Home | History | Annotate | only in /src/common/lib/libc/arch/alpha
History log of /src/common/lib/libc/arch/alpha
RevisionDateAuthorComments
 1.5 04-Jan-2009  pooka branches: 1.5.50;
allow inclusion of atomic ops in librump
 1.4 29-Sep-2008  ad Allow atomic ops to be built as part of libpthread.
 1.3 11-Feb-2008  ad Only build atomic ops for libkern/libc.
 1.2 28-Nov-2007  ad branches: 1.2.4;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file Makefile.inc was initially added on branch thorpej-atomic.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.4.3 23-Mar-2008  matt sync with HEAD
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file Makefile.inc was added on branch matt-armv6 on 2008-01-09 01:20:47 +0000
 1.5.50.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.5.50.1 21-Apr-2020  martin Sync with HEAD
 1.5 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.4 25-May-2008  chs branches: 1.4.62;
enable profiling of assembly functions.
 1.3 28-Apr-2008  martin branches: 1.3.2;
Remove clause 3 and 4 from TNF licenses
 1.2 28-Nov-2007  ad branches: 1.2.4; 1.2.8;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_add.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.8.2 04-Jun-2008  yamt sync with head
 1.2.8.1 18-May-2008  yamt sync with head.
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_add.S was added on branch matt-armv6 on 2008-01-09 01:20:47 +0000
 1.3.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.4.62.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.4.62.1 21-Apr-2020  martin Sync with HEAD
 1.5 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.4 25-May-2008  chs branches: 1.4.62;
enable profiling of assembly functions.
 1.3 28-Apr-2008  martin branches: 1.3.2;
Remove clause 3 and 4 from TNF licenses
 1.2 28-Nov-2007  ad branches: 1.2.4; 1.2.8;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_and.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.8.2 04-Jun-2008  yamt sync with head
 1.2.8.1 18-May-2008  yamt sync with head.
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_and.S was added on branch matt-armv6 on 2008-01-09 01:20:48 +0000
 1.3.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.4.62.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.4.62.1 21-Apr-2020  martin Sync with HEAD
 1.6 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.5 25-May-2008  chs branches: 1.5.62;
enable profiling of assembly functions.
 1.4 28-Apr-2008  martin branches: 1.4.2;
Remove clause 3 and 4 from TNF licenses
 1.3 10-Feb-2008  ad branches: 1.3.4;
Add atomic_cas_foo_ni().
 1.2 28-Nov-2007  ad branches: 1.2.4;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_cas.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.4.3 23-Mar-2008  matt sync with HEAD
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_cas.S was added on branch matt-armv6 on 2008-01-09 01:20:48 +0000
 1.3.4.2 04-Jun-2008  yamt sync with head
 1.3.4.1 18-May-2008  yamt sync with head.
 1.4.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.5.62.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.5.62.1 21-Apr-2020  martin Sync with HEAD
 1.5 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.4 25-May-2008  chs branches: 1.4.62;
enable profiling of assembly functions.
 1.3 28-Apr-2008  martin branches: 1.3.2;
Remove clause 3 and 4 from TNF licenses
 1.2 28-Nov-2007  ad branches: 1.2.4; 1.2.8;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_dec.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.8.2 04-Jun-2008  yamt sync with head
 1.2.8.1 18-May-2008  yamt sync with head.
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_dec.S was added on branch matt-armv6 on 2008-01-09 01:20:48 +0000
 1.3.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.4.62.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.4.62.1 21-Apr-2020  martin Sync with HEAD
 1.5 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.4 25-May-2008  chs branches: 1.4.62;
enable profiling of assembly functions.
 1.3 28-Apr-2008  martin branches: 1.3.2;
Remove clause 3 and 4 from TNF licenses
 1.2 28-Nov-2007  ad branches: 1.2.4; 1.2.8;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_inc.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.8.2 04-Jun-2008  yamt sync with head
 1.2.8.1 18-May-2008  yamt sync with head.
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_inc.S was added on branch matt-armv6 on 2008-01-09 01:20:49 +0000
 1.3.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.4.62.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.4.62.1 21-Apr-2020  martin Sync with HEAD
 1.4 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.3 28-Apr-2008  martin branches: 1.3.64;
Remove clause 3 and 4 from TNF licenses
 1.2 28-Nov-2007  ad branches: 1.2.4; 1.2.8;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_op_asm.h was initially added on branch thorpej-atomic.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.8.1 18-May-2008  yamt sync with head.
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_op_asm.h was added on branch matt-armv6 on 2008-01-09 01:20:49 +0000
 1.3.64.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.3.64.1 21-Apr-2020  martin Sync with HEAD
 1.5 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.4 25-May-2008  chs branches: 1.4.62;
enable profiling of assembly functions.
 1.3 28-Apr-2008  martin branches: 1.3.2;
Remove clause 3 and 4 from TNF licenses
 1.2 28-Nov-2007  ad branches: 1.2.4; 1.2.8;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_or.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.8.2 04-Jun-2008  yamt sync with head
 1.2.8.1 18-May-2008  yamt sync with head.
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_or.S was added on branch matt-armv6 on 2008-01-09 01:20:50 +0000
 1.3.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.4.62.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.4.62.1 21-Apr-2020  martin Sync with HEAD
 1.5 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.4 25-May-2008  chs branches: 1.4.62;
enable profiling of assembly functions.
 1.3 28-Apr-2008  martin branches: 1.3.2;
Remove clause 3 and 4 from TNF licenses
 1.2 28-Nov-2007  ad branches: 1.2.4; 1.2.8;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file atomic_swap.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.8.2 04-Jun-2008  yamt sync with head
 1.2.8.1 18-May-2008  yamt sync with head.
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file atomic_swap.S was added on branch matt-armv6 on 2008-01-09 01:20:50 +0000
 1.3.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.4.62.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.4.62.1 21-Apr-2020  martin Sync with HEAD
 1.9 09-Apr-2022  riastradh Introduce membar_acquire/release. Deprecate membar_enter/exit.

