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
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.
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]
26 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/types.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
40 #include <sys/dtrace_impl.h>
41 #include <sys/dtrace_bsd.h>
42 #include <machine/clock.h>
43 #include <machine/frame.h>
44 #include <machine/trap.h>
47 #define DELAYBRANCH(x) ((int)(x) < 0)
49 extern dtrace_id_t dtrace_probeid_error;
50 extern int (*dtrace_invop_jump_addr)(struct trapframe *);
52 extern void dtrace_getnanotime(struct timespec *tsp);
54 int dtrace_invop(uintptr_t, struct trapframe *, uintptr_t);
55 void dtrace_invop_init(void);
56 void dtrace_invop_uninit(void);
58 typedef struct dtrace_invop_hdlr {
59 int (*dtih_func)(uintptr_t, struct trapframe *, uintptr_t);
60 struct dtrace_invop_hdlr *dtih_next;
61 } dtrace_invop_hdlr_t;
63 dtrace_invop_hdlr_t *dtrace_invop_hdlr;
66 dtrace_invop(uintptr_t addr, struct trapframe *frame, uintptr_t arg0)
68 dtrace_invop_hdlr_t *hdlr;
71 for (hdlr = dtrace_invop_hdlr; hdlr != NULL; hdlr = hdlr->dtih_next)
72 if ((rval = hdlr->dtih_func(addr, frame, arg0)) != 0)
79 dtrace_invop_add(int (*func)(uintptr_t, struct trapframe *, uintptr_t))
81 dtrace_invop_hdlr_t *hdlr;
83 hdlr = kmem_alloc(sizeof (dtrace_invop_hdlr_t), KM_SLEEP);
84 hdlr->dtih_func = func;
85 hdlr->dtih_next = dtrace_invop_hdlr;
86 dtrace_invop_hdlr = hdlr;
90 dtrace_invop_remove(int (*func)(uintptr_t, struct trapframe *, uintptr_t))
92 dtrace_invop_hdlr_t *hdlr = dtrace_invop_hdlr, *prev = NULL;
96 panic("attempt to remove non-existent invop handler");
98 if (hdlr->dtih_func == func)
102 hdlr = hdlr->dtih_next;
106 ASSERT(dtrace_invop_hdlr == hdlr);
107 dtrace_invop_hdlr = hdlr->dtih_next;
109 ASSERT(dtrace_invop_hdlr != hdlr);
110 prev->dtih_next = hdlr->dtih_next;
119 dtrace_toxic_ranges(void (*func)(uintptr_t base, uintptr_t limit))
127 dtrace_xcall(processorid_t cpu, dtrace_xcall_t func, void *arg)
131 if (cpu == DTRACE_CPUALL)
134 CPU_SETOF(cpu, &cpus);
136 smp_rendezvous_cpus(cpus, smp_no_rendezvous_barrier, func,
137 smp_no_rendezvous_barrier, arg);
141 dtrace_sync_func(void)
148 dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);
151 static int64_t tgt_cpu_tsc;
152 static int64_t hst_cpu_tsc;
153 static int64_t timebase_skew[MAXCPU];
154 static uint64_t nsec_scale;
156 /* See below for the explanation of this macro. */
157 /* This is taken from the amd64 dtrace_subr, to provide a synchronized timer
158 * between multiple processors in dtrace. Since PowerPC Timebases can be much
159 * lower than x86, the scale shift is 26 instead of 28, allowing for a 15.63MHz
162 #define SCALE_SHIFT 26
165 dtrace_gethrtime_init_cpu(void *arg)
167 uintptr_t cpu = (uintptr_t) arg;
170 tgt_cpu_tsc = mftb();
172 hst_cpu_tsc = mftb();
176 dtrace_gethrtime_init(void *arg)
183 tb_f = cpu_tickrate();
186 * The following line checks that nsec_scale calculated below
187 * doesn't overflow 32-bit unsigned integer, so that it can multiply
188 * another 32-bit integer without overflowing 64-bit.
189 * Thus minimum supported Timebase frequency is 15.63MHz.
