Commit graph

534 commits

Author SHA1 Message Date
David van Moolenbroek
49808dcf77 PM delay call infrastructure improvements
- allow PM to tell sys_runctl() whether to use delay call feature
- only use this feature in PM for delivering signals - not for exits
- do better error checking in PM on sys_runctl() calls
- rename SIGKREADY to SIGNDELAY
2009-10-01 10:36:09 +00:00
David van Moolenbroek
b423d7b477 Merge of David's ptrace branch. Summary:
o Support for ptrace T_ATTACH/T_DETACH and T_SYSCALL
o PM signal handling logic should now work properly, even with debuggers
  being present
o Asynchronous PM/VFS protocol, full IPC support for senda(), and
  AMF_NOREPLY senda() flag

DETAILS

Process stop and delay call handling of PM:
o Added sys_runctl() kernel call with sys_stop() and sys_resume()
  aliases, for PM to stop and resume a process
o Added exception for sending/syscall-traced processes to sys_runctl(),
  and matching SIGKREADY pseudo-signal to PM
o Fixed PM signal logic to deal with requests from a process after
  stopping it (so-called "delay calls"), using the SIGKREADY facility
o Fixed various PM panics due to race conditions with delay calls versus
  VFS calls
o Removed special PRIO_STOP priority value
o Added SYS_LOCK RTS kernel flag, to stop an individual process from
  running while modifying its process structure

Signal and debugger handling in PM:
o Fixed debugger signals being dropped if a second signal arrives when
  the debugger has not retrieved the first one
o Fixed debugger signals being sent to the debugger more than once
o Fixed debugger signals unpausing process in VFS; removed PM_UNPAUSE_TR
  protocol message
o Detached debugger signals from general signal logic and from being
  blocked on VFS calls, meaning that even VFS can now be traced
o Fixed debugger being unable to receive more than one pending signal in
  one process stop
o Fixed signal delivery being delayed needlessly when multiple signals
  are pending
o Fixed wait test for tracer, which was returning for children that were
  not waited for
o Removed second parallel pending call from PM to VFS for any process
o Fixed process becoming runnable between exec() and debugger trap
o Added support for notifying the debugger before the parent when a
  debugged child exits
o Fixed debugger death causing child to remain stopped forever
o Fixed consistently incorrect use of _NSIG

Extensions to ptrace():
o Added T_ATTACH and T_DETACH ptrace request, to attach and detach a
  debugger to and from a process
o Added T_SYSCALL ptrace request, to trace system calls
o Added T_SETOPT ptrace request, to set trace options
o Added TO_TRACEFORK trace option, to attach automatically to children
  of a traced process
o Added TO_ALTEXEC trace option, to send SIGSTOP instead of SIGTRAP upon
  a successful exec() of the tracee
o Extended T_GETUSER ptrace support to allow retrieving a process's priv
  structure
o Removed T_STOP ptrace request again, as it does not help implementing
  debuggers properly
o Added MINIX3-specific ptrace test (test42)
o Added proper manual page for ptrace(2)

Asynchronous PM/VFS interface:
o Fixed asynchronous messages not being checked when receive() is called
  with an endpoint other than ANY
o Added AMF_NOREPLY senda() flag, preventing such messages from
  satisfying the receive part of a sendrec()
o Added asynsend3() that takes optional flags; asynsend() is now a
  #define passing in 0 as third parameter
o Made PM/VFS protocol asynchronous; reintroduced tell_fs()
o Made PM_BASE request/reply number range unique
o Hacked in a horrible temporary workaround into RS to deal with newly
  revealed RS-PM-VFS race condition triangle until VFS is asynchronous

System signal handling:
o Fixed shutdown logic of device drivers; removed old SIGKSTOP signal
o Removed is-superuser check from PM's do_procstat() (aka getsigset())
o Added sigset macros to allow system processes to deal with the full
  signal set, rather than just the POSIX subset

Miscellaneous PM fixes:
o Split do_getset into do_get and do_set, merging common code and making
  structure clearer
o Fixed setpriority() being able to put to sleep processes using an
  invalid parameter, or revive zombie processes
o Made find_proc() global; removed obsolete proc_from_pid()
o Cleanup here and there

Also included:
o Fixed false-positive boot order kernel warning
o Removed last traces of old NOTIFY_FROM code

THINGS OF POSSIBLE INTEREST

o It should now be possible to run PM at any priority, even lower than
  user processes
o No assumptions are made about communication speed between PM and VFS,
  although communication must be FIFO
o A debugger will now receive incoming debuggee signals at kill time
  only; the process may not yet be fully stopped
o A first step has been made towards making the SYSTEM task preemptible
2009-09-30 09:57:22 +00:00
Ben Gras
8d9aa1fe4f throw out exec debugging message. 2009-09-30 08:36:13 +00:00
Tomas Hruby
4dad30937b Removed macros that depend on NOTIFY_FROM from servers and drivers. They
determine the information defined by these macros from the m_source field of the
notify message.
2009-09-29 18:47:56 +00:00
Ben Gras
0e43db1375 disable address space randomisation feature in normal mode. 2009-09-29 12:10:30 +00:00
Ben Gras
856ec906bd assert overammbitious. 2009-09-28 01:23:11 +00:00
Ben Gras
7a45f80bd5 threw out sanity checks before pagetable rewrites, triggering false
page table inconsistencies.

