kernel/system/do_abort.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_ABORT
   3  *
   4  * The parameters for this kernel call are:
   5  *    m1_i1:    ABRT_HOW        (how to abort, possibly fetch monitor params)
   6  *    m1_i2:    ABRT_MON_PROC   (proc nr to get monitor params from)
   7  *    m1_i3:    ABRT_MON_LEN    (length of monitor params)
   8  *    m1_p1:    ABRT_MON_ADDR   (virtual address of params)
   9  */
  10
  11 #include "../system.h"
  12 #include <unistd.h>
  13
  14 #if USE_ABORT
  15
  16 /*===========================================================================*
  17  *                              do_abort                                     *
  18  *===========================================================================*/
  19 PUBLIC int do_abort(m_ptr)
  20 message *m_ptr;                 /* pointer to request message */
  21 {
  22 /* Handle sys_abort. MINIX is unable to continue. This can originate e.g.
  23  * in the PM (normal abort or panic) or TTY (after CTRL-ALT-DEL).
  24  */
  25   int how = m_ptr->ABRT_HOW;
  26   int proc_nr;
  27   int length;
  28   phys_bytes src_phys;
  29
  30   /* See if the monitor is to run the specified instructions. */
  31   if (how == RBT_MONITOR) {
  32
  33       if(!isokendpt(m_ptr->ABRT_MON_ENDPT, &proc_nr)) return(EDEADSRCDST);
  34       length = m_ptr->ABRT_MON_LEN + 1;
  35       if (length > kinfo.params_size) return(E2BIG);
  36       src_phys = numap_local(proc_nr,(vir_bytes)m_ptr->ABRT_MON_ADDR,length);
  37       if (! src_phys) return(EFAULT);
  38
  39       /* Parameters seem ok, copy them and prepare shutting down. */
  40       phys_copy(src_phys, kinfo.params_base, (phys_bytes) length);
  41   }
  42
  43   /* Now prepare to shutdown MINIX. */
  44   prepare_shutdown(how);
  45   return(OK);                           /* pro-forma (really EDISASTER) */
  46 }
  47
  48 #endif /* USE_ABORT */
  49