1 /* picoJava specific support for 32-bit ELF
2 Copyright (C) 1999-2023 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/pj.h"
28
29 /* This function is used for normal relocs. This is like the COFF
30 function, and is almost certainly incorrect for other ELF targets. */
31
32 static bfd_reloc_status_type
33 pj_elf_reloc (bfd *abfd,
34 arelent *reloc_entry,
35 asymbol *symbol_in,
36 void * data,
37 asection *input_section,
38 bfd *output_bfd,
39 char **error_message ATTRIBUTE_UNUSED)
40 {
41 unsigned long insn;
42 bfd_vma sym_value;
43 enum elf_pj_reloc_type r_type;
44 bfd_vma addr = reloc_entry->address;
45 bfd_byte *hit_data = addr + (bfd_byte *) data;
46
47 r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
48
49 if (output_bfd != NULL)
50 {
51 /* Partial linking--do nothing. */
52 reloc_entry->address += input_section->output_offset;
53 return bfd_reloc_ok;
54 }
55
56 if (symbol_in != NULL
57 && (symbol_in->flags & BSF_WEAK) == 0
58 && bfd_is_und_section (symbol_in->section))
59 return bfd_reloc_undefined;
60
61 if (bfd_is_com_section (symbol_in->section))
62 sym_value = 0;
63 else
64 sym_value = (symbol_in->value +
65 symbol_in->section->output_section->vma +
66 symbol_in->section->output_offset);
67
68 switch (r_type)
69 {
70 case R_PJ_DATA_DIR32:
71 insn = bfd_get_32 (abfd, hit_data);
72 insn += sym_value + reloc_entry->addend;
73 bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
74 break;
75
76 /* Relocations in code are always bigendian, no matter what the
77 data endianness is. */
78
79 case R_PJ_CODE_DIR32:
80 insn = bfd_getb32 (hit_data);
81 insn += sym_value + reloc_entry->addend;
82 bfd_putb32 ((bfd_vma) insn, hit_data);
83 break;
84
85 case R_PJ_CODE_REL16:
86 insn = bfd_getb16 (hit_data);
87 insn += sym_value + reloc_entry->addend
88 - (input_section->output_section->vma
89 + input_section->output_offset);
90 bfd_putb16 ((bfd_vma) insn, hit_data);
91 break;
92 case R_PJ_CODE_LO16:
93 insn = bfd_getb16 (hit_data);
94 insn += sym_value + reloc_entry->addend;
95 bfd_putb16 ((bfd_vma) insn, hit_data);
96 break;
97
98 case R_PJ_CODE_HI16:
99 insn = bfd_getb16 (hit_data);
100 insn += (sym_value + reloc_entry->addend) >> 16;
101 bfd_putb16 ((bfd_vma) insn, hit_data);
102 break;
103
104 default:
105 abort ();
106 break;
107 }
108
109 return bfd_reloc_ok;
110 }
111
112 static reloc_howto_type pj_elf_howto_table[] =
113 {
114 /* No relocation. */
115 HOWTO (R_PJ_NONE, /* type */
116 0, /* rightshift */
117 0, /* size */
118 0, /* bitsize */
119 false, /* pc_relative */
120 0, /* bitpos */
121 complain_overflow_dont, /* complain_on_overflow */
122 pj_elf_reloc, /* special_function */
123 "R_PJ_NONE", /* name */
124 false, /* partial_inplace */
125 0, /* src_mask */
126 0, /* dst_mask */
127 false), /* pcrel_offset */
128
129 /* 32 bit absolute relocation. Setting partial_inplace to TRUE and
130 src_mask to a non-zero value is similar to the COFF toolchain. */
131 HOWTO (R_PJ_DATA_DIR32, /* type */
132 0, /* rightshift */
133 4, /* size */
134 32, /* bitsize */
135 false, /* pc_relative */
136 0, /* bitpos */
137 complain_overflow_bitfield, /* complain_on_overflow */
138 pj_elf_reloc, /* special_function */
139 "R_PJ_DIR32", /* name */
140 true, /* partial_inplace */
141 0xffffffff, /* src_mask */
