Use these to replace instances of MAX_REGISTER_SIZE.
* defs.h (copy_integer_to_size): New declaration.
* findvar.c (copy_integer_to_size): New function.
(do_cint_test): New selftest function.
(copy_integer_to_size_test): Likewise.
(_initialize_findvar): Likewise.
* mips-fbsd-tdep.c (mips_fbsd_supply_reg): Use raw_supply_integer.
(mips_fbsd_collect_reg): Use raw_collect_integer.
* mips-linux-tdep.c (supply_32bit_reg): Use raw_supply_integer.
(mips64_fill_gregset): Use raw_collect_integer
(mips64_fill_fpregset): Use raw_supply_integer.
* regcache.c (regcache::raw_supply_integer): New function.
(regcache::raw_collect_integer): Likewise.
* regcache.h: (regcache::raw_supply_integer): New declaration.
(regcache::raw_collect_integer): Likewise.
This patch adds one unit test for gdbarch methods register_to_value and
value_to_register. The test pass different combinations of {regnu, type}
to gdbarch_register_to_value and gdbarch_value_to_register. In order
to do the test, add a new function create_new_frame to create a fake
frame. It can be improved after we converted frame_info to class.
In order to isolate regcache (from target_ops operations on writing
registers, like target_store_registers), the sub-class of regcache in the
test override raw_write. Also, in order to get the right regcache from
get_thread_arch_aspace_regcache, the sub-class of regcache inserts itself
to current_regcache.
Suppose I incorrectly modified the size of buffer as below,
@@ -1228,7 +1228,7 @@ ia64_register_to_value (struct frame_info *frame, int regnum,
int *optimizedp, int *unavailablep)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
- gdb_byte in[MAX_REGISTER_SIZE];
+ gdb_byte in[1];
/* Convert to TYPE. */
if (!get_frame_register_bytes (frame, regnum, 0,
build GDB with "-fsanitize=address" and run unittest.exp, asan can detect
such error
==2302==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff98193870 at pc 0xbd55ea bp 0x7fff981935a0 sp 0x7fff98193598
WRITE of size 16 at 0x7fff98193870 thread T0
#0 0xbd55e9 in frame_register_unwind(frame_info*, int, int*, int*, lval_type*, unsigned long*, int*, unsigned char*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1119
#1 0xbd58c8 in frame_register(frame_info*, int, int*, int*, lval_type*, unsigned long*, int*, unsigned char*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1147
#2 0xbd6e25 in get_frame_register_bytes(frame_info*, int, unsigned long, int, unsigned char*, int*, int*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1427
#3 0x70080a in ia64_register_to_value /home/yao/SourceCode/gnu/gdb/git/gdb/ia64-tdep.c:1236
#4 0xbf570e in gdbarch_register_to_value(gdbarch*, frame_info*, int, type*, unsigned char*, int*, int*) /home/yao/SourceCode/gnu/gdb/git/gdb/gdbarch.c:2619
#5 0xc05975 in register_to_value_test /home/yao/SourceCode/gnu/gdb/git/gdb/gdbarch-selftests.c:131
Or, even if GDB is not built with asan, GDB just crashes.
*** stack smashing detected ***: ./gdb terminated
Aborted (core dumped)
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* Makefile.in (SFILES): Add gdbarch-selftests.c.
(COMMON_OBS): Add gdbarch-selftests.o.
* frame.c [GDB_SELF_TESTS] (create_new_frame): New function.
* frame.h [GDB_SELF_TESTS] (create_new_frame): Declare.
* gdbarch-selftests.c: New file.
* regcache.h (regcache) <~regcache>: Mark it virtual if
GDB_SELF_TEST.
<raw_write>: Likewise.
This patches moves global variable current_regcache to a class regcache
static variable (protected) so that the unit test I add in the following
patch can access it (by means of extending class regcache in unit test).
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* regcache.c (current_regcache): Change it to
regcache::current_regcache.
(regcache_observer_target_changed): Update.
(regcache_thread_ptid_changed): Make it a regcache static
method.
