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315 Commits

Author SHA1 Message Date
Andreas Kling
b1bb737704 Kernel: Remove Process::m_next_address. 
This isn't needed now that we have RangeAllocator. :^)
 2019-05-17 03:47:00 +02:00
Andreas Kling
c414e65498 Kernel: Implement a simple virtual address range allocator. 
This replaces the previous virtual address allocator which was basically
just "m_next_address += size;"

With this in place, virtual addresses can get reused, which cuts down on
the number of page tables created. When we implement ASLR some day, we'll
probably have to do page table deallocation, but for now page tables are
only deallocated once the process dies.
 2019-05-17 03:40:15 +02:00
Andreas Kling
4e88872c8e Kernel: Always dump_backtrace() on process crash. 2019-05-16 19:49:48 +02:00
Andreas Kling
174639b7f0 Kernel: Symbolicate userspace backtraces using ELFLoader. 
Stash away the ELFLoader used to load an executable in Process so we can use
it for symbolicating userspace addresses later on. This will make debugging
userspace programs a lot nicer. :^)
 2019-05-16 17:18:25 +02:00
Andreas Kling
2f4e7edee5 Kernel: Simplify dump_backtrace() API for clients. 
It makes no sense that clients had to worry about whether or not KSyms
were loaded.
 2019-05-16 13:41:16 +02:00
Andreas Kling
486c675850 Kernel: Allocate kernel signal stacks using the region allocator as well. 2019-05-14 12:06:09 +02:00
Andreas Kling
c8a216b107 Kernel: Allocate kernel stacks for threads using the region allocator. 
This patch moves away from using kmalloc memory for thread kernel stacks.
This reduces pressure on kmalloc (16 KB per thread adds up fast) and
prevents kernel stack overflow from scribbling all over random unrelated
kernel memory.
 2019-05-14 11:51:00 +02:00
Andreas Kling
99aead4857 Kernel: Add a writev() syscall for writing multiple buffers in one go. 
We then use this immediately in the WindowServer/LibGUI communication in
order to send both message + optional "extra data" with a single syscall.
 2019-05-10 03:19:25 +02:00
Andreas Kling
72cbcd8e98 Kernel: Dump backtrace on exit() syscall. 
This makes assertion failures a lot more pleasant to investigate.
 2019-05-06 21:48:48 +02:00
Andreas Kling
780d2a08c4 IPv4: Save the source address/port together with incoming packet payloads. 
We need the address/port to fill in the out-params in recvfrom().
It should now be more or less possible to create a UDP server. :^)
 2019-05-04 03:27:50 +02:00
Andreas Kling
8b249bd09b Kernel+Userland: Implement mknod() syscall and add a /bin/mknod program. 2019-05-03 22:59:58 +02:00
Andreas Kling
03da7046bd Kernel: Prepare Socket for becoming a File. 
Make the Socket functions take a FileDescriptor& rather than a socket role
throughout the code. Also change threads to block on a FileDescriptor,
rather than either an fd index or a Socket.
 2019-05-03 20:15:54 +02:00
Andreas Kling
c3b7ace3e0 Kernel: Assign Lock names in class member initializers. 2019-05-02 03:28:20 +02:00
Andreas Kling
14ac77131b Kernel: The exit_thread() syscall should unlock the big lock. 
Since exit_thread() never returns, it can't rely on the syscall trap handler
to unlock the big lock before returning.
 2019-04-29 15:56:25 +02:00
Andreas Kling
d07be1087a Kernel+LibC: Add exit_thread() syscall. 2019-04-29 15:17:20 +02:00
Andreas Kling
8cbb7f101f Kernel: Have File virtuals take a FileDescriptor& rather than a Process&. 
This will allow us to implement different behaviors depending on the role
of the descriptor a File is being accessed through.
 2019-04-29 13:58:40 +02:00
Andreas Kling
0a0d739e98 Kernel: Make FIFO inherit from File. 2019-04-29 04:55:54 +02:00
Andreas Kling
e886337a67 Kernel: Make ProcessTracer inherit from File. 2019-04-28 15:02:55 +02:00
Andreas Kling
679ac386eb Kernel: "Succeed" quietly for zero-length read() and write(). 2019-04-27 16:17:24 +02:00
Andreas Kling
490e89e240 LibC: Add execvpe() and make execvp()'ed children inherit environment. 2019-04-26 03:16:26 +02:00
Andreas Kling
d5578826af Kernel: Make it possible to look up FIFO's by ID. 
This will be useful when implementing the /proc/PID/fd/N links where N is
a file descriptor referring to a FIFO.
 2019-04-25 13:53:24 +02:00
Andreas Kling
c5c4e54a67 Kernel: Process destruction should destroy all child threads. 
We were only destroying the main thread when a process died, leaving any
secondary threads around. They couldn't run, but because they were still
in the global thread list, strange things could happen since they had some
now-stale pointers to their old process.
 2019-04-23 22:17:01 +02:00
Andreas Kling
5c68929aa1 Kernel: Add a systrace() syscall and implement /bin/strace using it. 
Calling systrace(pid) gives you a file descriptor with a stream of the
syscalls made by a peer process. The process must be owned by the same
UID who calls systrace(). :^)
 2019-04-22 18:44:45 +02:00
Andreas Kling
a9d09e9020 Kernel: Get rid of the "cool globals" thingy. 
