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/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/types.h> 38 #include <sys/kernel.h> 39 #include <sys/malloc.h> 40 #include <sys/kmem.h> 41 #include <sys/smp.h> 42 #include <sys/dtrace_impl.h> 43 #include <sys/dtrace_bsd.h> 44 #include <machine/vmparam.h> 45 #include <machine/encoding.h> 46 #include <machine/riscvreg.h> 47 #include <machine/clock.h> 48 #include <machine/frame.h> 49 #include <machine/trap.h> 50 #include <vm/pmap.h> 51 52 extern dtrace_id_t dtrace_probeid_error; 53 extern int (*dtrace_invop_jump_addr)(struct trapframe *); 54 extern void dtrace_getnanotime(struct timespec *tsp); 55 extern void dtrace_getnanouptime(struct timespec *tsp); 56 57 int dtrace_invop(uintptr_t, struct trapframe *); 58 void dtrace_invop_init(void); 59 void dtrace_invop_uninit(void); 60 61 typedef struct dtrace_invop_hdlr { 62 int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t); 63 struct dtrace_invop_hdlr *dtih_next; 64 } dtrace_invop_hdlr_t; 65 66 dtrace_invop_hdlr_t *dtrace_invop_hdlr; 67 68 int 69 dtrace_invop(uintptr_t addr, struct trapframe *frame) 70 { 71 dtrace_invop_hdlr_t *hdlr; 72 int rval; 73 74 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 75 if ((rval = hdlr->dtih_func(addr, frame, 0)) != 0) 76 return (rval); 77 78 return (0); 79 } 80 81 void 82 dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 83 { 84 dtrace_invop_hdlr_t *hdlr; 85 86 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP); 87 hdlr->dtih_func = func; 88 hdlr->dtih_next = dtrace_invop_hdlr; 89 dtrace_invop_hdlr = hdlr; 90 } 91 92 void 93 dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t)) 94 { 95 dtrace_invop_hdlr_t *hdlr, *prev; 96 97 hdlr = dtrace_invop_hdlr; 98 prev = NULL; 99 100 for (;;) { 101 if (hdlr == NULL) 102 panic("attempt to remove non-existent invop handler"); 103 104 if (hdlr->dtih_func == func) 105 break; 106 107 prev = hdlr; 108 hdlr = hdlr->dtih_next; 109 } 110 111 if (prev == NULL) { 112 ASSERT(dtrace_invop_hdlr == hdlr); 113 dtrace_invop_hdlr = hdlr->dtih_next; 114 } else { 115 ASSERT(dtrace_invop_hdlr != hdlr); 116 prev->dtih_next = hdlr->dtih_next; 117 } 118 119 kmem_free(hdlr, 0); 120 } 121 122 /*ARGSUSED*/ 123 void 124 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 125 { 126 127 (*func)(0, (uintptr_t)VM_MIN_KERNEL_ADDRESS); 128 } 129 130 void 131 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg) 132 { 133 cpuset_t cpus; 134 135 if (cpu == DTRACE_CPUALL) 136 cpus = all_cpus; 137 else 138 CPU_SETOF(cpu, &cpus); 139 140 smp_rendezvous_cpus(cpus, smp_no_rendezvous_barrier, func, 141 smp_no_rendezvous_barrier, arg); 142 } 143 144 static void 145 dtrace_sync_func(void) 146 { 147 148 } 149 150 void 151 dtrace_sync(void) 152 { 153 154 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL); 155 } 156 157 /* 158 * DTrace needs a high resolution time function which can 159 * be called from a probe context and guaranteed not to have 160 * instrumented with probes itself. 