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Re: [PATCH 1/3] Include asm/ptrace.h in mips-linux-nat.c
- From: Yao Qi <yao at codesourcery dot com>
- To: "Maciej W. Rozycki" <macro at codesourcery dot com>
- Cc: <gdb-patches at sourceware dot org>
- Date: Fri, 14 Jun 2013 10:39:14 +0800
- Subject: Re: [PATCH 1/3] Include asm/ptrace.h in mips-linux-nat.c
- References: <1369881867-11372-1-git-send-email-yao at codesourcery dot com> <1369881867-11372-2-git-send-email-yao at codesourcery dot com> <alpine dot DEB dot 1 dot 10 dot 1306131752490 dot 16287 at tp dot orcam dot me dot uk>
On 06/14/2013 01:37 AM, Maciej W. Rozycki wrote:
../../src/gdb/mips-linux-nat.c:599: error: storage size of 'dummy_regs' isn't known
etc. for the very reason the system I used for testing has old kernel
headers installed (2.6.19 it would seem, according to <linux/version.h>).
Such a failure is not acceptable from the user's point of view; I think
there are three ways to deal with this:
1. Add an autoconf test that checks for the presence of a key
<asm/ptrace.h> definition; I think 'struct pt_watch_regs' is a good
candidate. If that test does not succeed, then the configure process
fails gracefully stating the minimum released version of kernel headers
required.
2. Add the same test, except in the failure case fall back to the internal
definitions we already have, wrapped into #ifndef
HAVE_STRUCT_PT_WATCH_REGS.
3. Add the same test and disable hardware watchpoint support in the
failure case.
I prefer #3. If 'struct pt_watch_regs' is not defined, hardware
watchpoint is not supported in the kernel. Because 'struct
pt_watch_regs' was added in this commit in linux kernel,
commit 0926bf953ee79b8f139741b442e5a18520f81705
Author: David Daney <ddaney@avtrex.com>
Date: Tue Sep 23 00:11:26 2008 -0700
MIPS: Ptrace support for HARDWARE_WATCHPOINTS
This is the final part of the watch register patch. Here we hook up
ptrace so that the user space debugger (gdb), can set and read the
registers.
Signed-off-by: David Daney <ddaney@avtrex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
--
Yao (éå)