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Author SHA1 Message Date
Andreas Kling
509e5f9952 Add some basic address validation to syscalls. 
This is extremely ineffcient, but it doesn't really matter yet.
 2018-10-27 00:29:24 +02:00
Andreas Kling
2716a9e2d7 Greatly improve /proc/PID/stack by tracing the ebp frame chain. 
I also added a generator cache to FileHandle. This way, multiple
reads to a generated file (i.e in a synthfs) can transparently
handle multiple calls to read() without the contents changing
between calls.

The cache is discarded at EOF (or when the FileHandle is destroyed.)
 2018-10-27 00:14:24 +02:00
Andreas Kling
c928b06218 Add a very hackish /proc/PID/stack. 
It walks the stack and identifies anything that looks like a kernel symbol.
This could be a lot more sophisticated.
 2018-10-26 22:33:15 +02:00
Andreas Kling
81627cf7d5 Add a simple /proc/mounts that enumerates the current VFS mounts. 2018-10-26 18:43:25 +02:00
Andreas Kling
a447359916 Add a /proc/kmalloc stats file. 2018-10-26 18:28:25 +02:00
Andreas Kling
edb81a635c Fix bug where you couldn't "cd .." into the root of a mounted fs. 2018-10-26 18:19:31 +02:00
Andreas Kling
a32b3a3ddf Implement /proc/PID/vm. 
Refactored SyntheticFileSystem to maintain an arbitrary directory structure.
ProcFileSystem creates a directory entry in /proc for each new process.
 2018-10-26 17:44:19 +02:00
Andreas Kling
10347b9ae8 Add ASSERT_INTERRUPTS_DISABLED in Task::fromPID(). 2018-10-26 15:11:29 +02:00
Andreas Kling
63e5583c18 Properly null-terminate the argv list created by sh. 2018-10-26 15:04:20 +02:00
Andreas Kling
1c45b28da6 Add sys$uname() and a /bin/uname utility. 2018-10-26 14:57:26 +02:00
Andreas Kling
384e2f24d4 Add per-task limit for open fd's. Hard-coded at 16 for now. 2018-10-26 14:30:38 +02:00
Andreas Kling
2749e7f1c2 Implement sys$chdir() and teach sh+ls to cd around and browse different dirs. 2018-10-26 14:24:11 +02:00
Andreas Kling
ac738b03d6 Add memcpy() and strcmp() to LibC. 2018-10-26 13:32:13 +02:00
Andreas Kling
0af9254812 If spawning a task fails after we did a partial ELF load, remap current. 
This is an annoying issue. It'd be nice if this code didn't have to worry
about preserving the calling task's mappings.
 2018-10-26 12:22:22 +02:00
Andreas Kling
546ddd7de0 Remove logspam in /dev/{full,null,zero} now that they work just fine. 
Also don't echo anything to console when putch'ing '\0'.
 2018-10-26 11:27:42 +02:00
Andreas Kling
6312c3f253 Fix mixup between /dev/null and /dev/zero device registration. 2018-10-26 11:25:46 +02:00
Andreas Kling
df87dda63c Implement argc/argv support for spawned tasks. 
Celebrate the new functionality with a simple /bin/cat implementation. :^)
 2018-10-26 11:16:56 +02:00
Andreas Kling
53abfa7ea1 Add sys$gethostname and /bin/hostname 2018-10-26 09:54:29 +02:00
Andreas Kling
3faaa3e04a Add /bin/false and /bin/true for fun. :^) 2018-10-25 21:39:37 +02:00
Andreas Kling
dc6f57f19c Add gettimeofday() syscall and LibC wrappers gettimeofday() and time(). 
This only has second accuracy right now, I'll work out subseconds later.
 2018-10-25 17:36:18 +02:00
Andreas Kling
5978185242 Add a "sleep" syscall that sleeps for N seconds. 2018-10-25 13:56:03 +02:00
Andreas Kling
c6f2890d8e Implement a basic way for read() to block. 
FileHandle gets a hasDataAvailableForRead() getter.
If this returns true in sys$read(), the task will block(BlockedRead) + yield.
The fd blocked on is stored in Task::m_fdBlockedOnRead.
The scheduler then looks at the state of that fd during the unblock phase.

