cinap_lenrek [Tue, 4 Jun 2013 20:11:01 +0000 (22:11 +0200)]
libaml: various fixes found by plhk
- fix bogus execution of Else{} blocks
- always allocate Env in amleval()
- add Sleep() and Stall() instructions
- keep package size for packages with empty body
cinap_lenrek [Mon, 3 Jun 2013 21:49:06 +0000 (23:49 +0200)]
time: fix -older t for relative times to current time (thanks arisawa for pointing out)
from test(1):
f -older t True if file f is older than (modified before)
time t. If t is a integer followed by the letters
y(years), M(months), d(days), h(hours),
m(minutes), or s(seconds), it represents current
time minus the specified time. If there is no
letter, it represents seconds since epoch. You
can also concatenate mixed units. For example,
3d12h means three days and twelve hours ago.
this means *without* [y M d h m s] unit, t is *absolute* time
in seconds since epoch.
ppatience0 [Sat, 1 Jun 2013 21:14:50 +0000 (17:14 -0400)]
readgif, readjpg: fix incorrect malloc arguments: use sizeof(Rawimage*) instead of sizeof(Rawimage**) and 2*sizeof(Rawimage*) instead of sizeof(Header)
readtga: switch calloc arguments: nelem is supposed to first, elsize second
cinap_lenrek [Sat, 1 Jun 2013 16:51:47 +0000 (18:51 +0200)]
8c: apply charles forsyth's 8c-cgen64-mul-savereg patch (from sources)
If 64-bit multiply has to save both AX and DX, it could load the wrong value
into DX; also, biggen shouldn't allocate either AX or DX as temporaries
when using the template for MUL.
cinap_lenrek [Sat, 1 Jun 2013 14:14:53 +0000 (16:14 +0200)]
inst/ndbsetup: allow setting sysname more than once
In the installation, if you run the ndbsetup task n times (n > 1),
the installed /lib/ndb/local will have n sys= entries.
The problem is that ndb(8) will use the first sys= entry found, but
one would expect that the last configuration in the ndbsetup task
would be the active one.
Remove any previous entry in ndbsetup before adding new one.
cinap_lenrek [Thu, 30 May 2013 21:26:21 +0000 (23:26 +0200)]
kernel: do all fp state fork from procfork() (like pc kernel)
this simplifies the arm ports and keeps all the stuff in one place
instead of spreading it thru notify(), trap() and syscall() functions
and prevents useless fp state copying for kernel procs.
also make sure to save fp in notify while still splhi().
cinap_lenrek [Thu, 30 May 2013 21:16:22 +0000 (23:16 +0200)]
pc kernel: simulate FXSAVE/FXRSTOR tag-byte from x87 tag-word, copy fp state across fork
the tag-word is not compatible between x87 and sse, have to convert
properly for emulation to work.
we now copy fp state across fork (again!) to preserve FCW and MXCSR
registers. this might not be neccesary as we could probably just
get the current value for the curren process and avoid the fpsave()
call, but become conservative again.
ppatience0 [Mon, 27 May 2013 04:26:19 +0000 (00:26 -0400)]
mothra: clicking on the url scroll bar, snarfing, or saving a hit when no urls have been loaded (right after running mothra) would crash. this was due to use of w->url and selection when they are actually nil.
to fix this, make genwww return 0 if w->url is nil and output an error message when attempting to access selection if it's nil. the problem with the w->url fix is that after clicking on the url scroll bar, an empty url history row could be highlighted by clicking on it. fix this by making sure lp->lo is not less than zero.
cinap_lenrek [Tue, 28 May 2013 21:41:54 +0000 (23:41 +0200)]
kernel: sysrfork abortion
when we fail to fork resources for the child due to resource
exhaustion, make the half forked child process call pexit()
to free the resources that where allocated and error out.
