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Mostly remove the VM_STACK OPTION.

Browse Source 
This changes the definitions of a few items so that structures are the
same whether or not the option itself is enabled. This allows
people to enable and disable the option without recompilng the world.

As the author says:

|I ran into a problem pulling out the VM_STACK option.  I was aware of this
|when I first did the work, but then forgot about it.  The VM_STACK stuff
|has some code changes in the i386 branch.  There need to be corresponding
|changes in the alpha branch before it can come out completely.

what is done:
|
|1) Pull the VM_STACK option out of the header files it appears in.  This
|really shouldn't affect anything that executes with or without the rest
|of the VM_STACK patches.  The vm_map_entry will then always have one
|extra element (avail_ssize).  It just won't be used if the VM_STACK
|option is not turned on.
|
|I've also pulled the option out of vm_map.c.  This shouldn't harm anything,
|since the routines that are enabled as a result are not called unless
|the VM_STACK option is enabled elsewhere.
|
|2) Add what appears to be appropriate code the the alpha branch, still
|protected behind the VM_STACK switch.  I don't have an alpha machine,
|so we would need to get some testers with alpha machines to try it out.
|
|Once there is some testing, we can consider making the change permanent
|for both i386 and alpha.
|
[..]
|
|Once the alpha code is adequately tested, we can pull VM_STACK out
|everywhere.
|

Submitted by:	"Richard Seaman, Jr." <dick@tar.com>
This commit is contained in:
Julian Elischer 1999-01-26 02:49:52 +00:00
parent 88c5ea4574
commit 2907af2a96
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=43209
14 changed files with 116 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
lib/libc/sys/mmap.2
View File

@ -130,6 +130,25 @@ system calls.
Modifications are private.
.It Dv MAP_SHARED
Modifications are shared.
.It Dv MAP_STACK
This option is only available if your system has been compiled with
VM_STACK defined when compiling the kernel. This is the default for
i386 only. Consider adding -DVM_STACK to COPTFLAGS in your /etc/make.conf
to enable this option for other architechures. MAP_STACK implies
MAP_ANON, and
.Fa offset
of 0.
.Fa fd
must be -1 and
.Fa prot
must include at least PROT_READ and PROT_WRITE. This option creates
a memory region that grows to at most
.Fa len
bytes in size, starting from the stack top and growing down. The
stack top is the starting address returned by the call, plus
.Fa len
bytes. The bottom of the stack at maximum growth is the starting
address returned by the call.
.El
.Pp
The

12
sys/alpha/alpha/machdep.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: machdep.c,v 1.29 1998/12/30 10:38:58 dfr Exp $
* $Id: machdep.c,v 1.30 1999/01/15 18:00:19 msmith Exp $
*/
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -1268,12 +1268,22 @@ sendsig(sig_t catcher, int sig, int mask, u_long code)
psp->ps_sigstk.ss_flags |= SS_ONSTACK;
} else
scp = (struct sigcontext *)(alpha_pal_rdusp() - rndfsize);
#ifndef VM_STACK
if ((u_long)scp <= USRSTACK - ctob(p->p_vmspace->vm_ssize))
#if defined(UVM)
(void)uvm_grow(p, (u_long)scp);
#else
(void)grow(p, (u_long)scp);
#endif
#else
/* Note: uvm_grow doesn't seem to be defined anywhere, so we don't
* know how to implement it for the VM_STACK case. Also, we would
* think that it would be wise to test for success of grow_stack,
* but we don't since there is no test for success for grow in the
* non VM_STACK case.
*/
(void)grow_stack(p, (u_long)scp);
#endif
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid,

17
sys/alpha/alpha/trap.c
View File

@ -1,4 +1,4 @@
/* $Id: trap.c,v 1.9 1998/12/16 15:21:50 bde Exp $ */
/* $Id: trap.c,v 1.10 1998/12/30 10:38:58 dfr Exp $ */
/* $NetBSD: trap.c,v 1.31 1998/03/26 02:21:46 thorpej Exp $ */
/*
@ -418,6 +418,7 @@ trap(a0, a1, a2, entry, framep)
/*
* Grow the stack if necessary
*/
#ifndef VM_STACK
if ((caddr_t)va > vm->vm_maxsaddr
&& va < USRSTACK) {
if (!grow(p, va)) {
@ -426,6 +427,20 @@ trap(a0, a1, a2, entry, framep)
goto nogo;
}
}
#else
/* grow_stack returns false only if va falls into
* a growable stack region and the stack growth
* fails. It returns true if va was not within
* a growable stack region, or if the stack
* growth succeeded.
*/
if (!grow_stack (p, va)) {
rv = KERN_FAILURE;
--p->p_lock;
goto nogo;
}
#endif
/* Fault in the user page: */
rv = vm_fault(map, va, ftype,

