Frame pointer register name

Amittai Aviram
Fri Jan 14 20:34:00 GMT 2011

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

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