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Author SHA1 Message Date
Andreas Kling
fdbd9f1e27 Start working on memory-mapped files. 
First of all, change sys$mmap to take a struct SC_mmap_params since our
sycsall calling convention can't handle more than 3 arguments.

This exposed a bug in Syscall::invoke() needing to use clobber lists.
It was a bit confusing to debug. :^)
 2018-11-08 11:40:58 +01:00
Andreas Kling
41a751c90c Minor tweak to /bin/kill. 2018-11-08 02:07:08 +01:00
Andreas Kling
71a2942a0a Make it run in QEMU. 
Looks like the problem was the weirdly-sized floppy image file.
I guess QEMU was inferring the floppy disk geometry from the image size.
 2018-11-08 02:03:19 +01:00
Andreas Kling
da3857b0c2 Add some simple write buffering to LibC's stdio. 
Plumb it all the way to the VirtualConsole. Also fix /bin/cat to write()
the whole chunks we get from read() directly to stdout.
 2018-11-08 01:23:47 +01:00
Andreas Kling
e287f8ef3a The colonel task already had a halt loop. 
Also don't reap() current in the scheduler, just wait until it's not current.
 2018-11-08 00:30:35 +01:00
Andreas Kling
ac1d12465f Move timer tick handling into Scheduler. 2018-11-08 00:26:04 +01:00
Andreas Kling
27fded7002 Unbreak signal delivery to userspace again. 
My my, this code is quite fickle.
 2018-11-08 00:08:50 +01:00
Andreas Kling
1dbc340da8 Get rid of the undertaker and have waitpid() be the reaper. 
For dead orphans, the scheduler calls reap().
 2018-11-07 23:59:49 +01:00
Andreas Kling
f792349853 Unbreak sys$sigreturn() after colonel process changes. 2018-11-07 23:21:32 +01:00
Andreas Kling
43f40a3050 Finally unbreak the colonel process and make it the true idle process. 2018-11-07 23:14:56 +01:00
Andreas Kling
440029c9d1 Reduce number of passes in the scheduler by 2. 2018-11-07 22:24:20 +01:00
Andreas Kling
39d2fcbbee Move the scheduler code to its own class. 
This is very mechanical.
 2018-11-07 22:15:02 +01:00
Andreas Kling
6304c771dd Some refactor and style tweaks. 2018-11-07 21:38:18 +01:00
Andreas Kling
03a8357e84 Implement sending signals to blocked-in-kernel processes. 
This is dirty but pretty cool! If we have a pending, unmasked signal for
a process that's blocked inside the kernel, we set up alternate stacks
for that process and unblock it to execute the signal handler.

A slightly different return trampoline is used here: since we need to
get back into the kernel, a dedicated syscall is used (sys$sigreturn.)

This restores the TSS contents of the process to the state it was in
while we were originally blocking in the kernel.

NOTE: There's currently only one "kernel resume TSS" so signal nesting
definitely won't work.
 2018-11-07 21:19:47 +01:00
Andreas Kling
c8b308910e Signals to processes in userspace now work again. 
Ugh, how am I going to dispatch signals to processes in the kernel?
 2018-11-07 19:03:44 +01:00
Andreas Kling
dd887e158b Add a /proc/PID/regs that shows register state from the process's TSS. 2018-11-07 18:40:29 +01:00
Andreas Kling
678882e020 Rework process states to make a bit more sense. 
Processes are either alive (with many substates), dead or forgiven.
A dead process is forgiven when the parent waitpid()s on it.
Dead orphans are also forgiven.

There's a lot of work to be done around this.
 2018-11-07 18:34:37 +01:00
Andreas Kling
71bffa9864 Fix whiny build. 2018-11-07 16:38:45 +01:00
Andreas Kling
61a84193d7 Fix some broken stuff in VFS test environment. 
It's still lagging behind the metal environment but here's some work towards
fixing it at least.
 2018-11-07 15:51:39 +01:00
Andreas Kling
981a3ae4b3 Make VFS test environment build again. 2018-11-07 12:05:51 +01:00
Andreas Kling
83172e6a4b Rename FileHandle to FileDescriptor. 2018-11-07 11:37:54 +01:00
Andreas Kling
e088121b3a Fix sys$sigaction() to return the old action metadata if requested. 2018-11-07 10:48:44 +01:00
Andreas Kling
0b3e927597 Oops, waitpid() was not passing the options parameter to the kernel. 2018-11-07 10:46:48 +01:00
Andreas Kling
d7a41579e5 Miscellaneous compat work while seeing if GNU coreutils would build. 2018-11-07 10:23:16 +01:00
Andreas Kling
a7f1d892a9 Add some basic setgroups(), getgroups() and initgroups(). 
Also teach /bin/id to print the user's supplemental groups.
 2018-11-07 01:38:51 +01:00
Andreas Kling
d3bd3791cb Minor fixes in getgrent() and getpwent() function families. 2018-11-07 00:33:10 +01:00
Andreas Kling
8135952832 Add a Chomp feature to String construction that removes a trailing newline. 
This will be useful in many situations.
 2018-11-07 00:19:35 +01:00
Andreas Kling
90bab5ea71 Add getgrent() family of functions. 2018-11-06 22:27:51 +01:00
Andreas Kling
e5e0bffd76 Add getwd(). 2018-11-06 15:59:57 +01:00
Andreas Kling
7c3746592b Add strsignal() and improve sharing signal numbers between LibC and kernel. 2018-11-06 15:45:16 +01:00
Andreas Kling
8d1f8b2518 Add sys_nerr and sys_errlist. 
Also keep the canonical errno list in LibC for now. The kernel gets it
from there. This makes building 3rd party code easier.

