1/* Initialization of PPC64 specific backend library.
2   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013, 2014 Red Hat, Inc.
3   This file is part of elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2004.
5
6   This file is free software; you can redistribute it and/or modify
7   it under the terms of either
8
9     * the GNU Lesser General Public License as published by the Free
10       Software Foundation; either version 3 of the License, or (at
11       your option) any later version
12
13   or
14
15     * the GNU General Public License as published by the Free
16       Software Foundation; either version 2 of the License, or (at
17       your option) any later version
18
19   or both in parallel, as here.
20
21   elfutils is distributed in the hope that it will be useful, but
22   WITHOUT ANY WARRANTY; without even the implied warranty of
23   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
24   General Public License for more details.
25
26   You should have received copies of the GNU General Public License and
27   the GNU Lesser General Public License along with this program.  If
28   not, see <http://www.gnu.org/licenses/>.  */
29
30#ifdef HAVE_CONFIG_H
31# include <config.h>
32#endif
33
34#include <string.h>
35
36#define BACKEND		ppc64_
37#define RELOC_PREFIX	R_PPC64_
38#include "libebl_CPU.h"
39
40/* This defines the common reloc hooks based on ppc64_reloc.def.  */
41#include "common-reloc.c"
42
43
44const char *
45ppc64_init (Elf *elf __attribute__ ((unused)),
46	    GElf_Half machine __attribute__ ((unused)),
47	    Ebl *eh,
48	    size_t ehlen)
49{
50  /* Check whether the Elf_BH object has a sufficent size.  */
51  if (ehlen < sizeof (Ebl))
52    return NULL;
53
54  /* We handle it.  */
55  eh->name = "PowerPC 64-bit";
56  ppc64_init_reloc (eh);
57  HOOK (eh, reloc_simple_type);
58  HOOK (eh, dynamic_tag_name);
59  HOOK (eh, dynamic_tag_check);
60  HOOK (eh, machine_flag_check);
61  HOOK (eh, copy_reloc_p);
62  HOOK (eh, check_special_symbol);
63  HOOK (eh, check_st_other_bits);
64  HOOK (eh, bss_plt_p);
65  HOOK (eh, return_value_location);
66  HOOK (eh, register_info);
67  HOOK (eh, syscall_abi);
68  HOOK (eh, core_note);
69  HOOK (eh, auxv_info);
70  HOOK (eh, abi_cfi);
71  /* gcc/config/ #define DWARF_FRAME_REGISTERS.  */
72  eh->frame_nregs = (114 - 1) + 32;
73  HOOK (eh, set_initial_registers_tid);
74  HOOK (eh, dwarf_to_regno);
75  HOOK (eh, resolve_sym_value);
76
77  /* Find the function descriptor .opd table for resolve_sym_value.  */
78  if (elf != NULL)
79    {
80      GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (elf, &ehdr_mem);
81      if (ehdr != NULL && ehdr->e_type != ET_REL)
82	{
83	  /* We could also try through DT_PPC64_OPD and DT_PPC64_OPDSZ. */
84	  GElf_Shdr opd_shdr_mem, *opd_shdr;
85	  Elf_Scn *scn = NULL;
86	  while ((scn = elf_nextscn (elf, scn)) != NULL)
87	    {
88	      opd_shdr = gelf_getshdr (scn, &opd_shdr_mem);
89	      if (opd_shdr != NULL
90		  && (opd_shdr->sh_flags & SHF_ALLOC) != 0
91		  && opd_shdr->sh_type == SHT_PROGBITS
92		  && opd_shdr->sh_size > 0)
93		{
94		  const char *name = elf_strptr (elf, ehdr->e_shstrndx,
95						 opd_shdr->sh_name);
96		  if (name != NULL && strcmp (name, ".opd") == 0)
97		    {
98		      eh->fd_addr = opd_shdr->sh_addr;
99		      eh->fd_data = elf_getdata (scn, NULL);
100		      break;
101		    }
102		}
103	    }
104	}
105    }
106
107  return MODVERSION;
108}
109