[unix-history] / usr / src / sys / hp300 / hp300 / procfs_machdep.c

/*
* Copyright (c) 1993
*      The Regents of the University of California.  All rights reserved.
* Copyright (c) 1993 Jan-Simon Pendry
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* %sccs.include.redist.c%
*
*      @(#)procfs_machdep.c    8.3 (Berkeley) %G%
*
* From:
*      $Id: procfs_i386.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
*/

/*
* Functions to be implemented here are:
*
* procfs_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.
*
* procfs_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.
*
* procfs_read_fpregs, procfs_write_fpregs
*      deal with the floating point register set, otherwise as above.
*
* procfs_sstep(proc)
*      Arrange for the process to trap after executing a single instruction.
*
* procfs_fix_sstep(proc)
*      Cleanup process state after executing a single-step instruction.
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.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 <miscfs/procfs/procfs.h>

int
procfs_read_regs(p, regs)
       struct proc *p;
       struct reg *regs;
{
       struct frame *f;

       if ((p->p_flag & P_INMEM) == 0)
               return (EIO);

       f = (struct frame *) p->p_md.md_regs;
       bcopy((void *) f->f_regs, (void *) regs->r_regs, sizeof(regs->r_regs));
       regs->r_pc = f->f_pc;
       regs->r_sr = f->f_sr;

       return (0);
}

/*
* Update the process's current register
* set.  Depending on the architecture this
* may have fix-up work to do, especially
* if the IAR or PCW are modified.
*/
int
procfs_write_regs(p, regs)
       struct proc *p;
       struct reg *regs;
{
       struct frame *f;

       if ((p->p_flag & P_INMEM) == 0)
               return (EIO);

       f = (struct frame *) p->p_md.md_regs;
       bcopy((void *) regs->r_regs, (void *) f->f_regs, sizeof(f->f_regs));
       f->f_pc = regs->r_pc;
       f->f_sr = regs->r_sr;

       return (0);
}

int
procfs_read_fpregs(p, fpregs)
       struct proc *p;
       struct fpreg *fpregs;
{

       return (EOPNOTSUPP);
}

int
procfs_write_fpregs(p, fpregs)
       struct proc *p;
       struct fpreg *fpregs;
{

       return (EOPNOTSUPP);
}


int
procfs_sstep(p)
       struct proc *p;
{
       int error;
       struct reg r;

       error = procfs_read_regs(p, &r);
       if (error == 0) {
               r.r_sr |= PSL_T;
               error = procfs_write_regs(p, &r);
       }

       return (error);
}

void
procfs_fix_sstep(p)
       struct proc *p;
{
}