servers/vm/signal.c

   1
   2 #define _SYSTEM 1
   3
   4 #include <minix/callnr.h>
   5 #include <minix/com.h>
   6 #include <minix/config.h>
   7 #include <minix/const.h>
   8 #include <minix/ds.h>
   9 #include <minix/endpoint.h>
  10 #include <minix/keymap.h>
  11 #include <minix/minlib.h>
  12 #include <minix/type.h>
  13 #include <minix/ipc.h>
  14 #include <minix/sysutil.h>
  15 #include <minix/syslib.h>
  16 #include <minix/bitmap.h>
  17 #include <sys/sigcontext.h>
  18
  19 #include <errno.h>
  20 #include <env.h>
  21
  22 #include "glo.h"
  23 #include "vm.h"
  24 #include "proto.h"
  25 #include "util.h"
  26
  27 #define DATA_CHANGED       1    /* flag value when data segment size changed */
  28 #define STACK_CHANGED      2    /* flag value when stack size changed */
  29
  30 /*===========================================================================*
  31  *                              do_push_sig                                  *
  32  *===========================================================================*/
  33 PUBLIC int do_push_sig(message *msg)
  34 {
  35         int r, n;
  36         endpoint_t ep;
  37         vir_bytes sp;
  38         struct vmproc *vmp;
  39
  40         ep = msg->VMPS_ENDPOINT;
  41
  42         if((r=vm_isokendpt(ep, &n)) != OK) {
  43                 printf("VM: bogus endpoint %d from %d\n", ep, msg->m_source);
  44                 return r;
  45         }
  46         vmp = &vmproc[n];
  47
  48         if ((r=get_stack_ptr(ep, &sp)) != OK)
  49                 vm_panic("couldn't get new stack pointer (for sig)",r);
  50
  51         /* Save old SP for caller */
  52         msg->VMPS_OLD_SP = (char *) sp;
  53
  54         /* Make room for the sigcontext and sigframe struct. */
  55         sp -= sizeof(struct sigcontext)
  56                                  + 3 * sizeof(char *) + 2 * sizeof(int);
  57
  58         if ((r=adjust(vmp, vmp->vm_arch.vm_seg[D].mem_len, sp)) != OK) {
  59                 printf("VM: do_push_sig: adjust() failed: %d\n", r);
  60                 return r;
  61         }
  62
  63         return OK;
  64 }
  65