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2024-11-02 15:09:10 +00:00
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21
doc/abi.txt Executable file
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=== TASK ENVIRONMENT ====
This data is placed <somewhere> in the address space
of a new task.
environment_t {
/** array of string pointers for command line arguments. */
size_t argc;
char **argv;
/** handles to the system manager and session manager services
respectively */
kern_handle_t system;
kern_handle_t session;
/** handles to the pagebuf objects storing the initial thread
stack and task heap respectively */
kern_handle_t stack;
kern_handle_t heap;
}

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doc/boot-process.txt Executable file
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================================================================================
| Rosetta Operating System |
| ~~~~~~~~~~~~~~~~~~~~~~~~ |
| The Boot Process |
================================================================================
1 Bootloader
------------
The bootloader loads the kernel executable and an initrd.
2 Kernel
--------
The kernel initialises itself, extracts the bootstrap program from the initrd
and executes it.
The initrd is an EC3 image containing (in most cases) two key items:
1) A bootstrap executable.
2) A volume containing the boot filesystem.
This data is stored in several 'tags' within the container:
* VOLU, CTAB, STAB, and XATR for the boot filesystem volume (ignored by
the kernel)
* EXEC for the bootstrap program.
(technically speaking, the only hard requirement as far as the kernel is
concerned is the EXEC tag. The initrd could contain any number of other
volumes or tags, including none at all)
The boot filesystem is ignored by the kernel. It is up to the bootstrap
program to make use of it.
The bootstrap program is a static ELF binary in an EXEC tag with an
identifier of 0x555345524C414E44 ("USERLAND" in ASCII).
The key feature of the EXEC tag in an EC3 image is that, for static and flat
binaries, it extracts the information needed to run the executable and stores
it in a special data structure for easy parsing. This allows the reader (the
kernel in this case) to load and run the executable without having to
implement an ELF parser.
Such information includes:
* The offset and size of the read-write (.data, .bss) and read-exec
(.text, .rodata) segments both in the file (source) and in virtual
memory (destination).
* The entry point address.
The following structure can be found at the beginning of the EXEC tag.
Any *_faddr variables are offsets relative to the beginning of the tag.
struct ec3_exec_aux {
uint8_t e_type; // EXEC_ELF, EXEC_FLAT, etc
union {
struct {
uintptr_t rx_segment_faddr, rx_segment_vaddr;
size_t rx_segment_fsize, rx_segment_vsize;
uintptr_t rw_segment_faddr, rw_segment_vaddr;
size_t rw_segment_fsize, rw_segment_vsize;
uintptr_t entry;
} i_elf;
struct {
uintptr_t base;
uintptr_t entry;
} i_flat;
} e_info;
}
As long as you aren't reading any volumes, the EC3 image format is simple
enough that finding the EXEC tag and reading its contents is a trivial
operation. This minimises the amount of code needed in the kernel to find
the bootstrap program.
The auxiliary information in the EXEC tag is enough for the kernel to copy
the executable into memory, set the appropriate memory permissions, and
jump to the entry point.
3 Userland Bootstrap
--------------------
The userland bootstrap program (or "userboot") is responsible for making
available the boot filesystem and starting the system management task.
Any kernel tasks have a negative task ID, and the userland bootstrap task
will always be given a task ID of zero. Therefore, the first task spawned by
userboot will always have a task ID of 1.
Once the system management process is started, userboot can (but doesn't HAVE
to) exit. The system management task will automatically become the root of
the task tree.
If userboot exits without spawning any other tasks, the action taken will
depend on the command-line arguments given to the kernel.
Some options include:
* Shut the system down
* Restart the system
* Trigger a kernel panic
In most cases, userboot will remain running, providing the system management
task with access to the boot filesystem until other drivers are online, at
which point the bootstrap program will exit.
In more specialised cases, userboot can remain running for the life of the
system. It can wait for the task it spawns to exit before taking some action.
This is useful for automated testing. The bootstrap program can run a program
that will run the test suite (or could itself be a test suite program), wait
for the tests to finish, and then shut down the system.
3 System Management Task
------------------------
The system management task will be in charge of the system for the entire
time the system is up. It is responsible for starting device drivers and
setting up an environment for the system to carry out its intended purpose
(i.e. handling interactive user sessions).
Of course, the system management task can (and certainly should) delegate
these tasks to other system services.
On Rosetta-based systems, system management duties are handled by the systemd
daemon. systemd fulfills a few important roles, including:
1) managing system services, and restarting them if they fail.
2) loading and launching executables.
3) managing the system namespace.
userboot sends commands to systemd to bring up the rest of the userland
environment. During this process, systemd maintains a connection to userboot
to load files from the boot filesystem. You might think that having two tasks
communicate with each other (violating the strict one-way client-server
message flow) would result in deadlocks, but a few key design choices in
userboot and systemd avoid this.
technically, there is nothing wrong with two tasks waiting on each other, as
long as two THREADS within those tasks don't end up (directly or indirectly)
waiting on each other.
therefore, to ensure that this principle is not violated:
1) systemd performs all process-launching activities and request-handling
activities on separate threads that never wait on each other. when a
request is received to launch a new process, systemd's request-handler
thread dispatches the request (and the responsibility to respond to the
client) to a separate loader thread. this allows systemd to continue
servicing other requests (including filesystem requests from its own
loader threads).
2) userboot performs all system startup activities (including sending
commands to systemd) and filesystem request-handing activities on
separate threads that never wait on each other.
because of this, despite the circular communications between userboot and
systemd, messages between the two tasks still technically only travel in a
single direction when you consider their individual threads:
userboot[init] -----> systemd[req-handler]
| :
═════NO═COMMUNICATION═════ : (async task dispatch)
| v
userboot[fs-handler] <----- systemd[launcher]
key:
task-name[thread-name]
---> Request/reply exchange (the arrow points toward the request
recipient)
...> Non-blocking action (e.g. scheduling another thread to run)
technically, systemd[req-handler] schedules systemd[launcher] to run and
doesn't wait on it. therefore, if userboot[init] sends a request to
systemd[req-handler] to launch a server, it will receive a reply from
systemd[launcher].
