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Date: Fri, 11 May 2012 20:25:00 -0000
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From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: hjl.tools@gmail.com
CC: gdb-patches@sourceware.org
In-reply-to: <20120511193114.GA5097@intel.com> (hongjiu.lu@intel.com)
Subject: Re: PATCH: Check DS segment register for x32 process
References:  <20120511193114.GA5097@intel.com>
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> Date: Fri, 11 May 2012 12:31:14 -0700
> From: "H.J. Lu" <hongjiu.lu@intel.com>
> 
> Hi,
> 
> This patch checks DS segment register for x32 process.  Tested on
> Linux/x86-64.  OK to install?
> 
> Thanks.
> 
> H.J.
> ---
> 	* amd64-linux-nat.c (AMD64_LINUX_X32_DS): New.
> 	(amd64_linux_read_description): Check DS segment register for
> 	x32 process.
> 
> diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c
> index 3be8404..97c9a49 100644
> --- a/gdb/amd64-linux-nat.c
> +++ b/gdb/amd64-linux-nat.c

> +  if (sizeof (void *) == 4 && is_64bit && !is_x32)
> +    error (_("Can't debug 64-bit process with 32-bit GDB"));

I really think we should refuse to even build a GDB as an X32 binary.