/*      $NetBSD: process_machdep.c,v 1.25 2020/10/19 17:47:37 christos Exp $    */

/*
 * Copyright (c) 1993 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * From:
 *      Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel
 */

/*
 * Copyright (c) 1995, 1996, 1997
 *      Charles M. Hannum.  All rights reserved.
 * Copyright (c) 1993 Jan-Simon Pendry
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * From:
 *      Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.25 2020/10/19 17:47:37 christos Exp $");

#ifdef _KERNEL_OPT
#include "opt_compat_netbsd.h"
#include "opt_ptrace.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/ptrace.h>

#include <machine/psl.h>
#include <machine/reg.h>

#ifdef COMPAT_40
static int process_machdep_doregs40(struct lwp *, struct lwp *, struct uio *);
static int process_machdep_read_regs40(struct lwp *l, struct __reg40 *);
static int process_machdep_write_regs40(struct lwp *l, struct __reg40 *);
#endif /* COMPAT_40 */


static inline struct trapframe *
process_frame(struct lwp *l)
{

        return (l->l_md.md_regs);
}

int
process_read_regs(struct lwp *l, struct reg *regs)
{
        struct trapframe *tf = process_frame(l);

        regs->r_spc = tf->tf_spc;
        regs->r_ssr = tf->tf_ssr;
        regs->r_gbr = tf->tf_gbr;
        regs->r_macl = tf->tf_macl;
        regs->r_mach = tf->tf_mach;
        regs->r_pr = tf->tf_pr;
        regs->r_r14 = tf->tf_r14;
        regs->r_r13 = tf->tf_r13;
        regs->r_r12 = tf->tf_r12;
        regs->r_r11 = tf->tf_r11;
        regs->r_r10 = tf->tf_r10;
        regs->r_r9 = tf->tf_r9;
        regs->r_r8 = tf->tf_r8;
        regs->r_r7 = tf->tf_r7;
        regs->r_r6 = tf->tf_r6;
        regs->r_r5 = tf->tf_r5;
        regs->r_r4 = tf->tf_r4;
        regs->r_r3 = tf->tf_r3;
        regs->r_r2 = tf->tf_r2;
        regs->r_r1 = tf->tf_r1;
        regs->r_r0 = tf->tf_r0;
        regs->r_r15 = tf->tf_r15;

        return (0);
}

#ifdef PTRACE_HOOKS

int
process_write_regs(struct lwp *l, const struct reg *regs)
{
        struct trapframe *tf = process_frame(l);

        /*
         * Check for security violations.
         */
        if (((regs->r_ssr ^ tf->tf_ssr) & PSL_USERSTATIC) != 0) {
                return (EINVAL);
        }

        tf->tf_spc = regs->r_spc;
        tf->tf_ssr = regs->r_ssr;
        tf->tf_pr = regs->r_pr;

        tf->tf_gbr = regs->r_gbr;
        tf->tf_mach = regs->r_mach;
        tf->tf_macl = regs->r_macl;
        tf->tf_r14 = regs->r_r14;
        tf->tf_r13 = regs->r_r13;
        tf->tf_r12 = regs->r_r12;
        tf->tf_r11 = regs->r_r11;
        tf->tf_r10 = regs->r_r10;
        tf->tf_r9 = regs->r_r9;
        tf->tf_r8 = regs->r_r8;
        tf->tf_r7 = regs->r_r7;
        tf->tf_r6 = regs->r_r6;
        tf->tf_r5 = regs->r_r5;
        tf->tf_r4 = regs->r_r4;
        tf->tf_r3 = regs->r_r3;
        tf->tf_r2 = regs->r_r2;
        tf->tf_r1 = regs->r_r1;
        tf->tf_r0 = regs->r_r0;
        tf->tf_r15 = regs->r_r15;

        return (0);
}


#ifdef __HAVE_PTRACE_MACHDEP

int
ptrace_machdep_dorequest(struct lwp *l, struct lwp **lt,
                         int req, void *addr, int data)
{
        struct uio uio;
        struct iovec iov;
        int write = 0, error;

        switch (req) {
        default:
                return EINVAL;

#ifdef COMPAT_40
        case PT___SETREGS40:
                write = 1;
                /* FALLTHROUGH*/

        case PT___GETREGS40:
                if ((error = ptrace_update_lwp((*lt)->l_proc, lt, data)) != 0)
                        return error;
                if (!process_validregs(*lt))
                        return EINVAL;
                iov.iov_base = addr;
                iov.iov_len = sizeof(struct __reg40);
                uio.uio_iov = &iov;
                uio.uio_iovcnt = 1;
                uio.uio_offset = 0;
                uio.uio_resid = sizeof(struct __reg40);
                uio.uio_rw = write ? UIO_WRITE : UIO_READ;
                uio.uio_vmspace = l->l_proc->p_vmspace;
                return process_machdep_doregs40(l, *lt, &uio);
#endif  /* COMPAT_40 */
        }
}


