/*
* 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/armreg.h>
#include <machine/clock.h>
#include <machine/frame.h>
#include <machine/trap.h>
#include <vm/pmap.h>
#define DELAYBRANCH(x) ((int)(x) < 0)
#define BIT_PC 15
#define BIT_LR 14
#define BIT_SP 13
extern dtrace_id_t dtrace_probeid_error;
extern int (*dtrace_invop_jump_addr)(struct trapframe *);
extern void dtrace_getnanotime(struct timespec *tsp);
int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t);
void dtrace_invop_init(void);
void dtrace_invop_uninit(void);
typedef struct dtrace_invop_hdlr {
int (*dtih_func)(uintptr_t, struct trapframe *, 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 *frame, 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, frame, eax)) != 0)
return (rval);
return (0);
}
void
dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t))
{
dtrace_invop_hdlr_t *hdlr;
hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP);
hdlr->dtih_func = func;
hdlr->dtih_next = dtrace_invop_hdlr;
dtrace_invop_hdlr = hdlr;
}
void
dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t))
{
dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *prev = NULL;
for (;;) {
if (hdlr == NULL)
panic("attempt to remove non-existent invop handler");
if (hdlr->dtih_func == func)
break;
prev = hdlr;
hdlr = hdlr->dtih_next;
}
if (prev == NULL) {
ASSERT(dtrace_invop_hdlr == hdlr);
dtrace_invop_hdlr = hdlr->dtih_next;
} else {
ASSERT(dtrace_invop_hdlr != hdlr);
prev->dtih_next = hdlr->dtih_next;
}
kmem_free(hdlr, 0);
}
/*ARGSUSED*/
void
dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
{
/*
* There are no ranges to exclude that are common to all 32-bit arm
* platforms. This function only needs to exclude ranges "... in
* which it is impossible to recover from such a load after it has been
* attempted." -- i.e., accessing within the range causes some sort
* fault in the system which is not handled by the normal arm
* exception-handling mechanisms. If systems exist where that is the
* case, a method to handle this functionality would have to be added to
* the platform_if interface so that those systems could provide their
* specific toxic range(s).
*/
}
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_rendezvous_barrier, func,
smp_no_rendezvous_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 current_time;
dtrace_getnanotime(¤t_time);
return (current_time.tv_sec * 1000000000UL + current_time.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 FAULT_ALIGN:
/* Flag a bad address. */
cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
cpu_core[curcpu].cpuc_dtrace_illval = 0;
/*
* Offset the instruction pointer to the instruction
* following the one causing the fault.
*/
frame->tf_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);
}
static int
dtrace_invop_start(struct trapframe *frame)
{
register_t *r0, *sp;
int data, invop, reg, update_sp;
invop = dtrace_invop(frame->tf_pc, frame, frame->tf_r0);
switch (invop & DTRACE_INVOP_MASK) {
case DTRACE_INVOP_PUSHM:
sp = (register_t *)frame->tf_svc_sp;
r0 = &frame->tf_r0;
data = DTRACE_INVOP_DATA(invop);
/*
* Store the pc, lr, and sp. These have their own
* entries in the struct.
*/
if (data & (1 << BIT_PC)) {
sp--;
*sp = frame->tf_pc;
}
if (data & (1 << BIT_LR)) {
sp--;
*sp = frame->tf_svc_lr;
}
if (data & (1 << BIT_SP)) {
sp--;
*sp = frame->tf_svc_sp;
}
/* Store the general registers */
for (reg = 12; reg >= 0; reg--) {
if (data & (1 << reg)) {
sp--;
*sp = r0[reg];
}
}
/* Update the stack pointer and program counter to continue */
frame->tf_svc_sp = (register_t)sp;
frame->tf_pc += 4;
break;
case DTRACE_INVOP_POPM:
sp = (register_t *)frame->tf_svc_sp;
r0 = &frame->tf_r0;
data = DTRACE_INVOP_DATA(invop);
/* Read the general registers */
for (reg = 0; reg <= 12; reg++) {
if (data & (1 << reg)) {
r0[reg] = *sp;
sp++;
}
}
/*
* Set the stack pointer. If we don't update it here we will
* need to update it at the end as the instruction would do
*/
update_sp = 1;
if (data & (1 << BIT_SP)) {
frame->tf_svc_sp = *sp;
*sp++;
update_sp = 0;
}
/* Update the link register, we need to use the correct copy */
if (data & (1 << BIT_LR)) {
frame->tf_svc_lr = *sp;
*sp++;
}
/*
* And the program counter. If it's not in the list skip over
* it when we return so to not hit this again.
*/
if (data & (1 << BIT_PC)) {
frame->tf_pc = *sp;
*sp++;
} else
frame->tf_pc += 4;
/* Update the stack pointer if we haven't already done so */
if (update_sp)
frame->tf_svc_sp = (register_t)sp;
break;
case DTRACE_INVOP_B:
data = DTRACE_INVOP_DATA(invop) & 0x00ffffff;
/* Sign extend the data */
if ((data & (1 << 23)) != 0)
data |= 0xff000000;
/* The data is the number of 4-byte words to change the pc */
data *= 4;
data += 8;
frame->tf_pc += data;
break;
default:
return (-1);
break;
}
return (0);
}
void dtrace_invop_init(void)
{
dtrace_invop_jump_addr = dtrace_invop_start;
}
void dtrace_invop_uninit(void)
{
dtrace_invop_jump_addr = 0;
}