This line of code...
*(int64_t *) ptr = *(int32_t *) ptr;
...in linux-x86-low.c is not needed (and does not work correctly)
within a 32-bit executable. I added an __x86_64__ ifdef (which is
used extensively elsewhere in the file for like purposes) to prevent
this code from being included in 32-bit builds.
It fixes the following regressions when running on native
i686-pc-linux-gnu:
FAIL: gdb.server/abspath.exp: continue to main
FAIL: gdb.server/connect-without-multi-process.exp: multiprocess=auto: continue to main
FAIL: gdb.server/connect-without-multi-process.exp: multiprocess=off: continue to main
FAIL: gdb.server/ext-restart.exp: restart: run to main
FAIL: gdb.server/ext-restart.exp: run to main
FAIL: gdb.server/ext-run.exp: continue to main
FAIL: gdb.server/ext-wrapper.exp: print d
FAIL: gdb.server/ext-wrapper.exp: restart: print d
FAIL: gdb.server/ext-wrapper.exp: restart: run to marker
FAIL: gdb.server/ext-wrapper.exp: run to marker
FAIL: gdb.server/no-thread-db.exp: continue to breakpoint: after tls assignment
FAIL: gdb.server/reconnect-ctrl-c.exp: first: stop with control-c
FAIL: gdb.server/reconnect-ctrl-c.exp: second: stop with control-c
FAIL: gdb.server/run-without-local-binary.exp: run test program until the end
FAIL: gdb.server/server-kill.exp: continue to breakpoint: after server_pid assignment
FAIL: gdb.server/server-kill.exp: tstatus
FAIL: gdb.server/server-run.exp: continue to main
gdb/gdbserver/ChangeLog:
* linux-x86-low.c (x86_fill_gregset): Don't compile 64-bit
sign extension code on 32-bit builds.
Add paired load-link and store-conditional instructions to the
EVA ASE for MIPS32R6[1]. These instructions are optional within
the EVA ASE. Their presence is indicated by the XNP bit in the
Config5 register.
[1] "MIPS Architecture for Programmers Volume II-A: The MIPS32
Instruction Set Manual", Imagination Technologies Ltd., Document
Number: MD00086, Revision 6.06, December 15, 2016, Section 3.2
"Alphabetical List of Instructions", pp. 230-231, pp. 357-360.
gas/
* config/tc-mips.c (mips_set_ase): Handle ASE_EVA_R6.
(macro) <M_LLWPE_AB, M_SCWPE_AB>: New cases.
(mips_after_parse_args): Translate EVA to EVA_R6.
* testsuite/gas/mips/ase-errors-1.s: Add new instructions.
* testsuite/gas/mips/eva.s: Likewise.
* testsuite/gas/mips/ase-errors-1.l: Check errors for
new instructions.
* testsuite/gas/mips/mipsr6@eva.d: Check new test cases.
include/
* opcode/mips.h (ASE_EVA_R6): New macro.
(M_LLWPE_AB, M_SCWPE_AB): New enum values.
opcodes/
* mips-dis.c (mips_calculate_combination_ases): Add ISA
argument and set ASE_EVA_R6 appropriately.
(set_default_mips_dis_options): Pass ISA to above.
(parse_mips_dis_option): Likewise.
* mips-opc.c (EVAR6): New macro.
(mips_builtin_opcodes): Add llwpe, scwpe.
Derived from patch authored by Andrew Bennett <andrew.bennett@imgtec.com>
In gdb.base/index-cache.exp, handle the case that binfile contains either a
.gdb_index or .debug_names index section.
Tested on x86_64-linux with native, cc-with-gdb-index and cc-with-debug-names.
gdb/testsuite/ChangeLog:
2019-05-06 Tom de Vries <tdevries@suse.de>
* lib/gdb.exp (exec_has_index_section): New proc.
* gdb.base/index-cache.exp: Handle case that binfile contains an index
section.
This fixes the recently added ld-elf/pr24511 test failure on pj-elf.
Incidentally, pj-elf has failed its gas "pj" test since 2005-12-22
(git commit 54758c3e39). I think that makes the target ripe for
obsolescence.
bfd/
* elf32-pj.c (pj_elf_reloc): Don't report undefined weak as an error.
ld/
* testsuite/ld-undefined/weak-undef.exp: Don't xfail pj.