Because of the fixed order in which userboot and systemd are started, and
the deterministic assignment of task IDs mentioned in the USERLAND BOOTSTRAP
section, the channels that the two tasks use to communicate with each other
have well-defined locations:
* userboot always has TID 0, and always hosts the boot filesystem on its
first channel, giving a tuple of (nd:0, tid:0, chid:0).
* systemd always has TID 1, and always hosts its system management
interface on its first channel, giving a tuple of (nd:0, tid:1, chid:0).
5 From Userboot to the Root Filesystem
--------------------------------------
Now that we are familiar with the inner workings of these two critical tasks,
lets go through the steps taken to bring up the full userland environment:
1) when userboot starts, it is given (by the kernel) a handle to a pagebuf
object containing the initrd. userboot maps this pagebuf into its
address space and mounts the initrd[1].
2) userboot creates a new task to run the system management service.
userboot contains just enough ELF-related code to do one of the
following:
* if the system management executable is statically-linked, simply copy
the relevant ELF segments into the new task's address space and
create a thread that will start running at the executable's entry
point.
* if the system management executable is dynamically-linked (the more
likely scenario), load the dynamic linker[2] into the new task's
address space and creates a new thread that will start running at the
dynamic linker's entry point.
3) systemd initialises the system namespace and mounts the boot filesystem
provided by userboot at '/', temporarily making it the root filesystem.
4) systemd starts the device manager service, emdevd, and instructs it
to scan the system devices. this blocks systemd until the scan is
complete.
5) in response to a scan command, emdevd uses whatever drivers are
available in the current root filesystem to find and initialise as many
devices as possible. because the boot filesystem only contains the
drivers needed to mount the root filesystem, this scan will be
far from complete, but it will be repeated once the real root
filesystem is available.
6) eventually the scan will complete, and emdevd will return control
back to systemd. at this point, the storage device containing the
root filesystem has been found and brought online.
7) emdevd provides a devfs-like interface to all the devices on the
system. systemd mounts this pseudo-filesystem at '/dev' in the
system namespace.
8) systemd starts an instance of the filesystem server, fsd, and provides
it with three parameters:
* the path to the device node containing the root filesystem (e.g.
'/dev/disk0s1')
* the name of the filesystem format to be mounted (e.g. 'ext2')
* the mount flags (the root filesystem is always mounted read-only
during boot. once /etc/fstab is accessible, the root filesystem
is re-mounted with the flags it specifies)
9) fsd will load the necessary filesystem driver (e.g. for ext2
filesystems, fsd will load fs-ext2.so) and mount the filesystem
on the provided device.
10) systemd mounts the filesystem provided by fsd to the root of
the system namespace. at this point, the root filesystem is now
available (albeit read-only for now).
Notes:
[1] In this case, mounting doesn't involve the system namespace (until
systemd starts up, there *is* no system namespace), but rather
userboot creating any data structures it needs to be able to privately
locate and read files within the boot image.
[2] despite being a .so file, the dynamic linker is designed to be a
self-contained position-independent executable with no external
dependencies, in order to avoid a chicken-and-egg situation where the
dynamic linker itself requires a dynamic linker to load. the only
functionality required to load it (beyond copying its code and data
into memory) is finding and iterating through the DYNAMIC segment,
processing any relocation entries contained within.
6 Runlevels
-----------
the state of the system, and what functionality the system has, depends on
which services are running. For example:
* without deviced or fsd, no filesystems are available.
* without lockdownd, user authentication and authorisation is not
available.
* without airportd, network connectivity is not available.
* without seatd, multiplexing of peripherals between multiple user
sessions is not available.
* without sessiond, user sessions are not available.
... and so on.
different sets of services can be brought online to tailor the available
functionality. under systemd, these sets of services are called runlevels.
runlevels are hierarchical, with higher runlevels building upon the
functionality provided by lower runlevels. as the runlevel increases, the
number of system services running on the machine increases.
6.1 Pre-defined Runlevels
~~~~~~~~~~~~~~~~~~~~~~~~~
Rosetta has a range of pre-defined runlevels:
* Off:
- Instructing systemd to move to this runlevel will shut the system down.
* Minimal:
- Only the root filesystem is available, and is read-only.
- All device drivers are loaded, and all devices are visible.
- All network interfaces are down, and no socket I/O is possible.
- The security service is offline, so no authentication or authorisation
checks can be performed, and the interactive user is effectively root.
- Neither the session nor seat managers are online, so only one session
is supported.
- A basic console and shell are started to allow the user to interact
with the system.
* Single-User: Same as Minimal, except:
- all filesystems mounts prescribed by /etc/fstab are performed.
* Multi-User: Same as Single-User, except:
- The security service is running, allowing user authentication.
- System security and permissions are now enforced.
- The seat and session manager services are running, allowing multiple
user sessions to be running simultaneously.
- instead of dropping straight into a shell, the interactive user is
presented with a text-based login prompt before their shell is
launched.
* Networking: Same as Multi-User, except:
- The networking service is running, and all network interfaces are
brought up and configured according to system configuration.
* Full Mode: Same as Networking, except:
- The system's display manager is running, allowing for logging in
and interacting with the system via a graphical user interface.
In most circumstances, the system will be running in one of the runlevels
based on Multi-User. Not only does this enable most of the "usual" system
functionality, but it also enforces user authentication and authorisation.
The lower runlevels are mostly used for system administration and
troubleshooting when there is a problem preventing the system from reaching
a higher runlevel.
