1 files changed, 394 insertions, 0 deletions
diff --git a/sys/cddl/dev/dtrace/riscv/dtrace_isa.c b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
new file mode 100644
index 000000000000..955d2cb10f65
--- /dev/null
+++ b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
@@ -0,0 +1,394 @@
+/*
+ * 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
+ *
+ * Portions Copyright 2016 Ruslan Bukin <br@bsdpad.com>
+ *
+ * $FreeBSD$
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+#include <sys/cdefs.h>
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/stack.h>
+#include <sys/pcpu.h>
+
+#include <machine/frame.h>
+#include <machine/md_var.h>
+#include <machine/reg.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+
+#include <machine/atomic.h>
+#include <machine/db_machdep.h>
+#include <machine/md_var.h>
+#include <machine/stack.h>
+#include <ddb/db_sym.h>
+#include <ddb/ddb.h>
+#include <sys/kdb.h>
+
+#include "regset.h"
+
+/*
+ * Wee need some reasonable default to prevent backtrace code
+ * from wandering too far
+ */
+#define	MAX_FUNCTION_SIZE 0x10000
+#define	MAX_PROLOGUE_SIZE 0x100
+#define	MAX_USTACK_DEPTH  2048
+
+uint8_t dtrace_fuword8_nocheck(void *);
+uint16_t dtrace_fuword16_nocheck(void *);
+uint32_t dtrace_fuword32_nocheck(void *);
+uint64_t dtrace_fuword64_nocheck(void *);
+
+void
+dtrace_getpcstack(pc_t *pcstack, int pcstack_limit, int aframes,
+    uint32_t *intrpc)
+{
+	struct unwind_state state;
+	int scp_offset;
+	register_t sp;
+	int depth;
+
+	depth = 0;
+
+	if (intrpc != 0) {
+		pcstack[depth++] = (pc_t) intrpc;
+	}
+
+	aframes++;
+
+	__asm __volatile("mv %0, sp" : "=&r" (sp));
+
+	state.fp = (uint64_t)__builtin_frame_address(0);
+	state.sp = sp;
+	state.pc = (uint64_t)dtrace_getpcstack;
+
+	while (depth < pcstack_limit) {
+		if (unwind_frame(&state))
+			break;
+
+		if (!INKERNEL(state.pc) || !INKERNEL(state.fp))
+			break;
+
+		/*
+		 * NB: Unlike some other architectures, we don't need to
+		 * explicitly insert cpu_dtrace_caller as it appears in the
+		 * normal kernel stack trace rather than a special trap frame.
+		 */
+		if (aframes > 0) {
+			aframes--;
+		} else {
+			pcstack[depth++] = state.pc;
+		}
+
+	}
+
+	for (; depth < pcstack_limit; depth++) {
+		pcstack[depth] = 0;
+	}
+}
+
+static int
+dtrace_getustack_common(uint64_t *pcstack, int pcstack_limit, uintptr_t pc,
+    uintptr_t fp)
+{
+	volatile uint16_t *flags;
+	uintptr_t oldfp;
+	int ret;
+
+	ret = 0;
+	flags = (volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags;
+
+	ASSERT(pcstack == NULL || pcstack_limit > 0);
+
+	while (pc != 0) {
+		/*
+		 * We limit the number of times we can go around this
+		 * loop to account for a circular stack.
+		 */
+		if (ret++ >= MAX_USTACK_DEPTH) {
+			*flags |= CPU_DTRACE_BADSTACK;
+			cpu_core[curcpu].cpuc_dtrace_illval = fp;
+			break;
+		}
+
+		if (pcstack != NULL) {
+			*pcstack++ = (uint64_t)pc;
+			pcstack_limit--;
+			if (pcstack_limit <= 0)
+				break;
+		}
+
+		if (fp == 0)
+			break;
+
+		pc = dtrace_fuword64((void *)(fp +
+		    offsetof(struct riscv_frame, f_retaddr)));
+		fp = dtrace_fuword64((void *)fp);
+
+		if (fp == oldfp) {
+			*flags |= CPU_DTRACE_BADSTACK;
+			cpu_core[curcpu].cpuc_dtrace_illval = fp;
+			break;
+		}
+	}
+
+	return (ret);
+}
+
+void
+dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
+{
+	volatile uint16_t *flags;
+	struct trapframe *tf;
+	uintptr_t pc, sp, fp;
+	proc_t *p;
+	int n;
+
+	p = curproc;
+	flags = (volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags;
+
+	if (*flags & CPU_DTRACE_FAULT)
+		return;
+
+	if (pcstack_limit <= 0)
+		return;
+
+	/*
+	 * If there's no user context we still need to zero the stack.
+	 */
+	if (p == NULL || (tf = curthread->td_frame) == NULL)
+		goto zero;
+
+	*pcstack++ = (uint64_t)p->p_pid;
+	pcstack_limit--;
+
+	if (pcstack_limit <= 0)
+		return;
+
+	pc = tf->tf_sepc;
+	sp = tf->tf_sp;
+	fp = tf->tf_s[0];
+
+	if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
+		/*
+		 * In an entry probe.  The frame pointer has not yet been
+		 * pushed (that happens in the function prologue).  The
+		 * best approach is to add the current pc as a missing top
+		 * of stack and back the pc up to the caller, which is stored
+		 * at the current stack pointer address since the call
+		 * instruction puts it there right before the branch.
