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