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 3 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, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "regcache.h"
  25 #include "regset.h"
  26 #include "value.h"
  27 #include "osabi.h"
  28
  29 #include "gdb_assert.h"
  30 #include "gdb_string.h"
  31
  32 #include "sh-tdep.h"
  33 #include "shnbsd-tdep.h"
  34 #include "solib-svr4.h"
  35
  36 /* Convert an r0-r15 register number into an offset into a ptrace
  37    register structure.  */
  38 static const int regmap[] =
  39 {
  40   (20 * 4),     /* r0 */
  41   (19 * 4),     /* r1 */
  42   (18 * 4),     /* r2 */
  43   (17 * 4),     /* r3 */
  44   (16 * 4),     /* r4 */
  45   (15 * 4),     /* r5 */
  46   (14 * 4),     /* r6 */
  47   (13 * 4),     /* r7 */
  48   (12 * 4),     /* r8 */
  49   (11 * 4),     /* r9 */
  50   (10 * 4),     /* r10 */
  51   ( 9 * 4),     /* r11 */
  52   ( 8 * 4),     /* r12 */
  53   ( 7 * 4),     /* r13 */
  54   ( 6 * 4),     /* r14 */
  55   ( 5 * 4),     /* r15 */
  56 };
  57
  58 /* Sizeof `struct reg' in <machine/reg.h>.  */
  59 #define SHNBSD_SIZEOF_GREGS     (21 * 4)
  60
  61 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  62    in the general-purpose register set REGSET to register cache
  63    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  64
  65 static void
  66 shnbsd_supply_gregset (const struct regset *regset,
  67                        struct regcache *regcache,
  68                        int regnum, const void *gregs, size_t len)
  69 {
  70   const gdb_byte *regs = gregs;
  71   int i;
  72
  73   gdb_assert (len >= SHNBSD_SIZEOF_GREGS);
  74
  75   if (regnum == gdbarch_pc_regnum (current_gdbarch) || regnum == -1)
  76     regcache_raw_supply (regcache,
  77                          gdbarch_pc_regnum (current_gdbarch),
  78                          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 == gdbarch_pc_regnum (current_gdbarch) || regnum == -1)
 115     regcache_raw_collect (regcache, gdbarch_pc_regnum (current_gdbarch),
 116                           regs + (0 * 4));
 117
 118   if (regnum == SR_REGNUM || regnum == -1)
 119     regcache_raw_collect (regcache, SR_REGNUM, regs + (1 * 4));
 120
 121   if (regnum == PR_REGNUM || regnum == -1)
 122     regcache_raw_collect (regcache, PR_REGNUM, regs + (2 * 4));
 123
 124   if (regnum == MACH_REGNUM || regnum == -1)
 125     regcache_raw_collect (regcache, MACH_REGNUM, regs + (3 * 4));
 126
 127   if (regnum == MACL_REGNUM || regnum == -1)
 128     regcache_raw_collect (regcache, MACL_REGNUM, regs + (4 * 4));
 129
 130   for (i = R0_REGNUM; i <= (R0_REGNUM + 15); i++)
 131     {
 132       if (regnum == i || regnum == -1)
 133         regcache_raw_collect (regcache, i, regs + regmap[i - R0_REGNUM]);
 134     }
 135 }
 136
 137 /* SH register sets.  */
 138
 139 static struct regset shnbsd_gregset =
 140 {
 141   NULL,
 142   shnbsd_supply_gregset,
 143   shnbsd_collect_gregset
 144 };
 145
 146 /* Return the appropriate register set for the core section identified
 147    by SECT_NAME and SECT_SIZE.  */
 148
 149 const struct regset *
 150 shnbsd_regset_from_core_section (struct gdbarch *gdbarch,
 151                                  const char *sect_name, size_t sect_size)
 152 {
 153   if (strcmp (sect_name, ".reg") == 0 && sect_size >= SHNBSD_SIZEOF_GREGS)
 154     return &shnbsd_gregset;
 155
 156   return NULL;
 157 }
 158
 159 void
 160 shnbsd_supply_reg (struct regcache *regcache, const char *regs, int regnum)
 161 {
 162   shnbsd_supply_gregset (&shnbsd_gregset, regcache, regnum,
 163                          regs, SHNBSD_SIZEOF_GREGS);
 164 }
 165
 166 void
 167 shnbsd_fill_reg (const struct regcache *regcache, char *regs, int regnum)
 168 {
 169   shnbsd_collect_gregset (&shnbsd_gregset, regcache, regnum,
 170                           regs, SHNBSD_SIZEOF_GREGS);
 171 }
 172 \f
 173
 174 static void
 175 shnbsd_init_abi (struct gdbarch_info info,
 176                   struct gdbarch *gdbarch)
 177 {
 178   set_gdbarch_regset_from_core_section
 179     (gdbarch, shnbsd_regset_from_core_section);
 180
 181   set_solib_svr4_fetch_link_map_offsets
 182     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 183 }
 184 \f
 185
 186 /* OpenBSD uses uses the traditional NetBSD core file format, even for
 187    ports that use ELF.  */
 188 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
 189
 190 static enum gdb_osabi
 191 shnbsd_core_osabi_sniffer (bfd *abfd)
 192 {
 193   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
 194     return GDB_OSABI_NETBSD_CORE;
 195
 196   return GDB_OSABI_UNKNOWN;
 197 }
 198
 199 void
 200 _initialize_shnbsd_tdep (void)
 201 {
 202   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
 203   gdbarch_register_osabi_sniffer (bfd_arch_sh, bfd_target_unknown_flavour,
 204                                   shnbsd_core_osabi_sniffer);
 205
 206   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_NETBSD_ELF,
 207                           shnbsd_init_abi);
 208   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_OPENBSD_ELF,
 209                           shnbsd_init_abi);
 210 }