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345bd07cce
I would like to be able to use non-trivial types in gdbarch_tdep types. This is not possible at the moment (in theory), because of the one definition rule. To allow it, rename all gdbarch_tdep types to <arch>_gdbarch_tdep, and make them inherit from a gdbarch_tdep base class. The inheritance is necessary to be able to pass pointers to all these <arch>_gdbarch_tdep objects to gdbarch_alloc, which takes a pointer to gdbarch_tdep. These objects are never deleted through a base class pointer, so I didn't include a virtual destructor. In the future, if gdbarch objects deletable, I could imagine that the gdbarch_tdep objects could become owned by the gdbarch objects, and then it would become useful to have a virtual destructor (so that the gdbarch object can delete the owned gdbarch_tdep object). But that's not necessary right now. It turns out that RISC-V already has a gdbarch_tdep that is non-default-constructible, so that provides a good motivation for this change. Most changes are fairly straightforward, mostly needing to add some casts all over the place. There is however the xtensa architecture, doing its own little weird thing to define its gdbarch_tdep. I did my best to adapt it, but I can't test those changes. Change-Id: Ic001903f91ddd106bd6ca09a79dabe8df2d69f3b
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/* Target-dependent code for GNU/Linux on Xtensa processors.
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Copyright (C) 2007-2021 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "xtensa-tdep.h"
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#include "osabi.h"
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#include "linux-tdep.h"
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#include "solib-svr4.h"
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#include "symtab.h"
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#include "gdbarch.h"
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/* This enum represents the signals' numbers on the Xtensa
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architecture. It just contains the signal definitions which are
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different from the generic implementation.
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It is derived from the file <arch/xtensa/include/uapi/asm/signal.h>,
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from the Linux kernel tree. */
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enum
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{
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XTENSA_LINUX_SIGRTMIN = 32,
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XTENSA_LINUX_SIGRTMAX = 63,
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};
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/* Implementation of `gdbarch_gdb_signal_from_target', as defined in
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gdbarch.h. */
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static enum gdb_signal
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xtensa_linux_gdb_signal_from_target (struct gdbarch *gdbarch,
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int signal)
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{
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if (signal >= XTENSA_LINUX_SIGRTMIN && signal <= XTENSA_LINUX_SIGRTMAX)
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{
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int offset = signal - XTENSA_LINUX_SIGRTMIN;
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if (offset == 0)
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return GDB_SIGNAL_REALTIME_32;
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else
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return (enum gdb_signal) (offset - 1
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+ (int) GDB_SIGNAL_REALTIME_33);
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}
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else if (signal > XTENSA_LINUX_SIGRTMAX)
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return GDB_SIGNAL_UNKNOWN;
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return linux_gdb_signal_from_target (gdbarch, signal);
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}
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/* Implementation of `gdbarch_gdb_signal_to_target', as defined in
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gdbarch.h. */
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static int
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xtensa_linux_gdb_signal_to_target (struct gdbarch *gdbarch,
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enum gdb_signal signal)
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{
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switch (signal)
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{
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/* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>,
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therefore we have to handle it here. */
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case GDB_SIGNAL_REALTIME_32:
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return XTENSA_LINUX_SIGRTMIN;
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/* GDB_SIGNAL_REALTIME_64 is not valid on Xtensa. */
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case GDB_SIGNAL_REALTIME_64:
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return -1;
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}
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/* GDB_SIGNAL_REALTIME_33 to _63 are continuous.
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Xtensa does not have _64. */
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if (signal >= GDB_SIGNAL_REALTIME_33
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&& signal <= GDB_SIGNAL_REALTIME_63)
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{
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int offset = signal - GDB_SIGNAL_REALTIME_33;
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return XTENSA_LINUX_SIGRTMIN + 1 + offset;
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}
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return linux_gdb_signal_to_target (gdbarch, signal);
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}
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/* OS specific initialization of gdbarch. */
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static void
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xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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xtensa_gdbarch_tdep *tdep = (xtensa_gdbarch_tdep *) gdbarch_tdep (gdbarch);
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if (tdep->num_nopriv_regs < tdep->num_regs)
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{
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tdep->num_pseudo_regs += tdep->num_regs - tdep->num_nopriv_regs;
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tdep->num_regs = tdep->num_nopriv_regs;
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set_gdbarch_num_regs (gdbarch, tdep->num_regs);
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set_gdbarch_num_pseudo_regs (gdbarch, tdep->num_pseudo_regs);
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}
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linux_init_abi (info, gdbarch, 0);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, linux_ilp32_fetch_link_map_offsets);
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set_gdbarch_gdb_signal_from_target (gdbarch,
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xtensa_linux_gdb_signal_from_target);
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set_gdbarch_gdb_signal_to_target (gdbarch,
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xtensa_linux_gdb_signal_to_target);
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/* Enable TLS support. */
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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}
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void _initialize_xtensa_linux_tdep ();
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void
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_initialize_xtensa_linux_tdep ()
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{
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gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX,
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xtensa_linux_init_abi);
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}
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