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 * Portions Copyright 2016-2018 Ruslan Bukin <br@bsdpad.com> 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/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/kmem.h> 37 #include <sys/proc.h> 38 #include <sys/smp.h> 39 #include <sys/dtrace_impl.h> 40 #include <sys/dtrace_bsd.h> 41 #include <cddl/dev/dtrace/dtrace_cddl.h> 42 #include <machine/vmparam.h> 43 #include <machine/encoding.h> 44 #include <machine/riscvreg.h> 45 #include <machine/clock.h> 46 #include <machine/frame.h> 47 #include <machine/trap.h> 48 #include <vm/pmap.h> 49 50 extern dtrace_id_t dtrace_probeid_error; 51 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 52 extern void dtrace_getnanotime(struct timespec *tsp); 53 extern void dtrace_getnanouptime(struct timespec *tsp); 54 55 int dtrace_invop(uintptr_t, struct trapframe *); 56 void dtrace_invop_init(void); 57 void dtrace_invop_uninit(void); 58 59 typedef struct dtrace_invop_hdlr { 60 int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t); 61 struct dtrace_invop_hdlr *dtih_next; 62 } dtrace_invop_hdlr_t; 63 64 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 65 66 int 67 dtrace_invop(uintptr_t addr, struct trapframe *frame) 68 { 69 struct thread *td; 70 dtrace_invop_hdlr_t *hdlr; 71 int rval; 72 73 rval = 0; 74 td = curthread; 75 td->t_dtrace_trapframe = frame; 76 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 77 if ((rval = hdlr->dtih_func(addr, frame, 0)) != 0) 78 break; 79 td->t_dtrace_trapframe = NULL; 80 return (rval); 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, *prev; 98 99 hdlr = dtrace_invop_hdlr; 100 prev = NULL; 101 102 for (;;) { 103 if (hdlr == NULL) 104 panic("attempt to remove non-existent invop handler"); 105 106 if (hdlr->dtih_func == func) 107 break; 108 109 prev = hdlr; 110 hdlr = hdlr->dtih_next; 111 } 112 113 if (prev == NULL) { 114 ASSERT(dtrace_invop_hdlr == hdlr); 115 dtrace_invop_hdlr = hdlr->dtih_next; 116 } else { 117 ASSERT(dtrace_invop_hdlr != hdlr); 118 prev->dtih_next = hdlr->dtih_next; 119 } 120 121 kmem_free(hdlr, 0); 122 } 123 124 /*ARGSUSED*/ 125 void 126 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 127 { 128 129 (*func)(0, (uintptr_t)VM_MIN_KERNEL_ADDRESS); 130 } 131 132 void 133 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 134 { 135 cpuset_t cpus; 136 137 if (cpu == DTRACE_CPUALL) 138 cpus = all_cpus; 139 else 140 CPU_SETOF(cpu, &cpus); 141 142 smp_rendezvous_cpus(cpus, smp_no_rendezvous_barrier, func, 143 smp_no_rendezvous_barrier, arg); 144 } 145 146 static void 147 dtrace_sync_func(void) 148 { 149 150 } 151 152 void 153 dtrace_sync(void) 154 { 155 156 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 157 } 158 159 /* 160 * DTrace needs a high resolution time function which can 161 * be called from a probe context and guaranteed not to have 162 * instrumented with probes itself. 163 * 164 * Returns nanoseconds since boot. 165 */ 166 uint64_t 167 dtrace_gethrtime(void) 168 { 169 struct timespec curtime; 170 171 dtrace_getnanouptime(&curtime); 172 173 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 174 175 } 176 177 uint64_t 178 dtrace_gethrestime(void) 179 { 180 struct timespec current_time; 181 182 dtrace_getnanotime(¤t_time); 183 184 return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec); 185 } 186 187 /* Function to handle DTrace traps during probes. See riscv/riscv/trap.c */ 188 int 189 dtrace_trap(struct trapframe *frame, u_int type) 190 { 191 /* 192 * A trap can occur while DTrace executes a probe. Before 193 * executing the probe, DTrace blocks re-scheduling and sets 194 * a flag in its per-cpu flags to indicate that it doesn't 195 * want to fault. On returning from the probe, the no-fault 196 * flag is cleared and finally re-scheduling is enabled. 