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