Re: [seL4] How to edit RefOS libs c file

Hi ぷ风过无痕, CIDL is an in-house language and compiler. As Kevin said, it was built by a student who has moved on to other things. Below I've reproduced some internal documentation on it. However, I suspect the best way to understand it is to dive into the source code. Matt -- CIDL -- CIDL is a quick straightforward IDL compiler which generates stubs from a simple XML format IDL. CIDL aims to have processes in seL4 talking to each other with minimal work involved. CIDL expects a backing interface underneath, and one using pure seL4 IPC buffers has been supplied. The idea is that the user may simply switch their backing interface over to use shared buffers / passing pages around / whatever when they have the infrastructure to support it, and everything hopefully just works. Features: - Integers, C strings, generic types & structs, arrays - Distinguishes between input / output arguments - Return values - Cap transfer - Save-and-reply-later supported (useful for async) IDL Language: CIDL uses a simple XML-based IDL language, based somewhat loosely on seL4's syscall XML IDL. XSD spec for the IDL language: http://www.w3.org/2001/XMLSchema"> xs:complexType xs:sequence xs:sequence xs:complexType xs:simpleContent xs:simpleType xs:simpleType Example XML conforming to this spec: <?xml version="1.0" ?> <interface label_min='0x5000' connect_ep=''> <include>stdio.h</include> <include>test_types.h</include> <function name="test_function1" return='seL4_CPtr'> TEST FUNCTION 1 </function> <function name="test_function2" return='int'> TEST FUNCTION 2 <param type="seL4_CPtr" name="session" mode="connect_ep"/> <param type="uintptr_t" name="a"/> <param type="uintptr_t*" name="b" dir="out"/> <param type="err_t*" name = "f" /> <param type="int*" name="c" mode="array" lenvar="lenv"/> <param type="int" name="lenv" mode="length" /> </function> </interface> -- end -- On 22/06/15 15:37, Kevin Elphinstone wrote:

Refos was a student project, and as typical of student projects, the documentation patchy. The student is no longer with us.

I think your best bet is to learn how it works. The advantage of most student projects, is that they don’t have time to make anything too big or complex J

-Kevin

*From:*Devel [mailto:devel-bounces@sel4.systems] *On Behalf Of *??????? *Sent:* Monday, 22 June 2015 2:52 PM *To:* devel-request *Subject:* [seL4] How to edit RefOS libs c file

Hi,

I am using RefOS to develop a small applicaiton(interprocess comunicaion).I need to edit some c files in RefOS/libs/librefos directory,But comments say that do not edit these files,these files were generated by CIDL.CIDL is a simple C IDL compiler which is made to save the trouble of manually implementing RPC interface stubs to marshal C style arguments and return value. It uses a simple XML-based IDL language. I search on the google，but just got some introduction. So where can I got some useful infomation about CIDL? Can you recommend some books or websites?

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*Date: * Sun, Jun 21, 2015 10:00 AM

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*Subject: * Devel Digest, Vol 13, Issue 11

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1. Re: Devel Digest, Vol 13, Issue 10_Bare Metal support for GCC (da Tyga)

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Message: 1 Date: Sat, 20 Jun 2015 16:26:46 +1000 From: da Tyga mailto:cyberfonic@gmail.com> To: devel@sel4.systems mailto:devel@sel4.systems Subject: Re: [seL4] Devel Digest, Vol 13, Issue 10_Bare Metal support for GCC Message-ID: mailto:CALj3Nd3+CFFQF41BOwW+-bwFNOEZS9HyVLHDwVssTyMAcsU3ig@mail.gmail.com> Content-Type: text/plain; charset="utf-8"

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Hi Yuxin,

I don't think you need to modify GCC, it is the compiler that you can use to generate required executables. Making changes to it is a massive undertaking.

Instead of trying to reinvent stuff that has already been done, you really should read the Genode documentation and download and read the source code referenced by Norman Feske's suggestions.

...

From my reading of the Genode documents and source code, I would expect that you would find a considerable amount of code that you could you re-purpose for your specific requirements.

Cheers, Tyga

...

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Message: 1 Date: Fri, 19 Jun 2015 22:46:40 +0800 From: Yuxin Ren mailto:ryx@gwmail.gwu.edu> To: Norman Feske mailto:norman.feske@genode-labs.com> Cc: "devel@sel4.systems mailto:devel@sel4.systems" mailto:devel@sel4.systems> Subject: Re: [seL4] Does sel4 support c++ Message-ID: mailto:P_tW5bS2LUfPzHcBF-iMKg@mail.gmail.com> Content-Type: text/plain; charset="utf-8"

Thank you all!

If modifying the tool chain is the easiest way, I want to try it. But I definitely want to avoid creating the tool chain from "bare metal". I still prefer to reuse the existing tool chain like gcc with minimal modification.

Could you give me some guidance how to create a custom tool chain, which part I need to modify? I am not familiar with gcc. So if I have to modify gcc, where can I get more information or documentation?

Thanks a lot!! Yuxin

On Thu, Jun 18, 2015 at 9:50 PM, Norman Feske < norman.feske@genode-labs.com mailto:norman.feske@genode-labs.com> wrote:

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Hello,

...

The easiest approach is possibly to create a custom tool chain, and port the GCC C++ library that way. I know the people behind Genode did some of this (http://genode.org/download/tool-chain), although I'm not sure how much of the C++ standard library they actually support.

more in-depth information about Genode's tool chain are provided by Section 7.2 of the documentation [1]. In short, the tool chain is a "bare metal" tool chain that does not depend on a C library, yet it still supports C++ (including exceptions and runtime type information).

On Genode, the libc and STL (aka stdcxx) can be used optionally whereas the STL depends on the libc. The libc is based on FreeBSD's libc. The STL is GCC's version. Both libraries are available via Genode's ports mechanism.

That said, as both the libc and stdcxx are shared libraries, they cannot be used on the seL4 version of Genode as of now. Shared libraries don't work on seL4 (at least on x86_32) because the system-call bindings cannot be compiled with -fPIC.

[1] http://genode.org/documentation/genode-foundations-15-05.pdf

Best regards Norman

-- Dr.-Ing. Norman Feske Genode Labs

http://www.genode-labs.com ? http://genode.org

Genode Labs GmbH ? Amtsgericht Dresden ? HRB 28424 ? Sitz Dresden Gesch?ftsf?hrer: Dr.-Ing. Norman Feske, Christian Helmuth

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