CVS: examples/stackcheck main.c,1.3,1.4

Update of /cvsroot/mspgcc/examples/stackcheck
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv30907/examples/stackcheck

Modified Files:
	main.c 
Log Message:
use pointer instead of asm variable

Index: main.c
===================================================================
RCS file: /cvsroot/mspgcc/examples/stackcheck/main.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -w -d -r1.3 -r1.4
--- main.c	15 Nov 2004 15:22:06 -0000	1.3
+++ main.c	23 Nov 2004 16:52:24 -0000	1.4
@@ -6,28 +6,12 @@
 #include "hardware.h"
 
 /** 
- * Address after the last used byte of the last segment in RAM (defined by
- * the linker)
- */
-extern void *__noinit_end;
-
-/** 
- * Access to the stack pointer.
- */
-register void * __stackptr asm("r1");
-
-/**
  * A constant that is unlikely to be a valid address/a value that occours
  * in the code
  */
-#define STACK_GUARD_INIT        0xcf55
+#define STACK_GUARD_INIT        0x0c55
 
-/** 
- * Place this variable after the end of the .no_init section, the last section
- * in the RAM. If the stack would grow too large, it wouldoverwrite this
- * variable.
- */
-extern short stackGuard asm("_end"); 
+extern unsigned short _end;  ///<Last used byte of the last segment in RAM (defined by the linker)
 
 /** 
  * Initilize the stack checking mechanisms.
@@ -36,14 +20,15 @@
  */
 inline void stackProtectionInit(void)
 {
-    unsigned short *address = &stackGuard;
+    unsigned short *address = &_end;
+    register void * __stackptr asm("r1");   ///<Access to the stack pointer
+    //init stack guard
+    (*address++) = STACK_GUARD_INIT;
     //fill free memory with a pattern for debug purpose (see max stack depth)
-    for (; address < (unsigned short *)__stackptr; address++)
+    while (address < (unsigned short *)__stackptr)
     {
-        *address = 0x5aa5;
+        *address++ = 0x7a7a;
     }
-    //init stack guard
-    stackGuard = STACK_GUARD_INIT;
 }
 
 /**
@@ -59,7 +44,8 @@
  */
 void stackCheck(void)
 {
-    if (stackGuard != STACK_GUARD_INIT)
+    unsigned short *address = &_end;
+    if ((*address) != STACK_GUARD_INIT)
     {
         //fatal error: the stack guard was altered -> stack overflow
         //~ log(LEVEL_FATAL, "Stack Overflow");



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