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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [hppabsd-tdep.c] - Blame information for rev 227

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1 227 jeremybenn
/* Target-dependent code for HP PA-RISC BSD's.
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   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
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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 "objfiles.h"
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#include "target.h"
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#include "value.h"
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#include "elf/common.h"
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#include "hppa-tdep.h"
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#include "hppabsd-tdep.h"
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#include "solib-svr4.h"
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static CORE_ADDR
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hppabsd_find_global_pointer (struct gdbarch *gdbarch, struct value *function)
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{
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  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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  CORE_ADDR faddr = value_as_address (function);
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  struct obj_section *faddr_sec;
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  gdb_byte buf[4];
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  /* Is this a plabel? If so, dereference it to get the Global Pointer
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     value.  */
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  if (faddr & 2)
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    {
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      if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0)
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        return extract_unsigned_integer (buf, sizeof buf, byte_order);
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    }
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  /* If the address is in the .plt section, then the real function
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     hasn't yet been fixed up by the linker so we cannot determine the
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     Global Pointer for that function.  */
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  if (in_plt_section (faddr, NULL))
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    return 0;
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  faddr_sec = find_pc_section (faddr);
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  if (faddr_sec != NULL)
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    {
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      struct obj_section *sec;
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      ALL_OBJFILE_OSECTIONS (faddr_sec->objfile, sec)
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        {
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          if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0)
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            break;
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        }
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      if (sec < faddr_sec->objfile->sections_end)
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        {
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          CORE_ADDR addr = obj_section_addr (sec);
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          CORE_ADDR endaddr = obj_section_endaddr (sec);
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          while (addr < endaddr)
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            {
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              gdb_byte buf[4];
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              LONGEST tag;
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              if (target_read_memory (addr, buf, sizeof buf) != 0)
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                break;
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              tag = extract_signed_integer (buf, sizeof buf, byte_order);
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              if (tag == DT_PLTGOT)
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                {
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                  CORE_ADDR pltgot;
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                  if (target_read_memory (addr + 4, buf, sizeof buf) != 0)
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                    break;
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                  /* The NetBSD/OpenBSD ld.so doesn't relocate DT_PLTGOT, so
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                     we have to do it ourselves.  */
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                  pltgot = extract_unsigned_integer (buf, sizeof buf,
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                                                     byte_order);
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                  pltgot += ANOFFSET (sec->objfile->section_offsets,
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                                      SECT_OFF_TEXT (sec->objfile));
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                  return pltgot;
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                }
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              if (tag == DT_NULL)
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                break;
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              addr += 8;
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            }
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        }
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    }
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  return 0;
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}
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void
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hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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  /* OpenBSD and NetBSD have a 64-bit 'long double'.  */
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  set_gdbarch_long_double_bit (gdbarch, 64);
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  set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
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  /* OpenBSD and NetBSD use ELF.  */
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  tdep->is_elf = 1;
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  tdep->find_global_pointer = hppabsd_find_global_pointer;
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  tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline;
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  set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
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  /* OpenBSD and NetBSD use SVR4-style shared libraries.  */
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  set_solib_svr4_fetch_link_map_offsets
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    (gdbarch, svr4_ilp32_fetch_link_map_offsets);
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}

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