The names membar_enter/exit were unclear, and the documentation of
membar_enter has disagreed with the implementations on sparc,
powerpc, and even x86(!) for the entire time it has been in NetBSD.

The terms `acquire' and `release' are ubiquitous in the literature
today, and have been adopted in the C and C++ standards to mean
load-before-load/store and load/store-before-store, respectively,
which are exactly the orderings required by acquiring and releasing a
mutex, as well as other useful applications like decrementing a
reference count and then freeing the underlying object if it went to
zero.

Originally I proposed changing one word in the documentation for
membar_enter to make it load-before-load/store instead of
store-before-load/store, i.e., to make it an acquire barrier. I
proposed this on the grounds that

(a) all implementations guarantee load-before-load/store,
(b) some implementations fail to guarantee store-before-load/store,
and
(c) all uses in-tree assume load-before-load/store.

I verified parts (a) and (b) (except, for (a), powerpc didn't even
guarantee load-before-load/store -- isync isn't necessarily enough;
need lwsync in general -- but it _almost_ did, and it certainly didn't
guarantee store-before-load/store).

Part (c) might not be correct, however: under the mistaken assumption
that atomic-r/m/w then membar-w/rw is equivalent to atomic-r/m/w then
membar-r/rw, I only audited the cases of membar_enter that _aren't_
immediately after an atomic-r/m/w. All of those cases assume
load-before-load/store. But my assumption was wrong -- there are
cases of atomic-r/m/w then membar-w/rw that would be broken by
changing to atomic-r/m/w then membar-r/rw:

https://mail-index.netbsd.org/tech-kern/2022/03/29/msg028044.html

Furthermore, the name membar_enter has been adopted in other places
like OpenBSD where it actually does follow the documentation and
guarantee store-before-load/store, even if that order is not useful.
So the name membar_enter currently lives in a bad place where it
means either of two things -- r/rw or w/rw.

With this change, we deprecate membar_enter/exit, introduce
membar_acquire/release as better names for the useful pair (r/rw and
rw/w), and make sure the implementation of membar_enter guarantees
both what was documented _and_ what was implemented, making it an
alias for membar_sync.

While here, rework all of the membar_* definitions and aliases. The
new logic follows a rule to make it easier to audit:

membar_X is defined as an alias for membar_Y iff membar_X is
guaranteed by membar_Y.

