Commit Graph

33 Commits

Author SHA1 Message Date
Peter Wemm
f41325db5f With this commit, I hereby pronounce gensetdefs past its use-by date.
Replace the a.out emulation of 'struct linker_set' with something
a little more flexible.  <sys/linker_set.h> now provides macros for
accessing elements and completely hides the implementation.

The linker_set.h macros have been on the back burner in various
forms since 1998 and has ideas and code from Mike Smith (SET_FOREACH()),
John Polstra (ELF clue) and myself (cleaned up API and the conversion
of the rest of the kernel to use it).

The macros declare a strongly typed set.  They return elements with the
type that you declare the set with, rather than a generic void *.

For ELF, we use the magic ld symbols (__start_<setname> and
__stop_<setname>).  Thanks to Richard Henderson <rth@redhat.com> for the
trick about how to force ld to provide them for kld's.

For a.out, we use the old linker_set struct.

NOTE: the item lists are no longer null terminated.  This is why
the code impact is high in certain areas.

The runtime linker has a new method to find the linker set
boundaries depending on which backend format is in use.

linker sets are still module/kld unfriendly and should never be used
for anything that may be modular one day.

Reviewed by:	eivind
2001-06-13 10:58:39 +00:00
Peter Wemm
1a5f13cfbf Manually add an extra _ to _DYNAMIC since it is provided by ld, not gcc.
Make the rest compile.
2001-02-25 07:25:05 +00:00
Doug Rabson
b99353b99e Change the conditionaal so that we only build this on i386 instead of
trying to build it on all non-alpha arches.
2000-09-29 13:32:24 +00:00
Kirk McKusick
e6796b67d9 Move the truncation code out of vn_open and into the open system call
after the acquisition of any advisory locks. This fix corrects a case
in which a process tries to open a file with a non-blocking exclusive
lock. Even if it fails to get the lock it would still truncate the
file even though its open failed. With this change, the truncation
is done only after the lock is successfully acquired.

Obtained from:	 BSD/OS
2000-07-04 03:34:11 +00:00
Poul-Henning Kamp
2c9b67a8df Remove unneeded #include <vm/vm_zone.h>
Generated by:	src/tools/tools/kerninclude
2000-04-30 18:52:11 +00:00
Peter Wemm
54823af256 First round implementation of a fine grain enhanced module to module
version dependency system.  This isn't quite finished, but it is at a
useful stage to do a functional checkpoint.

Highlights:
- version and dependency metadata is gathered via linker sets, so things
are handled the same for static kernels and code built to live in a kld.
- The dependencies are at module level (versus at file level).
- Dependencies determine kld symbol search order - this means that you
cannot link against symbols in another file unless you depend on it. This
is so that you cannot accidently unload the target out from underneath
the ones referencing it.
- It is flexible enough that we can put tags in #include files and macros
so that we can get decent hooks for enforcing recompiles on incompatable
ABI changes.  eg: if we change struct proc, we could force a recompile
for all kld's that reference the proc struct.
- Tangled dependency references at boot time are sorted.  Files are
relocated once all their dependencies are already relocated.

Caveats:
- Loader support is incomplete, but has been worked on seperately.
- Actual enforcement of the version number tags is not active yet - just
the module dependencies are live.  The actual structure of versioning
hasn't been agreed on yet. (eg: major.minor, or whatever)
- There is some backwards compatability for old modules without metadata
but I'm not sure how good it is.

This is based on work originally done by Boris Popov (bp@freebsd.org),
but I'm not sure he'd recognize much of it now. Don't blame him. :-)
Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
Doug Rabson
326e27d81f * Rewrite to use kobj(9) instead of hard-coded function tables.
* Report link errors to stdout with uprintf() so that the user can see
  what went wrong (PR kern/9214).
* Add support code to allow module symbols to be loaded into GDB using
  the debugger's "sharedlibrary" command.
2000-04-24 17:08:04 +00:00
Bruce Evans
586453fee2 Fixed a cast of a pointer to an integer of a possibly different size.
Fixed casts of non-`void *' pointers to uintptr_t.  Fixed related
style bugs.  This file uses perfectly non-KNF formatting for casts.
1999-12-24 15:33:36 +00:00
Eivind Eklund
369dc8ceb8 Change incorrect NULLs to 0s 1999-12-21 11:14:12 +00:00
Eivind Eklund
762e6b856c Introduce NDFREE (and remove VOP_ABORTOP) 1999-12-15 23:02:35 +00:00
Peter Wemm
64f86df1ed Take a shot at implementing the fix for PR 15014 for the a.out kernel
linker as well.

