btrace: pretend we're not replaying when generating a core file
When generating a core file using the "generate-core-file" command while replaying with the btrace record target, we won't be able to access all registers and all memory. This leads to the following assertion: gdb/regcache.c:1034: internal-error: regcache_raw_supply: Assertion `regnum >= 0 && regnum < regcache->descr->nr_raw_registers' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. Quit this debugging session? (y or n) FAIL: gdb.btrace/gcore.exp: generate-core-file core (GDB internal error) Resyncing due to internal error. Pretend that we are not replaying while generating a core file. This will forward fetch and store registers as well as xfer memory calls to the target beneath. gdb/ * record-btrace.c (record_btrace_generating_corefile) (record_btrace_prepare_to_generate_core) (record_btrace_done_generating_core): New. (record_btrace_xfer_partial, record_btrace_fetch_registers) (record_btrace_store_registers, record_btrace_prepare_to_store): Forward request when generating a core file. (record_btrace_open): Set record_btrace_generating_corefile to zero. (init_record_btrace_ops): Set to_prepare_to_generate_core and to_done_generating_core. testsuite/ * gdb.btrace/gcore.exp: New.
This commit is contained in:
parent
5fff78c4e0
commit
aef929023e
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@ -1,3 +1,15 @@
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2014-06-25 Markus Metzger <markus.t.metzger@intel.com>
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* record-btrace.c (record_btrace_generating_corefile)
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(record_btrace_prepare_to_generate_core)
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(record_btrace_done_generating_core): New.
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(record_btrace_xfer_partial, record_btrace_fetch_registers)
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(record_btrace_store_registers, record_btrace_prepare_to_store):
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Forward request when generating a core file.
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(record_btrace_open): Set record_btrace_generating_corefile to zero.
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(init_record_btrace_ops): Set to_prepare_to_generate_core and
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to_done_generating_core.
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2014-06-25 Markus Metzger <markus.t.metzger@intel.com>
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* target.h (target_ops) <to_prepare_to_generate_core>
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@ -68,6 +68,9 @@ static enum exec_direction_kind record_btrace_resume_exec_dir = EXEC_FORWARD;
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/* The async event handler for reverse/replay execution. */
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static struct async_event_handler *record_btrace_async_inferior_event_handler;
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/* A flag indicating that we are currently generating a core file. */
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static int record_btrace_generating_corefile;
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/* Print a record-btrace debug message. Use do ... while (0) to avoid
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ambiguities when used in if statements. */
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@ -221,6 +224,7 @@ record_btrace_open (char *args, int from_tty)
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record_btrace_async_inferior_event_handler
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= create_async_event_handler (record_btrace_handle_async_inferior_event,
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NULL);
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record_btrace_generating_corefile = 0;
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observer_notify_record_changed (current_inferior (), 1);
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@ -854,6 +858,7 @@ record_btrace_xfer_partial (struct target_ops *ops, enum target_object object,
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/* Filter out requests that don't make sense during replay. */
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if (replay_memory_access == replay_memory_access_read_only
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&& !record_btrace_generating_corefile
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&& record_btrace_is_replaying (ops))
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{
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switch (object)
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@ -969,7 +974,7 @@ record_btrace_fetch_registers (struct target_ops *ops,
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gdb_assert (tp != NULL);
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replay = tp->btrace.replay;
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if (replay != NULL)
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if (replay != NULL && !record_btrace_generating_corefile)
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{
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const struct btrace_insn *insn;
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struct gdbarch *gdbarch;
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@ -1010,7 +1015,7 @@ record_btrace_store_registers (struct target_ops *ops,
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{
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struct target_ops *t;
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if (record_btrace_is_replaying (ops))
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if (!record_btrace_generating_corefile && record_btrace_is_replaying (ops))
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error (_("This record target does not allow writing registers."));
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gdb_assert (may_write_registers != 0);
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@ -1033,7 +1038,7 @@ record_btrace_prepare_to_store (struct target_ops *ops,
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{
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struct target_ops *t;
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if (record_btrace_is_replaying (ops))
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if (!record_btrace_generating_corefile && record_btrace_is_replaying (ops))
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return;
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for (t = ops->beneath; t != NULL; t = t->beneath)
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@ -1939,6 +1944,22 @@ record_btrace_execution_direction (struct target_ops *self)
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return record_btrace_resume_exec_dir;
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}
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/* The to_prepare_to_generate_core target method. */
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static void
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record_btrace_prepare_to_generate_core (struct target_ops *self)
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{
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record_btrace_generating_corefile = 1;
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}
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/* The to_done_generating_core target method. */
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static void
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record_btrace_done_generating_core (struct target_ops *self)
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{
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record_btrace_generating_corefile = 0;
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}
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/* Initialize the record-btrace target ops. */
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static void
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@ -1983,6 +2004,8 @@ init_record_btrace_ops (void)
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ops->to_can_execute_reverse = record_btrace_can_execute_reverse;
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ops->to_decr_pc_after_break = record_btrace_decr_pc_after_break;
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ops->to_execution_direction = record_btrace_execution_direction;
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ops->to_prepare_to_generate_core = record_btrace_prepare_to_generate_core;
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ops->to_done_generating_core = record_btrace_done_generating_core;
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ops->to_stratum = record_stratum;
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ops->to_magic = OPS_MAGIC;
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}
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@ -1,3 +1,7 @@
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2014-06-25 Markus Metzger <markus.t.metzger@intel.com>
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* gdb.btrace/gcore.exp: New.
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2014-06-23 Pedro Alves <palves@redhat.com>
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* gdb.base/watchpoint-reuse-slot.c: New file.
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@ -0,0 +1,41 @@
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# This testcase is part of GDB, the GNU debugger.
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#
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# Copyright 2014 Free Software Foundation, Inc.
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#
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# Contributed by Intel Corp. <markus.t.metzger@intel.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# check for btrace support
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if { [skip_btrace_tests] } { return -1 }
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# start inferior
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standard_testfile x86-record_goto.S
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if [prepare_for_testing gcore.exp $testfile $srcfile] {
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return -1
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}
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if ![runto_main] {
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return -1
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}
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# trace the call to the test function
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gdb_test_no_output "record btrace"
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gdb_test "next" ".*main\.3.*"
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# start replaying
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gdb_test "record goto begin" ".*main\.2.*"
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# generate a core file - this used to assert
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gdb_test "generate-core-file core" "Saved corefile core"
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