6.2 How Runlevels Affect Security Enforcement
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
User authentication and authorisation depend on the system security service
(lockdownd). Without it, no users can log on to the system, and no permission
checks can be performed. So, how does a system behave when lockdownd isn't
running?
There are a few circumstances where lockdownd may be offline, some
intentional and some unintentional. The system may be booted in Minimal or
Single-User mode. These runlevels don't start lockdownd as the interactive
user is root by default. However, lockdownd may crash while running on a
multi-user system.
So if you are an application or service running on a Rosetta system, and your
attempt to connect to the security service fails because the service has
stopped working, or was never running in the first place, what do you do?
The system management service keeps track of what runlevel the system is
currently running at, and anyone can contact the service to query this
information. So, you can take action depending on the system runlevel:
* If the runlevel is Single-User or below, you know that system security
is not being enforced, so there is no need to contact the security
service.
* If the runlevel is Multi-User or higher, you know that system security
is (or should be) enforced. If the security service cannot be reached
in this case, you should wait for the system management service to
(re)start it. In the worst case scenario, where the security service
cannot be started, all authentication and authorisation actions should
be presumed to fail, so that there is never a lapse in security.
7 From the Root Filesystem to User Interaction
----------------------------------------------
Now that the root filesystem is available, we can start bringing other
system components online. This process culminates in an interactive user
session.
1) systemd instructs emdevd to perform another scan of the system devices.
with a wider range of drivers now available, (hopefully) all devices
will now be detected and initialised.
2) systemd will now start working towards reaching a target runlevel.
right now, the system is running at the Minimum runlevel. For the
purposes of this document, let's assume that the target runlevel is
Networking, and the system will move through the Single-User and Multi-
User runlevels to get there.
3) In order to reach the Single-User runlevel, the filesystem mounts
specified in /etc/fstab must be performed. The Single-User runlevel
defines a script for systemd to execute, which performs the necessary
mount operations.
4) The Multi-User runlevel is more complex and will require starting a
range of services.
5) First, the security service, lockdownd, is brought online. This is the
pivotal service that converts the system from single-user to multi-user.
vim: shiftwidth=3 expandtab

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/ [nsd:0, fsd:0] (drivers/fs/fs-ec3.so)
|--svc [nsd:0]
| |--os.SystemManager -> overlordd
| |--os.Launcher -> launchd
| |--os.SeatManager -> seatd
| |--os.NetworkManager -> airportd
| |--os.DeviceManager -> emdevd
| \--os.SecurityManager -> lockdownd
|--dev [emdevd:0]
| |--zero (drivers/char/io-misc.so)
| |--null (drivers/char/io-misc.so)
| |--random (drivers/char/io-random.so)
| |--urandom (drivers/char/io-random.so)
| |--bus
| | |--pci (drivers/bus/io-pci.so)
| | | |--0000:00:00.0
| | | |--0000:00:02.0
| | | |--0000:00:05.0
| | | | ...
| | | \--0000:ff:16.7
| | |--acpi (drivers/bus/io-acpi.so)
| | | |--PNP0A03
| | | |--PNP0C0B
| | | |--PNP0900
| | | | ...
| | | \--PNP0500
| | \--usb (drivers/bus/io-xhci.so)
| | |--1-0:1.0
| | |--1-1
| | |--1-1:1.0
| | | ...
| | \--4-6:1.0
| |--block
| | |--disk0 (drivers/block/io-ahci.so)
| | |--disk0s0 (drivers/block/io-block.so)
| | |--disk0s1 (drivers/block/io-block.so)
| | |--disk1 (drivers/block/io-xhci.so)
| | \--disk1s0 (drivers/block/io-block.so)
| |--char
| | |--ser0 (drivers/char/io-serial.so)
| | |--ser1 (drivers/char/io-serial.so)
| | |--ser2 (drivers/char/io-serial.so)
| | \--ser3 (drivers/char/io-serial.so)
| |--input
| | |--event0 (drivers/input/io-ps2.so)
| | \--event1 (drivers/input/io-ps2.so)
| |--net
| | |--eth0 (drivers/net/io-e1000.so)
| | \--wlan0 (drivers/net/io-b43.so)
| \--video
| \--card0 (drivers/video/gfx-vga.so)
|--home
| \--max
| |--Downloads
| \--Documents
|--boot
| |--mango_kernel
| \--initrd.ec3
|--usr
| \--lib
| |--libsystem.so
| \--drivers
| |--bus
| | |--io-pci.so
| | |--io-acpi.so
| | \--io-xhci.so
| |--block
| | |--io-ahci.so
| | \--io-block.so
| |--char
| | \--io-serial.so
| |--input
| | \--io-ps2.so
| |--video
| | \--gfx-vga.so
| |--net
| | |--io-e1000.so
| | \--io-b43.so
| \--fs
| |--fs-ext2.so
| |--fs-fat32.so
| \--fs-ec3.so
|--net [airportd:0]
| |--node1
| | \-- ...
| \--node2
| \-- ...
