gdb/shnbsd-tdep.c

   1 /* Target-dependent code for SuperH running NetBSD, for GDB.
   2    Copyright 2002 Free Software Foundation, Inc.
   3    Contributed by Wasabi Systems, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "regcache.h"
  25 #include "value.h"
  26 #include "solib-svr4.h"
  27
  28 #include "shnbsd-tdep.h"
  29
  30 /* Convert an r0-r15 register number into an offset into a ptrace
  31    register structure.  */
  32 static const int regmap[] =
  33 {
  34   (20 * 4),     /* r0 */
  35   (19 * 4),     /* r1 */
  36   (18 * 4),     /* r2 */
  37   (17 * 4),     /* r3 */
  38   (16 * 4),     /* r4 */
  39   (15 * 4),     /* r5 */
  40   (14 * 4),     /* r6 */
  41   (13 * 4),     /* r7 */
  42   (12 * 4),     /* r8 */
  43   (11 * 4),     /* r9 */
  44   (10 * 4),     /* r10 */
  45   ( 9 * 4),     /* r11 */
  46   ( 8 * 4),     /* r12 */
  47   ( 7 * 4),     /* r13 */
  48   ( 6 * 4),     /* r14 */
  49   ( 5 * 4),     /* r15 */
  50 };
  51
  52 #define SIZEOF_STRUCT_REG (21 * 4)
  53
  54 void
  55 shnbsd_supply_reg (char *regs, int regno)
  56 {
  57   int i;
  58
  59   if (regno == PC_REGNUM || regno == -1)
  60     supply_register (PC_REGNUM, regs + (0 * 4));
  61
  62   if (regno == SR_REGNUM || regno == -1)
  63     supply_register (SR_REGNUM, regs + (1 * 4));
  64
  65   if (regno == PR_REGNUM || regno == -1)
  66     supply_register (PR_REGNUM, regs + (2 * 4));
  67
  68   if (regno == MACH_REGNUM || regno == -1)
  69     supply_register (MACH_REGNUM, regs + (3 * 4));
  70
  71   if (regno == MACL_REGNUM || regno == -1)
  72     supply_register (MACL_REGNUM, regs + (4 * 4));
  73
  74   if ((regno >= R0_REGNUM && regno <= (R0_REGNUM + 15)) || regno == -1)
  75     {
  76       for (i = R0_REGNUM; i <= (R0_REGNUM + 15); i++)
  77         if (regno == i || regno == -1)
  78           supply_register (i, regs + regmap[i - R0_REGNUM]);
  79     }
  80 }
  81
  82 void
  83 shnbsd_fill_reg (char *regs, int regno)
  84 {
  85   int i;
  86
  87   if (regno == PC_REGNUM || regno == -1)
  88     regcache_collect (PC_REGNUM, regs + (0 * 4));
  89
  90   if (regno == SR_REGNUM || regno == -1)
  91     regcache_collect (SR_REGNUM, regs + (1 * 4));
  92
  93   if (regno == PR_REGNUM || regno == -1)
  94     regcache_collect (PR_REGNUM, regs + (2 * 4));
  95
  96   if (regno == MACH_REGNUM || regno == -1)
  97     regcache_collect (MACH_REGNUM, regs + (3 * 4));
  98
  99   if (regno == MACL_REGNUM || regno == -1)
 100     regcache_collect (MACL_REGNUM, regs + (4 * 4));
 101
 102   if ((regno >= R0_REGNUM && regno <= (R0_REGNUM + 15)) || regno == -1)
 103     {
 104       for (i = R0_REGNUM; i <= (R0_REGNUM + 15); i++)
 105         if (regno == i || regno == -1)
 106           regcache_collect (i, regs + regmap[i - R0_REGNUM]);
 107     }
 108 }
 109
 110 /* Fetch (and possibly build) an appropriate link_map_offsets
 111    structure for NetBSD/sh targets using the struct offsets
 112    defined in <link.h> (but without actual reference to that file).
 113
 114    This makes it possible to access NetBSD/sh shared libraries
 115    from a GDB that was not built on a NetBSD/sh host (for cross
 116    debugging).  */
 117
 118 static struct link_map_offsets *
 119 shnbsd_solib_svr4_fetch_link_map_offsets (void)
 120 {
 121   static struct link_map_offsets lmo;
 122   static struct link_map_offsets *lmp = NULL;
 123
 124   if (lmp == NULL)
 125     {
 126       lmp = &lmo;
 127
 128       lmo.r_debug_size = 16;
 129
 130       lmo.r_map_offset = 4;
 131       lmo.r_map_size   = 4;
 132
 133       lmo.link_map_size = 20;
 134
 135       lmo.l_addr_offset = 0;
 136       lmo.l_addr_size   = 4;
 137
 138       lmo.l_name_offset = 4;
 139       lmo.l_name_size   = 4;
 140
 141       lmo.l_next_offset = 12;
 142       lmo.l_next_size   = 4;
 143
 144       lmo.l_prev_offset = 16;
 145       lmo.l_prev_size   = 4;
 146     }
 147
 148   return lmp;
 149 }
 150
 151 static void
 152 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
 153                       int which, CORE_ADDR ignore)
 154 {
 155   /* We get everything from the .reg section.  */
 156   if (which != 0)
 157     return;
 158
 159   if (core_reg_size < SIZEOF_STRUCT_REG)
 160     {
 161       warning ("Wrong size register set in core file.");
 162       return;
 163     }
 164
 165   /* Integer registers.  */
 166   shnbsd_supply_reg (core_reg_sect, -1);
 167 }
 168
 169 static void
 170 fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size,
 171                          int which, CORE_ADDR ignore)
 172 {
 173   switch (which)
 174     {
 175     case 0:  /* Integer registers.  */
 176       if (core_reg_size != SIZEOF_STRUCT_REG)
 177         warning ("Wrong size register set in core file.");
 178       else
 179         shnbsd_supply_reg (core_reg_sect, -1);
 180       break;
 181
 182     default:
 183       /* Don't know what kind of register request this is; just ignore it.  */
 184       break;
 185     }
 186 }
 187
 188 static struct core_fns shnbsd_core_fns =
 189 {
 190   bfd_target_unknown_flavour,           /* core_flavour */
 191   default_check_format,                 /* check_format */
 192   default_core_sniffer,                 /* core_sniffer */
 193   fetch_core_registers,                 /* core_read_registers */
 194   NULL                                  /* next */
 195 };
 196
 197 static struct core_fns shnbsd_elfcore_fns =
 198 {
 199   bfd_target_elf_flavour,               /* core_flavour */
 200   default_check_format,                 /* check_format */
 201   default_core_sniffer,                 /* core_sniffer */
 202   fetch_elfcore_registers,              /* core_read_registers */
 203   NULL                                  /* next */
 204 };
 205
 206 static void
 207 shnbsd_init_abi (struct gdbarch_info info,
 208                   struct gdbarch *gdbarch)
 209 {
 210   set_solib_svr4_fetch_link_map_offsets (gdbarch,
 211                                    shnbsd_solib_svr4_fetch_link_map_offsets);
 212 }
 213
 214 void
 215 _initialize_shnbsd_tdep (void)
 216 {
 217   add_core_fns (&shnbsd_core_fns);
 218   add_core_fns (&shnbsd_elfcore_fns);
 219
 220   sh_gdbarch_register_os_abi (SH_OSABI_NETBSD_ELF, shnbsd_init_abi);
 221 }