Re: Setting up alpha stack frames

anton@mips.complang.tuwien.ac.at (Anton Ertl)
14 May 2003 00:49:23 -0400

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Re: Setting up alpha stack frames anton@mips.complang.tuwien.ac.at (2003-05-14)
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From: anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups: comp.compilers,comp.arch
Date: 14 May 2003 00:49:23 -0400
Organization: Institut fuer Computersprachen, Technische Universitaet Wien
References: 03-05-046
Keywords: architecture
Posted-Date: 14 May 2003 00:49:23 EDT

tim.jones@mail.com (Timothy Jones) writes:
>I'm having some trouble adding an instruction (even if it's a nop) to
>the start of a procedure before the stack frame is initialised. I want
>to put it here because I want it to go before any other instruction is
>executed in each basic block.
...
>hello:
> nop
> ldgp $gp,0($27)


If you insert anything before the ldgp, you have to adjust the ldgp
offset, IIRC like this:


                ldgp $gp,4($27)


(or maybe -4). The offset is the difference between the address in
$27 and the address of the ldgp pseudo-instruction.


Adding alignment after the nop is unnecessary.


- anton
--
M. Anton Ertl
anton@mips.complang.tuwien.ac.at
http://www.complang.tuwien.ac.at/anton/home.html

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