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 "ptrace_user.h"
  31 #include "uml-config.h"
  32
  33 void stop(void)
  34 {
  35         while(1) sleep(1000000);
  36 }
  37
  38 void stack_protections(unsigned long address)
  39 {
  40         int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  41
  42         if(mprotect((void *) address, page_size(), prot) < 0)
  43                 panic("protecting stack failed, errno = %d", errno);
  44 }
  45
  46 void task_protections(unsigned long address)
  47 {
  48         unsigned long guard = address + page_size();
  49         unsigned long stack = guard + page_size();
  50         int prot = 0, pages;
  51
  52 #ifdef notdef
  53         if(mprotect((void *) stack, page_size(), prot) < 0)
  54                 panic("protecting guard page failed, errno = %d", errno);
  55 #endif
  56         pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
  57         prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  58         if(mprotect((void *) stack, pages * page_size(), prot) < 0)
  59                 panic("protecting stack failed, errno = %d", errno);
  60 }
  61
  62 int wait_for_stop(int pid, int sig, int cont_type, void *relay)
  63 {
  64         sigset_t *relay_signals = relay;
  65         int status, ret;
  66
  67         while(1){
  68                 CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED));
  69                 if((ret < 0) ||
  70                    !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
  71                         if(ret < 0){
  72                                 printk("wait failed, errno = %d\n",
  73                                        errno);
  74                         }
  75                         else if(WIFEXITED(status))
  76                                 printk("process %d exited with status %d\n",
  77                                        pid, WEXITSTATUS(status));
  78                         else if(WIFSIGNALED(status))
  79                                 printk("process %d exited with signal %d\n",
  80                                        pid, WTERMSIG(status));
  81                         else if((WSTOPSIG(status) == SIGVTALRM) ||
  82                                 (WSTOPSIG(status) == SIGALRM) ||
  83                                 (WSTOPSIG(status) == SIGIO) ||
  84                                 (WSTOPSIG(status) == SIGPROF) ||
  85                                 (WSTOPSIG(status) == SIGCHLD) ||
  86                                 (WSTOPSIG(status) == SIGWINCH) ||
  87                                 (WSTOPSIG(status) == SIGINT)){
  88                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
  89                                 continue;
  90                         }
  91                         else if((relay_signals != NULL) &&
  92                                 sigismember(relay_signals, WSTOPSIG(status))){
  93                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
  94                                 continue;
  95                         }
  96                         else printk("process %d stopped with signal %d\n",
  97                                     pid, WSTOPSIG(status));
  98                         panic("wait_for_stop failed to wait for %d to stop "
  99                               "with %d\n", pid, sig);
 100                 }
 101                 return(status);
 102         }
 103 }
 104
 105 int raw(int fd)
 106 {
 107         struct termios tt;
 108         int err;
 109
 110         CATCH_EINTR(err = tcgetattr(fd, &tt));
 111         if(err < 0)
 112                 return -errno;
 113
 114         cfmakeraw(&tt);
 115
 116         CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
 117         if(err < 0)
 118                 return -errno;
 119
 120         /* XXX tcsetattr could have applied only some changes
 121          * (and cfmakeraw() is a set of changes) */
 122         return(0);
 123 }
 124
 125 void setup_machinename(char *machine_out)
 126 {
 127         struct utsname host;
 128
 129         uname(&host);
 130 #if defined(UML_CONFIG_UML_X86) && !defined(UML_CONFIG_64BIT)
 131         if (!strcmp(host.machine, "x86_64")) {
 132                 strcpy(machine_out, "i686");
 133                 return;
 134         }
 135 #endif
 136         strcpy(machine_out, host.machine);
 137 }
 138
 139 char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
 140
 141 void setup_hostinfo(void)
 142 {
 143         struct utsname host;
 144
 145         uname(&host);
 146         sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
 147                 host.release, host.version, host.machine);
 148 }
 149
 150 int setjmp_wrapper(void (*proc)(void *, void *), ...)
 151 {
 152         va_list args;
 153         sigjmp_buf buf;
 154         int n;
 155
 156         n = sigsetjmp(buf, 1);
 157         if(n == 0){
 158                 va_start(args, proc);
 159                 (*proc)(&buf, &args);
 160         }
 161         va_end(args);
 162         return(n);
 163 }
 164
 165 /*
 166  * Overrides for Emacs so that we follow Linus's tabbing style.
 167  * Emacs will notice this stuff at the end of the file and automatically
 168  * adjust the settings for this buffer only.  This must remain at the end
 169  * of the file.
 170  * ---------------------------------------------------------------------------
 171  * Local variables:
 172  * c-file-style: "linux"
 173  * End:
 174  */