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 dtrace_id_t dtrace_probeid_error; 55 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 56 extern void dtrace_getnanotime(struct timespec *tsp); 57 58 int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t); 59 void dtrace_invop_init(void); 60 void dtrace_invop_uninit(void); 61 62 typedef struct dtrace_invop_hdlr { 63 int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t); 64 struct dtrace_invop_hdlr *dtih_next; 65 } dtrace_invop_hdlr_t; 66 67 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 68 69 int 70 dtrace_invop(uintptr_t addr, struct trapframe *frame, uintptr_t eax) 71 { 72 dtrace_invop_hdlr_t *hdlr; 73 int rval; 74 75 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 76 if ((rval = hdlr->dtih_func(addr, frame, eax)) != 0) 77 return (rval); 78 79 return (0); 80 } 81 82 83 void 84 dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 85 { 86 dtrace_invop_hdlr_t *hdlr; 87 88 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 89 hdlr->dtih_func = func; 90 hdlr->dtih_next = dtrace_invop_hdlr; 91 dtrace_invop_hdlr = hdlr; 92 } 93 94 void 95 dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 96 { 97 dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *prev = NULL; 98 99 for (;;) { 100 if (hdlr == NULL) 101 panic("attempt to remove non-existent invop handler"); 102 103 if (hdlr->dtih_func == func) 104 break; 105 106 prev = hdlr; 107 hdlr = hdlr->dtih_next; 108 } 109 110 if (prev == NULL) { 111 ASSERT(dtrace_invop_hdlr == hdlr); 112 dtrace_invop_hdlr = hdlr->dtih_next; 113 } else { 114 ASSERT(dtrace_invop_hdlr != hdlr); 115 prev->dtih_next = hdlr->dtih_next; 116 } 117 118 kmem_free(hdlr, 0); 119 } 120 121 122 /*ARGSUSED*/ 123 void 124 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 125 { 126 printf("IMPLEMENT ME: dtrace_toxic_ranges\n"); 127 } 128 129 void 130 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 131 { 132 cpuset_t cpus; 133 134 if (cpu == DTRACE_CPUALL) 135 cpus = all_cpus; 136 else 137 CPU_SETOF(cpu, &cpus); 138 139 smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func, 140 smp_no_rendevous_barrier, arg); 141 } 142 143 static void 144 dtrace_sync_func(void) 145 { 146 } 147 148 void 149 dtrace_sync(void) 150 { 151 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 152 } 153 154 /* 155 * DTrace needs a high resolution time function which can 156 * be called from a probe context and guaranteed not to have 157 * instrumented with probes itself. 158 * 159 * Returns nanoseconds since boot. 160 */ 161 uint64_t 162 dtrace_gethrtime() 163 { 164 struct timespec curtime; 165 166 nanouptime(&curtime); 167 168 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 169 170 } 171 172 uint64_t 173 dtrace_gethrestime(void) 174 { 175 struct timespec current_time; 176 177 dtrace_getnanotime(¤t_time); 178 179 return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec); 180 } 181 182 /* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */ 183 int 184 dtrace_trap(struct trapframe *frame, u_int type) 185 { 186 /* 187 * A trap can occur while DTrace executes a probe. Before 188 * executing the probe, DTrace blocks re-scheduling and sets 189 * a flag in its per-cpu flags to indicate that it doesn't 190 * want to fault. On returning from the probe, the no-fault 191 * flag is cleared and finally re-scheduling is enabled. 192 * 193 * Check if DTrace has enabled 'no-fault' mode: 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 /* Page fault. */ 203 case FAULT_ALIGN: 204 /* Flag a bad address. */ 205 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 206 cpu_core[curcpu].cpuc_dtrace_illval = 0; 207 208 /* 209 * Offset the instruction pointer to the instruction 210 * following the one causing the fault. 211 */ 212 frame->tf_pc += sizeof(int); 213 return (1); 214 default: 215 /* Handle all other traps in the usual way. */ 216 break; 217 } 218 } 219 220 /* Handle the trap in the usual way. */ 221 return (0); 222 } 223 224 void 225 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 226 int fault, int fltoffs, uintptr_t illval) 227 { 228 229 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 230 (uintptr_t)epid, 231 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 232 } 233 234 static int 235 dtrace_invop_start(struct trapframe *frame) 236 { 237 register_t *r0, *sp; 238 int data, invop, reg, update_sp; 239 240 invop = dtrace_invop(frame->tf_pc, frame, frame->tf_pc); 241 switch (invop & DTRACE_INVOP_MASK) { 242 case DTRACE_INVOP_PUSHM: 243 sp = (register_t *)frame->tf_svc_sp; 244 r0 = &frame->tf_r0; 245 data = DTRACE_INVOP_DATA(invop); 246 247 /* 248 * Store the pc, lr, and sp. These have their own 249 * entries in the struct. 250 */ 251 if (data & (1 << BIT_PC)) { 252 sp--; 253 *sp = frame->tf_pc; 254 } 255 if (data & (1 << BIT_LR)) { 256 sp--; 257 *sp = frame->tf_svc_lr; 258 } 259 if (data & (1 << BIT_SP)) { 260 sp--; 261 *sp = frame->tf_svc_sp; 262 } 263 264 /* Store the general registers */ 265 for (reg = 12; reg >= 0; reg--) { 266 if (data & (1 << reg)) { 267 sp--; 268 *sp = r0[reg]; 269 } 270 } 271 272 /* Update the stack pointer and program counter to continue */ 273 frame->tf_svc_sp = (register_t)sp; 274 frame->tf_pc += 4; 275 break; 276 case DTRACE_INVOP_POPM: 277 sp = (register_t *)frame->tf_svc_sp; 278 r0 = &frame->tf_r0; 279 data = DTRACE_INVOP_DATA(invop); 280 281 /* Read the general registers */ 282 for (reg = 0; reg <= 12; reg++) { 283 if (data & (1 << reg)) { 284 r0[reg] = *sp; 285 sp++; 286 } 287 } 288 289 /* 290 * Set the stack pointer. If we don't update it here we will 291 * need to update it at the end as the instruction would do 292 */ 293 update_sp = 1; 294 if (data & (1 << BIT_SP)) { 295 frame->tf_svc_sp = *sp; 296 *sp++; 297 update_sp = 0; 298 } 299 300 /* Update the link register, we need to use the correct copy */ 301 if (data & (1 << BIT_LR)) { 302 frame->tf_svc_lr = *sp; 303 *sp++; 304 } 305 /* 306 * And the program counter. If it's not in the list skip over 307 * it when we return so to not hit this again. 308 */ 309 if (data & (1 << BIT_PC)) { 310 frame->tf_pc = *sp; 311 *sp++; 312 } else 313 frame->tf_pc += 4; 314 315 /* Update the stack pointer if we haven't already done so */ 316 if (update_sp) 317 frame->tf_svc_sp = (register_t)sp; 318 break; 319 case DTRACE_INVOP_B: 320 data = DTRACE_INVOP_DATA(invop) & 0x00ffffff; 321 /* Sign extend the data */ 322 if ((data & (1 << 23)) != 0) 323 data |= 0xff000000; 324 /* The data is the number of 4-byte words to change the pc */ 325 data *= 4; 326 data += 8; 327 frame->tf_pc += data; 328 break; 329 default: 330 return (-1); 331 break; 332 } 333 334 return (0); 335 } 336 337 void dtrace_invop_init(void) 338 { 339 dtrace_invop_jump_addr = dtrace_invop_start; 340 } 341 342 void dtrace_invop_uninit(void) 343 { 344 dtrace_invop_jump_addr = 0; 345 } 346