Use exceptions and cleanups in gdbserver

This commit replaces the hacky "exception" system in gdbserver with
the exceptions and cleanups subsystem from GDB.

Only the catch/cleanup code in what was "main" has been updated to
use the new system.  Other parts of gdbserver can now be converted
to use TRY_CATCH and cleanups on an as-needed basis.

A side-effect of this commit is that some error messages will change
slightly, and in cases with multiple errors the error messages will
be printed in a different order.

gdb/gdbserver/ChangeLog:

	* server.h (setjmp.h): Do not include.
	(toplevel): Do not declare.
	(common-exceptions.h): Include.
	(cleanups.h): Likewise.
	* server.c (toplevel): Do not define.
	(exit_code): New static global.
	(detach_or_kill_for_exit_cleanup): New function.
	(main): New function.  Original main renamed to...
	(captured_main): New function.
	* utils.c (verror) [!IN_PROCESS_AGENT]: Use throw_verror.

1 files changed, 3 insertions, 7 deletions

diff --git a/gdb/gdbserver/utils.c b/gdb/gdbserver/utils.c
index e310b9e..2351a46 100644
--- a/gdb/gdbserver/utils.c
+++ b/gdb/gdbserver/utils.c
@@ -76,17 +76,13 @@ perror_with_name (const char *string)
 void
 verror (const char *string, va_list args)
 {
-#ifndef IN_PROCESS_AGENT
-  extern jmp_buf toplevel;
-#endif
-
+#ifdef IN_PROCESS_AGENT
   fflush (stdout);
   vfprintf (stderr, string, args);
   fprintf (stderr, "\n");
-#ifndef IN_PROCESS_AGENT
-  longjmp (toplevel, 1);
-#else
   exit (1);
+#else
+  throw_verror (GENERIC_ERROR, string, args);
 #endif
 }