(regcache_thread_ptid_changed): Update.
(class regcache_access): New.
(current_regcache_test): Update.
(_initialize_regcache): Update.
* regcache.h: Include forward_list.
(regcache): Declare regcache_thread_ptid_changed and declare
registers_changed_ptid as friend.
We should use register_size to get register contents instead of
TYPE_LENGTH.
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* i387-tdep.c (i387_register_to_value): Use register_size
instead of TYPE_LENGTH.
* m68k-tdep.c (m68k_register_to_value): Likewise.
This patch restricts alpha_convert_register_p from
"TYPE_LENGTH (type) != 8" to "TYPE_LENGTH (type) == 4", because,
- we have check "TYPE_LENGTH (valtype) == 4" in alpha_register_to_value
and alpha_value_to_register,
- alpha lds and sts instruction access 4 bytes,
- comments "It might need to convert the [float] register into the
corresponding [integer] type (see Alpha)" and integer is 4-byte on
alpha,
I think it is the right restrict condition to "TYPE_LENGTH (valtype) == 4".
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* alpha-tdep.c (alpha_convert_register_p): Return true if type
length is 4.
(alpha_register_to_value): Remove type length check.
(alpha_value_to_register): Likewise.
We need to convert register if the type is float. Suppose we get a value
from float point register, but its type is integer, we don't have to convert.
This case may not exist in real code, but exist in my unit test case.
warning: Cannot convert floating-point register value to non-floating-point type.
Self test failed: arch m68k: self-test failed at gdb/git/gdb/findvar.c:1072
ok = gdbarch_register_to_value (gdbarch, frame, regnum, type,
buf.data (), &optim, &unavail);
1072: SELF_CHECK (ok);
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* m68k-tdep.c (m68k_convert_register_p): Check type's code is
TYPE_CODE_FLT or not.
GDB has some global variables, like sentinel_frame,
current_thread_arch, and etc, we need to reset them after each unit
tests.
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* selftest-arch.c (tests_with_arch): Call registers_changed
and reinit_frame_cache.
* selftest.c (run_self_tests): Likewise.
Nowadays, rs6000 disassembler is selected in different ways in
opcodes and gdb,
opcodes:
case bfd_arch_rs6000:
if (mach == bfd_mach_ppc_620)
disassemble = print_insn_big_powerpc;
else
disassemble = print_insn_rs6000;
break;
gdb:
if (arch == bfd_arch_rs6000)
set_gdbarch_print_insn (gdbarch, print_insn_rs6000);
else
set_gdbarch_print_insn (gdbarch, gdb_print_insn_powerpc);
I am not sure which one is the right one. However, such selection
should be done in one place instead of two.
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* rs6000-tdep.c (gdb_print_insn_powerpc): Remove.
(rs6000_gdbarch_init): Don't call set_gdbarch_print_insn.
This patch changes rl78 to let disassble.c:disassembler select
disassembler. rl78_get_disassembler doesn't handle the case
that abfd is NULL, so this patch also fix it.
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* rl78-tdep.c (rl78_gdbarch_init): Don't call
set_gdbarch_print_insn.
opcodes:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* rl78-dis.c (rl78_get_disassembler): If parameter abfd
is NULL, set cpu to E_FLAG_RL78_ANY_CPU.
opcodes/disassble.c:disassembler select h8300 disassembler like this,
if (mach == bfd_mach_h8300h || mach == bfd_mach_h8300hn)
disassemble = print_insn_h8300h;
else if (mach == bfd_mach_h8300s
|| mach == bfd_mach_h8300sn
|| mach == bfd_mach_h8300sx
|| mach == bfd_mach_h8300sxn)
disassemble = print_insn_h8300s;
else
disassemble = print_insn_h8300;
which is the same as what gdb/h8300-tdpe.c does,
switch (info.bfd_arch_info->mach)
{
case bfd_mach_h8300:
...
set_gdbarch_print_insn (gdbarch, print_insn_h8300);
case bfd_mach_h8300h:
case bfd_mach_h8300hn:
...
set_gdbarch_print_insn (gdbarch, print_insn_h8300h);
case bfd_mach_h8300s:
case bfd_mach_h8300sn:
...
set_gdbarch_print_insn (gdbarch, print_insn_h8300s);
so we can leave disassble.c:disassembler doing the selection.
gdb:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* h8300-tdep.c (h8300_gdbarch_init): Don't call
set_gdbarch_print_insn.
