mirror of
https://github.com/opnsense/src.git
synced 2026-06-09 00:32:25 -04:00
Add page fault and high level tsb miss handlers.
This commit is contained in:
Jake Burkholder
parent
a5f2d2a0eb
commit
e15d0e4cf9
1 changed files with 159 additions and 3 deletions
|
|
@ -1,3 +1,42 @@
|
|||
/*-
|
||||
* Copyright (C) 1994, David Greenman
|
||||
* Copyright (c) 1990, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to Berkeley by
|
||||
* the University of Utah, and William Jolitz.
|
||||
*
|
||||
* 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: @(#)trap.c 7.4 (Berkeley) 5/13/91
|
||||
* from: FreeBSD: src/sys/i386/i386/trap.c,v 1.197 2001/07/19
|
||||
*/
|
||||
/*-
|
||||
* Copyright (c) 2001 Jake Burkholder.
|
||||
* All rights reserved.
|
||||
|
|
@ -37,8 +76,11 @@
|
|||
#include <sys/user.h>
|
||||
|
||||
#include <vm/vm.h>
|
||||
#include <vm/pmap.h>
|
||||
#include <vm/vm_extern.h>
|
||||
#include <vm/vm_param.h>
|
||||
#include <vm/vm_kern.h>
|
||||
#include <vm/vm_map.h>
|
||||
#include <vm/vm_page.h>
|
||||
|
||||
#include <machine/frame.h>
|
||||
|
|
@ -50,6 +92,7 @@
|
|||
#include <machine/tsb.h>
|
||||
|
||||
void trap(struct trapframe *tf);
|
||||
int trap_mmu_fault(struct proc *p, struct trapframe *tf);
|
||||
|
||||
const char *trap_msg[] = {
|
||||
"reserved",
|
||||
|
|
@ -93,7 +136,10 @@ trap(struct trapframe *tf)
|
|||
int ucode;
|
||||
int sig;
|
||||
|
||||
p = curproc;
|
||||
KASSERT(PCPU_GET(curproc) != NULL, ("trap: curproc NULL"));
|
||||
KASSERT(PCPU_GET(curpcb) != NULL, ("trap: curpcb NULL"));
|
||||
|
||||
p = PCPU_GET(curproc);
|
||||
ucode = tf->tf_type; /* XXX */
|
||||
|
||||
mtx_lock_spin(&sched_lock);
|
||||
|
|
@ -105,16 +151,21 @@ trap(struct trapframe *tf)
|
|||
if (fp_enable_proc(p))
|
||||
goto user;
|
||||
else {
|
||||
sig = SIGFPE;
|
||||
sig = SIGFPE;
|
||||
goto trapsig;
|
||||
}
|
||||
break;
|
||||
#ifdef DDB
|
||||
case T_BREAKPOINT | T_KERNEL:
|
||||
if (kdb_trap(tf) != 0)
|
||||
return;
|
||||
goto out;
|
||||
break;
|
||||
#endif
|
||||
case T_DMMU_MISS | T_KERNEL:
|
||||
case T_DMMU_PROT | T_KERNEL:
|
||||
if (trap_mmu_fault(p, tf) == 0)
|
||||
goto out;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
|
@ -135,3 +186,108 @@ user:
|
|||
out:
|
||||
return;
|
||||
}
|
||||
|
||||
int
|
||||
trap_mmu_fault(struct proc *p, struct trapframe *tf)
|
||||
{
|
||||
struct mmuframe *mf;
|
||||
struct vmspace *vm;
|
||||
vm_offset_t va;
|
||||
vm_prot_t type;
|
||||
int flags;
|
||||
int rv;
|
||||
|
||||
KASSERT(p->p_vmspace != NULL, ("trap_dmmu_miss: vmspace NULL"));
|
||||
|
||||
rv = KERN_FAILURE;
|
||||
mf = tf->tf_arg;
|
||||
va = TLB_TAR_VA(mf->mf_tar);
|
||||
switch (tf->tf_type) {
|
||||
case T_DMMU_MISS | T_KERNEL:
|
||||
/*
|
||||
* If the context is not nucleus, this is a fault on
|
||||
* non-kernel virtual memory.
|
||||
*/
|
||||
if (TLB_TAR_CTX(mf->mf_tar) != TLB_CTX_KERNEL &&
|
||||
PCPU_GET(curpcb)->pcb_onfault == NULL)
|
||||
break;
|
||||
|
||||
/*
|
||||
* First try the tsb. The primary tsb was already searched.
|
||||
*/
|
||||
vm = p->p_vmspace;
|
||||
if (tsb_miss(&vm->vm_pmap, tf->tf_type, mf) == 0) {
|
||||
rv = KERN_SUCCESS;
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Not found, call the vm system.
|
||||
*/
|
||||
|
||||
/*
|
||||
* XXX!!!
|
||||
*/
|
||||
type = VM_PROT_READ;
|
||||
flags = VM_FAULT_NORMAL;
|
||||
|
||||
/*
|
||||
* Keep the process from being swapped out at this critical
|
||||
* time.
|
||||
*/
|
||||
PROC_LOCK(p);
|
||||
++p->p_lock;
|
||||
PROC_UNLOCK(p);
|
||||
|
||||
/*
|
||||
* Grow the stack if necessary. vm_map_growstack only fails
|
||||
* if the va falls into a growable stack region and the stack
|
||||
* growth fails. If it succeeds, or the va was not within a
|
||||
* growable stack region, fault in the user page.
|
||||
*/
|
||||
if (vm_map_growstack(p, va) != KERN_SUCCESS)
|
||||
rv = KERN_FAILURE;
|
||||
else
|
||||
rv = vm_fault(&vm->vm_map, va, type, flags);
|
||||
|
||||
/*
|
||||
* Now the process can be swapped again.
|
||||
*/
|
||||
PROC_LOCK(p);
|
||||
--p->p_lock;
|
||||
PROC_UNLOCK(p);
|
||||
break;
|
||||
case T_DMMU_PROT | T_KERNEL:
|
||||
/*
|
||||
* If the context is not nucleus, this is a fault on
|
||||
* non-kernel virtual memory.
|
||||
*/
|
||||
if (TLB_TAR_CTX(mf->mf_tar) != TLB_CTX_KERNEL &&
|
||||
PCPU_GET(curpcb)->pcb_onfault == NULL)
|
||||
break;
|
||||
|
||||
/*
|
||||
* Only look in the tsb. Write access to an unmapped page
|
||||
* causes a miss first, so the page must have already been
|
||||
* brought in by vm_fault, we just need to find the tte and
|
||||
* update the write bit. XXX How do we tell them vm system
|
||||
* that we are now writing?
|
||||
*/
|
||||
vm = p->p_vmspace;
|
||||
if (tsb_miss(&vm->vm_pmap, tf->tf_type, mf) == 0)
|
||||
rv = KERN_SUCCESS;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
if (rv == KERN_SUCCESS)
|
||||
return (0);
|
||||
if (tf->tf_type & T_KERNEL) {
|
||||
if (PCPU_GET(curpcb)->pcb_onfault != NULL) {
|
||||
tf->tf_tpc = PCPU_GET(curpcb)->pcb_onfault;
|
||||
tf->tf_tnpc = tf->tf_tpc + 4;
|
||||
return (0);
|
||||
}
|
||||
}
|
||||
return (rv == KERN_PROTECTION_FAILURE ? SIGBUS : SIGSEGV);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue