/*      $NetBSD: syscall.c,v 1.58 2023/10/05 19:41:05 ad Exp $  */

/*
 * Copyright (C) 2002 Matt Thomas
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * 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 TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */

/* DO NOT INCLUDE opt_compat_XXX.h */
/* If needed, they will be included by file that includes this one */

#include <sys/param.h>
#include <sys/cpu.h>
#include <sys/ktrace.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/systm.h>
#include <sys/syscallvar.h>

#include <uvm/uvm_extern.h>

#include <powerpc/frame.h>
#include <powerpc/pcb.h>
#include <powerpc/userret.h>

#define FIRSTARG        3               /* first argument is in reg 3 */
#define NARGREG         8               /* 8 args are in registers */
#define MOREARGS(sp)    ((void *)((uintptr_t)(sp) + 8)) /* more args go here */

#ifndef EMULNAME
#include <sys/syscall.h>

#define EMULNAME(x)     (x)
#define EMULNAMEU(x)    (x)

__KERNEL_RCSID(0, "$NetBSD: syscall.c,v 1.58 2023/10/05 19:41:05 ad Exp $");

void
md_child_return(struct lwp *l)
{
        struct trapframe * const tf = l->l_md.md_utf;

        tf->tf_fixreg[FIRSTARG] = 0;
        tf->tf_fixreg[FIRSTARG + 1] = 1;
        tf->tf_cr &= ~0x10000000;
        tf->tf_srr1 &= ~(PSL_FP|PSL_VEC); /* Disable FP & AltiVec, as we can't
                                           be them. */
}
#endif

#include <powerpc/spr.h>

static void EMULNAME(syscall)(struct trapframe *);

void
EMULNAME(syscall)(struct trapframe *tf)
{
        struct lwp * const l = curlwp;
        struct proc * const p = l->l_proc;
        const struct sysent *callp;
        size_t argsize;
        register_t code;
        register_t *params, rval[2];
        register_t args[10];
        int error;
        int n;

        curcpu()->ci_ev_scalls.ev_count++;

        code = tf->tf_fixreg[0];
        params = tf->tf_fixreg + FIRSTARG;
        n = NARGREG;

        {
                switch (code) {
                case EMULNAMEU(SYS_syscall):
                        /*
                         * code is first argument,
                         * followed by actual args.
                         */
                        code = *params++;
                        n -= 1;
                        break;
#if !defined(COMPAT_LINUX)
                case EMULNAMEU(SYS___syscall):
                        params++;
                        code = *params++;
                        n -= 2;
                        break;
#endif
                default:
                        break;
                }

                code &= EMULNAMEU(SYS_NSYSENT) - 1;
                callp = p->p_emul->e_sysent + code;
        }

        argsize = callp->sy_argsize;

        if (argsize > n * sizeof(register_t)) {
                memcpy(args, params, n * sizeof(register_t));
                error = copyin(MOREARGS(tf->tf_fixreg[1]),
                    args + n,
                    argsize - n * sizeof(register_t));
                if (error)
                        goto bad;
                params = args;
        }

        error = sy_invoke(callp, l, params, rval, code);

        if (__predict_true(error == 0)) {
                tf->tf_fixreg[FIRSTARG] = rval[0];
                tf->tf_fixreg[FIRSTARG + 1] = rval[1];
                tf->tf_cr &= ~0x10000000;
        } else {
                switch (error) {
                case ERESTART:
                        /*
                         * Set user's pc back to redo the system call.
                         */
                        tf->tf_srr0 -= 4;
                        break;
                case EJUSTRETURN:
                        /* nothing to do */
                        break;
                default:
                bad:
                        if (p->p_emul->e_errno)
                                error = p->p_emul->e_errno[error];
                        tf->tf_fixreg[FIRSTARG] = error;
                        tf->tf_cr |= 0x10000000;
                        break;
                }
        }

        userret(l, tf);
}

void EMULNAME(syscall_intern)(struct proc *);

void
EMULNAME(syscall_intern)(struct proc *p)
{

        p->p_md.md_syscall = EMULNAME(syscall);
}