gdbserver/linux-sh-low.cc

   1 /* GNU/Linux/SH specific low level interface, for the remote server for GDB.
   2    Copyright (C) 1995-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "server.h"
  20 #include "linux-low.h"
  21
  22 /* Linux target op definitions for the SH architecture.  */
  23
  24 class sh_target : public linux_process_target
  25 {
  26 public:
  27
  28 };
  29
  30 /* The singleton target ops object.  */
  31
  32 static sh_target the_sh_target;
  33
  34 /* Defined in auto-generated file reg-sh.c.  */
  35 void init_registers_sh (void);
  36 extern const struct target_desc *tdesc_sh;
  37
  38 #ifdef HAVE_SYS_REG_H
  39 #include <sys/reg.h>
  40 #endif
  41
  42 #include <asm/ptrace.h>
  43
  44 #define sh_num_regs 41
  45
  46 /* Currently, don't check/send MQ.  */
  47 static int sh_regmap[] = {
  48  0,     4,      8,      12,     16,     20,     24,     28,
  49  32,    36,     40,     44,     48,     52,     56,     60,
  50
  51  REG_PC*4,   REG_PR*4,   REG_GBR*4,  -1,
  52  REG_MACH*4, REG_MACL*4, REG_SR*4,
  53  REG_FPUL*4, REG_FPSCR*4,
  54
  55  REG_FPREG0*4+0,   REG_FPREG0*4+4,   REG_FPREG0*4+8,   REG_FPREG0*4+12,
  56  REG_FPREG0*4+16,  REG_FPREG0*4+20,  REG_FPREG0*4+24,  REG_FPREG0*4+28,
  57  REG_FPREG0*4+32,  REG_FPREG0*4+36,  REG_FPREG0*4+40,  REG_FPREG0*4+44,
  58  REG_FPREG0*4+48,  REG_FPREG0*4+52,  REG_FPREG0*4+56,  REG_FPREG0*4+60,
  59 };
  60
  61 static int
  62 sh_cannot_store_register (int regno)
  63 {
  64   return 0;
  65 }
  66
  67 static int
  68 sh_cannot_fetch_register (int regno)
  69 {
  70   return 0;
  71 }
  72
  73 /* Correct in either endianness, obviously.  */
  74 static const unsigned short sh_breakpoint = 0xc3c3;
  75 #define sh_breakpoint_len 2
  76
  77 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  78
  79 static const gdb_byte *
  80 sh_sw_breakpoint_from_kind (int kind, int *size)
  81 {
  82   *size = sh_breakpoint_len;
  83   return (const gdb_byte *) &sh_breakpoint;
  84 }
  85
  86 static int
  87 sh_breakpoint_at (CORE_ADDR where)
  88 {
  89   unsigned short insn;
  90
  91   the_target->read_memory (where, (unsigned char *) &insn, 2);
  92   if (insn == sh_breakpoint)
  93     return 1;
  94
  95   /* If necessary, recognize more trap instructions here.  GDB only uses the
  96      one.  */
  97   return 0;
  98 }
  99
 100 /* Support for hardware single step.  */
 101
 102 static int
 103 sh_supports_hardware_single_step (void)
 104 {
 105   return 1;
 106 }
 107
 108 /* Provide only a fill function for the general register set.  ps_lgetregs
 109    will use this for NPTL support.  */
 110
 111 static void sh_fill_gregset (struct regcache *regcache, void *buf)
 112 {
 113   int i;
 114
 115   for (i = 0; i < 23; i++)
 116     if (sh_regmap[i] != -1)
 117       collect_register (regcache, i, (char *) buf + sh_regmap[i]);
 118 }
 119
 120 static struct regset_info sh_regsets[] = {
 121   { 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
 122   NULL_REGSET
 123 };
 124
 125 static struct regsets_info sh_regsets_info =
 126   {
 127     sh_regsets, /* regsets */
 128     0, /* num_regsets */
 129     NULL, /* disabled_regsets */
 130   };
 131
 132 static struct usrregs_info sh_usrregs_info =
 133   {
 134     sh_num_regs,
 135     sh_regmap,
 136   };
 137
 138 static struct regs_info regs_info =
 139   {
 140     NULL, /* regset_bitmap */
 141     &sh_usrregs_info,
 142     &sh_regsets_info
 143   };
 144
 145 static const struct regs_info *
 146 sh_regs_info (void)
 147 {
 148   return &regs_info;
 149 }
 150
 151 static void
 152 sh_arch_setup (void)
 153 {
 154   current_process ()->tdesc = tdesc_sh;
 155 }
 156
 157 struct linux_target_ops the_low_target = {
 158   sh_arch_setup,
 159   sh_regs_info,
 160   sh_cannot_fetch_register,
 161   sh_cannot_store_register,
 162   NULL, /* fetch_register */
 163   linux_get_pc_32bit,
 164   linux_set_pc_32bit,
 165   NULL, /* breakpoint_kind_from_pc */
 166   sh_sw_breakpoint_from_kind,
 167   NULL,
 168   0,
 169   sh_breakpoint_at,
 170   NULL, /* supports_z_point_type */
 171   NULL, /* insert_point */
 172   NULL, /* remove_point */
 173   NULL, /* stopped_by_watchpoint */
 174   NULL, /* stopped_data_address */
 175   NULL, /* collect_ptrace_register */
 176   NULL, /* supply_ptrace_register */
 177   NULL, /* siginfo_fixup */
 178   NULL, /* new_process */
 179   NULL, /* delete_process */
 180   NULL, /* new_thread */
 181   NULL, /* delete_thread */
 182   NULL, /* new_fork */
 183   NULL, /* prepare_to_resume */
 184   NULL, /* process_qsupported */
 185   NULL, /* supports_tracepoints */
 186   NULL, /* get_thread_area */
 187   NULL, /* install_fast_tracepoint_jump_pad */
 188   NULL, /* emit_ops */
 189   NULL, /* get_min_fast_tracepoint_insn_len */
 190   NULL, /* supports_range_stepping */
 191   NULL, /* breakpoint_kind_from_current_state */
 192   sh_supports_hardware_single_step,
 193 };
 194
 195 /* The linux target ops object.  */
 196
 197 linux_process_target *the_linux_target = &the_sh_target;
 198
 199 void
 200 initialize_low_arch (void)
 201 {
 202   init_registers_sh ();
 203
 204   initialize_regsets_info (&sh_regsets_info);
 205 }