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Tom de Vries noticed that a patch in the DWARF scanner rewrite series
caused a regression in parallel_for_each -- it started crashing in the
case where the number of threads is 0 (there was an unchecked use of
"n-1" that was used to size an array).
He also pointed out that there were no tests of parallel_for_each.
This adds a few tests of parallel_for_each, primarily testing that
different settings for the number of threads will work. This test
catches the bug that he found in that series.
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I wanted to see how many threads gdb thought it was using, but
"maint show worker-threads" only reported "unlimited". This patch
adds a show function so that it will now report the number of threads
gdb has started.
Regression tested on x86-64 Fedora 34.
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With current gdb we run into:
...
$ gdb -batch '' ''
: No such file or directory.
pathstuff.cc:132: internal-error: \
gdb::unique_xmalloc_ptr<char> gdb_abspath(const char*): \
Assertion `path != NULL && path[0] != '\0'' failed.
...
Fix this by skipping the call to gdb_abspath in core_target_open in the
empty-string case, such that we have instead:
...
$ gdb -batch '' ''
: No such file or directory.
: No such file or directory.
$
...
Tested on x86_64-linux.
gdb/ChangeLog:
2021-08-30 Tom de Vries <tdevries@suse.de>
PR cli/28290
* gdb/corelow.c (core_target_open): Skip call to gdb_abspath in the
empty-string case.
gdb/testsuite/ChangeLog:
2021-08-30 Tom de Vries <tdevries@suse.de>
PR cli/28290
* gdb.base/batch-exit-status.exp: Add gdb '' and gdb '' '' tests.
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Similar to ARM/AARCH64, we add mapping symbols in the symbol table,
to mark the start addresses of data and instructions. The $d means
data, and the $x means instruction. Then the disassembler uses these
symbols to decide whether we should dump data or instruction.
Consider the mapping-04 test case,
$ cat tmp.s
.text
.option norelax
.option norvc
.fill 2, 4, 0x1001
.byte 1
.word 0
.balign 8
add a0, a0, a0
.fill 5, 2, 0x2002
add a1, a1, a1
.data
.word 0x1 # No need to add mapping symbols.
.word 0x2
$ riscv64-unknown-elf-as tmp.s -o tmp.o
$ riscv64-unknown-elf-objdump -d tmp.o
Disassembly of section .text:
0000000000000000 <.text>:
0: 00001001 .word 0x00001001 # Marked $d, .fill directive.
4: 00001001 .word 0x00001001
8: 00000001 .word 0x00000001 # .byte + part of .word.
c: 00 .byte 0x00 # remaining .word.
d: 00 .byte 0x00 # Marked $d, odd byte of alignment.
e: 0001 nop # Marked $x, nops for alignment.
10: 00a50533 add a0,a0,a0
14: 20022002 .word 0x20022002 # Marked $d, .fill directive.
18: 20022002 .word 0x20022002
1c: 2002 .short 0x2002
1e: 00b585b3 add a1,a1,a1 # Marked $x.
22: 0001 nop # Section tail alignment.
24: 00000013 nop
* Use $d and $x to mark the distribution of data and instructions.
Alignments of code are recognized as instructions, since we usually
fill nops for them.
* If the alignment have odd bytes, then we cannot just fill the nops
into the spaces. We always fill an odd byte 0x00 at the start of
the spaces. Therefore, add a $d mapping symbol for the odd byte,
to tell disassembler that it isn't an instruction. The behavior
is same as Arm and Aarch64.
The elf/linux toolchain regressions all passed. Besides, I also
disable the mapping symbols internally, but use the new objudmp, the
regressions passed, too. Therefore, the new objudmp should dump
the objects corretly, even if they don't have any mapping symbols.
bfd/
pr 27916
* cpu-riscv.c (riscv_elf_is_mapping_symbols): Define mapping symbols.
* cpu-riscv.h: extern riscv_elf_is_mapping_symbols.
