabling RELRO (-z combreloc).
Because the .got and .got.plt sections were split in new linker
scripts the header is no longer part of sgotplt contents.
Changed the patch to sgot contents instead.
- Latest fix to .got header relocs.
bfd/
2016-06-13 Cupertino Miranda <cmiranda@synospsy.com>
* elf32-arc.c (elf_arc_finish_dynamic_sections): Changed.
Fail safe for trying to reloc GOT and PLT on non dynamic linker. Fix
issue with dynamic relocs not being generated with -pie. Removed some
structures that were not being used. Fixed typo changing RELENT to
RELAENT. Fix for all SECTOFF relocations.
bfd/
2016-06-13 Cupertino Miranda <cmiranda@synospsy.com>
* elf32-arc.c (arc_local_data, arc_local_data): Removed.
(SECTSTART): Changed.
(elf_arc_relocate_section): Fixed mistake in PIE related
condition.
(elf_arc_size_dynamic_sections): Changed DT_RELENT to DT_RELAENT.
bfd/
2016-06-13 Cupertino Miranda <cmiranda@synospsy.com>
* elf32-arc.c (elf32_arc_reloc_type_class): Defined function to
enable support for "-z combreloc" and DT_RELACOUNT.
(elf_backend_reloc_type_class): Likewise
Add support for arc/nps400 cmem instructions, these load and store
instructions are hard-wired to access "0x57f00000 + 16-bit-offset".
Supporting this relocation required some additions to the arc relocation
handling in the bfd library, as well as the standard changes required to
add a new relocation type.
There's a test of the new instructions in the assembler, and a test of
the relocation in the linker.
bfd/ChangeLog:
* reloc.c: Add BFD_RELOC_ARC_NPS_CMEM16 entry.
* bfd-in2.h: Regenerate.
* libbfd.h: Regenerate.
* elf32-arc.c: Add 'opcode/arc.h' include.
(struct arc_relocation_data): Add symbol_name.
(arc_special_overflow_checks): New function.
(arc_do_relocation): Use arc_special_overflow_checks, reindent as
required, add an extra comment.
(elf_arc_relocate_section): Setup symbol_name in reloc_data.
gas/ChangeLog:
* testsuite/gas/arc/nps400-3.d: New file.
* testsuite/gas/arc/nps400-3.s: New file.
include/ChangeLog:
* elf/arc-reloc.def: Add ARC_NPS_CMEM16 reloc.
* opcode/arc.h (NPS_CMEM_HIGH_VALUE): Define.
ld/ChangeLog:
* testsuite/ld-arc/arc.exp: New file.
* testsuite/ld-arc/nps-1.s: New file.
* testsuite/ld-arc/nps-1a.d: New file.
* testsuite/ld-arc/nps-1b.d: New file.
* testsuite/ld-arc/nps-1b.err: New file.
opcodes/ChangeLog:
* arc-nps400-tbl.h: Add xldb, xldw, xld, xstb, xstw, and xst
instructions.
* arc-opc.c (insert_nps_cmem_uimm16): New function.
(extract_nps_cmem_uimm16): New function.
(arc_operands): Add NPS_XLDST_UIMM16 operand.
In bfd/elf32-arc.c an enum is created that contains entries with generic
names like 'NONE' and 'OFF'. This has been fine for now, but I had a
need to include opcode/arc.h into bfd/elf32-arc.c. Unfortunately
opcode/arc.h includes a different enum with identical generic names.
Given that changing the enum in the header file could mean wide-ranging
changes, while changing the enum in the .c file is limited to only
changing the one file, I've added a prefix to the enum in the .c file.
This commit does not add the new include, that will come later. There
should be no functional change with this commit.
bfd/ChangeLog:
* elf32-arc.c (tls_got_entries): Add 'TLS_GOT_' prefix to all
entries.
(elf_arc_relocate_section): Update enum uses.
(elf_arc_check_relocs): Likewise.
(elf_arc_finish_dynamic_symbol): Likewise.
bfd/
2016-04-05 Cupertino Miranda <cmiranda@synopsys.com>
* elf32-arc.c (name_for_global_symbol): Added assert to check for
symbol index.
(elf_arc_relocate_section): Added and changed asserts, validating
the synamic symbol index.
