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Re: Creating a new stack from an exisiting one.

Cross-posted to 2 groups.

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On Sun, 04 Nov 2012 13:14:45 +0100, Pascal J. Bourguignon wrote:

> Well, I don't know of any processor that uses a separate stack for the
> frame pointers.  See for example the instructions LINK and UNLK of the
> 680x0 (there are similar instructions on X86 and others).  The top frame
> pointer is usually kept in A6, while the stack pointer is A7=SP.
>
I can name two for you. Both are Motorola parts, though they belong to 
different chipsets:

MC6809
====== - an 8/16 bit chip, has two stack pointers, S and U. Both can be 
mapped anywhere in RAM. The S pointer is used during subroutine calls, 
while the U pointer is available for use as a secondary stack: unlike the 
S pointer, there are no automatic operations tied to it, so it will only 
be be changed by user-written instructions such as PSHU, PULU, LEAU and 
LDU.     

MC68000
=======, its variants and derivatives, e.g. 68000, 68008, 68020, 68030 
and 68040. These have a file of 8 32 bit address registers. In a similar 
way to the 6809, any or all of the 8 can be used as stack pointers, i.e. 
all can by the subject of push and pop instructions, but D7 (also 
referred to as SP) is used as the system stack for subroutine calls, etc.

HTH


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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Thread

Creating a new stack from an exisiting one. Chad <cdalten@gmail.com> - 2012-11-03 07:45 -0700
  Re: Creating a new stack from an exisiting one. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-11-03 15:51 +0000
    Re: Creating a new stack from an exisiting one. Chad <cdalten@gmail.com> - 2012-11-03 09:22 -0700
      Re: Creating a new stack from an exisiting one. markspace <-@.> - 2012-11-03 11:20 -0700
      Re: Creating a new stack from an exisiting one. "BartC" <bc@freeuk.com> - 2012-11-03 18:58 +0000
      Re: Creating a new stack from an exisiting one. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2012-11-04 00:49 +0100
      Re: Creating a new stack from an exisiting one. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-11-04 00:44 +0000
        Re: Creating a new stack from an exisiting one. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2012-11-04 13:14 +0100
          Re: Creating a new stack from an exisiting one. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-11-04 12:48 +0000
            Re: Creating a new stack from an exisiting one. Thomas Richter <thor@math.tu-berlin.de> - 2012-11-04 14:14 +0100
              Re: Creating a new stack from an exisiting one. Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-11-04 15:38 +0000
            Re: Creating a new stack from an exisiting one. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2012-11-04 14:41 +0100
          Re: Creating a new stack from an exisiting one. "BartC" <bc@freeuk.com> - 2012-11-04 14:11 +0000
            Re: Creating a new stack from an exisiting one. "Pascal J. Bourguignon" <pjb@informatimago.com> - 2012-11-04 16:00 +0100
          Re: Creating a new stack from an exisiting one. markspace <-@.> - 2012-11-04 11:02 -0800
          Re: Creating a new stack from an exisiting one. Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-04 19:56 +0000
    Re: Creating a new stack from an exisiting one. Jeff Higgins <jeff@invalid.invalid> - 2012-11-03 16:46 -0400
      Re: Creating a new stack from an exisiting one. Jeff Higgins <jeff@invalid.invalid> - 2012-11-04 08:22 -0500
        Re: Creating a new stack from an exisiting one. Jeff Higgins <jeff@invalid.invalid> - 2012-11-04 11:30 -0500
          Re: Creating a new stack from an exisiting one. Jeff Higgins <jeff@invalid.invalid> - 2012-11-04 19:40 -0500
  Re: Creating a new stack from an exisiting one. Lew <lewbloch@gmail.com> - 2012-11-03 16:02 -0700

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