* elfnn-riscv.c (riscv_maybe_function_sym): Do not choose mapping
symbols as a function name.
(riscv_elf_is_target_special_symbol): Add mapping symbols.
binutils/
pr 27916
* testsuite/binutils-all/readelf.s: Updated.
* testsuite/binutils-all/readelf.s-64: Likewise.
* testsuite/binutils-all/readelf.s-64-unused: Likewise.
* testsuite/binutils-all/readelf.ss: Likewise.
* testsuite/binutils-all/readelf.ss-64: Likewise.
* testsuite/binutils-all/readelf.ss-64-unused: Likewise.
gas/
pr 27916
* config/tc-riscv.c (make_mapping_symbol): Create a new mapping symbol.
(riscv_mapping_state): Decide whether to create mapping symbol for
frag_now. Only add the mapping symbols to text sections.
(riscv_add_odd_padding_symbol): Add the mapping symbols for the
riscv_handle_align, which have odd bytes spaces.
(riscv_check_mapping_symbols): Remove any excess mapping symbols.
(md_assemble): Marked as MAP_INSN.
(riscv_frag_align_code): Marked as MAP_INSN.
(riscv_init_frag): Add mapping symbols for frag, it usually called
by frag_var. Marked as MAP_DATA for rs_align and rs_fill, and
marked as MAP_INSN for rs_align_code.
(s_riscv_insn): Marked as MAP_INSN.
(riscv_adjust_symtab): Call riscv_check_mapping_symbols.
* config/tc-riscv.h (md_cons_align): Defined to riscv_mapping_state
with MAP_DATA.
(TC_SEGMENT_INFO_TYPE): Record mapping state for each segment.
(TC_FRAG_TYPE): Record the first and last mapping symbols for the
fragments. The first mapping symbol must be placed at the start
of the fragment.
(TC_FRAG_INIT): Defined to riscv_init_frag.
* testsuite/gas/riscv/mapping-01.s: New testcase.
* testsuite/gas/riscv/mapping-01a.d: Likewise.
* testsuite/gas/riscv/mapping-01b.d: Likewise.
* testsuite/gas/riscv/mapping-02.s: Likewise.
* testsuite/gas/riscv/mapping-02a.d: Likewise.
* testsuite/gas/riscv/mapping-02b.d: Likewise.
* testsuite/gas/riscv/mapping-03.s: Likewise.
* testsuite/gas/riscv/mapping-03a.d: Likewise.
* testsuite/gas/riscv/mapping-03b.d: Likewise.
* testsuite/gas/riscv/mapping-04.s: Likewise.
* testsuite/gas/riscv/mapping-04a.d: Likewise.
* testsuite/gas/riscv/mapping-04b.d: Likewise.
* testsuite/gas/riscv/mapping-norelax-04a.d: Likewise.
* testsuite/gas/riscv/mapping-norelax-04b.d: Likewise.
* testsuite/gas/riscv/no-relax-align.d: Updated.
* testsuite/gas/riscv/no-relax-align-2.d: Likewise.
include/
pr 27916
* opcode/riscv.h (enum riscv_seg_mstate): Added.
opcodes/
pr 27916
* riscv-dis.c (last_map_symbol, last_stop_offset, last_map_state):
Added to dump sections with mapping symbols.
(riscv_get_map_state): Get the mapping state from the symbol.
(riscv_search_mapping_symbol): Check the sorted symbol table, and
then find the suitable mapping symbol.
(riscv_data_length): Decide which data size we should print.
(riscv_disassemble_data): Dump the data contents.
(print_insn_riscv): Handle the mapping symbols.
(riscv_symbol_is_valid): Marked mapping symbols as invalid.
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The current syntax of proc arange is:
...
proc arange { arange_start arange_length {comment ""} {seg_sel ""} } {
...
and a typical call looks like:
...
arange $start $len
...
This style is somewhat annoying because if you want to specify the last
parameter, you need to give the default values of all the other optional ones
before as well:
...
arange $start $len "" $seg_sel
...
