linux_emul_base/trap.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <ureg.h>
   4 #include "dat.h"
   5 #include "fns.h"
   6 #include "linux.h"
   7
   8 #pragma profile off
   9
  10 void
  11 retuser(void)
  12 {
  13         Uproc *p;
  14         Ureg *u;
  15
  16         p = current;
  17         u = p->ureg;
  18         p->ureg = nil;
  19         if(p->innote == 0)
  20                 jumpureg(u);
  21         p->innote = 0;
  22         noted(NCONT);
  23 }
  24
  25 static void
  26 handletrap(void *v, char *m)
  27 {
  28         Uproc *p;
  29         Usiginfo si;
  30
  31         p = current;
  32         p->innote = 1;
  33         p->ureg = v;
  34
  35         if(strncmp(m, "interrupt", 9) == 0){
  36                 if(p->notified){
  37                         p->notified = 0;
  38                 } else {
  39                         memset(&si, 0, sizeof(si));
  40                         si.signo = SIGINT;
  41                         sendsignal(p, &si, 0);
  42                 }
  43                 goto handled;
  44         }
  45
  46         if(p->traceproc)
  47                 goto traced;
  48
  49         if(strncmp(m, "sys: trap: general protection violation", 39) == 0)
  50                 if(linuxcall() == 0)
  51                         goto handled;
  52
  53         if(strncmp(m, "sys: write on closed pipe", 25) == 0)
  54                 goto handled;
  55
  56         if(strncmp(m, "sys: trap: invalid opcode", 25) == 0){
  57                 memset(&si, 0, sizeof(si));
  58                 si.signo = SIGILL;
  59                 si.code = ILL_ILLOPC;
  60                 si.fault.addr = (void*)p->ureg->pc;
  61                 sendsignal(p, &si, 0);
  62                 goto handled;
  63         }
  64
  65         if(strncmp(m, "sys: trap: divide error", 23) == 0){
  66                 memset(&si, 0, sizeof(si));
  67                 si.signo = SIGFPE;
  68                 si.code = FPE_INTDIV;
  69                 si.fault.addr = (void*)p->ureg->pc;
  70                 sendsignal(p, &si, 0);
  71                 goto handled;
  72         }
  73
  74         if(strncmp(m, "sys: trap: overflow", 19) == 0){
  75                 memset(&si, 0, sizeof(si));
  76                 si.signo = SIGFPE;
  77                 si.code = FPE_INTOVF;
  78                 si.fault.addr = (void*)p->ureg->pc;
  79                 sendsignal(p, &si, 0);
  80                 goto handled;
  81         }
  82
  83         trace("handletrap: %s", m);
  84         if(debug)
  85                 noted(NDFLT);
  86
  87         exitproc(p, SIGKILL, 1);
  88
  89 handled:
  90         if(p->traceproc)
  91 traced: p->traceproc(p->tracearg);
  92
  93         handlesignals();
  94         retuser();
  95 }
  96
  97 #pragma profile on
  98
  99
 100 void inittrap(void)
 101 {
 102         ulong f;
 103
 104         /* disable FPU faults */
 105         f = getfcr();
 106         f &= ~(FPINEX|FPOVFL|FPUNFL|FPZDIV|FPINVAL);
 107         setfcr(f);
 108
 109         notify(handletrap);
 110 }