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 <machine/vmparam.h> 47 #include <vm/pmap.h> 48 49 extern dtrace_id_t dtrace_probeid_error; 50 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 51 extern void dtrace_getnanotime(struct timespec *tsp); 52 extern void dtrace_getnanouptime(struct timespec *tsp); 53 54 int dtrace_invop(uintptr_t, struct trapframe *, 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, struct trapframe *, 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, struct trapframe *frame, 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, frame, eax)) != 0) 73 return (rval); 74 75 return (0); 76 } 77 78 79 void 80 dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 81 { 82 dtrace_invop_hdlr_t *hdlr; 83 84 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 85 hdlr->dtih_func = func; 86 hdlr->dtih_next = dtrace_invop_hdlr; 87 dtrace_invop_hdlr = hdlr; 88 } 89 90 void 91 dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 92 { 93 dtrace_invop_hdlr_t *hdlr, *prev; 94 95 hdlr = dtrace_invop_hdlr; 96 prev = NULL; 97 98 for (;;) { 99 if (hdlr == NULL) 100 panic("attempt to remove non-existent invop handler"); 101 102 if (hdlr->dtih_func == func) 103 break; 104 105 prev = hdlr; 106 hdlr = hdlr->dtih_next; 107 } 108 109 if (prev == NULL) { 110 ASSERT(dtrace_invop_hdlr == hdlr); 111 dtrace_invop_hdlr = hdlr->dtih_next; 112 } else { 113 ASSERT(dtrace_invop_hdlr != hdlr); 114 prev->dtih_next = hdlr->dtih_next; 115 } 116 117 kmem_free(hdlr, 0); 118 } 119 120 /*ARGSUSED*/ 121 void 122 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 123 { 124 125 (*func)(0, (uintptr_t)VM_MIN_KERNEL_ADDRESS); 126 } 127 128 void 129 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 130 { 131 cpuset_t cpus; 132 133 if (cpu == DTRACE_CPUALL) 134 cpus = all_cpus; 135 else 136 CPU_SETOF(cpu, &cpus); 137 138 smp_rendezvous_cpus(cpus, smp_no_rendezvous_barrier, func, 139 smp_no_rendezvous_barrier, arg); 140 } 141 142 static void 143 dtrace_sync_func(void) 144 { 145 146 } 147 148 void 149 dtrace_sync(void) 150 { 151 152 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 153 } 154 155 /* 156 * DTrace needs a high resolution time function which can 157 * be called from a probe context and guaranteed not to have 158 * instrumented with probes itself. 159 * 160 * Returns nanoseconds since boot. 161 */ 162 uint64_t 163 dtrace_gethrtime() 164 { 165 struct timespec curtime; 166 167 dtrace_getnanouptime(&curtime); 168 169 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 170 171 } 172 173 uint64_t 174 dtrace_gethrestime(void) 175 { 176 struct timespec current_time; 177 178 dtrace_getnanotime(¤t_time); 179 180 return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec); 181 } 182 183 /* Function to handle DTrace traps during probes. See arm64/arm64/trap.c */ 184 int 185 dtrace_trap(struct trapframe *frame, u_int type) 186 { 187 /* 188 * A trap can occur while DTrace executes a probe. Before 189 * executing the probe, DTrace blocks re-scheduling and sets 190 * a flag in its per-cpu flags to indicate that it doesn't 191 * want to fault. On returning from the probe, the no-fault 192 * flag is cleared and finally re-scheduling is enabled. 193 * 194 * Check if DTrace has enabled 'no-fault' mode: 195 * 196 */ 197 198 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 199 /* 200 * There are only a couple of trap types that are expected. 