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glibc  2.9
Functions
exc2signal.c File Reference
#include <hurd.h>
#include <hurd/signal.h>
#include <mach/exception.h>

Go to the source code of this file.

Functions

void _hurd_exception2signal (struct hurd_signal_detail *detail, int *signo)

Function Documentation

void _hurd_exception2signal ( struct hurd_signal_detail detail,
int signo 
)

Definition at line 28 of file exc2signal.c.

{
  detail->error = 0;

  switch (detail->exc)
    {
    default:
      *signo = SIGIOT;
      detail->code = detail->exc;
      break;

    case EXC_BAD_ACCESS:
      if (detail->exc_code == KERN_INVALID_ADDRESS
         || detail->exc_code == KERN_PROTECTION_FAILURE
         || detail->exc_code == KERN_WRITE_PROTECTION_FAILURE)
       *signo = SIGSEGV;
      else
       *signo = SIGBUS;
      detail->code = detail->exc_subcode;
      detail->error = detail->exc_code;
      break;

    case EXC_BAD_INSTRUCTION:
      *signo = SIGILL;
      if (detail->exc_code == EXC_I386_INVOP)
       detail->code = ILL_INVOPR_FAULT;
      else if (detail->exc_code == EXC_I386_STKFLT)
       detail->code = ILL_STACK_FAULT;
      else
       detail->code = 0;
      break;

    case EXC_ARITHMETIC:
      switch (detail->exc_code)
       {
       case EXC_I386_DIV:   /* integer divide by zero */
         *signo = SIGFPE;
         detail->code = FPE_INTDIV_FAULT;
         break;

       case EXC_I386_INTO:  /* integer overflow */
         *signo = SIGFPE;
         detail->code = FPE_INTOVF_TRAP;
         break;

         /* These aren't anywhere documented or used in Mach 3.0.  */
       case EXC_I386_NOEXT:
       case EXC_I386_EXTOVR:
       default:
         *signo = SIGFPE;
         detail->code = 0;
         break;

       case EXC_I386_EXTERR:
         /* Subcode is the fp_status word saved by the hardware.
            Give an error code corresponding to the first bit set.  */
         if (detail->exc_subcode & FPS_IE)
           {
             *signo = SIGILL;
             detail->code = ILL_FPEOPR_FAULT;
           }
         else if (detail->exc_subcode & FPS_DE)
           {
             *signo = SIGFPE;
             detail->code = FPE_FLTDNR_FAULT;
           }
         else if (detail->exc_subcode & FPS_ZE)
           {
             *signo = SIGFPE;
             detail->code = FPE_FLTDIV_FAULT;
           }
         else if (detail->exc_subcode & FPS_OE)
           {
             *signo = SIGFPE;
             detail->code = FPE_FLTOVF_FAULT;
           }
         else if (detail->exc_subcode & FPS_UE)
           {
             *signo = SIGFPE;
             detail->code = FPE_FLTUND_FAULT;
           }
         else if (detail->exc_subcode & FPS_PE)
           {
             *signo = SIGFPE;
             detail->code = FPE_FLTINX_FAULT;
           }
         else
           {
             *signo = SIGFPE;
             detail->code = 0;
           }
         break;

         /* These two can only be arithmetic exceptions if we
            are in V86 mode, which sounds like emulation to me.
            (See Mach 3.0 i386/trap.c.)  */
       case EXC_I386_EMERR:
         *signo = SIGFPE;
         detail->code = FPE_EMERR_FAULT;
         break;
       case EXC_I386_BOUND:
         *signo = SIGFPE;
         detail->code = FPE_EMBND_FAULT;
         break;
       }
      break;

    case EXC_EMULATION:
      /* 3.0 doesn't give this one, why, I don't know.  */
      *signo = SIGEMT;
      detail->code = 0;
      break;

    case EXC_SOFTWARE:
      /* The only time we get this in Mach 3.0
        is for an out of bounds trap.  */
      if (detail->exc_code == EXC_I386_BOUND)
       {
         *signo = SIGFPE;
         detail->code = FPE_SUBRNG_FAULT;
       }
      else
       {
         *signo = SIGEMT;
         detail->code = 0;
       }
      break;

    case EXC_BREAKPOINT:
      *signo = SIGTRAP;
      if (detail->exc_code == EXC_I386_SGL)
       detail->code = DBG_SINGLE_TRAP;
      else if (detail->exc_code == EXC_I386_BPT)
       detail->code = DBG_BRKPNT_FAULT;
      else
       detail->code = 0;
      break;
    }
}