This is the mail archive of the gdb-patches@sources.redhat.com mailing list for the GDB project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: RFA/ARM: Switch mode when setting PC

From: Andrew Cagney <cagney at gnu dot org>
To: Richard dot Earnshaw at arm dot com
Cc: Daniel Jacobowitz <drow at mvista dot com>,gdb-patches at sources dot redhat dot com
Date: Sat, 17 Jan 2004 11:02:13 -0500
Subject: Re: RFA/ARM: Switch mode when setting PC
References: <200401171049.i0HAnJ722639@pc960.cambridge.arm.com>

On Fri, Jan 16, 2004 at 02:12:18PM -0500, Andrew Cagney wrote:

> Or a lack of design, Arm needs to ensure that it doesn't define PC_REGNUM.

OK, I'll keep that in mind.

> >In the past we've tried to distinguish R15 from PC. This was especially > >useful in the legacy 26-bit mode where the CPSR bits *were* in R15.
Perhaps, in that case, we should have the PC as a pseudoregister.  That
would simplify a lot of arm-tdep.c.
That was my feeling too.

BTW, the user visible $pc is now typically per-frame and tied to the "unwound return address". If that pseudo-register were made visible things could get confusing.

Andrew

References:
- Re: RFA/ARM: Switch mode when setting PC
  - From: Richard Earnshaw

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]