Nowadays, opcodes/disassemble.c:disassembler selects the proper
disassembler according to ABFD only. However, it actually
selects disassemblers according to arch, mach, endianess, and
abfd. This patch adds them to the parameters of disassembler,
so that its caller can still select disassemblers in case that
abfd is NULL (a typical case in GDB).
There isn't any functionality change.
binutils:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* objdump.c (disassemble_data): Caller update.
include:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* dis-asm.h (disassembler): Update declaration.
opcodes:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* disassemble.c (disassembler): Add arguments a, big and mach.
Use them.
sim/common:
2017-05-24 Yao Qi <yao.qi@linaro.org>
* sim-trace.c (trace_disasm): Caller update.
Compare against the "raw" PC register number instead of the cooked
register number when determining if a register was handled by
PT_GETREGS. Previously the register fetch/store operations only tried
PT_GETREGS to fetch any individual register. The result was that
fetching or storing an individual register not covered by PT_GETREGS
(such as floating point registers) did not work.
While here, remove an early exit to simplify the code flow from the
PT_GETREGS / PT_SETREGS case, and add a getfpregs_supplies similar to
getregs_supplies to describe the registers supplied by PT_GETFPREGS
and PT_SETFPREGS.
gdb/ChangeLog:
* mips-fbsd-nat.c (getregs_supplies): Fix upper bound comparison.
(getpfpregs_supplies): New function.
(mips_fbsd_fetch_inferior_registers): Remove early exit and use
getfpregs_supplies.
(mips_fbsd_store_inferior_registers): Likewise.
It is required to parse instructions like ldb.x.a.di.
include/
2017-05-23 Claudiu Zissulescu <claziss@synopsys.com>
* opcode/arc.h (MAX_INSN_FLGS): Update to 4.
Add mention of the vMustReplyEmpty to the remote serial protocol
documentation. It is important that this packet be treated in the same
fashion as any other unknown 'v' packet, and I have tried to reflect
this in the description of the packet, it is not simply the case that we
_must_ return the empty string for this packet.
As the intention is that we should treat this packet as unknown then an
argument could be made that we should not document it, however, for
someone implementing a gdbserver from scratch, seeing an undocumented
packet arrive from gdb is confusing, and will probably cause them to
have to read the code in order to check how this packet should be
handled, which is not ideal.
gdb/doc/ChangeLog:
* gdb.texinfo (Packets): Document vMustReplyEmpty packet.
This patch allows AArch64 LD defaulting to ILP32 if it is configured with
aarch64*-linux-gnu_ilp32.
ld/
* configure.tgt: Set "targ_emul" to "aarch64linux32b" for
aarch64_be-*-linux-gnu_ilp32. Set "targ_emul" to "aarch64linux32" for
aarch64-*-linux-gnu_ilp32.
This patch allows AArch64 GAS defaulting to ILP32 if it is configured with
aarch64*-linux-gnu_ilp32.
"md_after_parse_args" is implemented to update ABI into ILP32 if DEFAULT_ARCH is
"aarch64:32".
gas/
* configure.tgt: Set "arch" to "aarch64" if ${cpu} equals "aarch64".
Recognize the new triplet name aarch64*-linux-gnu_ilp32.
* configure.ac: Output DEFAULT_ARCH macro for AArch64.
* configure: Regenerate.
* config/tc-aarch64.h (aarch64_after_parse_args): New declaration.
(md_after_parse_args): New define.
* config/tc-aarch64.c (aarch64_abi_type): New enumeration
AARCH64_ABI_NONE.
