1 /* Target-dependent code for GNU/Linux on Xtensa processors. 2 3 Copyright (C) 2007-2023 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #include "defs.h" 21 #include "xtensa-tdep.h" 22 #include "osabi.h" 23 #include "linux-tdep.h" 24 #include "solib-svr4.h" 25 #include "symtab.h" 26 #include "gdbarch.h" 27 28 /* This enum represents the signals' numbers on the Xtensa 29 architecture. It just contains the signal definitions which are 30 different from the generic implementation. 31 32 It is derived from the file <arch/xtensa/include/uapi/asm/signal.h>, 33 from the Linux kernel tree. */ 34 35 enum 36 { 37 XTENSA_LINUX_SIGRTMIN = 32, 38 XTENSA_LINUX_SIGRTMAX = 63, 39 }; 40 41 /* Implementation of `gdbarch_gdb_signal_from_target', as defined in 42 gdbarch.h. */ 43 44 static enum gdb_signal 45 xtensa_linux_gdb_signal_from_target (struct gdbarch *gdbarch, 46 int signal) 47 { 48 if (signal >= XTENSA_LINUX_SIGRTMIN && signal <= XTENSA_LINUX_SIGRTMAX) 49 { 50 int offset = signal - XTENSA_LINUX_SIGRTMIN; 51 52 if (offset == 0) 53 return GDB_SIGNAL_REALTIME_32; 54 else 55 return (enum gdb_signal) (offset - 1 56 + (int) GDB_SIGNAL_REALTIME_33); 57 } 58 else if (signal > XTENSA_LINUX_SIGRTMAX) 59 return GDB_SIGNAL_UNKNOWN; 60 61 return linux_gdb_signal_from_target (gdbarch, signal); 62 } 63 64 /* Implementation of `gdbarch_gdb_signal_to_target', as defined in 65 gdbarch.h. */ 66 67 static int 68 xtensa_linux_gdb_signal_to_target (struct gdbarch *gdbarch, 69 enum gdb_signal signal) 70 { 71 switch (signal) 72 { 73 /* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>, 74 therefore we have to handle it here. */ 75 case GDB_SIGNAL_REALTIME_32: 76 return XTENSA_LINUX_SIGRTMIN; 77 78 /* GDB_SIGNAL_REALTIME_64 is not valid on Xtensa. */ 79 case GDB_SIGNAL_REALTIME_64: 80 return -1; 81 } 82 83 /* GDB_SIGNAL_REALTIME_33 to _63 are continuous. 84 85 Xtensa does not have _64. */ 86 if (signal >= GDB_SIGNAL_REALTIME_33 87 && signal <= GDB_SIGNAL_REALTIME_63) 88 { 89 int offset = signal - GDB_SIGNAL_REALTIME_33; 90 91 return XTENSA_LINUX_SIGRTMIN + 1 + offset; 92 } 93 94 return linux_gdb_signal_to_target (gdbarch, signal); 95 } 96 97 /* OS specific initialization of gdbarch. */ 98 99 static void 100 xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 101 { 102 xtensa_gdbarch_tdep *tdep = gdbarch_tdep<xtensa_gdbarch_tdep> (gdbarch); 103 104 if (tdep->num_nopriv_regs < tdep->num_regs) 105 { 106 tdep->num_pseudo_regs += tdep->num_regs - tdep->num_nopriv_regs; 107 tdep->num_regs = tdep->num_nopriv_regs; 108 109 set_gdbarch_num_regs (gdbarch, tdep->num_regs); 110 set_gdbarch_num_pseudo_regs (gdbarch, tdep->num_pseudo_regs); 111 } 112 113 linux_init_abi (info, gdbarch, 0); 114 115 set_solib_svr4_fetch_link_map_offsets 116 (gdbarch, linux_ilp32_fetch_link_map_offsets); 117 118 set_gdbarch_gdb_signal_from_target (gdbarch, 119 xtensa_linux_gdb_signal_from_target); 120 set_gdbarch_gdb_signal_to_target (gdbarch, 121 xtensa_linux_gdb_signal_to_target); 122 123 /* Enable TLS support. */ 124 set_gdbarch_fetch_tls_load_module_address (gdbarch, 125 svr4_fetch_objfile_link_map); 126 } 127 128 void _initialize_xtensa_linux_tdep (); 129 void 130 _initialize_xtensa_linux_tdep () 131 { 132 gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX, 133 xtensa_linux_init_abi); 134 } 135