diff options
| -rw-r--r-- | gdb/ChangeLog | 6 | ||||
| -rw-r--r-- | gdb/cp-support.c | 19 | ||||
| -rw-r--r-- | gdb/gdbsupport/gdb_setjmp.h | 6 |
3 files changed, 28 insertions, 3 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index d11dbfb..ba028ed 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,9 @@ +2019-10-16 Christian Biesinger <cbiesinger@google.com> + + * gdbsupport/gdb_setjmp.h (SIGSETJMP): Allow passing in the value to + pass on to sigsetjmp's second argument. + * cp-support.c (gdb_demangle): Unblock SIGSEGV if we caught a crash. + 2019-10-16 Keith Seitz <keiths@redhat.com> PR gdb/23567 diff --git a/gdb/cp-support.c b/gdb/cp-support.c index cd732b6..253369b 100644 --- a/gdb/cp-support.c +++ b/gdb/cp-support.c @@ -1539,7 +1539,16 @@ gdb_demangle (const char *name, int options) ofunc = signal (SIGSEGV, gdb_demangle_signal_handler); #endif - crash_signal = SIGSETJMP (gdb_demangle_jmp_buf); + /* The signal handler may keep the signal blocked when we longjmp out + of it. If we have sigprocmask, we can use it to unblock the signal + afterwards and we can avoid the performance overhead of saving the + signal mask just in case the signal gets triggered. Otherwise, just + tell sigsetjmp to save the mask. */ +#ifdef HAVE_SIGPROCMASK + crash_signal = SIGSETJMP (gdb_demangle_jmp_buf, 0); +#else + crash_signal = SIGSETJMP (gdb_demangle_jmp_buf, 1); +#endif } #endif @@ -1559,6 +1568,14 @@ gdb_demangle (const char *name, int options) { static int error_reported = 0; +#ifdef HAVE_SIGPROCMASK + /* If we got the signal, SIGSEGV may still be blocked; restore it. */ + sigset_t segv_sig_set; + sigemptyset (&segv_sig_set); + sigaddset (&segv_sig_set, SIGSEGV); + sigprocmask (SIG_UNBLOCK, &segv_sig_set, NULL); +#endif + if (!error_reported) { std::string short_msg diff --git a/gdb/gdbsupport/gdb_setjmp.h b/gdb/gdbsupport/gdb_setjmp.h index d4ebbfa..4995970 100644 --- a/gdb/gdbsupport/gdb_setjmp.h +++ b/gdb/gdbsupport/gdb_setjmp.h @@ -23,11 +23,13 @@ #ifdef HAVE_SIGSETJMP #define SIGJMP_BUF sigjmp_buf -#define SIGSETJMP(buf) sigsetjmp((buf), 1) +#define SIGSETJMP(buf,val) sigsetjmp((buf), val) #define SIGLONGJMP(buf,val) siglongjmp((buf), (val)) #else #define SIGJMP_BUF jmp_buf -#define SIGSETJMP(buf) setjmp(buf) +/* We ignore val here because that's safer and avoids having to check + whether _setjmp exists. */ +#define SIGSETJMP(buf,val) setjmp(buf) #define SIGLONGJMP(buf,val) longjmp((buf), (val)) #endif |