gdb/shnbsd-tdep.c

   1 /* Target-dependent code for NetBSD/sh.
   2
   3    Copyright (C) 2002, 2003, 2006, 2007 Free Software Foundation, Inc.
   4
   5    Contributed by Wasabi Systems, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #include "defs.h"
  25 #include "gdbcore.h"
  26 #include "regcache.h"
  27 #include "regset.h"
  28 #include "value.h"
  29 #include "osabi.h"
  30
  31 #include "gdb_assert.h"
  32 #include "gdb_string.h"
  33
  34 #include "sh-tdep.h"
  35 #include "shnbsd-tdep.h"
  36 #include "solib-svr4.h"
  37
  38 /* Convert an r0-r15 register number into an offset into a ptrace
  39    register structure.  */
  40 static const int regmap[] =
  41 {
  42   (20 * 4),     /* r0 */
  43   (19 * 4),     /* r1 */
  44   (18 * 4),     /* r2 */
  45   (17 * 4),     /* r3 */
  46   (16 * 4),     /* r4 */
  47   (15 * 4),     /* r5 */
  48   (14 * 4),     /* r6 */
  49   (13 * 4),     /* r7 */
  50   (12 * 4),     /* r8 */
  51   (11 * 4),     /* r9 */
  52   (10 * 4),     /* r10 */
  53   ( 9 * 4),     /* r11 */
  54   ( 8 * 4),     /* r12 */
  55   ( 7 * 4),     /* r13 */
  56   ( 6 * 4),     /* r14 */
  57   ( 5 * 4),     /* r15 */
  58 };
  59
  60 /* Sizeof `struct reg' in <machine/reg.h>.  */
  61 #define SHNBSD_SIZEOF_GREGS     (21 * 4)
  62
  63 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  64    in the general-purpose register set REGSET to register cache
  65    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  66
  67 static void
  68 shnbsd_supply_gregset (const struct regset *regset,
  69                        struct regcache *regcache,
  70                        int regnum, const void *gregs, size_t len)
  71 {
  72   const gdb_byte *regs = gregs;
  73   int i;
  74
  75   gdb_assert (len >= SHNBSD_SIZEOF_GREGS);
  76
  77   if (regnum == PC_REGNUM || regnum == -1)
  78     regcache_raw_supply (regcache, PC_REGNUM, regs + (0 * 4));
  79
  80   if (regnum == SR_REGNUM || regnum == -1)
  81     regcache_raw_supply (regcache, SR_REGNUM, regs + (1 * 4));
  82
  83   if (regnum == PR_REGNUM || regnum == -1)
  84     regcache_raw_supply (regcache, PR_REGNUM, regs + (2 * 4));
  85
  86   if (regnum == MACH_REGNUM || regnum == -1)
  87     regcache_raw_supply (regcache, MACH_REGNUM, regs + (3 * 4));
  88
  89   if (regnum == MACL_REGNUM || regnum == -1)
  90     regcache_raw_supply (regcache, MACL_REGNUM, regs + (4 * 4));
  91
  92   for (i = R0_REGNUM; i <= (R0_REGNUM + 15); i++)
  93     {
  94       if (regnum == i || regnum == -1)
  95         regcache_raw_supply (regcache, i, regs + regmap[i - R0_REGNUM]);
  96     }
  97 }
  98
  99 /* Collect register REGNUM in the general-purpose register set
 100    REGSET. from register cache REGCACHE into the buffer specified by
 101    GREGS and LEN.  If REGNUM is -1, do this for all registers in
 102    REGSET.  */
 103
 104 static void
 105 shnbsd_collect_gregset (const struct regset *regset,
 106                         const struct regcache *regcache,
 107                         int regnum, void *gregs, size_t len)
 108 {
 109   gdb_byte *regs = gregs;
 110   int i;
 111
 112   gdb_assert (len >= SHNBSD_SIZEOF_GREGS);
 113
 114   if (regnum == PC_REGNUM || regnum == -1)
 115     regcache_raw_collect (regcache, PC_REGNUM, regs + (0 * 4));
 116
 117   if (regnum == SR_REGNUM || regnum == -1)
 118     regcache_raw_collect (regcache, SR_REGNUM, regs + (1 * 4));
 119
 120   if (regnum == PR_REGNUM || regnum == -1)
 121     regcache_raw_collect (regcache, PR_REGNUM, regs + (2 * 4));
 122
 123   if (regnum == MACH_REGNUM || regnum == -1)
 124     regcache_raw_collect (regcache, MACH_REGNUM, regs + (3 * 4));
 125
 126   if (regnum == MACL_REGNUM || regnum == -1)
 127     regcache_raw_collect (regcache, MACL_REGNUM, regs + (4 * 4));
 128
 129   for (i = R0_REGNUM; i <= (R0_REGNUM + 15); i++)
 130     {
 131       if (regnum == i || regnum == -1)
 132         regcache_raw_collect (regcache, i, regs + regmap[i - R0_REGNUM]);
 133     }
 134 }
 135
 136 /* SH register sets.  */
 137
 138 static struct regset shnbsd_gregset =
 139 {
 140   NULL,
 141   shnbsd_supply_gregset,
 142   shnbsd_collect_gregset
 143 };
 144
 145 /* Return the appropriate register set for the core section identified
 146    by SECT_NAME and SECT_SIZE.  */
 147
 148 const struct regset *
 149 shnbsd_regset_from_core_section (struct gdbarch *gdbarch,
 150                                  const char *sect_name, size_t sect_size)
 151 {
 152   if (strcmp (sect_name, ".reg") == 0 && sect_size >= SHNBSD_SIZEOF_GREGS)
 153     return &shnbsd_gregset;
 154
 155   return NULL;
 156 }
 157
 158 void
 159 shnbsd_supply_reg (char *regs, int regnum)
 160 {
 161   shnbsd_supply_gregset (&shnbsd_gregset, current_regcache, regnum,
 162                          regs, SHNBSD_SIZEOF_GREGS);
 163 }
 164
 165 void
 166 shnbsd_fill_reg (char *regs, int regnum)
 167 {
 168   shnbsd_collect_gregset (&shnbsd_gregset, current_regcache, regnum,
 169                           regs, SHNBSD_SIZEOF_GREGS);
 170 }
 171 \f
 172
 173 static void
 174 shnbsd_init_abi (struct gdbarch_info info,
 175                   struct gdbarch *gdbarch)
 176 {
 177   set_gdbarch_regset_from_core_section
 178     (gdbarch, shnbsd_regset_from_core_section);
 179
 180   set_solib_svr4_fetch_link_map_offsets
 181     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 182 }
 183 \f
 184
 185 /* OpenBSD uses uses the traditional NetBSD core file format, even for
 186    ports that use ELF.  */
 187 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
 188
 189 static enum gdb_osabi
 190 shnbsd_core_osabi_sniffer (bfd *abfd)
 191 {
 192   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
 193     return GDB_OSABI_NETBSD_CORE;
 194
 195   return GDB_OSABI_UNKNOWN;
 196 }
 197
 198 void
 199 _initialize_shnbsd_tdep (void)
 200 {
 201   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
 202   gdbarch_register_osabi_sniffer (bfd_arch_sh, bfd_target_unknown_flavour,
 203                                   shnbsd_core_osabi_sniffer);
 204
 205   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_NETBSD_ELF,
 206                           shnbsd_init_abi);
 207   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_OPENBSD_ELF,
 208                           shnbsd_init_abi);
 209 }