Update the syntax to:
...
proc arange { options arange_start arange_length } {
parse_options {
{ comment "" }
{ seg_sel "" }
}
...
such that a typical call looks like:
...
arange {} $start $len
...
and a call using seg_sel looks like:
...
arange {
seg_sel $seg_sel
} $start $len
...
Also update proc aranges, which already has an options argument, to use the
new proc parse_options.
Tested on x86_64-linux.
Co-Authored-By: Simon Marchi <simon.marchi@polymtl.ca>
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bfd/
PR ld/28264
* elflink.c (_bfd_elf_merge_symbol): Change indirect symbol from
IR to undefined.
ld/
PR ld/28264
* testsuite/ld-plugin/lto.exp: Run PR ld/28264 test.
* testsuite/ld-plugin/pr28264-1.d: New file.
* testsuite/ld-plugin/pr28264-2.d: Likewise.
* testsuite/ld-plugin/pr28264-3.d: Likewise.
* testsuite/ld-plugin/pr28264-4.d: Likewise.
* testsuite/ld-plugin/pr28264.c: Likewise.
* testsuite/ld-plugin/pr28264.ver: Likewise.
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PR 28264
PR 26978
* linker.c (_bfd_generic_link_add_one_symbol <MIND>): Check
that string is non-NULL.
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When comparing the sizes of the index files generated for shlib
outputs/gdb.dwarf2/dw2-zero-range/shr1.sl, I noticed a large difference
between .debug_names:
...
$ gdb -q -batch $shlib -ex "save gdb-index -dwarf-5 ."
$ du -b -h shr1.sl.debug_names shr1.sl.debug_str
61 shr1.sl.debug_names
0 shr1.sl.debug_str
...
and .gdb_index:
...
$ gdb -q -batch $shlib -ex "save gdb-index ."
$ du -b -h shr1.sl.gdb-index
8.2K shr1.sl.gdb-index
...
The problem is that the .gdb_index contains a non-empty symbol table with only
empty entries.
Fix this by making the symbol table empty, such that we have instead:
...
$ du -b -h shr1.sl.gdb-index
184 shr1.sl.gdb-index
...
Tested on x86_64-linux.
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Before commit 5ef670d81fd "[gdb/testsuite] Add dummy start and end CUs in
dwarf assembly" we had in exec outputs/gdb.dlang/watch-loc/watch-loc a D
compilation unit at offset 0xc7:
...
Compilation Unit @ offset 0xc7:
Length: 0x4c (32-bit)
Version: 4
Abbrev Offset: 0x64
Pointer Size: 8
<0><d2>: Abbrev Number: 2 (DW_TAG_compile_unit)
<d3> DW_AT_language : 19 (D)
...
with a corresponding .debug_aranges entry:
...
Offset into .debug_info: 0xc7
Pointer Size: 4
Segment Size: 0
Address Length
004004a7 0000000b
00000000 00000000
...
After that commit we have a dummy CU at offset 0xc7 and the D compilation unit
at offset 0xd2:
...
Compilation Unit @ offset 0xc7:
Length: 0x7 (32-bit)
Version: 4
Abbrev Offset: 0x64
Pointer Size: 8
Compilation Unit @ offset 0xd2:
Length: 0x4c (32-bit)
Version: 4
Abbrev Offset: 0x65
Pointer Size: 8
<0><dd>: Abbrev Number: 2 (DW_TAG_compile_unit)
<de> DW_AT_language : 19 (D)
...
while the .debug_aranges entry still points to 0xc7.
The problem is that the test-case uses a hack (quoting from
commit 75f06e9dc59):
...
[ Note: this is a non-trivial test-case. The file watch-loc-dw.S contains a
.debug_info section, but not an .debug_aranges section or any actual code.
The file watch-loc.c contains code and a .debug_aranges section, but no other
debug section. So, the intent for the .debug_aranges section in watch-loc.c
is to refer to a compilation unit in the .debug_info section in
watch-loc-dw.S. ]
...
and adding the dummy CU caused that hack to stop working.
