Re: [patch] Pushing Inferior Function Arguments onto Stack on PowerPC64 machines

[Daniel Jacobowitz <drow@false.org>]

On Tue, Oct 03, 2006 at 02:11:30PM -0500, Janani Janakiraman wrote:
> This fixes a problem on Powerpc 64 machines while running gdb on 64 bit 
> programs. The problem is with the alignment of the function arguments
> when they are pushed to the stack in the ppc64_sysv_abi_push_dummy_call.
> GCC expects the values to be right aligned.

Is Andrew's comment about the ABI correct, or incorrect?  Do you know
for sure?

> ! 		      /* WARNING: cagney/2003-09-21: As best I can
> ! 		         tell, the ABI specifies that the value should
> ! 		         be left aligned.  Unfortunately, GCC doesn't
> ! 		         do this - it instead right aligns even sized
> ! 		         values and puts odd sized values on the
> ! 		         stack.  Work around that by putting both a
> ! 		         left and right aligned value into the
> ! 		         register (hopefully no one notices :-^).
> ! 		         Arrrgh!  */

-- 
Daniel Jacobowitz
CodeSourcery