\--vol
|--disk1 [fsd:0] (drivers/fs/fs-ext2.so)
\--disk2 [fsd:1] (drivers/fs/fs-fat32.so)

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Relocation section '.rela.plt' at offset 0x1af0 contains 4 entries:
Offset Info Type Sym. Value Sym. Name + Addend
00000003a018 001100000007 R_X86_64_JUMP_SLO 000000000001d2e0 _dl_catch_exception@@GLIBC_PRIVATE + 0
00000003a020 000f00000007 R_X86_64_JUMP_SLO 000000000001d110 _dl_signal_exception@@GLIBC_PRIVATE + 0
00000003a028 001f00000007 R_X86_64_JUMP_SLO 000000000001d160 _dl_signal_error@@GLIBC_PRIVATE + 0
00000003a030 002300000007 R_X86_64_JUMP_SLO 000000000001d3d0 _dl_catch_error@@GLIBC_PRIVATE + 0
No processor specific unwind information to decode
Symbol table '.dynsym' contains 40 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 000000000000af60 723 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
2: 000000000001b730 449 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
3: 000000000003b1d8 1 OBJECT GLOBAL DEFAULT 23 _[...]@@GLIBC_PRIVATE
4: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS GLIBC_2.2.5
5: 0000000000039ae0 928 OBJECT GLOBAL DEFAULT 18 _[...]@@GLIBC_PRIVATE
6: 00000000000147a0 711 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
7: 0000000000032fb0 4 OBJECT GLOBAL DEFAULT 14 __rs[...]@@GLIBC_2.35
8: 000000000003a040 4304 OBJECT GLOBAL DEFAULT 22 _[...]@@GLIBC_PRIVATE
9: 00000000000144f0 673 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
10: 0000000000039a90 8 OBJECT GLOBAL DEFAULT 18 __l[...]@@GLIBC_2.2.5
11: 0000000000039a98 4 OBJECT GLOBAL DEFAULT 18 _[...]@@GLIBC_PRIVATE
12: 00000000000051b0 59 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
13: 0000000000014a70 131 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
14: 000000000001a7d0 12 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
15: 000000000001d110 72 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
16: 000000000003b118 40 OBJECT GLOBAL DEFAULT 23 _r_debug@@GLIBC_2.2.5
17: 000000000001d2e0 227 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
18: 00000000000181d0 65 FUNC GLOBAL DEFAULT 13 __tls[...]@@GLIBC_2.3
19: 0000000000005010 35 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
20: 0000000000003300 5 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
21: 00000000000143f0 25 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
22: 000000000000e1d0 196 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
23: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS GLIBC_PRIVATE
24: 0000000000038ae8 8 OBJECT GLOBAL DEFAULT 18 __rs[...]@@GLIBC_2.35
25: 000000000002b310 5 FUNC GLOBAL DEFAULT 13 __rtl[...]@GLIBC_2.34
26: 000000000000ff20 169 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
27: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS GLIBC_2.3
28: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS GLIBC_2.4
29: 0000000000038af0 4 OBJECT GLOBAL DEFAULT 18 __rs[...]@@GLIBC_2.35
30: 0000000000017d70 109 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
31: 000000000001d160 83 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
32: 0000000000004ba0 1132 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
33: 0000000000039ac0 8 OBJECT GLOBAL DEFAULT 18 _[...]@@GLIBC_PRIVATE
34: 00000000000107b0 599 FUNC GLOBAL DEFAULT 13 _dl[...]@@GLIBC_2.2.5
35: 000000000001d3d0 69 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
36: 0000000000004aa0 244 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
37: 000000000001b660 205 FUNC GLOBAL DEFAULT 13 _[...]@@GLIBC_PRIVATE
38: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS GLIBC_2.34
39: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS GLIBC_2.35
Histogram for bucket list length (total of 37 buckets):
Length Number % of total Coverage
0 13 ( 35.1%)
1 13 ( 35.1%) 33.3%
2 8 ( 21.6%) 74.4%
3 2 ( 5.4%) 89.7%
4 1 ( 2.7%) 100.0%
Histogram for `.gnu.hash' bucket list length (total of 37 buckets):
Length Number % of total Coverage
0 12 ( 32.4%)
1 15 ( 40.5%) 38.5%
2 7 ( 18.9%) 74.4%
3 2 ( 5.4%) 89.7%
4 1 ( 2.7%) 100.0%
Version symbols section '.gnu.version' contains 40 entries:
Addr: 0x0000000000000c12 Offset: 0x000c12 Link: 5 (.dynsym)
000: 0 (*local*) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE)
004: 2 (GLIBC_2.2.5) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 6 (GLIBC_2.35)
008: 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 2 (GLIBC_2.2.5) 7 (GLIBC_PRIVATE)
00c: 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE)
010: 2 (GLIBC_2.2.5) 7 (GLIBC_PRIVATE) 3 (GLIBC_2.3) 7 (GLIBC_PRIVATE)
014: 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE)
018: 6 (GLIBC_2.35) 5h(GLIBC_2.34) 7 (GLIBC_PRIVATE) 3 (GLIBC_2.3)
01c: 4 (GLIBC_2.4) 6 (GLIBC_2.35) 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE)
020: 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 2 (GLIBC_2.2.5) 7 (GLIBC_PRIVATE)
024: 7 (GLIBC_PRIVATE) 7 (GLIBC_PRIVATE) 5 (GLIBC_2.34) 6 (GLIBC_2.35)
Version definition section '.gnu.version_d' contains 7 entries:
Addr: 0x0000000000000c68 Offset: 0x000c68 Link: 6 (.dynstr)
000000: Rev: 1 Flags: BASE Index: 1 Cnt: 1 Name: ld-linux-x86-64.so.2
0x001c: Rev: 1 Flags: none Index: 2 Cnt: 1 Name: GLIBC_2.2.5
0x0038: Rev: 1 Flags: none Index: 3 Cnt: 2 Name: GLIBC_2.3
0x0054: Parent 1: GLIBC_2.2.5
0x005c: Rev: 1 Flags: none Index: 4 Cnt: 2 Name: GLIBC_2.4
0x0078: Parent 1: GLIBC_2.3
0x0080: Rev: 1 Flags: none Index: 5 Cnt: 2 Name: GLIBC_2.34
0x009c: Parent 1: GLIBC_2.4
0x00a4: Rev: 1 Flags: none Index: 6 Cnt: 2 Name: GLIBC_2.35
0x00c0: Parent 1: GLIBC_2.34
