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/armreg.h> 43 #include <machine/clock.h> 44 #include <machine/frame.h> 45 #include <machine/trap.h> 46 #include <vm/pmap.h> 47 48 extern dtrace_id_t dtrace_probeid_error; 49 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 50 extern void dtrace_getnanotime(struct timespec *tsp); 51 52 int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t); 53 void dtrace_invop_init(void); 54 void dtrace_invop_uninit(void); 55 56 typedef struct dtrace_invop_hdlr { 57 int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t); 58 struct dtrace_invop_hdlr *dtih_next; 59 } dtrace_invop_hdlr_t; 60 61 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 62 63 int 64 dtrace_invop(uintptr_t addr, struct trapframe *frame, uintptr_t eax) 65 { 66 dtrace_invop_hdlr_t *hdlr; 67 int rval; 68 69 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 70 if ((rval = hdlr->dtih_func(addr, frame, eax)) != 0) 71 return (rval); 72 73 return (0); 74 } 75 76 77 void 78 dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 79 { 80 dtrace_invop_hdlr_t *hdlr; 81 82 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 83 hdlr->dtih_func = func; 84 hdlr->dtih_next = dtrace_invop_hdlr; 85 dtrace_invop_hdlr = hdlr; 86 } 87 88 void 89 dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 90 { 91 dtrace_invop_hdlr_t *hdlr, *prev; 92 93 hdlr = dtrace_invop_hdlr; 94 prev = NULL; 95 96 for (;;) { 97 if (hdlr == NULL) 98 panic("attempt to remove non-existent invop handler"); 99 100 if (hdlr->dtih_func == func) 101 break; 102 103 prev = hdlr; 104 hdlr = hdlr->dtih_next; 105 } 106 107 if (prev == NULL) { 108 ASSERT(dtrace_invop_hdlr == hdlr); 109 dtrace_invop_hdlr = hdlr->dtih_next; 110 } else { 111 ASSERT(dtrace_invop_hdlr != hdlr); 112 prev->dtih_next = hdlr->dtih_next; 113 } 114 115 kmem_free(hdlr, 0); 116 } 117 118 /*ARGSUSED*/ 119 void 120 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 121 { 122 123 (*func)(0, (uintptr_t)VM_MIN_KERNEL_ADDRESS); 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 } 145 146 void 147 dtrace_sync(void) 148 { 149 150 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 151 } 152 153 /* 154 * DTrace needs a high resolution time function which can 155 * be called from a probe context and guaranteed not to have 156 * instrumented with probes itself. 157 * 158 * Returns nanoseconds since boot. 159 */ 160 uint64_t 161 dtrace_gethrtime() 162 { 163 struct timespec curtime; 164 165 nanouptime(&curtime); 166 167 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 168 169 } 170 171 uint64_t 172 dtrace_gethrestime(void) 173 { 174 struct timespec current_time; 175 176 dtrace_getnanotime(¤t_time); 177 178 return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec); 179 } 180 181 /* Function to handle DTrace traps during probes. See arm64/arm64/trap.c */ 182 int 183 dtrace_trap(struct trapframe *frame, u_int type) 184 { 185 /* 186 * A trap can occur while DTrace executes a probe. Before 187 * executing the probe, DTrace blocks re-scheduling and sets 188 * a flag in it's per-cpu flags to indicate that it doesn't 189 * want to fault. On returning from the probe, the no-fault 190 * flag is cleared and finally re-scheduling is enabled. 191 * 192 * Check if DTrace has enabled 'no-fault' mode: 193 * 194 */ 195 196 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 197 /* 198 * There are only a couple of trap types that are expected. 199 * All the rest will be handled in the usual way. 200 */ 201 switch (type) { 202 case EXCP_DATA_ABORT: 203 /* Flag a bad address. */ 204 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 205 cpu_core[curcpu].cpuc_dtrace_illval = 0; 206 207 /* 208 * Offset the instruction pointer to the instruction 209 * following the one causing the fault. 210 */ 211 frame->tf_elr += 4; 212 return (1); 213 default: 214 /* Handle all other traps in the usual way. */ 215 break; 216 } 217 } 218 219 /* Handle the trap in the usual way. */ 220 return (0); 221 } 222 223 void 224 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 225 int fault, int fltoffs, uintptr_t illval) 226 { 227 228 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 229 (uintptr_t)epid, 230 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 231 } 232 233 static int 234 dtrace_invop_start(struct trapframe *frame) 235 { 236 int data, invop, reg, update_sp; 237 register_t arg1, arg2; 238 register_t *sp; 239 int offs; 240 int tmp; 241 int i; 242 243 invop = dtrace_invop(frame->tf_elr, frame, frame->tf_elr); 244 245 tmp = (invop & LDP_STP_MASK); 246 if (tmp == STP_64 || tmp == LDP_64) { 247 sp = (register_t *)frame->tf_sp; 248 data = invop; 249 arg1 = (data >> ARG1_SHIFT) & ARG1_MASK; 250 arg2 = (data >> ARG2_SHIFT) & ARG2_MASK; 251 252 offs = (data >> OFFSET_SHIFT) & OFFSET_MASK; 253 254 switch (tmp) { 255 case STP_64: 256 if (offs >> (OFFSET_SIZE - 1)) 257 sp -= (~offs & OFFSET_MASK) + 1; 258 else 259 sp += (offs); 260 *(sp + 0) = frame->tf_x[arg1]; 261 *(sp + 1) = frame->tf_x[arg2]; 262 break; 263 case LDP_64: 264 frame->tf_x[arg1] = *(sp + 0); 265 frame->tf_x[arg2] = *(sp + 1); 266 if (offs >> (OFFSET_SIZE - 1)) 267 sp -= (~offs & OFFSET_MASK) + 1; 268 else 269 sp += (offs); 270 break; 271 default: 272 break; 273 } 274 275 /* Update the stack pointer and program counter to continue */ 276 frame->tf_sp = (register_t)sp; 277 frame->tf_elr += INSN_SIZE; 278 return (0); 279 } 280 281 if ((invop & B_MASK) == B_INSTR) { 282 data = (invop & B_DATA_MASK); 283 /* The data is the number of 4-byte words to change the pc */ 284 data *= 4; 285 frame->tf_elr += data; 286 return (0); 287 } 288 289 if (invop == RET_INSTR) { 290 frame->tf_elr = frame->tf_lr; 291 return (0); 292 } 293 294 return (-1); 295 } 296 297 void 298 dtrace_invop_init(void) 299 { 300 301 dtrace_invop_jump_addr = dtrace_invop_start; 302 } 303 304 void 305 dtrace_invop_uninit(void) 306 { 307 308 dtrace_invop_jump_addr = 0; 309 } 310