1 /* BFD back-end for Zilog Z80 COFF binaries.
2 Copyright 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
3 Contributed by Arnold Metselaar <arnold_m@operamail.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 "libbfd.h"
25 #include "bfdlink.h"
26 #include "coff/z80.h"
27 #include "coff/internal.h"
28 #include "libcoff.h"
29
30 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
31
32 static reloc_howto_type r_imm32 =
33 HOWTO (R_IMM32, 0, 2, 32, FALSE, 0,
34 complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,
35 FALSE);
36
37 static reloc_howto_type r_imm24 =
38 HOWTO (R_IMM24, 0, 1, 24, FALSE, 0,
39 complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff,
40 FALSE);
41
42 static reloc_howto_type r_imm16 =
43 HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
44 complain_overflow_dont, 0, "r_imm16", 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_jr =
53 HOWTO (R_JR, 0, 0, 8, TRUE, 0,
54 complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
55 FALSE);
56
57 static reloc_howto_type r_off8 =
58 HOWTO (R_OFF8, 0, 0, 8, FALSE, 0,
59 complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,
60 FALSE);
61
62
63 #define BADMAG(x) Z80BADMAG(x)
64 #define Z80 1 /* Customize coffcode.h. */
65 #define __A_MAGIC_SET__
66
67 /* Code to swap in the reloc. */
68
69 #define SWAP_IN_RELOC_OFFSET H_GET_32
70 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
71
72 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
73 dst->r_stuff[0] = 'S'; \
74 dst->r_stuff[1] = 'C';
75
76 /* Code to turn a r_type into a howto ptr, uses the above howto table. */
77
78 static void
rtype2howto(arelent * internal,struct internal_reloc * dst)79 rtype2howto (arelent *internal, struct internal_reloc *dst)
80 {
81 switch (dst->r_type)
82 {
83 default:
84 abort ();
85 break;
86 case R_IMM8:
87 internal->howto = &r_imm8;
88 break;
89 case R_IMM16:
90 internal->howto = &r_imm16;
91 break;
92 case R_IMM24:
93 internal->howto = &r_imm24;
94 break;
95 case R_IMM32:
96 internal->howto = &r_imm32;
97 break;
98 case R_JR:
99 internal->howto = &r_jr;
100 break;
101 case R_OFF8:
102 internal->howto = &r_off8;
103 break;
104 }
105 }
106
107 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
108
109 static reloc_howto_type *
coff_z80_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)110 coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
111 bfd_reloc_code_real_type code)
112 {
113 switch (code)
114 {
115 case BFD_RELOC_8: return & r_imm8;
116 case BFD_RELOC_16: return & r_imm16;
117 case BFD_RELOC_24: return & r_imm24;
118 case BFD_RELOC_32: return & r_imm32;
119 case BFD_RELOC_8_PCREL: return & r_jr;
120 case BFD_RELOC_Z80_DISP8: return & r_off8;
121 default: BFD_FAIL ();
122 return NULL;
123 }
124 }
125
126 static reloc_howto_type *
coff_z80_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)127 coff_z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
128 const char *r_name)
129 {
130 if (strcasecmp (r_imm8.name, r_name) == 0)
131 return &r_imm8;
132 if (strcasecmp (r_imm16.name, r_name) == 0)
133 return &r_imm16;
134 if (strcasecmp (r_imm24.name, r_name) == 0)
135 return &r_imm24;
136 if (strcasecmp (r_imm32.name, r_name) == 0)
137 return &r_imm32;
138 if (strcasecmp (r_jr.name, r_name) == 0)
139 return &r_jr;
140 if (strcasecmp (r_off8.name, r_name) == 0)
141 return &r_off8;
142
143 return NULL;
144 }
145
146 /* Perform any necessary magic to the addend in a reloc entry. */
147
148 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
149 cache_ptr->addend = ext_reloc.r_offset;
150
151 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
152 reloc_processing(relent, reloc, symbols, abfd, section)
153
154 static void
reloc_processing(arelent * relent,struct internal_reloc * reloc,asymbol ** symbols,bfd * abfd,asection * section)155 reloc_processing (arelent *relent,
