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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [alphafbsd-tdep.c] - Blame information for rev 840

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1 24 jeremybenn
/* Target-dependent code for FreeBSD/alpha.
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   Copyright (C) 2001, 2002, 2003, 2006, 2007, 2008
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   Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "value.h"
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#include "osabi.h"
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#include "alpha-tdep.h"
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#include "solib-svr4.h"
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static int
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alphafbsd_return_in_memory (struct type *type)
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{
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  enum type_code code;
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  int i;
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  /* All aggregate types that won't fit in a register must be returned
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     in memory.  */
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  if (TYPE_LENGTH (type) > ALPHA_REGISTER_SIZE)
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    return 1;
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  /* The only aggregate types that can be returned in a register are
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     structs and unions.  Arrays must be returned in memory.  */
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  code = TYPE_CODE (type);
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  if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION)
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    return 1;
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  /* We need to check if this struct/union is "integer" like.  For
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     this to be true, the offset of each adressable subfield must be
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     zero.  Note that bit fields are not addressable.  */
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  for (i = 0; i < TYPE_NFIELDS (type); i++)
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    {
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      /* If the field bitsize is non-zero, it isn't adressable.  */
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      if (TYPE_FIELD_BITPOS (type, i) != 0
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          && TYPE_FIELD_BITSIZE (type, i) == 0)
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        return 1;
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    }
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  return 0;
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}
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/* Support for signal handlers.  */
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/* Return whether PC is in a BSD sigtramp routine.  */
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CORE_ADDR alphafbsd_sigtramp_start = 0x11ffff68;
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CORE_ADDR alphafbsd_sigtramp_end = 0x11ffffe0;
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static int
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alphafbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
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{
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  return (pc >= alphafbsd_sigtramp_start && pc < alphafbsd_sigtramp_end);
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}
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static LONGEST
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alphafbsd_sigtramp_offset (CORE_ADDR pc)
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{
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  return pc - alphafbsd_sigtramp_start;
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}
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/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
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   routine, return the address of the associated sigcontext structure.  */
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static CORE_ADDR
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alphafbsd_sigcontext_addr (struct frame_info *next_frame)
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{
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  return frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM) + 24;
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}
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/* FreeBSD 5.0-RELEASE or later.  */
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static void
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alphafbsd_init_abi (struct gdbarch_info info,
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                    struct gdbarch *gdbarch)
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{
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  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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  /* Hook into the DWARF CFI frame unwinder.  */
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  alpha_dwarf2_init_abi (info, gdbarch);
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  /* Hook into the MDEBUG frame unwinder.  */
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  alpha_mdebug_init_abi (info, gdbarch);
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  /* FreeBSD/alpha has SVR4-style shared libraries.  */
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  set_solib_svr4_fetch_link_map_offsets
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    (gdbarch, svr4_lp64_fetch_link_map_offsets);
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  tdep->dynamic_sigtramp_offset = alphafbsd_sigtramp_offset;
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  tdep->sigcontext_addr = alphafbsd_sigcontext_addr;
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  tdep->pc_in_sigtramp = alphafbsd_pc_in_sigtramp;
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  tdep->return_in_memory = alphafbsd_return_in_memory;
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  tdep->sc_pc_offset = 288;
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  tdep->sc_regs_offset = 24;
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  tdep->sc_fpregs_offset = 320;
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  tdep->jb_pc = 2;
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  tdep->jb_elt_size = 8;
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}
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/* Provide a prototype to silence -Wmissing-prototypes.  */
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void _initialize_alphafbsd_tdep (void);
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void
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_initialize_alphafbsd_tdep (void)
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{
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  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_FREEBSD_ELF,
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                          alphafbsd_init_abi);
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}

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