(DEFAULT_ARCH): New define.
(aarch64_abi): Set default value to AARCH64_ABI_NONE.
(aarch64_after_parse_args): New function.
It's a bit difficult to create an unsized array type in Rust, but if
you do, right now ptype will show something like "[u8; ]". It really
should print "[u8]", though, which is what this patch implements.
This is part of PR 21466.
Built and regtested on x86-64 Fedora 25. I'm checking this in.
ChangeLog
2017-05-21 Tom Tromey <tom@tromey.com>
PR rust/21466:
* rust-lang.c (rust_print_type) <TYPE_CODE_ARRAY>: Print unsized
arrays as "[T]", not "[T; ]".
testsuite/ChangeLog
2017-05-21 Tom Tromey <tom@tromey.com>
PR rust/21466:
* gdb.rust/unsized.exp: New file.
* gdb.rust/unsized.rs: New file.
This patch removes a workaround recently installed in objcopy that
avoided removing duplicated notes in targets for which the number of
internal relocations may be bigger than the number of external
relocations. With the recent fixes in sparc64 and mips64, this
workaround is no longer necessary.
2017-05-19 Jose E. Marchesi <jose.marchesi@oracle.com>
* objcopy.c (merge_gnu_build_notes): Remove workaround that
prevented deleting relocations in duplicated notes in mips64 and
sparc.
PR rust/21484 notes that watch -location does not work with Rust:
(gdb) watch -location a
syntax error in expression, near `) 0x00007fffffffe0f4'.
update_watchpoint tries to tell gdb that the new expression it creates
has C syntax:
/* The above expression is in C. */
b->language = language_c;
However, update_watchpoint doesn't actually use this language when
re-parsing the expression.
Originally I was going to fix this by saving and restoring the
language in update_watchpoint, but this regressed
gdb.dlang/watch-loc.exp, because the constructed expression actually
has D syntax (specifically the name is not parseable by C).
Next I looked at directly constructing an expression, and not relying
on the parser at all; but it seemed to me that upon a re-set, we'd
want to reparse the type, and there is no existing API to do this
correctly.
So, in the end I made a hook to let each language choose what
expression to use. I made all the languages other than Rust use the C
expression, because that is the status quo ante. However, this is
probably not truly correct. After this patch, at least, it is easy to
correct by someone who knows the language(s) in question.
Regtested by the buildbot.
ChangeLog
2017-05-19 Tom Tromey <tom@tromey.com>
PR rust/21484:
* rust-lang.c (exp_descriptor_rust): New function.
(rust_language_defn): Use it.
* p-lang.c (pascal_language_defn): Update.
* opencl-lang.c (opencl_language_defn): Update.
* objc-lang.c (objc_language_defn): Update.
* m2-lang.c (m2_language_defn): Update.
* language.h (struct language_defn)
<la_watch_location_expression>: New member.
* language.c (unknown_language_defn, auto_language_defn)
(local_language_defn): Update.
* go-lang.c (go_language_defn): Update.
* f-lang.c (f_language_defn): Update.
* d-lang.c (d_language_defn): Update.
* c-lang.h (c_watch_location_expression): Declare.
* c-lang.c (c_watch_location_expression): New function.
(c_language_defn, cplus_language_defn, asm_language_defn)
(minimal_language_defn): Use it.
* breakpoint.c (watch_command_1): Call
la_watch_location_expression.
* ada-lang.c (ada_language_defn): Update.
testsuite/ChangeLog
2017-05-19 Tom Tromey <tom@tromey.com>
PR rust/21484:
* gdb.rust/watch.exp: New file.
* gdb.rust/watch.rs: New file.
Revert parts of commit fee24f1c5b ("objdump improvements for mips
elf64"), <https://sourceware.org/ml/binutils/2003-03/msg00108.html>, and
make the `->reloc_count' member of `struct bfd_section' hold the actual
number of internal relocations stored in its `->relocation' vector. To
do so adjust `mips_elf64_slurp_one_reloc_table' to set `->reloc_count'
to the actual number of internal relocations retrieved and discard
`mips_elf64_canonicalize_reloc', `mips_elf64_canonicalize_dynamic_reloc'
and their corresponding target macros. Contrary to the description of
`mips_elf64_slurp_one_reloc_table', adjusted appropriately, this makes
generic relocation processing code happy and satisfies the "merge notes
section" binutils test case.
