Multi-target support

[deliverable/binutils-gdb.git] / gdb / event-top.c

diff --git a/gdb/event-top.c b/gdb/event-top.c
index 0b05b2f85a52e6ca0a5c79885f8ed30bcf24e766..3f10b21280d6626382932b30ffce702c9c814167 100644 (file)
--- a/gdb/event-top.c
+++ b/gdb/event-top.c
@@ -1,6 +1,6 @@
 /* Top level stuff for GDB, the GNU debugger.
 
-   Copyright (C) 1999-2019 Free Software Foundation, Inc.
+   Copyright (C) 1999-2020 Free Software Foundation, Inc.
 
    Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
 
@@ -40,6 +40,7 @@
 #include "gdbsupport/buffer.h"
 #include "ser-event.h"
 #include "gdb_select.h"
+#include "gdbsupport/gdb-sigmask.h"
 
 /* readline include files.  */
 #include "readline/readline.h"
@@ -421,7 +422,7 @@ display_gdb_prompt (const char *new_prompt)
 }
 
 /* Return the top level prompt, as specified by "set prompt", possibly
-   overriden by the python gdb.prompt_hook hook, and then composed
+   overridden by the python gdb.prompt_hook hook, and then composed
    with the prompt prefix and suffix (annotations).  */
 
 static std::string
@@ -847,6 +848,45 @@ gdb_readline_no_editing_callback (gdb_client_data client_data)
 }
 \f
 
+/* See event-top.h.  */
+
+thread_local void (*thread_local_segv_handler) (int);
+
+static void handle_sigsegv (int sig);
+
+/* Install the SIGSEGV handler.  */
+static void
+install_handle_sigsegv ()
+{
+#if defined (HAVE_SIGACTION)
+  struct sigaction sa;
+  sa.sa_handler = handle_sigsegv;
+  sigemptyset (&sa.sa_mask);
+#ifdef HAVE_SIGALTSTACK
+  sa.sa_flags = SA_ONSTACK;
+#else
+  sa.sa_flags = 0;
+#endif
+  sigaction (SIGSEGV, &sa, nullptr);
+#else
+  signal (SIGSEGV, handle_sigsegv);
+#endif
+}
+
+/* Handler for SIGSEGV.  */
+
+static void
+handle_sigsegv (int sig)
+{
+  install_handle_sigsegv ();
+
+  if (thread_local_segv_handler == nullptr)
+    abort ();                  /* ARI: abort */
+  thread_local_segv_handler (sig);
+}
+
+\f
+
 /* The serial event associated with the QUIT flag.  set_quit_flag sets
    this, and check_quit_flag clears it.  Used by interruptible_select
    to be able to do interruptible I/O with no race with the SIGINT
@@ -914,6 +954,8 @@ async_init_signals (void)
   sigtstp_token =
     create_async_signal_handler (async_sigtstp_handler, NULL);
 #endif
+
+  install_handle_sigsegv ();
 }
 
 /* See defs.h.  */
@@ -1095,12 +1137,16 @@ async_disconnect (gdb_client_data arg)
       exception_print (gdb_stderr, exception);
     }
 
-  try
-    {
-      pop_all_targets ();
-    }
-  catch (const gdb_exception &exception)
+  for (inferior *inf : all_inferiors ())
     {
+      switch_to_inferior_no_thread (inf);
+      try
+       {
+         pop_all_targets ();
+       }
+      catch (const gdb_exception &exception)
+       {
+       }
     }
 
   signal (SIGHUP, SIG_DFL);    /*FIXME: ???????????  */
@@ -1127,7 +1173,7 @@ async_sigtstp_handler (gdb_client_data arg)
     sigset_t zero;
 
     sigemptyset (&zero);
-    sigprocmask (SIG_SETMASK, &zero, 0);
+    gdb_sigmask (SIG_SETMASK, &zero, 0);
   }
 #elif HAVE_SIGSETMASK
   sigsetmask (0);
@@ -1152,7 +1198,7 @@ handle_sigfpe (int sig)
   signal (sig, handle_sigfpe);
 }
 
-/* Event loop will call this functin to process a SIGFPE.  */
+/* Event loop will call this function to process a SIGFPE.  */
 static void
 async_float_handler (gdb_client_data arg)
 {