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 #include "gdb_assert.h"
  28
  29 #include "gdb_string.h"
  30
  31 #include "ppc-tdep.h"
  32 #include "ppcobsd-tdep.h"
  33 #include "solib-svr4.h"
  34
  35 /* Register offsets from <machine/reg.h>.  */
  36 struct ppc_reg_offsets ppcobsd_reg_offsets;
  37 \f
  38
  39 /* Core file support.  */
  40
  41 /* Supply register REGNUM in the general-purpose register set REGSET
  42    from the buffer specified by GREGS and LEN to register cache
  43    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  44
  45 void
  46 ppcobsd_supply_gregset (const struct regset *regset,
  47                         struct regcache *regcache, int regnum,
  48                         const void *gregs, size_t len)
  49 {
  50   /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
  51      point registers.  Traditionally, GDB's register set has still
  52      listed the floating point registers for such machines, so this
  53      code is harmless.  However, the new E500 port actually omits the
  54      floating point registers entirely from the register set --- they
  55      don't even have register numbers assigned to them.
  56
  57      It's not clear to me how best to update this code, so this assert
  58      will alert the first person to encounter the OpenBSD/E500
  59      combination to the problem.  */
  60   gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
  61
  62   ppc_supply_gregset (regset, regcache, regnum, gregs, len);
  63   ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
  64 }
  65
  66 /* Collect register REGNUM in the general-purpose register set
  67    REGSET. from register cache REGCACHE into the buffer specified by
  68    GREGS and LEN.  If REGNUM is -1, do this for all registers in
  69    REGSET.  */
  70
  71 void
  72 ppcobsd_collect_gregset (const struct regset *regset,
  73                          const struct regcache *regcache, int regnum,
  74                          void *gregs, size_t len)
  75 {
  76   /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
  77      point registers.  Traditionally, GDB's register set has still
  78      listed the floating point registers for such machines, so this
  79      code is harmless.  However, the new E500 port actually omits the
  80      floating point registers entirely from the register set --- they
  81      don't even have register numbers assigned to them.
  82
  83      It's not clear to me how best to update this code, so this assert
  84      will alert the first person to encounter the OpenBSD/E500
  85      combination to the problem.  */
  86   gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
  87
  88   ppc_collect_gregset (regset, regcache, regnum, gregs, len);
  89   ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
  90 }
  91
  92 /* OpenBS/powerpc register set.  */
  93
  94 struct regset ppcobsd_gregset =
  95 {
  96   &ppcobsd_reg_offsets,
  97   ppcobsd_supply_gregset
  98 };
  99
 100 /* Return the appropriate register set for the core section identified
 101    by SECT_NAME and SECT_SIZE.  */
 102
 103 static const struct regset *
 104 ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
 105                                   const char *sect_name, size_t sect_size)
 106 {
 107   if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
 108     return &ppcobsd_gregset;
 109
 110   return NULL;
 111 }
 112 \f
 113
 114 static void
 115 ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 116 {
 117   /* OpenBSD uses SVR4-style shared libraries.  */
 118   set_gdbarch_in_solib_call_trampoline
 119     (gdbarch, generic_in_solib_call_trampoline);
 120   set_solib_svr4_fetch_link_map_offsets
 121     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 122
 123   set_gdbarch_regset_from_core_section
 124     (gdbarch, ppcobsd_regset_from_core_section);
 125 }
 126 \f
 127
 128 /* OpenBSD uses uses the traditional NetBSD core file format, even for
 129    ports that use ELF.  */
 130 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
 131
 132 static enum gdb_osabi
 133 ppcobsd_core_osabi_sniffer (bfd *abfd)
 134 {
 135   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
 136     return GDB_OSABI_NETBSD_CORE;
 137
 138   return GDB_OSABI_UNKNOWN;
 139 }
 140 \f
 141
 142 /* Provide a prototype to silence -Wmissing-prototypes.  */
 143 void _initialize_ppcobsd_tdep (void);
 144
 145 void
 146 _initialize_ppcobsd_tdep (void)
 147 {
 148   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
 149   gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
 150                                   ppcobsd_core_osabi_sniffer);
 151
 152   gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
 153                           ppcobsd_init_abi);
 154
 155   /* Avoid initializing the register offsets again if they were
 156      already initailized by ppcobsd-nat.c.  */
 157   if (ppcobsd_reg_offsets.pc_offset == 0)
 158     {
 159       /* General-purpose registers.  */
 160       ppcobsd_reg_offsets.r0_offset = 0;
 161       ppcobsd_reg_offsets.pc_offset = 384;
 162       ppcobsd_reg_offsets.ps_offset = 388;
 163       ppcobsd_reg_offsets.cr_offset = 392;
 164       ppcobsd_reg_offsets.lr_offset = 396;
 165       ppcobsd_reg_offsets.ctr_offset = 400;
 166       ppcobsd_reg_offsets.xer_offset = 404;
 167       ppcobsd_reg_offsets.mq_offset = 408;
 168
 169       /* Floating-point registers.  */
 170       ppcobsd_reg_offsets.f0_offset = 128;
 171       ppcobsd_reg_offsets.fpscr_offset = -1;
 172
 173       /* AltiVec registers.  */
 174       ppcobsd_reg_offsets.vr0_offset = 0;
 175       ppcobsd_reg_offsets.vscr_offset = 512;
 176       ppcobsd_reg_offsets.vrsave_offset = 520;
 177     }
 178 }