a911d87ad7
This commit merges both the registers and $_siginfo "thread running/executing" checks into a single function. Accessing $_siginfo from a "catch signal" breakpoint condition doesn't work. The condition always fails with "Selected thread is running": (gdb) catch signal Catchpoint 3 (standard signals) (gdb) condition $bpnum $_siginfo.si_signo == 5 (gdb) continue Continuing. Error in testing breakpoint condition: Selected thread is running. Catchpoint 3 (signal SIGUSR1), 0x0000003615e35877 in __GI_raise (sig=10) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56 56 return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig); (gdb) When accessing the $_siginfo object, we check whether the thread is marked running (external/public) state and refuse the access if so. This is so "print $_siginfo" at the prompt fails nicelly when the current thread is running. While evaluating breakpoint conditionals, we haven't decided yet whether the thread is going to stop, so is_running still returns true, and we thus always error out. Evaluating an expression that requires registers access is really conceptually the same -- we could think of $_siginfo as a pseudo register. However, in that case we check whether the thread is marked executing (internal/private state), not running (external/public state). Changing the $_siginfo validation to check is_executing as well fixes the bug in question. Note that checking is_executing is not fully correct, not even for registers. See PR 19389. However, I think this is the lesser of two evils and ends up as an improvement. We at least now have a single place to fix. Tested on x86_64 GNU/Linux. gdb/ChangeLog: 2016-01-13 Pedro Alves <palves@redhat.com> PR breakpoints/19388 * frame.c (get_current_frame): Use validate_registers_access. * gdbthread.h (validate_registers_access): Declare. * infrun.c (validate_siginfo_access): Delete. (siginfo_value_read, siginfo_value_write): Use validate_registers_access. * thread.c (validate_registers_access): New function. gdb/testsuite/ChangeLog: 2016-01-13 Pedro Alves <palves@redhat.com> PR breakpoints/19388 * gdb.base/catch-signal-siginfo-cond.c: New file. * gdb.base/catch-signal-siginfo-cond.exp: New file.
61 lines
2.1 KiB
Text
61 lines
2.1 KiB
Text
# Copyright 2015-2016 Free Software Foundation, Inc.
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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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# Regression test for PR19388. Make sure we can access $_siginfo in a
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# "catch signal" condition. A buggy GDB would fail with:
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#
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# (gdb) continue
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# Continuing.
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# Error in testing breakpoint condition:
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# Selected thread is running.
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#
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# Catchpoint 3 (signal SIGUSR1), 0x0000003615e35877 in __GI_raise (sig=10) at raise.c:56
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# 56 return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);
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# (gdb) FAIL: gdb.base/catch-signal-siginfo-cond.exp: continue
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if [target_info exists gdb,nosignals] {
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verbose "Skipping catch-signal-siginfo-cond.exp because of nosignals."
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return -1
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}
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if { ![supports_get_siginfo_type] } {
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verbose "Skipping catch-signal-siginfo-cond.exp because of lack of support."
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return -1
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}
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standard_testfile
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if { [prepare_for_testing "failed to prepare" "${testfile}" $srcfile {debug}] } {
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return -1
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}
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if ![runto_main] then {
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fail "Can't run to main"
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return -1
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}
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gdb_breakpoint [gdb_get_line_number "set breakpoint here"]
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gdb_test "catch signal"
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# It's OK to refer to standard Unix signal numbers 1-15 by number.
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# SIGUSR1 == 10. The catchpoint should not cause a stop.
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gdb_test "condition \$bpnum \$_siginfo.si_signo == 11"
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gdb_test "continue" "set breakpoint here.*" "continue: catchpoint does not trigger"
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# This time the catchpoint should cause a stop.
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gdb_test "condition \$bpnum \$_siginfo.si_signo == 10"
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gdb_test "continue" "Catchpoint .*signal SIGUSR1.*" "continue: catchpoint triggers"
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