/*
 * 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
 */
/*
 * 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/dtrace_impl.h>
#include <sys/kernel.h>
#include <sys/stack.h>
#include <sys/pcpu.h>

#include <machine/frame.h>
#include <machine/md_var.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"

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;
        register_t sp;
        int scp_offset;
        int depth = 0;

        if (intrpc != 0)
                pcstack[depth++] = (pc_t) intrpc;

        aframes++;

        __asm __volatile("mov %0, sp" : "=&r" (sp));

        state.registers[FP] = (uint32_t)__builtin_frame_address(0);
        state.registers[SP] = sp;
        state.registers[LR] = (uint32_t)__builtin_return_address(0);
        state.registers[PC] = (uint32_t)dtrace_getpcstack;

        while (depth < pcstack_limit) {
                int done;

                done = unwind_stack_one(&state, 1);

                /*
                 * 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.registers[PC];
                }

                if (done)
                        break;
        }

        for (; depth < pcstack_limit; depth++) {
                pcstack[depth] = 0;
        }
}

void
dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
{
        printf("IMPLEMENT ME: %s\n", __func__);
}

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)
{
/*      struct arm_frame *fp = (struct arm_frame *)dtrace_getfp();*/

        return (0);
}

int
dtrace_getstackdepth(int aframes)
{
        struct unwind_state state;
        register_t sp;
        int scp_offset;
        int done = 0;
        int depth = 1;

        __asm __volatile("mov %0, sp" : "=&r" (sp));

        state.registers[FP] = (uint32_t)__builtin_frame_address(0);
        state.registers[SP] = sp;
        state.registers[LR] = (uint32_t)__builtin_return_address(0);
        state.registers[PC] = (uint32_t)dtrace_getstackdepth;

        do {
                done = unwind_stack_one(&state, 1);
                depth++;
        } while (!done);

        if (depth < aframes)
                return 0;
        else
                return depth - aframes;
}

ulong_t
dtrace_getreg(struct trapframe *frame, 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));
}