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To: "Maciej W. Rozycki" <macro@mips.com>
Cc: gdb-patches@sourceware.org,  Nigel Stephens <nigel@mips.com>, 	  Chris Dearman <chris@mips.com>, 	  "Maciej W. Rozycki" <macro@linux-mips.org>
Subject: Re: Use the address mask with addresses for SREC, etc.
References: <Pine.LNX.4.61.0707241740390.20726@perivale.mips.com>
From: Jim Blandy <jimb@codesourcery.com>
Date: Wed, 25 Jul 2007 17:53:00 -0000
In-Reply-To: <Pine.LNX.4.61.0707241740390.20726@perivale.mips.com> (Maciej W. Rozycki's message of "Tue, 24 Jul 2007 18:34:29 +0100 (BST)")
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It's my understanding that addresses are signed on MIPS architectures,
and thus 32-bit SREC files are only capable of addressing locations
0xffffffff80000000 -- 0x000000007fffffff.  And that the issue you're
fixing here arises from BFD handing you addresses read from an SREC
file (which is using 32-bit addresses) in the 0x80000000 -- 0xffffffff
range.  Is that right?

I'm not too happy with complicating code in GDB because BFD is
providing it with the wrong addresses.  I have to imagine the same
thing would happen elsewhere.  When BFD reads the SREC file, does it
have any idea that it's a MIPS SREC file?  It looks like
bfd_get_sign_extend_vma doesn't know about MIPS SREC targets; would
fixing that, and then bfd/srec.c, help us get the right addresses into
the BFD?