gdb/shnbsd-tdep.c

   1 /* Target-dependent code for NetBSD/sh.
   2
   3    Copyright (C) 2002, 2003, 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Wasabi Systems, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26 #include "regset.h"
  27 #include "value.h"
  28 #include "osabi.h"
  29
  30 #include "gdb_assert.h"
  31 #include "gdb_string.h"
  32
  33 #include "sh-tdep.h"
  34 #include "shnbsd-tdep.h"
  35 #include "solib-svr4.h"
  36
  37 /* Convert an r0-r15 register number into an offset into a ptrace
  38    register structure.  */
  39 static const int regmap[] =
  40 {
  41   (20 * 4),     /* r0 */
  42   (19 * 4),     /* r1 */
  43   (18 * 4),     /* r2 */
  44   (17 * 4),     /* r3 */
  45   (16 * 4),     /* r4 */
  46   (15 * 4),     /* r5 */
  47   (14 * 4),     /* r6 */
  48   (13 * 4),     /* r7 */
  49   (12 * 4),     /* r8 */
  50   (11 * 4),     /* r9 */
  51   (10 * 4),     /* r10 */
  52   ( 9 * 4),     /* r11 */
  53   ( 8 * 4),     /* r12 */
  54   ( 7 * 4),     /* r13 */
  55   ( 6 * 4),     /* r14 */
  56   ( 5 * 4),     /* r15 */
  57 };
  58
  59 /* Sizeof `struct reg' in <machine/reg.h>.  */
  60 #define SHNBSD_SIZEOF_GREGS     (21 * 4)
  61
  62 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  63    in the general-purpose register set REGSET to register cache
  64    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  65
  66 static void
  67 shnbsd_supply_gregset (const struct regset *regset,
  68                        struct regcache *regcache,
  69                        int regnum, const void *gregs, size_t len)
  70 {
  71   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  72   const gdb_byte *regs = gregs;
  73   int i;
  74
  75   gdb_assert (len >= SHNBSD_SIZEOF_GREGS);
  76
  77   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
  78     regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch),
  79                          regs + (0 * 4));
  80
  81   if (regnum == SR_REGNUM || regnum == -1)
  82     regcache_raw_supply (regcache, SR_REGNUM, regs + (1 * 4));
  83
  84   if (regnum == PR_REGNUM || regnum == -1)
  85     regcache_raw_supply (regcache, PR_REGNUM, regs + (2 * 4));
  86
  87   if (regnum == MACH_REGNUM || regnum == -1)
  88     regcache_raw_supply (regcache, MACH_REGNUM, regs + (3 * 4));
  89
  90   if (regnum == MACL_REGNUM || regnum == -1)
  91     regcache_raw_supply (regcache, MACL_REGNUM, regs + (4 * 4));
  92
  93   for (i = R0_REGNUM; i <= (R0_REGNUM + 15); i++)
  94     {
  95       if (regnum == i || regnum == -1)
  96         regcache_raw_supply (regcache, i, regs + regmap[i - R0_REGNUM]);
  97     }
  98 }
  99
 100 /* Collect register REGNUM in the general-purpose register set
 101    REGSET. from register cache REGCACHE into the buffer specified by
 102    GREGS and LEN.  If REGNUM is -1, do this for all registers in
 103    REGSET.  */
 104
 105 static void
 106 shnbsd_collect_gregset (const struct regset *regset,
 107                         const struct regcache *regcache,
 108                         int regnum, void *gregs, size_t len)
 109 {
 110   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 111   gdb_byte *regs = gregs;
 112   int i;
 113
 114   gdb_assert (len >= SHNBSD_SIZEOF_GREGS);
 115
 116   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
 117     regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch),
 118                           regs + (0 * 4));
 119
 120   if (regnum == SR_REGNUM || regnum == -1)
 121     regcache_raw_collect (regcache, SR_REGNUM, regs + (1 * 4));
 122
 123   if (regnum == PR_REGNUM || regnum == -1)
 124     regcache_raw_collect (regcache, PR_REGNUM, regs + (2 * 4));
 125
 126   if (regnum == MACH_REGNUM || regnum == -1)
 127     regcache_raw_collect (regcache, MACH_REGNUM, regs + (3 * 4));
 128
 129   if (regnum == MACL_REGNUM || regnum == -1)
 130     regcache_raw_collect (regcache, MACL_REGNUM, regs + (4 * 4));
 131
 132   for (i = R0_REGNUM; i <= (R0_REGNUM + 15); i++)
 133     {
 134       if (regnum == i || regnum == -1)
 135         regcache_raw_collect (regcache, i, regs + regmap[i - R0_REGNUM]);
 136     }
 137 }
 138
 139 /* SH register sets.  */
 140
 141 static struct regset shnbsd_gregset =
 142 {
 143   NULL,
 144   shnbsd_supply_gregset,
 145   shnbsd_collect_gregset
 146 };
 147
 148 /* Return the appropriate register set for the core section identified
 149    by SECT_NAME and SECT_SIZE.  */
 150
 151 static const struct regset *
 152 shnbsd_regset_from_core_section (struct gdbarch *gdbarch,
 153                                  const char *sect_name, size_t sect_size)
 154 {
 155   if (strcmp (sect_name, ".reg") == 0 && sect_size >= SHNBSD_SIZEOF_GREGS)
 156     return &shnbsd_gregset;
 157
 158   return NULL;
 159 }
 160
 161 void
 162 shnbsd_supply_reg (struct regcache *regcache, const char *regs, int regnum)
 163 {
 164   shnbsd_supply_gregset (&shnbsd_gregset, regcache, regnum,
 165                          regs, SHNBSD_SIZEOF_GREGS);
 166 }
 167
 168 void
 169 shnbsd_fill_reg (const struct regcache *regcache, char *regs, int regnum)
 170 {
 171   shnbsd_collect_gregset (&shnbsd_gregset, regcache, regnum,
 172                           regs, SHNBSD_SIZEOF_GREGS);
 173 }
 174 \f
 175
 176 static void
 177 shnbsd_init_abi (struct gdbarch_info info,
 178                   struct gdbarch *gdbarch)
 179 {
 180   set_gdbarch_regset_from_core_section
 181     (gdbarch, shnbsd_regset_from_core_section);
 182
 183   set_solib_svr4_fetch_link_map_offsets
 184     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 185 }
 186 \f
 187
 188 /* OpenBSD uses uses the traditional NetBSD core file format, even for
 189    ports that use ELF.  */
 190 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
 191
 192 static enum gdb_osabi
 193 shnbsd_core_osabi_sniffer (bfd *abfd)
 194 {
 195   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
 196     return GDB_OSABI_NETBSD_CORE;
 197
 198   return GDB_OSABI_UNKNOWN;
 199 }
 200
 201 /* Provide a prototype to silence -Wmissing-prototypes.  */
 202 extern initialize_file_ftype _initialize_shnbsd_tdep;
 203
 204 void
 205 _initialize_shnbsd_tdep (void)
 206 {
 207   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
 208   gdbarch_register_osabi_sniffer (bfd_arch_sh, bfd_target_unknown_flavour,
 209                                   shnbsd_core_osabi_sniffer);
 210
 211   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_NETBSD_ELF,
 212                           shnbsd_init_abi);
 213   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_OPENBSD_ELF,
 214                           shnbsd_init_abi);
 215 }