Hi,
GDB calls some APIs from opcodes to do disassembly and provide some
call backs. This model makes troubles on C++ exception unwinding,
because GDB is a C++ program, and opcodes is still compiled as C.
As we can see, frame #10 and #12 are C++, while #frame 11 is C,
#10 0x0000000000544228 in memory_error (err=TARGET_XFER_E_IO, memaddr=<optimized out>) at ../../binutils-gdb/gdb/corefile.c:237
#11 0x00000000006b0a54 in print_insn_aarch64 (pc=0, info=0xffffffffeeb0) at ../../binutils-gdb/opcodes/aarch64-dis.c:3185
#12 0x0000000000553590 in gdb_pretty_print_insn (gdbarch=gdbarch@entry=0xbbceb0, uiout=uiout@entry=0xbc73d0, di=di@entry=0xffffffffeeb0,
insn=0xffffffffed40, insn@entry=0xffffffffed90, flags=flags@entry=0,
C++ exception unwinder can't go across frame #11 unless it has
unwind table. However, C program on many architectures doesn't
have it in default. As a result, GDB aborts, which is described
in PR 20939.
This is not the first time we see this kind of problem. We've
had a commit 89525768cd
"Propagate GDB/C++ exceptions across readline using sj/lj-based TRY/CATCH".
We can fix the disassembly bug in a similar way, this is the option one.
Since opcodes is built with gdb, we fix this problem in a different
way as we did for the same issue with readline. Instead of throwing
exception in dis_asm_memory_error, we record the failed memory
address, and throw exception when GDB returns from opcodes disassemblers.
gdb:
2017-01-26 Yao Qi <yao.qi@linaro.org>
Pedro Alves <palves@redhat.com>
PR gdb/20939
* disasm.c (gdb_disassembler::dis_asm_memory_error): Don't
call memory_error, save memaddr instead.
(gdb_disassembler::print_insn): If gdbarch_print_insn returns
negative, cal memory_error.
* disasm.h (gdb_disassembler) <m_err_memaddr>: New field.
gdb/testsuite:
2017-01-26 Yao Qi <yao.qi@linaro.org>
* gdb.base/all-architectures.exp.in (do_arch_tests): Test
disassemble on address 0.
This applies the second part of GDB's End of Year Procedure, which
updates the copyright year range in all of GDB's files.
gdb/ChangeLog:
Update copyright year range in all GDB files.
I build GDB with all targets enabled, and "set architecture rx",
GDB crashes,
(gdb) set architecture rx
Program received signal SIGSEGV, Segmentation fault.
append_flags_type_flag (type=0x20cc360, bitpos=bitpos@entry=0, name=name@entry=0xd27529 "C") at ../../binutils-gdb/gdb/gdbtypes.c:4926
4926 name);
(gdb) bt 10
#0 append_flags_type_flag (type=0x20cc360, bitpos=bitpos@entry=0, name=name@entry=0xd27529 "C") at ../../binutils-gdb/gdb/gdbtypes.c:4926
#1 0x00000000004ce725 in rx_gdbarch_init (info=..., arches=<optimized out>) at ../../binutils-gdb/gdb/rx-tdep.c:1051
#2 0x00000000006b05a4 in gdbarch_find_by_info (info=...) at ../../binutils-gdb/gdb/gdbarch.c:5269
#3 0x000000000060eee4 in gdbarch_update_p (info=...) at ../../binutils-gdb/gdb/arch-utils.c:557
#4 0x000000000060f8a8 in set_architecture (ignore_args=<optimized out>, from_tty=1, c=<optimized out>) at ../../binutils-gdb/gdb/arch-utils.c:531
#5 0x0000000000593d0b in do_set_command (arg=<optimized out>, arg@entry=0x20bee81 "rx ", from_tty=from_tty@entry=1, c=c@entry=0x20b1540)
at ../../binutils-gdb/gdb/cli/cli-setshow.c:455
#6 0x00000000007665c3 in execute_command (p=<optimized out>, p@entry=0x20bee70 "set architecture rx ", from_tty=1) at ../../binutils-gdb/gdb/top.c:666
#7 0x00000000006935f4 in command_handler (command=0x20bee70 "set architecture rx ") at ../../binutils-gdb/gdb/event-top.c:577
#8 0x00000000006938d8 in command_line_handler (rl=<optimized out>) at ../../binutils-gdb/gdb/event-top.c:767
#9 0x0000000000692c2c in gdb_rl_callback_handler (rl=0x20be7f0 "") at ../../binutils-gdb/gdb/event-top.c:200
The cause is that we want to access some builtin types in gdbarch init, but
it is not initialized yet. I fix it by creating the type when it is to be
used. We've already done this in sparc, sparc64 and m68k.
gdb:
2016-12-09 Yao Qi <yao.qi@linaro.org>
PR tdep/20954
* rx-tdep.c (rx_psw_type): New function.
(rx_fpsw_type): New function.
(rx_register_type): Call rx_psw_type and rx_fpsw_type.
(rx_gdbarch_init): Move code to rx_psw_type and
rx_fpsw_type.
gdb/testsuite:
2016-12-09 Yao Qi <yao.qi@linaro.org>
* gdb.base/all-architectures.exp.in: Remove kfail for "rx".