(elf_arc_finish_dynamic_symbol): Do not fill the dynamic
relocation if symbol has dynindx set to -1.
This commit introduces the nps400 machine type as a variant of arc.
There's a new flag in the assembler to select this machine type. All
other changes are just adding handling of the new machine type into the
relevant places.
The nps400 is an arc700 variant with some vendor specific instructions
added into the instruction set. This commit does not add any of the new
instructions, this is just laying the groundwork for future commits.
However, in preparation for these new instructions a new opcode define for
nps400 has been added to include/opcode/arc.h, this new opcode define is
used in the assembler and disassembler along with the existing define
for arc700 such that when assembling and disassembling for nps400 the
user will have access to all arc700 instructions and all the nps400
vendor extension instructions.
bfd/ChangeLog:
* archures.c (bfd_mach_arc_nps400): Define.
* bfd-in2.h: Regenerate.
* cpu-arc.c (arch_info_struct): New entry for nps400, renumber
some existing entries to make space.
* elf32-arc.c (arc_elf_object_p): Add nps400 case.
(arc_elf_final_write_processing): Likewise.
binutils/ChangeLog:
* readelf.c (decode_ARC_machine_flags): Handle nps400.
gas/ChangeLog:
* config/tc-arc.c (cpu_types): Add nps400 entry.
(check_zol): Handle nps400.
include/ChangeLog:
* elf/arc.h (E_ARC_MACH_NPS400): Define.
* opcode/arc.h (ARC_OPCODE_NPS400): Define.
opcodes/ChangeLog:
* arc-dis.c (print_insn_arc): Handle nps400.
The constant EF_ARC_CPU_GENERIC is defined in the include/elf/arc.h
file, and is used in a few places in binutils, however, this constant
should never make it into the elf header flags; we always set a valid
cpu type in the assembler, which should then be copied over during
linking.
There are some non-gnu arc compilers that don't write an architecture
type into the e_flags field, instead leaving the field as 0, which is
the EF_ARC_CPU_GENERIC value. This non-gnu compiler uses the machine
type to distinguish between the old and newer arc architectures, setting
the machine type to EM_ARC_COMPACT for old arc600, arc601, and arc700
architectures, while using EM_ARC_COMPACT2 for newer arcem and archs
architectures.
Previously when displaying the machine flags for an older EM_ARC_COMPACT
machine, if the e_flags had not been filled in, then we relied on the
default case statement to display the message "Generic ARCompact", while
in the EM_ARC_COMPACT2 case we specifically handled EF_ARC_CPU_GENERIC
to print "ARC Generic", leaving the default case to print a message
about unrecognised cpu flag.
After this commit EF_ARC_CPU_GENERIC has been removed, for both machine
types EM_ARC_COMPACT and EM_ARC_COMPACT2 we now rely on the default case
statement to handle the situation where the e_flags has not been filled
in. The message displayed is now "Unknown ARCompact" (for older arc
architectures) and "Unknown ARC" (for the newer architectures). The
switch from "Generic" to "Unknown" in the message string is for clarity,
calling the file "Generic" can give the impression that the file is
compiled for a common sub-set of the architectures, and would therefore
run on any type of machine (or at least any type of new or old machine
depending on if the machine type is ARC or ARCv2). However, this was
not what "Generic" meant, it really meant "Unknown", so that's what we
now say.
As part of the merging of the readelf flag reading code, I have unified
the strings used in displaying the ELF ABI. This means that for older
arc machines (arc600, arc601, and arc700) the string used for the
original ABI, and ABIv2 have changed, the current ABIv3 remains the
same. For the newer architectures (arcem and archs) the abi strings
remain unchanged in all cases.
bfd/ChangeLog:
* elf32-arc.c (arc_elf_print_private_bfd_data): Remove use of
EF_ARC_CPU_GENERIC.
(arc_elf_final_write_processing): Don't bother setting cpu field
in e_flags, this will have been set elsewhere.
binutils/ChangeLog:
* readelf.c (get_machine_flags): Move arc processing into...
(decode_ARC_machine_flags): ... new function. Remove use of
EF_ARC_CPU_GENERIC, change default case from "generic arc" to
"unknown arc". Merged ABI printing between two machine types.
gas/ChangeLog:
* config/tc-arc.c (arc_select_cpu): Remove use of
EF_ARC_CPU_GENERIC.
include/ChangeLog:
* elf/arc.h (EF_ARC_CPU_GENERIC): Delete. Update related comment.