GOT and PLT relocs shouldn't have their symbols replaced with a
section symbol plus added. Nor should the HIGHA TLS relocations,
which failed to be caught by the range test in ppc_fix_adjustable.
bfd/
* reloc.c (BFD_RELOC_PPC64_TPREL16_HIGH, BFD_RELOC_PPC64_TPREL16_HIGHA),
(BFD_RELOC_PPC64_DTPREL16_HIGH, BFD_RELOC_PPC64_DTPREL16_HIGHA):
Sort before BFD_RELOC_PPC64_DTPREL16_HIGHESTA entry.
gas/
* config/tc-ppc.c (ppc_fix_adjustable): Exclude all GOT and PLT
relocs, and VLE sdarel relocs.
* testsuite/gas/ppc/power4.d: Adjust.
Location views at borders between subsegments/subsections in the same
segment/section are computed as if each new subsegment/subsection
started with a forced view reset to zero, but the line number program
does not introduce resets that are not explicitly requested, so if a
subsegment ends at the same address another starts, the line number
program will have a continuity of views at the border address, whereas
the initial view number label in the latter subsegment will be
miscomputed as zero.
This patch delays the assignment of view expressions at subsegment
heads to the time of chaining the frags of subsegments into a single
segment, so that they are set based on the view at the end of the
previous subsegment in the same segment.
The line number program created for the test program had an
unnecessary DW_LNS_advance_pc at the end. This patch also arranges
for us not to emit it.
for gas/ChangeLog
* dwarf2dbg.c (set_or_check_view): Skip heads when assigning
views of prior locs.
(dwarf2_gen_line_info_1): Skip heads.
(size_inc_line_addr, emit_inc_line_addr): Drop
DW_LNS_advance_pc for zero addr delta.
(dwarf2_finish): Assign views for heads of segments.
* testsuite/gas/elf/dwarf2-19.d: New.
* testsuite/gas/elf/dwarf2-19.s: New.
* testsuite/gas/elf/elf.exp: Test it.
This removes a VEC from aarch64-tdep.c, replacing it with a
std::vector.
gdb/ChangeLog
2019-05-04 Tom Tromey <tom@tromey.com>
* aarch64-tdep.c (stack_item_t): Remove typedef and DEF_VEC.
(struct aarch64_call_info): Add initializers.
<si>: Now a std::vector.
(pass_on_stack, aarch64_push_dummy_call): Update.
This replaces a VEC in ppc-linux-nat.c with a std::vector.
gdb/ChangeLog
2019-05-04 Simon Marchi <simon.marchi@efficios.com>
Tom Tromey <tom@tromey.com>
* ppc-linux-nat.c (thread_points_p): Remove typedef and DEF_VEC.
(ppc_threads): Now a std::vector. Now static.
(hwdebug_find_thread_points_by_tid)
(ppc_linux_nat_target::low_new_thread, ppc_linux_thread_exit):
Update.
This changes arm-linux-nat.c to use gdb_assert_not_reached rather than
an assert of false.
gdb/ChangeLog
2019-05-04 Tom Tromey <tom@tromey.com>
* arm-linux-nat.c (arm_linux_nat_target::can_use_hw_breakpoint):
Use gdb_assert_not_reached.
This changes compile_cplus_convert_enum to use "false".
Note that this variable is never modified, which seems like an error.
I filed PR compile/24473 for this.
gdb/ChangeLog
2019-05-04 Tom Tromey <tom@tromey.com>
* compile/compile-cplus-types.c (compile_cplus_convert_enum): Use
"false".
This changes select_frame_for_mi to use "false" rather than "FALSE".
gdb/ChangeLog
2019-05-04 Tom Tromey <tom@tromey.com>
* stack.c (select_frame_for_mi): Use "false", not "FALSE".
The 'is' operator is not meant to be used for comparisons. It currently working
is an implementation detail of CPython. CPython 3.8 has added a SyntaxWarning
for this.
This patch partly reverts commit 8a6d42345 ("Change representation of
psymbol to flush out accessors"); specifically, it changes
partial_symbol to no longer derive from general_symbol_info.
