/*      $OpenBSD: process_machdep.c,v 1.15 2024/03/29 21:14:31 miod Exp $       */
/*      $NetBSD: process_machdep.c,v 1.10 2000/09/26 22:05:50 eeh Exp $ */

/*
 * Copyright (c) 1993 The Regents of the University of California.
 * 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. 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
 */

/*
 * This file may seem a bit stylized, but that so that it's easier to port.
 * Functions to be implemented here are:
 *
 * process_read_regs(proc, regs)
 *      Get the current user-visible register set from the process
 *      and copy it into the regs structure (<machine/reg.h>).
 *      The process is stopped at the time read_regs is called.
 *
 * process_write_regs(proc, regs)
 *      Update the current register set from the passed in regs
 *      structure.  Take care to avoid clobbering special CPU
 *      registers or privileged bits in the PSL.
 *      The process is stopped at the time write_regs is called.
 *
 * process_sstep(proc)
 *      Arrange for the process to trap after executing a single instruction.
 *
 * process_set_pc(proc)
 *      Set the process's program counter.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/vnode.h>
#include <machine/psl.h>
#include <machine/reg.h>
#include <machine/frame.h>
#include <sys/ptrace.h>

/* Unfortunately we need to convert struct trapframe to struct reg */
int
process_read_regs(struct proc *p, struct reg *regs)
{
        struct trapframe *tf = p->p_md.md_tf;
        int i;

        /* copy out regs */
        regs->r_tstate = tf->tf_tstate;
        regs->r_pc = tf->tf_pc;
        regs->r_npc = tf->tf_npc;
        regs->r_y = tf->tf_y;
        for (i = 0; i < 8; i++) {
                regs->r_global[i] = tf->tf_global[i];
                regs->r_out[i] = tf->tf_out[i];
                regs->r_local[i] = tf->tf_local[i];
                regs->r_in[i] = tf->tf_in[i];
        }
        return (0);
}

int
process_read_fpregs(struct proc *p, struct fpreg *regs)
{
        extern const struct fpstate initfpstate;
        const struct fpstate *statep = &initfpstate;

        /* NOTE: struct fpreg == struct fpstate */
        if (p->p_md.md_fpstate) {
                fpusave_proc(p, 1);
                statep = p->p_md.md_fpstate;
        }

        /* copy in fregs */
        bcopy(statep, regs, sizeof(struct fpreg));
        return 0;
}

#ifdef PTRACE

int
process_write_regs(struct proc *p, struct reg *regs)
{
        struct trapframe *tf = p->p_md.md_tf;
        int i;

        /* copy in regs */
        tf->tf_pc = regs->r_pc;
        tf->tf_npc = regs->r_npc;
        tf->tf_y = regs->r_y;
        for (i = 0; i < 8; i++) {
                tf->tf_global[i] = regs->r_global[i];
                tf->tf_out[i] = regs->r_out[i];
        }
        /* We should also read in the ins and locals.  See signal stuff */
        tf->tf_tstate = (tf->tf_tstate & ~TSTATE_CCR) | 
                (regs->r_tstate & TSTATE_CCR);
        return (0);
}

#ifdef PT_STEP
int
process_sstep(struct proc *p, int sstep)
{
        if (sstep)
                return EINVAL;
        return (0);
}
#endif

int
process_set_pc(struct proc *p, caddr_t addr)
{
        p->p_md.md_tf->tf_pc = (vaddr_t)addr;
        p->p_md.md_tf->tf_npc = (vaddr_t)addr + 4;
        return (0);
}

int
process_write_fpregs(struct proc *p, struct fpreg *regs)
{
        if (p->p_md.md_fpstate == NULL) {
                p->p_md.md_fpstate = malloc(sizeof(struct fpstate),
                    M_SUBPROC, M_WAITOK);
        } else
                fpusave_proc(p, 1);

        /* copy in fregs */
        bcopy(regs, p->p_md.md_fpstate, sizeof(struct fpreg));
        return 0;
}

#endif  /* PTRACE */

register_t
process_get_wcookie(struct proc *p)
{
        return p->p_addr->u_pcb.pcb_wcookie;
}