add procfs machine-dependent code, from Jan-Simon Pendry, jsp@sequent.com.
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/*
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* Copyright (c) 1993 The Regents of the University of California.
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* Copyright (c) 1993 Jan-Simon Pendry
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From:
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* Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel
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*
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* $Id: procfs_machdep.c,v 1.1 1994/01/05 07:41:44 cgd Exp $
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*/
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/*
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* Functions to be implemented here are:
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*
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* procfs_read_regs(proc, regs)
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* Get the current user-visible register set from the process
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* and copy it into the regs structure (<machine/reg.h>).
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* The process is stopped at the time read_regs is called.
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*
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* procfs_write_regs(proc, regs)
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* Update the current register set from the passed in regs
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* structure. Take care to avoid clobbering special CPU
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* registers or privileged bits in the PSL.
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* The process is stopped at the time write_regs is called.
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*
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* procfs_sstep(proc)
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* Arrange for the process to trap after executing a single instruction.
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*
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* procfs_fix_sstep(proc)
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* Cleanup process state after executing a single-step instruction.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/vnode.h>
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#include <machine/psl.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include <miscfs/procfs/procfs.h>
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extern int kstack[]; /* XXX */
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procfs_read_regs(p, regs)
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struct proc *p;
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struct reg *regs;
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{
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void *ptr;
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struct trapframe *tp;
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if ((p->p_flag & SLOAD) == 0)
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return (EIO);
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ptr = (char *) p->p_addr +
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((char *) p->p_regs - (char *) kstack);
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tp = ptr;
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regs->r_es = tp->tf_es;
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regs->r_ds = tp->tf_ds;
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regs->r_edi = tp->tf_edi;
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regs->r_esi = tp->tf_esi;
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regs->r_ebp = tp->tf_ebp;
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regs->r_ebx = tp->tf_ebx;
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regs->r_edx = tp->tf_edx;
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regs->r_ecx = tp->tf_ecx;
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regs->r_eax = tp->tf_eax;
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regs->r_eip = tp->tf_eip;
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regs->r_cs = tp->tf_cs;
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regs->r_eflags = tp->tf_eflags;
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regs->r_esp = tp->tf_esp;
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regs->r_ss = tp->tf_ss;
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return (0);
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}
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/*
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* Update the process's current register
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* set. Depending on the architecture this
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* may have fix-up work to do, especially
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* if the IAR or PCW are modified.
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*/
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procfs_write_regs(p, regs)
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struct proc *p;
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struct reg *regs;
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{
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void *ptr;
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struct trapframe *tp;
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int eflags;
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if ((p->p_flag & SLOAD) == 0)
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return (EIO);
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ptr = (char *)p->p_addr +
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((char *) p->p_regs - (char *) kstack);
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eflags = regs->r_eflags;
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#ifdef notdef /* BSDI's got a per-proc bitmap possible, apparently */
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if ((eflags & PSL_USERCLR) != 0 ||
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(eflags & PSL_USERSET) != PSL_USERSET ||
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(eflags & PSL_IOPL &&
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(p->p_md.md_flags & MDP_IOPL) == 0))
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return (EPERM);
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#else
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if ((eflags & PSL_USERCLR) != 0 ||
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(eflags & PSL_USERSET) != PSL_USERSET)
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return (EPERM);
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#endif
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tp = ptr;
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tp->tf_es = regs->r_es;
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tp->tf_ds = regs->r_ds;
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tp->tf_edi = regs->r_edi;
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tp->tf_esi = regs->r_esi;
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tp->tf_ebp = regs->r_ebp;
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tp->tf_ebx = regs->r_ebx;
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tp->tf_edx = regs->r_edx;
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tp->tf_ecx = regs->r_ecx;
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tp->tf_eax = regs->r_eax;
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tp->tf_eip = regs->r_eip;
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tp->tf_cs = regs->r_cs;
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tp->tf_eflags = eflags;
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tp->tf_esp = regs->r_esp;
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tp->tf_ss = regs->r_ss;
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return (0);
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}
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procfs_sstep(p)
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struct proc *p;
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{
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int error;
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struct reg r;
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error = procfs_read_regs(p, &r);
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if (error == 0) {
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r.r_eflags |= PSL_T;
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error = procfs_write_regs(p, &r);
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}
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return (error);
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}
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procfs_fix_sstep(p)
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struct proc *p;
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{
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}
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