The basic problem here is that the bcache compares objects bitwise,
and this change made it less likely that the relevant fields in the
psymbol would be fully initialized. This could be seen by running a
test under valgrind on the Fedora-i686 buildbot.
I considered a simpler patch, namely just zeroing the psymbol's
"value" field in add_psymbol_to_bcache. However, it wasn't clear to
me that this memset could not then be optimized away by the compiler.
Regression tested by the buildbot. I think this should go in 8.3 as
well.
gdb/ChangeLog
2019-05-04 Tom Tromey <tom@tromey.com>
* psymtab.c (psymbol_name_matches, match_partial_symbol)
(lookup_partial_symbol, print_partial_symbols)
(recursively_search_psymtabs, sort_pst_symbols, psymbol_hash)
(psymbol_compare): Update.
(add_psymbol_to_bcache): Clear the entire psymbol.
(maintenance_check_psymtabs): Update.
* psympriv.h (struct partial_symbol): Don't derive from
general_symbol_info.
<obj_section, unrelocated_address, address,
set_unrelocated_address>: Update.
<ginfo>: New member.
* dwarf-index-write.c (write_psymbols, debug_names::insert)
(debug_names::write_psymbols): Update.
Add a target board that makes it easy to run the test suite with a
.debug_names section added to executables.
gdb/ChangeLog:
2019-05-04 Tom de Vries <tdevries@suse.de>
* contrib/cc-with-tweaks.sh: Support -n arg.
gdb/testsuite/ChangeLog:
2019-05-04 Tom de Vries <tdevries@suse.de>
* boards/cc-with-debug-names.exp: New file.
m32c_md_end attempted to pad out a code section with nops, but this
was just plain wrong in many ways:
- The padding didn't happen at all if the last section emitted wasn't
a code section.
- The padding went to the wrong place if subsections were used, and
the last subseg used wasn't the highest numbered subseg.
- Padding wasn't added to all code sections.
- If the last section was empty, it was padded to 4 bytes.
- The padding didn't go to a 4-byte alignment boundary, instead it
effectively made the last instruction 4 bytes in size.
- The padding didn't take into account that code sections may have
contents other than machine instructions.
So, rip it out and handle nop padding properly, also fixing .align
.balign/.p2align in the middle of code.
gas/
* config/tc-m32c.c (insn_size): Delete static var.
(md_begin): Don't set it.
(m32c_md_end): Delete.
(md_assemble): Add insn_size auto var.
* config/tc-m32c.h (md_end): Don't define.
(m32c_md_end): Delete.
(NOP_OPCODE, HANDLE_ALIGN, MAX_MEM_FOR_RS_ALIGN_CODE): Define.
* testsuite/gas/all/align.d: Remove m32c from notarget list.
* testsuite/gas/all/incbin.d: Likewise.
* testsuite/gas/elf/dwarf2-11.d: Likewise.
* testsuite/gas/macros/semi.d: Likewise.
* testsuite/gas/all/gas.exp (do_comment): Similarly.
ld/
* testsuite/ld-scripts/fill.d: Don't xfail m32c
* testsuite/ld-scripts/fill16.d: Likewise.
This patch restricts the section names matched in coff_section_type,
a function that translates section names to symbol type, and arranges
to translate section flags to symbol type before looking at names.
The latter change resulted in various test failures due to improper
section flags being used in tests, and by the plugin support, so fix
that too.
The new test fails on many ELF targets that lack .init/fini_array
in their scripts. I've just xfailed those. pru-elf oddly defines
__init_array_begin rather than __init_array_start. I've left that
target as a FAIL, and pj-elf too which reports an error for undefined
weak symbols.
bfd/
PR 24511
* syms.c (coff_section_type): Only allow '.', '$' and numeric
following the standard section names.
(bfd_decode_symclass): Prioritize section flag tests in
decode_section_type before name tests in coff_section_type.
* plugin.c (bfd_plugin_canonicalize_symtab): Init fake_section
and fake_common_section using BFD_FAKE_SECTION. Use "fake" as
their names and choose standard .text section flags for
fake_section.
ld/
PR 24511
* testsuite/ld-elf/pr14156a.d: Allow for .init/.fini being a
data section on hppa64.
