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[binutils.git] / bfd / coff-z80.c
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3c9b82ba
NC		 1/* BFD back-end for Zilog Z80 COFF binaries.
2 Copyright 2005 Free Software Foundation, Inc.
3 Contributed by Arnold Metselaar <[email protected]>
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., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22#include "bfd.h"
23#include "sysdep.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
32static reloc_howto_type r_imm32 =
33HOWTO (R_IMM32, 0, 1, 32, FALSE, 0,
34 complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,
35 FALSE);
36
134dcee5
AM		 37static reloc_howto_type r_imm24 =
38HOWTO (R_IMM24, 0, 1, 24, FALSE, 0,
39 complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff,
40 FALSE);
41
3c9b82ba
NC		 42static reloc_howto_type r_imm16 =
43HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
44 complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff,
45 FALSE);
46
47static reloc_howto_type r_imm8 =
48HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
49 complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
50 FALSE);
51
52static reloc_howto_type r_jr =
53HOWTO (R_JR, 0, 0, 8, TRUE, 0,
54 complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
55 FALSE);
56
57static reloc_howto_type r_off8 =
58HOWTO (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
78static void
79rtype2howto (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;
134dcee5
AM		 92 case R_IMM24:
93 internal->howto = &r_imm24;
94 break;
3c9b82ba
NC		 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
109static reloc_howto_type *
110coff_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;
134dcee5 117 case BFD_RELOC_24: return & r_imm24;
3c9b82ba
NC		 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/* Perform any necessary magic to the addend in a reloc entry. */
127
128#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
129 cache_ptr->addend = ext_reloc.r_offset;
130
131#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
132 reloc_processing(relent, reloc, symbols, abfd, section)
133
134static void
135reloc_processing (arelent *relent,
136 struct internal_reloc *reloc,
137 asymbol **symbols,
138 bfd *abfd,
139 asection *section)
140{
141 relent->address = reloc->r_vaddr;
142 rtype2howto (relent, reloc);
143
144 if (reloc->r_symndx > 0)
145 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
146 else
147 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
148
149 relent->addend = reloc->r_offset;
150 relent->address -= section->vma;
151}
152
153static void
154extra_case (bfd *in_abfd,
155 struct bfd_link_info *link_info,
156 struct bfd_link_order *link_order,
157 arelent *reloc,
158 bfd_byte *data,
159 unsigned int *src_ptr,
160 unsigned int *dst_ptr)
161{
162 asection * input_section = link_order->u.indirect.section;
163 int val;
164
165 switch (reloc->howto->type)
166 {
167 case R_OFF8:
168 val = bfd_coff_reloc16_get_value (reloc, link_info,
169 input_section);
170 if (val>127 || val<-128) /* Test for overflow. */
171 {
172 if (! ((*link_info->callbacks->reloc_overflow)
173 (link_info, NULL,
174 bfd_asymbol_name (*reloc->sym_ptr_ptr),
175 reloc->howto->name, reloc->addend, input_section->owner,
176 input_section, reloc->address)))
177 abort ();
178 }
179 bfd_put_8 (in_abfd, val, data + *dst_ptr);
180 (*dst_ptr) += 1;
181 (*src_ptr) += 1;
182 break;
183
184 case R_IMM8:
134dcee5 185 val = bfd_get_8 ( in_abfd, data+*src_ptr)
3c9b82ba
NC		 186 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
187 bfd_put_8 (in_abfd, val, data + *dst_ptr);
188 (*dst_ptr) += 1;
189 (*src_ptr) += 1;
190 break;
191
192 case R_IMM16:
193 val = bfd_get_16 ( in_abfd, data+*src_ptr)
194 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
195 bfd_put_16 (in_abfd, val, data + *dst_ptr);
196 (*dst_ptr) += 2;
197 (*src_ptr) += 2;
198 break;
199
134dcee5
AM		 200 case R_IMM24:
201 val = bfd_get_16 ( in_abfd, data+*src_ptr)
202 + (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)
203 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
204 bfd_put_16 (in_abfd, val, data + *dst_ptr);
205 bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
206 (*dst_ptr) += 3;
207 (*src_ptr) += 3;
208 break;
209
3c9b82ba
NC		 210 case R_IMM32:
211 val = bfd_get_32 ( in_abfd, data+*src_ptr)
212 + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
213 bfd_put_32 (in_abfd, val, data + *dst_ptr);
214 (*dst_ptr) += 4;
215 (*src_ptr) += 4;
216 break;
217
218 case R_JR:
219 {
220 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
221 input_section);
44da2da1
AM		 222 bfd_vma dot = (*dst_ptr
223 + input_section->output_offset
3c9b82ba
NC		 224 + input_section->output_section->vma);
225 int gap = dst - dot - 1; /* -1, Since the offset is relative
226 to the value of PC after reading
227 the offset. */
228
229 if (gap >= 128 || gap < -128)
230 {
231 if (! ((*link_info->callbacks->reloc_overflow)
232 (link_info, NULL,
233 bfd_asymbol_name (*reloc->sym_ptr_ptr),
234 reloc->howto->name, reloc->addend, input_section->owner,
235 input_section, reloc->address)))
236 abort ();
237 }
238 bfd_put_8 (in_abfd, gap, data + *dst_ptr);
239 (*dst_ptr)++;
240 (*src_ptr)++;
241 break;
242 }
243
244 default:
245 abort ();
246 }
247}
248
249#define coff_reloc16_extra_cases extra_case
250#define coff_bfd_reloc_type_lookup coff_z80_reloc_type_lookup
251
252#include "coffcode.h"
253
254#undef coff_bfd_get_relocated_section_contents
255#define coff_bfd_get_relocated_section_contents \
256 bfd_coff_reloc16_get_relocated_section_contents
257
258#undef coff_bfd_relax_section
259#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
260
261CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL,
262 COFF_SWAP_TABLE)
263
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