Add extra binutils test cases to expand the coverage of the generic
"merge notes section" test case, now passing with the n64 ABI, across
the MIPS o32, n32 and n64 ABIs regardless of the default ABI selected in
target configuration, and also to verify correctness of the relocations
produced. Conversely, do not provide any additional test cases for the
original issue addressed with the commit referred:
- objdump would display only 1/3 of the total number of relocations,
because it used the external relocation count, but each external
relocation is brought in as 3 internal relocations.
as n64 ABI relocation processing with `objdump -r' and `objdump -R' is
already widely covered across the GAS and LD test suites.
bfd/
* elf64-mips.c (mips_elf64_canonicalize_reloc): Remove prototype
and function.
(mips_elf64_canonicalize_dynamic_reloc): Likewise.
(mips_elf64_slurp_one_reloc_table): Set `reloc_count' to the
actual number of internal relocations retrieved. Adjust
function description.
(bfd_elf64_canonicalize_reloc): Remove macro.
(bfd_elf64_canonicalize_dynamic_reloc): Likewise.
binutils/
* testsuite/binutils-all/mips/mips-note-2.d: New test.
* testsuite/binutils-all/mips/mips-note-2r.d: New test.
* testsuite/binutils-all/mips/mips-note-2-n32.d: New test.
* testsuite/binutils-all/mips/mips-note-2-n64.d: New test.
* testsuite/binutils-all/mips/mips-note-2r-n32.d: New test.
* testsuite/binutils-all/mips/mips-note-2r-n64.d: New test.
* testsuite/binutils-all/mips/mips.exp: Define `has_newabi'.
Run the new tests.
Verify that debug section is removed by garbage collection when there
is a .note.gnu.property section.
* testsuite/ld-i386/i386.exp: Run property-x86-4a and
property-x86-4b.
* testsuite/ld-x86-64/x86-64.exp: Likewise.
* testsuite/ld-i386/property-x86-4a.d: New file.
* testsuite/ld-i386/property-x86-4a.s: Likewise.
* testsuite/ld-i386/property-x86-4b.d: Likewise.
* testsuite/ld-i386/property-x86-4b.s: Likewise.
* testsuite/ld-x86-64/property-x86-4a.d: Likewise.
* testsuite/ld-x86-64/property-x86-4a.s: Likewise.
* testsuite/ld-x86-64/property-x86-4b.d: Likewise.
* testsuite/ld-x86-64/property-x86-4b.s: Likewise.
Tested in targets:
sparc-aout sparc-linux sparc-vxworks sparc64-linux
2017-05-19 Jose E. Marchesi <jose.marchesi@oracle.com>
* testsuite/gas/sparc/call-relax.d: Support 32-bit targets.
* testsuite/gas/sparc/sparc.exp (gas_64_check): Use -64 to
run asi-bump-warn.
PR ld/21472
ld * emulparams/avrxmega3.sh (RODATA_PM_OFFSET): Set to 0x8000.
* scripttempl/avr.sc
(__RODATA_PM_OFFSET__) [RODATA_PM_OFFSET]: Use RODATA_PM_OFFSET
as default if not already defined.
(.data) [!RODATA_PM_OFFSET]: Don't include .rodata and friends.
(.rodata) [RODATA_PM_OFFSET]: Put at an offset of
__RODATA_PM_OFFSET__.
gas * config/tc-avr.c (mcu_types): Add entries for: attiny416,
attiny417, attiny816, attiny817.
