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   const regs_info *get_regs_info () override;
  29
  30   const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
  31
  32 protected:
  33
  34   void low_arch_setup () override;
  35
  36   bool low_cannot_fetch_register (int regno) override;
  37
  38   bool low_cannot_store_register (int regno) override;
  39
  40   bool low_supports_breakpoints () override;
  41
  42   CORE_ADDR low_get_pc (regcache *regcache) override;
  43
  44   void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
  45 };
  46
  47 /* The singleton target ops object.  */
  48
  49 static sh_target the_sh_target;
  50
  51 bool
  52 sh_target::low_supports_breakpoints ()
  53 {
  54   return true;
  55 }
  56
  57 CORE_ADDR
  58 sh_target::low_get_pc (regcache *regcache)
  59 {
  60   return linux_get_pc_32bit (regcache);
  61 }
  62
  63 void
  64 sh_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
  65 {
  66   linux_set_pc_32bit (regcache, pc);
  67 }
  68
  69 /* Defined in auto-generated file reg-sh.c.  */
  70 void init_registers_sh (void);
  71 extern const struct target_desc *tdesc_sh;
  72
  73 #ifdef HAVE_SYS_REG_H
  74 #include <sys/reg.h>
  75 #endif
  76
  77 #include <asm/ptrace.h>
  78
  79 #define sh_num_regs 41
  80
  81 /* Currently, don't check/send MQ.  */
  82 static int sh_regmap[] = {
  83  0,     4,      8,      12,     16,     20,     24,     28,
  84  32,    36,     40,     44,     48,     52,     56,     60,
  85
  86  REG_PC*4,   REG_PR*4,   REG_GBR*4,  -1,
  87  REG_MACH*4, REG_MACL*4, REG_SR*4,
  88  REG_FPUL*4, REG_FPSCR*4,
  89
  90  REG_FPREG0*4+0,   REG_FPREG0*4+4,   REG_FPREG0*4+8,   REG_FPREG0*4+12,
  91  REG_FPREG0*4+16,  REG_FPREG0*4+20,  REG_FPREG0*4+24,  REG_FPREG0*4+28,
  92  REG_FPREG0*4+32,  REG_FPREG0*4+36,  REG_FPREG0*4+40,  REG_FPREG0*4+44,
  93  REG_FPREG0*4+48,  REG_FPREG0*4+52,  REG_FPREG0*4+56,  REG_FPREG0*4+60,
  94 };
  95
  96 bool
  97 sh_target::low_cannot_store_register (int regno)
  98 {
  99   return false;
 100 }
 101
 102 bool
 103 sh_target::low_cannot_fetch_register (int regno)
 104 {
 105   return false;
 106 }
 107
 108 /* Correct in either endianness, obviously.  */
 109 static const unsigned short sh_breakpoint = 0xc3c3;
 110 #define sh_breakpoint_len 2
 111
 112 /* Implementation of target ops method "sw_breakpoint_from_kind".  */
 113
 114 const gdb_byte *
 115 sh_target::sw_breakpoint_from_kind (int kind, int *size)
 116 {
 117   *size = sh_breakpoint_len;
 118   return (const gdb_byte *) &sh_breakpoint;
 119 }
 120
 121 static int
 122 sh_breakpoint_at (CORE_ADDR where)
 123 {
 124   unsigned short insn;
 125
 126   the_target->read_memory (where, (unsigned char *) &insn, 2);
 127   if (insn == sh_breakpoint)
 128     return 1;
 129
 130   /* If necessary, recognize more trap instructions here.  GDB only uses the
 131      one.  */
 132   return 0;
 133 }
 134
 135 /* Support for hardware single step.  */
 136
 137 static int
 138 sh_supports_hardware_single_step (void)
 139 {
 140   return 1;
 141 }
 142
 143 /* Provide only a fill function for the general register set.  ps_lgetregs
 144    will use this for NPTL support.  */
 145
 146 static void sh_fill_gregset (struct regcache *regcache, void *buf)
 147 {
 148   int i;
 149
 150   for (i = 0; i < 23; i++)
 151     if (sh_regmap[i] != -1)
 152       collect_register (regcache, i, (char *) buf + sh_regmap[i]);
 153 }
 154
 155 static struct regset_info sh_regsets[] = {
 156   { 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
 157   NULL_REGSET
 158 };
 159
 160 static struct regsets_info sh_regsets_info =
 161   {
 162     sh_regsets, /* regsets */
 163     0, /* num_regsets */
 164     NULL, /* disabled_regsets */
 165   };
 166
 167 static struct usrregs_info sh_usrregs_info =
 168   {
 169     sh_num_regs,
 170     sh_regmap,
 171   };
 172
 173 static struct regs_info myregs_info =
 174   {
 175     NULL, /* regset_bitmap */
 176     &sh_usrregs_info,
 177     &sh_regsets_info
 178   };
 179
 180 const regs_info *
 181 sh_target::get_regs_info ()
 182 {
 183   return &myregs_info;
 184 }
 185
 186 void
 187 sh_target::low_arch_setup ()
 188 {
 189   current_process ()->tdesc = tdesc_sh;
 190 }
 191
 192 struct linux_target_ops the_low_target = {
 193   0,
 194   sh_breakpoint_at,
 195   NULL, /* supports_z_point_type */
 196   NULL, /* insert_point */
 197   NULL, /* remove_point */
 198   NULL, /* stopped_by_watchpoint */
 199   NULL, /* stopped_data_address */
 200   NULL, /* collect_ptrace_register */
 201   NULL, /* supply_ptrace_register */
 202   NULL, /* siginfo_fixup */
 203   NULL, /* new_process */
 204   NULL, /* delete_process */
 205   NULL, /* new_thread */
 206   NULL, /* delete_thread */
 207   NULL, /* new_fork */
 208   NULL, /* prepare_to_resume */
 209   NULL, /* process_qsupported */
 210   NULL, /* supports_tracepoints */
 211   NULL, /* get_thread_area */
 212   NULL, /* install_fast_tracepoint_jump_pad */
 213   NULL, /* emit_ops */
 214   NULL, /* get_min_fast_tracepoint_insn_len */
 215   NULL, /* supports_range_stepping */
 216   sh_supports_hardware_single_step,
 217 };
 218
 219 /* The linux target ops object.  */
 220
 221 linux_process_target *the_linux_target = &the_sh_target;
 222
 223 void
 224 initialize_low_arch (void)
 225 {
 226   init_registers_sh ();
 227
 228   initialize_regsets_info (&sh_regsets_info);
 229 }