gdb/xtensa-linux-tdep.c

   1 /* Target-dependent code for GNU/Linux on Xtensa processors.
   2
   3    Copyright (C) 2007-2024 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 "xtensa-tdep.h"
  21 #include "osabi.h"
  22 #include "linux-tdep.h"
  23 #include "solib-svr4.h"
  24 #include "symtab.h"
  25 #include "gdbarch.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   xtensa_gdbarch_tdep *tdep = gdbarch_tdep<xtensa_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, 0);
 113
 114   set_solib_svr4_fetch_link_map_offsets
 115     (gdbarch, linux_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 _initialize_xtensa_linux_tdep ();
 128 void
 129 _initialize_xtensa_linux_tdep ()
 130 {
 131   gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX,
 132                           xtensa_linux_init_abi);
 133 }