The `no stronger than' relation is (the transitive closure of):

- membar_consumer (r/r) is guaranteed by membar_acquire (r/rw)
- membar_producer (w/w) is guaranteed by membar_release (rw/w)
- membar_acquire (r/rw) is guaranteed by membar_sync (rw/rw)
- membar_release (rw/w) is guaranteed by membar_sync (rw/rw)

And, for the deprecated membars:

- membar_enter (whether r/rw, w/rw, or rw/rw) is guaranteed by
membar_sync (rw/rw)
- membar_exit (rw/w) is guaranteed by membar_release (rw/w)

(membar_exit is identical to membar_release, but the name is
deprecated.)

Finally, while here, annotate some of the instructions with their
semantics. For powerpc, leave an essay with citations on the
unfortunate but -- as far as I can tell -- necessary decision to use
lwsync, not isync, for membar_acquire and membar_consumer.

Also add membar(3) and atomic(3) man page links.
 1.8 06-Apr-2022  riastradh Nix trailing whitespace in files of membars, atomics, and lock stubs.

Will be touching many of these files soon for functional changes.

No functional change intended.
 1.7 08-Jan-2015  riastradh branches: 1.7.16;
Introduce membar_datadep_consumer.

Discussed briefly on tech-kern without objection:

https://mail-index.netbsd.org/tech-kern/2014/11/20/msg018054.html
https://mail-index.netbsd.org/tech-kern/2015/01/07/msg018326.html
 1.6 25-May-2008  chs branches: 1.6.40;
enable profiling of assembly functions.
 1.5 28-Apr-2008  martin branches: 1.5.2;
Remove clause 3 and 4 from TNF licenses
 1.4 12-Feb-2008  ad branches: 1.4.4;
Always enable memory barriers in userspace, otherwise libpthread won't
work correctly on MP systems.
 1.3 12-Feb-2008  matt Fix pthread problem. (export membar* to userland)
 1.2 28-Nov-2007  ad branches: 1.2.4;
Pull in alpha atomic ops from the thorpej-atomic branch.
 1.1 18-Apr-2007  thorpej branches: 1.1.2;
file membar_ops.S was initially added on branch thorpej-atomic.
 1.1.2.2 22-Apr-2007  thorpej Make sure namespace-cleansed aliases are avaialble for all atomic ops.
 1.1.2.1 18-Apr-2007  thorpej Atomic op implementation for Alpha.
 1.2.4.3 23-Mar-2008  matt sync with HEAD
 1.2.4.2 09-Jan-2008  matt sync with HEAD
 1.2.4.1 28-Nov-2007  matt file membar_ops.S was added on branch matt-armv6 on 2008-01-09 01:20:51 +0000
 1.4.4.2 04-Jun-2008  yamt sync with head
 1.4.4.1 18-May-2008  yamt sync with head.
 1.5.2.1 23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.6.40.1 18-Mar-2015  snj Pull up following revision(s) (requested by riastradh in ticket #600):
common/lib/libc/arch/alpha/atomic/membar_ops.S: revision 1.7
lib/libc/atomic/membar_ops.3: revision 1.4
sys/arch/alpha/include/types.h: revision 1.50
sys/sys/atomic.h: revision 1.13
Introduce membar_datadep_consumer.
Discussed briefly on tech-kern without objection:
https://mail-index.netbsd.org/tech-kern/2014/11/20/msg018054.html
https://mail-index.netbsd.org/tech-kern/2015/01/07/msg018326.html
 1.7.16.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.7.16.1 21-Apr-2020  martin Sync with HEAD
 1.3 16-Feb-2008  apb branches: 1.3.70;
For all files under src/common, as well as related man pages under
src/lib/libc, or related headers under src/sys/sys: change u_intNN_t to
uintNN_t.
 1.2 27-Dec-2005  yamt branches: 1.2.6; 1.2.18;
make alpha kernel buildable again.
don't add __ prefix to bswap{16,32}
if defined(_KERNEL) || defined(_STANDALONE).
 1.1 20-Dec-2005  christos Merge libkern + libc common files. As requested by core.
 1.2.18.1 23-Mar-2008  matt sync with HEAD
 1.2.6.1 18-Nov-2008  snj Pull up following revision(s) (requested by tsutsui in ticket #1224):
common/lib/libc/gen/bswap64.c: revision 1.2
