gdb/ppcobsd-tdep.c

   1 /* Target-dependent code for OpenBSD/powerpc.
   2
   3    Copyright 2004 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 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 "arch-utils.h"
  24 #include "osabi.h"
  25 #include "regcache.h"
  26 #include "regset.h"
  27
  28 #include "gdb_string.h"
  29
  30 #include "ppc-tdep.h"
  31 #include "ppcobsd-tdep.h"
  32 #include "solib-svr4.h"
  33
  34 /* Register offsets from <machine/reg.h>.  */
  35 struct ppc_reg_offsets ppcobsd_reg_offsets;
  36 \f
  37
  38 /* Core file support.  */
  39
  40 /* Supply register REGNUM in the general-purpose register set REGSET
  41    from the buffer specified by GREGS and LEN to register cache
  42    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  43
  44 void
  45 ppcobsd_supply_gregset (const struct regset *regset,
  46                         struct regcache *regcache, int regnum,
  47                         const void *gregs, size_t len)
  48 {
  49   ppc_supply_gregset (regset, regcache, regnum, gregs, len);
  50   ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
  51 }
  52
  53 /* Collect register REGNUM in the general-purpose register set
  54    REGSET. from register cache REGCACHE into the buffer specified by
  55    GREGS and LEN.  If REGNUM is -1, do this for all registers in
  56    REGSET.  */
  57
  58 void
  59 ppcobsd_collect_gregset (const struct regset *regset,
  60                          const struct regcache *regcache, int regnum,
  61                          void *gregs, size_t len)
  62 {
  63   ppc_collect_gregset (regset, regcache, regnum, gregs, len);
  64   ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
  65 }
  66
  67 /* OpenBS/powerpc register set.  */
  68
  69 struct regset ppcobsd_gregset =
  70 {
  71   &ppcobsd_reg_offsets,
  72   ppcobsd_supply_gregset
  73 };
  74
  75 /* Return the appropriate register set for the core section identified
  76    by SECT_NAME and SECT_SIZE.  */
  77
  78 static const struct regset *
  79 ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
  80                                   const char *sect_name, size_t sect_size)
  81 {
  82   if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
  83     return &ppcobsd_gregset;
  84
  85   return NULL;
  86 }
  87 \f
  88
  89 static void
  90 ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  91 {
  92   /* OpenBSD uses SVR4-style shared libraries.  */
  93   set_gdbarch_in_solib_call_trampoline
  94     (gdbarch, generic_in_solib_call_trampoline);
  95   set_solib_svr4_fetch_link_map_offsets
  96     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  97
  98   set_gdbarch_regset_from_core_section
  99     (gdbarch, ppcobsd_regset_from_core_section);
 100 }
 101 \f
 102
 103 /* OpenBSD uses uses the traditional NetBSD core file format, even for
 104    ports that use ELF.  */
 105 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
 106
 107 static enum gdb_osabi
 108 ppcobsd_core_osabi_sniffer (bfd *abfd)
 109 {
 110   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
 111     return GDB_OSABI_NETBSD_CORE;
 112
 113   return GDB_OSABI_UNKNOWN;
 114 }
 115 \f
 116
 117 /* Provide a prototype to silence -Wmissing-prototypes.  */
 118 void _initialize_ppcobsd_tdep (void);
 119
 120 void
 121 _initialize_ppcobsd_tdep (void)
 122 {
 123   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
 124   gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
 125                                   ppcobsd_core_osabi_sniffer);
 126
 127   gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
 128                           ppcobsd_init_abi);
 129
 130   /* Avoid initializing the register offsets again if they were
 131      already initailized by ppcobsd-nat.c.  */
 132   if (ppcobsd_reg_offsets.pc_offset == 0)
 133     {
 134       /* General-purpose registers.  */
 135       ppcobsd_reg_offsets.r0_offset = 0;
 136       ppcobsd_reg_offsets.pc_offset = 384;
 137       ppcobsd_reg_offsets.ps_offset = 388;
 138       ppcobsd_reg_offsets.cr_offset = 392;
 139       ppcobsd_reg_offsets.lr_offset = 396;
 140       ppcobsd_reg_offsets.ctr_offset = 400;
 141       ppcobsd_reg_offsets.xer_offset = 404;
 142       ppcobsd_reg_offsets.mq_offset = 408;
 143
 144       /* Floating-point registers.  */
 145       ppcobsd_reg_offsets.f0_offset = 128;
 146       ppcobsd_reg_offsets.fpscr_offset = -1;
 147
 148       /* AltiVec registers.  */
 149       ppcobsd_reg_offsets.vr0_offset = 0;
 150       ppcobsd_reg_offsets.vscr_offset = 512;
 151       ppcobsd_reg_offsets.vrsave_offset = 520;
 152     }
 153 }