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2020-11-08In case of failure, call sigexit() from trapsignal instead of sensig().Martin Pieuchot
Simplify MD code and reduce the amount of recursion into the signal code which helps when dealing with locks. ok cheloha@, deraadt@
2020-10-30As done on other architectures, narrow the KERNEL_LOCK only aroundTheo de Raadt
uvm_fault (and some similar "fault emulation" code which scream danger danger) tested by aoyama
2020-10-21uvm_grow() now does the vm_maxsaddr check (before locking), so callers don'tTheo de Raadt
need to do it ok kettenis
2020-10-08use access_type as the PROT_* variable for uvm_fault() consistantlyTheo de Raadt
ok kettenis
2020-10-07Include <sys/systm.h> directly instead of relying on hidden UVM includes.Martin Pieuchot
The header is being pulled via uvm_extern.h -> uvm_map.h
2020-09-27miod's proposal for traps was also wrong, causing one type of kernelTheo de Raadt
trap to reach the userland check. as suggested, this might fix it.
2020-09-25miod notes T_USER needs to be a bit, it was not.Theo de Raadt
The "snowflake" uniqueness of every MD trap impl often gets in the way of precisely & correctly interfacing to MI layers. The differences also complicates review, and causes new MI requirements to be incorrectly written. Thus an architecture will fall behind, not just because they are slow or rare, but because the code behaviour becomes increasingly incorrect. It is sad.
2020-09-25add uvm_map_isentry check for 88100, and alter the KERNEL_LOCKTheo de Raadt
management. Comments from miod.
2020-09-24Only perform uvm_map_inentry() checks for PROC_SP for userland pagefaults.Theo de Raadt
This should be sufficient for identifying pivoted ROP. Doing so for other traps is at best opportunistic for finding a straight-running ROP chain, but the added (and rare) sleeping point has proven to be dangerous. Discussed at length with kettenis and mortimer. ok mortimer kettenis mpi
2020-09-23|= is not supposed to be spelled +=Theo de Raadt
2020-08-19Push KERNEL_LOCK/UNLOCK() dance inside trapsignal().Martin Pieuchot
ok kettenis@, visa@
2020-07-08do not need these versions of timetc.hTheo de Raadt
2020-07-06Add support for timeconting in userland.Paul Irofti
This diff exposes parts of clock_gettime(2) and gettimeofday(2) to userland via libc eliberating processes from the need for a context switch everytime they want to count the passage of time. If a timecounter clock can be exposed to userland than it needs to set its tc_user member to a non-zero value. Tested with one or multiple counters per architecture. The timing data is shared through a pointer found in the new ELF auxiliary vector AUX_openbsd_timekeep containing timehands information that is frequently updated by the kernel. Timing differences between the last kernel update and the current time are adjusted in userland by the tc_get_timecount() function inside the MD usertc.c file. This permits a much more responsive environment, quite visible in browsers, office programs and gaming (apparently one is are able to fly in Minecraft now). Tested by robert@, sthen@, naddy@, kmos@, phessler@, and many others! OK from at least kettenis@, cheloha@, naddy@, sthen@
2020-06-30Remove obsolete <machine/stdarg.h> header. Nowadays the varargVisa Hankala
functionality is provided by <sys/stdarg.h> using compiler builtins. Tested in a ports bulk build on amd64 by naddy@ OK naddy@ mpi@
2020-06-23Fix format strings (%p --> %lx) in debug code.Kenji Aoyama
ok dlg@
2020-05-31introduce "cpu_rnd_messybits" for use instead of nanotime in dev/rnd.c.David Gwynne
rnd.c uses nanotime to get access to some bits that change quickly between events that it can mix into the entropy pool. it doesn't use nanotime to get a monotonically increasing set or ordered and accurate timestamps, it just wants something with bits that change. there's been discussions for years about letting rnd use a clock that's super fast to read, but not necessarily accurate, but it wasn't until recently that i figured out it wasn't interested in time at all, so things like keeping a fast clock coherent between cpu cores or correct according to ntp is unecessary. this means we can just let rnd read the cycle counters on cpus and things will be fine. cpus with cycle counters that vary in their speed and arent kept consistent between cores may even be desirable in this context. so this is the first step in converting rnd.c to reading cycle counter. it copies the nanotime backend to each arch, and they can replace it with something MD as a second step later on. djm@ suggested rnd_messybytes, but we landed on cpu_rnd_messybits. thanks to visa for his eyes. ok deraadt@ visa@ deraadt@ says he will help handle any MD fallout that occurs.
