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/clock.h> 43#include <machine/frame.h> 44#include <machine/trap.h> 45#include <vm/pmap.h> 46 47#define DELAYBRANCH(x) ((int)(x) < 0) 48 49extern int (*dtrace_invop_jump_addr)(struct trapframe *); 50extern dtrace_id_t dtrace_probeid_error; 51 52int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t); 53void dtrace_invop_init(void); 54void dtrace_invop_uninit(void); 55 56typedef 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 61dtrace_invop_hdlr_t *dtrace_invop_hdlr; 62 63int 64dtrace_invop(uintptr_t addr, struct trapframe *stack, 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, stack, eax)) != 0) 71 return (rval); 72 73 return (0); 74} 75 76void 77dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 78{ 79 dtrace_invop_hdlr_t *hdlr; 80 81 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 82 hdlr->dtih_func = func; 83 hdlr->dtih_next = dtrace_invop_hdlr; 84 dtrace_invop_hdlr = hdlr; 85} 86 87void 88dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 89{ 90 dtrace_invop_hdlr_t *hdlr, *prev; 91 92 hdlr = dtrace_invop_hdlr; 93 prev = NULL; 94 95 for (;;) { 96 if (hdlr == NULL) 97 panic("attempt to remove non-existent invop handler"); 98 99 if (hdlr->dtih_func == func) 100 break; 101 102 prev = hdlr; 103 hdlr = hdlr->dtih_next; 104 } 105 106 if (prev == NULL) { 107 ASSERT(dtrace_invop_hdlr == hdlr); 108 dtrace_invop_hdlr = hdlr->dtih_next; 109 } else { 110 ASSERT(dtrace_invop_hdlr != hdlr); 111 prev->dtih_next = hdlr->dtih_next; 112 } 113 114 kmem_free(hdlr, 0); 115} 116 117/*ARGSUSED*/ 118void 119dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 120{ 121 /* 122 * No toxic regions? 123 */ 124} 125 126void 127dtrace_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_rendezvous_barrier, func, 137 smp_no_rendezvous_barrier, arg); 138} 139 140static void 141dtrace_sync_func(void) 142{ 143} 144 145void 146dtrace_sync(void) 147{ 148 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 149} 150 151/* 152 * DTrace needs a high resolution time function which can 153 * be called from a probe context and guaranteed not to have 154 * instrumented with probes itself. 155 * 156 * Returns nanoseconds since boot. 157 */ 158uint64_t 159dtrace_gethrtime() 160{ 161 struct timespec curtime; 162 163 nanouptime(&curtime); 164 165 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 166 167} 168 169uint64_t 170dtrace_gethrestime(void) 171{ 172 struct timespec curtime; 173 174 getnanotime(&curtime); 175 176 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 177} 178 179/* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */ 180int 181dtrace_trap(struct trapframe *frame, u_int type) 182{ 183 184 /* 185 * A trap can occur while DTrace executes a probe. Before 186 * executing the probe, DTrace blocks re-scheduling and sets 187 * a flag in its per-cpu flags to indicate that it doesn't 188 * want to fault. On returning from the probe, the no-fault 189 * flag is cleared and finally re-scheduling is enabled. 190 * 191 * Check if DTrace has enabled 'no-fault' mode: 192 */ 193 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 194 /* 195 * There are only a couple of trap types that are expected. 196 * All the rest will be handled in the usual way. 197 */ 198 switch (type) { 199 /* Page fault. */ 200 case T_TLB_ST_MISS: 201 case T_ADDR_ERR_ST: 202 case T_TLB_LD_MISS: 203 case T_ADDR_ERR_LD: 204 case T_BUS_ERR_IFETCH: 205 /* Flag a bad address. */ 206 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 207 cpu_core[curcpu].cpuc_dtrace_illval = frame->badvaddr; 208 209 /* 210 * Offset the instruction pointer to the instruction 211 * following the one causing the fault. 212 */ 213 if (DELAYBRANCH(frame->cause)) /* Check BD bit */ 214 { 215 /* XXX: check MipsEmulateBranch on MIPS64 216 frame->pc = MipsEmulateBranch(frame, frame->pc, 217 0, 0); 218 */ 219 panic("%s: delay slot at %jx, badvaddr = %jx\n", 220 __func__, 221 (intmax_t)frame->pc, (intmax_t)frame->badvaddr); 222 } 223 else 224 frame->pc += sizeof(int); 225 return (1); 226 default: 227 /* Handle all other traps in the usual way. */ 228 break; 229 } 230 } 231 232 /* Handle the trap in the usual way. */ 233 return (0); 234} 235 236void 237dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 238 int fault, int fltoffs, uintptr_t illval) 239{ 240 241 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 242 (uintptr_t)epid, 243 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 244} 245 246static int 247dtrace_invop_start(struct trapframe *frame) 248{ 249 register_t *sp; 250 int16_t offs; 251 int invop; 252 253 invop = dtrace_invop(frame->pc, frame, frame->pc); 254 if (invop == 0) 255 return (-1); 256 257 offs = (invop & LDSD_DATA_MASK); 258 sp = (register_t *)((uint8_t *)frame->sp + offs); 259 260 switch (invop & LDSD_RA_SP_MASK) { 261 case LD_RA_SP: 262 frame->ra = *sp; 263 frame->pc += INSN_SIZE; 264 break; 265 case SD_RA_SP: 266 *(sp) = frame->ra; 267 frame->pc += INSN_SIZE; 268 break; 269 default: 270 printf("%s: 0x%x undefined\n", __func__, invop); 271 return (-1); 272 }; 273 274 return (0); 275} 276 277void 278dtrace_invop_init(void) 279{ 280 281 dtrace_invop_jump_addr = dtrace_invop_start; 282} 283 284void 285dtrace_invop_uninit(void) 286{ 287 288 dtrace_invop_jump_addr = 0; 289} 290