Fix this by moving the generation of .debug_aranges from watch-loc.c to
watch-loc.exp, such that we have:
...
Offset into .debug_info: 0xd2
Pointer Size: 4
Segment Size: 0
Address Length
004004a7 0000000b
00000000 00000000
...
Tested on x86_64-linux.
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A best practise for DWARF [1] is to generate .debug_aranges entries for CUs
even if they have no address range.
Generate .debug_arange entries for the dummy CUs added by the DWARF assembler.
Tested on x86_64-linux.
[1] http://wiki.dwarfstd.org/index.php?title=Best_Practices
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A couple of test-cases fail when run with target board cc-with-debug-names due
to missing .debug_aranges entries for the CUs added by the dwarf assembler.
Add a .debug_aranges entry for those CUs.
Tested on x86_64-linux.
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Add a proc aranges such that we can generate .debug_aranges sections in dwarf
assembly using:
...
cu { label cu_label } {
...
}
aranges {} cu_label {
arange $addr $len [<comment>] [$segment_selector]
}
...
Tested on x86_64-linux.
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We can use current dwarf assembly infrastructure to declare a label that marks
the start of the CU header:
...
declare_labels header_start_cu_a
_section ".debug_info"
header_start_cu_a : cu {} {
}
_section ".debug_info"
header_start_cu_b : cu {} {
}
...
on the condition that we switch to the .debug_info section before, which makes
this style of use fragile.
Another way to achieve the same is to use the label as generated by the cu
proc itself:
...
variable _cu_label
cu {} {
}
set header_start_cu_a $_cu_label
cu {} {
}
set header_start_cu_b $_cu_label
...
but again that seems fragile given that adding a new CU inbetween will
silently result in the wrong value for the label.
Add a label option to proc cu such that we can simply do:
...
cu { label header_start_cu_a } {
}
cu { label header_start_cu_b } {
}
...
Tested on x86_64-linux.
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I spotted a couple of stray newlines that were left at the end of
debug message during conversion to the new debug output scheme. These
messages are part of the 'set debug lin-lwp 1' output.
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PR symtab/28160 and PR symtab/27893 concern GDB crashes in the test
suite when using the "fission" target board. They are both caused by
the patches that merge the list of CUs with the list of TUs (and to a
lesser degree by the patches to share DWARF data across objfiles), and
the underlying issue is the same: it turns out that reading a DWO can
cause new type units to be created. This means that the list of
dwarf2_per_cu_data objects depends on precisely which CUs have been
expanded. However, because the type units can be created while
expanding a CU means that the vector of CUs can expand while it is
being iterated over -- a classic mistake. Also, because a TU can be
added later, it means the resize_symtabs approach is incorrect.
This patch fixes resize_symtabs by removing it, and having set_symtab
resize the vector on demand. It fixes the iteration problem by
introducing a safe (index-based) iterator and changing the relevant
spots to use it.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28160
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27893
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* testsuite/lib/ld-lib.exp (run_host_cmd): Give a clue as to why
gcc -B doesn't pick up the ld under test.
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FAIL: objdump -S
FAIL: objdump --source-comment
is seen on mingw for the simple reason that gcc adds a .exe suffix on
the output file if not already present. Fix that, and tidy some objcopy
tests.
* testsuite/lib/binutils-common.exp (exeext): New proc.
* testsuite/binutils-all/objcopy.exp (exe, test_prog): Use it here.
(objcopy_remove_relocations_from_executable): Catch objcopy errors.
Only run on ELF targets.
* testsuite/binutils-all/objdump.exp (exe): Set variable.
(test_build_id_debuglink, test_objdump_S): Use exe file suffix.
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The function ft32_opcode used recursion. This could cause a stack
overflow. Replaced with a pair of non-recursive functions.
PR 28169
* ft32-dis.c: Formatting.
(ft32_opcode1): Split out from..
