From: Pedro Alves <palves@redhat.com>
Date: Sat, 4 Jul 2009 18:13:28 +0000 (+0000)
Subject: 	* win32-i386-low.c (i386_get_thread_context): Handle systems that
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=912cf4ba32021ba75d11c496e9ffd17bbb15bc64;p=binutils-gdb.git

	* win32-i386-low.c (i386_get_thread_context): Handle systems that
	don't support CONTEXT_EXTENDED_REGISTERS.
	(i386_win32_breakpoint, i386_win32_breakpoint_len): New.
	(the_low_target): Install them.
	* win32-low.c (get_child_debug_event): Handle WaitForDebugEvent
	failing with ERROR_PIPE_NOT_CONNECTED.
---

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 86fe1746ae6..4c3a3a1d3e6 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,13 @@
+2009-07-04  Danny Backx  <dannybackx@users.sourceforge.net>
+	    Pedro Alves  <pedro@codesourcery.com>
+
+	* win32-i386-low.c (i386_get_thread_context): Handle systems that
+	don't support CONTEXT_EXTENDED_REGISTERS.
+	(i386_win32_breakpoint, i386_win32_breakpoint_len): New.
+	(the_low_target): Install them.
+	* win32-low.c (get_child_debug_event): Handle WaitForDebugEvent
+	failing with ERROR_PIPE_NOT_CONNECTED.
+
 2009-06-30  Doug Evans  <dje@google.com>
 	    Pierre Muller  <muller@ics.u-strasbg.fr>
 
diff --git a/gdb/gdbserver/win32-i386-low.c b/gdb/gdbserver/win32-i386-low.c
index 7e058a58b56..b610631f494 100644
--- a/gdb/gdbserver/win32-i386-low.c
+++ b/gdb/gdbserver/win32-i386-low.c
@@ -129,13 +129,28 @@ i386_initial_stuff (void)
 static void
 i386_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
 {
-  th->context.ContextFlags = \
-    CONTEXT_FULL | \
-    CONTEXT_FLOATING_POINT | \
-    CONTEXT_EXTENDED_REGISTERS | \
-    CONTEXT_DEBUG_REGISTERS;
+  /* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
+     the system doesn't support extended registers.  */
+  static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;
 
-  GetThreadContext (th->h, &th->context);
+ again:
+  th->context.ContextFlags = (CONTEXT_FULL
+			      | CONTEXT_FLOATING_POINT
+			      | CONTEXT_DEBUG_REGISTERS
+			      | extended_registers);
+
+  if (!GetThreadContext (th->h, &th->context))
+    {
+      DWORD e = GetLastError ();
+
+      if (extended_registers && e == ERROR_INVALID_PARAMETER)
+	{
+	  extended_registers = 0;
+	  goto again;
+	}
+
+      error ("GetThreadContext failure %ld\n", (long) e);
+    }
 
   debug_registers_changed = 0;
 
@@ -283,6 +298,9 @@ i386_store_inferior_register (win32_thread_info *th, int r)
   collect_register (r, context_offset);
 }
 
+static const unsigned char i386_win32_breakpoint = 0xcc;
+#define i386_win32_breakpoint_len 1
+
 struct win32_target_ops the_low_target = {
   init_registers_i386,
   sizeof (mappings) / sizeof (mappings[0]),
@@ -293,8 +311,8 @@ struct win32_target_ops the_low_target = {
   i386_fetch_inferior_register,
   i386_store_inferior_register,
   i386_single_step,
-  NULL, /* breakpoint */
-  0, /* breakpoint_len */
+  &i386_win32_breakpoint,
+  i386_win32_breakpoint_len,
   i386_insert_point,
   i386_remove_point,
   i386_stopped_by_watchpoint,
diff --git a/gdb/gdbserver/win32-low.c b/gdb/gdbserver/win32-low.c
index a1380f6030b..bcf16b2ece3 100644
--- a/gdb/gdbserver/win32-low.c
+++ b/gdb/gdbserver/win32-low.c
@@ -1407,7 +1407,22 @@ get_child_debug_event (struct target_waitstatus *ourstatus)
 	 interruption, but high enough so gdbserver doesn't become a
 	 bottleneck.  */
       if (!WaitForDebugEvent (&current_event, 250))
-	return 0;
+        {
+	  DWORD e  = GetLastError();
+
+	  if (e == ERROR_PIPE_NOT_CONNECTED)
+	    {
+	      /* This will happen if the loader fails to succesfully
+		 load the application, e.g., if the main executable
+		 tries to pull in a non-existing export from a
+		 DLL.  */
+	      ourstatus->kind = TARGET_WAITKIND_EXITED;
+	      ourstatus->value.integer = 1;
+	      return 1;
+	    }
+
+	  return 0;
+        }
     }
 
  gotevent: