1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/errno.h> 31 #include <sys/systm.h> 32 #include <sys/atomic.h> 33 #include <sys/kmem.h> 34 #include <sys/machpcb.h> 35 #include <sys/utrap.h> 36 #include <sys/model.h> 37 #include <sys/cmn_err.h> 38 39 int 40 install_utrap(utrap_entry_t type, utrap_handler_t new_handler, 41 utrap_handler_t *old_handlerp) 42 { 43 struct proc *p = curthread->t_procp; 44 utrap_handler_t *ov, *nv, *pv, *sv, *tmp; 45 int idx; 46 47 /* 48 * Check trap number. 49 */ 50 switch (type) { 51 case UTRAP_V8P_FP_DISABLED: 52 #ifdef SF_ERRATA_30 /* call causes fp-disabled */ 53 { 54 extern int spitfire_call_bug; 55 56 if (spitfire_call_bug) { 57 cmn_err(CE_WARN, "UTRAP_V8P_FP_DISABLED " 58 "not supported for cpu version < 2.2"); 59 return ((int)set_errno(ENOSYS)); 60 } 61 } 62 #endif /* SF_ERRATA_30 */ 63 idx = UTRAP_V8P_FP_DISABLED; 64 break; 65 case UTRAP_V8P_MEM_ADDRESS_NOT_ALIGNED: 66 idx = UTRAP_V8P_MEM_ADDRESS_NOT_ALIGNED; 67 break; 68 default: 69 return ((int)set_errno(EINVAL)); 70 } 71 if (get_udatamodel() == DATAMODEL_LP64) { 72 cmn_err(CE_WARN, "install_utrap private interface " 73 "not supported for LP64 user programs"); 74 return ((int)set_errno(EINVAL)); 75 } 76 77 /* 78 * Be sure handler address is word aligned. 79 */ 80 nv = (utrap_handler_t *)(caddr32_t)new_handler; 81 if (nv != UTRAP_UTH_NOCHANGE) { 82 if (((uintptr_t)nv) & 0x3) 83 return ((int)set_errno(EINVAL)); 84 } 85 /* 86 * Allocate proc space for saving the addresses to these user 87 * trap handlers, which must later be freed. Use casptr to 88 * do this atomically. 89 */ 90 if (p->p_utraps == NULL) { 91 pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) * 92 sizeof (utrap_handler_t *), KM_SLEEP); 93 tmp = casptr(&p->p_utraps, NULL, sv); 94 if (tmp != NULL) { 95 kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) * 96 sizeof (utrap_handler_t *)); 97 } 98 } 99 ASSERT(p->p_utraps != NULL); 100 101 /* 102 * Use casptr to atomically install the handler. 103 */ 104 ov = p->p_utraps[idx]; 105 if (new_handler != (utrap_handler_t)UTRAP_UTH_NOCHANGE) { 106 for (;;) { 107 tmp = casptr(&p->p_utraps[idx], ov, nv); 108 if (ov == tmp) 109 break; 110 ov = tmp; 111 } 112 } 113 if (old_handlerp != NULL) { 114 if (suword32(old_handlerp, (uint32_t)ov) == -1) 115 return ((int)set_errno(EINVAL)); 116 } 117 return (0); 118 } 119 120 void 121 utrap_dup(struct proc *pp, struct proc *cp) 122 { 123 if (pp->p_utraps != NULL) { 124 cp->p_utraps = kmem_alloc((UT_PRECISE_MAXTRAPS+1) * 125 sizeof (utrap_handler_t *), KM_SLEEP); 126 bcopy(pp->p_utraps, cp->p_utraps, 127 (UT_PRECISE_MAXTRAPS+1) * sizeof (utrap_handler_t *)); 128 } else { 129 cp->p_utraps = NULL; 130 } 131 } 132 133 void 134 utrap_free(struct proc *p) 135 { 136 /* Free any kmem_alloc'ed space for user trap handlers. */ 137 if (p->p_utraps != NULL) { 138 kmem_free(p->p_utraps, (UT_PRECISE_MAXTRAPS+1) * 139 sizeof (utrap_handler_t *)); 140 p->p_utraps = NULL; 141 } 142 } 143 144 /* 145 * The code below supports the set of user traps which are required and 146 * "must be provided by all ABI-conforming implementations", according to 147 * 3.3.3 User Traps of the SPARC V9 ABI SUPPLEMENT, Delta Document 1.38. 