| 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 | #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 | 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 | |
| 128 | void |
| 129 | _initialize_xtensa_linux_tdep (void) |
| 130 | { |
| 131 | gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX, |
| 132 | xtensa_linux_init_abi); |
| 133 | } |