* testsuite/ld-elf/pr14156b.d: Likewise.
* testsuite/ld-scripts/pr18963.t: Map standard sections to set
output section flags.
* testsuite/ld-scripts/sane1.t: Likewise.
* testsuite/ld-elf/init-fini-arrays.s: Reference __init_array_start
and __fini_array_start. Define __start et al.
* testsuite/ld-elf/pr24511.d: New test.
Valgrind reports leaks such as the below in the tests:
gdb.threads/corethreads.exp
gdb.threads/gcore-thread.exp
gdb.ada/task_switch_in_core.exp
gdb.trace/tfile.exp
gdb.base/siginfo-thread.exp
==12701== 1,123 (72 direct, 1,051 indirect) bytes in 1 blocks are definitely lost in loss record 2,928 of 3,247
==12701== at 0x4C2C4CC: operator new(unsigned long) (vg_replace_malloc.c:344)
==12701== by 0x5CF771: get_thread_arch_aspace_regcache(ptid_t, gdbarch*, address_space*) (regcache.c:330)
==12701== by 0x5CF92A: get_thread_regcache (regcache.c:366)
==12701== by 0x5CF92A: get_current_regcache() (regcache.c:372)
==12701== by 0x4C7964: get_current_frame() (frame.c:1587)
==12701== by 0x4C7A3C: get_selected_frame(char const*) (frame.c:1651)
==12701== by 0x669EAD: print_thread_info_1(ui_out*, char const*, int, int, int) (thread.c:1151)
==12701== by 0x66A9A1: info_threads_command(char const*, int) (thread.c:1217)
==12701== by 0x40A878: cmd_func(cmd_list_element*, char const*, int) (cli-decode.c:1892)
...
Fix these leaks by clearing registers and frame caches.
This leak and fix is similar to the leak fixed by 799efbe8e01
Some versions of gcc have a bug that causes
for (struct mumble : something)
... to give a compiler error. We routinely work around this bug in
gdb, but apparently had not done so in a while. This patch fixes the
remaining known cases of this problem.
gdb/ChangeLog
2019-05-03 Sandra Loosemore <sandra@codesourcery.com>
Tom Tromey <tom@tromey.com>
* dictionary.c (collate_pending_symbols_by_language): Remove
"struct" from foreach.
* symtab.c (lookup_global_symbol_from_objfile)
(lookup_symbol_in_objfile_from_linkage_name): Remove "struct" from
foreach.
* ser-tcp.c (net_open): Remove "struct" from foreach.
* objfiles.c (objfile_relocate, objfile_rebase)
(objfile_has_symbols): Remove "struct" from foreach.
* minsyms.c (lookup_minimal_symbol_by_pc_section): Remove "struct"
from foreach.
* dwarf2read.c (handle_struct_member_die): Remove "struct" from
foreach.
* darwin-nat.c (thread_info_from_private_thread_info): Remove
"struct" from foreach.
* ada-lang.c (create_excep_cond_exprs)
(ada_exception_catchpoint_cond_string): Remove "struct" from
foreach.
An internal bug report points out that, when a global character enum
type is used, casting fails, like:
(gdb) print global_char_enum'('F')
$1 = 70
The bug here turns out to be that enumerators are qualified, so for
example the mangled name might be "pck__QU48", rather than "QU48".
This patch fixes the problem by only examining the suffix of the
enumerator. This is ok because the type is already known, and because
the mangling scheme ensures that there won't be clashes.
Tested on x86-64 Fedora 29.
gdb/ChangeLog
2019-05-03 Tom Tromey <tromey@adacore.com>
* ada-exp.y (convert_char_literal): Check suffix of each
enumerator.
gdb/testsuite/ChangeLog
2019-05-03 Tom Tromey <tromey@adacore.com>
* gdb.ada/char_enum/pck.ads (Global_Enum_Type): New type.
* gdb.ada/char_enum/foo.adb: Use Global_Enum_Type.
* gdb.ada/char_enum.exp: Add test.
This patch comes from PR ada/21406. It adds the noyywrap option to
ada-lex.l. This was already done (by the same author) for other .l
files in the binutils-gdb tree, so it seems reasonably safe.
