System Debug Reference Manual (32650-90888)

Chapter 6 239

System Debug Command Speciﬁcations M-X

Examples

%cmdebug > mr cmpc

CMPC=PROG %0.01754 := prog(0.1762)

Modify the contents of the CM program counter. Only the offset portion of the CM logical

address can be modiﬁed. It is not possible to change the logical segment number portion.

Note that this also modiﬁes CIR, the current instruction register.

%cmdebug > mr x 0

X=000123 := 0

Zero the X register.

$nmdebug > mr pc pc + 4

pc=0021d7b4 := 0021d7b8

Advance the PC (this changes pcq front and pcq back).

$nmdebug > mr ret0 [psp-20]

r28=00000001 := 00ef2340

Modify return register 0 (r28) to be the contents of the address speciﬁed by psp-20.

Limitations, Restrictions

The PC register can not be modiﬁed unless the user has privileged mode.

When CM code has been translated, and is executing translated, modiﬁcation of the CM

registers may result in an undeﬁned/undesirable state.

Refer to appendix C for a discussion of CM object code translation, node points, and

breakpoints in translated CM code.

Enters native mode (nmdat / nmdebug). See the CM command.

Syntax

The command switches from CM (cmdat/cmdebug) to NM (nmdat/nmdebug). If the

windows are on, the screen is cleared and the set of windows enabled for nmdebug are

redrawn. The command also sets several environment variables. The variables affected

and their new values are shown below:

ENV MODE "NM"

ENV INBASE NM_INBASE

ENV OUTBASE NM_OUTBASE