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 #define DELAYBRANCH(x) ((int)(x) < 0) 49 50 #define BIT_PC 15 51 #define BIT_LR 14 52 #define BIT_SP 13 53 54 extern uintptr_t dtrace_in_probe_addr; 55 extern int dtrace_in_probe; 56 extern dtrace_id_t dtrace_probeid_error; 57 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 58 extern void dtrace_getnanotime(struct timespec *tsp); 59 60 int dtrace_invop(uintptr_t, uintptr_t *, uintptr_t); 61 void dtrace_invop_init(void); 62 void dtrace_invop_uninit(void); 63 64 typedef struct dtrace_invop_hdlr { 65 int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t); 66 struct dtrace_invop_hdlr *dtih_next; 67 } dtrace_invop_hdlr_t; 68 69 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 70 71 int 72 dtrace_invop(uintptr_t addr, uintptr_t *stack, uintptr_t eax) 73 { 74 dtrace_invop_hdlr_t *hdlr; 75 int rval; 76 77 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 78 if ((rval = hdlr->dtih_func(addr, stack, eax)) != 0) 79 return (rval); 80 81 return (0); 82 } 83 84 85 void 86 dtrace_invop_add(int (*func)(uintptr_t, uintptr_t *, uintptr_t)) 87 { 88 dtrace_invop_hdlr_t *hdlr; 89 90 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 91 hdlr->dtih_func = func; 92 hdlr->dtih_next = dtrace_invop_hdlr; 93 dtrace_invop_hdlr = hdlr; 94 } 95 96 void 97 dtrace_invop_remove(int (*func)(uintptr_t, uintptr_t *, uintptr_t)) 98 { 99 dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *prev = NULL; 100 101 for (;;) { 102 if (hdlr == NULL) 103 panic("attempt to remove non-existent invop handler"); 104 105 if (hdlr->dtih_func == func) 106 break; 107 108 prev = hdlr; 109 hdlr = hdlr->dtih_next; 110 } 111 112 if (prev == NULL) { 113 ASSERT(dtrace_invop_hdlr == hdlr); 114 dtrace_invop_hdlr = hdlr->dtih_next; 115 } else { 116 ASSERT(dtrace_invop_hdlr != hdlr); 117 prev->dtih_next = hdlr->dtih_next; 118 } 119 120 kmem_free(hdlr, 0); 121 } 122 123 124 /*ARGSUSED*/ 125 void 126 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 127 { 128 printf("IMPLEMENT ME: dtrace_toxic_ranges\n"); 129 } 130 131 void 132 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 133 { 134 cpuset_t cpus; 135 136 if (cpu == DTRACE_CPUALL) 137 cpus = all_cpus; 138 else 139 CPU_SETOF(cpu, &cpus); 140 141 smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func, 142 smp_no_rendevous_barrier, arg); 143 } 144 145 static void 146 dtrace_sync_func(void) 147 { 148 } 149 150 void 151 dtrace_sync(void) 152 { 153 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 154 } 155 156 /* 157 * DTrace needs a high resolution time function which can 158 * be called from a probe context and guaranteed not to have 159 * instrumented with probes itself. 160 * 161 * Returns nanoseconds since boot. 162 */ 163 uint64_t 164 dtrace_gethrtime() 165 { 166 struct timespec curtime; 167 168 nanouptime(&curtime); 169 170 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 171 172 } 173 174 uint64_t 175 dtrace_gethrestime(void) 176 { 177 struct timespec current_time; 178 179 dtrace_getnanotime(¤t_time); 180 181 return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec); 182 } 183 184 /* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */ 185 int 186 dtrace_trap(struct trapframe *frame, u_int type) 187 { 188 /* 189 * A trap can occur while DTrace executes a probe. Before 190 * executing the probe, DTrace blocks re-scheduling and sets 191 * a flag in it's per-cpu flags to indicate that it doesn't 192 * want to fault. On returning from the probe, the no-fault 193 * flag is cleared and finally re-scheduling is enabled. 