PR:		15014
Submitted by:	Vladimir N. Silyaev <vns@delta.odessa.ua>
1999-11-28 12:06:29 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Eivind Eklund
1d8290f3c3 Add enough include files to make this actually compile on an a.out system. 1999-05-15 23:18:32 +00:00
Peter Wemm
4173e42044 Use KERNBASE for the load address of the kernel rather than magic constants
as it seems to work..  (at least on i386/elf).
1999-05-08 13:03:49 +00:00
Matthew Dillon
8aef171243 Fix warnings in preparation for adding -Wall -Wcast-qual to the
kernel compile
1999-01-28 00:57:57 +00:00
Doug Rabson
149a155c3b Don't try to call SYSUNINIT functions if there was a link error.
Reviewed by: Peter Wemm <peter@netplex.com.au>
1999-01-25 08:42:24 +00:00
Peter Wemm
84e40f5627 The handle for the kernel is common. With this fix, ELF kernels can load
a.out kld modules, and a.out kernels can load ELF kld modules.
1998-11-04 15:20:58 +00:00
Peter Wemm
e91a7f30cf Initialize the a.out kld loader after elf, so that elf gets first shot at
a kldload attempt.
1998-11-03 14:25:21 +00:00
Poul-Henning Kamp
f5ef029e92 Nitpicking and dusting performed on a train. Removes trivial warnings
about unused variables, labels and other lint.
1998-10-25 17:44:59 +00:00
Peter Wemm
df481e793f Fix some bugs in link_aout.c caused by using uninitialized malloc space.
Pre-Approved by:  jkh
1998-10-16 03:45:35 +00:00
Peter Wemm
adbb7dbee6 Updates for KLD backends.
- symbol_values checks that the symbol is indeed belonging to the
   correct symbol and string table pairs before looking up. (since there
   could be many pairs, and KLD/DDB need to find out).
 - different ops for files versus preload modules - the unload mechanism
   is different.  (a preloaded module has to be deleted on unload since
   the in-core image is tainted by relocation and variables used)
 - Do not build an a.out kernel module if we're running on an elf
   kernel. :-)  Note that it should theoretically be possible to
   mix a.out and elf KLD modules providing -mno-underscores was used
   to compile it, or some other symbol conversion takes place.
 - Support preload modules (even though /boot/loader doesn't yet)
 - Search the module path when loading files.
1998-10-09 23:49:28 +00:00
Doug Rabson
9386468ef8 Avoid a possible memory leak. 1998-09-11 08:45:32 +00:00
John Polstra
317c91f4d4 Make ELF kernels build again. 1998-08-16 04:19:03 +00:00
Bruce Evans
86a14a7a0a Use [u]intptr_t instead of [u_]long for casts between pointers and
integers.  Don't forget to cast to (void *) as well.
1998-08-16 01:21:52 +00:00
Doug Rabson
a2c99e3e72 Modify the internal interfaces to the kernel linker to make it possible
for DDB to use its symbol tables.
1998-08-12 08:44:21 +00:00
Bruce Evans
a23d65bfc8 Cast pointers to uintptr_t/intptr_t instead of to u_long/long,
respectively.  Most of the longs should probably have been
u_longs, but this changes is just to prevent warnings about
casts between pointers and integers of different sizes, not
to fix poorly chosen types.
1998-07-15 02:32:35 +00:00
Bruce Evans
c4ebf24f6e Don't depend on gcc's feature of casting lvalues. 1998-07-07 04:36:23 +00:00
Doug Rabson
ecbb00a262 This commit fixes various 64bit portability problems required for
FreeBSD/alpha.  The most significant item is to change the command
argument to ioctl functions from int to u_long.  This change brings us
inline with various other BSD versions.  Driver writers may like to
use (__FreeBSD_version == 300003) to detect this change.

The prototype FreeBSD/alpha machdep will follow in a couple of days
time.
1998-06-07 17:13:14 +00:00
Bruce Evans
d73424aa6b Fixed a sloppy common-style definitions. 1997-11-20 20:07:59 +00:00
Poul-Henning Kamp
4a11ca4e29 Remove a bunch of variables which were unused both in GENERIC and LINT.
Found by:	-Wunused
1997-11-07 08:53:44 +00:00
John-Mark Gurney
f173e80c8b make a couple functions static...
also change module_register_static to module_register_init as this
function initalizes the module for both dynamic and static modules...
1997-10-24 05:29:07 +00:00
Bruce Evans
1fd0b0588f Removed unused #includes. 1997-08-02 14:33:27 +00:00
Doug Rabson
cea6c86c11 This is the kernel linker. To use it, you will first need to apply
the patches in freefall:/home/dfr/ld.diffs to your ld sources and set
BINFORMAT to aoutkld when linking the kernel.

Library changes and userland utilities will appear in a later commit.
1997-05-07 16:05:47 +00:00