142 0xffffffff, /* dst_mask */
143 false), /* pcrel_offset */
144
145 /* 32 bit PC relative relocation. */
146 HOWTO (R_PJ_CODE_REL32, /* type */
147 0, /* rightshift */
148 4, /* size */
149 32, /* bitsize */
150 true, /* pc_relative */
151 0, /* bitpos */
152 complain_overflow_signed, /* complain_on_overflow */
153 pj_elf_reloc, /* special_function */
154 "R_PJ_REL32", /* name */
155 false, /* partial_inplace */
156 0, /* src_mask */
157 0xffffffff, /* dst_mask */
158 true), /* pcrel_offset */
159
160 /* 16 bit PC relative relocation. */
161 HOWTO (R_PJ_CODE_REL16, /* type */
162 0, /* rightshift */
163 2, /* size */
164 16, /* bitsize */
165 true, /* pc_relative */
166 0, /* bitpos */
167 complain_overflow_signed, /* complain_on_overf6w */
168 pj_elf_reloc, /* special_function */
169 "R_PJ_REL16", /* name */
170 false, /* partial_inplace */
171 0xffff, /* src_mask */
172 0xffff, /* dst_mask */
173 true), /* pcrel_offset */
174 EMPTY_HOWTO (4),
175 EMPTY_HOWTO (5),
176 HOWTO (R_PJ_CODE_DIR32, /* type */
177 0, /* rightshift */
178 4, /* size */
179 32, /* bitsize */
180 false, /* pc_relative */
181 0, /* bitpos */
182 complain_overflow_bitfield, /* complain_on_overflow */
183 pj_elf_reloc, /* special_function */
184 "R_PJ_CODE_DIR32", /* name */
185 true, /* partial_inplace */
186 0xffffffff, /* src_mask */
187 0xffffffff, /* dst_mask */
188 false), /* pcrel_offset */
189
190 EMPTY_HOWTO (7),
191 EMPTY_HOWTO (8),
192 EMPTY_HOWTO (9),
193 EMPTY_HOWTO (10),
194 EMPTY_HOWTO (11),
195 EMPTY_HOWTO (12),
196
197 HOWTO (R_PJ_CODE_LO16, /* type */
198 0, /* rightshift */
199 2, /* size */
200 16, /* bitsize */
201 false, /* pc_relative */
202 0, /* bitpos */
203 complain_overflow_unsigned, /* complain_on_overflow */
204 pj_elf_reloc, /* special_function */
205 "R_PJ_LO16", /* name */
206 false, /* partial_inplace */
207 0xffff, /* src_mask */
208 0xffff, /* dst_mask */
209 true), /* pcrel_offset */
210
211 HOWTO (R_PJ_CODE_HI16, /* type */
212 16, /* rightshift */
213 2, /* size */
214 16, /* bitsize */
215 false, /* pc_relative */
216 0, /* bitpos */
217 complain_overflow_unsigned, /* complain_on_overflow */
218 pj_elf_reloc, /* special_function */
219 "R_PJ_HI16", /* name */
220 false, /* partial_inplace */
221 0xffff, /* src_mask */
222 0xffff, /* dst_mask */
223 true), /* pcrel_offset */
224
225 /* GNU extension to record C++ vtable hierarchy. */
226 HOWTO (R_PJ_GNU_VTINHERIT, /* type */
227 0, /* rightshift */
228 4, /* size */
229 0, /* bitsize */
230 false, /* pc_relative */
231 0, /* bitpos */
232 complain_overflow_dont, /* complain_on_overflow */
233 NULL, /* special_function */
234 "R_PJ_GNU_VTINHERIT", /* name */
235 false, /* partial_inplace */
236 0, /* src_mask */
237 0, /* dst_mask */
238 false), /* pcrel_offset */
239
240 /* GNU extension to record C++ vtable member usage. */
241 HOWTO (R_PJ_GNU_VTENTRY, /* type */
242 0, /* rightshift */
243 4, /* size */
244 0, /* bitsize */
245 false, /* pc_relative */
246 0, /* bitpos */
247 complain_overflow_dont, /* complain_on_overflow */
248 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
249 "R_PJ_GNU_VTENTRY", /* name */
250 false, /* partial_inplace */
251 0, /* src_mask */
252 0, /* dst_mask */
253 false), /* pcrel_offset */
254 };
255