Tested on x86-64 Fedora 29.
gdb/ChangeLog
2019-05-03 Dilyan Palauzov <dilyan.palauzov@aegee.org>
PR ada/21406:
* ada-exp.y (yywrap): Don't define.
* ada-lex.l (%option): Add noyywrap
(yywrap): Remove.
Add a target board cc-with-gdb-index.exp, to make it easy to run cc-with-tweaks
with CC_WITH_TWEAKS_FLAGS='-i'.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2019-05-03 Tom de Vries <tdevries@suse.de>
* boards/cc-with-gdb-index.exp: New file.
This changeset defines _WIN32_WINNT to at least 0x0501, the level
of Windows XP, unless defined to a higher level, in a single
place. It then removes all the overrides of _WIN32_WINNT in
individual files as no longer needed. Doing this also solves
compilation of windows-nat.c with mingw.org's MinGW, as that
file uses CONSOLE_FONT_INFO which needs the XP level to become
exposed in the Windows headers, while mingw.org defaults to
Windows 9X.
gdb/ChangeLog:
2019-05-03 Eli Zaretskii <eliz@gnu.org>
* common/common-defs.h [__MINGW32__ || __CYGWIN__]: Define
_WIN32_WINNT to the XP level, unless already defined to a higher
level.
* unittests/parse-connection-spec-selftests.c:
* ser-tcp.c:
* common/netstuff.c [USE_WIN32API]: Remove the _WIN32_WINNT
override.
gdb/gdbserver/ChangeLog:
2019-05-03 Eli Zaretskii <eliz@gnu.org>
* remote-utils.c:
* gdbreplay.c [USE_WIN32API]: Remove the _WIN32_WINNT override.
If you put the separate debug file in a global debug directory, GDB on
MS-Windows would fail to find it. This happens because we obtain the
directory to look up the debug file by concatenating the debug
directory name with the leading directories of the executable, and the
latter includes the drive letter on MS-Windows. So we get an invalid
file name like
d:/usr/lib/debug/d:/usr/bin/foo.debug
This commit fixes that by removing the colon of the drive letter,
thus producing
d:/usr/lib/debug/d/usr/bin/foo.debug
gdb/ChangeLog:
2019-05-03 Eli Zaretskii <eliz@gnu.org>
* symfile.c (find_separate_debug_file): Remove colon from the
drive spec of DOS/Windows file names of the target, so that the
file name produced from DEBUGDIR and the target's directory will
be valid on DOS/Windows systems.
gdb/doc/ChangeLog:
2019-05-03 Eli Zaretskii <eliz@gnu.org>
* gdb.texinfo (Separate Debug Files): Document how the
subdirectory of the global debug directory is computed on
MS-Windows/MS-DOS.
When printing a rust structure that contains a string GDB can
currently fail to read the fields that define the string. This is
because GDB mistakenly treats a value that is the parent structure as
though it is the structure that defines the string, and then fails to
find the fields needed to extract a string.
The solution is to create a new value to represent the string field of
the parent value.
gdb/ChangeLog:
* rust-lang.c (val_print_struct): Handle printing structures
containing strings.
gdb/testsuite/ChangeLog:
* gdb.rust/simple.exp: Add new test case.
* gdb.rust/simple.rs (struct StringAtOffset): New struct.
(main): Initialise an instance of the new struct.
The .code16gcc directive to support 16-bit mode with 32-bit address.
For IRET without a suffix, generate 16-bit IRET with a warning to
return from an interrupt handler in 16-bit mode.
PR gas/24485
* config/tc-i386.c (process_suffix): Issue a warning to IRET
without a suffix for .code16gcc.
* testsuite/gas/i386/jump16.s: Add tests for iretX.
* testsuite/gas/i386/jump16.d: Updated.
* testsuite/gas/i386/jump16.e: New file.
I noticed that _initialize_valarith is empty. This patch removes it.
Because init.c is constructed at build time, there's no reason to keep
empty initialization functions around, because there's no overhead to
reintroducing them when needed.
gdb/ChangeLog
2019-05-02 Tom Tromey <tromey@adacore.com>
* valarith.c (_initialize_valarith): Remove.
This patch enables the new Transactional Memory Extension added recently
as part of Arm's new architecture technologies.
