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 * $FreeBSD$ 23 * 24 */ 25 /* 26 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/types.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/kmem.h> 39 #include <sys/smp.h> 40 #include <sys/dtrace_impl.h> 41 #include <sys/dtrace_bsd.h> 42 #include <machine/clock.h> 43 #include <machine/frame.h> 44 #include <machine/trap.h> 45 #include <vm/pmap.h> 46 47 #define DELAYBRANCH(x) ((int)(x) < 0) 48 49 extern uintptr_t dtrace_in_probe_addr; 50 extern int dtrace_in_probe; 51 extern dtrace_id_t dtrace_probeid_error; 52 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 53 54 int dtrace_invop(uintptr_t, uintptr_t *, uintptr_t); 55 void dtrace_invop_init(void); 56 void dtrace_invop_uninit(void); 57 58 typedef struct dtrace_invop_hdlr { 59 int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t); 60 struct dtrace_invop_hdlr *dtih_next; 61 } dtrace_invop_hdlr_t; 62 63 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 64 65 int 66 dtrace_invop(uintptr_t addr, uintptr_t *stack, uintptr_t eax) 67 { 68 dtrace_invop_hdlr_t *hdlr; 69 int rval; 70 71 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 72 if ((rval = hdlr->dtih_func(addr, stack, eax)) != 0) 73 return (rval); 74 75 return (0); 76 } 77 78 void 79 dtrace_invop_add(int (*func)(uintptr_t, uintptr_t *, uintptr_t)) 80 { 81 dtrace_invop_hdlr_t *hdlr; 82 83 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 84 hdlr->dtih_func = func; 85 hdlr->dtih_next = dtrace_invop_hdlr; 86 dtrace_invop_hdlr = hdlr; 87 } 88 89 void 90 dtrace_invop_remove(int (*func)(uintptr_t, uintptr_t *, uintptr_t)) 91 { 92 dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *prev = NULL; 93 94 for (;;) { 95 if (hdlr == NULL) 96 panic("attempt to remove non-existent invop handler"); 97 98 if (hdlr->dtih_func == func) 99 break; 100 101 prev = hdlr; 102 hdlr = hdlr->dtih_next; 103 } 104 105 if (prev == NULL) { 106 ASSERT(dtrace_invop_hdlr == hdlr); 107 dtrace_invop_hdlr = hdlr->dtih_next; 108 } else { 109 ASSERT(dtrace_invop_hdlr != hdlr); 110 prev->dtih_next = hdlr->dtih_next; 111 } 112 113 kmem_free(hdlr, 0); 114 } 115 116 117 /*ARGSUSED*/ 118 void 119 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 120 { 121 /* 122 * No toxic regions? 123 */ 124 } 125 126 void 127 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 128 { 129 cpuset_t cpus; 130 131 if (cpu == DTRACE_CPUALL) 132 cpus = all_cpus; 133 else 134 CPU_SETOF(cpu, &cpus); 135 136 smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func, 137 smp_no_rendevous_barrier, arg); 138 } 139 140 static void 141 dtrace_sync_func(void) 142 { 143 } 144 145 void 146 dtrace_sync(void) 147 { 148 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 149 } 150 151 /* 152 * DTrace needs a high resolution time function which can 153 * be called from a probe context and guaranteed not to have 154 * instrumented with probes itself. 155 * 156 * Returns nanoseconds since boot. 157 */ 158 uint64_t 159 dtrace_gethrtime() 160 { 161 struct timespec curtime; 162 163 nanouptime(&curtime); 164 165 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 166 167 } 168 169 uint64_t 170 dtrace_gethrestime(void) 171 { 172 struct timespec curtime; 173 174 getnanotime(&curtime); 175 176 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 177 } 178 179 /* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */ 180 int 181 dtrace_trap(struct trapframe *frame, u_int type) 182 { 183 /* 184 * A trap can occur while DTrace executes a probe. Before 185 * executing the probe, DTrace blocks re-scheduling and sets 186 * a flag in it's per-cpu flags to indicate that it doesn't 187 * want to fault. On returning from the probe, the no-fault 188 * flag is cleared and finally re-scheduling is enabled. 189 * 190 * Check if DTrace has enabled 'no-fault' mode: 191 * 192 */ 193 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 194 /* 195 * There are only a couple of trap types that are expected. 196 * All the rest will be handled in the usual way. 197 */ 198 switch (type) { 199 /* Page fault. */ 200 case EXC_DSI: 201 case EXC_DSE: 202 /* Flag a bad address. */ 203 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 204 cpu_core[curcpu].cpuc_dtrace_illval = frame->cpu.aim.dar; 205 206 /* 207 * Offset the instruction pointer to the instruction 208 * following the one causing the fault. 209 */ 210 frame->srr0 += sizeof(int); 211 return (1); 212 case EXC_ISI: 213 case EXC_ISE: 214 /* Flag a bad address. */ 215 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 216 cpu_core[curcpu].cpuc_dtrace_illval = frame->srr0; 217 218 /* 219 * Offset the instruction pointer to the instruction 220 * following the one causing the fault. 221 */ 222 frame->srr0 += sizeof(int); 223 return (1); 224 default: 225 /* Handle all other traps in the usual way. */ 226 break; 227 } 228 } 229 230 /* Handle the trap in the usual way. */ 231 return (0); 232 } 233 234 void 235 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 236 int fault, int fltoffs, uintptr_t illval) 237 { 238 239 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 240 (uintptr_t)epid, 241 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 242 } 243 244 static int 245 dtrace_invop_start(struct trapframe *frame) 246 { 247 switch (dtrace_invop(frame->srr0, (uintptr_t *)frame, frame->fixreg[3])) { 248 case DTRACE_INVOP_JUMP: 249 break; 250 case DTRACE_INVOP_BCTR: 251 frame->srr0 = frame->ctr; 252 break; 253 case DTRACE_INVOP_BLR: 254 frame->srr0 = frame->lr; 255 break; 256 case DTRACE_INVOP_MFLR_R0: 257 frame->fixreg[0] = frame->lr ; 258 break; 259 default: 260 return (-1); 261 break; 262 } 263 264 return (0); 265 } 266 267 void dtrace_invop_init(void) 268 { 269 dtrace_invop_jump_addr = dtrace_invop_start; 270 } 271 272 void dtrace_invop_uninit(void) 273 { 274 dtrace_invop_jump_addr = 0; 275 } 276