0x00c8: Rev: 1 Flags: none Index: 7 Cnt: 2 Name: GLIBC_PRIVATE
0x00e4: Parent 1: GLIBC_2.35
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: x86 feature: IBT, SHSTK
Displaying notes found in: .note.gnu.build-id
Owner Data size Description
GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)
Build ID: 4186944c50f8a32b47d74931e3f512b811813b64
Displaying notes found in: .note.stapsdt
Owner Data size Description
stapsdt 0x00000038 NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: unmap_start
Location: 0x00000000000029ba, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -8@%r15 8@%r13
stapsdt 0x0000003b NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: unmap_complete
Location: 0x0000000000002c24, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -8@%r15 8@%rbx
stapsdt 0x0000003a NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: map_start
Location: 0x0000000000009add, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -8@40(%rbp) 8@%rbx
stapsdt 0x00000044 NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: map_complete
Location: 0x000000000000ea68, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -8@32(%rbx) 8@%r14 8@%r15
stapsdt 0x0000003f NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: reloc_start
Location: 0x000000000000eb88, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -8@32(%rbx) 8@8(%rsp)
stapsdt 0x00000049 NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: reloc_complete
Location: 0x000000000000ece6, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -8@32(%rbx) 8@8(%rsp) 8@%r15
stapsdt 0x00000035 NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: init_start
Location: 0x0000000000023300, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -4@$0 8@%rbx
stapsdt 0x00000038 NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: init_complete
Location: 0x0000000000024258, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: -4@$0 8@%rbx
stapsdt 0x0000003a NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: lll_lock_wait_private
Location: 0x0000000000026d66, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: 8@%rdi
stapsdt 0x00000032 NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: lll_lock_wait
Location: 0x0000000000026dc9, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: 8@%rdi
stapsdt 0x0000003a NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: setjmp
Location: 0x0000000000026f31, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: 8@%rdi -4@%esi 8@%rax
stapsdt 0x0000003b NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: longjmp
Location: 0x0000000000026faf, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: 8@%rdi -4@%esi 8@%rdx
stapsdt 0x00000042 NT_STAPSDT (SystemTap probe descriptors)
Provider: rtld
Name: longjmp_target
Location: 0x0000000000026fcb, Base: 0x0000000000032fc0, Semaphore: 0x0000000000000000
Arguments: 8@%rdi -4@%eax 8@%rdx

692
doc/ls.txt Executable file
View File

@@ -0,0 +1,692 @@
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Position-Independent Executable file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x6aa0
Start of program headers: 64 (bytes into file)
Start of section headers: 136232 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 13
Size of section headers: 64 (bytes)
Number of section headers: 31
Section header string table index: 30
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .interp PROGBITS 0000000000000318 00000318
000000000000001c 0000000000000000 A 0 0 1
[ 2] .note.gnu.pr[...] NOTE 0000000000000338 00000338
0000000000000030 0000000000000000 A 0 0 8
[ 3] .note.gnu.bu[...] NOTE 0000000000000368 00000368
0000000000000024 0000000000000000 A 0 0 4
[ 4] .note.ABI-tag NOTE 000000000000038c 0000038c
0000000000000020 0000000000000000 A 0 0 4
[ 5] .gnu.hash GNU_HASH 00000000000003b0 000003b0
000000000000004c 0000000000000000 A 6 0 8
[ 6] .dynsym DYNSYM 0000000000000400 00000400
0000000000000b88 0000000000000018 A 7 1 8
[ 7] .dynstr STRTAB 0000000000000f88 00000f88
00000000000005a6 0000000000000000 A 0 0 1
[ 8] .gnu.version VERSYM 000000000000152e 0000152e
00000000000000f6 0000000000000002 A 6 0 2
[ 9] .gnu.version_r VERNEED 0000000000001628 00001628
00000000000000c0 0000000000000000 A 7 2 8
[10] .rela.dyn RELA 00000000000016e8 000016e8
0000000000001410 0000000000000018 A 6 0 8
[11] .rela.plt RELA 0000000000002af8 00002af8
0000000000000960 0000000000000018 AI 6 25 8
[12] .init PROGBITS 0000000000004000 00004000
000000000000001b 0000000000000000 AX 0 0 4
[13] .plt PROGBITS 0000000000004020 00004020
0000000000000650 0000000000000010 AX 0 0 16
[14] .plt.got PROGBITS 0000000000004670 00004670
0000000000000030 0000000000000010 AX 0 0 16
[15] .plt.sec PROGBITS 00000000000046a0 000046a0
0000000000000640 0000000000000010 AX 0 0 16
[16] .text PROGBITS 0000000000004ce0 00004ce0
00000000000123a2 0000000000000000 AX 0 0 16
[17] .fini PROGBITS 0000000000017084 00017084
000000000000000d 0000000000000000 AX 0 0 4
[18] .rodata PROGBITS 0000000000018000 00018000
0000000000004dcc 0000000000000000 A 0 0 32
[19] .eh_frame_hdr PROGBITS 000000000001cdcc 0001cdcc
000000000000056c 0000000000000000 A 0 0 4
[20] .eh_frame PROGBITS 000000000001d338 0001d338
0000000000002120 0000000000000000 A 0 0 8
[21] .init_array INIT_ARRAY 0000000000020fd0 0001ffd0
0000000000000008 0000000000000008 WA 0 0 8
[22] .fini_array FINI_ARRAY 0000000000020fd8 0001ffd8
0000000000000008 0000000000000008 WA 0 0 8
[23] .data.rel.ro PROGBITS 0000000000020fe0 0001ffe0
0000000000000a78 0000000000000000 WA 0 0 32
