arch/um/os-Linux/util.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <limits.h>
  10 #include <sys/mman.h>
  11 #include <sys/stat.h>
  12 #include <sys/utsname.h>
  13 #include <sys/param.h>
  14 #include <sys/time.h>
  15 #include "asm/types.h"
  16 #include <ctype.h>
  17 #include <signal.h>
  18 #include <wait.h>
  19 #include <errno.h>
  20 #include <stdarg.h>
  21 #include <sched.h>
  22 #include <termios.h>
  23 #include <string.h>
  24 #include "kern_util.h"
  25 #include "user.h"
  26 #include "mem_user.h"
  27 #include "init.h"
  28 #include "ptrace_user.h"
  29 #include "uml-config.h"
  30 #include "os.h"
  31 #include "longjmp.h"
  32 #include "kern_constants.h"
  33
  34 void stack_protections(unsigned long address)
  35 {
  36         int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  37
  38         if(mprotect((void *) address, UM_KERN_PAGE_SIZE, prot) < 0)
  39                 panic("protecting stack failed, errno = %d", errno);
  40 }
  41
  42 void task_protections(unsigned long address)
  43 {
  44         unsigned long guard = address + UM_KERN_PAGE_SIZE;
  45         unsigned long stack = guard + UM_KERN_PAGE_SIZE;
  46         int prot = 0, pages;
  47
  48 #ifdef notdef
  49         if(mprotect((void *) stack, UM_KERN_PAGE_SIZE, prot) < 0)
  50                 panic("protecting guard page failed, errno = %d", errno);
  51 #endif
  52         pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
  53         prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  54         if(mprotect((void *) stack, pages * UM_KERN_PAGE_SIZE, prot) < 0)
  55                 panic("protecting stack failed, errno = %d", errno);
  56 }
  57
  58 int raw(int fd)
  59 {
  60         struct termios tt;
  61         int err;
  62
  63         CATCH_EINTR(err = tcgetattr(fd, &tt));
  64         if(err < 0)
  65                 return -errno;
  66
  67         cfmakeraw(&tt);
  68
  69         CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
  70         if(err < 0)
  71                 return -errno;
  72
  73         /* XXX tcsetattr could have applied only some changes
  74          * (and cfmakeraw() is a set of changes) */
  75         return(0);
  76 }
  77
  78 void setup_machinename(char *machine_out)
  79 {
  80         struct utsname host;
  81
  82         uname(&host);
  83 #ifdef UML_CONFIG_UML_X86
  84 # ifndef UML_CONFIG_64BIT
  85         if (!strcmp(host.machine, "x86_64")) {
  86                 strcpy(machine_out, "i686");
  87                 return;
  88         }
  89 # else
  90         if (!strcmp(host.machine, "i686")) {
  91                 strcpy(machine_out, "x86_64");
  92                 return;
  93         }
  94 # endif
  95 #endif
  96         strcpy(machine_out, host.machine);
  97 }
  98
  99 void setup_hostinfo(char *buf, int len)
 100 {
 101         struct utsname host;
 102
 103         uname(&host);
 104         snprintf(buf, len, "%s %s %s %s %s", host.sysname, host.nodename,
 105                  host.release, host.version, host.machine);
 106 }
 107
 108 int setjmp_wrapper(void (*proc)(void *, void *), ...)
 109 {
 110         va_list args;
 111         jmp_buf buf;
 112         int n;
 113
 114         n = UML_SETJMP(&buf);
 115         if(n == 0){
 116                 va_start(args, proc);
 117                 (*proc)(&buf, &args);
 118         }
 119         va_end(args);
 120         return n;
 121 }