source: branches/libc-0.6/src/binutils/bfd/elf32-arc.c

Last change on this file was 610, checked in by bird, 22 years ago

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1/* ARC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1997, 1999, 2001, 2002
3 Free Software Foundation, Inc.
4 Contributed by Doug Evans (dje@cygnus.com).
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22#include "bfd.h"
23#include "sysdep.h"
24#include "libbfd.h"
25#include "elf-bfd.h"
26#include "elf/arc.h"
27#include "libiberty.h"
28
29static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
30 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
31static void arc_info_to_howto_rel
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33static bfd_boolean arc_elf_object_p
34 PARAMS ((bfd *));
35static void arc_elf_final_write_processing
36 PARAMS ((bfd *, bfd_boolean));
37static bfd_reloc_status_type arc_elf_b22_pcrel
38 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
39
40/* Try to minimize the amount of space occupied by relocation tables
41 on the ROM (not that the ROM won't be swamped by other ELF overhead). */
42
43#define USE_REL 1
44
45static reloc_howto_type elf_arc_howto_table[] =
46{
47 /* This reloc does nothing. */
48 HOWTO (R_ARC_NONE, /* type */
49 0, /* rightshift */
50 2, /* size (0 = byte, 1 = short, 2 = long) */
51 32, /* bitsize */
52 FALSE, /* pc_relative */
53 0, /* bitpos */
54 complain_overflow_bitfield, /* complain_on_overflow */
55 bfd_elf_generic_reloc, /* special_function */
56 "R_ARC_NONE", /* name */
57 TRUE, /* partial_inplace */
58 0, /* src_mask */
59 0, /* dst_mask */
60 FALSE), /* pcrel_offset */
61
62 /* A standard 32 bit relocation. */
63 HOWTO (R_ARC_32, /* type */
64 0, /* rightshift */
65 2, /* size (0 = byte, 1 = short, 2 = long) */
66 32, /* bitsize */
67 FALSE, /* pc_relative */
68 0, /* bitpos */
69 complain_overflow_bitfield, /* complain_on_overflow */
70 bfd_elf_generic_reloc, /* special_function */
71 "R_ARC_32", /* name */
72 TRUE, /* partial_inplace */
73 0xffffffff, /* src_mask */
74 0xffffffff, /* dst_mask */
75 FALSE), /* pcrel_offset */
76
77 /* A 26 bit absolute branch, right shifted by 2. */
78 HOWTO (R_ARC_B26, /* type */
79 2, /* rightshift */
80 2, /* size (0 = byte, 1 = short, 2 = long) */
81 26, /* bitsize */
82 FALSE, /* pc_relative */
83 0, /* bitpos */
84 complain_overflow_bitfield, /* complain_on_overflow */
85 bfd_elf_generic_reloc, /* special_function */
86 "R_ARC_B26", /* name */
87 TRUE, /* partial_inplace */
88 0x00ffffff, /* src_mask */
89 0x00ffffff, /* dst_mask */
90 FALSE), /* pcrel_offset */
91
92 /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
93 HOWTO (R_ARC_B22_PCREL, /* type */
94 2, /* rightshift */
95 2, /* size (0 = byte, 1 = short, 2 = long) */
96 22, /* bitsize */
97 TRUE, /* pc_relative */
98 7, /* bitpos */
99 complain_overflow_signed, /* complain_on_overflow */
100 arc_elf_b22_pcrel, /* special_function */
101 "R_ARC_B22_PCREL", /* name */
102 TRUE, /* partial_inplace */
103 0x07ffff80, /* src_mask */
104 0x07ffff80, /* dst_mask */
105 FALSE), /* pcrel_offset */
106};
107
108/* Map BFD reloc types to ARC ELF reloc types. */
109
110struct arc_reloc_map
111{
112 bfd_reloc_code_real_type bfd_reloc_val;
113 unsigned char elf_reloc_val;
114};
115
116static const struct arc_reloc_map arc_reloc_map[] =
117{
118 { BFD_RELOC_NONE, R_ARC_NONE, },
119 { BFD_RELOC_32, R_ARC_32 },
120 { BFD_RELOC_CTOR, R_ARC_32 },
121 { BFD_RELOC_ARC_B26, R_ARC_B26 },
122 { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
123};
124
125static reloc_howto_type *
