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Re: [rfc] bi-arch for x86-64 corefile.
- From: Pedro Alves <palves at redhat dot com>
- To: Yao Qi <yao at codesourcery dot com>
- Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, binutils at sourceware dot org, "gdb at sourceware dot org" <gdb at sourceware dot org>
- Date: Tue, 30 Oct 2012 12:57:41 +0000
- Subject: Re: [rfc] bi-arch for x86-64 corefile.
- References: <1350881426-4945-1-git-send-email-yao@codesourcery.com> <CAMe9rOpeR8AX6EG8mNcfZNHNMrpZmv1S4O8H7BmREsU1vyN1jQ@mail.gmail.com> <508F3B88.8060701@codesourcery.com> <CAMe9rOrXFG_E7F0hhHjexEhahWWNVwfxfSXoOcCAU9XotSuuVw@mail.gmail.com> <508F578F.8050807@codesourcery.com> <CAMe9rOp_7=S5rTEC+T8Q-UkZj3wDNNM6AhwbRXn18nZAGDH03A@mail.gmail.com> <508FCA04.6010600@codesourcery.com>
On 10/30/2012 12:37 PM, Yao Qi wrote:
> This requires something different in configure options. In my previous patch, when configure i686-pc-linux-gnu-gdb to handle bi-arch, we run configure with '--enable-64-bit-bfd'. In current trunk (w/ your patch), we have to run configure with '--enable-targets=x86_64-pc-linux-gnu'.
>
> Copy gdb@ here to make sure GDB people are aware of this change, otherwise, configuring gdb with '--enable-64-bit-bfd' only still doesn't work for handling x86-64 corefile on x86 gdb.
That sounds like an unnecessary restriction. A 32-bit GDB can debug a 64-bit
inferior with gdbserver just fine (it can also debug a 64-bit core), provided GDB
is built with --enable-64-bit-bfd. Yes, debugging a native 64-bit inferior won't
work due to ptrace limitations, but GDB's gcore command can generate cores
even when remote debugging w/ gdbserver.
We have things like this, gdb/configure.tgt:
i[34567]86-*-linux*)
# Target: Intel 386 running GNU/Linux
gdb_target_obs="i386-tdep.o i386-linux-tdep.o glibc-tdep.o i387-tdep.o \
solib-svr4.o symfile-mem.o \
linux-tdep.o linux-record.o"
if test "x$enable_64_bit_bfd" = "xyes"; then
# Target: GNU/Linux x86-64
gdb_target_obs="amd64-tdep.o amd64-linux-tdep.o ${gdb_target_obs}"
fi
build_gdbserver=yes
;;
So it's be nice if bfd did the same in this case. Thus, I'd very much
prefer if --enable-64-bit-bfd was enough for making bi-arch corefiles
work.
--
Pedro Alves