common/lib/libprop/prop_data.c: revision 1.10
common/lib/libc/inet/inet_addr.c: revision 1.2
common/lib/libc/hash/rmd160/rmd160.c: revision 1.4
common/lib/libc/gen/bswap32.c: revision 1.2
common/lib/libc/gen/bswap16.c: revision 1.2
common/lib/libc/arch/alpha/gen/byte_swap_4.S: revision 1.3
common/lib/libc/arch/sh3/string/memset.S: revision 1.2
common/lib/libc/arch/alpha/gen/byte_swap_2.S: revision 1.3
common/lib/libc/md/md5c.c: revision 1.3
common/lib/libc/hash/sha1/sha1.c: revision 1.3
common/lib/libc/md/md4c.c: revision 1.3
sys/sys/rmd160.h: revision 1.2
sys/sys/sha2.h: revision 1.2
For all files under src/common, as well as related man pages under
src/lib/libc, or related headers under src/sys/sys: change u_intNN_t to
uintNN_t.
 1.3.70.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.3.70.1 21-Apr-2020  martin Sync with HEAD
 1.3 16-Feb-2008  apb branches: 1.3.70;
For all files under src/common, as well as related man pages under
src/lib/libc, or related headers under src/sys/sys: change u_intNN_t to
uintNN_t.
 1.2 27-Dec-2005  yamt branches: 1.2.6; 1.2.18;
make alpha kernel buildable again.
don't add __ prefix to bswap{16,32}
if defined(_KERNEL) || defined(_STANDALONE).
 1.1 20-Dec-2005  christos Merge libkern + libc common files. As requested by core.
 1.2.18.1 23-Mar-2008  matt sync with HEAD
 1.2.6.1 18-Nov-2008  snj Pull up following revision(s) (requested by tsutsui in ticket #1224):
common/lib/libc/gen/bswap64.c: revision 1.2
common/lib/libprop/prop_data.c: revision 1.10
common/lib/libc/inet/inet_addr.c: revision 1.2
common/lib/libc/hash/rmd160/rmd160.c: revision 1.4
common/lib/libc/gen/bswap32.c: revision 1.2
common/lib/libc/gen/bswap16.c: revision 1.2
common/lib/libc/arch/alpha/gen/byte_swap_4.S: revision 1.3
common/lib/libc/arch/sh3/string/memset.S: revision 1.2
common/lib/libc/arch/alpha/gen/byte_swap_2.S: revision 1.3
common/lib/libc/md/md5c.c: revision 1.3
common/lib/libc/hash/sha1/sha1.c: revision 1.3
common/lib/libc/md/md4c.c: revision 1.3
sys/sys/rmd160.h: revision 1.2
sys/sys/sha2.h: revision 1.2
For all files under src/common, as well as related man pages under
src/lib/libc, or related headers under src/sys/sys: change u_intNN_t to
uintNN_t.
 1.3.70.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.3.70.1 21-Apr-2020  martin Sync with HEAD
 1.2 21-Dec-2005  christos branches: 1.2.94;
Only build this if GPROF && !_STANDALONE
 1.1 20-Dec-2005  christos Merge libkern + libc common files. As requested by core.
 1.2.94.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.2.94.1 21-Apr-2020  martin Sync with HEAD
 1.1 20-Dec-2005  christos branches: 1.1.94;
Merge libkern + libc common files. As requested by core.
 1.1.94.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.1.94.1 21-Apr-2020  martin Sync with HEAD
 1.1 20-Dec-2005  christos branches: 1.1.94;
Merge libkern + libc common files. As requested by core.
 1.1.94.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.1.94.1 21-Apr-2020  martin Sync with HEAD
 1.1 20-Dec-2005  christos branches: 1.1.94;
Merge libkern + libc common files. As requested by core.
 1.1.94.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.1.94.1 21-Apr-2020  martin Sync with HEAD
 1.1 20-Dec-2005  christos branches: 1.1.94;
Merge libkern + libc common files. As requested by core.
 1.1.94.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.1.94.1 21-Apr-2020  martin Sync with HEAD
 1.1 20-Dec-2005  christos branches: 1.1.94;
Merge libkern + libc common files. As requested by core.
 1.1.94.2 21-Apr-2020  martin Ooops, restore accidently removed files from merge mishap
 1.1.94.1 21-Apr-2020  martin Sync with HEAD

RSS XML Feed