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Frame pointer register name
- From: Amittai Aviram <amittai dot aviram at yale dot edu>
- To: gcc-help at gcc dot gnu dot org
- Date: Fri, 14 Jan 2011 15:34:34 -0500
- Subject: Frame pointer register name
I am creating a GCC (4.5.2) that uses a modified libgomp. My libgomp has a file that contains the following line of code:
asm volatile("mov %%rbp, %0" : "=m" (rbp) );
I attempted to compile this on a 64-bit machine running under 64-bit Ubuntu:
$ uname -a
Linux dedis 2.6.32-27-server #49-Ubuntu SMP Thu Dec 2 02:05:21 UTC 2010 x86_64 GNU/Linux
But my build failed, with the assembler error that "rbp" was an unrecognized register name. I changed this to ebp, and it compiled fine. However, my code then failed, presumably because it was getting an invalid address.
I figured out a workaround that seems fine, but I wanted to know why I was getting this assembler error and what I should have done about it.
Thank you!
Amittai Aviram
PhD Student in Computer Science
Yale University
646 483 2639
amittai.aviram@yale.edu
http://www.amittai.com