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The kernel is now no longer identity mapped to the bottom 8MiB of
memory, and is now mapped at the higher address of `0xc0000000`.
The lower ~1MiB of memory (from GRUB's mmap), however is still
identity mapped to provide an easy way for the kernel to get
physical pages for things such as DMA etc. These could later be
mapped to the higher address too, as I'm not too sure how to
go about doing this elegantly without a lot of address subtractions.
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This adds a call to set_metadata_dirty(true) to
Ext2FS::write_directory(). This fixes a bug wherein InodeWatchers
weren't alerted on directory updates.
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We'll never use exceptions in the kernel, so there's no need for unwind
tables and we can save ourselves some space.
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Remove explicit checking for pending signals from writing code paths,
since this is handled automatically when blocking, and should not
happen if the write() call is "short", i.e. doesn't block. All the
other syscalls already work like this.
Fixes https://github.com/SerenityOS/serenity/issues/797
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After a socket has disconnected, we shouldn't return -EAGAIN. Instead
we should allow userspace to read/recvfrom the socket until its packet
queue has been exhausted.
At that point, we now return 0, signalling EOF.
It might be even better to start returning -ENOTCONN after signalling
EOF once. I'm not sure how that should work, needs looking into.
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This worked locally because I already had the built generators lying
around, but failed for other people who hadn't built them yet. Oops!
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Instead of trying to build the host-side code generator helpers right
before we need them in the LibHTML build process, just build them ahead
of time in makeall.sh, like we already do for {IPC,Form}Compiler.
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This is a bit gentler than jumping to 0x0, which always crashes the
whole process. Also log a debug message about what happened, and let
the user know that it's probably time to rebuild the program.
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Add an initial implementation of pthread attributes for:
* detach state (joinable, detached)
* schedule params (just priority)
* guard page size (as skeleton) (requires kernel support maybe?)
* stack size and user-provided stack location (4 or 8 MB only, must be aligned)
Add some tests too, to the thread test program.
Also, LibC: Move pthread declarations to sys/types.h, where they belong.
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This can be implemented entirely in userspace by calling tcgetattr().
To avoid screwing up the syscall indexes, this patch also adds a
mechanism for removing a syscall without shifting the index of other
syscalls.
Note that ports will still have to be rebuilt after this change,
as their LibC code will try to make the isatty() syscall on startup.
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We wouldn't be able to run on an 80386 without considerable changes,
so let's be honest here and call it i686.
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Since this function doesn't actually mark the inode as allocated,
let's tone down the name a little bit.
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We would misinterpret short writes to the first 60 bytes of a slow
symlink as writes to a fast symlink.
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Have pthread_create() allocate a stack and passing it to the kernel
instead of this work happening in the kernel. The more of this we can
do in userspace, the better.
This patch also unexposes the raw create_thread() and exit_thread()
syscalls since they are now only used by LibPthread anyway.
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Expose these two region bits through /proc/PID/vm and show them in the
SystemMonitor process memory map view.
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VM regions can now be marked as stack regions, which is then validated
on syscall, and on page fault.
If a thread is caught with its stack pointer pointing into anything
that's *not* a Region with its stack bit set, we'll crash the whole
process with SIGSTKFLT.
Userspace must now allocate custom stacks by using mmap() with the new
MAP_STACK flag. This mechanism was first introduced in OpenBSD, and now
we have it too, yay! :^)
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Otherwise, a thread calling sched_yield() will prevent other threads
in that process from entering the kernel.
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Now that the kernel supports startup-time constructors, we were first
doing slab_alloc_init(), and then the constructors ran later on,
zeroing out the freelist pointers.
This meant that all slab allocators thought they were completelty
exhausted and forwarded all requests to kmalloc() instead.
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There's no need for this to be a permanent Thread member. Just use a
reference in the JoinBlocker instead.
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It's now possible to block until another thread in the same process has
exited. We can also retrieve its exit value, which is whatever value it
passed to pthread_exit(). :^)
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While executing in the kernel, a thread can acquire various resources
that need cleanup, such as locks and references to RefCounted objects.
