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 uintptr_t dtrace_in_probe_addr; 49 extern int dtrace_in_probe; 50 extern dtrace_id_t dtrace_probeid_error; 51 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 52 extern void dtrace_getnanotime(struct timespec *tsp); 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 79 void 80 dtrace_invop_add(int (*func)(uintptr_t, uintptr_t *, 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, uintptr_t *, 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 printf("IMPLEMENT ME: dtrace_toxic_ranges\n"); 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_rendevous_barrier, func, 139 smp_no_rendevous_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 nanouptime(&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 it's 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 int 236 dtrace_invop_start(struct trapframe *frame) 237 { 238 int data, invop, reg, update_sp; 239 register_t arg1, arg2; 240 register_t *sp; 241 int offs; 242 int tmp; 243 int i; 244 245 invop = dtrace_invop(frame->tf_elr, (uintptr_t *)frame, frame->tf_elr); 246 247 tmp = (invop & LDP_STP_MASK); 248 if (tmp == STP_64 || tmp == LDP_64) { 249 sp = (register_t *)frame->tf_sp; 250 data = invop; 251 arg1 = (data >> ARG1_SHIFT) & ARG1_MASK; 252 arg2 = (data >> ARG2_SHIFT) & ARG2_MASK; 253 254 offs = (data >> OFFSET_SHIFT) & OFFSET_MASK; 255 256 switch (tmp) { 257 case STP_64: 258 if (offs >> (OFFSET_SIZE - 1)) 259 sp -= (~offs & OFFSET_MASK) + 1; 260 else 261 sp += (offs); 262 *(sp + 0) = frame->tf_x[arg1]; 263 *(sp + 1) = frame->tf_x[arg2]; 264 break; 265 case LDP_64: 266 frame->tf_x[arg1] = *(sp + 0); 267 frame->tf_x[arg2] = *(sp + 1); 268 if (offs >> (OFFSET_SIZE - 1)) 269 sp -= (~offs & OFFSET_MASK) + 1; 270 else 271 sp += (offs); 272 break; 273 default: 274 break; 275 } 276 277 /* Update the stack pointer and program counter to continue */ 278 frame->tf_sp = (register_t)sp; 279 frame->tf_elr += INSN_SIZE; 280 return (0); 281 } 282 283 if ((invop & B_MASK) == B_INSTR) { 284 data = (invop & B_DATA_MASK); 285 /* The data is the number of 4-byte words to change the pc */ 286 data *= 4; 287 frame->tf_elr += data; 288 return (0); 289 } 290 291 if (invop == RET_INSTR) { 292 frame->tf_elr = frame->tf_lr; 293 return (0); 294 } 295 296 return (-1); 297 } 298 299 void 300 dtrace_invop_init(void) 301 { 302 303 dtrace_invop_jump_addr = dtrace_invop_start; 304 } 305 306 void 307 dtrace_invop_uninit(void) 308 { 309 310 dtrace_invop_jump_addr = 0; 311 } 312