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7b4ae824 | 1 | /* Freescale S12Z-specific support for 32-bit ELF |
82704155 | 2 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
7b4ae824 JD |
3 | (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.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 | ||
28 | #include "elf/s12z.h" | |
29 | ||
30 | /* Relocation functions. */ | |
31 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup | |
32 | (bfd *, bfd_reloc_code_real_type); | |
33 | static bfd_boolean s12z_info_to_howto_rel | |
34 | (bfd *, arelent *, Elf_Internal_Rela *); | |
35 | ||
4e57b456 JD |
36 | static bfd_reloc_status_type |
37 | opru18_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol, | |
38 | void *data, asection *input_section ATTRIBUTE_UNUSED, | |
39 | bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED) | |
40 | { | |
41 | /* This reloc is used for 18 bit General Operand Addressing Postbyte in the | |
42 | INST opru18 form. This is an 18 bit reloc, but the most significant bit | |
43 | is shifted one place to the left of where it would normally be. See | |
44 | Appendix A.4 of the S12Z reference manual. */ | |
45 | ||
46 | bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd); | |
47 | bfd_vma result = bfd_get_24 (abfd, (unsigned char *) data + octets); | |
48 | bfd_vma val = bfd_asymbol_value (symbol); | |
49 | ||
50 | /* Keep the wanted bits and discard the rest. */ | |
51 | result &= 0xFA0000; | |
52 | ||
53 | val += symbol->section->output_section->vma; | |
54 | val += symbol->section->output_offset; | |
55 | ||
56 | /* The lowest 17 bits are copied verbatim. */ | |
57 | result |= val & 0x1FFFF; | |
58 | ||
59 | /* The 18th bit is put into the 19th position. */ | |
60 | result |= (val & 0x020000) << 1; | |
61 | ||
62 | bfd_put_24 (abfd, result, (unsigned char *) data + octets); | |
63 | ||
64 | return bfd_reloc_ok; | |
65 | } | |
66 | ||
67 | ||
7b4ae824 JD |
68 | static bfd_reloc_status_type |
69 | shift_addend_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol ATTRIBUTE_UNUSED, | |
70 | void *data ATTRIBUTE_UNUSED, asection *input_section ATTRIBUTE_UNUSED, | |
71 | bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED) | |
72 | { | |
73 | /* This is a really peculiar reloc, which is done for compatibility | |
74 | with the Freescale toolchain. | |
75 | ||
76 | That toolchain appears to (ab)use the lowest 15 bits of the addend for | |
77 | the purpose of holding flags. The purpose of these flags are unknown. | |
78 | So in this function, when writing the bfd we left shift the addend by | |
79 | 15, and when reading we right shift it by 15 (discarding the lower bits). | |
80 | ||
81 | This allows the linker to work with object files generated by Freescale, | |
82 | as well as by Gas. */ | |
83 | ||
84 | if (abfd->is_linker_input) | |
85 | reloc_entry->addend >>= 15; | |
86 | else | |
87 | reloc_entry->addend <<= 15; | |
88 | ||
89 | return bfd_reloc_continue; | |
90 | } | |
91 | ||
92 | #define USE_REL 0 | |
93 | ||
94 | static reloc_howto_type elf_s12z_howto_table[] = | |
95 | { | |
96 | /* This reloc does nothing. */ | |
97 | HOWTO (R_S12Z_NONE, /* type */ | |
98 | 0, /* rightshift */ | |
99 | 3, /* size (0 = byte, 1 = short, 2 = long) */ | |
100 | 0, /* bitsize */ | |
101 | FALSE, /* pc_relative */ | |
102 | 0, /* bitpos */ | |
103 | complain_overflow_dont,/* complain_on_overflow */ | |
104 | bfd_elf_generic_reloc, /* special_function */ | |
105 | "R_S12Z_NONE", /* name */ | |
106 | FALSE, /* partial_inplace */ | |
107 | 0, /* src_mask */ | |
108 | 0, /* dst_mask */ | |
109 | FALSE), /* pcrel_offset */ | |
110 | ||
111 | /* A 24 bit absolute relocation emitted by the OPR mode operands */ | |
112 | HOWTO (R_S12Z_OPR, /* type */ | |
113 | 0, /* rightshift */ | |
114 | 5, /* size (0 = byte, 1 = short, 2 = long) */ | |