256 /* This structure is used to map BFD reloc codes to PJ ELF relocs. */
257
258 struct elf_reloc_map
259 {
260 bfd_reloc_code_real_type bfd_reloc_val;
261 unsigned char elf_reloc_val;
262 };
263
264 /* An array mapping BFD reloc codes to PJ ELF relocs. */
265
266 static const struct elf_reloc_map pj_reloc_map[] =
267 {
268 { BFD_RELOC_NONE, R_PJ_NONE },
269 { BFD_RELOC_32, R_PJ_DATA_DIR32 },
270 { BFD_RELOC_PJ_CODE_DIR16, R_PJ_CODE_DIR16 },
271 { BFD_RELOC_PJ_CODE_DIR32, R_PJ_CODE_DIR32 },
272 { BFD_RELOC_PJ_CODE_LO16, R_PJ_CODE_LO16 },
273 { BFD_RELOC_PJ_CODE_HI16, R_PJ_CODE_HI16 },
274 { BFD_RELOC_PJ_CODE_REL32, R_PJ_CODE_REL32 },
275 { BFD_RELOC_PJ_CODE_REL16, R_PJ_CODE_REL16 },
276 { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
277 { BFD_RELOC_VTABLE_ENTRY, R_PJ_GNU_VTENTRY },
278 };
279
280 /* Given a BFD reloc code, return the howto structure for the
281 corresponding PJ ELf reloc. */
282
283 static reloc_howto_type *
284 pj_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
285 bfd_reloc_code_real_type code)
286 {
287 unsigned int i;
288
289 for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
290 if (pj_reloc_map[i].bfd_reloc_val == code)
291 return & pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
292
293 return NULL;
294 }
295
296 static reloc_howto_type *
297 pj_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
298 const char *r_name)
299 {
300 unsigned int i;
301
302 for (i = 0;
303 i < sizeof (pj_elf_howto_table) / sizeof (pj_elf_howto_table[0]);
304 i++)
305 if (pj_elf_howto_table[i].name != NULL
306 && strcasecmp (pj_elf_howto_table[i].name, r_name) == 0)
307 return &pj_elf_howto_table[i];
308
309 return NULL;
310 }
311
312 /* Given an ELF reloc, fill in the howto field of a relent. */
313
314 static bool
315 pj_elf_info_to_howto (bfd *abfd,
316 arelent *cache_ptr,
317 Elf_Internal_Rela *dst)
318 {
319 unsigned int r;
320
321 r = ELF32_R_TYPE (dst->r_info);
322
323 if (r >= R_PJ_max)
324 {
325 /* xgettext:c-format */
326 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
327 abfd, r);
328 bfd_set_error (bfd_error_bad_value);
329 return false;
330 }
331
332 cache_ptr->howto = &pj_elf_howto_table[r];
333 return true;
334 }
335
336 /* Take this moment to fill in the special picoJava bits in the
337 e_flags field. */
338
339 static bool
340 pj_elf_final_write_processing (bfd *abfd)
341 {
342 elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
343 elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
344 return _bfd_elf_final_write_processing (abfd);
345 }
346
347 #define TARGET_BIG_SYM pj_elf32_vec
348 #define TARGET_BIG_NAME "elf32-pj"
349 #define TARGET_LITTLE_SYM pj_elf32_le_vec
350 #define TARGET_LITTLE_NAME "elf32-pjl"
351 #define ELF_ARCH bfd_arch_pj
352 #define ELF_MACHINE_CODE EM_PJ
353 #define ELF_MACHINE_ALT1 EM_PJ_OLD
354 #define ELF_MAXPAGESIZE 0x1000
355 #define bfd_elf32_bfd_get_relocated_section_contents \
356 bfd_generic_get_relocated_section_contents
357 #define bfd_elf32_bfd_reloc_type_lookup pj_elf_reloc_type_lookup
358 #define bfd_elf32_bfd_reloc_name_lookup pj_elf_reloc_name_lookup
359 #define elf_backend_final_write_processing pj_elf_final_write_processing
360 #define elf_info_to_howto pj_elf_info_to_howto
361 #include "elf32-target.h"