191 KASSERT(tb_f > (NANOSEC >> (32 - SCALE_SHIFT)), ("Timebase frequency is too low"));
194 * We scale up NANOSEC/tb_f ratio to preserve as much precision
196 * 2^26 factor was chosen quite arbitrarily from practical
198 * - it supports TSC frequencies as low as 15.63MHz (see above);
200 nsec_scale = ((uint64_t)NANOSEC << SCALE_SHIFT) / tb_f;
202 /* The current CPU is the reference one. */
204 timebase_skew[curcpu] = 0;
210 CPU_SETOF(PCPU_GET(cpuid), &map);
211 CPU_SET(pc->pc_cpuid, &map);
213 smp_rendezvous_cpus(map, NULL,
214 dtrace_gethrtime_init_cpu,
215 smp_no_rendezvous_barrier, (void *)(uintptr_t) i);
217 timebase_skew[i] = tgt_cpu_tsc - hst_cpu_tsc;
221 #ifdef EARLY_AP_STARTUP
222 SYSINIT(dtrace_gethrtime_init, SI_SUB_DTRACE, SI_ORDER_ANY,
223 dtrace_gethrtime_init, NULL);
225 SYSINIT(dtrace_gethrtime_init, SI_SUB_SMP, SI_ORDER_ANY, dtrace_gethrtime_init,
230 * DTrace needs a high resolution time function which can
231 * be called from a probe context and guaranteed not to have
232 * instrumented with probes itself.
234 * Returns nanoseconds since boot.
244 * We split timebase value into lower and higher 32-bit halves and separately
245 * scale them with nsec_scale, then we scale them down by 2^28
246 * (see nsec_scale calculations) taking into account 32-bit shift of
247 * the higher half and finally add.
249 timebase = mftb() - timebase_skew[curcpu];
252 return (((lo * nsec_scale) >> SCALE_SHIFT) +
253 ((hi * nsec_scale) << (32 - SCALE_SHIFT)));
257 dtrace_gethrestime(void)
259 struct timespec curtime;
261 dtrace_getnanotime(&curtime);
263 return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
266 /* Function to handle DTrace traps during probes. See powerpc/powerpc/trap.c */
268 dtrace_trap(struct trapframe *frame, u_int type)
273 * A trap can occur while DTrace executes a probe. Before
274 * executing the probe, DTrace blocks re-scheduling and sets
275 * a flag in its per-cpu flags to indicate that it doesn't
276 * want to fault. On returning from the probe, the no-fault
277 * flag is cleared and finally re-scheduling is enabled.
279 * Check if DTrace has enabled 'no-fault' mode:
282 nofault = cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT;
285 KASSERT((frame->srr1 & PSL_EE) == 0, ("interrupts enabled"));
287 * There are only a couple of trap types that are expected.
288 * All the rest will be handled in the usual way.
294 /* Flag a bad address. */
295 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
296 cpu_core[curcpu].cpuc_dtrace_illval = frame->dar;
299 * Offset the instruction pointer to the instruction
300 * following the one causing the fault.
302 frame->srr0 += sizeof(int);
306 /* Flag a bad address. */
307 cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
308 cpu_core[curcpu].cpuc_dtrace_illval = frame->srr0;
311 * Offset the instruction pointer to the instruction
312 * following the one causing the fault.
314 frame->srr0 += sizeof(int);
317 /* Handle all other traps in the usual way. */
322 /* Handle the trap in the usual way. */
327 dtrace_probe_error(dtrace_state_t *state, dtrace_epid_t epid, int which,
328 int fault, int fltoffs, uintptr_t illval)
331 dtrace_probe(dtrace_probeid_error, (uint64_t)(uintptr_t)state,
333 (uintptr_t)which, (uintptr_t)fault, (uintptr_t)fltoffs);
337 dtrace_invop_start(struct trapframe *frame)
340 switch (dtrace_invop(frame->srr0, frame, frame->fixreg[3])) {
341 case DTRACE_INVOP_JUMP:
343 case DTRACE_INVOP_BCTR:
344 frame->srr0 = frame->ctr;
346 case DTRACE_INVOP_BLR:
347 frame->srr0 = frame->lr;
349 case DTRACE_INVOP_MFLR_R0:
350 frame->fixreg[0] = frame->lr;
351 frame->srr0 = frame->srr0 + 4;
359 void dtrace_invop_init(void)
361 dtrace_invop_jump_addr = dtrace_invop_start;
364 void dtrace_invop_uninit(void)
366 dtrace_invop_jump_addr = 0;