+		 */
+
+		*pcstack++ = (uint64_t)pc;
+		pcstack_limit--;
+		if (pcstack_limit <= 0)
+			return;
+
+		pc = tf->tf_ra;
+	}
+
+	n = dtrace_getustack_common(pcstack, pcstack_limit, pc, fp);
+	ASSERT(n >= 0);
+	ASSERT(n <= pcstack_limit);
+
+	pcstack += n;
+	pcstack_limit -= n;
+
+zero:
+	while (pcstack_limit-- > 0)
+		*pcstack++ = 0;
+}
+
+int
+dtrace_getustackdepth(void)
+{
+
+	printf("IMPLEMENT ME: %s\n", __func__);
+
+	return (0);
+}
+
+void
+dtrace_getufpstack(uint64_t *pcstack, uint64_t *fpstack, int pcstack_limit)
+{
+
+	printf("IMPLEMENT ME: %s\n", __func__);
+}
+
+/*ARGSUSED*/
+uint64_t
+dtrace_getarg(int arg, int aframes)
+{
+
+	printf("IMPLEMENT ME: %s\n", __func__);
+
+	return (0);
+}
+
+int
+dtrace_getstackdepth(int aframes)
+{
+	struct unwind_state state;
+	int scp_offset;
+	register_t sp;
+	int depth;
+	int done;
+
+	depth = 1;
+	done = 0;
+
+	__asm __volatile("mv %0, sp" : "=&r" (sp));
+
+	state.fp = (uint64_t)__builtin_frame_address(0);
+	state.sp = sp;
+	state.pc = (uint64_t)dtrace_getstackdepth;
+
+	do {
+		done = unwind_frame(&state);
+		if (!INKERNEL(state.pc) || !INKERNEL(state.fp))
+			break;
+		depth++;
+	} while (!done);
+
+	if (depth < aframes)
+		return (0);
+	else
+		return (depth - aframes);
+}
+
+ulong_t
+dtrace_getreg(struct trapframe *rp, uint_t reg)
+{
+
+	printf("IMPLEMENT ME: %s\n", __func__);
+
+	return (0);
+}
+
+static int
+dtrace_copycheck(uintptr_t uaddr, uintptr_t kaddr, size_t size)
+{
+
+	if (uaddr + size > VM_MAXUSER_ADDRESS || uaddr + size < uaddr) {
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+		cpu_core[curcpu].cpuc_dtrace_illval = uaddr;
+		return (0);
+	}
+
+	return (1);
+}
+
+void
+dtrace_copyin(uintptr_t uaddr, uintptr_t kaddr, size_t size,
+    volatile uint16_t *flags)
+{
+
+	if (dtrace_copycheck(uaddr, kaddr, size))
+		dtrace_copy(uaddr, kaddr, size);
+}
+
+void
+dtrace_copyout(uintptr_t kaddr, uintptr_t uaddr, size_t size,
+    volatile uint16_t *flags)
+{
+
+	if (dtrace_copycheck(uaddr, kaddr, size))
+		dtrace_copy(kaddr, uaddr, size);
+}
+
+void
+dtrace_copyinstr(uintptr_t uaddr, uintptr_t kaddr, size_t size,
+    volatile uint16_t *flags)
+{
+
+	if (dtrace_copycheck(uaddr, kaddr, size))
+		dtrace_copystr(uaddr, kaddr, size, flags);
+}
+
+void
+dtrace_copyoutstr(uintptr_t kaddr, uintptr_t uaddr, size_t size,
+    volatile uint16_t *flags)
+{
+
+	if (dtrace_copycheck(uaddr, kaddr, size))
+		dtrace_copystr(kaddr, uaddr, size, flags);
+}
+
+uint8_t
+dtrace_fuword8(void *uaddr)
+{
+
+	if ((uintptr_t)uaddr > VM_MAXUSER_ADDRESS) {
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+		cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr;
+		return (0);
+	}
+
+	return (dtrace_fuword8_nocheck(uaddr));
+}
+
+uint16_t
+dtrace_fuword16(void *uaddr)
+{
+
+	if ((uintptr_t)uaddr > VM_MAXUSER_ADDRESS) {
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+		cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr;
+		return (0);
+	}
+
+	return (dtrace_fuword16_nocheck(uaddr));
+}
+
+uint32_t
+dtrace_fuword32(void *uaddr)
+{
+
+	if ((uintptr_t)uaddr > VM_MAXUSER_ADDRESS) {
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+		cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr;
+		return (0);
+	}
+
+	return (dtrace_fuword32_nocheck(uaddr));
+}
+
+uint64_t
+dtrace_fuword64(void *uaddr)
+{
+
+	if ((uintptr_t)uaddr > VM_MAXUSER_ADDRESS) {
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+		cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr;
+		return (0);
+	}
+
+	return (dtrace_fuword64_nocheck(uaddr));
+}