gdb/hppaobsd-tdep.c

   1 /* Target-dependent code for OpenBSD/hppa
   2
   3    Copyright (C) 2004-2006, 2008-2012 Free Software Foundation, 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "osabi.h"
  22 #include "regcache.h"
  23 #include "regset.h"
  24
  25 #include "gdb_assert.h"
  26 #include "gdb_string.h"
  27
  28 #include "hppa-tdep.h"
  29 #include "hppabsd-tdep.h"
  30
  31 /* Core file support.  */
  32
  33 /* Sizeof `struct reg' in <machine/reg.h>.  */
  34 #define HPPAOBSD_SIZEOF_GREGS   (34 * 4)
  35
  36 /* Sizeof `struct fpreg' in <machine/reg.h>.  */
  37 #define HPPAOBSD_SIZEOF_FPREGS  (32 * 8)
  38
  39 /* Supply register REGNUM from the buffer specified by GREGS and LEN
  40    in the general-purpose register set REGSET to register cache
  41    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  42
  43 static void
  44 hppaobsd_supply_gregset (const struct regset *regset,
  45                          struct regcache *regcache,
  46                          int regnum, const void *gregs, size_t len)
  47 {
  48   const gdb_byte *regs = gregs;
  49   size_t offset;
  50   int i;
  51
  52   gdb_assert (len >= HPPAOBSD_SIZEOF_GREGS);
  53
  54   for (i = HPPA_R1_REGNUM, offset = 4; i <= HPPA_R31_REGNUM; i++, offset += 4)
  55     {
  56       if (regnum == -1 || regnum == i)
  57         regcache_raw_supply (regcache, i, regs + offset);
  58     }
  59
  60   if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
  61     regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);
  62   if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
  63     regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  64   if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
  65     regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  66 }
  67
  68 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
  69    in the floating-point register set REGSET to register cache
  70    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  71
  72 static void
  73 hppaobsd_supply_fpregset (const struct regset *regset,
  74                           struct regcache *regcache,
  75                           int regnum, const void *fpregs, size_t len)
  76 {
  77   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  78   const gdb_byte *regs = fpregs;
  79   int i;
  80
  81   gdb_assert (len >= HPPAOBSD_SIZEOF_FPREGS);
  82
  83   for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i++)
  84     {
  85       if (regnum == i || regnum == -1)
  86         regcache_raw_supply (regcache, i, regs + (i - HPPA_FP0_REGNUM) * 4);
  87     }
  88 }
  89
  90 /* OpenBSD/hppa register sets.  */
  91
  92 static struct regset hppaobsd_gregset =
  93 {
  94   NULL,
  95   hppaobsd_supply_gregset
  96 };
  97
  98 static struct regset hppaobsd_fpregset =
  99 {
 100   NULL,
 101   hppaobsd_supply_fpregset
 102 };
 103
 104 /* Return the appropriate register set for the core section identified
 105    by SECT_NAME and SECT_SIZE.  */
 106
 107 static const struct regset *
 108 hppaobsd_regset_from_core_section (struct gdbarch *gdbarch,
 109                                   const char *sect_name, size_t sect_size)
 110 {
 111   if (strcmp (sect_name, ".reg") == 0 && sect_size >= HPPAOBSD_SIZEOF_GREGS)
 112     return &hppaobsd_gregset;
 113
 114   if (strcmp (sect_name, ".reg2") == 0 && sect_size >= HPPAOBSD_SIZEOF_FPREGS)
 115     return &hppaobsd_fpregset;
 116
 117   return NULL;
 118 }
 119 \f
 120
 121 static void
 122 hppaobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 123 {
 124   /* Obviously OpenBSD is BSD-based.  */
 125   hppabsd_init_abi (info, gdbarch);
 126
 127   /* Core file support.  */
 128   set_gdbarch_regset_from_core_section
 129     (gdbarch, hppaobsd_regset_from_core_section);
 130 }
 131 \f
 132
 133 /* OpenBSD uses uses the traditional NetBSD core file format, even for
 134    ports that use ELF.  */
 135 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
 136
 137 static enum gdb_osabi
 138 hppaobsd_core_osabi_sniffer (bfd *abfd)
 139 {
 140   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
 141     return GDB_OSABI_NETBSD_CORE;
 142
 143   return GDB_OSABI_UNKNOWN;
 144 }
 145 \f
 146
 147 /* Provide a prototype to silence -Wmissing-prototypes.  */
 148 void _initialize_hppabsd_tdep (void);
 149
 150 void
 151 _initialize_hppabsd_tdep (void)
 152 {
 153   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
 154   gdbarch_register_osabi_sniffer (bfd_arch_hppa, bfd_target_unknown_flavour,
 155                                   hppaobsd_core_osabi_sniffer);
 156
 157   gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_OPENBSD_ELF,
 158                           hppaobsd_init_abi);
 159 }