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