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Date: Tue, 09 May 2006 19:58:00 -0000
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From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: schwab@suse.de
CC: gdb-patches@sourceware.org
In-reply-to: <jelktb1ee9.fsf@sykes.suse.de> (message from Andreas Schwab on 	Tue, 09 May 2006 16:06:22 +0200)
Subject: Re: .eh_frame vs. .debug_frame register encoding
References:  <jelktb1ee9.fsf@sykes.suse.de>
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> From: Andreas Schwab <schwab@suse.de>
> Date: Tue, 09 May 2006 16:06:22 +0200
> 
> On powerpc the register encoding inside .eh_frame differs from the one in
> .debug_frame.  The former is using GCC internal numbering, whereas the
> latter is (of course) using the DWARF numbering.  So when gdb is reading
> .eh_frame it needs to translate the register numbers (one important
> difference is that the lr register has a different encoding).  This is a
> prerequisite for using the DWARF CFI unwinder on powerpc.

Looks reasonable to me.

> 2006-05-09  Andreas Schwab  <schwab@suse.de>
> 
> 	* dwarf2-frame.c (struct dwarf2_fde): Add eh_frame_p.
> 	(execute_cfa_program): Add parameter eh_frame_p.  Call
> 	dwarf2_frame_eh_frame_regnum when true.
> 	(dwarf2_frame_cache): Pass eh_frame_p from fde to
> 	execute_cfa_program.
> 	(decode_frame_entry_1): Call dwarf2_frame_eh_frame_regnum when
> 	processing .eh_frame.  Copy eh_frame_p to the new fde.
> 	(struct dwarf2_frame_ops): Add eh_frame_regnum.
> 	(dwarf2_frame_set_eh_frame_regnum): Define.
> 	(dwarf2_frame_eh_frame_regnum): Define.
> 
> 	* dwarf2-frame.h (dwarf2_frame_set_eh_frame_regnum): Declare.
> 	(dwarf2_frame_eh_frame_regnum): Declare.