John Dyson to make it reliably work under FreeBSD.
2) Added and enabled PROCFS in the GENERICxx and LINT kernels.
3) New execve() from me. Still work to be done here, but this version
works well and is needed before other changes can be made. For
a description of the design behind this, see freebsd-arch or
ask me.
4) Rewrote stack fault code; made user stack VM grow as needed rather
than all up front; improves performance a little and reduces
process memory requirements.
5) Incorporated fix from Gene Stark to fault/wire a user page table
page to fix a problem in copyout. This is a temporary fix and
is not appropriate for pageable page tables. For a description
of the problem, see Gene's post to the freebsd-hackers mailing
list.
6) Tighten up vm_page struct to reduce memory requirements for it. ifdef
pager page lock code as it's not being used currently.
7) Introduced new element to vmspace struct - vm_minsaddr; initial
(minimum) stack address. Compliment to vm_maxsaddr.
8) Added a panic if the allocation for process u-pages fails.
9) Improve performance and accuracy of kernel profiling by putting in
a little inline assembly instead of spl().
10) Made serial console with sio driver work. Still has problems with
serial input, but is almost useable.
11) Added -Bstatic to SYSTEM_LD in Makefile.i386 so that kernels will
build properly with the new ld.
added to probe.
2) Force CLOCAL=on for outgoing ports and CLOCAL=off for
incoming ports into open in bidirectional case.
3) Add DELAY after writing to com_ier for fifo drain into probe.
The following patch adds the addr argument to signal handlers.
The kernel with the patch is no more and no less in compliance or in
violation of POSIX and ANSI C than the kernel before the patch.
The added functionality this addr argument provides is quite useful. It
enables an entire class of algorithms which use mprotect to trace memory
references. Beside garbage collectors, I have heard of this technique being
applied to debuggers and profilers. The only benchmarking I've performed is
using akcl to compile maxima: without the kernel patch, it takes 7 hours to
compile maxima, while with stratified garbage collection, it only takes 50
minutes.
Basically, I can't think of a reason not to add the addr argument and there
is a compelling need for it.
If you find the patch acceptable, please let me know so I can send my
FreeBSD akcl config files to wfs for inclusion in the core akcl release.
The old 386BSD config files there won't work on either NetBSD or FreeBSD.
From: <dec@lazarus.nrtc.northrop.com>
Changes between EPSILON and RELEASE of FreeBSD have again caused
the kernel to not see my floppy disk drives. I don't know what happened,
'cause I don't see any changes to fd.c, but here is an old fix that
I have applied to the probe routine which will solve the problem (at
least for me). Since this is a rather brute-force solution - I understand
if you want to ignore it...
[Upgrading to pre-Beta FreeBSD caused this on my system. -AM]
You write that
LDFLAGS+= -Xlinker -Bstatic
no more needed, but you have
CFLAGS += -static -I$(.CURDIR) -I$(.CURDIR)/$(MACHINE)
This -static doesn't make any sense in your version,
because it not passed to linker's state (LDFLAGS),
so we have SHARED /usr/bin/ld in this case.
(Older Makefile produce non-shared ld).
I suppose, that -static in CFLAGS was introduced to
make non-shared ld, so I restore previous LDFLAGS
to have non-shared ld. If we want to have shared ld
we need to remove -static from CFLAGS too, not only LDFLAGS,
but this need special issue and corresponding
commit log. Your current version hang into intermediate
state (beetween two sides), so I move it to one side.
Second, I restore NOPIC dependance again from older Makefile:
.if !defined(NOPIC)
SUBDIR+= rtld
.endif
We don't need ld.so, if NOPIC
P.S. I don't see any purpose to commit new makefile, old version
is better.
Subject: Bug & Fix for etc/Makefile cpio-floppy: re /tmp creation.
Date: Fri, 26 Nov 1993 11:35:04 +0100
Editors Note: tmp was listed in the CPIO_FILES section and thus the
entire contents of ${DESTDIR}/tmp would end up on the cpio floppy. This fix
moves tmp to CPIO_DIRS so that no longer happens.
* merged in Garrett Wollman's strict prototype changes
*
* Revision 2.15 1993/11/29 16:32:58 davidg
* From Thomas Sandford <t.d.g.sandford@comp.brad.ac.uk>
* Add support for the 8013W board type
Subject: Page fault in PTE area fails in copyout
Index: sys/i386/i386/trap.c FreeBSD-1.0.2
Description:
Reading files of several megabytes into Emacs, or many small
files all at once, would fail with "IO error - bad address".
Repeat-By:
The bug can be exercised by a test program that malloc()'s
a 5MB chunk of memory, and then, without accessing the memory
first, filling it with data from a file using read().
(I read 64k chunks from /dev/wd0d into successive 64k regions
of the 5MB chunk.) The read() will fail with EFAULT at the first
virtual address boundary that is a multiple of 0x400000.
Fix:
The problem was code in sys/i386/i386/trap.c that tries to
figure out what kind of trap occurred and to handle it appropriately.
It was interpreting any page fault with virtual address
>= vm->vm_maxsaddr as being a user stack segment fault.
In fact, addresses >= USRSTACK are in the user structure/PTE area,
and if they are handled as stack faults, the proper PTE will
not be paged in when it is supposed to be. This situation comes
up in copyout() and copyoutstr(), if PTE's are accessed for the
first time ever. The page fault on accessing the nonexistent PTE
is mishandled as a stack fault, and then the fault that occurs on
the subsequent access to the page itself causes copyout to fail
with EFAULT.