161 * 162 * Returns nanoseconds since boot. 163 */ 164 uint64_t 165 dtrace_gethrtime() 166 { 167 struct timespec curtime; 168 169 dtrace_getnanouptime(&curtime); 170 171 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 172 173 } 174 175 uint64_t 176 dtrace_gethrestime(void) 177 { 178 struct timespec current_time; 179 180 dtrace_getnanotime(¤t_time); 181 182 return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec); 183 } 184 185 /* Function to handle DTrace traps during probes. See riscv/riscv/trap.c */ 186 int 187 dtrace_trap(struct trapframe *frame, u_int type) 188 { 189 /* 190 * A trap can occur while DTrace executes a probe. Before 191 * executing the probe, DTrace blocks re-scheduling and sets 192 * a flag in its per-cpu flags to indicate that it doesn't 193 * want to fault. On returning from the probe, the no-fault 194 * flag is cleared and finally re-scheduling is enabled. 195 * 196 * Check if DTrace has enabled 'no-fault' mode: 197 * 198 */ 199 200 if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) { 201 /* 202 * There are only a couple of trap types that are expected. 203 * All the rest will be handled in the usual way. 204 */ 205 switch (type) { 206 case SCAUSE_LOAD_ACCESS_FAULT: 207 case SCAUSE_STORE_ACCESS_FAULT: 208 case SCAUSE_INST_ACCESS_FAULT: 209 /* Flag a bad address. */ 210 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; 211 cpu_core[curcpu].cpuc_dtrace_illval = 0; 212 213 /* 214 * Offset the instruction pointer to the instruction 215 * following the one causing the fault. 216 */ 217 frame->tf_sepc += 4; 218 219 return (1); 220 default: 221 /* Handle all other traps in the usual way. */ 222 break; 223 } 224 } 225 226 /* Handle the trap in the usual way. */ 227 return (0); 228 } 229 230 void 231 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which, 232 int fault, int fltoffs, uintptr_t illval) 233 { 234 235 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state, 236 (uintptr_t)epid, 237 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs); 238 } 239 240 static int 241 match_opcode(uint32_t insn, int match, int mask) 242 { 243 244 if (((insn ^ match) & mask) == 0) 245 return (1); 246 247 return (0); 248 } 249 250 static int 251 dtrace_invop_start(struct trapframe *frame) 252 { 253 register_t *sp; 254 uint32_t uimm; 255 uint32_t imm; 256 int invop; 257 258 invop = dtrace_invop(frame->tf_sepc, frame); 259 if (invop == 0) 260 return (-1); 261 262 if (match_opcode(invop, (MATCH_SD | RS2_RA | RS1_SP), 263 (MASK_SD | RS2_MASK | RS1_MASK))) { 264 /* Non-compressed store of ra to sp */ 265 imm = (invop >> 7) & 0x1f; 266 imm |= ((invop >> 25) & 0x7f) << 5; 267 sp = (register_t *)((uint8_t *)frame->tf_sp + imm); 268 *sp = frame->tf_ra; 269 frame->tf_sepc += INSN_SIZE; 270 return (0); 271 } 272 273 if (match_opcode(invop, (MATCH_JALR | (X_RA << RS1_SHIFT)), 274 (MASK_JALR | RD_MASK | RS1_MASK | IMM_MASK))) { 275 /* Non-compressed ret */ 276 frame->tf_sepc = frame->tf_ra; 277 return (0); 278 } 279 280 if (match_opcode(invop, (MATCH_C_SDSP | RS2_C_RA), 281 (MASK_C_SDSP | RS2_C_MASK))) { 282 /* 'C'-compressed store of ra to sp */ 283 uimm = ((invop >> 10) & 0x7) << 3; 284 uimm |= ((invop >> 7) & 0x7) << 6; 285 sp = (register_t *)((uint8_t *)frame->tf_sp + uimm); 286 *sp = frame->tf_ra; 287 frame->tf_sepc += INSN_C_SIZE; 288 return (0); 289 } 290 291 if (match_opcode(invop, (MATCH_C_JR | (X_RA << RD_SHIFT)), 292 (MASK_C_JR | RD_MASK))) { 293 /* 'C'-compressed ret */ 294 frame->tf_sepc = frame->tf_ra; 295 return (0); 296 } 297 298 #ifdef INVARIANTS 299 panic("Instruction %x doesn't match any opcode.", invop); 300 #endif 301 302 return (-1); 303 } 304 305 void 306 dtrace_invop_init(void) 307 { 308 309 dtrace_invop_jump_addr = dtrace_invop_start; 310 } 311 312 void 313 dtrace_invop_uninit(void) 314 { 315 316 dtrace_invop_jump_addr = 0; 317 } 318