00001 /* Compute and print stack depth of program 00002 Copyright (C) 2001, 2002 Free Software Foundation, Inc. 00003 Written by Stephane Carrez (stcarrez@nerim.fr) 00004 00005 This file is free software; you can redistribute it and/or modify it 00006 under the terms of the GNU General Public License as published by the 00007 Free Software Foundation; either version 2, or (at your option) any 00008 later version. 00009 00010 In addition to the permissions in the GNU General Public License, the 00011 Free Software Foundation gives you unlimited permission to link the 00012 compiled version of this file with other programs, and to distribute 00013 those programs without any restriction coming from the use of this 00014 file. (The General Public License restrictions do apply in other 00015 respects; for example, they cover modification of the file, and 00016 distribution when not linked into another program.) 00017 00018 This file is distributed in the hope that it will be useful, but 00019 WITHOUT ANY WARRANTY; without even the implied warranty of 00020 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00021 General Public License for more details. 00022 00023 You should have received a copy of the GNU General Public License 00024 along with this program; see the file COPYING. If not, write to 00025 the Free Software Foundation, 59 Temple Place - Suite 330, 00026 Boston, MA 02111-1307, USA. */ 00027 00037 00038 #include <stdio.h> 00039 #include <stdarg.h> 00040 #include <sys/param.h> 00041 #include <sys/sio.h> 00042 #include <string.h> 00043 00044 char *stack_low = (char*) 0xffff; 00045 extern char _stack; 00046 00047 static void 00048 print_stack_size () 00049 { 00050 unsigned short sz; 00051 00052 sz = (unsigned short) (&_stack - stack_low); 00053 printf ("Stack size = %ld\n", (long) sz); 00054 } 00055 00056 static unsigned long 00057 fact (unsigned long n) 00058 { 00059 /* Buffer to use some stack space. */ 00060 char buf[10]; 00061 00062 memset (buf, 0, sizeof (buf)); 00063 if (n > 1) 00064 n = n * fact (n - 1); 00065 else 00066 n = 1; 00067 00068 return n; 00069 } 00070 00071 int 00072 main () 00073 { 00074 long i; 00075 unsigned long val; 00076 00077 serial_init (); 00078 for (i = 1; i < 10; i++) 00079 { 00080 val = fact (i); 00081 printf ("Fact %ld = %ld\t", i, val); 00082 print_stack_size (); 00083 stack_low = &_stack; 00084 } 00085 return 0; 00086 }