We introduce a new optional extension "tme" to enable this. The following
instructions are part of the extension:
* tstart <Xt>
* ttest <Xt>
* tcommit
* tcancel #<imm>
The ISA for the above can be found here:
https://developer.arm.com/docs/ddi0602/latest/base-instructions-alphabetic-order
*** gas/ChangeLog ***
2019-05-01 Sudakshina Das <sudi.das@arm.com>
* config/tc-aarch64.c (parse_operands): Add case for
AARCH64_OPND_TME_UIMM16.
(aarch64_features): Add "tme".
* doc/c-aarch64.texi: Document the same.
* testsuite/gas/aarch64/tme-invalid.d: New test.
* testsuite/gas/aarch64/tme-invalid.l: New test.
* testsuite/gas/aarch64/tme-invalid.s: New test.
* testsuite/gas/aarch64/tme.d: New test.
* testsuite/gas/aarch64/tme.s: New test.
*** include/ChangeLog ***
2019-05-01 Sudakshina Das <sudi.das@arm.com>
* opcode/aarch64.h (AARCH64_FEATURE_TME): New.
(enum aarch64_opnd): Add AARCH64_OPND_TME_UIMM16.
*** opcodes/ChangeLog ***
2019-05-01 Sudakshina Das <sudi.das@arm.com>
* aarch64-asm-2.c: Regenerated.
* aarch64-dis-2.c: Regenerated.
* aarch64-opc-2.c: Regenerated.
* aarch64-opc.c (operand_general_constraint_met_p): Add case for
AARCH64_OPND_TME_UIMM16.
(aarch64_print_operand): Likewise.
* aarch64-tbl.h (QL_IMM_NIL): New.
(TME): New.
(_TME_INSN): New.
(struct aarch64_opcode): Add tstart, tcommit, ttest and tcancel.
A user at AdaCore found a case where assignment to a nested packed
structure would fail. The bug is that ada_value_primitive_field
doesn't account for the situation where a field is not packed relative
to its containing structure, but where the structure itself is packed
in its parent.
gdb/ChangeLog
2019-05-01 Tom Tromey <tromey@adacore.com>
* ada-lang.c (ada_value_primitive_field): Treat more fields as
bitfields.
gdb/testsuite/ChangeLog
2019-05-01 Tom Tromey <tromey@adacore.com>
* gdb.ada/packed_array_assign/aggregates.ads (Nested_Packed): New
record.
(NPR): New variable.
* gdb.ada/packed_array_assign.exp: Add nested packed assignment
test.
A bug internal to AdaCore notes that assigning a non-scalar value to
an element of a packed array will sometimes fail.
The bug turns out to be that ada_value_assign incorrectly computes the
starting point for the assignment. This patch fixes the problem.
gdb/ChangeLog
2019-05-01 Tom Tromey <tromey@adacore.com>
* ada-lang.c (ada_value_assign): Correctly compute starting offset
for big-endian copies.
gdb/testsuite/ChangeLog
2019-05-01 Tom Tromey <tromey@adacore.com>
* gdb.ada/packed_array_assign.exp: Add packed assignment
regression test.
PR 24507
* nm.c: (print_format): New variable.
(value_format_32bit, value_format_64bit): Delete.
(set_print_radix): Remove code to alter value_format strings.
(set_output_format): Record chosen format in print_format.
(get_print_format): New function - constructs a printf formatting
string according to the requirements of size, radix, and output
format.
(print_value): Use get_print_format.
* testsuite/binutils-all/nm.exp: Add tests of "nm --format=posix"
and "nm -t d".
When running fullpath-expand.exp with target_board=dwarf4-gdb-index, we run
into:
...
$ make check-gdb RUNTESTFLAGS="--target_board=dwarf4-gdb-index fullpath-expand.exp"
Running src/gdb/testsuite/gdb.base/fullpath-expand.exp ...
gdb compile failed, cc-with-tweaks.sh: unable to find usable gdb
=== gdb Summary ===
nr of untested testcases 1
...
The same happens with fullname.exp.
The dwarf4-gdb-index.exp board file includes cc-with-tweaks.exp, which uses
cc-with-tweaks.sh, which calls gdb-add-index.sh.
The gdb-add-index.sh script uses a gdb executable, defaulting to gdb:
...
