1/* PPC specific symbolic name handling.
2   Copyright (C) 2004 Red Hat, Inc.
3   Written by Ulrich Drepper <drepper@redhat.com>, 2004.
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_ppc.h>
24
25
26/* Return of the backend.  */
27const char *
28ppc_backend_name (void)
29{
30  return "ppc";
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    // XXX Check all the appear values.
42    [R_PPC_NONE] = { "R_PPC_NONE", both },
43    [R_PPC_ADDR32] = { "R_PPC_ADDR32", both },
44    [R_PPC_ADDR24] = { "R_PPC_ADDR24", both },
45    [R_PPC_ADDR16] = { "R_PPC_ADDR16", both },
46    [R_PPC_ADDR16_LO] = { "R_PPC_ADDR16_LO", both },
47    [R_PPC_ADDR16_HI] = { "R_PPC_ADDR16_HI", both },
48    [R_PPC_ADDR16_HA] = { "R_PPC_ADDR16_HA", both },
49    [R_PPC_ADDR14] = { "R_PPC_ADDR14", exec },
50    [R_PPC_ADDR14_BRTAKEN] = { "R_PPC_ADDR14_BRTAKEN", exec },
51    [R_PPC_ADDR14_BRNTAKEN] = { "R_PPC_ADDR14_BRNTAKEN", exec },
52    [R_PPC_REL24] = { "R_PPC_REL24", both },
53    [R_PPC_REL14] = { "R_PPC_REL14", both },
54    [R_PPC_REL14_BRTAKEN] = { "R_PPC_REL14_BRTAKEN", exec },
55    [R_PPC_REL14_BRNTAKEN] = { "R_PPC_REL14_BRNTAKEN", exec },
56    [R_PPC_GOT16] = { "R_PPC_GOT16", rel },
57    [R_PPC_GOT16_LO] = { "R_PPC_GOT16_LO", rel },
58    [R_PPC_GOT16_HI] = { "R_PPC_GOT16_HI", rel },
59    [R_PPC_GOT16_HA] = { "R_PPC_GOT16_HA", rel },
60    [R_PPC_PLTREL24] = { "R_PPC_PLTREL24", rel },
61    [R_PPC_COPY] = { "R_PPC_COPY", exec },
62    [R_PPC_GLOB_DAT] = { "R_PPC_GLOB_DAT", exec },
63    [R_PPC_JMP_SLOT] = { "R_PPC_JMP_SLOT", exec },
64    [R_PPC_RELATIVE] = { "R_PPC_RELATIVE", exec },
65    [R_PPC_LOCAL24PC] = { "R_PPC_LOCAL24PC", rel },
66    [R_PPC_UADDR32] = { "R_PPC_UADDR32", exec },
67    [R_PPC_UADDR16] = { "R_PPC_UADDR16", exec },
68    [R_PPC_REL32] = { "R_PPC_REL32", exec },
69    [R_PPC_PLT32] = { "R_PPC_PLT32", exec },
70    [R_PPC_PLTREL32] = { "R_PPC_PLTREL32", both },
71    [R_PPC_PLT16_LO] = { "R_PPC_PLT16_LO", both },
72    [R_PPC_PLT16_HI] = { "R_PPC_PLT16_HI", both },
73    [R_PPC_PLT16_HA] = { "R_PPC_PLT16_HA", both },
74    [R_PPC_SDAREL16] = { "R_PPC_SDAREL16", both },
75    [R_PPC_SECTOFF] = { "R_PPC_SECTOFF", both },
76    [R_PPC_SECTOFF_LO] = { "R_PPC_SECTOFF_LO", both },
77    [R_PPC_SECTOFF_HI] = { "R_PPC_SECTOFF_HI", both },
78    [R_PPC_SECTOFF_HA] = { "R_PPC_SECTOFF_HA", both },
79    [R_PPC_TLS] = { "R_PPC_TLS", both },
80    [R_PPC_DTPMOD32] = { "R_PPC_DTPMOD32", exec },
81    [R_PPC_TPREL16] = { "R_PPC_TPREL16", rel },
82    [R_PPC_TPREL16_LO] = { "R_PPC_TPREL16_LO", rel },
