1 /* ARC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007
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 3 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. */
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). */
35 static bfd_reloc_status_type
36 arc_elf_b22_pcrel (bfd * abfd,
37 arelent * reloc_entry,
40 asection * input_section,
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. */
62 2, /* Size (0 = byte, 1 = short, 2 = long). */
64 FALSE, /* PC_relative. */
66 complain_overflow_bitfield, /* Complain_on_overflow. */
67 bfd_elf_generic_reloc, /* Special_function. */
68 "R_ARC_NONE", /* Name. */
69 TRUE, /* Partial_inplace. */
72 FALSE), /* PCrel_offset. */
74 /* A standard 32 bit relocation. */
75 HOWTO (R_ARC_32, /* Type. */
77 2, /* Size (0 = byte, 1 = short, 2 = long). */
79 FALSE, /* PC_relative. */
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. */
92 2, /* Size (0 = byte, 1 = short, 2 = long). */
94 FALSE, /* PC_relative. */
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. */
107 2, /* Size (0 = byte, 1 = short, 2 = long). */
109 TRUE, /* PC_relative. */
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. */
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)
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;
150 static reloc_howto_type *
151 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
157 i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]);
159 if (elf_arc_howto_table[i].name != NULL
160 && strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
161 return &elf_arc_howto_table[i];
166 /* Set the howto pointer for an ARC ELF reloc. */
169 arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
171 Elf_Internal_Rela *dst)
175 r_type = ELF32_R_TYPE (dst->r_info);
176 BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
177 cache_ptr->howto = &elf_arc_howto_table[r_type];
180 /* Set the right machine number for an ARC ELF file. */
183 arc_elf_object_p (bfd *abfd)
185 unsigned int mach = bfd_mach_arc_6;
187 if (elf_elfheader(abfd)->e_machine == EM_ARC)
189 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
193 case E_ARC_MACH_ARC5:
194 mach = bfd_mach_arc_5;
197 case E_ARC_MACH_ARC6:
198 mach = bfd_mach_arc_6;
200 case E_ARC_MACH_ARC7:
201 mach = bfd_mach_arc_7;
203 case E_ARC_MACH_ARC8:
204 mach = bfd_mach_arc_8;
208 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
211 /* The final processing done just before writing out an ARC ELF object file.
212 This gets the ARC architecture right based on the machine number. */
215 arc_elf_final_write_processing (bfd *abfd,
216 bfd_boolean linker ATTRIBUTE_UNUSED)
220 switch (bfd_get_mach (abfd))
223 val = E_ARC_MACH_ARC5;
227 val = E_ARC_MACH_ARC6;
230 val = E_ARC_MACH_ARC7;
233 val = E_ARC_MACH_ARC8;
236 elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
237 elf_elfheader (abfd)->e_flags |= val;
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
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
253 #include "elf32-target.h"