1 /* Target-dependent code for GNU/Linux on Xtensa processors. 2 3 Copyright (C) 2007-2019 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 27 /* This enum represents the signals' numbers on the Xtensa 28 architecture. It just contains the signal definitions which are 29 different from the generic implementation. 30 31 It is derived from the file <arch/xtensa/include/uapi/asm/signal.h>, 32 from the Linux kernel tree. */ 33 34 enum 35 { 36 XTENSA_LINUX_SIGRTMIN = 32, 37 XTENSA_LINUX_SIGRTMAX = 63, 38 }; 39 40 /* Implementation of `gdbarch_gdb_signal_from_target', as defined in 41 gdbarch.h. */ 42 43 static enum gdb_signal 44 xtensa_linux_gdb_signal_from_target (struct gdbarch *gdbarch, 45 int signal) 46 { 47 if (signal >= XTENSA_LINUX_SIGRTMIN && signal <= XTENSA_LINUX_SIGRTMAX) 48 { 49 int offset = signal - XTENSA_LINUX_SIGRTMIN; 50 51 if (offset == 0) 52 return GDB_SIGNAL_REALTIME_32; 53 else 54 return (enum gdb_signal) (offset - 1 55 + (int) GDB_SIGNAL_REALTIME_33); 56 } 57 else if (signal > XTENSA_LINUX_SIGRTMAX) 58 return GDB_SIGNAL_UNKNOWN; 59 60 return linux_gdb_signal_from_target (gdbarch, signal); 61 } 62 63 /* Implementation of `gdbarch_gdb_signal_to_target', as defined in 64 gdbarch.h. */ 65 66 static int 67 xtensa_linux_gdb_signal_to_target (struct gdbarch *gdbarch, 68 enum gdb_signal signal) 69 { 70 switch (signal) 71 { 72 /* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>, 73 therefore we have to handle it here. */ 74 case GDB_SIGNAL_REALTIME_32: 75 return XTENSA_LINUX_SIGRTMIN; 76 77 /* GDB_SIGNAL_REALTIME_64 is not valid on Xtensa. */ 78 case GDB_SIGNAL_REALTIME_64: 79 return -1; 80 } 81 82 /* GDB_SIGNAL_REALTIME_33 to _63 are continuous. 83 84 Xtensa does not have _64. */ 85 if (signal >= GDB_SIGNAL_REALTIME_33 86 && signal <= GDB_SIGNAL_REALTIME_63) 87 { 88 int offset = signal - GDB_SIGNAL_REALTIME_33; 89 90 return XTENSA_LINUX_SIGRTMIN + 1 + offset; 91 } 92 93 return linux_gdb_signal_to_target (gdbarch, signal); 94 } 95 96 /* OS specific initialization of gdbarch. */ 97 98 static void 99 xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 100 { 101 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 102 103 if (tdep->num_nopriv_regs < tdep->num_regs) 104 { 105 tdep->num_pseudo_regs += tdep->num_regs - tdep->num_nopriv_regs; 106 tdep->num_regs = tdep->num_nopriv_regs; 107 108 set_gdbarch_num_regs (gdbarch, tdep->num_regs); 109 set_gdbarch_num_pseudo_regs (gdbarch, tdep->num_pseudo_regs); 110 } 111 112 linux_init_abi (info, gdbarch); 113 114 set_solib_svr4_fetch_link_map_offsets 115 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 116 117 set_gdbarch_gdb_signal_from_target (gdbarch, 118 xtensa_linux_gdb_signal_from_target); 119 set_gdbarch_gdb_signal_to_target (gdbarch, 120 xtensa_linux_gdb_signal_to_target); 121 122 /* Enable TLS support. */ 123 set_gdbarch_fetch_tls_load_module_address (gdbarch, 124 svr4_fetch_objfile_link_map); 125 } 126 127 void 128 _initialize_xtensa_linux_tdep (void) 129 { 130 gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX, 131 xtensa_linux_init_abi); 132 } 133