* runtime systems
@ 2008-05-03 19:35 emconuk
2008-05-04 2:51 ` Lucretia
2008-05-04 5:57 ` anon
0 siblings, 2 replies; 5+ messages in thread
From: emconuk @ 2008-05-03 19:35 UTC (permalink / raw)
Hello.
I would like to find out some more about available Ada runtime
systems.
I know that Adacore have a runtime system ported to various cross
platforms (but I can't figure out its licensing), and I know about the
other commercial offerings from GHS and Aonix. I'm also aware of
MarteOS and RTEMS as possible non-commericial offerings.
However, I would like to hear about any other solutions out there. I
used to use xd-ada and it had quite a simple little rts that could be
customised for different hardware platforms. I don't want an OS - I
just want to hear about baremetal runtime systems.
For example, I really like the look of the latest Gaisler Reasearch
LEON3 processor and perhaps other FPGA soft-cores. Anyone have a non-
commericial Ada rts running on those type of platforms ?
thanks.
Martyn
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: runtime systems
2008-05-03 19:35 runtime systems emconuk
@ 2008-05-04 2:51 ` Lucretia
2008-05-04 16:44 ` Ed Falis
2008-05-04 5:57 ` anon
1 sibling, 1 reply; 5+ messages in thread
From: Lucretia @ 2008-05-04 2:51 UTC (permalink / raw)
On 3 May, 20:35, emconuk <emco...@googlemail.com> wrote:
> Hello.
>
> I would like to find out some more about available Ada runtime
> systems.
>
> I know that Adacore have a runtime system ported to various cross
> platforms (but I can't figure out its licensing), and I know about the
> other commercial offerings from GHS and Aonix. I'm also aware of
> MarteOS and RTEMS as possible non-commericial offerings.
MarteOS and RTEMS are both operating systems, not runtimes.
> However, I would like to hear about any other solutions out there. I
> used to use xd-ada and it had quite a simple little rts that could be
> customised for different hardware platforms. I don't want an OS - I
> just want to hear about baremetal runtime systems.
You need to look into the GNAT sources and work out how to port the
GNAT runtime to your preferred hardware.
I don't think it'd be possible to move an Ada runtime from 1 compiler
to another without porting it properly as the compilers create code
that references the runtime in compiler-specific ways.
Luke.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: runtime systems
2008-05-03 19:35 runtime systems emconuk
2008-05-04 2:51 ` Lucretia
@ 2008-05-04 5:57 ` anon
1 sibling, 0 replies; 5+ messages in thread
From: anon @ 2008-05-04 5:57 UTC (permalink / raw)
In <5b8b9ed2-e03b-4f97-8666-9a11a5450a32@w74g2000hsh.googlegroups.com>, emconuk <emconuk@googlemail.com> writes:
>Hello.
>
>I would like to find out some more about available Ada runtime
>systems.
>
>I know that Adacore have a runtime system ported to various cross
>platforms (but I can't figure out its licensing), and I know about the
>other commercial offerings from GHS and Aonix. I'm also aware of
>MarteOS and RTEMS as possible non-commericial offerings.
>
First, for commercial Ada(s). Most Ada vendors are Intel/Mac systems.
There are others such as IBM versions which can be use on AIX, Linux,
or Windows systems.
Now, for non-commericial Ada most programmers use GNAT.
For "GNAT Ada 2005" and a number of "GNAT Ada 95" versions, the
license is GPL 2 which has been updated to GPL 3 in a number of ports.
All ports of the compiler must also be under GPL 2 or 3 and open source
only (see "GNAT Technology FAQ" at libre.adacore.com).
As for MarteOS and RTEMS OSs they use GNAT as their main language and
have ported the existing GNAT RTL to fit their code. But the bootstrap
and startup code is still written in C and ASM. License is GPL 2 or 3.
>
>However, I would like to hear about any other solutions out there. I
>used to use xd-ada and it had quite a simple little rts that could be
>customised for different hardware platforms. I don't want an OS - I
>just want to hear about baremetal runtime systems.
>
>For example, I really like the look of the latest Gaisler Reasearch
>LEON3 processor and perhaps other FPGA soft-cores. Anyone have a non-
>commericial Ada rts running on those type of platforms ?
>
As for a new RTL. The GNAT RTL uses both Ada and interface C
routines to link into the OS which must be rewritten. The C code is
used because Ada and GNAT does not support conditional compiling.
The RTL is only part of the problem the main isuue is the compiler.
The GNAT compiler uses a two phases compiler system to generate
code. The main compiler program is called GNAT1 and starts in file
"gnat1drv.adb" which translates the Ada source code into the target
processor assembly code. This is done by GNAT1 first calling the
frontend compiler ("Frontend.adb") which is written in Ada (no
modification is needed). Then if code is to be generated, GNAT1
calls the Backend routine ("back_end.adb") which in turn calls a C
routine (GNAT GIGI) found in file "trans.c" to perform the source code
generation for the object computer (major modification is needed to
produce code for new processor). (Up to 500K lines of code). Then the
second phase is to call the an assembler (GCC "as") to processor the
object code for that processor if GNAT1 finishes with no errors (must
have or write a ported version of the GCC "as"). These two phases are
perform at the request of the GCC "gcc" compiler.
So, first look for a GCC C compiler package for the processor that you
wish to use. This package should have the GCC C compiler "gcc", an
assembler "as" as well as the linker "ln" with libraries. And if your
luck you may find an GNAT Ada port or links to an Ada project, there.
>
>thanks.
>Martyn
>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: runtime systems
2008-05-04 2:51 ` Lucretia
@ 2008-05-04 16:44 ` Ed Falis
2008-05-04 19:08 ` Lucretia
0 siblings, 1 reply; 5+ messages in thread
From: Ed Falis @ 2008-05-04 16:44 UTC (permalink / raw)
On Sat, 03 May 2008 22:51:42 -0400, Lucretia <lucretia9@lycos.co.uk> wrote:
> I don't think it'd be possible to move an Ada runtime from 1 compiler
> to another without porting it properly as the compilers create code
> that references the runtime in compiler-specific ways.
I presented a paper at SigAda '82 on a portable run-time library interface
based on my post-grad work of the time. Boy, that sure went over big ;-)
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: runtime systems
2008-05-04 16:44 ` Ed Falis
@ 2008-05-04 19:08 ` Lucretia
0 siblings, 0 replies; 5+ messages in thread
From: Lucretia @ 2008-05-04 19:08 UTC (permalink / raw)
On 4 May, 17:44, "Ed Falis" <fa...@verizon.net> wrote:
> On Sat, 03 May 2008 22:51:42 -0400, Lucretia <lucret...@lycos.co.uk> wrote:
> > I don't think it'd be possible to move an Ada runtime from 1 compiler
> > to another without porting it properly as the compilers create code
> > that references the runtime in compiler-specific ways.
>
> I presented a paper at SigAda '82 on a portable run-time library interface
> based on my post-grad work of the time. Boy, that sure went over big ;-)
Got a link? What compilers did it work with? Any? :D
Luke.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2008-05-03 19:35 runtime systems emconuk
2008-05-04 2:51 ` Lucretia
2008-05-04 16:44 ` Ed Falis
2008-05-04 19:08 ` Lucretia
2008-05-04 5:57 ` anon
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