[24] .dynamic DYNAMIC 0000000000021a58 00020a58
0000000000000200 0000000000000010 WA 7 0 8
[25] .got PROGBITS 0000000000021c58 00020c58
00000000000003a0 0000000000000008 WA 0 0 8
[26] .data PROGBITS 0000000000022000 00021000
0000000000000278 0000000000000000 WA 0 0 32
[27] .bss NOBITS 0000000000022280 00021278
00000000000012c0 0000000000000000 WA 0 0 32
[28] .gnu_debugaltlink PROGBITS 0000000000000000 00021278
0000000000000049 0000000000000000 0 0 1
[29] .gnu_debuglink PROGBITS 0000000000000000 000212c4
0000000000000034 0000000000000000 0 0 4
[30] .shstrtab STRTAB 0000000000000000 000212f8
000000000000012f 0000000000000000 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
D (mbind), l (large), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
PHDR 0x0000000000000040 0x0000000000000040 0x0000000000000040
0x00000000000002d8 0x00000000000002d8 R 0x8
INTERP 0x0000000000000318 0x0000000000000318 0x0000000000000318
0x000000000000001c 0x000000000000001c R 0x1
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000003458 0x0000000000003458 R 0x1000
LOAD 0x0000000000004000 0x0000000000004000 0x0000000000004000
0x0000000000013091 0x0000000000013091 R E 0x1000
LOAD 0x0000000000018000 0x0000000000018000 0x0000000000018000
0x0000000000007458 0x0000000000007458 R 0x1000
LOAD 0x000000000001ffd0 0x0000000000020fd0 0x0000000000020fd0
0x00000000000012a8 0x0000000000002570 RW 0x1000
DYNAMIC 0x0000000000020a58 0x0000000000021a58 0x0000000000021a58
0x0000000000000200 0x0000000000000200 RW 0x8
NOTE 0x0000000000000338 0x0000000000000338 0x0000000000000338
0x0000000000000030 0x0000000000000030 R 0x8
NOTE 0x0000000000000368 0x0000000000000368 0x0000000000000368
0x0000000000000044 0x0000000000000044 R 0x4
GNU_PROPERTY 0x0000000000000338 0x0000000000000338 0x0000000000000338
0x0000000000000030 0x0000000000000030 R 0x8
GNU_EH_FRAME 0x000000000001cdcc 0x000000000001cdcc 0x000000000001cdcc
0x000000000000056c 0x000000000000056c R 0x4
GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 RW 0x10
GNU_RELRO 0x000000000001ffd0 0x0000000000020fd0 0x0000000000020fd0
0x0000000000001030 0x0000000000001030 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .note.gnu.property .note.gnu.build-id .note.ABI-tag .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt
03 .init .plt .plt.got .plt.sec .text .fini
04 .rodata .eh_frame_hdr .eh_frame
05 .init_array .fini_array .data.rel.ro .dynamic .got .data .bss
06 .dynamic
07 .note.gnu.property
08 .note.gnu.build-id .note.ABI-tag
09 .note.gnu.property
10 .eh_frame_hdr
11
12 .init_array .fini_array .data.rel.ro .dynamic .got
Dynamic section at offset 0x20a58 contains 28 entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [libselinux.so.1]
0x0000000000000001 (NEEDED) Shared library: [libc.so.6]
0x000000000000000c (INIT) 0x4000
0x000000000000000d (FINI) 0x17084
0x0000000000000019 (INIT_ARRAY) 0x20fd0
0x000000000000001b (INIT_ARRAYSZ) 8 (bytes)
0x000000000000001a (FINI_ARRAY) 0x20fd8
0x000000000000001c (FINI_ARRAYSZ) 8 (bytes)
0x000000006ffffef5 (GNU_HASH) 0x3b0
0x0000000000000005 (STRTAB) 0xf88
0x0000000000000006 (SYMTAB) 0x400
0x000000000000000a (STRSZ) 1446 (bytes)
0x000000000000000b (SYMENT) 24 (bytes)
0x0000000000000015 (DEBUG) 0x0
0x0000000000000003 (PLTGOT) 0x21c58
0x0000000000000002 (PLTRELSZ) 2400 (bytes)
0x0000000000000014 (PLTREL) RELA
0x0000000000000017 (JMPREL) 0x2af8
0x0000000000000007 (RELA) 0x16e8
0x0000000000000008 (RELASZ) 5136 (bytes)
0x0000000000000009 (RELAENT) 24 (bytes)
0x000000000000001e (FLAGS) BIND_NOW
0x000000006ffffffb (FLAGS_1) Flags: NOW PIE
0x000000006ffffffe (VERNEED) 0x1628
0x000000006fffffff (VERNEEDNUM) 2
0x000000006ffffff0 (VERSYM) 0x152e
0x000000006ffffff9 (RELACOUNT) 201
0x0000000000000000 (NULL) 0x0
Relocation section '.rela.dyn' at offset 0x16e8 contains 214 entries:
Offset Info Type Sym. Value Sym. Name + Addend
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Relocation section '.rela.plt' at offset 0x2af8 contains 100 entries:
Offset Info Type Sym. Value Sym. Name + Addend
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No processor specific unwind information to decode
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Version symbols section '.gnu.version' contains 123 entries:
Addr: 0x000000000000152e Offset: 0x00152e Link: 6 (.dynsym)
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018: 3 (GLIBC_2.2.5) 7 (GLIBC_2.17) 3 (GLIBC_2.2.5) 3 (GLIBC_2.2.5)
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030: 3 (GLIBC_2.2.5) 3 (GLIBC_2.2.5) 3 (GLIBC_2.2.5) 3 (GLIBC_2.2.5)
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Displaying notes found in: .note.gnu.property
Owner Data size Description
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x86 ISA needed: x86-64-baseline
Displaying notes found in: .note.gnu.build-id
Owner Data size Description
GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)
Build ID: 36b86f957a1be53733633d184c3a3354f3fc7b12
Displaying notes found in: .note.ABI-tag
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 3.2.0

41
doc/protocols.txt Executable file
View File

@@ -0,0 +1,41 @@
vim: shiftwidth=3
Rosetta Operating System: Protocols
===================================
1 Introduction
--------------
Due to its nature as a message-passing operating system, a standard
"langauge" is needed in order to allow different components of the system
to communicate with each other. This document describes the communication
layer built on top of kernel IPC primitives to facilitate the fast transfer
of structured data between components.
