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 printf("IMPLEMENT ME: dtrace_toxic_ranges\n"); 81 } 82 83 void 84 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 85 { 86 cpuset_t cpus; 87 88 if (cpu == DTRACE_CPUALL) 89 cpus = all_cpus; 90 else 91 CPU_SETOF(cpu, &cpus); 92 93 smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func, 94 smp_no_rendevous_barrier, arg); 95 } 96 97 static void 98 dtrace_sync_func(void) 99 { 100 } 101 102 void 103 dtrace_sync(void) 104 { 105 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 106 } 107 108 /* 109 * DTrace needs a high resolution time function which can 110 * be called from a probe context and guaranteed not to have 111 * instrumented with probes itself. 112 * 113 * Returns nanoseconds since boot. 114 */ 115 uint64_t 116 dtrace_gethrtime() 117 { 118 struct timespec curtime; 119 120 nanouptime(&curtime); 121 122 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 123 124 } 125 126 uint64_t 127 dtrace_gethrestime(void) 128 { 129 struct timespec curtime; 130 131 getnanotime(&curtime); 132 133 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 134 } 135 136 /* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */ 137 int 138 dtrace_trap(struct trapframe *frame, u_int type) 139 { 140 /* 141 * A trap can occur while DTrace executes a probe. Before 142 * executing the probe, DTrace blocks re-scheduling and sets 143 * a flag in it's per-cpu flags to indicate that it doesn't 144 * want to fault. On returning from the probe, the no-fault 145 * flag is cleared and finally re-scheduling is enabled. 146 * 147 * Check if DTrace has enabled 'no-fault' mode: 148 * 149 */ 150 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 151 /* 152 * There are only a couple of trap types that are expected. 153 * All the rest will be handled in the usual way. 154 */ 155 switch (type) { 156 /* Page fault. */ 157 case 0: 158 /* Flag a bad address. */ 159 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 160 cpu_core[curcpu].cpuc_dtrace_illval = 0; 161 162 /* 163 * Offset the instruction pointer to the instruction 164 * following the one causing the fault. 165 */ 166 panic("%s", __func__); 167 // frame->pc += sizeof(int); 168 return (1); 169 default: 170 /* Handle all other traps in the usual way. */ 171 break; 172 } 173 } 174 175 /* Handle the trap in the usual way. */ 176 return (0); 177 } 178 179 void 180 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 181 int fault, int fltoffs, uintptr_t illval) 182 { 183 184 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 185 (uintptr_t)epid, 186 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 187 } 188