Paul Gilmartin wrote:
On Mon, 4 Jun 2018 16:58:31 +0000, Seymour J Metz wrote:
PER uses program interrupts, not an SVC.
That said, calling an SVC does not normally alter R14; the SVC would have to do
something unusual.
Does either PER or SVC preserve the program mask (CC, ILC, ...)?
If so, that's the one dbx ought to use.
Saving these things can be important if you break just before an IPM
instruction.
-- gil
It's not the saving of the registers/PSW state that is at question, it's the
changing of it.
Imagine you're debugging a program and hit a break-pt, and would like to
change a register/PSWA before continuing... that's what we're talking
about here.
IBM provides the facilities to do this for all the registers _except_ R14.
- Dave R. -
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