1 files changed, 345 insertions, 0 deletions
diff --git a/sys/cddl/dev/dtrace/arm/dtrace_subr.c b/sys/cddl/dev/dtrace/arm/dtrace_subr.c
new file mode 100644
index 000000000000..e2833131fcb8
--- /dev/null
+++ b/sys/cddl/dev/dtrace/arm/dtrace_subr.c
@@ -0,0 +1,345 @@
+/*
+ * 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))
+{
+	printf("IMPLEMENT ME: dtrace_toxic_ranges\n");
+}
+
+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(&current_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_pc);
+	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;
+}