fix handle_memory logic. again.
2009-09-27 12:44:36 +00:00
Ben Gras
67602ce85e field for sanity check feature. 2009-09-27 12:37:37 +00:00
Ben Gras
5715637aa2 new prototypes. 2009-09-27 12:37:16 +00:00
Ben Gras
5cf59f9225 verbose printing and sanity checking functions. 2009-09-27 12:36:48 +00:00
Ben Gras
a02d9aae0a re-enable munmap(). 2009-09-25 19:01:27 +00:00
Ben Gras
e114ae8195 unnecessarily verbose message. 2009-09-25 17:59:38 +00:00
Ben Gras
aa1c90fdd7 correct logic error in region.c. 2009-09-25 17:39:39 +00:00
Tomas Hruby
97fe6a4ba5 Broken pipes fix
- fix for the broken partial pipes r/w operations
2009-09-24 16:03:25 +00:00
Ben Gras
f236d1dd9c throw out the debugging stuff again. 2009-09-23 16:26:05 +00:00
Ben Gras
af77f4e964 debug output in SANITYCHECKS mode 2009-09-23 16:02:27 +00:00
Ben Gras
f87a91ce95 missing level-- in out-of-memory case. 2009-09-23 15:19:36 +00:00
Ben Gras
74616a057b temporarily disable munmap() to mask memory problem. 2009-09-23 13:34:04 +00:00
Ben Gras
4c11d7e6f5 - simplify findhole() for use for 1 page only
- do WMF_FREE
 - added WMF_VERIFY to check page table contents
 - randomize address space usage in vm self
2009-09-23 13:33:01 +00:00
Tomas Hruby
f53377ed67 Removed the broken PROC_EVENT and SYN_ALARM from VFS 2009-09-22 22:11:20 +00:00
Tomas Hruby
8590ac260d Removed dependency of vfs on NR_TASKS macro
- all macros in consts.h that depend on NR_TASKS replaced by a FP_BLOCKED_ON_*

- fp_suspended removed and replaced by fp_blocked_on. Testing whether a process
  is supended is qeual to testing whether fp_blocked_on is FP_BLOCKED_ON_NONE or
  not

- fp_task is valid only if fp_blocked_on == FP_BLOCKED_ON_OTHER

- no need of special values that do not colide with valid and special endpoints
  since they are not used as endpoints anymore

- suspend only takes FP_BLOCKED_ON_* values not endpoints anymore

- suspend(task) replaced by wait_for(task) which sets fp_task so we remember who
  are we waiting for and suspend sets fp_blocked_on to FP_BLOCKED_ON_OTHER to
  signal that we are waiting for some other process

- some functions should take endpoint_t instead of int, fixed
2009-09-22 21:48:26 +00:00
Ben Gras
0b713b0de5 unmap VR_DIRECT mappings too (fix for X) 2009-09-22 11:51:17 +00:00
Ben Gras
76a02db5e7 unused, thanks david 2009-09-21 21:00:36 +00:00
Ben Gras
32fa22fc2d RS_LOOKUP feature for libc functions that want to access servers.
let ipc talk to all USER processes and vice versa.

pm sig wrapper notify has to be called from two files.

