Lynd, Eugene (Contractor) (J6C) wrote:
Tony expressed my view of the problem very well - sorry I didn't. Typically
when we use the Disassembler it is for very old code. But since there is in
fact an OPTABLE parameter documented, that suggests IBM also sees the need for
the feature. My questio
Tony Harminc wrote:
>It's useful to limit the opcodes understood, because the disassembler (any
>disassembler for this architecture - not just IBM's) is less than perfect at
>understanding what is code and what is data. If you know something about the
>module you are working on (typically it is so
Craddock, Chris wrote:
if it were archaic, or "dead" code, the length of the operands is
dictated by the 1st two bits of the opcode so the disassembler would
presumably skip the correct number of bytes and interpret the next
instruction correctly. In other words it would get back into it's stride
On Thu, 8 Nov 2007 16:07:15 -0600 Tony Harminc <[EMAIL PROTECTED]> wrote:
:>On Thu, 8 Nov 2007 13:43:23 -0600, Roland Schiradin <[EMAIL PROTECTED]> wrote:
:>>doesn't make sense to me. If an instruction exists in the code the
disassembler
:>>should decode them based on the latest level of possibl
Roland Schiradin wrote:
>
> >doesn't make sense to me. If an instruction exists in the code the
> disassembler
> >should decode them based on the latest level of possible opcodes. Why
> would
> >you limit this?
It's all a guess. One would typically assume that, if you're
disassembling code that r
On Thu, 8 Nov 2007 13:43:23 -0600, Roland Schiradin <[EMAIL PROTECTED]> wrote:
>doesn't make sense to me. If an instruction exists in the code the disassembler
>should decode them based on the latest level of possible opcodes. Why would
>you limit this?
It's useful to limit the opcodes understood
Farley, Peter x23353 wrote:
Any idea which opcodes are duplicates? Where are the vector facility
opcodes documented?
I don't know about official IBM documentation, but Abe Kornelis has an
excellent overview at his hlasm.com site. Check this out:
http://www.hlasm.com/english/opcd00.htm
C
> -Original Message-
> From: Edward Jaffe [mailto:[EMAIL PROTECTED]
> Sent: Thursday, November 08, 2007 3:13 PM
> To: IBM-MAIN@BAMA.UA.EDU
> Subject: Re: OPTABLE option of Disassembler
>
> David Cole wrote:
> > Because sometimes opcodes change meanings? Correct
> -Original Message-
> From: IBM Mainframe Discussion List
> [mailto:[EMAIL PROTECTED] On Behalf Of Edward Jaffe
> Sent: Thursday, November 08, 2007 2:13 PM
> To: IBM-MAIN@BAMA.UA.EDU
> Subject: Re: OPTABLE option of Disassembler
>
>
> David Cole wrote:
&g
> -Original Message-
> From: IBM Mainframe Discussion List
> [mailto:[EMAIL PROTECTED] On Behalf Of Edward Jaffe
> Sent: Thursday, November 08, 2007 2:13 PM
> To: IBM-MAIN@BAMA.UA.EDU
> Subject: Re: OPTABLE option of Disassembler
>
>
> David Cole wrote:
&g
David Cole wrote:
Because sometimes opcodes change meanings? Correct me if I'm wrong,
but it seems to me that some of the new opcodes that came out in the
late 90s were the same as some of the old vector processor opcodes. ...
I never knew that! I always assumed all new opcodes were completely
Because sometimes opcodes change meanings? Correct me if I'm wrong,
but it seems to me that some of the new opcodes that came out in the
late 90s were the same as some of the old vector processor opcodes. ...
Dave Cole REPLY TO: [EMAIL PROTECTED]
Cole Software WEB PAGE: ht
Hi Gene,
doesn't make sense to me. If an instruction exists in the code the disassemble
should decode them based on the latest level of possible opcodes. Why would
you limit this?
Roland
>The High level Assembler accepts and uses an OPTABLE parm which lets
>you limit the valid op codes to an
Lynd, Eugene (Contractor) (J6C) wrote:
The High level Assembler accepts and uses an OPTABLE parm which lets
you limit the valid op codes to an architecture level such as XA or
370 (and optionally list the valid OP codes at that level). The Disassembler
(ASMDASM) has a comparable SPTABLE option w
The High level Assembler accepts and uses an OPTABLE parm which lets
you limit the valid op codes to an architecture level such as XA or
370 (and optionally list the valid OP codes at that level). The Disassembler
(ASMDASM) has a comparable ÓPTABLE option which "Specifies the operation
code table
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