115 | 24, /* bitsize */ | |
116 | FALSE, /* pc_relative */ | |
117 | 0, /* bitpos */ | |
118 | complain_overflow_bitfield, /* complain_on_overflow */ | |
119 | shift_addend_reloc, | |
120 | "R_S12Z_OPR", /* name */ | |
121 | FALSE, /* partial_inplace */ | |
d5dcaf1b | 122 | 0x00ffffff, /* src_mask */ |
7b4ae824 JD |
123 | 0x00ffffff, /* dst_mask */ |
124 | FALSE), /* pcrel_offset */ | |
125 | ||
126 | /* The purpose of this reloc is not known */ | |
127 | HOWTO (R_S12Z_UKNWN_2, /* type */ | |
128 | 0, /* rightshift */ | |
129 | 3, /* size (0 = byte, 1 = short, 2 = long) */ | |
130 | 0, /* bitsize */ | |
131 | FALSE, /* pc_relative */ | |
132 | 0, /* bitpos */ | |
133 | complain_overflow_dont,/* complain_on_overflow */ | |
134 | bfd_elf_generic_reloc, /* special_function */ | |
135 | "R_S12Z_UKNWN_2", /* name */ | |
136 | FALSE, /* partial_inplace */ | |
137 | 0, /* src_mask */ | |
138 | 0, /* dst_mask */ | |
139 | FALSE), /* pcrel_offset */ | |
140 | ||
141 | /* A 15 bit PC-rel relocation */ | |
142 | HOWTO (R_S12Z_PCREL_7_15, /* type */ | |
143 | 0, /* rightshift */ | |
144 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
145 | 15, /* bitsize */ | |
146 | TRUE, /* pc_relative */ | |
147 | 0, /* bitpos */ | |
148 | complain_overflow_bitfield, /* complain_on_overflow */ | |
149 | shift_addend_reloc, | |
150 | "R_S12Z_PCREL_7_15", /* name */ | |
151 | FALSE, /* partial_inplace */ | |
152 | 0x00, /* src_mask */ | |
153 | 0x007fff, /* dst_mask */ | |
154 | TRUE), /* pcrel_offset */ | |
155 | ||
156 | /* A 24 bit absolute relocation emitted by EXT24 mode operands */ | |
157 | HOWTO (R_S12Z_EXT24, /* type */ | |
158 | 0, /* rightshift */ | |
159 | 5, /* size (0 = byte, 1 = short, 2 = long) */ | |
160 | 24, /* bitsize */ | |
161 | FALSE, /* pc_relative */ | |
162 | 0, /* bitpos */ | |
163 | complain_overflow_bitfield, /* complain_on_overflow */ | |
164 | bfd_elf_generic_reloc, /* special_function */ | |
165 | "R_S12Z_EXT24", /* name */ | |
166 | FALSE, /* partial_inplace */ | |
808325d2 | 167 | 0x00000000, /* src_mask */ |
7b4ae824 JD |
168 | 0x00ffffff, /* dst_mask */ |
169 | FALSE), /* pcrel_offset */ | |
170 | ||
4e57b456 JD |
171 | /* An 18 bit absolute relocation */ |
172 | HOWTO (R_S12Z_EXT18, /* type */ | |
7b4ae824 | 173 | 0, /* rightshift */ |
4e57b456 JD |
174 | 5, /* size (0 = byte, 1 = short, 2 = long) */ |
175 | 18, /* bitsize */ | |
7b4ae824 JD |
176 | FALSE, /* pc_relative */ |
177 | 0, /* bitpos */ | |
4e57b456 JD |
178 | complain_overflow_bitfield, /* complain_on_overflow */ |
179 | opru18_reloc, /* special_function */ | |
180 | "R_S12Z_EXT18", /* name */ | |
7b4ae824 | 181 | FALSE, /* partial_inplace */ |
808325d2 | 182 | 0x00000000, /* src_mask */ |
4e57b456 | 183 | 0x0005ffff, /* dst_mask */ |
7b4ae824 JD |
184 | FALSE), /* pcrel_offset */ |
185 | ||
2849d19f JD |
186 | /* A 32 bit absolute relocation. This kind of relocation is |
187 | schizophrenic - Although they appear in sections named .rela.debug.* | |
188 | in some sections they behave as RELA relocs, but in others they have | |
189 | an added of zero and behave as REL. | |
190 | ||
191 | It is not recommended that new code emits this reloc. It is here | |
192 | only to support existing elf files generated by third party | |
193 | applications. */ | |
194 | ||
195 | HOWTO (R_S12Z_CW32, /* type */ | |
196 | 0, /* rightshift */ | |
197 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
198 | 32, /* bitsize */ | |
199 | FALSE, /* pc_relative */ | |
200 | 0, /* bitpos */ | |
201 | complain_overflow_bitfield, /* complain_on_overflow */ | |
202 | bfd_elf_generic_reloc, /* special_function */ | |
203 | "R_S12Z_CW32", /* name */ | |
204 | FALSE, /* partial_inplace */ | |
205 | 0xffffffff, /* src_mask */ | |
206 | 0xffffffff, /* dst_mask */ | |
207 | FALSE), /* pcrel_offset */ | |
208 | ||