GDB=${GDB:=gdb}
...
The cc-with-tweaks.sh script tries to ensure that the build gdb executable is
used by gdb-add-index.sh:
...
if [ -z "$GDB" ]
then
if [ -f ./gdb ]
then
GDB="./gdb -data-directory data-directory"
elif [ -f ../gdb ]
then
GDB="../gdb -data-directory ../data-directory"
elif [ -f ../../gdb ]
then
GDB="../../gdb -data-directory ../../data-directory"
else
echo "$myname: unable to find usable gdb" >&2
exit 1
fi
fi
...
So, if the current directory is build/gdb/testsuite, then a gdb executable
build/gdb/testsuite/../gdb will be used.
However, in the case of fullpath-expand.exp the test cd's into the sources:
...
set saved_pwd [pwd]
cd $srcdir
set err [gdb_compile "${subdir}/${srcfile} ${subdir}/${srcfile2}" $binfile \
executable {debug}]
cd $saved_pwd
...
and cc-with-tweaks.sh generates the "unable to find usable gdb" error.
The same error occurs if we use --target_board=cc-with-dwz instead (only in
this case we actually don't need gdb, we just need the GDB variable to be set
in cc-with-tweaks.sh, which arguably is a bug in cc-with-tweaks.sh).
Fix both errors in cc-with-tweaks.exp by generating a gdb script gdb.sh using
$GDB, $GDBFLAGS and $INTERNAL_GDBFLAGS and passing this script to
cc-with-tweaks.sh by setting env(GDB).
Tested on x86_64-linux for gdb.base.
gdb/testsuite/ChangeLog:
2019-05-01 Tom de Vries <tdevries@suse.de>
* boards/cc-with-tweaks.exp: Generate gdb.sh, and pass it in env(GDB).
Board file dwarf4-gdb-index.exp contains all the commands from
cc-with-tweaks.exp (with CC_WITH_TWEAKS_FLAGS set to "-i").
Make dwarf4-gdb-index.exp smaller by including cc-with-tweaks.exp.
Tested on x86_64-linux for gdb.base.
gdb/testsuite/ChangeLog:
2019-05-01 Tom de Vries <tdevries@suse.de>
* boards/dwarf4-gdb-index.exp: Use cc-with-tweaks.exp.
Dwarf5 defines DW_FORM_strx1 and others, which are similar
to DW_FORM_strx but uses 1-4 bytes unsigned integers. This is
a small step towards supporting dwarf5 in gdb.
This global is meant to point to the "main" thread of execution of
the program we are debugging. It is set when attaching to a process
or when receiving a CREATE_PROCESS_DEBUG_EVENT event. The theory at
the time was that this was also going to be the thread receiving
the EXIT_PROCESS_DEBUG_EVENT event.
Unfortunately, we have discovered since then that this is actually
not guaranteed. What this means in practice is that there is moderate
risk that main_thread_id refers to a thread which no longer exists.
This global is used in 3 situations:
- OUTPUT_DEBUG_STRING_EVENT
- LOAD_DLL_DEBUG_EVENT
- UNLOAD_DLL_DEBUG_EVENT
It's not clear why we would need to use the main_thread_id in those cases
instead of using the thread ID provided by the kernel events itself.
So this patch implements this approach, which then allows us to delete
the main_thread_id global.
gdb/testsuite:
* windows-nat.c (main_thread_id): Delete.
(handle_output_debug_string): Replace main_thread_id by
current_event.dwThreadId.
(fake_create_process): Likewise.
(get_windows_debug_event) <CREATE_PROCESS_DEBUG_EVENT>:
Do not set main_thread_id.
<LOAD_DLL_DEBUG_EVENT>: Replace main_thread_id by
current_event.dwThreadId.
<UNLOAD_DLL_DEBUG_EVENT>: Likewise.
We have observed that GDB would randomly trip the following
assertion failure when debugging on Windows. When allowing
the program to run until the inferior exits, we occasionally see:
(gdb) cont
Continuing.
[Thread 48192.0xd100 exited with code 1]
[Thread 48192.0x10ad8 exited with code 1]
[Thread 48192.0x36e28 exited with code 0]
[Thread 48192.0x52be4 exited with code 0]
[Thread 48192.0x5aa40 exited with code 0]
../../src/gdb/thread.c:453: internal-error: void delete_thread_1(thread_inf
o*, bool): Assertion `thr != nullptr' failed.
