1 files changed, 85 insertions, 0 deletions
diff --git a/gdbsupport/gdb_wait.c b/gdbsupport/gdb_wait.c
new file mode 100644
index 00000000000..32139949c62
--- /dev/null
+++ b/gdbsupport/gdb_wait.c
@@ -0,0 +1,85 @@
+/* Support code for standard wait macros in gdb_wait.h.
+
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "common-defs.h"
+
+#include "gdb_wait.h"
+
+#ifdef __MINGW32__
+
+/* The underlying idea is that when a Windows program is terminated by
+   a fatal exception, its exit code is the value of that exception, as
+   defined by the various EXCEPTION_* symbols in the Windows API
+   headers.  We thus emulate WTERMSIG etc. by translating the fatal
+   exception codes to more-or-less equivalent Posix signals.
+
+   The translation below is not perfect, because a program could
+   legitimately exit normally with a status whose value happens to
+   have the high bits set, but that's extremely rare, to say the
+   least, and it is deemed such a negligibly small probability of
+   false positives is justified by the utility of reporting the
+   terminating signal in the "normal" cases.  */
+
+# include <signal.h>
+
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>		/* for EXCEPTION_* constants */
+
+struct xlate_status
+{
+  /* The exit status (actually, fatal exception code).  */
+  DWORD status;
+
+  /* The corresponding signal value.  */
+  int sig;
+};
+
+int
+windows_status_to_termsig (unsigned long status)
+{
+  static const xlate_status status_xlate_tbl[] =
+    {
+     {EXCEPTION_ACCESS_VIOLATION,	  SIGSEGV},
+     {EXCEPTION_IN_PAGE_ERROR,		  SIGSEGV},
+     {EXCEPTION_INVALID_HANDLE,		  SIGSEGV},
+     {EXCEPTION_ILLEGAL_INSTRUCTION,	  SIGILL},
+     {EXCEPTION_NONCONTINUABLE_EXCEPTION, SIGILL},
+     {EXCEPTION_ARRAY_BOUNDS_EXCEEDED,	  SIGSEGV},
+     {EXCEPTION_FLT_DENORMAL_OPERAND,	  SIGFPE},
+     {EXCEPTION_FLT_DIVIDE_BY_ZERO,	  SIGFPE},
+     {EXCEPTION_FLT_INEXACT_RESULT,	  SIGFPE},
+     {EXCEPTION_FLT_INVALID_OPERATION,	  SIGFPE},
+     {EXCEPTION_FLT_OVERFLOW,		  SIGFPE},
+     {EXCEPTION_FLT_STACK_CHECK,	  SIGFPE},
+     {EXCEPTION_FLT_UNDERFLOW,		  SIGFPE},
+     {EXCEPTION_INT_DIVIDE_BY_ZERO,	  SIGFPE},
+     {EXCEPTION_INT_OVERFLOW,		  SIGFPE},
+     {EXCEPTION_PRIV_INSTRUCTION,	  SIGILL},
+     {EXCEPTION_STACK_OVERFLOW,		  SIGSEGV},
+     {CONTROL_C_EXIT,			  SIGTERM}
+    };
+
+  for (const xlate_status &x : status_xlate_tbl)
+    if (x.status == status)
+      return x.sig;
+
+  return -1;
+}
+
+#endif	/* __MINGW32__ */