- Improves error handling upon GDB connect

- switch to synchronous halt during connect. This fixes the bug
  where poll() was not invoked between halt() and servicing the
  'g' register packet
- halt() no longer returns error code when target is already halted, just
  logs a warning. Only the halt() implementation can say anything
  meaningful about why a halt() failed, so error messages are pushed
  up to halt()
- fixed soft_reset_halt infinite loop bug in arm7_9_common.c. The rest
  of the implementations are still busted.
- by using USER() instead of command_print() the log gets the 
  source + line #. Nice.
- no longer invoke exit() if soft_reset_halt fails. A reset can often 
  fix the problem.

git-svn-id: svn://svn.berlios.de/openocd/trunk@475 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/target/arm11.c

@@ -735,8 +735,8 @@ int arm11_halt(struct target_s *target)
 
     if (target->state == TARGET_HALTED)
     {
-	WARNING("target was already halted");
-	return ERROR_TARGET_ALREADY_HALTED;
+		WARNING("target was already halted");
+		return ERROR_OK;
     }
 
     if (arm11->trst_active)
@@ -1044,7 +1044,8 @@ int arm11_get_gdb_reg_list(struct target_s *target, struct reg_s **reg_list[], i
 
     if (target->state != TARGET_HALTED)
     {
-	return ERROR_TARGET_NOT_HALTED;
+    	ERROR("Target not halted");    	
+		return ERROR_TARGET_NOT_HALTED;
     }
 	
     *reg_list_size  = ARM11_GDB_REGISTER_COUNT;