2020-05-27Retire <machine/varargs.h>.Visa Hankala
Nothing uses the header anymore. OK deraadt@ mpi@
2020-05-26Rewrite m88k mutex code as a slight variation of the MI mutex code.Kenji Aoyama
This will make mutex spinning time visible in top(1), and also might improve stability. The major change in this is that the old assembly code acquires mutexes with an atomic exchange operation, but releases them with a regular store, but the new code always uses atomic exchange operations. The mutex.h changes to the macros conform to <sys/mutex.h> to be able to reset the system while in ddb. Suggested from Miod Vallat, tested by me. The stability in heavy load is greatly improved in my case.
2019-12-11%r26 hasn't been used by the threads implementation since 2016, so stopPhilip Guenther
resetting it in child_return() and update the comment in tcb.h to reflect reality ok miod@ aoyama@
2019-11-10TRUE/FALSE conversions missed in previous.Martin Pieuchot
2019-11-08Substitute boolean_t/TRUE/FALSE/db_addr_t by int/1/0/vaddr_t.Martin Pieuchot
Tested by miod@, ok aoyama@
2019-10-15Reduce the number of places where `p_priority' and `p_stat' are set.Martin Pieuchot
This refactoring will help future scheduler locking, in particular to shrink the SCHED_LOCK(). No intended behavior change. ok visa@
2019-09-06If uvm_map_inentry returns false then a signal has been delivered, andTheo de Raadt
userret() must be called on trap() exit to deliver it, rather than repeating the same cause infinitely. discovered by George Koehler ok kettenis bluhm visa
2019-08-28sys/arch/luna88k/luna88k/locore0.S:dummy_cpu assumes thatKenji Aoyama
ci_mp_atomic_{begin,end} are 6th and 7th elements of cpu_info structure. Actually that is dummy structure used in early boot stage, but for consistency, move ci_srp_hazards position in cpu_info. ok mpi@
2019-07-20Increment `db_active' before entering db_trap() like other archs do.Martin Pieuchot
ok visa@
2019-07-09I wrote the pc-page-writeable and sp-not-MAP_STACK code to be shared, andTheo de Raadt
then ran into the messaging being poor. Then I fixed the messages. But there are two sub-cases of sp-not-MAP_STACK -- one at syscall time, and another at regular userland trap (on some architectures), and I bungled that messaging. Correct that now, while I look for yet another better way... discovered by millert, who ran an pre-MAP_STACK binary.
2019-06-17add code to check stack pointer is within MAP_STACKTheo de Raadt
from miod
2019-04-23Remove file name and line number output from witness(4)Visa Hankala
Reduce code clutter by removing the file name and line number output from witness(4). Typically it is easy enough to locate offending locks using the stack traces that are shown in lock order conflict reports. Tricky cases can be tracked using sysctl kern.witness.locktrace=1 . This patch additionally removes the witness(4) wrapper for mutexes. Now each mutex implementation has to invoke the WITNESS_*() macros in order to utilize the checker. Discussed with and OK dlg@, OK mpi@
2018-12-05Include srp.h where struct cpu_info uses srp to avoid erroring out whenJonathan Gray
including cpu.h machine/intr.h etc without first including param.h when MULTIPROCESSOR is defined. ok visa@
2018-10-22More "explicitely" -> "explicitly" in various comments.Kenneth R Westerback
ok guenther@ tb@ deraadt@
2018-09-14Unify and bump some of the NMBCLUSTERS defines. Some archs had it set toClaudio Jeker
4MB which is far too low especially when the platform is able to run MP. New limits are, amd64 = 256M; arm64, mips64, sparc64 = 64M; alpha, arm, hppa, i386, powerpc = 32M; m88k, sh = 8M Still rather conservative numbers but much better than before. At least some hangs of arm64 build boxes was caused by this. OK kettenis@, visa@
2018-08-22Adding membar_xxx defines to userland.Kenji Aoyama
