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/* Target-dependent code for GNU/Linux on Xtensa processors.
Copyright (C) 2007-2020 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 "defs.h"
#include "xtensa-tdep.h"
#include "osabi.h"
#include "linux-tdep.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "gdbarch.h"
/* This enum represents the signals' numbers on the Xtensa
architecture. It just contains the signal definitions which are
different from the generic implementation.
It is derived from the file <arch/xtensa/include/uapi/asm/signal.h>,
from the Linux kernel tree. */
enum
{
XTENSA_LINUX_SIGRTMIN = 32,
XTENSA_LINUX_SIGRTMAX = 63,
};
/* Implementation of `gdbarch_gdb_signal_from_target', as defined in
gdbarch.h. */
static enum gdb_signal
xtensa_linux_gdb_signal_from_target (struct gdbarch *gdbarch,
int signal)
{
if (signal >= XTENSA_LINUX_SIGRTMIN && signal <= XTENSA_LINUX_SIGRTMAX)
{
int offset = signal - XTENSA_LINUX_SIGRTMIN;
if (offset == 0)
return GDB_SIGNAL_REALTIME_32;
else
return (enum gdb_signal) (offset - 1
+ (int) GDB_SIGNAL_REALTIME_33);
}
else if (signal > XTENSA_LINUX_SIGRTMAX)
return GDB_SIGNAL_UNKNOWN;
return linux_gdb_signal_from_target (gdbarch, signal);
}
/* Implementation of `gdbarch_gdb_signal_to_target', as defined in
gdbarch.h. */
static int
xtensa_linux_gdb_signal_to_target (struct gdbarch *gdbarch,
enum gdb_signal signal)
{
switch (signal)
{
/* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>,
therefore we have to handle it here. */
case GDB_SIGNAL_REALTIME_32:
return XTENSA_LINUX_SIGRTMIN;
/* GDB_SIGNAL_REALTIME_64 is not valid on Xtensa. */
case GDB_SIGNAL_REALTIME_64:
return -1;
}
/* GDB_SIGNAL_REALTIME_33 to _63 are continuous.
Xtensa does not have _64. */
if (signal >= GDB_SIGNAL_REALTIME_33
&& signal <= GDB_SIGNAL_REALTIME_63)
{
int offset = signal - GDB_SIGNAL_REALTIME_33;
return XTENSA_LINUX_SIGRTMIN + 1 + offset;
}
return linux_gdb_signal_to_target (gdbarch, signal);
}
/* OS specific initialization of gdbarch. */
static void
xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
if (tdep->num_nopriv_regs < tdep->num_regs)
{
tdep->num_pseudo_regs += tdep->num_regs - tdep->num_nopriv_regs;
tdep->num_regs = tdep->num_nopriv_regs;
set_gdbarch_num_regs (gdbarch, tdep->num_regs);
set_gdbarch_num_pseudo_regs (gdbarch, tdep->num_pseudo_regs);
}
linux_init_abi (info, gdbarch);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
set_gdbarch_gdb_signal_from_target (gdbarch,
xtensa_linux_gdb_signal_from_target);
set_gdbarch_gdb_signal_to_target (gdbarch,
xtensa_linux_gdb_signal_to_target);
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
}
void
_initialize_xtensa_linux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX,
xtensa_linux_init_abi);
}
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