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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Copyright (c) 1987 by Sun Microsystems, Inc.
*/
/* Swap handler for SIGFPE codes. */
#include <errno.h>
#include <signal.h>
#include <floatingpoint.h>
#ifndef FPE_INTDIV_TRAP
#define FPE_INTDIV_TRAP 0x14 /* integer divide by zero */
#endif
#ifndef FPE_CHKINST_TRAP
#define FPE_CHKINST_TRAP 0x18 /* CHK [CHK2] instruction */
#endif
#ifndef FPE_TRAPV_TRAP
#define FPE_TRAPV_TRAP 0x1c /* TRAPV [cpTRAPcc TRAPcc] instr */
#endif
#ifndef FPE_FLTBSUN_TRAP
#define FPE_FLTBSUN_TRAP 0xc0 /* [branch or set on unordered cond] */
#endif
#ifndef FPE_FLTINEX_TRAP
#define FPE_FLTINEX_TRAP 0xc4 /* [floating inexact result] */
#endif
#ifndef FPE_FLTDIV_TRAP
#define FPE_FLTDIV_TRAP 0xc8 /* [floating divide by zero] */
#endif
#ifndef FPE_FLTUND_TRAP
#define FPE_FLTUND_TRAP 0xcc /* [floating underflow] */
#endif
#ifndef FPE_FLTOPERR_TRAP
#define FPE_FLTOPERR_TRAP 0xd0 /* [floating operand error] */
#endif
#ifndef FPE_FLTOVF_TRAP
#define FPE_FLTOVF_TRAP 0xd4 /* [floating overflow] */
#endif
#ifndef FPE_FLTNAN_TRAP
#define FPE_FLTNAN_TRAP 0xd8 /* [floating Not-A-Number] */
#endif
#ifndef FPE_FPA_ENABLE
#define FPE_FPA_ENABLE 0x400 /* [FPA not enabled] */
#endif
#ifndef FPE_FPA_ERROR
#define FPE_FPA_ERROR 0x404 /* [FPA arithmetic exception] */
#endif
#define N_SIGFPE_CODE 13
/* Array of SIGFPE codes. */
static sigfpe_code_type sigfpe_codes[N_SIGFPE_CODE] = {
FPE_INTDIV_TRAP,
FPE_CHKINST_TRAP,
FPE_TRAPV_TRAP,
FPE_FLTBSUN_TRAP,
FPE_FLTINEX_TRAP,
FPE_FLTDIV_TRAP,
FPE_FLTUND_TRAP,
FPE_FLTOPERR_TRAP,
FPE_FLTOVF_TRAP,
FPE_FLTNAN_TRAP,
FPE_FPA_ENABLE,
FPE_FPA_ERROR,
0};
/* Array of handlers. */
static sigfpe_handler_type sigfpe_handlers[N_SIGFPE_CODE];
static int _sigfpe_master_enabled;
/* Originally zero, set to 1 by _enable_sigfpe_master. */
void
_sigfpe_master(sig, code, scp, addr)
int sig;
sigfpe_code_type code;
struct sigcontext *scp;
char *addr;
{
int i;
enum fp_exception_type exception;
for (i = 0; (i < N_SIGFPE_CODE) && (code != sigfpe_codes[i]); i++);
/* Find index of handler. */
if (i >= N_SIGFPE_CODE)
i = N_SIGFPE_CODE - 1;
switch ((unsigned int)sigfpe_handlers[i]) {
case (unsigned int)SIGFPE_DEFAULT:
switch (code) {
case FPE_FLTBSUN_TRAP:
case FPE_FLTOPERR_TRAP:
case FPE_FLTNAN_TRAP:
exception = fp_invalid;
goto ieee;
case FPE_FLTINEX_TRAP:
exception = fp_inexact;
goto ieee;
case FPE_FLTDIV_TRAP:
exception = fp_division;
goto ieee;
case FPE_FLTUND_TRAP:
exception = fp_underflow;
goto ieee;
case FPE_FLTOVF_TRAP:
exception = fp_overflow;
goto ieee;
default: /* The common default treatment is to abort. */
break;
}
case (unsigned int)SIGFPE_ABORT:
abort();
case (unsigned int)SIGFPE_IGNORE:
return;
default: /* User-defined not SIGFPE_DEFAULT or
* SIGFPE_ABORT. */
(sigfpe_handlers[i]) (sig, code, scp, addr);
return;
}
ieee:
switch ((unsigned int)ieee_handlers[(int) exception]) {
case (unsigned int)SIGFPE_DEFAULT:
/* Error condition but ignore it. */
case (unsigned int)SIGFPE_IGNORE:
/* Error condition but ignore it. */
return;
case (unsigned int)SIGFPE_ABORT:
abort();
default:
(ieee_handlers[(int) exception]) (sig, code, scp, addr);
return;
}
}
int
_enable_sigfpe_master()
{
/* Enable the sigfpe master handler always. */
struct sigvec newsigvec, oldsigvec;
newsigvec.sv_handler = _sigfpe_master;
newsigvec.sv_mask = 0;
newsigvec.sv_onstack = 0;
_sigfpe_master_enabled = 1;
return sigvec(SIGFPE, &newsigvec, &oldsigvec);
}
int
_test_sigfpe_master()
{
/*
* Enable the sigfpe master handler if it's never been enabled
* before.
*/
if (_sigfpe_master_enabled == 0)
return _enable_sigfpe_master();
else
return _sigfpe_master_enabled;
}
sigfpe_handler_type
sigfpe(code, hdl)
sigfpe_code_type code;
sigfpe_handler_type hdl;
{
sigfpe_handler_type oldhdl;
int i;
_test_sigfpe_master();
for (i = 0; (i < N_SIGFPE_CODE) && (code != sigfpe_codes[i]); i++);
/* Find index of handler. */
if (i >= N_SIGFPE_CODE) {
errno = EINVAL;
return (sigfpe_handler_type) BADSIG;/* Not 0 or SIGFPE code */
}
oldhdl = sigfpe_handlers[i];
sigfpe_handlers[i] = hdl;
return oldhdl;
}
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