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2357 discussions

Using the HTTP server via TAP
by Peter Nguyen 03 Jun '10

03 Jun '10

Hi, I was just wondering in using TAP with the HTTP server (and following the instructions in the genode 10.02 documentation), i've noticed that when i have multiple connections to the server, whereby i have a windows xp virtual machine making requests to the server in addition to the host operating system (the XP vm is running in qemu as well as the web server), the IP addresses that the web server obtains are always the same regardless of the machine making the requests. Does anyone know how to provide unique IP addresses for each VM ie. is there an option i can/need to specify when i run qemu? or is there something i have to do with dhcpd3 or the conf,pid or lease files to ensure this functionality. Thanks Peter

3 15

Strange behaviour of member addresses
by Steffen Liebergeld 01 Jun '10

01 Jun '10

Hi, I am experiencing some strange behaviour in genode. In base/include/base/heap.h I placed debug output in the Heap::Heap constructor: Heap(Ram_session *ram_session, Rm_session *rm_session, size_t quota_limit = UNLIMITED, void *static_addr = 0, size_t static_size = 0) : _ds_pool(ram_session, rm_session), _quota_limit(quota_limit), _quota_used(0), _chunk_size(MIN_CHUNK_SIZE) { PDBG("quota_limit=%d this=0x%p &_quota_limit=0x%p", _quota_limit, (void*)this, &_quota_limit); enter_kdebug("quota_limit"); if (static_addr) _alloc.add_range((addr_t)static_addr, static_size); } This prints the following: quota_limit=-1 this=0x1851d8 &_quota_limit=0x185630 Then I placed some debug output in base/src/base/heap/heap.cc:alloc bool Heap::alloc(size_t size, void **out_addr) { /* serialize access of heap functions */ Lock::Guard lock_guard(_lock); PDBG("size=%d _quota_used=%d _quota_limit=%d *this=0x%p &_quota_limit=0x%p", size, _quota_used, _quota_limit, (void*)this, &_quota_limit); And this prints the following: _quota_limit=0 *this=0x1851d8 &_quota_limit=0x18563c Seems to me like the compiler did not correctly calculate the member addresses (this problem appears to be the same that caused the previous error I posted). Do you have an idea why that happened and how to fix it? Mand thanks in advance, Steffen Liebergeld -- Dipl.-Inf. Steffen Liebergeld <steffen@...37...> Security in Telecommunications TU Berlin/ Deutsche Telekom Laboratories Ernst-Reuter-Platz 7, 10587 Berlin Phone: +30 8353 58 263 Web: http://www.t-labs.tu-berlin.de/sect

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Rm_session_cap invalid
by Steffen Liebergeld 28 May '10

28 May '10

Hi again, during startup of the init task, the init thread tries to get an "Env::rm_session" from core. Core responds by giving it a capability with local_name() == 0, which is invalid in my context. The cap is returned from _process.rm_session_cap(), which is implemented in process.h: Rm_session_capability rm_session_cap() const {return _rm.cap(); } _rm is defined as Rm_connection in class Process. I am unsure however, which Constructor belongs to to Rm_connection, and why it sets the capability to zero. Can you help me by pointing me to the right spots? Many thanks in advance. Greetings, Steffen -- Dipl.-Inf. Steffen Liebergeld <steffen@...37...> Security in Telecommunications TU Berlin/ Deutsche Telekom Laboratories Ernst-Reuter-Platz 7, 10587 Berlin Phone: +30 8353 58 263 Web: http://www.t-labs.tu-berlin.de/sect

2 3

Announcement: Genode OS Framework version 10.05 released
by Norman Feske 27 May '10

27 May '10

We are happy to announce the new version 10.05 of the Genode OS Framework. This version brings many functional improvements, most notably a new configuration concept that allows for the definition of arbitrary client-server relationships and least-privilege policies. We also want to highlight the new audio infrastructure, which enables the playback and mixing of multiple audio streams on popular PC sound hardware. To increase the productivity for developers, there is a new build system, improving the performance on multi-processor systems. Release-notes summary for version 10.05 --------------------------------------- * Mandatory access control and session routing * Added audio-out support * OKLinux stub drivers for sound and GUI * New build system optimized for parallel builds * Arora web browser * Port of libSDL You can find the complete release notes for the version 10.05 here: http://genode.org/documentation/release-notes/10.05/ The new release is available to the project's subversion repository and at the Genode download page: http://genode.org/download/latest-release Regards -- Norman Feske Genode Labs http://www.genode-labs.com · http://genode.org Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

