2012-03-24 05:14:37 +00:00
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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* $FreeBSD$
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*
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*/
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/*
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* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/kmem.h>
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#include <sys/smp.h>
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#include <sys/dtrace_impl.h>
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#include <sys/dtrace_bsd.h>
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#include <machine/clock.h>
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#include <machine/frame.h>
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#include <machine/trap.h>
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#include <vm/pmap.h>
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#define DELAYBRANCH(x) ((int)(x) < 0)
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extern dtrace_id_t dtrace_probeid_error;
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2016-04-17 23:08:47 +00:00
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int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t);
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2012-03-24 05:14:37 +00:00
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typedef struct dtrace_invop_hdlr {
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int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t);
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struct dtrace_invop_hdlr *dtih_next;
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} dtrace_invop_hdlr_t;
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dtrace_invop_hdlr_t *dtrace_invop_hdlr;
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int
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2016-04-17 23:08:47 +00:00
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dtrace_invop(uintptr_t addr, struct trapframe *stack, uintptr_t eax)
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2012-03-24 05:14:37 +00:00
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{
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dtrace_invop_hdlr_t *hdlr;
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int rval;
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for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next)
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if ((rval = hdlr->dtih_func(addr, stack, eax)) != 0)
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return (rval);
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return (0);
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}
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/*ARGSUSED*/
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void
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dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
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{
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/*
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* No toxic regions?
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*/
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}
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void
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dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg)
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{
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cpuset_t cpus;
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if (cpu == DTRACE_CPUALL)
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cpus = all_cpus;
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else
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CPU_SETOF(cpu, &cpus);
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smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func,
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smp_no_rendevous_barrier, arg);
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}
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static void
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dtrace_sync_func(void)
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{
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}
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void
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dtrace_sync(void)
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{
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dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);
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}
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/*
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* DTrace needs a high resolution time function which can
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* be called from a probe context and guaranteed not to have
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* instrumented with probes itself.
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*
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* Returns nanoseconds since boot.
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*/
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uint64_t
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dtrace_gethrtime()
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{
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struct timespec curtime;
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nanouptime(&curtime);
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return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
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}
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uint64_t
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dtrace_gethrestime(void)
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{
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struct timespec curtime;
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getnanotime(&curtime);
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return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
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}
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/* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */
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int
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2014-12-23 15:38:19 +00:00
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dtrace_trap(struct trapframe *frame, u_int type)
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2012-03-24 05:14:37 +00:00
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{
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2014-07-14 04:38:17 +00:00
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2012-03-24 05:14:37 +00:00
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/*
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* A trap can occur while DTrace executes a probe. Before
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* executing the probe, DTrace blocks re-scheduling and sets
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2014-07-14 04:38:17 +00:00
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* a flag in its per-cpu flags to indicate that it doesn't
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2012-03-24 05:14:37 +00:00
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* want to fault. On returning from the probe, the no-fault
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* flag is cleared and finally re-scheduling is enabled.
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*
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* Check if DTrace has enabled 'no-fault' mode:
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*/
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if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) {
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/*
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* There are only a couple of trap types that are expected.
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* All the rest will be handled in the usual way.
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*/
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switch (type) {
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/* Page fault. */
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case T_TLB_ST_MISS:
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case T_ADDR_ERR_ST:
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case T_TLB_LD_MISS:
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case T_ADDR_ERR_LD:
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case T_BUS_ERR_IFETCH:
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/* Flag a bad address. */
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cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
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cpu_core[curcpu].cpuc_dtrace_illval = frame->badvaddr;
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/*
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* Offset the instruction pointer to the instruction
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* following the one causing the fault.
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*/
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if (DELAYBRANCH(frame->cause)) /* Check BD bit */
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{
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/* XXX: check MipsEmulateBranch on MIPS64
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frame->pc = MipsEmulateBranch(frame, frame->pc,
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0, 0);
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*/
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panic("%s: delay slot at %jx, badvaddr = %jx\n",
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__func__,
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(intmax_t)frame->pc, (intmax_t)frame->badvaddr);
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}
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else
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frame->pc += sizeof(int);
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return (1);
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default:
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/* Handle all other traps in the usual way. */
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break;
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}
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}
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/* Handle the trap in the usual way. */
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return (0);
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}
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void
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dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which,
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int fault, int fltoffs, uintptr_t illval)
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{
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dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state,
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(uintptr_t)epid,
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(uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs);
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}
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