arch/um/kernel/user_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 <setjmp.h>
  11 #include <sys/mman.h>
  12 #include <sys/stat.h>
  13 #include <sys/utsname.h>
  14 #include <sys/param.h>
  15 #include <sys/time.h>
  16 #include "asm/types.h"
  17 #include <ctype.h>
  18 #include <signal.h>
  19 #include <wait.h>
  20 #include <errno.h>
  21 #include <stdarg.h>
  22 #include <sched.h>
  23 #include <termios.h>
  24 #include <string.h>
  25 #include "user_util.h"
  26 #include "kern_util.h"
  27 #include "user.h"
  28 #include "mem_user.h"
  29 #include "init.h"
  30 #include "helper.h"
  31 #include "ptrace_user.h"
  32 #include "uml-config.h"
  33
  34 void stop(void)
  35 {
  36         while(1) sleep(1000000);
  37 }
  38
  39 void stack_protections(unsigned long address)
  40 {
  41         int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  42
  43         if(mprotect((void *) address, page_size(), prot) < 0)
  44                 panic("protecting stack failed, errno = %d", errno);
  45 }
  46
  47 void task_protections(unsigned long address)
  48 {
  49         unsigned long guard = address + page_size();
  50         unsigned long stack = guard + page_size();
  51         int prot = 0, pages;
  52
  53 #ifdef notdef
  54         if(mprotect((void *) stack, page_size(), prot) < 0)
  55                 panic("protecting guard page failed, errno = %d", errno);
  56 #endif
  57         pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
  58         prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  59         if(mprotect((void *) stack, pages * page_size(), prot) < 0)
  60                 panic("protecting stack failed, errno = %d", errno);
  61 }
  62
  63 int wait_for_stop(int pid, int sig, int cont_type, void *relay)
  64 {
  65         sigset_t *relay_signals = relay;
  66         int status, ret;
  67
  68         while(1){
  69                 CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED));
  70                 if((ret < 0) ||
  71                    !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
  72                         if(ret < 0){
  73                                 printk("wait failed, errno = %d\n",
  74                                        errno);
  75                         }
  76                         else if(WIFEXITED(status))
  77                                 printk("process %d exited with status %d\n",
  78                                        pid, WEXITSTATUS(status));
  79                         else if(WIFSIGNALED(status))
  80                                 printk("process %d exited with signal %d\n",
  81                                        pid, WTERMSIG(status));
  82                         else if((WSTOPSIG(status) == SIGVTALRM) ||
  83                                 (WSTOPSIG(status) == SIGALRM) ||
  84                                 (WSTOPSIG(status) == SIGIO) ||
  85                                 (WSTOPSIG(status) == SIGPROF) ||
  86                                 (WSTOPSIG(status) == SIGCHLD) ||
  87                                 (WSTOPSIG(status) == SIGWINCH) ||
  88                                 (WSTOPSIG(status) == SIGINT)){
  89                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
  90                                 continue;
  91                         }
  92                         else if((relay_signals != NULL) &&
  93                                 sigismember(relay_signals, WSTOPSIG(status))){
  94                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
  95                                 continue;
  96                         }
  97                         else printk("process %d stopped with signal %d\n",
  98                                     pid, WSTOPSIG(status));
  99                         panic("wait_for_stop failed to wait for %d to stop "
 100                               "with %d\n", pid, sig);
 101                 }
 102                 return(status);
 103         }
 104 }
 105
 106 int raw(int fd)
 107 {
 108         struct termios tt;
 109         int err;
 110
 111         CATCH_EINTR(err = tcgetattr(fd, &tt));
 112         if (err < 0) {
 113                         printk("tcgetattr failed, errno = %d\n", errno);
 114                 return(-errno);
 115         }
 116
 117         cfmakeraw(&tt);
 118
 119         CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
 120         if (err < 0) {
 121                         printk("tcsetattr failed, errno = %d\n", errno);
 122                 return(-errno);
 123         }
 124
 125         /* XXX tcsetattr could have applied only some changes
 126          * (and cfmakeraw() is a set of changes) */
 127         return(0);
 128 }
 129
 130 void setup_machinename(char *machine_out)
 131 {
 132         struct utsname host;
 133
 134         uname(&host);
 135         strcpy(machine_out, host.machine);
 136 }
 137
 138 char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
 139
 140 void setup_hostinfo(void)
 141 {
 142         struct utsname host;
 143
 144         uname(&host);
 145         sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
 146                 host.release, host.version, host.machine);
 147 }
 148
 149 int setjmp_wrapper(void (*proc)(void *, void *), ...)
 150 {
 151         va_list args;
 152         sigjmp_buf buf;
 153         int n;
 154
 155         n = sigsetjmp(buf, 1);
 156         if(n == 0){
 157                 va_start(args, proc);
 158                 (*proc)(&buf, &args);
 159         }
 160         va_end(args);
 161         return(n);
 162 }
 163
 164 /*
 165  * Overrides for Emacs so that we follow Linus's tabbing style.
 166  * Emacs will notice this stuff at the end of the file and automatically
 167  * adjust the settings for this buffer only.  This must remain at the end
 168  * of the file.
 169  * ---------------------------------------------------------------------------
 170  * Local variables:
 171  * c-file-style: "linux"
 172  * End:
 173  */