1/* x86_64 specific symbolic name handling.
2   Copyright (C) 2002 Red Hat, Inc.
3   Written by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5   This program is Open Source software; you can redistribute it and/or
6   modify it under the terms of the Open Software License version 1.0 as
7   published by the Open Source Initiative.
8
9   You should have received a copy of the Open Software License along
10   with this program; if not, you may obtain a copy of the Open Software
11   License version 1.0 from http://www.opensource.org/licenses/osl.php or
12   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
13   3001 King Ranch Road, Ukiah, CA 95482.   */
14
15#ifdef HAVE_CONFIG_H
16# include <config.h>
17#endif
18
19#include <assert.h>
20#include <elf.h>
21#include <stddef.h>
22
23#include <libebl_x86_64.h>
24
25
26/* Return of the backend.  */
27const char *
28x86_64_backend_name (void)
29{
30  return "x86-64";
31}
32
33
34/* Relocation mapping table.  */
35static struct
36{
37  const char *name;
38  enum { both = 0, rel = 1, exec = 2 } appear;
39} reloc_map_table[] =
40  {
41    [R_X86_64_NONE] = { "R_X86_64_NONE", both },
42    [R_X86_64_64] = { "R_X86_64_64", rel },
43    [R_X86_64_PC32] = { "R_X86_64_PC32", rel },
44    [R_X86_64_GOT32] = { "R_X86_64_GOT32", rel },
45    [R_X86_64_PLT32] = { "R_X86_64_PLT32", rel },
46    [R_X86_64_COPY] = { "R_X86_64_COPY", exec },
47    [R_X86_64_GLOB_DAT] = { "R_X86_64_GLOB_DAT", exec },
48    [R_X86_64_JUMP_SLOT] = { "R_X86_64_JUMP_SLOT", exec },
49    [R_X86_64_RELATIVE] = { "R_X86_64_RELATIVE", exec },
50    [R_X86_64_GOTPCREL] = { "R_X86_64_GOTPCREL", exec },
51    [R_X86_64_32] = { "R_X86_64_32", rel },
52    [R_X86_64_32S] = { "R_X86_64_32S", rel },
53    [R_X86_64_16] = { "R_X86_64_16", rel },
54    [R_X86_64_PC16] = { "R_X86_64_PC16", rel },
55    [R_X86_64_8] = { "R_X86_64_8", rel },
56    [R_X86_64_PC8] = { "R_X86_64_PC8", rel },
57    [R_X86_64_DTPMOD64] = { "R_X86_64_DTPMOD64", rel },
58    [R_X86_64_DTPOFF64] = { "R_X86_64_DTPOFF64", rel },
59    [R_X86_64_TPOFF64] = { "R_X86_64_TPOFF64", rel },
60    [R_X86_64_TLSGD] = { "R_X86_64_TLSGD", rel },
61    [R_X86_64_TLSLD] = { "R_X86_64_TLSLD", rel },
62    [R_X86_64_DTPOFF32] = { "R_X86_64_DTPOFF32", rel },
63    [R_X86_64_GOTTPOFF] = { "R_X86_64_GOTTPOFF", rel },
64    [R_X86_64_TPOFF32] = { "R_X86_64_TPOFF32", rel }
65  };
66
67
68/* Determine relocation type string for x86-64.  */
69const char *
70x86_64_reloc_type_name (int type, char *buf, size_t len)
71{
72  if (type < 0 || type >= R_X86_64_NUM)
73    return NULL;
74
75  return reloc_map_table[type].name;
76}
77
78
79/* Check for correct relocation type.  */
80bool
81x86_64_reloc_type_check (int type)
82{
83  return (type >= R_X86_64_NONE && type < R_X86_64_NUM
84	  && reloc_map_table[type].name != NULL) ? true : false;
85}
86
87
88/* Check for correct relocation type use.  */
89bool
90x86_64_reloc_valid_use (Elf *elf, int type)
91{
92  if (type < R_X86_64_NONE || type >= R_X86_64_NUM
93      || reloc_map_table[type].name == NULL)
94    return false;
95
96  Elf64_Ehdr *ehdr = elf64_getehdr (elf);
97  assert (ehdr != NULL);
98
99  if (reloc_map_table[type].appear == rel)
100    return ehdr->e_type == ET_REL;
101
102  if (reloc_map_table[type].appear == exec)
103    return ehdr->e_type != ET_REL;
104
105  assert (reloc_map_table[type].appear == both);
106  return true;
107}
108