From 71f4beb0cd6196a3dcd7d1aacb82645debe745b2 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 15 Apr 1998 15:08:49 +0000
Subject: Stack check now initialized as part of initial extension set.

---
 cpukit/libmisc/stackchk/README     | 15 ++++++++++++++
 cpukit/libmisc/stackchk/check.c    |  8 ++++++++
 cpukit/libmisc/stackchk/stackchk.h | 42 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)

(limited to 'cpukit')

diff --git a/cpukit/libmisc/stackchk/README b/cpukit/libmisc/stackchk/README
index 20e76f07bc..0f6e2f2b10 100644
--- a/cpukit/libmisc/stackchk/README
+++ b/cpukit/libmisc/stackchk/README
@@ -2,12 +2,27 @@
 #  $Id$
 #
 
+Introduction
+============
+
 This directory contains a stack bounds checker.  It provides two
 primary features:
 
    + check for stack overflow at each context switch
    + provides an educated guess at each task's stack usage
 
+Enabling
+========
+
+Add the stack checker extension to the initial user extension set.
+If using confdefs.h to build your configuration table, this is
+as simple as adding -DSTACK_CHECK_ON to the gcc command line which
+compiles the file defining the configuration table.  In the RTEMS
+test suites and samples, this is always init.c
+
+Background
+==========
+
 The stack overflow check at context switch works by looking for
 a 16 byte pattern at the logical end of the stack to be corrupted.
 The "guesser" assumes that the entire stack was prefilled with a known
diff --git a/cpukit/libmisc/stackchk/check.c b/cpukit/libmisc/stackchk/check.c
index a226e926ea..1f1923f1d8 100644
--- a/cpukit/libmisc/stackchk/check.c
+++ b/cpukit/libmisc/stackchk/check.c
@@ -175,12 +175,14 @@ void Stack_check_Initialize( void )
       p[3] = 0x600D0D06;
   };
 
+#if 0
   status = rtems_extension_create(
     rtems_build_name( 'S', 'T', 'C', 'K' ),
     &Stack_check_Extension_table,
     &id_ignored
   );
   assert ( status == RTEMS_SUCCESSFUL );
+#endif
 
   Stack_check_Blown_task = 0;
 
@@ -254,6 +256,9 @@ boolean Stack_check_Create_extension(
   Thread_Control *the_thread
 )
 {
+    if (!stack_check_initialized)
+      Stack_check_Initialize();
+
     if (the_thread /* XXX && (the_thread != _Thread_Executing) */ )
         stack_check_dope_stack(&the_thread->Start.Initial_stack);
 
@@ -271,6 +276,9 @@ void Stack_check_Begin_extension(
 {
   Stack_check_Control  *the_pattern;
 
+  if (!stack_check_initialized)
+    Stack_check_Initialize();
+
   if ( the_thread->Object.id == 0 )        /* skip system tasks */
     return;
 
diff --git a/cpukit/libmisc/stackchk/stackchk.h b/cpukit/libmisc/stackchk/stackchk.h
index b35251007d..1b40da5e0c 100644
--- a/cpukit/libmisc/stackchk/stackchk.h
+++ b/cpukit/libmisc/stackchk/stackchk.h
@@ -33,6 +33,48 @@ void Stack_check_Initialize( void );
 
 void Stack_check_Dump_usage( void );
 
+/*
+ *  Stack_check_Create_extension
+ */
+
+boolean Stack_check_Create_extension(
+  Thread_Control *running,
+  Thread_Control *the_thread
+);
+
+/*
+ *  Stack_check_Begin_extension
+ */
+
+void Stack_check_Begin_extension(
+  Thread_Control *the_thread
+);
+
+/*
+ *  Stack_check_Switch_extension
+ */
+
+void Stack_check_Switch_extension(
+  Thread_Control *running,
+  Thread_Control *heir
+);
+
+/*
+ *  Extension set definition
+ */
+
+#define STACK_CHECKER_EXTENSION \
+{ \
+  Stack_check_Create_extension,        /* rtems_task_create  */ \
+  0,                                   /* rtems_task_start   */ \
+  0,                                   /* rtems_task_restart */ \
+  0,                                   /* rtems_task_delete  */ \
+  Stack_check_Switch_extension,        /* task_switch  */ \
+  Stack_check_Begin_extension,         /* task_begin   */ \
+  0,                                   /* task_exitted */ \
+  0 /* Stack_check_Fatal_extension */, /* fatal        */ \
+}
+
 #ifdef __cplusplus
 }
 #endif
-- 
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