2 Design Goals
--------------
The key consideration for Protocols is low-overhead and speed. All system
functionality is accessed via sending messages, so any speed or memory costs
incurred will affect the performance of the entire system.
In addition, Protocols should be language-agnostic. Two components written
in two different programming languages should be able to communicate as long
as they both understand the same protocol.
3 Overview
----------
Protocols is a very thin layer overtop of Mango ports. It provides a
declarative language for describing message layouts in a language-agnostic
format, and a tool for generating concrete implementations of protocols in
various programming languages.
Protocols makes heavy use of Mango's I/O vectors facility to avoid performing
any dynamic memory allocation or unnecessary copying of data. As often as
possible, any parameters you pass to a protocol function will be copied
directly into the address space of the recipient. This makes Protocols
essentially free to use.

16
doc/protocols/rosetta/io/Directory.rp Executable file
View File

@@ -0,0 +1,16 @@
mod rosetta.io;
protocol Directory;
struct Entry {
char[64] name;
}
msg Open
-> string path, i32 flags;
<- i32 status;
msg GetEntries
-> i32 count;
<-

12
doc/protocols/rosetta/io/File.rp Executable file
View File

@@ -0,0 +1,12 @@
mod rosetta.io;
protocol File:
msg Read
-> u32 count;
<- i32 status, char[] data;
msg Write
-> char[] data;
<- i32 status;

0
doc/protocols/rosetta/sys/SecurityManager.proto Executable file
View File

0
doc/protocols/rosetta/sys/SystemManager.proto Executable file
View File

9
doc/service-hierarchy.txt Executable file
View File

@@ -0,0 +1,9 @@
systemd
+--fsd [fs-ext2.so]
+--emdevd
+--lockdownd
+--seatd
+--sessiond
| +--bash
| +--nano
+--airportd

76
doc/simple.elf.dump.txt Executable file
View File

@@ -0,0 +1,76 @@
simple: file format elf64-x86-64
Disassembly of section .text:
00000000004000b0 <a>:
4000b0: 55 push %rbp
4000b1: 48 89 e5 mov %rsp,%rbp
4000b4: b8 34 12 00 00 mov $0x1234,%eax
4000b9: 5d pop %rbp
4000ba: c3 ret
00000000004000bb <b>:
4000bb: 55 push %rbp
4000bc: 48 89 e5 mov %rsp,%rbp
4000bf: b8 00 d0 00 00 mov $0xd000,%eax
4000c4: 5d pop %rbp
4000c5: c3 ret
00000000004000c6 <c>:
4000c6: 55 push %rbp
4000c7: 48 89 e5 mov %rsp,%rbp
4000ca: b8 25 00 00 00 mov $0x25,%eax
4000cf: 5d pop %rbp
4000d0: c3 ret
00000000004000d1 <_start>:
4000d1: 55 push %rbp
4000d2: 48 89 e5 mov %rsp,%rbp
4000d5: 41 54 push %r12
4000d7: 53 push %rbx
4000d8: 48 83 ec 10 sub $0x10,%rsp
4000dc: b8 00 00 00 00 mov $0x0,%eax
4000e1: e8 ca ff ff ff call 4000b0 <a>
4000e6: 41 89 c4 mov %eax,%r12d
4000e9: b8 00 00 00 00 mov $0x0,%eax
4000ee: e8 c8 ff ff ff call 4000bb <b>
4000f3: 89 c3 mov %eax,%ebx
4000f5: b8 00 00 00 00 mov $0x0,%eax
4000fa: e8 c7 ff ff ff call 4000c6 <c>
4000ff: 0f af c3 imul %ebx,%eax
400102: 44 01 e0 add %r12d,%eax
400105: 89 45 e8 mov %eax,-0x18(%rbp)
400108: 8b 15 12 11 01 00 mov 0x11112(%rip),%edx # 411220 <result_a>
40010e: 8b 45 e8 mov -0x18(%rbp),%eax
400111: 01 d0 add %edx,%eax
400113: 89 05 07 11 01 00 mov %eax,0x11107(%rip) # 411220 <result_a>
400119: 8b 15 fd 10 01 00 mov 0x110fd(%rip),%edx # 41121c <result_b>
40011f: 8b 45 e8 mov -0x18(%rbp),%eax
400122: 01 d0 add %edx,%eax
400124: 89 05 f2 10 01 00 mov %eax,0x110f2(%rip) # 41121c <result_b>
40012a: c7 45 ec 00 00 00 00 movl $0x0,-0x14(%rbp)
400131: eb 24 jmp 400157 <_start+0x86>
400133: 8b 45 ec mov -0x14(%rbp),%eax
400136: 48 98 cltq
400138: 0f b6 80 80 01 40 00 movzbl 0x400180(%rax),%eax
40013f: 89 c2 mov %eax,%edx
400141: 8b 45 e8 mov -0x18(%rbp),%eax
400144: 01 d0 add %edx,%eax
400146: 89 c2 mov %eax,%edx
400148: 8b 45 ec mov -0x14(%rbp),%eax
40014b: 48 98 cltq
40014d: 88 90 40 12 41 00 mov %dl,0x411240(%rax)
400153: 83 45 ec 01 addl $0x1,-0x14(%rbp)
400157: 8b 45 ec mov -0x14(%rbp),%eax
40015a: 3d ff ff 00 00 cmp $0xffff,%eax
40015f: 76 d2 jbe 400133 <_start+0x62>
400161: 8b 15 b9 10 01 00 mov 0x110b9(%rip),%edx # 411220 <result_a>
400167: 8b 05 af 10 01 00 mov 0x110af(%rip),%eax # 41121c <result_b>
40016d: 01 d0 add %edx,%eax
40016f: 48 83 c4 10 add $0x10,%rsp
400173: 5b pop %rbx
400174: 41 5c pop %r12
400176: 5d pop %rbp
400177: c3 ret

87
doc/simple.elf.txt Executable file
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@@ -0,0 +1,87 @@
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x4000d1
Start of program headers: 64 (bytes into file)
Start of section headers: 66560 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 2
Size of section headers: 64 (bytes)
Number of section headers: 10
Section header string table index: 9
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 00000000004000b0 000000b0
00000000000000c8 0000000000000000 AX 0 0 1
