The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2005 David Decotigny
002 
003    This program is free software; you can redistribute it and/or
004    modify it under the terms of the GNU General Public License
005    as published by the Free Software Foundation; either version 2
006    of the License, or (at your option) any later version.
007    
008    This program is distributed in the hope that it will be useful,
009    but WITHOUT ANY WARRANTY; without even the implied warranty of
010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
011    GNU General Public License for more details.
012    
013    You should have received a copy of the GNU General Public License
014    along with this program; if not, write to the Free Software
015    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
016    USA. 
017 */
018 
019 #include <crt.h>
020 #include <libc.h>
021 #include <stdarg.h>
022 #include <debug.h>
023 
024 /**
025  * @file myprog10.c
026  *
027  * mprotect tests
028  *
029  * We use the temporary syscall 4004 to dump the list of VRs in the
030  * thread's address space
031  */
032 
033 int main()
034 {
035   char * zoup;
036 
037   zoup = mmap((void*)4096, 8*1024*1024,
038               PROT_READ | PROT_WRITE,
039               MAP_SHARED,
040               "/dev/zero", 34);
041   bochs_printf("mapped @%x\n", (unsigned)zoup);
042 
043   /* Do some forks to complicate things */
044   fork();
045   fork();
046 
047   _sos_syscall1(4004, (unsigned)"Initial");
048   mprotect(zoup, 10*4096, PROT_READ);
049   zoup += 10*4096;
050   _sos_syscall1(4004, (unsigned)"After mprotect Low");
051 
052   mprotect(zoup-4096, 2*4096, PROT_READ);
053   zoup += 4096;
054   _sos_syscall1(4004, (unsigned)"After mprotect Before Low");
055 
056   mprotect(zoup-4096, 4096, PROT_READ);
057   _sos_syscall1(4004, (unsigned)"After mprotect Before low (bis)");
058 
059   mprotect(zoup + 1024*1024, 4096, PROT_READ);
060   _sos_syscall1(4004, (unsigned)"After mprotect Middle");
061 
062   mprotect(zoup + 1024*1024, 4096, PROT_READ);
063   _sos_syscall1(4004, (unsigned)"After mprotect Middle (bis)");
064 
065   mprotect(zoup + 8*1024*1024 - 11*4096 - 4096, 4096, PROT_READ);
066   _sos_syscall1(4004, (unsigned)"After mprotect High");
067 
068   mprotect(zoup + 8*1024*1024 - 11*4096 - 2*4096, 3*4096, PROT_READ);
069   _sos_syscall1(4004, (unsigned)"After mprotect Past High");
070 
071   mprotect((void*)0x40000000, 0x10000000, PROT_READ);
072   _sos_syscall1(4004, (unsigned)"After mprotect Complete VR");
073 
074   mprotect((void*)0x40000000, 0x10000000, PROT_READ);
075   _sos_syscall1(4004, (unsigned)"After mprotect Complete VR (bis)");
076 
077   return 0;
078 }

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