Windows gdb+gdbserver: Share exit status logic

Move the exit status logic added by commit 559e7e5056 ("Improve
process exit status macros on MinGW") from both GDB and GDBserver to a
shared routine used by both.

The next patch extends this routine with Cygwin-specific decoding.

Change-Id: I4bf08c6beff0d1688064a81d49bbdd615643735e

gdb/nat/windows-nat.c

diff --git a/gdb/nat/windows-nat.c b/gdb/nat/windows-nat.c
index b093acd..92f9394 100644
--- a/gdb/nat/windows-nat.c
+++ b/gdb/nat/windows-nat.c
@@ -18,6 +18,8 @@
 
 #include "nat/windows-nat.h"
 #include "gdbsupport/common-debug.h"
+#include "gdbsupport/gdb_signals.h"
+#include "gdbsupport/gdb_wait.h"
 #include "target/target.h"
 
 #undef GetModuleFileNameEx
@@ -694,6 +696,28 @@ windows_process_info::add_all_dlls ()
 
 /* See nat/windows-nat.h.  */
 
+target_waitstatus
+windows_process_info::exit_process_to_target_status
+  (const EXIT_PROCESS_DEBUG_INFO &info)
+{
+  DWORD exit_code = info.dwExitCode;
+  target_waitstatus tstatus;
+
+  /* If the exit status looks like a fatal exception, but we don't
+     recognize the exception's code, make the original exit status
+     value available, to avoid losing information.  */
+  int exit_signal
+    = WIFSIGNALED (exit_code) ? WTERMSIG (exit_code) : -1;
+  if (exit_signal == -1)
+    tstatus.set_exited (exit_code);
+  else
+    tstatus.set_signalled (gdb_signal_from_host (exit_signal));
+
+  return tstatus;
+}
+
+/* See nat/windows-nat.h.  */
+
 std::string
 event_code_to_string (DWORD event_code)
 {

gdb/nat/windows-nat.h

diff --git a/gdb/nat/windows-nat.h b/gdb/nat/windows-nat.h
index 2b23978..d842fa8 100644
--- a/gdb/nat/windows-nat.h
+++ b/gdb/nat/windows-nat.h
@@ -315,6 +315,12 @@ struct windows_process_info
       });
   }
 
+  /* Convert an EXIT_PROCESS_DEBUG_EVENT payload to a target wait
+     status.  */
+
+  target_waitstatus exit_process_to_target_status
+    (const EXIT_PROCESS_DEBUG_INFO &info);
+
 private:
 
   /* Handle MS_VC_EXCEPTION when processing a stop.  MS_VC_EXCEPTION is

gdb/windows-nat.c

diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index a7cf869..1f82dee 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -62,7 +62,6 @@
 #include "complaints.h"
 #include "gdbsupport/gdb_tilde_expand.h"
 #include "gdbsupport/pathstuff.h"
-#include "gdbsupport/gdb_wait.h"
 #include "gdbsupport/symbol.h"
 #include "inf-loop.h"
 
@@ -1610,17 +1609,9 @@ windows_nat_target::get_windows_debug_event
 	}
       else if (windows_process->saw_create == 1)
 	{
-	  DWORD exit_status = current_event->u.ExitProcess.dwExitCode;
-	  /* If the exit status looks like a fatal exception, but we
-	     don't recognize the exception's code, make the original
-	     exit status value available, to avoid losing
-	     information.  */
-	  int exit_signal
-	    = WIFSIGNALED (exit_status) ? WTERMSIG (exit_status) : -1;
-	  if (exit_signal == -1)
-	    ourstatus->set_exited (exit_status);
-	  else
-	    ourstatus->set_signalled (gdb_signal_from_host (exit_signal));
+	  *ourstatus
+	    = (windows_process->exit_process_to_target_status
+	       (current_event->u.ExitProcess));
 
 	  thread_id = current_event->dwThreadId;
 

gdbserver/win32-low.cc

diff --git a/gdbserver/win32-low.cc b/gdbserver/win32-low.cc
index 1931c66..511e034 100644
--- a/gdbserver/win32-low.cc
+++ b/gdbserver/win32-low.cc
@@ -33,7 +33,6 @@
 #include <process.h>
 #include "gdbsupport/gdb_tilde_expand.h"
 #include "gdbsupport/common-inferior.h"
-#include "gdbsupport/gdb_wait.h"
 
 using namespace windows_nat;
 
@@ -1061,18 +1060,9 @@
       break;
 
     case EXIT_PROCESS_DEBUG_EVENT:
-      {
-	DWORD exit_status = current_event->u.ExitProcess.dwExitCode;
-	/* If the exit status looks like a fatal exception, but we
-	   don't recognize the exception's code, make the original
-	   exit status value available, to avoid losing information.  */
-	int exit_signal
-	  = WIFSIGNALED (exit_status) ? WTERMSIG (exit_status) : -1;
-	if (exit_signal == -1)
-	  ourstatus->set_exited (exit_status);
-	else
-	  ourstatus->set_signalled (gdb_signal_from_host (exit_signal));
-      }
+      *ourstatus
+	= (windows_process.exit_process_to_target_status
+	   (current_event->u.ExitProcess));
       continue_last_debug_event (DBG_CONTINUE, debug_threads);
       break;