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2001-01-03 Philip Blundell <pb@futuretv.com>
[binutils.git] / bfd / elf32-pj.c
blob81759ff4698d2ff7037b4c7571130a1e6ef901fc
1 /* picoJava specific support for 32-bit ELF
2 Copyright 1999 Free Software Foundation, Inc.
3 Contributed by Steve Chamberlan of Transmeta (sac@pobox.com).
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/pj.h"
27
28 static bfd_reloc_status_type pj_elf_reloc
29 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
30 static reloc_howto_type *pj_elf_reloc_type_lookup
31 PARAMS ((bfd *, bfd_reloc_code_real_type));
32 static void pj_elf_info_to_howto
33 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
34
35 static reloc_howto_type pj_elf_howto_table[] =
36 {
37 /* No relocation. */
38 HOWTO (R_PJ_NONE, /* type */
39 0, /* rightshift */
40 0, /* size (0 = byte, 1 = short, 2 = long) */
41 0, /* bitsize */
42 false, /* pc_relative */
43 0, /* bitpos */
44 complain_overflow_dont, /* complain_on_overflow */
45 pj_elf_reloc, /* special_function */
46 "R_PJ_NONE", /* name */
47 false, /* partial_inplace */
48 0, /* src_mask */
49 0, /* dst_mask */
50 false), /* pcrel_offset */
51
52 /* 32 bit absolute relocation. Setting partial_inplace to true and
53 src_mask to a non-zero value is similar to the COFF toolchain. */
54 HOWTO (R_PJ_DATA_DIR32, /* type */
55 0, /* rightshift */
56 2, /* size (0 = byte, 1 = short, 2 = long) */
57 32, /* bitsize */
58 false, /* pc_relative */
59 0, /* bitpos */
60 complain_overflow_bitfield, /* complain_on_overflow */
61 pj_elf_reloc, /* special_function */
62 "R_PJ_DIR32", /* name */
63 true, /* partial_inplace */
64 0xffffffff, /* src_mask */
65 0xffffffff, /* dst_mask */
66 false), /* pcrel_offset */
67
68 /* 32 bit PC relative relocation. */
69 HOWTO (R_PJ_CODE_REL32, /* type */
70 0, /* rightshift */
71 2, /* size (0 = byte, 1 = short, 2 = long) */
72 32, /* bitsize */
73 true, /* pc_relative */
74 0, /* bitpos */
75 complain_overflow_signed, /* complain_on_overflow */
76 pj_elf_reloc, /* special_function */
77 "R_PJ_REL32", /* name */
78 false, /* partial_inplace */
79 0, /* src_mask */
80 0xffffffff, /* dst_mask */
81 true), /* pcrel_offset */
82
83 /* 16 bit PC relative relocation. */
84 HOWTO (R_PJ_CODE_REL16, /* type */
85 0, /* rightshift */
86 1, /* size (0 = byte, 1 = short, 2 = long) */
87 16, /* bitsize */
88 true, /* pc_relative */
89 0, /* bitpos */
90 complain_overflow_signed, /* complain_on_overf6w */
91 pj_elf_reloc, /* special_function */
92 "R_PJ_REL16", /* name */
93 false, /* partial_inplace */
94 0xffff, /* src_mask */
95 0xffff, /* dst_mask */
96 true), /* pcrel_offset */
97 EMPTY_HOWTO (4),
98 EMPTY_HOWTO (5),
99 HOWTO (R_PJ_CODE_DIR32, /* type */
100 0, /* rightshift */
101 2, /* size (0 = byte, 1 = short, 2 = long) */
102 32, /* bitsize */
103 false, /* pc_relative */
104 0, /* bitpos */
105 complain_overflow_bitfield, /* complain_on_overflow */
106 pj_elf_reloc, /* special_function */
107 "R_PJ_CODE_DIR32", /* name */
108 true, /* partial_inplace */
109 0xffffffff, /* src_mask */
110 0xffffffff, /* dst_mask */
111 false), /* pcrel_offset */
112
113 EMPTY_HOWTO (7),
114 EMPTY_HOWTO (8),
115 EMPTY_HOWTO (9),
116 EMPTY_HOWTO (10),
117 EMPTY_HOWTO (11),
118 EMPTY_HOWTO (12),
119
120 HOWTO (R_PJ_CODE_LO16, /* type */
121 0, /* rightshift */
