[ nasm-Bugs-2840300 ] Macho alignment broken

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Bugs item #2840300, was opened at 2009-08-19 08:26
Message generated for change (Comment added) made by kkanios
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Category: Assembler
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
>Assigned to: Keith Kanios (kkanios)
Summary: Macho alignment broken

Initial Comment:
Hi,

after switching to the latest NASM 2.07, my MacOSX program suddenly segfaulted all-over the place.

It turned out that 16-byte alignment doesn't work anymore in the latest NASM 2.07, breaking SSE instructions.

Here is the code snippet I use in the asm file (am I doing something wrong?):

section .data align=16
_ssg_step: dd 0,0,0,0
_ssg_cubelenm1vec: dd 0,0,0,0
_pme_gridbins: dd 0,0,0,0

After linking the NASM created Macho object code with GCC object code, the address of _ssg_step above was 16 byte aligned with my previous NASM version, but is 2 byte aligned with the latest NASM 2.07.

BTW, my previous nasm -v output was
NASM version 0.98.40 (Apple Computer, Inc. build 11) compiled on Jan 14 2007

I don't remember how or why I ended up with the version above, it could mean that I had the alignment problem already previously, and found that Apple provided a fixed/patched NASM version...?

How do others use SSE code in Macho objects?

Thanks for your help,
Elmar


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>Comment By: Keith Kanios (kkanios)
Date: 2009-10-16 22:09

Message:
I've isolated the issue and checked-in a fix. Look for it in NASM 2.08.

----------------------------------------------------------------------

You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=106208&aid=2840300&group_id=6208

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