On both mainline and the 8.0 branch, gdb compilation fails on Solaris 10
with the native libcurses like this:
In file included from /vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/gdb_curses.h:42:
0,
from /vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-data.h:2
6,
from /vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-disasm.c
:31:
/vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-disasm.c: In function `CORE_A
DDR tui_disassemble(gdbarch*, tui_asm_line*, CORE_ADDR, int)':
/vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-disasm.c:71:19: error: `class
string_file' has no member named `wclear'; did you mean `clear'?
gdb_dis_out.clear ();
^
/vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-disasm.c:78:19: error: `class
string_file' has no member named `wclear'; did you mean `clear'?
gdb_dis_out.clear ();
^
make[2]: *** [Makefile:1927: tui-disasm.o] Error 1
It turned out this happens because <curses.h> has
#define clear() wclear(stdscr)
This can be avoided by defining NOMACROS, which the patch below does.
ncurses potentially has a similar problem, which can be avoided by defining
NCURSES_NOMACROS.
PR tui/21482
* gdb_curses.h (NOMACROS): Define.
(NCURSES_NOMACROS): Define.
On both mainline and the 8.0 branch, gdb compilation fails on Solaris 10
with the native libcurses in gdb/tui for several instances of the same problem:
/vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-winsource.c: In function `void tui_erase_source_content(tui_win_info*, int)':
/vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-winsource.c:257:18: error: invalid conversion from `const char*' to `char*' [-fpermissive]
no_src_str);
^
In file included from /vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/gdb_curses.h:42:0,
from /vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-data.h:26,
from /vol/src/gnu/gdb/gdb-8.0-branch/local/gdb/tui/tui-winsource.c:33:
/vol/gcc-7/lib/gcc/sparc-sun-solaris2.10/7.1.0/include-fixed/curses.h:699:12: note: initializing argument 4 of `int mvwaddstr(WINDOW*, int, int, char*)'
extern int mvwaddstr(WINDOW *, int, int, char *);
^~~~~~~~~
make[2]: *** [Makefile:1927: tui-winsource.o] Error 1
Unlike ncurses, <curses.h> declares
extern int mvwaddstr(WINDOW *, int, int, char *);
i.e. the last arg is char *, not const char *.
The patch fixes this by casting the last arg to mvwaddstr to char *,
as was recently done on mainline in a newterm() call (the only
difference between 8.0 and mainline gdb/tui).
* tui/tui-windata.c (tui_erase_data_content): Cast last mvwaddstr
arg to char *.
* tui/tui-wingeneral.c (box_win): Likewise.
* tui/tui-winsource.c (tui_erase_source_content): Likewise.
(tui_show_source_line): Likewise.
(tui_show_exec_info_content): Likewise.
gdb has a special type (TYPE_CODE_ARRAY) to support the gcc extension
(https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html).
TYPE_CODE_ARRAY is handled incorrectly for both (32- and 64-bit) modes
on Sparc machines.
Tested on sparc64-linux-gnu and sparc-solaris (32- and 64-bit mode).
6 tests ( from gdb/testsuite/gdb.base/gnu_vector.exp) failed on
sparc64-Linux and on sparc-Solaris in 32- and 64-bit mode. Now all
these tests passed. gdb/testsuite/gdb.base/gnu_vector.exp has 117
different cases for small (and not small) arrays and structures.
No regressions.
gdb/ChangeLog:
2017-05-19 Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
* sparc-tdep.c (sparc_structure_return_p)
(sparc_arg_on_registers_p): New functions.
(sparc32_store_arguments): Use them.
* sparc64-tdep.c (sparc64_16_byte_align_p)
(sparc64_store_floating_fields, sparc64_extract_floating_fields):
Handle TYPE_CODE_ARRAY.
The pr20882 testcase fails on a number of targets that add attribute
or note sections to object files, and the default linker script says
those sections should be kept. This patch changes --gc-sections to
drop debug and special sections like .comment when no SEC_ALLOC
section in an object file is kept. The assumption is that debug
sections are describing code and data that will become part of the
final image in memory.
* elflink.c (_bfd_elf_gc_mark_extra_sections): Don't keep
debug and special sections when no non-note alloc sections in an
object are kept.
