[Info-vax] Android development Was Re: OT: Larry Ellison takes retirement as CEO of Oracle

[Johnny Billquist]

On 2014-09-21 08:37, JF Mezei wrote:
> On 14-09-21 01:41, David Froble wrote:
>
>> x86 has an instruction set.
>>
>> If you can get some x86 instructions into memory, and get them to start
>> executing, that would be an issue.
>
> The VMS image activator would need to be modified to detect a Linux
> image, and likely invoke some Unix emulator that would provide the
> dynamic linking to Unix-like libraries built on VMS, and more
> importantly, capture any internal unix calls and emulate Linux' expected
> behaviour.
>
> Consider code that has all the opcodes to setup a Unix IO call to output
> "Hello World" to stdout.  The emulator would have to trap the IO
> instruction, interpret the environment and then issue the equivalent
> $QIO to send "Hello World" to "stdout" (assumed to be a logical poiting
> to SYS$OUTPUT).

Essentially correct, although there are no IO instructions per se, but 
various system calls, both for loading in dynamic libraries, grabbing 
memory, and doing I/O.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
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