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/* Copyright (C) 2021-2024 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 "gcore-elf.h"
#include "elf-bfd.h"
#include "target.h"
#include "regcache.h"
#include "gdbarch.h"
#include "gdbthread.h"
#include "inferior.h"
#include "regset.h"
#include "gdbsupport/tdesc.h"
/* Structure for passing information from GCORE_COLLECT_THREAD_REGISTERS
via an iterator to GCORE_COLLECT_REGSET_SECTION_CB. */
struct gcore_elf_collect_regset_section_cb_data
{
gcore_elf_collect_regset_section_cb_data
(struct gdbarch *gdbarch, const struct regcache *regcache,
bfd *obfd, ptid_t ptid, gdb_signal stop_signal,
gdb::unique_xmalloc_ptr<char> *note_data, int *note_size)
: gdbarch (gdbarch), regcache (regcache), obfd (obfd),
note_data (note_data), note_size (note_size),
stop_signal (stop_signal)
{
/* The LWP is often not available for bare metal target, in which case
use the tid instead. */
if (ptid.lwp_p ())
lwp = ptid.lwp ();
else
lwp = ptid.tid ();
}
struct gdbarch *gdbarch;
const struct regcache *regcache;
bfd *obfd;
gdb::unique_xmalloc_ptr<char> *note_data;
int *note_size;
unsigned long lwp;
enum gdb_signal stop_signal;
bool abort_iteration = false;
};
/* Callback for ITERATE_OVER_REGSET_SECTIONS that records a single
regset in the core file note section. */
static void
gcore_elf_collect_regset_section_cb (const char *sect_name,
int supply_size, int collect_size,
const struct regset *regset,
const char *human_name, void *cb_data)
{
struct gcore_elf_collect_regset_section_cb_data *data
= (struct gcore_elf_collect_regset_section_cb_data *) cb_data;
bool variable_size_section = (regset != nullptr
&& regset->flags & REGSET_VARIABLE_SIZE);
gdb_assert (variable_size_section || supply_size == collect_size);
if (data->abort_iteration)
return;
gdb_assert (regset != nullptr && regset->collect_regset != nullptr);
/* This is intentionally zero-initialized by using std::vector, so
that any padding bytes in the core file will show as 0. */
std::vector<gdb_byte> buf (collect_size);
regset->collect_regset (regset, data->regcache, -1, buf.data (),
collect_size);
/* PRSTATUS still needs to be treated specially. */
if (strcmp (sect_name, ".reg") == 0)
data->note_data->reset (elfcore_write_prstatus
(data->obfd, data->note_data->release (),
data->note_size, data->lwp,
gdb_signal_to_host (data->stop_signal),
buf.data ()));
else
data->note_data->reset (elfcore_write_register_note
(data->obfd, data->note_data->release (),
data->note_size, sect_name, buf.data (),
collect_size));
if (*data->note_data == nullptr)
data->abort_iteration = true;
}
/* Records the register state of thread PTID out of REGCACHE into the note
buffer represented by *NOTE_DATA and NOTE_SIZE. OBFD is the bfd into
which the core file is being created, and STOP_SIGNAL is the signal that
cause thread PTID to stop. */
static void
gcore_elf_collect_thread_registers
(const struct regcache *regcache, ptid_t ptid, bfd *obfd,
gdb::unique_xmalloc_ptr<char> *note_data, int *note_size,
enum gdb_signal stop_signal)
{
struct gdbarch *gdbarch = regcache->arch ();
gcore_elf_collect_regset_section_cb_data data (gdbarch, regcache, obfd,
ptid, stop_signal,
note_data, note_size);
gdbarch_iterate_over_regset_sections
(gdbarch, gcore_elf_collect_regset_section_cb, &data, regcache);
}
/* See gcore-elf.h. */
void
gcore_elf_build_thread_register_notes
(struct gdbarch *gdbarch, struct thread_info *info, gdb_signal stop_signal,
bfd *obfd, gdb::unique_xmalloc_ptr<char> *note_data, int *note_size)
{
regcache *regcache
= get_thread_arch_regcache (info->inf, info->ptid, gdbarch);
target_fetch_registers (regcache, -1);
gcore_elf_collect_thread_registers (regcache, info->ptid, obfd,
note_data, note_size, stop_signal);
}
/* See gcore-elf.h. */
void
gcore_elf_make_tdesc_note (struct gdbarch *gdbarch, bfd *obfd,
gdb::unique_xmalloc_ptr<char> *note_data,
int *note_size)
{
/* Append the target description to the core file. */
const struct target_desc *tdesc = gdbarch_target_desc (gdbarch);
const char *tdesc_xml
= tdesc == nullptr ? nullptr : tdesc_get_features_xml (tdesc);
if (tdesc_xml != nullptr && *tdesc_xml != '\0')
{
/* Skip the leading '@'. */
if (*tdesc_xml == '@')
++tdesc_xml;
/* Include the null terminator in the length. */
size_t tdesc_len = strlen (tdesc_xml) + 1;
/* Now add the target description into the core file. */
note_data->reset (elfcore_write_register_note (obfd,
note_data->release (),
note_size,
".gdb-tdesc", tdesc_xml,
tdesc_len));
}
}
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