This makes "sh" restful. :^)

There's still some problem with the kernel not surviving the colonel task
getting scheduled. I need to figure that out and fix it.
 2018-10-25 13:09:56 +02:00
Andreas Kling
ba56f4afde If no context switch occurs, add 1 to the timesScheduled() for current. 
This seems like more accurate accounting.
 2018-10-25 12:45:29 +02:00
Andreas Kling
571dc8234f Make the stage2 init task sleep dreamily when finished. 
Something is off about scheduling, I don't think the kernel is handing
out all the available time to processes that are available to run.
 2018-10-25 12:40:17 +02:00
Andreas Kling
fdc782c1d1 Add a very naive block cache to the DiskBackedFileSystem. 
This would be a lot better as an LRU. Right now it's a 32-slot
hash table with random eviction.
 2018-10-25 12:36:50 +02:00
Andreas Kling
82bbfa8496 Keyboard should support the space character (jeez!) 2018-10-25 12:10:25 +02:00
Andreas Kling
260b14e505 Implement errno in LibC. 
This also meant I had to implement BSS (SHT_NOBITS) sections in ELFLoader.
I also added an strerror() so we can print out what the errors are.
 2018-10-25 12:06:50 +02:00
Andreas Kling
434b6a8688 Unify the Task constructors. 
There's now Task::create() and Task::createKernelTask().
 2018-10-25 11:17:47 +02:00
Andreas Kling
dff516f6d0 Remove unused Task states. 2018-10-25 10:51:51 +02:00
Andreas Kling
4bd69d4352 Remove old DatBuffer class. 
(also increase the number of sectors loaded by the bootloader in the
since I just noticed we were at the limit. This is not the ideal way
of doing this.)
 2018-10-25 10:50:30 +02:00
Andreas Kling
de7c54545a Remove age-old IPC stuff that wasn't working anyway. 
I'll make a fresh start with IPC code when I get there.
 2018-10-25 10:39:39 +02:00
Andreas Kling
ce126120d1 Add a few more InterruptDisablers. 2018-10-25 10:33:10 +02:00
Andreas Kling
1c49b34b93 Selectively disable interrupts in MM. 
Also added an ASSERT_INTERRUPTS_DISABLED() macro.
 2018-10-25 10:15:28 +02:00
Andreas Kling
86a547dcac Add parent PIDs to /proc/summary 2018-10-25 10:15:13 +02:00
Andreas Kling
16f318408d ELFLoader should fail with an error message for unresolved symbols. 2018-10-25 10:02:04 +02:00
Andreas Kling
ec1d16b307 Add a "pwd" utility to userland. 
It's implemented as a separate process. How cute is that.
Tasks now have a current working directory. Spawned tasks inherit their
parent task's working directory.
Currently everyone just uses "/" as there's no way to chdir().
 2018-10-24 14:28:22 +02:00
Andreas Kling
eb4074bb9d Put more logspam behind EXT2_DEBUG. 2018-10-24 13:38:53 +02:00
Andreas Kling
5f36a5f22e Add an lstat() syscall and use it to make "ls" nicer. 2018-10-24 13:19:36 +02:00
Andreas Kling
bca4b71bfa Lots of hacking to make a very simple "ls" utility. 
I added a dead-simple malloc that only allows allocations < 4096 bytes.
It just forwards the request to mmap() every time.

I also added simplified versions of opendir() and readdir().
 2018-10-24 12:50:07 +02:00
Andreas Kling
0c5bbac86e Add an InterruptDisabler helper class and use that for kmalloc. 
The naive spinlock was not nearly enough to protect kmalloc from
reentrancy problems.

I don't want to deal with coming up with a fancy lock for kmalloc
right now, so I made an InterruptDisabler thingy instead.
It does CLI and then STI iff interrupts were previously enabled.
 2018-10-24 11:07:53 +02:00
Andreas Kling
9a296d63f3 Add simplified mmap() and munmap() syscalls. 2018-10-24 09:48:41 +02:00
Andreas Kling
a5caf7ca99 Make the kmalloc global stats variable volatile. 
I know I'm praying for cargo here, but this does fix a weird issue
where logging the sum_alloc and sum_free globals wouldn't display
symmetric values all the time.
 2018-10-24 01:04:06 +02:00
Andreas Kling
82dae8fc90 Add a kmalloc lock. This definitely reduces flakiness. 2018-10-24 00:51:19 +02:00
Andreas Kling
8e27cf2428 Cleanup. 2018-10-24 00:51:09 +02:00
Andreas Kling
57136ad87e synthfs: generated files should have size=0. 
This way we don't need to generate the file just to see how big it would get.
 2018-10-24 00:50:23 +02:00
Andreas Kling
b40c851fce Unbreak crashy user process test. 2018-10-24 00:35:07 +02:00
Andreas Kling
3253a23b91 Add a simplified waitpid() so that sh can wait on spawned commands. 2018-10-24 00:20:34 +02:00
Andreas Kling
018da1be11 Generalize the SpinLock and move it to AK. 
Add a separate lock to protect the VFS. I think this might be a good idea.
I'm not sure it's a good approach though. I'll fiddle with it as I go along.

It's really fun to figure out all these things on my own.
 2018-10-23 23:34:05 +02:00
Andreas Kling
e4bfcd2346 Add "times scheduled" field to /proc/summary 2018-10-23 15:59:38 +02:00
Andreas Kling
44045b258c Teach MM to flush individual TLB entries only. 2018-10-23 15:53:11 +02:00