7b4ae824 JD |
209 | /* A 32 bit absolute relocation */ |
210 | HOWTO (R_S12Z_EXT32, /* type */ | |
211 | 0, /* rightshift */ | |
212 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
213 | 32, /* bitsize */ | |
214 | FALSE, /* pc_relative */ | |
215 | 0, /* bitpos */ | |
216 | complain_overflow_bitfield, /* complain_on_overflow */ | |
217 | bfd_elf_generic_reloc, /* special_function */ | |
218 | "R_S12Z_EXT32", /* name */ | |
219 | FALSE, /* partial_inplace */ | |
808325d2 | 220 | 0x00000000, /* src_mask */ |
7b4ae824 JD |
221 | 0xffffffff, /* dst_mask */ |
222 | FALSE), /* pcrel_offset */ | |
223 | }; | |
224 | ||
225 | /* Map BFD reloc types to S12Z ELF reloc types. */ | |
226 | ||
227 | struct s12z_reloc_map | |
228 | { | |
229 | bfd_reloc_code_real_type bfd_reloc_val; | |
230 | unsigned char elf_reloc_val; | |
231 | }; | |
232 | ||
233 | static const struct s12z_reloc_map s12z_reloc_map[] = | |
234 | { | |
d5dcaf1b JD |
235 | /* bfd reloc val */ /* elf reloc val */ |
236 | {BFD_RELOC_NONE, R_S12Z_NONE}, | |
237 | {BFD_RELOC_32, R_S12Z_EXT32}, | |
238 | {BFD_RELOC_24, R_S12Z_EXT24}, | |
239 | {BFD_RELOC_16_PCREL, R_S12Z_PCREL_7_15}, | |
240 | {BFD_RELOC_S12Z_OPR, R_S12Z_OPR} | |
7b4ae824 JD |
241 | }; |
242 | ||
243 | static reloc_howto_type * | |
244 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
245 | bfd_reloc_code_real_type code) | |
246 | { | |
247 | unsigned int i; | |
248 | ||
249 | for (i = 0; | |
250 | i < sizeof (s12z_reloc_map) / sizeof (struct s12z_reloc_map); | |
251 | i++) | |
252 | { | |
253 | if (s12z_reloc_map[i].bfd_reloc_val == code) | |
254 | { | |
255 | return &elf_s12z_howto_table[s12z_reloc_map[i].elf_reloc_val]; | |
256 | } | |
257 | } | |
258 | ||
259 | printf ("%s:%d Not found type %d\n", __FILE__, __LINE__, code); | |
260 | ||
261 | return NULL; | |
262 | } | |
263 | ||
264 | static reloc_howto_type * | |
265 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
266 | const char *r_name) | |
267 | { | |
268 | unsigned int i; | |
269 | ||
7b4ae824 JD |
270 | for (i = 0; |
271 | i < (sizeof (elf_s12z_howto_table) | |
272 | / sizeof (elf_s12z_howto_table[0])); | |
273 | i++) | |
274 | if (elf_s12z_howto_table[i].name != NULL | |
275 | && strcasecmp (elf_s12z_howto_table[i].name, r_name) == 0) | |
276 | return &elf_s12z_howto_table[i]; | |
277 | ||
278 | return NULL; | |
279 | } | |
280 | ||
281 | /* Set the howto pointer for an S12Z ELF reloc. */ | |
282 | ||
283 | static bfd_boolean | |
284 | s12z_info_to_howto_rel (bfd *abfd, | |
285 | arelent *cache_ptr, Elf_Internal_Rela *dst) | |
286 | { | |
287 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); | |
288 | ||
289 | if (r_type >= (unsigned int) R_S12Z_max) | |
290 | { | |
291 | /* xgettext:c-format */ | |
292 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), | |
293 | abfd, r_type); | |
294 | bfd_set_error (bfd_error_bad_value); | |
295 | return FALSE; | |
296 | } | |
297 | ||
298 | cache_ptr->howto = &elf_s12z_howto_table[r_type]; | |
299 | return TRUE; | |
300 | } | |
301 | ||
302 | static bfd_boolean | |
303 | s12z_elf_set_mach_from_flags (bfd *abfd) | |
304 | { | |
cd4d353f | 305 | bfd_default_set_arch_mach (abfd, bfd_arch_s12z, 0); |
7b4ae824 JD |
306 | |
307 | return TRUE; | |
308 | } | |
309 | ||
310 | #define ELF_ARCH bfd_arch_s12z | |
7b4ae824 JD |
311 | #define ELF_MACHINE_CODE EM_S12Z |
312 | #define ELF_MAXPAGESIZE 0x1000 | |
313 | ||
314 | #define TARGET_BIG_SYM s12z_elf32_vec | |
315 | #define TARGET_BIG_NAME "elf32-s12z" | |
316 | ||
317 | #define elf_info_to_howto NULL | |
318 | #define elf_info_to_howto_rel s12z_info_to_howto_rel | |
319 | #define elf_backend_object_p s12z_elf_set_mach_from_flags | |
320 | #define elf_backend_final_write_processing NULL | |
321 | #define elf_backend_can_gc_sections 1 | |
322 | ||
323 | #include "elf32-target.h" |