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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Kernel Syscall from Ada?
Date: Thu, 12 Jul 2018 15:59:19 -0500
Organization: JSA Research & Innovation
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Date: 2018-07-12T15:59:19-05:00
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"Dan'l Miller" <optikos@verizon.net> wrote in message 
news:e9c05e73-ea72-4fc5-a671-fecd3fdf0c11@googlegroups.com...
...
>One of the more succinct summaries of the legacy 8086, 32-bit x86, and 
>64-bit x86-64:
>https://stackoverflow.com/questions/12806584/what-is-better-int-0x80-or-syscall
>
>Randy is mostly accurate:  interrupt 80?? has faded into antiquity and 
>currently
>everything about system calls boils down to C subprograms.

Interesting; I've never seen anything about Linux system traps in the past. 
That would make it easier to port Janus/Ada to Linux without having to 
involve GCC (one would want an *option* to link with GCC, but ideally no 
*requirement* to do that). The old SCO Unix compiler directly used system 
traps to talk to the kernel; no C libraries were required. That meant it was 
easy to create Ada programs just using Ada tools and there wasn't any 
dependencies on anything else. That's not really practical for Windows, so 
I'm surprised to find out that Linux is more like the old MS-DOS and Unix 
systems in this regard.

                                          Randy.