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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <sys/atomic.h>
#include <sys/kmem.h>
#include <sys/machpcb.h>
#include <sys/utrap.h>
#include <sys/model.h>
int
install_utrap(utrap_entry_t type, utrap_handler_t new_handler,
utrap_handler_t *old_handlerp)
{
struct proc *p = curthread->t_procp;
utrap_handler_t *ov, *nv, *pv, *sv, *tmp;
caddr32_t nv32;
int idx;
/*
* Check trap number.
*/
switch (type) {
case UTRAP_V8P_FP_DISABLED:
#ifdef SF_ERRATA_30 /* call causes fp-disabled */
{
extern int spitfire_call_bug;
if (spitfire_call_bug)
return ((int)set_errno(ENOSYS));
}
#endif /* SF_ERRATA_30 */
idx = UTRAP_V8P_FP_DISABLED;
break;
case UTRAP_V8P_MEM_ADDRESS_NOT_ALIGNED:
idx = UTRAP_V8P_MEM_ADDRESS_NOT_ALIGNED;
break;
default:
return ((int)set_errno(EINVAL));
}
if (get_udatamodel() == DATAMODEL_LP64)
return ((int)set_errno(EINVAL));
/*
* Be sure handler address is word aligned. The uintptr_t casts are
* there to prevent warnings when using a certain compiler, and the
* temporary 32 bit variable is intended to ensure proper code
* generation and avoid a messy quadruple cast.
*/
nv32 = (caddr32_t)(uintptr_t)new_handler;
nv = (utrap_handler_t *)(uintptr_t)nv32;
if (nv != UTRAP_UTH_NOCHANGE) {
if (((uintptr_t)nv) & 0x3)
return ((int)set_errno(EINVAL));
}
/*
* Allocate proc space for saving the addresses to these user
* trap handlers, which must later be freed. Use atomic_cas_ptr to
* do this atomically.
*/
if (p->p_utraps == NULL) {
pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) *
sizeof (utrap_handler_t *), KM_SLEEP);
tmp = atomic_cas_ptr(&p->p_utraps, NULL, sv);
if (tmp != NULL) {
kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) *
sizeof (utrap_handler_t *));
}
}
ASSERT(p->p_utraps != NULL);
/*
* Use atomic_cas_ptr to atomically install the handler.
*/
ov = p->p_utraps[idx];
if (new_handler != (utrap_handler_t)UTRAP_UTH_NOCHANGE) {
for (;;) {
tmp = atomic_cas_ptr(&p->p_utraps[idx], ov, nv);
if (ov == tmp)
break;
ov = tmp;
}
}
if (old_handlerp != NULL) {
if (suword32(old_handlerp, (uint32_t)(uintptr_t)ov) == -1)
return ((int)set_errno(EINVAL));
}
return (0);
}
void
utrap_dup(struct proc *pp, struct proc *cp)
{
if (pp->p_utraps != NULL) {
cp->p_utraps = kmem_alloc((UT_PRECISE_MAXTRAPS+1) *
sizeof (utrap_handler_t *), KM_SLEEP);
bcopy(pp->p_utraps, cp->p_utraps,
(UT_PRECISE_MAXTRAPS+1) * sizeof (utrap_handler_t *));
} else {
cp->p_utraps = NULL;
}
}
void
utrap_free(struct proc *p)
{
/* Free any kmem_alloc'ed space for user trap handlers. */
if (p->p_utraps != NULL) {
kmem_free(p->p_utraps, (UT_PRECISE_MAXTRAPS+1) *
sizeof (utrap_handler_t *));
p->p_utraps = NULL;
}
}
/*
* The code below supports the set of user traps which are required and
* "must be provided by all ABI-conforming implementations", according to
* 3.3.3 User Traps of the SPARC V9 ABI SUPPLEMENT, Delta Document 1.38.
* There is only 1 deferred trap in Ultra I&II, the asynchronous error
* traps, which are not required, so the deferred args are not used.