19
sys/alpha/alpha/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.6 1998/12/16 15:21:50 bde Exp $
* $Id: vm_machdep.c,v 1.7 1998/12/30 10:38:58 dfr Exp $
*/
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -365,6 +365,7 @@ cpu_reset()
prom_halt(0);
}
#ifndef VM_STACK
/*
* Grow the user stack to allow for 'sp'. This version grows the stack in
* chunks of SGROWSIZ.
@ -417,6 +418,22 @@ grow(p, sp)
return (1);
}
#else
int
grow_stack(p, sp)
struct proc *p;
size_t sp;
{
int rv;
rv = vm_map_growstack (p, sp);
if (rv != KERN_SUCCESS)
return (0);
return (1);
}
#endif
static int cnt_prezero;

4
sys/conf/Makefile.i386
View File

@ -1,7 +1,7 @@
# Makefile.i386 -- with config changes.
# Copyright 1990 W. Jolitz
# from: @(#)Makefile.i386 7.1 5/10/91
# $Id: Makefile.i386,v 1.136 1999/01/19 17:08:28 peter Exp $
# $Id: Makefile.i386,v 1.137 1999/01/25 04:08:28 peter Exp $
#
# Makefile for FreeBSD
#
@ -38,7 +38,7 @@ INCLUDES+= -I$S/../include
.else
INCLUDES+= -I/usr/include
.endif
COPTS= ${INCLUDES} ${IDENT} -DKERNEL -include opt_global.h
COPTS= ${INCLUDES} ${IDENT} -DKERNEL -DVM_STACK -include opt_global.h
CFLAGS= ${COPTFLAGS} ${CWARNFLAGS} ${DEBUG} ${COPTS}
# XXX LOCORE means "don't declare C stuff" not "for locore.s".

4
sys/conf/Makefile.powerpc
View File

@ -1,7 +1,7 @@
# Makefile.i386 -- with config changes.
# Copyright 1990 W. Jolitz
# from: @(#)Makefile.i386 7.1 5/10/91
# $Id: Makefile.i386,v 1.136 1999/01/19 17:08:28 peter Exp $
# $Id: Makefile.i386,v 1.137 1999/01/25 04:08:28 peter Exp $
#
# Makefile for FreeBSD
#
@ -38,7 +38,7 @@ INCLUDES+= -I$S/../include
.else
INCLUDES+= -I/usr/include
.endif
COPTS= ${INCLUDES} ${IDENT} -DKERNEL -include opt_global.h
COPTS= ${INCLUDES} ${IDENT} -DKERNEL -DVM_STACK -include opt_global.h
CFLAGS= ${COPTFLAGS} ${CWARNFLAGS} ${DEBUG} ${COPTS}
# XXX LOCORE means "don't declare C stuff" not "for locore.s".

4
sys/i386/conf/Makefile.i386
View File

@ -1,7 +1,7 @@
# Makefile.i386 -- with config changes.
# Copyright 1990 W. Jolitz
# from: @(#)Makefile.i386 7.1 5/10/91
# $Id: Makefile.i386,v 1.136 1999/01/19 17:08:28 peter Exp $
# $Id: Makefile.i386,v 1.137 1999/01/25 04:08:28 peter Exp $
#
# Makefile for FreeBSD
#
@ -38,7 +38,7 @@ INCLUDES+= -I$S/../include
.else
INCLUDES+= -I/usr/include
.endif
COPTS= ${INCLUDES} ${IDENT} -DKERNEL -include opt_global.h
COPTS= ${INCLUDES} ${IDENT} -DKERNEL -DVM_STACK -include opt_global.h
CFLAGS= ${COPTFLAGS} ${CWARNFLAGS} ${DEBUG} ${COPTS}
# XXX LOCORE means "don't declare C stuff" not "for locore.s".

19
sys/powerpc/aim/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.6 1998/12/16 15:21:50 bde Exp $
* $Id: vm_machdep.c,v 1.7 1998/12/30 10:38:58 dfr Exp $
*/
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -365,6 +365,7 @@ cpu_reset()
prom_halt(0);
}
#ifndef VM_STACK
/*
* Grow the user stack to allow for 'sp'. This version grows the stack in
* chunks of SGROWSIZ.
@ -417,6 +418,22 @@ grow(p, sp)
return (1);
}
#else
int
grow_stack(p, sp)
struct proc *p;
size_t sp;
{
int rv;
rv = vm_map_growstack (p, sp);
if (rv != KERN_SUCCESS)
return (0);
return (1);
}
#endif
static int cnt_prezero;

19
sys/powerpc/powerpc/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.6 1998/12/16 15:21:50 bde Exp $
* $Id: vm_machdep.c,v 1.7 1998/12/30 10:38:58 dfr Exp $
*/
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -365,6 +365,7 @@ cpu_reset()
prom_halt(0);
}
#ifndef VM_STACK
/*
* Grow the user stack to allow for 'sp'. This version grows the stack in
* chunks of SGROWSIZ.
@ -417,6 +418,22 @@ grow(p, sp)
return (1);
}
#else
int
grow_stack(p, sp)
struct proc *p;
size_t sp;
{
int rv;
rv = vm_map_growstack (p, sp);
if (rv != KERN_SUCCESS)
return (0);
return (1);
}
#endif
static int cnt_prezero;