In the include/elf/arc.h there are two constants that mask out the
machine architecture field. One is used lots (EF_ARC_MACH_MSK), the
other is used only once (EF_ARC_MACH). Remove EF_ARC_MACH.
bfd/ChangeLog:
* elf32-arc.c (arc_elf_final_write_processing): Switch to using
EF_ARC_MACH_MSK.
include/ChangeLog:
* elf/arc.h (EF_ARC_MACH): Delete.
(EF_ARC_MACH_MSK): Remove out of date comment.
bfd/
2016-03-08 Cupertino Miranda <Cupertino.Miranda@synopsys.com>
Andrew Burgess <andrew.burgess@embecosm.com>
* elf32-arc.c (arc_bfd_get_32): Becomes an alias for bfd_get_32.
(arc_bfd_put_32): Becomes an alias for bfd_put_32.
(arc_elf_howto_init): Added assert to validate relocations.
(get_middle_endian_relocation): Delete.
(middle_endian_convert): New function.
(ME): Redefine, now does nothing.
(IS_ME): New define.
(arc_do_relocation): Extend the attached 'ARC_RELOC_HOWTO'
definition to call middle_endian_convert. Add a new local
variable and make use of this throughout. Added call to
arc_bfd_get_8 and arc_bfd_put_8 for 8 bit relocations.
gas/
2016-03-08 Andrew Burgess <andrew.burgess@embecosm.com>
* testsuite/gas/arc/inline-data-1.d: New file.
* testsuite/gas/arc/inline-data-1.s: New file.
include/
2016-03-08 Cupertino Miranda <Cupertino.Miranda@synopsys.com>
Andrew Burgess <andrew.burgess@embecosm.com>
* elf/arc-reloc.def: Add a call to ME within the formula for each
relocation that requires middle-endian correction.
bfd/
2016-02-29 Cupertino Miranda <Cupertino.Miranda@synopsys.com>
* elf32-arc.c (arc_elf_final_write_processing): Add condition to
the flag change.
(elf_arc_relocate_section): Fixes and conditions to support PIE.
Assert for code sections dynamic relocs.
gas/
2016-02-29 Claudiu Zissulescu <Claudiu.Zissulescu@synopsys.com>
* config/tc-arc.c: Enable code density instructions for ARC EM.
ld/
2016-02-29 Cupertino Miranda <Cupertino.Miranda@synopsys.com>
* scripttempl/arclinux.sc: Force .tdata and .tbss to always be
generated.
bfd/ChangeLog:
* arc-plt.def: New file.
* arc-plt.h: Likewise.
* elf32-arc.c (elf_arc_abs_plt0_entry, elf_arc_abs_pltn_entry,
elf_arcV2_abs_plt0_entry, elf_arcV2_abs_pltn_entry,
elf_arc_pic_plt0_entry, elf_arc_pic_pltn_entry,
elf_arcV2_pic_plt0_entry, elf_arcV2_pic_pltn_entry): Remove.
(name_for_global_symbol): Added.
(ADD_RELA): Helper to create dynamic relocs.
(new_got_entry_to_list): Create a new got entry in linked list.
(symbol_has_entry_of_type): Search for specific type of entry in
list.
(is_reloc_for_GOT): return FALSE for any TLS related relocs.
(is_reloc_for_TLS, arc_elf_set_private_flags)
(arc_elf_print_private_bfd_data, arc_elf_copy_private_bfd_data)
(arc_elf_merge_private_bfd_data): New functions.
(debug_arc_reloc): Cleaned debug info printing.
(PDATA reloc): Changed not to perform address alignment.
(reverse_me): Added. Fix for ARC_32 relocs.
(arc_do_relocation): Return bfd_reloc_of when no relocation should
occur.
(arc_get_local_got_ents): Renamed from arc_get_local_got_offsets.
Changed function to access an array of list of GOT entries instead
of just an array of offsets.
(elf_arc_relocate_section): Added support for PIC and TLS related relocations.
(elf_arc_check_relocs): Likewise.
