1 /* BFD back-end for Zilog Z800n COFF binaries.
2 Copyright 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005 Free Software Foundation, Inc.
4 Contributed by Cygnus Support.
5 Written by Steve Chamberlain, <sac@cygnus.com>.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "bfdlink.h"
27 #include "coff/z8k.h"
28 #include "coff/internal.h"
29 #include "libcoff.h"
30
31 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
32
33 static reloc_howto_type r_imm32 =
34 HOWTO (R_IMM32, 0, 2, 32, FALSE, 0,
35 complain_overflow_bitfield, 0, "r_imm32", TRUE, 0xffffffff,
36 0xffffffff, FALSE);
37
38 static reloc_howto_type r_imm4l =
39 HOWTO (R_IMM4L, 0, 0, 4, FALSE, 0,
40 complain_overflow_bitfield, 0, "r_imm4l", TRUE, 0xf, 0xf, FALSE);
41
42 static reloc_howto_type r_da =
43 HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
44 complain_overflow_bitfield, 0, "r_da", TRUE, 0x0000ffff, 0x0000ffff,
45 FALSE);
46
47 static reloc_howto_type r_imm8 =
48 HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
49 complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
50 FALSE);
51
52 static reloc_howto_type r_rel16 =
53 HOWTO (R_REL16, 0, 1, 16, FALSE, 0,
54 complain_overflow_bitfield, 0, "r_rel16", TRUE, 0x0000ffff, 0x0000ffff,
55 TRUE);
56
57 static reloc_howto_type r_jr =
58 HOWTO (R_JR, 1, 0, 8, TRUE, 0, complain_overflow_signed, 0,
59 "r_jr", TRUE, 0xff, 0xff, TRUE);
60
61 static reloc_howto_type r_disp7 =
62 HOWTO (R_DISP7, 0, 0, 7, TRUE, 0, complain_overflow_bitfield, 0,
63 "r_disp7", TRUE, 0x7f, 0x7f, TRUE);
64
65 static reloc_howto_type r_callr =
66 HOWTO (R_CALLR, 1, 1, 12, TRUE, 0, complain_overflow_signed, 0,
67 "r_callr", TRUE, 0xfff, 0xfff, TRUE);
68
69 #define BADMAG(x) Z8KBADMAG(x)
70 #define Z8K 1 /* Customize coffcode.h. */
71 #define __A_MAGIC_SET__
72
73 /* Code to swap in the reloc. */
74 #define SWAP_IN_RELOC_OFFSET H_GET_32
75 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
76 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
77 dst->r_stuff[0] = 'S'; \
78 dst->r_stuff[1] = 'C';
79
80 /* Code to turn a r_type into a howto ptr, uses the above howto table. */
81
82 static void
rtype2howto(arelent * internal,struct internal_reloc * dst)83 rtype2howto (arelent *internal, struct internal_reloc *dst)
84 {
85 switch (dst->r_type)
86 {
87 default:
88 abort ();
89 break;
90 case R_IMM8:
91 internal->howto = &r_imm8;
92 break;
93 case R_IMM16:
94 internal->howto = &r_da;
95 break;
96 case R_JR:
97 internal->howto = &r_jr;
98 break;
99 case R_DISP7:
100 internal->howto = &r_disp7;
101 break;
102 case R_CALLR:
103 internal->howto = &r_callr;
104 break;
105 case R_REL16:
106 internal->howto = &r_rel16;
107 break;
108 case R_IMM32:
109 internal->howto = &r_imm32;
110 break;
111 case R_IMM4L:
112 internal->howto = &r_imm4l;
113 break;
114 }
115 }
116
117 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
118
119 static reloc_howto_type *
coff_z8k_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)120 coff_z8k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
121 bfd_reloc_code_real_type code)
122 {
123 switch (code)
124 {
125 case BFD_RELOC_8: return & r_imm8;
126 case BFD_RELOC_16: return & r_da;
127 case BFD_RELOC_32: return & r_imm32;
128 case BFD_RELOC_8_PCREL: return & r_jr;
129 case BFD_RELOC_16_PCREL: return & r_rel16;
130 case BFD_RELOC_Z8K_DISP7: return & r_disp7;
131 case BFD_RELOC_Z8K_CALLR: return & r_callr;
132 case BFD_RELOC_Z8K_IMM4L: return & r_imm4l;
133 default: BFD_FAIL ();
134 return 0;
135 }
136 }
137
138 /* Perform any necessary magic to the addend in a reloc entry. */
139
140 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
141 cache_ptr->addend = ext_reloc.r_offset;
142
143 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
144 reloc_processing(relent, reloc, symbols, abfd, section)
145
146 static void
reloc_processing(arelent * relent,struct internal_reloc * reloc,asymbol ** symbols,bfd * abfd,asection * section)147 reloc_processing (arelent *relent,
148 struct internal_reloc *reloc,
149 asymbol **symbols,
150 bfd *abfd,
151 asection *section)
152 {
153 relent->address = reloc->r_vaddr;
154 rtype2howto (relent, reloc);
155
156 if (reloc->r_symndx > 0)
157 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
158 else
159 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
160
161 relent->addend = reloc->r_offset;
162 relent->address -= section->vma;
163 }
164
165 static void
extra_case(bfd * in_abfd,struct bfd_link_info * link_info,struct bfd_link_order * link_order,arelent * reloc,bfd_byte * data,unsigned int * src_ptr,unsigned int * dst_ptr)166 extra_case (bfd *in_abfd,
167 struct bfd_link_info *link_info,
168 struct bfd_link_order *link_order,
169 arelent *reloc,
170 bfd_byte *data,
171 unsigned int *src_ptr,
172 unsigned int *dst_ptr)
173 {
174 asection * input_section = link_order->u.indirect.section;
