1 files changed, 367 insertions, 0 deletions
diff --git a/sys/cddl/dev/dtrace/powerpc/dtrace_subr.c b/sys/cddl/dev/dtrace/powerpc/dtrace_subr.c
new file mode 100644
index 000000000000..ed171f1135e9
--- /dev/null
+++ b/sys/cddl/dev/dtrace/powerpc/dtrace_subr.c
@@ -0,0 +1,367 @@
+/*
+ * 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;
+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 arg0)
+{
+	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, arg0)) != 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))
+{
+	/*
+	 * 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_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);
+}
+
+static int64_t	tgt_cpu_tsc;
+static int64_t	hst_cpu_tsc;
+static int64_t	timebase_skew[MAXCPU];
+static uint64_t	nsec_scale;
+
+/* See below for the explanation of this macro. */
+/* This is taken from the amd64 dtrace_subr, to provide a synchronized timer
+ * between multiple processors in dtrace.  Since PowerPC Timebases can be much
+ * lower than x86, the scale shift is 26 instead of 28, allowing for a 15.63MHz
+ * timebase.
+ */
+#define SCALE_SHIFT	26
+
+static void
+dtrace_gethrtime_init_cpu(void *arg)
+{
+	uintptr_t cpu = (uintptr_t) arg;
+
+	if (cpu == curcpu)
+		tgt_cpu_tsc = mftb();
+	else
+		hst_cpu_tsc = mftb();
+}
+
+static void
+dtrace_gethrtime_init(void *arg)
+{
+	struct pcpu *pc;
+	uint64_t tb_f;
+	cpuset_t map;
+	int i;
+
+	tb_f = cpu_tickrate();
+
+	/*
+	 * The following line checks that nsec_scale calculated below
+	 * doesn't overflow 32-bit unsigned integer, so that it can multiply
+	 * another 32-bit integer without overflowing 64-bit.
+	 * Thus minimum supported Timebase frequency is 15.63MHz.
+	 */
+	KASSERT(tb_f > (NANOSEC >> (32 - SCALE_SHIFT)), ("Timebase frequency is too low"));
+
+	/*
+	 * We scale up NANOSEC/tb_f ratio to preserve as much precision
+	 * as possible.
+	 * 2^26 factor was chosen quite arbitrarily from practical
+	 * considerations:
+	 * - it supports TSC frequencies as low as 15.63MHz (see above);
+	 */
+	nsec_scale = ((uint64_t)NANOSEC << SCALE_SHIFT) / tb_f;
+
+	/* The current CPU is the reference one. */
+	sched_pin();
+	timebase_skew[curcpu] = 0;
+	CPU_FOREACH(i) {
+		if (i == curcpu)
+			continue;
+
+		pc = pcpu_find(i);
+		CPU_SETOF(PCPU_GET(cpuid), &map);
+		CPU_SET(pc->pc_cpuid, &map);
+
+		smp_rendezvous_cpus(map, NULL,
+		    dtrace_gethrtime_init_cpu,
+		    smp_no_rendezvous_barrier, (void *)(uintptr_t) i);
+
+		timebase_skew[i] = tgt_cpu_tsc - hst_cpu_tsc;
+	}
+	sched_unpin();
+}
+#ifdef EARLY_AP_STARTUP
+SYSINIT(dtrace_gethrtime_init, SI_SUB_DTRACE, SI_ORDER_ANY,
+    dtrace_gethrtime_init, NULL);
+#else
+SYSINIT(dtrace_gethrtime_init, SI_SUB_SMP, SI_ORDER_ANY, dtrace_gethrtime_init,
+    NULL);
+#endif
+
+/*
+ * 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()
+{
+	uint64_t timebase;
+	uint32_t lo;
+	uint32_t hi;
+
+	/*
+	 * We split timebase value into lower and higher 32-bit halves and separately
+	 * scale them with nsec_scale, then we scale them down by 2^28
+	 * (see nsec_scale calculations) taking into account 32-bit shift of
+	 * the higher half and finally add.
+	 */
+	timebase = mftb() - timebase_skew[curcpu];
+	lo = timebase;
+	hi = timebase >> 32;
+	return (((lo * nsec_scale) >> SCALE_SHIFT) +
+	    ((hi * nsec_scale) << (32 - SCALE_SHIFT)));
+}
+
+uint64_t
+dtrace_gethrestime(void)
+{
+	struct      timespec curtime;
+
+	dtrace_getnanotime(&curtime);
+
+	return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);
+}
+
+/* Function to handle DTrace traps during probes. See powerpc/powerpc/trap.c */
+int
+dtrace_trap(struct trapframe *frame, u_int type)
+{
+	uint16_t nofault;
+
+	/*
+	 * 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:
+	 */
+	sched_pin();
+	nofault = cpu_core[curcpu].cpuc_dtrace_flags & CPU_DTRACE_NOFAULT;
+	sched_unpin();
+	if (nofault) {
+		KASSERT((frame->srr1 & PSL_EE) == 0, ("interrupts enabled"));
+		/*
+		 * 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 EXC_DSI:
+		case EXC_DSE:
+			/* Flag a bad address. */
+			cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
+			cpu_core[curcpu].cpuc_dtrace_illval = frame->dar;
+
+			/*
+			 * Offset the instruction pointer to the instruction
+			 * following the one causing the fault.
+			 */
+			frame->srr0 += sizeof(int);
+			return (1);
+		case EXC_ISI:
+		case EXC_ISE:
+			/* Flag a bad address. */
+			cpu_core[curcpu].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR;
+			cpu_core[curcpu].cpuc_dtrace_illval = frame->srr0;
+
+			/*
+			 * Offset the instruction pointer to the instruction
+			 * following the one causing the fault.
+			 */
+			frame->srr0 += 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)
+{
+
+	switch (dtrace_invop(frame->srr0, frame, frame->fixreg[3])) {
+	case DTRACE_INVOP_JUMP:
+		break;
+	case DTRACE_INVOP_BCTR:
+		frame->srr0 = frame->ctr;
+		break;
+	case DTRACE_INVOP_BLR:
+		frame->srr0 = frame->lr;
+		break;
+	case DTRACE_INVOP_MFLR_R0:
+		frame->fixreg[0] = frame->lr;
+		frame->srr0 = frame->srr0 + 4;
+		break;
+	default:
+		return (-1);
+	}
+	return (0);
+}
+
+void dtrace_invop_init(void)
+{
+	dtrace_invop_jump_addr = dtrace_invop_start;
+}
+
+void dtrace_invop_uninit(void)
+{
+	dtrace_invop_jump_addr = 0;
+}