cinap_lenrek [Mon, 27 May 2013 01:26:53 +0000 (03:26 +0200)]
kernel: make imagereclaim() skip notext pages (prevent it from blowing the mount cache)
imagereclaim would happily uncache pages from the mountcache (port/cache.c)
without ever getting a Image* released from it. simple fix, just check for
p->image->notext but make sure todo it under the page lock :)
cinap_lenrek [Sun, 26 May 2013 23:12:21 +0000 (01:12 +0200)]
devfs/devsd: fix waserror() and unused variable compiler problem
the compiler optimizes setting unused variables out, which is
problematic if they are used in waserror() handler which the
compiler isnt aware of. rearrange the code to avoid this problem.
cinap_lenrek [Sun, 26 May 2013 23:09:34 +0000 (01:09 +0200)]
kernel: closechanq error
catch potential interrupt error from kproc(). this can happen when
we run out of processes, then newproc() will call rsrcwait()
which does tsleep(). if the process gets a note, this might
raise a interrupt error.
the variables elem and file0 and commited are explicitely
set to avoid that they get freed in ther waserror() handlers.
but it turns out the compiler optimizes this out as he
thinks the variables arent used any further. (the compiler
is not aware of the waserror() / longjmp() semantics).
rearrange the code to account for this. instead of using
a local variable to check for point of no return (commited),
we use up->seg[SSEG] to figure it out.
for file0 and elem, we just rearrange the code. elem can be
checked in the error handler if it was already assigned to
up->text, and file0 is just free()'d after the poperror().
remove silly busy loop in sysrendez. it is not needed.
dequeueproc() will make sure that the process has come to
rest.
cinap_lenrek [Sun, 26 May 2013 20:41:40 +0000 (22:41 +0200)]
keep fpregs always in sse (FXSAVE) format, adapt libmach and acid files for new format
we now always use the new FXSAVE format in FPsave structure and fpregs
file, converting back and forth in fpx87save() and fpx87restore().
document that fprestore() is a destructive operation now.
change fp register definition in libmach and adapt fpr() acid funciton.
avoid unneccesary copy of fpstate and fpsave in sysfork(). functions
including syscalls do not preserve the fp registers and copying fpstate
from the current process would mean we had to fpsave(&up->fpsave); first.
simply not doing it, new process starts in FPinit state.
If you run this:
{for (i in `{seq 1 70000}) echo '½•α·'} | mc | wc
mc will eventually suicide. The error comes from
/sys/src/libdraw/font.c:/^agefont which assumes it has a
display. Normally, this is set up by geninitdraw (usually
via initdraw), but mc.c avoids that to avoid the screen
redraws (flicker, at a minimum, but worse in long-running
cases).
graphics(2) does not prohibit this use, so I made the least
intrusive change to make it work.
cinap_lenrek [Sat, 25 May 2013 20:44:19 +0000 (22:44 +0200)]
kernel: fix floating point exceptions (was broken by sse kernel changes)
the fpenv() instruction stores in x87 format, using mathstate()
would interpret fpsave as FPssestate in case it was enabled!
instead, pass the status word and fppc explicitely to mathnote()
in matherror().
get rid of m->fpsavealign buffer, as we can just use FPssesave struct
which has enougth padding so rounding up base pointer will not overflow.
cinap_lenrek [Mon, 20 May 2013 21:55:38 +0000 (23:55 +0200)]
use resrcwait() when waiting for memory to become available
use resrcwait() when waiting for memory to become available. randomize
the sleep time and properly restore old process status in case tsleep()
gets interrupted.
cinap_lenrek [Sun, 19 May 2013 18:59:55 +0000 (20:59 +0200)]
devsd: don't raise Enomem error if sdmalloc() fails, instead wait for the memory to become available
filesystems do not handle i/o errors well (cwfs will abandon the blocks),
and temporary exhaustion of kernel memory (because of too many i/o's in
parallel) causes read and write on the partition to fail.
i think it is better to wait for the memory to become available in
this case. the single allocation is at max SDmaxio bytes, which makes
it likely to become available. if we havnt even enought fo that, then
rebooting the machine would be the best option. (aux/reboot)