This cleanup normally happens on the exit path, such as in destructors
for various RAII guards. But we weren't calling those exit paths when
killing threads that have been executing in the kernel, such as threads
blocked on reading or sleeping, thus causing leaks.
This commit changes how killing threads works. Now, instead of killing
a thread directly, one is supposed to call thread->set_should_die(),
which will unblock it and make it unwind the stack if it is blocked
in the kernel. Then, just before returning to the userspace, the thread
will automatically die.
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We can't use bashisms in our scripts anymore, since we're trying to
keep them POSIXy (to make them easier to run for our own shell someday)
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This patch adds pthread_create() and pthread_exit(), which currently
simply wrap our existing create_thread() and exit_thread() syscalls.
LibThread is also ported to using LibPthread.
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Also added an option in the run script to force PIO operation mode with
the IDE controller.
In addition, we're no longer limited to PIIX3 and PIIX4 chipsets for DMA
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Now that the SystemMonitor queries which open files can be read and written to,
having can_read()/can_write() unconditionally call ASSERT_NOT_REACHED() leads
to system crashes when inspecting the WindowServer.
Instead, just return true from can_read()/can_write() (indicating that the
read()/write() syscalls should not block) and return -EINVAL when trying to
actually read from or write to these devices.
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Added a script to build QEMU from source as part of the Toolchain.
The script content could be in BuildIt.sh but has been put in
a seperate file to make the build optional.
Added PATH=$PATH to sudo calls to hand over the Toolchain's PATH
setup by UseIt.sh. This enabled the script's to use the QEMU
contained in the SerenityOS toolchain.
Deleted old documentation in Meta and replaced it by a new
documentation in the Toolchain folder.
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The Launcher's functionality has been replaced by the app shortcuts in
the system menu.
There were various window management hacks to ensure that the launcher
stayed below all other windows while also being movable, etc.
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Some syscalls have to pass parameters through a struct, since we can
only fit 3 parameters with our calling convention.
This patch makes use of C++ structured binding to clean up the places
where we expand those parameters structs into local variables.
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POSIX's openat() is very similar to open(), except you also provide a
file descriptor referring to a directory from which relative paths
should be resolved.
Passing it the magical fd number AT_FDCWD means "resolve from current
directory" (which is indeed also what open() normally does.)
This fixes libarchive's bsdtar, since it was trying to do something
extremely wrong in the absence of openat() support. The issue has
recently been fixed upstream in libarchive:
https://github.com/libarchive/libarchive/issues/1239
However, we should have openat() support anyway, so I went ahead and
implemented it. :^)
Fixes #748.
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Don't wait for someone to wait() on a dead process before releasing its
TTY object. This fixes the child process death detection used by the
Terminal application, which relies on getting an EOF on the master PTY
in order to know it's time to wait() on the child process. :^)
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The SysV ABI says that the DF flag should be clear on function entry.
That means we have to clear it when jumping into the kernel from some
random userspace context.
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Instead of the big ugly switch statement, build a lookup table using
the syscall enumeration macro.
This greatly simplifies the syscall implementation. :^)
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The can_read() and can_write() states for file descriptions are now
published in /proc, allowing SystemMonitor to display it.
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Now the userspace page allocator will search through physical regions,
and stop the search as it finds an available page.
Also remove an "address of" sign since we don't need that when
counting size of physical regions
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Now the kernel page directory and the page tables are located at a
safe address, to prevent from paging data colliding with garbage.
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This was too noisy and important-sounding, when it doesn't really
matter that much. It's not the end of the world if symbolication fails
for one reason or another.
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It's not safe to use a raw pointer for Process::m_tty. A pseudoterminal
pair will disappear when file descriptors are closed, and we'd end up
looking dangly. Just use a RefPtr.
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Scheduling priority is now set at the thread level instead of at the
process level.
This is a step towards allowing processes to set different priorities
for threads. There's no userspace API for that yet, since only the main
thread's priority is affected by sched_setparam().
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Whatever this was supposed to be, it was ironically... not implemented.
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Let's arrange things like this instead. It didn't feel right for all of
the ELF handling code to live in AK.
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