156 struct internal_reloc *reloc,
157 asymbol **symbols,
158 bfd *abfd,
159 asection *section)
160 {
161 relent->address = reloc->r_vaddr;
162 rtype2howto (relent, reloc);
163
164 if (reloc->r_symndx > 0)
165 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
166 else
167 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
168
169 relent->addend = reloc->r_offset;
170 relent->address -= section->vma;
171 }
172
173 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)174 extra_case (bfd *in_abfd,
175 struct bfd_link_info *link_info,
176 struct bfd_link_order *link_order,
177 arelent *reloc,
178 bfd_byte *data,
179 unsigned int *src_ptr,
180 unsigned int *dst_ptr)
181 {
182 asection * input_section = link_order->u.indirect.section;
183 int val;
184
185 switch (reloc->howto->type)
186 {
187 case R_OFF8:
188 val = bfd_coff_reloc16_get_value (reloc, link_info,
189 input_section);
190 if (val>127 || val<-128) /* Test for overflow. */
191 {
192 if (! ((*link_info->callbacks->reloc_overflow)
193 (link_info, NULL,
194 bfd_asymbol_name (*reloc->sym_ptr_ptr),
195 reloc->howto->name, reloc->addend, input_section->owner,
196 input_section, reloc->address)))
197 abort ();
198 }
199 bfd_put_8 (in_abfd, val, data + *dst_ptr);
200 (*dst_ptr) += 1;
201 (*src_ptr) += 1;
202 break;
203
204 case R_IMM8:
205 val = bfd_get_8 ( in_abfd, data+*src_ptr)
206 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
207 bfd_put_8 (in_abfd, val, data + *dst_ptr);
208 (*dst_ptr) += 1;
209 (*src_ptr) += 1;
210 break;
211
212 case R_IMM16:
213 val = bfd_get_16 ( in_abfd, data+*src_ptr)
214 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
215 bfd_put_16 (in_abfd, val, data + *dst_ptr);
216 (*dst_ptr) += 2;
217 (*src_ptr) += 2;
218 break;
219
220 case R_IMM24:
221 val = bfd_get_16 ( in_abfd, data+*src_ptr)
222 + (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)
223 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
224 bfd_put_16 (in_abfd, val, data + *dst_ptr);
225 bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
226 (*dst_ptr) += 3;
227 (*src_ptr) += 3;
228 break;
229
230 case R_IMM32:
231 val = bfd_get_32 ( in_abfd, data+*src_ptr)
232 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
233 bfd_put_32 (in_abfd, val, data + *dst_ptr);
234 (*dst_ptr) += 4;
235 (*src_ptr) += 4;
236 break;
237
238 case R_JR:
239 {
240 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
241 input_section);
242 bfd_vma dot = (*dst_ptr
243 + input_section->output_offset
244 + input_section->output_section->vma);
245 int gap = dst - dot - 1; /* -1, Since the offset is relative
246 to the value of PC after reading
247 the offset. */
248
249 if (gap >= 128 || gap < -128)
250 {
251 if (! ((*link_info->callbacks->reloc_overflow)
252 (link_info, NULL,
253 bfd_asymbol_name (*reloc->sym_ptr_ptr),
254 reloc->howto->name, reloc->addend, input_section->owner,
255 input_section, reloc->address)))
256 abort ();
257 }
258 bfd_put_8 (in_abfd, gap, data + *dst_ptr);
259 (*dst_ptr)++;
260 (*src_ptr)++;
261 break;
262 }
263
264 default:
265 abort ();
266 }
267 }
268
269 #define coff_reloc16_extra_cases extra_case
270 #define coff_bfd_reloc_type_lookup coff_z80_reloc_type_lookup
271 #define coff_bfd_reloc_name_lookup coff_z80_reloc_name_lookup
272
273 #ifndef bfd_pe_print_pdata
274 #define bfd_pe_print_pdata NULL
275 #endif
276
277 #include "coffcode.h"
278
279 #undef coff_bfd_get_relocated_section_contents
280 #define coff_bfd_get_relocated_section_contents \
281 bfd_coff_reloc16_get_relocated_section_contents
282
283 #undef coff_bfd_relax_section
284 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
285
286 CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0,
287 SEC_CODE | SEC_DATA, '\0', NULL,
288 COFF_SWAP_TABLE)
289
290