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[binutils.git] / bfd / elf32-arc.c
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1 /* ARC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005
3 Free Software Foundation, Inc.
4 Contributed by Doug Evans (dje@cygnus.com).
6 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/arc.h"
28 #include "libiberty.h"
30 /* Try to minimize the amount of space occupied by relocation tables
31 on the ROM (not that the ROM won't be swamped by other ELF overhead). */
33 #define USE_REL 1
35 static bfd_reloc_status_type
36 arc_elf_b22_pcrel (bfd * abfd,
37 arelent * reloc_entry,
38 asymbol * symbol,
39 void * data,
40 asection * input_section,
41 bfd * output_bfd,
42 char ** error_message)
44 /* If linking, back up the final symbol address by the address of the
45 reloc. This cannot be accomplished by setting the pcrel_offset
46 field to TRUE, as bfd_install_relocation will detect this and refuse
47 to install the offset in the first place, but bfd_perform_relocation
48 will still insist on removing it. */
49 if (output_bfd == NULL)
50 reloc_entry->addend -= reloc_entry->address;
52 /* Fall through to the default elf reloc handler. */
53 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
54 input_section, output_bfd, error_message);
57 static reloc_howto_type elf_arc_howto_table[] =
59 /* This reloc does nothing. */
60 HOWTO (R_ARC_NONE, /* Type. */
61 0, /* Rightshift. */
62 2, /* Size (0 = byte, 1 = short, 2 = long). */
63 32, /* Bitsize. */
64 FALSE, /* PC_relative. */
65 0, /* Bitpos. */
66 complain_overflow_bitfield, /* Complain_on_overflow. */
67 bfd_elf_generic_reloc, /* Special_function. */
68 "R_ARC_NONE", /* Name. */
69 TRUE, /* Partial_inplace. */
70 0, /* Src_mask. */
71 0, /* Dst_mask. */
72 FALSE), /* PCrel_offset. */
74 /* A standard 32 bit relocation. */
75 HOWTO (R_ARC_32, /* Type. */
76 0, /* Rightshift. */
77 2, /* Size (0 = byte, 1 = short, 2 = long). */
78 32, /* Bitsize. */
79 FALSE, /* PC_relative. */
80 0, /* Bitpos. */
81 complain_overflow_bitfield, /* Complain_on_overflow. */
82 bfd_elf_generic_reloc, /* Special_function. */
83 "R_ARC_32", /* Name. */
84 TRUE, /* Partial_inplace. */
85 0xffffffff, /* Src_mask. */
86 0xffffffff, /* Dst_mask. */
87 FALSE), /* PCrel_offset. */
89 /* A 26 bit absolute branch, right shifted by 2. */
90 HOWTO (R_ARC_B26, /* Type. */
91 2, /* Rightshift. */
92 2, /* Size (0 = byte, 1 = short, 2 = long). */
93 26, /* Bitsize. */
94 FALSE, /* PC_relative. */
95 0, /* Bitpos. */
96 complain_overflow_bitfield, /* Complain_on_overflow. */
97 bfd_elf_generic_reloc, /* Special_function. */
98 "R_ARC_B26", /* Name. */
99 TRUE, /* Partial_inplace. */
100 0x00ffffff, /* Src_mask. */
101 0x00ffffff, /* Dst_mask. */
102 FALSE), /* PCrel_offset. */
104 /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
105 HOWTO (R_ARC_B22_PCREL, /* Type. */
106 2, /* Rightshift. */
107 2, /* Size (0 = byte, 1 = short, 2 = long). */
108 22, /* Bitsize. */
109 TRUE, /* PC_relative. */
110 7, /* Bitpos. */
111 complain_overflow_signed, /* Complain_on_overflow. */
112 arc_elf_b22_pcrel, /* Special_function. */
113 "R_ARC_B22_PCREL", /* Name. */
114 TRUE, /* Partial_inplace. */
115 0x07ffff80, /* Src_mask. */
116 0x07ffff80, /* Dst_mask. */
117 FALSE), /* PCrel_offset. */
120 /* Map BFD reloc types to ARC ELF reloc types. */
122 struct arc_reloc_map
124 bfd_reloc_code_real_type bfd_reloc_val;
125 unsigned char elf_reloc_val;
128 static const struct arc_reloc_map arc_reloc_map[] =
130 { BFD_RELOC_NONE, R_ARC_NONE, },
131 { BFD_RELOC_32, R_ARC_32 },
132 { BFD_RELOC_CTOR, R_ARC_32 },
133 { BFD_RELOC_ARC_B26, R_ARC_B26 },
134 { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
137 static reloc_howto_type *
138 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
139 bfd_reloc_code_real_type code)
141 unsigned int i;
143 for (i = ARRAY_SIZE (arc_reloc_map); i--;)
144 if (arc_reloc_map[i].bfd_reloc_val == code)
145 return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val;
147 return NULL;
150 /* Set the howto pointer for an ARC ELF reloc. */
152 static void
153 arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
154 arelent *cache_ptr,
155 Elf_Internal_Rela *dst)
157 unsigned int r_type;
159 r_type = ELF32_R_TYPE (dst->r_info);
160 BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
161 cache_ptr->howto = &elf_arc_howto_table[r_type];
164 /* Set the right machine number for an ARC ELF file. */
166 static bfd_boolean
167 arc_elf_object_p (bfd *abfd)
169 unsigned int mach = bfd_mach_arc_6;
171 if (elf_elfheader(abfd)->e_machine == EM_ARC)
173 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
175 switch (arch)
177 case E_ARC_MACH_ARC5:
178 mach = bfd_mach_arc_5;
179 break;
180 default:
181 case E_ARC_MACH_ARC6:
182 mach = bfd_mach_arc_6;
183 break;
184 case E_ARC_MACH_ARC7:
185 mach = bfd_mach_arc_7;
186 break;
187 case E_ARC_MACH_ARC8:
188 mach = bfd_mach_arc_8;
189 break;
192 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
195 /* The final processing done just before writing out an ARC ELF object file.
196 This gets the ARC architecture right based on the machine number. */
198 static void
199 arc_elf_final_write_processing (bfd *abfd,
200 bfd_boolean linker ATTRIBUTE_UNUSED)
202 unsigned long val;
204 switch (bfd_get_mach (abfd))
206 case bfd_mach_arc_5:
207 val = E_ARC_MACH_ARC5;
208 break;
209 default:
210 case bfd_mach_arc_6:
211 val = E_ARC_MACH_ARC6;
212 break;
213 case bfd_mach_arc_7:
214 val = E_ARC_MACH_ARC7;
215 break;
216 case bfd_mach_arc_8:
217 val = E_ARC_MACH_ARC8;
218 break;
220 elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
221 elf_elfheader (abfd)->e_flags |= val;
224 #define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec
225 #define TARGET_LITTLE_NAME "elf32-littlearc"
226 #define TARGET_BIG_SYM bfd_elf32_bigarc_vec
227 #define TARGET_BIG_NAME "elf32-bigarc"
228 #define ELF_ARCH bfd_arch_arc
229 #define ELF_MACHINE_CODE EM_ARC
230 #define ELF_MAXPAGESIZE 0x1000
232 #define elf_info_to_howto 0
233 #define elf_info_to_howto_rel arc_info_to_howto_rel
234 #define elf_backend_object_p arc_elf_object_p
235 #define elf_backend_final_write_processing arc_elf_final_write_processing
237 #include "elf32-target.h"