37d9e06231
xtensa GDB may be used with both bare-metal and linux-based applications. In case of bare-metal application gdbserver is able to provide information about all CPU registers: both unprivileged and privileged. In case of linux-based application only a small subset of privileged state is available. Currently xtensa GDB only expects unprivileged registers in 'g' packets and it fails to communicate with server that sends both privileged and unprivileged registers. Allow bare-metal xtensa GDB to deal with both privileged and unprivileged registers by initializing tdep->num_regs with the total number of target CPU registers. Keep linux-based xtensa GDB functionality as is by copying tdep->num_nopriv_regs to tdep->num_regs. gdb/ 2018-05-09 Max Filippov <jcmvbkbc@gmail.com> * xtensa-linux-tdep.c (xtensa-tdep.h): New include. (xtensa_linux_init_abi): Limit tdep->num_regs by tdep->num_nopriv_regs. * xtensa-tdep.c (xtensa_derive_tdep): Calculate tdep->num_nopriv_regs and only copy it to tdep->num_regs if it's not initialized.
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/* Target-dependent code for GNU/Linux on Xtensa processors.
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Copyright (C) 2007-2018 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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/* 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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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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if (tdep->num_nopriv_regs < tdep->num_regs)
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tdep->num_regs = tdep->num_nopriv_regs;
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linux_init_abi (info, gdbarch);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_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
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_initialize_xtensa_linux_tdep (void)
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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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