122 1, /* size (0 = byte, 1 = short, 2 = long) */
123 16, /* bitsize */
124 false, /* pc_relative */
125 0, /* bitpos */
126 complain_overflow_unsigned, /* complain_on_overflow */
127 pj_elf_reloc, /* special_function */
128 "R_PJ_LO16", /* name */
129 false, /* partial_inplace */
130 0xffff, /* src_mask */
131 0xffff, /* dst_mask */
132 true), /* pcrel_offset */
133
134 HOWTO (R_PJ_CODE_HI16, /* type */
135 16, /* rightshift */
136 1, /* size (0 = byte, 1 = short, 2 = long) */
137 16, /* bitsize */
138 false, /* pc_relative */
139 0, /* bitpos */
140 complain_overflow_unsigned, /* complain_on_overflow */
141 pj_elf_reloc, /* special_function */
142 "R_PJ_HI16", /* name */
143 false, /* partial_inplace */
144 0xffff, /* src_mask */
145 0xffff, /* dst_mask */
146 true), /* pcrel_offset */
147
148 /* GNU extension to record C++ vtable hierarchy */
149 HOWTO (R_PJ_GNU_VTINHERIT, /* type */
150 0, /* rightshift */
151 2, /* size (0 = byte, 1 = short, 2 = long) */
152 0, /* bitsize */
153 false, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 NULL, /* special_function */
157 "R_PJ_GNU_VTINHERIT", /* name */
158 false, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
161 false), /* pcrel_offset */
162
163 /* GNU extension to record C++ vtable member usage */
164 HOWTO (R_PJ_GNU_VTENTRY, /* type */
165 0, /* rightshift */
166 2, /* size (0 = byte, 1 = short, 2 = long) */
167 0, /* bitsize */
168 false, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_dont, /* complain_on_overflow */
171 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
172 "R_PJ_GNU_VTENTRY", /* name */
173 false, /* partial_inplace */
174 0, /* src_mask */
175 0, /* dst_mask */
176 false), /* pcrel_offset */
177
178 };
179
180 /* This function is used for normal relocs. This is like the COFF
181 function, and is almost certainly incorrect for other ELF targets. */
182
183 static bfd_reloc_status_type
184 pj_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
185 error_message)
186 bfd *abfd;
187 arelent *reloc_entry;
188 asymbol *symbol_in;
189 PTR data;
190 asection *input_section;
191 bfd *output_bfd;
192 char **error_message ATTRIBUTE_UNUSED;
193 {
194 unsigned long insn;
195 bfd_vma sym_value;
196 enum elf_pj_reloc_type r_type;
197 bfd_vma addr = reloc_entry->address;
198 bfd_byte *hit_data = addr + (bfd_byte *) data;
199
200 r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
201
202 if (output_bfd != NULL)
203 {
204 /* Partial linking--do nothing. */
205 reloc_entry->address += input_section->output_offset;
206 return bfd_reloc_ok;
207 }
208
209 if (symbol_in != NULL
210 && bfd_is_und_section (symbol_in->section))
211 return bfd_reloc_undefined;
212
213 if (bfd_is_com_section (symbol_in->section))
214 sym_value = 0;
215 else
216 sym_value = (symbol_in->value +
217 symbol_in->section->output_section->vma +
218 symbol_in->section->output_offset);
219
220 switch (r_type)
221 {
222 case R_PJ_DATA_DIR32:
223 insn = bfd_get_32 (abfd, hit_data);
224 insn += sym_value + reloc_entry->addend;
225 bfd_put_32 (abfd, insn, hit_data);
226 break;
227
228 /* Relocations in code are always bigendian, no matter what the
229 data endianness is. */
230
231 case R_PJ_CODE_DIR32:
232 insn = bfd_getb32 (hit_data);
233 insn += sym_value + reloc_entry->addend;
234 bfd_putb32 (insn, hit_data);
