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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/dtrace.h>
#include <sys/fasttrap.h>
#include <sys/x_call.h>
#include <sys/atomic.h>
#include <sys/machsystm.h>
static void
dtrace_xcall_func(uint64_t arg1, uint64_t arg2)
{
(*(dtrace_xcall_t)arg1)((void *)(arg2));
}
void
dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg)
{
if (cpu == DTRACE_CPUALL) {
xc_all(dtrace_xcall_func, (uint64_t)func, (uint64_t)arg);
} else {
xc_one(cpu, dtrace_xcall_func, (uint64_t)func, (uint64_t)arg);
}
}
/*ARGSUSED*/
static void
dtrace_sync_func(uint64_t arg1, uint64_t arg2)
{
membar_consumer();
}
void
dtrace_sync(void)
{
membar_producer();
xc_all(dtrace_sync_func, 0, 0);
}
void
dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
{
(*func)(PIOMAPBASE, PIOMAPBASE + PIOMAPSIZE);
(*func)(OFW_START_ADDR, OFW_END_ADDR);
if (hole_end > hole_start)
(*func)((uintptr_t)hole_start, (uintptr_t)hole_end);
}
int (*dtrace_pid_probe_ptr)(struct regs *);
void
dtrace_pid_probe(struct regs *rp)
{
krwlock_t *rwp = &CPU->cpu_ft_lock;
uint32_t instr;
/*
* This trap should only be invoked if there's a corresponding
* enabled dtrace probe. If there isn't, send SIGILL as though
* the process had executed an invalid trap instruction.
*/
rw_enter(rwp, RW_READER);
if (dtrace_pid_probe_ptr != NULL && (*dtrace_pid_probe_ptr)(rp) == 0) {
rw_exit(rwp);
return;
}
rw_exit(rwp);
/*
* It is possible that we were preempted after entering the kernel,
* and the tracepoint was removed. If it appears that the process hit
* our reserved trap instruction, we call send SIGILL just as though
* the user had executed an unused trap instruction.
*/
if (fuword32((void *)rp->r_pc, &instr) != 0 ||
instr == FASTTRAP_INSTR) {
sigqueue_t *sqp = kmem_zalloc(sizeof (sigqueue_t), KM_SLEEP);
proc_t *p = curproc;
sqp->sq_info.si_signo = SIGILL;
sqp->sq_info.si_code = ILL_ILLTRP;
sqp->sq_info.si_addr = (caddr_t)rp->r_pc;
sqp->sq_info.si_trapno = 0x38;
mutex_enter(&p->p_lock);
sigaddqa(p, curthread, sqp);
mutex_exit(&p->p_lock);
aston(curthread);
}
}
int (*dtrace_return_probe_ptr)(struct regs *);
void
dtrace_return_probe(struct regs *rp)
{
krwlock_t *rwp;
uintptr_t npc = curthread->t_dtrace_npc;
uint8_t step = curthread->t_dtrace_step;
uint8_t ret = curthread->t_dtrace_ret;
if (curthread->t_dtrace_ast) {
aston(curthread);
curthread->t_sig_check = 1;
}
/*
* Clear all user tracing flags.
*/
curthread->t_dtrace_ft = 0;
/*
* If we weren't expecting to take a return probe trap, kill the
* process as though it had just executed an unassigned trap
* instruction.
*/
if (step == 0) {
tsignal(curthread, SIGILL);
return;
}
ASSERT(rp->r_npc == rp->r_pc + 4);
/*
* If we hit this trap unrelated to a return probe, we're just here
* to reset the AST flag since we deferred a signal until after we
* logically single-stepped the instruction we copied out.
*/
if (ret == 0) {
rp->r_pc = npc;
rp->r_npc = npc + 4;
return;
}
/*
* We need to wait until after we've called the dtrace_return_probe_ptr
* function pointer to set %pc and %npc.
*/
rwp = &CPU->cpu_ft_lock;
rw_enter(rwp, RW_READER);
if (dtrace_return_probe_ptr != NULL)
(void) (*dtrace_return_probe_ptr)(rp);
rw_exit(rwp);
rp->r_pc = npc;
rp->r_npc = npc + 4;
}
void
dtrace_safe_synchronous_signal(void)
{
kthread_t *t = curthread;
struct regs *rp = lwptoregs(ttolwp(t));
ASSERT(t->t_dtrace_on);
/*
* If we're not actively tracing an instruction, turn off tracing
* flags. If the instruction we copied out caused a synchronous
* trap, reset the pc and npc back to their original values and turn
* off the flags.
*/
if (rp->r_pc != t->t_dtrace_scrpc && rp->r_pc != t->t_dtrace_astpc &&
rp->r_npc != t->t_dtrace_astpc) {
t->t_dtrace_ft = 0;
} else if (rp->r_pc == t->t_dtrace_scrpc) {
rp->r_pc = t->t_dtrace_pc;
rp->r_npc = t->t_dtrace_npc;
t->t_dtrace_ft = 0;
}
}
int
dtrace_safe_defer_signal(void)
{
kthread_t *t = curthread;
struct regs *rp = lwptoregs(ttolwp(t));
ASSERT(t->t_dtrace_on);
/*
* If we're not actively tracing an instruction, turn off tracing
* flags.
*/
if (rp->r_pc != t->t_dtrace_scrpc && rp->r_pc != t->t_dtrace_astpc &&
rp->r_npc != t->t_dtrace_astpc) {
t->t_dtrace_ft = 0;
return (0);
}
/*
* Otherwise, make sure we'll return to the kernel after executing
* the instruction we copied out.
*/
if (!t->t_dtrace_step) {
ASSERT(rp->r_pc == t->t_dtrace_scrpc);
rp->r_npc = t->t_dtrace_astpc;
t->t_dtrace_step = 1;
}
t->t_dtrace_ast = 1;
return (1);
}
/*
* Additional artificial frames for the machine type. For SPARC, we're already
* accounted for, so return 0.
*/
int
dtrace_mach_aframes(void)
{
return (0);
}
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