dtrace_subr.c revision 328386
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 Ruslan Bukin <br@bsdpad.com> 23 * 24 * $FreeBSD: stable/11/sys/cddl/dev/dtrace/riscv/dtrace_subr.c 328386 2018-01-25 02:45:21Z pkelsey $ 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: stable/11/sys/cddl/dev/dtrace/riscv/dtrace_subr.c 328386 2018-01-25 02:45:21Z pkelsey $"); 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/riscvreg.h> 46#include <machine/riscv_opcode.h> 47#include <machine/clock.h> 48#include <machine/frame.h> 49#include <machine/trap.h> 50#include <vm/pmap.h> 51 52extern dtrace_id_t dtrace_probeid_error; 53extern int (*dtrace_invop_jump_addr)(struct trapframe *); 54extern void dtrace_getnanotime(struct timespec *tsp); 55 56int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t); 57void dtrace_invop_init(void); 58void dtrace_invop_uninit(void); 59 60typedef struct dtrace_invop_hdlr { 61 int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t); 62 struct dtrace_invop_hdlr *dtih_next; 63} dtrace_invop_hdlr_t; 64 65dtrace_invop_hdlr_t *dtrace_invop_hdlr; 66 67int 68dtrace_invop(uintptr_t addr, struct trapframe *frame, uintptr_t eax) 69{ 70 dtrace_invop_hdlr_t *hdlr; 71 int rval; 72 73 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next) 74 if ((rval = hdlr->dtih_func(addr, frame, eax)) != 0) 75 return (rval); 76 77 return (0); 78} 79 80 81void 82dtrace_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 92void 93dtrace_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*/ 123void 124dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit)) 125{ 126 127 (*func)(0, (uintptr_t)VM_MIN_KERNEL_ADDRESS); 128} 129 130void 131dtrace_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 144static void 145dtrace_sync_func(void) 146{ 147 148} 149 150void 151dtrace_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 */ 164uint64_t 165dtrace_gethrtime() 166{ 167 struct timespec curtime; 168 169 nanouptime(&curtime); 170 171 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec); 172 173} 174 175uint64_t 176dtrace_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 */ 186int 187dtrace_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 it's 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 EXCP_LOAD_ACCESS_FAULT: 207 case EXCP_STORE_ACCESS_FAULT: 208 case EXCP_INSTR_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 230void 231dtrace_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 240static int 241dtrace_invop_start(struct trapframe *frame) 242{ 243 int data, invop, reg, update_sp; 244 register_t arg1, arg2; 245 register_t *sp; 246 uint32_t imm; 247 InstFmt i; 248 int offs; 249 int tmp; 250 251 invop = dtrace_invop(frame->tf_sepc, frame, frame->tf_sepc); 252 253 if (invop == RISCV_INSN_RET) { 254 frame->tf_sepc = frame->tf_ra; 255 return (0); 256 } 257 258 if ((invop & SD_RA_SP_MASK) == SD_RA_SP) { 259 i.word = invop; 260 imm = i.SType.imm0_4 | (i.SType.imm5_11 << 5); 261 sp = (register_t *)((uint8_t *)frame->tf_sp + imm); 262 *sp = frame->tf_ra; 263 frame->tf_sepc += INSN_SIZE; 264 return (0); 265 } 266 267 return (-1); 268} 269 270void 271dtrace_invop_init(void) 272{ 273 274 dtrace_invop_jump_addr = dtrace_invop_start; 275} 276 277void 278dtrace_invop_uninit(void) 279{ 280 281 dtrace_invop_jump_addr = 0; 282} 283