235 break;
236
237 case R_PJ_CODE_REL16:
238 insn = bfd_getb16 (hit_data);
239 insn += sym_value + reloc_entry->addend
240 - (input_section->output_section->vma
241 + input_section->output_offset);
242 bfd_putb16 (insn, hit_data);
243 break;
244 case R_PJ_CODE_LO16:
245 insn = bfd_getb16 (hit_data);
246 insn += sym_value + reloc_entry->addend;
247 bfd_putb16 (insn, hit_data);
248 break;
249
250 case R_PJ_CODE_HI16:
251 insn = bfd_getb16 (hit_data);
252 insn += (sym_value + reloc_entry->addend) >> 16;
253 bfd_putb16 (insn, hit_data);
254 break;
255
256 default:
257 abort ();
258 break;
259 }
260
261 return bfd_reloc_ok;
262 }
263
264 /* This structure is used to map BFD reloc codes to PJ ELF relocs. */
265
266 struct elf_reloc_map
267 {
268 bfd_reloc_code_real_type bfd_reloc_val;
269 unsigned char elf_reloc_val;
270 };
271
272 /* An array mapping BFD reloc codes to PJ ELF relocs. */
273
274 static const struct elf_reloc_map pj_reloc_map[] =
275 {
276 { BFD_RELOC_NONE, R_PJ_NONE },
277 { BFD_RELOC_32, R_PJ_DATA_DIR32 },
278 { BFD_RELOC_PJ_CODE_DIR16, R_PJ_CODE_DIR16 },
279 { BFD_RELOC_PJ_CODE_DIR32, R_PJ_CODE_DIR32 },
280 { BFD_RELOC_PJ_CODE_LO16, R_PJ_CODE_LO16 },
281 { BFD_RELOC_PJ_CODE_HI16, R_PJ_CODE_HI16 },
282 { BFD_RELOC_PJ_CODE_REL32, R_PJ_CODE_REL32 },
283 { BFD_RELOC_PJ_CODE_REL16, R_PJ_CODE_REL16 },
284 { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
285 { BFD_RELOC_VTABLE_ENTRY, R_PJ_GNU_VTENTRY },
286 };
287
288 /* Given a BFD reloc code, return the howto structure for the
289 corresponding PJ ELf reloc. */
290
291 static reloc_howto_type *
292 pj_elf_reloc_type_lookup (abfd, code)
293 bfd *abfd ATTRIBUTE_UNUSED;
294 bfd_reloc_code_real_type code;
295 {
296 unsigned int i;
297
298 for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
299 {
300 if (pj_reloc_map[i].bfd_reloc_val == code)
301 return &pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
302 }
303
304 return NULL;
305 }
306
307 /* Given an ELF reloc, fill in the howto field of a relent. */
308
309 static void
310 pj_elf_info_to_howto (abfd, cache_ptr, dst)
311 bfd *abfd ATTRIBUTE_UNUSED;
312 arelent *cache_ptr;
313 Elf_Internal_Rela *dst;
314 {
315 unsigned int r;
316
317 r = ELF32_R_TYPE (dst->r_info);
318
319 BFD_ASSERT (r < (unsigned int) R_PJ_max);
320
321 cache_ptr->howto = &pj_elf_howto_table[r];
322 }
323
324 /* Take this moment to fill in the special picoJava bits in the
325 e_flags field. */
326
327 static void
328 pj_elf_final_write_processing (abfd, linker)
329 bfd *abfd;
330 boolean linker ATTRIBUTE_UNUSED;
331 {
332 elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
333 elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
334 }
335
336 #define TARGET_BIG_SYM bfd_elf32_pj_vec
337 #define TARGET_BIG_NAME "elf32-pj"
338 #define TARGET_LITTLE_SYM bfd_elf32_pjl_vec
339 #define TARGET_LITTLE_NAME "elf32-pjl"
340 #define ELF_ARCH bfd_arch_pj
341 #define ELF_MACHINE_CODE EM_PJ
342 #define ELF_MAXPAGESIZE 0x1000
343 #define bfd_elf32_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
344 #define bfd_elf32_bfd_reloc_type_lookup pj_elf_reloc_type_lookup
345 #define elf_backend_final_write_processing pj_elf_final_write_processing
346 #define elf_info_to_howto pj_elf_info_to_howto
347 #include "elf32-target.h"
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