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add procfs machine-dependent code, from Jan-Simon Pendry, jsp@sequent.com.

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cgd 1994-01-05 07:41:44 +00:00
parent 2fa59a6b60
commit 8e1f0c6b2f
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sys/arch/i386/i386/procfs_machdep.c Normal file
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/*
* 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. 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
*
* $Id: procfs_machdep.c,v 1.1 1994/01/05 07:41:44 cgd 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_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>
extern int kstack[]; /* XXX */
procfs_read_regs(p, regs)
struct proc *p;
struct reg *regs;
{
void *ptr;
struct trapframe *tp;
if ((p->p_flag & SLOAD) == 0)
return (EIO);
ptr = (char *) p->p_addr +
((char *) p->p_regs - (char *) kstack);
tp = ptr;
regs->r_es = tp->tf_es;
regs->r_ds = tp->tf_ds;
regs->r_edi = tp->tf_edi;
regs->r_esi = tp->tf_esi;
regs->r_ebp = tp->tf_ebp;
regs->r_ebx = tp->tf_ebx;
regs->r_edx = tp->tf_edx;
regs->r_ecx = tp->tf_ecx;
regs->r_eax = tp->tf_eax;
regs->r_eip = tp->tf_eip;
regs->r_cs = tp->tf_cs;
regs->r_eflags = tp->tf_eflags;
regs->r_esp = tp->tf_esp;
regs->r_ss = tp->tf_ss;
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.
*/
procfs_write_regs(p, regs)
struct proc *p;
struct reg *regs;
{
void *ptr;
struct trapframe *tp;
int eflags;
if ((p->p_flag & SLOAD) == 0)
return (EIO);
ptr = (char *)p->p_addr +
((char *) p->p_regs - (char *) kstack);
eflags = regs->r_eflags;
#ifdef notdef /* BSDI's got a per-proc bitmap possible, apparently */
if ((eflags & PSL_USERCLR) != 0 ||
(eflags & PSL_USERSET) != PSL_USERSET ||
(eflags & PSL_IOPL &&
(p->p_md.md_flags & MDP_IOPL) == 0))
return (EPERM);
#else
if ((eflags & PSL_USERCLR) != 0 ||
(eflags & PSL_USERSET) != PSL_USERSET)
return (EPERM);
#endif
tp = ptr;
tp->tf_es = regs->r_es;
tp->tf_ds = regs->r_ds;
tp->tf_edi = regs->r_edi;
tp->tf_esi = regs->r_esi;
tp->tf_ebp = regs->r_ebp;
tp->tf_ebx = regs->r_ebx;
tp->tf_edx = regs->r_edx;
tp->tf_ecx = regs->r_ecx;
tp->tf_eax = regs->r_eax;
tp->tf_eip = regs->r_eip;
tp->tf_cs = regs->r_cs;
tp->tf_eflags = eflags;
tp->tf_esp = regs->r_esp;
tp->tf_ss = regs->r_ss;
return (0);
}
procfs_sstep(p)
struct proc *p;
{
int error;
struct reg r;
error = procfs_read_regs(p, &r);
if (error == 0) {
r.r_eflags |= PSL_T;
error = procfs_write_regs(p, &r);
}
return (error);
}
procfs_fix_sstep(p)
struct proc *p;
{
}