From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cagney <ac131313@cygnus.com>
To: Fernando Nasser <fnasser@redhat.com>
Cc: gdb-patches@sources.redhat.com, Nick Clifton <nickc@cygnus.com>
Subject: Re: RFA: [buildsym.c]  Turn off unused addr bits in linetable
Date: Tue, 13 Mar 2001 08:52:00 -0000
Message-id: <3AAE3502.BFFE90D2@cygnus.com>
References: <3AAD70B6.A9C16F36@redhat.com>
X-SW-Source: 2001-03/msg00190.html

Fernando Nasser wrote:
> 
> Some systems like ARM may have extra bits set in the address to indicate
> a mode or something else (the LSB=1 means thumb mode for ARM).
> 
> So, before storing line number addresses we may need to turn this bits
> off as they may be passed to gdb with the bits on as result of
> relocation (ld has no way of knowing it is for a line table entry).
> 
> The following patch passes the line addresses through the target
> dependent macro ADDR_BITS_REMOVE() before storing it on the table.
> 
> OK to commit?
> 
> ChangeLog:
> 
>         * buildsym.c (record_line): Turn off unused addr bits.

I'm not sure about this.  The ARM has two ways of identifying THUMB code
- the LSB and a tacky symbol lookup.

Others, such as MIPS/MIPS16 don't.  I'm not sure how this will affect
that target.  Does the code that uses this address of line also ``turn
off unused addr bits''?

	Andrew