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* gdbint.texinfo (Adding support for debugging core files): New node.

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(Native Debugging): Remove the ``Native core file Support'' section.
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Joel Brobecker 2009-05-07 18:40:44 +00:00
parent ad16af38c6
commit b39f498814
2 changed files with 17 additions and 58 deletions
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5
gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2009-05-07 Joel Brobecker <brobecker@adacore.com>
* gdbint.texinfo (Adding support for debugging core files): New node.
(Native Debugging): Remove the ``Native core file Support'' section.
2009-05-01 Eli Zaretskii <eliz@gnu.org>
* gdb.texinfo (Process Record and Replay): Improve and clarify.

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gdb/doc/gdbint.texinfo
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@ -2831,6 +2831,7 @@ using the Bourne shell script @file{gdbarch.sh}.
* Register Representation::
* Frame Interpretation::
* Inferior Call Setup::
* Adding support for debugging core files::
* Defining Other Architecture Features::
* Adding a New Target::
@end menu
@ -4420,6 +4421,17 @@ Some Harvard architectures may not allow this.
@end deftypefn
@node Adding support for debugging core files
@section Adding support for debugging core files
@cindex core files
The prerequisite for adding core file support in @value{GDBN} is to have
core file support in BFD.
Once BFD support is available, writing the apropriate
@code{regset_from_core_section} architecture function should be all
that is needed in order to add support for core files in @value{GDBN}.
@node Defining Other Architecture Features
@section Defining Other Architecture Features
@ -5408,64 +5420,6 @@ This is the low level interface to inferior processes for systems using
the Unix @code{ptrace} call in a vanilla way.
@end table
@section Native core file Support
@cindex native core files
@table @file
@findex fetch_core_registers
@item core-aout.c::fetch_core_registers()
Support for reading registers out of a core file. This routine calls
@code{register_addr()}, see below. Now that BFD is used to read core
files, virtually all machines should use @code{core-aout.c}, and should
just provide @code{fetch_core_registers} in @code{@var{xyz}-nat.c} (or
@code{REGISTER_U_ADDR} in @code{nm-@var{xyz}.h}).
@item core-aout.c::register_addr()
If your @code{nm-@var{xyz}.h} file defines the macro
@code{REGISTER_U_ADDR(addr, blockend, regno)}, it should be defined to
set @code{addr} to the offset within the @samp{user} struct of @value{GDBN}
register number @code{regno}. @code{blockend} is the offset within the
``upage'' of @code{u.u_ar0}. If @code{REGISTER_U_ADDR} is defined,
@file{core-aout.c} will define the @code{register_addr()} function and
use the macro in it. If you do not define @code{REGISTER_U_ADDR}, but
you are using the standard @code{fetch_core_registers()}, you will need
to define your own version of @code{register_addr()}, put it into your
@code{@var{xyz}-nat.c} file, and be sure @code{@var{xyz}-nat.o} is in
the @code{NATDEPFILES} list. If you have your own
@code{fetch_core_registers()}, you may not need a separate
@code{register_addr()}. Many custom @code{fetch_core_registers()}
implementations simply locate the registers themselves.@refill
@end table
When making @value{GDBN} run native on a new operating system, to make it
possible to debug core files, you will need to either write specific
code for parsing your OS's core files, or customize
@file{bfd/trad-core.c}. First, use whatever @code{#include} files your
machine uses to define the struct of registers that is accessible
(possibly in the u-area) in a core file (rather than
@file{machine/reg.h}), and an include file that defines whatever header
exists on a core file (e.g., the u-area or a @code{struct core}). Then
modify @code{trad_unix_core_file_p} to use these values to set up the
section information for the data segment, stack segment, any other
segments in the core file (perhaps shared library contents or control
information), ``registers'' segment, and if there are two discontiguous
sets of registers (e.g., integer and float), the ``reg2'' segment. This
section information basically delimits areas in the core file in a
standard way, which the section-reading routines in BFD know how to seek
around in.
Then back in @value{GDBN}, you need a matching routine called
@code{fetch_core_registers}. If you can use the generic one, it's in
@file{core-aout.c}; if not, it's in your @file{@var{xyz}-nat.c} file.
It will be passed a char pointer to the entire ``registers'' segment,
its length, and a zero; or a char pointer to the entire ``regs2''
segment, its length, and a 2. The routine should suck out the supplied
register values and install them into @value{GDBN}'s ``registers'' array.
If your system uses @file{/proc} to control processes, and uses ELF
format core files, then you may be able to use the same routines for
reading the registers out of processes and out of core files.
@section ptrace
@section /proc