1229997Sken/* Target-dependent code for GNU/Linux on Xtensa processors. 2229997Sken 3229997Sken Copyright (C) 2007-2020 Free Software Foundation, Inc. 4229997Sken 5229997Sken This file is part of GDB. 6229997Sken 7229997Sken This program is free software; you can redistribute it and/or modify 8229997Sken it under the terms of the GNU General Public License as published by 9229997Sken the Free Software Foundation; either version 3 of the License, or 10229997Sken (at your option) any later version. 11229997Sken 12229997Sken This program is distributed in the hope that it will be useful, 13229997Sken but WITHOUT ANY WARRANTY; without even the implied warranty of 14229997Sken MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15229997Sken GNU General Public License for more details. 16229997Sken 17229997Sken You should have received a copy of the GNU General Public License 18229997Sken along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19229997Sken 20229997Sken#include "defs.h" 21229997Sken#include "xtensa-tdep.h" 22229997Sken#include "osabi.h" 23229997Sken#include "linux-tdep.h" 24229997Sken#include "solib-svr4.h" 25229997Sken#include "symtab.h" 26229997Sken#include "gdbarch.h" 27229997Sken 28229997Sken/* This enum represents the signals' numbers on the Xtensa 29229997Sken architecture. It just contains the signal definitions which are 30229997Sken different from the generic implementation. 31229997Sken 32229997Sken It is derived from the file <arch/xtensa/include/uapi/asm/signal.h>, 33229997Sken from the Linux kernel tree. */ 34229997Sken 35229997Skenenum 36229997Sken { 37229997Sken XTENSA_LINUX_SIGRTMIN = 32, 38229997Sken XTENSA_LINUX_SIGRTMAX = 63, 39229997Sken }; 40229997Sken 41229997Sken/* Implementation of `gdbarch_gdb_signal_from_target', as defined in 42229997Sken gdbarch.h. */ 43229997Sken 44229997Skenstatic enum gdb_signal 45229997Skenxtensa_linux_gdb_signal_from_target (struct gdbarch *gdbarch, 46229997Sken int signal) 47229997Sken{ 48229997Sken if (signal >= XTENSA_LINUX_SIGRTMIN && signal <= XTENSA_LINUX_SIGRTMAX) 49229997Sken { 50229997Sken int offset = signal - XTENSA_LINUX_SIGRTMIN; 51229997Sken 52229997Sken 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 67static int 68xtensa_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 99static void 100xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 101{ 102 struct gdbarch_tdep *tdep = 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); 114 115 set_solib_svr4_fetch_link_map_offsets 116 (gdbarch, svr4_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 128void _initialize_xtensa_linux_tdep (); 129void 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