3 Sep
2014
3 Sep
'14
1:13 a.m.
They avoid self-modifying code, in cases where there
are hardware or
religious reasons to do so.
Forgive my slowness, but I've having a hard time seeing how this would
work. Could you point me to any examples?
On 2 September 2014 17:19, John Wilson <wilson at dbit.com> wrote:
On Tue, Sep 02, 2014 at 05:05:20PM -0600, Kevin Keith
wrote:
--
Thanks,
Kevin
As I understand it, what these instructions do is
basically jump to a
word in memory, execute that word as an instruction, and them jump
right back. What were the usages of these in standard code? What was
the rationale behind them?
They avoid self-modifying code, in cases where there are hardware or
religious reasons to do so.
The EX instruction on the S/360 also lets you apply a value from a
register to an instruction where the value would be hard-coded, so
this makes it possible to use MVC etc. with a variable-length string.
John Wilson
D Bit