| /* Target-dependent code for GNU/Linux on Xtensa processors. |
| |
| Copyright (C) 2007-2021 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, 0); |
| |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, linux_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 |
| _initialize_xtensa_linux_tdep () |
| { |
| gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX, |
| xtensa_linux_init_abi); |
| } |