197 * 198 * Check if DTrace has enabled 'no-fault' mode: 199 * 200 */ 201 202 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 203 /* 204 * There are only a couple of trap types that are expected. 205 * All the rest will be handled in the usual way. 206 */ 207 switch (type) { 208 case SCAUSE_LOAD_ACCESS_FAULT: 209 case SCAUSE_STORE_ACCESS_FAULT: 210 case SCAUSE_INST_ACCESS_FAULT: 211 /* Flag a bad address. */ 212 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 213 cpu_core[curcpu].cpuc_dtrace_illval = 0; 214 215 /* 216 * Offset the instruction pointer to the instruction 217 * following the one causing the fault. 218 */ 219 frame->tf_sepc += 4; 220 221 return (1); 222 default: 223 /* Handle all other traps in the usual way. */ 224 break; 225 } 226 } 227 228 /* Handle the trap in the usual way. */ 229 return (0); 230 } 231 232 void 233 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 234 int fault, int fltoffs, uintptr_t illval) 235 { 236 237 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 238 (uintptr_t)epid, 239 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 240 } 241 242 static int 243 match_opcode(uint32_t insn, int match, int mask) 244 { 245 246 if (((insn ^ match) & mask) == 0) 247 return (1); 248 249 return (0); 250 } 251 252 static int 253 dtrace_invop_start(struct trapframe *frame) 254 { 255 register_t *sp; 256 uint32_t uimm; 257 uint32_t imm; 258 int invop; 259 260 invop = dtrace_invop(frame->tf_sepc, frame); 261 if (invop == 0) 262 return (-1); 263 264 if (match_opcode(invop, (MATCH_SD | RS2_RA | RS1_SP), 265 (MASK_SD | RS2_MASK | RS1_MASK))) { 266 /* Non-compressed store of ra to sp */ 267 imm = (invop >> 7) & 0x1f; 268 imm |= ((invop >> 25) & 0x7f) << 5; 269 sp = (register_t *)((uint8_t *)frame->tf_sp + imm); 270 *sp = frame->tf_ra; 271 frame->tf_sepc += INSN_SIZE; 272 return (0); 273 } 274 275 if (match_opcode(invop, (MATCH_JALR | (X_RA << RS1_SHIFT)), 276 (MASK_JALR | RD_MASK | RS1_MASK | IMM_MASK))) { 277 /* Non-compressed ret */ 278 frame->tf_sepc = frame->tf_ra; 279 return (0); 280 } 281 282 if (match_opcode(invop, (MATCH_C_SDSP | RS2_C_RA), 283 (MASK_C_SDSP | RS2_C_MASK))) { 284 /* 'C'-compressed store of ra to sp */ 285 uimm = ((invop >> 10) & 0x7) << 3; 286 uimm |= ((invop >> 7) & 0x7) << 6; 287 sp = (register_t *)((uint8_t *)frame->tf_sp + uimm); 288 *sp = frame->tf_ra; 289 frame->tf_sepc += INSN_C_SIZE; 290 return (0); 291 } 292 293 if (match_opcode(invop, (MATCH_C_JR | (X_RA << RD_SHIFT)), 294 (MASK_C_JR | RD_MASK))) { 295 /* 'C'-compressed ret */ 296 frame->tf_sepc = frame->tf_ra; 297 return (0); 298 } 299 300 #ifdef INVARIANTS 301 panic("Instruction %x doesn't match any opcode.", invop); 302 #endif 303 304 return (-1); 305 } 306 307 void 308 dtrace_invop_init(void) 309 { 310 311 dtrace_invop_jump_addr = dtrace_invop_start; 312 } 313 314 void 315 dtrace_invop_uninit(void) 316 { 317 318 dtrace_invop_jump_addr = 0; 319 } 320