Re: port-i386/43655 (integer division by zero delivers SIGFPE with wrong siginfo code on i386)

[christos%zoulas.com@localhost (Christos Zoulas)]

On Jul 23,  3:15pm, campbell+netbsd%mumble.net@localhost (Taylor R Campbell) 
wrote:
-- Subject: Re: port-i386/43655 (integer division by zero delivers SIGFPE wit

|  I'm cc'ing port-i386-maintainer because it looks like amd64 has the
|  same problem, from this snippet in amd64/amd64/trap.c:
|  
|                  case T_DIVIDE|T_USER:
|                          ksi.ksi_code = FPE_FLTDIV;
|  
|  T_DIVIDE is the code delivered by trap 0 in amd64/amd64/vector.S,
|  which is the trap for integer division by zero.  I think changing that
|  and the analogous line in i386/i386/trap.c to use FPE_INTDIV should
|  fix the problem, but I haven't tested to confirm this.  FPE_FLTDIV is
|  delivered for floating-point division by zero separately, in
|  i386/isa/npx.c for i386 and in amd64/amd64/fpu.c for amd64.
|  
|  Nearby in both trap.c files is FPE_FLTOVF for integer overflow (traps
|  4 and 5), and, in i386/i386/trap.c, FPE_INTOVF for FPU exceptions
|  (trap #x10, in what seems to be an unusual case, when NNPX = 0).  This
|  code needs to exchange some INTs and FLTs, methinks.

I am on it.

christos