175
176 switch (reloc->howto->type)
177 {
178 case R_IMM8:
179 bfd_put_8 (in_abfd,
180 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
181 data + *dst_ptr);
182 (*dst_ptr) += 1;
183 (*src_ptr) += 1;
184 break;
185
186 case R_IMM32:
187 /* If no flags are set, assume immediate value. */
188 if (! (*reloc->sym_ptr_ptr)->section->flags)
189 {
190 bfd_put_32 (in_abfd,
191 bfd_coff_reloc16_get_value (reloc, link_info,
192 input_section),
193 data + *dst_ptr);
194 }
195 else
196 {
197 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
198 input_section);
199 /* Addresses are 23 bit, and the layout of those in a 32-bit
200 value is as follows:
201 1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
202 (A - address bits, x - ignore). */
203 dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
204 bfd_put_32 (in_abfd, dst, data + *dst_ptr);
205 }
206 (*dst_ptr) += 4;
207 (*src_ptr) += 4;
208 break;
209
210 case R_IMM4L:
211 bfd_put_8 (in_abfd,
212 ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
213 | (0x0f
214 & bfd_coff_reloc16_get_value (reloc, link_info,
215 input_section))),
216 data + *dst_ptr);
217 (*dst_ptr) += 1;
218 (*src_ptr) += 1;
219 break;
220
221 case R_IMM16:
222 bfd_put_16 (in_abfd,
223 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
224 data + *dst_ptr);
225 (*dst_ptr) += 2;
226 (*src_ptr) += 2;
227 break;
228
229 case R_JR:
230 {
231 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
232 input_section);
233 bfd_vma dot = (*dst_ptr
234 + input_section->output_offset
235 + input_section->output_section->vma);
236 int gap = dst - dot - 1; /* -1, since we're in the odd byte of the
237 word and the pc's been incremented. */
238
239 if (gap & 1)
240 abort ();
241 gap /= 2;
242 if (gap > 128 || gap < -128)
243 {
244 if (! ((*link_info->callbacks->reloc_overflow)
245 (link_info, NULL,
246 bfd_asymbol_name (*reloc->sym_ptr_ptr),
247 reloc->howto->name, reloc->addend, input_section->owner,
248 input_section, reloc->address)))
249 abort ();
250 }
251 bfd_put_8 (in_abfd, gap, data + *dst_ptr);
252 (*dst_ptr)++;
253 (*src_ptr)++;
254 break;
255 }
256
257 case R_DISP7:
258 {
259 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
260 input_section);
261 bfd_vma dot = (*dst_ptr
262 + input_section->output_offset
263 + input_section->output_section->vma);
264 int gap = dst - dot - 1; /* -1, since we're in the odd byte of the
265 word and the pc's been incremented. */
266
267 if (gap & 1)
268 abort ();
269 gap /= 2;
270
271 if (gap > 0 || gap < -127)
272 {
273 if (! ((*link_info->callbacks->reloc_overflow)
274 (link_info, NULL,
275 bfd_asymbol_name (*reloc->sym_ptr_ptr),
276 reloc->howto->name, reloc->addend, input_section->owner,
277 input_section, reloc->address)))
278 abort ();
279 }
280 bfd_put_8 (in_abfd,
281 (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
282 data + *dst_ptr);
283 (*dst_ptr)++;
284 (*src_ptr)++;
285 break;
286 }
287
288 case R_CALLR:
289 {
290 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
291 input_section);
292 bfd_vma dot = (*dst_ptr
293 + input_section->output_offset
294 + input_section->output_section->vma);
295 int gap = dst - dot - 2;
296
297 if (gap & 1)
298 abort ();
299 if (gap > 4096 || gap < -4095)
300 {
301 if (! ((*link_info->callbacks->reloc_overflow)
302 (link_info, NULL,
303 bfd_asymbol_name (*reloc->sym_ptr_ptr),
304 reloc->howto->name, reloc->addend, input_section->owner,
305 input_section, reloc->address)))
306 abort ();
307 }
308 gap /= 2;
309 bfd_put_16 (in_abfd,
310 (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
311 data + *dst_ptr);
312 (*dst_ptr) += 2;
313 (*src_ptr) += 2;
314 break;
315 }
316
317 case R_REL16:
318 {
319 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
320 input_section);
321 bfd_vma dot = (*dst_ptr
322 + input_section->output_offset
323 + input_section->output_section->vma);
324 int gap = dst - dot - 2;
325
326 if (gap > 32767 || gap < -32768)
327 {
328 if (! ((*link_info->callbacks->reloc_overflow)
329 (link_info, NULL,
330 bfd_asymbol_name (*reloc->sym_ptr_ptr),
331 reloc->howto->name, reloc->addend, input_section->owner,
332 input_section, reloc->address)))
333 abort ();
334 }
335 bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
336 (*dst_ptr) += 2;
337 (*src_ptr) += 2;
338 break;
339 }
340
341 default:
342 abort ();
343 }
344 }
345
346 #define coff_reloc16_extra_cases extra_case
347 #define coff_bfd_reloc_type_lookup coff_z8k_reloc_type_lookup
348
349 #include "coffcode.h"
350
351 #undef coff_bfd_get_relocated_section_contents
352 #define coff_bfd_get_relocated_section_contents \
353 bfd_coff_reloc16_get_relocated_section_contents
354
355 #undef coff_bfd_relax_section
356 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
357
358 CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)
359