(ft32_opcode): ..here.
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dw2-ranges-overlap.exp creates a program where a psymtab has two
address ranges, and a function without debug info whose address is
between these two ranges. Then it sets a breakpoint on this function
and runs to it, expecting that the language should remain "auto; c"
when stopped.
However, this test case also has a "main" function described (briefly)
in the DWARF, and this function is given language C++. Also, a
breakpoint stop sets the current language to the language that was
used when setting the breakpoint.
My new DWARF scanner decides that this "main" is the main program and
sets the current language to C++ at startup, causing this test to
fail.
This patch fixes the test in a simple way, by introducing a new
function that takes the place of "main" in the DWARF. I think this
still exercises the original problem, but also avoids problems with my
branch.
It seemed safe to me to submit this separately.
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With trying to load a non-executable file into gdb, we run into PR26880:
...
$ gdb -q -batch test.c
"0x7ffc87bfc8d0s": not in executable format: \
file format not recognized
...
The problem is caused by using %ps in combination with the error function
(note that confusingly, it does work in combination with the warning
function).
Fix this by using plain "%s" instead.
Tested on x86_64-linux.
gdb/ChangeLog:
2021-08-22 Tom de Vries <tdevries@suse.de>
PR gdb/26880
* gdb/exec.c (exec_file_attach): Use %s instead of %ps in call to
error function.
gdb/testsuite/ChangeLog:
2021-08-22 Tom de Vries <tdevries@suse.de>
PR gdb/26880
* gdb.base/non-executable.exp: New file.
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The test-case gdb.dwarf2/dw2-ranges.exp is the only one in the gdb testsuite
that uses gas-generated stabs.
While the use seems natural alongside the use of gas-generated dwarf in the
same test-case, there are a few known issues, filed on the gdb side as:
- PR symtab/12497 - "stabs: PIE relocation does not work"
- PR symtab/28221 - "[readnow, stabs] FAIL: gdb.dwarf2/dw2-ranges.exp: \
info line func"
and on the gas side as:
- PR gas/28233 - "[gas, --gstabs] Generate stabs more similar to gcc"
The test-case contains a KFAIL for PR12497, but it's outdated and fails to
trigger.
The intention of the test-case is to test gas-generated dwarf, and using
gcc-generated stabs instead of gas-generated stabs works fine.
Supporting compiler-generated stabs is already a corner-case for gdb, and
there's no current commitment/incentive to support/workaround gas-generated
stabs, which can be considered a corner-case of a corner-case.
Work around these problem by using compiler-generated stabs in the test-case.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-22 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/dw2-ranges.exp: Use compiler-generated stabs.
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Say one compiles a hello.c:
...
$ gcc -g hello.c
...
On openSUSE Leap 15.2 and Tumbleweed, the CU for hello.c is typically not the
first in .debug_info, nor the last, due to presence of debug information in
objects for sources like:
- ../sysdeps/x86_64/start.S
- init.c
- ../sysdeps/x86_64/crti.S
- elf-init.c
- ../sysdeps/x86_64/crtn.S.
On other systems, say ubuntu 18.04.5, the CU for hello.c is typically the
first and the last in .debug_info.
This difference has caused me to find some errors in the dwarf assembly
using openSUSE, that didn't show up on other platforms.
Force the same situation on other platforms by adding a dummy start
and end CU.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-22 Tom de Vries <tdevries@suse.de>
PR testsuite/28235
* lib/dwarf.exp (Dwarf::dummy_cu): New proc.
(Dwarf::assemble): Add dummy start and end CU.
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When running test-case gdb.dwarf2/dw2-ranges-psym.exp with target board
-readnow, I run into:
...
(gdb) file dw2-ranges-psym^M
Reading symbols from dw2-ranges-psym...^M
Expanding full symbols from dw2-ranges-psym...^M
(gdb) set complaints 0^M
(gdb) FAIL: gdb.dwarf2/dw2-ranges-psym.exp: No complaints
...