201 * All the rest will be handled in the usual way. 202 */ 203 switch (type) { 204 case EXCP_DATA_ABORT: 205 /* Flag a bad address. */ 206 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 207 cpu_core[curcpu].cpuc_dtrace_illval = 0; 208 209 /* 210 * Offset the instruction pointer to the instruction 211 * following the one causing the fault. 212 */ 213 frame->tf_elr += 4; 214 return (1); 215 default: 216 /* Handle all other traps in the usual way. */ 217 break; 218 } 219 } 220 221 /* Handle the trap in the usual way. */ 222 return (0); 223 } 224 225 void 226 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 227 int fault, int fltoffs, uintptr_t illval) 228 { 229 230 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 231 (uintptr_t)epid, 232 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 233 } 234 235 static void 236 dtrace_load64(uint64_t *addr, struct trapframe *frame, u_int reg) 237 { 238 239 KASSERT(reg <= 31, ("dtrace_load64: Invalid register %u", reg)); 240 if (reg < nitems(frame->tf_x)) 241 frame->tf_x[reg] = *addr; 242 else if (reg == 30) /* lr */ 243 frame->tf_lr = *addr; 244 /* Nothing to do for load to xzr */ 245 } 246 247 static void 248 dtrace_store64(uint64_t *addr, struct trapframe *frame, u_int reg) 249 { 250 251 KASSERT(reg <= 31, ("dtrace_store64: Invalid register %u", reg)); 252 if (reg < nitems(frame->tf_x)) 253 *addr = frame->tf_x[reg]; 254 else if (reg == 30) /* lr */ 255 *addr = frame->tf_lr; 256 else if (reg == 31) /* xzr */ 257 *addr = 0; 258 } 259 260 static int 261 dtrace_invop_start(struct trapframe *frame) 262 { 263 int data, invop, reg, update_sp; 264 register_t arg1, arg2; 265 register_t *sp; 266 int offs; 267 int tmp; 268 int i; 269 270 invop = dtrace_invop(frame->tf_elr, frame, frame->tf_elr); 271 272 tmp = (invop & LDP_STP_MASK); 273 if (tmp == STP_64 || tmp == LDP_64) { 274 sp = (register_t *)frame->tf_sp; 275 data = invop; 276 arg1 = (data >> ARG1_SHIFT) & ARG1_MASK; 277 arg2 = (data >> ARG2_SHIFT) & ARG2_MASK; 278 279 offs = (data >> OFFSET_SHIFT) & OFFSET_MASK; 280 281 switch (tmp) { 282 case STP_64: 283 if (offs >> (OFFSET_SIZE - 1)) 284 sp -= (~offs & OFFSET_MASK) + 1; 285 else 286 sp += (offs); 287 dtrace_store64(sp + 0, frame, arg1); 288 dtrace_store64(sp + 1, frame, arg2); 289 break; 290 case LDP_64: 291 dtrace_load64(sp + 0, frame, arg1); 292 dtrace_load64(sp + 1, frame, arg2); 293 if (offs >> (OFFSET_SIZE - 1)) 294 sp -= (~offs & OFFSET_MASK) + 1; 295 else 296 sp += (offs); 297 break; 298 default: 299 break; 300 } 301 302 /* Update the stack pointer and program counter to continue */ 303 frame->tf_sp = (register_t)sp; 304 frame->tf_elr += INSN_SIZE; 305 return (0); 306 } 307 308 if ((invop & SUB_MASK) == SUB_INSTR) { 309 frame->tf_sp -= (invop >> SUB_IMM_SHIFT) & SUB_IMM_MASK; 310 frame->tf_elr += INSN_SIZE; 311 return (0); 312 } 313 314 if ((invop & B_MASK) == B_INSTR) { 315 data = (invop & B_DATA_MASK); 316 /* The data is the number of 4-byte words to change the pc */ 317 data *= 4; 318 frame->tf_elr += data; 319 return (0); 320 } 321 322 if (invop == RET_INSTR) { 323 frame->tf_elr = frame->tf_lr; 324 return (0); 325 } 326 327 return (-1); 328 } 329 330 void 331 dtrace_invop_init(void) 332 { 333 334 dtrace_invop_jump_addr = dtrace_invop_start; 335 } 336 337 void 338 dtrace_invop_uninit(void) 339 { 340 341 dtrace_invop_jump_addr = 0; 342 } 343