Running the same scenario with some additional traces enabled...
(gdb) set verbose
(gdb) set debugevents
... allows us to understand what the issue is. To understand, we need
to first look at the events received when starting the program, and
in particular which threads got created how. First, we get a
CREATE_PROCESS_DEBUG_EVENT for tid=0x442a8:
gdb: kernel event for pid=317536 tid=0x442a8 code=CREATE_PROCESS_DEBUG_EVENT)
Shortly after, we get some CREATE_THREAD_DEBUG_EVENT events,
one of them being for tid=0x4010c:
gdb: kernel event for pid=317536 tid=0x4010c code=CREATE_THREAD_DEBUG_EVENT)
Fast forward a bit of debugging, and we do a "cont" as above,
at which point the programs reaches the end, and the system reports
"exit" events. The first interesting one is the following:
gdb: kernel event for pid=317536 tid=0x442a8 code=EXIT_THREAD_DEBUG_EVENT)
This is reporting a thread-exit event for a thread whose tid
is the TID of what we call the "main thread". That's the thread
that was created when we received the CREATE_PROCESS_DEBUG_EVENT
notification, and whose TID is actually stored in a global variable
named main_thread_id. This is not something we expected, as
the assumption we made was that the main thread would exit last,
and we would be notified of it via an EXIT_PROCESS_DEBUG_EVENT.
But apparently, this is not always true, at least on Windows Server
2012 and 2016 where this issue has been observed happening randomly.
The consequence of the above notification is that we call
windows_delete_thread for that thread, which removes it from
our list of known threads.
And a little bit later, then we then get the EXIT_PROCESS_DEBUG_EVENT,
and we can see that the associated tid is not the main_thread_id,
but rather the tid of one of the threads that was created during
the lifetime of the program, in this case tid=0x4010c:
gdb: kernel event for pid=317536 tid=0x4010c code=EXIT_PROCESS_DEBUG_EVENT)
And the debug trace printed right after shows why we're crashing:
[Deleting Thread 317536.0x442a8]
We are trying to delete the thread whose tid=0x442a8, which is
the main_thread_id! As we have already deleted that thread before,
the search for it returns a nullptr, which then trips the assertion
check in delete_thread_1.
This commit fixes this issue. It ignores the open question of
what to do with the main_thread_id global, particularly after
that thread has been removed from our list of threads. This will
be dealt with as a separate patch, to allow cherry-picking
this patch into a release branch.
For now, we fix the code so as to avoid this crash.
gdb/ChangeLog:
* windows-nat.c (get_windows_debug_event) <EXIT_PROCESS_DEBUG_EVENT>:
Use current_event.dwThreadId instead of main_thread_id.
When an Ada program is dynamically linked against libgnat, and when
one of the standard exceptions is used, the exception object may be
referenced by the main executable using a copy relocation.
In this situation, a "catch exception" for those exceptions will not
manage to stop. This happens because, under the hood, "catch
exception" creates an expression object that examines the object
addresses -- but in this case, the address will be incorrect.
This patch fixes the problem by arranging for these filter expressions
to examine all the relevant minimal symbols. This way, the object
from libgnat will be found as well.
Tested on x86-64 Fedora 29.
gdb/ChangeLog
2019-04-30 Tom Tromey <tromey@adacore.com>
* ada-lang.c (ada_lookup_simple_minsyms): New function.
(create_excep_cond_exprs): Iterate over program spaces.
(ada_exception_catchpoint_cond_string): Examine all minimal
symbols for exception types.
gdb/testsuite/ChangeLog
2019-04-30 Tom Tromey <tromey@adacore.com>
* lib/ada.exp (find_ada_tool): New proc.
* lib/gdb.exp (gdb_compile_shlib): Allow .o files as inputs.
* gdb.ada/catch_ex_std.exp: New file.
* gdb.ada/catch_ex_std/foo.adb: New file.
* gdb.ada/catch_ex_std/some_package.adb: New file.
* gdb.ada/catch_ex_std/some_package.ads: New file.
