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This allows region allocation to return specific errors and we don't
have to assume every failure is an ENOMEM.
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Thanks to Idan for spotting this!
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This patch adds a new AnonymousFile class which is a File backed by
an AnonymousVMObject that can only be mmap'ed and nothing else, really.
I'm hoping that this can become a replacement for shbufs. :^)
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This allows temporarily unlocking a lock or re-locking it, and it will
only unlock if it is still being held.
Fixes #4352
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Problem:
- Many constructors are defined as `{}` rather than using the ` =
default` compiler-provided constructor.
- Some types provide an implicit conversion operator from `nullptr_t`
instead of requiring the caller to default construct. This violates
the C++ Core Guidelines suggestion to declare single-argument
constructors explicit
(https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c46-by-default-declare-single-argument-constructors-explicit).
Solution:
- Change default constructors to use the compiler-provided default
constructor.
- Remove implicit conversion operators from `nullptr_t` and change
usage to enforce type consistency without conversion.
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Everyone was already using /proc/df which has all the info anyway.
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There was nothing interesting in this file.
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Fixes #4909
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The vast majority of programs don't ever need to use sys$ptrace(),
and it seems like a high-value system call to prevent a compromised
process from using.
This patch moves sys$ptrace() from the "proc" promise to its own,
new "ptrace" promise and updates the affected apps.
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This was too spammy to ever actually be used anyway.
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.
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Problem:
- The implementation of `find` is coupled to the implementation of
`SinglyLinkedList`.
Solution:
- Decouple the implementation of `find` from the class by using a
generic `find` algorithm.
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Problem:
- The implementation of `find` is coupled to the implementation of
`DoublyLinkedList`.
- `append` and `prepend` are implemented multiple times so that
r-value references can be moved from into the new node. This is
probably not called very often because a pr-value or x-value needs
to be used here.
Solution:
- Decouple the implementation of `find` from the class by using a
generic `find` algorithm.
- Make `append` and `prepend` be function templates so that they can
have binding references which can be forwarded.
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Fixes #4904
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.Everything:
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.Everything:
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.Everything:
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.Everything:
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.Everything:
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This patch merges the profiling functionality in the kernel with the
performance events mechanism. A profiler sample is now just another
perf event, rather than a dedicated thing.
Since perf events were already per-process, this now makes profiling
per-process as well.
Processes with perf events would already write out a perfcore.PID file
to the current directory on death, but since we may want to profile
a process and then let it continue running, recorded perf events can
now be accessed at any time via /proc/PID/perf_events.
This patch also adds information about process memory regions to the
perfcore JSON format. This removes the need to supply a core dump to
the Profiler app for symbolication, and so the "profiler coredump"
mechanism is removed entirely.
There's still a hard limit of 4MB worth of perf events per process,
so this is by no means a perfect final design, but it's a nice step
forward for both simplicity and stability.
Fixes #4848
Fixes #4849
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When loading non position-independent programs, we now take care not to
load the dynamic loader at an address that collides with the location
the main program wants to load at.
Fixes #4847.
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This will enable us to take the desired load address of non-position
independent programs into account when randomizing the load address
of the dynamic loader.
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Trying to pass these onto the Terminal while handling an IRQ is a recipe
for disaster. Use Processor::deferred_call_queue to create an ad-hoc
"second half" of the interrupt handler.
Fixes #4889
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This makes the "reverse video" SGR actually work.
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SystemServer now creates the /tmp/coredump and /tmp/profiler_coredumps
directories at startup, ensuring that they are owned by root, and with
basic 0755 permissions.
The kernel will also now refuse to put core dumps in a directory that
doesn't fulfill the following criteria:
- Owned by 0:0
- Directory with sticky bit not set
- 0755 permissions
Fixes #4435
Fixes #4850
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We were not handling sticky parents properly in sys$rmdir(). Child
directories of a sticky parent should not be rmdir'able by just anyone.
Only the owner and root.
Fixes #4875.
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Before this change, truncating an Ext2FS inode to a larger size than it
was before would give you uninitialized on-disk data.
Fix this by zeroing out all the new space when doing an inode resize.
This is pretty naively implemented via Inode::write_bytes() and there's
lots of room for cleverness here in the future.
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Also remove some dbg()'s that were printing incorrect information.
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.Everything:
The modifications in this commit were automatically made using the
following command:
find . -name '*.cpp' -exec sed -i -E 's/dbg\(\) << ("[^"{]*");/dbgln\(\1\);/' {} \;
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.
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These changes are arbitrarily divided into multiple commits to make it
easier to find potentially introduced bugs with git bisect.
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If we can fail with EFAULT early, might as well avoid switching the
paging scope.
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We can now test a _very_ basic transaction via `do_debug_transfer()`.
This function merely attaches some TDs to the LSCTRL queue head
and points some input and output buffers. We then sense an interrupt
with USBSTS value of 1, meaning Interrupt On Completion
(of the transaction). At this point, the input buffer is filled with
some data.
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It seems like Haiku and Grub do this, so let's not bother
with any fancy timing stuff for now (to at least get
_something_ working...)
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According the USB spec/UHCI datasheet (as well as the Linux and
BSD source code), if we receive an IRQ and USBSTS is 0, then
the IRQ does not belong to us and we should immediately jump
out of the handler.
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We can now read/write to the two root ports exposed to the
UHCI controller, and detect when a device is plugged in or
out via a kernel process that constantly scans the port
for any changes. This is very basic, but is a bit of fun to see
the kernel detecting hardware on the fly :^)
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Implemented both Queue Heads and Transfer Descriptors. These
are required to actually perform USB transactions. The UHCI
driver sets up a pool of these that can be allocated when we
need them. It seems some drivers have these statically
allocated, so it might be worth looking into that, but
for now, the simple way seems to be to allocate them on
the fly as we need them, and then release them.
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It seems that not setting the framelist address register
was causing the entire system to lock up as it generated an insane
interrupt storm in the IRQ handler for the UHCI controller.
We now allocate a 4KiB aligned page via
`MemoryManager::allocate_supervisor_physical_page()` and set every
value to 1. In effect, this creates a framelist with each entry
being a "TERMINATE" entry in which the controller stalls until its'
1mS time slice is up.
Some more registers have also been set for consistency, though it
seems like this don't need to be set explicitly in software.
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The entire USB spec involves more than just UHCI, so
let's put everything into it's own nice namespace :^)
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As the USB/UHCI driver grows in size, it'll be much cleaner to have
all of the USB related files in one folder where they can be easily
accessed :^)
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