(elf_arc_adjust_dynamic_symbol, elf_arc_finish_dynamic_symbol,
(elf_arc_finish_dynamic_sections): Likewise
(arc_create_dynamic_sections): Modified conditions to create
dynamic sections.
(ADD_SYMBOL_REF_SEC_AND_RELOC): New macro.
(plt_do_relocs_for_symbol, relocate_plt_for_symbol)
(relocate_plt_for_entry): Changed to support new way to define PLT
related code.
(add_symbol_to_plt): Likewise.
(arc_elf_link_hash_table_create): New function.
include/ChangeLog:
* elf/arc-reloc.def (ARC_32, ARC_GOTPC, ARC_TLS_GD_GOT)
(ARC_TLS_IE_GOT, ARC_TLS_DTPOFF, ARC_TLS_DTPOFF_S9, ARC_TLS_LE_S9)
(ARC_TLS_LE_32): Fixed formula.
(ARC_TLS_GD_LD): Use new special function.
* opcode/arc-func.h: Changed all the replacement
functions to clear the patching bits before doing an or it with the value
argument.
The convention within for relocation names is that they start with the
string "R_", however, this is not so for ARC for the display names of
relocations, however, internally, the names for the relocations types do
have the 'R_' prefix. I suspect that the missing 'R_' on the output
strings was an oversight, as I can't see any comment to the contrary.
To bring ARC into line with other targets, this commit adds the 'R_'
prefix to the output strings used for relocation names, and updates all
of the assembler tests where this was exposed.
bfd/ChangeLog:
* elf32-arc.c (reloc_type_to_name): Change ARC_RELOC_HOWTO to
place 'R_' before the reloc name returned.
(elf_arc_howto_table): Change ARC_RELOC_HOWTO to place 'R_' before
the relocation string.
gas/ChangeLog:
* testsuite/gas/arc/adc.d: Add 'R_' prefix to relocation names.
* testsuite/gas/arc/add.d: Likewise.
* testsuite/gas/arc/and.d: Likewise.
* testsuite/gas/arc/asl.d: Likewise.
* testsuite/gas/arc/asr.d: Likewise.
* testsuite/gas/arc/bic.d: Likewise.
* testsuite/gas/arc/extb.d: Likewise.
* testsuite/gas/arc/extw.d: Likewise.
* testsuite/gas/arc/j.d: Likewise.
* testsuite/gas/arc/jl.d: Likewise.
* testsuite/gas/arc/ld2.d: Likewise.
* testsuite/gas/arc/lsr.d: Likewise.
* testsuite/gas/arc/mov.d: Likewise.
* testsuite/gas/arc/or.d: Likewise.
* testsuite/gas/arc/pcl-relocs.d: Likewise.
* testsuite/gas/arc/pcrel-relocs.d: Likewise.
* testsuite/gas/arc/pic-relocs.d: Likewise.
* testsuite/gas/arc/plt-relocs.d: Likewise.
* testsuite/gas/arc/rlc.d: Likewise.
* testsuite/gas/arc/ror.d: Likewise.
* testsuite/gas/arc/rrc.d: Likewise.
* testsuite/gas/arc/sbc.d: Likewise.
* testsuite/gas/arc/sda-relocs.d: Likewise.
* testsuite/gas/arc/sda-relocs2.d: Likewise.
* testsuite/gas/arc/sexb.d: Likewise.
* testsuite/gas/arc/sexw.d: Likewise.
* testsuite/gas/arc/st.d: Likewise.
* testsuite/gas/arc/sub.d: Likewise.
* testsuite/gas/arc/tls-relocs.d: Likewise.
* testsuite/gas/arc/xor.d: Likewise.
* elf32-arc.c (ARC_ELF_HOWTO): Delete.
(arc_elf_howto): New function.
(bfd_elf32_bfd_reloc_type_lookup): Use it in place of existing
init code.
(bfd_elf32_bfd_reloc_name_lookup): Use arc_elf_howto.
(arc_info_to_howto_rel, elf_arc_relocate_section): Likwise.
(elf_arc_check_relocs): Likewise.
This initialises howto.dst_mask so that relocations in debug sections
are applied by the generic reloc processing used by objdump to display
debug sections.
* elf32-arc.c (arc_elf_howto_init): Init dst_mask.
