gdb/gdbserver/linux-sh-low.c

   1 /* GNU/Linux/SH specific low level interface, for the remote server for GDB.
   2    Copyright (C) 1995-2014 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 /* Defined in auto-generated file reg-sh.c.  */
  23 void init_registers_sh (void);
  24 extern const struct target_desc *tdesc_sh;
  25
  26 #ifdef HAVE_SYS_REG_H
  27 #include <sys/reg.h>
  28 #endif
  29
  30 #include <asm/ptrace.h>
  31
  32 #define sh_num_regs 41
  33
  34 /* Currently, don't check/send MQ.  */
  35 static int sh_regmap[] = {
  36  0,     4,      8,      12,     16,     20,     24,     28,
  37  32,    36,     40,     44,     48,     52,     56,     60,
  38
  39  REG_PC*4,   REG_PR*4,   REG_GBR*4,  -1,
  40  REG_MACH*4, REG_MACL*4, REG_SR*4,
  41  REG_FPUL*4, REG_FPSCR*4,
  42
  43  REG_FPREG0*4+0,   REG_FPREG0*4+4,   REG_FPREG0*4+8,   REG_FPREG0*4+12,
  44  REG_FPREG0*4+16,  REG_FPREG0*4+20,  REG_FPREG0*4+24,  REG_FPREG0*4+28,
  45  REG_FPREG0*4+32,  REG_FPREG0*4+36,  REG_FPREG0*4+40,  REG_FPREG0*4+44,
  46  REG_FPREG0*4+48,  REG_FPREG0*4+52,  REG_FPREG0*4+56,  REG_FPREG0*4+60,
  47 };
  48
  49 static int
  50 sh_cannot_store_register (int regno)
  51 {
  52   return 0;
  53 }
  54
  55 static int
  56 sh_cannot_fetch_register (int regno)
  57 {
  58   return 0;
  59 }
  60
  61 static CORE_ADDR
  62 sh_get_pc (struct regcache *regcache)
  63 {
  64   unsigned long pc;
  65   collect_register_by_name (regcache, "pc", &pc);
  66   return pc;
  67 }
  68
  69 static void
  70 sh_set_pc (struct regcache *regcache, CORE_ADDR pc)
  71 {
  72   unsigned long newpc = pc;
  73   supply_register_by_name (regcache, "pc", &newpc);
  74 }
  75
  76 /* Correct in either endianness, obviously.  */
  77 static const unsigned short sh_breakpoint = 0xc3c3;
  78 #define sh_breakpoint_len 2
  79
  80 static int
  81 sh_breakpoint_at (CORE_ADDR where)
  82 {
  83   unsigned short insn;
  84
  85   (*the_target->read_memory) (where, (unsigned char *) &insn, 2);
  86   if (insn == sh_breakpoint)
  87     return 1;
  88
  89   /* If necessary, recognize more trap instructions here.  GDB only uses the
  90      one.  */
  91   return 0;
  92 }
  93
  94 /* Provide only a fill function for the general register set.  ps_lgetregs
  95    will use this for NPTL support.  */
  96
  97 static void sh_fill_gregset (struct regcache *regcache, void *buf)
  98 {
  99   int i;
 100
 101   for (i = 0; i < 23; i++)
 102     if (sh_regmap[i] != -1)
 103       collect_register (regcache, i, (char *) buf + sh_regmap[i]);
 104 }
 105
 106 static struct regset_info sh_regsets[] = {
 107   { 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
 108   { 0, 0, 0, -1, -1, NULL, NULL }
 109 };
 110
 111 static struct regsets_info sh_regsets_info =
 112   {
 113     sh_regsets, /* regsets */
 114     0, /* num_regsets */
 115     NULL, /* disabled_regsets */
 116   };
 117
 118 static struct usrregs_info sh_usrregs_info =
 119   {
 120     sh_num_regs,
 121     sh_regmap,
 122   };
 123
 124 static struct regs_info regs_info =
 125   {
 126     NULL, /* regset_bitmap */
 127     &sh_usrregs_info,
 128     &sh_regsets_info
 129   };
 130
 131 static const struct regs_info *
 132 sh_regs_info (void)
 133 {
 134   return &regs_info;
 135 }
 136
 137 static void
 138 sh_arch_setup (void)
 139 {
 140   current_process ()->tdesc = tdesc_sh;
 141 }
 142
 143 struct linux_target_ops the_low_target = {
 144   sh_arch_setup,
 145   sh_regs_info,
 146   sh_cannot_fetch_register,
 147   sh_cannot_store_register,
 148   NULL, /* fetch_register */
 149   sh_get_pc,
 150   sh_set_pc,
 151   (const unsigned char *) &sh_breakpoint,
 152   sh_breakpoint_len,
 153   NULL,
 154   0,
 155   sh_breakpoint_at,
 156 };
 157
 158 void
 159 initialize_low_arch (void)
 160 {
 161   init_registers_sh ();
 162
 163   initialize_regsets_info (&sh_regsets_info);
 164 }