I build GDB for all targets enabled. When I "set architecture rl78",
GDB crashes,
(gdb) set architecture rl78
Program received signal SIGSEGV, Segmentation fault.
append_flags_type_flag (type=0x20cc0e0, bitpos=bitpos@entry=0, name=name@entry=0x11dba3f "CY") at ../../binutils-gdb/gdb/gdbtypes.c:4926
4926 name);
(gdb) bt 10
#0 append_flags_type_flag (type=0x20cc0e0, bitpos=bitpos@entry=0, name=name@entry=0x11dba3f "CY") at ../../binutils-gdb/gdb/gdbtypes.c:4926
#1 0x00000000004aaca8 in rl78_gdbarch_init (info=..., arches=<optimized out>) at ../../binutils-gdb/gdb/rl78-tdep.c:1410
#2 0x00000000006b05a4 in gdbarch_find_by_info (info=...) at ../../binutils-gdb/gdb/gdbarch.c:5269
#3 0x000000000060eee4 in gdbarch_update_p (info=...) at ../../binutils-gdb/gdb/arch-utils.c:557
#4 0x000000000060f8a8 in set_architecture (ignore_args=<optimized out>, from_tty=1, c=<optimized out>) at ../../binutils-gdb/gdb/arch-utils.c:531
#5 0x0000000000593d0b in do_set_command (arg=<optimized out>, arg@entry=0x20be851 "rl78", from_tty=from_tty@entry=1, c=c@entry=0x20b1540)
at ../../binutils-gdb/gdb/cli/cli-setshow.c:455
#6 0x00000000007665c3 in execute_command (p=<optimized out>, p@entry=0x20be840 "set architecture rl78", from_tty=1) at ../../binutils-gdb/gdb/top.c:666
#7 0x00000000006935f4 in command_handler (command=0x20be840 "set architecture rl78") at ../../binutils-gdb/gdb/event-top.c:577
#8 0x00000000006938d8 in command_line_handler (rl=<optimized out>) at ../../binutils-gdb/gdb/event-top.c:767
#9 0x0000000000692c2c in gdb_rl_callback_handler (rl=0x20be890 "") at ../../binutils-gdb/gdb/event-top.c:200
The cause is that we want to access some builtin types in gdbarch init, but
it is not initialized yet. I fix it by creating the type when it is to be
used. We've already done this in sparc, sparc64 and m68k.
gdb:
2016-12-09 Yao Qi <yao.qi@linaro.org>
PR tdep/20953
* rl78-tdep.c (rl78_psw_type): New function.
(rl78_register_type): Call rl78_psw_type.
(rl78_gdbarch_init): Move code to rl78_psw_type.
gdb/testsuite:
2016-12-09 Yao Qi <yao.qi@linaro.org>
* gdb.base/all-architectures.exp.in: Remove kfail for rl78.
This adds a test that exposes several problems fixed by earlier
patches:
#1 - Buffer overrun when host/target formats match, but sizes don't.
https://sourceware.org/ml/gdb-patches/2016-03/msg00125.html#2 - Missing handling for FR-V FR300.
https://sourceware.org/ml/gdb-patches/2016-03/msg00117.html#3 - BFD architectures with spaces in their names (v850).
https://sourceware.org/ml/binutils/2016-03/msg00108.html#4 - The OS ABI names with spaces issue.
https://sourceware.org/ml/gdb-patches/2016-03/msg00116.html#5 - Bogus HP/PA long double format.
https://sourceware.org/ml/gdb-patches/2016-03/msg00122.html#6 - Cris big endian internal error.
https://sourceware.org/ml/gdb-patches/2016-03/msg00126.html#7 - Several PowerPC bfd archs/machines not handled by gdb.
https://sourceware.org/bugzilla/show_bug.cgi?id=19797
And hopefully helps catch others in the future.
This started out as a test that simply did,
gdb -ex "print 1.0L"
to exercise #1 above.
Then to cover both 32-bit target / 64-bit host and the converse, I
thought of having the testcase print the floats twice, once with the
architecture set to "i386" and then to "i386:x86-64". This way it
wouldn't matter whether gdb was built as 32-bit or a 64-bit program.
Then I thought that other archs might have similar host/target
floatformat conversion issues as well. Instead of hardcoding some
architectures in the test file, I thought we could just iterate over
all bfd architectures and OS ABIs supported by the gdb build being
tested. This is what then exposed all the other problems listed
above...
With an --enable-targets=all, this exercises over 14 thousand
combinations. If left in a single test file, it all consistenly runs
in under a minute on my machine (An Intel i7-4810MQ @ 2.8 MHZ running
Fedora 23). Split in 8 chunks, as in this commit, it runs in around
25 seconds, with make -j8.
To avoid flooding the gdb.sum file, it avoids calling "pass" on each
tested combination/iteration. I'm explicitly not implementing that by
passing an empty message to gdb_test / gdb_test_multiple, because I
still want a FAIL to be logged in gdb.sum. So instead this puts the
internal passes in the gdb.log file, only, prefixed "IPASS:", for
internal pass. TBC, if some iteration fails, it'll still show up as
FAIL in gdb.sum. If this is an approach that takes on, I can see us
extending the common bits to support it for all testcases.
gdb/testsuite/ChangeLog:
2016-12-09 Pedro Alves <palves@redhat.com>
* gdb.base/all-architectures-0.exp: New file.
* gdb.base/all-architectures-1.exp: New file.
* gdb.base/all-architectures-2.exp: New file.
* gdb.base/all-architectures-3.exp: New file.
* gdb.base/all-architectures-4.exp: New file.
* gdb.base/all-architectures-5.exp: New file.
* gdb.base/all-architectures-6.exp: New file.
* gdb.base/all-architectures-7.exp: New file.
* gdb.base/all-architectures.exp.in: New file.
Yao Qi
Joel Brobecker
Pedro Alves