The problem is that the regexp expects a gdb prompt immediately after the
"Reading symbols" line.
Fix this by updating the regexp.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-22 Tom de Vries <tdevries@suse.de>
* lib/gdb.exp (gdb_load_no_complaints): Update regexp to allow
"Expanding full symbols" Line.
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The m32r Linux syscall emulation logic assumes the host environment
directly matches -- it's being run on 32-bit little endian Linux.
This breaks building for non-Linux systems, so put all the code in
__linux__ ifdef checks. This code needs a lot of love to make it
work everywhere, but let's at least unbreak it for non-Linux hosts.
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In preparation for this script generating more files, change the output
argument to specify a directory. This drops the stdout behavior, but
since no one really runs this tool directly, it's not a big deal.
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Trivial patch to use bool instead of int.
Change-Id: I9e5f8ee4305272a6671cbaaaf2f0484eff0d1ea5
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Put back 3 aborts where invalid lengths should have been filtered out.
gas/
PR binutils/28247
* testsuite/gas/i386/bad-bcast.s: Add a comment.
opcodes/
PR binutils/28247
* * i386-dis.c (OP_E_memory): Put back 3 aborts.
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Print "{bad}" on invalid broadcast instead of abort.
gas/
PR binutils/28247
* testsuite/gas/i386/bad-bcast.d: New file.
* testsuite/gas/i386/bad-bcast.s: Likewise.
* testsuite/gas/i386/i386.exp: Run bad-bcast.
opcodes/
PR binutils/28247
* i386-dis.c (OP_E_memory): Print "{bad}" on invalid broadcast
instead of abort.
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scan_dyntag is unnecessarily duplicated in solib-svr4.c and solib-dsbt.c.
Move this function to solib.c and rename it to gdb_bfd_scan_elf_dyntag.
Also add it to solib.h so it is included in both solib-svr4 and solib-dsbt.
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Add a method to set the gcc target options for the ppc64 targets.
This change sets an empty value, which allows the gcc
default values (-mcmodel=medium) be used, instead of -mcmodel=large
which is set by the default_gcc_target_options hook.
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Add methods to set the target triplet so we can
find the proper gcc when our gcc is named of
the form powerpc64{le}-<foo>-gcc or ppc64{le}-<foo>-gcc.
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Some targets, typically embedded without shared libraries, replace the
relocation symbol with a section symbol (see tc_fix_adjustable).
Allow the test to pass for such targets. Fixes the following.
avr-elf +FAIL: symver symver16
d10v-elf +FAIL: symver symver16
dlx-elf +FAIL: symver symver16
ip2k-elf +FAIL: symver symver16
m68k-elf +FAIL: symver symver16
mcore-elf +FAIL: symver symver16
pj-elf +FAIL: symver symver16
s12z-elf +FAIL: symver symver16
visium-elf +FAIL: symver symver16
z80-elf +FAIL: symver symver16
PR gas/28157
* testsuite/gas/symver/symver16.d: Relax reloc match.
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Fixes a silly mistake in calculating the address of -Os out-of-line
register save/restore function copies. Copies of these linker defined
functions are added to stub sections when the original (in
target->savres_section) can't be reached.
* powerpc.cc (Target_powerpc::Relocate::relocate): Correct address
calculation of out-of-line save/restore function copies.
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* ldgram.y (length_spec): Throw away look-ahead NAME.
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Code should not be using these directly, instead they should be
resolving these dynamically via cb_host_to_target_errno maps.
Fix the Blackfin code and remove the defines out of the header
so no new code can rely on them.
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Now that ChangeLog entries are no longer used for sim patches,
this commit renames all relevant sim ChangeLog to ChangeLog-2021,
similar to what we would do in the context of the "Start of New
Year" procedure.
The purpose of this change is to avoid people merging ChangeLog
entries by mistake when applying existing commits that they are
currently working on.
Also throw in a .gitignore entry to keep people from adding new
ChangeLog files anywhere in the sim tree.
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