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Re: Changes required for x86 address spaces
- From: Pedro Alves <palves at redhat dot com>
- To: Richard Henderson <rth at redhat dot com>, Gary Benson <gbenson at redhat dot com>, "H.J. Lu" <hjl dot tools at gmail dot com>
- Cc: GDB <gdb at sourceware dot org>
- Date: Wed, 21 Oct 2015 19:36:34 +0100
- Subject: Re: Changes required for x86 address spaces
- Authentication-results: sourceware.org; auth=none
- References: <5626BF4A dot 2080600 at redhat dot com> <CAMe9rOoOR5qC_r3DKk+_NX_dLm33iWHQ4MSgoAYsAtrkOHp5hA at mail dot gmail dot com> <20151021081610 dot GA13381 at blade dot nx> <5627CFB6 dot 1050809 at redhat dot com>
On 10/21/2015 06:47 PM, Richard Henderson wrote:
> I was thinking the same thing. Presumably all one needs to do is define new
> architecture registers and fill in the blanks. But I've lost track of how to
> do that these days; it seems to be scattered across 19 different files...
Yeah, on x86-64, fs_base and fs_base are available in user_regs_struct
nowadays, thus accessible with PTRACE_PEEKUSER and PTRACE_GETREGSET.
Basically you need to:
- add new gdb register numbers to amd64-tdep.h
- add the ptrace/gdb register mapping to amd64-linux-tdep.c:amd64_linux_gregset_reg_offset
- add new xml files to gdb/features/i386/
- make gdb/x86-linux-nat.c:x86_linux_read_description return the new description.
Thanks,
Pedro Alves