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/* Common code for targets with the none ABI (bare-metal), but where the
BFD library is build with ELF support.
Copyright (C) 2020-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "elf-none-tdep.h"
#include "exceptions.h"
#include "regset.h"
#include "elf-bfd.h"
#include "inferior.h"
#include "regcache.h"
#include "gdbarch.h"
#include "gcore.h"
#include "gcore-elf.h"
/* Build the note section for a corefile, and return it in a malloc
buffer. Currently this just dumps all available registers for each
thread. */
static gdb::unique_xmalloc_ptr<char>
elf_none_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd,
int *note_size)
{
gdb::unique_xmalloc_ptr<char> note_data;
/* Add note information about the executable and its arguments. */
std::string fname;
std::string psargs;
static const size_t fname_len = 16;
static const size_t psargs_len = 80;
if (get_exec_file (0))
{
const char *exe = get_exec_file (0);
fname = lbasename (exe);
psargs = std::string (exe);
const std::string &infargs = current_inferior ()->args ();
if (!infargs.empty ())
psargs += ' ' + infargs;
/* All existing targets that handle writing out prpsinfo expect the
fname and psargs strings to be at least 16 and 80 characters long
respectively, including a null terminator at the end. Resize to
the expected length minus one to ensure there is a null within the
required length. */
fname.resize (fname_len - 1);
psargs.resize (psargs_len - 1);
}
/* Resize the buffers up to their required lengths. This will fill any
remaining space with the null character. */
fname.resize (fname_len);
psargs.resize (psargs_len);
/* Now write out the prpsinfo structure. */
note_data.reset (elfcore_write_prpsinfo (obfd, note_data.release (),
note_size, fname.c_str (),
psargs.c_str ()));
if (note_data == nullptr)
return nullptr;
/* Thread register information. */
try
{
update_thread_list ();
}
catch (const gdb_exception_error &e)
{
exception_print (gdb_stderr, e);
}
/* Like the Linux kernel, prefer dumping the signalled thread first.
"First thread" is what tools use to infer the signalled thread. */
thread_info *signalled_thr = gcore_find_signalled_thread ();
/* All threads are reported as having been stopped by the same signal
that stopped SIGNALLED_THR. */
gdb_signal stop_signal;
if (signalled_thr != nullptr)
stop_signal = signalled_thr->stop_signal ();
else
stop_signal = GDB_SIGNAL_0;
if (signalled_thr != nullptr)
gcore_elf_build_thread_register_notes (gdbarch, signalled_thr,
stop_signal, obfd, ¬e_data,
note_size);
for (thread_info *thr : current_inferior ()->non_exited_threads ())
{
if (thr == signalled_thr)
continue;
gcore_elf_build_thread_register_notes (gdbarch, thr, stop_signal, obfd,
¬e_data, note_size);
}
/* Include the target description when possible. Some architectures
allow for per-thread gdbarch so we should really be emitting a tdesc
per-thread, however, we don't currently support reading in a
per-thread tdesc, so just emit the tdesc for the signalled thread. */
gdbarch = target_thread_architecture (signalled_thr->ptid);
gcore_elf_make_tdesc_note (gdbarch, obfd, ¬e_data, note_size);
return note_data;
}
/* See none-tdep.h. */
void
elf_none_init_abi (struct gdbarch *gdbarch)
{
/* Default core file support. */
set_gdbarch_make_corefile_notes (gdbarch, elf_none_make_corefile_notes);
}
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