#ifdef COMPAT_40

static int
process_machdep_doregs40(struct lwp *curl, struct lwp *l, struct uio *uio)
{
        struct __reg40 r;
        int error;
        char *kv;
        int kl;

        kl = sizeof(r);
        kv = (char *) &r;

        kv += uio->uio_offset;
        kl -= uio->uio_offset;
        if (kl > uio->uio_resid)
                kl = uio->uio_resid;

        if (kl < 0)
                error = EINVAL;
        else
                error = process_machdep_read_regs40(l, &r);
        if (error == 0)
                error = uiomove(kv, kl, uio);
        if (error == 0 && uio->uio_rw == UIO_WRITE) {
                if (l->l_proc->p_stat != SSTOP)
                        error = EBUSY;
                else
                        error = process_machdep_write_regs40(l, &r);
        }

        uio->uio_offset = 0;
        return error;
}

/*
 * Like process_read_regs() but for old struct reg w/out r_gbr.
 */
static int
process_machdep_read_regs40(struct lwp *l, struct __reg40 *regs)
{
        struct trapframe *tf = process_frame(l);

        regs->r_spc = tf->tf_spc;
        regs->r_ssr = tf->tf_ssr;
        /* no r_gbr in struct __reg40 */
        regs->r_macl = tf->tf_macl;
        regs->r_mach = tf->tf_mach;
        regs->r_pr = tf->tf_pr;
        regs->r_r14 = tf->tf_r14;
        regs->r_r13 = tf->tf_r13;
        regs->r_r12 = tf->tf_r12;
        regs->r_r11 = tf->tf_r11;
        regs->r_r10 = tf->tf_r10;
        regs->r_r9 = tf->tf_r9;
        regs->r_r8 = tf->tf_r8;
        regs->r_r7 = tf->tf_r7;
        regs->r_r6 = tf->tf_r6;
        regs->r_r5 = tf->tf_r5;
        regs->r_r4 = tf->tf_r4;
        regs->r_r3 = tf->tf_r3;
        regs->r_r2 = tf->tf_r2;
        regs->r_r1 = tf->tf_r1;
        regs->r_r0 = tf->tf_r0;
        regs->r_r15 = tf->tf_r15;

        return 0;
}

/*
 * Like process_write_regs() but for old struct reg w/out r_gbr
 */
static int
process_machdep_write_regs40(struct lwp *l, struct __reg40 *regs)
{
        struct trapframe *tf = process_frame(l);

        /*
         * Check for security violations.
         */
        if (((regs->r_ssr ^ tf->tf_ssr) & PSL_USERSTATIC) != 0) {
                return EINVAL;
        }

        tf->tf_spc = regs->r_spc;
        tf->tf_ssr = regs->r_ssr;
        tf->tf_pr = regs->r_pr;

        /* no r_gbr in struct __reg40 */
        tf->tf_mach = regs->r_mach;
        tf->tf_macl = regs->r_macl;
        tf->tf_r14 = regs->r_r14;
        tf->tf_r13 = regs->r_r13;
        tf->tf_r12 = regs->r_r12;
        tf->tf_r11 = regs->r_r11;
        tf->tf_r10 = regs->r_r10;
        tf->tf_r9 = regs->r_r9;
        tf->tf_r8 = regs->r_r8;
        tf->tf_r7 = regs->r_r7;
        tf->tf_r6 = regs->r_r6;
        tf->tf_r5 = regs->r_r5;
        tf->tf_r4 = regs->r_r4;
        tf->tf_r3 = regs->r_r3;
        tf->tf_r2 = regs->r_r2;
        tf->tf_r1 = regs->r_r1;
        tf->tf_r0 = regs->r_r0;
        tf->tf_r15 = regs->r_r15;

        return 0;
}

#endif /* COMPAT_40 */

#endif /* __HAVE_PTRACE_MACHDEP  */


int
process_sstep(struct lwp *l, int sstep)
{

        if (sstep)
                l->l_md.md_flags |= MDL_SSTEP;
        else
                l->l_md.md_flags &= ~MDL_SSTEP;

        return 0;
}

int
process_set_pc(struct lwp *l, void *addr)
{
        struct trapframe *tf = process_frame(l);

        tf->tf_spc = (int)addr;

        return (0);
}

#endif /* PTRACE_HOOKS */