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Date: Sun, 13 Nov 2005 18:17:00 -0000
From: Daniel Jacobowitz <drow@false.org>
To: gdb-patches@sourceware.org
Subject: Re: [rfa] Use a different breakpoint instruction for EABI GNU/Linux
Message-ID: <20051113181014.GC2635@nevyn.them.org>
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References: <20051111220241.GA30323@nevyn.them.org> <1131801657.9711.0.camel@pc960.cambridge.arm.com>
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On Sat, Nov 12, 2005 at 01:20:57PM +0000, Richard Earnshaw wrote:
> On Fri, 2005-11-11 at 22:02, Daniel Jacobowitz wrote:
> > Patches have been posted recently for the Linux kernel to use a different
> > interface for system calls, in which r7 holds the syscall number instead of
> > embedding it in the SWI.  With old-ABI compatibility mode disabled, the
> > kernel never looks in the SWI at all.  Which means that using a SWI
> > to set a breakpoint doesn't work very well.
> > 
> > Since 2003 the kernel has supported these particular undefined instructions
> > (in the reserved space) as breakpoints.  So if we see an EABI binary, assume
> > we have a recent vintage of kernel, and use them.
> > 
> > Tested on arm-none-linux-gnueabi.  OK for HEAD and 6.4?
> 
> OK.

Thanks, committed.

-- 
Daniel Jacobowitz
CodeSourcery, LLC