*/
/*ARGSUSED*/
int
sparc_utrap_install(utrap_entry_t type,
utrap_handler_t new_precise, utrap_handler_t new_deferred,
utrap_handler_t *old_precise, utrap_handler_t *old_deferred)
{
struct proc *p = curthread->t_procp;
utrap_handler_t *ov, *nvp, *pv, *sv, *tmp;
int idx;
/*
* Check trap number.
*/
switch (type) {
case UT_ILLTRAP_INSTRUCTION:
idx = UT_ILLTRAP_INSTRUCTION;
break;
case UT_FP_DISABLED:
#ifdef SF_ERRATA_30 /* call causes fp-disabled */
{
extern int spitfire_call_bug;
if (spitfire_call_bug)
return ((int)set_errno(ENOSYS));
}
#endif /* SF_ERRATA_30 */
idx = UT_FP_DISABLED;
break;
case UT_FP_EXCEPTION_IEEE_754:
idx = UT_FP_EXCEPTION_IEEE_754;
break;
case UT_TAG_OVERFLOW:
idx = UT_TAG_OVERFLOW;
break;
case UT_DIVISION_BY_ZERO:
idx = UT_DIVISION_BY_ZERO;
break;
case UT_MEM_ADDRESS_NOT_ALIGNED:
idx = UT_MEM_ADDRESS_NOT_ALIGNED;
break;
case UT_PRIVILEGED_ACTION:
idx = UT_PRIVILEGED_ACTION;
break;
case UT_TRAP_INSTRUCTION_16:
case UT_TRAP_INSTRUCTION_17:
case UT_TRAP_INSTRUCTION_18:
case UT_TRAP_INSTRUCTION_19:
case UT_TRAP_INSTRUCTION_20:
case UT_TRAP_INSTRUCTION_21:
case UT_TRAP_INSTRUCTION_22:
case UT_TRAP_INSTRUCTION_23:
case UT_TRAP_INSTRUCTION_24:
case UT_TRAP_INSTRUCTION_25:
case UT_TRAP_INSTRUCTION_26:
case UT_TRAP_INSTRUCTION_27:
case UT_TRAP_INSTRUCTION_28:
case UT_TRAP_INSTRUCTION_29:
case UT_TRAP_INSTRUCTION_30:
case UT_TRAP_INSTRUCTION_31:
idx = type;
break;
default:
return ((int)set_errno(EINVAL));
}
if (get_udatamodel() == DATAMODEL_ILP32)
return ((int)set_errno(EINVAL));
/*
* Be sure handler address is word aligned.
* There are no deferred traps, so ignore them.
*/
nvp = (utrap_handler_t *)new_precise;
if (nvp != UTRAP_UTH_NOCHANGE) {
if (((uintptr_t)nvp) & 0x3)
return ((int)set_errno(EINVAL));
}
/*
* Allocate proc space for saving the addresses to these user
* trap handlers, which must later be freed. Use atomic_cas_ptr to
* do this atomically.
*/
if (p->p_utraps == NULL) {
pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) *
sizeof (utrap_handler_t *), KM_SLEEP);
tmp = atomic_cas_ptr(&p->p_utraps, NULL, sv);
if (tmp != NULL) {
kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) *
sizeof (utrap_handler_t *));
}
}
ASSERT(p->p_utraps != NULL);
/*
* Use atomic_cas_ptr to atomically install the handlers.
*/
ov = p->p_utraps[idx];
if (new_precise != (utrap_handler_t)UTH_NOCHANGE) {
for (;;) {
tmp = atomic_cas_ptr(&p->p_utraps[idx], ov, nvp);
if (ov == tmp)
break;
ov = tmp;
}
}
if (old_precise != NULL) {
if (suword64(old_precise, (uint64_t)ov) == -1)
return ((int)set_errno(EINVAL));
}
return (0);
}
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