6c2806594b
Currently this argument is a pointer into the stack which is used by FBT to fetch the first five probe arguments. On all non-x86 architectures it's simply the trapframe address, so this change has no functional impact. On amd64 it's a pointer into the trapframe such that stack[1 .. 5] gives the first five argument registers, which are deliberately grouped together in the amd64 trapframe definition. A trapframe argument simplifies the invop handlers on !x86 and makes the x86 FBT invop handler easier to understand. Moreover, it allows for invop handlers that may want to modify the register set of the interrupted thread.
202 lines
4.7 KiB
C
202 lines
4.7 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License, Version 1.0 only
|
|
* (the "License"). You may not use this file except in compliance
|
|
* with the License.
|
|
*
|
|
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
* or http://www.opensolaris.org/os/licensing.
|
|
* See the License for the specific language governing permissions
|
|
* and limitations under the License.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
* If applicable, add the following below this CDDL HEADER, with the
|
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
|
* information: Portions Copyright [yyyy] [name of copyright owner]
|
|
*
|
|
* CDDL HEADER END
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
/*
|
|
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
|
|
* Use is subject to license terms.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/types.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/dtrace_impl.h>
|
|
#include <sys/dtrace_bsd.h>
|
|
#include <machine/clock.h>
|
|
#include <machine/frame.h>
|
|
#include <machine/trap.h>
|
|
#include <vm/pmap.h>
|
|
|
|
#define DELAYBRANCH(x) ((int)(x) < 0)
|
|
|
|
extern dtrace_id_t dtrace_probeid_error;
|
|
|
|
int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t);
|
|
|
|
typedef struct dtrace_invop_hdlr {
|
|
int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t);
|
|
struct dtrace_invop_hdlr *dtih_next;
|
|
} dtrace_invop_hdlr_t;
|
|
|
|
dtrace_invop_hdlr_t *dtrace_invop_hdlr;
|
|
|
|
int
|
|
dtrace_invop(uintptr_t addr, struct trapframe *stack, uintptr_t eax)
|
|
{
|
|
dtrace_invop_hdlr_t *hdlr;
|
|
int rval;
|
|
|
|
for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next)
|
|
if ((rval = hdlr->dtih_func(addr, stack, eax)) != 0)
|
|
return (rval);
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
|
|
{
|
|
/*
|
|
* No toxic regions?
|
|
*/
|
|
}
|
|
|
|
void
|
|
dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg)
|
|
{
|
|
cpuset_t cpus;
|
|
|
|
if (cpu == DTRACE_CPUALL)
|
|
cpus = all_cpus;
|
|
else
|
|
CPU_SETOF(cpu, &cpus);
|
|
|
|
smp_rendezvous_cpus(cpus, smp_no_rendevous_barrier, func,
|
|
smp_no_rendevous_barrier, arg);
|
|
}
|
|
|
|
static void
|
|
dtrace_sync_func(void)
|
|
{
|
|
}
|
|
|
|
void
|
|
dtrace_sync(void)
|
|
{
|
|
dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);
|
|
}
|
|
|
|
/*
|
|
* DTrace needs a high resolution time function which can
|
|
* be called from a probe context and guaranteed not to have
|
|
* instrumented with probes itself.
|
|
*
|
|
* Returns nanoseconds since boot.
|
|
*/
|
|
uint64_t
|
|
dtrace_gethrtime()
|
|
{
|
|
struct timespec curtime;
|
|
|
|
nanouptime(&curtime);
|
|
|
|
return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
|
|
|
|
}
|
|
|
|
uint64_t
|
|
dtrace_gethrestime(void)
|
|
{
|
|
struct timespec curtime;
|
|
|
|
getnanotime(&curtime);
|
|
|
|
return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
|
|
}
|
|
|
|
/* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */
|
|
int
|
|
dtrace_trap(struct trapframe *frame, u_int type)
|
|
{
|
|
|
|
/*
|
|
* A trap can occur while DTrace executes a probe. Before
|
|
* executing the probe, DTrace blocks re-scheduling and sets
|
|
* a flag in its per-cpu flags to indicate that it doesn't
|
|
* want to fault. On returning from the probe, the no-fault
|
|
* flag is cleared and finally re-scheduling is enabled.
|
|
*
|
|
* Check if DTrace has enabled 'no-fault' mode:
|
|
*/
|
|
if ((cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT) != 0) {
|
|
/*
|
|
* There are only a couple of trap types that are expected.
|
|
* All the rest will be handled in the usual way.
|
|
*/
|
|
switch (type) {
|
|
/* Page fault. */
|
|
case T_TLB_ST_MISS:
|
|
case T_ADDR_ERR_ST:
|
|
case T_TLB_LD_MISS:
|
|
case T_ADDR_ERR_LD:
|
|
case T_BUS_ERR_IFETCH:
|
|
/* Flag a bad address. */
|
|
cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
|
|
cpu_core[curcpu].cpuc_dtrace_illval = frame->badvaddr;
|
|
|
|
/*
|
|
* Offset the instruction pointer to the instruction
|
|
* following the one causing the fault.
|
|
*/
|
|
if (DELAYBRANCH(frame->cause)) /* Check BD bit */
|
|
{
|
|
/* XXX: check MipsEmulateBranch on MIPS64
|
|
frame->pc = MipsEmulateBranch(frame, frame->pc,
|
|
0, 0);
|
|
*/
|
|
panic("%s: delay slot at %jx, badvaddr = %jx\n",
|
|
__func__,
|
|
(intmax_t)frame->pc, (intmax_t)frame->badvaddr);
|
|
}
|
|
else
|
|
frame->pc += sizeof(int);
|
|
return (1);
|
|
default:
|
|
/* Handle all other traps in the usual way. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Handle the trap in the usual way. */
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which,
|
|
int fault, int fltoffs, uintptr_t illval)
|
|
{
|
|
|
|
dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state,
|
|
(uintptr_t)epid,
|
|
(uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs);
|
|
}
|