83    [R_PPC_TPREL16_HI] = { "R_PPC_TPREL16_HI", rel },
84    [R_PPC_TPREL16_HA] = { "R_PPC_TPREL16_HA", rel },
85    [R_PPC_TPREL32] = { "R_PPC_TPREL32", exec },
86    [R_PPC_DTPREL16] = { "R_PPC_DTPREL16", rel },
87    [R_PPC_DTPREL16_LO] = { "R_PPC_DTPREL16_LO", rel },
88    [R_PPC_DTPREL16_HI] = { "R_PPC_DTPREL16_HI", rel },
89    [R_PPC_DTPREL16_HA] = { "R_PPC_DTPREL16_HA", rel },
90    [R_PPC_DTPREL32] = { "R_PPC_DTPREL32", exec },
91    [R_PPC_GOT_TLSGD16] = { "R_PPC_GOT_TLSGD16", exec },
92    [R_PPC_GOT_TLSGD16_LO] = { "R_PPC_GOT_TLSGD16_LO", exec },
93    [R_PPC_GOT_TLSGD16_HI] = { "R_PPC_GOT_TLSGD16_HI", exec },
94    [R_PPC_GOT_TLSGD16_HA] = { "R_PPC_GOT_TLSGD16_HA", exec },
95    [R_PPC_GOT_TLSLD16] = { "R_PPC_GOT_TLSLD16", exec },
96    [R_PPC_GOT_TLSLD16_LO] = { "R_PPC_GOT_TLSLD16_LO", exec },
97    [R_PPC_GOT_TLSLD16_HI] = { "R_PPC_GOT_TLSLD16_HI", exec },
98    [R_PPC_GOT_TLSLD16_HA] = { "R_PPC_GOT_TLSLD16_HA", exec },
99    [R_PPC_GOT_TPREL16] = { "R_PPC_GOT_TPREL16", exec },
100    [R_PPC_GOT_TPREL16_LO] = { "R_PPC_GOT_TPREL16_LO", exec },
101    [R_PPC_GOT_TPREL16_HI] = { "R_PPC_GOT_TPREL16_HI", exec },
102    [R_PPC_GOT_TPREL16_HA] = { "R_PPC_GOT_TPREL16_HA", exec },
103    [R_PPC_GOT_DTPREL16] = { "R_PPC_GOT_DTPREL16", exec },
104    [R_PPC_GOT_DTPREL16_LO] = { "R_PPC_GOT_DTPREL16_LO", exec },
105    [R_PPC_GOT_DTPREL16_HI] = { "R_PPC_GOT_DTPREL16_HI", exec },
106    [R_PPC_GOT_DTPREL16_HA] = { "R_PPC_GOT_DTPREL16_HA", exec }
107  };
108
109
110/* Determine relocation type string for PPC.  */
111const char *
112ppc_reloc_type_name (int type, char *buf, size_t len)
113{
114  if (type < 0 || type >= R_PPC_NUM)
115    return NULL;
116
117  return reloc_map_table[type].name;
118}
119
120
121/* Check for correct relocation type.  */
122bool
123ppc_reloc_type_check (int type)
124{
125  return (type >= R_PPC_NONE && type < R_PPC_NUM
126	  && reloc_map_table[type].name != NULL) ? true : false;
127}
128
129
130/* Check for correct relocation type use.  */
131bool
132ppc_reloc_valid_use (Elf *elf, int type)
133{
134  if (type < R_PPC_NONE || type >= R_PPC_NUM
135      || reloc_map_table[type].name == NULL)
136    return false;
137
138  Elf32_Ehdr *ehdr = elf32_getehdr (elf);
139  assert (ehdr != NULL);
140
141  if (reloc_map_table[type].appear == rel)
142    return ehdr->e_type == ET_REL;
143
144  if (reloc_map_table[type].appear == exec)
145    return ehdr->e_type != ET_REL;
146
147  assert (reloc_map_table[type].appear == both);
148  return true;
149}
150