194 * 195 * Check if DTrace has enabled 'no-fault' mode: 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 /* Page fault. */ 205 case FAULT_ALIGN: 206 /* Flag a bad address. */ 207 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 208 cpu_core[curcpu].cpuc_dtrace_illval = 0; 209 210 /* 211 * Offset the instruction pointer to the instruction 212 * following the one causing the fault. 213 */ 214 frame->tf_pc += sizeof(int); 215 return (1); 216 default: 217 /* Handle all other traps in the usual way. */ 218 break; 219 } 220 } 221 222 /* Handle the trap in the usual way. */ 223 return (0); 224 } 225 226 void 227 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 228 int fault, int fltoffs, uintptr_t illval) 229 { 230 231 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 232 (uintptr_t)epid, 233 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 234 } 235 236 static int 237 dtrace_invop_start(struct trapframe *frame) 238 { 239 register_t *r0, *sp; 240 int data, invop, reg, update_sp; 241 242 invop = dtrace_invop(frame->tf_pc, (uintptr_t *)frame, frame->tf_pc); 243 switch (invop & DTRACE_INVOP_MASK) { 244 case DTRACE_INVOP_PUSHM: 245 sp = (register_t *)frame->tf_svc_sp; 246 r0 = &frame->tf_r0; 247 data = DTRACE_INVOP_DATA(invop); 248 249 /* 250 * Store the pc, lr, and sp. These have their own 251 * entries in the struct. 252 */ 253 if (data & (1 << BIT_PC)) { 254 sp--; 255 *sp = frame->tf_pc; 256 } 257 if (data & (1 << BIT_LR)) { 258 sp--; 259 *sp = frame->tf_svc_lr; 260 } 261 if (data & (1 << BIT_SP)) { 262 sp--; 263 *sp = frame->tf_svc_sp; 264 } 265 266 /* Store the general registers */ 267 for (reg = 12; reg >= 0; reg--) { 268 if (data & (1 << reg)) { 269 sp--; 270 *sp = r0[reg]; 271 } 272 } 273 274 /* Update the stack pointer and program counter to continue */ 275 frame->tf_svc_sp = (register_t)sp; 276 frame->tf_pc += 4; 277 break; 278 case DTRACE_INVOP_POPM: 279 sp = (register_t *)frame->tf_svc_sp; 280 r0 = &frame->tf_r0; 281 data = DTRACE_INVOP_DATA(invop); 282 283 /* Read the general registers */ 284 for (reg = 0; reg <= 12; reg++) { 285 if (data & (1 << reg)) { 286 r0[reg] = *sp; 287 sp++; 288 } 289 } 290 291 /* 292 * Set the stack pointer. If we don't update it here we will 293 * need to update it at the end as the instruction would do 294 */ 295 update_sp = 1; 296 if (data & (1 << BIT_SP)) { 297 frame->tf_svc_sp = *sp; 298 *sp++; 299 update_sp = 0; 300 } 301 302 /* Update the link register, we need to use the correct copy */ 303 if (data & (1 << BIT_LR)) { 304 frame->tf_svc_lr = *sp; 305 *sp++; 306 } 307 /* 308 * And the program counter. If it's not in the list skip over 309 * it when we return so to not hit this again. 310 */ 311 if (data & (1 << BIT_PC)) { 312 frame->tf_pc = *sp; 313 *sp++; 314 } else 315 frame->tf_pc += 4; 316 317 /* Update the stack pointer if we haven't already done so */ 318 if (update_sp) 319 frame->tf_svc_sp = (register_t)sp; 320 break; 321 case DTRACE_INVOP_B: 322 data = DTRACE_INVOP_DATA(invop) & 0x00ffffff; 323 /* Sign extend the data */ 324 if ((data & (1 << 23)) != 0) 325 data |= 0xff000000; 326 /* The data is the number of 4-byte words to change the pc */ 327 data *= 4; 328 data += 8; 329 frame->tf_pc += data; 330 break; 331 default: 332 return (-1); 333 break; 334 } 335 336 return (0); 337 } 338 339 void dtrace_invop_init(void) 340 { 341 dtrace_invop_jump_addr = dtrace_invop_start; 342 } 343 344 void dtrace_invop_uninit(void) 345 { 346 dtrace_invop_jump_addr = 0; 347 } 348