actually install include files.
2009-09-21 15:25:15 +00:00
Ben Gras
75d3db4911 new ipc server that implements shared memory and semaphores.
this server, tests, vm support, library stubs and other contributions
are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 14:53:13 +00:00
Ben Gras
32fbbd370c - pages that points to page directory values of all processes,
shared with the kernel, mapped into kernel address space; 
   kernel is notified of its location. kernel segment size is
   increased to make it fit.
 - map in kernel and other processes that don't have their
   own page table using single 4MB (global) mapping.
 - new sanity check facility: objects that are allocated with
   the slab allocator are, when running with sanity checking on,
   marked readonly until they are explicitly unlocked using the USE()
   macro.
 - another sanity check facility: collect all uses of memory and
   see if they don't overlap with (a) eachother and (b) free memory
 - own munmap() and munmap_text() functions.
 - exec() recovers from out-of-memory conditions properly now; this
   solves some weird exec() behaviour
 - chew off memory from the same side of the chunk as where we
   start scanning, solving some memory fragmentation issues
 - use avl trees for freelist and phys_ranges in regions
 - implement most useful part of munmap()
 - remap() stuff is GQ's for shared memory
2009-09-21 14:49:49 +00:00
Ben Gras
f5459e38db - some exec debugging prints when errors happen
- lookup mounted_on check to avoid NULL dereference
 - some errors in exec() shouldn't be fatal
2009-09-21 14:49:26 +00:00
Ben Gras
e402927576 support for vm priv system.
fix NULL envp ptr.
2009-09-21 14:49:04 +00:00
Ben Gras
5f497bcf22 - Introduce some macros for field names, so that endpt, pendpt,
addr and taddr don't have to be defined any more, so that <sys/mman.h>
    can be included for proper prototypes of munmap() and friends.
  - rename our GETPID to MINIX_GETPID to avoid a name conflict with
    other sources
  - PM needs its own munmap() and munmap_text() to avoid sending messages
    to VM at the startup phase. It *does* want to do that, but only
    after initialising. So they're called again with unmap_ok set to 1
    later.
  - getnuid(), getngid() implementation
2009-09-21 14:48:19 +00:00
Ben Gras
a0d8cc0765 - No maximum block size any more.
- If allocation of a new buffer fails, use an already-allocated
   unused buffer if available (low memory conditions)
 - Allocate buffers dynamically, so memory isn't wasted on wrong-sized
   buffers.
 - No more _MAX_BLOCK_SIZE.
2009-09-21 14:47:51 +00:00
Ben Gras
08d291da53 no more scheduling queue dumps (kernel will print this over serial);
initial vm stats retrieve support
2009-09-21 14:47:24 +00:00
Ben Gras
90be3a051f clever hack to avoid starting from 0 disabled because
when own 0-pages are mapped out, this doesn't work and
isn't necessary.
2009-09-21 14:46:42 +00:00
Erik van der Kouwe
3615d93383 Handle SIGSTOP more consistently and according to POSIX rules; it can no longer be ignored 2009-09-13 12:24:23 +00:00
David van Moolenbroek
ba83b7663d PM: some tiny fixes 2009-09-12 18:36:07 +00:00
David van Moolenbroek
18ae423990 it's/its 2009-09-06 17:13:08 +00:00
David van Moolenbroek
979bcfc195 - sys_privctl: don't mix message types
- sys_privctl: remove CTL_MM_PRIV (third parameter)
- remove obsolete sys_svrctl.c library file
2009-09-06 12:37:13 +00:00
David van Moolenbroek
42f0bf7dda VFS: fetch_name() buffer underflow (reported by John Peace, bug #305) 2009-08-29 08:22:50 +00:00
Tomas Hruby
f3e0c5c381 VFS quits gracefully if mount fails and mounted_on remains uninitialized 2009-08-18 13:30:05 +00:00
Thomas Veerman
b47483433c Added a hack to start binaries from the boot image only. In particular, setting
bin_img=1 in the boot monitor will make sure that during the boot procedure the
mfs binary that is part of the boot image is the only binary that is used to
mount partitions. This is useful when for some reason the mfs binary on disk 
malfunctions, rendering Minix unable to boot. By setting bin_img=1, the binary
on disk is ignored and the binary in the boot image is used instead.

- 'service' now accepts an additional flag -r. -r implies -c. -r instructs RS
  to first look in memory if the binary has already been copied to memory and
  execute that version, instead of loading the binary from disk. For example,
  the first time a MFS is being started it is copied (-c) to memory and
  executed from there. The second time MFS is being started this way, RS will
  look in memory for a previously copied MFS binary and reuse it if it exists.
- The mount and newroot commands now accept an additional flag -i, which
  instructs them to set the MS_REUSE flag in the mount flags.
- The mount system call now supports the MS_REUSE flag and invokes 'service'
  with the -r flag when MS_REUSE is set.
- /etc/rc and the rc script that's included in the boot image check for the
  existence of the bin_img flag in the boot monitor, and invoke mount and 
  newroot with the -i flag accordingly.
2009-08-18 11:36:01 +00:00
David van Moolenbroek
769a0cdb35 PM: make SIGBUS, but not SIGUSR1 or SIGUSR2, cause a core dump 2009-08-15 23:23:24 +00:00
David van Moolenbroek
323f0abdd6 Support for setitimer(ITIMER_VIRTUAL/ITIMER_PROF). New test (41) for setitimer. 2009-08-15 21:37:26 +00:00
David van Moolenbroek
d82e260a90 Support for setitimer(ITIMER_REAL). 2009-08-15 16:09:32 +00:00
Tomas Hruby
09a47e6a40 vm_assert macros fix up 2009-08-11 07:53:32 +00:00
David van Moolenbroek
5a370afc8e MFS put_inode issues (reported by Maurizio Lombardi) 2009-07-22 08:54:28 +00:00
Thomas Veerman
ce916bcb91 Fixed a minor select bug:
- When one does a select on a file descriptor that is meaningless for that particular file type, select shall indicate that the file descriptor is ready for that particular operation and that the file descriptor has no exceptional condition pending.
2009-07-14 09:39:05 +00:00
David van Moolenbroek
b21beea985 IS: fix up PM flags field somewhat 2009-07-12 15:30:59 +00:00
David van Moolenbroek
f80aaae86a MFS: remove some redundant code (reported by Maurizio Lombardi) 2009-07-12 13:57:34 +00:00
David van Moolenbroek
013241a006 RS: the plural of 'child' is 'children' 2009-07-11 17:59:05 +00:00
David van Moolenbroek
9e075d8623 PM cleanup: remove unused fields from mproc structure 2009-07-11 17:15:33 +00:00
David van Moolenbroek
1a9e07b0e5 PM: fix ptrace(T_EXIT) 'exit_proc: not idle' race condition. 2009-07-11 13:22:56 +00:00