forked from Imagelibrary/binutils-gdb
de89924a63b3b834e8d0c1e193555bd28a3978e9
A following patch adds an exists_non_stop_target call in the target_terminal routines, and that surprisingly caused a weird regression / GDB crash: $ make check RUNTESTFLAGS="--target_board=native-extended-gdbserver" TESTS="gdb.base/signest.exp" ... configuring for gdbserver local testing (extended-remote) Using src/gdb/testsuite/config/extended-gdbserver.exp as tool-and-target-specific interface file. Running src/gdb/testsuite/gdb.base/signest.exp ... ERROR: GDB process no longer exists Debugging the core, we see infinite recursion: (top-gdb) bt 20 #0 0x0000561d6a1bfeff in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #1 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #2 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #3 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #4 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #5 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #6 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #7 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #8 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #9 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #10 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #11 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #12 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #13 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #14 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #15 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #16 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #17 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #18 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #19 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 (More stack frames follow...) (top-gdb) bt -30 #157054 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #157055 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #157056 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #157057 0x0000561d6a1bfeb8 in get_frame_arch (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:2939 #157058 0x0000561d6a1b989f in frame_unwind_find_by_frame (this_frame=0x561d6b19f9c0, this_cache=0x561d6b19f9d8) at src/gdb/frame-unwind.c:174 #157059 0x0000561d6a1bff04 in frame_unwind_arch (next_frame=0x561d6b19f9c0) at src/gdb/frame.c:2950 #157060 0x0000561d6a1bbc65 in frame_unwind_pc (this_frame=0x561d6b19f9c0) at src/gdb/frame.c:970 #157061 0x0000561d6a1bf54c in get_frame_pc (frame=0x561d6b19fa90) at src/gdb/frame.c:2625 #157062 0x0000561d6a1bf63e in get_frame_address_in_block (this_frame=0x561d6b19fa90) at src/gdb/frame.c:2655 #157063 0x0000561d6a0cae7f in dwarf2_frame_cache (this_frame=0x561d6b19fa90, this_cache=0x561d6b19faa8) at src/gdb/dwarf2/frame.c:1010 #157064 0x0000561d6a0cb928 in dwarf2_frame_this_id (this_frame=0x561d6b19fa90, this_cache=0x561d6b19faa8, this_id=0x561d6b19faf0) at src/gdb/dwarf2/frame.c:1227 #157065 0x0000561d6a1baf72 in compute_frame_id (fi=0x561d6b19fa90) at src/gdb/frame.c:588 #157066 0x0000561d6a1bb16e in get_frame_id (fi=0x561d6b19fa90) at src/gdb/frame.c:636 #157067 0x0000561d6a1bb224 in get_stack_frame_id (next_frame=0x561d6b19fa90) at src/gdb/frame.c:650 #157068 0x0000561d6a26ecd0 in insert_hp_step_resume_breakpoint_at_frame (return_frame=0x561d6b19fa90) at src/gdb/infrun.c:7809 #157069 0x0000561d6a26b88a in handle_signal_stop (ecs=0x7ffc67022830) at src/gdb/infrun.c:6428 #157070 0x0000561d6a269d81 in handle_inferior_event (ecs=0x7ffc67022830) at src/gdb/infrun.c:5741 #157071 0x0000561d6a265bd0 in fetch_inferior_event () at src/gdb/infrun.c:4120 #157072 0x0000561d6a244c24 in inferior_event_handler (event_type=INF_REG_EVENT) at src/gdb/inf-loop.c:41 #157073 0x0000561d6a435cc4 in remote_async_serial_handler (scb=0x561d6b4a8990, context=0x561d6b4a4c48) at src/gdb/remote.c:14403 #157074 0x0000561d6a460bc5 in run_async_handler_and_reschedule (scb=0x561d6b4a8990) at src/gdb/ser-base.c:138 #157075 0x0000561d6a460cae in fd_event (error=0, context=0x561d6b4a8990) at src/gdb/ser-base.c:189 #157076 0x0000561d6a76a191 in handle_file_event (file_ptr=0x561d6b233ae0, ready_mask=1) at src/gdbsupport/event-loop.cc:575 #157077 0x0000561d6a76a743 in gdb_wait_for_event (block=1) at src/gdbsupport/event-loop.cc:701 #157078 0x0000561d6a7694ee in gdb_do_one_event () at src/gdbsupport/event-loop.cc:237 #157079 0x0000561d6a2df16b in start_event_loop () at src/gdb/main.c:421 #157080 0x0000561d6a2df2b6 in captured_command_loop () at src/gdb/main.c:481 #157081 0x0000561d6a2e0d16 in captured_main (data=0x7ffc67022bd0) at src/gdb/main.c:1353 #157082 0x0000561d6a2e0da8 in gdb_main (args=0x7ffc67022bd0) at src/gdb/main.c:1370 #157083 0x0000561d69eb3d82 in main (argc=13, argv=0x7ffc67022cf8, envp=0x7ffc67022d68) at src/gdb/gdb.c:33 This was caused by exists_non_stop_target flushing the frame cache via scoped_restore_current_thread/switch_to_thread, while we're in the middle of unwinding. Fix this by making exists_non_stop_target only switch the inferior, like done in target_pass_ctrlc. The annota1.exp change is necessary because we'd get a regression otherwise: @@ -238,8 +238,6 @@ Continuing. \032\032breakpoints-invalid -\032\032frames-invalid - \032\032breakpoint 3 Breakpoint 3, @@ -276,7 +274,7 @@ printf.c \032\032pre-prompt (gdb) \032\032prompt -PASS: gdb.base/annota1.exp: continue to printf +FAIL: gdb.base/annota1.exp: continue to printf ... because this patch avoids flushing the frame cache that lead to that missing frames-invalid. We still need to match frames-invalid because against gdbserver + "maint set target non-stop on", some other code path flushes the frame cache resulting in the annotation being emitted anyway. gdb/ChangeLog: yyyy-mm-dd Pedro Alves <pedro@palves.net> * target.c (exists_non_stop_target): Use scoped_restore_current_inferior and set_current_inferior instead of scoped_restore_current_thread / switch_to_inferior_no_thread. Change-Id: I8402483ee755e64e54d8b7c4a67c177557f569bd
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.
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