4
sys/sys/mman.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)mman.h 8.2 (Berkeley) 1/9/95
* $Id: mman.h,v 1.23 1998/03/28 11:50:38 dufault Exp $
* $Id: mman.h,v 1.24 1999/01/06 23:05:40 julian Exp $
*/
#ifndef _SYS_MMAN_H_
@ -64,9 +64,7 @@
#define MAP_INHERIT 0x0080 /* region is retained after exec */
#define MAP_NOEXTEND 0x0100 /* for MAP_FILE, don't change file size */
#define MAP_HASSEMAPHORE 0x0200 /* region may contain semaphores */
#ifdef VM_STACK
#define MAP_STACK 0x0400 /* region grows down, like a stack */
#endif
#ifdef _P1003_1B_VISIBLE
/*

5
sys/vm/vm_extern.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)vm_extern.h 8.2 (Berkeley) 1/12/94
* $Id: vm_extern.h,v 1.38 1998/06/07 17:13:09 dfr Exp $
* $Id: vm_extern.h,v 1.39 1999/01/06 23:05:41 julian Exp $
*/
#ifndef _VM_EXTERN_H_
@ -61,11 +61,8 @@ int swapon __P((struct proc *, void *, int *));
#endif
void faultin __P((struct proc *p));
#ifndef VM_STACK
int grow __P((struct proc *, size_t));
#else
int grow_stack __P((struct proc *, size_t));
#endif
int kernacc __P((caddr_t, int, int));
vm_offset_t kmem_alloc __P((vm_map_t, vm_size_t));
vm_offset_t kmem_alloc_pageable __P((vm_map_t, vm_size_t));

8
sys/vm/vm_map.c
View File

@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_map.c,v 1.141 1999/01/21 09:40:48 dillon Exp $
* $Id: vm_map.c,v 1.142 1999/01/24 06:04:52 dillon Exp $
*/
/*
@ -75,9 +75,7 @@
#include <sys/vmmeter.h>
#include <sys/mman.h>
#include <sys/vnode.h>
#ifdef VM_STACK
#include <sys/resourcevar.h>
#endif
#include <vm/vm.h>
#include <vm/vm_param.h>
@ -548,9 +546,7 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
new_entry->eflags = protoeflags;
new_entry->object.vm_object = object;
new_entry->offset = offset;
#ifdef VM_STACK
new_entry->avail_ssize = 0;
#endif
if (object) {
if ((object->ref_count > 1) || (object->shadow_count != 0)) {
@ -589,7 +585,6 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
return (KERN_SUCCESS);
}
#ifdef VM_STACK
int
vm_map_stack (vm_map_t map, vm_offset_t addrbos, vm_size_t max_ssize,
vm_prot_t prot, vm_prot_t max, int cow)
@ -785,7 +780,6 @@ vm_map_growstack (struct proc *p, vm_offset_t addr)
return (rv);
}
#endif
/*
* Find sufficient space for `length' bytes in the given map, starting at

6
sys/vm/vm_map.h
View File

@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_map.h,v 1.32 1998/01/22 17:30:38 dyson Exp $
* $Id: vm_map.h,v 1.33 1999/01/06 23:05:42 julian Exp $
*/
/*
@ -102,9 +102,7 @@ struct vm_map_entry {
struct vm_map_entry *next; /* next entry */
vm_offset_t start; /* start address */
vm_offset_t end; /* end address */
#ifdef VM_STACK
vm_offset_t avail_ssize; /* amt can grow if this is a stack */
#endif
union vm_map_object object; /* object I point to */
vm_ooffset_t offset; /* offset into object */
u_char eflags; /* map entry flags */
@ -338,10 +336,8 @@ void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
void vm_init2 __P((void));
int vm_uiomove __P((vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *));
void vm_freeze_copyopts __P((vm_object_t, vm_pindex_t, vm_pindex_t));
#ifdef VM_STACK
int vm_map_stack __P((vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int));
int vm_map_growstack __P((struct proc *p, vm_offset_t addr));
#endif
#endif
#endif /* _VM_MAP_ */

9
sys/vm/vm_mmap.c
View File

@ -38,7 +38,7 @@
* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
*
* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
* $Id: vm_mmap.c,v 1.86 1999/01/06 23:05:42 julian Exp $
* $Id: vm_mmap.c,v 1.87 1999/01/21 08:29:11 dillon Exp $
*/
/*
@ -178,15 +178,18 @@ mmap(p, uap)
((flags & MAP_ANON) && uap->fd != -1))
return (EINVAL);
#ifdef VM_STACK
if (flags & MAP_STACK) {
#ifdef VM_STACK
if ((uap->fd != -1) ||
((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
return (EINVAL);
flags |= MAP_ANON;
pos = 0;
}
#else
return (EINVAL);
#endif
}
/*
* Align the file position to a page boundary,
* and save its page offset component.