126bfd_elf32_bfd_reloc_type_lookup (abfd, code)
127 bfd *abfd ATTRIBUTE_UNUSED;
128 bfd_reloc_code_real_type code;
129{
130 unsigned int i;
131
132 for (i = ARRAY_SIZE (arc_reloc_map); i--;)
133 if (arc_reloc_map[i].bfd_reloc_val == code)
134 return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val;
135
136 return NULL;
137}
138
139/* Set the howto pointer for an ARC ELF reloc. */
140
141static void
142arc_info_to_howto_rel (abfd, cache_ptr, dst)
143 bfd *abfd ATTRIBUTE_UNUSED;
144 arelent *cache_ptr;
145 Elf_Internal_Rela *dst;
146{
147 unsigned int r_type;
148
149 r_type = ELF32_R_TYPE (dst->r_info);
150 BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
151 cache_ptr->howto = &elf_arc_howto_table[r_type];
152}
153
154/* Set the right machine number for an ARC ELF file. */
155
156static bfd_boolean
157arc_elf_object_p (abfd)
158 bfd *abfd;
159{
160 unsigned int mach = bfd_mach_arc_6;
161
162 if (elf_elfheader(abfd)->e_machine == EM_ARC)
163 {
164 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
165
166 switch (arch)
167 {
168 case E_ARC_MACH_ARC5:
169 mach = bfd_mach_arc_5;
170 break;
171 default:
172 case E_ARC_MACH_ARC6:
173 mach = bfd_mach_arc_6;
174 break;
175 case E_ARC_MACH_ARC7:
176 mach = bfd_mach_arc_7;
177 break;
178 case E_ARC_MACH_ARC8:
179 mach = bfd_mach_arc_8;
180 break;
181 }
182 }
183 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
184}
185
186/* The final processing done just before writing out an ARC ELF object file.
187 This gets the ARC architecture right based on the machine number. */
188
189static void
190arc_elf_final_write_processing (abfd, linker)
191 bfd *abfd;
192 bfd_boolean linker ATTRIBUTE_UNUSED;
193{
194 unsigned long val;
195
196 switch (bfd_get_mach (abfd))
197 {
198 case bfd_mach_arc_5:
199 val = E_ARC_MACH_ARC5;
200 break;
201 default:
202 case bfd_mach_arc_6:
203 val = E_ARC_MACH_ARC6;
204 break;
205 case bfd_mach_arc_7:
206 val = E_ARC_MACH_ARC7;
207 break;
208 case bfd_mach_arc_8:
209 val = E_ARC_MACH_ARC8;
210 break;
211 }
212 elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
213 elf_elfheader (abfd)->e_flags |= val;
214}
215
216bfd_reloc_status_type
217arc_elf_b22_pcrel (abfd, reloc_entry, symbol, data, input_section,
218 output_bfd, error_message)
219 bfd * abfd;
220 arelent * reloc_entry;
221 asymbol * symbol;
222 PTR data;
223 asection * input_section;
224 bfd * output_bfd;
225 char ** error_message;
226{
227 /* If linking, back up the final symbol address by the address of the
228 reloc. This cannot be accomplished by setting the pcrel_offset
229 field to TRUE, as bfd_install_relocation will detect this and refuse
230 to install the offset in the first place, but bfd_perform_relocation
231 will still insist on removing it. */
232 if (output_bfd == (bfd *) NULL)
233 reloc_entry->addend -= reloc_entry->address;
234
235 /* Fall through to the default elf reloc handler. */
236 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
237 input_section, output_bfd, error_message);
238}
239
240#define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec
241#define TARGET_LITTLE_NAME "elf32-littlearc"
242#define TARGET_BIG_SYM bfd_elf32_bigarc_vec
243#define TARGET_BIG_NAME "elf32-bigarc"
244#define ELF_ARCH bfd_arch_arc
245#define ELF_MACHINE_CODE EM_ARC
246#define ELF_MAXPAGESIZE 0x1000
247
248#define elf_info_to_howto 0
249#define elf_info_to_howto_rel arc_info_to_howto_rel
250#define elf_backend_object_p arc_elf_object_p
251#define elf_backend_final_write_processing arc_elf_final_write_processing
252
253#include "elf32-target.h"
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