The src/lib/libc/thread/rthread.c 1.8 change adds #include <sys/atomic.h> in userland code. Current m88k atomic.h contents are inside of #if defined(_KERNEL) guard, then, nothing is defined for userland program. So we need adding some defines to compile it on m88k. The original diff is suggested from Miod Vallat, modified by the advice from mpi@ and kettenis@. ok kettenis@
2018-08-20Remove unused spllock().Visa Hankala
OK deraadt@ mpi@
2018-07-10Move from sendsig() to its callers the initsiginfo() calls andPhilip Guenther
instead of passing sendsig() the code+type+val, pass a siginfo_t* to copy from. Eliminate the indirection through struct emul for sendsig(); we no longer have a SunOS4-compat version of sendsig() ok deraadt@
2018-04-12Implement MAP_STACK option for mmap(). Synchronous faults (pagefault andTheo de Raadt
syscall) confirm the stack register points at MAP_STACK memory, otherwise SIGSEGV is delivered. sigaltstack() and pthread_attr_setstack() are modified to create a MAP_STACK sub-region which satisfies alignment requirements. Observe that MAP_STACK can only be set/cleared by mmap(), which zeroes the contents of the region -- there is no mprotect() equivalent operation, so there is no MAP_STACK-adding gadget. This opportunistic software-emulation of a stack protection bit makes stack-pivot operations during ROPchain fragile (kind of like removing a tool from the toolbox). original discussion with tedu, uvm work by stefan, testing by mortimer ok kettenis
2018-03-12Make luna88k use the MI mplock implementation.Kenji Aoyama
(forget to remove from repository) ok visa@
2018-03-12Make luna88k use the MI mplock implementation.Kenji Aoyama
ok visa@
2018-03-05#define _MAX_PAGE_SHIFT in MD _types.h as the maximum pagesize an archTheo de Raadt
needs (looking at you sgi, but others required this before). This is for the circumstances we need pagesize known at compile time, not getpagesize() runtime. Use it for malloc storage sizes, for shm, and to set pthread stack default sizes. The stack sizes were a mess, and pushing them towards page-aligned is healthy move (which will also be needed by the coming stack register checker) ok guenther kettenis, discussion with stefan
2018-01-13Define and use IPL_MPFLOOR in our common mutex implementation.Martin Pieuchot
ok kettenis@, visa@
2018-01-04Unify <machine/mutex.h> a bit further.Martin Pieuchot
Remove `mtx_lock' from i386, add volatile before `mtx_owner' where it was missing. Inputs from kettenis@, ok visa@
2017-12-14fcntl(F_SETFL) invokes the FIONBIO and FIOASYNC ioctls internally, soPhilip Guenther
the memory devices (/dev/null, /dev/zero, etc) need to permit them. problem noted, tweak, and testing by jeremy@ ok deraadt@
2017-12-04Change __mp_lock_held() to work with an arbitrary CPU info structure andMartin Pieuchot
extend ddb(4) "ps /o" output to print which CPU is currently holding the KERNEL_LOCK(). Tested by dhill@, ok visa@
2017-09-08If you use sys/param.h, you don't need sys/types.hTheo de Raadt
2017-09-05Move mutex, condvar, and thread-specific data routes, pthread_once, andPhilip Guenther
pthread_exit from libpthread to libc, along with low-level bits to support them. Major bump to both libc and libpthread. Requested by libressl team. Ports testing by naddy@ ok kettenis@
2017-06-22Tidy up comment about double load opcodes in m88k/eh_common.S (and fix ;; -> ||)Tom Cosgrove
ok miod@
2017-05-30Kill db_sym_t.Martin Pieuchot
ok deraadt@, kettenis@, jasper@
2017-05-29Kill SPINLOCK_SPIN_HOOK, use CPU_BUSY_CYCLE() instead.Martin Pieuchot
ok visa@, kettenis@
2017-05-29copyin32 implementation from miod@Martin Pieuchot
ok kettenis@
2017-04-30Rename Debugger() into db_enter().Martin Pieuchot
Using a name with the 'db_' prefix makes it invisible from the dynamic profiler. ok deraadt@, kettenis@, visa@
2017-04-20Hook up mutex(9) to witness(4).Visa Hankala
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