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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 * 21 * Portions Copyright 2006-2008 John Birrell jb@freebsd.org 22 * 23 * $FreeBSD$ 24 * 25 */ 26 27 #ifndef KDTRACE_HOOKS 28 #define KDTRACE_HOOKS 29 #endif 30 31 #include <sys/cdefs.h> 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/conf.h> 35 #include <sys/kernel.h> 36 #include <sys/limits.h> 37 #include <sys/lock.h> 38 #include <sys/linker.h> 39 #include <sys/module.h> 40 #include <sys/mutex.h> 41 42 #include <sys/dtrace.h> 43 #include <sys/sdt.h> 44 45 #define SDT_ADDR2NDX(addr) (((uintptr_t)(addr)) >> 4) 46 47 static d_open_t sdt_open; 48 static int sdt_unload(void); 49 static void sdt_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *); 50 static void sdt_provide_probes(void *, dtrace_probedesc_t *); 51 static void sdt_destroy(void *, dtrace_id_t, void *); 52 static void sdt_enable(void *, dtrace_id_t, void *); 53 static void sdt_disable(void *, dtrace_id_t, void *); 54 static void sdt_load(void *); 55 56 static struct cdevsw sdt_cdevsw = { 57 .d_version = D_VERSION, 58 .d_open = sdt_open, 59 .d_name = "sdt", 60 }; 61 62 static dtrace_pattr_t sdt_attr = { 63 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON }, 64 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, 65 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA }, 66 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON }, 67 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA }, 68 }; 69 70 static dtrace_pops_t sdt_pops = { 71 sdt_provide_probes, 72 NULL, 73 sdt_enable, 74 sdt_disable, 75 NULL, 76 NULL, 77 sdt_getargdesc, 78 NULL, 79 NULL, 80 sdt_destroy 81 }; 82 83 static struct cdev *sdt_cdev; 84 85 static int 86 sdt_argtype_callback(struct sdt_argtype *argtype, void *arg) 87 { 88 dtrace_argdesc_t *desc = arg; 89 90 if (desc->dtargd_ndx == argtype->ndx) { 91 desc->dtargd_mapping = desc->dtargd_ndx; /* XXX */ 92 strlcpy(desc->dtargd_native, argtype->type, 93 sizeof(desc->dtargd_native)); 94 desc->dtargd_xlate[0] = '\0'; /* XXX */ 95 } 96 97 return (0); 98 } 99 100 static void 101 sdt_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc) 102 { 103 struct sdt_probe *probe = parg; 104 105 if (desc->dtargd_ndx < probe->n_args) 106 (void) (sdt_argtype_listall(probe, sdt_argtype_callback, desc)); 107 else 108 desc->dtargd_ndx = DTRACE_ARGNONE; 109 110 return; 111 } 112 113 static int 114 sdt_probe_callback(struct sdt_probe *probe, void *arg __unused) 115 { 116 struct sdt_provider *prov = probe->prov; 117 char mod[64]; 118 char func[64]; 119 char name[64]; 120 121 /* 122 * Unfortunately this is necessary because the Solaris DTrace 123 * code mixes consts and non-consts with casts to override 124 * the incompatibilies. On FreeBSD, we use strict warnings 125 * in gcc, so we have to respect const vs non-const. 126 */ 127 strlcpy(mod, probe->mod, sizeof(mod)); 128 strlcpy(func, probe->func, sizeof(func)); 129 strlcpy(name, probe->name, sizeof(name)); 130 131 if (dtrace_probe_lookup(prov->id, mod, func, name) != 0) 132 return (0); 133 134 (void) dtrace_probe_create(prov->id, probe->mod, probe->func, 135 probe->name, 0, probe); 136 137 return (0); 138 } 139 140 static int 141 sdt_provider_entry(struct sdt_provider *prov, void *arg) 142 { 143 return (sdt_probe_listall(prov, sdt_probe_callback, NULL)); 144 } 145 146 static void 147 sdt_provide_probes(void *arg, dtrace_probedesc_t *desc) 148 { 149 if (desc != NULL) 150 return; 151 152 (void) sdt_provider_listall(sdt_provider_entry, NULL); 153 } 154 155 static void 156 sdt_destroy(void *arg, dtrace_id_t id, void *parg) 157 { 158 /* Nothing to do here. */ 159 } 160 161 static void 162 sdt_enable(void *arg, dtrace_id_t id, void *parg) 163 { 164 struct sdt_probe *probe = parg; 165 166 probe->id = id; 167 } 168 169 static void 170 sdt_disable(void *arg, dtrace_id_t id, void *parg) 171 { 172 struct sdt_probe *probe = parg; 173 174 probe->id = 0; 175 } 176 177 static int 178 sdt_provider_reg_callback(struct sdt_provider *prov, void *arg __unused) 179 { 180 return (dtrace_register(prov->name, &sdt_attr, DTRACE_PRIV_USER, 181 NULL, &sdt_pops, NULL, (dtrace_provider_id_t *) &prov->id)); 182 } 183 184 static void 185 sdt_load(void *dummy) 186 { 187 /* Create the /dev/dtrace/sdt entry. */ 188 sdt_cdev = make_dev(&sdt_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, 189 "dtrace/sdt"); 190 191 sdt_probe_func = dtrace_probe; 192 193 (void) sdt_provider_listall(sdt_provider_reg_callback, NULL); 194 } 195 196 static int 197 sdt_provider_unreg_callback(struct sdt_provider *prov, void *arg __unused) 198 { 199 return (dtrace_unregister(prov->id)); 200 } 201 202 static int 203 sdt_unload() 204 { 205 int error = 0; 206 207 sdt_probe_func = sdt_probe_stub; 208 209 (void) sdt_provider_listall(sdt_provider_unreg_callback, NULL); 210 211 destroy_dev(sdt_cdev); 212 213 return (error); 214 } 215 216 /* ARGSUSED */ 217 static int 218 sdt_modevent(module_t mod __unused, int type, void *data __unused) 219 { 220 int error = 0; 221 222 switch (type) { 223 case MOD_LOAD: 224 break; 225 226 case MOD_UNLOAD: 227 break; 228 229 case MOD_SHUTDOWN: 230 break; 231 232 default: 233 error = EOPNOTSUPP; 234 break; 235 236 } 237 238 return (error); 239 } 240 241 /* ARGSUSED */ 242 static int 243 sdt_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused) 244 { 245 return (0); 246 } 247 248 SYSINIT(sdt_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, sdt_load, NULL); 249 SYSUNINIT(sdt_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, sdt_unload, NULL); 250 251 DEV_MODULE(sdt, sdt_modevent, NULL); 252 MODULE_VERSION(sdt, 1); 253 MODULE_DEPEND(sdt, dtrace, 1, 1, 1); 254 MODULE_DEPEND(sdt, opensolaris, 1, 1, 1); 255