[ 2] .rodata PROGBITS 0000000000400180 00000180
0000000000010000 0000000000000000 A 0 0 32
[ 3] .eh_frame PROGBITS 0000000000410180 00010180
000000000000009c 0000000000000000 A 0 0 8
[ 4] .data PROGBITS 000000000041121c 0001021c
0000000000000004 0000000000000000 WA 0 0 4
[ 5] .bss NOBITS 0000000000411220 00010220
0000000000010020 0000000000000000 WA 0 0 32
[ 6] .comment PROGBITS 0000000000000000 00010220
0000000000000012 0000000000000001 MS 0 0 1
[ 7] .symtab SYMTAB 0000000000000000 00010238
0000000000000138 0000000000000018 8 2 8
[ 8] .strtab STRTAB 0000000000000000 00010370
0000000000000043 0000000000000000 0 0 1
[ 9] .shstrtab STRTAB 0000000000000000 000103b3
0000000000000047 0000000000000000 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
D (mbind), l (large), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000000 0x0000000000400000 0x0000000000400000
0x000000000001021c 0x000000000001021c R E 0x1000
LOAD 0x000000000001021c 0x000000000041121c 0x000000000041121c
0x0000000000000004 0x0000000000010024 RW 0x1000
Section to Segment mapping:
Segment Sections...
00 .text .rodata .eh_frame
01 .data .bss
There is no dynamic section in this file.
There are no relocations in this file.
No processor specific unwind information to decode
Symbol table '.symtab' contains 13 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 FILE LOCAL DEFAULT ABS simple.c
2: 00000000004000bb 11 FUNC GLOBAL DEFAULT 1 b
3: 0000000000411220 4 OBJECT GLOBAL DEFAULT 5 result_a
4: 000000000041121c 4 OBJECT GLOBAL DEFAULT 4 result_b
5: 0000000000400180 65536 OBJECT GLOBAL DEFAULT 2 buffer2
6: 00000000004000d1 167 FUNC GLOBAL DEFAULT 1 _start
7: 0000000000411240 65536 OBJECT GLOBAL DEFAULT 5 buffer
8: 00000000004000c6 11 FUNC GLOBAL DEFAULT 1 c
9: 0000000000411220 0 NOTYPE GLOBAL DEFAULT 5 __bss_start
10: 0000000000411220 0 NOTYPE GLOBAL DEFAULT 4 _edata
11: 0000000000421240 0 NOTYPE GLOBAL DEFAULT 5 _end
12: 00000000004000b0 11 FUNC GLOBAL DEFAULT 1 a
No version information found in this file.

86
doc/system-services.txt Executable file
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==== SERVICE LIST ==============================================================
overlordd root process, manages all system-level services
launchd launches executables
nsd manages the system namespace (aka where all filesystems are
mounted)
lockdownd implements security and authentication
sessiond manager and root process for a user session
airportd manages sockets and network communications.
emdevd host process for device drivers, one instance per system, hosts
*all* devices
seatd Manages and controls access to monitor and peripheral devices.
fsd host process for filesystem driver, one instance per mounted
filesystem
==== TASK HIERARCHY ============================================================
backboardd
+--launchd
+--nsd
+--lockdownd
+--deviced
+--airportd
+--sysfsd
+--seatd
+--sessiond
| +--window-manager
| +--file-browser
| +--web-browser
+--sessiond
| +--fbterm
| +--bshell
| +--vim
+--e2fsd
+--fatfsd
==== SERVICE DETAILS ===========================================================
## BACKBOARDD ####
* Root task (ID 1) created by the kernel during boot
* manages the startup and lifecycle of all system-level services
* Every task is provided with a handle to backboardd as part of the initial
task environment
* Backboardd can be used to gain access to certain system-level services, such
as the namespace and task launcher
## LAUNCHD ####
* Task creation service
* Accepts requests from clients to run executable files
## NSD ####
* Manages the system namespace
* Filesystems can be mounted in the system namespace to make them visible to
clients.
## LOCKDOWND ####
* Manages security and authentication
* Provides security tokens that can be associated with privileges and used
for authorisation.
## SESSIOND ####
* Root process for user login sessions.
* All child tasks receive a connection to the session controller.
* Holds session-wide data
## DEVICED ####
* Hosts all device drivers.
* Device drivers are implemented as shared libraries that are loaded into
the device server at runtime.
* Also hosts the device filesystem (usually mounted at /dev)
## SEATD ####
* Manages 'seats'.
* A seat is all of the peripherals that a user needs to interact with the
system. Includes the monitor, keyboard, and mouse.
* Allows multiple tasks to access a single seat at once. The user can use a
special keyboard shortcut to switch between tasks.
## AIRPORTD ####
* Manages remote communications.
* All open sockets are represented internally as connections to airportd.
* Supports loadable modules, which provide support for different network features,
such as unix sockets, internet sockets, and passing messages between remote machines.