This was something I used while debugging with Computron. I haven't needed
it for months, so let's get rid of it. It's trivial to readd if needed.
 2019-04-21 12:33:14 +02:00
Andreas Kling
5f63f8120c Kernel: Remove "restorer" field from SignalActionData. 
I was originally implementing signals by looking at some man page about
sigaction() to see how it works. It seems like the restorer thingy is
system-specific and not required by POSIX, so let's get rid of it.
 2019-04-20 19:32:14 +02:00
Andreas Kling
b2ebf6c798 Kernel: Shrink Thread by making kernel resume TSS heap-allocated. 2019-04-20 19:23:45 +02:00
Andreas Kling
ec365b82d5 Kernel: Make the colonel run at "Idle" priority (the lowest possible.) 
This means it won't hog the CPU for more than a single timeslice. :^)
 2019-04-20 15:58:45 +02:00
Andreas Kling
5eedb22834 Sprinkle use of AK::Vector in various places. 
Some of these are less helpful than others. Avoiding a bunch of mallocs
in the event loop wakeup code is definitely nice.
 2019-04-20 14:02:19 +02:00
Andreas Kling
1debc0a78c Kernel: Reduce kmallocing in all_processes() and all_pids(). 2019-04-16 00:37:35 +02:00
Andreas Kling
ae0dc22716 Kernel: Make validate_read_from_kernel() return early for nullptr checks. 
Null pointers are always invalid, so don't bother going through all the
various checks for them.
 2019-04-15 23:48:31 +02:00
Andreas Kling
13041f894f Kernel: Start using StringView in the VFS class. 
The less kmalloc() we can do, the better. Calling kmalloc() disables all
interrupts while it runs, so it's directly affecting responsiveness.
 2019-04-15 14:57:27 +02:00
Andreas Kling
3f6408919f AK: Improve smart pointer ergonomics a bit. 2019-04-14 02:36:06 +02:00
Andreas Kling
29d0412a06 Kernel: Remove system.h and make the uptime global a qword. 2019-04-14 01:29:14 +02:00
Andreas Kling
60a819c14a Kernel: Yet more work on bringing up POSIX SHM. 2019-04-09 02:37:38 +02:00
Andreas Kling
26a06f3fcd Kernel: More work towards POSIX SHM, also add ftruncate(). 2019-04-09 01:10:00 +02:00
Andreas Kling
99f3cc26c3 Kernel+LibC: Add stubs for POSIX shared memory API. 
Specifically shm_open() and shm_unlink(). This patch just adds stubs.
 2019-04-08 23:44:12 +02:00
Andreas Kling
65d6318c33 Kernel: Support non-blocking connect(). 
If connect() is called on a non-blocking socket, it will "fail" immediately
with -EINPROGRESS. After that, you select() on the socket and wait for it to
become writable.
 2019-04-08 04:52:21 +02:00
Andreas Kling
37ae00a4dd Kernel+Userland: Add the rename() syscall along with a basic /bin/mv. 2019-04-07 23:35:26 +02:00
Andreas Kling
644c887594 Kernel: Move FIFO into FileSystem/ and Socket+LocalSocket into Net/. 2019-04-06 20:29:48 +02:00
Andreas Kling
ac6c7d3e19 Kernel: Use alloc_fd() more instead of walking fd list manually. 2019-04-06 14:54:32 +02:00
Andreas Kling
a58d7fd8bb Kernel: Get rid of Kernel/types.h, separate LinearAddress/PhysicalAddress. 2019-04-06 14:29:29 +02:00
Andreas Kling
b9738fa8ac Kernel: Move VM-related files into Kernel/VM/. 
Also break MemoryManager.{cpp,h} into one file per class.
 2019-04-03 15:13:07 +02:00
Andreas Kling
a095a90b51 Kernel: Remove ancient nprocess and nblocked globals. 
These were not in sync with reality, and not used anywhere anyway.
 2019-04-03 13:05:20 +02:00
Andreas Kling
ab43658c55 Kernel: Move devices into Kernel/Devices/. 2019-04-03 12:36:40 +02:00
Andreas Kling
072ea7eece Kernel: Move ELF-related files into Kernel/ELF/. 2019-04-03 12:30:04 +02:00
Andreas Kling
9fca94269e Kernel: Move TTY-related files into Kernel/TTY/. 2019-04-03 12:28:45 +02:00
Andreas Kling
f9864940eb Kernel: Move FS-related files into Kernel/FileSystem/ 2019-04-03 12:25:24 +02:00
Andreas Kling
d11b5407a3 Kernel: Get rid of the GPL elf.h and import exec_elf.h from OpenBSD. 2019-04-03 11:30:56 +02:00
Andreas Kling
649c81a714 Kernel: Move networking related files into Kernel/Net/. 2019-04-02 19:54:38 +02:00
Andreas Kling
d5a9f4596b Kernel: Add a blunt big process lock. 
We can't have multiple threads in the same process running in the kernel
at the same time, so let's have a per-process lock that threads have to
acquire on syscall entry/exit (and yield while blocked.)
 2019-04-01 20:04:29 +02:00