148 * There is only 1 deferred trap in Ultra I&II, the asynchronous error 149 * traps, which are not required, so the deferred args are not used. 150 */ 151 /*ARGSUSED*/ 152 int 153 sparc_utrap_install(utrap_entry_t type, 154 utrap_handler_t new_precise, utrap_handler_t new_deferred, 155 utrap_handler_t *old_precise, utrap_handler_t *old_deferred) 156 { 157 struct proc *p = curthread->t_procp; 158 utrap_handler_t *ov, *nvp, *pv, *sv, *tmp; 159 int idx; 160 161 /* 162 * Check trap number. 163 */ 164 switch (type) { 165 case UT_ILLTRAP_INSTRUCTION: 166 idx = UT_ILLTRAP_INSTRUCTION; 167 break; 168 case UT_FP_DISABLED: 169 #ifdef SF_ERRATA_30 /* call causes fp-disabled */ 170 { 171 extern int spitfire_call_bug; 172 173 if (spitfire_call_bug) { 174 cmn_err(CE_WARN, "UT_FP_DISABLED " 175 "not supported for cpu version < 2.2"); 176 return ((int)set_errno(ENOSYS)); 177 } 178 } 179 #endif /* SF_ERRATA_30 */ 180 idx = UT_FP_DISABLED; 181 break; 182 case UT_FP_EXCEPTION_IEEE_754: 183 idx = UT_FP_EXCEPTION_IEEE_754; 184 break; 185 case UT_TAG_OVERFLOW: 186 idx = UT_TAG_OVERFLOW; 187 break; 188 case UT_DIVISION_BY_ZERO: 189 idx = UT_DIVISION_BY_ZERO; 190 break; 191 case UT_MEM_ADDRESS_NOT_ALIGNED: 192 idx = UT_MEM_ADDRESS_NOT_ALIGNED; 193 break; 194 case UT_PRIVILEGED_ACTION: 195 idx = UT_PRIVILEGED_ACTION; 196 break; 197 case UT_TRAP_INSTRUCTION_16: 198 case UT_TRAP_INSTRUCTION_17: 199 case UT_TRAP_INSTRUCTION_18: 200 case UT_TRAP_INSTRUCTION_19: 201 case UT_TRAP_INSTRUCTION_20: 202 case UT_TRAP_INSTRUCTION_21: 203 case UT_TRAP_INSTRUCTION_22: 204 case UT_TRAP_INSTRUCTION_23: 205 case UT_TRAP_INSTRUCTION_24: 206 case UT_TRAP_INSTRUCTION_25: 207 case UT_TRAP_INSTRUCTION_26: 208 case UT_TRAP_INSTRUCTION_27: 209 case UT_TRAP_INSTRUCTION_28: 210 case UT_TRAP_INSTRUCTION_29: 211 case UT_TRAP_INSTRUCTION_30: 212 case UT_TRAP_INSTRUCTION_31: 213 idx = type; 214 break; 215 default: 216 return ((int)set_errno(EINVAL)); 217 } 218 219 if (get_udatamodel() == DATAMODEL_ILP32) { 220 cmn_err(CE_WARN, "__sparc_utrap_install interface " 221 "not supported for ILP32 user programs"); 222 return ((int)set_errno(EINVAL)); 223 } 224 225 /* 226 * Be sure handler address is word aligned. 227 * There are no deferred traps, so ignore them. 228 */ 229 nvp = (utrap_handler_t *)new_precise; 230 if (nvp != UTRAP_UTH_NOCHANGE) { 231 if (((uintptr_t)nvp) & 0x3) 232 return ((int)set_errno(EINVAL)); 233 } 234 235 /* 236 * Allocate proc space for saving the addresses to these user 237 * trap handlers, which must later be freed. Use casptr to 238 * do this atomically. 239 */ 240 if (p->p_utraps == NULL) { 241 pv = sv = kmem_zalloc((UT_PRECISE_MAXTRAPS+1) * 242 sizeof (utrap_handler_t *), KM_SLEEP); 243 tmp = casptr(&p->p_utraps, NULL, sv); 244 if (tmp != NULL) { 245 kmem_free(pv, (UT_PRECISE_MAXTRAPS+1) * 246 sizeof (utrap_handler_t *)); 247 } 248 } 249 ASSERT(p->p_utraps != NULL); 250 251 /* 252 * Use casptr to atomically install the handlers. 253 */ 254 ov = p->p_utraps[idx]; 255 if (new_precise != (utrap_handler_t)UTH_NOCHANGE) { 256 for (;;) { 257 tmp = casptr(&p->p_utraps[idx], ov, nvp); 258 if (ov == tmp) 259 break; 260 ov = tmp; 261 } 262 } 263 if (old_precise != NULL) { 264 if (suword64(old_precise, (uint64_t)ov) == -1) 265 return ((int)set_errno(EINVAL)); 266 } 267 return (0); 268 } 269