1 0

Init startup sequence
by Steffen Liebergeld 22 May '10

22 May '10

Hi again, I am unsure about the startup sequence of the init task (or any other task other than core, for that matter). The setup looks like this: Task Thread Core main (initializes core, sleeps) activation (used as service provider by core's threads) pager (pager for all(?) threads started by core) init(0) (service thread for init) Init init(1) Now init(1) calls init(0), does some initialization in finally gets stuck in __cxa_guard_acquire. The stack trace looks like this: ========================= 1 0x182818 .... 0x159110 __cxa_guard_acquire(T) + 0x20 = 0x1590f0 2 0x182838 32 0x15d31c Genode::env()(T) + 0x2c = 0x15d2f0 3 0x182868 48 0x1591b5 malloc(t) + 0x25 = 0x159190 4 0x182898 48 0x1596c8 __cxa_allocate_exception(T) + 0x28 = 0x1596a0 5 0x1828d8 64 0x15f00f Genode::Ipc_client::_call()(T) + 0x11f = 0x15eef0 6 0x182918 64 0x15dcb3 Genode::Parent_client::session(char const*, char const*)(W) + 0x183 = 0x15db30 7 0x1829b8 160 0x15cdf5 Genode::Platform_env::Platform_env()(W) + 0xb5 = 0x15cd40 8 0x1829d8 32 0x15d32c Genode::env()(T) + 0x3c = 0x15d2f0 9 0x182a08 48 0x1591b5 malloc(t) + 0x25 = 0x159190 10 0x182a28 32 0x157a2c __register_frame(T) + 0x2c = 0x157a00 11 0x182a38 16 0x1590e0 init_exception_handling()(T) + 0x20 = 0x1590c0 12 0x182a58 32 0x163168 _main(T) + 0x28 = 0x163140 13 0x0 .... 0x1631c0 _start(T) + 0xc = 0x1631b4 =========================== It is unclear to me, why init has to grab a lock. Is it using data structures that reside in shared memory with core? What should happen next? Many thanks in advance, Steffen -- Dipl.-Inf. Steffen Liebergeld <steffen@...37...> Security in Telecommunications TU Berlin/ Deutsche Telekom Laboratories Ernst-Reuter-Platz 7, 10587 Berlin Phone: +30 8353 58 263 Web: http://www.t-labs.tu-berlin.de/sect

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Problems with c++ exceptions
by Steffen Liebergeld 21 May '10

21 May '10

Hello Genoders, I'm having troubles with the C++ exception mechanism: In base/src/platform/_main.cc:_main(), the exception frames are set up in function init_exeption_handling(). Unfortunately, during startup of the init task, this runs into a null pointer. I could trace this back to base/src/base/cxx/exception.cc:__register_frame(__eh_frame_start), which obviously calls some gcc-provided function. I am using the toolchain you provide on your website. Did you have similar experiences during your development? Do you have an idea what is going wrong in my setup? Where should I start my investigations? Many thanks in advance, Steffen -- Dipl.-Inf. Steffen Liebergeld <steffen@...37...> Security in Telecommunications TU Berlin/ Deutsche Telekom Laboratories Ernst-Reuter-Platz 7, 10587 Berlin Phone: +30 8353 58 263 Web: http://www.t-labs.tu-berlin.de/sect

3 4

Server badges in Core
by Steffen Liebergeld 17 May '10

17 May '10

Hello friendly Genode-people, I am having difficulties unterstanding the handling of the server badge (currently in core only) As far as I understand, the badge identifies the receipient-object. Therefore the sender encodes the address of the receiving object's capability in the first slot of the send buffer. On the receiver side, in Server_activation_base::entry(), the badge is used to identify the correct object, whose dispatch() Method is then called. The server however has to insert the capability into the Object_pool first, which is done at Server_entrypoint::manage(). Now I am currently having problems in core's main function. During Ram_session_client(init_ram_session_cap).ref_account(env()->ram_session-cap()), an IPC call is sent to the "activation"-Thread, during which an invalid badge is used. Consequently the activation thread does not find the corresponding object and returns ERR_INVALID_OBJECT. This raises the following questions: a) Which object is the correct handler for this call, and b) where is the capability of the receiver allocated and registered at the Object_pool? I am looking forward to hearing from you. Many thanks in advance. Greetings, Steffen -- Dipl.-Inf. Steffen Liebergeld <steffen@...37...> Security in Telecommunications TU Berlin/ Deutsche Telekom Laboratories Ernst-Reuter-Platz 7, 10587 Berlin Phone: +30 8353 58 263 Web: http://www.t-labs.tu-berlin.de/sect

