1 /* $NetBSD: dtrace_subr.c,v 1.3 2017/02/27 06:47:00 chs Exp $ */ 2 3 /* 4 * CDDL HEADER START 5 * 6 * The contents of this file are subject to the terms of the 7 * Common Development and Distribution License, Version 1.0 only 8 * (the "License"). You may not use this file except in compliance 9 * with the License. 10 * 11 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 12 * or http://www.opensolaris.org/os/licensing. 13 * See the License for the specific language governing permissions 14 * and limitations under the License. 15 * 16 * When distributing Covered Code, include this CDDL HEADER in each 17 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 18 * If applicable, add the following below this CDDL HEADER, with the 19 * fields enclosed by brackets "[]" replaced with your own identifying 20 * information: Portions Copyright [yyyy] [name of copyright owner] 21 * 22 * CDDL HEADER END 23 * 24 * $FreeBSD$ 25 * 26 */ 27 /* 28 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 29 * Use is subject to license terms. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/types.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/kmem.h> 38 #include <sys/xcall.h> 39 #include <sys/cpu.h> 40 #include <sys/cpuvar.h> 41 #include <sys/dtrace_impl.h> 42 #include <sys/dtrace_bsd.h> 43 #include <machine/cpu.h> 44 #include <machine/frame.h> 45 #include <machine/vmparam.h> 46 #include <uvm/uvm_pglist.h> 47 #include <uvm/uvm_prot.h> 48 #include <uvm/uvm_pmap.h> 49 50 extern uintptr_t kernelbase; 51 extern uintptr_t dtrace_in_probe_addr; 52 extern int dtrace_in_probe; 53 extern dtrace_id_t dtrace_probeid_error; 54 55 int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t); 56 57 typedef struct dtrace_invop_hdlr { 58 int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t); 59 struct dtrace_invop_hdlr *dtih_next; 60 } dtrace_invop_hdlr_t; 61 62 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 63 64 void dtrace_gethrtime_init(void *arg); 65 66 int 67 dtrace_invop(uintptr_t addr, struct trapframe *frame, uintptr_t eax) 68 { 69 dtrace_invop_hdlr_t *hdlr; 70 int rval; 71 72 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 73 if ((rval = hdlr->dtih_func(addr, frame, eax)) != 0) 74 return (rval); 75 76 return (0); 77 } 78 79 void 80 dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 81 { 82 dtrace_invop_hdlr_t *hdlr; 83 84 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 85 hdlr->dtih_func = func; 86 hdlr->dtih_next = dtrace_invop_hdlr; 87 dtrace_invop_hdlr = hdlr; 88 } 89 90 void 91 dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 92 { 93 dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *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, sizeof (dtrace_invop_hdlr_t)); 115 } 116 117 void 118 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 119 { 120 (*func)(0, kernelbase); 121 } 122 123 static void 124 xcall_func(void *arg0, void *arg1) 125 { 126 dtrace_xcall_t func = arg0; 127 128 (*func)(arg1); 129 } 130 131 void 132 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 133 { 134 uint64_t where; 135 136 if (cpu == DTRACE_CPUALL) { 137 where = xc_broadcast(0, xcall_func, func, arg); 138 } else { 139 struct cpu_info *cinfo = cpu_lookup(cpu); 140 141 KASSERT(cinfo != NULL); 142 where = xc_unicast(0, xcall_func, func, arg, cinfo); 143 } 144 xc_wait(where); 145 146 /* XXX Q. Do we really need the other cpus to wait also? 147 * (see solaris:xc_sync()) 148 */ 149 } 150 151 static void 152 dtrace_sync_func(void) 153 { 154 } 155 156 void 157 dtrace_sync(void) 158 { 159 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 160 } 161 162 /* 163 * DTrace needs a high resolution time function which can 164 * be called from a probe context and guaranteed not to have 165 * instrumented with probes itself. 166 * 167 * Returns nanoseconds since boot. 168 */ 169 uint64_t 170 dtrace_gethrtime() 171 { 172 struct timespec curtime; 173 174 nanouptime(&curtime); 175 176 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 177 178 } 179 180 uint64_t 181 dtrace_gethrestime(void) 182 { 183 struct timespec curtime; 184 185 getnanotime(&curtime); 186 187 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 188 } 189 190 /* Function to handle DTrace traps during probes. Not used on ARM yet */ 191 int 192 dtrace_trap(struct trapframe *frame, u_int type) 193 { 194 cpuid_t cpuid = cpu_number(); /* current cpu id */ 195 196 /* 197 * A trap can occur while DTrace executes a probe. Before 198 * executing the probe, DTrace blocks re-scheduling and sets 199 * a flag in it's per-cpu flags to indicate that it doesn't 200 * want to fault. On returning from the probe, the no-fault 201 * flag is cleared and finally re-scheduling is enabled. 202 * 203 * Check if DTrace has enabled 'no-fault' mode: 204 * 205 */ 206 207 if ((cpu_core[cpuid].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 208 /* 209 * There are only a couple of trap types that are expected. 210 * All the rest will be handled in the usual way. 211 */ 212 switch (type) { 213 /* Page fault. */ 214 case 0: 215 /* Flag a bad address. */ 216 cpu_core[cpuid].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 217 cpu_core[cpuid].cpuc_dtrace_illval = 0; 218 219 /* 220 * Offset the instruction pointer to the instruction 221 * following the one causing the fault. 222 */ 223 panic("%s", __func__); 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 } 235 236 void 237 dtrace_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 } 245 246 void 247 dtrace_gethrtime_init(void *arg) 248 { 249 /* FIXME */ 250 } 251