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 49 extern uintptr_t dtrace_in_probe_addr; 50 extern int dtrace_in_probe; 51 extern dtrace_id_t dtrace_probeid_error; 52 53 int dtrace_invop(uintptr_t, uintptr_t *, uintptr_t); 54 55 typedef struct dtrace_invop_hdlr { 56 int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t); 57 struct dtrace_invop_hdlr *dtih_next; 58 } dtrace_invop_hdlr_t; 59 60 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 61 62 int 63 dtrace_invop(uintptr_t addr, uintptr_t *stack, uintptr_t eax) 64 { 65 dtrace_invop_hdlr_t *hdlr; 66 int rval; 67 68 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 69 if ((rval = hdlr->dtih_func(addr, stack, eax)) != 0) 70 return (rval); 71 72 return (0); 73 } 74 75 76 /*ARGSUSED*/ 77 void 78 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 79 { 80 /* 81 * No toxic regions? 82 */ 83 } 84 85 void 86 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 87 { 88 cpuset_t cpus; 89 90 if (cpu == DTRACE_CPUALL) 91 cpus = all_cpus; 92 else 93 CPU_SETOF(cpu, &cpus); 94 95 smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func, 96 smp_no_rendevous_barrier, arg); 97 } 98 99 static void 100 dtrace_sync_func(void) 101 { 102 } 103 104 void 105 dtrace_sync(void) 106 { 107 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 108 } 109 110 /* 111 * DTrace needs a high resolution time function which can 112 * be called from a probe context and guaranteed not to have 113 * instrumented with probes itself. 114 * 115 * Returns nanoseconds since boot. 116 */ 117 uint64_t 118 dtrace_gethrtime() 119 { 120 struct timespec curtime; 121 122 nanouptime(&curtime); 123 124 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 125 126 } 127 128 uint64_t 129 dtrace_gethrestime(void) 130 { 131 struct timespec curtime; 132 133 getnanotime(&curtime); 134 135 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 136 } 137 138 /* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */ 139 int 140 dtrace_trap(struct trapframe *frame, u_int type) 141 { 142 /* 143 * A trap can occur while DTrace executes a probe. Before 144 * executing the probe, DTrace blocks re-scheduling and sets 145 * a flag in it's per-cpu flags to indicate that it doesn't 146 * want to fault. On returning from the probe, the no-fault 147 * flag is cleared and finally re-scheduling is enabled. 148 * 149 * Check if DTrace has enabled 'no-fault' mode: 150 * 151 */ 152 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 153 /* 154 * There are only a couple of trap types that are expected. 155 * All the rest will be handled in the usual way. 156 */ 157 switch (type) { 158 /* Page fault. */ 159 case EXC_DSI: 160 case EXC_DSE: 161 /* Flag a bad address. */ 162 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 163 cpu_core[curcpu].cpuc_dtrace_illval = frame->cpu.aim.dar; 164 165 /* 166 * Offset the instruction pointer to the instruction 167 * following the one causing the fault. 168 */ 169 frame->srr0 += sizeof(int); 170 return (1); 171 case EXC_ISI: 172 case EXC_ISE: 173 /* Flag a bad address. */ 174 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 175 cpu_core[curcpu].cpuc_dtrace_illval = frame->srr0; 176 177 /* 178 * Offset the instruction pointer to the instruction 179 * following the one causing the fault. 180 */ 181 frame->srr0 += sizeof(int); 182 return (1); 183 default: 184 /* Handle all other traps in the usual way. */ 185 break; 186 } 187 } 188 189 /* Handle the trap in the usual way. */ 190 return (0); 191 } 192 193 void 194 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 195 int fault, int fltoffs, uintptr_t illval) 196 { 197 198 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 199 (uintptr_t)epid, 200 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 201 } 202