2 2

Troubles. X86: can't boot bare-metal. ARM: can't compile
by Thomas DuBuisson 04 May '10

04 May '10

Hello all, Below are two separate issues carelessly smashed into one e-mail - if you have any comments on either one then I'm all ears. -------- x86 --------- After building Genode+Fiasco [1] I can run the hello demo and scout demo (from "build/bin/*") on top of Linux, but I can't seem to boot bare metal. I'm copying the binaries from "<compound-build>/genode.fiasco_x86/bin", getting bootstrap and sigma0 from "<compound-build>/l4env/bin/...", and L4 kernel from "<compound-build>/fisco_x86/main". When I boot, the kernel starts up, prints a pc and sp (I notice "Roottask" has a stack address of all zeros). And quickly restarts. I'd paste output but it auto restarts and I don't have a serial port to over which I could collect output. The config (this is one, I've tried lots of alterations): ############## <config> <start> <filename>vesa_drv</filename> <ram_quota>2M</ram_quota> </start> <start> <filename>timer</filename> <ram_quota>0x20000</ram_quota> </start> <start> <filename>nitpicker</filename> <ram_quota>1M</ram_quota> </start> <start> <filename>hello_server</filename> <ram_quota>1M</ram_quota> </start> <start> <filename>hello_client</filename> <ram_quota>1M</ram_quota> </start> </config> ################# And the grub entry: ############# title L4 Fiasco + Genode (10.02) kernel /bootstrap -modaddr=0x03000000 module /fiasco nowait -nokdb -tbuf_entries=16384 -serial_esc module /sigma0 module /core module /init module /config module /vesa_drv module /nitpicker module /timer module /launchpad module /testnit module /scout module /nitlog module /liquid_fb module /hello_server module /hello_client ############### Any help? Let me know if you want more info. [1] http://genode.org/community/wiki/GenodeOnL4Fiasco -------- ARM -------- Separately, I'm having trouble building Fiasco on ARM - basically its missing types.h. Am I missing a step? After altering specs.conf "SPECS = genode fiasco_arm" And after setting tools.conf to point at my cross compiler: [tommd@...36... genode-arm]$ cp tool/builddir/etc/build.conf.fiasco_x86 tool/builddir/etc/build.conf.fiasco_arm [tommd@...36... genode-arm]$ ./tool/builddir/create_builddir fiasco_arm GENODE_DIR=. BUILD_DIR=~/dev/genode-arm/3rd-build/genode-fiasco_arm L4_DIR=~/dev/genode-arm/3rd-build/3rd/l4env successfully created build directory at /home/tommd/dev/genode-arm/3rd-build/genode-fiasco_arm [tommd@...36... genode-arm]$ make -C ~/dev/genode-arm/3rd-build/genode-fiasco_arm/ make: Entering directory `/home/tommd/dev/genode-arm/3rd-build/genode-fiasco_arm' Processing /home/tommd/dev/genode-arm/base-fiasco/src/core/arm/target.mk ------------------------------------------------------------------------ Library avl_tree COMPILE avl_tree_avl_tree.o MERGE avl_tree.lib.a Library slab COMPILE slab_slab.o MERGE slab.lib.a Library allocator_avl COMPILE allocator_avl_allocator_avl.o MERGE allocator_avl.lib.a Library cxx COMPILE cxx_exception.o COMPILE cxx_guard.o COMPILE cxx_malloc_free.o In file included from /home/tommd/dev/genode-arm/base/include/base/typed_capability.h:17, from /home/tommd/dev/genode-arm/base/include/parent/capability.h:17, from /home/tommd/dev/genode-arm/base/include/base/env.h:20, from /home/tommd/dev/genode-arm/base/src/base/cxx/malloc_free.cc:17: /home/tommd/dev/genode-arm/base-fiasco/include/base/capability.h:18: fatal error: l4/sys/types.h: No such file or directory compilation terminated. make[4]: *** [cxx_malloc_free.o] Error 1 make[3]: *** [cxx.tag] Error 2 make[2]: *** [all_sequence] Error 2 make[1]: *** [single_target] Error 2 make: *** [.] Error 2 make: Leaving directory `/home/tommd/dev/genode-arm/3rd-build/genode-fiasco_arm' Any help on either of these would be much appreciated. I'd love to use/contribute to Genode but if I can't build it myself / be self sufficient (perhaps I should be embarrassed) then I'm far from helpful! Cheers, Thomas