..also fix broken strchr().
 2018-11-06 14:42:28 +01:00
Andreas Kling
b2d23f83ab Add umask(). 2018-11-06 13:47:56 +01:00
Andreas Kling
77fe8e8363 Add getppid(). 2018-11-06 13:33:57 +01:00
Andreas Kling
3024167cbd Change syscall naming scheme. 2018-11-06 13:33:54 +01:00
Andreas Kling
46f0c28a4a Add sigset_t helper functions to LibC. 2018-11-06 12:02:58 +01:00
Andreas Kling
153ea704af Add some basic signal support. 
It only works for sending a signal to a process that's in userspace code.

We implement reception by synthesizing a PUSHA+PUSHF in the receiving process
(operating on values in the TSS.)
The TSS CS:EIP is then rerouted to the signal handler and a tiny return
trampoline is constructed in a dedicated region in the receiving process.

Also hacked up /bin/kill to be able to send arbitrary signals (kill -N PID)
 2018-11-06 10:56:41 +01:00
Andreas Kling
52d502e11f Remove some no longer used files. 2018-11-05 19:20:10 +01:00
Andreas Kling
9f2b9c82bf More work towards getting bash to build. 
Implemented some syscalls: dup(), dup2(), getdtablesize().
FileHandle is now a retainable, since that's needed for dup()'ed fd's.
I didn't really test any of this beyond a basic smoke check.
 2018-11-05 19:01:59 +01:00
Andreas Kling
82f84bab11 More random compat hacking towards getting bash to build. 
I'm now at the build stage where it complains about a bajillion missing
symbols. This is a good place to be!
 2018-11-05 18:21:42 +01:00
Andreas Kling
e76312ab63 Lots of minor compat stuff while seeing if bash would build. 
We're quite far from bash building, but we'll get there eventually!
 2018-11-05 16:40:48 +01:00
Andreas Kling
e4611248c4 Add geteuid() and getegid(). 
There's no support for set-uid or set-gid executables yet so these don't
actually do anything. It's just nice to get the boilerplate stuff in.
 2018-11-05 15:05:27 +01:00
Andreas Kling
60a8144b68 Add stub fflush(). 2018-11-05 14:56:05 +01:00
Andreas Kling
8039a20611 Tiny LibC things. 2018-11-05 14:54:11 +01:00
Andreas Kling
9e62eb4856 Only COW on fault if the physical page has retain_count > 1. 
This makes COW pages lazily-but-transparently revert back to read/write.
 2018-11-05 14:11:21 +01:00
Andreas Kling
2d045d2a64 Implement COW pages! :^) 
sys$fork() now clones all writable regions with per-page COW bits.
The pages are then mapped read-only and we handle a PF by COWing the pages.

This is quite delightful. Obviously there's lots of work to do still,
and it needs better data structures, but the general concept works.
 2018-11-05 13:48:07 +01:00
Andreas Kling
e85c22fe58 Tidy up the page fault code a bit in preparation. 2018-11-05 10:29:19 +01:00
Andreas Kling
72cdc62155 Replace zones with individually tracked physical pages. 
It's just a simple struct { ref_count, paddr }.
This will allow me to implement lazy zeroing and COW pages.
 2018-11-05 10:23:00 +01:00
Andreas Kling
b5c5286ee1 Tidy up ELFLoader. 2018-11-04 14:11:16 +01:00
Andreas Kling
422b5403e5 Merge ExecSpace into ELFLoader. 2018-11-04 13:52:53 +01:00
Andreas Kling
d90b891406 Remove bootstrapping code from ELFLoader. 
This runs inside the kernel now, and I no longer need the emulated version.
 2018-11-04 13:44:17 +01:00