may turn into exceptions on Mach: a small message sent by the kernel to
the task that requested the exception.
On Darwin, when an exception is sent, no signal can be delivered.
TODO: more exceptions: arithmetic, bad instructions, emulation, s
software, and syscalls (plain and Mach). There is also RPC alert, but
I have no idea about what it is.
While we are there, remove some user ktrace in notification code, and add
a NODEF qualifier in mach_services.master: it will be used for notifications
and exceptions, where the kernel is always client and never server: we
don't want the message to be displayed as "unimplemented xxx" in kdump (thus
UNIMPL is not good), but we don't want to generate the server prototype
(therefore, STD is not good either). NODEF will declare it normally in the
name tables without creating the prototype.
1) make sure Mach servers will not work on data beyond the end of the
request message buffer.
2) make sure that on copying out the reply message buffer, we will not
leak kernel data located after the buffer.
3) make sure that the server will not overwrite memory beyond the end
of the reply message buffer. That check is the responsability of the
server, there is just a DIAGNOSTIC test to check everything is in
good shape. All currently implemented servers in NetBSD have been
modified to check for this condition
While we are here, build the mach services table (formerly in mach_namemap.c)
and the services prototypes automatically from mach_services.master, just
as this is done for system calls.
The next step would be to fold the message formats in the mach_services.master
file, but this tends to be difficult, as some messages are quite long and
complex.
Darwin specific files. The handler does nothing yet.
This needs some improvement. Darwin attaches an IOHIDSystem device to
each human-interface device in the tree: mouse, keyboard, and a few others.
For now we only emulate one IOHIDSystem device.
- introduce mach_port_destroy (badly emulated for now)
- on fork/exec, don't set l_private, as the process might be not mature
enough to survive a proc_representative_lwp call (-> kernel panic)
Once we give WindowServer the io_master_port, it sends a message to it:
305 WindowServer MMSG id 2804 [0x1310009 -> 0x131000e] -12016 bytes, flags 0
x1513
0x0000 0x00001513 0xffffd110 0x0131000e 0x01310009 .........1...1..
0x0010 0xffffcfd0 0x00000af4 0x00000000 0x00000000 ................
0x0020 0xffffcf60 0x00000052 0x3c646963 0x74204944 ...`...R<dict ID
0x0030 0x3d223022 0x3e3c6b65 0x793e494f 0x50726f76 ="0"><key>IOProv
0x0040 0x69646572 0x436c6173 0x733c2f6b 0x65793e3c iderClass</key><
0x0050 0x73747269 0x6e672049 0x443d2231 0x223e494f string ID="1">IO
0x0060 0x48494453 0x79737465 0x6d3c2f73 0x7472696e HIDSystem</strin
0x0070 0x673e3c2f 0x64696374 0x3e0047cc g></dict>.G.
Did you ever dreamt about system call arguments in XML?
send, send once, and dead names, not for port sets and receive rights.
This make vi and telnet able to work again.
Also removed the all process right list and its lock, which got useless. The
all process lock is replaced by a per process lock, located in struct
mach_emuldata.
Also one bug fix: we did not correctly called Mach hooks for struct emuldata
initialization and release for Darwin processes.
the right in the destination process.
This is a small step backward for functionnality: vi does not work anymore
because our right checks cause some spurious errors, but this will be fixed
later.
and a body.
- If mach_init is not availabkle for boostrap requests, try to handle them
in the kernel (we don't really handle them, we just try to avoid hanging there)
- minor tweaks.
1) rights should be shared by the threads within a process. While it would
be easier to handle this with the struct proc/struct lwp split, we attempt to
do this now by sharing the right lists. Because each right holds a reference
to struct proc, this might cause some problems later.
2) in pthread_exit, really exit the thread. Also reintialize the righ tlist to
make sure we will not destroy the parent's right list
3) rights can hold multiple permissions on a port (ie: send and receive). Fix th
is.
4) first attempt on right carried by messages. We still have to do rights carrie
d in the message body (complex messages).
keep track of the receive right for the port. There can be only one, and
the receive right references struct proc should we need it.
This makes easier to find the receive right associated with the port.
This does not buy us new functionnality for now, because we still have to
discover how mach_init (which acts as a name server, enabling processes to
discover each other's ports) is able to receive messages from other processes
(this is a bootstrap problem, and the bootstrap port might be the place to
search).
While we are there:
- removed a lot of debug which is now available using ktrace.
- reworked message handling to avoid mutliple copyin/copyout of the
same data. ktrace of Mach message now uses the in-kernel copy of the
message instead of copying it from userland.
- packed mach trap handlers arguments into a structure to avoid modifying
everything next time we have to add an argument.
mach_port_move_member, mach_port_set_attributes, mach_task_set_special_port,
(none do anything)
Added mach_thread_create_running, which creates a new Mach thread. It
provides the register context of the new thread. We use it in a child
function provided to fork1(). The child function is machine dependent and
is not yet implemented for i386.
The new thread crashes quickly, but at least it starts.
Check for target buffer length, and fail if it is too short
Move mach_msg_trap and mach_msg_overwrite_trap to their own file
Remove some useless debug messages now we have ktrace
Remove __P()
manu