2 1

Genode-on-OKL4: Code section properties
by Frank Kaiser 03 May '10

03 May '10

Hello Recently we made an attempt to get Genode-on-OKL4 (v2.1.1.patch9) running on ARM11 (core ARM1136jf-s). The outcome was that the system stalled during initialization, because core waited endlessly for init getting started. OKL4's KDB showed that init's code section was set to read-only but not read-execute with the outrcome that the OKL4 scheduler refused to pass control to init. Interestingly this was not observed on an ARM9 platform, and we think that this just happened by chance, because the main reason of the problem seems to be how the class Dataspace_component maintains properties. In the OKL4 environment the protection domains are packed into the ELF file as modules, being itself ELF objects which are unpacked by function _setup_elf() of file base/src/base/process/process.cc. The function receives from core the capability of the ELF object (init is the first one) and parses the included segments to setup the pager. It checks whether any segment has the writable flag set. For such segments RAM is allocated and initialized, and the associated Dataspace_component gets the boolean attribute _writable set. For all other segments a Dataspace_component with the boolean attribute _writable unset is created, making no distinction between read-only and read-execute segments. The first attempt to start init leads to a page fault, and the methode Rm_client::pager() in file base/src/core/rm_session_component.cc is invoked. The method retrieves the Dataspace_component from the page fault parameters. With that a Mapping object is created to setup the response for the Ipc_pager. The constructor Mapping::Mapping() in file base-okl4/src/base/ipc/pager.cc receives the attribute _writable from the Dataspace_component. If it is set, the page attribute is set to L4_FullyAccessible, otherwise to L4_Readable. The outcome is that the code section is mapped with the X flag unset, and it is not executed while the DATA and BSS sections get the X flag set although this makes little sense. We could solve the problem by setting the page attribute to L4_Readable | L4_eXexcutable, but we still keep wondering why the problem only appears on ARM11 but neither on ARM9 or IA32, although the constructor code is always the same. Finally we think that the implementation of Dataspace_component is a bit short-handed regarding the handling of page attributes: there should be a distinction between read-only and read-execute (and DATA/BSS sections should not have the execute attribute set). At least both the ELF format and OKL4's MapControl interface maintain the full set of RWX flags. Regards Frank Kaiser OpenSynergy GmbH Rotherstr. 9 10245 Berlin Tel.: +49 (30) 20 18 18 35 28 Fax: +49 (30) 20 18 18 35 02 Email: Frank.Kaiser@...24... <mailto:andre.hergenhan@...24...> www.opensynergy.com <http://www.open-synergy.com> Handelsregister: Amtsgericht Charlottenburg, HRB 108616B Geschäftsführer: Frank-Peter Böhm, Dr. Stefaan Sonck Thiebaut, Rolf Morich

2 1

Thread blocking
by Peter Nguyen 28 Apr '10

28 Apr '10

Hi, In messing around a bit further with the http server code, I decided to have a go at making the HTTP server multithreaded. In this case, I wanted the web server to function such that when a HTTP request is received, a new thread is created whose purpose is to handle the HTTP request. In other words, the http_server_serve() function is made a thread, as opposed it being just a function. However, in making the changes, the execution seems to result in the web server hanging, with the HTTP handler thread not executing at all. This seem to be the case because inserting a call to sleep (via the timer connection) in main() resulted in the HTTP handler function executing. I would have thought that as soon as a HTTP request is received, the main thread would block, and from there schedule the HTTP handler thread (I have invoked start() on this thread, by the way). At the moment, it seems that the main thread blocking seems to result in the entire web server hanging. Any ideas as to what's going on? Peter

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